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index 0000000000000000000000000000000000000000..8033c970b456d856fdb41ae56cdddbae8d634aae --- /dev/null +++ b/parse/train/H1xipsA5K7/H1xipsA5K7.md @@ -0,0 +1,2143 @@ +# LEARNING TWO-LAYER NEURAL NETWORKS WITH SYMMETRIC INPUTS + +Rong Ge +Computer Science Department +Duke University +rongge@cs.duke.edu +Rohith Kuditipudi +Computer Science Department +Duke University +rohith.kuditipudi@duke.edu +Zhize Li +Institute for Interdisciplinary Information Sciences +Tsinghua University +zz-li14@mails.tsinghua.edu.cn +Xiang Wang +Computer Science Department +Duke University +xwang@cs.duke.edu + +# ABSTRACT + +We give a new algorithm for learning a two-layer neural network under a general class of input distributions. Assuming there is a ground-truth two-layer network + +$$ +y = A \sigma ( W x ) + \xi , +$$ + +where $A , W$ are weight matrices, $\xi$ represents noise, and the number of neurons in the hidden layer is no larger than the input or output, our algorithm is guaranteed to recover the parameters $A , W$ of the ground-truth network. The only requirement on the input $x$ is that it is symmetric, which still allows highly complicated and structured input. + +Our algorithm is based on the method-of-moments framework and extends several results in tensor decompositions. We use spectral algorithms to avoid the complicated non-convex optimization in learning neural networks. Experiments show that our algorithm can robustly learn the ground-truth neural network with a small number of samples for many symmetric input distributions. + +# 1 INTRODUCTION + +Deep neural networks have been extremely successful in many tasks related to images, videos and reinforcement learning. However, the success of deep learning is still far from being understood in theory. In particular, learning a neural network is a complicated non-convex optimization problem, which is hard in the worst-case. The question of whether we can efficiently learn a neural network still remains generally open, even when the data is drawn from a neural network. Despite a lot of recent effort, the class of neural networks that we know how to provably learn in polynomial time is still very limited, and many results require strong assumptions on the input distribution. + +In this paper we design a new algorithm that is capable of learning a two-layer1 neural network for a general class of input distributions. Following standard models for learning neural networks, we assume there is a ground truth neural network. The input data $( x , y )$ is generated by first sampling the input $x$ from an input distribution $\mathcal { D }$ , then computing $y$ according to the ground truth network that is unknown to the learner. The learning algorithm will try to find a neural network $f$ such that $f ( x )$ is as close to $y$ as possible over the input distribution $\mathcal { D }$ . Learning a neural network is known to be a hard problem even in some simple settings (Goel et al., 2016; Brutzkus & Globerson, 2017), so we need to make assumptions on the network structure or the input distribution $\mathcal { D }$ , or both. Many works have worked with a simple input distribution (such as Gaussians) and try to learn more and more complex networks (Tian, 2017; Brutzkus & Globerson, 2017; Li & Yuan, 2017; Soltanolkotabi, 2017; Zhong et al., 2017). However, the input distributions in real life are distributions of very complicated objects such as texts, images or videos. These inputs are highly structured, clearly not Gaussian and do not even have a simple generative model. + +We consider a type of two-layer neural network, where the output $y$ is generated as + +$$ +y = A \sigma ( W x ) + \xi . +$$ + +Here $x \in \mathbb { R } ^ { d }$ is the input, $W \in \mathbb { R } ^ { k \times d }$ and $A \in \mathbb { R } ^ { k \times k }$ are two weight matrices2. The function $\sigma$ is the standard ReLU activation function $\sigma ( x ) = \operatorname* { m a x } \{ x , 0 \}$ applied entry-wise to the vector $W x$ , and $\xi$ is a noise vector that has $\mathbb { E } [ \xi ] = 0$ and is independent of $x$ . Although the network only has two layers, learning similar networks is far from trivial: even when the input distribution is Gaussian, Ge et al. (2017b) and Safran & Shamir (2018) showed that standard optimization objective can have bad local optimal solutions. Ge et al. (2017b) gave a new and more complicated objective function that does not have bad local minima. + +For the input distribution $\mathcal { D }$ , our only requirement is that $\mathcal { D }$ is symmetric. That is, for any $x \in \mathbb { R } ^ { d }$ , the probability of observing $x \sim \mathcal { D }$ is the same as the probability of observing $- x \sim \mathcal { D }$ . A symmetric distribution can still be very complicated and cannot be represented by a finite number of parameters. In practice, one can often think of the symmetry requirement as a “factor- $2 ^ { \circ }$ approximation to an arbitrary input distribution: if we have arbitrary training samples, it is possible to augment the input data with their negations to make the input distribution symmetric, and it should take at most twice the effort in labeling both the original and augmented data. In many cases (such as images) the augmented data can be interpreted (for images it will just be negated colors) so reasonable labels can be obtained. + +# 1.1 OUR RESULTS + +When the input distribution is symmetric, we give the first algorithm that can learn a two-layer neural network. Our algorithm is based on the method-of-moments approach: first estimate some correlations between $x$ and $y$ , then use these information to recover the model parameters. More precisely we have + +Theorem 1 (informal). If the data is generated according to Equation (1), and the input distribution $x \sim \mathcal { D }$ is symmetric. Given exact correlations between $x , y$ of order at most 4, as long as $A , W$ and input distribution are not degenerate, there is an algorithm that runs in $p o l y ( d )$ time and outputs a network ${ \hat { A } } , { \hat { W } }$ of the same size that is effectively the same as the ground-truth network: for any input $x$ , $\hat { A } \sigma ( \hat { W } x ) = A \sigma ( W x )$ . + +Of course, in practice we only have samples of $( x , y )$ and cannot get the exact correlations. However, our algorithm is robust to perturbations, and in particular can work with polynomially many samples. + +Theorem 2 (informal). If the data is generated according to Equation (1), and the input distribution $x \sim \mathcal { D }$ is symmetric. As long as the weight matrices $A , W$ and input distributions are not degenerate, there is an algorithm that uses poly $( d , 1 / \epsilon )$ time and number of samples and outputs a network ${ \hat { A } } , { \hat { W } }$ of the same size that computes an -approximation function to the ground-truth network: for any input $x$ , $\| \hat { A } \sigma ( \hat { W } x ) - A \sigma ( W x ) \| ^ { 2 } \leq \epsilon .$ . + +In fact, the algorithm recovers the original parameters $A , W$ up to scaling and permutations. Here when we say weight matrices are not degenerate, we mean that the matrices $A , W$ should be full rank, and in addition a certain distinguishing matrix that we define later in Section 2 is also full rank. We justify these assumptions using the smoothed analysis framework (Spielman & Teng, 2004). + +In smoothed analysis, the input is not purely controlled by an adversary. Instead, the adversary can first generate an arbitrary instance (in our case, arbitrary weight matrices $W , A$ and symmetric input distribution $\mathcal { D }$ ), and the parameters for this instance will be randomly perturbed to yield a perturbed instance. The algorithm only needs to work with high probability on the perturbed instance. This limits the power of the adversary and prevents it from creating highly degenerate cases (e.g. choosing the weight matrices to be much lower rank than $k$ ). Roughly speaking, we show + +Theorem 3 (informal). There is a simple way to perturb the input distribution, $W$ and $A$ such that with high probability, the distance between the perturbed instance and original instance is at most $\lambda ,$ , and our algorithm outputs an -approximation to the perturbed network with poly $( d , 1 / \lambda , 1 / \epsilon )$ time and number of samples. + +In the rest of the paper, we will first review related works. Then in Section 2 we formally define the network and introduce some notations. Our algorithm is given in Section 3. Finally in Section 4 we run experiments to show that the algorithm can indeed learn the two-layer network efficiently and robustly. The experiments show that our algorithm works robustly with reasonable number of samples for different (symmetric) input distributions and weight matrices. Due to space constraints, the proof for polynomial number of samples (Theorem 2) and smoothed analysis (Theorem 3) are deferred to the appendix. + +# 1.2 RELATED WORK + +There are many works in learning neural networks, and they come in many different styles. + +Non-standard Networks Some works focus on networks that do not use standard activation functions. Arora et al. (2014) gave an algorithm that learns a network with discrete variables. Livni et al. (2014) and follow-up works learn neural networks with polynomial activation functions. Oymak & Soltanolkotabi (2018) used the rank-1 tensor decomposition for learning a non-overlapping convolutional neural network with differentiable and smooth activation and Gaussian input. + +ReLU network, Gaussian input When the input is Gaussian, Ge et al. (2017b) showed that for a two-layer neural network, although the standard objective does have bad local optimal solutions, one can construct a new objective whose local optima are all globally optimal. Several other works (Tian, 2017; Du et al., 2017b; Brutzkus & Globerson, 2017; Li & Yuan, 2017; Soltanolkotabi, 2017; Zhong et al., 2017; Zhang et al., 2018) extend this to different settings. + +General input with score functions A closely related work (Janzamin et al., 2015) does not require the input distribution to be Gaussian, but still relies on knowing the score function of the input distribution (which in general cannot be estimated efficiently from samples). Recently, Gao et al. (2018) gave a way to design loss functions with desired properties for one-hidden-layer neural networks with general input distributions based on a new proposed local likelihood score function estimator. For general distributions (including symmetric ones) their estimator can still require number of samples that is exponential in dimension $d$ (as in Assumption 1(d)). + +General input distributions There are several lines of work that try to extend the learning results to more general distributions. Du et al. (2017a) showed how to learn a single neuron or a single convolutional filter under some conditions for the input distribution. Daniely et al. (2016); Zhang et al. (2016; 2017); Goel & Klivans (2017); Du & Goel (2018) used kernel methods to learn neural networks when the norm of the weights and input distributions are both bounded (and in general the running time and sample complexity in this line of work depend exponentially on the norms of weights/input). Recently, Du et al. (2018) showed that gradient descent minimizes the training error in an over-parameterized two-layer neural network. They only consider training error while our results also apply to testing error. The work that is most similar to our setting is Goel et al. (2018), where they showed how to learn a single neuron (or a single convolutional filter) for any symmetric input distribution. Our two-layer neural network model is much more complicated. + +Method-of-Moments and Tensor Decomposition Our work uses method-of-moments, which has already been applied to learn many latent variable models (see Anandkumar et al. (2014) and references there). The particular algorithm that we use is inspired by an over-complete tensor decomposition algorithm FOOBI (De Lathauwer et al., 2007). Our smoothed analysis results are inspired by Bhaskara et al. (2014) and Ma et al. (2016), although our setting is more complicated and we need several new ideas. + +# 2 PRELIMINARIES + +In this section, we first describe the neural network model that we learn, and then introduce notations related to matrices and tensors. Finally we will define distinguishing matrix, which is a central object in our analysis. + +# 2.1 NETWORK MODEL + +We consider two-layer neural networks with $d$ -dimensional input, $k$ hidden units and $k$ -dimensional output, as shown in Figure 1. We assume that $k \leq d$ . The input of the neural network is denoted by $\mathbf { \bar { \Phi } } _ { x } \in \mathbb { R } ^ { d }$ . Assume that the input $x$ is i.i.d. drawn from a symmetric distribution $\mathcal { D } ^ { 3 }$ . Let the two weight matrices in the neural network be $W \in \mathbb { R } ^ { k \times d }$ and $\mathbf { \bar { A } } \in \mathbb { R } ^ { k \times k }$ . The output $\boldsymbol { y } \in \mathbb { R } ^ { k }$ is generated as follows: + +$$ +y = A \sigma ( W x ) + \xi , +$$ + +where $\sigma ( \cdot )$ is the element-wise ReLU function and $\xi \in \mathbb { R } ^ { k }$ is zero-mean random noise, which is independent with input $x$ . Let the value of hidden units be $\boldsymbol { h } \in \mathbb { R } ^ { k }$ , which is equal to $\sigma ( W x )$ . Denote $i$ -th row of matrix $W$ as $\boldsymbol { w _ { i } ^ { \intercal } }$ $( i = 1 , 2 , . . . , k )$ . Also, let $i$ -th column of matrix $A$ be $a _ { i }$ $( i = 1 , 2 , . . . , k )$ . By property of ReLU activations, for any constant $c > 0$ , scaling the $i$ -th row of $W$ by $c$ while scaling the $i$ -th column of $A$ by $1 / c$ does not change the function computed by the network. Therefore without loss of generality, we assume every row vector of $W$ has unit norm. + +$$ +\begin{array} { r l } & { \quad \displaystyle \sum _ { j = \pm \infty } \sum _ { s = \pm 1 } ^ { \infty } y = A h + \xi } \\ & { \quad \displaystyle \sum _ { j = \pm \infty } \sum _ { w _ { 1 } ^ { \intercal } \big ( \frac { \partial } { \partial \omega _ { 2 } ^ { \intercal } } , \therefore \cdot \cdot \cdot w _ { k } ^ { \intercal } \big ( \frac { \partial } { \partial \omega } \big ) \big ) \ } A = \mathbb { R } ^ { k \times k } } \\ & { \quad \quad \displaystyle \sum _ { j = \pm \infty } \sum _ { s = \pm \pm \infty } \mathbb { W } \in \mathbb { R } ^ { k \times d } } \\ & { \quad \quad \quad \displaystyle \sum _ { j = \pm \pm \infty } \mathbb { 1 } _ { \substack { \left( \frac { \partial } { \partial \omega _ { 2 } ^ { \intercal } } \cdot \cdot \cdot \cdot \cdot \right) \big ( \frac { \partial } { \partial \omega _ { 1 } ^ { \intercal } } \circ \mathcal { D } \big ) \ } } x = \mathbb { 1 } _ { \AA } } \end{array} +$$ + +Figure 1: Network model. + +# 2.2 NOTATIONS + +We use $[ n ]$ to denote the set $\{ 1 , 2 , \cdots , n \}$ . For two random variables $X$ and $Y$ , we say $X \ { \overset { d } { = } } \ Y$ if they come from the same distribution. + +In the vector space $\mathbb { R } ^ { n }$ , we use $\langle \cdot , \cdot \rangle$ to denote the inner product of two vectors, and use $\| \cdot \|$ to denote the Euclidean norm. We use $e _ { i }$ to denote the $i$ -th standard basis vector. For a matrix $A \in \mathbb { R } ^ { m \times n }$ , let $A _ { [ i , : ] }$ denote its $i$ -th row vector, and let $A _ { [ : , j ] }$ denote its $j$ -th column vector. Let $A$ ’s singular values be $\ddot { \sigma _ { 1 } } ( A ) \geq \sigma _ { 2 } ( A ) \geq \cdot \cdot \cdot \geq \sigma _ { \operatorname* { m i n } ( m , n ) } ( \stackrel { \cdot } { A } )$ , and denote the smallest singular value be $\sigma _ { \mathrm { m i n } } ( A ) =$ $\sigma _ { \mathrm { m i n } ( m , n ) } ( A )$ . The condition number of matrix $A$ is defined as $\kappa ( A ) : = \sigma _ { 1 } ( A ) / \sigma _ { \mathrm { m i n } } ( A )$ . We use $I _ { n }$ to denote the identity matrix with dimension $n \times n$ . The spectral norm of a matrix is denoted as $\| \cdot \|$ , and the Frobenius norm as $\| \cdot \| _ { F }$ . + +We represent a $d$ -dimensional linear subspace $s$ by a matrix $S \in \mathbb { R } ^ { n \times d }$ , whose columns form an orthonormal basis for subspace $s$ . The projection matrix onto the subspace $s$ is denoted by $\mathrm { P r o j } _ { S } = S S ^ { \top }$ , and the projection matrix onto the orthogonal subspace of $s$ is denoted by $\mathrm { P r o j } _ { S ^ { \perp } } =$ $I _ { n } - S S ^ { \top }$ . + +For matrix $A \ \in \ \mathbb { R } ^ { m _ { 1 } \times n _ { 1 } } , C \ \in \ R ^ { m _ { 2 } \times n _ { 2 } }$ , let the Kronecker product of $A$ and $C$ be $A \otimes C \in$ $\mathbb { R } ^ { m _ { 1 } m _ { 2 } \times n _ { 1 } n _ { 2 } }$ , which is defined as $( A \otimes C ) _ { ( i _ { 1 } , i _ { 2 } ) , ( j _ { 2 } , j _ { 2 } ) } = A _ { i _ { 1 } , i _ { 2 } } C _ { j _ { 1 } , j _ { 2 } }$ . For a vector $x \in \mathbb { R } ^ { d }$ , the Kronecker product $x \otimes x$ has dimension $d ^ { 2 }$ . We denote the $p$ -fold Kronecker product of $x$ as $x ^ { \otimes p }$ , which has dimension $d ^ { p }$ . + +We often need to convert between vectors and matrices. For a matrix $A \in \mathbb { R } ^ { m \times n }$ , let $\operatorname { v e c } ( A ) \in \mathbb { R } ^ { m n }$ be the vector obtained by stacking all the columns of $A$ . For a vector $a \in \mathbb { R } ^ { m ^ { 2 } }$ , let $\mathrm { m a t } ( x ) \ \in$ $\mathbb { R } ^ { m \times m }$ denote the inverse mapping such that vec $( \operatorname* { m a t } ( a ) ) = a$ . Let $\mathbb { R } _ { s y m } ^ { k \times k }$ be the space of all $k \times k$ symmetric matrices, which has dimension ${ \binom { k } { 2 } } + k$ . For convenience, we denote $k _ { 2 } = { \binom { k } { 2 } }$ . For a symmetric matrix $B \in \mathbb { R } _ { s y m } ^ { k \times k }$ , we denote $\mathrm { v e c } ^ { * } ( B ) \in \mathbb { R } ^ { k _ { 2 } + k }$ as the vector obtained by stacking all the upper triangular entries (including diagonal entries) of $B$ . Note that $\mathrm { v e c } ( B )$ still has dimension $k ^ { 2 }$ . For a vector $b \in \mathbb { R } ^ { k _ { 2 } + k }$ , let $\mathrm { m a t } ^ { - } ( b ) \ \bar { \in } \ \mathbb { R } _ { s y m } ^ { k \times k }$ denote the inverse mapping of $\mathrm { v e c } ^ { * } ( \cdot )$ such that $\mathrm { v e c } ^ { * } ( \mathrm { m a t } ^ { * } ( B ) ) = b$ . + +# 2.3 DISTINGUISHING MATRIX + +A central object in our analysis is a large matrix whose columns are closely related to pairs of hidden variables. We call this the distinguishing matrix and define it below: + +Definition 1. Given a weight matrix $W$ of the first layer, and the input distribution $\mathcal { D }$ , the distinguishing matrix $N ^ { \mathcal { D } } \in \mathbb { R } ^ { d ^ { 2 } \times k _ { 2 } }$ is a matrix whose columns are indexed by $i j$ where $1 \leq i < j \leq k$ and + +$$ +N _ { i j } ^ { D } = \mathbb { E } _ { x \sim \mathcal { D } } \left[ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \right] . +$$ + +Another related concept is the augmented distinguishing matrix $M$ , which is a $d ^ { 2 } \times ( k _ { 2 } + 1 )$ matrix whose first $k _ { 2 }$ columns are exactly the same as distinguishing matrix $N$ , and the last column (indexed by 0) is defined as + +$$ +M _ { 0 } ^ { D } = \mathbb { E } _ { x \sim { D } } [ x \otimes x ] . +$$ + +For both matrices, when the input distribution is clear from context we use $N$ or $M$ and omit the superscript. + +The exact reason for these definitions will only be clear after we explain the algorithm in Section 3. Our algorithm will require that these matrices are robustly full rank, in the sense that $\sigma _ { m i n } ( M )$ is lowerbounded. Intuitively, every column $N _ { i j } ^ { \mathcal { D } }$ looks at the expectation over samples that have opposite signs for weights $w _ { i } , w _ { j }$ $( w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq \bar { 0 }$ , hence the name distinguishing matrix). + +Requiring $M$ and $N$ to be full rank prevents several degenerate cases. For example, if two hidden units are perfectly correlated and always share the same sign for every input, this is very unnatural and requiring the distinguishing matrix to be full rank prevents such cases. Later in Section C we will also show that requiring a lowerbound on $\sigma _ { m i n } ( M )$ is not unreasonable: in the smoothed analysis setting where the nature can make a small perturbation on the input distribution $\mathcal { D }$ , we show that for any input distribution $\mathcal { D }$ , there exists simple perturbations $\mathcal { D } ^ { \prime }$ that are arbitrarily close to $\mathcal { D }$ such that $\sigma _ { m i n } ( M ^ { D ^ { \prime } } )$ is lowerbounded. + +# 3 OUR ALGORITHM + +In this section, we describe our algorithm for learning the two-layer networks defined in Section 2.1. As a warm-up, we will first consider a single-layer neural network and recover the results in Goel et al. (2018) using method-of-moments. This will also be used as a crucial step in our algorithm. Due to space constraints we will only introduce algorithm and proof ideas, the detailed proof is deferred to Section A in appendix. Throughout this section, when we use $\mathbb { E } [ \cdot ]$ without further specification the expectation is over the randomness $x \sim \mathcal { D }$ and the noise $\xi$ . + +# 3.1 WARM-UP: LEARNING SINGLE-LAYER NETWORKS + +We will first give a simple algorithm for learning a single-layer neural network. More precisely, suppose we are given samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ where $x _ { i } \sim \mathcal { D }$ comes from a symmetric distribution, and the output $y _ { i }$ is computed by + +$$ +y _ { i } = \sigma ( w ^ { \top } x _ { i } ) + \xi _ { i } . +$$ + +Here $\xi _ { i }$ ’s are i.i.d. noises that satisfy $\mathbb { E } [ \xi _ { i } ] = 0$ . Noise $\xi _ { i }$ is also assumed to be independent with input $x _ { i }$ . The goal is to learn the weight vector $w$ . + +The idea of the algorithm is simple: we will estimate the correlations between $x$ and $y$ and the covariance of $x$ , and then recover the hidden vector $w$ using these two estimates. The main challenge here is that $y$ is not a linear function on $x$ . Goel et al. (2018) gave a crucial observation that allows us to deal with the non-linearity: + +# Algorithm 1 Learning Single-layer Neural Networks + +Input: Samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ generated according to Equation (3). Output: Estimate of weight vector $w$ . +1: Estimate $\begin{array} { r } { v = \frac { 1 } { n } \sum _ { i = 1 } ^ { n } y _ { i } x _ { i } } \end{array}$ +2: Estimate $\begin{array} { r } { C = \frac { 1 } { n } \sum _ { i = 1 } ^ { n } x _ { i } x _ { i } ^ { \top } } \end{array}$ +3: return $2 C ^ { - 1 } v$ . + +Lemma 1. Suppose $x \sim \mathcal { D }$ comes from a symmetric distribution and $y$ is computed as in (3), then + +$$ +\mathbb { E } [ y x ] = \frac { 1 } { 2 } \mathbb { E } [ x x ^ { \top } ] w . +$$ + +Importantly, the right hand side of Lemma 1 does not contain the ReLU function $\sigma$ . This is true because if $x$ comes from a symmetric distribution, averaging between $x$ and $- x$ can get rid of nonlinearities like ReLU or leaky-ReLU. Later we will prove a more general version of this lemma (Lemma 6). + +Using this lemma, it is immediate to get a method-of-moments algorithm for learning $w$ : we just need to estimate $\mathbb { E } [ y x ]$ and $\mathbb { E } [ x x ^ { \top } ]$ , then we know $\boldsymbol { w } = 2 ( \mathbb { E } [ \boldsymbol { x } \boldsymbol { x } ^ { \top } ] ) ^ { \top 1 } \mathbb { E } [ \boldsymbol { y } \boldsymbol { x } ]$ . This is summarized in Algorithm 1. + +# 3.2 LEARNING TWO-LAYER NETWORKS + +In order to learn the weights of the network defined in Section 2.1, a crucial observation is that we have $k$ outputs as well as $k$ hidden-units. This gives a possible way to reduce the two-layer problem to the single-layer problem. For simplicity, we will consider the noiseless case in this section, where + +$$ +y = A \sigma ( W x ) . +$$ + +Let $u \in \mathbb { R } ^ { k }$ be a vector and consider $u ^ { \top } y$ , it is clear that $u ^ { \top } y = ( u ^ { \top } A ) \sigma ( \underline { { W } } x )$ . Let $z _ { i }$ be the normalized version $i$ -th row of $A ^ { - 1 }$ , then we know $z _ { i }$ has the property that $\dot { z } _ { i } ^ { \top } A = \lambda _ { i } e _ { i } ^ { \top }$ where $\lambda _ { i } > 0$ is a constant and $e _ { i }$ is a basis vector. + +The key observation here is that if $u = z _ { i }$ , then $u ^ { \top } A = \lambda _ { i } e _ { i } ^ { \top }$ . As a result, $u ^ { \top } y = \lambda _ { i } e _ { i } ^ { \top } \sigma ( W x ) =$ $\sigma ( \lambda _ { i } w _ { i } ^ { \top } x )$ is the output of a single-layer neural network with weight equal to $\lambda _ { i } w _ { i }$ . If we know all the vectors $\{ z _ { 1 } , . . . , z _ { k } \}$ , the input/output pairs $( x , z _ { i } ^ { \top } y )$ correspond to single-layer networks with weight vectors $\{ \lambda _ { i } w _ { i } \}$ . We can then apply the algorithm in Section 3.1 (or the algorithm in Goel et al. (2018)) to learn the weight vectors. + +When $u ^ { \top } A = \lambda _ { i } e _ { i }$ , we say that $u ^ { \top } y$ is a pure neuron. Next we will design an algorithm that can find all vectors $\left\{ z _ { i } \right\}$ ’s that generate pure neurons, and therefore reduce the problem of learning a two-layer network to learning a single-layer network. + +Pure Neuron Detector In order to find the vector $u$ that generates a pure neuron, we will try to find some property that is true if and only if the output can be represented by a single neuron. + +Intuitively, using ideas similar to Lemma 1 we can get a property that holds for all pure neurons: + +Lemma 2. Suppose $\boldsymbol { \hat { y } } = \sigma ( \boldsymbol { w } ^ { \top } \boldsymbol { x } )$ , then $\begin{array} { r } { \mathbb { E } [ \hat { y } ^ { 2 } ] = \frac { 1 } { 2 } w ^ { \top } \mathbb { E } [ x x ^ { \top } ] w , } \end{array}$ , and $\begin{array} { r } { \mathbb { E } [ \hat { y } x ] = \frac { 1 } { 2 } \mathbb { E } [ x x ^ { \top } ] w } \end{array}$ . As $a$ result we have + +$$ +\mathbb { E } [ \hat { y } ^ { 2 } ] = 2 \mathbb { E } [ \hat { y } x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { y } x ] . +$$ + +As before, the ReLU activation does not appear because of the symmetric input distribution. For $\hat { y } = u ^ { \top } y$ , we can estimate all of these moments $( \mathbb { E } [ \hat { y } ^ { 2 } ] , \mathbb { E } [ \hat { y } x ^ { \top } ] , \bar { \mathbb { E } } [ x x ^ { \top } ] )$ using samples and check whether this condition is satisfied. However, the problem with this property is that even if $z = u ^ { \top } y$ is not pure, it may still satisfy the property. More precisely, if $\begin{array} { r } { \hat { y } = \sum _ { i = 1 } ^ { k } c _ { i } \sigma ( w _ { i } ^ { \top } x ) } \end{array}$ , then we have + +$$ +2 \mathbb { E } [ \hat { y } x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { y } x ] - \mathbb { E } [ \hat { y } ^ { 2 } ] = \sum _ { 1 \leq i < j \leq k } c _ { i } c _ { j } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] +$$ + +The additional terms may accidentally cancel each other which leads to a false positive. To address this problem, we consider a higher order moment: + +Lemma 3. Suppose $\boldsymbol { \hat { y } } = \sigma ( \boldsymbol { w } ^ { \top } \boldsymbol { x } )$ , then + +$$ +\begin{array} { r } { \mathbb { E } [ \hat { y } ^ { 2 } ( x \otimes x ) ] = 2 \mathbb { E } \left[ \hat { y } \cdot ( \mathbb { E } [ \hat { y } x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \right] . } \end{array} +$$ + +Moreover, if $\begin{array} { r } { \hat { y } = \sum _ { i = 1 } ^ { k } c _ { i } \sigma ( w _ { i } ^ { \top } x ) } \end{array}$ where $c \in \mathbb { R } ^ { k }$ is a $k$ -dimensional vector, we have + +$$ +2 \mathbb { E } \left[ \hat { y } \cdot ( \mathbb { E } [ \hat { y } x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \right] - \mathbb { E } [ \hat { y } ^ { 2 } ( x \otimes x ) ] = \sum _ { 1 \leq i < j \leq k } c _ { i } c _ { j } N _ { i j } . +$$ + +Here $N _ { i j }$ ’s are columns of the distinguishing matrix defined in Definition $I$ + +The important observation here is that there are $\begin{array} { r l r } { k _ { 2 } } & { { } \ = \ } & { \left( \begin{array} { c } { k } \\ { 2 } \end{array} \right) } \end{array}$ extra terms in $2 \mathbb { E } \left[ \hat { y } \cdot ( \mathbb { E } [ \hat { y } x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \right] - \mathbb { E } [ \hat { y } ^ { 2 } ( x \otimes x ) ]$ that are multiples of $N _ { i j }$ , which are $d ^ { 2 }$ (or $\binom { d + 1 } { 2 }$ considering their symmetry) dimensional objects. When the distinguishing matrix is full rank, we know its columns $N _ { i j }$ are linearly independent. In that case, if the sum of the extra terms is 0, then the coefficient in front of each $N _ { i j }$ must also be 0. The coefficients are $c _ { i } c _ { j }$ which will be non-zero if and only if both $c _ { i } , c _ { j }$ are non-zero, therefore to make all the coefficients 0 at most one of $\left\{ c _ { i } \right\}$ can be non-zero. This is summarized in the following Corollary: + +Corollary 1 (Pure Neuron Detector). Define $\begin{array} { r } { f ( u ) : = 2 \mathbb { E } \left[ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \right] } \end{array}$ $- \mathbb { E } [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) ]$ . Suppose the distinguishing matrix is full rank, if $\dot { f } ( u ) = 0$ for unit vector $u$ , then u must be equal to one of $\pm z _ { i }$ . + +We will call the function $f ( u )$ a pure neuron detector, as $u ^ { \top } y$ is a pure neuron if and only if $f ( u ) =$ 0. Therefore, to finish the algorithm we just need to find all solutions for $f ( u ) = 0$ . + +Linearization The main obstacle in solving the system of equations $f ( u ) = 0$ is that every entry of $f ( u )$ is a quadratic function in $u$ . The system of equations $f ( u ) = 0$ is therefore a system of quadratic equations. Solving a generic system of quadratic equations is NP-hard. However, in our case this can be solved by a technique that is very similar to the FOOBI algorithm for tensor decomposition (De Lathauwer et al., 2007). The key idea is to linearize the function by thinking of each degree 2 monomial $u _ { i } u _ { j }$ as a separate variable. Now the number of variables is $k _ { 2 } + k = { \binom { k } { 2 } } + k$ and $f$ is linear in this space. In other words, there exists a matrix $T \in \mathbb { R } ^ { d ^ { 2 } \times ( k _ { 2 } + k ) }$ such that $T \mathrm { v e c } ^ { * } ( u u _ { - } ^ { \top } ) = f ( u )$ . Clearly, if $u ^ { \top } y$ is a pure neuron, then $T \mathrm { v e c } ^ { * } ( u u ^ { \top } ) = f ( u ) = 0$ . That is, $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ are all in the nullspace of $T$ . Later in Section A we will prove that the nullspace of $T$ consists of exactly these vectors (and their combinations): + +Lemma 4. Let $T$ be the unique $\mathbb { R } ^ { d ^ { 2 } \times ( k _ { 2 } + k ) }$ matrix that satisfies $T \nu e c ^ { * } ( u u ^ { \top } ) = f ( u )$ (where $f ( u )$ is defined as in Corollary $I$ ), suppose the distinguishing matrix is full rank, then the nullspace of $T$ is exactly the span of $\{ \nu e c ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ . + +Based on Lemma 4, we can just estimate the tensor $T$ from the samples we are given, and its smallest singular directions would give us the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ . + +Finding $z _ { i }$ ’s from span of $z _ { i } z _ { i } ^ { \top }$ ’s In order to reduce the problem to a single-layer problem, the final step is to find $z _ { i }$ ’s from span of $z _ { i } z _ { i } ^ { \top }$ ’s. This is also a step that has appeared in FOOBI and more generally other tensor decomposition algorithms, and can be solved by a simultaneous diagonalization. Let $Z$ be the matrix whose rows are $z _ { i }$ ’s, which means $Z = \mathrm { d i a g } ( \lambda ) A ^ { - 1 }$ . Let $X = \breve { Z } ^ { \top } D _ { X } Z$ and $Y = Z ^ { \top } D _ { Y } Z$ be two random elements in the span of $z _ { i } z _ { i } ^ { \top }$ , where $D _ { X }$ and $D _ { Y }$ are two random diagonal matrices. Both matrices $X$ and $Y$ can be diagonalized by matrix $Z$ . In this case, if we compute $X Y ^ { - 1 } = Z ^ { \top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \top } ) ^ { - 1 }$ , since $z _ { i }$ is a column of $Z ^ { \dagger }$ , we know + +$$ +X Y ^ { - 1 } z _ { i } = Z ^ { \top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \top } ) ^ { - 1 } z _ { i } = Z ^ { \top } D _ { X } D _ { Y } ^ { - 1 } e _ { i } = \frac { D _ { X } ( i , i ) } { D _ { Y } ( i , i ) } Z ^ { \top } e _ { i } = \frac { D _ { X } ( i , i ) } { D _ { Y } ( i , i ) } z _ { i } . +$$ + +That is, $z _ { i }$ is an eigenvector of $X Y ^ { - 1 }$ ! The matrix $X Y ^ { - 1 }$ can have at most $k$ eigenvectors and there are $k z _ { i }$ ’s, therefore the $z _ { i }$ ’s are the only eigenvectors of $X Y ^ { - 1 }$ . + +Lemma 5. Given the span of $z _ { i } z _ { i } ^ { \top } \mathbf { \Sigma } ^ { \prime } s ,$ , let $X , Y$ be two random matrices in this span, with probability 1 the $z _ { i }$ ’s are the only eigenvectors of $X Y ^ { - 1 }$ . + +Using this procedure we can find all the $z _ { i }$ ’s (up to permutations and sign flip). Without loss of generality we assume $z _ { i } ^ { \top } A = \lambda _ { i } e _ { i } ^ { \top }$ . The only remaining problem is that $\lambda _ { i }$ might be negative. However, this is easily fixable by checking $\mathbb { E } [ z _ { i } ^ { \top } y ] ~ = ~ \lambda _ { i } \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ]$ . Since $\sigma ( w _ { i } ^ { \top } x )$ is always nonnegative, $\mathbb { E } [ z _ { i } ^ { \top } y ]$ has the same sign as $\lambda _ { i }$ , and we can flip $z _ { i }$ if $\mathbb { E } [ z _ { i } ^ { \top } y ]$ is negative. + +# 3.3 DETAILED ALGORITHM AND GUARANTEES + +We can now give the full algorithm, see Algorithm 2. The main steps of this algorithm is as explained in the previous section. Steps $2 \cdot 5$ constructs the pure neuron detector and finds the span of $\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ (as in Corollary 1); Steps 7 - 9 performs simultaneous diagonalization to get all the $z _ { i }$ ’s; Steps 11, 12 calls Algorithm 1 to solve the single-layer problem and outputs the correct result. + +# Algorithm 2 Learning Two-layer Neural Networks + +
Output: Weight matrices W_and A.Input: Samples (x1, y1),.,(xn, yn) generated according to Equation (4)
1: {Finding span of vec(zizT)’s}
2: Estimate empirical moments E[xxT],E[yxT],E[yx@3] and E[y y (x x)].
3: Compute the vector f(u) = 2E[(uTy).(E[(uTy)xT]E[xxT]-1x)·(xx)]-E[(uTy)²(x凶x)]
where each entry is expressed as a degree-2 polynomial over u.
4:: Construct matrix T ∈ Rd²×(k2+k) such that,Tvec*(uuT) = f(u).
5:Compute the k-least right singular vectors of T,denoted by vec*(U1), vec*(U2),.: , vec*(Uk). Let S be a k2 + k by k matrix, where the i-th column of S is vector vec*(Ui). {Here span S is
equal to span of {vec*(ziz𝑖)}.} 6:{Finding zi's from span}
7: Let X = mat*(SSi), Y = mat*(SS2), where S1 and S2 are two independently sampled k-
8:dimensional standard Gaussian vectors. :Let z1,.,zk be eigenvectors of XY-1.
9:For each zi,ifE[zTy] <O let zi ← -zi. {Here zi's are normalized rows of A-1.}
10:{Reduce to 1-Layer Problem}
11:For each zi,let Ui be the output of Algorithm 1 with input (x1,zi y1),., (xn, zi yn).
13:return V,Z-1.12: Let Z be the matrix whose rows are zT's, V be the matrix whose rows are vi 's.
+ +We are now ready to state a formal version of Theorem 1: + +Theorem 4. Suppose $A , W , \mathbb { E } [ x x ^ { \top } ]$ and the distinguishing matrix $N$ are all full rank, and Algorithm 2 has access to the exact moments, then the network returned by the algorithm computes exactly the same function as the original neural network. + +It is easy to prove this theorem using the lemmas we have. + +Proof. By Corollary 1, we know that after Step 5 of Algorithm 2, the span of columns of $S$ is exactly equal to the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ . By Lemma 5, we know the eigenvectors of $X Y ^ { - 1 }$ at Step 8 are exactly the normalized version of rows of $A ^ { - 1 }$ . Without loss of generality, we will fix the permutation and assume $z _ { i } ^ { \top } A = \lambda _ { i } e _ { i } ^ { \top }$ . In Step 9, we use the fact that $\mathbb { E } [ \breve { z } _ { i } ^ { \top } y ] = \bar { \lambda } _ { i } \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ]$ where $\mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ]$ is always positive because $\sigma$ is the ReLU function. Therefore, after Step 9 we can assume all the $\lambda _ { i }$ ’s are positive. + +Now the output $z _ { i } ^ { \top } y = \lambda _ { i } \sigma ( w _ { i } ^ { \top } x ) = \sigma ( \lambda _ { i } w _ { i } ^ { \top } x )$ (again by property of ReLU function $\sigma$ ), by the design of Algorithm 1 we know $v _ { i } = \lambda _ { i } w _ { i }$ . We also know that $\dot { Z } = \mathrm { d i a g } ( \lambda ) A ^ { - 1 }$ , therefore $Z ^ { - 1 } = \mathbf { \bar { \Phi } } _ { A \mathrm { d i a g } ( \bar { \lambda } ) ^ { - 1 } }$ . Notice that $Z ^ { - 1 } \sigma ( V x ) = { \cal A } \mathrm { d i a g } ( \lambda ) ^ { - 1 } \sigma ( \mathrm { d i a g } ( \lambda ) W x ) = { \cal A } \sigma ( W x )$ . These two scaling factors cancel each other, so the two networks compute the same function. □ + +![](images/bce1a966c2b20fa3aaf7fab0d0f73ff12c645bb513acc44d71dbecde7a947667.jpg) +Figure 2: Error in recovering $W$ , $A$ and outputs (“MSE”) for different numbers of training samples and different dimensions of $W$ and $A$ . Each point is the result of averaging across five trials, where on the left $W$ and $A$ are both drawn as random $1 0 \times 1 0$ orthonormal matrices and in the center as $3 2 \times 3 2$ orthonormal matrices. On the right, given 10, 000 training samples we plot the square root of the algorithm’s error normalized by the dimension of $W$ and $A$ , which are again drawn as random orthonormal matrices. The input distribution is a spherical Gaussian. + +# 4 EXPERIMENTS + +In this section, we provide experimental results to validate the robustness of our algorithm for both Gaussian input distributions as well as more general symmetric distributions such as symmetric mixtures of Gaussians. + +There are two important ways in which our implementation differs from our description in Section 3.3. First, our description of the simultaneous diagonalization step in our algorithm is mostly for simplicity of both stating and proving the algorithm. In practice we find it is more robust to draw $1 0 k$ random samples from the subspace spanned by the last $k$ right-singular vectors of $T$ and compute the CP decomposition of all the samples (reshaped as matrices and stacked together as a tensor) via alternating least squares (Comon et al., 2009). As alternating least squares can also be unstable we repeat this step 10 times and select the best one. Second, once we have recovered and fixed $A$ we use gradient descent to learn $W$ , which compared to Algorithm 1 does a better job of ensuring the overall error will not explode even if there is significant error in recovering $A$ . Crucially, these modifications are not necessary when the number of samples is large enough. For example, given 10,000 input samples drawn from a spherical Gaussian and $A$ and $W$ drawn as random $1 0 \times 1 0$ orthogonal matrices, our implementation of the original formulation of the algorithm was still able to recover both $A$ and $W$ with an average error of approximately 0.15 and achieve close to zero mean square error across 10 random trials. + +# 4.1 SAMPLE EFFICIENCY + +First we show that our algorithm does not require a large number of samples when the matrices are not degenerate. In particular, we generate random orthonormal matrices $A$ and $W$ as the ground truth, and use our algorithm to learn the neural network. As illustrated by Figure 2, regardless of the size of $W$ and $A$ our algorithm is able to recover both weight matrices with minimal error so long as the number of samples is a few times of the number of parameters. To measure the error in recovering $A$ and $W$ , we first normalize the columns of $A$ and rows of $W$ for both our learned parameters and the ground truth, pair corresponding columns and rows together, and then compute the squared distance between learned and ground truth parameters. Note in the rightmost plot of Figure 2, in order to compare the performance between different dimensions, we further normalize the recovering error by the dimension of $W$ and $A$ . It shows that the squared root of normalized error remains stable as the dimension of $A$ and $W$ grows from 10 to 32. In Figure 2, we also show the overall mean square error–averaged over all output units–achieved by our learned parameters. + +# 4.2 ROBUSTNESS TO NOISE + +Figure 3 demonstrates the robustness of our algorithm to label noise $\xi$ for Gaussian and symmetric mixture of Gaussians input distributions. In this experiment, we fix the size of both $A$ and $W$ to be $1 0 \times 1 0$ and again generate both parameters as random orthonormal matrices. The overall mean square error achieved by our algorithm grows almost perfectly in step with the amount of label noise, indicating that our algorithm recovers the globally optimal solution regardless of the choice of input distribution. + +![](images/cf79ccb6d55715961b9e37658eb5eab234c33717028790496de2c2959003240e.jpg) +Figure 3: Error in recovering $W$ , $A$ and outputs (“MSE”) for different amounts of label noise. Each point is the result of averaging across five trials with 10,000 training samples, where for each trial $W$ and $A$ are both drawn as $1 0 \times 1 0$ orthonormal matrices. The input distribution on the left is a spherical Gaussian and on the right a mixture of two Gaussians with one component based at the all-ones vector and the other component at its reflection. + +![](images/43f46ddd59f652644244a5b20ed0b078d2f0b5e6c24659cfcd1904cadc331817.jpg) +Figure 4: Error in recovering $W$ , $A$ and outputs (“MSE”), on the left for different levels of conditioning of $W$ and on the right for $A$ . Each point is the result of averaging across five trials with 20,000 training samples, where for each trial one parameter is drawn as a random orthonormal matrix while the other as described in Section 4.3. The input distribution is a mixture of Gaussians with two components, one based at the all-ones vector and the other at its reflection. + +# 4.3 ROBUSTNESS TO CONDITION NUMBER + +We’ve already shown that our algorithm continues to perform well across a range of input distributions and even when $A$ and $W$ are high-dimensional. In all previous experiments however, we sampled $A$ and $W$ as random orthonormal matrices so as to control for their conditioning. In this experiment, we take the input distribution to be a random symmetric mixture of two Gaussians and vary the condition number of either $A$ or $W$ by sampling singular value decompositions $U { \boldsymbol { \Sigma } } V ^ { \top }$ such that $U$ and $V$ are random orthonormal matrices and $\bar { \Sigma _ { i i } } = \mathbf { \bar { \Sigma } } ^ { - i }$ , where $\lambda$ is chosen based on the desired condition number. Figure 4 respectively demonstrate that the performance of our algorithm remains steady so long as $A$ and $W$ are reasonably well-conditioned before eventually fluctuating. Moreover, even with these fluctuations the algorithm still recovers $A$ and $W$ with sufficient accuracy to keep the overall mean square error low. + +# 5 CONCLUSION + +Optimizing the parameters of a neural network is a difficult problem, especially since the objective function depends on the input distribution which is often unknown and can be very complicated. In this paper, we design a new algorithm using method-of-moments and spectral techniques to avoid the complicated non-convex optimization for neural networks. Our algorithm can learn a network that is of similar complexity as the previous works, while allowing much more general input distributions. + +There are still many open problems. The current result requires output to have the same (or higher) dimension than the hidden layer, and the hidden layer does not have a bias term. Removing these constraints are are immediate directions for future work. Besides the obvious ones of extending our results to more general distributions and more complicated networks, we are also interested in the relations to optimization landscape for neural networks. In particular, our algorithm shows there is a way to find the global optimal network in polynomial time, does that imply anything about the optimization landscape of the standard objective functions for learning such a neural network, or does it imply there exists an alternative objective function that does not have any local minima? We hope this work can lead to new insights for optimizing a neural network. + +# ACKNOWLEDGEMENT + +This work was supported by NSF CCF-1704656. + +# REFERENCES + +Animashree Anandkumar, Rong Ge, Daniel Hsu, Sham M Kakade, and Matus Telgarsky. 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Then we discuss how to handle the noise case (i.e. $\overset { \cdot } { \boldsymbol { y } } = \sigma ( W \boldsymbol { x } ) + \boldsymbol { \xi } )$ and give the corresponding algorithm (Algorithm 3). At the end we also briefly discuss how to handle the case when the matrix $A$ has more rows than columns (more outputs than hidden units). + +Again, throughout the section when we write $\mathbb { E } [ \cdot ]$ , the expectation is taken over the randomness of $x \sim \mathcal { D }$ and noise $\xi$ . + +# A.1 MISSING PROOFS FOR SECTION 3 + +Single-layer: To get rid of the non-linearities like ReLU, we use the property of the symmetric distribution (similar to (Goel et al., 2018)). Here we provide a more general version (Lemma 6) instead of proving the specific Lemma 1. Note that Lemma 1 is the special case when $a = w$ and $p = q = 1$ (here $\xi$ does not affect the result since it has zero mean and is independent with $x$ , thus $\mathbb { \tilde { E } } [ y x ] = \mathbb { E } [ \sigma ( w ^ { \top } x ) x ] )$ . + +Lemma 6. Suppose input $x$ comes from a symmetric distribution, for any vector $a \in \mathbb { R } ^ { d }$ and any non-negative integers $p$ and $q$ satisfying that $p + q$ is an even number, we have + +$$ +\mathbb { E } \big [ \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } x ^ { \otimes q } \big ] = \frac { 1 } { 2 } \mathbb { E } [ ( a ^ { \top } x ) ^ { p } x ^ { \otimes q } ] , +$$ + +where the expectation is taken over the input distribution. + +Proof. Since input $x$ comes from a symmetric distribution, we know that $\mathbb { E } \big [ \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } x ^ { \otimes q } \big ] \ =$ $\mathbb { E } \big [ \big ( \sigma ( - a ^ { \top } x ) \big ) ^ { p } ( - x ) ^ { \otimes q } \big ]$ . Thus, we have + +$$ +\mathbb { E } \big [ \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } x ^ { \otimes q } \big ] = \frac { 1 } { 2 } \Big ( \mathbb { E } \big [ \big ( \sigma ( - a ^ { \top } x ) \big ) ^ { p } ( - x ) ^ { \otimes q } \big ] + \mathbb { E } \big [ \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } x ^ { \otimes q } \big ] \Big ) . +$$ + +There are two cases to consider: $p$ and $q$ are both even numbers or both odd numbers. + +1. For the case where $p$ and $q$ are even numbers, we have + +$$ +\begin{array} { r l } & { \quad \frac { 1 } { 2 } \bigl ( \mathbb { E } \bigl [ \bigl ( \sigma ( - a ^ { \top } x ) \bigr ) ^ { p } ( - x ) ^ { \otimes q } \bigr ] + \mathbb { E } \bigl [ \bigl ( \sigma ( a ^ { \top } x ) \bigr ) ^ { p } x ^ { \otimes q } \bigr ] \bigr ) } \\ & { = \frac { 1 } { 2 } \bigl ( \mathbb { E } \bigl [ \bigl ( \sigma ( - a ^ { \top } x ) \bigr ) ^ { p } x ^ { \otimes q } \bigr ] + \mathbb { E } \bigl [ \bigl ( \sigma ( a ^ { \top } x ) \bigr ) ^ { p } x ^ { \otimes q } \bigr ] \bigr ) } \\ & { = \frac { 1 } { 2 } \mathbb { E } \Bigl [ \Bigl ( \bigl ( \sigma ( - a ^ { \top } x ) \bigr ) ^ { p } + \bigl ( \sigma ( a ^ { \top } x ) \bigr ) ^ { p } \Bigr ) x ^ { \otimes q } \Bigr ] . } \end{array} +$$ + +If $( a ^ { \top } x ) \leq 0$ , we kno $\operatorname { v } \left( \sigma ( - a ^ { \top } x ) \right) ^ { p } + \left( \sigma ( a ^ { \top } x ) \right) ^ { p } = ( a ^ { \top } x ) ^ { p } + 0 = ( a ^ { \top } x ) ^ { p } .$ Otherwise, we have $\left( \sigma ( - a ^ { \top } x ) \right) ^ { p } + \left( \sigma ( a ^ { \top } x ) \right) ^ { p } = 0 + ( a ^ { \top } x ) ^ { p } = ( a ^ { \top } x ) ^ { p } .$ . Thus, + +$$ +\begin{array} { r l } & { \mathbb { E } \big [ \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } x ^ { \otimes q } \big ] = \frac { 1 } { 2 } \mathbb { E } \Big [ \Big ( \big ( \sigma ( - a ^ { \top } x ) \big ) ^ { p } + \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } \Big ) x ^ { \otimes q } \Big ] } \\ & { \qquad = \frac { 1 } { 2 } \mathbb { E } [ ( a ^ { \top } x ) ^ { p } x ^ { \otimes q } ] . } \end{array} +$$ + +2. For the other case where $p$ and $q$ are odd numbers, we have + +$$ +\begin{array} { r l } & { \quad \frac { 1 } { 2 } \bigl ( \mathbb { E } \bigl [ \bigl ( \sigma ( - a ^ { \top } x ) \bigr ) ^ { p } ( - x ) ^ { \otimes q } \bigr ] + \mathbb { E } \bigl [ \bigl ( \sigma ( a ^ { \top } x ) \bigr ) ^ { p } x ^ { \otimes q } \bigr ] \bigr ) } \\ & { = \frac { 1 } { 2 } \mathbb { E } \Bigl [ \Bigl ( - \bigl ( \sigma ( - a ^ { \top } x ) \bigr ) ^ { p } + \bigl ( \sigma ( a ^ { \top } x ) \bigr ) ^ { p } \Bigr ) x ^ { \otimes q } \Bigr ] . } \end{array} +$$ + +Similarly, if $( a ^ { \top } x ) \leq 0$ , we know $- \left( \sigma ( - a ^ { \top } x ) \right) ^ { p } + \left( \sigma ( a ^ { \top } x ) \right) ^ { p } = - ( - a ^ { \top } x ) ^ { p } + 0 =$ $( a ^ { \top } x ) ^ { p }$ . Otherwise, we have $- \left( \sigma ( - a ^ { \top } x ) \right) ^ { p } + \left( \sigma ( a ^ { \top } x ) \right) ^ { p } = 0 + ( a ^ { \top } x ) ^ { p } = ( a ^ { \top } x ) ^ { p } .$ Thus, + +$$ +\begin{array} { r l } & { \mathbb { E } \big [ \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } x ^ { \otimes q } \big ] = \frac { 1 } { 2 } \mathbb { E } \Big [ \Big ( - \big ( \sigma ( - a ^ { \top } x ) \big ) ^ { p } + \big ( \sigma ( a ^ { \top } x ) \big ) ^ { p } \Big ) x ^ { \otimes q } \Big ] } \\ & { \qquad = \frac { 1 } { 2 } \mathbb { E } [ ( a ^ { \top } x ) ^ { p } x ^ { \otimes q } ] . } \end{array} +$$ + +Pure neuron detector: The first step in our algorithm is to construct a pure neuron detector based on Lemma 2 and Lemma 3. We will provide proofs for these two lemmas here. + +Proof of Lemma 2. This proof easily follows from Lemma 6. Setting $a = w$ , $p = 2$ and $q = 0$ in Lemma 6, we have $\mathbb { E } [ \hat { y } ^ { 2 } ] \stackrel { \cdot } { = } \frac { 1 } { 2 } w ^ { \top } \mathbb { E } [ \stackrel { \cdot } { x } x ^ { \top } ] w$ . Similarly, we also know $\begin{array} { r } { \mathbb E [ \hat { y } x ^ { \top } ] = \frac 1 2 w ^ { \top } \mathbb E [ x x ^ { \top } ] } \end{array}$ and $\begin{array} { r } { \mathbb { E } [ \hat { y } x ] = \frac { 1 } { 2 } \mathbb { E } [ x x ^ { \top } ] w } \end{array}$ . Thus, we have $\mathbb { E } [ \hat { y } ^ { 2 } ] = 2 \mathbb { E } [ \hat { y } x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { y } x ]$ .  + +Proof of Lemma 3. Here, we only prove the second equation, since the first equation is just a special case of the second equation. First, we rewrite $\begin{array} { r } { \hat { y } = \sum _ { i = 1 } ^ { k } c _ { i } \sigma ( w _ { i } ^ { \top } x ) = u ^ { \top } y } \end{array}$ by letting $u ^ { \top } A = c ^ { \top }$ . Then we transform these two terms in the LHS as follows. Let’s look at $\mathbb { E } [ ( u ^ { \top } y ) \cdot$ $( \mathbb { E } [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \boldsymbol { x } ^ { \top } ] \mathbb { E } [ \boldsymbol { x } \boldsymbol { x } ^ { \top } ] ^ { - 1 } \boldsymbol { x } ) \cdot ( \boldsymbol { x } \otimes \boldsymbol { x } ) \big ]$ first. For $\mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 }$ , we have + +$$ +\begin{array} { r l } & { \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } } \\ & { = \mathbb { E } \big [ ( u ^ { \top } A \sigma ( W x ) ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } } \\ & { = \frac { 1 } { 2 } u ^ { \top } A W \mathbb { E } \big [ x x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } } \\ & { = \frac { 1 } { 2 } u ^ { \top } A W } \end{array} +$$ + +For any vector $q \in \mathbb { R } ^ { d }$ , consider $2 \mathbb { E } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \cdot ( \boldsymbol { q } ^ { \top } \boldsymbol { x } ) \cdot ( \boldsymbol { x } \otimes \boldsymbol { x } ) \big ]$ . We have + +$$ +\begin{array} { r l } & { \mathrm { ~ \gamma ~ } } \\ & { \mathrm { ~ \ } } \\ & { \mathrm { = 2 \mathbb E } [ ( \boldsymbol { u } ^ { \top } \boldsymbol { A } \boldsymbol { \sigma } ( \boldsymbol { W } \boldsymbol { x } ) ) ( \boldsymbol { q } ^ { \top } \boldsymbol { x } ) ( \boldsymbol { x } \otimes \boldsymbol { x } ) ] } \\ & { \mathrm { ~ \ } } \\ & { \mathrm { = \mathbb E } \left[ ( \boldsymbol { u } ^ { \top } \boldsymbol { A } \boldsymbol { W } \boldsymbol { x } ) ( \boldsymbol { q } ^ { \top } \boldsymbol { x } ) ( \boldsymbol { x } \otimes \boldsymbol { x } ) \right] } \end{array} +$$ + +Let $\begin{array} { r } { { \boldsymbol { q } } ^ { \top } = \mathbb { E } \big [ ( { \boldsymbol { u } } ^ { \top } { \boldsymbol { y } } ) { \boldsymbol { x } } ^ { \top } \big ] \mathbb { E } \big [ { \boldsymbol { x } } { \boldsymbol { x } } ^ { \top } \big ] ^ { - 1 } = \textstyle { \frac { 1 } { 2 } } { \boldsymbol { u } } ^ { \top } { \boldsymbol { A } } { \boldsymbol { W } } } \end{array}$ , we have + +$$ +\begin{array} { r l } & { \quad 2 \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] } \\ & { = \frac { 1 } { 2 } \mathbb { E } \big [ ( u ^ { \top } A W x ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { = - \frac { 1 } { 2 } \mathbb { E } \big [ \langle A ^ { \top } u , W x \rangle ^ { 2 } ( x \otimes x ) \big ] } \\ & { = \frac { 1 } { 2 } \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u ) _ { i } ^ { 2 } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u ) _ { i } ( A ^ { \top } u ) _ { j } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \\ & { = \frac { 1 } { 2 } \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i i } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] . } \end{array} +$$ + +where the second equality holds due to Lemma 6. + +Now, let’s look at the second term $\mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ]$ . + +$$ +\begin{array} { r l } & { ~ \mathbb { E } [ ( u ^ { \prime } , y ) ^ { 2 } ( x \otimes x ) ] } \\ & { = \mathbb { E } \big [ ( u ^ { \top } A \sigma ( W x ) ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { = \mathbb { E } \big [ \langle A ^ { \top } u , \sigma ( W x ) \rangle ^ { 2 } ( x \otimes x ) \big ] } \\ & { = \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u ) _ { i } ^ { 2 } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + 2 \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u ) _ { i } ( A ^ { \top } u ) _ { j } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \\ & { = \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i i } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + 2 \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \\ & { = \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i i } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + 2 \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \\ & { = \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i i } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + 2 \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \end{array} +$$ + +Now, we subtract (5) by (6) to obtain + +$$ +\begin{array} { r l r } { { 2 \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] } } \\ & { = \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] - \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \\ & { = \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] } \\ & { = \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } N _ { i j } N _ { i j } , } & { ( 8 } \end{array} +$$ + +where (7) uses (9) of the following Lemma 7, and (8) uses the definition of distinguishing matrix $N$ (Definition 1).  + +Lemma 7. Given input x coming from a symmetric distribution, for any vector $a , b \in \mathbb { R } ^ { d }$ , we have + +$$ +\frac { 1 } { 2 } \mathbb { E } \left[ ( a ^ { \top } x ) ( b ^ { \top } x ) \right] - \mathbb { E } \left[ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \right] = \frac { 1 } { 2 } \mathbb { E } \left[ ( a ^ { \top } x ) ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x \leq 0 \} \right] +$$ + +and + +$$ +\mathbb E \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) ( x \otimes x ) \big ] - \mathbb E \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) ( x \otimes x ) \big ] = \frac 1 2 \mathbb E \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x \leq 0 \} \big ] , +$$ + +where the expectation is taken over the input distribution. + +Proof. Here we just prove the first identity, because the proof of the second one is almost identical. First, we rewrite ${ \textstyle \frac { 1 } { 2 } } \mathbb { E } { \bigl [ } ( a ^ { \top } x ) ( b ^ { \top } x ) { \bigr ] }$ as follows + +$$ +\frac { 1 } { 2 } \mathbb { E } \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) \big ] = \frac { 1 } { 2 } \mathbb { E } \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x \leq 0 \} \big ] + \frac { 1 } { 2 } \mathbb { E } \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] . +$$ + +Thus, we only need to show that $\begin{array} { r } { \frac { 1 } { 2 } \mathbb { E } \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] = \mathbb { E } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \big ] } \end{array}$ . It’s clear that $\mathbb { E } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \big ] = \mathbb { E } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] .$ + +Since input $x$ comes from a symmetric distribution, we have + +$$ +\begin{array} { r l } { \boldsymbol { \mathbb { z } } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \boldsymbol { \mathbb { 1 } } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] = \boldsymbol { \mathbb { E } } \big [ \sigma ( - a ^ { \top } x ) \sigma ( - b ^ { \top } x ) \boldsymbol { \mathbb { 1 } } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] } & { } \\ & { = \frac { 1 } { 2 } \Big ( \boldsymbol { \mathbb { E } } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \boldsymbol { \mathbb { 1 } } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] } \\ & { \quad \quad + \boldsymbol { \mathbb { E } } \big [ \sigma ( - a ^ { \top } x ) \sigma ( - b ^ { \top } x ) \boldsymbol { \mathbb { 1 } } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] \Big ) } \\ & { = \frac { 1 } { 2 } \boldsymbol { \mathbb { E } } \Big [ \big ( \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) + \sigma ( - a ^ { \top } x ) \sigma ( - b ^ { \top } x ) \big ) \boldsymbol { \mathbb { 1 } } \{ a ^ { \top } x b ^ { \top } x > 0 \} \Big ] } \\ & { = \frac { 1 } { 2 } \boldsymbol { \mathbb { E } } \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) \boldsymbol { \mathbb { 1 } } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] . } \end{array} +$$ + +When $a ^ { \top } x b ^ { \top } x > 0$ , we know $a ^ { \top } x$ and $b ^ { \top } x$ are both positive or both negative. In either case, we know that $\sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) + \sigma ( - a ^ { \top } x ) \sigma ( - b ^ { \top } x ) = ( a ^ { \top } x ) ( b ^ { \top } x )$ . Thus, we have + +$$ +\begin{array} { r } { \mathbb { E } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \big ] = \mathbb { E } \big [ \sigma ( a ^ { \top } x ) \sigma ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] } \\ { = \frac { 1 } { 2 } \mathbb { E } \big [ ( a ^ { \top } x ) ( b ^ { \top } x ) \mathbb { 1 } \{ a ^ { \top } x b ^ { \top } x > 0 \} \big ] , } \end{array} +$$ + +which finished our proof. + +Finding span: Now, we find the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ . First, we recall that $\begin{array} { r } { f ( u ) = 2 \mathbb { E } \bigl [ ( u ^ { \top } y ) } \end{array}$ $( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ]$ . Then, according to (8), we have + +$$ +\mathbf { \Psi } ^ { * } ( u ) = 2 \mathbb { E } \left[ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \right] - \mathbb { E } \left[ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \right] = \sum _ { \substack { 1 \leq i < j \leq k } } ( A ^ { \top } u u ^ { \top } A ) _ { i j } N _ { i } +$$ + +It is not hard to verify that $u ^ { \top } y$ is a pure neuron if and only if $f ( u ) = 0$ . Note that $f ( u ) = 0$ is a system of quadratic equations. So we linearize it by increasing the dimension (i.e., consider $u _ { i } u _ { j }$ as a single variable) similar to the FOOBI algorithm. Thus the number of variable is $\textstyle { \binom { k } { 2 } } + k = k _ { 2 } + k _ { \ O }$ , i.e., + +$$ +\exists T \in \mathbb { R } ^ { d ^ { 2 } \times ( k _ { 2 } + k ) } \mathrm { ~ s u c h ~ t h a t ~ } T \mathrm { v e c } ^ { * } ( U ) = f ( U ) = \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } U A ) _ { i j } N _ { i j } . +$$ + +Now, we prove the Lemma 4 which shows the null space of $T$ is exactly the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ . + +Proof of Lemma 4. We divide the proof to the following two cases: + +1. For any vector vec $^ * ( U )$ belongs to the null space of $T$ , we have $T \mathrm { v e c } ^ { * } ( U ) = 0$ . Note that the RHS of (10) equals to 0 if and only if $A ^ { \top } { \bar { U } } A$ is a diagonal matrix since the distinguishing matrix $N$ is full column rank and $A ^ { \top } U A$ is symmetric. Thus ${ \mathrm { v e c } } ^ { * } ( U )$ belongs to the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ since $U = Z ^ { \top } D Z$ for some diagonal matrix $D$ . + +2. For any vector ${ \mathrm { v e c } } ^ { * } ( U )$ belonging to the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ , $U$ is a linear combination of $z _ { i } z _ { i } ^ { \dagger }$ ’s. Furthermore, $T \mathrm { v e c } ^ { * } ( U )$ is a linear combination of $\tilde { T } \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ . Note that $A ^ { \top } z _ { i }$ only has one non-zero entry due to the definition of $z _ { i }$ , for any $i \in [ k ]$ . Thus all coefficients in the RHS of (10) are 0. We get $T \mathrm { v e c } ^ { * } ( U ) = 0$ . + +Finding $z _ { i }$ ’s: Now, we prove the final Lemma 5 which finds all $z _ { i }$ ’s from the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ by using simultaneous diagonalization. Given all $z _ { i }$ ’s, this two-layer network can be reduced to a single-layer one. Then one can use Algorithm 1 to recover the first layer parameters $w _ { i }$ ’s. + +Proof of Lemma 5. As we discussed before this lemma, we have $X Y ^ { - 1 } = Z ^ { \top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \top } ) ^ { - 1 }$ . According to the following Lemma 8 (i.e., all diagonal elements of $D _ { x } D _ { y } ^ { - 1 }$ are non-zero and distinct), the matrix $X Y ^ { - 1 }$ have $k$ eigenvectors and there are $k z _ { i }$ ’s, therefore $z _ { i }$ ’s are the only eigenvectors of $X Y ^ { - 1 }$ .  + +Lemma 8. With probability 1, all diagonal elements of $D _ { X }$ and $D _ { Y }$ are non-zero and all diagonal elements of $D _ { X } \dot { D } _ { Y } ^ { - 1 }$ are distinct, where $X = Z ^ { \top } D _ { X } \bar { Z }$ and $Y = Z ^ { \top } D _ { Y } Z$ are defined in Line 7 of Algorithm 2. + +Proof. First, we know there exist diagonal matrices $\{ D _ { i } : i \in [ k ] \}$ such that m $\mathsf { a t } ^ { * } ( \mathsf { v e c } ^ { * } ( U _ { i } ) ) =$ $Z ^ { \top } \dot { D } _ { i } Z$ for all $i \in [ k ]$ , where $\{ \mathrm { v e c } ^ { * } ( U _ { i } ) : i \in [ k ] \}$ are the $k$ -least right singular vectors of $T$ (see Line 5 of Algorithm 2). Then, let the vector $\bar { d } _ { i } \in \mathbb { R } ^ { k }$ be the diagonal elements of $D _ { i }$ , for all $i \in k$ . Let matrix $Q \in \mathbb { R } ^ { k \times k }$ be a matrix where its $i$ -th column is $d _ { i }$ . Then $D _ { X } = \mathrm { d i a g } ( Q \zeta _ { 1 } ) $ and $D _ { Y } = \mathrm { d i a g } ( Q \zeta _ { 2 } )$ , where $\zeta _ { 1 }$ and $\zeta _ { 2 }$ are two random $k$ -dimensional standard Gaussian vectors (see Line 7 of Algorithm 2). + +Since $\{ \mathrm { v e c } ^ { * } ( U _ { i } ) : i \in [ k ] \}$ are singular vectors of $T$ , we know $d _ { 1 } , d _ { 2 } , \cdots , d _ { k }$ are independent. Thus, $Q$ has full rank and none of its rows are zero vectors. Let $i$ -th row of $Q$ be $q _ { i } ^ { \top }$ . Let’s consider $D _ { X }$ first. In order for $i$ -th diagonal element of $D _ { X }$ to be zero, we need $q _ { i } ^ { \top } \zeta _ { 1 } = 0$ . Since $q _ { i }$ is not a zero vector, we know the solution space of $q _ { i } \zeta _ { 1 } = 0$ is a lower-dimension manifold in $\mathbb { R } ^ { k }$ , which has zero measure. Since finite union of zero-measure sets still has measure zero, the event that zero valued elements exist in the diagonal of $D _ { X }$ or $D _ { Y }$ happens with probability zero. + +If $i$ -th and $j$ -th diagonal elements of $D _ { X } D _ { Y } ^ { - 1 }$ have same value, we have $q _ { i } ^ { \top } \zeta _ { 1 } ( q _ { i } ^ { \top } \zeta _ { 2 } ) ^ { - 1 } \ =$ $q _ { j } ^ { \top } \zeta _ { 1 } ( q _ { j } ^ { \top } \zeta _ { 2 } ) ^ { - 1 }$ . Again, we know the solution space is a lower-dimensional manifold in $\mathbb { R } ^ { 2 k }$ space, with measure zero. Since finite union of zero-measure sets still has measure zero, the event that duplicated diagonal elements exist in $D _ { X } D _ { Y } ^ { - 1 }$ happens with probability zero. □ + +# A.2 NOISY CASE + +Now, we discuss how to handle the noisy case (i.e. $y = \sigma ( W x ) + \xi )$ . The corresponding algorithm is described in Algorithm 3. Note that the noise $\xi$ only affects the first two steps, i.e., pure neuron detector (Lemma 3) and finding span of vec ${ \mathrm { ; } } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ (Lemma 4). It does not affect the last two steps, i.e., finding $z _ { i }$ ’s from the span (Lemma 5) and learning the reduced single-layer network. Because + +# Algorithm 3 Learning Two-layer Neural Networks with Noise + +Input: Samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ generated according to Equation (2) +Output: Weight matrices $W$ and $A$ . 1: {Finding span of $\nu e c ^ { * } \big ( z _ { i } z _ { i } ^ { \top } \big ) \big \}$ +2: Use first half of samples (i.e. $\{ ( x _ { i } , y _ { i } ) \} _ { i = 1 } ^ { n / 2 } )$ to estimate empirical moments $\hat { \mathbb { E } } [ x x ^ { \top } ] , \hat { \mathbb { E } } [ y x ^ { \top } ]$ , $\hat { \mathbb { E } } [ y y ^ { \top } ] , \hat { \mathbb { E } } [ y \otimes x ^ { \otimes 3 } ]$ and $\hat { \mathbb { E } } [ y \otimes y \otimes ( x \otimes x ) ]$ . +3: Compute the vector $\begin{array} { r } { f ( u ) = 2 \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) \cdot ( \hat { \mathbb { E } } [ ( u ^ { \top } y ) x ^ { \top } ] \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes 2 \hat { \mathbb { E } } [ ( u ^ { \top } x ) ^ { \top } ] - 2 \hat { \mathbb { E } } [ ( u ^ { \top } y ) ^ { 2 } ] ) ^ { \top } \big ] } \end{array}$ $\boldsymbol { x } ) ] + \Big ( \hat { \mathbb { E } } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) ^ { 2 } \big ] - 2 \hat { \mathbb { E } } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \boldsymbol { x } ^ { \top } \big ] \hat { \mathbb { E } } \big [ \boldsymbol { x } \boldsymbol { x } ^ { \top } \big ] ^ { - 1 } \hat { \mathbb { E } } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \boldsymbol { x } \big ] \Big ) \hat { \mathbb { E } } [ \boldsymbol { x } \otimes \boldsymbol { x } ]$ where each entry is expressed as a degree-2 polynomial over $u$ . +4: Construct matrix $T \in \overline { { \mathbb { R } ^ { d ^ { 2 } } } } \times ( k _ { 2 } + k )$ such that, $T \mathrm { v e c } ^ { * } ( u u ^ { \top } ) = f ( u )$ . +5: Compute the $k$ -least right singular vectors of $T$ , denoted by v $\mathsf { e c } ^ { * } ( U _ { 1 } ) , \mathsf { v e c } ^ { * } ( U _ { 2 } ) , \cdot \cdot \cdot , \mathsf { v e c } ^ { * } ( U _ { k } )$ . Let $S$ be a $k _ { 2 } + k$ by $k$ matrix, where the $i$ -th column of $S$ is vector vec $^ { * } ( U _ { i } )$ . $\{$ {Here span $S$ is equal to span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \} . \}$ 6: {Finding $z _ { i }$ ’s from span} +7: Let $X = \mathrm { m a t } ^ { * } ( S \zeta _ { 1 } )$ , $\dot { Y } = \operatorname* { m a t } ^ { * } ( S \zeta _ { 2 } )$ , where $\zeta _ { 1 }$ and $\zeta _ { 2 }$ are two independently sampled $k$ - dimensional standard Gaussian vectors. +8: Let $z _ { 1 } , . . . , z _ { k }$ be eigenvectors of $X Y ^ { - 1 }$ . +9: For each $z _ { i }$ , use the second half of samples $\{ ( x _ { i } , y _ { i } ) \} _ { i = n / 2 + 1 } ^ { n }$ to estimate $\hat { \mathbb { E } } [ z _ { i } ^ { \top } y ]$ . If $\hat { \mathbb { E } } [ z _ { i } ^ { \top } y ] < 0$ let $z _ { i } \gets - z _ { i }$ . {Here $z _ { i }$ ’s are normalized rows of $A ^ { - 1 }$ .} +10: {Reduce11: For each , $I$ -Let er Problem}be the output of Algorithm 1 with input . $z _ { i }$ $v _ { i }$ $\{ ( x _ { j } , z _ { i } ^ { \top } y _ { j } ) \} _ { j = n / 2 + 1 } ^ { n }$ +12: Let $Z$ be the matrix whose rows are $z _ { i } ^ { \top }$ ’s, $V$ be the matrix whose rows are $v _ { i } ^ { \top }$ ’s. +13: return $V , Z ^ { - 1 }$ . + +Lemma 5 is independent of the model and Lemma 1 is linear wrt. noise $\xi$ , which has zero mean and is independent of input $x$ . + +Many of the steps in Algorithm 3 are designed with the robustness of the algorithm in mind. For example, in step 5 for the exact case we just need to compute the null space of $T$ . However if we use the empirical moments the null space might be perturbed so that it has small singular values. The separation of the input samples into two halves is also to avoid correlations between the steps, and is not necessary if we have the exact moments. + +Modification for pure neuron detector: Recall that in the noiseless case, our pure neuron detector contains a term $\mathbb { E } [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) ]$ , which causes a noise square term in the noisy case. Here, we modify our pure neuron detector to cancel the extra noise square term. In the following lemma, we state our modified pure neuron detector in Equation 11, and give it a characterization. + +Lemma 9. Suppose $y = A \sigma ( W x ) + \xi ,$ for any $u \in \mathbb { R } ^ { k }$ , we have + +$$ +\begin{array} { r l r } { { f ( \boldsymbol { u } ) : = 2 \mathbb { E } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \cdot \big ( \mathbb { E } [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \boldsymbol { x } ^ { \top } ] \mathbb { E } [ \boldsymbol { x } \boldsymbol { x } ^ { \top } ] ^ { - 1 } \boldsymbol { x } \big ) \cdot \big ( \boldsymbol { x } \otimes \boldsymbol { x } \big ) \big ] - \mathbb { E } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) ^ { 2 } ( \boldsymbol { x } \otimes \boldsymbol { x } ) \big ] } } \\ & { } & { + ( \mathbb { E } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) ^ { 2 } \big ] - 2 \mathbb { E } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \boldsymbol { x } ^ { \top } \big ] \mathbb { E } \big [ \boldsymbol { x } \boldsymbol { x } ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( \boldsymbol { u } ^ { \top } \boldsymbol { y } ) \boldsymbol { x } \big ] ) \mathbb { E } [ \boldsymbol { x } \otimes \boldsymbol { x } ] } \\ & { } & { = \displaystyle \sum _ { 1 \leq i < j \leq k } ( \boldsymbol { A } ^ { \top } \boldsymbol { u } \boldsymbol { u } ^ { \top } \boldsymbol { A } ) _ { i j } N _ { i j } - \Big ( \sum _ { 1 \leq i < j \leq k } ( \boldsymbol { A } ^ { \top } \boldsymbol { u } \boldsymbol { u } ^ { \top } \boldsymbol { A } ) _ { i j } m _ { i j } \Big ) \mathbb { E } [ \boldsymbol { x } \otimes \boldsymbol { x } ] , } \end{array} +$$ + +where $N _ { i j } \ ' _ { s }$ are columns of the distinguishing matrix (Definition $^ { l }$ ), and $\begin{array} { r l } { m _ { i j } } & { { } : = } \end{array}$ $\mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( \bar { w } _ { j } ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ]$ . + +We defer the proof of this lemma to the end of this section. Recall that the augmented distinguishing matrix $M$ consists of the distinguishing matrix $N$ plus column $\mathbb { E } [ x \otimes x ]$ . Now, we need to assume the augmented distinguishing matrix $M$ is full rank. + +Modification for finding span: For Lemma 4, as we discussed above, here we assume the augmented distinguishing matrix $M$ is full rank. The corresponding lemma is stated as follows (the proof is exactly the same as previous Lemma 4): + +Lemma 10. Let $T$ be the unique $\mathbb { R } ^ { d ^ { 2 } \times ( k _ { 2 } + k ) }$ matrix that satisfies $T \nu e c ^ { * } ( u u ^ { \top } ) = f ( u )$ (defined in Equation $1 l$ ), suppose the augmented distinguishing matrix is full rank, then the nullspace of $T$ is exactly the span of $\{ \nu e c ^ { * } ( z _ { i } z _ { i } ^ { \top } ) \}$ . + +Similar to Theorem 4, we provide the following theorem for the noisy case. The proof is almost the same as Theorem 4 by using the noisy version lemmas (Lemmas 9 and 10). + +Theorem 5. Suppose $\mathbb { E } [ x x ^ { \top } ] , A , W$ and the augmented distinguishing matrix $M$ are all full rank, and Algorithm 3 has access to the exact moments, then the network returned by the algorithm computes exactly the same function as the original neural network. + +Now, we only need to prove Lemma 9 to finish this noise case. + +Proof of Lemma 9. Similar to (5) and (6), we deduce these three terms in RHS of (11) one by one as follows. For the first term, it is exactly the same as (5) since the expectation is linear wrt. $\xi$ . Thus, we have + +$$ +\begin{array} { r l } & { \ 2 \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] } \\ & { = \frac { 1 } { 2 } \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i i } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] . } \end{array} +$$ + +Now, let’s look at the second term $\mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ]$ which is slightly different from (6) due to the noise $\xi$ . Particularly, we add the third term to cancel this extra noise square term later. + +$$ +\begin{array} { r l } & { \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { = \mathbb { E } \big [ ( u ^ { \top } ( A \sigma ( W x ) + \xi ) ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { = \mathbb { E } \big [ ( u ^ { \top } A \sigma ( W x ) ) ^ { 2 } ( x \otimes x ) \big ] + \mathbb { E } \big [ ( u ^ { \top } \xi ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { = \frac { 1 } { 2 } \displaystyle \sum _ { 1 \leq i \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i i } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ^ { 2 } ( x \otimes x ) \big ] + 2 \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \end{array} +$$ + +$$ ++ \mathbb { E } \left[ ( u ^ { \top } \xi ) ^ { 2 } ( x \otimes x ) \right] , +$$ + +where (15) uses (6). + +For the third term, we have + +$$ +\begin{array} { r l r } { { \mathbb { E } [ ( u ^ { \top } y ) ^ { 2 } ] - 2 \mathbb { E } [ ( u ^ { \top } y ) u ^ { \top } ] \mathbb { E } [ x ^ { \top \cdot \tau } ] ^ { - 1 } \mathbb { E } [ ( u ^ { \top } y ) x ] } } \\ & { } & { = \mathbb { E } [ ( u ^ { \top } \mathcal { A } \sigma ( W x ) ) ^ { 2 } ] + \mathbb { E } [ ( u ^ { \top } \xi ) ^ { 2 } ] - \frac { 1 } { 2 } \mathbb { E } [ \langle \mathcal { A } ^ { \top } , u , W x \rangle ^ { 2 } ] } \\ & { = \sum _ { 1 \leq i \leq i } A ^ { \top } u u ^ { \top } A \rangle _ { 3 \mathbb { E } } \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ^ { 2 } ] - \frac { 1 } { 2 } \sum _ { 1 \leq i \leq i } A ^ { \top } u ^ { \top } A \rangle \mathbb { E } [ ( w _ { i } ^ { \top } x ) ^ { 2 } ] } \\ & { } & { \overset { \mathrm { ( 4 ) } } { = } + \sum _ { 1 \leq i \leq i } \sum _ { 1 \leq i } ( A ^ { \top } u w _ { i } ^ { \top } A ) _ { i \beta } \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) z ( w _ { i } ^ { \top } x ) ] - \sum _ { 1 \leq i \leq i } ( A ^ { \top } u u ^ { \top } A ) _ { i \beta } \mathbb { E } [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ] } \\ & { } & { + \frac { 1 } { 1 \leq i \leq i \leq j \leq k } } \\ & { } & { = + \mathbb { E } [ ( u ^ { \top } \xi ) ^ { 2 } ] } \\ & { = - \sum _ { 1 \leq i \leq i \leq j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } \mathbb { B } [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ] \{ ( w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 ) \} + \mathbb { E } [ ( u ^ { \top } \xi ) ^ { 2 } ] } \\ & { = - \sum _ { 1 \leq i \leq j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { i j } m _ { i i } + \mathbb { E } [ ( u ^ { \top } \xi ) ^ { 2 } ] , } \\ & = - \sum _ { 1 \leq i \leq j \leq k } ( A ^ { \top } u u ^ \end{array} +$$ + +where the third equality holds due to Lemma 6 and Lemma 7, and (16) uses the definition of $m _ { i j }$ + +# Algorithm 4 Learning Two-layer Neural Networks with Non-square $A$ + +Input: Samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ generated according to Equation (2). +Output: Weight matrices $W \in \mathbb { R } ^ { k \times d }$ and $A \in ^ { l \times k }$ . +1: Using half samples (i.e. $\{ ( x _ { i } , y _ { i } ) \} _ { i = 1 } ^ { n / 2 } )$ to estimate empirical moments $\hat { \mathbb { E } } [ y x ^ { \top } ]$ . +2: Let $P$ be a $l \times k$ matrix, which columns are left singular vectors of $\hat { \mathbb { E } } [ y x ^ { \top } ]$ . +3: Run Algorithm 3 on samples $\{ ( x _ { i } , P ^ { \top } y _ { i } ) \} _ { i = n / 2 } ^ { n } .$ . Let the output of Algorithm 3 be $V , Z ^ { - 1 }$ . +4: return $V , P Z ^ { - 1 }$ . + +Finally, we combine these three terms (13–16) as follows: + +$$ +\begin{array} { r l } & { f ( u ) = 2 \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { \qquad + \left( \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] - 2 \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ \mathbb { x } x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x \big ] \right) \mathbb { E } [ x \otimes x ] } \\ & { = \displaystyle \sum _ { 1 \leq i < j \leq k } \big ( A ^ { \top } u u ^ { \top } A _ { j \downarrow } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] } \\ & { \qquad - 2 \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A _ { j \downarrow } ) \mathbb { E } \big [ \sigma ( w _ { i } ^ { \top } x ) \sigma ( w _ { j } ^ { \top } x ) ( x \otimes x ) \big ] - \mathbb { E } \big [ ( u ^ { \top } \xi ) ^ { 2 } \big ] \mathbb { E } \big [ x \otimes x \big ] } \\ & { \qquad + \left( - \displaystyle \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { j j } m _ { s j } + \mathbb { E } \big [ ( u ^ { \top } \xi ) ^ { 2 } \big ] \right) \mathbb { E } \big [ x \otimes x \big ] } \\ & { = \displaystyle \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u u ^ { \top } A ) _ { j j } N _ { i j } - \Big ( \displaystyle \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } u ^ { \top } A ) _ { i j } m _ { i j } \Big ) \mathbb { E } [ x \otimes x ] , } \end{array} +$$ + +where (17) uses (9) (same as (7)). + +# A.3 EXTENSION TO NON-SQUARE $A$ + +In this paper, for simplicity, we have assumed that the dimension of output equals the number of hidden units and thus $A$ is a $k \times k$ square matrix. Actually, our algorithm can be easily extended to the case where the dimension of output is at least the number of hidden units. In this section, we give an algorithm for this general case, by reducing it to the case where $A$ is square. The pseudo-code is given in Algorithm 4. + +Theorem 6. Suppose $\mathbb { E } [ x x ^ { \top } ] , W , A$ and the augmented distinguishing matrix $M$ are all full rank, and Algorithm $^ { 4 }$ has access to the exact moments, then the network returned by the algorithm computes exactly the same function as the original neural network. + +Proof. Let the ground truth parameters be $A \in \mathbb { R } ^ { l \times k }$ and $W \in \mathbb { R } ^ { k \times d }$ . The samples are generated by $y = A \sigma ( W x ) + \xi$ , where the noise $\xi$ is independent with input $x$ . We have $\begin{array} { r } { \mathbb E [ y \dot { { x } } ^ { \top } ] = \frac 1 2 \mathbf { \bar { A } } W \mathbb E [ { { x } } { { x } } ^ { \top } ] } \end{array}$ . Since both $W$ and $\mathbb { E } [ x x ^ { \top } ]$ are full-rank, we know the column span of $\mathbb { E } [ y x ^ { \top } ]$ are exactly the column span of $A$ . Furthermore, we know the columns of $P$ is a set of orthonormal basis for the column span of $A$ . + +For a ground truth neural network with weight matrices $W$ and $P ^ { \top } A$ , the generated sample will just be $( x , P ^ { \top } y )$ . According to Theorem 5, we know for any input $x$ , we have $Z ^ { - 1 } \sigma ( { \bar { V } } x ) =$ $\mathbf { \dot { \nabla } } P ^ { \top } A \sigma ( \dot { W } x )$ . Thus, we have + +$$ +P Z ^ { - 1 } \sigma ( V x ) = P P ^ { \top } A \sigma ( W x ) = A \sigma ( W x ) , +$$ + +where the second equality holds since $P P ^ { \top }$ is just the projection matrix to the column span of $A$ . □ + +# B ROBUSTNESS OF MAIN ALGORITHM + +In this section we will show that even if we do not have access to the exact moments, as long as the empirical moments are estimated with enough (polynomially many) samples, Algorithm 2 and + +Algorithm 3 can still learn the parameters robustly. We will focus on Algorithm 3 as it is more general, the result for Algorithm 2 can be viewed as a corollary when the noise $\xi = 0$ . Throughout this section, we will use $\bar { \boldsymbol { V } } , \hat { \boldsymbol { Z } } ^ { - 1 }$ to denote the results of Algorithm 3 with empirical moments, and use $V , Z ^ { - 1 }$ for the results when the algorithm has access to exact moments, similarly for other intermediate results. For the robustness of Algorithm 3, we prove the following theorem. + +Theorem 7. Assume that the norms of $x , \xi , A$ are bounded by $\| x \| \leq \Gamma , \| \xi \| \leq P _ { 2 } , \| A \| \leq P _ { 1 } ,$ , the covariance matrix and the weight matrix are robustly full rank: $\sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \geq \gamma , \sigma _ { \operatorname* { m i n } } ( A ) \geq \beta$ . Further assume that the augmented distinguishing matrix has smallest singular values $\sigma _ { \mathrm { m i n } } ( M ) \geq$ $\alpha$ . For any small enough , for any $\delta < 1$ , given poly $\left( \Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \epsilon , 1 / \gamma , 1 / \alpha , 1 / \beta , 1 / \delta \right)$ number of i.i.d. samples, let the output of Algorithm 3 be $\hat { V } , \hat { Z } ^ { - 1 }$ , we know with probability at least $1 - \delta$ , + +$$ +\| A \sigma ( W x ) - \hat { Z } ^ { - 1 } \sigma ( \hat { V } x ) \| \le \epsilon , +$$ + +for any input $x$ + +In order to prove the above Theorem, we need to show that each step of Algorithm 3 is robust. We can divide Algorithm 3 into three steps: finding the span of $\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } ) ^ { \cdot }$ ’s; finding $z _ { i }$ ’s from the span of $\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ ’s; recovering first layer using Algorithm 1. We will first state the key lemmas that prove every step is robust to noise, and finally combine them to show our main theorem. + +First, we show that with polynomial number of samples, we can approximate the span of $\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ ’s in arbitrary accuracy. Let $\hat { T }$ be the empirical estimate of $T$ , which is the pure neuron detector matrix as defined in Algorithm 3. As shown in Lemma 10, the null space of $T$ is exactly the span of $\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ ’s. We use standard matrix perturbation theory (see Section D.2) to show that the null space of $T$ is robust to small perturbations. More precisely, in Lemma 11, we show that with polynomial number of samples, the span of $k$ least singular vectors of $\hat { T }$ is close to the null space of $T$ . + +Lemma 11. Under the same assumptions as in Theorem 7, let $S \in \mathbb { R } ^ { ( k _ { 2 } + k ) \times k }$ be the matrix whose $k$ columns are the $k$ least right singular vectors of $T$ . Similarly define √ $\hat { S } \in \mathbb { R } ^ { ( k _ { 2 } + k ) \times k }$ for empirical estimate $\hat { T } .$ . Then for any $\epsilon \leq \gamma / 2 ,$ , for any $\delta < 1$ , given $\begin{array} { r } { O ( \frac { d ^ { 3 } \Gamma ^ { 1 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } . } \end{array}$ ) number of i.i.d. samples, we know with probability at least $1 - \delta$ , + +$$ +\lVert S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \rVert \leq \frac { \sqrt { 2 } \epsilon } { \alpha \beta ^ { 2 } } . +$$ + +The proof of the above lemma is in Section B.1. Basically, we need to lowerbound the spectral gap ( $k _ { 2 }$ -th singular value of $T$ ) and to upperbound the Frobenius norm of $T - { \hat { T } }$ . Standard matrix perturbation bound shows that if the perturbation is much smaller than the spectral gap, then the null space is preserved. + +Next, we show that we can robustly find $z _ { i }$ ’s from the span of $\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \top } )$ ’s. Since this step of the algorithm is the same as the simultaneous diagonalization algorithm for tensor decompositions, we use the robustness of simultaneous diagonalization (Bhaskara et al., 2014) to show that we can find $z _ { i }$ ’s robustly. The detailed proof is in Section B.2. + +Lemma 12. Suppose that $\begin{array} { r c l } { \| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \| _ { F } } & { \leq } & { \epsilon , \| A \| } \\ & { } & { \geq } \end{array} \leq \epsilon , \| A \| \ \leq \ { P } _ { 1 } , \| \xi \| \ \leq \ P _ { 2 } , \sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \ \geq$ $\gamma , \sigma _ { \operatorname* { m i n } } ( A ) ~ \geq ~ \beta$ . Let $\hat { X } \ = \ m a t ^ { * } ( \hat { S } \zeta _ { 1 } ) , \hat { Y } \ = \ m a t ^ { * } ( \hat { S } \zeta _ { 2 } )$ , where $\zeta _ { 1 }$ and $\zeta _ { 2 }$ are two independent standard Gaussian vectors. Let $z _ { 1 } , \cdots z _ { k }$ be the normalized row vectors of $A ^ { - 1 }$ . Let $\hat { z } _ { 1 } , . . . , \hat { z } _ { k }$ be the eigenvectors of $\hat { X } \hat { Y } ^ { - 1 }$ (after sign flip). For any $\delta > 0$ and small enough $\epsilon _ { \mathrm { { \mathrm { { } } } } }$ , with $O ( \frac { ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( d / \delta ) } { \epsilon ^ { 2 } } )$ number of i.i.d. samples in $\hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y ]$ , with probability at least $1 - \delta$ over the randomness of $\zeta _ { 1 } , \zeta _ { 2 }$ and i.i.d. samples, there exists a permutation $\pi ( i ) \in [ \dot { k } ]$ such that + +$$ +\begin{array} { r } { \| \hat { z } _ { i } - z _ { \pi [ i ] } \| \le p o l y ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) , } \end{array} +$$ + +for any $1 \leq i \leq k$ + +Finally, given $\hat { z } _ { i }$ ’s, the problem reduces to a one-layer problem. We will first give an analysis for Algorithm 1 as a warm-up. When we call Algorithm 1 from Algorithm 3, the situation is slightly different. Note we reserve fresh samples for this step, so that the samples used by Algorithm 1 are still independent with the estimate $\hat { z } _ { i }$ (learned using the other set of samples). However, since $\hat { z } _ { i }$ is not equal to $z _ { i }$ , this introduces an additional error term $\left( \hat { z } _ { i } - z _ { i } \right) ^ { \top } y$ which is not independent of $x$ and cannot be captured by $\xi$ . We modify the proof for Algorithm 1 to show that the algorithm is still robust as long as $\| \hat { z } _ { i } - z _ { i } \|$ is small enough. + +Lemma 13. Assume that $\| x \| \leq \Gamma , \| A \| \leq P _ { 1 } , \| \xi \| \leq P _ { 2 }$ and $\sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \geq \gamma$ . Suppose that for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any  ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ42 ) number of samples for Algorithm $^ { l }$ , we know with probability at least $1 - \delta$ , + +$$ +\| v _ { i } - \hat { v } _ { i } \| \leq \frac { 2 \tau ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) \Gamma } { \gamma } + 2 \epsilon , +$$ + +for each $1 \leq i \leq k$ . + +Combining the above three lemmas, we prove Theorem 7 in Section B.4. + +B.1 ROBUST ANALYSIS FOR FINDING THE SPAN OF $\{ \mathrm { V E C } ^ { * } ( z _ { i } z _ { j } ^ { \top } ) \}$ ’ S + +We first prove that the step of finding the span of $\{ \mathrm { v e c } ^ { * } ( z _ { i } z _ { j } ^ { \top } ) \}$ is robust. The main idea is based on standard matrix perturbation bounds (see Section D.2). We first give a lowerbound on the $k _ { 2 }$ -th singular value of $T$ , giving a spectral gap between the smallest non-zero singular value and the null space. See the lemma below. The proof is given in Section B.1.1. + +Lemma 14. Suppose $\sigma _ { \mathrm { m i n } } ( M ) \geq \alpha , \sigma _ { \mathrm { m i n } } ( A ) \geq \beta$ , we know that matrix $T$ has rank $k _ { 2 }$ and the $k _ { 2 }$ -th singular value of $T$ is lower bounded by $\dot { \alpha } \beta ^ { 2 }$ . + +Then we show that with enough samples the estimate $\hat { T }$ is close enough to $T$ , so Wedin’s Theorem (Lemma 25) implies the subspace found is also close to the true nullspace of $T$ . The proof is deferred to Section B.1.2. + +Lemma 15. Assume that $\| x \| \leq \Gamma , \| A \| \leq P _ { 1 } , \| \xi \| \leq P _ { 2 }$ and $\sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \geq \gamma > 0$ , then for any $\epsilon \leq \gamma / 2 ,$ , for any $1 > \delta > 0$ , given $\begin{array} { r } { O ( \frac { d ^ { 3 } \Gamma ^ { 1 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of i.i.d. samples, we know + +$$ +\| \hat { T } - T \| _ { F } \leq \epsilon , +$$ + +with probability at least $1 - \delta$ . + +Finally we combine the above two lemmas and show that the span of the least $k$ right singular vectors of $\hat { T }$ is close to the null space of $T$ . + +Lemma 11. Under the same assumptions as in Theorem 7, let $S \in \mathbb { R } ^ { ( k _ { 2 } + k ) \times k }$ be the matrix whose $k$ columns are the $k$ least right singular vectors of $T$ . Similarly define $\hat { S } \in \mathbb { R } ^ { ( k _ { 2 } + k ) \times k }$ for empirical estimate $\hat { T }$ . Then for any $\epsilon \leq \gamma / 2 ,$ , for any $\delta < 1$ , given $\begin{array} { r } { O ( \frac { d ^ { 3 } \Gamma ^ { 1 4 } ( \dot { \Gamma } P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } . } \end{array}$ ) number of i.i.d. samples, we know with probability at least $1 - \delta$ , + +$$ +\lVert S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \rVert \leq \frac { \sqrt { 2 } \epsilon } { \alpha \beta ^ { 2 } } . +$$ + +Proof. According to Lemma 15, given $\begin{array} { r } { O ( \frac { d ^ { 3 } \Gamma ^ { 1 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of i.i.d. samples, we know with probability at least $1 - \delta$ , + +$$ +\| \hat { T } - T \| _ { F } \leq \epsilon . +$$ + +According to Lemma 14, we know $\sigma _ { k _ { 2 } } ( T ) \geq \alpha \beta ^ { 2 }$ . Then, due to Lemma 27, we have + +$$ +\begin{array} { r l } & { \| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \| \leq \displaystyle \frac { \sqrt { 2 } \| T - \hat { T } \| _ { F } } { \sigma _ { k _ { 2 } } ( T ) } } \\ & { \qquad \leq \displaystyle \frac { \sqrt { 2 } \epsilon } { \alpha \beta ^ { 2 } } . } \end{array} +$$ + +![](images/d88852d23cdc3297faa4803e06e6a47efe5846f9cd128c8a3167800d9f70de02.jpg) +Figure 5: Characterize $\mathrm { T }$ as the product of four matrices. + +# B.1.1 LOWERBOUNDING $k _ { 2 }$ -TH SINGULAR VALUE OF $T$ + +In order to lowerbound the $k _ { 2 }$ -th singular value of $T$ , we first express $T$ as the product of four simpler matrices, $T = M B C F$ , as illustrated in Figure 5. The definitions of these four matrices $M \in \mathbb { R } ^ { d ^ { 2 } \times ( k _ { 2 } + 1 ) } , B \in \mathbb { R } ^ { ( k _ { 2 } + 1 ) \times k _ { 2 } } , C \in \mathbb { R } ^ { ( k _ { 2 } \times k ^ { 2 } ) } , F \in \mathbb { R } ^ { k ^ { 2 } \times ( k _ { 2 } + k ) }$ will be introduced later as we explain their effects. From Lemma 9, we know that + +$$ +T \mathrm { v e c } ^ { * } ( U ) = \sum _ { \substack { 1 \leq i < j \leq k } } ( A ^ { \top } U A ) _ { i j } M _ { i j } - \big ( \sum _ { \substack { 1 \leq i < j \leq k } } ( A ^ { \top } U A ) _ { i j } m _ { i j } \big ) \mathbb { E } [ x \otimes x ] , +$$ + +for any symmetric $k \times k$ matrix $U$ . + +Note that ${ \mathrm { v e c } } ^ { * } ( U )$ is a $( k _ { 2 } + k )$ -dimensional vector. For convenience, we first use matrix $F$ to transform vec $^ * ( U )$ to ${ \mathrm { v e c } } ( U )$ , which has $k ^ { 2 }$ dimensions. Matrix $F$ is defined such that $F \mathrm { v e c } ^ { * } ( U ) =$ ${ \mathrm { v e c } } ( U )$ , for any $k \times k$ symmetric matrix $U$ . Note that this is very easy as we just need to duplicate all the non-diagonal entries. + +Second, we hope to get the coefficients $( A ^ { \top } U A ) _ { i j }$ ’s. Notice that + +$$ +\operatorname { v e c } ( A ^ { \top } U A ) = A ^ { \top } \otimes A ^ { \top } \operatorname { v e c } ( U ) = A ^ { \top } \otimes A ^ { \top } F \operatorname { v e c } ^ { * } ( U ) . +$$ + +Since we only care about the elements of $A ^ { \top } U A$ at the $i j$ -th position for $1 \leq i < j \leq k$ , we just pick corresponding rows of $A ^ { \top } \otimes A ^ { \top }$ to construct our matrix $C$ , which has dimension $k _ { 2 } \times k ^ { 2 }$ . + +The first matrix $M$ is the augmented distinguishing matrix (see Definition 1). In order to better understand the reason that we need matrix $B$ , let’s first re-write $T \mathrm { v e c } ^ { * } ( U )$ in the following way: + +$$ +T \mathrm { v e c } ^ { * } ( U ) = \sum _ { 1 \leq i < j \leq k } ( A ^ { \top } U A ) _ { i j } \Bigl ( M _ { i j } - m _ { i j } \mathbb { E } [ x \otimes x ] \Bigr ) . +$$ + +Thus, $T \mathrm { v e c } ^ { * } ( U )$ is just a linear combination of $( M _ { i j } - m _ { i j } { \mathbb E } [ x \otimes x ] )$ ’s with coefficients equal to $( A ^ { \top } U A ) _ { i j }$ ’s. We have already expressed coefficients $( A ^ { \top } U A ) _ { i j }$ ’s using $C F \mathrm { v e c } ^ { * } ( U )$ . Now, we just need to use matrix $B$ to transform the augmented distinguishing matrix $M$ to a $d ^ { 2 } \times k _ { 2 }$ matrix, with each column equal to $( M _ { i j } - m _ { i j } { \mathbb E } [ x \stackrel { \sim } { \otimes } x ] )$ . In order to achieve this, the first $k _ { 2 }$ rows of $B$ is just the identity matrix $I _ { k _ { 2 } }$ , and the last row of $B$ is $[ - m _ { 1 2 } , - m _ { 1 3 } , \cdot \cdot \cdot , - m _ { 1 k } , - m _ { 2 3 } , - m _ { 2 4 } , \cdot \cdot \cdot ] ^ { \intercal }$ . + +With above characterization of $T$ , we are ready to show that the $k _ { 2 }$ -th singular value of $T$ is lower bounded. + +Lemma 14. Suppose $\sigma _ { \mathrm { m i n } } ( M ) \geq \alpha , \sigma _ { \mathrm { m i n } } ( A ) \geq \beta$ , we know that matrix $T$ has rank $k _ { 2 }$ and the $k _ { 2 }$ -th singular value of $T$ is lower bounded by $\dot { \alpha } \beta ^ { 2 }$ . + +Proof. Since matrix $C$ has dimension $k _ { 2 } \times k ^ { 2 }$ , it’s clear that the rank of $T$ is at most $k _ { 2 }$ . We first prove that the rank of $T$ is exactly $k _ { 2 }$ . + +Since the first $k _ { 2 }$ rows of $B$ constitute the identity matrix $I _ { k _ { 2 } }$ , we know $B$ is a full-column rank matrix with rank equal to $k _ { 2 }$ . We also know that matrix $M$ is a full column rank matrix with rank $k _ { 2 } + 1$ . Thus, the product matrix $M B$ is still a full-column rank matrix with rank $k _ { 2 }$ . If we can prove that the product matrix $C F$ has full-row rank equal to $k _ { 2 }$ . It’s clear that $T = M B C F$ also has rank $k _ { 2 }$ . Next, we prove that $C F$ has full-row rank. + +Since $\sigma _ { \operatorname* { m i n } } ( A ) ~ \geq ~ \beta$ , we know $A ^ { \top } \otimes A ^ { \top }$ is full rank, and a subset of its rows $C$ has full row rank. For the sake of contradiction, suppose that there exists non-zero vector $a \in \mathbb { R } ^ { k _ { 2 } }$ , such that ${ \textstyle \sum } _ { l = 1 } ^ { k _ { 2 } } a _ { l } ( C F ) _ { [ l , : ] } = 0$ . Note that for any $1 \leq l \leq k _ { 2 }$ , $( C F ) _ { [ l , i i ] } = C _ { [ l , i i ] }$ for $1 \leq i \leq k$ and $( C F ) _ { [ l , i j ] } = C _ { [ l , i j ] } + C _ { [ l , j i ] }$ for $1 \leq i < j \leq k$ . Since $C$ consists of a subset of rows of $A ^ { \top } \otimes A ^ { \top }$ , we know $C _ { [ l , i j ] } = C _ { [ l , j i ] }$ for any $l$ and any $i < j$ . Thus, ${ \textstyle \sum } _ { l = 1 } ^ { k _ { 2 } } a _ { l } ( C F ) _ { [ l , : ] } = 0$ simply implies $\begin{array} { r } { \sum _ { l = 1 } ^ { k _ { 2 } } a _ { l } C _ { [ l , : ] } = 0 } \end{array}$ , which breaks the fact that $C$ is full-row rank. Thus, the assumption is false and $C F$ + +Now, let’s prove that the $k _ { 2 }$ -th singular value of $T$ is lower bounded. We first show that in the product characterization of $T$ , the smallest singular value of each individual matrix is lower bounded. According to the assumption, we know the smallest singular value of $M$ is lower bounded by $\alpha$ . Since the first $k _ { 2 }$ rows of matrix $B$ constitute a $k _ { 2 } \times k _ { 2 }$ identity matrix, we know + +$$ +\sigma _ { \operatorname* { m i n } } ( B ) : = \operatorname* { m i n } _ { u : \| u \| \leq 1 } \| B u \| \geq \operatorname* { m i n } _ { u : \| u \| \leq 1 } \| I _ { k _ { 2 } \times k _ { 2 } } u \| = : \sigma _ { \operatorname* { m i n } } ( I _ { k _ { 2 } \times k _ { 2 } } ) = 1 , +$$ + +where $u$ is any $k _ { 2 }$ -dimensional vector. + +Since $\sigma _ { \operatorname* { m i n } } ( A ) \geq \beta$ , we know $\sigma _ { \operatorname* { m i n } } ( A ^ { \top } \otimes A ^ { \top } ) \geq \beta ^ { 2 }$ . According to the construction of $C$ , we know $C$ consists a subset of rows of $A ^ { \top } \otimes A ^ { \top }$ . Denote the indices of the row not picked as $S$ . We have + +$$ +\begin{array} { r l } & { \sigma _ { \operatorname* { m i n } } ( C ) : = \underset { u : \| u \| \leq 1 } { \mathrm { m i n } } \| u ^ { \top } C \| } \\ & { \qquad = \underset { v : \| v \| \leq 1 } { \mathrm { m i n } } \underset { \Lambda ( v _ { i } = 0 , \forall i \in S ) } { \mathrm { m i n } } \| v ^ { \top } ( A ^ { \top } \otimes A ^ { \top } ) \| } \\ & { \qquad \geq \underset { v : \| v \| \leq 1 } { \mathrm { m i n } } \| v ^ { \top } ( A ^ { \top } \otimes A ^ { \top } ) \| } \\ & { \qquad = : \sigma _ { \operatorname* { m i n } } ( A ^ { \top } \otimes A ^ { \top } ) } \\ & { \qquad \geq \beta ^ { 2 } , } \end{array} +$$ + +where $u$ has dimension $k _ { 2 }$ and $v$ has dimension $k ^ { 2 }$ . + +We lowerbound the smallest singular value of $C F$ by showing that $\sigma _ { \mathrm { m i n } } ( C F ) \geq \sigma _ { \mathrm { m i n } } ( C )$ . For any unit vector $u \in \mathbb { R } ^ { k _ { 2 } }$ , we know $[ \Breve { \boldsymbol { u } } ^ { \top } \boldsymbol { C } \boldsymbol { F } ] _ { i i } = [ \boldsymbol { u } ^ { \top } \boldsymbol { C } ] _ { i i }$ for any $i$ and $[ u ^ { \top } C \dot { F } ] _ { i j } = [ u ^ { \top } C ] _ { i j } + [ u ^ { \top } C ] _ { j i }$ for any $i < j$ . We also know $[ \boldsymbol { u } ^ { \top } \boldsymbol { C } ] _ { i j } = [ \boldsymbol { u } ^ { \top } \boldsymbol { C } ] _ { j i }$ for $i < j$ . Thus, we know for any unit vector $u$ , $\| u ^ { \top } C F \| \geq \| u ^ { \top } C \|$ , which implies $\sigma _ { \mathrm { m i n } } ( C F ) \geq \sigma _ { \mathrm { m i n } } ( C )$ . + +Finally, since in the beginning we have proved that matrix $T$ has rank $k _ { 2 }$ , the $k _ { 2 }$ -th singular value is exactly the smallest non-zero singular value of $T$ . Denote the smallest non-zero singular of $T$ as $\sigma _ { \mathrm { m i n } } ^ { + } ( T ) \dot { }$ , we have + +$$ +\begin{array} { r l } & { \sigma _ { k _ { 2 } } ( T ) = \sigma _ { \operatorname* { m i n } } ^ { + } ( T ) } \\ & { \qquad \quad \geq \sigma _ { \operatorname* { m i n } } ( M ) \sigma _ { \operatorname* { m i n } } ( B ) \sigma _ { \operatorname* { m i n } } ( C F ) } \\ & { \qquad \quad \geq \alpha \beta ^ { 2 } , } \end{array} +$$ + +where the first inequality holds because both $M$ and $B$ has full column rank. + +# B.1.2 UPPERBOUNDING $\Vert \hat { T } - T \Vert _ { F }$ + +In this section, we prove that given polynomial number of samples, $\Vert \hat { T } - T \Vert _ { F }$ is small with high probability. We do this by standard matrix concentration inequalities. Note that our requirements on the norm of $x$ is just for convenience, and the same proof works as long as $x$ has reasonable tail-behavior (e.g. sub-Gaussian). + +Lemma 15. Assume that $\| x \| \leq \Gamma , \| A \| \leq P _ { 1 } , \| \xi \| \leq P _ { 2 }$ and $\sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \geq \gamma > 0$ , then for any $\epsilon \leq \gamma / 2 ,$ , for any $1 > \delta > 0$ , given $\begin{array} { r } { O ( \frac { d ^ { 3 } \Gamma ^ { 1 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of i.i.d. samples, we know + +$$ +\| \hat { T } - T \| _ { F } \leq \epsilon , +$$ + +with probability at least $1 - \delta$ . + +Proof. In order to get an upper bound for $\| { \hat { T } } - T \| _ { F }$ , we first show that $\Vert \hat { T } - T \Vert _ { 2 }$ is upper bounded. We know + +$$ +\begin{array} { r l } & { \| T - \hat { T } \| = \underset { v \in \mathbb { R } ^ { k _ { 2 } + k } : \| v \| \leq 1 } { \operatorname* { m a x } } \| ( T - \hat { T } ) v \| } \\ & { \qquad \leq \underset { U \in \mathbb { R } _ { s y m } ^ { k \times k } : \| U \| _ { F } \leq \sqrt { 2 } } { \operatorname* { m a x } } \| ( T - \hat { T } ) { \mathrm { v e c } } ^ { * } ( U ) \| . } \end{array} +$$ + +For any $k \times k$ symmetric matrix $U$ with eigenvalue decomposition $\begin{array} { r } { U = \sum _ { i = 1 } ^ { k } \lambda _ { i } u ^ { ( i ) } ( u ^ { ( i ) } ) ^ { \top } } \end{array}$ , according to the definition of , we know + +$$ +\begin{array} { r l } { \underset { \varrho \in \mathbb { R } _ { \varrho } ^ { k } ( \cdot , \mathbb { R } ) } { \sum \operatorname* { m a x } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } ( | T - \widetilde { T } | \operatorname* { m e s } ^ { * } ( | U | ) | = } & { \underset { \varrho \in \mathbb { R } _ { \varrho } ^ { k } ( \cdot , \mathbb { R } ) } { \sum \operatorname* { m a x } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } ( | T \nabla i - \widetilde { T } | \nabla i ) - \widetilde { T } \mathrm { e n } ^ { * } ( | U | ) } \\ & { \leq \underset { \varrho \in \mathbb { R } _ { \varrho } ^ { k } ( \cdot , \mathbb { R } ) } { \sum \operatorname* { m a x } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } ( | \nabla i - \widetilde { T } | \langle u ^ { ( i ) } \rangle - \widetilde { T } ( u ^ { ( k ) } \rangle ) | } \\ & { \leq \underset { \varrho \in \mathbb { R } _ { \varrho } ^ { k } ( \cdot , \mathbb { R } ) } { \sum \operatorname* { m a x } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } ( | \nabla i - \widetilde { T } | \langle u ^ { ( i ) } \rangle - \widetilde { T } ( u ^ { ( k ) } \rangle | } \\ & { < ( \underset { \varrho \in \mathbb { R } _ { \varrho } ^ { k } ( \cdot , \mathbb { R } ) } { \sum \operatorname* { m a x } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } | \nabla i - \widetilde { T } | \nabla i ) } \\ & { < ( \underset { \varrho \in \mathbb { R } _ { \varrho } ^ { k } ( \cdot , \mathbb { R } ) } { \sum \operatorname* { m a x } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } | T ( u ^ { ( k ) } - \widetilde { T } ( u ) | ) | } \\ & { \leq \widetilde { T } \overline { { \operatorname* { m a x } } } \underset { i = \varrho } { \overset { \mathrm { i n } } { \sum } } ( | T \nabla i - \widetilde { T } ( u ^ { ( k ) } | ) | } \\ & \leq \widetilde { T } \overline { { \operatorname* { m a x } } } \underset { i = \varrho } \end{array} +$$ + +where ${ \hat { f } } ( u ) = { \hat { T } } \mathrm { v e c } ^ { * } ( u u ^ { \top } )$ and the fourth inequality uses the Cauchy-Schwarz inequality. Next, we only need to upper bound $\begin{array} { r } { \operatorname* { m a x } _ { u : \| u \| \leq 2 } \| f ( u ) - \hat { f } ( u ) \| } \end{array}$ . Recall that + +$$ +\begin{array} { r l } & { f ( u ) = 2 { \mathbb E } \big [ ( u ^ { \top } y ) \cdot ( { \mathbb E } [ ( u ^ { \top } y ) x ^ { \top } ] { \mathbb E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - { \mathbb E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { \qquad + \Big ( { \mathbb E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] - 2 { \mathbb E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] { \mathbb E } \big [ x x ^ { \top } \big ] ^ { - 1 } { \mathbb E } \big [ ( u ^ { \top } y ) x \big ] \Big ) { \mathbb E } [ x \otimes x ] , } \end{array} +$$ + +and + +$$ +\begin{array} { r l } & { \hat { f } ( u ) = 2 \hat { { { \mathbb E } } } \big [ ( u ^ { \top } y ) \cdot ( \hat { { { \mathbb E } } } [ ( u ^ { \top } y ) x ^ { \top } ] \hat { { { \mathbb E } } } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - \hat { { { \mathbb E } } } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] } \\ & { \qquad + \Big ( \hat { { { \mathbb E } } } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] - 2 \hat { { { \mathbb E } } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \hat { { { \mathbb E } } } \big [ x x ^ { \top } \big ] ^ { - 1 } \hat { { { \mathbb E } } } \big [ ( u ^ { \top } y ) x \big ] \Big ) \hat { { { \mathbb E } } } [ x \otimes x ] . } \end{array} +$$ + +Notice that + +$$ +\begin{array} { r } { \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] \Big ) ^ { \top } = \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] . } \end{array} +$$ + +We first show that given polynomial number of samples, + +$$ +\left| 2 \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] - 2 \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] \right| +$$ + +is upper bounded with high probability. + +Since each row of $W$ has unit norm, we have $\| W \| \le \sqrt { k }$ . Due to the assumption that $\| x \| \leq$ $\Gamma , \| A \| \leq P _ { 1 } , \| \xi \| \leq P _ { 2 }$ , we have + +$$ +\begin{array} { r l } & { \| ( u ^ { \top } y ) x ^ { \top } \| \leq \| u \| \| A \sigma ( W x ) + \xi \| \| x \| } \\ & { \qquad \leq \| u \| ( \| A \| \| W \| \| x \| + \| \xi \| ) \| x \| } \\ & { \qquad \leq 2 \Gamma ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) . } \end{array} +$$ + +According to Lemma 24, we know given $O ( \frac { \Gamma ^ { 2 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ number of samples, + +$$ +\begin{array} { r } { | | \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] | \leq \epsilon , } \end{array} +$$ + +with probability at least $1 - \delta$ . + +Similarly, we can show that given $O ( \frac { \Gamma ^ { 6 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ number of samples, + +$$ +\begin{array} { r } { \left\| \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] \right\| \leq \epsilon , } \end{array} +$$ + +with probability at least $1 - \delta$ . + +$\| x x ^ { \top } \| \leq \Gamma ^ { 2 }$ , we know that given $O \big ( \frac { \Gamma ^ { 4 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } \big )$ number of samples, + +$$ +\left\| \triangleq [ x x ^ { \top } ] - \mathbb { E } [ x x ^ { \top } ] \right\| \leq \epsilon , +$$ + +with probability at least $1 - \delta$ . Suppose that $\epsilon \leq \gamma / 2 \leq \sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) / 2$ , we know $\hat { \mathbb { E } } [ x x ^ { \top } ]$ has full rank. According to Lemma 29, we have + +$$ +\left\| \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } - \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \right\| \leq 2 \sqrt { 2 } \frac { \left\| \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] - \mathbb { E } \big [ x x ^ { \top } \big ] \right\| } { \sigma _ { \operatorname* { m i n } } ^ { 2 } ( \mathbb { E } [ x x ^ { \top } ] ) } \leq 2 \sqrt { 2 } \epsilon / \gamma ^ { 2 } , +$$ + +with probability at least $1 - \delta$ . + +By union bound, we know for any $\epsilon < \gamma / 2$ , given $O ( \frac { \Gamma ^ { 6 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ number of samples, with probability at least , we have + +$$ +\begin{array} { r l } & { \left\| \hat { \mathbb E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] - \mathbb E \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \right\| \leq \epsilon , } \\ & { \left\| \hat { \mathbb E } \big [ x x ^ { \top } \big ] ^ { - 1 } - \mathbb E \big [ x x ^ { \top } \big ] ^ { - 1 } \right\| \leq 2 \sqrt { 2 } \epsilon / \gamma ^ { 2 } , } \\ & { \left\| \hat { \mathbb E } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] - \mathbb E \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] \right\| \leq \epsilon . } \end{array} +$$ + +Define + +$$ +\begin{array} { r l } & { E _ { 1 } : = \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] , } \\ & { E _ { 2 } : = \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } - \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } , } \\ & { E _ { 3 } : = \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] . } \end{array} +$$ + +Then, we have + +$$ +\begin{array} { r l } & { \| 2 \tilde { \mathbb { E } } [ ( \pi ^ { \top } y ) x ^ { \top } ] \tilde { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \tilde { \mathbb { E } } [ ( \pi ^ { \top } y ) x ( x \otimes x ) ^ { \top } ] - 2 \mathbb { E } [ ( \pi ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ ( \pi ^ { \top } y ) x ( x \otimes x ) ^ { \top } ] } \\ & { \leq 2 \| E [ \| E _ { 3 } \| ] [ E _ { 3 } ] + 2 \| E _ { 1 } \| \| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \| \| \mathbb { E } [ ( \pi ^ { \top } y ) x ( x \otimes x ) ^ { \top } ] \| } \\ & { \quad + 2 \| \mathbb { E } [ ( \pi ^ { \top } y ) x ^ { \top } ] \| \| E _ { 2 } \| \| E _ { 3 } [ ( \pi ^ { \top } y ) x ( x \otimes x ) ^ { \top } ] \| + 2 \| \mathbb { E } [ ( \pi ^ { \top } y ) x ^ { \top } ] \| \| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \| \| E _ { 3 } ] \| } \\ & { \quad + 2 \| E _ { 1 } \| \| E _ { 2 } \| \| \mathbb { E } [ ( \pi ^ { \top } y ) x ( x \otimes x ) ^ { \top } ] \| + 2 \| \mathbb { E } [ ( \pi ^ { \top } y ) x ^ { \top } ] \| \| E _ { 3 } \| + 2 \| E _ { 1 } \| \| E _ { 1 } x ^ { \top } ] ^ { - 1 } \| \| } \\ & { \leq 2 \Big ( \frac { 2 \sqrt { 2 } \epsilon ^ { 3 } } { \gamma ^ { 2 } } + \frac { 2 \| ^ { 3 } ( \Gamma ^ { \top } \Gamma \| _ { \sqrt { 1 } } \sqrt { K } + F _ { 2 } ) \epsilon } { \gamma } + \frac { 8 \sqrt { 2 } \Gamma ^ { 4 } ( \Gamma \| _ { \sqrt { 1 } } \sqrt { K } + F _ { 2 } ) ^ { 2 } \epsilon } { \gamma ^ { 2 } } + \frac { 2 \Gamma ( \Gamma P _ { 1 } \sqrt { K } + F _ { 2 } ) \epsilon } { \gamma } } \\ & \quad + \frac { 4 \sqrt { 2 } \Gamma ^ { 3 } ( \Gamma P _ { 1 } \sqrt { K } + F _ { 2 } ) \epsilon ^ { 2 } } { \gamma ^ { 2 } } \end{array} +$$ + +Thus, given $\begin{array} { r } { O ( \frac { \Gamma ^ { 1 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of samples, we know + +$$ +\begin{array} { r l } & { \left\| 2 \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) \cdot ( \hat { \mathbb { E } } [ ( u ^ { \top } y ) x ^ { \top } ] \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - 2 \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) ^ { \top } \big ] \right\| } \\ & { - \left\| 2 \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] - 2 \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x ( x \otimes x ) ^ { \top } \big ] \right\| } \end{array} +$$ + +with probability at least $1 - \delta$ . + +Now, let’s consider the second term + +$$ +\begin{array} { r } { \left\| \hat { \mathbb E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] - \mathbb E \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] \right\| . } \end{array} +$$ + +Since $\begin{array} { r l r } { \left\| ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \right\| } & { \leq } & { 4 \Gamma ^ { 2 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } } \end{array}$ , according to Lemma 24, we know given $O ( \frac { \Gamma ^ { 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 4 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ , + +$$ +\begin{array} { r } { \left| \left| \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] \right| \right| \leq \epsilon , } \end{array} +$$ + +with probability at least $1 - \delta$ . + +Next, let’s look at the third term + +$$ +\begin{array} { r } { \Big \| \mathbb { \hat { E } } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \mathbb { \hat { E } } [ x \otimes x ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \mathbb { E } [ x \otimes x ] \Big \| . } \end{array} +$$ + +Again, using Lemma 24 and union bound, we know given $O ( \frac { \Gamma ^ { 2 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ number of samples, we have + +$$ +\begin{array} { r l } & { \left\| \hat { \mathbb E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] - \mathbb E \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \right\| \leq \epsilon , } \\ & { \left\| \hat { \mathbb E } [ x \otimes x ] - \mathbb E [ x \otimes x ] \right\| \leq \epsilon . } \end{array} +$$ + +Thus, Define + +$$ +\begin{array} { r l } & { E _ { 4 } : = \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] } \\ & { E _ { 5 } : = \mathbb { \hat { E } } [ x \otimes x ] - \mathbb { E } [ x \otimes x ] . } \end{array} +$$ + +Then, we have + +$$ +\begin{array} { r l } & { \left| \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \hat { \mathbb { E } } [ x \otimes x ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \mathbb { E } [ x \otimes x ] \right| \Big | \leq \| E _ { 4 } \| \| E _ { 5 } \| + \| E _ { 4 } \| \| \mathbb { E } [ x \otimes x ] \| + \| \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \| \| E _ { 5 } \| } \\ & { \qquad \leq \epsilon ^ { 2 } + \Gamma ^ { 2 } \epsilon + 4 ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \epsilon } \\ & { \qquad = O ( ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \epsilon ) . } \end{array} +$$ + +Thus, we know that given $O ( \frac { \Gamma ^ { 2 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ number of samples, we know + +$$ +\begin{array} { r } { \left| \left| \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \hat { \mathbb { E } } [ x \otimes x ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \mathbb { E } [ x \otimes x ] \right| \right| \leq \epsilon , } \end{array} +$$ + +with probability at least $1 - \delta$ . + +Now, let’s bound the last term, + +$$ +\begin{array} { r } { \left| 2 \Big ( \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x \big ] \Big ) \hat { \mathbb { E } } \big [ x \otimes x \big ] - 2 \Big ( \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x \big ] \Big ) \mathbb { E } \big [ x \otimes x \big ] \right| . } \end{array} +$$ + +Similar as the first term, we can show that given $\begin{array} { r } { O ( \frac { \Gamma ^ { 1 0 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of samples, we have + +$$ +\begin{array} { r } { \mathbb { \hat { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { \hat { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { \hat { E } } \big [ ( u ^ { \top } y ) x \big ] \Big ) \mathbb { \hat { E } } \big [ x \otimes x \big ] - 2 \Big ( \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x \big ] \Big ) \mathbb { E } \big [ x \otimes x \big ] \Big \vert \Big \vert \le \epsilon } \end{array} +$$ + +with probability at least $1 - \delta$ . + +Now, we are ready to combine our bound for each of four terms. By union bound, we know given ( Γ14(ΓP1 k+P2)6 log( dδ ) ) number of samples, + +$$ +\begin{array} { r l } & { | 2 \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) \cdot ( \hat { \mathbb { E } } [ ( u ^ { \top } y ) x ^ { \top } ] \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] - 2 \mathbb { E } \big [ ( u ^ { \top } y ) \cdot ( \mathbb { E } [ ( u ^ { \top } y ) x ^ { \top } ] \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } x ) \cdot ( x \otimes x ) \big ] } \\ & { \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } ( x \otimes x ) \big ] | \leq \epsilon , } \\ & { | \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \hat { \mathbb { E } } [ x \otimes x ] - \mathbb { E } \big [ ( u ^ { \top } y ) ^ { 2 } \big ] \mathbb { E } [ x \otimes x ] | \Big \| \leq \epsilon , } \\ & { | 2 \Big ( \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x \big ] \Big ) \hat { \mathbb { E } } [ x \otimes x ] - 2 \Big ( \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x \big ] \Big ) \mathbb { E } [ x \otimes x ] \Big | } \\ & { ] 2 \Big ( \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } \hat { \mathbb { E } } \big [ ( u ^ { \top } y ) x \big ] \Big ) \hat { \mathbb { E } } [ x \otimes x ] - 2 \Big ( \mathbb { E } \big [ ( u ^ { \top } y ) x ^ { \top } \big ] \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \mathbb { E } \big [ ( u ^ { \top } y ) x \big ] \Big ) \mathbb { E } [ x \otimes x ] } \end{array} +$$ + +hold with probability at least $1 - \delta$ . Thus, we know + +$$ +\operatorname* { m a x } _ { u : \| u \| \leq 2 } \| f ( u ) - \hat { f } ( u ) \| \leq \epsilon + \epsilon + \epsilon + \epsilon = 4 \epsilon +$$ + +with probability at least $1 - \delta$ + +Recall that + +$$ +\begin{array} { r l } & { \| \hat { T } - T \| _ { F } \leq \sqrt { k _ { 2 } + k } \| \hat { T } - T \| } \\ & { \qquad \leq k \sqrt { 2 k } \underset { u : \| u \| \leq 2 } { \operatorname* { m a x } } \| f ( u ) - \hat { f } ( u ) \| , } \end{array} +$$ + +where the second inequality holds since $\begin{array} { r } { \| \hat { T } - T \| \leq \sqrt { 2 k } \operatorname* { m a x } _ { u : \| u \| \leq 2 } \| f ( u ) - \hat { f } ( u ) \| . } \end{array}$ + +Thus, we know given $\begin{array} { r } { O ( \frac { \Gamma ^ { 1 4 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 6 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of samples, + +$$ +\Vert \hat { T } - T \Vert _ { F } \leq k \sqrt { 2 k } \epsilon \leq d \sqrt { 2 d } \epsilon +$$ + +with probability at least $1 - \delta$ . Thus, given ( d3Γ14(ΓP1 k+P2)6 log( dδ )4 2 ) number of samples, + +$$ +\Vert \hat { T } - T \Vert _ { F } \leq \epsilon +$$ + +with probability at least $1 - \delta$ . + +# B.2 ROBUST ANALYSIS FOR SIMULTANEOUS DIAGONALIZATION + +In this section, we will show that the simultaneous diagonalization step in our algorithm is robust. Let $S$ and $\hat { S }$ be two $( k _ { 2 } + k )$ by $k$ matrices, whose columns consist of the least $k$ right singular vectors of $T$ and $\hat { T }$ respectively. + +According to Lemma 11, we know with polynomial number of samples, the Frobenius norm of $S S ^ { \top } - \bar { \hat { S } } \hat { S } ^ { \bot }$ is well bounded. However, due to the rotation issue of subspace basis, we cannot conclude that $\| S - { \hat { S } } \| _ { F }$ is small. Only after appropriate alignment, the difference between $S$ and $\hat { S }$ becomes small. + +Lemma 16. Let $S$ and $\hat { S }$ be two $( k _ { 2 } + k )$ by $k$ matrices, whose columns consist of the least $k$ right singular vectors of $T$ and $\hat { T }$ respectively. If $\| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \| _ { F } \leq \epsilon$ , there exists an rotation matrix $R \in \mathbb { R } ^ { k \times k }$ satisfying $\boldsymbol { R } \boldsymbol { R } ^ { \top } = \boldsymbol { R } ^ { \top } \boldsymbol { R } = \dot { \boldsymbol { I } } _ { k }$ , such that + +$$ +\| \hat { S } - S R \| _ { F } \leq 2 \epsilon . +$$ + +Proof. Since $S$ has orthonormal columns, we have $\sigma _ { k } ( S S ^ { \top } ) = 1$ . Then, according to Lemma 35, we know there exists rotation matrix $R$ such that + +$$ +\| \hat { S } - S R \| _ { F } \leq \frac { \| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \| _ { F } } { \sqrt { 2 ( \sqrt { 2 } - 1 ) } \sqrt { \sigma _ { k } ( S S ^ { \top } ) } } \leq 2 \epsilon . +$$ + +Let the $k$ columns of $S$ be $\operatorname { v e c } ^ { * } ( U _ { 1 } ) , \operatorname { v e c } ^ { * } ( U _ { 2 } ) , \cdot \cdot \cdot , \operatorname { v e c } ^ { * } ( U _ { k } )$ . Note each $U _ { i }$ can be expressed as $A ^ { - \top } D _ { i } A ^ { - 1 }$ , where $D _ { i }$ is a diagonal matrix. Let $Q$ be a $k \times k$ matrix, whose $i$ -th column consists of the diagonal elements of $D _ { i }$ , such that $Q _ { i j }$ equals the $j$ -th diagonal element of $D _ { i }$ . Let $\operatorname { v e c } ^ { * } ( X ) =$ $S R \zeta _ { 1 } , \bar { \mathrm { v e c } } ^ { * } ( Y ) = S R \zeta _ { 2 }$ , where $R$ is the rotation matrix in Lemma 16 and $\zeta _ { 1 } , \zeta _ { 2 }$ are two independent standard Gaussian vectors. Let $D _ { X } = \mathrm { { d i a g } } ( Q R \zeta _ { 1 } )$ and $D _ { Y } = \mathrm { { d i a g } } ( Q R \zeta _ { 2 } )$ . It’s not hard to check that $X = A ^ { - \top } D _ { X } A ^ { - 1 }$ and $Y = A ^ { - \top } D _ { Y } A ^ { - 1 }$ . Furthermore, we have $X Y ^ { - 1 } = A ^ { - \top } D _ { X } D _ { Y } ^ { - 1 } A ^ { \top }$ . Next, we show that the diagonal elements of $D _ { X } D _ { Y } ^ { - 1 }$ are well separated. + +Lemma 17. Assume that $\| A \| \leq P _ { 1 } , \sigma _ { \operatorname* { m i n } } ( A ) \geq \beta$ . Then for any $\delta > 0$ we know with probability at least $1 - \delta$ , we have + +$$ +\begin{array} { r l } & { \qquad \quad s e p ( D _ { X } D _ { Y } ^ { - 1 } ) \geq p o l y ( 1 / d , 1 / P _ { 1 } , \beta , \delta ) , } \\ & { \qquad s e p ( D _ { X } D _ { Y } ^ { - 1 } ) : = \operatorname* { m i n } _ { i \not = j } | ( D _ { X } D _ { Y } ^ { - 1 } ) _ { i i } - ( D _ { X } D _ { Y } ^ { - 1 } ) _ { j j } | . } \end{array} +$$ + +Proof. We first show that matrix $Q$ is well-conditioned. Since $U _ { i } ~ = ~ A ^ { - \top } D _ { i } A ^ { - 1 }$ , we have $\operatorname { v e c } ( { \mathsf { \bar { U } } } _ { i } ) = A ^ { - \top } \otimes A ^ { - \top } \operatorname { v e c } ( D _ { i } )$ . Let $U$ be a $k ^ { 2 } \times k$ matrix whose columns consist of ${ \mathrm { v e c } } ( U _ { i } )$ ’s. Also define $\bar { Q }$ as a $k ^ { 2 } \times k$ matrix whose columns are $\mathrm { v e c } ( D _ { i } )$ ’s. Note that matrix $\bar { Q }$ only has $k$ non-zero rows, which are exactly matrix $Q$ . With the above definition, we have $U = \bar { A } ^ { - \top } \bar { \otimes } A ^ { - \top } \bar { Q }$ . Since $\sigma _ { \operatorname* { m i n } } ( U ) \leq \lVert A ^ { - \top } \otimes \dot { A } ^ { - \top } \rVert \sigma _ { \operatorname* { m i n } } ( \bar { Q } )$ , we have + +$$ +\sigma _ { \operatorname* { m i n } } ( { \bar { Q } } ) \geq { \frac { \sigma _ { \operatorname* { m i n } } ( U ) } { \| A ^ { - \top } \otimes A ^ { - \top } \| } } . +$$ + +Notice that a subset of rows of $U$ constitute matrix $S$ , which is an orthonormal matrix. Thus, we have $\sigma _ { \operatorname* { m i n } } ( U ) \geq \sigma _ { \operatorname* { m i n } } ( S ) = 1$ . Since we assume $\sigma _ { \operatorname* { m i n } } ( A ) \geq \beta$ , we have + +$$ +\| A ^ { - \top } \otimes A ^ { - \top } \| = \| A ^ { - \top } \| ^ { 2 } = { \frac { 1 } { \sigma _ { \operatorname* { m i n } } ( A ) ^ { 2 } } } \leq { \frac { 1 } { \beta ^ { 2 } } } . +$$ + +Thus, we have $\sigma _ { \mathrm { m i n } } ( \bar { Q } ) \geq \beta ^ { 2 }$ , which implies $\sigma _ { \mathrm { m i n } } ( Q ) \ge \beta ^ { 2 }$ . + +We also know $\| U \| \ge \sigma _ { \operatorname* { m i n } } ( A ^ { - \top } \otimes A ^ { - \top } ) \| \bar { Q } \|$ , thus + +$$ +\lVert \bar { Q } \rVert \leq \frac { \lVert U \rVert } { \sigma _ { \operatorname* { m i n } } ( A ^ { - \top } \otimes A ^ { - \top } ) } . +$$ + +Since $\| S \| = 1$ , we know $\| U \| \leq { \sqrt { 2 } }$ . For the smallest singular value of $A ^ { - \top } \otimes A ^ { - \top }$ , we have + +$$ +\sigma _ { \operatorname* { m i n } } ( A ^ { - \top } \otimes A ^ { - \top } ) = \sigma _ { \operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) = { \frac { 1 } { \| A \| ^ { 2 } } } \geq { \frac { 1 } { P _ { 1 } ^ { 2 } } } . +$$ + +Thus, we have $\| \bar { Q } \| \leq \sqrt { 2 } P _ { 1 } ^ { 2 }$ , which implies $\| Q \| \leq \sqrt { 2 } P _ { 1 } ^ { 2 }$ . + +Now, let’s prove that the diagonal elements of $D _ { X } D _ { Y } ^ { - 1 }$ are well-separated. Let $q _ { i } ^ { \top }$ be the $i$ -th row vector of $Q$ . Then we know the $i$ -th diagonal element of $D _ { X } D _ { Y } ^ { - 1 }$ is $\frac { \langle q _ { i } , R \zeta _ { 1 } \rangle } { \langle q _ { i } , R \zeta _ { 2 } \rangle }$ . Since $\| Q \| \leq \sqrt { 2 } P _ { 1 } ^ { 2 }$ , we have $\| q _ { i } \| \leq \sqrt { 2 } P _ { 1 } ^ { 2 }$ for every row vector. + +It’s not hard to show that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , we have $| \langle q _ { i } , R \zeta _ { 2 } \rangle | ~ \leq$ $\mathrm { p o l y } ( d , P _ { 1 } )$ for each $i$ . Now given $\zeta _ { 2 }$ for which this happens, we have $\begin{array} { r } { \frac { \left. q _ { i } , R \zeta _ { 1 } \right. } { \left. q _ { i } , R \zeta _ { 2 } \right. } - \frac { \left. q _ { j } , R \zeta _ { 1 } \right. } { \left. q _ { j } , R \zeta _ { 2 } \right. } = } \end{array}$ $c _ { i } \langle q _ { i } , R \zeta _ { 1 } \rangle - c _ { j } \langle q _ { j } , R \zeta _ { 1 } \rangle$ , where $c _ { i } , c _ { j }$ have magnitude as least pol $\prime ( 1 / d , 1 / P _ { 1 } )$ . Since $\sigma _ { m i n } ( Q ) \geq$ $\beta ^ { 2 }$ , we know $\| \mathrm { P r o j } _ { q _ { j } ^ { \perp } } q _ { i } \| \ge \beta ^ { 2 }$ (because otherwise there exists $\lambda$ such that $\| ( e _ { i } + \lambda e _ { j } ) \| \sigma _ { m i n } ( Q ) \leq$ $\| ( e _ { i } + \lambda e _ { j } ) ^ { \top } Q \| = \| \mathrm { P r o j } _ { q _ { j } ^ { \bot } } q _ { i } \| < \beta ^ { 2 }$ , which is a contradiction). Let $q _ { i , j } ^ { \perp } = \mathrm { P r o j } _ { q _ { j } ^ { \perp } } q _ { i } = q _ { i } - \lambda _ { i , j } q _ { j }$ , we can rewrite this as + +$$ +\frac { \langle q _ { i } , R \zeta _ { 1 } \rangle } { \langle q _ { i } , R \zeta _ { 2 } \rangle } - \frac { \langle q _ { j } , R \zeta _ { 1 } \rangle } { \langle q _ { j } , R \zeta _ { 2 } \rangle } = c _ { i } \langle q _ { i } , R \zeta _ { 1 } \rangle - c _ { j } \langle q _ { j } , R \zeta _ { 1 } \rangle = c _ { i } \langle q _ { i , j } ^ { \perp } , R \zeta _ { 1 } \rangle - ( c _ { j } + \lambda _ { i , j } c _ { i } ) \langle q _ { j } , R \zeta _ { 1 } \rangle . +$$ + +By properties of Gaussians, we know $\langle q _ { i , j } ^ { \perp } , R \zeta _ { 1 } \rangle$ is independent of $\langle q _ { j } , R \zeta _ { 1 } \rangle$ , so we can first fix $\langle q _ { j } , R \zeta _ { 1 } \rangle$ and apply anti-concentration of Gaussians (see Lemma 38) to $\langle q _ { i , j } ^ { \perp } , R \zeta _ { 1 } \rangle$ . As a result we know with probability at least $1 - \delta / k ^ { 2 }$ : + +$$ +\Big | \frac { \langle q _ { i } , R \zeta _ { 1 } \rangle } { \langle q _ { i } , R \zeta _ { 2 } \rangle } - \frac { \langle q _ { j } , R \zeta _ { 1 } \rangle } { \langle q _ { j } , R \zeta _ { 2 } \rangle } \Big | \geq \mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \beta , \delta ) . +$$ + +By union bound, we know with probability at least $1 - \delta$ , + +$$ +\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) \geq \mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \beta , \delta ) . +$$ + +Let $\hat { X } \ = \ \hat { S } \zeta _ { 1 }$ and $\hat { Y } \ = \ \hat { S } \zeta _ { 2 }$ . Next, we prove that the eigenvectors of $\hat { X } \hat { Y } ^ { - 1 }$ are close to the eigenvectors of $X Y ^ { - 1 }$ . + +Lemma 12. Suppose that $\begin{array} { r c l } { \| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \| _ { F } } & { \leq } & { \epsilon , \| A \| } \\ & { } & { \geq } \end{array} \leq \epsilon , \| A \| \ \leq \ { P } _ { 1 } , \| \xi \| \ \leq \ P _ { 2 } , \sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \ \geq$ $\gamma , \sigma _ { \operatorname* { m i n } } ( A ) ~ \geq ~ \beta .$ . Let $\hat { X } \ = \ m a t ^ { * } ( \hat { S } \zeta _ { 1 } ) , \hat { Y } \ = \ m a t ^ { * } ( \hat { S } \zeta _ { 2 } )$ , where $\zeta _ { 1 }$ and $\zeta _ { 2 }$ are two independent standard Gaussian vectors. Let $z _ { 1 } , \cdots z _ { k }$ be the normalized row vectors of $A ^ { - 1 }$ . Let $\hat { z } _ { 1 } , . . . , \hat { z } _ { k }$ be the eigenvectors of $\hat { X } \hat { Y } ^ { - 1 }$ (after sign flip). For any $\delta > 0$ and small enough , with $O ( \frac { ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( d / \delta ) } { \epsilon ^ { 2 } } )$ ) number of i.i.d. samples in $\hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y ]$ , with probability at least $1 - \delta$ over the randomness of $\zeta _ { 1 } , \zeta _ { 2 }$ and i.i.d. samples, there exists a permutation $\pi ( i ) \in [ k ]$ such that + +$$ +\begin{array} { r } { \| \hat { z } _ { i } - z _ { \pi [ i ] } \| \le p o l y ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) . } \end{array} +$$ + +for any $1 \leq i \leq k$ . + +Proof. Let $z _ { 1 } ^ { \prime } , \cdots , z _ { k } ^ { \prime }$ be the eigenvectors of $X Y ^ { - 1 }$ (before sign flip step). Similarly define $\hat { z } _ { 1 } ^ { \prime } , \cdots , \hat { z } _ { k } ^ { \prime }$ for $\hat { X } \hat { Y } ^ { - 1 }$ . We first prove that the eigenvectors of $\hat { X } \hat { Y } ^ { - 1 }$ are close to the eigenvectors of $X Y ^ { - 1 }$ + +Let ${ \hat { X } } = X + E _ { X }$ and $\hat { Y } = Y + E _ { Y }$ . Then we have + +$$ +\hat { X } \hat { Y } ^ { - 1 } = X Y ^ { - 1 } ( I + F ) + G , +$$ + +where $F = - E _ { Y } ( I + Y ^ { - 1 } E _ { Y } ) ^ { - 1 } Y ^ { - 1 } $ and $G = E _ { X } \hat { Y } ^ { - 1 }$ . According to Lemma 34, we have $\begin{array} { r } { \| \boldsymbol { F } \| \le \frac { \| E _ { Y } \| } { \sigma _ { \operatorname* { m i n } } ( Y ) - \| E _ { Y } \| } } \end{array}$ and $\begin{array} { r } { \| G \| \le \frac { \| E _ { X } \| } { \sigma _ { \operatorname* { m i n } } ( \hat { Y } ) } } \end{array}$ . In order to bound the perturbation matrices $\| F \|$ and $\| G \|$ , we need to first bound $\| E _ { X } \| , \| E _ { Y } \|$ and $\sigma _ { \mathrm { m i n } } ( Y ) , \sigma _ { \mathrm { m i n } } ( \hat { Y } )$ . + +As we know, $E _ { X } = \hat { X } - X = ( \hat { S } - S R ) \zeta _ { 1 }$ . According to Lemma 16, we have $\| \hat { S } - S R \| \le$ $\| \hat { S } - S R \| _ { F } \leq 2 \epsilon$ . We also know with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , $\| \zeta _ { 1 } \| \le \mathsf { p o l y } ( d )$ . Thus, we have + +$$ +\| E _ { X } \| = \| ( \hat { S } - S R ) \zeta _ { 1 } \| \leq \| \hat { S } - S R \| \| \zeta _ { 1 } \| \leq \mathrm { p o l y } ( \epsilon , d ) . +$$ + +Similarly, with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , we also know $\| E _ { Y } \| \le \mathtt { p o l y } ( \epsilon , d )$ + +Now, we lower bound the smallest singular value of $X$ and $Y$ . Since $X = A ^ { - \top } D _ { X } A ^ { - 1 }$ , we have + +$$ +\begin{array} { r l } & { { \sigma } _ { \operatorname* { m i n } } ( X ) \geq { \sigma } _ { \operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) { \sigma } _ { \operatorname* { m i n } } ( D _ { X } ) } \\ & { \qquad = \displaystyle \frac { 1 } { \| A \| ^ { 2 } } { \sigma } _ { \operatorname* { m i n } } ( D _ { X } ) } \\ & { \qquad \geq \displaystyle \frac { 1 } { P _ { 1 } ^ { 2 } } { \sigma } _ { \operatorname* { m i n } } ( D _ { X } ) . } \end{array} +$$ + +Since $D _ { X }$ is a diagonal matrix, its smallest singular value equals the smallest absolute value of its diagonal element. Recall each diagonal element of $D _ { X }$ is $\langle q _ { i } , R \zeta _ { 1 } \rangle$ , which follows a Gaussian distribution whose standard deviation is at least $\left\| q _ { i } \right\| \ge \beta ^ { 2 }$ . By anti-concentration property of Gaussian (see Lemma 38), we know $| \langle q _ { i } , R \zeta _ { 2 } \rangle | \ge \Omega ( \delta \beta ^ { 2 } / k )$ for all $i$ with probability $\bar { 1 } - \bar { \delta } / 4$ . Thus, we have $\sigma _ { \operatorname* { m i n } } ( X ) \geq \mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \beta , \delta )$ . Similarly we have the same conclusion for $Y$ . For small enough $E _ { Y }$ , we have $\sigma _ { \operatorname* { m i n } } ( \hat { Y } ) \geq \sigma _ { \operatorname* { m i n } } ( Y ) - \| E _ { Y } \|$ . + +Thus, for small enough $\epsilon$ , we have $\begin{array} { r l r } { \| { \cal F } \| } & { { } \le } & { \mathrm { p o l y } ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) _ { . } } \end{array}$ and $\| G \| \quad \leq$ $\mathrm { p o l y } ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta )$ . In order to apply Lemma 33, we also need to bound $\kappa ( \boldsymbol { A } ^ { - \top } )$ and $\| X Y ^ { - 1 } \|$ . Since $\textstyle \sigma _ { \operatorname* { m i n } } ( { \dot { A } } ^ { - \top } ) \geq { \frac { 1 } { P _ { 1 } } }$ and $\| A ^ { - \top } \| \leq 1 / \beta$ , we have $\kappa ( A ^ { - \top } ) \leq P _ { 1 } / \beta$ . For the norm of $X Y ^ { - 1 }$ we have + +$$ +\lVert X Y ^ { - 1 } \rVert \leq \frac { \lVert X \rVert } { \sigma _ { \operatorname* { m i n } } ( Y ) } \leq \lVert X \rVert \mathrm { p o l y } ( d , P _ { 1 } , 1 / \beta , 1 / \delta ) , +$$ + +where the second inequality holds because $\sigma _ { \operatorname* { m i n } } ( Y ) \geq \mathrm { { p o l y } } ( 1 / d , 1 / P _ { 1 } , \beta , \delta )$ . Recall that $X =$ $\mathrm { m a t } ^ { * } ( S R \zeta _ { 1 } )$ . It’s not hard to verify that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , we have $\| X \| \leq$ poly $( d )$ . Thus, we know $\| X Y ^ { - \bar { 1 } } \| \le \mathrm { p o l y } \bar { ( } d , P _ { 1 } , 1 / \bar { \beta } , 1 / \delta )$ . Similarly, we can also prove that $\| D _ { X } D _ { Y } ^ { - 1 } \| \le \mathrm { p o l y } ( d , P _ { 1 } , 1 / \beta , 1 / \delta )$ + +Overall, we have + +$$ +\begin{array} { r l } { \mathfrak { s } ( A ^ { - \top } ) ( \| X Y ^ { - 1 } F \| + \| G \| ) \le \kappa ( A ^ { - \top } ) ( \| X Y ^ { - 1 } \| \| F \| + \| G \| ) } & { } \\ & { \le \frac { P _ { 1 } } { \beta } \Big ( \mathtt { p o l y } ( d , P _ { 1 } , 1 / \beta , 1 / \delta ) \mathrm { p o l y } ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) + \mathtt { p o l y } ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) } \\ & { \le \mathtt { p o l y } ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) . } \end{array} +$$ + +According to Lemma 17, we know with probability at least $1 \mathrm { ~ - ~ } \delta / 4$ , $\begin{array} { r l } { \mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) } & { { } \geq } \end{array}$ $\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \beta , \delta )$ . Thus, by union bound, we know for small enough $\epsilon$ , with probability at least $1 - \delta$ , + +$$ +\kappa ( A ^ { - \top } ) ( \| X Y ^ { - 1 } F \| + \| G \| ) < \mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) / ( 2 k ) . +$$ + +According to Lemma 33, we know there exists a permutation $\pi [ i ] \in [ k ]$ , such that + +$$ +\begin{array} { r l } & { \| \hat { z } _ { i } ^ { \prime } - z _ { i } ^ { \prime } \| \leq 3 \frac { \| F \| \| D _ { X } D _ { Y } ^ { - 1 } \| + \| G \| } { \sigma _ { \operatorname* { m i n } } \left( A ^ { - \top } \right) \operatorname { s e p } \left( D _ { X } D _ { Y } ^ { - 1 } \right) } } \\ & { \qquad \leq 3 \frac { \mathrm { p o l y } \left( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta \right) \mathrm { p o l y } \left( d , P _ { 1 } , 1 / \beta , 1 / \delta \right) + \mathrm { p o l y } \left( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta \right) } { 1 / P _ { 1 } \mathrm { p o l y } \left( 1 / d , 1 / P _ { 1 } , \beta , 1 / \delta \right) } } \\ & { \qquad \leq \mathrm { p o l y } ( d , P _ { 1 } , 1 / \beta , \epsilon , 1 / \delta ) . } \end{array} +$$ + +with probability at least $1 - \delta$ + +According to Lemma 5, the eigenvectors of $X Y ^ { - 1 }$ (after sign flip) are exactly the normalized rows of $A ^ { - 1 }$ (up to permutation). Now the only issue is the sign of $\hat { z } _ { i } ^ { \prime }$ . By the robustness of sign flip step (see Lemma 18), we know for small enough $\epsilon$ , with $O ( \frac { ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( d / \delta ) } { \epsilon ^ { 2 } } )$ number of i.i.d. samples in $\hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y ]$ , with probability at least $1 - \delta$ , the sign flip of $\hat { z } _ { i } ^ { \prime }$ is consistent with the sign flip of $z _ { i } ^ { \prime }$ . □ + +In the following lemma, we show that the sign flip step of $\hat { z } _ { i }$ is robust. + +Lemma 18. Suppose that $\| x \| \leq \Gamma , \| A \| \leq P _ { 1 } , \| \xi \| \leq P _ { 2 }$ . Let $z _ { 1 } ^ { \prime } , \cdots , z _ { k } ^ { \prime }$ be the eigenvectors of $X Y ^ { - 1 }$ (before sign flip step). Similarly define $\hat { z } _ { 1 } ^ { \prime } , \cdots , \hat { z } _ { k } ^ { \prime }$ for $\hat { X } \hat { Y } ^ { - 1 }$ . Suppose for each i, $\| z _ { i } ^ { \prime } { - } \hat { z } _ { i } ^ { \prime } \| \leq$ , where $\begin{array} { r } { \epsilon \le \frac { \beta \gamma } { 4 \Gamma \left( 1 + \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } \right) } } \end{array}$ . We know, for any $\delta < 1$ , with $O ( \frac { ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( d / \delta ) } { \epsilon ^ { 2 } } )$ number of i.i.d. samples, + +$$ +\operatorname* { P r } \left[ s i g n ( \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] ) \neq s i g n ( \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] ) \right] \leq \delta . +$$ + +Proof. We first show that $\mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ]$ is bounded away from zero. Let $Z ^ { \prime }$ be a $k \times k$ matrix, whose rows are $\{ z _ { i } ^ { \prime } \}$ . Without loss of generality, assume that $Z ^ { \prime } = \mathrm { d i a g } ( \pm \lambda ) A ^ { - 1 }$ . Since $\| A ^ { - 1 } \| \le 1 / \beta$ , we know $\lambda _ { i } \geq \beta$ , for each $i$ . Thus, we have + +$$ +\begin{array} { r } { | \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] | = \lambda _ { i } \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ] \geq \beta \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ] . } \end{array} +$$ + +In order to lowerbound $\mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ]$ , let’s first look at $\mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) x ^ { \top } ]$ . + +$$ +\begin{array} { r l } { \| \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) x ^ { \top } ] \| } & { = \displaystyle \frac { 1 } { 2 } \| \mathbb { E } [ w _ { i } ^ { \top } x x ^ { \top } ] \| } \\ & { \qquad \geq \displaystyle \frac { 1 } { 2 } \| w _ { i } \| \sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) } \\ & { \qquad \geq \displaystyle \frac { \gamma } { 2 } . } \end{array} +$$ + +Now, let’s connect $\| \mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) x ^ { \top } ] \|$ with $\mathbb { E } [ \sigma ( w _ { i } ^ { \top } x ) ]$ . + +$$ +\begin{array} { r l } & { \| \mathbb { E } [ \sigma ( \boldsymbol { w } _ { i } ^ { \top } \boldsymbol { x } ) \boldsymbol { x } ^ { \top } ] \| \le \mathbb { E } [ \| \sigma ( \boldsymbol { w } _ { i } ^ { \top } \boldsymbol { x } ) \boldsymbol { x } ^ { \top } \| ] } \\ & { ~ = \mathbb { E } [ \sigma ( \boldsymbol { w } _ { i } ^ { \top } \boldsymbol { x } ) \| \boldsymbol { x } \| ] } \\ & { ~ \le \Gamma \mathbb { E } [ \sigma ( \boldsymbol { w } _ { i } ^ { \top } \boldsymbol { x } ) ] . } \end{array} +$$ + +Thus, we have $\begin{array} { r } { \mathbb E [ \sigma ( w _ { i } ^ { \top } x ) ] \ge \frac { \gamma } { 2 \Gamma } } \end{array}$ , and further $\begin{array} { r } { | \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] | \ge \frac { \beta \gamma } { 2 \Gamma } } \end{array}$ . + +Now, let’s bound $\| \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] - \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] \|$ . + +$$ +\begin{array} { r l } & { \| \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] - \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] \| = \| \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] - \mathbb { E } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] + \mathbb { E } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] - \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] \| } \\ & { \qquad \leq \| \mathbb { E } [ \langle z _ { i } ^ { \prime } - \hat { z } _ { i } ^ { \prime } , y \rangle ] \| + \| \mathbb { E } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] - \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] \| } \\ & { \qquad \leq ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) \epsilon + \| \mathbb { E } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] - \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] \| . } \end{array} +$$ + +Note that we reserve fresh samples for this step, thus $\hat { z } _ { i } ^ { \prime }$ is independent with samples in $\hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] $ . Since $\| \langle \hat { z } _ { i } ^ { \prime } , y \rangle \| \le \Gamma P _ { 1 } \sqrt { k } + P _ { 2 }$ , we know with $O ( \frac { ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) ^ { 2 } \log ( d / \delta ) } { \epsilon ^ { 2 } } )$ i number of samples, we have + +$$ +\begin{array} { r } { \| \mathbb { E } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] - \mathbb { E } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] ] \| \leq \epsilon . } \end{array} +$$ + +Overall, we have $| \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] - \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] ] | \leq ( 1 + \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) \epsilon$ . Combined with the fact that $\begin{array} { r } { | \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] | \ge \frac { \beta \gamma } { 2 \Gamma } } \end{array}$ , we know as long as ≤ βγ4Γ(1+ΓP1√k+P2) , with O( (ΓP1√k+P2)2 log(d/δ)2 ) number of samples, we have + +$$ +\operatorname* { P r } [ \operatorname { s i g n } ( \mathbb { E } [ \langle z _ { i } ^ { \prime } , y \rangle ] ) \neq \operatorname { s i g n } ( \hat { \mathbb { E } } [ \langle \hat { z } _ { i } ^ { \prime } , y \rangle ] ) ] \leq \delta . +$$ + +# B.3 ROBUST ANALYSIS FOR RECOVERING FIRST LAYER WEIGHTS + +We will first show that Algorithm 1 is robust. + +Theorem 8. Assume that $\| x \| \leq \Gamma , \| w \| \leq 1 , | \xi | \leq P _ { 2 }$ and $\sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \geq \gamma .$ . Then for any $\epsilon \leq \gamma / 2$ , for any $1 > \delta > 0$ , given $\begin{array} { r } { O ( \frac { ( \Gamma ^ { 2 } + P _ { 2 } \Gamma ) ^ { 4 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of i.i.d. samples, we know with probability at least $1 - \delta$ , + +$$ +\| \hat { w } - w \| \leq \epsilon , +$$ + +where $\hat { w }$ is the learned weight vector. + +Proof. We first show that given polynomial number of i.i.d. samples, $\| \hat { \mathbb { E } } [ y x ] - \mathbb { E } [ y x ] \|$ is upper bounded with high probability, where ${ \hat { \mathbb { E } } } [ y x ]$ is the empirical estimate of $\mathbb { E } [ y x ]$ . Due to the assumption that $\| x \| \leq \bar { \Gamma } , \| w \| \leq 1 , \| \xi \| \leq P _ { 2 }$ , we have + +$$ +\begin{array} { r l } & { \| y x \| = \| ( \sigma ( w ^ { \top } x ) + \xi ) x \| } \\ & { \qquad \leq \| w ^ { \top } x x \| + \| \xi x \| } \\ & { \qquad \leq \| w \| \| x \| ^ { 2 } + | \xi | \| x \| } \\ & { \qquad \leq \Gamma ^ { 2 } + P _ { 2 } \Gamma } \end{array} +$$ + +According to Lemma 24, we know given ( (Γ2+P2Γ)2 log( dδ )2 ) number of samples, with probability at least $1 - \delta$ , we have $\| \hat { \mathbb { E } } [ y x ] - \mathbb { E } [ y x ] \| \le \epsilon$ . + +Since $\| x x ^ { \top } \| \leq \Gamma ^ { 2 }$ , we know that given $O \big ( \frac { \Gamma ^ { 4 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } \big )$ number of samples, $\| \hat { \mathbb { E } } [ x x ^ { \top } ] - \mathbb { E } [ x x ^ { \top } ] \| \leq \epsilon$ with probability at least $1 - \delta$ . Suppose that $\epsilon \leq \gamma / 2 \leq \sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) / 2$ , we know $\hat { \mathbb { E } } [ x x ^ { \top } ]$ has full rank. According to Lemma 29, we have + +$$ +\left\| \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] ^ { - 1 } - \mathbb { E } \big [ x x ^ { \top } \big ] ^ { - 1 } \right\| \leq 2 \sqrt { 2 } \frac { \left\| \hat { \mathbb { E } } \big [ x x ^ { \top } \big ] - \mathbb { E } \big [ x x ^ { \top } \big ] \right\| } { \sigma _ { \operatorname* { m i n } } ^ { 2 } ( \mathbb { E } [ x x ^ { \top } ] ) } \leq 2 \sqrt { 2 } \epsilon / \gamma ^ { 2 } , +$$ + +with probability at least $1 - \delta$ . + +By union bound, probability at least ow for any , we have $\epsilon \leq \gamma / 2$ , given $O ( \frac { ( \Gamma ^ { 2 } + P _ { 2 } \Gamma ) ^ { 2 } \log ( \frac { d } { \delta } ) } { \epsilon ^ { 2 } } )$ number of samples, with $1 - \delta$ + +$$ +\begin{array} { r l } & { \| \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } - \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \| \le 2 \sqrt { 2 } \epsilon / \gamma ^ { 2 } } \\ & { \| \hat { \mathbb { E } } [ y x ] - \mathbb { E } [ y x ] \| \le \epsilon } \end{array} +$$ + +Denote + +$$ +\begin{array} { r l } & { E _ { 1 } : = \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } - \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } } \\ & { E _ { 2 } : = \hat { \mathbb { E } } [ y x ] - \mathbb { E } [ y x ] . } \end{array} +$$ + +Then, we have + +$$ +\begin{array} { r l } & { \| \hat { w } - w \| = 2 \| \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \hat { \mathbb { E } } [ y x ] - \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ y x ] \| } \\ & { \qquad \leq 2 \| E _ { 1 } \| \| E _ { 2 } \| + 2 \| E _ { 1 } \| \| \mathbb { E } [ y x ] \| + 2 \| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \| \| E _ { 2 } \| } \\ & { \qquad \leq \frac { 4 \sqrt { 2 } \epsilon ^ { 2 } } { \gamma ^ { 2 } } + \frac { 4 \sqrt { 2 } \left( \Gamma ^ { 2 } + P _ { 2 } \Gamma \right) \epsilon } { \gamma ^ { 2 } } + \frac { 2 \epsilon } { \gamma } } \\ & { \qquad \leq O ( \frac { ( \Gamma ^ { 2 } + P _ { 2 } \Gamma ) \epsilon } { \gamma ^ { 2 } } ) . } \end{array} +$$ + +Thus, given $\begin{array} { r } { O ( \frac { ( \Gamma ^ { 2 } + P _ { 2 } \Gamma ) ^ { 4 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of samples, with probability at least $1 - \delta$ , we have + +$$ +\| { \hat { w } } - w \| \leq \epsilon . +$$ + +Now let’s go back to the call to Algorithm 1 in Algorithm 3. Let $z _ { i }$ ’s be the normalized rows of $A ^ { - 1 }$ , and let $\hat { z } _ { i }$ ’s be the eigenvectors of $\hat { X } \hat { Y } ^ { - 1 }$ (with correct sign). From Lemma 12, we know $\left\{ \hat { z } _ { i } \right\}$ are close to $\left\{ z _ { i } \right\}$ with permutation. Without loss of generality, we assume the permutation here is just an identity mapping, which means $\| z _ { i } - \hat { z } _ { i } \|$ is small for each $i$ . + +For each $z _ { i }$ , let $v _ { i }$ be the output of Algorithm 1 given infinite number of inputs $( x , z _ { i } ^ { \top } y )$ . For each $\hat { z } _ { i }$ , let $\hat { v } _ { i }$ be the output of Algorithm 1 given only finite number of samples $( x , \hat { z } _ { i } ^ { \top } y )$ . In this section, we show that suppose $\| z _ { i } - \hat { z } _ { i } \|$ is bounded, with polynomial number of samples, $\Vert { v } _ { i } - \hat { v } _ { i } \Vert$ is also bounded. + +The input for Algorithm 1 is $( x , \hat { z } _ { i } ^ { \top } y )$ . We view $\hat { z } _ { i } ^ { \top } y$ as the summation of $z _ { i } ^ { \top } y$ and a noise term $\left( \hat { z } _ { i } - z _ { i } \right) ^ { \top } y$ . Here, the issue is that the noise term $\left( \hat { z } _ { i } - z _ { i } \right) ^ { \top } y$ is not independent with the sample $( x , \hat { z } _ { i } ^ { \top } y )$ , which makes the robust analysis in Theorem 8 not applicable. On the other hand, since we reserve a separate set of samples for Algorithm 1, the estimate $\hat { z } _ { i }$ is independent with the samples $( x , y )$ ’s used by Algorithm 1. Thus, the samples $( x , \hat { z _ { i } } ^ { \top } y )$ ’s here are still i.i.d., which enables us to use matrix concentration bounds to show the robustness here. + +Lemma 13. Assume that $\| x \| \leq \Gamma , \| A \| \leq P _ { 1 } , \| \xi \| \leq P _ { 2 }$ and $\sigma _ { \operatorname* { m i n } } ( \mathbb { E } [ x x ^ { \top } ] ) \geq \gamma$ . Suppose that for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any  ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ42 ) number of samples for Algorithm $^ { l }$ , we know with probability at least $1 - \delta$ , + +$$ +\| v _ { i } - \hat { v } _ { i } \| \leq \frac { 2 \tau ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) \Gamma } { \gamma } + 2 \epsilon , +$$ + +for each $1 \leq i \leq k$ . + +Proof. For any $i$ , let’s bound $\| v _ { i } \ - \hat { v } _ { i } \|$ . As we know, $\begin{array} { r } { \boldsymbol { v } _ { i } ~ = ~ 2 { \mathbb E } [ \boldsymbol { x } \boldsymbol { x } ^ { \top } ] ^ { - 1 } { \mathbb E } [ z _ { i } ^ { \top } \boldsymbol { y } \boldsymbol { x } ] } \end{array}$ and $\begin{array} { r l } { \hat { v } _ { i } } & { { } = } \end{array}$ $2 \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y x ]$ . Thus, in order to bound $\Vert { v } _ { i } - \hat { v } _ { i } \Vert$ , we only need to show + +$$ +\left| \left| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { z } _ { i } ^ { \top } y x ] - \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ z _ { i } ^ { \top } y x ] \right| \right| \mathrm { ~ a n d ~ } \left| \left| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { z } _ { i } ^ { \top } y x ] - \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y x ] \right| \right| +$$ + +are both bounded. + +The first term can be bounded as follows. + +$$ +\begin{array} { r l } { \left\| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { z } _ { i } ^ { \top } y x ] - \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ z _ { i } ^ { \top } y x ] \right\| } & { = \left\| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ ( \hat { z } _ { i } - z _ { i } ) ^ { \top } y x ] \right\| } \\ & { \leq \left\| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \right\| \left\| \hat { z } _ { i } - z _ { i } \right\| \left\| A \sigma ( W x ) + \xi \right\| \left\| x \right\| } \\ & { \leq \frac { \tau ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) \Gamma } { \gamma } } \end{array} +$$ + +We can use standard matrix concentration bounds to upper bound the second term. By similar analysis of Theorem 1, we know given $\begin{array} { r } { O ( \frac { ( \Gamma ^ { 2 } + P _ { 2 } \Gamma ) ^ { 4 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of i.i.d. samples, with probability at least $1 - \delta$ , + +$$ +\begin{array} { r } { \big \| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { z } _ { i } ^ { \top } y x ] - \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y x ] \big \| \leq \epsilon . } \end{array} +$$ + +Overall, we have + +$$ +\begin{array} { r l } & { v _ { i } - \hat { v } _ { i } \| = \left\| 2 \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ z _ { i } ^ { \top } y x ] - 2 \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y x ] \right\| } \\ & { \qquad \leq 2 \big \| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { z } _ { i } ^ { \top } y x ] - \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ z _ { i } ^ { \top } y x ] \big \| + 2 \big \| \mathbb { E } [ x x ^ { \top } ] ^ { - 1 } \mathbb { E } [ \hat { z } _ { i } ^ { \top } y x ] - \hat { \mathbb { E } } [ x x ^ { \top } ] ^ { - 1 } \hat { \mathbb { E } } [ \hat { z } _ { i } ^ { \top } y x ] } \\ & { \qquad \leq \frac { 2 \tau \big ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } \big ) \Gamma } { \gamma } + 2 \epsilon . } \end{array} +$$ + +By union bound, we know given $\begin{array} { r } { O ( \frac { ( \Gamma ^ { 2 } + P _ { 2 } \Gamma ) ^ { 4 } \log ( \frac { d } { \delta } ) } { \gamma ^ { 4 } \epsilon ^ { 2 } } ) } \end{array}$ number of i.i.d. samples, with probability at least $1 - \delta$ , + +$$ +\| v _ { i } - \hat { v } _ { i } \| \leq \frac { 2 \tau ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) \Gamma } { \gamma } + 2 \epsilon . +$$ + +for any $1 \leq i \leq k$ . + +# B.4 PROOF OF THEOREM 7 + +Proof of Theorem 7. Combining Lemma 11, Lemma 12 and Lemma 13, we know given p $\mathrm { o l y } \big ( \Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \epsilon , 1 / \gamma , 1 / \alpha , 1 / \bar { \beta } , 1 / \delta \big )$ number of i.i.d. samples, with probability at least $1 - \delta$ , + +$$ +\| z _ { i } - \hat { z } _ { i } \| \leq \epsilon , \| v _ { i } - \hat { v } _ { i } \| \leq \epsilon +$$ + +for each $1 \leq i \leq k$ . + +Let $V$ be a $k \times d$ matrix whose rows are $v _ { i }$ ’s. Similarly define matrix $\hat { V }$ for $\hat { v } _ { i }$ ’s. Since $\lVert { v } _ { i } - \hat { v } _ { i } \rVert \leq \epsilon$ for any $i$ , we know every row vector of $V - { \hat { V } }$ has norm at most $\epsilon$ , which implies $\| V - \hat { V } \| \leq \sqrt { k } \epsilon$ . + +Let $Z$ be a $k \times k$ matrix whose rows are $z _ { i }$ ’s. Similarly define matrix $\hat { Z }$ for $\hat { z } _ { i }$ ’s. Again, we have $\| Z - \hat { Z } \| \leq \sqrt { k } \epsilon$ . In order to show $\lVert Z ^ { - 1 } - \hat { Z } ^ { - 1 } \rVert$ is small using standard matrix perturbation bounds (Lemma 29), we need to lower bound $\sigma _ { \mathrm { m i n } } ( Z )$ . Notice that $Z$ is just matrix $A ^ { - 1 }$ with normalized row vectors. As we know, $\sigma _ { \mathrm { m i n } } ( A ^ { - 1 } ) \ge 1 / \dot { P _ { 1 } }$ , and $\| A ^ { - 1 } \| \le 1 \mathsf { \bar { / } } \beta$ , which implies that every row vector of $A ^ { - 1 }$ has norm at most $1 / \beta$ . Let $D _ { z }$ be the diagonal matrix whose $i$ , $i$ -th entry is the norm of $i$ -th row of $A ^ { - 1 }$ , then $Z = D _ { z } ^ { - 1 } A ^ { - 1 }$ , and we know $\bar { \sigma _ { m i n } } ( Z ) \geq \sigma _ { m i n } ( D _ { z } ^ { - 1 } ) \sigma _ { m i n } ( \bar { A ^ { - 1 } } ) \geq \beta / P _ { 1 }$ . + +Then, according to Lemma 29, as long as $\begin{array} { r } { \epsilon \le \frac { \beta } { 2 P _ { 1 } } } \end{array}$ , we have + +$$ +\| Z ^ { - 1 } - \hat { Z } ^ { - 1 } \| \leq 2 \sqrt { 2 } \frac { \| Z - \hat { Z } \| } { \sigma _ { \operatorname* { m i n } } ^ { 2 } ( Z ) } \leq 2 \sqrt { 2 } P _ { 1 } ^ { 2 } \sqrt { k } \epsilon / \beta ^ { 2 } . +$$ + +Define + +$$ +\begin{array} { l } { E _ { 1 } : = Z ^ { - 1 } - \hat { Z } ^ { - 1 } } \\ { E _ { 2 } : = V - \hat { V } . } \end{array} +$$ + +We know $\| E _ { 1 } \| \le 2 \sqrt { 2 } P _ { 1 } ^ { 2 } \sqrt { k } \epsilon / \beta ^ { 2 }$ and $\| E _ { 2 } \| \le \sqrt { k } \epsilon$ . In order to bound $\| V \|$ , we can bound the norm of its row vectors. We have, + +$$ +\begin{array} { r l } & { \| v _ { i } \| = \| 2 \mathbb E [ x x ^ { \top } ] ^ { - 1 } \mathbb E [ z _ { i } ^ { \top } y x ] \| } \\ & { ~ \leq \frac { 2 \Gamma ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) } { \gamma } , } \end{array} +$$ + +which implies $\begin{array} { r } { \| V \| \le \frac { 2 \sqrt { k } \Gamma ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) } { \gamma } } \end{array}$ . Now we can bound $\| Z ^ { - 1 } \sigma ( V x ) - \hat { Z } ^ { - 1 } \sigma ( \hat { V } x ) \|$ as follows. + +$$ +\begin{array} { r l } & { \| Z ^ { - 1 } \sigma ( V x ) - \hat { Z } ^ { - 1 } \sigma ( \hat { V } x ) \| \le \| E _ { 1 } \| \| E _ { 2 } x \| + \| E _ { 1 } \| \| V x \| + \| Z ^ { - 1 } \| \| E _ { 2 } x \| } \\ & { \qquad \le \frac { 2 \sqrt { 2 } P _ { 1 } ^ { 2 } \Gamma k \epsilon ^ { 2 } } { \beta ^ { 2 } } + \frac { 4 \sqrt { 2 } P _ { 1 } ^ { 2 } \Gamma ^ { 2 } ( \Gamma P _ { 1 } \sqrt { k } + P _ { 2 } ) k \epsilon } { \beta ^ { 2 } \gamma } + \frac { P _ { 1 } \Gamma \sqrt { k } \epsilon } { \beta } , } \end{array} +$$ + +where the first inequality holds since $\| \sigma ( V x ) \| \leq \| V x \|$ and $\| \sigma ( { \hat { V } } x ) - \sigma ( V x ) \| \leq \| { \hat { V } } x - V x \| .$ + +Thus, we know given poly $\left( \Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \epsilon , 1 / \gamma , 1 / \alpha , 1 / \beta , 1 / \delta \right)$ number of i.i.d. samples, with probability at least $1 - \delta$ , + +$$ +\lVert A \boldsymbol { \sigma } ( W \boldsymbol { x } ) - \hat { Z } ^ { - 1 } \boldsymbol { \sigma } ( \hat { V } \boldsymbol { x } ) \rVert = \lVert Z ^ { - 1 } \boldsymbol { \sigma } ( V \boldsymbol { x } ) - \hat { Z } ^ { - 1 } \boldsymbol { \sigma } ( \hat { V } \boldsymbol { x } ) \rVert \leq \epsilon , +$$ + +where the first equality holds because $A \sigma ( W x ) = Z ^ { - 1 } \sigma ( V x )$ , as shown in Theorem 5. + +# C SMOOTHED ANALYSIS FOR DISTINGUISHING MATRICES + +In smoothed analysis, it’s clear that after adding small Gaussian perturbations, matrix $A$ and $W$ will become robustly full rank with reasonable probability (Lemma 36). In this section, we will focus on the tricky part, using smoothed analysis framework to show that it is natural to assume the distinguishing matrix is robustly full rank. We will consider two settings. In the first case, the input distribution is the Gaussian distribution $\mathcal { N } ( 0 , I _ { d } )$ , and the weights for the first layer matrix $W$ is perturbed by a small Gaussian noise. In this case we show that the augmented distinguishing matrix $M$ has smallest singular value $\sigma _ { \operatorname* { m i n } } ( M )$ that depends polynomially on the dimension and the amount of perturbation. This shows that for the Gaussian input distribution, $\sigma _ { \operatorname* { m i n } } ( M )$ is lower bounded as long as $W$ is in general position. In the second case, we will fix a full rank weight matrix $W$ , and consider an arbitrary symmetric input distribution $\mathcal { D }$ . There is no standard way of perturbing a symmetric distribution, we give a simple perturbation $\mathcal { D } ^ { \prime }$ that can be arbitrarily close to $\mathcal { D }$ , and prove that $\sigma _ { \mathrm { m i n } } ( M ^ { D ^ { \prime } } )$ is lowerbounded. + +Perturbing $W$ for Gaussian Input We first consider the case when the input follows standard Gaussian distribution $\mathcal { N } ( 0 , I _ { d } )$ . The weight matrix $W$ is perturbed to $\widetilde { W }$ where + +$$ +\widetilde { W } = W + \rho E . +$$ + +Here $E \in \mathbb { R } ^ { k \times d }$ is a random matrix whose entries are i.i.d. standard Gaussians. We will use $\widetilde { M }$ to denote the perturbed version of the augmented distinguishing matrix $M$ . Recall that the columns of $\widetilde { M }$ has the form: + +$$ +\widetilde { M } _ { i j } = \mathbb { E } \big [ ( \widetilde { w } _ { i } ^ { \top } x ) ( \widetilde { w } _ { j } ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ \widetilde { w } _ { i } ^ { \top } x \widetilde { w } _ { j } ^ { \top } x \leq 0 \} \big ] , +$$ + +where $\widetilde { w } _ { i } ^ { \top }$ is the $i$ -th row of $\widetilde { W }$ . Also, since $\widetilde { M }$ is the augmented distinguishing matrix it has a final column $\widetilde { M } _ { 0 } = \mathrm { v e c } ( I _ { d } )$ . We show that the smallest singular value of $\widetilde { M }$ is lower bounded with high probability. + +Theorem 9. Suppose that $k \leq d / 5$ , and the input follows standard Gaussian distribution $\mathcal { N } ( 0 , I _ { d } )$ . Given any weight matrix $W$ with $\| w _ { i } \| \le \tau$ for each row vector, let $\widetilde { W }$ be a perturbed version of $W$ according to Equation (18) and $\widetilde { M }$ be the perturbed augmented distinguishing matrix. With probability at least $\therefore { \exp ( - d ^ { \Omega ( 1 ) } ) }$ , we have + +$$ +\sigma _ { \operatorname* { m i n } } ( \widetilde { M } ) \geq p o l y ( 1 / \tau , 1 / d , \rho ) . +$$ + +We will prove this Theorem in Section C.1. + +Perturbing the Input Distribution Our algorithm works for a general symmetric input distribution $\mathcal { D }$ . However, we cannot hope to get a result like Theorem 9 for every symmetric input distribution $\mathcal { D }$ . As a simple example, if $\mathcal { D }$ is just concentrated on 0, then we do not get any information about weights and the problem is highly degenerate. Therefore, we must specify a way to perturb the input distribution. + +We define a perturbation that is parametrized by a random Gaussian matrix $Q$ and a parameter $\lambda \in ( 0 , 1 )$ . The random matrix $Q$ is used to generate a Gaussian distribution $\mathcal { D } _ { Q }$ with a random covariance matrix. To sample a point in $\mathcal { D } _ { Q }$ , first sample $n \sim \mathcal { N } ( 0 , I _ { d } )$ , and then output $Q n$ . The $( Q , \lambda )$ perturbation of a distribution $\mathcal { D }$ , which we denote by $\mathcal { D } _ { Q , \lambda }$ is a mixture between the distribution $\mathcal { D }$ and the distribution $\mathcal { D } _ { Q }$ . More precisely, to sample $x$ from $\mathcal { D } _ { Q , \lambda }$ , pick $z$ as a Bernoulli random variable where $\mathrm { P r } [ z = 1 ] = \lambda$ and $\operatorname* { P r } [ z = 0 ] = 1 - \lambda$ ; pick $x ^ { \prime }$ according to $\mathcal { D }$ and pick $x ^ { \prime \prime } = Q n$ according to distribution $\mathcal { D } _ { Q }$ , then let + +$$ +x = \left\{ \begin{array} { l l } { { x ^ { \prime } } } & { { z = 0 } } \\ { { x ^ { \prime \prime } } } & { { z = 1 } } \end{array} \right. +$$ + +Intuitively, the $( Q , \lambda )$ perturbation of a distribution $\mathcal { D }$ mixes the distribution $\mathcal { D }$ with a Gaussian distribution $\mathcal { D } _ { Q }$ with covariance matrix $Q Q ^ { \top }$ . Since both $\mathcal { D }$ and $\mathcal { D } _ { Q }$ are symmetric, their mixture is also symmetric. Also, the TV-distance between $\mathcal { D }$ and $\mathcal { D } _ { Q , \lambda }$ is bounded by $\lambda$ . Throughout this section we will use $\mathcal { D } ^ { \prime }$ to denote the perturbed distribution $\mathcal { D } _ { Q , \lambda }$ + +We show that given any input distribution, after applying $( Q , \lambda )$ -perturbation with a random Gaussian matrix $Q$ , the smallest singular value of the augmented distinguishing matrix $M ^ { \mathcal { D ^ { \prime } } }$ is lower bounded. Recall that $M ^ { \mathcal { D ^ { \prime } } }$ is defined as + +$$ +\begin{array} { r } { M _ { i j } ^ { \mathcal { D } ^ { \prime } } = \mathbb { E } _ { x \sim \mathcal { D } ^ { \prime } } \bigl [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \bigr ] , } \end{array} +$$ + +as the first $\binom { k } { 2 }$ columns and has $\mathbb { E } _ { x \sim \mathcal { D } ^ { \prime } } [ x \otimes x ]$ as the last column. + +Theorem 10. Given weight matrix $W$ with $\| w _ { i } \| \le \tau$ for each row vector and symmetric input distribution $\mathcal { D }$ . Suppose that $k \leq d / 7$ and $\sigma _ { \operatorname* { m i n } } ( W ) \geq \rho ,$ , after applying $( Q , \lambda )$ -perturbations to yield perturbed input distribution $\mathcal { D } ^ { \prime }$ , where $Q$ is a $d \times d$ matrix whose entries are i.i.d. Gaussians, we have with probability at least $1 - \exp ( - d ^ { \Omega ( 1 ) } )$ over the randomness of $Q$ , + +$$ +\sigma _ { \operatorname* { m i n } } ( M ^ { \mathcal { D } ^ { \prime } } ) \geq p o l y ( 1 / \tau , 1 / d , \rho , \lambda ) . +$$ + +We will prove this later in Section C.3. + +# C.1 SMOOTHED ANALYSIS FOR GAUSSIAN INPUTS + +In this section, we will prove Theorem 9, as restated below: + +Theorem 9. Suppose that $k \leq d / 5$ , and the input follows standard Gaussian distribution $\mathcal { N } ( 0 , I _ { d } )$ . Given any weight matrix $W$ with $\| w _ { i } \| \le \tau$ for each row vector, let $\widetilde { W }$ be a perturbed version of $W$ according to Equation (18) and $\widetilde { M }$ be the perturbed augmented distinguishing matrix. With probability at least $\bar { 1 - \exp ( - d ^ { \Omega ( 1 ) } ) }$ , we have + +$$ +\sigma _ { \operatorname* { m i n } } ( \widetilde { M } ) \geq p o l y ( 1 / \tau , 1 / d , \rho ) . +$$ + +To prove this theorem, recall the definition of $M _ { i j }$ : + +$$ +\begin{array} { r } { \mathrm { m a t } ( M _ { i j } ) = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x x ^ { \top } ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] . } \end{array} +$$ + +Since Gaussian distribution is highly symmetric, for every direction $u$ that is orthogonal to both $w _ { i }$ and $w _ { j }$ , we have $u ^ { \top } \operatorname* { m a t } ( M _ { i j } ) u$ be a constant. We can compute this constant as + +$$ +m _ { i j } : = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] . +$$ + +This implies that if we consider $\mathrm { m a t } ( M _ { i j } ) - m _ { i j } I _ { d }$ , it is going to be a matrix whose rows and columns are in span of $w _ { i }$ and $w _ { j }$ . In fact we can compute the matrix explicitly as the following lemma: + +Lemma 19. Suppose input $x$ follows standard Gaussian distribution $\mathcal { N } ( 0 , I _ { d } )$ , and suppose weight matrix $W$ has full-row rank, then for any $1 \leq i < j \leq k$ , we have + +$$ +\begin{array} { l } { { m a t } ( M _ { i j } ) = \displaystyle \frac { 1 } { \pi } \big ( \phi _ { i j } \cos ( \phi _ { i j } ) - \sin ( \phi _ { i j } ) \big ) \| w _ { i } \| \| w _ { j } \| I _ { d } + \displaystyle \frac { \phi _ { i j } } { \pi } \big ( w _ { i } w _ { j } ^ { \top } + w _ { j } w _ { i } ^ { \top } \big ) } \\ { \displaystyle ~ - \frac { \sin \left( \phi _ { i j } \right) } { \pi } ( \frac { \| w _ { i } \| } { \| w _ { j } \| } w _ { j } w _ { j } ^ { \top } + \frac { \| w _ { j } \| } { \| w _ { i } \| } w _ { i } w _ { i } ^ { \top } ) , } \end{array} +$$ + +where $0 < \phi _ { i j } < \pi$ is the angle between weight vectors $w _ { i }$ and $w _ { j }$ + +Of course, the same lemma would be applicable to $\widetilde { W }$ , so we have an explicit formula for $\widetilde { M } _ { i j }$ . We will bound the smallest singular value using the idea of leave-one-out distance (as previously used in Rudelson & Vershynin (2009)). + +Leave-one-out Distance Leave-one-out distance is a metric that is closely related to the smallest singular value but often much easier to estimate. + +Definition 2. For a matrix $A \in \mathbb { R } ^ { d \times n } ( d \geq n )$ , the leave-one-out distance $d ( A )$ is defined to be the smallest distance between a column of $A$ to the span of other columns. More precisely, let $A _ { i }$ be the $i$ -th column of $A$ and $S _ { - i }$ be the span of all the columns except for $A _ { i }$ , then + +$$ +d ( A ) : = \operatorname* { m i n } _ { i \in [ n ] } \| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \| . +$$ + +Rudelson & Vershynin (2009) showed that one can lowerbound the smallest singular value of a matrix by its leave-one-out distance. + +Lemma 20 (Rudelson & Vershynin (2009)). For matrix $A \ \in \ \mathbb { R } ^ { d \times n } ( d \ \geq \ n )$ , we always have $\begin{array} { r } { d ( A ) \geq \sigma _ { \operatorname* { m i n } } ( A ) \geq \frac { 1 } { \sqrt { n } } d ( A ) } \end{array}$ . + +Therefore, to bound $\sigma _ { \mathrm { m i n } } ( \widetilde { M } )$ we just need to lowerbound $d ( \widetilde { M } )$ . We use the ideas similar to Bhaskara et al. (2014) and Ma et al. (2016). Since every column of $\widetilde { M }$ (except for $\widetilde { M } _ { 0 } ^ { \mathrm { ~ ~ } }$ ) is random, we will try to show that even if we condition on all the other columns, because of the randomness in $\widetilde { M } _ { i j }$ , the distance between $\widetilde { M } _ { i j }$ to the span of other columns is large. However, there are several obstacles in this approach: + +1. The augmented distinguishing matrix $\widetilde { M }$ has a special column ${ \widetilde { M } } _ { 0 } = \operatorname { v e c } ( I _ { d } )$ that does not have any randomness. +2. The closed form expression for $\widetilde { M }$ (as in Lemma 19) has complicated coefficients that are not linear in the vectors $\widetilde { w } _ { i }$ and $\widetilde { w } _ { j }$ . +3. The columns of $\widetilde { M } _ { i j }$ are not independent with each other, so if we condition on all the other columns, $\widetilde { M } _ { i j }$ is no longer random. + +To address the first obstacle, we will prove a stronger version of Lemma 20 that allows a special column. + +Lemma 21. Let $\textit { A } \in \mathbb { R } ^ { d \times ( n + 1 ) }$ $( d ~ \geq ~ n + 1 )$ be an arbitrary matrix whose columns are $A _ { 0 } , A _ { 1 } , . . . , A _ { n }$ . For any $i = 1 , 2 , . . . , n ,$ , let $S _ { - i }$ be the subspace spanned by all the other columns (including $A _ { 0 }$ ) except for $A _ { i }$ , and let $\begin{array} { r } { d ^ { \prime } ( A ) : = \operatorname* { m i n } _ { i = 1 , \ldots , n } \left| \left| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \right| \right| } \end{array}$ . Suppose the column $A _ { 0 }$ has norm $\sqrt { d }$ and $A _ { 1 } , . . . , A _ { n }$ has norm at most $C$ , then + +$$ +\sigma _ { \operatorname* { m i n } } ( A ) \geq \operatorname* { m i n } { \Bigl ( } { \sqrt { \frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \sqrt { \frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \prime } ( A ) { \Bigr ) } . +$$ + +This lemma shows that if we can bound the leave-one-out distance for all but one column, then the smallest singular value of the matrix is still lowerbounded as long as the columns do not have very different norms. We defer the proof to Section C.2. + +For the second obstacle, we show that these coefficients are lowerbounded with high probability. +Therefore we can condition on the event that all the coefficients are large enough. + +Lemma 22. Given weight vectors $w _ { i }$ and $w _ { j }$ with norm $\| w _ { i } \| , \| w _ { j } \| \leq \tau ,$ , let $\widetilde { w } _ { i } = w _ { i } + \rho \varepsilon _ { i } , \widetilde { w } _ { j } =$ $w _ { j } + \rho \varepsilon _ { j }$ where $\varepsilon _ { i } , \varepsilon _ { j }$ eare i.i.d. Gaussian random vectors. With probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , we know $\lVert \widetilde { w } _ { i } \rVert \leq \tau + \sqrt { 3 \rho ^ { 2 } d / 2 } , \lVert \widetilde { w } _ { j } \rVert \leq \tau + \sqrt { 3 \rho ^ { 2 } d / 2 }$ and + +$$ +\widetilde { \phi } _ { i j } \ge \frac { \sqrt { \rho ^ { 2 } ( d - 2 ) } } { \sqrt { 2 } \tau + \sqrt { 3 \rho ^ { 2 } d } } , +$$ + +where $\widetilde { \phi } _ { i j }$ is the angle between $\widetilde { w } _ { i }$ and $\widetilde { w } _ { j }$ . In particular, if $\widetilde { \cdot } \widetilde { W } = W + \rho E$ where $E$ is an i.i.d. Gaussian random matrix, with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , for all i, $\| \widetilde { w } _ { i } \| \le \tau + \sqrt { 3 \rho ^ { 2 } d / 2 }$ , and for all $i < j$ , the coefficient $\widetilde { \phi } _ { i j } / \pi$ in front of the term $\widetilde { w } _ { i } \widetilde { w } _ { j } ^ { \top } + \widetilde { w } _ { j } \widetilde { w } _ { i } ^ { \top }$ is at least $\frac { \sqrt { \rho ^ { 2 } ( d - 2 ) } } { ( \sqrt { 2 } \tau + \sqrt { 3 \rho ^ { 2 } d } ) \pi }$ . + +This lemma intuitively says that after the perturbation $\widetilde { w } _ { i }$ and $\widetilde { w } _ { j }$ cannot be close to co-linear. We defer the detailed proof to Section C.2. + +For the final obstacle, we use ideas very similar to Ma et al. (2016) which decouples the randomness of the columns. + +Proof of Theorem 9. Let $E _ { 1 }$ be the event that Lemma 22 does not hold. Event $E _ { 1 }$ will be one of the bad events (but note that we do not condition on $E _ { 1 }$ not happening, we use a union bound at the end). + +We partition $[ d ]$ into two disjoint subsets $L _ { 1 } , L _ { 2 }$ of size $d / 2$ . Let ${ \widetilde { M } } ^ { \prime }$ be the set of rows of $\widetilde { M }$ indexed by $L _ { 1 } \times L _ { 2 }$ . That is, the columns of ${ \widetilde { M } } ^ { \prime }$ are + +$$ +\widetilde { \mathcal { M } } _ { i j } ^ { \prime } = \frac { \widetilde { \phi } _ { i j } } { \pi } \big ( \widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } } + \widetilde { w } _ { j , L _ { 1 } } \otimes \widetilde { w } _ { i , L _ { 2 } } \big ) - \frac { \sin \big ( \widetilde { \phi } _ { i j } \big ) } { \pi } \big ( \frac { \| \widetilde { w } _ { i } \| } { \| \widetilde { w } _ { j } \| } \widetilde { w } _ { j , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } } + \frac { \| \widetilde { w } _ { j } \| } { \| \widetilde { w } _ { i } \| } \widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { i , L _ { 2 } } \big ) , +$$ + +for $i < j$ , where $\widetilde { w } _ { i , L }$ denotes the restriction of vector $\widetilde { w } _ { i }$ to the subset $L$ . Note that the restriction of ${ \mathrm { v e c } } ( I _ { d } )$ e to the rows indexed by $L _ { 1 } \times L _ { 2 }$ eis just an all zero vector. + +We will focus on a column $\widetilde { M } _ { i j } ^ { \prime }$ with $i < j$ and try to prove it has a large distance to the span of all the other columns. Let $V _ { i j }$ be the span of all other columns, which is equal to $V _ { i j } = \mathrm { s p a n } \{ \widetilde { M } _ { k l } ^ { \prime } :$ $k < l \wedge ( k , l ) \neq ( i , j ) \}$ (note that we do not need to consider $\widetilde { M } _ { 0 }$ because that column is 0 when restricted to $L _ { 1 } \times L _ { 2 }$ . + +It’s clear that $V _ { i j }$ is correlated with $\widetilde { M } _ { i j } ^ { \prime }$ , which is bad for the proof. To get around this problem, we f follow the idea of Ma et al. (2016) and define the following subspace that contains $V _ { i j }$ , + +$$ +\begin{array} { r } { \hat { V } _ { i j } = \mathrm { s p a n } \Big \{ \widetilde { w } _ { k , L _ { 1 } } \otimes x , x \otimes \widetilde { w } _ { k , L _ { 2 } } , \widetilde { w } _ { j , L _ { 1 } } \otimes x , x \otimes \widetilde { w } _ { i , L _ { 2 } } \Big | k \notin \{ i , j \} , x \in \mathbb { R } ^ { d / 2 } \Big \} . } \end{array} +$$ + +By definition $V _ { i j } \subset \hat { V } _ { i j }$ , and thus ${ \hat { V } } _ { i j } ^ { \perp } \subset V _ { i j } ^ { \perp }$ , where $V _ { i j } ^ { \perp }$ denotes the orthogonal subspace of $V _ { i j }$ . Observe that $\widetilde { w } _ { j , L _ { 1 } } \otimes \widetilde { w } _ { i , L _ { 2 } } , \widetilde { w } _ { j , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } } , \widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { i , L _ { 2 } } \in \hat { V } _ { i j } ,$ thus + +$$ +\mathrm { P r o j } _ { \hat { V } _ { i j } ^ { \perp } } \widetilde { M } _ { i j } ^ { \prime } = \frac { \widetilde { \phi } _ { i j } } { \pi } \mathrm { P r o j } _ { \hat { V } _ { i j } ^ { \perp } } \left( \widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } } \right) . +$$ + +Note that $\begin{array} { r } { ( k - 2 ) d / 2 + ( k - 2 ) d / 2 + d / 2 + d / 2 = ( k - 1 ) d < \frac { 4 } { 5 } \cdot \frac { d ^ { 2 } } { 4 } } \end{array}$ $\widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } }$ is independent with $\hat { V } _ { i j }$ . Moreover, subspace . Then by Lemma 31, we know that with $\hat { V } _ { i j }$ has dimension at most $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ + +$$ +\begin{array} { r } { \mathrm { P r o j } _ { \hat { V } _ { i j } ^ { \perp } } \left( \widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } } \right) \geq \mathrm { p o l y } ( 1 / d , \rho ) . } \end{array} +$$ + +Let $E _ { 2 }$ be the event that this inequality does not hold for some $i , j$ . + +Let $S _ { i j } = \mathrm { s p a n } \{ \widetilde { M } _ { 0 } , \widetilde { M } _ { k l } : k < l \land ( k , l ) \neq ( i , j ) \} .$ . Now we know when neither bad events $E _ { 1 }$ or $E _ { 2 }$ happens, for every pair $i < j$ , + +$$ +\begin{array} { r l } & { \mathrm { P r o j } _ { S _ { i j } ^ { \perp } } \widetilde { M } _ { i j } \ge \mathrm { P r o j } _ { V _ { i j } ^ { \perp } } \widetilde { M } _ { i j } ^ { \prime } } \\ & { \qquad \ge \mathrm { P r o j } _ { \hat { V } _ { i j } ^ { \perp } } \widetilde { M } _ { i j } ^ { \prime } } \\ & { \qquad = \frac { \widetilde { \phi } _ { i j } } { \pi } \mathrm { P r o j } _ { \hat { V } _ { i j } ^ { \perp } } \left( \widetilde { w } _ { i , L _ { 1 } } \otimes \widetilde { w } _ { j , L _ { 2 } } \right) } \\ & { \qquad \ge \mathrm { p o l y } ( 1 / \tau , 1 / d , \rho ) . } \end{array} +$$ + +Currently, we have proved that for any $i < j$ , the distance between column $\widetilde { M } _ { i j }$ and the span of other columns is at least inverse polynomial. To use Lemma 21 we just need to give a bound on the norms of these columns. By Lemma 22, we know when $E _ { 1 }$ does not happen + +$$ +\forall i , \| \widetilde { w } _ { i } \| \leq \tau + \sqrt { \frac { 3 \rho ^ { 2 } d } { 2 } } , +$$ + +where $\tau$ is the uniform upper bound of the norm of every row vector of $W$ . Let $\begin{array} { r } { \widetilde { \tau } = \tau + \sqrt { \frac { 3 \rho ^ { 2 } d } { 2 } } } \end{array}$ , we know $\widetilde { \tau } = \mathrm { p o l y } ( \tau , d , \rho )$ . + +Thus, we have + +$$ +\begin{array} { l } { \displaystyle | \widetilde { M } _ { i j } | | \le \frac { 1 } { \pi } \bigl ( \widetilde { \phi } _ { i j } | \cos ( \widetilde { \phi } _ { i j } ) | + \sin ( \widetilde { \phi } _ { i j } ) \bigr ) | | \widetilde { w } _ { i } | | | \widetilde { w } _ { j } | | \sqrt { d } } \\ { \displaystyle \qquad + \frac { \widetilde { \phi } _ { i j } } { \pi } ( \| \widetilde { w } _ { i } \| \| \widetilde { w } _ { j } \| + \| \widetilde { w } _ { j } \| \| \widetilde { w } _ { i } \| ) } \\ { \displaystyle \qquad + \frac { \sin ( \widetilde { \phi } _ { i j } ) } { \pi } ( \| \widetilde { w } _ { i } \| \| \widetilde { w } _ { j } \| + \| \widetilde { w } _ { j } \| \| \widetilde { w } _ { i } \| ) } \\ { \displaystyle \qquad \le \frac { \widetilde { \tau } ^ { 2 } } { \pi } ( \pi + 1 ) \sqrt { d } + 2 \widetilde { \tau } ^ { 2 } + \frac { 2 \widetilde { \tau } ^ { 2 } } { \pi } . } \end{array} +$$ + +Thus, there exists $C = \mathrm { p o l y } ( \tau , d , \rho )$ , such that $\| \widetilde { M } _ { i j } \| \le C$ for every $i < j$ . Now applying Lem$\mathrm { \ m a } 2 1$ immediately gives the result. + +# C.2 PROOF OF AUXILIARY LEMMAS FOR SECTION C.1 + +We will first prove the characterization for columns in the augmented distinguishing matrix. + +Proof of Lemma 19. For simplicity, we start by assuming that every weight vector $w _ { i }$ has unit norm. At the end of the proof we will discuss how to incorporate the norms of $w _ { i } , w _ { j }$ . Also throughout the proof we will abuse notation to use $M _ { i j }$ as its matrix form $\mathrm { m a t } ( M _ { i j } )$ . + +$\boldsymbol { S } _ { i j }$ e subspace spanned by be a set of orthonorma $w _ { i }$ and sis f $w _ { j }$ Let su $\mathcal { S } _ { i j } ^ { \perp }$ behat onaland $\boldsymbol { S } _ { i j }$ . Let. We 1 2use matrix $\{ e _ { 1 } ^ { ( i , j ) } , e _ { 2 } ^ { ( i , j ) } \}$ $S _ { i j } \in \mathbb { R } ^ { d \times 2 }$ to represent subspace $\boldsymbol { S } _ { i j }$ $\boldsymbol { S } _ { i j }$ 1 , which matrix has $e _ { 1 } ^ { ( i , j ) } = w _ { i }$ $e _ { 1 } ^ { ( i , j ) }$ and $e _ { 2 } ^ { ( i , j ) }$ $\langle e _ { 2 } ^ { ( i , j ) } , w _ { j } \rangle > 0$ as two columns. Also, let $S _ { i j } ^ { \perp }$ be a $d \times ( d - 2 )$ matrix, whose columns constitute an orthonormal basis of $\begin{array} { r } { S _ { i j } ^ { \perp } } \end{array}$ . + +Let $\mathrm { P r o j } _ { S _ { i j } } = S _ { i j } S _ { i j } ^ { \top }$ , and $\mathrm { P r o j } _ { { S } _ { i j } ^ { \perp } } = I _ { d } - S _ { i j } S _ { i j } ^ { \top }$ . Then, we have + +$$ +\begin{array} { r l } & { M _ { i j } = \mathbf { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } + \mathbf { P r o j } _ { S _ { i j } } M _ { i j } } \\ & { \qquad = ( \mathbf { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } + m _ { i j } \mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } \mathbf { P r o j } _ { S _ { i j } } I _ { d } ) } \\ & { \qquad = ( \mathbf { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } + m _ { i j } \mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \top } ) } \end{array} +$$ + +First, we show that + +$$ +\mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } + m _ { i j } \mathrm { P r o j } _ { S _ { i j } } I _ { d } = m _ { i j } I _ { d } , +$$ + +which is equivalent to proving that $\mathrm { P r o j } _ { { S _ { i j } ^ { \perp } } } M _ { i j } = m _ { i j } \mathrm { P r o j } _ { { S _ { i j } ^ { \perp } } } I _ { d }$ . It’s obvious that the column span of $\mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j }$ belongs to the subspace $S _ { i j } ^ { \perp }$ . Actually, the row span of $\mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j }$ also belongs to the subspace $\begin{array} { r } { S _ { i j } ^ { \perp } } \end{array}$ . To show this, let’s consider $u ^ { \top } ( \mathrm { P r o j } _ { S _ { i j } ^ { \bot } } M _ { i j } ) v$ , where $u \in S _ { i j } ^ { \perp }$ and $v \in S _ { i j }$ . + +$$ +\begin{array} { r l } & { u ^ { \top } ( \mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } ) v = u ^ { \top } ( I _ { d } - S _ { i j } S _ { i j } ^ { \top } ) M _ { i j } v } \\ & { \quad \quad \quad \quad \quad \quad = ( u ^ { \top } - u ^ { \top } S _ { i j } S _ { i j } ^ { \top } ) M _ { i j } v } \\ & { \quad \quad \quad \quad = u ^ { \top } M _ { i j } v , } \end{array} +$$ + +where the last equality holds since $u \in S _ { i j } ^ { \perp }$ is orthogonal to $e _ { 1 } ^ { ( i , j ) }$ and $e _ { 2 } ^ { ( i , j ) }$ . We also know that + +$$ +\begin{array} { r l } & { u ^ { \top } M _ { i j } v = u ^ { \top } \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x x ^ { \top } ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] v } \\ & { \qquad = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( u ^ { \top } x ) ( v ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] } \\ & { \qquad = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( v ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] \mathbb { E } [ ( u ^ { \top } x ) ] } \\ & { \qquad = 0 , } \end{array} +$$ + +where the third equality holds because $u ^ { \top } x$ is independent with $w _ { i } ^ { \top } x , w _ { j } ^ { \top } x$ and $v ^ { \top }$ . Note since $u$ is orthogonal with $w _ { i } , w _ { j } , v$ , we know for standard Gaussian vector $x$ , random variable $u ^ { \top } x$ is independent with $w _ { i } ^ { \top } x , w _ { j } ^ { \top } x , v ^ { \top } x$ . + +Since the column span and row span of $\mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j }$ both belong to the subspace $S _ { i j } ^ { \perp }$ , there must exist a $( d - 2 ) \times ( d - 2 )$ matrix $C$ , such that $\mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } = S _ { i j } ^ { \perp } C ( S _ { i j } ^ { \perp } ) ^ { \top }$ . We only need to show this matrix $C$ must be $m _ { i j } I _ { d - 2 }$ . In order to show this, we prove for any $u , v \in S _ { i j } ^ { \perp }$ , $u ^ { \top } ( \mathrm { P r o j } _ { S _ { i j } ^ { \bot } } M _ { i j } ) v =$ $m _ { i j } u ^ { \top } v$ . + +$$ +\begin{array} { r l } { u ^ { \top } \big ( \mathrm { P r o j } _ { S _ { i j } ^ { \bot } } M _ { i j } \big ) v = u ^ { \top } M _ { i j } v } & { } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \end{array} +$$ + +where the fourth equality holds because $u ^ { \top } x , v ^ { \top } x$ are independent with $w _ { i } ^ { \top } x , w _ { j } ^ { \top } x$ . Thus, we know + +$$ +\begin{array} { r l } & { M _ { i j } = ( \mathrm { P r o j } _ { S _ { i j } ^ { \perp } } M _ { i j } + m _ { i j } \mathrm { P r o j } _ { S _ { i j } } I _ { d } ) + ( \mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \top } ) } \\ & { \qquad = m _ { i j } I _ { d } + ( \mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \top } ) . } \end{array} +$$ + +Let’s now compute the closed form for $m _ { i j }$ . Recall that + +$$ +m _ { i j } : = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] . +$$ + +Note, we only need to consider input $x$ within subspace $\boldsymbol { S } _ { i j }$ , which subspace has dimension two. Using the polar representation of two-dimensional Gaussian random variables ( $r$ is the radius and $\theta$ is the angle), we have + +$$ +m _ { i j } = \frac { 1 } { 2 \pi } \int _ { 0 } ^ { \infty } r ^ { 3 } \exp ( - \frac { r ^ { 2 } } { 2 } ) d r \int _ { \frac { \pi } { 2 } - \phi _ { i j } } ^ { \frac { \pi } { 2 } } 2 \cos ( \theta ) \cos ( \theta + \phi _ { i j } ) d \theta = \frac { 1 } { \pi } \big ( \phi _ { i j } \cos ( \phi _ { i j } ) - \sin ( \phi _ { i j } ) \big ) . +$$ + +Next, we compute the closed form of $\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ . Note $\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ is symmetric, because $\mathrm { P r o j } _ { S _ { i j } } M _ { i j } = M _ { i j } - m _ { i j } I _ { d } + m _ { i j } S _ { i j } S _ { i j } ^ { \top }$ , and $M _ { i j } , I _ { d }$ and $S _ { i j } S _ { i j } ^ { \top }$ are all symmetric. It’s obvious that the column span of $\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ belongs to subspace $\boldsymbol { S } _ { i j }$ . Combined with the fact that $\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ is symmetric, we know the row span of $\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ also belongs to the subspace $\boldsymbol { S } _ { i j }$ . Thus, matrix $\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ can be represented as a linear combination of $( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top }$ , + +P $\mathrm { r o j } _ { S _ { i j } } M _ { i j } = c _ { 1 1 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top } + c _ { 2 2 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } )$ > , +where coeffic $c _ { 1 1 } ^ { ( i , j ) } , c _ { 1 2 } ^ { ( i , j ) } , c _ { 2 1 } ^ { ( i , j ) }$ and r com $c _ { 2 2 } ^ { ( i , j ) }$ are four coefficients. Now, we onion. Similar as the computation for eed to figure out the four, we use polar integration $m _ { i j }$ +to show that, + +$$ +\begin{array} { l } { { { \displaystyle c _ { 1 1 } ^ { ( i , j ) } = \langle P r o j _ { S _ { i j } } M _ { i j } , ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { T } \rangle } } } \\ { { { \displaystyle ~ = \frac { 1 } { 2 \pi } \int _ { 0 } ^ { \infty } r ^ { 5 } \exp ( - \frac { r ^ { 2 } } { 2 } ) d r \int _ { \frac { \pi } { 2 } - \phi _ { i j } } ^ { \frac { \pi } { 2 } } \big ( \cos ^ { 3 } ( \theta ) \cos ( \theta + \phi _ { i j } ) + \cos ( \theta ) \cos ^ { 3 } ( \theta + \phi _ { i j } ) \big ) d \theta } } } \\ { { { \displaystyle ~ = \frac { 1 } { 4 \pi } ( 1 2 \phi _ { i j } \cos ( \phi _ { i j } ) - 9 \sin ( \phi _ { i j } ) - \sin ( 3 \phi _ { i j } ) ) , } } } \end{array} +$$ + +where the first equality holds because $e _ { 1 } ^ { ( i , j ) }$ is orthogonal with $e _ { 2 } ^ { ( i , j ) }$ . Similarly, we can show that + +$$ +\begin{array} { l } { { \tiny \begin{array} { l } { { ( i , j ) = \displaystyle \langle P r o j _ { S _ { i j } } M _ { i j } , ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { T } \rangle } } \\ { { \tiny = \displaystyle \frac { 1 } { 2 \pi } \int _ { 0 } ^ { \infty } r ^ { 5 } \exp ( - \frac { r ^ { 2 } } { 2 } ) d r \int _ { \frac { r } { 2 } - \phi _ { i j } } ^ { \frac { r } { 2 } } \big ( \cos ( \theta ) \cos ( \theta + \phi _ { i j } ) \sin ^ { 2 } ( \theta ) + \cos ( \theta ) \cos ( \theta + \phi _ { i j } ) \sin ^ { 2 } ( \theta + \phi _ { i j } ) \big ) \cos ( \theta ) \big \ d ( \theta + \phi _ { i j } \big ) } } \\ { { \tiny = \displaystyle \frac { 1 } { 4 \pi } \big ( 4 \phi _ { i j } \cos ( \phi _ { i j } ) - 7 \sin ( \phi _ { i j } ) + \sin ( 3 \phi _ { i j } ) \big ) , } } \end{array} } } \end{array} +$$ + +and + +$$ +\begin{array} { c l } { { \frac { ( i , j ) } { 2 1 } = \langle { \cal P r o j } _ { S _ { i j } } M _ { i j } , ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { T } \rangle } } \\ { { } } & { { { } } } \\ { { } } & { { = \displaystyle \frac { 1 } { 2 \pi } \int _ { 0 } ^ { \infty } r ^ { 5 } \exp ( - \frac { r ^ { 2 } } { 2 } ) d r \int _ { \frac { r } { 2 } - \phi _ { i j } } ^ { \frac { r } { 2 } } \big ( - \cos ^ { 2 } ( \theta ) \cos ( \theta + \phi _ { i j } ) \sin ( \theta ) + \cos ( \theta ) \cos ^ { 2 } ( \theta + \phi _ { i j } ) \sin ( \theta ) \big ) \big ) \big \langle ( e _ { 2 } ^ { ( i , j ) } ) e _ { 1 } ^ { \frac { r } { 2 } } \big \rangle } } \\ { { } } & { { { } } } \\ { { } } & { { = \displaystyle \frac { 1 } { \pi } \big ( \phi _ { i j } \sin ( \phi _ { i j } ) - \cos ( \phi _ { i j } ) \sin ^ { 2 } ( \phi _ { i j } ) \big ) . } } \end{array} +$$ + +It’s easy to check that c(i,j12 $c _ { 1 2 } ^ { ( i , j ) } = c _ { 2 1 } ^ { ( i , j ) }$ . Let $M _ { i j } ^ { \prime }$ be $\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j }$ . Then, according to above computation, we know + +$$ +\begin{array} { r l } & { { \mathcal { U } _ { i j } ^ { \prime } = \mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } } } \\ & { \quad = ( c _ { 1 1 } ^ { ( i , j ) } - m _ { i j } ) ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top } + ( c _ { 2 2 } ^ { ( i , j ) } - m _ { i j } ) ( } \\ & { \quad = \frac { 1 } { 4 \pi } \big ( 8 \phi _ { i j } \cos ( \phi _ { i j } ) - 5 \sin ( \phi _ { i j } ) - \sin ( 3 \phi _ { i j } ) \big ) ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top } } \\ & { \quad \quad \quad + \frac { 1 } { 4 \pi } \big ( - 3 \sin ( \phi _ { i j } ) + \sin ( 3 \phi _ { i j } ) \big ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \top } } \\ & { \quad \quad \quad + \frac { 1 } { \pi } \big ( \phi _ { i j } \sin ( \phi _ { i j } ) - \cos ( \phi _ { i j } ) \sin ^ { 2 } ( \phi _ { i j } ) \big ) \big ( ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \top } + ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \top } \big ) . } \end{array} +$$ + +Since $e _ { 1 } ^ { ( i , j ) } = w _ { i }$ and $\begin{array} { r } { e _ { 2 } ^ { ( i , j ) } = \frac { 1 } { \sin ( \phi _ { i j } ) } w _ { j } - \cot ( \phi _ { i j } ) w _ { i } } \end{array}$ , we can also express $M _ { i j } ^ { \prime }$ as a linear combination of $w _ { i } w _ { i } ^ { \top } , w _ { j } w _ { j } ^ { \top } , w _ { i } w _ { j } ^ { \top }$ and $w _ { j } w _ { i } ^ { \top }$ . + +$$ +\begin{array} { l } { { \displaystyle { \cal U } _ { i j } ^ { \prime } = \frac { 1 } { 4 \pi } \big ( 8 \phi _ { i j } \cos ( \phi _ { i j } ) - 5 \sin ( \phi _ { i j } ) - \sin ( 3 \phi _ { i j } ) \big ) w _ { i } w _ { i } ^ { \top } } } \\ { { \displaystyle ~ + \frac { 1 } { 4 \pi } \big ( - 3 \sin ( \phi _ { i j } ) + \sin ( 3 \phi _ { i j } ) \big ) \big ( \frac { w _ { j } } { \sin ( \phi _ { i j } ) } - \cot ( \phi _ { i j } ) w _ { i } \big ) \big ( \frac { w _ { j } } { \sin ( \phi _ { i j } ) } - \cot ( \phi _ { i j } ) w _ { i } \big ) ^ { \top } } } \\ { { \displaystyle ~ + \frac { 1 } { \pi } \big ( \phi _ { i j } \sin ( \phi _ { i j } ) - \cos ( \phi _ { i j } ) \sin ^ { 2 } ( \phi _ { i j } ) \big ) \big ( w _ { i } \big ( \frac { w _ { j } } { \sin ( \phi _ { i j } ) } - \cot ( \phi _ { i j } ) w _ { i } \big ) ^ { \top } + \big ( \frac { w _ { j } } { \sin ( \phi _ { i j } ) } - \cot ( \phi _ { i j } ) w _ { i } \big ) \big ) ^ { \top } ~ , } } \\ { { \displaystyle ~ = \frac { \phi _ { i j } } { \pi } \big ( w _ { i } w _ { j } ^ { \top } + w _ { j } w _ { i } ^ { \top } \big ) - \frac { \sin \big ( \phi _ { i j } \big ) } { \pi } \big ( w _ { j } w _ { j } ^ { \top } + w _ { i } w _ { i } ^ { \top } \big ) . } } \end{array} +$$ + +Thus, + +$$ +\begin{array} { l } { { { \displaystyle M _ { i j } = m _ { i j } I _ { d } + M _ { i j } ^ { \prime } } } } \\ { { { \displaystyle \quad = \frac { 1 } { \pi } ( \phi _ { i j } \cos ( \phi _ { i j } ) - \sin ( \phi _ { i j } ) ) I _ { d } + \frac { \phi _ { i j } } { \pi } ( w _ { i } w _ { j } ^ { \top } + w _ { j } w _ { i } ^ { \top } ) - \frac { \sin ( \phi _ { i j } ) } { \pi } ( w _ { j } w _ { j } ^ { \top } + w _ { i } w _ { i } ^ { \top } ) } . } } \end{array} +$$ + +Finally, if the rows $w _ { i } , w _ { j }$ do not have unit norm, let $\bar { w } _ { i } = w _ { i } / \| w _ { i } \| , \bar { w } _ { j } = w _ { j } / \| w _ { j } \|$ , we know + +$$ +\begin{array} { r l } & { m _ { i j } = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] } \\ & { \quad \quad = \| w _ { i } \| \| w _ { j } \| \mathbb { E } \big [ ( \bar { w } _ { i } ^ { \top } x ) ( \bar { w } _ { j } ^ { \top } x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] } \\ & { \quad = \cfrac { 1 } { \pi } ( \phi _ { i j } \cos ( \phi _ { i j } ) - \sin ( \phi _ { i j } ) ) \| w _ { i } \| \| w _ { j } \| . } \end{array} +$$ + +Here we used the fact that the indicator variable does not change whether we use $w _ { i } , w _ { j }$ or $\bar { w } _ { i } , \bar { w } _ { j }$ Similarly, + +$$ +\begin{array} { r l } & { = \mathbb { E } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) x x ^ { \top } \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] } \\ & { = \| w _ { i } \| \| w _ { j } \| \mathbb { E } \big [ ( \bar { w } _ { i } ^ { \top } x ) ( \bar { w } _ { j } ^ { \top } x ) x x ^ { \top } \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] } \\ & { = \frac { 1 } { \pi } ( \phi _ { i j } \cos ( \phi _ { i j } ) - \sin ( \phi _ { i j } ) ) \| w _ { i } \| \| w _ { j } \| I _ { d } + \frac { \phi _ { i j } } { \pi } ( w _ { i } w _ { j } ^ { \top } + w _ { j } w _ { i } ^ { \top } ) - \frac { \sin ( \phi _ { i j } ) } { \pi } ( \frac { \| w _ { i } \| } { \| w _ { j } \| } \frac { w _ { j } w ^ { \top } } { \| w _ { j } \| } + \frac { \| w _ { j } \| ^ { 2 } } { \| w _ { i } \| ^ { 2 } } ) } \end{array} +$$ + +Now we can prove the lemmas used to handle the two obstacles. First we give the stronger leaveone-out distance bound. + +Proof of Lemma 21. The smallest singular value of $A$ can be defined as follows: + +$$ +\sigma _ { \operatorname* { m i n } } ( A ) : = \operatorname* { m i n } _ { u : \| u \| = 1 } \| A u \| . +$$ + +Suppose $u ^ { * } \in \mathrm { a r g m i n } _ { u : \| u \| = 1 } \| A u \|$ . Let $\boldsymbol { u } _ { i } ^ { * }$ be the coordinate corresponding to the column $A _ { i }$ , for $0 \leq i \leq n$ . We consider two cases here. If $\begin{array} { r } { | u _ { 0 } ^ { * } | \geq \sqrt { \frac { 4 n C ^ { 2 } } { 4 n C ^ { 2 } + d } } } \end{array}$ , then we have + +$$ +\begin{array} { r l } { \sigma _ { \operatorname* { m i n } } ( A ) = \left| A u ^ { c } \right| } & { = } \\ & { = \left\| A u _ { s } ^ { * } A _ { 0 } + \sum _ { i \leq i \leq n } u _ { i } ^ { * } A _ { i } \right\| } \\ & { \geq \left\| u _ { s } ^ { * } A _ { 0 } \right\| - \left\| \displaystyle \sum _ { 1 \leq i \leq n } u _ { i } ^ { * } A _ { i } \right\| } \\ & { \geq \sqrt { \displaystyle \frac { 4 n c ^ { 2 } } { 4 n c ^ { 2 } + d } } \sqrt { d } - ( \sum _ { 1 \leq i \leq n } | u _ { i } ^ { * } | ) C } \\ & { \geq \sqrt { \displaystyle \frac { 4 n c ^ { 2 } d } { 4 n C ^ { 2 } + d } } - \sqrt { n } \sqrt { \displaystyle \frac { d } { 4 n C ^ { 2 } + d } } C } \\ & { = \sqrt { \displaystyle \frac { n c ^ { 2 } d } { 4 n C ^ { 2 } + d } } , } \end{array} +$$ + +where the third inequality uses Cauchy-Schwarz inequality. + +If $\begin{array} { r } { | u _ { 0 } ^ { * } | < \sqrt { \frac { 4 n C ^ { 2 } } { 4 n C ^ { 2 } + d } } } \end{array}$ , we know $\begin{array} { r } { \sum _ { 1 \leq i \leq n } | u _ { i } ^ { * } | ^ { 2 } \geq \frac { d } { 4 n C ^ { 2 } + d } } \end{array}$ . Let $k \in \mathrm { a r g m a x } _ { 1 \leq i \leq n } | u _ { i } ^ { * } |$ . We know that $\begin{array} { r } { | u _ { k } ^ { * } | \geq \sqrt { \frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } \end{array}$ . Thus, + +$$ +\begin{array} { r l r } { { \sigma _ { \operatorname* { m i n } } ( A ) \geq \| u _ { k } ^ { * } A _ { k } + \sum _ { i : i \neq k } u _ { i } ^ { * } A _ { i } \| } } \\ & { } & { \quad = | u _ { k } ^ { * } | \| A _ { k } + \sum _ { i : i \neq k } \frac { u _ { i } ^ { * } } { u _ { k } ^ { * } } A _ { i } \| } \\ & { } & { \quad \geq | u _ { k } ^ { * } | \| ( I _ { d } - \operatorname* { P r o j } _ { S _ { - k } } ) A _ { k } \| } \\ & { } & { \quad \geq | u _ { k } ^ { * } | d ^ { \prime } ( A ) } \\ & { } & { \quad \geq \sqrt { \frac { d } { 4 m ^ { 2 } C ^ { 2 } + n d } } d ^ { \prime } ( A ) . } \end{array} +$$ + +Above all, we know that the smallest singular value of $A$ is lower bounded as follows, + +$$ +\sigma _ { \operatorname* { m i n } } ( A ) \geq \operatorname* { m i n } { \Bigl ( } { \sqrt { \frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \sqrt { \frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \prime } ( A ) { \Bigr ) } . +$$ + +Next we give the bound on the angle between two perturbed vectors $\widetilde { w } _ { i }$ and $\widetilde { w } _ { j }$ . + +Proof of Lemma 22. According to the definition of $\rho$ -perturbation, we know $\widetilde { w } _ { i } = w _ { i } + \rho \varepsilon _ { i } , \widetilde { w } _ { j } =$ $w _ { j } + \rho \varepsilon _ { j }$ , where $\varepsilon _ { i } , \varepsilon _ { j }$ e eare i.i.d. standard Gaussian vectors. First, we show that with high probability, the projection of $\widetilde { w } _ { i }$ on the orthogonal subspace of $\widetilde { w } _ { j }$ is lower bounded. Denote the subspace spanned by $\widetilde { w } _ { j }$ as $s _ { \tilde { w } _ { j } }$ , and denote the subspace spanned by $\{ \widetilde { w } _ { j } , w _ { i } \}$ as $s _ { \tilde { w } _ { j } \cup w _ { i } }$ . Thus, we have + +$$ +\begin{array} { r l } & { \left\| \mathrm { P r o j } _ { { \cal S } _ { \widetilde { w } _ { j } } ^ { \perp } } \widetilde { w } _ { i } \right\| \geq \left\| \mathrm { P r o j } _ { { \cal S } _ { \widetilde { w } _ { j } \cup w _ { i } } ^ { \perp } } ( w _ { i } + \rho \varepsilon _ { i } ) \right\| } \\ & { \qquad = \rho \left\| \mathrm { P r o j } _ { { \cal S } _ { \widetilde { w } _ { j } \cup w _ { i } } ^ { \perp } } \varepsilon _ { i } \right\| } \end{array} +$$ + +where S ⊥wj i s the orthogonal subspace of $S _ { \widetilde { w } _ { j } }$ + +Fix εj , then S ⊥wj ∪wi is a fixed subspace of $\mathbb { R } ^ { d }$ with dimension $d - 2$ . Let $U$ be a $d \times ( d - 2 )$ e matrix, whose columns constitute a set of orthonormal basis for the subspace $S _ { \widetilde { w } _ { j } \cup w _ { i } } ^ { \bot }$ . Thus, it’s not hard to check that $\operatorname { P r o j } _ { \mathcal { S } _ { \widetilde { w } _ { j } \cup w _ { i } } ^ { \perp } } \varepsilon _ { i } \overset { d } { = } U \varepsilon$ , where $\varepsilon \in \mathbb { R } ^ { d - 2 }$ eis a standard Gaussian vector. Denote $Y : = \| \mathrm { P r o j } _ { { S _ { \tilde { w } _ { j } \cup w _ { i } } ^ { \perp } } } \varepsilon _ { i } \| ^ { 2 } \overset { d } { = } \| U \varepsilon \| ^ { 2 } = \| \varepsilon \| ^ { 2 }$ , which is a chi-squared random variable with $( d - 2 )$ degrees of freedom. According to the tail bound for chi-squared random variable, we have + +$$ +\operatorname* { P r } [ | \frac { 1 } { d - 2 } Y - 1 | \geq t ] \leq 2 e ^ { \frac { - ( d - 2 ) t ^ { 2 } } { 8 } } , \forall t \in ( 0 , 1 ) . +$$ + +Let $\begin{array} { r } { t = \frac { 1 } { 2 } } \end{array}$ , we know that with probability at least $\begin{array} { r } { 1 - 2 \exp ( \frac { - ( d - 2 ) } { 3 2 } ) } \end{array}$ + +$$ +Y \geq { \frac { d - 2 } { 2 } } . +$$ + +Thus, we have kProjS⊥wj weik ≥ ρkProjS⊥wj∪wi ε ρ2(d−2) . Recall that + +$$ +\begin{array} { r } { \| \mathrm { P r o j } _ { { S _ { \tilde { w } _ { j } } ^ { \perp } } } \widetilde { w } _ { i } \| = \sin ( \widetilde { \phi } _ { i j } ) \| \widetilde { w } _ { i } \| . } \end{array} +$$ + +We also know + +$$ +\begin{array} { r l } & { \| \widetilde { \boldsymbol { w } } _ { i } \| = \| \boldsymbol { w } _ { i } + \rho \varepsilon _ { i } \| } \\ & { \qquad \leq \| \boldsymbol { w } _ { i } \| + \rho \| \varepsilon _ { i } \| } \\ & { \qquad = \tau + \rho \| \varepsilon _ { i } \| , } \end{array} +$$ + +where the last equality holds since $\| w _ { i } \| \le \tau$ . Note $\| \varepsilon _ { i } \| ^ { 2 }$ is another chi-squared random variable with $d$ degrees of freedom. Similar as above, we can show that with probability at least $\textstyle 1 - 2 \exp ( { \frac { - d } { 3 2 } } )$ , + +$$ +\| \varepsilon _ { i } \| ^ { 2 } \leq { \frac { 3 d } { 2 } } . +$$ + +By union bound, we know with probability at least $\begin{array} { r } { 1 - 2 \exp ( \frac { - d } { 3 2 } ) - 2 \exp ( \frac { - ( d - 2 ) } { 3 2 } ) , } \end{array}$ + +$$ +\begin{array} { r } { \sin ( \widetilde { \phi } _ { i j } ) \| \widetilde { w } _ { i } \| \geq \sqrt { \frac { \rho ^ { 2 } ( d - 2 ) } { 2 } } , } \\ { \| \widetilde { w } _ { i } \| \leq \tau + \sqrt { \frac { 3 \rho ^ { 2 } d } { 2 } } . } \end{array} +$$ + +Combined with the fact that $\widetilde { \phi } _ { i j } \geq \sin ( \widetilde { \phi } _ { i j } )$ when $\widetilde { \phi } _ { i j } \in [ 0 , \pi ]$ , we know with probability at least $\begin{array} { r } { 1 - 2 \exp ( \frac { - d } { 3 2 } ) - 2 \exp ( \frac { - ( d - 2 ) } { 3 2 } ) } \end{array}$ + +$$ +\begin{array} { r l } & { \tilde { \phi } _ { i j } \geq \sin ( \tilde { \phi } _ { i j } ) } \\ & { \quad = \frac { \sin ( \tilde { \phi } _ { i j } ) \| \widetilde { w } _ { i } \| } { \| \widetilde { w } _ { i } \| } } \\ & { \quad \geq \frac { \sqrt { \frac { \rho ^ { 2 } ( d - 2 ) } { 2 } } } { \tau + \sqrt { \frac { 3 \rho ^ { 2 } d } { 2 } } } } \\ & { \quad = \frac { \sqrt { \rho ^ { 2 } ( d - 2 ) } } { \sqrt { 2 } \tau + \sqrt { 3 \rho ^ { 2 } } \zeta } } \end{array} +$$ + +Given $\widetilde { W } = W + \rho E$ , where $E$ is an i.i.d. Gaussian matrix, by union bound, we know with probability at least $\therefore - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\begin{array} { c } { \displaystyle \forall i , \| \widetilde { w } _ { i } \| \leq \tau + \sqrt { 3 \rho ^ { 2 } d / 2 } } \\ { \displaystyle \forall i < j , \frac { \widetilde { \phi } _ { i j } } { \pi } \geq \frac { \sqrt { \rho ^ { 2 } ( d - 2 ) } } { ( \sqrt { 2 } \tau + \sqrt { 3 \rho ^ { 2 } d } ) \pi } } \end{array} +$$ + +In this section, we show that starting from any well-conditioned weight matrix $W$ , and any symmetric input distribution $\mathcal { D }$ , how to perturb the distribution locally to $\mathcal { D } ^ { \prime }$ so that the smallest singular value of $M ^ { \mathcal { D ^ { \prime } } }$ is at least inverse polynomial. + +Recall the definition of $( Q , \lambda )$ -perturbation: we mix the original distribution $\mathcal { D }$ with a distribution $\mathcal { D } _ { Q }$ which is just a Gaussian $\hat { \mathcal { N } } ( 0 , Q Q ^ { \top } )$ . To create a sample $x$ in $\mathcal { D } ^ { \prime }$ , with probability $1 - \lambda$ we draw a sample from $\mathcal { D }$ ; otherwise we draw a standard Gaussian $n \sim \mathcal N ( 0 , I _ { d } ) ^ { \cdot }$ and let $x = Q n$ . We will prove Theorem 10 which we restate below: + +Theorem 10. Given weight matrix $W$ with $\| w _ { i } \| \le \tau$ for each row vector and symmetric input distribution $\mathcal { D }$ . Suppose that $k \leq d / 7$ and $\sigma _ { \operatorname* { m i n } } ( W ) \geq \rho ,$ , after applying $( Q , \lambda )$ -perturbations to yield perturbed input distribution $\mathcal { D } ^ { \prime }$ , where $Q$ is a $d \times d$ matrix whose entries are i.i.d. Gaussians, we have with probability at least $1 - \exp \bigl ( - d ^ { \dot { \Omega } ( 1 ) } \bigr )$ over the randomness of $Q$ , + +$$ +\sigma _ { \operatorname* { m i n } } ( M ^ { \mathcal { D } ^ { \prime } } ) \geq p o l y ( 1 / \tau , 1 / d , \rho , \lambda ) . +$$ + +To prove this, let us first take a look at the structure of augmented distinguishing matrix for these distributions. Let $M ^ { D } , M ^ { D _ { Q } } , M ^ { D ^ { \prime } }$ be the augmented distinguishing matrices for distributions $\mathcal { D }$ , $\mathcal { D } _ { Q }$ and $\mathcal { D } ^ { \prime }$ respectively. Since $\mathcal { D } ^ { \prime }$ is a mixture of $\mathcal { D }$ and $\mathcal { D } _ { Q }$ , and the augmented distinguishing matrix is defined as expectations over samples, we immediately have + +$$ +\boldsymbol { M } ^ { D ^ { \prime } } = ( 1 - \lambda ) \boldsymbol { M } ^ { D } + \lambda \boldsymbol { M } ^ { D _ { Q } } . +$$ + +Our proof will go in two steps. First we will show that $\sigma _ { \mathrm { m i n } } ( M ^ { D _ { Q } } )$ is large. Then we will show that even mixing with $M ^ { \mathcal { D } }$ will not significantly reduce the smallest singular value, so $\sigma _ { \mathrm { m i n } } ( M ^ { D ^ { \prime } } )$ is also large. In addition to the techniques that we developed in Section C.1, we need two ideas that we call noise domination and subspace decoupling to solve the new challenges here. + +Noise Domination First let us focus on $\sigma _ { \mathrm { m i n } } ( M ^ { D _ { Q } } )$ . This instance has weight $W$ and input distribution $\mathcal { N } ( 0 , Q Q ^ { \top } )$ . Let $M ^ { W Q }$ be the augmented distinguishing matrix for an instance with weight $W Q$ and input distribution $\mathcal { N } ( 0 , I _ { d } )$ . Our first observation shows that $M ^ { \mathcal { D } _ { Q } }$ and $M ^ { W Q }$ are closely related, and we only need to analyze the smallest singular value of $M ^ { W Q }$ . The problem now is very similar to what we did in Theorem 9, except that the weight $W Q$ is not an i.i.d. Gaussian matrix. However, we will still be able to use Theorem 9 as a black-box because the amount of noise in $W Q$ is in some sense dominating the noise in a standard Gaussian. More precisely, we use the following simple claim: + +Claim 1. Suppose property $\mathcal { P }$ holds for $\textstyle { \mathcal { N } } ( \mu , I _ { d } )$ for any $\mu$ , and the property $\mathcal { P }$ is convex (in the sense that $i f \mathcal { P }$ holds for two distributions it also holds for their mixture), then for any covariance matrix $\Sigma \succeq I _ { d }$ , we know $\mathcal { P }$ also holds for $\mathcal { N } ( \boldsymbol { \mu } , \boldsymbol { \Sigma } )$ . + +Intuitively the claim says that if the property holds for a Gaussian distribution with smaller variance regardless of the mean, then it will also hold for a Gaussian distribution with larger variance. The proof is quite simple: + +Proof. Let $\Sigma ^ { \prime } = \Sigma - I _ { d }$ , by assumption we know $\Sigma ^ { \prime }$ is still a positive semidefinite matrix. Let $x \sim { \mathcal { N } } ( { \boldsymbol { \mu } } , { \boldsymbol { \Sigma } } )$ , $x ^ { \prime } \sim \mathcal { N } ( \mu , \Sigma ^ { \prime } )$ and $\delta \sim \mathcal { N } ( 0 , I _ { d } )$ , by property of Gaussians it is easy to see that $x \overset { d } { = } x ^ { \prime } + \delta$ . Let $d _ { x } , d _ { x ^ { \prime } }$ and $d _ { \delta }$ be the density function for $x , x ^ { \prime } , \delta$ respectively, then we know for any point $u$ + +$$ +d _ { x } ( u ) = \mathbb { E } _ { x ^ { \prime } \sim \mathcal { N } ( \mu , \Sigma ^ { \prime } ) } [ d _ { \delta } ( u - x ^ { \prime } ) ] . +$$ + +That is, $\mathcal { N } ( \boldsymbol { \mu } , \boldsymbol { \Sigma } )$ is a mixture of $\mathcal { N } ( x ^ { \prime } , I )$ . Since property $\mathcal { P }$ is true for all $\mathcal { N } ( x ^ { \prime } , I )$ , it is also true for $\mathcal { N } ( \boldsymbol { \mu } , \boldsymbol { \Sigma } )$ . □ + +With this claim we can immediately use the result of Theorem 9 to show $\sigma _ { \mathrm { m i n } } ( M ^ { D _ { Q } } )$ is large. + +Subspace Decoupling Next we need to consider the mixture $M ^ { \mathcal { D ^ { \prime } } }$ . The worry here is that although $\sigma _ { \mathrm { m i n } } ( M ^ { D _ { Q } } )$ is large, mixing with $\mathcal { D }$ might introduce some cancellations and make $\sigma _ { \mathrm { m i n } } ( M ^ { D ^ { \prime } } )$ much smaller. To prove that this cannot happen with high probability, the key observation is that in the first step, to prove $\sigma _ { \operatorname* { m i n } } ( M ^ { W Q } )$ is large we have only used the property of $W Q$ . If we let $\bar { Q }$ be the projection of $Q$ to the orthogonal space of row span of $W$ , then $\bar { Q }$ is still a Gaussian random matrix even if we condition on the value of $W Q$ ! Therefore in the second step we will use the additional randomness in $\bar { Q }$ to show that the cancellation cannot happen. The idea of partitioning the randomness of Gaussian matrices has been widely used in analysis of approximate message passing algorithms. The actual proof is more involved and we will need to partition the Gaussian matrix $Q$ into more parts in order to handle the special column in the augmented distinguishing matrix . + +Now we are ready to give the full proof of Theorem 10 + +Proof of Theorem 10. Let us first recall the definition of augmented distinguishing matrix: $M ^ { \mathcal { D ^ { \prime } } }$ is a $d ^ { 2 }$ by $( k _ { 2 } + 1 )$ matrix, where the first $k _ { 2 }$ columns consist of + +$$ +\begin{array} { r } { M _ { i j } ^ { \mathcal { D } ^ { \prime } } : = \mathbb { E } _ { x \sim \mathcal { D } ^ { \prime } } \big [ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \big ] , } \end{array} +$$ + +and the last column is $\mathbb { E } _ { x \sim \mathcal { D } ^ { \prime } } [ x \otimes x ]$ . According to the definition of $( Q , \lambda )$ -perturbation, if we let $\mathcal { D } _ { Q }$ be $\mathcal { N } ( 0 , Q Q ^ { \top } )$ , then we have + +$$ +M ^ { D ^ { \prime } } = ( 1 - \lambda ) M ^ { D } + \lambda M ^ { D _ { Q } } . +$$ + +In the first step, we will try to analyze $M ^ { \mathcal { D } _ { Q } }$ . The first $k _ { 2 }$ columns of this matrix $M ^ { \mathcal { D } _ { Q } }$ can be written as: + +$$ +\begin{array} { r l } & { M _ { i j } ^ { { D _ { Q } } } = \mathbb { E } _ { x \sim \mathcal { D } _ { Q } } \left[ ( w _ { i } ^ { \top } x ) ( w _ { j } ^ { \top } x ) ( x \otimes x ) \mathbb { 1 } \{ w _ { i } ^ { \top } x w _ { j } ^ { \top } x \leq 0 \} \right] } \\ & { \quad \quad \quad = \mathbb { E } _ { n \sim \mathcal { N } ( 0 , { I _ { d } } ) } \left[ ( w _ { i } ^ { \top } Q n ) ( w _ { j } ^ { \top } Q n ) ( Q n \otimes Q n ) \mathbb { 1 } \{ w _ { i } ^ { \top } Q n w _ { j } ^ { \top } Q n \leq 0 \} \right] } \\ & { \quad \quad \quad = Q \otimes Q \mathbb { E } _ { n \sim \mathcal { N } ( 0 , { I _ { d } } ) } \left[ ( w _ { i } ^ { \top } Q n ) ( w _ { j } ^ { \top } Q n ) ( n \otimes n ) \mathbb { 1 } \{ w _ { i } ^ { \top } Q n w _ { j } ^ { \top } Q n \leq 0 \} \right] } \end{array} +$$ + +for any $i < j$ , and the last column is + +$$ +\begin{array} { r l } & { \mathbb { E } _ { \boldsymbol { x } \sim \mathcal { D } _ { Q } } [ \boldsymbol { x } \otimes \boldsymbol { x } ] = \mathbb { E } _ { \boldsymbol { n } \sim \mathcal { N } ( \boldsymbol { 0 } , I _ { d } ) } [ Q \boldsymbol { n } \otimes Q \boldsymbol { n } ] } \\ & { \qquad = Q \otimes Q \mathbb { E } _ { \boldsymbol { n } \sim \mathcal { N } ( \boldsymbol { 0 } , I _ { d } ) } [ \boldsymbol { n } \otimes \boldsymbol { n } ] . } \end{array} +$$ + +Except for the factor $Q \otimes Q$ , the remainder of these columns are exactly the same as the augmented distinguishing matrix of a network whose first layer weight matrix is $W Q$ and input distribution is $\mathcal { N } ( 0 , \bar { I } _ { d } )$ . We use $M ^ { W Q }$ to denote the augmented distinguishing matrix of such a network, then we have + +$$ +M ^ { D _ { Q } } = Q \otimes Q M ^ { W Q } . +$$ + +Therefore we can first analyze the smallest singular value of $M ^ { W Q }$ . Let $\widetilde { W } = W Q$ . Note that $Q$ is a Gaussian matrix, and $W$ is fixed, so $W Q$ is also a Gaussian random matrix except its entries are not i.i.d. More precisely, there are only correlations within columns of $W Q$ , and for any column of $W Q$ , the covariance matrix is $W W ^ { \top }$ . Since the smallest singular value of $W$ is at least $\rho$ , we know $\sigma _ { \operatorname* { m i n } } ( W W ^ { \top } ) \geq \rho ^ { 2 }$ . Let the covariance matrix of $W Q$ be $\sum _ { W Q } \mathbf { \Psi } \in \mathbb { R } ^ { k d \times k d }$ , which has smallest singular value at least $\rho ^ { 2 }$ . Therefore we know $\Sigma _ { W Q } \ \succeq \ \rho ^ { 2 } I _ { k d }$ . It’s not hard to verify that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , the norm of every row of $W Q$ is upper bounded by poly $( \tau , d )$ . By Claim 1, any convex property that holds for any $\mathcal { N } ( 0 , \rho ^ { 2 } I _ { k d } )$ perturbation must also hold for $\Sigma _ { W Q } { } ^ { 4 }$ . Thus, we know with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\sigma _ { \operatorname* { m i n } } ( M ^ { W Q } ) \geq \mathrm { p o l y } ( 1 / \tau , 1 / d , \rho ) . +$$ + +To prepare for the next step, we will rewrite $M ^ { W Q }$ as the product of two matrices. According to the closed form of $M _ { i j } ^ { W Q }$ in Lemma 19, we know each column of $M ^ { W Q }$ can be expressed as a linear combination of $\widetilde { w } _ { i } \otimes \widetilde { w } _ { j }$ ’s and ${ \mathrm { v e c } } ( I _ { d } )$ . Therefore: + +$$ +M ^ { W Q } = \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] R , +$$ + +where matrix $R$ has dimension $( k ^ { 2 } + 1 ) \times ( k _ { 2 } + 1 )$ . It’s not hard to verify that + +$$ +\begin{array} { r } { \sigma _ { \operatorname* { m i n } } ( M ^ { W Q } ) \leq \Big \| \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] \Big \| \sigma _ { \operatorname* { m i n } } ( R ) . } \end{array} +$$ + +Thus, + +$$ +\sigma _ { \operatorname* { m i n } } ( R ) \geq \frac { \sigma _ { \operatorname* { m i n } } ( M ^ { W Q } ) } { \left\| \left[ \widetilde W ^ { \top } \otimes \widetilde W ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] \right\| } . +$$ + +Note that $W$ is a $k \times d$ matrix with $\| w _ { i } \| \le \tau$ for every row vector, and $\widetilde { W } = W Q$ , where $Q$ is an standard Gaussian matrix. Thus, similar as the proof in Lemma 22, we can show that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\begin{array} { r } { \left\| \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] \right\| \leq \left\| \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] \right\| _ { F } \leq \mathrm { p o l y } ( \tau , d ) . } \end{array} +$$ + +Thus, we know + +$$ +\sigma _ { \operatorname* { m i n } } ( R ) \geq \operatorname { p o l y } ( 1 / \tau , 1 / d , \rho ) . +$$ + +Now we will try to perform the second step using the idea of subspace decoupling. Let $\mathrm { P r o j } _ { W }$ be the projection matrix to the row span of $W$ , and let ${ \mathrm { P r o j } } _ { W ^ { \perp } } = I _ { d } - { \mathrm { P r o j } } _ { W }$ . Let $\bar { Q } \doteq \mathsf { P r o j } _ { W ^ { \perp } } \bar { Q }$ . Let the columns of $U \in \mathbb { R } ^ { d \times ( d - k ) }$ be a set of orthonormal basis for the orthogonal subspace $W ^ { \perp }$ . By symmetry of Gaussian, $\mathrm { P r o j } _ { W } Q$ is independent with ${ \mathrm { P r o j } } _ { W ^ { \perp } } Q$ . Thus, from now on we will condition on ${ \mathrm { P r o j } } _ { W } Q$ , and still treat $\mathrm { P r o j } _ { W ^ { \perp } } Q$ as a Gaussian random matrix. More precisely, $\mathrm { P r o j } _ { W ^ { \perp } } Q$ has the same distribution as $U P$ , where $P \in \mathbb { R } ^ { ( d - k ) \times d }$ is a standard Gaussian matrix. + +We further decouple the $P$ part into two subspaces (this is done mostly to handle the special column in augmented distinguishing matrix). Let the rows of $V \in \mathbb { R } ^ { k \times d }$ be a set of orthonormal basis for the row span of $\widetilde { W } = W Q$ . And let the rows of $V ^ { \perp } \in \mathbb { R } ^ { ( d - k ) \times d }$ be a a set of orthonormal basis for the orthogonal subspace $\widetilde { W } ^ { \perp }$ . We can then decompose $U P$ into the row span of $V$ and $V ^ { \perp }$ as follows, + +$$ +U P \overset { d } { = } U P _ { 1 } V ^ { \perp } + U P _ { 2 } V , +$$ + +where $P _ { 1 } \in \mathbb { R } ^ { ( d - k ) \times ( d - k ) }$ and $P _ { 2 } \in \mathbb { R } ^ { ( d - k ) \times k }$ are two independent standard Gaussian matrices. After this decomposition, we have + +$$ +\begin{array} { r l } & { \quad \bar { Q } \otimes \bar { Q } \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] R } \\ & { \overset { d } { = } U P \otimes U P \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] R } \\ & { \overset { d } { = } ( U P _ { 1 } V ^ { \bot } + U P _ { 2 } V ) \otimes ( U P _ { 1 } V ^ { \bot } + U P _ { 2 } V ) \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] R } \\ & { = U \otimes U ( P _ { 1 } V ^ { \bot } + P _ { 2 } V ) \otimes ( P _ { 1 } V ^ { \bot } + P _ { 2 } V ) \left[ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathrm { v e c } ( I _ { d } ) \right] R } \\ & { = U \otimes U \left[ ( P _ { 1 } V ^ { \bot } + P _ { 2 } V ) \widetilde { W } ^ { \top } \otimes ( P _ { 1 } V ^ { \bot } + P _ { 2 } V ) \widetilde { W } ^ { \top } , \mathrm { v e c } ( ( P _ { 1 } V ^ { \bot } + P _ { 2 } V ) ( P _ { 1 } V ^ { \bot } + P _ { 2 } V ) ^ { \top } ) \right] R } \\ & { = U \otimes U \left[ P _ { 2 } V \widetilde { W } ^ { \top } \otimes P _ { 2 } V \widetilde { W } ^ { \top } , \mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \top } + P _ { 2 } P _ { 2 } ^ { \top } ) \right] R , } \end{array} +$$ + +where the last equality holds because the row span of $V ^ { \perp }$ is orthogonal to the column span of $\widetilde { W } ^ { \top }$ + +Now, we go back to matrix $M ^ { \mathcal { D ^ { \prime } } }$ . Let $\operatorname { P r o j } _ { W ^ { \perp } \otimes W ^ { \perp } }$ be $\operatorname { P r o j } _ { W ^ { \perp } } \otimes \operatorname { P r o j } _ { W ^ { \perp } }$ . We have, + +$$ +\begin{array} { r l } { \mathsf { r } _ { \operatorname* { m i n } } \bigl ( M ^ { \mathcal { D } ^ { \prime } } \bigr ) = \sigma _ { \operatorname* { m i n } } \bigl ( ( 1 - \lambda ) M ^ { \mathcal { D } } + \lambda M ^ { \mathcal { D } _ { Q } } \bigr ) } & { } \\ { = \sigma _ { \operatorname* { m i n } } \Bigl ( ( 1 - \lambda ) M ^ { \mathcal { D } } + \lambda Q \otimes Q \Bigl [ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathsf { v e c } ( I _ { d } ) \Bigr ] R \Bigr ) } & { } \\ { \ge \sigma _ { \operatorname* { m i n } } \Bigl ( ( 1 - \lambda ) \mathsf { P r o j } _ { W ^ { \bot } \otimes W ^ { \bot } } M ^ { \mathcal { D } } + \lambda \mathbf { P r o j } _ { W ^ { \bot } \otimes W ^ { \bot } } Q \otimes Q \Bigl [ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathsf { v e c } ( I _ { d } ) \Bigr ] R \Bigr ) } & { } \\ { = \sigma _ { \operatorname* { m i n } } \Bigl ( ( 1 - \lambda ) \mathsf { P r o j } _ { W ^ { \bot } \otimes W ^ { \bot } } M ^ { \mathcal { D } } + \lambda \widetilde { Q } \otimes \widetilde { Q } \Bigl [ \widetilde { W } ^ { \top } \otimes \widetilde { W } ^ { \top } , \mathsf { v e c } ( I _ { d } ) \Bigr ] R \Bigr ) } & { } \\ { = \sigma _ { \operatorname* { m i n } } \Bigl ( ( 1 - \lambda ) \mathsf { P r o j } _ { W ^ { \bot } \otimes W ^ { \bot } } M ^ { \mathcal { D } } + \lambda U \otimes U \Bigl [ P _ { 2 } V \widetilde { W } ^ { \top } \otimes P _ { 2 } V \widetilde { W } ^ { \top } , \mathsf { v e c } ( P _ { 1 } P _ { 1 } ^ { \top } + P _ { 2 } P _ { 2 } ^ { \top } ) \Bigr ] R \Bigr ) } & { } \end{array} +$$ + +Since $R$ has full row rank, we know that the row span of $\mathrm { P r o j } _ { W ^ { \perp } \otimes W ^ { \perp } } M ^ { \mathcal { D } }$ belongs to the row span of $R$ . According to the definition of $U$ , it’s also clear that the column span of $\mathrm { P r o j } _ { W ^ { \perp } \otimes W ^ { \perp } } M ^ { \mathcal { D } }$ belongs to the column span of $U \otimes U$ . Thus, there exists matrix $C \in R ^ { ( d - k ) ^ { 2 } \times ( k ^ { 2 } + 1 ) }$ such that + +$$ +\mathrm { P r o j } _ { W ^ { \perp } \otimes W ^ { \perp } } M ^ { \mathcal { D } } = U \otimes U C R . +$$ + +Thus, + +$$ +\begin{array} { r l } & { \mathsf { r } _ { \mathrm { m i n } } \big ( M ^ { \mathcal { D } ^ { \prime } } \big ) = \sigma _ { \mathrm { m i n } } \big ( \big ( 1 - \lambda \big ) M ^ { \mathcal { D } } + \lambda M ^ { \mathcal { D } _ { Q } } \big ) } \\ & { \qquad \ge \sigma _ { \mathrm { m i n } } \bigg ( \big ( 1 - \lambda \big ) \mathsf { P r o j } _ { W ^ { \perp } \otimes W ^ { \perp } } M ^ { \mathcal { D } } + \lambda U \otimes U \Big [ P _ { 2 } V \widetilde { W } ^ { \top } \otimes P _ { 2 } V \widetilde { W } ^ { \top } , \mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \top } + P _ { 2 } P _ { 2 } ^ { \top } ) \Big ] } \\ & { \qquad = \sigma _ { \mathrm { m i n } } \bigg ( \lambda U \otimes U \Big ( \frac { 1 - \lambda } { \lambda } C + \big [ P _ { 2 } V \widetilde { W } ^ { \top } \otimes P _ { 2 } V \widetilde { W } ^ { \top } , \mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \top } + P _ { 2 } P _ { 2 } ^ { \top } ) \big ] \Big ) R \bigg ) . } \end{array} +$$ + +Note that $C$ only depends on $U$ and $R , U$ only depends on $W$ , and $R$ only depends on $W Q$ . With $W Q$ fixed, $C$ is also fixed. Clearly, $C$ is independent with $P _ { 1 }$ and $P _ { 2 }$ . For convenience, denote + +$$ +H : = \frac { 1 - \lambda } { \lambda } C + \left[ P _ { 2 } V \widetilde { W } ^ { \top } \otimes P _ { 2 } V \widetilde { W } ^ { \top } , \mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \top } + P _ { 2 } P _ { 2 } ^ { \top } ) \right] . +$$ + +Now, let’s prove that the smallest singular value of matrix $H \in \mathbb { R } ^ { ( d - k ) ^ { 2 } \times ( k ^ { 2 } + 1 ) }$ is lower bounded using leave-one-out distance. Let’s first consider its submatrix $\hat { H }$ which consists of the first $k ^ { 2 }$ columns of $H$ . Note that within random matrix $P _ { 2 } V \widetilde { W } ^ { \top }$ , every row are independent with each other. Within each row, the covariance matrix is $\widetilde { W W } ^ { \top }$ . Recall that $\widetilde { W }$ is a random matrix whose covariance $\Sigma _ { W Q } \succeq \rho ^ { 2 } I _ { k d }$ , we can again apply Claim 1 with the property proved in Lemma 37. As a result, with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\sigma _ { \operatorname* { m i n } } ( \widetilde { W } ) \geq \mathrm { p o l y } ( 1 / d , \rho ) . +$$ + +Thus the covariance matrix of each row of $P _ { 2 } V \widetilde { W } ^ { \top }$ has smallest singular value at least $\gamma : =$ $\operatorname { p o l y } ( 1 / d , \rho )$ . + +We can view $P _ { 2 } V \widetilde { W } ^ { \top }$ as the summation of two independent Gaussian matrix, one of which has covariance matrix $\gamma I _ { ( d - k ) k }$ . For this matrix, we will do something very similar to Theorem 9 in order to lowerbound its smallest singular value. + +Claim 2. For a random matrix $K \in \mathbb { R } ^ { ( d - k ) \times k }$ that is equal to $K ^ { o } + E$ where $E$ is a Gaussian random matrix whose entries have variance $\gamma$ . If $d \geq 7 k$ , for any subspace $S _ { C }$ that is independent of $K$ and has dimension at most $k ^ { 2 } + 1$ , the leave-one-out distance $d ( P r o j _ { S _ { C } ^ { \perp } } K \otimes K )$ is at least $p o l y ( \gamma , 1 / d )$ . + +The proof idea is similar as Theorem 9, and we try to apply Lemma 31 to $K \otimes K$ . In the proof we should think of $K : = P _ { 2 } V \widetilde { W } ^ { \top }$ , and denote $i$ -th column of $K$ as $K _ { i }$ . We also think of the space $S _ { C }$ as the column span of $C$ . + +As we did in Theorem 9, we partition $[ d - k ]$ into 2 disjoint subsets $L _ { 1 }$ and $L _ { 2 }$ of size $( d - k ) / 2$ . +Let ${ \hat { H } } ^ { \prime }$ be the set of rows of $\hat { H }$ indexed by $L _ { 1 } \times L _ { 2 }$ . + +We fix a column $\hat { H } _ { i j } ^ { \prime }$ , $i \neq j \in [ k ]$ . Let $S = \mathrm { s p a n } \{ \hat { H } _ { k l } ^ { \prime } : ( k , l ) \neq ( i , j ) \}$ . It’s clear that $S$ is correlated with $\hat { H } _ { i j } ^ { \prime }$ . Let $C ^ { \prime }$ be the set of rows of $C$ indexed by $L _ { 1 } \times L _ { 2 }$ . Let $S _ { C ^ { \prime } }$ be the column span of $C ^ { \prime }$ , which has dimension at most $k ^ { 2 } + 1$ . We define the following subspace that contains $S$ , + +$$ +\hat { S } = S _ { C ^ { \prime } } \cup \operatorname { s p a n } \{ K _ { j , L _ { 1 } } \otimes x , x \otimes K _ { i , L _ { 2 } } , K _ { l , L _ { 1 } } \otimes x , x \otimes K _ { l , L _ { 2 } } \Big | x \in \mathbb { R } ^ { ( d - k ) / 2 } , l \not \in \{ i , j \} \} +$$ + +Therefor by definition $S \subset { \hat { S } }$ , and thus $\hat { S } ^ { \perp } \subset S ^ { \perp }$ , where $S ^ { \perp }$ denotes the orthogonal subspace of $S$ . Notice that $\begin{array} { r } { \hat { H } _ { i j } ^ { \prime } = K _ { i , L _ { 1 } } \otimes K _ { j , L _ { 2 } } + \frac { \lambda } { 1 - \lambda } C _ { i j } ^ { \prime } } \end{array}$ is independent with $\hat { S }$ , assuming $C$ is fixed. Moreover, $\hat { S }$ has dimension at most + +$$ +( d - k ) / 2 + ( d - k ) / 2 + ( k - 2 ) ( d - k ) / 2 + ( k - 2 ) ( d - k ) / 2 + k ^ { 2 } + 1 \leq { \frac { 4 } { 5 } } { \frac { ( d - k ) ^ { 2 } } { 4 } } , +$$ + +if $k \leq d / 7$ . Then, according to Lemma 31, we know with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\left\| \mathrm { P r o j } _ { \hat { S } ^ { \perp } } \hat { H } _ { i j } ^ { \prime } \right\| \geq \mathrm { p o l y } ( 1 / d , \rho ) . +$$ + +For the column $\hat { H } _ { i i } ^ { \prime } , i \in [ k ]$ , we define subspace $\hat { S }$ slightly different, + +$$ +\hat { S } = S _ { C ^ { \prime } } \cup \operatorname { s p a n } \{ K _ { l , L _ { 1 } } \otimes x , x \otimes K _ { l , L _ { 2 } } \Big | x \in \mathbb { R } ^ { ( d - k ) / 2 } , l \neq i \} . +$$ + +Here the dimension of $\hat { S }$ is also smaller than $( d - k ) ^ { 2 } / 5$ , assuming that $k \leq d / 7$ . We can similarly show that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\left\| \mathrm { P r o j } _ { \hat { S } ^ { \perp } } \hat { H } _ { i i } ^ { \prime } \right\| \geq \mathrm { p o l y } ( 1 / d , \rho ) . +$$ + +Thus, by union bound, we know that the leave-one-out distance of matrix ${ \hat { H } } ^ { \prime }$ is lower bounded by $\mathrm { p o l y } ( 1 / d , \rho )$ . + +Now, let’s add the additional column $\mathsf { r e c } ( P _ { 1 } P _ { 1 } ^ { \top } + P _ { 2 } P _ { 2 } ^ { \top } )$ into consideration. For convenience we denote this column by $b$ . We will first prove that the vector $b$ has large norm when projected to the orthogonal subspace of columns in $\hat { H }$ , then we will combine this with the fact that $\sigma _ { \mathrm { m i n } } ( { \hat { H } } )$ is large to show that $\sigma _ { \mathrm { m i n } } ( H )$ is also large (this last step is very similar to Lemma 21). + +We know matrix $\hat { H }$ only depends on the randomness of $P _ { 2 }$ . Thus, with $P _ { 2 }$ fixed, all columns in $H$ are fixed except for $b$ . Now, we rely on the randomness in $P _ { 1 }$ to show that the distance between $b$ and the span of other columns in $H$ is lower bounded. In order to get ride of the correlation within column $b$ , we also need to consider a subset of its rows indexed by $L _ { 1 } \times L _ { 2 }$ , denoted by $b ^ { \prime }$ . Let the first column of $P _ { 1 }$ be $p \in \mathbb { R } ^ { d - k }$ , and the submatrix consisting of other columns be $\hat { P } _ { 1 }$ . Let $S _ { \hat { H } ^ { \prime } }$ be the column span of ${ \hat { H } } ^ { \prime }$ . Let + +$$ +\hat { S } _ { \hat { H } ^ { \prime } } = S _ { \hat { H } ^ { \prime } } \cup S _ { C ^ { \prime } } \cup \mathrm { s p a n } ( \mathrm { v e c } ( \hat { P } _ { 1 } \hat { P } _ { 1 } ^ { \top } ) ^ { \prime } , \mathrm { v e c } ( P _ { 2 } P _ { 2 } ^ { \top } ) ^ { \prime } ) , +$$ + +where $\mathsf { v e c } ( \hat { P } _ { 1 } \hat { P } _ { 1 } ^ { \top } ) ^ { \prime }$ is the restriction of ve $\mathsf { c } ( \hat { P } _ { 1 } \hat { P } _ { 1 } ^ { \top } )$ to the rows indexed by $L _ { 1 } \times L _ { 2 }$ . The dimension of $\hat { S } _ { \hat { H } ^ { \prime } }$ is at most $k ^ { 2 } + k ^ { 2 } + 1 + 2 \leq ( d - k ) ^ { 2 } / 1 2$ , assuming that $k \leq d / 7$ . Clearly, + +$$ +\begin{array} { r l } & { \mathrm { P r o j } _ { S _ { \hat { H } ^ { \prime } } ^ { \perp } } b ^ { \prime } \geq \mathrm { P r o j } _ { \hat { S } _ { \hat { H } ^ { \prime } } ^ { \perp } } b ^ { \prime } } \\ & { \qquad = \mathrm { P r o j } _ { \hat { S } _ { \hat { H } ^ { \prime } } ^ { \perp } } p _ { L _ { 1 } } \otimes p _ { L _ { 2 } } , } \end{array} +$$ + +where $p _ { L }$ is the restriction of $p$ to rows indexed by $L$ . Note that $p _ { L _ { 1 } }$ and $p _ { L _ { 2 } }$ are two independent standard Gaussian vectors. Thus, according to Lemma 31, we know with probability at least $1 -$ $\exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , the distance between $b ^ { \prime }$ and the column span of ${ \hat { H } } ^ { \prime }$ is at least poly $( 1 / d )$ . + +Claim 3. For any matrix $A \in \mathbb { R } ^ { \frac { ( d - k ) ^ { 2 } } { 4 } \times k ^ { 2 } }$ and a vector $v \in \mathbb { R } ^ { \frac { ( d - k ) ^ { 2 } } { 4 } }$ , if the leave-one-out distance $d ( A ) \geq \delta$ , $\| P r o j _ { A ^ { \bot } } b \| \ge \zeta$ , and $\| v \| \leq C _ { 1 }$ , let $B \in \mathbb { R } ^ { \frac { ( d - k ) ^ { 2 } } { 4 } \times ( k ^ { 2 } + 1 ) }$ ×(k2+1) be the matrix that is the concatenation of $A$ and $v$ , then the leave-one-out distance $d ( B ) \geq p o l y ( \zeta , \delta , 1 / C _ { 1 } )$ . + +The proof idea is similar as the proof in Lemma 21. In the proof, we should think of $A : = \hat { H } ^ { \prime } , v : = b ^ { \prime }$ and $B : = H ^ { \prime }$ , where $H ^ { \prime }$ is the subset of rows of $H$ indexed by $L _ { 1 } \times L _ { 2 }$ . We know that $d ( { \hat { H } } ^ { \prime } ) \geq$ $\delta = \mathrm { p o l y } ( 1 / d , \rho ) , \| \mathrm { P r o j } _ { A ^ { \perp } } b \| \ge \zeta = \mathrm { p o l y } ( 1 / d )$ . It’s not hard to show that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\| b ^ { \prime } \| \leq \mathrm { p o l y } ( d ) . +$$ + +Thus, there exists $C _ { 1 } = \mathrm { p o l y } ( d )$ , such that $\| b ^ { \prime } \| \leq C _ { 1 }$ . We already proved that the leave-one-out distance of $b ^ { \prime }$ in $H ^ { \prime }$ is lower bounded. We only need to show the leave-one-out distance for the first $k ^ { 2 }$ columns, which are $\hat { H } _ { i j } ^ { \prime } , i , j \in [ k ]$ . + +For any $i , j \in [ k ]$ , the leave-one-out distance for $\hat { H } _ { i j } ^ { \prime }$ within matrix $H ^ { \prime }$ can be expressed as follows + +$$ +\operatorname* { m i n } _ { c _ { k l } , c _ { b } } \| \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } \hat { H } _ { k l } ^ { \prime } + c _ { b } b ^ { \prime } \| +$$ + +Let $\{ c _ { k l } ^ { * } , c _ { b } ^ { * } \}$ be one set of the optimal solutions to $\begin{array} { r } { \operatorname* { m i n } _ { c _ { k l } , c _ { b } } \| \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } \hat { H } _ { k l } ^ { \prime } + c _ { b } b ^ { \prime } \| } \end{array}$ . If $c _ { b } ^ { * } = 0$ , we immediately have + +$$ +\begin{array} { l } { { \displaystyle { \| \hat { H } _ { i j } ^ { \prime } + \sum _ { \ell , l } \hat { c } _ { k l } ^ { * } \hat { H } _ { k l } ^ { \prime } + c _ { b } ^ { * } b ^ { \prime } \| } } } \\ { { \displaystyle { = \| \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } ^ { * } \hat { H } _ { k l } ^ { \prime } \| } } } \\ { { \displaystyle { \geq \operatorname* { m i n } _ { c _ { k l } } \| \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } \hat { H } _ { k l } ^ { \prime } \| } } } \\ { { \displaystyle { > \delta } , } } \end{array} +$$ + +where the last inequality holds because the leave-one-out distance of matrix ${ \hat { H } } ^ { \prime }$ is lower bounded by $\delta$ . + +If $c _ { b } ^ { * } \neq 0$ , we need to be more careful. In this case, we have, + +$$ +\begin{array} { r l } & { \quad \displaystyle { \| \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } ^ { * } \hat { H } _ { k l } ^ { \prime } + c _ { b } ^ { * } b ^ { \prime } \| } } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ & { \displaystyle \mathrm { = } | c _ { b } ^ { * } | \left\| \frac { 1 } { c _ { b } ^ { * } } \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } \frac { c _ { k l } ^ { * } } { c _ { b } ^ { * } } \hat { H } _ { k l } ^ { \prime } + b ^ { \prime } \right\| } \\ & { \quad \quad \quad \quad \quad \quad \quad \quad \geq | c _ { b } ^ { * } | \zeta , } \end{array} +$$ + +where the last inequality holds because the distance of $b ^ { \prime }$ to the column span of ${ \hat { H } } ^ { \prime }$ is lower bounded. +If $\begin{array} { r } { | c _ { b } ^ { * } | \geq \frac { \delta } { 2 C _ { 1 } } } \end{array}$ , we have $\begin{array} { r } { \| \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } ^ { * } \hat { H } _ { k l } ^ { \prime } + c _ { b } ^ { * } b ^ { \prime } \| \ge \frac { \delta \zeta } { 2 C _ { 1 } } . } \end{array}$ . + +$\begin{array} { r } { | c _ { b } ^ { * } | < \frac { \delta } { 2 C _ { 1 } } } \end{array}$ , we have + +$$ +\begin{array} { l } { { \displaystyle | | \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } ^ { * } \hat { H } _ { k l } ^ { \prime } + c _ { b } ^ { * } b ^ { \prime } | | } } \\ { { \displaystyle \geq | | \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } ^ { * } \hat { H } _ { k l } ^ { \prime } | | - | | c _ { b } ^ { * } b ^ { \prime } | | } } \\ { { \displaystyle \geq \operatorname* { m i n } _ { c _ { k l } } | | \hat { H } _ { i j } ^ { \prime } + \sum _ { ( k , l ) \neq ( i , j ) } c _ { k l } \hat { H } _ { k l } ^ { \prime } | | - | c _ { b } ^ { * } | | | b ^ { \prime } | | } } \\ { { \displaystyle \geq \delta - \frac { \delta } { 2 C _ { 1 } } C _ { 1 } } } \\ { { \displaystyle = \delta / 2 . } } \end{array} +$$ + +Thus, the leave-one-out distance of $H ^ { \prime }$ is lower bounded by $\mathrm { p o l y } ( \zeta , \delta , 1 / C _ { 1 } )$ . Recall that with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , we have $\delta = \mathrm { p o l y } ( 1 / d , \rho ) , \zeta = \mathrm { p o l y } ( 1 / d ) , C _ { 1 } = \mathrm { p o l y } ( d )$ . Thus, we have + +$$ +d ( H ^ { \prime } ) \geq \operatorname { p o l y } ( 1 / d , \rho ) . +$$ + +According to Lemma 20, we have + +$$ +\begin{array} { c c c } { \displaystyle { \sigma _ { \operatorname* { m i n } } ( H ^ { \prime } ) \geq \frac { 1 } { \sqrt { k ^ { 2 } + 1 } } d ( H ^ { \prime } ) } } \\ { \displaystyle { \geq \mathrm { p o l y } ( 1 / d , \rho ) . } } \end{array} +$$ + +Finally, we put everything together. Since $H ^ { \prime }$ is a full column rank matrix, we know that $\sigma _ { \mathrm { m i n } } ( H ) \geq$ $\sigma _ { \operatorname* { m i n } } ( H ^ { \prime } ) \geq \mathrm { p o l y } ( 1 / d , \rho )$ . By union bound, we know with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\begin{array} { l } { \sigma _ { \operatorname* { m i n } } ( H ) \geq \mathrm { p o l y } ( 1 / d , \rho ) } \\ { \sigma _ { \operatorname* { m i n } } ( R ) \geq \mathrm { p o l y } ( 1 / \tau , 1 / d , \rho ) . } \end{array} +$$ + +Since $U$ is an orthonormal matrix, we know $\sigma _ { \mathrm { m i n } } ( U \otimes U ) = 1$ . According to Eq. 19, we know with probability at least $1 - \exp \bigl ( - d ^ { \Omega ( 1 ) } \bigr )$ , + +$$ +\begin{array} { r l } & { \sigma _ { \operatorname* { m i n } } ( M ^ { \mathcal { D } ^ { \prime } } ) \geq \sigma _ { \operatorname* { m i n } } ( \lambda U \otimes U H R ) } \\ & { \qquad \geq \lambda \sigma _ { \operatorname* { m i n } } ( U \otimes U ) \sigma _ { \operatorname* { m i n } } ( H ) \sigma _ { \operatorname* { m i n } } ( R ) } \\ & { \qquad \geq \mathrm { p o l y } ( 1 / \tau , 1 / d , \rho , \lambda ) } \end{array} +$$ + +where the second inequality holds since all of $U \otimes U$ , $H$ and $R$ have full column rank. + +# D TOOLS + +In this section, we collect some known results on matrix perturbations and concentration bounds. Basically, we used matrix concentration bounds to do the robust analysis and used matrix perturbation bounds to do the smoothed analysis. We also proved several corollaries that are useful in our setting. + +# D.1 MATRIX CONCENTRATION BOUNDS + +Matrix concentration bounds tell us that with enough number of independent samples, the empirical mean of a random matrix can converge to the mean of this matrix. + +Lemma 23 (Matrix Bernstein; Theorem 1.6 in Tropp (2012)). Consider a finite sequence $\{ Z _ { k } \}$ of independent, random matrices with dimension $d \sb { 1 } \times d \sb { 2 }$ . Assume that each random matrix satisfies + +$$ +\sigma ^ { 2 } : = \operatorname* { m a x } \Big \{ \big \| \sum _ { k } \mathbb { E } [ Z _ { k } Z _ { k } ^ { * } ] \big \| , \big \| \sum _ { k } \mathbb { E } [ Z _ { k } ^ { * } Z _ { k } ] \big \| \Big \} . +$$ + +Then, for all $t \geq 0$ , + +$$ +\operatorname* { P r } \Big \{ \Big \| \sum _ { k } Z _ { k } \Big \| \geq t \Big \} \leq ( d _ { 1 } + d _ { 2 } ) \exp \Big ( \frac { - t ^ { 2 } / 2 } { \sigma ^ { 2 } + R t / 3 } \Big ) . +$$ + +As a corollary, we have: + +Lemma 24. Consider a finite sequence $\{ Z _ { 1 } , Z _ { 2 } \cdot \cdot \cdot Z _ { m } \}$ of independent, random matrices with dimension $d _ { 1 } \times d _ { 2 }$ . Assume that each random matrix satisfies + +$$ +\left\| Z _ { k } \right\| \le R , 1 \le k \le m . +$$ + +Then, for all $t \geq 0$ , + +$$ +\operatorname* { P r } \Big \{ \big \| \sum _ { k = 1 } ^ { m } ( Z _ { k } - \mathbb { E } [ Z _ { k } ] ) \big \| \ge t \Big \} \le ( d _ { 1 } + d _ { 2 } ) \exp \Big ( \frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \Big ) . +$$ + +Proof. For each $k$ , let $Z _ { k } ^ { \prime } = Z _ { k } - \mathbb { E } [ Z _ { k } ]$ be the new random matrices. It’s clear that $\mathbb { E } [ Z _ { k } ^ { \prime } ] = 0$ and $\| Z _ { k } ^ { \prime } \| \leq 2 R$ . For the variance, + +$$ +\begin{array} { r l } { \displaystyle \sigma ^ { 2 } \leq \sum _ { k = 1 } ^ { m } \| \mathbb { E } [ Z _ { k } ^ { \prime } Z _ { k } ^ { \prime * } ] \| } & { } \\ { \displaystyle \leq \sum _ { k = 1 } ^ { m } 4 R ^ { 2 } } & { } \\ { \displaystyle = 4 m R ^ { 2 } . } \end{array} +$$ + +Thus, according to Lemma 23, we have + +$$ +\operatorname* { P r } \left\{ \big \| \sum _ { k = 1 } ^ { m } ( Z _ { k } - \mathbb { E } [ Z _ { k } ] ) \big \| \geq t \right\} = \operatorname* { P r } \Big \{ \big \| \sum _ { k = 1 } ^ { m } ( Z _ { k } ^ { \prime } ) \big \| \geq t \Big \} \leq ( d _ { 1 } + d _ { 2 } ) \exp \Big ( \frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \Big ) . +$$ + +# D.2 MATRIX PERTURBATION BOUNDS + +Perturbation Bound for Singular Vectors For singular vectors, the perturbation is bounded by Wedin’s Theorem. + +Lemma 25 (Wedin’s theorem; Theorem 4.1, p.260 in Stewart & Sun (1990).). Given matrices $A , E \in \mathbb { R } ^ { m \times n }$ with $m \geq n$ . Let $A$ have the singular value decomposition + +$$ +A = [ U _ { 1 } , U _ { 2 } , U _ { 3 } ] \left[ \begin{array} { c c } { { \Sigma _ { 1 } } } & { { 0 } } \\ { { 0 } } & { { \Sigma _ { 2 } } } \\ { { 0 } } & { { 0 } } \end{array} \right] \left[ V _ { 1 } , V _ { 2 } \right] ^ { \top } +$$ + +Let ${ \hat { A } } = A + E$ , with analogous singular value decomposition. Let $\Phi$ be the matrix of canonical angles between the column span of $U _ { 1 }$ and that of $\hat { U } _ { 1 { : } }$ , and $\Theta$ be the matrix of canonical angles between the column span of $V _ { 1 }$ and that of $\hat { V } _ { 1 }$ . Suppose that there exists a $\delta$ such that + +$$ +\operatorname* { m i n } _ { i , j } | [ \Sigma _ { 1 } ] _ { i , i } - [ \Sigma _ { 2 } ] _ { j , j } | > \delta a n d \operatorname* { m i n } _ { i } | [ \Sigma _ { 1 } ] _ { i , i } | > \delta , +$$ + +then + +$$ +\| \sin ( \Phi ) \| ^ { 2 } + \| \sin ( \Theta ) \| ^ { 2 } \leq 2 \frac { \| E \| ^ { 2 } } { \delta ^ { 2 } } . +$$ + +In order to show the robustness of least $k$ right singular vectors of $T$ , we combine Wedin’s theorem with the following Lemma. + +Lemma 26 (Theorem 4.5, p.92 in Stewart & Sun (1990).). Let $\Phi$ be the matrix of canonical angles between the column span of $U$ and that of $\hat { U }$ , then + +$$ +\| P r o j _ { \hat { U } } - P r o j _ { U } \| = \| \sin ( \Phi ) \| . +$$ + +The exact lemma used in our proof is the following corollary in Ge et al. (2015). + +Lemma 27 (Lemma G.5 in Ge et al. (2015)). Given matrix $A , E \in \mathbb { R } ^ { m \times n }$ with $m \geq n$ . Suppose that the $A$ has rank $k$ . Let $s$ and $\hat { S }$ be the subspaces spanned by the first $k$ right singular vectors of $A$ and ${ \hat { A } } = A + E$ , respectively. Then, we have: + +$$ +\| P r o j _ { \hat { S } ^ { \perp } } - P r o j _ { S ^ { \perp } } \| \leq \frac { \sqrt { 2 } \| E \| _ { F } } { \sigma _ { k } ( A ) } . +$$ + +Perturbation Bound for pseudo-inverse With a lowerbound on $\sigma _ { \mathrm { m i n } } ( A )$ , we can get bounds for the perturbation of pseudo-inverse. + +Lemma 28 (Theorem 3.4 in Stewart (1977)). Consider the perturbation of a matrix $A \in \mathbb { R } ^ { m \times n }$ $B = A + E$ . Assume that rank $; ( A ) = r a n k ( B ) = n$ , then + +$$ +\| B ^ { \dagger } - A ^ { \dagger } \| \leq \sqrt { 2 } \| A ^ { \dagger } \| \| B ^ { \dagger } \| \| E \| . +$$ + +The following corollary is particularly useful for us. + +Lemma 29 (Lemma G.8 in Ge et al. (2015)). Consider the perturbation of a matrix $A \in \mathbb { R } ^ { m \times n }$ : $B = A + E$ where $\| E \| \le \sigma _ { \operatorname* { m i n } } ( A ) / 2$ . Assume that $\cdot a n k ( A ) = r a n k ( B ) = n$ , then + +$$ +\| B ^ { \dagger } - A ^ { \dagger } \| \leq 2 \sqrt { 2 } \| E \| / \sigma _ { \operatorname* { m i n } } ( A ) ^ { 2 } . +$$ + +Perturbation Bound for Tensor To lowerbound the leave-one-out distance in augmented distinguishing matrix , we use the following Lemma as the main tool. + +Lemma 30 (Theorem 3.6 in Bhaskara et al. (2014)). For any constant $\delta \in ( 0 , 1 )$ , given any subspace $\nu$ of dimension √ $\delta d ^ { l }$ in $\mathbb { R } ^ { d ^ { l } }$ , there exist vectors $v _ { 1 } , v _ { 2 } , \cdots , v _ { r }$ in $\nu$ with unit norm, such that for random $( \rho / \sqrt { d } )$ -perturbations $\widetilde { x } ^ { ( 1 ) } , \widetilde { x } ^ { ( 2 ) } , \cdot \cdot \cdot , \widetilde { x } ^ { ( l ) } \in \mathbb { R } ^ { d }$ of any vector $x ^ { ( 1 ) } , x ^ { ( 2 ) } , \cdot \cdot \cdot , x ^ { ( l ) } \in \mathbb { R } ^ { d }$ , we know with probability at least $1 - \exp \bigl ( - \delta d ^ { 1 / ( 2 l ) ^ { l } } \bigr )$ ), + +$$ +\exists j \in [ r ] , \langle v _ { j } , \widetilde { x } ^ { ( 1 ) } \otimes \widetilde { x } ^ { ( 2 ) } \otimes \cdots \otimes \widetilde { x } ^ { ( l ) } \rangle \geq \rho ^ { l } ( \frac { 1 } { d } ) ^ { 3 ^ { l } } . +$$ + +For second-order tensor, we have the following corollary. + +Lemma 31. For any constant $\delta \in ( 0 , 1 )$ , given any subspace $\nu$ of dimension $\delta d ^ { 2 } \ i n \ \mathbb { R } ^ { d ^ { 2 } }$ , there exist vectors $v _ { 1 } , v _ { 2 } , \cdots , v _ { r }$ in $\nu$ with unit norm, such that for random $( \rho / \sqrt { d } )$ -perturbations $\widetilde { x } ^ { ( 1 ) } , \widetilde { x } ^ { ( 2 ) } \in$ $\mathbb { R } ^ { d }$ of any vector $\boldsymbol { x } ^ { ( 1 ) } , \boldsymbol { x } ^ { ( 2 ) } \in \mathbb { R } ^ { d }$ , we know with probability at least $1 - \exp ( - \delta d ^ { 1 / 1 6 } )$ , + +$$ +\exists j \in [ r ] , \langle v _ { j } , \widetilde { x } ^ { ( 1 ) } \otimes \widetilde { x } ^ { ( 2 ) } \rangle \geq \rho ^ { 2 } ( \frac { 1 } { d } ) ^ { 9 } . +$$ + +Perturbation Bound for Eigendecomposition Here, We restate some generic results from Bhaskara et al. (2014) on the stability of a matrix’s eigendecomposition under perturbation. Let $M$ and $\hat { M }$ be two $n \times n$ mtrices such that $M = U D U ^ { - 1 }$ and $\hat { M } = M ( I + E ) + F$ . + +Definition 3 (Definition A.1 in Bhaskara et al. (2014)). Let se $\begin{array} { r } { p ( D ) = \operatorname* { m i n } _ { i \neq j } | D _ { i i } - D _ { j j } | . } \end{array}$ . + +The following Lemma guarantees that the eigenvalues of $\hat { M }$ are distinct if the perturbation are not too large. + +Lemma 32 (Lemma A.2 in Bhaskara et al. (2014)). If $\kappa ( U ) ( \| M E \| + \| F \| ) < s e p ( D ) / 2 n ,$ , then the eigenvalues of $\hat { M }$ are distinct and diagonalizable. + +The following Lemma further upperbound the difference between corresponding eigenvectors. + +Lemma 33 (Lemma A.3 in Bhaskara et al. (2014)). Let $u _ { 1 } , . . . , u _ { n }$ and $\hat { u } _ { 1 } , . . . , \hat { u } _ { n }$ respectively be the eigenvectors of $M$ and $\hat { M }$ , ordered by their corresponding eigenvalues. If $\kappa ( U ) ( \| M E \| + \| F \| ) <$ sep(D)/2n, then for all i we have kuˆi − uik ≤ 3 σmax(E)σmax(D)+σmax(F ) . + +In the setting of simultaneous diagonalization, let $N _ { a } = T _ { a } + E _ { a }$ and $N _ { b } = T _ { b } + E _ { b }$ , we have + +$$ +N _ { a } N _ { b } ^ { - 1 } = T _ { a } T _ { b } ^ { - 1 } ( I + F ) + G , +$$ + +where $F = - E _ { b } ( I + T _ { b } ^ { - 1 } E _ { b } ) ^ { - 1 } T _ { b } ^ { - 1 }$ and $G = E _ { a } N _ { b } ^ { - 1 }$ . The following lemma bound the maximum singular value of perturbation matrix $F$ and $G$ . + +Lemma 34 (Claim A.5 in Bhaskara et al. (2014)). σmax(F ) ≤ σmax(Eb)σmin(Tb)−σmax(Eb) and $\sigma _ { \operatorname* { m a x } } ( G ) \leq$ $\frac { \sigma _ { \operatorname* { m a x } } ( E _ { a } ) } { \sigma _ { \operatorname* { m i n } } ( N _ { b } ) }$ + +Alignment of Subspace Basis. Due to the rotation issue, we cannot conclude that $\| S - { \hat { S } } \|$ is small even we know $\| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \|$ is bounded. The following Lemma shows that after appropriate alignment, $S$ is indeed close to $\hat { S }$ . + +Lemma 35 (Lemma 6 in Ge et al. (2017a)). Given matrices $S , \hat { S } \in \mathbb { R } ^ { d \times r }$ , we have + +$$ +\operatorname* { m i n } _ { Z ^ { \top } Z = Z Z ^ { \top } = I _ { r } } \| \hat { S } - S Z \| _ { F } ^ { 2 } \leq \frac { \| S S ^ { \top } - \hat { S } \hat { S } ^ { \top } \| _ { F } ^ { 2 } } { 2 ( \sqrt { 2 } - 1 ) \sigma _ { r } ( S S ^ { \top } ) } +$$ + +D.3 SMALLEST SINGULAR VALUE OF RANDOM MATRICES + +For a random rectangular matrix where each element is an inpdependent Gaussian variable, Rudelson & Vershynin (2009) gives the following result: + +Lemma 36 (Theorem 1.1 in Rudelson & Vershynin (2009)). Let $A \in R ^ { m \times n }$ and suppose that $m \geq n$ . Assume that the entries of $A$ are independent standard Gaussian variable, then for every $\epsilon > 0$ , with probability at least $1 - ( C \epsilon ) ^ { m - n + \bar { 1 } } + e ^ { - C ^ { \prime } n }$ , where $C , C ^ { \prime }$ are two absolute constants, we have: + +$$ +\sigma _ { n } ( A ) \geq \epsilon ( { \sqrt { m } } - { \sqrt { n - 1 } } ) . +$$ + +However, in our setting, we are more interested in fixed matrices perturbed by Gaussian variables. +The smallest singular value of these “perturbed rectangular matrices” can be bounded as follows. + +Lemma 37 (Lemma G.16 in Ge et al. (2015)). Let $A \in \mathbb { R } ^ { m \times n }$ and suppose that $m \geq 3 n$ . If all the entries of $A$ are independently $\rho$ -perturbed to yield $\widetilde { A }$ , then for any $\epsilon > 0$ , with probability at least $1 - ( C \epsilon ) ^ { 0 . 2 5 m }$ , for some absolute constant $C$ , the smallest singular value of $\widetilde { A }$ is bounded below by: + +$$ +\sigma _ { n } ( { \widetilde { A } } ) \geq \epsilon \rho { \sqrt { m } } . +$$ + +# D.4 ANTI-CONCENTRATION + +We use the anti-concentration property for Gaussian random variables in our proof of Lemma 17. Lemma 38 (Anti-concentration in Carbery & Wright (2001)). Let $x \in \mathbb { R } ^ { n }$ be a Gaussian variable $x \in N ( 0 , I )$ , for any polynomial $p ( x )$ of degree $d$ , there exists a constant $\kappa$ such that + +$$ +\begin{array} { r } { \operatorname* { P r } \left[ | p ( x ) | \leq \epsilon \sqrt { V a r [ p ( x ) ] } \right] \leq \kappa \epsilon ^ { 1 / d } . } \end{array} +$$ \ No newline at end of file diff --git a/parse/train/H1xipsA5K7/H1xipsA5K7_content_list.json b/parse/train/H1xipsA5K7/H1xipsA5K7_content_list.json new file mode 100644 index 0000000000000000000000000000000000000000..81906c364942a4cd1682165e8c4f5bee3a63942a --- /dev/null +++ b/parse/train/H1xipsA5K7/H1xipsA5K7_content_list.json @@ -0,0 +1,9601 @@ +[ + { + "type": "text", + "text": "LEARNING TWO-LAYER NEURAL NETWORKS WITH SYMMETRIC INPUTS ", + "text_level": 1, + "bbox": [ + 174, + 98, + 823, + 146 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Rong Ge \nComputer Science Department \nDuke University \nrongge@cs.duke.edu \nRohith Kuditipudi \nComputer Science Department \nDuke University \nrohith.kuditipudi@duke.edu \nZhize Li \nInstitute for Interdisciplinary Information Sciences \nTsinghua University \nzz-li14@mails.tsinghua.edu.cn \nXiang Wang \nComputer Science Department \nDuke University \nxwang@cs.duke.edu ", + "bbox": [ + 184, + 170, + 387, + 226 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "", + "bbox": [ + 557, + 170, + 813, + 226 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "", + "bbox": [ + 183, + 246, + 516, + 303 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "", + "bbox": [ + 571, + 247, + 776, + 303 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "ABSTRACT ", + "text_level": 1, + "bbox": [ + 452, + 339, + 544, + 354 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "We give a new algorithm for learning a two-layer neural network under a general class of input distributions. Assuming there is a ground-truth two-layer network ", + "bbox": [ + 232, + 371, + 764, + 400 + ], + "page_idx": 0 + }, + { + "type": "equation", + "img_path": "images/9a8c1926aee072d5649cc45c80371555ab63870324fe6f6965bf8f7c3c051201.jpg", + "text": "$$\ny = A \\sigma ( W x ) + \\xi ,\n$$", + "text_format": "latex", + "bbox": [ + 434, + 406, + 562, + 424 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "where $A , W$ are weight matrices, $\\xi$ represents noise, and the number of neurons in the hidden layer is no larger than the input or output, our algorithm is guaranteed to recover the parameters $A , W$ of the ground-truth network. The only requirement on the input $x$ is that it is symmetric, which still allows highly complicated and structured input. ", + "bbox": [ + 233, + 431, + 766, + 501 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Our algorithm is based on the method-of-moments framework and extends several results in tensor decompositions. We use spectral algorithms to avoid the complicated non-convex optimization in learning neural networks. Experiments show that our algorithm can robustly learn the ground-truth neural network with a small number of samples for many symmetric input distributions. ", + "bbox": [ + 232, + 503, + 764, + 573 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "1 INTRODUCTION ", + "text_level": 1, + "bbox": [ + 176, + 599, + 336, + 616 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Deep neural networks have been extremely successful in many tasks related to images, videos and reinforcement learning. However, the success of deep learning is still far from being understood in theory. In particular, learning a neural network is a complicated non-convex optimization problem, which is hard in the worst-case. The question of whether we can efficiently learn a neural network still remains generally open, even when the data is drawn from a neural network. Despite a lot of recent effort, the class of neural networks that we know how to provably learn in polynomial time is still very limited, and many results require strong assumptions on the input distribution. ", + "bbox": [ + 174, + 632, + 825, + 729 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "In this paper we design a new algorithm that is capable of learning a two-layer1 neural network for a general class of input distributions. Following standard models for learning neural networks, we assume there is a ground truth neural network. The input data $( x , y )$ is generated by first sampling the input $x$ from an input distribution $\\mathcal { D }$ , then computing $y$ according to the ground truth network that is unknown to the learner. The learning algorithm will try to find a neural network $f$ such that $f ( x )$ is as close to $y$ as possible over the input distribution $\\mathcal { D }$ . Learning a neural network is known to be a hard problem even in some simple settings (Goel et al., 2016; Brutzkus & Globerson, 2017), so we need to make assumptions on the network structure or the input distribution $\\mathcal { D }$ , or both. Many works have worked with a simple input distribution (such as Gaussians) and try to learn more and more complex networks (Tian, 2017; Brutzkus & Globerson, 2017; Li & Yuan, 2017; Soltanolkotabi, 2017; Zhong et al., 2017). However, the input distributions in real life are distributions of very complicated objects such as texts, images or videos. These inputs are highly structured, clearly not Gaussian and do not even have a simple generative model. ", + "bbox": [ + 174, + 736, + 825, + 861 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 823, + 160 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "We consider a type of two-layer neural network, where the output $y$ is generated as ", + "bbox": [ + 178, + 166, + 717, + 181 + ], + "page_idx": 1 + }, + { + "type": "equation", + "img_path": "images/15817c53b58dfc1008efb524331a52a5fdfb2c782bb95d2c7b7a5515506512a2.jpg", + "text": "$$\ny = A \\sigma ( W x ) + \\xi .\n$$", + "text_format": "latex", + "bbox": [ + 434, + 184, + 562, + 200 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Here $x \\in \\mathbb { R } ^ { d }$ is the input, $W \\in \\mathbb { R } ^ { k \\times d }$ and $A \\in \\mathbb { R } ^ { k \\times k }$ are two weight matrices2. The function $\\sigma$ is the standard ReLU activation function $\\sigma ( x ) = \\operatorname* { m a x } \\{ x , 0 \\}$ applied entry-wise to the vector $W x$ , and $\\xi$ is a noise vector that has $\\mathbb { E } [ \\xi ] = 0$ and is independent of $x$ . Although the network only has two layers, learning similar networks is far from trivial: even when the input distribution is Gaussian, Ge et al. (2017b) and Safran & Shamir (2018) showed that standard optimization objective can have bad local optimal solutions. Ge et al. (2017b) gave a new and more complicated objective function that does not have bad local minima. ", + "bbox": [ + 173, + 209, + 825, + 309 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "For the input distribution $\\mathcal { D }$ , our only requirement is that $\\mathcal { D }$ is symmetric. That is, for any $x \\in \\mathbb { R } ^ { d }$ , the probability of observing $x \\sim \\mathcal { D }$ is the same as the probability of observing $- x \\sim \\mathcal { D }$ . A symmetric distribution can still be very complicated and cannot be represented by a finite number of parameters. In practice, one can often think of the symmetry requirement as a “factor- $2 ^ { \\circ }$ approximation to an arbitrary input distribution: if we have arbitrary training samples, it is possible to augment the input data with their negations to make the input distribution symmetric, and it should take at most twice the effort in labeling both the original and augmented data. In many cases (such as images) the augmented data can be interpreted (for images it will just be negated colors) so reasonable labels can be obtained. ", + "bbox": [ + 173, + 315, + 825, + 440 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "1.1 OUR RESULTS ", + "text_level": 1, + "bbox": [ + 176, + 457, + 313, + 470 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "When the input distribution is symmetric, we give the first algorithm that can learn a two-layer neural network. Our algorithm is based on the method-of-moments approach: first estimate some correlations between $x$ and $y$ , then use these information to recover the model parameters. More precisely we have ", + "bbox": [ + 174, + 483, + 825, + 539 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Theorem 1 (informal). If the data is generated according to Equation (1), and the input distribution $x \\sim \\mathcal { D }$ is symmetric. Given exact correlations between $x , y$ of order at most 4, as long as $A , W$ and input distribution are not degenerate, there is an algorithm that runs in $p o l y ( d )$ time and outputs a network ${ \\hat { A } } , { \\hat { W } }$ of the same size that is effectively the same as the ground-truth network: for any input $x$ , $\\hat { A } \\sigma ( \\hat { W } x ) = A \\sigma ( W x )$ . ", + "bbox": [ + 174, + 541, + 825, + 617 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Of course, in practice we only have samples of $( x , y )$ and cannot get the exact correlations. However, our algorithm is robust to perturbations, and in particular can work with polynomially many samples. ", + "bbox": [ + 173, + 626, + 823, + 655 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Theorem 2 (informal). If the data is generated according to Equation (1), and the input distribution $x \\sim \\mathcal { D }$ is symmetric. As long as the weight matrices $A , W$ and input distributions are not degenerate, there is an algorithm that uses poly $( d , 1 / \\epsilon )$ time and number of samples and outputs a network ${ \\hat { A } } , { \\hat { W } }$ of the same size that computes an \u000f-approximation function to the ground-truth network: for any input $x$ , $\\| \\hat { A } \\sigma ( \\hat { W } x ) - A \\sigma ( W x ) \\| ^ { 2 } \\leq \\epsilon .$ . ", + "bbox": [ + 174, + 657, + 825, + 733 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "In fact, the algorithm recovers the original parameters $A , W$ up to scaling and permutations. Here when we say weight matrices are not degenerate, we mean that the matrices $A , W$ should be full rank, and in addition a certain distinguishing matrix that we define later in Section 2 is also full rank. We justify these assumptions using the smoothed analysis framework (Spielman & Teng, 2004). ", + "bbox": [ + 173, + 742, + 825, + 799 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "In smoothed analysis, the input is not purely controlled by an adversary. Instead, the adversary can first generate an arbitrary instance (in our case, arbitrary weight matrices $W , A$ and symmetric input distribution $\\mathcal { D }$ ), and the parameters for this instance will be randomly perturbed to yield a perturbed instance. The algorithm only needs to work with high probability on the perturbed instance. This limits the power of the adversary and prevents it from creating highly degenerate cases (e.g. choosing the weight matrices to be much lower rank than $k$ ). Roughly speaking, we show ", + "bbox": [ + 173, + 804, + 825, + 888 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Theorem 3 (informal). There is a simple way to perturb the input distribution, $W$ and $A$ such that with high probability, the distance between the perturbed instance and original instance is at most $\\lambda ,$ , and our algorithm outputs an \u000f-approximation to the perturbed network with poly $( d , 1 / \\lambda , 1 / \\epsilon )$ time and number of samples. ", + "bbox": [ + 174, + 103, + 823, + 160 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "In the rest of the paper, we will first review related works. Then in Section 2 we formally define the network and introduce some notations. Our algorithm is given in Section 3. Finally in Section 4 we run experiments to show that the algorithm can indeed learn the two-layer network efficiently and robustly. The experiments show that our algorithm works robustly with reasonable number of samples for different (symmetric) input distributions and weight matrices. Due to space constraints, the proof for polynomial number of samples (Theorem 2) and smoothed analysis (Theorem 3) are deferred to the appendix. ", + "bbox": [ + 174, + 176, + 825, + 273 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "1.2 RELATED WORK ", + "text_level": 1, + "bbox": [ + 176, + 301, + 330, + 315 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "There are many works in learning neural networks, and they come in many different styles. ", + "bbox": [ + 173, + 332, + 767, + 347 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Non-standard Networks Some works focus on networks that do not use standard activation functions. Arora et al. (2014) gave an algorithm that learns a network with discrete variables. Livni et al. (2014) and follow-up works learn neural networks with polynomial activation functions. Oymak & Soltanolkotabi (2018) used the rank-1 tensor decomposition for learning a non-overlapping convolutional neural network with differentiable and smooth activation and Gaussian input. ", + "bbox": [ + 174, + 372, + 823, + 443 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "ReLU network, Gaussian input When the input is Gaussian, Ge et al. (2017b) showed that for a two-layer neural network, although the standard objective does have bad local optimal solutions, one can construct a new objective whose local optima are all globally optimal. Several other works (Tian, 2017; Du et al., 2017b; Brutzkus & Globerson, 2017; Li & Yuan, 2017; Soltanolkotabi, 2017; Zhong et al., 2017; Zhang et al., 2018) extend this to different settings. ", + "bbox": [ + 174, + 459, + 825, + 530 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "General input with score functions A closely related work (Janzamin et al., 2015) does not require the input distribution to be Gaussian, but still relies on knowing the score function of the input distribution (which in general cannot be estimated efficiently from samples). Recently, Gao et al. (2018) gave a way to design loss functions with desired properties for one-hidden-layer neural networks with general input distributions based on a new proposed local likelihood score function estimator. For general distributions (including symmetric ones) their estimator can still require number of samples that is exponential in dimension $d$ (as in Assumption 1(d)). ", + "bbox": [ + 174, + 546, + 825, + 643 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "General input distributions There are several lines of work that try to extend the learning results to more general distributions. Du et al. (2017a) showed how to learn a single neuron or a single convolutional filter under some conditions for the input distribution. Daniely et al. (2016); Zhang et al. (2016; 2017); Goel & Klivans (2017); Du & Goel (2018) used kernel methods to learn neural networks when the norm of the weights and input distributions are both bounded (and in general the running time and sample complexity in this line of work depend exponentially on the norms of weights/input). Recently, Du et al. (2018) showed that gradient descent minimizes the training error in an over-parameterized two-layer neural network. They only consider training error while our results also apply to testing error. The work that is most similar to our setting is Goel et al. (2018), where they showed how to learn a single neuron (or a single convolutional filter) for any symmetric input distribution. Our two-layer neural network model is much more complicated. ", + "bbox": [ + 173, + 660, + 825, + 814 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Method-of-Moments and Tensor Decomposition Our work uses method-of-moments, which has already been applied to learn many latent variable models (see Anandkumar et al. (2014) and references there). The particular algorithm that we use is inspired by an over-complete tensor decomposition algorithm FOOBI (De Lathauwer et al., 2007). Our smoothed analysis results are inspired by Bhaskara et al. (2014) and Ma et al. (2016), although our setting is more complicated and we need several new ideas. ", + "bbox": [ + 174, + 840, + 823, + 922 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "2 PRELIMINARIES ", + "text_level": 1, + "bbox": [ + 176, + 102, + 339, + 118 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "In this section, we first describe the neural network model that we learn, and then introduce notations related to matrices and tensors. Finally we will define distinguishing matrix, which is a central object in our analysis. ", + "bbox": [ + 174, + 132, + 825, + 176 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "2.1 NETWORK MODEL ", + "text_level": 1, + "bbox": [ + 174, + 191, + 344, + 207 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "We consider two-layer neural networks with $d$ -dimensional input, $k$ hidden units and $k$ -dimensional output, as shown in Figure 1. We assume that $k \\leq d$ . The input of the neural network is denoted by $\\mathbf { \\bar { \\Phi } } _ { x } \\in \\mathbb { R } ^ { d }$ . Assume that the input $x$ is i.i.d. drawn from a symmetric distribution $\\mathcal { D } ^ { 3 }$ . Let the two weight matrices in the neural network be $W \\in \\mathbb { R } ^ { k \\times d }$ and $\\mathbf { \\bar { A } } \\in \\mathbb { R } ^ { k \\times k }$ . The output $\\boldsymbol { y } \\in \\mathbb { R } ^ { k }$ is generated as follows: ", + "bbox": [ + 173, + 218, + 825, + 286 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/ac1ce24786bb73b62431d98a04b24c88c036e893b126372443a6870ad911fac2.jpg", + "text": "$$\ny = A \\sigma ( W x ) + \\xi ,\n$$", + "text_format": "latex", + "bbox": [ + 434, + 286, + 562, + 303 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where $\\sigma ( \\cdot )$ is the element-wise ReLU function and $\\xi \\in \\mathbb { R } ^ { k }$ is zero-mean random noise, which is independent with input $x$ . Let the value of hidden units be $\\boldsymbol { h } \\in \\mathbb { R } ^ { k }$ , which is equal to $\\sigma ( W x )$ . Denote $i$ -th row of matrix $W$ as $\\boldsymbol { w _ { i } ^ { \\intercal } }$ $( i = 1 , 2 , . . . , k )$ . Also, let $i$ -th column of matrix $A$ be $a _ { i }$ $( i = 1 , 2 , . . . , k )$ . By property of ReLU activations, for any constant $c > 0$ , scaling the $i$ -th row of $W$ by $c$ while scaling the $i$ -th column of $A$ by $1 / c$ does not change the function computed by the network. Therefore without loss of generality, we assume every row vector of $W$ has unit norm. ", + "bbox": [ + 174, + 304, + 825, + 390 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/d7d52ceb8f5a44ad3c0447a21f73946bc72a42e5122b8ba7851caab4d20f07c9.jpg", + "text": "$$\n\\begin{array} { r l } & { \\quad \\displaystyle \\sum _ { j = \\pm \\infty } \\sum _ { s = \\pm 1 } ^ { \\infty } y = A h + \\xi } \\\\ & { \\quad \\displaystyle \\sum _ { j = \\pm \\infty } \\sum _ { w _ { 1 } ^ { \\intercal } \\big ( \\frac { \\partial } { \\partial \\omega _ { 2 } ^ { \\intercal } } , \\therefore \\cdot \\cdot \\cdot w _ { k } ^ { \\intercal } \\big ( \\frac { \\partial } { \\partial \\omega } \\big ) \\big ) \\ } A = \\mathbb { R } ^ { k \\times k } } \\\\ & { \\quad \\quad \\displaystyle \\sum _ { j = \\pm \\infty } \\sum _ { s = \\pm \\pm \\infty } \\mathbb { W } \\in \\mathbb { R } ^ { k \\times d } } \\\\ & { \\quad \\quad \\quad \\displaystyle \\sum _ { j = \\pm \\pm \\infty } \\mathbb { 1 } _ { \\substack { \\left( \\frac { \\partial } { \\partial \\omega _ { 2 } ^ { \\intercal } } \\cdot \\cdot \\cdot \\cdot \\cdot \\right) \\big ( \\frac { \\partial } { \\partial \\omega _ { 1 } ^ { \\intercal } } \\circ \\mathcal { D } \\big ) \\ } } x = \\mathbb { 1 } _ { \\AA } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 349, + 398, + 645, + 506 + ], + "page_idx": 3 + }, + { + "type": "image", + "img_path": "", + "image_caption": [ + "Figure 1: Network model. " + ], + "image_footnote": [], + "page_idx": 3 + }, + { + "type": "text", + "text": "2.2 NOTATIONS ", + "text_level": 1, + "bbox": [ + 174, + 553, + 295, + 568 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "We use $[ n ]$ to denote the set $\\{ 1 , 2 , \\cdots , n \\}$ . For two random variables $X$ and $Y$ , we say $X \\ { \\overset { d } { = } } \\ Y$ if they come from the same distribution. ", + "bbox": [ + 173, + 579, + 825, + 609 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "In the vector space $\\mathbb { R } ^ { n }$ , we use $\\langle \\cdot , \\cdot \\rangle$ to denote the inner product of two vectors, and use $\\| \\cdot \\|$ to denote the Euclidean norm. We use $e _ { i }$ to denote the $i$ -th standard basis vector. For a matrix $A \\in \\mathbb { R } ^ { m \\times n }$ , let $A _ { [ i , : ] }$ denote its $i$ -th row vector, and let $A _ { [ : , j ] }$ denote its $j$ -th column vector. Let $A$ ’s singular values be $\\ddot { \\sigma _ { 1 } } ( A ) \\geq \\sigma _ { 2 } ( A ) \\geq \\cdot \\cdot \\cdot \\geq \\sigma _ { \\operatorname* { m i n } ( m , n ) } ( \\stackrel { \\cdot } { A } )$ , and denote the smallest singular value be $\\sigma _ { \\mathrm { m i n } } ( A ) =$ $\\sigma _ { \\mathrm { m i n } ( m , n ) } ( A )$ . The condition number of matrix $A$ is defined as $\\kappa ( A ) : = \\sigma _ { 1 } ( A ) / \\sigma _ { \\mathrm { m i n } } ( A )$ . We use $I _ { n }$ to denote the identity matrix with dimension $n \\times n$ . The spectral norm of a matrix is denoted as $\\| \\cdot \\|$ , and the Frobenius norm as $\\| \\cdot \\| _ { F }$ . ", + "bbox": [ + 173, + 616, + 825, + 718 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "We represent a $d$ -dimensional linear subspace $s$ by a matrix $S \\in \\mathbb { R } ^ { n \\times d }$ , whose columns form an orthonormal basis for subspace $s$ . The projection matrix onto the subspace $s$ is denoted by $\\mathrm { P r o j } _ { S } = S S ^ { \\top }$ , and the projection matrix onto the orthogonal subspace of $s$ is denoted by $\\mathrm { P r o j } _ { S ^ { \\perp } } =$ $I _ { n } - S S ^ { \\top }$ . ", + "bbox": [ + 173, + 723, + 825, + 781 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "For matrix $A \\ \\in \\ \\mathbb { R } ^ { m _ { 1 } \\times n _ { 1 } } , C \\ \\in \\ R ^ { m _ { 2 } \\times n _ { 2 } }$ , let the Kronecker product of $A$ and $C$ be $A \\otimes C \\in$ $\\mathbb { R } ^ { m _ { 1 } m _ { 2 } \\times n _ { 1 } n _ { 2 } }$ , which is defined as $( A \\otimes C ) _ { ( i _ { 1 } , i _ { 2 } ) , ( j _ { 2 } , j _ { 2 } ) } = A _ { i _ { 1 } , i _ { 2 } } C _ { j _ { 1 } , j _ { 2 } }$ . For a vector $x \\in \\mathbb { R } ^ { d }$ , the Kronecker product $x \\otimes x$ has dimension $d ^ { 2 }$ . We denote the $p$ -fold Kronecker product of $x$ as $x ^ { \\otimes p }$ , which has dimension $d ^ { p }$ . ", + "bbox": [ + 173, + 786, + 825, + 845 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "We often need to convert between vectors and matrices. For a matrix $A \\in \\mathbb { R } ^ { m \\times n }$ , let $\\operatorname { v e c } ( A ) \\in \\mathbb { R } ^ { m n }$ be the vector obtained by stacking all the columns of $A$ . For a vector $a \\in \\mathbb { R } ^ { m ^ { 2 } }$ , let $\\mathrm { m a t } ( x ) \\ \\in$ $\\mathbb { R } ^ { m \\times m }$ denote the inverse mapping such that vec $( \\operatorname* { m a t } ( a ) ) = a$ . Let $\\mathbb { R } _ { s y m } ^ { k \\times k }$ be the space of all $k \\times k$ symmetric matrices, which has dimension ${ \\binom { k } { 2 } } + k$ . For convenience, we denote $k _ { 2 } = { \\binom { k } { 2 } }$ . For a symmetric matrix $B \\in \\mathbb { R } _ { s y m } ^ { k \\times k }$ , we denote $\\mathrm { v e c } ^ { * } ( B ) \\in \\mathbb { R } ^ { k _ { 2 } + k }$ as the vector obtained by stacking all the upper triangular entries (including diagonal entries) of $B$ . Note that $\\mathrm { v e c } ( B )$ still has dimension $k ^ { 2 }$ . For a vector $b \\in \\mathbb { R } ^ { k _ { 2 } + k }$ , let $\\mathrm { m a t } ^ { - } ( b ) \\ \\bar { \\in } \\ \\mathbb { R } _ { s y m } ^ { k \\times k }$ denote the inverse mapping of $\\mathrm { v e c } ^ { * } ( \\cdot )$ such that $\\mathrm { v e c } ^ { * } ( \\mathrm { m a t } ^ { * } ( B ) ) = b$ . ", + "bbox": [ + 174, + 852, + 825, + 900 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 102, + 825, + 181 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "2.3 DISTINGUISHING MATRIX ", + "text_level": 1, + "bbox": [ + 176, + 195, + 397, + 210 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "A central object in our analysis is a large matrix whose columns are closely related to pairs of hidden variables. We call this the distinguishing matrix and define it below: ", + "bbox": [ + 174, + 222, + 823, + 251 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Definition 1. Given a weight matrix $W$ of the first layer, and the input distribution $\\mathcal { D }$ , the distinguishing matrix $N ^ { \\mathcal { D } } \\in \\mathbb { R } ^ { d ^ { 2 } \\times k _ { 2 } }$ is a matrix whose columns are indexed by $i j$ where $1 \\leq i < j \\leq k$ and ", + "bbox": [ + 173, + 253, + 823, + 296 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/04d1f57b5a15873c62699bbfc5e96a319585c837afdd372d2a38dcaa45280719.jpg", + "text": "$$\nN _ { i j } ^ { D } = \\mathbb { E } _ { x \\sim \\mathcal { D } } \\left[ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\right] .\n$$", + "text_format": "latex", + "bbox": [ + 313, + 295, + 684, + 315 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Another related concept is the augmented distinguishing matrix $M$ , which is a $d ^ { 2 } \\times ( k _ { 2 } + 1 )$ matrix whose first $k _ { 2 }$ columns are exactly the same as distinguishing matrix $N$ , and the last column (indexed by 0) is defined as ", + "bbox": [ + 174, + 318, + 825, + 359 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/7b8be29a8a0ea61a5658330efbb15e81a0e71502bf4132ed3896547c6d303089.jpg", + "text": "$$\nM _ { 0 } ^ { D } = \\mathbb { E } _ { x \\sim { D } } [ x \\otimes x ] .\n$$", + "text_format": "latex", + "bbox": [ + 423, + 357, + 573, + 377 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "For both matrices, when the input distribution is clear from context we use $N$ or $M$ and omit the superscript. ", + "bbox": [ + 171, + 378, + 823, + 406 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "The exact reason for these definitions will only be clear after we explain the algorithm in Section 3. Our algorithm will require that these matrices are robustly full rank, in the sense that $\\sigma _ { m i n } ( M )$ is lowerbounded. Intuitively, every column $N _ { i j } ^ { \\mathcal { D } }$ looks at the expectation over samples that have opposite signs for weights $w _ { i } , w _ { j }$ $( w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq \\bar { 0 }$ , hence the name distinguishing matrix). ", + "bbox": [ + 173, + 416, + 825, + 478 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Requiring $M$ and $N$ to be full rank prevents several degenerate cases. For example, if two hidden units are perfectly correlated and always share the same sign for every input, this is very unnatural and requiring the distinguishing matrix to be full rank prevents such cases. Later in Section C we will also show that requiring a lowerbound on $\\sigma _ { m i n } ( M )$ is not unreasonable: in the smoothed analysis setting where the nature can make a small perturbation on the input distribution $\\mathcal { D }$ , we show that for any input distribution $\\mathcal { D }$ , there exists simple perturbations $\\mathcal { D } ^ { \\prime }$ that are arbitrarily close to $\\mathcal { D }$ such that $\\sigma _ { m i n } ( M ^ { D ^ { \\prime } } )$ is lowerbounded. ", + "bbox": [ + 173, + 483, + 825, + 583 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "3 OUR ALGORITHM ", + "text_level": 1, + "bbox": [ + 176, + 603, + 354, + 619 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "In this section, we describe our algorithm for learning the two-layer networks defined in Section 2.1. As a warm-up, we will first consider a single-layer neural network and recover the results in Goel et al. (2018) using method-of-moments. This will also be used as a crucial step in our algorithm. Due to space constraints we will only introduce algorithm and proof ideas, the detailed proof is deferred to Section A in appendix. Throughout this section, when we use $\\mathbb { E } [ \\cdot ]$ without further specification the expectation is over the randomness $x \\sim \\mathcal { D }$ and the noise $\\xi$ . ", + "bbox": [ + 173, + 633, + 825, + 718 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "3.1 WARM-UP: LEARNING SINGLE-LAYER NETWORKS", + "text_level": 1, + "bbox": [ + 174, + 734, + 566, + 750 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "We will first give a simple algorithm for learning a single-layer neural network. More precisely, suppose we are given samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ where $x _ { i } \\sim \\mathcal { D }$ comes from a symmetric distribution, and the output $y _ { i }$ is computed by ", + "bbox": [ + 173, + 761, + 825, + 804 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/0c505f3c378cad8adc582fa973ed2bd28ed8ccac091f91302f9f14c807e8458b.jpg", + "text": "$$\ny _ { i } = \\sigma ( w ^ { \\top } x _ { i } ) + \\xi _ { i } .\n$$", + "text_format": "latex", + "bbox": [ + 429, + 809, + 566, + 827 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Here $\\xi _ { i }$ ’s are i.i.d. noises that satisfy $\\mathbb { E } [ \\xi _ { i } ] = 0$ . Noise $\\xi _ { i }$ is also assumed to be independent with input $x _ { i }$ . The goal is to learn the weight vector $w$ . ", + "bbox": [ + 173, + 832, + 825, + 861 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "The idea of the algorithm is simple: we will estimate the correlations between $x$ and $y$ and the covariance of $x$ , and then recover the hidden vector $w$ using these two estimates. The main challenge here is that $y$ is not a linear function on $x$ . Goel et al. (2018) gave a crucial observation that allows us to deal with the non-linearity: ", + "bbox": [ + 174, + 867, + 825, + 924 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Algorithm 1 Learning Single-layer Neural Networks ", + "text_level": 1, + "bbox": [ + 173, + 103, + 524, + 118 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Input: Samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ generated according to Equation (3). Output: Estimate of weight vector $w$ . \n1: Estimate $\\begin{array} { r } { v = \\frac { 1 } { n } \\sum _ { i = 1 } ^ { n } y _ { i } x _ { i } } \\end{array}$ \n2: Estimate $\\begin{array} { r } { C = \\frac { 1 } { n } \\sum _ { i = 1 } ^ { n } x _ { i } x _ { i } ^ { \\top } } \\end{array}$ \n3: return $2 C ^ { - 1 } v$ . ", + "bbox": [ + 176, + 121, + 669, + 196 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Lemma 1. Suppose $x \\sim \\mathcal { D }$ comes from a symmetric distribution and $y$ is computed as in (3), then ", + "bbox": [ + 169, + 224, + 818, + 241 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/3adee91007156011c63c08b1610c01fada501f2d4d431eeb3792325c0aef3d13.jpg", + "text": "$$\n\\mathbb { E } [ y x ] = \\frac { 1 } { 2 } \\mathbb { E } [ x x ^ { \\top } ] w .\n$$", + "text_format": "latex", + "bbox": [ + 428, + 247, + 570, + 277 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Importantly, the right hand side of Lemma 1 does not contain the ReLU function $\\sigma$ . This is true because if $x$ comes from a symmetric distribution, averaging between $x$ and $- x$ can get rid of nonlinearities like ReLU or leaky-ReLU. Later we will prove a more general version of this lemma (Lemma 6). ", + "bbox": [ + 173, + 290, + 825, + 348 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Using this lemma, it is immediate to get a method-of-moments algorithm for learning $w$ : we just need to estimate $\\mathbb { E } [ y x ]$ and $\\mathbb { E } [ x x ^ { \\top } ]$ , then we know $\\boldsymbol { w } = 2 ( \\mathbb { E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ) ^ { \\top 1 } \\mathbb { E } [ \\boldsymbol { y } \\boldsymbol { x } ]$ . This is summarized in Algorithm 1. ", + "bbox": [ + 173, + 354, + 825, + 397 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "3.2 LEARNING TWO-LAYER NETWORKS ", + "text_level": 1, + "bbox": [ + 176, + 415, + 465, + 429 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "In order to learn the weights of the network defined in Section 2.1, a crucial observation is that we have $k$ outputs as well as $k$ hidden-units. This gives a possible way to reduce the two-layer problem to the single-layer problem. For simplicity, we will consider the noiseless case in this section, where ", + "bbox": [ + 173, + 440, + 826, + 484 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/984beca516ae8fd82b00dac9886434dd65b6aecfe781af2d1e838fdbe30c2d83.jpg", + "text": "$$\ny = A \\sigma ( W x ) .\n$$", + "text_format": "latex", + "bbox": [ + 449, + 497, + 549, + 513 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Let $u \\in \\mathbb { R } ^ { k }$ be a vector and consider $u ^ { \\top } y$ , it is clear that $u ^ { \\top } y = ( u ^ { \\top } A ) \\sigma ( \\underline { { W } } x )$ . Let $z _ { i }$ be the normalized version $i$ -th row of $A ^ { - 1 }$ , then we know $z _ { i }$ has the property that $\\dot { z } _ { i } ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }$ where $\\lambda _ { i } > 0$ is a constant and $e _ { i }$ is a basis vector. ", + "bbox": [ + 173, + 525, + 825, + 568 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The key observation here is that if $u = z _ { i }$ , then $u ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }$ . As a result, $u ^ { \\top } y = \\lambda _ { i } e _ { i } ^ { \\top } \\sigma ( W x ) =$ $\\sigma ( \\lambda _ { i } w _ { i } ^ { \\top } x )$ is the output of a single-layer neural network with weight equal to $\\lambda _ { i } w _ { i }$ . If we know all the vectors $\\{ z _ { 1 } , . . . , z _ { k } \\}$ , the input/output pairs $( x , z _ { i } ^ { \\top } y )$ correspond to single-layer networks with weight vectors $\\{ \\lambda _ { i } w _ { i } \\}$ . We can then apply the algorithm in Section 3.1 (or the algorithm in Goel et al. (2018)) to learn the weight vectors. ", + "bbox": [ + 173, + 573, + 825, + 648 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "When $u ^ { \\top } A = \\lambda _ { i } e _ { i }$ , we say that $u ^ { \\top } y$ is a pure neuron. Next we will design an algorithm that can find all vectors $\\left\\{ z _ { i } \\right\\}$ ’s that generate pure neurons, and therefore reduce the problem of learning a two-layer network to learning a single-layer network. ", + "bbox": [ + 173, + 654, + 825, + 696 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Pure Neuron Detector In order to find the vector $u$ that generates a pure neuron, we will try to find some property that is true if and only if the output can be represented by a single neuron. ", + "bbox": [ + 174, + 713, + 820, + 742 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Intuitively, using ideas similar to Lemma 1 we can get a property that holds for all pure neurons: ", + "bbox": [ + 169, + 748, + 805, + 763 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Lemma 2. Suppose $\\boldsymbol { \\hat { y } } = \\sigma ( \\boldsymbol { w } ^ { \\top } \\boldsymbol { x } )$ , then $\\begin{array} { r } { \\mathbb { E } [ \\hat { y } ^ { 2 } ] = \\frac { 1 } { 2 } w ^ { \\top } \\mathbb { E } [ x x ^ { \\top } ] w , } \\end{array}$ , and $\\begin{array} { r } { \\mathbb { E } [ \\hat { y } x ] = \\frac { 1 } { 2 } \\mathbb { E } [ x x ^ { \\top } ] w } \\end{array}$ . As $a$ result we have ", + "bbox": [ + 173, + 766, + 823, + 795 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/5dfa70cfbd0cfa224e8322e91489425276477b52c3889a53227cb0b5f4f4288a.jpg", + "text": "$$\n\\mathbb { E } [ \\hat { y } ^ { 2 } ] = 2 \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { y } x ] .\n$$", + "text_format": "latex", + "bbox": [ + 383, + 794, + 612, + 814 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "As before, the ReLU activation does not appear because of the symmetric input distribution. For $\\hat { y } = u ^ { \\top } y$ , we can estimate all of these moments $( \\mathbb { E } [ \\hat { y } ^ { 2 } ] , \\mathbb { E } [ \\hat { y } x ^ { \\top } ] , \\bar { \\mathbb { E } } [ x x ^ { \\top } ] )$ using samples and check whether this condition is satisfied. However, the problem with this property is that even if $z = u ^ { \\top } y$ is not pure, it may still satisfy the property. More precisely, if $\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) } \\end{array}$ , then we have ", + "bbox": [ + 173, + 825, + 825, + 886 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/7c77d5af033fbb312d9fb36c1b2cd03b78c1a5e3004c9f9ee835ab8e08fcadf1.jpg", + "text": "$$\n2 \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { y } x ] - \\mathbb { E } [ \\hat { y } ^ { 2 } ] = \\sum _ { 1 \\leq i < j \\leq k } c _ { i } c _ { j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ]\n$$", + "text_format": "latex", + "bbox": [ + 217, + 892, + 779, + 929 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The additional terms may accidentally cancel each other which leads to a false positive. To address this problem, we consider a higher order moment: ", + "bbox": [ + 173, + 103, + 825, + 132 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Lemma 3. Suppose $\\boldsymbol { \\hat { y } } = \\sigma ( \\boldsymbol { w } ^ { \\top } \\boldsymbol { x } )$ , then ", + "bbox": [ + 173, + 136, + 434, + 151 + ], + "page_idx": 6 + }, + { + "type": "equation", + "img_path": "images/6a40e644650ce5d69fa1da6c2e4a95a95efe6438997c2569bf48135a1ee17cd0.jpg", + "text": "$$\n\\begin{array} { r } { \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ] = 2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 310, + 159, + 687, + 179 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Moreover, if $\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) } \\end{array}$ where $c \\in \\mathbb { R } ^ { k }$ is a $k$ -dimensional vector, we have ", + "bbox": [ + 173, + 188, + 723, + 205 + ], + "page_idx": 6 + }, + { + "type": "equation", + "img_path": "images/e261d5a7ab283270bd9a0b80d0dfd09af67acec9f8e91d2858a3aea5d53de809.jpg", + "text": "$$\n2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ] = \\sum _ { 1 \\leq i < j \\leq k } c _ { i } c _ { j } N _ { i j } .\n$$", + "text_format": "latex", + "bbox": [ + 246, + 212, + 750, + 247 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Here $N _ { i j }$ ’s are columns of the distinguishing matrix defined in Definition $I$ ", + "bbox": [ + 173, + 253, + 666, + 268 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "The important observation here is that there are $\\begin{array} { r l r } { k _ { 2 } } & { { } \\ = \\ } & { \\left( \\begin{array} { c } { k } \\\\ { 2 } \\end{array} \\right) } \\end{array}$ extra terms in $2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ]$ that are multiples of $N _ { i j }$ , which are $d ^ { 2 }$ (or $\\binom { d + 1 } { 2 }$ considering their symmetry) dimensional objects. When the distinguishing matrix is full rank, we know its columns $N _ { i j }$ are linearly independent. In that case, if the sum of the extra terms is 0, then the coefficient in front of each $N _ { i j }$ must also be 0. The coefficients are $c _ { i } c _ { j }$ which will be non-zero if and only if both $c _ { i } , c _ { j }$ are non-zero, therefore to make all the coefficients 0 at most one of $\\left\\{ c _ { i } \\right\\}$ can be non-zero. This is summarized in the following Corollary: ", + "bbox": [ + 173, + 281, + 826, + 387 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Corollary 1 (Pure Neuron Detector). Define $\\begin{array} { r } { f ( u ) : = 2 \\mathbb { E } \\left[ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] } \\end{array}$ $- \\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) ]$ . Suppose the distinguishing matrix is full rank, if $\\dot { f } ( u ) = 0$ for unit vector $u$ , then u must be equal to one of $\\pm z _ { i }$ . ", + "bbox": [ + 173, + 391, + 841, + 438 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "We will call the function $f ( u )$ a pure neuron detector, as $u ^ { \\top } y$ is a pure neuron if and only if $f ( u ) =$ 0. Therefore, to finish the algorithm we just need to find all solutions for $f ( u ) = 0$ . ", + "bbox": [ + 173, + 449, + 825, + 478 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Linearization The main obstacle in solving the system of equations $f ( u ) = 0$ is that every entry of $f ( u )$ is a quadratic function in $u$ . The system of equations $f ( u ) = 0$ is therefore a system of quadratic equations. Solving a generic system of quadratic equations is NP-hard. However, in our case this can be solved by a technique that is very similar to the FOOBI algorithm for tensor decomposition (De Lathauwer et al., 2007). The key idea is to linearize the function by thinking of each degree 2 monomial $u _ { i } u _ { j }$ as a separate variable. Now the number of variables is $k _ { 2 } + k = { \\binom { k } { 2 } } + k$ and $f$ is linear in this space. In other words, there exists a matrix $T \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }$ such that $T \\mathrm { v e c } ^ { * } ( u u _ { - } ^ { \\top } ) = f ( u )$ . Clearly, if $u ^ { \\top } y$ is a pure neuron, then $T \\mathrm { v e c } ^ { * } ( u u ^ { \\top } ) = f ( u ) = 0$ . That is, $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ are all in the nullspace of $T$ . Later in Section A we will prove that the nullspace of $T$ consists of exactly these vectors (and their combinations): ", + "bbox": [ + 173, + 493, + 826, + 638 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Lemma 4. Let $T$ be the unique $\\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }$ matrix that satisfies $T \\nu e c ^ { * } ( u u ^ { \\top } ) = f ( u )$ (where $f ( u )$ is defined as in Corollary $I$ ), suppose the distinguishing matrix is full rank, then the nullspace of $T$ is exactly the span of $\\{ \\nu e c ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ . ", + "bbox": [ + 173, + 643, + 825, + 690 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Based on Lemma 4, we can just estimate the tensor $T$ from the samples we are given, and its smallest singular directions would give us the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ . ", + "bbox": [ + 173, + 700, + 823, + 731 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Finding $z _ { i }$ ’s from span of $z _ { i } z _ { i } ^ { \\top }$ ’s In order to reduce the problem to a single-layer problem, the final step is to find $z _ { i }$ ’s from span of $z _ { i } z _ { i } ^ { \\top }$ ’s. This is also a step that has appeared in FOOBI and more generally other tensor decomposition algorithms, and can be solved by a simultaneous diagonalization. Let $Z$ be the matrix whose rows are $z _ { i }$ ’s, which means $Z = \\mathrm { d i a g } ( \\lambda ) A ^ { - 1 }$ . Let $X = \\breve { Z } ^ { \\top } D _ { X } Z$ and $Y = Z ^ { \\top } D _ { Y } Z$ be two random elements in the span of $z _ { i } z _ { i } ^ { \\top }$ , where $D _ { X }$ and $D _ { Y }$ are two random diagonal matrices. Both matrices $X$ and $Y$ can be diagonalized by matrix $Z$ . In this case, if we compute $X Y ^ { - 1 } = Z ^ { \\top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \\top } ) ^ { - 1 }$ , since $z _ { i }$ is a column of $Z ^ { \\dagger }$ , we know ", + "bbox": [ + 173, + 744, + 826, + 847 + ], + "page_idx": 6 + }, + { + "type": "equation", + "img_path": "images/3162aa3e218b2c6bc86c3aa482b53b3fd0ec766bc6fdbf8978ace572a4b8d71e.jpg", + "text": "$$\nX Y ^ { - 1 } z _ { i } = Z ^ { \\top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \\top } ) ^ { - 1 } z _ { i } = Z ^ { \\top } D _ { X } D _ { Y } ^ { - 1 } e _ { i } = \\frac { D _ { X } ( i , i ) } { D _ { Y } ( i , i ) } Z ^ { \\top } e _ { i } = \\frac { D _ { X } ( i , i ) } { D _ { Y } ( i , i ) } z _ { i } .\n$$", + "text_format": "latex", + "bbox": [ + 212, + 853, + 781, + 887 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "That is, $z _ { i }$ is an eigenvector of $X Y ^ { - 1 }$ ! The matrix $X Y ^ { - 1 }$ can have at most $k$ eigenvectors and there are $k z _ { i }$ ’s, therefore the $z _ { i }$ ’s are the only eigenvectors of $X Y ^ { - 1 }$ . ", + "bbox": [ + 171, + 893, + 821, + 924 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Lemma 5. Given the span of $z _ { i } z _ { i } ^ { \\top } \\mathbf { \\Sigma } ^ { \\prime } s ,$ , let $X , Y$ be two random matrices in this span, with probability 1 the $z _ { i }$ ’s are the only eigenvectors of $X Y ^ { - 1 }$ . ", + "bbox": [ + 173, + 102, + 823, + 132 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Using this procedure we can find all the $z _ { i }$ ’s (up to permutations and sign flip). Without loss of generality we assume $z _ { i } ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }$ . The only remaining problem is that $\\lambda _ { i }$ might be negative. However, this is easily fixable by checking $\\mathbb { E } [ z _ { i } ^ { \\top } y ] ~ = ~ \\lambda _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]$ . Since $\\sigma ( w _ { i } ^ { \\top } x )$ is always nonnegative, $\\mathbb { E } [ z _ { i } ^ { \\top } y ]$ has the same sign as $\\lambda _ { i }$ , and we can flip $z _ { i }$ if $\\mathbb { E } [ z _ { i } ^ { \\top } y ]$ is negative. ", + "bbox": [ + 174, + 146, + 825, + 205 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "3.3 DETAILED ALGORITHM AND GUARANTEES ", + "text_level": 1, + "bbox": [ + 174, + 227, + 514, + 242 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "We can now give the full algorithm, see Algorithm 2. The main steps of this algorithm is as explained in the previous section. Steps $2 \\cdot 5$ constructs the pure neuron detector and finds the span of $\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ (as in Corollary 1); Steps 7 - 9 performs simultaneous diagonalization to get all the $z _ { i }$ ’s; Steps 11, 12 calls Algorithm 1 to solve the single-layer problem and outputs the correct result. ", + "bbox": [ + 174, + 256, + 825, + 311 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Algorithm 2 Learning Two-layer Neural Networks ", + "text_level": 1, + "bbox": [ + 174, + 332, + 509, + 347 + ], + "page_idx": 7 + }, + { + "type": "table", + "img_path": "images/47f458cfbbd8f97c523797386fdd380ab04c8d6d78284f7eb1e55929d6ba10e7.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
Output: Weight matrices W_and A.Input: Samples (x1, y1),.,(xn, yn) generated according to Equation (4)
1: {Finding span of vec(zizT)’s}
2: Estimate empirical moments E[xxT],E[yxT],E[yx@3] and E[y y (x x)].
3: Compute the vector f(u) = 2E[(uTy).(E[(uTy)xT]E[xxT]-1x)·(xx)]-E[(uTy)²(x凶x)]
where each entry is expressed as a degree-2 polynomial over u.
4:: Construct matrix T ∈ Rd²×(k2+k) such that,Tvec*(uuT) = f(u).
5:Compute the k-least right singular vectors of T,denoted by vec*(U1), vec*(U2),.: , vec*(Uk). Let S be a k2 + k by k matrix, where the i-th column of S is vector vec*(Ui). {Here span S is
equal to span of {vec*(ziz𝑖)}.} 6:{Finding zi's from span}
7: Let X = mat*(SSi), Y = mat*(SS2), where S1 and S2 are two independently sampled k-
8:dimensional standard Gaussian vectors. :Let z1,.,zk be eigenvectors of XY-1.
9:For each zi,ifE[zTy] <O let zi ← -zi. {Here zi's are normalized rows of A-1.}
10:{Reduce to 1-Layer Problem}
11:For each zi,let Ui be the output of Algorithm 1 with input (x1,zi y1),., (xn, zi yn).
13:return V,Z-1.12: Let Z be the matrix whose rows are zT's, V be the matrix whose rows are vi 's.
", + "bbox": [ + 179, + 343, + 826, + 628 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "We are now ready to state a formal version of Theorem 1: ", + "bbox": [ + 173, + 648, + 552, + 664 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Theorem 4. Suppose $A , W , \\mathbb { E } [ x x ^ { \\top } ]$ and the distinguishing matrix $N$ are all full rank, and Algorithm 2 has access to the exact moments, then the network returned by the algorithm computes exactly the same function as the original neural network. ", + "bbox": [ + 174, + 670, + 825, + 712 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "It is easy to prove this theorem using the lemmas we have. ", + "bbox": [ + 173, + 727, + 555, + 741 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Proof. By Corollary 1, we know that after Step 5 of Algorithm 2, the span of columns of $S$ is exactly equal to the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ . By Lemma 5, we know the eigenvectors of $X Y ^ { - 1 }$ at Step 8 are exactly the normalized version of rows of $A ^ { - 1 }$ . Without loss of generality, we will fix the permutation and assume $z _ { i } ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }$ . In Step 9, we use the fact that $\\mathbb { E } [ \\breve { z } _ { i } ^ { \\top } y ] = \\bar { \\lambda } _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]$ where $\\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]$ is always positive because $\\sigma$ is the ReLU function. Therefore, after Step 9 we can assume all the $\\lambda _ { i }$ ’s are positive. ", + "bbox": [ + 173, + 772, + 825, + 858 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Now the output $z _ { i } ^ { \\top } y = \\lambda _ { i } \\sigma ( w _ { i } ^ { \\top } x ) = \\sigma ( \\lambda _ { i } w _ { i } ^ { \\top } x )$ (again by property of ReLU function $\\sigma$ ), by the design of Algorithm 1 we know $v _ { i } = \\lambda _ { i } w _ { i }$ . We also know that $\\dot { Z } = \\mathrm { d i a g } ( \\lambda ) A ^ { - 1 }$ , therefore $Z ^ { - 1 } = \\mathbf { \\bar { \\Phi } } _ { A \\mathrm { d i a g } ( \\bar { \\lambda } ) ^ { - 1 } }$ . Notice that $Z ^ { - 1 } \\sigma ( V x ) = { \\cal A } \\mathrm { d i a g } ( \\lambda ) ^ { - 1 } \\sigma ( \\mathrm { d i a g } ( \\lambda ) W x ) = { \\cal A } \\sigma ( W x )$ . These two scaling factors cancel each other, so the two networks compute the same function. □ ", + "bbox": [ + 174, + 863, + 823, + 921 + ], + "page_idx": 7 + }, + { + "type": "image", + "img_path": "images/bce1a966c2b20fa3aaf7fab0d0f73ff12c645bb513acc44d71dbecde7a947667.jpg", + "image_caption": [ + "Figure 2: Error in recovering $W$ , $A$ and outputs (“MSE”) for different numbers of training samples and different dimensions of $W$ and $A$ . Each point is the result of averaging across five trials, where on the left $W$ and $A$ are both drawn as random $1 0 \\times 1 0$ orthonormal matrices and in the center as $3 2 \\times 3 2$ orthonormal matrices. On the right, given 10, 000 training samples we plot the square root of the algorithm’s error normalized by the dimension of $W$ and $A$ , which are again drawn as random orthonormal matrices. The input distribution is a spherical Gaussian. " + ], + "image_footnote": [], + "bbox": [ + 183, + 113, + 803, + 210 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "4 EXPERIMENTS ", + "text_level": 1, + "bbox": [ + 176, + 334, + 326, + 349 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "In this section, we provide experimental results to validate the robustness of our algorithm for both Gaussian input distributions as well as more general symmetric distributions such as symmetric mixtures of Gaussians. ", + "bbox": [ + 176, + 367, + 823, + 409 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "There are two important ways in which our implementation differs from our description in Section 3.3. First, our description of the simultaneous diagonalization step in our algorithm is mostly for simplicity of both stating and proving the algorithm. In practice we find it is more robust to draw $1 0 k$ random samples from the subspace spanned by the last $k$ right-singular vectors of $T$ and compute the CP decomposition of all the samples (reshaped as matrices and stacked together as a tensor) via alternating least squares (Comon et al., 2009). As alternating least squares can also be unstable we repeat this step 10 times and select the best one. Second, once we have recovered and fixed $A$ we use gradient descent to learn $W$ , which compared to Algorithm 1 does a better job of ensuring the overall error will not explode even if there is significant error in recovering $A$ . Crucially, these modifications are not necessary when the number of samples is large enough. For example, given 10,000 input samples drawn from a spherical Gaussian and $A$ and $W$ drawn as random $1 0 \\times 1 0$ orthogonal matrices, our implementation of the original formulation of the algorithm was still able to recover both $A$ and $W$ with an average error of approximately 0.15 and achieve close to zero mean square error across 10 random trials. ", + "bbox": [ + 174, + 416, + 825, + 609 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "4.1 SAMPLE EFFICIENCY ", + "text_level": 1, + "bbox": [ + 176, + 628, + 361, + 642 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "First we show that our algorithm does not require a large number of samples when the matrices are not degenerate. In particular, we generate random orthonormal matrices $A$ and $W$ as the ground truth, and use our algorithm to learn the neural network. As illustrated by Figure 2, regardless of the size of $W$ and $A$ our algorithm is able to recover both weight matrices with minimal error so long as the number of samples is a few times of the number of parameters. To measure the error in recovering $A$ and $W$ , we first normalize the columns of $A$ and rows of $W$ for both our learned parameters and the ground truth, pair corresponding columns and rows together, and then compute the squared distance between learned and ground truth parameters. Note in the rightmost plot of Figure 2, in order to compare the performance between different dimensions, we further normalize the recovering error by the dimension of $W$ and $A$ . It shows that the squared root of normalized error remains stable as the dimension of $A$ and $W$ grows from 10 to 32. In Figure 2, we also show the overall mean square error–averaged over all output units–achieved by our learned parameters. ", + "bbox": [ + 174, + 655, + 825, + 821 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "4.2 ROBUSTNESS TO NOISE ", + "text_level": 1, + "bbox": [ + 176, + 840, + 379, + 856 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "Figure 3 demonstrates the robustness of our algorithm to label noise $\\xi$ for Gaussian and symmetric mixture of Gaussians input distributions. In this experiment, we fix the size of both $A$ and $W$ to be $1 0 \\times 1 0$ and again generate both parameters as random orthonormal matrices. The overall mean square error achieved by our algorithm grows almost perfectly in step with the amount of label noise, indicating that our algorithm recovers the globally optimal solution regardless of the choice of input distribution. ", + "bbox": [ + 174, + 867, + 823, + 924 + ], + "page_idx": 8 + }, + { + "type": "image", + "img_path": "images/cf79ccb6d55715961b9e37658eb5eab234c33717028790496de2c2959003240e.jpg", + "image_caption": [ + "Figure 3: Error in recovering $W$ , $A$ and outputs (“MSE”) for different amounts of label noise. Each point is the result of averaging across five trials with 10,000 training samples, where for each trial $W$ and $A$ are both drawn as $1 0 \\times 1 0$ orthonormal matrices. The input distribution on the left is a spherical Gaussian and on the right a mixture of two Gaussians with one component based at the all-ones vector and the other component at its reflection. " + ], + "image_footnote": [], + "bbox": [ + 187, + 117, + 735, + 248 + ], + "page_idx": 9 + }, + { + "type": "image", + "img_path": "images/43f46ddd59f652644244a5b20ed0b078d2f0b5e6c24659cfcd1904cadc331817.jpg", + "image_caption": [ + "Figure 4: Error in recovering $W$ , $A$ and outputs (“MSE”), on the left for different levels of conditioning of $W$ and on the right for $A$ . Each point is the result of averaging across five trials with 20,000 training samples, where for each trial one parameter is drawn as a random orthonormal matrix while the other as described in Section 4.3. The input distribution is a mixture of Gaussians with two components, one based at the all-ones vector and the other at its reflection. " + ], + "image_footnote": [], + "bbox": [ + 194, + 366, + 735, + 498 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 612, + 823, + 640 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "4.3 ROBUSTNESS TO CONDITION NUMBER ", + "text_level": 1, + "bbox": [ + 176, + 660, + 482, + 674 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "We’ve already shown that our algorithm continues to perform well across a range of input distributions and even when $A$ and $W$ are high-dimensional. In all previous experiments however, we sampled $A$ and $W$ as random orthonormal matrices so as to control for their conditioning. In this experiment, we take the input distribution to be a random symmetric mixture of two Gaussians and vary the condition number of either $A$ or $W$ by sampling singular value decompositions $U { \\boldsymbol { \\Sigma } } V ^ { \\top }$ such that $U$ and $V$ are random orthonormal matrices and $\\bar { \\Sigma _ { i i } } = \\mathbf { \\bar { \\Sigma } } ^ { - i }$ , where $\\lambda$ is chosen based on the desired condition number. Figure 4 respectively demonstrate that the performance of our algorithm remains steady so long as $A$ and $W$ are reasonably well-conditioned before eventually fluctuating. Moreover, even with these fluctuations the algorithm still recovers $A$ and $W$ with sufficient accuracy to keep the overall mean square error low. ", + "bbox": [ + 174, + 686, + 825, + 825 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "5 CONCLUSION ", + "text_level": 1, + "bbox": [ + 176, + 848, + 318, + 864 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "Optimizing the parameters of a neural network is a difficult problem, especially since the objective function depends on the input distribution which is often unknown and can be very complicated. In this paper, we design a new algorithm using method-of-moments and spectral techniques to avoid the complicated non-convex optimization for neural networks. Our algorithm can learn a network that is of similar complexity as the previous works, while allowing much more general input distributions. ", + "bbox": [ + 176, + 882, + 823, + 924 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 103, + 823, + 132 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "There are still many open problems. The current result requires output to have the same (or higher) dimension than the hidden layer, and the hidden layer does not have a bias term. Removing these constraints are are immediate directions for future work. Besides the obvious ones of extending our results to more general distributions and more complicated networks, we are also interested in the relations to optimization landscape for neural networks. In particular, our algorithm shows there is a way to find the global optimal network in polynomial time, does that imply anything about the optimization landscape of the standard objective functions for learning such a neural network, or does it imply there exists an alternative objective function that does not have any local minima? We hope this work can lead to new insights for optimizing a neural network. ", + "bbox": [ + 174, + 138, + 825, + 263 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "ACKNOWLEDGEMENT ", + "text_level": 1, + "bbox": [ + 176, + 285, + 356, + 300 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "This work was supported by NSF CCF-1704656. ", + "bbox": [ + 176, + 315, + 495, + 330 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "REFERENCES ", + "text_level": 1, + "bbox": [ + 176, + 103, + 285, + 117 + ], + "page_idx": 11 + }, + { + "type": "text", + "text": "Animashree Anandkumar, Rong Ge, Daniel Hsu, Sham M Kakade, and Matus Telgarsky. Tensor decompositions for learning latent variable models. The Journal of Machine Learning Research, 15(1):2773–2832, 2014. ", + "bbox": [ + 174, + 126, + 823, + 167 + ], + "page_idx": 11 + }, + { + "type": "text", + "text": "Sanjeev Arora, Aditya Bhaskara, Rong Ge, and Tengyu Ma. Provable bounds for learning some deep representations. 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", + "bbox": [ + 174, + 748, + 823, + 779 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "A DETAILS OF EXACT ANALYSIS ", + "text_level": 1, + "bbox": [ + 176, + 102, + 464, + 118 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "In this section, we first provide the missing proofs for the lemmas appeared in Section 3. Then we discuss how to handle the noise case (i.e. $\\overset { \\cdot } { \\boldsymbol { y } } = \\sigma ( W \\boldsymbol { x } ) + \\boldsymbol { \\xi } )$ and give the corresponding algorithm (Algorithm 3). At the end we also briefly discuss how to handle the case when the matrix $A$ has more rows than columns (more outputs than hidden units). ", + "bbox": [ + 174, + 132, + 825, + 189 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Again, throughout the section when we write $\\mathbb { E } [ \\cdot ]$ , the expectation is taken over the randomness of $x \\sim \\mathcal { D }$ and noise $\\xi$ . ", + "bbox": [ + 174, + 194, + 823, + 224 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "A.1 MISSING PROOFS FOR SECTION 3 ", + "text_level": 1, + "bbox": [ + 176, + 239, + 450, + 253 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Single-layer: To get rid of the non-linearities like ReLU, we use the property of the symmetric distribution (similar to (Goel et al., 2018)). Here we provide a more general version (Lemma 6) instead of proving the specific Lemma 1. Note that Lemma 1 is the special case when $a = w$ and $p = q = 1$ (here $\\xi$ does not affect the result since it has zero mean and is independent with $x$ , thus $\\mathbb { \\tilde { E } } [ y x ] = \\mathbb { E } [ \\sigma ( w ^ { \\top } x ) x ] )$ . ", + "bbox": [ + 173, + 271, + 825, + 342 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Lemma 6. Suppose input $x$ comes from a symmetric distribution, for any vector $a \\in \\mathbb { R } ^ { d }$ and any non-negative integers $p$ and $q$ satisfying that $p + q$ is an even number, we have ", + "bbox": [ + 171, + 344, + 823, + 372 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/752c6267837d1d801e50adf0e29663e9647bb1e4fa5a22cc59e514227b88b5db.jpg", + "text": "$$\n\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] ,\n$$", + "text_format": "latex", + "bbox": [ + 367, + 373, + 629, + 402 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "where the expectation is taken over the input distribution. ", + "bbox": [ + 174, + 404, + 547, + 417 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Proof. Since input $x$ comes from a symmetric distribution, we know that $\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] \\ =$ $\\mathbb { E } \\big [ \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } ( - x ) ^ { \\otimes q } \\big ]$ . Thus, we have ", + "bbox": [ + 173, + 433, + 825, + 467 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/7d8ac8d53eec1235c46da035ef9f5f729fe20f9b2423850be81c7ea7c507a7c6.jpg", + "text": "$$\n\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\Big ( \\mathbb { E } \\big [ \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } ( - x ) ^ { \\otimes q } \\big ] + \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] \\Big ) .\n$$", + "text_format": "latex", + "bbox": [ + 251, + 468, + 745, + 498 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "There are two cases to consider: $p$ and $q$ are both even numbers or both odd numbers. ", + "bbox": [ + 173, + 498, + 733, + 513 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "1. For the case where $p$ and $q$ are even numbers, we have ", + "bbox": [ + 212, + 527, + 589, + 542 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/afbc2dce8bc742eb89f691be27bff6a2c29e7056e8b0e80bd958e73a865a1b7c.jpg", + "text": "$$\n\\begin{array} { r l } & { \\quad \\frac { 1 } { 2 } \\bigl ( \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } ( - x ) ^ { \\otimes q } \\bigr ] + \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] \\bigr ) } \\\\ & { = \\frac { 1 } { 2 } \\bigl ( \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] + \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] \\bigr ) } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\Bigl [ \\Bigl ( \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } + \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } \\Bigr ) x ^ { \\otimes q } \\Bigr ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 348, + 544, + 702, + 632 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "If $( a ^ { \\top } x ) \\leq 0$ , we kno $\\operatorname { v } \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = ( a ^ { \\top } x ) ^ { p } + 0 = ( a ^ { \\top } x ) ^ { p } .$ Otherwise, we have $\\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = 0 + ( a ^ { \\top } x ) ^ { p } = ( a ^ { \\top } x ) ^ { p } .$ . Thus, ", + "bbox": [ + 232, + 633, + 825, + 669 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/ca255c49ec78741681812723872cec2fa83d46f7b8d09d339c60e472dcb4e38c.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\Big [ \\Big ( \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } + \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } \\Big ) x ^ { \\otimes q } \\Big ] } \\\\ & { \\qquad = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 318, + 671, + 736, + 732 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "2. For the other case where $p$ and $q$ are odd numbers, we have ", + "bbox": [ + 212, + 738, + 620, + 752 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/924b20cebd3789557f427c205951c2b05e05ddf0e1609ecf94360dc099403c98.jpg", + "text": "$$\n\\begin{array} { r l } & { \\quad \\frac { 1 } { 2 } \\bigl ( \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } ( - x ) ^ { \\otimes q } \\bigr ] + \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] \\bigr ) } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\Bigl [ \\Bigl ( - \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } + \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } \\Bigr ) x ^ { \\otimes q } \\Bigr ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 349, + 755, + 704, + 814 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Similarly, if $( a ^ { \\top } x ) \\leq 0$ , we know $- \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = - ( - a ^ { \\top } x ) ^ { p } + 0 =$ $( a ^ { \\top } x ) ^ { p }$ . Otherwise, we have $- \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = 0 + ( a ^ { \\top } x ) ^ { p } = ( a ^ { \\top } x ) ^ { p } .$ Thus, ", + "bbox": [ + 233, + 815, + 823, + 861 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/c84d12113ef89d8cc1becc5c696e78c14dba83b2ad3e557b72e251148d3ca846.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\Big [ \\Big ( - \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } + \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } \\Big ) x ^ { \\otimes q } \\Big ] } \\\\ & { \\qquad = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 308, + 862, + 745, + 924 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Pure neuron detector: The first step in our algorithm is to construct a pure neuron detector based on Lemma 2 and Lemma 3. We will provide proofs for these two lemmas here. ", + "bbox": [ + 169, + 138, + 823, + 169 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Proof of Lemma 2. This proof easily follows from Lemma 6. Setting $a = w$ , $p = 2$ and $q = 0$ in Lemma 6, we have $\\mathbb { E } [ \\hat { y } ^ { 2 } ] \\stackrel { \\cdot } { = } \\frac { 1 } { 2 } w ^ { \\top } \\mathbb { E } [ \\stackrel { \\cdot } { x } x ^ { \\top } ] w$ . Similarly, we also know $\\begin{array} { r } { \\mathbb E [ \\hat { y } x ^ { \\top } ] = \\frac 1 2 w ^ { \\top } \\mathbb E [ x x ^ { \\top } ] } \\end{array}$ and $\\begin{array} { r } { \\mathbb { E } [ \\hat { y } x ] = \\frac { 1 } { 2 } \\mathbb { E } [ x x ^ { \\top } ] w } \\end{array}$ . Thus, we have $\\mathbb { E } [ \\hat { y } ^ { 2 } ] = 2 \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { y } x ]$ . \u0003 ", + "bbox": [ + 173, + 176, + 826, + 223 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Proof of Lemma 3. Here, we only prove the second equation, since the first equation is just a special case of the second equation. First, we rewrite $\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) = u ^ { \\top } y } \\end{array}$ by letting $u ^ { \\top } A = c ^ { \\top }$ . Then we transform these two terms in the LHS as follows. Let’s look at $\\mathbb { E } [ ( u ^ { \\top } y ) \\cdot$ $( \\mathbb { E } [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } ^ { \\top } ] \\mathbb { E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } \\boldsymbol { x } ) \\cdot ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ]$ first. For $\\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 }$ , we have ", + "bbox": [ + 171, + 231, + 825, + 296 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/70c694d3de19bce55ee05c7fdd331870a14229b057702f06e677bd0100af1013.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\frac { 1 } { 2 } u ^ { \\top } A W \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\frac { 1 } { 2 } u ^ { \\top } A W } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 382, + 296, + 612, + 405 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "For any vector $q \\in \\mathbb { R } ^ { d }$ , consider $2 \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\cdot ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) \\cdot ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ]$ . We have ", + "bbox": [ + 173, + 410, + 645, + 428 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/272c1b5f402744448091ab5bcfb04b6537410159635aa834f4f83ae6e5deac34.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathrm { ~ \\gamma ~ } } \\\\ & { \\mathrm { ~ \\ } } \\\\ & { \\mathrm { = 2 \\mathbb E } [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } \\boldsymbol { \\sigma } ( \\boldsymbol { W } \\boldsymbol { x } ) ) ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) ] } \\\\ & { \\mathrm { ~ \\ } } \\\\ & { \\mathrm { = \\mathbb E } \\left[ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } \\boldsymbol { W } \\boldsymbol { x } ) ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\right] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 379, + 444, + 614, + 491 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Let $\\begin{array} { r } { { \\boldsymbol { q } } ^ { \\top } = \\mathbb { E } \\big [ ( { \\boldsymbol { u } } ^ { \\top } { \\boldsymbol { y } } ) { \\boldsymbol { x } } ^ { \\top } \\big ] \\mathbb { E } \\big [ { \\boldsymbol { x } } { \\boldsymbol { x } } ^ { \\top } \\big ] ^ { - 1 } = \\textstyle { \\frac { 1 } { 2 } } { \\boldsymbol { u } } ^ { \\top } { \\boldsymbol { A } } { \\boldsymbol { W } } } \\end{array}$ , we have ", + "bbox": [ + 171, + 498, + 545, + 518 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/bb885ab71860080ee69bb26ecf3cbf908f1eb4d199b2990c3d6d9dc8bb6fbee9.jpg", + "text": "$$\n\\begin{array} { r l } & { \\quad 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( u ^ { \\top } A W x ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = - \\frac { 1 } { 2 } \\mathbb { E } \\big [ \\langle A ^ { \\top } u , W x \\rangle ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u ) _ { i } ^ { 2 } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ) _ { i } ( A ^ { \\top } u ) _ { j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 184, + 522, + 808, + 681 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "where the second equality holds due to Lemma 6. ", + "bbox": [ + 174, + 694, + 500, + 709 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Now, let’s look at the second term $\\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]$ . ", + "bbox": [ + 173, + 714, + 531, + 732 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/101291ae3f1dfb35efea60fd71a64699c746c7f5141824822d740b69d4d3751e.jpg", + "text": "$$\n\\begin{array} { r l } & { ~ \\mathbb { E } [ ( u ^ { \\prime } , y ) ^ { 2 } ( x \\otimes x ) ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ \\langle A ^ { \\top } u , \\sigma ( W x ) \\rangle ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u ) _ { i } ^ { 2 } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ) _ { i } ( A ^ { \\top } u ) _ { j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 168, + 739, + 816, + 910 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Now, we subtract (5) by (6) to obtain ", + "bbox": [ + 173, + 103, + 418, + 118 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/7220bd01f0560530d7e36757673258014891855bb1aa2ff3d53f721f51a2c835.jpg", + "text": "$$\n\\begin{array} { r l r } { { 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } N _ { i j } N _ { i j } , } & { ( 8 } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 169, + 122, + 816, + 252 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "where (7) uses (9) of the following Lemma 7, and (8) uses the definition of distinguishing matrix $N$ (Definition 1). \u0003 ", + "bbox": [ + 173, + 258, + 820, + 287 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Lemma 7. Given input x coming from a symmetric distribution, for any vector $a , b \\in \\mathbb { R } ^ { d }$ , we have ", + "bbox": [ + 171, + 291, + 821, + 308 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/cf5f4de62a69923c5584948b049a03559595c1ceaf02291eea8a28687ac7b859.jpg", + "text": "$$\n\\frac { 1 } { 2 } \\mathbb { E } \\left[ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\right] - \\mathbb { E } \\left[ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\right] = \\frac { 1 } { 2 } \\mathbb { E } \\left[ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\right]\n$$", + "text_format": "latex", + "bbox": [ + 238, + 313, + 758, + 343 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "and ", + "bbox": [ + 173, + 349, + 202, + 363 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/d087eb37f212f68334f425345fcac5d6b60fc382512995b3f054080ea5c147c1.jpg", + "text": "$$\n\\mathbb E \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\mathbb E \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) ( x \\otimes x ) \\big ] = \\frac 1 2 \\mathbb E \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\big ] ,\n$$", + "text_format": "latex", + "bbox": [ + 181, + 366, + 825, + 397 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "where the expectation is taken over the input distribution. ", + "bbox": [ + 173, + 407, + 549, + 422 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Proof. Here we just prove the first identity, because the proof of the second one is almost identical. First, we rewrite ${ \\textstyle \\frac { 1 } { 2 } } \\mathbb { E } { \\bigl [ } ( a ^ { \\top } x ) ( b ^ { \\top } x ) { \\bigr ] }$ as follows ", + "bbox": [ + 173, + 436, + 823, + 467 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/fa2a2d7d181dd513f91a17b1ae262af487ecf911a24c0626c5c8c819ba79858b.jpg", + "text": "$$\n\\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\big ] + \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] .\n$$", + "text_format": "latex", + "bbox": [ + 183, + 473, + 813, + 505 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Thus, we only need to show that $\\begin{array} { r } { \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] } \\end{array}$ . It’s clear that $\\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] .$ ", + "bbox": [ + 174, + 508, + 825, + 556 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Since input $x$ comes from a symmetric distribution, we have ", + "bbox": [ + 171, + 559, + 571, + 573 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/8bfd7b604bb5a362c0850b8031d3cabab43f85b5379718751eb57a3ce4ebffb2.jpg", + "text": "$$\n\\begin{array} { r l } { \\boldsymbol { \\mathbb { z } } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] = \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } & { } \\\\ & { = \\frac { 1 } { 2 } \\Big ( \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } \\\\ & { \\quad \\quad + \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] \\Big ) } \\\\ & { = \\frac { 1 } { 2 } \\boldsymbol { \\mathbb { E } } \\Big [ \\big ( \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) + \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\big ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\Big ] } \\\\ & { = \\frac { 1 } { 2 } \\boldsymbol { \\mathbb { E } } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 577, + 839, + 719 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "When $a ^ { \\top } x b ^ { \\top } x > 0$ , we know $a ^ { \\top } x$ and $b ^ { \\top } x$ are both positive or both negative. In either case, we know that $\\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) + \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) = ( a ^ { \\top } x ) ( b ^ { \\top } x )$ . Thus, we have ", + "bbox": [ + 174, + 724, + 823, + 755 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/a3ad3f55cac3c8cc40f968085d9b5eb19aeeca3726679126538f0e7c6caff86b.jpg", + "text": "$$\n\\begin{array} { r } { \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } \\\\ { = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 303, + 760, + 691, + 814 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "which finished our proof. ", + "bbox": [ + 174, + 818, + 341, + 832 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Finding span: Now, we find the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ . First, we recall that $\\begin{array} { r } { f ( u ) = 2 \\mathbb { E } \\bigl [ ( u ^ { \\top } y ) } \\end{array}$ $( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]$ . Then, according to (8), we have ", + "bbox": [ + 173, + 852, + 812, + 887 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/5a2268a6caa0a299bc95a3aa40e6c70b5f0372e06de1bbace7c98e01392a2ca5.jpg", + "text": "$$\n\\mathbf { \\Psi } ^ { * } ( u ) = 2 \\mathbb { E } \\left[ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } \\left[ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\right] = \\sum _ { \\substack { 1 \\leq i < j \\leq k } } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } N _ { i }\n$$", + "text_format": "latex", + "bbox": [ + 181, + 892, + 839, + 929 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "It is not hard to verify that $u ^ { \\top } y$ is a pure neuron if and only if $f ( u ) = 0$ . Note that $f ( u ) = 0$ is a system of quadratic equations. So we linearize it by increasing the dimension (i.e., consider $u _ { i } u _ { j }$ as a single variable) similar to the FOOBI algorithm. Thus the number of variable is $\\textstyle { \\binom { k } { 2 } } + k = k _ { 2 } + k _ { \\ O }$ , i.e., ", + "bbox": [ + 173, + 102, + 825, + 160 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/65e669e1a93247b713bf3461d076fc815189065fce1e9d3d361eb4b98ef0eb36.jpg", + "text": "$$\n\\exists T \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) } \\mathrm { ~ s u c h ~ t h a t ~ } T \\mathrm { v e c } ^ { * } ( U ) = f ( U ) = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } U A ) _ { i j } N _ { i j } .\n$$", + "text_format": "latex", + "bbox": [ + 250, + 159, + 746, + 195 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Now, we prove the Lemma 4 which shows the null space of $T$ is exactly the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ . ", + "bbox": [ + 176, + 198, + 820, + 214 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Proof of Lemma 4. We divide the proof to the following two cases: ", + "bbox": [ + 173, + 223, + 620, + 239 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "1. For any vector vec $^ * ( U )$ belongs to the null space of $T$ , we have $T \\mathrm { v e c } ^ { * } ( U ) = 0$ . Note that the RHS of (10) equals to 0 if and only if $A ^ { \\top } { \\bar { U } } A$ is a diagonal matrix since the distinguishing matrix $N$ is full column rank and $A ^ { \\top } U A$ is symmetric. Thus ${ \\mathrm { v e c } } ^ { * } ( U )$ belongs to the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ since $U = Z ^ { \\top } D Z$ for some diagonal matrix $D$ . ", + "bbox": [ + 214, + 250, + 825, + 306 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "2. For any vector ${ \\mathrm { v e c } } ^ { * } ( U )$ belonging to the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ , $U$ is a linear combination of $z _ { i } z _ { i } ^ { \\dagger }$ ’s. Furthermore, $T \\mathrm { v e c } ^ { * } ( U )$ is a linear combination of $\\tilde { T } \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ . Note that $A ^ { \\top } z _ { i }$ only has one non-zero entry due to the definition of $z _ { i }$ , for any $i \\in [ k ]$ . Thus all coefficients in the RHS of (10) are 0. We get $T \\mathrm { v e c } ^ { * } ( U ) = 0$ . ", + "bbox": [ + 214, + 310, + 823, + 369 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Finding $z _ { i }$ ’s: Now, we prove the final Lemma 5 which finds all $z _ { i }$ ’s from the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ by using simultaneous diagonalization. Given all $z _ { i }$ ’s, this two-layer network can be reduced to a single-layer one. Then one can use Algorithm 1 to recover the first layer parameters $w _ { i }$ ’s. ", + "bbox": [ + 174, + 407, + 825, + 452 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Proof of Lemma 5. As we discussed before this lemma, we have $X Y ^ { - 1 } = Z ^ { \\top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \\top } ) ^ { - 1 }$ . According to the following Lemma 8 (i.e., all diagonal elements of $D _ { x } D _ { y } ^ { - 1 }$ are non-zero and distinct), the matrix $X Y ^ { - 1 }$ have $k$ eigenvectors and there are $k z _ { i }$ ’s, therefore $z _ { i }$ ’s are the only eigenvectors of $X Y ^ { - 1 }$ . \u0003 ", + "bbox": [ + 174, + 460, + 825, + 521 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Lemma 8. With probability 1, all diagonal elements of $D _ { X }$ and $D _ { Y }$ are non-zero and all diagonal elements of $D _ { X } \\dot { D } _ { Y } ^ { - 1 }$ are distinct, where $X = Z ^ { \\top } D _ { X } \\bar { Z }$ and $Y = Z ^ { \\top } D _ { Y } Z$ are defined in Line 7 of Algorithm 2. ", + "bbox": [ + 173, + 525, + 825, + 568 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Proof. First, we know there exist diagonal matrices $\\{ D _ { i } : i \\in [ k ] \\}$ such that m $\\mathsf { a t } ^ { * } ( \\mathsf { v e c } ^ { * } ( U _ { i } ) ) =$ $Z ^ { \\top } \\dot { D } _ { i } Z$ for all $i \\in [ k ]$ , where $\\{ \\mathrm { v e c } ^ { * } ( U _ { i } ) : i \\in [ k ] \\}$ are the $k$ -least right singular vectors of $T$ (see Line 5 of Algorithm 2). Then, let the vector $\\bar { d } _ { i } \\in \\mathbb { R } ^ { k }$ be the diagonal elements of $D _ { i }$ , for all $i \\in k$ . Let matrix $Q \\in \\mathbb { R } ^ { k \\times k }$ be a matrix where its $i$ -th column is $d _ { i }$ . Then $D _ { X } = \\mathrm { d i a g } ( Q \\zeta _ { 1 } ) $ and $D _ { Y } = \\mathrm { d i a g } ( Q \\zeta _ { 2 } )$ , where $\\zeta _ { 1 }$ and $\\zeta _ { 2 }$ are two random $k$ -dimensional standard Gaussian vectors (see Line 7 of Algorithm 2). ", + "bbox": [ + 173, + 582, + 825, + 667 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Since $\\{ \\mathrm { v e c } ^ { * } ( U _ { i } ) : i \\in [ k ] \\}$ are singular vectors of $T$ , we know $d _ { 1 } , d _ { 2 } , \\cdots , d _ { k }$ are independent. Thus, $Q$ has full rank and none of its rows are zero vectors. Let $i$ -th row of $Q$ be $q _ { i } ^ { \\top }$ . Let’s consider $D _ { X }$ first. In order for $i$ -th diagonal element of $D _ { X }$ to be zero, we need $q _ { i } ^ { \\top } \\zeta _ { 1 } = 0$ . Since $q _ { i }$ is not a zero vector, we know the solution space of $q _ { i } \\zeta _ { 1 } = 0$ is a lower-dimension manifold in $\\mathbb { R } ^ { k }$ , which has zero measure. Since finite union of zero-measure sets still has measure zero, the event that zero valued elements exist in the diagonal of $D _ { X }$ or $D _ { Y }$ happens with probability zero. ", + "bbox": [ + 173, + 672, + 825, + 761 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "If $i$ -th and $j$ -th diagonal elements of $D _ { X } D _ { Y } ^ { - 1 }$ have same value, we have $q _ { i } ^ { \\top } \\zeta _ { 1 } ( q _ { i } ^ { \\top } \\zeta _ { 2 } ) ^ { - 1 } \\ =$ $q _ { j } ^ { \\top } \\zeta _ { 1 } ( q _ { j } ^ { \\top } \\zeta _ { 2 } ) ^ { - 1 }$ . Again, we know the solution space is a lower-dimensional manifold in $\\mathbb { R } ^ { 2 k }$ space, with measure zero. Since finite union of zero-measure sets still has measure zero, the event that duplicated diagonal elements exist in $D _ { X } D _ { Y } ^ { - 1 }$ happens with probability zero. □ ", + "bbox": [ + 173, + 766, + 825, + 825 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "A.2 NOISY CASE ", + "text_level": 1, + "bbox": [ + 176, + 842, + 308, + 856 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Now, we discuss how to handle the noisy case (i.e. $y = \\sigma ( W x ) + \\xi )$ . The corresponding algorithm is described in Algorithm 3. Note that the noise $\\xi$ only affects the first two steps, i.e., pure neuron detector (Lemma 3) and finding span of vec ${ \\mathrm { ; } } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ (Lemma 4). It does not affect the last two steps, i.e., finding $z _ { i }$ ’s from the span (Lemma 5) and learning the reduced single-layer network. Because ", + "bbox": [ + 174, + 867, + 825, + 924 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Algorithm 3 Learning Two-layer Neural Networks with Noise ", + "text_level": 1, + "bbox": [ + 173, + 103, + 584, + 117 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Input: Samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ generated according to Equation (2) \nOutput: Weight matrices $W$ and $A$ . 1: {Finding span of $\\nu e c ^ { * } \\big ( z _ { i } z _ { i } ^ { \\top } \\big ) \\big \\}$ \n2: Use first half of samples (i.e. $\\{ ( x _ { i } , y _ { i } ) \\} _ { i = 1 } ^ { n / 2 } )$ to estimate empirical moments $\\hat { \\mathbb { E } } [ x x ^ { \\top } ] , \\hat { \\mathbb { E } } [ y x ^ { \\top } ]$ , $\\hat { \\mathbb { E } } [ y y ^ { \\top } ] , \\hat { \\mathbb { E } } [ y \\otimes x ^ { \\otimes 3 } ]$ and $\\hat { \\mathbb { E } } [ y \\otimes y \\otimes ( x \\otimes x ) ]$ . \n3: Compute the vector $\\begin{array} { r } { f ( u ) = 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) \\cdot ( \\hat { \\mathbb { E } } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes 2 \\hat { \\mathbb { E } } [ ( u ^ { \\top } x ) ^ { \\top } ] - 2 \\hat { \\mathbb { E } } [ ( u ^ { \\top } y ) ^ { 2 } ] ) ^ { \\top } \\big ] } \\end{array}$ $\\boldsymbol { x } ) ] + \\Big ( \\hat { \\mathbb { E } } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) ^ { 2 } \\big ] - 2 \\hat { \\mathbb { E } } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } \\big ] \\Big ) \\hat { \\mathbb { E } } [ \\boldsymbol { x } \\otimes \\boldsymbol { x } ]$ where each entry is expressed as a degree-2 polynomial over $u$ . \n4: Construct matrix $T \\in \\overline { { \\mathbb { R } ^ { d ^ { 2 } } } } \\times ( k _ { 2 } + k )$ such that, $T \\mathrm { v e c } ^ { * } ( u u ^ { \\top } ) = f ( u )$ . \n5: Compute the $k$ -least right singular vectors of $T$ , denoted by v $\\mathsf { e c } ^ { * } ( U _ { 1 } ) , \\mathsf { v e c } ^ { * } ( U _ { 2 } ) , \\cdot \\cdot \\cdot , \\mathsf { v e c } ^ { * } ( U _ { k } )$ . Let $S$ be a $k _ { 2 } + k$ by $k$ matrix, where the $i$ -th column of $S$ is vector vec $^ { * } ( U _ { i } )$ . $\\{$ {Here span $S$ is equal to span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\} . \\}$ 6: {Finding $z _ { i }$ ’s from span} \n7: Let $X = \\mathrm { m a t } ^ { * } ( S \\zeta _ { 1 } )$ , $\\dot { Y } = \\operatorname* { m a t } ^ { * } ( S \\zeta _ { 2 } )$ , where $\\zeta _ { 1 }$ and $\\zeta _ { 2 }$ are two independently sampled $k$ - dimensional standard Gaussian vectors. \n8: Let $z _ { 1 } , . . . , z _ { k }$ be eigenvectors of $X Y ^ { - 1 }$ . \n9: For each $z _ { i }$ , use the second half of samples $\\{ ( x _ { i } , y _ { i } ) \\} _ { i = n / 2 + 1 } ^ { n }$ to estimate $\\hat { \\mathbb { E } } [ z _ { i } ^ { \\top } y ]$ . If $\\hat { \\mathbb { E } } [ z _ { i } ^ { \\top } y ] < 0$ let $z _ { i } \\gets - z _ { i }$ . {Here $z _ { i }$ ’s are normalized rows of $A ^ { - 1 }$ .} \n10: {Reduce11: For each , $I$ -Let er Problem}be the output of Algorithm 1 with input . $z _ { i }$ $v _ { i }$ $\\{ ( x _ { j } , z _ { i } ^ { \\top } y _ { j } ) \\} _ { j = n / 2 + 1 } ^ { n }$ \n12: Let $Z$ be the matrix whose rows are $z _ { i } ^ { \\top }$ ’s, $V$ be the matrix whose rows are $v _ { i } ^ { \\top }$ ’s. \n13: return $V , Z ^ { - 1 }$ . ", + "bbox": [ + 176, + 121, + 826, + 459 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Lemma 5 is independent of the model and Lemma 1 is linear wrt. noise $\\xi$ , which has zero mean and is independent of input $x$ . ", + "bbox": [ + 174, + 489, + 823, + 518 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Many of the steps in Algorithm 3 are designed with the robustness of the algorithm in mind. For example, in step 5 for the exact case we just need to compute the null space of $T$ . However if we use the empirical moments the null space might be perturbed so that it has small singular values. The separation of the input samples into two halves is also to avoid correlations between the steps, and is not necessary if we have the exact moments. ", + "bbox": [ + 173, + 525, + 825, + 595 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Modification for pure neuron detector: Recall that in the noiseless case, our pure neuron detector contains a term $\\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) ]$ , which causes a noise square term in the noisy case. Here, we modify our pure neuron detector to cancel the extra noise square term. In the following lemma, we state our modified pure neuron detector in Equation 11, and give it a characterization. ", + "bbox": [ + 174, + 608, + 825, + 665 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Lemma 9. Suppose $y = A \\sigma ( W x ) + \\xi ,$ for any $u \\in \\mathbb { R } ^ { k }$ , we have ", + "bbox": [ + 173, + 667, + 602, + 684 + ], + "page_idx": 17 + }, + { + "type": "equation", + "img_path": "images/df3c43a141a28683c445d879e7b7f608ec440df23cca60eabc257c4f895cb833.jpg", + "text": "$$\n\\begin{array} { r l r } { { f ( \\boldsymbol { u } ) : = 2 \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\cdot \\big ( \\mathbb { E } [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } ^ { \\top } ] \\mathbb { E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } \\boldsymbol { x } \\big ) \\cdot \\big ( \\boldsymbol { x } \\otimes \\boldsymbol { x } \\big ) \\big ] - \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) ^ { 2 } ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ] } } \\\\ & { } & { + ( \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) ^ { 2 } \\big ] - 2 \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } ^ { \\top } \\big ] \\mathbb { E } \\big [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } \\big ] ) \\mathbb { E } [ \\boldsymbol { x } \\otimes \\boldsymbol { x } ] } \\\\ & { } & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( \\boldsymbol { A } ^ { \\top } \\boldsymbol { u } \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } ) _ { i j } N _ { i j } - \\Big ( \\sum _ { 1 \\leq i < j \\leq k } ( \\boldsymbol { A } ^ { \\top } \\boldsymbol { u } \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } ) _ { i j } m _ { i j } \\Big ) \\mathbb { E } [ \\boldsymbol { x } \\otimes \\boldsymbol { x } ] , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 230, + 690, + 766, + 777 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "where $N _ { i j } \\ ' _ { s }$ are columns of the distinguishing matrix (Definition $^ { l }$ ), and $\\begin{array} { r l } { m _ { i j } } & { { } : = } \\end{array}$ $\\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( \\bar { w } _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ]$ . ", + "bbox": [ + 173, + 784, + 823, + 816 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "We defer the proof of this lemma to the end of this section. Recall that the augmented distinguishing matrix $M$ consists of the distinguishing matrix $N$ plus column $\\mathbb { E } [ x \\otimes x ]$ . Now, we need to assume the augmented distinguishing matrix $M$ is full rank. ", + "bbox": [ + 174, + 825, + 825, + 869 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Modification for finding span: For Lemma 4, as we discussed above, here we assume the augmented distinguishing matrix $M$ is full rank. The corresponding lemma is stated as follows (the proof is exactly the same as previous Lemma 4): ", + "bbox": [ + 174, + 881, + 823, + 924 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Lemma 10. Let $T$ be the unique $\\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }$ matrix that satisfies $T \\nu e c ^ { * } ( u u ^ { \\top } ) = f ( u )$ (defined in Equation $1 l$ ), suppose the augmented distinguishing matrix is full rank, then the nullspace of $T$ is exactly the span of $\\{ \\nu e c ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}$ . ", + "bbox": [ + 173, + 101, + 825, + 147 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Similar to Theorem 4, we provide the following theorem for the noisy case. The proof is almost the same as Theorem 4 by using the noisy version lemmas (Lemmas 9 and 10). ", + "bbox": [ + 174, + 161, + 823, + 190 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Theorem 5. Suppose $\\mathbb { E } [ x x ^ { \\top } ] , A , W$ and the augmented distinguishing matrix $M$ are all full rank, and Algorithm 3 has access to the exact moments, then the network returned by the algorithm computes exactly the same function as the original neural network. ", + "bbox": [ + 174, + 195, + 825, + 239 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Now, we only need to prove Lemma 9 to finish this noise case. ", + "bbox": [ + 173, + 253, + 584, + 270 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Proof of Lemma 9. Similar to (5) and (6), we deduce these three terms in RHS of (11) one by one as follows. For the first term, it is exactly the same as (5) since the expectation is linear wrt. $\\xi$ . Thus, we have ", + "bbox": [ + 173, + 282, + 825, + 325 + ], + "page_idx": 18 + }, + { + "type": "equation", + "img_path": "images/616e7caa9ab5ce6b7a92a319b290cc41177862d6d5a1b5a70ea78356354707f9.jpg", + "text": "$$\n\\begin{array} { r l } & { \\ 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 186, + 335, + 810, + 398 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Now, let’s look at the second term $\\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]$ which is slightly different from (6) due to the noise $\\xi$ . Particularly, we add the third term to cancel this extra noise square term later. ", + "bbox": [ + 173, + 433, + 825, + 464 + ], + "page_idx": 18 + }, + { + "type": "equation", + "img_path": "images/39442405ba6e04f091d79beaba8ccf54706237c6151f23829305430730d2ee26.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } ( A \\sigma ( W x ) + \\xi ) ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) ^ { 2 } ( x \\otimes x ) \\big ] + \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 171, + 474, + 816, + 579 + ], + "page_idx": 18 + }, + { + "type": "equation", + "img_path": "images/d01a73e8a1194fd78c4845f53e552f35adca743a4d4e54b3d3c7effeea5bd42e.jpg", + "text": "$$\n+ \\mathbb { E } \\left[ ( u ^ { \\top } \\xi ) ^ { 2 } ( x \\otimes x ) \\right] ,\n$$", + "text_format": "latex", + "bbox": [ + 191, + 593, + 338, + 614 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "where (15) uses (6). ", + "bbox": [ + 174, + 626, + 307, + 641 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "For the third term, we have ", + "bbox": [ + 173, + 647, + 354, + 662 + ], + "page_idx": 18 + }, + { + "type": "equation", + "img_path": "images/40c7ff7f9d89e584e1979504b68c4781bde7d8ccf57295860e47962673dfaec2.jpg", + "text": "$$\n\\begin{array} { r l r } { { \\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ] - 2 \\mathbb { E } [ ( u ^ { \\top } y ) u ^ { \\top } ] \\mathbb { E } [ x ^ { \\top \\cdot \\tau } ] ^ { - 1 } \\mathbb { E } [ ( u ^ { \\top } y ) x ] } } \\\\ & { } & { = \\mathbb { E } [ ( u ^ { \\top } \\mathcal { A } \\sigma ( W x ) ) ^ { 2 } ] + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] - \\frac { 1 } { 2 } \\mathbb { E } [ \\langle \\mathcal { A } ^ { \\top } , u , W x \\rangle ^ { 2 } ] } \\\\ & { = \\sum _ { 1 \\leq i \\leq i } A ^ { \\top } u u ^ { \\top } A \\rangle _ { 3 \\mathbb { E } } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ^ { 2 } ] - \\frac { 1 } { 2 } \\sum _ { 1 \\leq i \\leq i } A ^ { \\top } u ^ { \\top } A \\rangle \\mathbb { E } [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ] } \\\\ & { } & { \\overset { \\mathrm { ( 4 ) } } { = } + \\sum _ { 1 \\leq i \\leq i } \\sum _ { 1 \\leq i } ( A ^ { \\top } u w _ { i } ^ { \\top } A ) _ { i \\beta } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) z ( w _ { i } ^ { \\top } x ) ] - \\sum _ { 1 \\leq i \\leq i } ( A ^ { \\top } u u ^ { \\top } A ) _ { i \\beta } \\mathbb { E } [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ] } \\\\ & { } & { + \\frac { 1 } { 1 \\leq i \\leq i \\leq j \\leq k } } \\\\ & { } & { = + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] } \\\\ & { = - \\sum _ { 1 \\leq i \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { B } [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ] \\{ ( w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 ) \\} + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] } \\\\ & { = - \\sum _ { 1 \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } m _ { i i } + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] , } \\\\ & = - \\sum _ { 1 \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 176, + 671, + 815, + 897 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "where the third equality holds due to Lemma 6 and Lemma 7, and (16) uses the definition of $m _ { i j }$ ", + "bbox": [ + 169, + 909, + 810, + 925 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Algorithm 4 Learning Two-layer Neural Networks with Non-square $A$ ", + "text_level": 1, + "bbox": [ + 174, + 103, + 640, + 117 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Input: Samples $( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )$ generated according to Equation (2). \nOutput: Weight matrices $W \\in \\mathbb { R } ^ { k \\times d }$ and $A \\in ^ { l \\times k }$ . \n1: Using half samples (i.e. $\\{ ( x _ { i } , y _ { i } ) \\} _ { i = 1 } ^ { n / 2 } )$ to estimate empirical moments $\\hat { \\mathbb { E } } [ y x ^ { \\top } ]$ . \n2: Let $P$ be a $l \\times k$ matrix, which columns are left singular vectors of $\\hat { \\mathbb { E } } [ y x ^ { \\top } ]$ . \n3: Run Algorithm 3 on samples $\\{ ( x _ { i } , P ^ { \\top } y _ { i } ) \\} _ { i = n / 2 } ^ { n } .$ . Let the output of Algorithm 3 be $V , Z ^ { - 1 }$ . \n4: return $V , P Z ^ { - 1 }$ . ", + "bbox": [ + 178, + 119, + 803, + 217 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Finally, we combine these three terms (13–16) as follows: ", + "bbox": [ + 173, + 244, + 553, + 260 + ], + "page_idx": 19 + }, + { + "type": "equation", + "img_path": "images/a292281720bf57475cb114825d5b5987e1c25fbd63f5a804048cf28cd71bf2f6.jpg", + "text": "$$\n\\begin{array} { r l } & { f ( u ) = 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { \\qquad + \\left( \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ \\mathbb { x } x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\right) \\mathbb { E } [ x \\otimes x ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } \\big ( A ^ { \\top } u u ^ { \\top } A _ { j \\downarrow } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { \\qquad - 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A _ { j \\downarrow } ) \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } \\big ] \\mathbb { E } \\big [ x \\otimes x \\big ] } \\\\ & { \\qquad + \\left( - \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { j j } m _ { s j } + \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } \\big ] \\right) \\mathbb { E } \\big [ x \\otimes x \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { j j } N _ { i j } - \\Big ( \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ^ { \\top } A ) _ { i j } m _ { i j } \\Big ) \\mathbb { E } [ x \\otimes x ] , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 184, + 265, + 807, + 463 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "where (17) uses (9) (same as (7)). ", + "bbox": [ + 174, + 469, + 397, + 483 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "A.3 EXTENSION TO NON-SQUARE $A$ ", + "text_level": 1, + "bbox": [ + 176, + 501, + 439, + 515 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "In this paper, for simplicity, we have assumed that the dimension of output equals the number of hidden units and thus $A$ is a $k \\times k$ square matrix. Actually, our algorithm can be easily extended to the case where the dimension of output is at least the number of hidden units. In this section, we give an algorithm for this general case, by reducing it to the case where $A$ is square. The pseudo-code is given in Algorithm 4. ", + "bbox": [ + 173, + 526, + 825, + 597 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Theorem 6. Suppose $\\mathbb { E } [ x x ^ { \\top } ] , W , A$ and the augmented distinguishing matrix $M$ are all full rank, and Algorithm $^ { 4 }$ has access to the exact moments, then the network returned by the algorithm computes exactly the same function as the original neural network. ", + "bbox": [ + 173, + 599, + 825, + 643 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Proof. Let the ground truth parameters be $A \\in \\mathbb { R } ^ { l \\times k }$ and $W \\in \\mathbb { R } ^ { k \\times d }$ . The samples are generated by $y = A \\sigma ( W x ) + \\xi$ , where the noise $\\xi$ is independent with input $x$ . We have $\\begin{array} { r } { \\mathbb E [ y \\dot { { x } } ^ { \\top } ] = \\frac 1 2 \\mathbf { \\bar { A } } W \\mathbb E [ { { x } } { { x } } ^ { \\top } ] } \\end{array}$ . Since both $W$ and $\\mathbb { E } [ x x ^ { \\top } ]$ are full-rank, we know the column span of $\\mathbb { E } [ y x ^ { \\top } ]$ are exactly the column span of $A$ . Furthermore, we know the columns of $P$ is a set of orthonormal basis for the column span of $A$ . ", + "bbox": [ + 173, + 659, + 825, + 733 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "For a ground truth neural network with weight matrices $W$ and $P ^ { \\top } A$ , the generated sample will just be $( x , P ^ { \\top } y )$ . According to Theorem 5, we know for any input $x$ , we have $Z ^ { - 1 } \\sigma ( { \\bar { V } } x ) =$ $\\mathbf { \\dot { \\nabla } } P ^ { \\top } A \\sigma ( \\dot { W } x )$ . Thus, we have ", + "bbox": [ + 173, + 738, + 825, + 781 + ], + "page_idx": 19 + }, + { + "type": "equation", + "img_path": "images/09abfb133cd55214e4eb5ec9e904786820482ab562684042e4712b63da011a3e.jpg", + "text": "$$\nP Z ^ { - 1 } \\sigma ( V x ) = P P ^ { \\top } A \\sigma ( W x ) = A \\sigma ( W x ) ,\n$$", + "text_format": "latex", + "bbox": [ + 349, + 787, + 647, + 808 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "where the second equality holds since $P P ^ { \\top }$ is just the projection matrix to the column span of $A$ . □ ", + "bbox": [ + 168, + 813, + 823, + 843 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "B ROBUSTNESS OF MAIN ALGORITHM ", + "text_level": 1, + "bbox": [ + 174, + 863, + 513, + 881 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "In this section we will show that even if we do not have access to the exact moments, as long as the empirical moments are estimated with enough (polynomially many) samples, Algorithm 2 and ", + "bbox": [ + 173, + 895, + 825, + 924 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Algorithm 3 can still learn the parameters robustly. We will focus on Algorithm 3 as it is more general, the result for Algorithm 2 can be viewed as a corollary when the noise $\\xi = 0$ . Throughout this section, we will use $\\bar { \\boldsymbol { V } } , \\hat { \\boldsymbol { Z } } ^ { - 1 }$ to denote the results of Algorithm 3 with empirical moments, and use $V , Z ^ { - 1 }$ for the results when the algorithm has access to exact moments, similarly for other intermediate results. For the robustness of Algorithm 3, we prove the following theorem. ", + "bbox": [ + 173, + 102, + 825, + 176 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Theorem 7. Assume that the norms of $x , \\xi , A$ are bounded by $\\| x \\| \\leq \\Gamma , \\| \\xi \\| \\leq P _ { 2 } , \\| A \\| \\leq P _ { 1 } ,$ , the covariance matrix and the weight matrix are robustly full rank: $\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta$ . Further assume that the augmented distinguishing matrix has smallest singular values $\\sigma _ { \\mathrm { m i n } } ( M ) \\geq$ $\\alpha$ . For any small enough \u000f, for any $\\delta < 1$ , given poly $\\left( \\Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \\epsilon , 1 / \\gamma , 1 / \\alpha , 1 / \\beta , 1 / \\delta \\right)$ number of i.i.d. samples, let the output of Algorithm 3 be $\\hat { V } , \\hat { Z } ^ { - 1 }$ , we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 179, + 825, + 256 + ], + "page_idx": 20 + }, + { + "type": "equation", + "img_path": "images/bb6326c2231dac68813e7ef1a4d439b5b2dfd4fc41b4f99251db7488f7f3dcc8.jpg", + "text": "$$\n\\| A \\sigma ( W x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\| \\le \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 393, + 261, + 602, + 280 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "for any input $x$ ", + "bbox": [ + 173, + 287, + 276, + 301 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "In order to prove the above Theorem, we need to show that each step of Algorithm 3 is robust. We can divide Algorithm 3 into three steps: finding the span of $\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) ^ { \\cdot }$ ’s; finding $z _ { i }$ ’s from the span of $\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ ’s; recovering first layer using Algorithm 1. We will first state the key lemmas that prove every step is robust to noise, and finally combine them to show our main theorem. ", + "bbox": [ + 173, + 313, + 825, + 371 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "First, we show that with polynomial number of samples, we can approximate the span of $\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ ’s in arbitrary accuracy. Let $\\hat { T }$ be the empirical estimate of $T$ , which is the pure neuron detector matrix as defined in Algorithm 3. As shown in Lemma 10, the null space of $T$ is exactly the span of $\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ ’s. We use standard matrix perturbation theory (see Section D.2) to show that the null space of $T$ is robust to small perturbations. More precisely, in Lemma 11, we show that with polynomial number of samples, the span of $k$ least singular vectors of $\\hat { T }$ is close to the null space of $T$ . ", + "bbox": [ + 173, + 377, + 825, + 479 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Lemma 11. Under the same assumptions as in Theorem 7, let $S \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }$ be the matrix whose $k$ columns are the $k$ least right singular vectors of $T$ . Similarly define √ $\\hat { S } \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }$ for empirical estimate $\\hat { T } .$ . Then for any $\\epsilon \\leq \\gamma / 2 ,$ , for any $\\delta < 1$ , given $\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } . } \\end{array}$ ) number of i.i.d. samples, we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 483, + 825, + 551 + ], + "page_idx": 20 + }, + { + "type": "equation", + "img_path": "images/49c1e43446cfaa1659dc197db3d59ca3da99857ec357ab0642e8b2723ef52cd9.jpg", + "text": "$$\n\\lVert S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\rVert \\leq \\frac { \\sqrt { 2 } \\epsilon } { \\alpha \\beta ^ { 2 } } .\n$$", + "text_format": "latex", + "bbox": [ + 416, + 556, + 581, + 592 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "The proof of the above lemma is in Section B.1. Basically, we need to lowerbound the spectral gap ( $k _ { 2 }$ -th singular value of $T$ ) and to upperbound the Frobenius norm of $T - { \\hat { T } }$ . Standard matrix perturbation bound shows that if the perturbation is much smaller than the spectral gap, then the null space is preserved. ", + "bbox": [ + 173, + 604, + 825, + 662 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Next, we show that we can robustly find $z _ { i }$ ’s from the span of $\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )$ ’s. Since this step of the algorithm is the same as the simultaneous diagonalization algorithm for tensor decompositions, we use the robustness of simultaneous diagonalization (Bhaskara et al., 2014) to show that we can find $z _ { i }$ ’s robustly. The detailed proof is in Section B.2. ", + "bbox": [ + 173, + 669, + 825, + 726 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Lemma 12. Suppose that $\\begin{array} { r c l } { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } & { \\leq } & { \\epsilon , \\| A \\| } \\\\ & { } & { \\geq } \\end{array} \\leq \\epsilon , \\| A \\| \\ \\leq \\ { P } _ { 1 } , \\| \\xi \\| \\ \\leq \\ P _ { 2 } , \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\ \\geq$ $\\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta$ . Let $\\hat { X } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 1 } ) , \\hat { Y } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 2 } )$ , where $\\zeta _ { 1 }$ and $\\zeta _ { 2 }$ are two independent standard Gaussian vectors. Let $z _ { 1 } , \\cdots z _ { k }$ be the normalized row vectors of $A ^ { - 1 }$ . Let $\\hat { z } _ { 1 } , . . . , \\hat { z } _ { k }$ be the eigenvectors of $\\hat { X } \\hat { Y } ^ { - 1 }$ (after sign flip). For any $\\delta > 0$ and small enough $\\epsilon _ { \\mathrm { { \\mathrm { { } } } } }$ , with $O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )$ number of i.i.d. samples in $\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]$ , with probability at least $1 - \\delta$ over the randomness of $\\zeta _ { 1 } , \\zeta _ { 2 }$ and i.i.d. samples, there exists a permutation $\\pi ( i ) \\in [ \\dot { k } ]$ such that ", + "bbox": [ + 173, + 729, + 825, + 825 + ], + "page_idx": 20 + }, + { + "type": "equation", + "img_path": "images/479ebdc9be9eb6d30a3812a68559d3c0cc96846422cdd6be07f7c9d174e59a64.jpg", + "text": "$$\n\\begin{array} { r } { \\| \\hat { z } _ { i } - z _ { \\pi [ i ] } \\| \\le p o l y ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 367, + 832, + 627, + 849 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "for any $1 \\leq i \\leq k$ ", + "bbox": [ + 171, + 854, + 295, + 871 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Finally, given $\\hat { z } _ { i }$ ’s, the problem reduces to a one-layer problem. We will first give an analysis for Algorithm 1 as a warm-up. When we call Algorithm 1 from Algorithm 3, the situation is slightly different. Note we reserve fresh samples for this step, so that the samples used by Algorithm 1 are still independent with the estimate $\\hat { z } _ { i }$ (learned using the other set of samples). However, since $\\hat { z } _ { i }$ is not equal to $z _ { i }$ , this introduces an additional error term $\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y$ which is not independent of $x$ and cannot be captured by $\\xi$ . We modify the proof for Algorithm 1 to show that the algorithm is still robust as long as $\\| \\hat { z } _ { i } - z _ { i } \\|$ is small enough. ", + "bbox": [ + 174, + 881, + 825, + 924 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 103, + 825, + 160 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Lemma 13. Assume that $\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }$ and $\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma$ . Suppose that for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any \u000f ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ4\u000f2 ) number of samples for Algorithm $^ { l }$ , we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 171, + 162, + 825, + 214 + ], + "page_idx": 21 + }, + { + "type": "equation", + "img_path": "images/2331d3bf506bfc4d6ba28306e887705bd9fc1c1ba29b9ae951a099b508a8da02.jpg", + "text": "$$\n\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 369, + 219, + 627, + 256 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "for each $1 \\leq i \\leq k$ . ", + "bbox": [ + 173, + 261, + 303, + 276 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Combining the above three lemmas, we prove Theorem 7 in Section B.4. ", + "bbox": [ + 173, + 287, + 650, + 304 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "B.1 ROBUST ANALYSIS FOR FINDING THE SPAN OF $\\{ \\mathrm { V E C } ^ { * } ( z _ { i } z _ { j } ^ { \\top } ) \\}$ ’ S ", + "bbox": [ + 176, + 318, + 660, + 337 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "We first prove that the step of finding the span of $\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { j } ^ { \\top } ) \\}$ is robust. The main idea is based on standard matrix perturbation bounds (see Section D.2). We first give a lowerbound on the $k _ { 2 }$ -th singular value of $T$ , giving a spectral gap between the smallest non-zero singular value and the null space. See the lemma below. The proof is given in Section B.1.1. ", + "bbox": [ + 173, + 348, + 825, + 405 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Lemma 14. Suppose $\\sigma _ { \\mathrm { m i n } } ( M ) \\geq \\alpha , \\sigma _ { \\mathrm { m i n } } ( A ) \\geq \\beta$ , we know that matrix $T$ has rank $k _ { 2 }$ and the $k _ { 2 }$ -th singular value of $T$ is lower bounded by $\\dot { \\alpha } \\beta ^ { 2 }$ . ", + "bbox": [ + 173, + 409, + 823, + 438 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Then we show that with enough samples the estimate $\\hat { T }$ is close enough to $T$ , so Wedin’s Theorem (Lemma 25) implies the subspace found is also close to the true nullspace of $T$ . The proof is deferred to Section B.1.2. ", + "bbox": [ + 173, + 450, + 826, + 493 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Lemma 15. Assume that $\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }$ and $\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma > 0$ , then for any $\\epsilon \\leq \\gamma / 2 ,$ , for any $1 > \\delta > 0$ , given $\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of i.i.d. samples, we know ", + "bbox": [ + 173, + 497, + 825, + 535 + ], + "page_idx": 21 + }, + { + "type": "equation", + "img_path": "images/abc7ca62e3ec925997666ec59403b38cbfd525aeb6fdeab9a21cb64044ef45ae.jpg", + "text": "$$\n\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 444, + 542, + 550, + 563 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 568, + 375, + 583 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Finally we combine the above two lemmas and show that the span of the least $k$ right singular vectors of $\\hat { T }$ is close to the null space of $T$ . ", + "bbox": [ + 173, + 594, + 825, + 626 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Lemma 11. Under the same assumptions as in Theorem 7, let $S \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }$ be the matrix whose $k$ columns are the $k$ least right singular vectors of $T$ . Similarly define $\\hat { S } \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }$ for empirical estimate $\\hat { T }$ . Then for any $\\epsilon \\leq \\gamma / 2 ,$ , for any $\\delta < 1$ , given $\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\dot { \\Gamma } P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } . } \\end{array}$ ) number of i.i.d. samples, we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 630, + 826, + 696 + ], + "page_idx": 21 + }, + { + "type": "equation", + "img_path": "images/10f34eb23d02b3f5e2031d0832179b2b9f311310a62f7adbefee6210d14c369c.jpg", + "text": "$$\n\\lVert S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\rVert \\leq \\frac { \\sqrt { 2 } \\epsilon } { \\alpha \\beta ^ { 2 } } .\n$$", + "text_format": "latex", + "bbox": [ + 416, + 703, + 581, + 738 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "Proof. According to Lemma 15, given $\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of i.i.d. samples, we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 752, + 823, + 789 + ], + "page_idx": 21 + }, + { + "type": "equation", + "img_path": "images/94b25f5782ec291f0d1df7c1aeb912811374793f779048646c95556c63218f0c.jpg", + "text": "$$\n\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon .\n$$", + "text_format": "latex", + "bbox": [ + 444, + 787, + 550, + 806 + ], + "page_idx": 21 + }, + { + "type": "text", + "text": "According to Lemma 14, we know $\\sigma _ { k _ { 2 } } ( T ) \\geq \\alpha \\beta ^ { 2 }$ . Then, due to Lemma 27, we have ", + "bbox": [ + 174, + 808, + 730, + 825 + ], + "page_idx": 21 + }, + { + "type": "equation", + "img_path": "images/2030782e9edae6ada699ed1394e4df9d041a9e12c4977efd4a61ee0a57bbadeb.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| \\leq \\displaystyle \\frac { \\sqrt { 2 } \\| T - \\hat { T } \\| _ { F } } { \\sigma _ { k _ { 2 } } ( T ) } } \\\\ & { \\qquad \\leq \\displaystyle \\frac { \\sqrt { 2 } \\epsilon } { \\alpha \\beta ^ { 2 } } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 388, + 830, + 607, + 905 + ], + "page_idx": 21 + }, + { + "type": "image", + "img_path": "images/d88852d23cdc3297faa4803e06e6a47efe5846f9cd128c8a3167800d9f70de02.jpg", + "image_caption": [ + "Figure 5: Characterize $\\mathrm { T }$ as the product of four matrices. " + ], + "image_footnote": [], + "bbox": [ + 336, + 99, + 658, + 246 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "B.1.1 LOWERBOUNDING $k _ { 2 }$ -TH SINGULAR VALUE OF $T$ ", + "text_level": 1, + "bbox": [ + 173, + 295, + 575, + 310 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "In order to lowerbound the $k _ { 2 }$ -th singular value of $T$ , we first express $T$ as the product of four simpler matrices, $T = M B C F$ , as illustrated in Figure 5. The definitions of these four matrices $M \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + 1 ) } , B \\in \\mathbb { R } ^ { ( k _ { 2 } + 1 ) \\times k _ { 2 } } , C \\in \\mathbb { R } ^ { ( k _ { 2 } \\times k ^ { 2 } ) } , F \\in \\mathbb { R } ^ { k ^ { 2 } \\times ( k _ { 2 } + k ) }$ will be introduced later as we explain their effects. From Lemma 9, we know that ", + "bbox": [ + 173, + 319, + 825, + 378 + ], + "page_idx": 22 + }, + { + "type": "equation", + "img_path": "images/55361563ac28a05aff16376e93ac91265089c86c2d766da4a4c3385b159371b1.jpg", + "text": "$$\nT \\mathrm { v e c } ^ { * } ( U ) = \\sum _ { \\substack { 1 \\leq i < j \\leq k } } ( A ^ { \\top } U A ) _ { i j } M _ { i j } - \\big ( \\sum _ { \\substack { 1 \\leq i < j \\leq k } } ( A ^ { \\top } U A ) _ { i j } m _ { i j } \\big ) \\mathbb { E } [ x \\otimes x ] ,\n$$", + "text_format": "latex", + "bbox": [ + 246, + 382, + 748, + 420 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "for any symmetric $k \\times k$ matrix $U$ . ", + "bbox": [ + 173, + 422, + 405, + 438 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Note that ${ \\mathrm { v e c } } ^ { * } ( U )$ is a $( k _ { 2 } + k )$ -dimensional vector. For convenience, we first use matrix $F$ to transform vec $^ * ( U )$ to ${ \\mathrm { v e c } } ( U )$ , which has $k ^ { 2 }$ dimensions. Matrix $F$ is defined such that $F \\mathrm { v e c } ^ { * } ( U ) =$ ${ \\mathrm { v e c } } ( U )$ , for any $k \\times k$ symmetric matrix $U$ . Note that this is very easy as we just need to duplicate all the non-diagonal entries. ", + "bbox": [ + 173, + 444, + 825, + 501 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Second, we hope to get the coefficients $( A ^ { \\top } U A ) _ { i j }$ ’s. Notice that ", + "bbox": [ + 173, + 506, + 599, + 522 + ], + "page_idx": 22 + }, + { + "type": "equation", + "img_path": "images/2350d1362d8ca2d7825881e97510182910f2a4fe8c067b70a536a364d936ce7f.jpg", + "text": "$$\n\\operatorname { v e c } ( A ^ { \\top } U A ) = A ^ { \\top } \\otimes A ^ { \\top } \\operatorname { v e c } ( U ) = A ^ { \\top } \\otimes A ^ { \\top } F \\operatorname { v e c } ^ { * } ( U ) .\n$$", + "text_format": "latex", + "bbox": [ + 305, + 527, + 691, + 546 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Since we only care about the elements of $A ^ { \\top } U A$ at the $i j$ -th position for $1 \\leq i < j \\leq k$ , we just pick corresponding rows of $A ^ { \\top } \\otimes A ^ { \\top }$ to construct our matrix $C$ , which has dimension $k _ { 2 } \\times k ^ { 2 }$ . ", + "bbox": [ + 174, + 550, + 821, + 580 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "The first matrix $M$ is the augmented distinguishing matrix (see Definition 1). In order to better understand the reason that we need matrix $B$ , let’s first re-write $T \\mathrm { v e c } ^ { * } ( U )$ in the following way: ", + "bbox": [ + 174, + 585, + 823, + 616 + ], + "page_idx": 22 + }, + { + "type": "equation", + "img_path": "images/49f47d4533a79951b3a935fc43ccc7d1cf9ded76265803ef5ee4d0a751e29f27.jpg", + "text": "$$\nT \\mathrm { v e c } ^ { * } ( U ) = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } U A ) _ { i j } \\Bigl ( M _ { i j } - m _ { i j } \\mathbb { E } [ x \\otimes x ] \\Bigr ) .\n$$", + "text_format": "latex", + "bbox": [ + 310, + 619, + 686, + 656 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Thus, $T \\mathrm { v e c } ^ { * } ( U )$ is just a linear combination of $( M _ { i j } - m _ { i j } { \\mathbb E } [ x \\otimes x ] )$ ’s with coefficients equal to $( A ^ { \\top } U A ) _ { i j }$ ’s. We have already expressed coefficients $( A ^ { \\top } U A ) _ { i j }$ ’s using $C F \\mathrm { v e c } ^ { * } ( U )$ . Now, we just need to use matrix $B$ to transform the augmented distinguishing matrix $M$ to a $d ^ { 2 } \\times k _ { 2 }$ matrix, with each column equal to $( M _ { i j } - m _ { i j } { \\mathbb E } [ x \\stackrel { \\sim } { \\otimes } x ] )$ . In order to achieve this, the first $k _ { 2 }$ rows of $B$ is just the identity matrix $I _ { k _ { 2 } }$ , and the last row of $B$ is $[ - m _ { 1 2 } , - m _ { 1 3 } , \\cdot \\cdot \\cdot , - m _ { 1 k } , - m _ { 2 3 } , - m _ { 2 4 } , \\cdot \\cdot \\cdot ] ^ { \\intercal }$ . ", + "bbox": [ + 173, + 660, + 825, + 738 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "With above characterization of $T$ , we are ready to show that the $k _ { 2 }$ -th singular value of $T$ is lower bounded. ", + "bbox": [ + 173, + 742, + 823, + 771 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Lemma 14. Suppose $\\sigma _ { \\mathrm { m i n } } ( M ) \\geq \\alpha , \\sigma _ { \\mathrm { m i n } } ( A ) \\geq \\beta$ , we know that matrix $T$ has rank $k _ { 2 }$ and the $k _ { 2 }$ -th singular value of $T$ is lower bounded by $\\dot { \\alpha } \\beta ^ { 2 }$ . ", + "bbox": [ + 173, + 773, + 823, + 804 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Proof. Since matrix $C$ has dimension $k _ { 2 } \\times k ^ { 2 }$ , it’s clear that the rank of $T$ is at most $k _ { 2 }$ . We first prove that the rank of $T$ is exactly $k _ { 2 }$ . ", + "bbox": [ + 171, + 818, + 823, + 848 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Since the first $k _ { 2 }$ rows of $B$ constitute the identity matrix $I _ { k _ { 2 } }$ , we know $B$ is a full-column rank matrix with rank equal to $k _ { 2 }$ . We also know that matrix $M$ is a full column rank matrix with rank $k _ { 2 } + 1$ . Thus, the product matrix $M B$ is still a full-column rank matrix with rank $k _ { 2 }$ . If we can prove that the product matrix $C F$ has full-row rank equal to $k _ { 2 }$ . It’s clear that $T = M B C F$ also has rank $k _ { 2 }$ . Next, we prove that $C F$ has full-row rank. ", + "bbox": [ + 173, + 853, + 825, + 924 + ], + "page_idx": 22 + }, + { + "type": "text", + "text": "Since $\\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta$ , we know $A ^ { \\top } \\otimes A ^ { \\top }$ is full rank, and a subset of its rows $C$ has full row rank. For the sake of contradiction, suppose that there exists non-zero vector $a \\in \\mathbb { R } ^ { k _ { 2 } }$ , such that ${ \\textstyle \\sum } _ { l = 1 } ^ { k _ { 2 } } a _ { l } ( C F ) _ { [ l , : ] } = 0$ . Note that for any $1 \\leq l \\leq k _ { 2 }$ , $( C F ) _ { [ l , i i ] } = C _ { [ l , i i ] }$ for $1 \\leq i \\leq k$ and $( C F ) _ { [ l , i j ] } = C _ { [ l , i j ] } + C _ { [ l , j i ] }$ for $1 \\leq i < j \\leq k$ . Since $C$ consists of a subset of rows of $A ^ { \\top } \\otimes A ^ { \\top }$ , we know $C _ { [ l , i j ] } = C _ { [ l , j i ] }$ for any $l$ and any $i < j$ . Thus, ${ \\textstyle \\sum } _ { l = 1 } ^ { k _ { 2 } } a _ { l } ( C F ) _ { [ l , : ] } = 0$ simply implies $\\begin{array} { r } { \\sum _ { l = 1 } ^ { k _ { 2 } } a _ { l } C _ { [ l , : ] } = 0 } \\end{array}$ , which breaks the fact that $C$ is full-row rank. Thus, the assumption is false and $C F$ ", + "bbox": [ + 173, + 101, + 826, + 215 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "Now, let’s prove that the $k _ { 2 }$ -th singular value of $T$ is lower bounded. We first show that in the product characterization of $T$ , the smallest singular value of each individual matrix is lower bounded. According to the assumption, we know the smallest singular value of $M$ is lower bounded by $\\alpha$ . Since the first $k _ { 2 }$ rows of matrix $B$ constitute a $k _ { 2 } \\times k _ { 2 }$ identity matrix, we know ", + "bbox": [ + 173, + 220, + 825, + 279 + ], + "page_idx": 23 + }, + { + "type": "equation", + "img_path": "images/a2128adfdeff46de4d6917a6c1410b69662b4b38b138b842628d07e0ea0f6860.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( B ) : = \\operatorname* { m i n } _ { u : \\| u \\| \\leq 1 } \\| B u \\| \\geq \\operatorname* { m i n } _ { u : \\| u \\| \\leq 1 } \\| I _ { k _ { 2 } \\times k _ { 2 } } u \\| = : \\sigma _ { \\operatorname* { m i n } } ( I _ { k _ { 2 } \\times k _ { 2 } } ) = 1 ,\n$$", + "text_format": "latex", + "bbox": [ + 263, + 285, + 733, + 310 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "where $u$ is any $k _ { 2 }$ -dimensional vector. ", + "bbox": [ + 174, + 319, + 423, + 333 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "Since $\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta$ , we know $\\sigma _ { \\operatorname* { m i n } } ( A ^ { \\top } \\otimes A ^ { \\top } ) \\geq \\beta ^ { 2 }$ . According to the construction of $C$ , we know $C$ consists a subset of rows of $A ^ { \\top } \\otimes A ^ { \\top }$ . Denote the indices of the row not picked as $S$ . We have ", + "bbox": [ + 173, + 338, + 823, + 369 + ], + "page_idx": 23 + }, + { + "type": "equation", + "img_path": "images/75da9807219e59207202c0585c6e0914b9bd8251600f85b4f4f653e4bbe61961.jpg", + "text": "$$\n\\begin{array} { r l } & { \\sigma _ { \\operatorname* { m i n } } ( C ) : = \\underset { u : \\| u \\| \\leq 1 } { \\mathrm { m i n } } \\| u ^ { \\top } C \\| } \\\\ & { \\qquad = \\underset { v : \\| v \\| \\leq 1 } { \\mathrm { m i n } } \\underset { \\Lambda ( v _ { i } = 0 , \\forall i \\in S ) } { \\mathrm { m i n } } \\| v ^ { \\top } ( A ^ { \\top } \\otimes A ^ { \\top } ) \\| } \\\\ & { \\qquad \\geq \\underset { v : \\| v \\| \\leq 1 } { \\mathrm { m i n } } \\| v ^ { \\top } ( A ^ { \\top } \\otimes A ^ { \\top } ) \\| } \\\\ & { \\qquad = : \\sigma _ { \\operatorname* { m i n } } ( A ^ { \\top } \\otimes A ^ { \\top } ) } \\\\ & { \\qquad \\geq \\beta ^ { 2 } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 328, + 375, + 669, + 502 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "where $u$ has dimension $k _ { 2 }$ and $v$ has dimension $k ^ { 2 }$ . ", + "bbox": [ + 173, + 508, + 509, + 525 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "We lowerbound the smallest singular value of $C F$ by showing that $\\sigma _ { \\mathrm { m i n } } ( C F ) \\geq \\sigma _ { \\mathrm { m i n } } ( C )$ . For any unit vector $u \\in \\mathbb { R } ^ { k _ { 2 } }$ , we know $[ \\Breve { \\boldsymbol { u } } ^ { \\top } \\boldsymbol { C } \\boldsymbol { F } ] _ { i i } = [ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { i i }$ for any $i$ and $[ u ^ { \\top } C \\dot { F } ] _ { i j } = [ u ^ { \\top } C ] _ { i j } + [ u ^ { \\top } C ] _ { j i }$ for any $i < j$ . We also know $[ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { i j } = [ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { j i }$ for $i < j$ . Thus, we know for any unit vector $u$ , $\\| u ^ { \\top } C F \\| \\geq \\| u ^ { \\top } C \\|$ , which implies $\\sigma _ { \\mathrm { m i n } } ( C F ) \\geq \\sigma _ { \\mathrm { m i n } } ( C )$ . ", + "bbox": [ + 173, + 530, + 825, + 592 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "Finally, since in the beginning we have proved that matrix $T$ has rank $k _ { 2 }$ , the $k _ { 2 }$ -th singular value is exactly the smallest non-zero singular value of $T$ . Denote the smallest non-zero singular of $T$ as $\\sigma _ { \\mathrm { m i n } } ^ { + } ( T ) \\dot { }$ , we have ", + "bbox": [ + 173, + 597, + 825, + 640 + ], + "page_idx": 23 + }, + { + "type": "equation", + "img_path": "images/5c397189faaf2a4e6d987439c0dfce8a8968419ab712c6e328e646ededa1079c.jpg", + "text": "$$\n\\begin{array} { r l } & { \\sigma _ { k _ { 2 } } ( T ) = \\sigma _ { \\operatorname* { m i n } } ^ { + } ( T ) } \\\\ & { \\qquad \\quad \\geq \\sigma _ { \\operatorname* { m i n } } ( M ) \\sigma _ { \\operatorname* { m i n } } ( B ) \\sigma _ { \\operatorname* { m i n } } ( C F ) } \\\\ & { \\qquad \\quad \\geq \\alpha \\beta ^ { 2 } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 369, + 647, + 629, + 705 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "where the first inequality holds because both $M$ and $B$ has full column rank. ", + "bbox": [ + 173, + 712, + 674, + 727 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "B.1.2 UPPERBOUNDING $\\Vert \\hat { T } - T \\Vert _ { F }$ ", + "text_level": 1, + "bbox": [ + 174, + 744, + 429, + 762 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "In this section, we prove that given polynomial number of samples, $\\Vert \\hat { T } - T \\Vert _ { F }$ is small with high probability. We do this by standard matrix concentration inequalities. Note that our requirements on the norm of $x$ is just for convenience, and the same proof works as long as $x$ has reasonable tail-behavior (e.g. sub-Gaussian). ", + "bbox": [ + 173, + 772, + 825, + 830 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "Lemma 15. Assume that $\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }$ and $\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma > 0$ , then for any $\\epsilon \\leq \\gamma / 2 ,$ , for any $1 > \\delta > 0$ , given $\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of i.i.d. samples, we know ", + "bbox": [ + 171, + 833, + 823, + 872 + ], + "page_idx": 23 + }, + { + "type": "equation", + "img_path": "images/bb0565db696f574bb7261888426f6c7838272ed5d4271510367c901a0fde288d.jpg", + "text": "$$\n\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 444, + 880, + 550, + 900 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 906, + 375, + 921 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "Proof. In order to get an upper bound for $\\| { \\hat { T } } - T \\| _ { F }$ , we first show that $\\Vert \\hat { T } - T \\Vert _ { 2 }$ is upper bounded. We know ", + "bbox": [ + 173, + 102, + 823, + 132 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/586a8f16e62a0d339f7fb97b75f7380597a4cc7ff916a95e8b2a0f818fc1a500.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| T - \\hat { T } \\| = \\underset { v \\in \\mathbb { R } ^ { k _ { 2 } + k } : \\| v \\| \\leq 1 } { \\operatorname* { m a x } } \\| ( T - \\hat { T } ) v \\| } \\\\ & { \\qquad \\leq \\underset { U \\in \\mathbb { R } _ { s y m } ^ { k \\times k } : \\| U \\| _ { F } \\leq \\sqrt { 2 } } { \\operatorname* { m a x } } \\| ( T - \\hat { T } ) { \\mathrm { v e c } } ^ { * } ( U ) \\| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 331, + 136, + 666, + 196 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "For any $k \\times k$ symmetric matrix $U$ with eigenvalue decomposition $\\begin{array} { r } { U = \\sum _ { i = 1 } ^ { k } \\lambda _ { i } u ^ { ( i ) } ( u ^ { ( i ) } ) ^ { \\top } } \\end{array}$ , according to the definition of , we know ", + "bbox": [ + 169, + 205, + 823, + 236 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/2992ac200df2bcd7c36da3f324e95edd88e5c98dea6ccd6f7b3e731153ad2ed2.jpg", + "text": "$$\n\\begin{array} { r l } { \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T - \\widetilde { T } | \\operatorname* { m e s } ^ { * } ( | U | ) | = } & { \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T \\nabla i - \\widetilde { T } | \\nabla i ) - \\widetilde { T } \\mathrm { e n } ^ { * } ( | U | ) } \\\\ & { \\leq \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | \\nabla i - \\widetilde { T } | \\langle u ^ { ( i ) } \\rangle - \\widetilde { T } ( u ^ { ( k ) } \\rangle ) | } \\\\ & { \\leq \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | \\nabla i - \\widetilde { T } | \\langle u ^ { ( i ) } \\rangle - \\widetilde { T } ( u ^ { ( k ) } \\rangle | } \\\\ & { < ( \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } | \\nabla i - \\widetilde { T } | \\nabla i ) } \\\\ & { < ( \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } | T ( u ^ { ( k ) } - \\widetilde { T } ( u ) | ) | } \\\\ & { \\leq \\widetilde { T } \\overline { { \\operatorname* { m a x } } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T \\nabla i - \\widetilde { T } ( u ^ { ( k ) } | ) | } \\\\ & \\leq \\widetilde { T } \\overline { { \\operatorname* { m a x } } } \\underset { i = \\varrho } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 220, + 242, + 776, + 517 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "where ${ \\hat { f } } ( u ) = { \\hat { T } } \\mathrm { v e c } ^ { * } ( u u ^ { \\top } )$ and the fourth inequality uses the Cauchy-Schwarz inequality. Next, we only need to upper bound $\\begin{array} { r } { \\operatorname* { m a x } _ { u : \\| u \\| \\leq 2 } \\| f ( u ) - \\hat { f } ( u ) \\| } \\end{array}$ . Recall that ", + "bbox": [ + 174, + 526, + 823, + 560 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/377e03f9f97f2e28cc3fa82948975b73840fedacc5a3d962d6656d50c9661789.jpg", + "text": "$$\n\\begin{array} { r l } & { f ( u ) = 2 { \\mathbb E } \\big [ ( u ^ { \\top } y ) \\cdot ( { \\mathbb E } [ ( u ^ { \\top } y ) x ^ { \\top } ] { \\mathbb E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - { \\mathbb E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { \\qquad + \\Big ( { \\mathbb E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - 2 { \\mathbb E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] { \\mathbb E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } { \\mathbb E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) { \\mathbb E } [ x \\otimes x ] , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 238, + 565, + 758, + 616 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "and ", + "bbox": [ + 173, + 621, + 202, + 635 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/dac625c62f11a650b25749cee326b814732e85479abfc14bdeb5f9478315980f.jpg", + "text": "$$\n\\begin{array} { r l } & { \\hat { f } ( u ) = 2 \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) \\cdot ( \\hat { { { \\mathbb E } } } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\hat { { { \\mathbb E } } } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { \\qquad + \\Big ( \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - 2 \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { { { \\mathbb E } } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { { { \\mathbb E } } } [ x \\otimes x ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 238, + 638, + 758, + 689 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "Notice that ", + "bbox": [ + 173, + 694, + 250, + 709 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/2bcaf1fb0027ed8ddf23adefa900598aec1de84b17b757450cf7f044a5b99298.jpg", + "text": "$$\n\\begin{array} { r } { \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] \\Big ) ^ { \\top } = \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 712, + 825, + 743 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "We first show that given polynomial number of samples, ", + "bbox": [ + 173, + 750, + 544, + 765 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/c7cbecf0a22079f387113ba2f456a95f036c7fce425a481c8e87c4a536120ea7.jpg", + "text": "$$\n\\left| 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] \\right|\n$$", + "text_format": "latex", + "bbox": [ + 181, + 771, + 825, + 796 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "is upper bounded with high probability. ", + "bbox": [ + 173, + 804, + 434, + 819 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "Since each row of $W$ has unit norm, we have $\\| W \\| \\le \\sqrt { k }$ . Due to the assumption that $\\| x \\| \\leq$ $\\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }$ , we have ", + "bbox": [ + 171, + 825, + 823, + 856 + ], + "page_idx": 24 + }, + { + "type": "equation", + "img_path": "images/11b394923d3614672f2d1c8541d48f367f871704e362d4861a9b14dcf217944c.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| ( u ^ { \\top } y ) x ^ { \\top } \\| \\leq \\| u \\| \\| A \\sigma ( W x ) + \\xi \\| \\| x \\| } \\\\ & { \\qquad \\leq \\| u \\| ( \\| A \\| \\| W \\| \\| x \\| + \\| \\xi \\| ) \\| x \\| } \\\\ & { \\qquad \\leq 2 \\Gamma ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 349, + 861, + 648, + 922 + ], + "page_idx": 24 + }, + { + "type": "text", + "text": "According to Lemma 24, we know given $O ( \\frac { \\Gamma ^ { 2 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ number of samples, ", + "bbox": [ + 173, + 99, + 745, + 122 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/b59855c8f02367ef9c2810dc721d364aeb80b6b501e5ff7a18224f6b41184949.jpg", + "text": "$$\n\\begin{array} { r } { | | \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] | \\leq \\epsilon , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 374, + 126, + 620, + 154 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 154, + 375, + 170 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "Similarly, we can show that given $O ( \\frac { \\Gamma ^ { 6 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ number of samples, ", + "bbox": [ + 173, + 175, + 699, + 196 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/063a12f0cfcdff4187fa93ef4d7409d22daf925e0d1c65584652614d8b49a047.jpg", + "text": "$$\n\\begin{array} { r } { \\left\\| \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] \\right\\| \\leq \\epsilon , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 323, + 200, + 673, + 227 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 229, + 375, + 244 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "$\\| x x ^ { \\top } \\| \\leq \\Gamma ^ { 2 }$ , we know that given $O \\big ( \\frac { \\Gamma ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } \\big )$ number of samples, ", + "bbox": [ + 173, + 251, + 658, + 272 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/b05fb4c9b92262808b82c45d35b47f649954320b26ed1b113e85afbe9bed2ff1.jpg", + "text": "$$\n\\left\\| \\triangleq [ x x ^ { \\top } ] - \\mathbb { E } [ x x ^ { \\top } ] \\right\\| \\leq \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 406, + 275, + 589, + 301 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . Suppose that $\\epsilon \\leq \\gamma / 2 \\leq \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) / 2$ , we know $\\hat { \\mathbb { E } } [ x x ^ { \\top } ]$ has full rank. According to Lemma 29, we have ", + "bbox": [ + 171, + 306, + 825, + 335 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/901295b3693cccc9c7c7250eeecf69e4d9a52b15bb6b754f9956cc24dcbaaa5d.jpg", + "text": "$$\n\\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\right\\| \\leq 2 \\sqrt { 2 } \\frac { \\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\right\\| } { \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( \\mathbb { E } [ x x ^ { \\top } ] ) } \\leq 2 \\sqrt { 2 } \\epsilon / \\gamma ^ { 2 } ,\n$$", + "text_format": "latex", + "bbox": [ + 259, + 338, + 735, + 376 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 378, + 375, + 393 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "By union bound, we know for any $\\epsilon < \\gamma / 2$ , given $O ( \\frac { \\Gamma ^ { 6 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ number of samples, with probability at least , we have ", + "bbox": [ + 173, + 400, + 825, + 434 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/0891c3b5e433721d5b8e191c3c877665df64ec416ff92a7db3e721a871d59cc2.jpg", + "text": "$$\n\\begin{array} { r l } & { \\left\\| \\hat { \\mathbb E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] - \\mathbb E \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\right\\| \\leq \\epsilon , } \\\\ & { \\left\\| \\hat { \\mathbb E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } - \\mathbb E \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\right\\| \\leq 2 \\sqrt { 2 } \\epsilon / \\gamma ^ { 2 } , } \\\\ & { \\left\\| \\hat { \\mathbb E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] - \\mathbb E \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] \\right\\| \\leq \\epsilon . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 321, + 435, + 674, + 520 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "Define ", + "bbox": [ + 173, + 521, + 220, + 535 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/5060611debc2ffbdbbb73ddadfe0bb468a43a723ce13f7d9ec862fed9bf2237d.jpg", + "text": "$$\n\\begin{array} { r l } & { E _ { 1 } : = \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] , } \\\\ & { E _ { 2 } : = \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } , } \\\\ & { E _ { 3 } : = \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 323, + 535, + 673, + 603 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "Then, we have ", + "bbox": [ + 173, + 603, + 272, + 617 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/4411be09e93f983be534a731aa91addc193a4cd57d072d7011424363ec8afaf5.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| 2 \\tilde { \\mathbb { E } } [ ( \\pi ^ { \\top } y ) x ^ { \\top } ] \\tilde { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\tilde { \\mathbb { E } } [ ( \\pi ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } ] - 2 \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } ] } \\\\ & { \\leq 2 \\| E [ \\| E _ { 3 } \\| ] [ E _ { 3 } ] + 2 \\| E _ { 1 } \\| \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\| \\| \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } ] \\| } \\\\ & { \\quad + 2 \\| \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ^ { \\top } ] \\| \\| E _ { 2 } \\| \\| E _ { 3 } [ ( \\pi ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } ] \\| + 2 \\| \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ^ { \\top } ] \\| \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\| \\| E _ { 3 } ] \\| } \\\\ & { \\quad + 2 \\| E _ { 1 } \\| \\| E _ { 2 } \\| \\| \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } ] \\| + 2 \\| \\mathbb { E } [ ( \\pi ^ { \\top } y ) x ^ { \\top } ] \\| \\| E _ { 3 } \\| + 2 \\| E _ { 1 } \\| \\| E _ { 1 } x ^ { \\top } ] ^ { - 1 } \\| \\| } \\\\ & { \\leq 2 \\Big ( \\frac { 2 \\sqrt { 2 } \\epsilon ^ { 3 } } { \\gamma ^ { 2 } } + \\frac { 2 \\| ^ { 3 } ( \\Gamma ^ { \\top } \\Gamma \\| _ { \\sqrt { 1 } } \\sqrt { K } + F _ { 2 } ) \\epsilon } { \\gamma } + \\frac { 8 \\sqrt { 2 } \\Gamma ^ { 4 } ( \\Gamma \\| _ { \\sqrt { 1 } } \\sqrt { K } + F _ { 2 } ) ^ { 2 } \\epsilon } { \\gamma ^ { 2 } } + \\frac { 2 \\Gamma ( \\Gamma P _ { 1 } \\sqrt { K } + F _ { 2 } ) \\epsilon } { \\gamma } } \\\\ & \\quad + \\frac { 4 \\sqrt { 2 } \\Gamma ^ { 3 } ( \\Gamma P _ { 1 } \\sqrt { K } + F _ { 2 } ) \\epsilon ^ { 2 } } { \\gamma ^ { 2 } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 166, + 618, + 816, + 820 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "Thus, given $\\begin{array} { r } { O ( \\frac { \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of samples, we know ", + "bbox": [ + 173, + 827, + 622, + 849 + ], + "page_idx": 25 + }, + { + "type": "equation", + "img_path": "images/9efb2127aaf265700bdb776f4e2ae13e700db56eb3a62bc4bb6a8e68a137b843.jpg", + "text": "$$\n\\begin{array} { r l } & { \\left\\| 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) \\cdot ( \\hat { \\mathbb { E } } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) ^ { \\top } \\big ] \\right\\| } \\\\ & { - \\left\\| 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] \\right\\| } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 852, + 839, + 910 + ], + "page_idx": 25 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 103, + 374, + 118 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Now, let’s consider the second term ", + "bbox": [ + 174, + 125, + 410, + 140 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/02bb5c244011d016e83efe71826b66cd2f833abcdfefc0152ccfbfa6406842ee.jpg", + "text": "$$\n\\begin{array} { r } { \\left\\| \\hat { \\mathbb E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] - \\mathbb E \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] \\right\\| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 349, + 142, + 645, + 170 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Since $\\begin{array} { r l r } { \\left\\| ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\right\\| } & { \\leq } & { 4 \\Gamma ^ { 2 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } } \\end{array}$ , according to Lemma 24, we know given $O ( \\frac { \\Gamma ^ { 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ , ", + "bbox": [ + 173, + 172, + 826, + 212 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/f6d1cfcc78230df3137d98c7a6fe3eaad1167f4dfccde2f0818c460068473d6b.jpg", + "text": "$$\n\\begin{array} { r } { \\left| \\left| \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] \\right| \\right| \\leq \\epsilon , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 334, + 215, + 660, + 243 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 173, + 246, + 375, + 261 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Next, let’s look at the third term ", + "bbox": [ + 173, + 267, + 385, + 281 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/374cd4212bac42a0629abc5b7af9f21678ec3c25fb91b4fb168eae6937b91c9c.jpg", + "text": "$$\n\\begin{array} { r } { \\Big \\| \\mathbb { \\hat { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { \\hat { E } } [ x \\otimes x ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { E } [ x \\otimes x ] \\Big \\| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 343, + 284, + 651, + 311 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Again, using Lemma 24 and union bound, we know given $O ( \\frac { \\Gamma ^ { 2 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ number of samples, we have ", + "bbox": [ + 176, + 315, + 823, + 351 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/9027949a317d143067e6f892b81bca9a65e74142f255d7bce7f4f85ecf43712c.jpg", + "text": "$$\n\\begin{array} { r l } & { \\left\\| \\hat { \\mathbb E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - \\mathbb E \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\right\\| \\leq \\epsilon , } \\\\ & { \\left\\| \\hat { \\mathbb E } [ x \\otimes x ] - \\mathbb E [ x \\otimes x ] \\right\\| \\leq \\epsilon . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 385, + 352, + 607, + 409 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Thus, Define ", + "bbox": [ + 173, + 410, + 261, + 425 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/5da68b54ebdb674e9d5ba0f603f6c991362b61e6ecc614f9018cf74071a40c4b.jpg", + "text": "$$\n\\begin{array} { r l } & { E _ { 4 } : = \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] } \\\\ & { E _ { 5 } : = \\mathbb { \\hat { E } } [ x \\otimes x ] - \\mathbb { E } [ x \\otimes x ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 390, + 426, + 606, + 469 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Then, we have ", + "bbox": [ + 173, + 470, + 272, + 486 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/5176b95133face87bdc5b149a13fd0dd46847f460c6ab3e097cde8aea1696213.jpg", + "text": "$$\n\\begin{array} { r l } & { \\left| \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\hat { \\mathbb { E } } [ x \\otimes x ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { E } [ x \\otimes x ] \\right| \\Big | \\leq \\| E _ { 4 } \\| \\| E _ { 5 } \\| + \\| E _ { 4 } \\| \\| \\mathbb { E } [ x \\otimes x ] \\| + \\| \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\| \\| E _ { 5 } \\| } \\\\ & { \\qquad \\leq \\epsilon ^ { 2 } + \\Gamma ^ { 2 } \\epsilon + 4 ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\epsilon } \\\\ & { \\qquad = O ( ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\epsilon ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 178, + 488, + 852, + 559 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Thus, we know that given $O ( \\frac { \\Gamma ^ { 2 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ number of samples, we know ", + "bbox": [ + 173, + 561, + 707, + 584 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/6753095e9c98ace5b3d81efc582ff16a7da6fc716b896faee9a11f151b2cd844.jpg", + "text": "$$\n\\begin{array} { r } { \\left| \\left| \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\hat { \\mathbb { E } } [ x \\otimes x ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { E } [ x \\otimes x ] \\right| \\right| \\leq \\epsilon , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 328, + 587, + 666, + 614 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 617, + 375, + 632 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Now, let’s bound the last term, ", + "bbox": [ + 174, + 638, + 375, + 654 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/829c9fd4e23bdb278e5ff1227ff383135b5a088a1d6bc15603211a9053d31d45.jpg", + "text": "$$\n\\begin{array} { r } { \\left| 2 \\Big ( \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { \\mathbb { E } } \\big [ x \\otimes x \\big ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { E } \\big [ x \\otimes x \\big ] \\right| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 656, + 836, + 683 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Similar as the first term, we can show that given $\\begin{array} { r } { O ( \\frac { \\Gamma ^ { 1 0 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of samples, we have ", + "bbox": [ + 174, + 686, + 833, + 723 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/d1f4112ea04dfb7f04ad407053d6c0c167188e49ab2b87c88f6d25bede19ae8f.jpg", + "text": "$$\n\\begin{array} { r } { \\mathbb { \\hat { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { \\hat { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { \\hat { E } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { \\hat { E } } \\big [ x \\otimes x \\big ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { E } \\big [ x \\otimes x \\big ] \\Big \\vert \\Big \\vert \\le \\epsilon } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 202, + 723, + 861, + 751 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 753, + 374, + 768 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "Now, we are ready to combine our bound for each of four terms. By union bound, we know given ( Γ14(ΓP1 k+P2)6 log( dδ ) ) number of samples, ", + "bbox": [ + 174, + 775, + 826, + 810 + ], + "page_idx": 26 + }, + { + "type": "equation", + "img_path": "images/e856f2ee40b5c11da5e4aec69fa330b1d3c0fc6540c17f882184095d8f4d11b8.jpg", + "text": "$$\n\\begin{array} { r l } & { | 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) \\cdot ( \\hat { \\mathbb { E } } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] | \\leq \\epsilon , } \\\\ & { | \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\hat { \\mathbb { E } } [ x \\otimes x ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { E } [ x \\otimes x ] | \\Big \\| \\leq \\epsilon , } \\\\ & { | 2 \\Big ( \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { \\mathbb { E } } [ x \\otimes x ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { E } [ x \\otimes x ] \\Big | } \\\\ & { ] 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { \\mathbb { E } } [ x \\otimes x ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { E } [ x \\otimes x ] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 814, + 839, + 929 + ], + "page_idx": 26 + }, + { + "type": "text", + "text": "hold with probability at least $1 - \\delta$ . Thus, we know ", + "bbox": [ + 173, + 103, + 513, + 118 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/4c655f88d3dfb8eb19fc08a54399cf2a097c435375e45432957436231eebc3c9.jpg", + "text": "$$\n\\operatorname* { m a x } _ { u : \\| u \\| \\leq 2 } \\| f ( u ) - \\hat { f } ( u ) \\| \\leq \\epsilon + \\epsilon + \\epsilon + \\epsilon = 4 \\epsilon\n$$", + "text_format": "latex", + "bbox": [ + 348, + 123, + 648, + 151 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ ", + "bbox": [ + 174, + 156, + 374, + 171 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Recall that ", + "bbox": [ + 173, + 178, + 248, + 191 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/7d748518789fe5a4316bf770a1c066023ab2f294f154943bf743d9625f9126c2.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\hat { T } - T \\| _ { F } \\leq \\sqrt { k _ { 2 } + k } \\| \\hat { T } - T \\| } \\\\ & { \\qquad \\leq k \\sqrt { 2 k } \\underset { u : \\| u \\| \\leq 2 } { \\operatorname* { m a x } } \\| f ( u ) - \\hat { f } ( u ) \\| , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 352, + 194, + 643, + 246 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "where the second inequality holds since $\\begin{array} { r } { \\| \\hat { T } - T \\| \\leq \\sqrt { 2 k } \\operatorname* { m a x } _ { u : \\| u \\| \\leq 2 } \\| f ( u ) - \\hat { f } ( u ) \\| . } \\end{array}$ ", + "bbox": [ + 173, + 251, + 741, + 270 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Thus, we know given $\\begin{array} { r } { O ( \\frac { \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of samples, ", + "bbox": [ + 174, + 275, + 622, + 299 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/92de081de9ef7253b0ac2e58a8251ceab920ecc773c9973dc52bc67d43ecbfe1.jpg", + "text": "$$\n\\Vert \\hat { T } - T \\Vert _ { F } \\leq k \\sqrt { 2 k } \\epsilon \\leq d \\sqrt { 2 d } \\epsilon\n$$", + "text_format": "latex", + "bbox": [ + 393, + 304, + 604, + 325 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . Thus, given ( d3Γ14(ΓP1 k+P2)6 log( dδ )4 2 ) number of samples, ", + "bbox": [ + 166, + 329, + 774, + 353 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/83cdbd3683b932eb5f04958d74682172c143b543c973c316dbef9899c75ba4a0.jpg", + "text": "$$\n\\Vert \\hat { T } - T \\Vert _ { F } \\leq \\epsilon\n$$", + "text_format": "latex", + "bbox": [ + 446, + 358, + 550, + 378 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 174, + 382, + 375, + 397 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "B.2 ROBUST ANALYSIS FOR SIMULTANEOUS DIAGONALIZATION ", + "text_level": 1, + "bbox": [ + 174, + 414, + 635, + 429 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "In this section, we will show that the simultaneous diagonalization step in our algorithm is robust. Let $S$ and $\\hat { S }$ be two $( k _ { 2 } + k )$ by $k$ matrices, whose columns consist of the least $k$ right singular vectors of $T$ and $\\hat { T }$ respectively. ", + "bbox": [ + 173, + 439, + 825, + 488 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "According to Lemma 11, we know with polynomial number of samples, the Frobenius norm of $S S ^ { \\top } - \\bar { \\hat { S } } \\hat { S } ^ { \\bot }$ is well bounded. However, due to the rotation issue of subspace basis, we cannot conclude that $\\| S - { \\hat { S } } \\| _ { F }$ is small. Only after appropriate alignment, the difference between $S$ and $\\hat { S }$ becomes small. ", + "bbox": [ + 173, + 493, + 825, + 554 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Lemma 16. Let $S$ and $\\hat { S }$ be two $( k _ { 2 } + k )$ by $k$ matrices, whose columns consist of the least $k$ right singular vectors of $T$ and $\\hat { T }$ respectively. If $\\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } \\leq \\epsilon$ , there exists an rotation matrix $R \\in \\mathbb { R } ^ { k \\times k }$ satisfying $\\boldsymbol { R } \\boldsymbol { R } ^ { \\top } = \\boldsymbol { R } ^ { \\top } \\boldsymbol { R } = \\dot { \\boldsymbol { I } } _ { k }$ , such that ", + "bbox": [ + 173, + 556, + 825, + 603 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/710aa5c59c6f293f04be111c4c745ba7ff0dedfea9c19bff062b131f49f0ccd9.jpg", + "text": "$$\n\\| \\hat { S } - S R \\| _ { F } \\leq 2 \\epsilon .\n$$", + "text_format": "latex", + "bbox": [ + 436, + 607, + 562, + 627 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Proof. Since $S$ has orthonormal columns, we have $\\sigma _ { k } ( S S ^ { \\top } ) = 1$ . Then, according to Lemma 35, we know there exists rotation matrix $R$ such that ", + "bbox": [ + 173, + 638, + 823, + 670 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/79b464797ed4ef43772a285f983db99fd6baf3892fee359d78828f9ec02a2215.jpg", + "text": "$$\n\\| \\hat { S } - S R \\| _ { F } \\leq \\frac { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } { \\sqrt { 2 ( \\sqrt { 2 } - 1 ) } \\sqrt { \\sigma _ { k } ( S S ^ { \\top } ) } } \\leq 2 \\epsilon .\n$$", + "text_format": "latex", + "bbox": [ + 341, + 671, + 655, + 719 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Let the $k$ columns of $S$ be $\\operatorname { v e c } ^ { * } ( U _ { 1 } ) , \\operatorname { v e c } ^ { * } ( U _ { 2 } ) , \\cdot \\cdot \\cdot , \\operatorname { v e c } ^ { * } ( U _ { k } )$ . Note each $U _ { i }$ can be expressed as $A ^ { - \\top } D _ { i } A ^ { - 1 }$ , where $D _ { i }$ is a diagonal matrix. Let $Q$ be a $k \\times k$ matrix, whose $i$ -th column consists of the diagonal elements of $D _ { i }$ , such that $Q _ { i j }$ equals the $j$ -th diagonal element of $D _ { i }$ . Let $\\operatorname { v e c } ^ { * } ( X ) =$ $S R \\zeta _ { 1 } , \\bar { \\mathrm { v e c } } ^ { * } ( Y ) = S R \\zeta _ { 2 }$ , where $R$ is the rotation matrix in Lemma 16 and $\\zeta _ { 1 } , \\zeta _ { 2 }$ are two independent standard Gaussian vectors. Let $D _ { X } = \\mathrm { { d i a g } } ( Q R \\zeta _ { 1 } )$ and $D _ { Y } = \\mathrm { { d i a g } } ( Q R \\zeta _ { 2 } )$ . It’s not hard to check that $X = A ^ { - \\top } D _ { X } A ^ { - 1 }$ and $Y = A ^ { - \\top } D _ { Y } A ^ { - 1 }$ . Furthermore, we have $X Y ^ { - 1 } = A ^ { - \\top } D _ { X } D _ { Y } ^ { - 1 } A ^ { \\top }$ . Next, we show that the diagonal elements of $D _ { X } D _ { Y } ^ { - 1 }$ are well separated. ", + "bbox": [ + 173, + 751, + 826, + 854 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Lemma 17. Assume that $\\| A \\| \\leq P _ { 1 } , \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta$ . Then for any $\\delta > 0$ we know with probability at least $1 - \\delta$ , we have ", + "bbox": [ + 171, + 857, + 823, + 885 + ], + "page_idx": 27 + }, + { + "type": "equation", + "img_path": "images/8aa0a453f43a4b46f775ea99b0dc74c6e9538d899da192239707405352c7bd23.jpg", + "text": "$$\n\\begin{array} { r l } & { \\qquad \\quad s e p ( D _ { X } D _ { Y } ^ { - 1 } ) \\geq p o l y ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) , } \\\\ & { \\qquad s e p ( D _ { X } D _ { Y } ^ { - 1 } ) : = \\operatorname* { m i n } _ { i \\not = j } | ( D _ { X } D _ { Y } ^ { - 1 } ) _ { i i } - ( D _ { X } D _ { Y } ^ { - 1 } ) _ { j j } | . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 217, + 882, + 629, + 924 + ], + "page_idx": 27 + }, + { + "type": "text", + "text": "Proof. We first show that matrix $Q$ is well-conditioned. Since $U _ { i } ~ = ~ A ^ { - \\top } D _ { i } A ^ { - 1 }$ , we have $\\operatorname { v e c } ( { \\mathsf { \\bar { U } } } _ { i } ) = A ^ { - \\top } \\otimes A ^ { - \\top } \\operatorname { v e c } ( D _ { i } )$ . Let $U$ be a $k ^ { 2 } \\times k$ matrix whose columns consist of ${ \\mathrm { v e c } } ( U _ { i } )$ ’s. Also define $\\bar { Q }$ as a $k ^ { 2 } \\times k$ matrix whose columns are $\\mathrm { v e c } ( D _ { i } )$ ’s. Note that matrix $\\bar { Q }$ only has $k$ non-zero rows, which are exactly matrix $Q$ . With the above definition, we have $U = \\bar { A } ^ { - \\top } \\bar { \\otimes } A ^ { - \\top } \\bar { Q }$ . Since $\\sigma _ { \\operatorname* { m i n } } ( U ) \\leq \\lVert A ^ { - \\top } \\otimes \\dot { A } ^ { - \\top } \\rVert \\sigma _ { \\operatorname* { m i n } } ( \\bar { Q } )$ , we have ", + "bbox": [ + 173, + 102, + 826, + 175 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/1e0347445f871cc31972bf137628566ff5ee2951b24e213024ea973dfbd5906b.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( { \\bar { Q } } ) \\geq { \\frac { \\sigma _ { \\operatorname* { m i n } } ( U ) } { \\| A ^ { - \\top } \\otimes A ^ { - \\top } \\| } } .\n$$", + "text_format": "latex", + "bbox": [ + 401, + 181, + 596, + 217 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Notice that a subset of rows of $U$ constitute matrix $S$ , which is an orthonormal matrix. Thus, we have $\\sigma _ { \\operatorname* { m i n } } ( U ) \\geq \\sigma _ { \\operatorname* { m i n } } ( S ) = 1$ . Since we assume $\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta$ , we have ", + "bbox": [ + 171, + 229, + 825, + 260 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/9d3ec2a7c05a229ab4be1cd9cb5c3ad90fbffd8820a3a335ed1be9dc575164ce.jpg", + "text": "$$\n\\| A ^ { - \\top } \\otimes A ^ { - \\top } \\| = \\| A ^ { - \\top } \\| ^ { 2 } = { \\frac { 1 } { \\sigma _ { \\operatorname* { m i n } } ( A ) ^ { 2 } } } \\leq { \\frac { 1 } { \\beta ^ { 2 } } } .\n$$", + "text_format": "latex", + "bbox": [ + 336, + 266, + 660, + 299 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Thus, we have $\\sigma _ { \\mathrm { m i n } } ( \\bar { Q } ) \\geq \\beta ^ { 2 }$ , which implies $\\sigma _ { \\mathrm { m i n } } ( Q ) \\ge \\beta ^ { 2 }$ . ", + "bbox": [ + 173, + 306, + 575, + 324 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "We also know $\\| U \\| \\ge \\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) \\| \\bar { Q } \\|$ , thus ", + "bbox": [ + 173, + 327, + 521, + 345 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/5d3326b39a246d85b0569b3961acaf079c1da93fe5eb3ecb447e858f0ea2c730.jpg", + "text": "$$\n\\lVert \\bar { Q } \\rVert \\leq \\frac { \\lVert U \\rVert } { \\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) } .\n$$", + "text_format": "latex", + "bbox": [ + 401, + 352, + 596, + 386 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Since $\\| S \\| = 1$ , we know $\\| U \\| \\leq { \\sqrt { 2 } }$ . For the smallest singular value of $A ^ { - \\top } \\otimes A ^ { - \\top }$ , we have ", + "bbox": [ + 171, + 395, + 795, + 412 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/dcc8fb3a58ef9821d4d74cd71d6db4c4c7de58a22626bae4a48e306e89246db2.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) = \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) = { \\frac { 1 } { \\| A \\| ^ { 2 } } } \\geq { \\frac { 1 } { P _ { 1 } ^ { 2 } } } .\n$$", + "text_format": "latex", + "bbox": [ + 326, + 417, + 669, + 452 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Thus, we have $\\| \\bar { Q } \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }$ , which implies $\\| Q \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }$ . ", + "bbox": [ + 173, + 459, + 568, + 478 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Now, let’s prove that the diagonal elements of $D _ { X } D _ { Y } ^ { - 1 }$ are well-separated. Let $q _ { i } ^ { \\top }$ be the $i$ -th row vector of $Q$ . Then we know the $i$ -th diagonal element of $D _ { X } D _ { Y } ^ { - 1 }$ is $\\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle }$ . Since $\\| Q \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }$ , we have $\\| q _ { i } \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }$ for every row vector. ", + "bbox": [ + 174, + 483, + 826, + 536 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "It’s not hard to show that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , we have $| \\langle q _ { i } , R \\zeta _ { 2 } \\rangle | ~ \\leq$ $\\mathrm { p o l y } ( d , P _ { 1 } )$ for each $i$ . Now given $\\zeta _ { 2 }$ for which this happens, we have $\\begin{array} { r } { \\frac { \\left. q _ { i } , R \\zeta _ { 1 } \\right. } { \\left. q _ { i } , R \\zeta _ { 2 } \\right. } - \\frac { \\left. q _ { j } , R \\zeta _ { 1 } \\right. } { \\left. q _ { j } , R \\zeta _ { 2 } \\right. } = } \\end{array}$ $c _ { i } \\langle q _ { i } , R \\zeta _ { 1 } \\rangle - c _ { j } \\langle q _ { j } , R \\zeta _ { 1 } \\rangle$ , where $c _ { i } , c _ { j }$ have magnitude as least pol $\\prime ( 1 / d , 1 / P _ { 1 } )$ . Since $\\sigma _ { m i n } ( Q ) \\geq$ $\\beta ^ { 2 }$ , we know $\\| \\mathrm { P r o j } _ { q _ { j } ^ { \\perp } } q _ { i } \\| \\ge \\beta ^ { 2 }$ (because otherwise there exists $\\lambda$ such that $\\| ( e _ { i } + \\lambda e _ { j } ) \\| \\sigma _ { m i n } ( Q ) \\leq$ $\\| ( e _ { i } + \\lambda e _ { j } ) ^ { \\top } Q \\| = \\| \\mathrm { P r o j } _ { q _ { j } ^ { \\bot } } q _ { i } \\| < \\beta ^ { 2 }$ , which is a contradiction). Let $q _ { i , j } ^ { \\perp } = \\mathrm { P r o j } _ { q _ { j } ^ { \\perp } } q _ { i } = q _ { i } - \\lambda _ { i , j } q _ { j }$ , we can rewrite this as ", + "bbox": [ + 173, + 542, + 826, + 646 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/b431a3e41fafddf9ec12649de593e34ac217fb2495a62df0bed20726e31f2070.jpg", + "text": "$$\n\\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle } - \\frac { \\langle q _ { j } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { j } , R \\zeta _ { 2 } \\rangle } = c _ { i } \\langle q _ { i } , R \\zeta _ { 1 } \\rangle - c _ { j } \\langle q _ { j } , R \\zeta _ { 1 } \\rangle = c _ { i } \\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle - ( c _ { j } + \\lambda _ { i , j } c _ { i } ) \\langle q _ { j } , R \\zeta _ { 1 } \\rangle .\n$$", + "text_format": "latex", + "bbox": [ + 192, + 651, + 805, + 685 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "By properties of Gaussians, we know $\\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle$ is independent of $\\langle q _ { j } , R \\zeta _ { 1 } \\rangle$ , so we can first fix $\\langle q _ { j } , R \\zeta _ { 1 } \\rangle$ and apply anti-concentration of Gaussians (see Lemma 38) to $\\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle$ . As a result we know with probability at least $1 - \\delta / k ^ { 2 }$ : ", + "bbox": [ + 173, + 700, + 825, + 751 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/5dca27e7fdef391919d6941ff17ca0674b6c8ab391a8106608ac4a76ff778f32.jpg", + "text": "$$\n\\Big | \\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle } - \\frac { \\langle q _ { j } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { j } , R \\zeta _ { 2 } \\rangle } \\Big | \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) .\n$$", + "text_format": "latex", + "bbox": [ + 333, + 768, + 665, + 803 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "By union bound, we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 813, + 550, + 829 + ], + "page_idx": 28 + }, + { + "type": "equation", + "img_path": "images/45311a4bc15d9ed41ff7fe8277ae7ce01e54c7febdaf9d8167f1482e37deb548.jpg", + "text": "$$\n\\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) .\n$$", + "text_format": "latex", + "bbox": [ + 367, + 835, + 629, + 854 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Let $\\hat { X } \\ = \\ \\hat { S } \\zeta _ { 1 }$ and $\\hat { Y } \\ = \\ \\hat { S } \\zeta _ { 2 }$ . Next, we prove that the eigenvectors of $\\hat { X } \\hat { Y } ^ { - 1 }$ are close to the eigenvectors of $X Y ^ { - 1 }$ . ", + "bbox": [ + 173, + 892, + 825, + 924 + ], + "page_idx": 28 + }, + { + "type": "text", + "text": "Lemma 12. Suppose that $\\begin{array} { r c l } { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } & { \\leq } & { \\epsilon , \\| A \\| } \\\\ & { } & { \\geq } \\end{array} \\leq \\epsilon , \\| A \\| \\ \\leq \\ { P } _ { 1 } , \\| \\xi \\| \\ \\leq \\ P _ { 2 } , \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\ \\geq$ $\\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta .$ . Let $\\hat { X } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 1 } ) , \\hat { Y } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 2 } )$ , where $\\zeta _ { 1 }$ and $\\zeta _ { 2 }$ are two independent standard Gaussian vectors. Let $z _ { 1 } , \\cdots z _ { k }$ be the normalized row vectors of $A ^ { - 1 }$ . Let $\\hat { z } _ { 1 } , . . . , \\hat { z } _ { k }$ be the eigenvectors of $\\hat { X } \\hat { Y } ^ { - 1 }$ (after sign flip). For any $\\delta > 0$ and small enough \u000f, with $O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )$ ) number of i.i.d. samples in $\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]$ , with probability at least $1 - \\delta$ over the randomness of $\\zeta _ { 1 } , \\zeta _ { 2 }$ and i.i.d. samples, there exists a permutation $\\pi ( i ) \\in [ k ]$ such that ", + "bbox": [ + 171, + 99, + 826, + 196 + ], + "page_idx": 29 + }, + { + "type": "equation", + "img_path": "images/8edf9469821371490d668fb39458486c8d129368c06e0780a5e709c12e6cbd5d.jpg", + "text": "$$\n\\begin{array} { r } { \\| \\hat { z } _ { i } - z _ { \\pi [ i ] } \\| \\le p o l y ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 367, + 198, + 625, + 217 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "for any $1 \\leq i \\leq k$ . ", + "bbox": [ + 171, + 215, + 297, + 232 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Proof. Let $z _ { 1 } ^ { \\prime } , \\cdots , z _ { k } ^ { \\prime }$ be the eigenvectors of $X Y ^ { - 1 }$ (before sign flip step). Similarly define $\\hat { z } _ { 1 } ^ { \\prime } , \\cdots , \\hat { z } _ { k } ^ { \\prime }$ for $\\hat { X } \\hat { Y } ^ { - 1 }$ . We first prove that the eigenvectors of $\\hat { X } \\hat { Y } ^ { - 1 }$ are close to the eigenvectors of $X Y ^ { - 1 }$ ", + "bbox": [ + 173, + 244, + 826, + 291 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Let ${ \\hat { X } } = X + E _ { X }$ and $\\hat { Y } = Y + E _ { Y }$ . Then we have ", + "bbox": [ + 173, + 296, + 522, + 313 + ], + "page_idx": 29 + }, + { + "type": "equation", + "img_path": "images/ff9afd0cbe176dd292a1f4f93f272846edc82e1bee593e39eab2867ebd0182cc.jpg", + "text": "$$\n\\hat { X } \\hat { Y } ^ { - 1 } = X Y ^ { - 1 } ( I + F ) + G ,\n$$", + "text_format": "latex", + "bbox": [ + 395, + 313, + 601, + 330 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "where $F = - E _ { Y } ( I + Y ^ { - 1 } E _ { Y } ) ^ { - 1 } Y ^ { - 1 } $ and $G = E _ { X } \\hat { Y } ^ { - 1 }$ . According to Lemma 34, we have $\\begin{array} { r } { \\| \\boldsymbol { F } \\| \\le \\frac { \\| E _ { Y } \\| } { \\sigma _ { \\operatorname* { m i n } } ( Y ) - \\| E _ { Y } \\| } } \\end{array}$ and $\\begin{array} { r } { \\| G \\| \\le \\frac { \\| E _ { X } \\| } { \\sigma _ { \\operatorname* { m i n } } ( \\hat { Y } ) } } \\end{array}$ . In order to bound the perturbation matrices $\\| F \\|$ and $\\| G \\|$ , we need to first bound $\\| E _ { X } \\| , \\| E _ { Y } \\|$ and $\\sigma _ { \\mathrm { m i n } } ( Y ) , \\sigma _ { \\mathrm { m i n } } ( \\hat { Y } )$ . ", + "bbox": [ + 173, + 333, + 826, + 390 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "As we know, $E _ { X } = \\hat { X } - X = ( \\hat { S } - S R ) \\zeta _ { 1 }$ . According to Lemma 16, we have $\\| \\hat { S } - S R \\| \\le$ $\\| \\hat { S } - S R \\| _ { F } \\leq 2 \\epsilon$ . We also know with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , $\\| \\zeta _ { 1 } \\| \\le \\mathsf { p o l y } ( d )$ . Thus, we have ", + "bbox": [ + 173, + 395, + 825, + 441 + ], + "page_idx": 29 + }, + { + "type": "equation", + "img_path": "images/800754763d2678772d02f38d288f3142259a1d14416f12a5ad184e5d2e6cedf2.jpg", + "text": "$$\n\\| E _ { X } \\| = \\| ( \\hat { S } - S R ) \\zeta _ { 1 } \\| \\leq \\| \\hat { S } - S R \\| \\| \\zeta _ { 1 } \\| \\leq \\mathrm { p o l y } ( \\epsilon , d ) .\n$$", + "text_format": "latex", + "bbox": [ + 310, + 441, + 686, + 462 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Similarly, with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , we also know $\\| E _ { Y } \\| \\le \\mathtt { p o l y } ( \\epsilon , d )$ ", + "bbox": [ + 181, + 463, + 736, + 481 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Now, we lower bound the smallest singular value of $X$ and $Y$ . Since $X = A ^ { - \\top } D _ { X } A ^ { - 1 }$ , we have ", + "bbox": [ + 176, + 486, + 812, + 501 + ], + "page_idx": 29 + }, + { + "type": "equation", + "img_path": "images/8c3ed5431b1b8a04aea5cae323b859ab4901cfe4a27f99d96ae1817430e22fde.jpg", + "text": "$$\n\\begin{array} { r l } & { { \\sigma } _ { \\operatorname* { m i n } } ( X ) \\geq { \\sigma } _ { \\operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) } \\\\ & { \\qquad = \\displaystyle \\frac { 1 } { \\| A \\| ^ { 2 } } { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) } \\\\ & { \\qquad \\geq \\displaystyle \\frac { 1 } { P _ { 1 } ^ { 2 } } { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 385, + 501, + 612, + 588 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Since $D _ { X }$ is a diagonal matrix, its smallest singular value equals the smallest absolute value of its diagonal element. Recall each diagonal element of $D _ { X }$ is $\\langle q _ { i } , R \\zeta _ { 1 } \\rangle$ , which follows a Gaussian distribution whose standard deviation is at least $\\left\\| q _ { i } \\right\\| \\ge \\beta ^ { 2 }$ . By anti-concentration property of Gaussian (see Lemma 38), we know $| \\langle q _ { i } , R \\zeta _ { 2 } \\rangle | \\ge \\Omega ( \\delta \\beta ^ { 2 } / k )$ for all $i$ with probability $\\bar { 1 } - \\bar { \\delta } / 4$ . Thus, we have $\\sigma _ { \\operatorname* { m i n } } ( X ) \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )$ . Similarly we have the same conclusion for $Y$ . For small enough $E _ { Y }$ , we have $\\sigma _ { \\operatorname* { m i n } } ( \\hat { Y } ) \\geq \\sigma _ { \\operatorname* { m i n } } ( Y ) - \\| E _ { Y } \\|$ . ", + "bbox": [ + 173, + 588, + 826, + 676 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Thus, for small enough $\\epsilon$ , we have $\\begin{array} { r l r } { \\| { \\cal F } \\| } & { { } \\le } & { \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) _ { . } } \\end{array}$ and $\\| G \\| \\quad \\leq$ $\\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta )$ . In order to apply Lemma 33, we also need to bound $\\kappa ( \\boldsymbol { A } ^ { - \\top } )$ and $\\| X Y ^ { - 1 } \\|$ . Since $\\textstyle \\sigma _ { \\operatorname* { m i n } } ( { \\dot { A } } ^ { - \\top } ) \\geq { \\frac { 1 } { P _ { 1 } } }$ and $\\| A ^ { - \\top } \\| \\leq 1 / \\beta$ , we have $\\kappa ( A ^ { - \\top } ) \\leq P _ { 1 } / \\beta$ . For the norm of $X Y ^ { - 1 }$ we have ", + "bbox": [ + 173, + 680, + 826, + 738 + ], + "page_idx": 29 + }, + { + "type": "equation", + "img_path": "images/4cda29ce5aa9c611e198d390f8a061031842c8bb4689519b97b8f09ab1db3406.jpg", + "text": "$$\n\\lVert X Y ^ { - 1 } \\rVert \\leq \\frac { \\lVert X \\rVert } { \\sigma _ { \\operatorname* { m i n } } ( Y ) } \\leq \\lVert X \\rVert \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta ) ,\n$$", + "text_format": "latex", + "bbox": [ + 325, + 738, + 671, + 772 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "where the second inequality holds because $\\sigma _ { \\operatorname* { m i n } } ( Y ) \\geq \\mathrm { { p o l y } } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )$ . Recall that $X =$ $\\mathrm { m a t } ^ { * } ( S R \\zeta _ { 1 } )$ . It’s not hard to verify that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , we have $\\| X \\| \\leq$ poly $( d )$ . Thus, we know $\\| X Y ^ { - \\bar { 1 } } \\| \\le \\mathrm { p o l y } \\bar { ( } d , P _ { 1 } , 1 / \\bar { \\beta } , 1 / \\delta )$ . Similarly, we can also prove that $\\| D _ { X } D _ { Y } ^ { - 1 } \\| \\le \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta )$ ", + "bbox": [ + 173, + 773, + 826, + 835 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "Overall, we have ", + "bbox": [ + 173, + 840, + 287, + 854 + ], + "page_idx": 29 + }, + { + "type": "equation", + "img_path": "images/ba1d1ee8542e46b1dcb5d2dc74261c2585b11c04103a5a5e78e42fd5d94ac6c2.jpg", + "text": "$$\n\\begin{array} { r l } { \\mathfrak { s } ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } F \\| + \\| G \\| ) \\le \\kappa ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } \\| \\| F \\| + \\| G \\| ) } & { } \\\\ & { \\le \\frac { P _ { 1 } } { \\beta } \\Big ( \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta ) \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) + \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) } \\\\ & { \\le \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 852, + 839, + 928 + ], + "page_idx": 29 + }, + { + "type": "text", + "text": "According to Lemma 17, we know with probability at least $1 \\mathrm { ~ - ~ } \\delta / 4$ , $\\begin{array} { r l } { \\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) } & { { } \\geq } \\end{array}$ $\\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )$ . Thus, by union bound, we know for small enough $\\epsilon$ , with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 102, + 825, + 145 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/d6513cc3b9086b2fe69091a81029b8fe010ad6d598f5108489d824332b35a38c.jpg", + "text": "$$\n\\kappa ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } F \\| + \\| G \\| ) < \\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) / ( 2 k ) .\n$$", + "text_format": "latex", + "bbox": [ + 323, + 142, + 673, + 161 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "According to Lemma 33, we know there exists a permutation $\\pi [ i ] \\in [ k ]$ , such that ", + "bbox": [ + 179, + 164, + 702, + 180 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/f2da000ad40eebd0026421536d6c3abf59741b84dddf98849a6ce678a72fb9b1.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\hat { z } _ { i } ^ { \\prime } - z _ { i } ^ { \\prime } \\| \\leq 3 \\frac { \\| F \\| \\| D _ { X } D _ { Y } ^ { - 1 } \\| + \\| G \\| } { \\sigma _ { \\operatorname* { m i n } } \\left( A ^ { - \\top } \\right) \\operatorname { s e p } \\left( D _ { X } D _ { Y } ^ { - 1 } \\right) } } \\\\ & { \\qquad \\leq 3 \\frac { \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta \\right) \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , 1 / \\delta \\right) + \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta \\right) } { 1 / P _ { 1 } \\mathrm { p o l y } \\left( 1 / d , 1 / P _ { 1 } , \\beta , 1 / \\delta \\right) } } \\\\ & { \\qquad \\leq \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 215, + 185, + 782, + 277 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ ", + "bbox": [ + 173, + 282, + 374, + 297 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "According to Lemma 5, the eigenvectors of $X Y ^ { - 1 }$ (after sign flip) are exactly the normalized rows of $A ^ { - 1 }$ (up to permutation). Now the only issue is the sign of $\\hat { z } _ { i } ^ { \\prime }$ . By the robustness of sign flip step (see Lemma 18), we know for small enough $\\epsilon$ , with $O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )$ number of i.i.d. samples in $\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]$ , with probability at least $1 - \\delta$ , the sign flip of $\\hat { z } _ { i } ^ { \\prime }$ is consistent with the sign flip of $z _ { i } ^ { \\prime }$ . □ ", + "bbox": [ + 173, + 303, + 826, + 385 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "In the following lemma, we show that the sign flip step of $\\hat { z } _ { i }$ is robust. ", + "bbox": [ + 173, + 398, + 632, + 415 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "Lemma 18. Suppose that $\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }$ . Let $z _ { 1 } ^ { \\prime } , \\cdots , z _ { k } ^ { \\prime }$ be the eigenvectors of $X Y ^ { - 1 }$ (before sign flip step). Similarly define $\\hat { z } _ { 1 } ^ { \\prime } , \\cdots , \\hat { z } _ { k } ^ { \\prime }$ for $\\hat { X } \\hat { Y } ^ { - 1 }$ . Suppose for each i, $\\| z _ { i } ^ { \\prime } { - } \\hat { z } _ { i } ^ { \\prime } \\| \\leq$ \u000f, where $\\begin{array} { r } { \\epsilon \\le \\frac { \\beta \\gamma } { 4 \\Gamma \\left( 1 + \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } \\right) } } \\end{array}$ . We know, for any $\\delta < 1$ , with $O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )$ number of i.i.d. samples, ", + "bbox": [ + 173, + 417, + 828, + 486 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/f9b54686ad52d30c9d1adf97b49d7bc05d04417afaf39d12bd8cceaeceede0b2.jpg", + "text": "$$\n\\operatorname* { P r } \\left[ s i g n ( \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] ) \\neq s i g n ( \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ) \\right] \\leq \\delta .\n$$", + "text_format": "latex", + "bbox": [ + 349, + 484, + 647, + 512 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "Proof. We first show that $\\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ]$ is bounded away from zero. Let $Z ^ { \\prime }$ be a $k \\times k$ matrix, whose rows are $\\{ z _ { i } ^ { \\prime } \\}$ . Without loss of generality, assume that $Z ^ { \\prime } = \\mathrm { d i a g } ( \\pm \\lambda ) A ^ { - 1 }$ . Since $\\| A ^ { - 1 } \\| \\le 1 / \\beta$ , we know $\\lambda _ { i } \\geq \\beta$ , for each $i$ . Thus, we have ", + "bbox": [ + 173, + 526, + 826, + 569 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/cff95dd7daf54bf175fd2a58a03a385e7581c4a58de9064c1d9e7dafc041ef08.jpg", + "text": "$$\n\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | = \\lambda _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ] \\geq \\beta \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 349, + 574, + 647, + 593 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "In order to lowerbound $\\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]$ , let’s first look at $\\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) x ^ { \\top } ]$ . ", + "bbox": [ + 173, + 601, + 622, + 618 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/073b7fbd80663b5a8f952b05331da0c247069c6a2f76479a4d0f970c681fea2a.jpg", + "text": "$$\n\\begin{array} { r l } { \\| \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) x ^ { \\top } ] \\| } & { = \\displaystyle \\frac { 1 } { 2 } \\| \\mathbb { E } [ w _ { i } ^ { \\top } x x ^ { \\top } ] \\| } \\\\ & { \\qquad \\geq \\displaystyle \\frac { 1 } { 2 } \\| w _ { i } \\| \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) } \\\\ & { \\qquad \\geq \\displaystyle \\frac { \\gamma } { 2 } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 362, + 623, + 635, + 713 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "Now, let’s connect $\\| \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) x ^ { \\top } ] \\|$ with $\\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]$ . ", + "bbox": [ + 173, + 718, + 529, + 736 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/7738d3458d2513c4c34dfe941079ee5ddfb8b6dda2278c9ea5391187897823c7.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\mathbb { E } [ \\sigma ( \\boldsymbol { w } _ { i } ^ { \\top } \\boldsymbol { x } ) \\boldsymbol { x } ^ { \\top } ] \\| \\le \\mathbb { E } [ \\| \\sigma ( \\boldsymbol { w } _ { i } ^ { \\top } \\boldsymbol { x } ) \\boldsymbol { x } ^ { \\top } \\| ] } \\\\ & { ~ = \\mathbb { E } [ \\sigma ( \\boldsymbol { w } _ { i } ^ { \\top } \\boldsymbol { x } ) \\| \\boldsymbol { x } \\| ] } \\\\ & { ~ \\le \\Gamma \\mathbb { E } [ \\sigma ( \\boldsymbol { w } _ { i } ^ { \\top } \\boldsymbol { x } ) ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 375, + 741, + 620, + 804 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "Thus, we have $\\begin{array} { r } { \\mathbb E [ \\sigma ( w _ { i } ^ { \\top } x ) ] \\ge \\frac { \\gamma } { 2 \\Gamma } } \\end{array}$ , and further $\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | \\ge \\frac { \\beta \\gamma } { 2 \\Gamma } } \\end{array}$ . ", + "bbox": [ + 173, + 810, + 589, + 829 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "Now, let’s bound $\\| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\|$ . ", + "bbox": [ + 173, + 835, + 455, + 853 + ], + "page_idx": 30 + }, + { + "type": "equation", + "img_path": "images/d9cf8412c867588368b7c4d49389c594b62f6c56a5a049ad9b8605721b10c74f.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| = \\| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] + \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| } \\\\ & { \\qquad \\leq \\| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } - \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| + \\| \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| } \\\\ & { \\qquad \\leq ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\epsilon + \\| \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 246, + 858, + 748, + 924 + ], + "page_idx": 30 + }, + { + "type": "text", + "text": "Note that we reserve fresh samples for this step, thus $\\hat { z } _ { i } ^ { \\prime }$ is independent with samples in $\\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] $ . Since $\\| \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle \\| \\le \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 }$ , we know with $O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )$ i number of samples, we have ", + "bbox": [ + 173, + 102, + 826, + 150 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/f54d30822e91602a4f37abb5a7ed27529c0b77e1c65ec60b54a8f5ed4bb6e518.jpg", + "text": "$$\n\\begin{array} { r } { \\| \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ] \\| \\leq \\epsilon . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 398, + 150, + 598, + 170 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "Overall, we have $| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ] | \\leq ( 1 + \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\epsilon$ . Combined with the fact that $\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | \\ge \\frac { \\beta \\gamma } { 2 \\Gamma } } \\end{array}$ , we know as long as ≤ βγ4Γ(1+ΓP1√k+P2) , with O( (ΓP1√k+P2)2 log(d/δ)\u000f2 ) number of samples, we have ", + "bbox": [ + 173, + 175, + 826, + 229 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/dd5447c57754b4f8428e24a30f372a7df9a5a16c9ae7fd2522f33a706ebcbf2e.jpg", + "text": "$$\n\\operatorname* { P r } [ \\operatorname { s i g n } ( \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] ) \\neq \\operatorname { s i g n } ( \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ) ] \\leq \\delta .\n$$", + "text_format": "latex", + "bbox": [ + 354, + 229, + 642, + 250 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "B.3 ROBUST ANALYSIS FOR RECOVERING FIRST LAYER WEIGHTS ", + "text_level": 1, + "bbox": [ + 173, + 287, + 650, + 304 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "We will first show that Algorithm 1 is robust. ", + "bbox": [ + 174, + 314, + 470, + 330 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "Theorem 8. Assume that $\\| x \\| \\leq \\Gamma , \\| w \\| \\leq 1 , | \\xi | \\leq P _ { 2 }$ and $\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma .$ . Then for any $\\epsilon \\leq \\gamma / 2$ , for any $1 > \\delta > 0$ , given $\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of i.i.d. samples, we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 333, + 826, + 385 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/61739555d0c64d324f6d4bf83880414036bb29d8c6523d02fd3e31e0e9598710.jpg", + "text": "$$\n\\| \\hat { w } - w \\| \\leq \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 450, + 386, + 545, + 404 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "where $\\hat { w }$ is the learned weight vector. ", + "bbox": [ + 174, + 409, + 419, + 424 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "Proof. We first show that given polynomial number of i.i.d. samples, $\\| \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] \\|$ is upper bounded with high probability, where ${ \\hat { \\mathbb { E } } } [ y x ]$ is the empirical estimate of $\\mathbb { E } [ y x ]$ . Due to the assumption that $\\| x \\| \\leq \\bar { \\Gamma } , \\| w \\| \\leq 1 , \\| \\xi \\| \\leq P _ { 2 }$ , we have ", + "bbox": [ + 173, + 445, + 826, + 492 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/aa8400c59e9d47118b8ad97748f17cf78d5ac812c857dba4d5a26274725cd57f.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| y x \\| = \\| ( \\sigma ( w ^ { \\top } x ) + \\xi ) x \\| } \\\\ & { \\qquad \\leq \\| w ^ { \\top } x x \\| + \\| \\xi x \\| } \\\\ & { \\qquad \\leq \\| w \\| \\| x \\| ^ { 2 } + | \\xi | \\| x \\| } \\\\ & { \\qquad \\leq \\Gamma ^ { 2 } + P _ { 2 } \\Gamma } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 408, + 500, + 588, + 582 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "According to Lemma 24, we know given ( (Γ2+P2Γ)2 log( dδ )\u000f2 ) number of samples, with probability at least $1 - \\delta$ , we have $\\| \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] \\| \\le \\epsilon$ . ", + "bbox": [ + 174, + 589, + 821, + 628 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "Since $\\| x x ^ { \\top } \\| \\leq \\Gamma ^ { 2 }$ , we know that given $O \\big ( \\frac { \\Gamma ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } \\big )$ number of samples, $\\| \\hat { \\mathbb { E } } [ x x ^ { \\top } ] - \\mathbb { E } [ x x ^ { \\top } ] \\| \\leq \\epsilon$ with probability at least $1 - \\delta$ . Suppose that $\\epsilon \\leq \\gamma / 2 \\leq \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) / 2$ , we know $\\hat { \\mathbb { E } } [ x x ^ { \\top } ]$ has full rank. According to Lemma 29, we have ", + "bbox": [ + 174, + 633, + 825, + 685 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/22f21c682d811be3bfc52403d404999a907c0c4ae0fce6d493e9b8c0fc5d4e54.jpg", + "text": "$$\n\\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\right\\| \\leq 2 \\sqrt { 2 } \\frac { \\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\right\\| } { \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( \\mathbb { E } [ x x ^ { \\top } ] ) } \\leq 2 \\sqrt { 2 } \\epsilon / \\gamma ^ { 2 } ,\n$$", + "text_format": "latex", + "bbox": [ + 259, + 694, + 735, + 731 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "with probability at least $1 - \\delta$ . ", + "bbox": [ + 173, + 739, + 375, + 755 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "By union bound, probability at least ow for any , we have $\\epsilon \\leq \\gamma / 2$ , given $O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 2 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )$ number of samples, with $1 - \\delta$ ", + "bbox": [ + 173, + 760, + 823, + 795 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/665e350215faba44577ff370056741f90f6798312ab235d0bce86ce401045190.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\| \\le 2 \\sqrt { 2 } \\epsilon / \\gamma ^ { 2 } } \\\\ & { \\| \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] \\| \\le \\epsilon } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 369, + 801, + 627, + 845 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "Denote ", + "bbox": [ + 173, + 859, + 223, + 875 + ], + "page_idx": 31 + }, + { + "type": "equation", + "img_path": "images/aa0dd2ea2c587d7670e09e42775e665a651edebf080c79322e28f0d2bf1e60cf.jpg", + "text": "$$\n\\begin{array} { r l } & { E _ { 1 } : = \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } } \\\\ & { E _ { 2 } : = \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 400, + 880, + 598, + 922 + ], + "page_idx": 31 + }, + { + "type": "text", + "text": "Then, we have ", + "bbox": [ + 174, + 103, + 272, + 118 + ], + "page_idx": 32 + }, + { + "type": "equation", + "img_path": "images/d43302999e5957a981a8601b9d8ccd1cb44e723a3e569b832fbd065611d3b0df.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\hat { w } - w \\| = 2 \\| \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ y x ] \\| } \\\\ & { \\qquad \\leq 2 \\| E _ { 1 } \\| \\| E _ { 2 } \\| + 2 \\| E _ { 1 } \\| \\| \\mathbb { E } [ y x ] \\| + 2 \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\| \\| E _ { 2 } \\| } \\\\ & { \\qquad \\leq \\frac { 4 \\sqrt { 2 } \\epsilon ^ { 2 } } { \\gamma ^ { 2 } } + \\frac { 4 \\sqrt { 2 } \\left( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma \\right) \\epsilon } { \\gamma ^ { 2 } } + \\frac { 2 \\epsilon } { \\gamma } } \\\\ & { \\qquad \\leq O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) \\epsilon } { \\gamma ^ { 2 } } ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 284, + 121, + 712, + 234 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "Thus, given $\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of samples, with probability at least $1 - \\delta$ , we have ", + "bbox": [ + 166, + 239, + 782, + 262 + ], + "page_idx": 32 + }, + { + "type": "equation", + "img_path": "images/ce4e156b04c2b1276da691d7f0e61370f395a4cdab5883f1eb03d4026ad6ca4e.jpg", + "text": "$$\n\\| { \\hat { w } } - w \\| \\leq \\epsilon .\n$$", + "text_format": "latex", + "bbox": [ + 449, + 267, + 547, + 286 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "Now let’s go back to the call to Algorithm 1 in Algorithm 3. Let $z _ { i }$ ’s be the normalized rows of $A ^ { - 1 }$ , and let $\\hat { z } _ { i }$ ’s be the eigenvectors of $\\hat { X } \\hat { Y } ^ { - 1 }$ (with correct sign). From Lemma 12, we know $\\left\\{ \\hat { z } _ { i } \\right\\}$ are close to $\\left\\{ z _ { i } \\right\\}$ with permutation. Without loss of generality, we assume the permutation here is just an identity mapping, which means $\\| z _ { i } - \\hat { z } _ { i } \\|$ is small for each $i$ . ", + "bbox": [ + 173, + 320, + 825, + 381 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "For each $z _ { i }$ , let $v _ { i }$ be the output of Algorithm 1 given infinite number of inputs $( x , z _ { i } ^ { \\top } y )$ . For each $\\hat { z } _ { i }$ , let $\\hat { v } _ { i }$ be the output of Algorithm 1 given only finite number of samples $( x , \\hat { z } _ { i } ^ { \\top } y )$ . In this section, we show that suppose $\\| z _ { i } - \\hat { z } _ { i } \\|$ is bounded, with polynomial number of samples, $\\Vert { v } _ { i } - \\hat { v } _ { i } \\Vert$ is also bounded. ", + "bbox": [ + 173, + 386, + 825, + 444 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "The input for Algorithm 1 is $( x , \\hat { z } _ { i } ^ { \\top } y )$ . We view $\\hat { z } _ { i } ^ { \\top } y$ as the summation of $z _ { i } ^ { \\top } y$ and a noise term $\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y$ . Here, the issue is that the noise term $\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y$ is not independent with the sample $( x , \\hat { z } _ { i } ^ { \\top } y )$ , which makes the robust analysis in Theorem 8 not applicable. On the other hand, since we reserve a separate set of samples for Algorithm 1, the estimate $\\hat { z } _ { i }$ is independent with the samples $( x , y )$ ’s used by Algorithm 1. Thus, the samples $( x , \\hat { z _ { i } } ^ { \\top } y )$ ’s here are still i.i.d., which enables us to use matrix concentration bounds to show the robustness here. ", + "bbox": [ + 173, + 448, + 825, + 537 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "Lemma 13. Assume that $\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }$ and $\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma$ . Suppose that for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any \u000f ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ4\u000f2 ) number of samples for Algorithm $^ { l }$ , we know with probability at least $1 - \\delta$ , ", + "bbox": [ + 171, + 540, + 825, + 592 + ], + "page_idx": 32 + }, + { + "type": "equation", + "img_path": "images/bf78139a12b5f94ea68282341113f8a58bbc6c37b9378d4b1f882999543260a7.jpg", + "text": "$$\n\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 369, + 597, + 627, + 633 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "for each $1 \\leq i \\leq k$ . ", + "bbox": [ + 173, + 637, + 303, + 654 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "Proof. For any $i$ , let’s bound $\\| v _ { i } \\ - \\hat { v } _ { i } \\|$ . As we know, $\\begin{array} { r } { \\boldsymbol { v } _ { i } ~ = ~ 2 { \\mathbb E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } { \\mathbb E } [ z _ { i } ^ { \\top } \\boldsymbol { y } \\boldsymbol { x } ] } \\end{array}$ and $\\begin{array} { r l } { \\hat { v } _ { i } } & { { } = } \\end{array}$ $2 \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ]$ . Thus, in order to bound $\\Vert { v } _ { i } - \\hat { v } _ { i } \\Vert$ , we only need to show ", + "bbox": [ + 174, + 666, + 823, + 700 + ], + "page_idx": 32 + }, + { + "type": "equation", + "img_path": "images/221b2ef716a42f07c351281fc9e247af72721a45dd89b69c1a7818a4e568a38e.jpg", + "text": "$$\n\\left| \\left| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ z _ { i } ^ { \\top } y x ] \\right| \\right| \\mathrm { ~ a n d ~ } \\left| \\left| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ] \\right| \\right|\n$$", + "text_format": "latex", + "bbox": [ + 194, + 705, + 803, + 727 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "are both bounded. ", + "bbox": [ + 173, + 731, + 294, + 746 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "The first term can be bounded as follows. ", + "bbox": [ + 176, + 752, + 444, + 767 + ], + "page_idx": 32 + }, + { + "type": "equation", + "img_path": "images/67ba24a6c25a8bb15b8c41729c8f2e249fdea2394c75fa8e074ef724eb8c4447.jpg", + "text": "$$\n\\begin{array} { r l } { \\left\\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ z _ { i } ^ { \\top } y x ] \\right\\| } & { = \\left\\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ ( \\hat { z } _ { i } - z _ { i } ) ^ { \\top } y x ] \\right\\| } \\\\ & { \\leq \\left\\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\right\\| \\left\\| \\hat { z } _ { i } - z _ { i } \\right\\| \\left\\| A \\sigma ( W x ) + \\xi \\right\\| \\left\\| x \\right\\| } \\\\ & { \\leq \\frac { \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 200, + 768, + 795, + 851 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "We can use standard matrix concentration bounds to upper bound the second term. By similar analysis of Theorem 1, we know given $\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of i.i.d. samples, with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 859, + 825, + 909 + ], + "page_idx": 32 + }, + { + "type": "equation", + "img_path": "images/fc077f031385442a0238cf2ebde1edf67a7bd2b1ee6d4e143d241d3ad31e7f73.jpg", + "text": "$$\n\\begin{array} { r } { \\big \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ] \\big \\| \\leq \\epsilon . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 338, + 905, + 660, + 926 + ], + "page_idx": 32 + }, + { + "type": "text", + "text": "Overall, we have ", + "bbox": [ + 173, + 103, + 287, + 117 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/43f695561b10bc6c82c98e00fc61fb991addf9893f6db7880b99b1964c68d867.jpg", + "text": "$$\n\\begin{array} { r l } & { v _ { i } - \\hat { v } _ { i } \\| = \\left\\| 2 \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ z _ { i } ^ { \\top } y x ] - 2 \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ] \\right\\| } \\\\ & { \\qquad \\leq 2 \\big \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ z _ { i } ^ { \\top } y x ] \\big \\| + 2 \\big \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ] } \\\\ & { \\qquad \\leq \\frac { 2 \\tau \\big ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } \\big ) \\Gamma } { \\gamma } + 2 \\epsilon . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 116, + 839, + 199 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "By union bound, we know given $\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}$ number of i.i.d. samples, with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 205, + 825, + 241 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/05380715fb70e4936cc5d86cc99ef587262bf2f6f7179e4bfdab12b9c6334ed7.jpg", + "text": "$$\n\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon .\n$$", + "text_format": "latex", + "bbox": [ + 369, + 237, + 629, + 275 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "for any $1 \\leq i \\leq k$ . ", + "bbox": [ + 173, + 272, + 297, + 287 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "B.4 PROOF OF THEOREM 7 ", + "text_level": 1, + "bbox": [ + 174, + 303, + 375, + 318 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "Proof of Theorem 7. Combining Lemma 11, Lemma 12 and Lemma 13, we know given p $\\mathrm { o l y } \\big ( \\Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \\epsilon , 1 / \\gamma , 1 / \\alpha , 1 / \\bar { \\beta } , 1 / \\delta \\big )$ number of i.i.d. samples, with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 332, + 823, + 361 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/67ca360aadb97c6df6c4045112db4a29eb5f27008bab759f8a0ceb0fd2454753.jpg", + "text": "$$\n\\| z _ { i } - \\hat { z } _ { i } \\| \\leq \\epsilon , \\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\epsilon\n$$", + "text_format": "latex", + "bbox": [ + 401, + 363, + 596, + 381 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "for each $1 \\leq i \\leq k$ . ", + "bbox": [ + 173, + 382, + 303, + 397 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "Let $V$ be a $k \\times d$ matrix whose rows are $v _ { i }$ ’s. Similarly define matrix $\\hat { V }$ for $\\hat { v } _ { i }$ ’s. Since $\\lVert { v } _ { i } - \\hat { v } _ { i } \\rVert \\leq \\epsilon$ for any $i$ , we know every row vector of $V - { \\hat { V } }$ has norm at most $\\epsilon$ , which implies $\\| V - \\hat { V } \\| \\leq \\sqrt { k } \\epsilon$ . ", + "bbox": [ + 171, + 402, + 825, + 435 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "Let $Z$ be a $k \\times k$ matrix whose rows are $z _ { i }$ ’s. Similarly define matrix $\\hat { Z }$ for $\\hat { z } _ { i }$ ’s. Again, we have $\\| Z - \\hat { Z } \\| \\leq \\sqrt { k } \\epsilon$ . In order to show $\\lVert Z ^ { - 1 } - \\hat { Z } ^ { - 1 } \\rVert$ is small using standard matrix perturbation bounds (Lemma 29), we need to lower bound $\\sigma _ { \\mathrm { m i n } } ( Z )$ . Notice that $Z$ is just matrix $A ^ { - 1 }$ with normalized row vectors. As we know, $\\sigma _ { \\mathrm { m i n } } ( A ^ { - 1 } ) \\ge 1 / \\dot { P _ { 1 } }$ , and $\\| A ^ { - 1 } \\| \\le 1 \\mathsf { \\bar { / } } \\beta$ , which implies that every row vector of $A ^ { - 1 }$ has norm at most $1 / \\beta$ . Let $D _ { z }$ be the diagonal matrix whose $i$ , $i$ -th entry is the norm of $i$ -th row of $A ^ { - 1 }$ , then $Z = D _ { z } ^ { - 1 } A ^ { - 1 }$ , and we know $\\bar { \\sigma _ { m i n } } ( Z ) \\geq \\sigma _ { m i n } ( D _ { z } ^ { - 1 } ) \\sigma _ { m i n } ( \\bar { A ^ { - 1 } } ) \\geq \\beta / P _ { 1 }$ . ", + "bbox": [ + 173, + 443, + 825, + 531 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "Then, according to Lemma 29, as long as $\\begin{array} { r } { \\epsilon \\le \\frac { \\beta } { 2 P _ { 1 } } } \\end{array}$ , we have ", + "bbox": [ + 173, + 536, + 565, + 555 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/2d24743a51b1434f6a5e21e975bbba8fa89df78f5bde2ef3385c435ce3c3dbd4.jpg", + "text": "$$\n\\| Z ^ { - 1 } - \\hat { Z } ^ { - 1 } \\| \\leq 2 \\sqrt { 2 } \\frac { \\| Z - \\hat { Z } \\| } { \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( Z ) } \\leq 2 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\sqrt { k } \\epsilon / \\beta ^ { 2 } .\n$$", + "text_format": "latex", + "bbox": [ + 325, + 558, + 671, + 594 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "Define ", + "bbox": [ + 173, + 603, + 220, + 617 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/7c48554ec6dd87a61f33c2bc1bc57ffa8c631ba2f0aa778c0d795430d250abf1.jpg", + "text": "$$\n\\begin{array} { l } { E _ { 1 } : = Z ^ { - 1 } - \\hat { Z } ^ { - 1 } } \\\\ { E _ { 2 } : = V - \\hat { V } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 434, + 617, + 562, + 657 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "We know $\\| E _ { 1 } \\| \\le 2 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\sqrt { k } \\epsilon / \\beta ^ { 2 }$ and $\\| E _ { 2 } \\| \\le \\sqrt { k } \\epsilon$ . In order to bound $\\| V \\|$ , we can bound the norm of its row vectors. We have, ", + "bbox": [ + 174, + 660, + 820, + 690 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/4b901d099ef4023339d5d1b47deba42dfdf7a6ace5d4c205846dc09288779be8.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| v _ { i } \\| = \\| 2 \\mathbb E [ x x ^ { \\top } ] ^ { - 1 } \\mathbb E [ z _ { i } ^ { \\top } y x ] \\| } \\\\ & { ~ \\leq \\frac { 2 \\Gamma ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) } { \\gamma } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 398, + 689, + 598, + 747 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "which implies $\\begin{array} { r } { \\| V \\| \\le \\frac { 2 \\sqrt { k } \\Gamma ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) } { \\gamma } } \\end{array}$ . Now we can bound $\\| Z ^ { - 1 } \\sigma ( V x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\|$ as follows. ", + "bbox": [ + 176, + 750, + 823, + 771 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/f5a7eb72e883c0a07e1bd095b7f258af127358df108cd8c19899de2180ccb015.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| Z ^ { - 1 } \\sigma ( V x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\| \\le \\| E _ { 1 } \\| \\| E _ { 2 } x \\| + \\| E _ { 1 } \\| \\| V x \\| + \\| Z ^ { - 1 } \\| \\| E _ { 2 } x \\| } \\\\ & { \\qquad \\le \\frac { 2 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\Gamma k \\epsilon ^ { 2 } } { \\beta ^ { 2 } } + \\frac { 4 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\Gamma ^ { 2 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) k \\epsilon } { \\beta ^ { 2 } \\gamma } + \\frac { P _ { 1 } \\Gamma \\sqrt { k } \\epsilon } { \\beta } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 205, + 772, + 790, + 830 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "where the first inequality holds since $\\| \\sigma ( V x ) \\| \\leq \\| V x \\|$ and $\\| \\sigma ( { \\hat { V } } x ) - \\sigma ( V x ) \\| \\leq \\| { \\hat { V } } x - V x \\| .$ ", + "bbox": [ + 171, + 833, + 805, + 851 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "Thus, we know given poly $\\left( \\Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \\epsilon , 1 / \\gamma , 1 / \\alpha , 1 / \\beta , 1 / \\delta \\right)$ number of i.i.d. samples, with probability at least $1 - \\delta$ , ", + "bbox": [ + 173, + 854, + 825, + 885 + ], + "page_idx": 33 + }, + { + "type": "equation", + "img_path": "images/91a549cb91a84ebe2cde811461ad72c22ddd9e298d281bab8300fce7666dff7f.jpg", + "text": "$$\n\\lVert A \\boldsymbol { \\sigma } ( W \\boldsymbol { x } ) - \\hat { Z } ^ { - 1 } \\boldsymbol { \\sigma } ( \\hat { V } \\boldsymbol { x } ) \\rVert = \\lVert Z ^ { - 1 } \\boldsymbol { \\sigma } ( V \\boldsymbol { x } ) - \\hat { Z } ^ { - 1 } \\boldsymbol { \\sigma } ( \\hat { V } \\boldsymbol { x } ) \\rVert \\leq \\epsilon ,\n$$", + "text_format": "latex", + "bbox": [ + 290, + 887, + 707, + 906 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "where the first equality holds because $A \\sigma ( W x ) = Z ^ { - 1 } \\sigma ( V x )$ , as shown in Theorem 5. ", + "bbox": [ + 169, + 909, + 748, + 924 + ], + "page_idx": 33 + }, + { + "type": "text", + "text": "C SMOOTHED ANALYSIS FOR DISTINGUISHING MATRICES ", + "text_level": 1, + "bbox": [ + 173, + 102, + 676, + 118 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "In smoothed analysis, it’s clear that after adding small Gaussian perturbations, matrix $A$ and $W$ will become robustly full rank with reasonable probability (Lemma 36). In this section, we will focus on the tricky part, using smoothed analysis framework to show that it is natural to assume the distinguishing matrix is robustly full rank. We will consider two settings. In the first case, the input distribution is the Gaussian distribution $\\mathcal { N } ( 0 , I _ { d } )$ , and the weights for the first layer matrix $W$ is perturbed by a small Gaussian noise. In this case we show that the augmented distinguishing matrix $M$ has smallest singular value $\\sigma _ { \\operatorname* { m i n } } ( M )$ that depends polynomially on the dimension and the amount of perturbation. This shows that for the Gaussian input distribution, $\\sigma _ { \\operatorname* { m i n } } ( M )$ is lower bounded as long as $W$ is in general position. In the second case, we will fix a full rank weight matrix $W$ , and consider an arbitrary symmetric input distribution $\\mathcal { D }$ . There is no standard way of perturbing a symmetric distribution, we give a simple perturbation $\\mathcal { D } ^ { \\prime }$ that can be arbitrarily close to $\\mathcal { D }$ , and prove that $\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )$ is lowerbounded. ", + "bbox": [ + 174, + 132, + 825, + 303 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "Perturbing $W$ for Gaussian Input We first consider the case when the input follows standard Gaussian distribution $\\mathcal { N } ( 0 , I _ { d } )$ . The weight matrix $W$ is perturbed to $\\widetilde { W }$ where ", + "bbox": [ + 174, + 316, + 823, + 349 + ], + "page_idx": 34 + }, + { + "type": "equation", + "img_path": "images/2171ebfd99cb55e9d53c11cbacc557567aa53f4a0b68aaa1386080862c7d0dad.jpg", + "text": "$$\n\\widetilde { W } = W + \\rho E .\n$$", + "text_format": "latex", + "bbox": [ + 444, + 356, + 552, + 376 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "Here $E \\in \\mathbb { R } ^ { k \\times d }$ is a random matrix whose entries are i.i.d. standard Gaussians. We will use $\\widetilde { M }$ to denote the perturbed version of the augmented distinguishing matrix $M$ . Recall that the columns of $\\widetilde { M }$ has the form: ", + "bbox": [ + 173, + 385, + 825, + 428 + ], + "page_idx": 34 + }, + { + "type": "equation", + "img_path": "images/01606f0eb491c419bfa9676bdcd6c9c22c77e28b8058d2ed23f105047c56c516.jpg", + "text": "$$\n\\widetilde { M } _ { i j } = \\mathbb { E } \\big [ ( \\widetilde { w } _ { i } ^ { \\top } x ) ( \\widetilde { w } _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ \\widetilde { w } _ { i } ^ { \\top } x \\widetilde { w } _ { j } ^ { \\top } x \\leq 0 \\} \\big ] ,\n$$", + "text_format": "latex", + "bbox": [ + 326, + 425, + 669, + 446 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "where $\\widetilde { w } _ { i } ^ { \\top }$ is the $i$ -th row of $\\widetilde { W }$ . Also, since $\\widetilde { M }$ is the augmented distinguishing matrix it has a final column $\\widetilde { M } _ { 0 } = \\mathrm { v e c } ( I _ { d } )$ . We show that the smallest singular value of $\\widetilde { M }$ is lower bounded with high probability. ", + "bbox": [ + 174, + 450, + 825, + 500 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "Theorem 9. Suppose that $k \\leq d / 5$ , and the input follows standard Gaussian distribution $\\mathcal { N } ( 0 , I _ { d } )$ . Given any weight matrix $W$ with $\\| w _ { i } \\| \\le \\tau$ for each row vector, let $\\widetilde { W }$ be a perturbed version of $W$ according to Equation (18) and $\\widetilde { M }$ be the perturbed augmented distinguishing matrix. With probability at least $\\therefore { \\exp ( - d ^ { \\Omega ( 1 ) } ) }$ , we have ", + "bbox": [ + 173, + 502, + 825, + 565 + ], + "page_idx": 34 + }, + { + "type": "equation", + "img_path": "images/2e2741df2a86a6f0dbd057543eb85209d651e6d69b0ad6df851c156f3f825185.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { M } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 397, + 571, + 599, + 593 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "We will prove this Theorem in Section C.1. ", + "bbox": [ + 176, + 607, + 459, + 622 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "Perturbing the Input Distribution Our algorithm works for a general symmetric input distribution $\\mathcal { D }$ . However, we cannot hope to get a result like Theorem 9 for every symmetric input distribution $\\mathcal { D }$ . As a simple example, if $\\mathcal { D }$ is just concentrated on 0, then we do not get any information about weights and the problem is highly degenerate. Therefore, we must specify a way to perturb the input distribution. ", + "bbox": [ + 173, + 636, + 825, + 707 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "We define a perturbation that is parametrized by a random Gaussian matrix $Q$ and a parameter $\\lambda \\in ( 0 , 1 )$ . The random matrix $Q$ is used to generate a Gaussian distribution $\\mathcal { D } _ { Q }$ with a random covariance matrix. To sample a point in $\\mathcal { D } _ { Q }$ , first sample $n \\sim \\mathcal { N } ( 0 , I _ { d } )$ , and then output $Q n$ . The $( Q , \\lambda )$ perturbation of a distribution $\\mathcal { D }$ , which we denote by $\\mathcal { D } _ { Q , \\lambda }$ is a mixture between the distribution $\\mathcal { D }$ and the distribution $\\mathcal { D } _ { Q }$ . More precisely, to sample $x$ from $\\mathcal { D } _ { Q , \\lambda }$ , pick $z$ as a Bernoulli random variable where $\\mathrm { P r } [ z = 1 ] = \\lambda$ and $\\operatorname* { P r } [ z = 0 ] = 1 - \\lambda$ ; pick $x ^ { \\prime }$ according to $\\mathcal { D }$ and pick $x ^ { \\prime \\prime } = Q n$ according to distribution $\\mathcal { D } _ { Q }$ , then let ", + "bbox": [ + 173, + 713, + 825, + 813 + ], + "page_idx": 34 + }, + { + "type": "equation", + "img_path": "images/389db64725461ba106c8deb432b1208f46a4a33d217687e6d10b2bc06704aef2.jpg", + "text": "$$\nx = \\left\\{ \\begin{array} { l l } { { x ^ { \\prime } } } & { { z = 0 } } \\\\ { { x ^ { \\prime \\prime } } } & { { z = 1 } } \\end{array} \\right.\n$$", + "text_format": "latex", + "bbox": [ + 429, + 818, + 560, + 853 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "Intuitively, the $( Q , \\lambda )$ perturbation of a distribution $\\mathcal { D }$ mixes the distribution $\\mathcal { D }$ with a Gaussian distribution $\\mathcal { D } _ { Q }$ with covariance matrix $Q Q ^ { \\top }$ . Since both $\\mathcal { D }$ and $\\mathcal { D } _ { Q }$ are symmetric, their mixture is also symmetric. Also, the TV-distance between $\\mathcal { D }$ and $\\mathcal { D } _ { Q , \\lambda }$ is bounded by $\\lambda$ . Throughout this section we will use $\\mathcal { D } ^ { \\prime }$ to denote the perturbed distribution $\\mathcal { D } _ { Q , \\lambda }$ ", + "bbox": [ + 174, + 867, + 825, + 925 + ], + "page_idx": 34 + }, + { + "type": "text", + "text": "We show that given any input distribution, after applying $( Q , \\lambda )$ -perturbation with a random Gaussian matrix $Q$ , the smallest singular value of the augmented distinguishing matrix $M ^ { \\mathcal { D ^ { \\prime } } }$ is lower bounded. Recall that $M ^ { \\mathcal { D ^ { \\prime } } }$ is defined as ", + "bbox": [ + 173, + 102, + 825, + 150 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/0c6dbfe0331c463476c956839f4c11a646b7a807639394c97083f5542f817208.jpg", + "text": "$$\n\\begin{array} { r } { M _ { i j } ^ { \\mathcal { D } ^ { \\prime } } = \\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } \\bigl [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\bigr ] , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 307, + 152, + 687, + 174 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "as the first $\\binom { k } { 2 }$ columns and has $\\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } [ x \\otimes x ]$ as the last column. ", + "bbox": [ + 173, + 179, + 602, + 196 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Theorem 10. Given weight matrix $W$ with $\\| w _ { i } \\| \\le \\tau$ for each row vector and symmetric input distribution $\\mathcal { D }$ . Suppose that $k \\leq d / 7$ and $\\sigma _ { \\operatorname* { m i n } } ( W ) \\geq \\rho ,$ , after applying $( Q , \\lambda )$ -perturbations to yield perturbed input distribution $\\mathcal { D } ^ { \\prime }$ , where $Q$ is a $d \\times d$ matrix whose entries are i.i.d. Gaussians, we have with probability at least $1 - \\exp ( - d ^ { \\Omega ( 1 ) } )$ over the randomness of $Q$ , ", + "bbox": [ + 173, + 199, + 826, + 257 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/f0c82721eb234b4f23628abe752e025b695a95ea7bdab0b62142afe1a9b4010b.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho , \\lambda ) .\n$$", + "text_format": "latex", + "bbox": [ + 379, + 261, + 617, + 281 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "We will prove this later in Section C.3. ", + "bbox": [ + 176, + 291, + 429, + 308 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "C.1 SMOOTHED ANALYSIS FOR GAUSSIAN INPUTS ", + "text_level": 1, + "bbox": [ + 173, + 323, + 540, + 338 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "In this section, we will prove Theorem 9, as restated below: ", + "bbox": [ + 173, + 349, + 565, + 364 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Theorem 9. Suppose that $k \\leq d / 5$ , and the input follows standard Gaussian distribution $\\mathcal { N } ( 0 , I _ { d } )$ . Given any weight matrix $W$ with $\\| w _ { i } \\| \\le \\tau$ for each row vector, let $\\widetilde { W }$ be a perturbed version of $W$ according to Equation (18) and $\\widetilde { M }$ be the perturbed augmented distinguishing matrix. With probability at least $\\bar { 1 - \\exp ( - d ^ { \\Omega ( 1 ) } ) }$ , we have ", + "bbox": [ + 173, + 367, + 826, + 430 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/07cbd3812a1d0644aad90b545fcb35169e2db05b60016629d710a18ae285badd.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { M } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 397, + 434, + 601, + 455 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "To prove this theorem, recall the definition of $M _ { i j }$ : ", + "bbox": [ + 176, + 467, + 506, + 482 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/c43cabe4a563e1558edff76a592a2620614c5f50f94ffdfe9d921b7d5ec73b1d.jpg", + "text": "$$\n\\begin{array} { r } { \\mathrm { m a t } ( M _ { i j } ) = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x x ^ { \\top } ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 312, + 486, + 684, + 507 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Since Gaussian distribution is highly symmetric, for every direction $u$ that is orthogonal to both $w _ { i }$ and $w _ { j }$ , we have $u ^ { \\top } \\operatorname* { m a t } ( M _ { i j } ) u$ be a constant. We can compute this constant as ", + "bbox": [ + 173, + 517, + 821, + 546 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/c45a0947e5e174aa65606ed4e48e03a88b081e38edfc0929f77b60d93f324533.jpg", + "text": "$$\nm _ { i j } : = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] .\n$$", + "text_format": "latex", + "bbox": [ + 351, + 550, + 645, + 571 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "This implies that if we consider $\\mathrm { m a t } ( M _ { i j } ) - m _ { i j } I _ { d }$ , it is going to be a matrix whose rows and columns are in span of $w _ { i }$ and $w _ { j }$ . In fact we can compute the matrix explicitly as the following lemma: ", + "bbox": [ + 174, + 583, + 826, + 626 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Lemma 19. Suppose input $x$ follows standard Gaussian distribution $\\mathcal { N } ( 0 , I _ { d } )$ , and suppose weight matrix $W$ has full-row rank, then for any $1 \\leq i < j \\leq k$ , we have ", + "bbox": [ + 169, + 628, + 825, + 659 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/f2f08af2b50d6207e43d594044b4538d4018c475fb440ceab55e4dc86bb38788.jpg", + "text": "$$\n\\begin{array} { l } { { m a t } ( M _ { i j } ) = \\displaystyle \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) \\big ) \\| w _ { i } \\| \\| w _ { j } \\| I _ { d } + \\displaystyle \\frac { \\phi _ { i j } } { \\pi } \\big ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } \\big ) } \\\\ { \\displaystyle ~ - \\frac { \\sin \\left( \\phi _ { i j } \\right) } { \\pi } ( \\frac { \\| w _ { i } \\| } { \\| w _ { j } \\| } w _ { j } w _ { j } ^ { \\top } + \\frac { \\| w _ { j } \\| } { \\| w _ { i } \\| } w _ { i } w _ { i } ^ { \\top } ) , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 243, + 661, + 754, + 729 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "where $0 < \\phi _ { i j } < \\pi$ is the angle between weight vectors $w _ { i }$ and $w _ { j }$ ", + "bbox": [ + 173, + 731, + 612, + 746 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Of course, the same lemma would be applicable to $\\widetilde { W }$ , so we have an explicit formula for $\\widetilde { M } _ { i j }$ . We will bound the smallest singular value using the idea of leave-one-out distance (as previously used in Rudelson & Vershynin (2009)). ", + "bbox": [ + 174, + 757, + 825, + 803 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Leave-one-out Distance Leave-one-out distance is a metric that is closely related to the smallest singular value but often much easier to estimate. ", + "bbox": [ + 173, + 816, + 823, + 845 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Definition 2. For a matrix $A \\in \\mathbb { R } ^ { d \\times n } ( d \\geq n )$ , the leave-one-out distance $d ( A )$ is defined to be the smallest distance between a column of $A$ to the span of other columns. More precisely, let $A _ { i }$ be the $i$ -th column of $A$ and $S _ { - i }$ be the span of all the columns except for $A _ { i }$ , then ", + "bbox": [ + 173, + 848, + 825, + 892 + ], + "page_idx": 35 + }, + { + "type": "equation", + "img_path": "images/327e095d69a528059b87663149d8990016bc4e4005c4555a30a10674615a02b9.jpg", + "text": "$$\nd ( A ) : = \\operatorname* { m i n } _ { i \\in [ n ] } \\| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \\| .\n$$", + "text_format": "latex", + "bbox": [ + 383, + 896, + 612, + 921 + ], + "page_idx": 35 + }, + { + "type": "text", + "text": "Rudelson & Vershynin (2009) showed that one can lowerbound the smallest singular value of a matrix by its leave-one-out distance. ", + "bbox": [ + 173, + 103, + 823, + 132 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "Lemma 20 (Rudelson & Vershynin (2009)). For matrix $A \\ \\in \\ \\mathbb { R } ^ { d \\times n } ( d \\ \\geq \\ n )$ , we always have $\\begin{array} { r } { d ( A ) \\geq \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\frac { 1 } { \\sqrt { n } } d ( A ) } \\end{array}$ . ", + "bbox": [ + 173, + 136, + 823, + 169 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "Therefore, to bound $\\sigma _ { \\mathrm { m i n } } ( \\widetilde { M } )$ we just need to lowerbound $d ( \\widetilde { M } )$ . We use the ideas similar to Bhaskara et al. (2014) and Ma et al. (2016). Since every column of $\\widetilde { M }$ (except for $\\widetilde { M } _ { 0 } ^ { \\mathrm { ~ ~ } }$ ) is random, we will try to show that even if we condition on all the other columns, because of the randomness in $\\widetilde { M } _ { i j }$ , the distance between $\\widetilde { M } _ { i j }$ to the span of other columns is large. However, there are several obstacles in this approach: ", + "bbox": [ + 173, + 181, + 825, + 261 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "1. The augmented distinguishing matrix $\\widetilde { M }$ has a special column ${ \\widetilde { M } } _ { 0 } = \\operatorname { v e c } ( I _ { d } )$ that does not have any randomness. \n2. The closed form expression for $\\widetilde { M }$ (as in Lemma 19) has complicated coefficients that are not linear in the vectors $\\widetilde { w } _ { i }$ and $\\widetilde { w } _ { j }$ . \n3. The columns of $\\widetilde { M } _ { i j }$ are not independent with each other, so if we condition on all the other columns, $\\widetilde { M } _ { i j }$ is no longer random. ", + "bbox": [ + 210, + 273, + 825, + 383 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "To address the first obstacle, we will prove a stronger version of Lemma 20 that allows a special column. ", + "bbox": [ + 173, + 395, + 823, + 424 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "Lemma 21. Let $\\textit { A } \\in \\mathbb { R } ^ { d \\times ( n + 1 ) }$ $( d ~ \\geq ~ n + 1 )$ be an arbitrary matrix whose columns are $A _ { 0 } , A _ { 1 } , . . . , A _ { n }$ . For any $i = 1 , 2 , . . . , n ,$ , let $S _ { - i }$ be the subspace spanned by all the other columns (including $A _ { 0 }$ ) except for $A _ { i }$ , and let $\\begin{array} { r } { d ^ { \\prime } ( A ) : = \\operatorname* { m i n } _ { i = 1 , \\ldots , n } \\left| \\left| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \\right| \\right| } \\end{array}$ . Suppose the column $A _ { 0 }$ has norm $\\sqrt { d }$ and $A _ { 1 } , . . . , A _ { n }$ has norm at most $C$ , then ", + "bbox": [ + 173, + 428, + 825, + 491 + ], + "page_idx": 36 + }, + { + "type": "equation", + "img_path": "images/200f671dae57b351f811bbce765f864f5e9c95248880c668f14c8e54edbddb1d.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\operatorname* { m i n } { \\Bigl ( } { \\sqrt { \\frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \\prime } ( A ) { \\Bigr ) } .\n$$", + "text_format": "latex", + "bbox": [ + 312, + 497, + 684, + 532 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "This lemma shows that if we can bound the leave-one-out distance for all but one column, then the smallest singular value of the matrix is still lowerbounded as long as the columns do not have very different norms. We defer the proof to Section C.2. ", + "bbox": [ + 174, + 546, + 825, + 589 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "For the second obstacle, we show that these coefficients are lowerbounded with high probability. \nTherefore we can condition on the event that all the coefficients are large enough. ", + "bbox": [ + 174, + 594, + 818, + 625 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "Lemma 22. Given weight vectors $w _ { i }$ and $w _ { j }$ with norm $\\| w _ { i } \\| , \\| w _ { j } \\| \\leq \\tau ,$ , let $\\widetilde { w } _ { i } = w _ { i } + \\rho \\varepsilon _ { i } , \\widetilde { w } _ { j } =$ $w _ { j } + \\rho \\varepsilon _ { j }$ where $\\varepsilon _ { i } , \\varepsilon _ { j }$ eare i.i.d. Gaussian random vectors. With probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , we know $\\lVert \\widetilde { w } _ { i } \\rVert \\leq \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 } , \\lVert \\widetilde { w } _ { j } \\rVert \\leq \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 }$ and ", + "bbox": [ + 173, + 627, + 825, + 678 + ], + "page_idx": 36 + }, + { + "type": "equation", + "img_path": "images/d6cf955df1684ede68d51ba0a6b4a522588bfd3da9b9e11e4624ff89ff30510c.jpg", + "text": "$$\n\\widetilde { \\phi } _ { i j } \\ge \\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } d } } ,\n$$", + "text_format": "latex", + "bbox": [ + 421, + 684, + 575, + 724 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "where $\\widetilde { \\phi } _ { i j }$ is the angle between $\\widetilde { w } _ { i }$ and $\\widetilde { w } _ { j }$ . In particular, if $\\widetilde { \\cdot } \\widetilde { W } = W + \\rho E$ where $E$ is an i.i.d. Gaussian random matrix, with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , for all i, $\\| \\widetilde { w } _ { i } \\| \\le \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 }$ , and for all $i < j$ , the coefficient $\\widetilde { \\phi } _ { i j } / \\pi$ in front of the term $\\widetilde { w } _ { i } \\widetilde { w } _ { j } ^ { \\top } + \\widetilde { w } _ { j } \\widetilde { w } _ { i } ^ { \\top }$ is at least $\\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { ( \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } d } ) \\pi }$ . ", + "bbox": [ + 173, + 731, + 825, + 797 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "This lemma intuitively says that after the perturbation $\\widetilde { w } _ { i }$ and $\\widetilde { w } _ { j }$ cannot be close to co-linear. We defer the detailed proof to Section C.2. ", + "bbox": [ + 173, + 806, + 825, + 835 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "For the final obstacle, we use ideas very similar to Ma et al. (2016) which decouples the randomness of the columns. ", + "bbox": [ + 174, + 842, + 825, + 871 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "Proof of Theorem 9. Let $E _ { 1 }$ be the event that Lemma 22 does not hold. Event $E _ { 1 }$ will be one of the bad events (but note that we do not condition on $E _ { 1 }$ not happening, we use a union bound at the end). ", + "bbox": [ + 174, + 881, + 825, + 924 + ], + "page_idx": 36 + }, + { + "type": "text", + "text": "We partition $[ d ]$ into two disjoint subsets $L _ { 1 } , L _ { 2 }$ of size $d / 2$ . Let ${ \\widetilde { M } } ^ { \\prime }$ be the set of rows of $\\widetilde { M }$ indexed by $L _ { 1 } \\times L _ { 2 }$ . That is, the columns of ${ \\widetilde { M } } ^ { \\prime }$ are ", + "bbox": [ + 173, + 99, + 826, + 136 + ], + "page_idx": 37 + }, + { + "type": "equation", + "img_path": "images/293d1eaca3f9197e08805889e06933c8302cb3ae3f16a7013e1d94e4abd6498b.jpg", + "text": "$$\n\\widetilde { \\mathcal { M } } _ { i j } ^ { \\prime } = \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\big ( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } + \\widetilde { w } _ { j , L _ { 1 } } \\otimes \\widetilde { w } _ { i , L _ { 2 } } \\big ) - \\frac { \\sin \\big ( \\widetilde { \\phi } _ { i j } \\big ) } { \\pi } \\big ( \\frac { \\| \\widetilde { w } _ { i } \\| } { \\| \\widetilde { w } _ { j } \\| } \\widetilde { w } _ { j , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } + \\frac { \\| \\widetilde { w } _ { j } \\| } { \\| \\widetilde { w } _ { i } \\| } \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { i , L _ { 2 } } \\big ) ,\n$$", + "text_format": "latex", + "bbox": [ + 181, + 148, + 825, + 185 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "for $i < j$ , where $\\widetilde { w } _ { i , L }$ denotes the restriction of vector $\\widetilde { w } _ { i }$ to the subset $L$ . Note that the restriction of ${ \\mathrm { v e c } } ( I _ { d } )$ e to the rows indexed by $L _ { 1 } \\times L _ { 2 }$ eis just an all zero vector. ", + "bbox": [ + 173, + 198, + 823, + 228 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "We will focus on a column $\\widetilde { M } _ { i j } ^ { \\prime }$ with $i < j$ and try to prove it has a large distance to the span of all the other columns. Let $V _ { i j }$ be the span of all other columns, which is equal to $V _ { i j } = \\mathrm { s p a n } \\{ \\widetilde { M } _ { k l } ^ { \\prime } :$ $k < l \\wedge ( k , l ) \\neq ( i , j ) \\}$ (note that we do not need to consider $\\widetilde { M } _ { 0 }$ because that column is 0 when restricted to $L _ { 1 } \\times L _ { 2 }$ . ", + "bbox": [ + 173, + 234, + 826, + 303 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "It’s clear that $V _ { i j }$ is correlated with $\\widetilde { M } _ { i j } ^ { \\prime }$ , which is bad for the proof. To get around this problem, we f follow the idea of Ma et al. (2016) and define the following subspace that contains $V _ { i j }$ , ", + "bbox": [ + 171, + 308, + 826, + 339 + ], + "page_idx": 37 + }, + { + "type": "equation", + "img_path": "images/24384476fc375af3d2baa19a7305cfbb5557f118c03cdf77ec2b0d979feb3941.jpg", + "text": "$$\n\\begin{array} { r } { \\hat { V } _ { i j } = \\mathrm { s p a n } \\Big \\{ \\widetilde { w } _ { k , L _ { 1 } } \\otimes x , x \\otimes \\widetilde { w } _ { k , L _ { 2 } } , \\widetilde { w } _ { j , L _ { 1 } } \\otimes x , x \\otimes \\widetilde { w } _ { i , L _ { 2 } } \\Big | k \\notin \\{ i , j \\} , x \\in \\mathbb { R } ^ { d / 2 } \\Big \\} . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 232, + 352, + 764, + 380 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "By definition $V _ { i j } \\subset \\hat { V } _ { i j }$ , and thus ${ \\hat { V } } _ { i j } ^ { \\perp } \\subset V _ { i j } ^ { \\perp }$ , where $V _ { i j } ^ { \\perp }$ denotes the orthogonal subspace of $V _ { i j }$ . Observe that $\\widetilde { w } _ { j , L _ { 1 } } \\otimes \\widetilde { w } _ { i , L _ { 2 } } , \\widetilde { w } _ { j , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } , \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { i , L _ { 2 } } \\in \\hat { V } _ { i j } ,$ thus ", + "bbox": [ + 173, + 392, + 825, + 430 + ], + "page_idx": 37 + }, + { + "type": "equation", + "img_path": "images/3211454539b85db3e90ed4ae61319f9607fc9902b8be7036c0ae6ed83b13856b.jpg", + "text": "$$\n\\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } ^ { \\prime } = \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\left( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } \\right) .\n$$", + "text_format": "latex", + "bbox": [ + 354, + 440, + 642, + 476 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "Note that $\\begin{array} { r } { ( k - 2 ) d / 2 + ( k - 2 ) d / 2 + d / 2 + d / 2 = ( k - 1 ) d < \\frac { 4 } { 5 } \\cdot \\frac { d ^ { 2 } } { 4 } } \\end{array}$ $\\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } }$ is independent with $\\hat { V } _ { i j }$ . Moreover, subspace . Then by Lemma 31, we know that with $\\hat { V } _ { i j }$ has dimension at most $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ ", + "bbox": [ + 173, + 489, + 826, + 541 + ], + "page_idx": 37 + }, + { + "type": "equation", + "img_path": "images/e44571cb73b58bf0af774e281a6423478a5f401287041745c4bdf48bcf4ab7e2.jpg", + "text": "$$\n\\begin{array} { r } { \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\left( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } \\right) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 364, + 553, + 632, + 577 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "Let $E _ { 2 }$ be the event that this inequality does not hold for some $i , j$ . ", + "bbox": [ + 173, + 588, + 611, + 603 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "Let $S _ { i j } = \\mathrm { s p a n } \\{ \\widetilde { M } _ { 0 } , \\widetilde { M } _ { k l } : k < l \\land ( k , l ) \\neq ( i , j ) \\} .$ . Now we know when neither bad events $E _ { 1 }$ or $E _ { 2 }$ happens, for every pair $i < j$ , ", + "bbox": [ + 174, + 611, + 825, + 642 + ], + "page_idx": 37 + }, + { + "type": "equation", + "img_path": "images/269380e7eee6006b385dc12efc8dde1841a96fcd5b0f25132b7c99601c88e20b.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } \\ge \\mathrm { P r o j } _ { V _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } ^ { \\prime } } \\\\ & { \\qquad \\ge \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } ^ { \\prime } } \\\\ & { \\qquad = \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\left( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } \\right) } \\\\ & { \\qquad \\ge \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 359, + 654, + 637, + 758 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "Currently, we have proved that for any $i < j$ , the distance between column $\\widetilde { M } _ { i j }$ and the span of other columns is at least inverse polynomial. To use Lemma 21 we just need to give a bound on the norms of these columns. By Lemma 22, we know when $E _ { 1 }$ does not happen ", + "bbox": [ + 173, + 779, + 826, + 824 + ], + "page_idx": 37 + }, + { + "type": "equation", + "img_path": "images/8b9ff1bf895a5cc0443b1ee775e768ff42659d8f57ccba30fe837d35d7a0f240.jpg", + "text": "$$\n\\forall i , \\| \\widetilde { w } _ { i } \\| \\leq \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } ,\n$$", + "text_format": "latex", + "bbox": [ + 411, + 837, + 583, + 872 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "where $\\tau$ is the uniform upper bound of the norm of every row vector of $W$ . Let $\\begin{array} { r } { \\widetilde { \\tau } = \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } } \\end{array}$ , we know $\\widetilde { \\tau } = \\mathrm { p o l y } ( \\tau , d , \\rho )$ . ", + "bbox": [ + 174, + 886, + 825, + 925 + ], + "page_idx": 37 + }, + { + "type": "text", + "text": "Thus, we have ", + "bbox": [ + 174, + 103, + 271, + 118 + ], + "page_idx": 38 + }, + { + "type": "equation", + "img_path": "images/976005eaf83f38f736b87133d8473d31cf2486f6dde09cc75de494c2c51c5e95.jpg", + "text": "$$\n\\begin{array} { l } { \\displaystyle | \\widetilde { M } _ { i j } | | \\le \\frac { 1 } { \\pi } \\bigl ( \\widetilde { \\phi } _ { i j } | \\cos ( \\widetilde { \\phi } _ { i j } ) | + \\sin ( \\widetilde { \\phi } _ { i j } ) \\bigr ) | | \\widetilde { w } _ { i } | | | \\widetilde { w } _ { j } | | \\sqrt { d } } \\\\ { \\displaystyle \\qquad + \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } ( \\| \\widetilde { w } _ { i } \\| \\| \\widetilde { w } _ { j } \\| + \\| \\widetilde { w } _ { j } \\| \\| \\widetilde { w } _ { i } \\| ) } \\\\ { \\displaystyle \\qquad + \\frac { \\sin ( \\widetilde { \\phi } _ { i j } ) } { \\pi } ( \\| \\widetilde { w } _ { i } \\| \\| \\widetilde { w } _ { j } \\| + \\| \\widetilde { w } _ { j } \\| \\| \\widetilde { w } _ { i } \\| ) } \\\\ { \\displaystyle \\qquad \\le \\frac { \\widetilde { \\tau } ^ { 2 } } { \\pi } ( \\pi + 1 ) \\sqrt { d } + 2 \\widetilde { \\tau } ^ { 2 } + \\frac { 2 \\widetilde { \\tau } ^ { 2 } } { \\pi } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 325, + 122, + 673, + 256 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "Thus, there exists $C = \\mathrm { p o l y } ( \\tau , d , \\rho )$ , such that $\\| \\widetilde { M } _ { i j } \\| \\le C$ for every $i < j$ . Now applying Lem$\\mathrm { \\ m a } 2 1$ immediately gives the result. ", + "bbox": [ + 173, + 261, + 825, + 292 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "C.2 PROOF OF AUXILIARY LEMMAS FOR SECTION C.1 ", + "text_level": 1, + "bbox": [ + 174, + 308, + 566, + 323 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "We will first prove the characterization for columns in the augmented distinguishing matrix. ", + "bbox": [ + 171, + 333, + 776, + 349 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "Proof of Lemma 19. For simplicity, we start by assuming that every weight vector $w _ { i }$ has unit norm. At the end of the proof we will discuss how to incorporate the norms of $w _ { i } , w _ { j }$ . Also throughout the proof we will abuse notation to use $M _ { i j }$ as its matrix form $\\mathrm { m a t } ( M _ { i j } )$ . ", + "bbox": [ + 173, + 358, + 825, + 402 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "$\\boldsymbol { S } _ { i j }$ e subspace spanned by be a set of orthonorma $w _ { i }$ and sis f $w _ { j }$ Let su $\\mathcal { S } _ { i j } ^ { \\perp }$ behat onaland $\\boldsymbol { S } _ { i j }$ . Let. We 1 2use matrix $\\{ e _ { 1 } ^ { ( i , j ) } , e _ { 2 } ^ { ( i , j ) } \\}$ $S _ { i j } \\in \\mathbb { R } ^ { d \\times 2 }$ to represent subspace $\\boldsymbol { S } _ { i j }$ $\\boldsymbol { S } _ { i j }$ 1 , which matrix has $e _ { 1 } ^ { ( i , j ) } = w _ { i }$ $e _ { 1 } ^ { ( i , j ) }$ and $e _ { 2 } ^ { ( i , j ) }$ $\\langle e _ { 2 } ^ { ( i , j ) } , w _ { j } \\rangle > 0$ as two columns. Also, let $S _ { i j } ^ { \\perp }$ be a $d \\times ( d - 2 )$ matrix, whose columns constitute an orthonormal basis of $\\begin{array} { r } { S _ { i j } ^ { \\perp } } \\end{array}$ . ", + "bbox": [ + 173, + 409, + 826, + 479 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "Let $\\mathrm { P r o j } _ { S _ { i j } } = S _ { i j } S _ { i j } ^ { \\top }$ , and $\\mathrm { P r o j } _ { { S } _ { i j } ^ { \\perp } } = I _ { d } - S _ { i j } S _ { i j } ^ { \\top }$ . Then, we have ", + "bbox": [ + 173, + 484, + 601, + 506 + ], + "page_idx": 38 + }, + { + "type": "equation", + "img_path": "images/340c41fbbac062c8faa94d8b1c6bf06f4e1c4685bca091ab595bfc6729217ee2.jpg", + "text": "$$\n\\begin{array} { r l } & { M _ { i j } = \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } } \\\\ & { \\qquad = ( \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) } \\\\ & { \\qquad = ( \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 267, + 512, + 728, + 580 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "First, we show that ", + "bbox": [ + 173, + 592, + 302, + 606 + ], + "page_idx": 38 + }, + { + "type": "equation", + "img_path": "images/5b1a53ed098a4933e86c481a09f273c11ca649eb6197a44240f831a9460c924d.jpg", + "text": "$$\n\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathrm { P r o j } _ { S _ { i j } } I _ { d } = m _ { i j } I _ { d } ,\n$$", + "text_format": "latex", + "bbox": [ + 372, + 606, + 622, + 626 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "which is equivalent to proving that $\\mathrm { P r o j } _ { { S _ { i j } ^ { \\perp } } } M _ { i j } = m _ { i j } \\mathrm { P r o j } _ { { S _ { i j } ^ { \\perp } } } I _ { d }$ . It’s obvious that the column span of $\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }$ belongs to the subspace $S _ { i j } ^ { \\perp }$ . Actually, the row span of $\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }$ also belongs to the subspace $\\begin{array} { r } { S _ { i j } ^ { \\perp } } \\end{array}$ . To show this, let’s consider $u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } ) v$ , where $u \\in S _ { i j } ^ { \\perp }$ and $v \\in S _ { i j }$ . ", + "bbox": [ + 173, + 627, + 826, + 684 + ], + "page_idx": 38 + }, + { + "type": "equation", + "img_path": "images/5edcc434f3e3845868941fade83432bcfc6ea3f527a514d1787efc31d71f1d44.jpg", + "text": "$$\n\\begin{array} { r l } & { u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } ) v = u ^ { \\top } ( I _ { d } - S _ { i j } S _ { i j } ^ { \\top } ) M _ { i j } v } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad = ( u ^ { \\top } - u ^ { \\top } S _ { i j } S _ { i j } ^ { \\top } ) M _ { i j } v } \\\\ & { \\quad \\quad \\quad \\quad = u ^ { \\top } M _ { i j } v , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 351, + 690, + 645, + 757 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "where the last equality holds since $u \\in S _ { i j } ^ { \\perp }$ is orthogonal to $e _ { 1 } ^ { ( i , j ) }$ and $e _ { 2 } ^ { ( i , j ) }$ . We also know that ", + "bbox": [ + 171, + 762, + 794, + 782 + ], + "page_idx": 38 + }, + { + "type": "equation", + "img_path": "images/88ca71a64bf9179ff1a83204c88526b19036493378f3491446a5f4e103166480.jpg", + "text": "$$\n\\begin{array} { r l } & { u ^ { \\top } M _ { i j } v = u ^ { \\top } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x x ^ { \\top } ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] v } \\\\ & { \\qquad = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( u ^ { \\top } x ) ( v ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { \\qquad = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( v ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] \\mathbb { E } [ ( u ^ { \\top } x ) ] } \\\\ & { \\qquad = 0 , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 287, + 786, + 710, + 869 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "where the third equality holds because $u ^ { \\top } x$ is independent with $w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x$ and $v ^ { \\top }$ . Note since $u$ is orthogonal with $w _ { i } , w _ { j } , v$ , we know for standard Gaussian vector $x$ , random variable $u ^ { \\top } x$ is independent with $w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x , v ^ { \\top } x$ . ", + "bbox": [ + 173, + 876, + 826, + 926 + ], + "page_idx": 38 + }, + { + "type": "text", + "text": "Since the column span and row span of $\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }$ both belong to the subspace $S _ { i j } ^ { \\perp }$ , there must exist a $( d - 2 ) \\times ( d - 2 )$ matrix $C$ , such that $\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } = S _ { i j } ^ { \\perp } C ( S _ { i j } ^ { \\perp } ) ^ { \\top }$ . We only need to show this matrix $C$ must be $m _ { i j } I _ { d - 2 }$ . In order to show this, we prove for any $u , v \\in S _ { i j } ^ { \\perp }$ , $u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } ) v =$ $m _ { i j } u ^ { \\top } v$ . ", + "bbox": [ + 173, + 102, + 825, + 178 + ], + "page_idx": 39 + }, + { + "type": "equation", + "img_path": "images/f67ef5cd715fdde099f599cbd9957db928557f0a3e002908e250d6d700d5eecb.jpg", + "text": "$$\n\\begin{array} { r l } { u ^ { \\top } \\big ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } \\big ) v = u ^ { \\top } M _ { i j } v } & { } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 267, + 179, + 728, + 309 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "where the fourth equality holds because $u ^ { \\top } x , v ^ { \\top } x$ are independent with $w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x$ . Thus, we know ", + "bbox": [ + 173, + 310, + 727, + 347 + ], + "page_idx": 39 + }, + { + "type": "equation", + "img_path": "images/de4e34655d43ff3f0df44102eba79a3b5104c60e264b957a5e6fa89e57fb05ab.jpg", + "text": "$$\n\\begin{array} { r l } & { M _ { i j } = ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathrm { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) } \\\\ & { \\qquad = m _ { i j } I _ { d } + ( \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 279, + 348, + 717, + 395 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "Let’s now compute the closed form for $m _ { i j }$ . Recall that ", + "bbox": [ + 171, + 402, + 540, + 419 + ], + "page_idx": 39 + }, + { + "type": "equation", + "img_path": "images/e9e0cc8d3d13f11f0c4762e3530d7d542d3e22aea304eecd54ece4dc87b9dd18.jpg", + "text": "$$\nm _ { i j } : = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] .\n$$", + "text_format": "latex", + "bbox": [ + 351, + 421, + 645, + 441 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "Note, we only need to consider input $x$ within subspace $\\boldsymbol { S } _ { i j }$ , which subspace has dimension two. Using the polar representation of two-dimensional Gaussian random variables ( $r$ is the radius and $\\theta$ is the angle), we have ", + "bbox": [ + 173, + 444, + 825, + 486 + ], + "page_idx": 39 + }, + { + "type": "equation", + "img_path": "images/699f5b5c0270a081433d9f63084a503d56d984d5fa42d4f681c5d34f00b6d9ce.jpg", + "text": "$$\nm _ { i j } = \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 3 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { \\pi } { 2 } - \\phi _ { i j } } ^ { \\frac { \\pi } { 2 } } 2 \\cos ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) d \\theta = \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) \\big ) .\n$$", + "text_format": "latex", + "bbox": [ + 169, + 488, + 802, + 527 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "Next, we compute the closed form of $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ . Note $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ is symmetric, because $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j } = M _ { i j } - m _ { i j } I _ { d } + m _ { i j } S _ { i j } S _ { i j } ^ { \\top }$ , and $M _ { i j } , I _ { d }$ and $S _ { i j } S _ { i j } ^ { \\top }$ are all symmetric. It’s obvious that the column span of $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ belongs to subspace $\\boldsymbol { S } _ { i j }$ . Combined with the fact that $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ is symmetric, we know the row span of $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ also belongs to the subspace $\\boldsymbol { S } _ { i j }$ . Thus, matrix $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }$ can be represented as a linear combination of $( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top }$ , ", + "bbox": [ + 173, + 535, + 830, + 626 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "P $\\mathrm { r o j } _ { S _ { i j } } M _ { i j } = c _ { 1 1 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 2 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } )$ > , \nwhere coeffic $c _ { 1 1 } ^ { ( i , j ) } , c _ { 1 2 } ^ { ( i , j ) } , c _ { 2 1 } ^ { ( i , j ) }$ and r com $c _ { 2 2 } ^ { ( i , j ) }$ are four coefficients. Now, we onion. Similar as the computation for eed to figure out the four, we use polar integration $m _ { i j }$ \nto show that, ", + "bbox": [ + 173, + 638, + 856, + 715 + ], + "page_idx": 39 + }, + { + "type": "equation", + "img_path": "images/7027e99745eddefbe6e44660684c229f4e30424bf6e8e02ec94d1e94818a317e.jpg", + "text": "$$\n\\begin{array} { l } { { { \\displaystyle c _ { 1 1 } ^ { ( i , j ) } = \\langle P r o j _ { S _ { i j } } M _ { i j } , ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { T } \\rangle } } } \\\\ { { { \\displaystyle ~ = \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 5 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { \\pi } { 2 } - \\phi _ { i j } } ^ { \\frac { \\pi } { 2 } } \\big ( \\cos ^ { 3 } ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) + \\cos ( \\theta ) \\cos ^ { 3 } ( \\theta + \\phi _ { i j } ) \\big ) d \\theta } } } \\\\ { { { \\displaystyle ~ = \\frac { 1 } { 4 \\pi } ( 1 2 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 9 \\sin ( \\phi _ { i j } ) - \\sin ( 3 \\phi _ { i j } ) ) , } } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 202, + 715, + 799, + 811 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "where the first equality holds because $e _ { 1 } ^ { ( i , j ) }$ is orthogonal with $e _ { 2 } ^ { ( i , j ) }$ . Similarly, we can show that ", + "bbox": [ + 166, + 813, + 808, + 833 + ], + "page_idx": 39 + }, + { + "type": "equation", + "img_path": "images/22ab9c960c9e8e0eb7102a0ed59075996af0bfb5497222b8b82765ebd4ee72a8.jpg", + "text": "$$\n\\begin{array} { l } { { \\tiny \\begin{array} { l } { { ( i , j ) = \\displaystyle \\langle P r o j _ { S _ { i j } } M _ { i j } , ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { T } \\rangle } } \\\\ { { \\tiny = \\displaystyle \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 5 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { r } { 2 } - \\phi _ { i j } } ^ { \\frac { r } { 2 } } \\big ( \\cos ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) \\sin ^ { 2 } ( \\theta ) + \\cos ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) \\sin ^ { 2 } ( \\theta + \\phi _ { i j } ) \\big ) \\cos ( \\theta ) \\big \\ d ( \\theta + \\phi _ { i j } \\big ) } } \\\\ { { \\tiny = \\displaystyle \\frac { 1 } { 4 \\pi } \\big ( 4 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 7 \\sin ( \\phi _ { i j } ) + \\sin ( 3 \\phi _ { i j } ) \\big ) , } } \\end{array} } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 833, + 839, + 929 + ], + "page_idx": 39 + }, + { + "type": "text", + "text": "and ", + "bbox": [ + 173, + 104, + 202, + 117 + ], + "page_idx": 40 + }, + { + "type": "equation", + "img_path": "images/f3b2964960e8cb93d0b3a568703de23d0d427a64ed8750921625facffffa1b4e.jpg", + "text": "$$\n\\begin{array} { c l } { { \\frac { ( i , j ) } { 2 1 } = \\langle { \\cal P r o j } _ { S _ { i j } } M _ { i j } , ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { T } \\rangle } } \\\\ { { } } & { { { } } } \\\\ { { } } & { { = \\displaystyle \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 5 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { r } { 2 } - \\phi _ { i j } } ^ { \\frac { r } { 2 } } \\big ( - \\cos ^ { 2 } ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) \\sin ( \\theta ) + \\cos ( \\theta ) \\cos ^ { 2 } ( \\theta + \\phi _ { i j } ) \\sin ( \\theta ) \\big ) \\big ) \\big \\langle ( e _ { 2 } ^ { ( i , j ) } ) e _ { 1 } ^ { \\frac { r } { 2 } } \\big \\rangle } } \\\\ { { } } & { { { } } } \\\\ { { } } & { { = \\displaystyle \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\sin ( \\phi _ { i j } ) - \\cos ( \\phi _ { i j } ) \\sin ^ { 2 } ( \\phi _ { i j } ) \\big ) . } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 118, + 839, + 212 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "It’s easy to check that c(i,j12 $c _ { 1 2 } ^ { ( i , j ) } = c _ { 2 1 } ^ { ( i , j ) }$ . Let $M _ { i j } ^ { \\prime }$ be $\\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j }$ . Then, according to above computation, we know ", + "bbox": [ + 173, + 217, + 825, + 251 + ], + "page_idx": 40 + }, + { + "type": "equation", + "img_path": "images/f03940054ed6b7df82e1cf1dfba5590912cba2b1ae9005b18834bbd243099e03.jpg", + "text": "$$\n\\begin{array} { r l } & { { \\mathcal { U } _ { i j } ^ { \\prime } = \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } } } \\\\ & { \\quad = ( c _ { 1 1 } ^ { ( i , j ) } - m _ { i j } ) ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + ( c _ { 2 2 } ^ { ( i , j ) } - m _ { i j } ) ( } \\\\ & { \\quad = \\frac { 1 } { 4 \\pi } \\big ( 8 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 5 \\sin ( \\phi _ { i j } ) - \\sin ( 3 \\phi _ { i j } ) \\big ) ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } } \\\\ & { \\quad \\quad \\quad + \\frac { 1 } { 4 \\pi } \\big ( - 3 \\sin ( \\phi _ { i j } ) + \\sin ( 3 \\phi _ { i j } ) \\big ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } } \\\\ & { \\quad \\quad \\quad + \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\sin ( \\phi _ { i j } ) - \\cos ( \\phi _ { i j } ) \\sin ^ { 2 } ( \\phi _ { i j } ) \\big ) \\big ( ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } \\big ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 256, + 839, + 390 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "Since $e _ { 1 } ^ { ( i , j ) } = w _ { i }$ and $\\begin{array} { r } { e _ { 2 } ^ { ( i , j ) } = \\frac { 1 } { \\sin ( \\phi _ { i j } ) } w _ { j } - \\cot ( \\phi _ { i j } ) w _ { i } } \\end{array}$ , we can also express $M _ { i j } ^ { \\prime }$ as a linear combination of $w _ { i } w _ { i } ^ { \\top } , w _ { j } w _ { j } ^ { \\top } , w _ { i } w _ { j } ^ { \\top }$ and $w _ { j } w _ { i } ^ { \\top }$ . ", + "bbox": [ + 176, + 401, + 823, + 441 + ], + "page_idx": 40 + }, + { + "type": "equation", + "img_path": "images/3abc60439243dcc2709d0f369dedab90a793780bdde9eede4a08c5ea3177f8df.jpg", + "text": "$$\n\\begin{array} { l } { { \\displaystyle { \\cal U } _ { i j } ^ { \\prime } = \\frac { 1 } { 4 \\pi } \\big ( 8 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 5 \\sin ( \\phi _ { i j } ) - \\sin ( 3 \\phi _ { i j } ) \\big ) w _ { i } w _ { i } ^ { \\top } } } \\\\ { { \\displaystyle ~ + \\frac { 1 } { 4 \\pi } \\big ( - 3 \\sin ( \\phi _ { i j } ) + \\sin ( 3 \\phi _ { i j } ) \\big ) \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) ^ { \\top } } } \\\\ { { \\displaystyle ~ + \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\sin ( \\phi _ { i j } ) - \\cos ( \\phi _ { i j } ) \\sin ^ { 2 } ( \\phi _ { i j } ) \\big ) \\big ( w _ { i } \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) ^ { \\top } + \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) \\big ) ^ { \\top } ~ , } } \\\\ { { \\displaystyle ~ = \\frac { \\phi _ { i j } } { \\pi } \\big ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } \\big ) - \\frac { \\sin \\big ( \\phi _ { i j } \\big ) } { \\pi } \\big ( w _ { j } w _ { j } ^ { \\top } + w _ { i } w _ { i } ^ { \\top } \\big ) . } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 446, + 839, + 579 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "Thus, ", + "bbox": [ + 173, + 579, + 214, + 593 + ], + "page_idx": 40 + }, + { + "type": "equation", + "img_path": "images/509b3987d7840b5066edfb0c29e348d10c4519685529668afa3bb9111c877a46.jpg", + "text": "$$\n\\begin{array} { l } { { { \\displaystyle M _ { i j } = m _ { i j } I _ { d } + M _ { i j } ^ { \\prime } } } } \\\\ { { { \\displaystyle \\quad = \\frac { 1 } { \\pi } ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) ) I _ { d } + \\frac { \\phi _ { i j } } { \\pi } ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } ) - \\frac { \\sin ( \\phi _ { i j } ) } { \\pi } ( w _ { j } w _ { j } ^ { \\top } + w _ { i } w _ { i } ^ { \\top } ) } . } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 197, + 598, + 802, + 651 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "Finally, if the rows $w _ { i } , w _ { j }$ do not have unit norm, let $\\bar { w } _ { i } = w _ { i } / \\| w _ { i } \\| , \\bar { w } _ { j } = w _ { j } / \\| w _ { j } \\|$ , we know ", + "bbox": [ + 166, + 661, + 795, + 679 + ], + "page_idx": 40 + }, + { + "type": "equation", + "img_path": "images/787a9926d3b121432db6642c9df00ec9206deff208f11280d9c2d927afb3582b.jpg", + "text": "$$\n\\begin{array} { r l } & { m _ { i j } = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { \\quad \\quad = \\| w _ { i } \\| \\| w _ { j } \\| \\mathbb { E } \\big [ ( \\bar { w } _ { i } ^ { \\top } x ) ( \\bar { w } _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { \\quad = \\cfrac { 1 } { \\pi } ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) ) \\| w _ { i } \\| \\| w _ { j } \\| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 320, + 683, + 676, + 757 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "Here we used the fact that the indicator variable does not change whether we use $w _ { i } , w _ { j }$ or $\\bar { w } _ { i } , \\bar { w } _ { j }$ Similarly, ", + "bbox": [ + 173, + 758, + 821, + 789 + ], + "page_idx": 40 + }, + { + "type": "equation", + "img_path": "images/ffdf4b760518455cd9796eb4652719b3597eefcafb785f6acf425c8c95d60270.jpg", + "text": "$$\n\\begin{array} { r l } & { = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) x x ^ { \\top } \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { = \\| w _ { i } \\| \\| w _ { j } \\| \\mathbb { E } \\big [ ( \\bar { w } _ { i } ^ { \\top } x ) ( \\bar { w } _ { j } ^ { \\top } x ) x x ^ { \\top } \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { = \\frac { 1 } { \\pi } ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) ) \\| w _ { i } \\| \\| w _ { j } \\| I _ { d } + \\frac { \\phi _ { i j } } { \\pi } ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } ) - \\frac { \\sin ( \\phi _ { i j } ) } { \\pi } ( \\frac { \\| w _ { i } \\| } { \\| w _ { j } \\| } \\frac { w _ { j } w ^ { \\top } } { \\| w _ { j } \\| } + \\frac { \\| w _ { j } \\| ^ { 2 } } { \\| w _ { i } \\| ^ { 2 } } ) } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 202, + 791, + 861, + 871 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "Now we can prove the lemmas used to handle the two obstacles. First we give the stronger leaveone-out distance bound. ", + "bbox": [ + 173, + 895, + 825, + 924 + ], + "page_idx": 40 + }, + { + "type": "text", + "text": "Proof of Lemma 21. The smallest singular value of $A$ can be defined as follows: ", + "bbox": [ + 171, + 102, + 705, + 118 + ], + "page_idx": 41 + }, + { + "type": "equation", + "img_path": "images/f6e6fbf5ca2c18f2d02727ced76a990351096d807d6518165d0687d305cbbe44.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( A ) : = \\operatorname* { m i n } _ { u : \\| u \\| = 1 } \\| A u \\| .\n$$", + "text_format": "latex", + "bbox": [ + 408, + 125, + 588, + 150 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "Suppose $u ^ { * } \\in \\mathrm { a r g m i n } _ { u : \\| u \\| = 1 } \\| A u \\|$ . Let $\\boldsymbol { u } _ { i } ^ { * }$ be the coordinate corresponding to the column $A _ { i }$ , for $0 \\leq i \\leq n$ . We consider two cases here. If $\\begin{array} { r } { | u _ { 0 } ^ { * } | \\geq \\sqrt { \\frac { 4 n C ^ { 2 } } { 4 n C ^ { 2 } + d } } } \\end{array}$ , then we have ", + "bbox": [ + 173, + 156, + 825, + 199 + ], + "page_idx": 41 + }, + { + "type": "equation", + "img_path": "images/657685ea8c9db0f55d81c23487abc9cd3800b97ecc77731e26ea36e6bddb6f84.jpg", + "text": "$$\n\\begin{array} { r l } { \\sigma _ { \\operatorname* { m i n } } ( A ) = \\left| A u ^ { c } \\right| } & { = } \\\\ & { = \\left\\| A u _ { s } ^ { * } A _ { 0 } + \\sum _ { i \\leq i \\leq n } u _ { i } ^ { * } A _ { i } \\right\\| } \\\\ & { \\geq \\left\\| u _ { s } ^ { * } A _ { 0 } \\right\\| - \\left\\| \\displaystyle \\sum _ { 1 \\leq i \\leq n } u _ { i } ^ { * } A _ { i } \\right\\| } \\\\ & { \\geq \\sqrt { \\displaystyle \\frac { 4 n c ^ { 2 } } { 4 n c ^ { 2 } + d } } \\sqrt { d } - ( \\sum _ { 1 \\leq i \\leq n } | u _ { i } ^ { * } | ) C } \\\\ & { \\geq \\sqrt { \\displaystyle \\frac { 4 n c ^ { 2 } d } { 4 n C ^ { 2 } + d } } - \\sqrt { n } \\sqrt { \\displaystyle \\frac { d } { 4 n C ^ { 2 } + d } } C } \\\\ & { = \\sqrt { \\displaystyle \\frac { n c ^ { 2 } d } { 4 n C ^ { 2 } + d } } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 343, + 207, + 655, + 414 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "where the third inequality uses Cauchy-Schwarz inequality. ", + "bbox": [ + 173, + 417, + 563, + 433 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "If $\\begin{array} { r } { | u _ { 0 } ^ { * } | < \\sqrt { \\frac { 4 n C ^ { 2 } } { 4 n C ^ { 2 } + d } } } \\end{array}$ , we know $\\begin{array} { r } { \\sum _ { 1 \\leq i \\leq n } | u _ { i } ^ { * } | ^ { 2 } \\geq \\frac { d } { 4 n C ^ { 2 } + d } } \\end{array}$ . Let $k \\in \\mathrm { a r g m a x } _ { 1 \\leq i \\leq n } | u _ { i } ^ { * } |$ . We know that $\\begin{array} { r } { | u _ { k } ^ { * } | \\geq \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } \\end{array}$ . Thus, ", + "bbox": [ + 173, + 440, + 826, + 488 + ], + "page_idx": 41 + }, + { + "type": "equation", + "img_path": "images/c7e5e42aeda53f9d25f6285bc6e4dc0311917d77259f958c8900140a41323b03.jpg", + "text": "$$\n\\begin{array} { r l r } { { \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\| u _ { k } ^ { * } A _ { k } + \\sum _ { i : i \\neq k } u _ { i } ^ { * } A _ { i } \\| } } \\\\ & { } & { \\quad = | u _ { k } ^ { * } | \\| A _ { k } + \\sum _ { i : i \\neq k } \\frac { u _ { i } ^ { * } } { u _ { k } ^ { * } } A _ { i } \\| } \\\\ & { } & { \\quad \\geq | u _ { k } ^ { * } | \\| ( I _ { d } - \\operatorname* { P r o j } _ { S _ { - k } } ) A _ { k } \\| } \\\\ & { } & { \\quad \\geq | u _ { k } ^ { * } | d ^ { \\prime } ( A ) } \\\\ & { } & { \\quad \\geq \\sqrt { \\frac { d } { 4 m ^ { 2 } C ^ { 2 } + n d } } d ^ { \\prime } ( A ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 377, + 494, + 619, + 648 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "Above all, we know that the smallest singular value of $A$ is lower bounded as follows, ", + "bbox": [ + 173, + 678, + 736, + 694 + ], + "page_idx": 41 + }, + { + "type": "equation", + "img_path": "images/1a6ceb68a4f8e0ac02ac3226f78b57e271472de832fcff928aa5d81aa2719c00.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\operatorname* { m i n } { \\Bigl ( } { \\sqrt { \\frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \\prime } ( A ) { \\Bigr ) } .\n$$", + "text_format": "latex", + "bbox": [ + 313, + 699, + 684, + 734 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "Next we give the bound on the angle between two perturbed vectors $\\widetilde { w } _ { i }$ and $\\widetilde { w } _ { j }$ . ", + "bbox": [ + 173, + 761, + 694, + 777 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "Proof of Lemma 22. According to the definition of $\\rho$ -perturbation, we know $\\widetilde { w } _ { i } = w _ { i } + \\rho \\varepsilon _ { i } , \\widetilde { w } _ { j } =$ $w _ { j } + \\rho \\varepsilon _ { j }$ , where $\\varepsilon _ { i } , \\varepsilon _ { j }$ e eare i.i.d. standard Gaussian vectors. First, we show that with high probability, the projection of $\\widetilde { w } _ { i }$ on the orthogonal subspace of $\\widetilde { w } _ { j }$ is lower bounded. Denote the subspace spanned by $\\widetilde { w } _ { j }$ as $s _ { \\tilde { w } _ { j } }$ , and denote the subspace spanned by $\\{ \\widetilde { w } _ { j } , w _ { i } \\}$ as $s _ { \\tilde { w } _ { j } \\cup w _ { i } }$ . Thus, we have ", + "bbox": [ + 173, + 786, + 826, + 844 + ], + "page_idx": 41 + }, + { + "type": "equation", + "img_path": "images/00151ca82ddde56da92f09cf5f4e2a762b391292f201c84ca260e09416c4883b.jpg", + "text": "$$\n\\begin{array} { r l } & { \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } } ^ { \\perp } } \\widetilde { w } _ { i } \\right\\| \\geq \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } ( w _ { i } + \\rho \\varepsilon _ { i } ) \\right\\| } \\\\ & { \\qquad = \\rho \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } \\varepsilon _ { i } \\right\\| } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 366, + 851, + 633, + 902 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "where S ⊥wj i s the orthogonal subspace of $S _ { \\widetilde { w } _ { j } }$ ", + "bbox": [ + 174, + 909, + 473, + 926 + ], + "page_idx": 41 + }, + { + "type": "text", + "text": "Fix εj , then S ⊥wj ∪wi is a fixed subspace of $\\mathbb { R } ^ { d }$ with dimension $d - 2$ . Let $U$ be a $d \\times ( d - 2 )$ e matrix, whose columns constitute a set of orthonormal basis for the subspace $S _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\bot }$ . Thus, it’s not hard to check that $\\operatorname { P r o j } _ { \\mathcal { S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } \\varepsilon _ { i } \\overset { d } { = } U \\varepsilon$ , where $\\varepsilon \\in \\mathbb { R } ^ { d - 2 }$ eis a standard Gaussian vector. Denote $Y : = \\| \\mathrm { P r o j } _ { { S _ { \\tilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } } \\varepsilon _ { i } \\| ^ { 2 } \\overset { d } { = } \\| U \\varepsilon \\| ^ { 2 } = \\| \\varepsilon \\| ^ { 2 }$ , which is a chi-squared random variable with $( d - 2 )$ degrees of freedom. According to the tail bound for chi-squared random variable, we have ", + "bbox": [ + 171, + 102, + 826, + 205 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/1e0b6cc54f9742eca0874332630365f5a21938a11f65e88943d9c3b7a9bac735.jpg", + "text": "$$\n\\operatorname* { P r } [ | \\frac { 1 } { d - 2 } Y - 1 | \\geq t ] \\leq 2 e ^ { \\frac { - ( d - 2 ) t ^ { 2 } } { 8 } } , \\forall t \\in ( 0 , 1 ) .\n$$", + "text_format": "latex", + "bbox": [ + 333, + 207, + 661, + 238 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "Let $\\begin{array} { r } { t = \\frac { 1 } { 2 } } \\end{array}$ , we know that with probability at least $\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) } \\end{array}$ ", + "bbox": [ + 171, + 242, + 627, + 261 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/4831db2d55b3231f52b9d95341a63bc55d681a9b24e958f2a17a73dea3ca618f.jpg", + "text": "$$\nY \\geq { \\frac { d - 2 } { 2 } } .\n$$", + "text_format": "latex", + "bbox": [ + 455, + 263, + 540, + 295 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "Thus, we have kProjS⊥wj weik ≥ ρkProjS⊥wj∪wi ε ρ2(d−2) . Recall that ", + "bbox": [ + 173, + 299, + 660, + 327 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/31d8cb2e380a96d1a681b3c4a819303db9055c9305353a0d44bc8cbfa4e1d2d1.jpg", + "text": "$$\n\\begin{array} { r } { \\| \\mathrm { P r o j } _ { { S _ { \\tilde { w } _ { j } } ^ { \\perp } } } \\widetilde { w } _ { i } \\| = \\sin ( \\widetilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 398, + 330, + 598, + 356 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "We also know ", + "bbox": [ + 173, + 359, + 267, + 373 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/4eedc08e74a6cb225ddf5d89bf751059193ff53fe332656aa1601ecc5e20bd8c.jpg", + "text": "$$\n\\begin{array} { r l } & { \\| \\widetilde { \\boldsymbol { w } } _ { i } \\| = \\| \\boldsymbol { w } _ { i } + \\rho \\varepsilon _ { i } \\| } \\\\ & { \\qquad \\leq \\| \\boldsymbol { w } _ { i } \\| + \\rho \\| \\varepsilon _ { i } \\| } \\\\ & { \\qquad = \\tau + \\rho \\| \\varepsilon _ { i } \\| , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 426, + 376, + 571, + 431 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "where the last equality holds since $\\| w _ { i } \\| \\le \\tau$ . Note $\\| \\varepsilon _ { i } \\| ^ { 2 }$ is another chi-squared random variable with $d$ degrees of freedom. Similar as above, we can show that with probability at least $\\textstyle 1 - 2 \\exp ( { \\frac { - d } { 3 2 } } )$ , ", + "bbox": [ + 173, + 434, + 825, + 478 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/2c0709503cf1c9a1043014da933a8ea8d4afcf824a4f7936554c866de5fb2854.jpg", + "text": "$$\n\\| \\varepsilon _ { i } \\| ^ { 2 } \\leq { \\frac { 3 d } { 2 } } .\n$$", + "text_format": "latex", + "bbox": [ + 455, + 476, + 544, + 507 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "By union bound, we know with probability at least $\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - d } { 3 2 } ) - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) , } \\end{array}$ ", + "bbox": [ + 173, + 508, + 727, + 527 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/031d8b676a55269b44663eba4b9bec010806cf9d1afa4338788a199d777dc5c5.jpg", + "text": "$$\n\\begin{array} { r } { \\sin ( \\widetilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| \\geq \\sqrt { \\frac { \\rho ^ { 2 } ( d - 2 ) } { 2 } } , } \\\\ { \\| \\widetilde { w } _ { i } \\| \\leq \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 400, + 531, + 598, + 602 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "Combined with the fact that $\\widetilde { \\phi } _ { i j } \\geq \\sin ( \\widetilde { \\phi } _ { i j } )$ when $\\widetilde { \\phi } _ { i j } \\in [ 0 , \\pi ]$ , we know with probability at least $\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - d } { 3 2 } ) - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) } \\end{array}$ ", + "bbox": [ + 174, + 604, + 821, + 642 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/a69d9a757c5a87e694575bb881b6f3618304fb8ce287ea60af5d1a5da605a4d8.jpg", + "text": "$$\n\\begin{array} { r l } & { \\tilde { \\phi } _ { i j } \\geq \\sin ( \\tilde { \\phi } _ { i j } ) } \\\\ & { \\quad = \\frac { \\sin ( \\tilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| } { \\| \\widetilde { w } _ { i } \\| } } \\\\ & { \\quad \\geq \\frac { \\sqrt { \\frac { \\rho ^ { 2 } ( d - 2 ) } { 2 } } } { \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } } } \\\\ & { \\quad = \\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } } \\zeta } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 426, + 643, + 563, + 800 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "Given $\\widetilde { W } = W + \\rho E$ , where $E$ is an i.i.d. Gaussian matrix, by union bound, we know with probability at least $\\therefore - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 174, + 810, + 823, + 842 + ], + "page_idx": 42 + }, + { + "type": "equation", + "img_path": "images/413f4a22e5ffad4577ff5dacf5808ad263939c4bc210b3293fef7b067fcb2e39.jpg", + "text": "$$\n\\begin{array} { c } { \\displaystyle \\forall i , \\| \\widetilde { w } _ { i } \\| \\leq \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 } } \\\\ { \\displaystyle \\forall i < j , \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\geq \\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { ( \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } d } ) \\pi } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 383, + 844, + 611, + 909 + ], + "page_idx": 42 + }, + { + "type": "text", + "text": "In this section, we show that starting from any well-conditioned weight matrix $W$ , and any symmetric input distribution $\\mathcal { D }$ , how to perturb the distribution locally to $\\mathcal { D } ^ { \\prime }$ so that the smallest singular value of $M ^ { \\mathcal { D ^ { \\prime } } }$ is at least inverse polynomial. ", + "bbox": [ + 174, + 131, + 825, + 175 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Recall the definition of $( Q , \\lambda )$ -perturbation: we mix the original distribution $\\mathcal { D }$ with a distribution $\\mathcal { D } _ { Q }$ which is just a Gaussian $\\hat { \\mathcal { N } } ( 0 , Q Q ^ { \\top } )$ . To create a sample $x$ in $\\mathcal { D } ^ { \\prime }$ , with probability $1 - \\lambda$ we draw a sample from $\\mathcal { D }$ ; otherwise we draw a standard Gaussian $n \\sim \\mathcal N ( 0 , I _ { d } ) ^ { \\cdot }$ and let $x = Q n$ . We will prove Theorem 10 which we restate below: ", + "bbox": [ + 174, + 181, + 825, + 237 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Theorem 10. Given weight matrix $W$ with $\\| w _ { i } \\| \\le \\tau$ for each row vector and symmetric input distribution $\\mathcal { D }$ . Suppose that $k \\leq d / 7$ and $\\sigma _ { \\operatorname* { m i n } } ( W ) \\geq \\rho ,$ , after applying $( Q , \\lambda )$ -perturbations to yield perturbed input distribution $\\mathcal { D } ^ { \\prime }$ , where $Q$ is a $d \\times d$ matrix whose entries are i.i.d. Gaussians, we have with probability at least $1 - \\exp \\bigl ( - d ^ { \\dot { \\Omega } ( 1 ) } \\bigr )$ over the randomness of $Q$ , ", + "bbox": [ + 173, + 242, + 825, + 300 + ], + "page_idx": 43 + }, + { + "type": "equation", + "img_path": "images/0ef1c8511136fa0ae951e3c2e9e1d3a1be92b7f845de69ea8272e5db99f6e65e.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho , \\lambda ) .\n$$", + "text_format": "latex", + "bbox": [ + 379, + 309, + 617, + 330 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "To prove this, let us first take a look at the structure of augmented distinguishing matrix for these distributions. Let $M ^ { D } , M ^ { D _ { Q } } , M ^ { D ^ { \\prime } }$ be the augmented distinguishing matrices for distributions $\\mathcal { D }$ , $\\mathcal { D } _ { Q }$ and $\\mathcal { D } ^ { \\prime }$ respectively. Since $\\mathcal { D } ^ { \\prime }$ is a mixture of $\\mathcal { D }$ and $\\mathcal { D } _ { Q }$ , and the augmented distinguishing matrix is defined as expectations over samples, we immediately have ", + "bbox": [ + 173, + 345, + 825, + 405 + ], + "page_idx": 43 + }, + { + "type": "equation", + "img_path": "images/23e2f5ae3f15717d0f9066b87393febebc7d4ebea87212a7b9e505703c49b606.jpg", + "text": "$$\n\\boldsymbol { M } ^ { D ^ { \\prime } } = ( 1 - \\lambda ) \\boldsymbol { M } ^ { D } + \\lambda \\boldsymbol { M } ^ { D _ { Q } } .\n$$", + "text_format": "latex", + "bbox": [ + 392, + 414, + 604, + 434 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Our proof will go in two steps. First we will show that $\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )$ is large. Then we will show that even mixing with $M ^ { \\mathcal { D } }$ will not significantly reduce the smallest singular value, so $\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )$ is also large. In addition to the techniques that we developed in Section C.1, we need two ideas that we call noise domination and subspace decoupling to solve the new challenges here. ", + "bbox": [ + 173, + 449, + 825, + 510 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Noise Domination First let us focus on $\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )$ . This instance has weight $W$ and input distribution $\\mathcal { N } ( 0 , Q Q ^ { \\top } )$ . Let $M ^ { W Q }$ be the augmented distinguishing matrix for an instance with weight $W Q$ and input distribution $\\mathcal { N } ( 0 , I _ { d } )$ . Our first observation shows that $M ^ { \\mathcal { D } _ { Q } }$ and $M ^ { W Q }$ are closely related, and we only need to analyze the smallest singular value of $M ^ { W Q }$ . The problem now is very similar to what we did in Theorem 9, except that the weight $W Q$ is not an i.i.d. Gaussian matrix. However, we will still be able to use Theorem 9 as a black-box because the amount of noise in $W Q$ is in some sense dominating the noise in a standard Gaussian. More precisely, we use the following simple claim: ", + "bbox": [ + 173, + 526, + 825, + 640 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Claim 1. Suppose property $\\mathcal { P }$ holds for $\\textstyle { \\mathcal { N } } ( \\mu , I _ { d } )$ for any $\\mu$ , and the property $\\mathcal { P }$ is convex (in the sense that $i f \\mathcal { P }$ holds for two distributions it also holds for their mixture), then for any covariance matrix $\\Sigma \\succeq I _ { d }$ , we know $\\mathcal { P }$ also holds for $\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )$ . ", + "bbox": [ + 173, + 643, + 825, + 688 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Intuitively the claim says that if the property holds for a Gaussian distribution with smaller variance regardless of the mean, then it will also hold for a Gaussian distribution with larger variance. The proof is quite simple: ", + "bbox": [ + 173, + 699, + 825, + 743 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Proof. Let $\\Sigma ^ { \\prime } = \\Sigma - I _ { d }$ , by assumption we know $\\Sigma ^ { \\prime }$ is still a positive semidefinite matrix. Let $x \\sim { \\mathcal { N } } ( { \\boldsymbol { \\mu } } , { \\boldsymbol { \\Sigma } } )$ , $x ^ { \\prime } \\sim \\mathcal { N } ( \\mu , \\Sigma ^ { \\prime } )$ and $\\delta \\sim \\mathcal { N } ( 0 , I _ { d } )$ , by property of Gaussians it is easy to see that $x \\overset { d } { = } x ^ { \\prime } + \\delta$ . Let $d _ { x } , d _ { x ^ { \\prime } }$ and $d _ { \\delta }$ be the density function for $x , x ^ { \\prime } , \\delta$ respectively, then we know for any point $u$ ", + "bbox": [ + 173, + 766, + 825, + 829 + ], + "page_idx": 43 + }, + { + "type": "equation", + "img_path": "images/6e444d76ed3e6af5cc2e03f87a80bf1f3aec2777e6cc16bc42e941c166f4e9fb.jpg", + "text": "$$\nd _ { x } ( u ) = \\mathbb { E } _ { x ^ { \\prime } \\sim \\mathcal { N } ( \\mu , \\Sigma ^ { \\prime } ) } [ d _ { \\delta } ( u - x ^ { \\prime } ) ] .\n$$", + "text_format": "latex", + "bbox": [ + 383, + 830, + 614, + 848 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "That is, $\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )$ is a mixture of $\\mathcal { N } ( x ^ { \\prime } , I )$ . Since property $\\mathcal { P }$ is true for all $\\mathcal { N } ( x ^ { \\prime } , I )$ , it is also true for $\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )$ . □ ", + "bbox": [ + 173, + 856, + 823, + 886 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "With this claim we can immediately use the result of Theorem 9 to show $\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )$ is large. ", + "bbox": [ + 169, + 907, + 789, + 925 + ], + "page_idx": 43 + }, + { + "type": "text", + "text": "Subspace Decoupling Next we need to consider the mixture $M ^ { \\mathcal { D ^ { \\prime } } }$ . The worry here is that although $\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )$ is large, mixing with $\\mathcal { D }$ might introduce some cancellations and make $\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )$ much smaller. To prove that this cannot happen with high probability, the key observation is that in the first step, to prove $\\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } )$ is large we have only used the property of $W Q$ . If we let $\\bar { Q }$ be the projection of $Q$ to the orthogonal space of row span of $W$ , then $\\bar { Q }$ is still a Gaussian random matrix even if we condition on the value of $W Q$ ! Therefore in the second step we will use the additional randomness in $\\bar { Q }$ to show that the cancellation cannot happen. The idea of partitioning the randomness of Gaussian matrices has been widely used in analysis of approximate message passing algorithms. The actual proof is more involved and we will need to partition the Gaussian matrix $Q$ into more parts in order to handle the special column in the augmented distinguishing matrix . ", + "bbox": [ + 173, + 102, + 825, + 258 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "Now we are ready to give the full proof of Theorem 10 ", + "bbox": [ + 173, + 265, + 535, + 280 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "Proof of Theorem 10. Let us first recall the definition of augmented distinguishing matrix: $M ^ { \\mathcal { D ^ { \\prime } } }$ is a $d ^ { 2 }$ by $( k _ { 2 } + 1 )$ matrix, where the first $k _ { 2 }$ columns consist of ", + "bbox": [ + 171, + 291, + 823, + 320 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/274fee240fb0b6ab4ae681e7d58ff82ae797dfd0c0944292f2b6a3fe1ccc7611.jpg", + "text": "$$\n\\begin{array} { r } { M _ { i j } ^ { \\mathcal { D } ^ { \\prime } } : = \\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 305, + 324, + 691, + 344 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "and the last column is $\\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } [ x \\otimes x ]$ . According to the definition of $( Q , \\lambda )$ -perturbation, if we let $\\mathcal { D } _ { Q }$ be $\\mathcal { N } ( 0 , Q Q ^ { \\top } )$ , then we have ", + "bbox": [ + 171, + 348, + 825, + 376 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/07bf5296eb95c4f0630c5b0afad5ea0e42c54e81e8a8dfc729d136076d3754e3.jpg", + "text": "$$\nM ^ { D ^ { \\prime } } = ( 1 - \\lambda ) M ^ { D } + \\lambda M ^ { D _ { Q } } .\n$$", + "text_format": "latex", + "bbox": [ + 393, + 378, + 604, + 400 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "In the first step, we will try to analyze $M ^ { \\mathcal { D } _ { Q } }$ . The first $k _ { 2 }$ columns of this matrix $M ^ { \\mathcal { D } _ { Q } }$ can be written as: ", + "bbox": [ + 171, + 409, + 825, + 438 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/52c32a4e49c186f3507ed927d6280ab9071e04033ed0dad5cadea631444f1d63.jpg", + "text": "$$\n\\begin{array} { r l } & { M _ { i j } ^ { { D _ { Q } } } = \\mathbb { E } _ { x \\sim \\mathcal { D } _ { Q } } \\left[ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\right] } \\\\ & { \\quad \\quad \\quad = \\mathbb { E } _ { n \\sim \\mathcal { N } ( 0 , { I _ { d } } ) } \\left[ ( w _ { i } ^ { \\top } Q n ) ( w _ { j } ^ { \\top } Q n ) ( Q n \\otimes Q n ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } Q n w _ { j } ^ { \\top } Q n \\leq 0 \\} \\right] } \\\\ & { \\quad \\quad \\quad = Q \\otimes Q \\mathbb { E } _ { n \\sim \\mathcal { N } ( 0 , { I _ { d } } ) } \\left[ ( w _ { i } ^ { \\top } Q n ) ( w _ { j } ^ { \\top } Q n ) ( n \\otimes n ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } Q n w _ { j } ^ { \\top } Q n \\leq 0 \\} \\right] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 240, + 438, + 754, + 505 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "for any $i < j$ , and the last column is ", + "bbox": [ + 173, + 503, + 413, + 518 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/5a0fe3a6f78276d9f02acc7a9c8fb471aa239c8712ec6c6a0217f242f0881dce.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathbb { E } _ { \\boldsymbol { x } \\sim \\mathcal { D } _ { Q } } [ \\boldsymbol { x } \\otimes \\boldsymbol { x } ] = \\mathbb { E } _ { \\boldsymbol { n } \\sim \\mathcal { N } ( \\boldsymbol { 0 } , I _ { d } ) } [ Q \\boldsymbol { n } \\otimes Q \\boldsymbol { n } ] } \\\\ & { \\qquad = Q \\otimes Q \\mathbb { E } _ { \\boldsymbol { n } \\sim \\mathcal { N } ( \\boldsymbol { 0 } , I _ { d } ) } [ \\boldsymbol { n } \\otimes \\boldsymbol { n } ] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 349, + 520, + 647, + 560 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "Except for the factor $Q \\otimes Q$ , the remainder of these columns are exactly the same as the augmented distinguishing matrix of a network whose first layer weight matrix is $W Q$ and input distribution is $\\mathcal { N } ( 0 , \\bar { I } _ { d } )$ . We use $M ^ { W Q }$ to denote the augmented distinguishing matrix of such a network, then we have ", + "bbox": [ + 173, + 568, + 825, + 622 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/ae153855fedd9a054fa05fb49befe7e52889674f806ff05bda6c7d86dc26e21b.jpg", + "text": "$$\nM ^ { D _ { Q } } = Q \\otimes Q M ^ { W Q } .\n$$", + "text_format": "latex", + "bbox": [ + 419, + 619, + 578, + 638 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "Therefore we can first analyze the smallest singular value of $M ^ { W Q }$ . Let $\\widetilde { W } = W Q$ . Note that $Q$ is a Gaussian matrix, and $W$ is fixed, so $W Q$ is also a Gaussian random matrix except its entries are not i.i.d. More precisely, there are only correlations within columns of $W Q$ , and for any column of $W Q$ , the covariance matrix is $W W ^ { \\top }$ . Since the smallest singular value of $W$ is at least $\\rho$ , we know $\\sigma _ { \\operatorname* { m i n } } ( W W ^ { \\top } ) \\geq \\rho ^ { 2 }$ . Let the covariance matrix of $W Q$ be $\\sum _ { W Q } \\mathbf { \\Psi } \\in \\mathbb { R } ^ { k d \\times k d }$ , which has smallest singular value at least $\\rho ^ { 2 }$ . Therefore we know $\\Sigma _ { W Q } \\ \\succeq \\ \\rho ^ { 2 } I _ { k d }$ . It’s not hard to verify that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , the norm of every row of $W Q$ is upper bounded by poly $( \\tau , d )$ . By Claim 1, any convex property that holds for any $\\mathcal { N } ( 0 , \\rho ^ { 2 } I _ { k d } )$ perturbation must also hold for $\\Sigma _ { W Q } { } ^ { 4 }$ . Thus, we know with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 647, + 825, + 781 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/1f3b1f5426fd1eccb343d9f5d351497230087092181b5198744cde5c888c086b.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 383, + 784, + 612, + 803 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "To prepare for the next step, we will rewrite $M ^ { W Q }$ as the product of two matrices. According to the closed form of $M _ { i j } ^ { W Q }$ in Lemma 19, we know each column of $M ^ { W Q }$ can be expressed as a linear combination of $\\widetilde { w } _ { i } \\otimes \\widetilde { w } _ { j }$ ’s and ${ \\mathrm { v e c } } ( I _ { d } )$ . Therefore: ", + "bbox": [ + 173, + 811, + 825, + 859 + ], + "page_idx": 44 + }, + { + "type": "equation", + "img_path": "images/7d38ab33af16e878b447da53e70c35a24ed8a032b9d07c0da3a94c9092491261.jpg", + "text": "$$\nM ^ { W Q } = \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R ,\n$$", + "text_format": "latex", + "bbox": [ + 382, + 863, + 616, + 890 + ], + "page_idx": 44 + }, + { + "type": "text", + "text": "where matrix $R$ has dimension $( k ^ { 2 } + 1 ) \\times ( k _ { 2 } + 1 )$ . It’s not hard to verify that ", + "bbox": [ + 171, + 102, + 692, + 119 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/5c26432d68e65ad67d2e1c95ce7b80420e2b6610ac4ad436507c6cd3dbe62e6e.jpg", + "text": "$$\n\\begin{array} { r } { \\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) \\leq \\Big \\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\Big \\| \\sigma _ { \\operatorname* { m i n } } ( R ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 326, + 125, + 669, + 152 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "Thus, ", + "bbox": [ + 173, + 159, + 214, + 172 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/8e10f34b817baf0c9b7cfecc74545bace3c8a466f6ac7fd3d5b852a27cf53d09.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\frac { \\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) } { \\left\\| \\left[ \\widetilde W ^ { \\top } \\otimes \\widetilde W ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| } .\n$$", + "text_format": "latex", + "bbox": [ + 369, + 169, + 627, + 215 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "Note that $W$ is a $k \\times d$ matrix with $\\| w _ { i } \\| \\le \\tau$ for every row vector, and $\\widetilde { W } = W Q$ , where $Q$ is an standard Gaussian matrix. Thus, similar as the proof in Lemma 22, we can show that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 219, + 825, + 265 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/22e6209952352cd619140b627511a27d194b4e1bb22caef4ce5f1bbf29111ae0.jpg", + "text": "$$\n\\begin{array} { r } { \\left\\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| \\leq \\left\\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| _ { F } \\leq \\mathrm { p o l y } ( \\tau , d ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 266, + 270, + 730, + 299 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "Thus, we know ", + "bbox": [ + 174, + 305, + 276, + 319 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/fa6b9d96fe006defb372cc7834297e55df9f8aec061c5c2088cdd89c83cf4cfb.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\operatorname { p o l y } ( 1 / \\tau , 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 398, + 318, + 598, + 335 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "Now we will try to perform the second step using the idea of subspace decoupling. Let $\\mathrm { P r o j } _ { W }$ be the projection matrix to the row span of $W$ , and let ${ \\mathrm { P r o j } } _ { W ^ { \\perp } } = I _ { d } - { \\mathrm { P r o j } } _ { W }$ . Let $\\bar { Q } \\doteq \\mathsf { P r o j } _ { W ^ { \\perp } } \\bar { Q }$ . Let the columns of $U \\in \\mathbb { R } ^ { d \\times ( d - k ) }$ be a set of orthonormal basis for the orthogonal subspace $W ^ { \\perp }$ . By symmetry of Gaussian, $\\mathrm { P r o j } _ { W } Q$ is independent with ${ \\mathrm { P r o j } } _ { W ^ { \\perp } } Q$ . Thus, from now on we will condition on ${ \\mathrm { P r o j } } _ { W } Q$ , and still treat $\\mathrm { P r o j } _ { W ^ { \\perp } } Q$ as a Gaussian random matrix. More precisely, $\\mathrm { P r o j } _ { W ^ { \\perp } } Q$ has the same distribution as $U P$ , where $P \\in \\mathbb { R } ^ { ( d - k ) \\times d }$ is a standard Gaussian matrix. ", + "bbox": [ + 173, + 344, + 826, + 434 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "We further decouple the $P$ part into two subspaces (this is done mostly to handle the special column in augmented distinguishing matrix). Let the rows of $V \\in \\mathbb { R } ^ { k \\times d }$ be a set of orthonormal basis for the row span of $\\widetilde { W } = W Q$ . And let the rows of $V ^ { \\perp } \\in \\mathbb { R } ^ { ( d - k ) \\times d }$ be a a set of orthonormal basis for the orthogonal subspace $\\widetilde { W } ^ { \\perp }$ . We can then decompose $U P$ into the row span of $V$ and $V ^ { \\perp }$ as follows, ", + "bbox": [ + 173, + 439, + 826, + 515 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/467a1b073a5a4470f45039a3f698ce94dcdf162ccb57419c82fca63431c41763.jpg", + "text": "$$\nU P \\overset { d } { = } U P _ { 1 } V ^ { \\perp } + U P _ { 2 } V ,\n$$", + "text_format": "latex", + "bbox": [ + 411, + 513, + 584, + 534 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "where $P _ { 1 } \\in \\mathbb { R } ^ { ( d - k ) \\times ( d - k ) }$ and $P _ { 2 } \\in \\mathbb { R } ^ { ( d - k ) \\times k }$ are two independent standard Gaussian matrices. After this decomposition, we have ", + "bbox": [ + 176, + 535, + 825, + 566 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/f75817f0d4763d3de96be2f25d8ab7f2ff4e9ed48a5f2dde8e2bc908a8276d4e.jpg", + "text": "$$\n\\begin{array} { r l } & { \\quad \\bar { Q } \\otimes \\bar { Q } \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { \\overset { d } { = } U P \\otimes U P \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { \\overset { d } { = } ( U P _ { 1 } V ^ { \\bot } + U P _ { 2 } V ) \\otimes ( U P _ { 1 } V ^ { \\bot } + U P _ { 2 } V ) \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { = U \\otimes U ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\otimes ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { = U \\otimes U \\left[ ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\widetilde { W } ^ { \\top } \\otimes ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) ^ { \\top } ) \\right] R } \\\\ & { = U \\otimes U \\left[ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\right] R , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 570, + 825, + 739 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "where the last equality holds because the row span of $V ^ { \\perp }$ is orthogonal to the column span of $\\widetilde { W } ^ { \\top }$ ", + "bbox": [ + 171, + 746, + 820, + 763 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "Now, we go back to matrix $M ^ { \\mathcal { D ^ { \\prime } } }$ . Let $\\operatorname { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } }$ be $\\operatorname { P r o j } _ { W ^ { \\perp } } \\otimes \\operatorname { P r o j } _ { W ^ { \\perp } }$ . We have, ", + "bbox": [ + 176, + 768, + 728, + 787 + ], + "page_idx": 45 + }, + { + "type": "equation", + "img_path": "images/e2bdd87a905316c50e646f94b7f11bbeaa752a17b4c9131a36ab742788424c7c.jpg", + "text": "$$\n\\begin{array} { r l } { \\mathsf { r } _ { \\operatorname* { m i n } } \\bigl ( M ^ { \\mathcal { D } ^ { \\prime } } \\bigr ) = \\sigma _ { \\operatorname* { m i n } } \\bigl ( ( 1 - \\lambda ) M ^ { \\mathcal { D } } + \\lambda M ^ { \\mathcal { D } _ { Q } } \\bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) M ^ { \\mathcal { D } } + \\lambda Q \\otimes Q \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { \\ge \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda \\mathbf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } Q \\otimes Q \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda \\widetilde { Q } \\otimes \\widetilde { Q } \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda U \\otimes U \\Bigl [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\Bigr ] R \\Bigr ) } & { } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 794, + 839, + 929 + ], + "page_idx": 45 + }, + { + "type": "text", + "text": "Since $R$ has full row rank, we know that the row span of $\\mathrm { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } }$ belongs to the row span of $R$ . According to the definition of $U$ , it’s also clear that the column span of $\\mathrm { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } }$ belongs to the column span of $U \\otimes U$ . Thus, there exists matrix $C \\in R ^ { ( d - k ) ^ { 2 } \\times ( k ^ { 2 } + 1 ) }$ such that ", + "bbox": [ + 173, + 102, + 825, + 154 + ], + "page_idx": 46 + }, + { + "type": "equation", + "img_path": "images/3c11d49dfbafd22a046d9194a1a6e5fa7980ca0e9fd0c253dd6a870a50bb0411.jpg", + "text": "$$\n\\mathrm { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } } = U \\otimes U C R .\n$$", + "text_format": "latex", + "bbox": [ + 390, + 159, + 606, + 179 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "Thus, ", + "bbox": [ + 173, + 184, + 214, + 199 + ], + "page_idx": 46 + }, + { + "type": "equation", + "img_path": "images/845cb895dc152d7e2f3dbbc6c0eb1f1991a495a1d7fbbc526e6ae519081c1f87.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathsf { r } _ { \\mathrm { m i n } } \\big ( M ^ { \\mathcal { D } ^ { \\prime } } \\big ) = \\sigma _ { \\mathrm { m i n } } \\big ( \\big ( 1 - \\lambda \\big ) M ^ { \\mathcal { D } } + \\lambda M ^ { \\mathcal { D } _ { Q } } \\big ) } \\\\ & { \\qquad \\ge \\sigma _ { \\mathrm { m i n } } \\bigg ( \\big ( 1 - \\lambda \\big ) \\mathsf { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } } + \\lambda U \\otimes U \\Big [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\Big ] } \\\\ & { \\qquad = \\sigma _ { \\mathrm { m i n } } \\bigg ( \\lambda U \\otimes U \\Big ( \\frac { 1 - \\lambda } { \\lambda } C + \\big [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\big ] \\Big ) R \\bigg ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 204, + 839, + 286 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "Note that $C$ only depends on $U$ and $R , U$ only depends on $W$ , and $R$ only depends on $W Q$ . With $W Q$ fixed, $C$ is also fixed. Clearly, $C$ is independent with $P _ { 1 }$ and $P _ { 2 }$ . For convenience, denote ", + "bbox": [ + 169, + 289, + 826, + 319 + ], + "page_idx": 46 + }, + { + "type": "equation", + "img_path": "images/c22d9867fe29ea401e69f54427fc49ff7bf8611c00b5a001cd745da68e751fe9.jpg", + "text": "$$\nH : = \\frac { 1 - \\lambda } { \\lambda } C + \\left[ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\right] .\n$$", + "text_format": "latex", + "bbox": [ + 287, + 324, + 710, + 356 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "Now, let’s prove that the smallest singular value of matrix $H \\in \\mathbb { R } ^ { ( d - k ) ^ { 2 } \\times ( k ^ { 2 } + 1 ) }$ is lower bounded using leave-one-out distance. Let’s first consider its submatrix $\\hat { H }$ which consists of the first $k ^ { 2 }$ columns of $H$ . Note that within random matrix $P _ { 2 } V \\widetilde { W } ^ { \\top }$ , every row are independent with each other. Within each row, the covariance matrix is $\\widetilde { W W } ^ { \\top }$ . Recall that $\\widetilde { W }$ is a random matrix whose covariance $\\Sigma _ { W Q } \\succeq \\rho ^ { 2 } I _ { k d }$ , we can again apply Claim 1 with the property proved in Lemma 37. As a result, with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 369, + 826, + 467 + ], + "page_idx": 46 + }, + { + "type": "equation", + "img_path": "images/db96c76df68772ed8c2b41b33504009098e9945bdd196599b8411970fda610c7.jpg", + "text": "$$\n\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { W } ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 411, + 473, + 584, + 493 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "Thus the covariance matrix of each row of $P _ { 2 } V \\widetilde { W } ^ { \\top }$ has smallest singular value at least $\\gamma : =$ $\\operatorname { p o l y } ( 1 / d , \\rho )$ . ", + "bbox": [ + 171, + 501, + 823, + 532 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "We can view $P _ { 2 } V \\widetilde { W } ^ { \\top }$ as the summation of two independent Gaussian matrix, one of which has covariance matrix $\\gamma I _ { ( d - k ) k }$ . For this matrix, we will do something very similar to Theorem 9 in order to lowerbound its smallest singular value. ", + "bbox": [ + 174, + 540, + 823, + 584 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "Claim 2. For a random matrix $K \\in \\mathbb { R } ^ { ( d - k ) \\times k }$ that is equal to $K ^ { o } + E$ where $E$ is a Gaussian random matrix whose entries have variance $\\gamma$ . If $d \\geq 7 k$ , for any subspace $S _ { C }$ that is independent of $K$ and has dimension at most $k ^ { 2 } + 1$ , the leave-one-out distance $d ( P r o j _ { S _ { C } ^ { \\perp } } K \\otimes K )$ is at least $p o l y ( \\gamma , 1 / d )$ . ", + "bbox": [ + 173, + 587, + 825, + 650 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "The proof idea is similar as Theorem 9, and we try to apply Lemma 31 to $K \\otimes K$ . In the proof we should think of $K : = P _ { 2 } V \\widetilde { W } ^ { \\top }$ , and denote $i$ -th column of $K$ as $K _ { i }$ . We also think of the space $S _ { C }$ as the column span of $C$ . ", + "bbox": [ + 173, + 659, + 825, + 705 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "As we did in Theorem 9, we partition $[ d - k ]$ into 2 disjoint subsets $L _ { 1 }$ and $L _ { 2 }$ of size $( d - k ) / 2$ . \nLet ${ \\hat { H } } ^ { \\prime }$ be the set of rows of $\\hat { H }$ indexed by $L _ { 1 } \\times L _ { 2 }$ . ", + "bbox": [ + 173, + 710, + 823, + 743 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "We fix a column $\\hat { H } _ { i j } ^ { \\prime }$ , $i \\neq j \\in [ k ]$ . Let $S = \\mathrm { s p a n } \\{ \\hat { H } _ { k l } ^ { \\prime } : ( k , l ) \\neq ( i , j ) \\}$ . It’s clear that $S$ is correlated with $\\hat { H } _ { i j } ^ { \\prime }$ . Let $C ^ { \\prime }$ be the set of rows of $C$ indexed by $L _ { 1 } \\times L _ { 2 }$ . Let $S _ { C ^ { \\prime } }$ be the column span of $C ^ { \\prime }$ , which has dimension at most $k ^ { 2 } + 1$ . We define the following subspace that contains $S$ , ", + "bbox": [ + 173, + 750, + 826, + 801 + ], + "page_idx": 46 + }, + { + "type": "equation", + "img_path": "images/007c938c22e7b00b2d3f763a24aef3e42ce26ef1052e562b6a15827d840a5e56.jpg", + "text": "$$\n\\hat { S } = S _ { C ^ { \\prime } } \\cup \\operatorname { s p a n } \\{ K _ { j , L _ { 1 } } \\otimes x , x \\otimes K _ { i , L _ { 2 } } , K _ { l , L _ { 1 } } \\otimes x , x \\otimes K _ { l , L _ { 2 } } \\Big | x \\in \\mathbb { R } ^ { ( d - k ) / 2 } , l \\not \\in \\{ i , j \\} \\}\n$$", + "text_format": "latex", + "bbox": [ + 207, + 808, + 790, + 834 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "Therefor by definition $S \\subset { \\hat { S } }$ , and thus $\\hat { S } ^ { \\perp } \\subset S ^ { \\perp }$ , where $S ^ { \\perp }$ denotes the orthogonal subspace of $S$ . Notice that $\\begin{array} { r } { \\hat { H } _ { i j } ^ { \\prime } = K _ { i , L _ { 1 } } \\otimes K _ { j , L _ { 2 } } + \\frac { \\lambda } { 1 - \\lambda } C _ { i j } ^ { \\prime } } \\end{array}$ is independent with $\\hat { S }$ , assuming $C$ is fixed. Moreover, $\\hat { S }$ has dimension at most ", + "bbox": [ + 173, + 842, + 825, + 892 + ], + "page_idx": 46 + }, + { + "type": "equation", + "img_path": "images/f1e2c6a6d24ff1b912bfa08be2c88f2dd906aacee85b6aae6e6f832b560a6131.jpg", + "text": "$$\n( d - k ) / 2 + ( d - k ) / 2 + ( k - 2 ) ( d - k ) / 2 + ( k - 2 ) ( d - k ) / 2 + k ^ { 2 } + 1 \\leq { \\frac { 4 } { 5 } } { \\frac { ( d - k ) ^ { 2 } } { 4 } } ,\n$$", + "text_format": "latex", + "bbox": [ + 202, + 897, + 794, + 929 + ], + "page_idx": 46 + }, + { + "type": "text", + "text": "if $k \\leq d / 7$ . Then, according to Lemma 31, we know with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 169, + 102, + 799, + 119 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/4731c8bef142dbc6cf9523169581b897c25f76ce7e79b05527e1410c81263748.jpg", + "text": "$$\n\\left\\| \\mathrm { P r o j } _ { \\hat { S } ^ { \\perp } } \\hat { H } _ { i j } ^ { \\prime } \\right\\| \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 398, + 125, + 599, + 146 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "For the column $\\hat { H } _ { i i } ^ { \\prime } , i \\in [ k ]$ , we define subspace $\\hat { S }$ slightly different, ", + "bbox": [ + 173, + 159, + 620, + 176 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/b338f60072942c029584a922020432cbc3f686c11e1f803fd6f0bc68be4d06ca.jpg", + "text": "$$\n\\hat { S } = S _ { C ^ { \\prime } } \\cup \\operatorname { s p a n } \\{ K _ { l , L _ { 1 } } \\otimes x , x \\otimes K _ { l , L _ { 2 } } \\Big | x \\in \\mathbb { R } ^ { ( d - k ) / 2 } , l \\neq i \\} .\n$$", + "text_format": "latex", + "bbox": [ + 295, + 181, + 700, + 208 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "Here the dimension of $\\hat { S }$ is also smaller than $( d - k ) ^ { 2 } / 5$ , assuming that $k \\leq d / 7$ . We can similarly show that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 215, + 825, + 247 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/956200b7cf2d97ead1bc6f8f0467f67de19a5f28fc6a76aa7ff8c1c945848859.jpg", + "text": "$$\n\\left\\| \\mathrm { P r o j } _ { \\hat { S } ^ { \\perp } } \\hat { H } _ { i i } ^ { \\prime } \\right\\| \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 398, + 252, + 598, + 273 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "Thus, by union bound, we know that the leave-one-out distance of matrix ${ \\hat { H } } ^ { \\prime }$ is lower bounded by $\\mathrm { p o l y } ( 1 / d , \\rho )$ . ", + "bbox": [ + 173, + 287, + 823, + 318 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "Now, let’s add the additional column $\\mathsf { r e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } )$ into consideration. For convenience we denote this column by $b$ . We will first prove that the vector $b$ has large norm when projected to the orthogonal subspace of columns in $\\hat { H }$ , then we will combine this with the fact that $\\sigma _ { \\mathrm { m i n } } ( { \\hat { H } } )$ is large to show that $\\sigma _ { \\mathrm { m i n } } ( H )$ is also large (this last step is very similar to Lemma 21). ", + "bbox": [ + 173, + 321, + 825, + 383 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "We know matrix $\\hat { H }$ only depends on the randomness of $P _ { 2 }$ . Thus, with $P _ { 2 }$ fixed, all columns in $H$ are fixed except for $b$ . Now, we rely on the randomness in $P _ { 1 }$ to show that the distance between $b$ and the span of other columns in $H$ is lower bounded. In order to get ride of the correlation within column $b$ , we also need to consider a subset of its rows indexed by $L _ { 1 } \\times L _ { 2 }$ , denoted by $b ^ { \\prime }$ . Let the first column of $P _ { 1 }$ be $p \\in \\mathbb { R } ^ { d - k }$ , and the submatrix consisting of other columns be $\\hat { P } _ { 1 }$ . Let $S _ { \\hat { H } ^ { \\prime } }$ be the column span of ${ \\hat { H } } ^ { \\prime }$ . Let ", + "bbox": [ + 173, + 390, + 826, + 481 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/fcb7ede60f457131802d9d05d060bb89ee3d9f5d7128602088bea5bf19cc29b6.jpg", + "text": "$$\n\\hat { S } _ { \\hat { H } ^ { \\prime } } = S _ { \\hat { H } ^ { \\prime } } \\cup S _ { C ^ { \\prime } } \\cup \\mathrm { s p a n } ( \\mathrm { v e c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } ) ^ { \\prime } , \\mathrm { v e c } ( P _ { 2 } P _ { 2 } ^ { \\top } ) ^ { \\prime } ) ,\n$$", + "text_format": "latex", + "bbox": [ + 320, + 486, + 676, + 507 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "where $\\mathsf { v e c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } ) ^ { \\prime }$ is the restriction of ve $\\mathsf { c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } )$ to the rows indexed by $L _ { 1 } \\times L _ { 2 }$ . The dimension of $\\hat { S } _ { \\hat { H } ^ { \\prime } }$ is at most $k ^ { 2 } + k ^ { 2 } + 1 + 2 \\leq ( d - k ) ^ { 2 } / 1 2$ , assuming that $k \\leq d / 7$ . Clearly, ", + "bbox": [ + 173, + 512, + 825, + 546 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/ee004e3c8ee7615c0c4b76303eb92f90b1b3ac75aeb82f154373186d62615a93.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathrm { P r o j } _ { S _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } b ^ { \\prime } \\geq \\mathrm { P r o j } _ { \\hat { S } _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } b ^ { \\prime } } \\\\ & { \\qquad = \\mathrm { P r o j } _ { \\hat { S } _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } p _ { L _ { 1 } } \\otimes p _ { L _ { 2 } } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 393, + 551, + 601, + 599 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "where $p _ { L }$ is the restriction of $p$ to rows indexed by $L$ . Note that $p _ { L _ { 1 } }$ and $p _ { L _ { 2 } }$ are two independent standard Gaussian vectors. Thus, according to Lemma 31, we know with probability at least $1 -$ $\\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , the distance between $b ^ { \\prime }$ and the column span of ${ \\hat { H } } ^ { \\prime }$ is at least poly $( 1 / d )$ . ", + "bbox": [ + 173, + 603, + 825, + 647 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "Claim 3. For any matrix $A \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } \\times k ^ { 2 } }$ and a vector $v \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } }$ , if the leave-one-out distance $d ( A ) \\geq \\delta$ , $\\| P r o j _ { A ^ { \\bot } } b \\| \\ge \\zeta$ , and $\\| v \\| \\leq C _ { 1 }$ , let $B \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } \\times ( k ^ { 2 } + 1 ) }$ ×(k2+1) be the matrix that is the concatenation of $A$ and $v$ , then the leave-one-out distance $d ( B ) \\geq p o l y ( \\zeta , \\delta , 1 / C _ { 1 } )$ . ", + "bbox": [ + 173, + 651, + 825, + 707 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "The proof idea is similar as the proof in Lemma 21. In the proof, we should think of $A : = \\hat { H } ^ { \\prime } , v : = b ^ { \\prime }$ and $B : = H ^ { \\prime }$ , where $H ^ { \\prime }$ is the subset of rows of $H$ indexed by $L _ { 1 } \\times L _ { 2 }$ . We know that $d ( { \\hat { H } } ^ { \\prime } ) \\geq$ $\\delta = \\mathrm { p o l y } ( 1 / d , \\rho ) , \\| \\mathrm { P r o j } _ { A ^ { \\perp } } b \\| \\ge \\zeta = \\mathrm { p o l y } ( 1 / d )$ . It’s not hard to show that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 718, + 825, + 780 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/fdd1156848f38c501b25f82c9387e3f0fb4b519dc81d82b45761259f44b447bd.jpg", + "text": "$$\n\\| b ^ { \\prime } \\| \\leq \\mathrm { p o l y } ( d ) .\n$$", + "text_format": "latex", + "bbox": [ + 446, + 785, + 550, + 803 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "Thus, there exists $C _ { 1 } = \\mathrm { p o l y } ( d )$ , such that $\\| b ^ { \\prime } \\| \\leq C _ { 1 }$ . We already proved that the leave-one-out distance of $b ^ { \\prime }$ in $H ^ { \\prime }$ is lower bounded. We only need to show the leave-one-out distance for the first $k ^ { 2 }$ columns, which are $\\hat { H } _ { i j } ^ { \\prime } , i , j \\in [ k ]$ . ", + "bbox": [ + 173, + 806, + 825, + 854 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "For any $i , j \\in [ k ]$ , the leave-one-out distance for $\\hat { H } _ { i j } ^ { \\prime }$ within matrix $H ^ { \\prime }$ can be expressed as follows ", + "bbox": [ + 173, + 861, + 818, + 880 + ], + "page_idx": 47 + }, + { + "type": "equation", + "img_path": "images/a9b65464e6330901fc8b16c19559eb4fe2a28efe0625305eb4d1f945235c70bd.jpg", + "text": "$$\n\\operatorname* { m i n } _ { c _ { k l } , c _ { b } } \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } b ^ { \\prime } \\|\n$$", + "text_format": "latex", + "bbox": [ + 370, + 885, + 625, + 921 + ], + "page_idx": 47 + }, + { + "type": "text", + "text": "Let $\\{ c _ { k l } ^ { * } , c _ { b } ^ { * } \\}$ be one set of the optimal solutions to $\\begin{array} { r } { \\operatorname* { m i n } _ { c _ { k l } , c _ { b } } \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } b ^ { \\prime } \\| } \\end{array}$ . If $c _ { b } ^ { * } = 0$ , we immediately have ", + "bbox": [ + 171, + 101, + 825, + 135 + ], + "page_idx": 48 + }, + { + "type": "equation", + "img_path": "images/6a537841d4647c1304d010d2d61fe1a97485f5e44754f3c229d8609376132a8c.jpg", + "text": "$$\n\\begin{array} { l } { { \\displaystyle { \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { \\ell , l } \\hat { c } _ { k l } ^ { * } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } ^ { * } b ^ { \\prime } \\| } } } \\\\ { { \\displaystyle { = \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } ^ { * } \\hat { H } _ { k l } ^ { \\prime } \\| } } } \\\\ { { \\displaystyle { \\geq \\operatorname* { m i n } _ { c _ { k l } } \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } \\hat { H } _ { k l } ^ { \\prime } \\| } } } \\\\ { { \\displaystyle { > \\delta } , } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 380, + 142, + 614, + 273 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "where the last inequality holds because the leave-one-out distance of matrix ${ \\hat { H } } ^ { \\prime }$ is lower bounded by $\\delta$ . ", + "bbox": [ + 171, + 282, + 821, + 313 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "If $c _ { b } ^ { * } \\neq 0$ , we need to be more careful. In this case, we have, ", + "bbox": [ + 173, + 318, + 570, + 334 + ], + "page_idx": 48 + }, + { + "type": "equation", + "img_path": "images/badc303e34dac2cf82fff55b324f87e70e43799f9eb5b6ea309571533a7e83f2.jpg", + "text": "$$\n\\begin{array} { r l } & { \\quad \\displaystyle { \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } ^ { * } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } ^ { * } b ^ { \\prime } \\| } } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\displaystyle \\mathrm { = } | c _ { b } ^ { * } | \\left\\| \\frac { 1 } { c _ { b } ^ { * } } \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } \\frac { c _ { k l } ^ { * } } { c _ { b } ^ { * } } \\hat { H } _ { k l } ^ { \\prime } + b ^ { \\prime } \\right\\| } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\geq | c _ { b } ^ { * } | \\zeta , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 364, + 340, + 633, + 439 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "where the last inequality holds because the distance of $b ^ { \\prime }$ to the column span of ${ \\hat { H } } ^ { \\prime }$ is lower bounded. \nIf $\\begin{array} { r } { | c _ { b } ^ { * } | \\geq \\frac { \\delta } { 2 C _ { 1 } } } \\end{array}$ , we have $\\begin{array} { r } { \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } ^ { * } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } ^ { * } b ^ { \\prime } \\| \\ge \\frac { \\delta \\zeta } { 2 C _ { 1 } } . } \\end{array}$ . ", + "bbox": [ + 176, + 449, + 821, + 484 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "$\\begin{array} { r } { | c _ { b } ^ { * } | < \\frac { \\delta } { 2 C _ { 1 } } } \\end{array}$ , we have ", + "bbox": [ + 173, + 489, + 325, + 508 + ], + "page_idx": 48 + }, + { + "type": "equation", + "img_path": "images/f5ff17adbee9e0ef9696f287239be0b63cbfa5927f90876a09d6b86a09349b23.jpg", + "text": "$$\n\\begin{array} { l } { { \\displaystyle | | \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } ^ { * } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } ^ { * } b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq | | \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } ^ { * } \\hat { H } _ { k l } ^ { \\prime } | | - | | c _ { b } ^ { * } b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq \\operatorname* { m i n } _ { c _ { k l } } | | \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } \\hat { H } _ { k l } ^ { \\prime } | | - | c _ { b } ^ { * } | | | b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq \\delta - \\frac { \\delta } { 2 C _ { 1 } } C _ { 1 } } } \\\\ { { \\displaystyle = \\delta / 2 . } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 352, + 515, + 643, + 680 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "Thus, the leave-one-out distance of $H ^ { \\prime }$ is lower bounded by $\\mathrm { p o l y } ( \\zeta , \\delta , 1 / C _ { 1 } )$ . Recall that with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , we have $\\delta = \\mathrm { p o l y } ( 1 / d , \\rho ) , \\zeta = \\mathrm { p o l y } ( 1 / d ) , C _ { 1 } = \\mathrm { p o l y } ( d )$ . Thus, we have ", + "bbox": [ + 173, + 693, + 825, + 737 + ], + "page_idx": 48 + }, + { + "type": "equation", + "img_path": "images/598d578bd74795c34e090f68428b4c79a9de0eb577d7106d68da40aab9912cba.jpg", + "text": "$$\nd ( H ^ { \\prime } ) \\geq \\operatorname { p o l y } ( 1 / d , \\rho ) .\n$$", + "text_format": "latex", + "bbox": [ + 421, + 737, + 575, + 756 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "According to Lemma 20, we have ", + "bbox": [ + 174, + 760, + 398, + 773 + ], + "page_idx": 48 + }, + { + "type": "equation", + "img_path": "images/7d55cd7ec6e39aeafa32ad88c6ae6b5f649f9b4541f5526cdf90ea30e6d72fa5.jpg", + "text": "$$\n\\begin{array} { c c c } { \\displaystyle { \\sigma _ { \\operatorname* { m i n } } ( H ^ { \\prime } ) \\geq \\frac { 1 } { \\sqrt { k ^ { 2 } + 1 } } d ( H ^ { \\prime } ) } } \\\\ { \\displaystyle { \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) . } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 405, + 781, + 593, + 834 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "Finally, we put everything together. Since $H ^ { \\prime }$ is a full column rank matrix, we know that $\\sigma _ { \\mathrm { m i n } } ( H ) \\geq$ $\\sigma _ { \\operatorname* { m i n } } ( H ^ { \\prime } ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho )$ . By union bound, we know with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 847, + 825, + 878 + ], + "page_idx": 48 + }, + { + "type": "equation", + "img_path": "images/c45958f5607d6dd36cfdb3b2d5ab9127609917aa3c7c3aa4fe87ace8f3f16b7b.jpg", + "text": "$$\n\\begin{array} { l } { \\sigma _ { \\operatorname* { m i n } } ( H ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) } \\\\ { \\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 398, + 886, + 598, + 922 + ], + "page_idx": 48 + }, + { + "type": "text", + "text": "Since $U$ is an orthonormal matrix, we know $\\sigma _ { \\mathrm { m i n } } ( U \\otimes U ) = 1$ . According to Eq. 19, we know with probability at least $1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )$ , ", + "bbox": [ + 173, + 103, + 823, + 133 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/dd4a55afb1b3eab5c3f0cb6962e6057bbf72c559c1b38a5d938add94d0d3f796.jpg", + "text": "$$\n\\begin{array} { r l } & { \\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq \\sigma _ { \\operatorname* { m i n } } ( \\lambda U \\otimes U H R ) } \\\\ & { \\qquad \\geq \\lambda \\sigma _ { \\operatorname* { m i n } } ( U \\otimes U ) \\sigma _ { \\operatorname* { m i n } } ( H ) \\sigma _ { \\operatorname* { m i n } } ( R ) } \\\\ & { \\qquad \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho , \\lambda ) } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 341, + 137, + 656, + 193 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "where the second inequality holds since all of $U \\otimes U$ , $H$ and $R$ have full column rank. ", + "bbox": [ + 176, + 194, + 740, + 210 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "D TOOLS ", + "text_level": 1, + "bbox": [ + 173, + 228, + 267, + 244 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "In this section, we collect some known results on matrix perturbations and concentration bounds. Basically, we used matrix concentration bounds to do the robust analysis and used matrix perturbation bounds to do the smoothed analysis. We also proved several corollaries that are useful in our setting. ", + "bbox": [ + 173, + 258, + 825, + 316 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "D.1 MATRIX CONCENTRATION BOUNDS ", + "text_level": 1, + "bbox": [ + 176, + 330, + 467, + 347 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Matrix concentration bounds tell us that with enough number of independent samples, the empirical mean of a random matrix can converge to the mean of this matrix. ", + "bbox": [ + 173, + 357, + 823, + 387 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Lemma 23 (Matrix Bernstein; Theorem 1.6 in Tropp (2012)). Consider a finite sequence $\\{ Z _ { k } \\}$ of independent, random matrices with dimension $d \\sb { 1 } \\times d \\sb { 2 }$ . Assume that each random matrix satisfies ", + "bbox": [ + 174, + 388, + 823, + 417 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 440, + 220, + 454 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/4364cf432fe55a9c195132ec7a45b6119cf9cfc46c65088fd4e62535ed14411f.jpg", + "text": "$$\n\\sigma ^ { 2 } : = \\operatorname* { m a x } \\Big \\{ \\big \\| \\sum _ { k } \\mathbb { E } [ Z _ { k } Z _ { k } ^ { * } ] \\big \\| , \\big \\| \\sum _ { k } \\mathbb { E } [ Z _ { k } ^ { * } Z _ { k } ] \\big \\| \\Big \\} .\n$$", + "text_format": "latex", + "bbox": [ + 334, + 452, + 661, + 487 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Then, for all $t \\geq 0$ , ", + "bbox": [ + 174, + 487, + 300, + 502 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/bc6c133d4dcec2a99381de075a95422e73ff5350555be96f5171fca65e9e08ae.jpg", + "text": "$$\n\\operatorname* { P r } \\Big \\{ \\Big \\| \\sum _ { k } Z _ { k } \\Big \\| \\geq t \\Big \\} \\leq ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { \\sigma ^ { 2 } + R t / 3 } \\Big ) .\n$$", + "text_format": "latex", + "bbox": [ + 320, + 505, + 676, + 542 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "As a corollary, we have: ", + "bbox": [ + 174, + 553, + 333, + 568 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Lemma 24. Consider a finite sequence $\\{ Z _ { 1 } , Z _ { 2 } \\cdot \\cdot \\cdot Z _ { m } \\}$ of independent, random matrices with dimension $d _ { 1 } \\times d _ { 2 }$ . Assume that each random matrix satisfies ", + "bbox": [ + 173, + 570, + 823, + 599 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/195f78f69dcdc5b153ed3af5aaa8e692c001d313315bc0db6e9d62b8f71705eb.jpg", + "text": "$$\n\\left\\| Z _ { k } \\right\\| \\le R , 1 \\le k \\le m .\n$$", + "text_format": "latex", + "bbox": [ + 416, + 602, + 580, + 618 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Then, for all $t \\geq 0$ , ", + "bbox": [ + 174, + 621, + 302, + 636 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/5ca5ee813f840411fab51b7145825f544c0b0f658487dc24880b3eae62b8eb72.jpg", + "text": "$$\n\\operatorname* { P r } \\Big \\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } - \\mathbb { E } [ Z _ { k } ] ) \\big \\| \\ge t \\Big \\} \\le ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \\Big ) .\n$$", + "text_format": "latex", + "bbox": [ + 263, + 638, + 735, + 679 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Proof. For each $k$ , let $Z _ { k } ^ { \\prime } = Z _ { k } - \\mathbb { E } [ Z _ { k } ]$ be the new random matrices. It’s clear that $\\mathbb { E } [ Z _ { k } ^ { \\prime } ] = 0$ and $\\| Z _ { k } ^ { \\prime } \\| \\leq 2 R$ . For the variance, ", + "bbox": [ + 171, + 693, + 825, + 723 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/1d94449319627579ea1774cb9d41ebce8038f654e04cec8786ab6cae6c9a0281.jpg", + "text": "$$\n\\begin{array} { r l } { \\displaystyle \\sigma ^ { 2 } \\leq \\sum _ { k = 1 } ^ { m } \\| \\mathbb { E } [ Z _ { k } ^ { \\prime } Z _ { k } ^ { \\prime * } ] \\| } & { } \\\\ { \\displaystyle \\leq \\sum _ { k = 1 } ^ { m } 4 R ^ { 2 } } & { } \\\\ { \\displaystyle = 4 m R ^ { 2 } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 424, + 724, + 571, + 829 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "Thus, according to Lemma 23, we have ", + "bbox": [ + 173, + 848, + 434, + 863 + ], + "page_idx": 49 + }, + { + "type": "equation", + "img_path": "images/b9fbc35b9449087ef7b81e32a95ff6c66a2fcb63eca75c6406d2e122ca0e83a4.jpg", + "text": "$$\n\\operatorname* { P r } \\left\\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } - \\mathbb { E } [ Z _ { k } ] ) \\big \\| \\geq t \\right\\} = \\operatorname* { P r } \\Big \\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } ^ { \\prime } ) \\big \\| \\geq t \\Big \\} \\leq ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \\Big ) .\n$$", + "text_format": "latex", + "bbox": [ + 178, + 866, + 815, + 907 + ], + "page_idx": 49 + }, + { + "type": "text", + "text": "D.2 MATRIX PERTURBATION BOUNDS ", + "text_level": 1, + "bbox": [ + 176, + 103, + 452, + 118 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Perturbation Bound for Singular Vectors For singular vectors, the perturbation is bounded by Wedin’s Theorem. ", + "bbox": [ + 171, + 128, + 823, + 159 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Lemma 25 (Wedin’s theorem; Theorem 4.1, p.260 in Stewart & Sun (1990).). Given matrices $A , E \\in \\mathbb { R } ^ { m \\times n }$ with $m \\geq n$ . Let $A$ have the singular value decomposition ", + "bbox": [ + 173, + 161, + 823, + 190 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/e646d7370e52318aa85b72e95588963f21729e24894aa17cb0035050506d0b6a.jpg", + "text": "$$\nA = [ U _ { 1 } , U _ { 2 } , U _ { 3 } ] \\left[ \\begin{array} { c c } { { \\Sigma _ { 1 } } } & { { 0 } } \\\\ { { 0 } } & { { \\Sigma _ { 2 } } } \\\\ { { 0 } } & { { 0 } } \\end{array} \\right] \\left[ V _ { 1 } , V _ { 2 } \\right] ^ { \\top }\n$$", + "text_format": "latex", + "bbox": [ + 369, + 196, + 627, + 241 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Let ${ \\hat { A } } = A + E$ , with analogous singular value decomposition. Let $\\Phi$ be the matrix of canonical angles between the column span of $U _ { 1 }$ and that of $\\hat { U } _ { 1 { : } }$ , and $\\Theta$ be the matrix of canonical angles between the column span of $V _ { 1 }$ and that of $\\hat { V } _ { 1 }$ . Suppose that there exists a $\\delta$ such that ", + "bbox": [ + 173, + 250, + 826, + 296 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/3972342c4dbeea8e4bc4026811a0ccfe8c7ef6b7f38f70702e6794b6ba82b856.jpg", + "text": "$$\n\\operatorname* { m i n } _ { i , j } | [ \\Sigma _ { 1 } ] _ { i , i } - [ \\Sigma _ { 2 } ] _ { j , j } | > \\delta a n d \\operatorname* { m i n } _ { i } | [ \\Sigma _ { 1 } ] _ { i , i } | > \\delta ,\n$$", + "text_format": "latex", + "bbox": [ + 331, + 301, + 663, + 327 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "then ", + "bbox": [ + 173, + 333, + 205, + 347 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/d7af7a7475d8dc89534cb471af334e3be467ce1374f32644ea7696838c736156.jpg", + "text": "$$\n\\| \\sin ( \\Phi ) \\| ^ { 2 } + \\| \\sin ( \\Theta ) \\| ^ { 2 } \\leq 2 \\frac { \\| E \\| ^ { 2 } } { \\delta ^ { 2 } } .\n$$", + "text_format": "latex", + "bbox": [ + 377, + 342, + 619, + 375 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "In order to show the robustness of least $k$ right singular vectors of $T$ , we combine Wedin’s theorem with the following Lemma. ", + "bbox": [ + 173, + 383, + 823, + 411 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Lemma 26 (Theorem 4.5, p.92 in Stewart & Sun (1990).). Let $\\Phi$ be the matrix of canonical angles between the column span of $U$ and that of $\\hat { U }$ , then ", + "bbox": [ + 173, + 415, + 823, + 446 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/1b6bfdcffcc4a9e0c7954aca6ab58edb68bc39da8517242fc35e92e62cfa2e28.jpg", + "text": "$$\n\\| P r o j _ { \\hat { U } } - P r o j _ { U } \\| = \\| \\sin ( \\Phi ) \\| .\n$$", + "text_format": "latex", + "bbox": [ + 395, + 452, + 602, + 470 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "The exact lemma used in our proof is the following corollary in Ge et al. (2015). ", + "bbox": [ + 173, + 482, + 700, + 498 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Lemma 27 (Lemma G.5 in Ge et al. (2015)). Given matrix $A , E \\in \\mathbb { R } ^ { m \\times n }$ with $m \\geq n$ . Suppose that the $A$ has rank $k$ . Let $s$ and $\\hat { S }$ be the subspaces spanned by the first $k$ right singular vectors of $A$ and ${ \\hat { A } } = A + E$ , respectively. Then, we have: ", + "bbox": [ + 173, + 501, + 828, + 547 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/fe302abdcad4da8a3cbe12feb3f8af1f9bf8ad9059ca5aff6d565048c24e1f00.jpg", + "text": "$$\n\\| P r o j _ { \\hat { S } ^ { \\perp } } - P r o j _ { S ^ { \\perp } } \\| \\leq \\frac { \\sqrt { 2 } \\| E \\| _ { F } } { \\sigma _ { k } ( A ) } .\n$$", + "text_format": "latex", + "bbox": [ + 385, + 554, + 612, + 589 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Perturbation Bound for pseudo-inverse With a lowerbound on $\\sigma _ { \\mathrm { m i n } } ( A )$ , we can get bounds for the perturbation of pseudo-inverse. ", + "bbox": [ + 171, + 602, + 823, + 632 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Lemma 28 (Theorem 3.4 in Stewart (1977)). Consider the perturbation of a matrix $A \\in \\mathbb { R } ^ { m \\times n }$ $B = A + E$ . Assume that rank $; ( A ) = r a n k ( B ) = n$ , then ", + "bbox": [ + 173, + 635, + 820, + 664 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/21492791b69566c8a13fb61b61ed7dd67f19aaf939548d18c92bf81b3f72d44b.jpg", + "text": "$$\n\\| B ^ { \\dagger } - A ^ { \\dagger } \\| \\leq \\sqrt { 2 } \\| A ^ { \\dagger } \\| \\| B ^ { \\dagger } \\| \\| E \\| .\n$$", + "text_format": "latex", + "bbox": [ + 383, + 670, + 612, + 690 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "The following corollary is particularly useful for us. ", + "bbox": [ + 173, + 702, + 516, + 718 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Lemma 29 (Lemma G.8 in Ge et al. (2015)). Consider the perturbation of a matrix $A \\in \\mathbb { R } ^ { m \\times n }$ : $B = A + E$ where $\\| E \\| \\le \\sigma _ { \\operatorname* { m i n } } ( A ) / 2$ . Assume that $\\cdot a n k ( A ) = r a n k ( B ) = n$ , then ", + "bbox": [ + 173, + 720, + 823, + 751 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/fe5b4078b8c89ce9aa42cc19bf9ba500b3cf541b4e15ffef653b49e6e5a5f55b.jpg", + "text": "$$\n\\| B ^ { \\dagger } - A ^ { \\dagger } \\| \\leq 2 \\sqrt { 2 } \\| E \\| / \\sigma _ { \\operatorname* { m i n } } ( A ) ^ { 2 } .\n$$", + "text_format": "latex", + "bbox": [ + 380, + 756, + 617, + 776 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Perturbation Bound for Tensor To lowerbound the leave-one-out distance in augmented distinguishing matrix , we use the following Lemma as the main tool. ", + "bbox": [ + 169, + 789, + 823, + 818 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "Lemma 30 (Theorem 3.6 in Bhaskara et al. (2014)). For any constant $\\delta \\in ( 0 , 1 )$ , given any subspace $\\nu$ of dimension √ $\\delta d ^ { l }$ in $\\mathbb { R } ^ { d ^ { l } }$ , there exist vectors $v _ { 1 } , v _ { 2 } , \\cdots , v _ { r }$ in $\\nu$ with unit norm, such that for random $( \\rho / \\sqrt { d } )$ -perturbations $\\widetilde { x } ^ { ( 1 ) } , \\widetilde { x } ^ { ( 2 ) } , \\cdot \\cdot \\cdot , \\widetilde { x } ^ { ( l ) } \\in \\mathbb { R } ^ { d }$ of any vector $x ^ { ( 1 ) } , x ^ { ( 2 ) } , \\cdot \\cdot \\cdot , x ^ { ( l ) } \\in \\mathbb { R } ^ { d }$ , we know with probability at least $1 - \\exp \\bigl ( - \\delta d ^ { 1 / ( 2 l ) ^ { l } } \\bigr )$ ), ", + "bbox": [ + 173, + 820, + 825, + 887 + ], + "page_idx": 50 + }, + { + "type": "equation", + "img_path": "images/35bf71b227265eebed9be08dc9877f64b87df5eac04bfc828956555bc547e104.jpg", + "text": "$$\n\\exists j \\in [ r ] , \\langle v _ { j } , \\widetilde { x } ^ { ( 1 ) } \\otimes \\widetilde { x } ^ { ( 2 ) } \\otimes \\cdots \\otimes \\widetilde { x } ^ { ( l ) } \\rangle \\geq \\rho ^ { l } ( \\frac { 1 } { d } ) ^ { 3 ^ { l } } .\n$$", + "text_format": "latex", + "bbox": [ + 330, + 893, + 666, + 921 + ], + "page_idx": 50 + }, + { + "type": "text", + "text": "For second-order tensor, we have the following corollary. ", + "bbox": [ + 173, + 103, + 549, + 118 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 31. For any constant $\\delta \\in ( 0 , 1 )$ , given any subspace $\\nu$ of dimension $\\delta d ^ { 2 } \\ i n \\ \\mathbb { R } ^ { d ^ { 2 } }$ , there exist vectors $v _ { 1 } , v _ { 2 } , \\cdots , v _ { r }$ in $\\nu$ with unit norm, such that for random $( \\rho / \\sqrt { d } )$ -perturbations $\\widetilde { x } ^ { ( 1 ) } , \\widetilde { x } ^ { ( 2 ) } \\in$ $\\mathbb { R } ^ { d }$ of any vector $\\boldsymbol { x } ^ { ( 1 ) } , \\boldsymbol { x } ^ { ( 2 ) } \\in \\mathbb { R } ^ { d }$ , we know with probability at least $1 - \\exp ( - \\delta d ^ { 1 / 1 6 } )$ , ", + "bbox": [ + 173, + 122, + 825, + 170 + ], + "page_idx": 51 + }, + { + "type": "equation", + "img_path": "images/00af4e51971f320a346cfa77e8a42a2b825a92c58c602e052fa056efc4291d83.jpg", + "text": "$$\n\\exists j \\in [ r ] , \\langle v _ { j } , \\widetilde { x } ^ { ( 1 ) } \\otimes \\widetilde { x } ^ { ( 2 ) } \\rangle \\geq \\rho ^ { 2 } ( \\frac { 1 } { d } ) ^ { 9 } .\n$$", + "text_format": "latex", + "bbox": [ + 372, + 172, + 622, + 202 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Perturbation Bound for Eigendecomposition Here, We restate some generic results from Bhaskara et al. (2014) on the stability of a matrix’s eigendecomposition under perturbation. Let $M$ and $\\hat { M }$ be two $n \\times n$ mtrices such that $M = U D U ^ { - 1 }$ and $\\hat { M } = M ( I + E ) + F$ . ", + "bbox": [ + 173, + 210, + 825, + 256 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Definition 3 (Definition A.1 in Bhaskara et al. (2014)). Let se $\\begin{array} { r } { p ( D ) = \\operatorname* { m i n } _ { i \\neq j } | D _ { i i } - D _ { j j } | . } \\end{array}$ . ", + "bbox": [ + 174, + 257, + 774, + 273 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "The following Lemma guarantees that the eigenvalues of $\\hat { M }$ are distinct if the perturbation are not too large. ", + "bbox": [ + 176, + 285, + 823, + 314 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 32 (Lemma A.2 in Bhaskara et al. (2014)). If $\\kappa ( U ) ( \\| M E \\| + \\| F \\| ) < s e p ( D ) / 2 n ,$ , then the eigenvalues of $\\hat { M }$ are distinct and diagonalizable. ", + "bbox": [ + 176, + 315, + 823, + 348 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "The following Lemma further upperbound the difference between corresponding eigenvectors. ", + "bbox": [ + 173, + 357, + 792, + 372 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 33 (Lemma A.3 in Bhaskara et al. (2014)). Let $u _ { 1 } , . . . , u _ { n }$ and $\\hat { u } _ { 1 } , . . . , \\hat { u } _ { n }$ respectively be the eigenvectors of $M$ and $\\hat { M }$ , ordered by their corresponding eigenvalues. If $\\kappa ( U ) ( \\| M E \\| + \\| F \\| ) <$ sep(D)/2n, then for all i we have kuˆi − uik ≤ 3 σmax(E)σmax(D)+σmax(F ) . ", + "bbox": [ + 173, + 375, + 826, + 428 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "In the setting of simultaneous diagonalization, let $N _ { a } = T _ { a } + E _ { a }$ and $N _ { b } = T _ { b } + E _ { b }$ , we have ", + "bbox": [ + 171, + 434, + 790, + 450 + ], + "page_idx": 51 + }, + { + "type": "equation", + "img_path": "images/5c9e989f923b852130721270de882117c598cb0f5e5fded9ebf693371cf48bbe.jpg", + "text": "$$\nN _ { a } N _ { b } ^ { - 1 } = T _ { a } T _ { b } ^ { - 1 } ( I + F ) + G ,\n$$", + "text_format": "latex", + "bbox": [ + 390, + 450, + 604, + 469 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "where $F = - E _ { b } ( I + T _ { b } ^ { - 1 } E _ { b } ) ^ { - 1 } T _ { b } ^ { - 1 }$ and $G = E _ { a } N _ { b } ^ { - 1 }$ . The following lemma bound the maximum singular value of perturbation matrix $F$ and $G$ . ", + "bbox": [ + 176, + 472, + 825, + 502 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 34 (Claim A.5 in Bhaskara et al. (2014)). σmax(F ) ≤ σmax(Eb)σmin(Tb)−σmax(Eb) and $\\sigma _ { \\operatorname* { m a x } } ( G ) \\leq$ $\\frac { \\sigma _ { \\operatorname* { m a x } } ( E _ { a } ) } { \\sigma _ { \\operatorname* { m i n } } ( N _ { b } ) }$ ", + "bbox": [ + 173, + 506, + 825, + 547 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Alignment of Subspace Basis. Due to the rotation issue, we cannot conclude that $\\| S - { \\hat { S } } \\|$ is small even we know $\\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\|$ is bounded. The following Lemma shows that after appropriate alignment, $S$ is indeed close to $\\hat { S }$ . ", + "bbox": [ + 173, + 563, + 826, + 611 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 35 (Lemma 6 in Ge et al. (2017a)). Given matrices $S , \\hat { S } \\in \\mathbb { R } ^ { d \\times r }$ , we have ", + "bbox": [ + 176, + 613, + 718, + 631 + ], + "page_idx": 51 + }, + { + "type": "equation", + "img_path": "images/d8cc3bace7b9a40429c1e91f75c34da0a9b0c2052c79b649c7e9e5a868e64e47.jpg", + "text": "$$\n\\operatorname* { m i n } _ { Z ^ { \\top } Z = Z Z ^ { \\top } = I _ { r } } \\| \\hat { S } - S Z \\| _ { F } ^ { 2 } \\leq \\frac { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } ^ { 2 } } { 2 ( \\sqrt { 2 } - 1 ) \\sigma _ { r } ( S S ^ { \\top } ) }\n$$", + "text_format": "latex", + "bbox": [ + 330, + 632, + 668, + 670 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "D.3 SMALLEST SINGULAR VALUE OF RANDOM MATRICES ", + "bbox": [ + 173, + 683, + 594, + 699 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "For a random rectangular matrix where each element is an inpdependent Gaussian variable, Rudelson & Vershynin (2009) gives the following result: ", + "bbox": [ + 173, + 708, + 823, + 738 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 36 (Theorem 1.1 in Rudelson & Vershynin (2009)). Let $A \\in R ^ { m \\times n }$ and suppose that $m \\geq n$ . Assume that the entries of $A$ are independent standard Gaussian variable, then for every $\\epsilon > 0$ , with probability at least $1 - ( C \\epsilon ) ^ { m - n + \\bar { 1 } } + e ^ { - C ^ { \\prime } n }$ , where $C , C ^ { \\prime }$ are two absolute constants, we have: ", + "bbox": [ + 173, + 739, + 825, + 797 + ], + "page_idx": 51 + }, + { + "type": "equation", + "img_path": "images/e272fb4b3b788a188739cac1a8807ff6ee40d6e30eefa315cdec25ad73ab61dd.jpg", + "text": "$$\n\\sigma _ { n } ( A ) \\geq \\epsilon ( { \\sqrt { m } } - { \\sqrt { n - 1 } } ) .\n$$", + "text_format": "latex", + "bbox": [ + 403, + 795, + 594, + 814 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "However, in our setting, we are more interested in fixed matrices perturbed by Gaussian variables. \nThe smallest singular value of these “perturbed rectangular matrices” can be bounded as follows. ", + "bbox": [ + 173, + 821, + 823, + 849 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "Lemma 37 (Lemma G.16 in Ge et al. (2015)). Let $A \\in \\mathbb { R } ^ { m \\times n }$ and suppose that $m \\geq 3 n$ . If all the entries of $A$ are independently $\\rho$ -perturbed to yield $\\widetilde { A }$ , then for any $\\epsilon > 0$ , with probability at least $1 - ( C \\epsilon ) ^ { 0 . 2 5 m }$ , for some absolute constant $C$ , the smallest singular value of $\\widetilde { A }$ is bounded below by: ", + "bbox": [ + 173, + 852, + 825, + 900 + ], + "page_idx": 51 + }, + { + "type": "equation", + "img_path": "images/20ce9343b2edb1fb4d5fe04792c4888fce8eb8b3d4d30a663ee0f3d4ea7468d0.jpg", + "text": "$$\n\\sigma _ { n } ( { \\widetilde { A } } ) \\geq \\epsilon \\rho { \\sqrt { m } } .\n$$", + "text_format": "latex", + "bbox": [ + 441, + 902, + 553, + 921 + ], + "page_idx": 51 + }, + { + "type": "text", + "text": "D.4 ANTI-CONCENTRATION ", + "text_level": 1, + "bbox": [ + 174, + 103, + 383, + 118 + ], + "page_idx": 52 + }, + { + "type": "text", + "text": "We use the anti-concentration property for Gaussian random variables in our proof of Lemma 17. Lemma 38 (Anti-concentration in Carbery & Wright (2001)). Let $x \\in \\mathbb { R } ^ { n }$ be a Gaussian variable $x \\in N ( 0 , I )$ , for any polynomial $p ( x )$ of degree $d$ , there exists a constant $\\kappa$ such that ", + "bbox": [ + 169, + 128, + 825, + 178 + ], + "page_idx": 52 + }, + { + "type": "equation", + "img_path": "images/67e315d487a08a0312f4ddd20f49a308a1c9f9a8ae33f285c6349d680a787c4b.jpg", + "text": "$$\n\\begin{array} { r } { \\operatorname* { P r } \\left[ | p ( x ) | \\leq \\epsilon \\sqrt { V a r [ p ( x ) ] } \\right] \\leq \\kappa \\epsilon ^ { 1 / d } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 370, + 184, + 625, + 205 + ], + "page_idx": 52 + } +] \ No newline at end of file diff --git a/parse/train/H1xipsA5K7/H1xipsA5K7_middle.json b/parse/train/H1xipsA5K7/H1xipsA5K7_middle.json new file mode 100644 index 0000000000000000000000000000000000000000..e610a4045955c1fd9efe0ccc3e34bfb3f5e4d81a --- /dev/null +++ b/parse/train/H1xipsA5K7/H1xipsA5K7_middle.json @@ -0,0 +1,202853 @@ +{ + "pdf_info": [ + 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Although the network only has two", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 200, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 200, + 505, + 213 + ], + "score": 1.0, + "content": "layers, learning similar networks is far from trivial: even when the input distribution is Gaussian,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 212, + 505, + 224 + ], + "spans": [ + { + "bbox": [ + 105, + 212, + 505, + 224 + ], + "score": 1.0, + "content": "Ge et al. (2017b) and Safran & Shamir (2018) showed that standard optimization objective can have", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 223, + 505, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 505, + 235 + ], + "score": 1.0, + "content": "bad local optimal solutions. Ge et al. (2017b) gave a new and more complicated objective function", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 234, + 255, + 245 + ], + "spans": [ + { + "bbox": [ + 105, + 234, + 255, + 245 + ], + "score": 1.0, + "content": "that does not have bad local minima.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 250, + 505, + 349 + ], + "lines": [ + { + "bbox": [ + 105, + 249, + 506, + 263 + ], + "spans": [ + { + "bbox": [ + 105, + 249, + 206, + 263 + ], + "score": 1.0, + "content": "For the input distribution", + "type": "text" + }, + { + "bbox": [ + 207, + 251, + 215, + 261 + ], + "score": 0.79, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 249, + 329, + 263 + ], + "score": 1.0, + "content": ", our only requirement is that", + "type": "text" + }, + { + "bbox": [ + 329, + 251, + 338, + 261 + ], + "score": 0.81, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 249, + 456, + 263 + ], + "score": 1.0, + "content": "is symmetric. That is, for any", + "type": "text" + }, + { + "bbox": [ + 456, + 250, + 487, + 261 + ], + "score": 0.91, + "content": "x \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 249, + 506, + 263 + ], + "score": 1.0, + "content": ", the", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 262, + 505, + 273 + ], + "spans": [ + { + "bbox": [ + 106, + 262, + 205, + 273 + ], + "score": 1.0, + "content": "probability of observing", + "type": "text" + }, + { + "bbox": [ + 206, + 262, + 235, + 272 + ], + "score": 0.9, + "content": "x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 235, + 262, + 409, + 273 + ], + "score": 1.0, + "content": "is the same as the probability of observing", + "type": "text" + }, + { + "bbox": [ + 409, + 262, + 446, + 272 + ], + "score": 0.91, + "content": "- x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 262, + 505, + 273 + ], + "score": 1.0, + "content": ". A symmetric", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 271, + 505, + 285 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 505, + 285 + ], + "score": 1.0, + "content": "distribution can still be very complicated and cannot be represented by a finite number of parameters.", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 282, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 104, + 282, + 408, + 297 + ], + "score": 1.0, + "content": "In practice, one can often think of the symmetry requirement as a “factor-", + "type": "text" + }, + { + "bbox": [ + 408, + 284, + 420, + 294 + ], + "score": 0.53, + "content": "2 ^ { \\circ }", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 282, + 506, + 297 + ], + "score": 1.0, + "content": "approximation to an", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 294, + 506, + 307 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 506, + 307 + ], + "score": 1.0, + "content": "arbitrary input distribution: if we have arbitrary training samples, it is possible to augment the input", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 304, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 105, + 304, + 505, + 318 + ], + "score": 1.0, + "content": "data with their negations to make the input distribution symmetric, and it should take at most twice", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 315, + 505, + 329 + ], + "spans": [ + { + "bbox": [ + 105, + 315, + 505, + 329 + ], + "score": 1.0, + "content": "the effort in labeling both the original and augmented data. In many cases (such as images) the", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 326, + 506, + 340 + ], + "spans": [ + { + "bbox": [ + 104, + 326, + 506, + 340 + ], + "score": 1.0, + "content": "augmented data can be interpreted (for images it will just be negated colors) so reasonable labels", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 338, + 174, + 350 + ], + "spans": [ + { + "bbox": [ + 106, + 338, + 174, + 350 + ], + "score": 1.0, + "content": "can be obtained.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 17 + }, + { + "type": "title", + "bbox": [ + 108, + 362, + 192, + 373 + ], + "lines": [ + { + "bbox": [ + 105, + 361, + 194, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 361, + 194, + 375 + ], + "score": 1.0, + "content": "1.1 OUR RESULTS", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 22 + }, + { + "type": "text", + "bbox": [ + 107, + 383, + 505, + 427 + ], + "lines": [ + { + "bbox": [ + 105, + 383, + 505, + 395 + ], + "spans": [ + { + "bbox": [ + 105, + 383, + 505, + 395 + ], + "score": 1.0, + "content": "When the input distribution is symmetric, we give the first algorithm that can learn a two-layer", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 394, + 505, + 406 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 505, + 406 + ], + "score": 1.0, + "content": "neural network. Our algorithm is based on the method-of-moments approach: first estimate some", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 105, + 405, + 193, + 417 + ], + "score": 1.0, + "content": "correlations between", + "type": "text" + }, + { + "bbox": [ + 193, + 407, + 200, + 415 + ], + "score": 0.73, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 405, + 219, + 417 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 220, + 407, + 226, + 417 + ], + "score": 0.76, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 405, + 505, + 417 + ], + "score": 1.0, + "content": ", then use these information to recover the model parameters. More", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 416, + 181, + 428 + ], + "spans": [ + { + "bbox": [ + 105, + 416, + 181, + 428 + ], + "score": 1.0, + "content": "precisely we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5 + }, + { + "type": "text", + "bbox": [ + 107, + 429, + 505, + 489 + ], + "lines": [ + { + "bbox": [ + 105, + 429, + 505, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 429, + 505, + 442 + ], + "score": 1.0, + "content": "Theorem 1 (informal). If the data is generated according to Equation (1), and the input distribution", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 440, + 507, + 454 + ], + "spans": [ + { + "bbox": [ + 106, + 441, + 135, + 451 + ], + "score": 0.89, + "content": "x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 440, + 326, + 454 + ], + "score": 1.0, + "content": "is symmetric. Given exact correlations between", + "type": "text" + }, + { + "bbox": [ + 326, + 443, + 343, + 452 + ], + "score": 0.52, + "content": "x , y", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 440, + 462, + 454 + ], + "score": 1.0, + "content": "of order at most 4, as long as", + "type": "text" + }, + { + "bbox": [ + 463, + 441, + 486, + 452 + ], + "score": 0.52, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 440, + 507, + 454 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 452, + 505, + 464 + ], + "spans": [ + { + "bbox": [ + 106, + 452, + 400, + 464 + ], + "score": 1.0, + "content": "input distribution are not degenerate, there is an algorithm that runs in", + "type": "text" + }, + { + "bbox": [ + 401, + 452, + 433, + 464 + ], + "score": 0.29, + "content": "p o l y ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 452, + 505, + 464 + ], + "score": 1.0, + "content": "time and outputs", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 462, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 463, + 149, + 478 + ], + "score": 1.0, + "content": "a network", + "type": "text" + }, + { + "bbox": [ + 150, + 462, + 174, + 475 + ], + "score": 0.84, + "content": "{ \\hat { A } } , { \\hat { W } }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 463, + 505, + 478 + ], + "score": 1.0, + "content": "of the same size that is effectively the same as the ground-truth network: for any", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 475, + 234, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 129, + 490 + ], + "score": 1.0, + "content": "input", + "type": "text" + }, + { + "bbox": [ + 129, + 479, + 136, + 487 + ], + "score": 0.32, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 477, + 140, + 490 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 140, + 475, + 230, + 489 + ], + "score": 0.92, + "content": "\\hat { A } \\sigma ( \\hat { W } x ) = A \\sigma ( W x )", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 477, + 234, + 490 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 106, + 496, + 504, + 519 + ], + "lines": [ + { + "bbox": [ + 106, + 496, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 496, + 291, + 509 + ], + "score": 1.0, + "content": "Of course, in practice we only have samples of", + "type": "text" + }, + { + "bbox": [ + 291, + 497, + 315, + 509 + ], + "score": 0.92, + "content": "( x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 496, + 505, + 509 + ], + "score": 1.0, + "content": "and cannot get the exact correlations. However,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 507, + 505, + 520 + ], + "spans": [ + { + "bbox": [ + 106, + 507, + 505, + 520 + ], + "score": 1.0, + "content": "our algorithm is robust to perturbations, and in particular can work with polynomially many samples.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5 + }, + { + "type": "text", + "bbox": [ + 107, + 521, + 505, + 581 + ], + "lines": [ + { + "bbox": [ + 105, + 520, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 505, + 534 + ], + "score": 1.0, + "content": "Theorem 2 (informal). If the data is generated according to Equation (1), and the input distribution", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 532, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 106, + 533, + 135, + 542 + ], + "score": 0.89, + "content": "x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 532, + 311, + 545 + ], + "score": 1.0, + "content": "is symmetric. As long as the weight matrices", + "type": "text" + }, + { + "bbox": [ + 311, + 532, + 335, + 543 + ], + "score": 0.3, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 532, + 505, + 545 + ], + "score": 1.0, + "content": "and input distributions are not degenerate,", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 542, + 506, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 255, + 556 + ], + "score": 1.0, + "content": "there is an algorithm that uses poly", + "type": "text" + }, + { + "bbox": [ + 255, + 543, + 287, + 555 + ], + "score": 0.86, + "content": "( d , 1 / \\epsilon )", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 542, + 506, + 556 + ], + "score": 1.0, + "content": "time and number of samples and outputs a network", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 554, + 506, + 570 + ], + "spans": [ + { + "bbox": [ + 106, + 554, + 131, + 567 + ], + "score": 0.88, + "content": "{ \\hat { A } } , { \\hat { W } }", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 554, + 506, + 570 + ], + "score": 1.0, + "content": "of the same size that computes an \u000f-approximation function to the ground-truth network: for", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 567, + 282, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 567, + 146, + 581 + ], + "score": 1.0, + "content": "any input", + "type": "text" + }, + { + "bbox": [ + 146, + 571, + 153, + 578 + ], + "score": 0.47, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 567, + 157, + 581 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 158, + 567, + 279, + 581 + ], + "score": 0.93, + "content": "\\| \\hat { A } \\sigma ( \\hat { W } x ) - A \\sigma ( W x ) \\| ^ { 2 } \\leq \\epsilon .", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 567, + 282, + 581 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 36 + }, + { + "type": "text", + "bbox": [ + 106, + 588, + 505, + 633 + ], + "lines": [ + { + "bbox": [ + 105, + 588, + 506, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 588, + 327, + 601 + ], + "score": 1.0, + "content": "In fact, the algorithm recovers the original parameters", + "type": "text" + }, + { + "bbox": [ + 327, + 588, + 351, + 600 + ], + "score": 0.89, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 588, + 506, + 601 + ], + "score": 1.0, + "content": "up to scaling and permutations. Here", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 599, + 505, + 612 + ], + "spans": [ + { + "bbox": [ + 105, + 599, + 420, + 612 + ], + "score": 1.0, + "content": "when we say weight matrices are not degenerate, we mean that the matrices", + "type": "text" + }, + { + "bbox": [ + 420, + 599, + 444, + 610 + ], + "score": 0.85, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 599, + 505, + 612 + ], + "score": 1.0, + "content": "should be full", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 610, + 505, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 505, + 622 + ], + "score": 1.0, + "content": "rank, and in addition a certain distinguishing matrix that we define later in Section 2 is also full rank.", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 621, + 491, + 634 + ], + "spans": [ + { + "bbox": [ + 106, + 621, + 491, + 634 + ], + "score": 1.0, + "content": "We justify these assumptions using the smoothed analysis framework (Spielman & Teng, 2004).", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 40.5 + }, + { + "type": "text", + "bbox": [ + 106, + 637, + 505, + 704 + ], + "lines": [ + { + "bbox": [ + 105, + 637, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 505, + 651 + ], + "score": 1.0, + "content": "In smoothed analysis, the input is not purely controlled by an adversary. Instead, the adversary can", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 649, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 106, + 649, + 397, + 662 + ], + "score": 1.0, + "content": "first generate an arbitrary instance (in our case, arbitrary weight matrices", + "type": "text" + }, + { + "bbox": [ + 397, + 649, + 420, + 660 + ], + "score": 0.36, + "content": "W , A", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 649, + 506, + 662 + ], + "score": 1.0, + "content": "and symmetric input", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 659, + 506, + 672 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 154, + 672 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 155, + 660, + 164, + 670 + ], + "score": 0.75, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 164, + 659, + 506, + 672 + ], + "score": 1.0, + "content": "), and the parameters for this instance will be randomly perturbed to yield a perturbed", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 671, + 504, + 683 + ], + "spans": [ + { + "bbox": [ + 106, + 671, + 504, + 683 + ], + "score": 1.0, + "content": "instance. The algorithm only needs to work with high probability on the perturbed instance. This", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 104, + 680, + 506, + 696 + ], + "spans": [ + { + "bbox": [ + 104, + 680, + 506, + 696 + ], + "score": 1.0, + "content": "limits the power of the adversary and prevents it from creating highly degenerate cases (e.g. choosing", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 693, + 427, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 693, + 299, + 705 + ], + "score": 1.0, + "content": "the weight matrices to be much lower rank than", + "type": "text" + }, + { + "bbox": [ + 299, + 695, + 305, + 703 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 693, + 427, + 705 + ], + "score": 1.0, + "content": "). 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The function", + "type": "text" + }, + { + "bbox": [ + 487, + 170, + 494, + 178 + ], + "score": 0.78, + "content": "\\sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 165, + 507, + 181 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 178, + 505, + 191 + ], + "spans": [ + { + "bbox": [ + 105, + 178, + 261, + 191 + ], + "score": 1.0, + "content": "the standard ReLU activation function", + "type": "text" + }, + { + "bbox": [ + 261, + 179, + 338, + 191 + ], + "score": 0.91, + "content": "\\sigma ( x ) = \\operatorname* { m a x } \\{ x , 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 178, + 466, + 191 + ], + "score": 1.0, + "content": "applied entry-wise to the vector", + "type": "text" + }, + { + "bbox": [ + 467, + 179, + 484, + 189 + ], + "score": 0.86, + "content": "W x", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 178, + 505, + 191 + ], + "score": 1.0, + "content": ", and", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 190, + 506, + 203 + ], + "spans": [ + { + "bbox": [ + 106, + 190, + 113, + 201 + ], + "score": 0.81, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 113, + 190, + 217, + 203 + ], + "score": 1.0, + "content": "is a noise vector that has", + "type": "text" + }, + { + "bbox": [ + 217, + 190, + 255, + 202 + ], + "score": 0.92, + "content": "\\mathbb { E } [ \\xi ] = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 190, + 347, + 203 + ], + "score": 1.0, + "content": "and is independent of", + "type": "text" + }, + { + "bbox": [ + 347, + 192, + 354, + 200 + ], + "score": 0.74, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 190, + 506, + 203 + ], + "score": 1.0, + "content": ". Although the network only has two", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 200, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 200, + 505, + 213 + ], + "score": 1.0, + "content": "layers, learning similar networks is far from trivial: even when the input distribution is Gaussian,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 212, + 505, + 224 + ], + "spans": [ + { + "bbox": [ + 105, + 212, + 505, + 224 + ], + "score": 1.0, + "content": "Ge et al. (2017b) and Safran & Shamir (2018) showed that standard optimization objective can have", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 223, + 505, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 505, + 235 + ], + "score": 1.0, + "content": "bad local optimal solutions. Ge et al. 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Our algorithm is based on the method-of-moments approach: first estimate some", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 105, + 405, + 193, + 417 + ], + "score": 1.0, + "content": "correlations between", + "type": "text" + }, + { + "bbox": [ + 193, + 407, + 200, + 415 + ], + "score": 0.73, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 405, + 219, + 417 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 220, + 407, + 226, + 417 + ], + "score": 0.76, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 405, + 505, + 417 + ], + "score": 1.0, + "content": ", then use these information to recover the model parameters. More", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 416, + 181, + 428 + ], + "spans": [ + { + "bbox": [ + 105, + 416, + 181, + 428 + ], + "score": 1.0, + "content": "precisely we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5, + "bbox_fs": [ + 105, + 383, + 505, + 428 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 429, + 505, + 489 + ], + "lines": [ + { + "bbox": [ + 105, + 429, + 505, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 429, + 505, + 442 + ], + "score": 1.0, + "content": "Theorem 1 (informal). If the data is generated according to Equation (1), and the input distribution", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 440, + 507, + 454 + ], + "spans": [ + { + "bbox": [ + 106, + 441, + 135, + 451 + ], + "score": 0.89, + "content": "x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 440, + 326, + 454 + ], + "score": 1.0, + "content": "is symmetric. Given exact correlations between", + "type": "text" + }, + { + "bbox": [ + 326, + 443, + 343, + 452 + ], + "score": 0.52, + "content": "x , y", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 440, + 462, + 454 + ], + "score": 1.0, + "content": "of order at most 4, as long as", + "type": "text" + }, + { + "bbox": [ + 463, + 441, + 486, + 452 + ], + "score": 0.52, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 440, + 507, + 454 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 452, + 505, + 464 + ], + "spans": [ + { + "bbox": [ + 106, + 452, + 400, + 464 + ], + "score": 1.0, + "content": "input distribution are not degenerate, there is an algorithm that runs in", + "type": "text" + }, + { + "bbox": [ + 401, + 452, + 433, + 464 + ], + "score": 0.29, + "content": "p o l y ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 452, + 505, + 464 + ], + "score": 1.0, + "content": "time and outputs", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 462, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 463, + 149, + 478 + ], + "score": 1.0, + "content": "a network", + "type": "text" + }, + { + "bbox": [ + 150, + 462, + 174, + 475 + ], + "score": 0.84, + "content": "{ \\hat { A } } , { \\hat { W } }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 463, + 505, + 478 + ], + "score": 1.0, + "content": "of the same size that is effectively the same as the ground-truth network: for any", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 475, + 234, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 129, + 490 + ], + "score": 1.0, + "content": "input", + "type": "text" + }, + { + "bbox": [ + 129, + 479, + 136, + 487 + ], + "score": 0.32, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 477, + 140, + 490 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 140, + 475, + 230, + 489 + ], + "score": 0.92, + "content": "\\hat { A } \\sigma ( \\hat { W } x ) = A \\sigma ( W x )", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 477, + 234, + 490 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 29, + "bbox_fs": [ + 105, + 429, + 507, + 490 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 496, + 504, + 519 + ], + "lines": [ + { + "bbox": [ + 106, + 496, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 496, + 291, + 509 + ], + "score": 1.0, + "content": "Of course, in practice we only have samples of", + "type": "text" + }, + { + "bbox": [ + 291, + 497, + 315, + 509 + ], + "score": 0.92, + "content": "( x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 496, + 505, + 509 + ], + "score": 1.0, + "content": "and cannot get the exact correlations. However,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 507, + 505, + 520 + ], + "spans": [ + { + "bbox": [ + 106, + 507, + 505, + 520 + ], + "score": 1.0, + "content": "our algorithm is robust to perturbations, and in particular can work with polynomially many samples.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5, + "bbox_fs": [ + 106, + 496, + 505, + 520 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 521, + 505, + 581 + ], + "lines": [ + { + "bbox": [ + 105, + 520, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 505, + 534 + ], + "score": 1.0, + "content": "Theorem 2 (informal). If the data is generated according to Equation (1), and the input distribution", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 532, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 106, + 533, + 135, + 542 + ], + "score": 0.89, + "content": "x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 532, + 311, + 545 + ], + "score": 1.0, + "content": "is symmetric. As long as the weight matrices", + "type": "text" + }, + { + "bbox": [ + 311, + 532, + 335, + 543 + ], + "score": 0.3, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 532, + 505, + 545 + ], + "score": 1.0, + "content": "and input distributions are not degenerate,", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 542, + 506, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 255, + 556 + ], + "score": 1.0, + "content": "there is an algorithm that uses poly", + "type": "text" + }, + { + "bbox": [ + 255, + 543, + 287, + 555 + ], + "score": 0.86, + "content": "( d , 1 / \\epsilon )", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 542, + 506, + 556 + ], + "score": 1.0, + "content": "time and number of samples and outputs a network", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 554, + 506, + 570 + ], + "spans": [ + { + "bbox": [ + 106, + 554, + 131, + 567 + ], + "score": 0.88, + "content": "{ \\hat { A } } , { \\hat { W } }", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 554, + 506, + 570 + ], + "score": 1.0, + "content": "of the same size that computes an \u000f-approximation function to the ground-truth network: for", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 567, + 282, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 567, + 146, + 581 + ], + "score": 1.0, + "content": "any input", + "type": "text" + }, + { + "bbox": [ + 146, + 571, + 153, + 578 + ], + "score": 0.47, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 567, + 157, + 581 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 158, + 567, + 279, + 581 + ], + "score": 0.93, + "content": "\\| \\hat { A } \\sigma ( \\hat { W } x ) - A \\sigma ( W x ) \\| ^ { 2 } \\leq \\epsilon .", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 567, + 282, + 581 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 36, + "bbox_fs": [ + 105, + 520, + 506, + 581 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 588, + 505, + 633 + ], + "lines": [ + { + "bbox": [ + 105, + 588, + 506, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 588, + 327, + 601 + ], + "score": 1.0, + "content": "In fact, the algorithm recovers the original parameters", + "type": "text" + }, + { + "bbox": [ + 327, + 588, + 351, + 600 + ], + "score": 0.89, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 588, + 506, + 601 + ], + "score": 1.0, + "content": "up to scaling and permutations. Here", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 599, + 505, + 612 + ], + "spans": [ + { + "bbox": [ + 105, + 599, + 420, + 612 + ], + "score": 1.0, + "content": "when we say weight matrices are not degenerate, we mean that the matrices", + "type": "text" + }, + { + "bbox": [ + 420, + 599, + 444, + 610 + ], + "score": 0.85, + "content": "A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 599, + 505, + 612 + ], + "score": 1.0, + "content": "should be full", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 610, + 505, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 505, + 622 + ], + "score": 1.0, + "content": "rank, and in addition a certain distinguishing matrix that we define later in Section 2 is also full rank.", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 621, + 491, + 634 + ], + "spans": [ + { + "bbox": [ + 106, + 621, + 491, + 634 + ], + "score": 1.0, + "content": "We justify these assumptions using the smoothed analysis framework (Spielman & Teng, 2004).", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 40.5, + "bbox_fs": [ + 105, + 588, + 506, + 634 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 637, + 505, + 704 + ], + "lines": [ + { + "bbox": [ + 105, + 637, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 505, + 651 + ], + "score": 1.0, + "content": "In smoothed analysis, the input is not purely controlled by an adversary. Instead, the adversary can", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 649, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 106, + 649, + 397, + 662 + ], + "score": 1.0, + "content": "first generate an arbitrary instance (in our case, arbitrary weight matrices", + "type": "text" + }, + { + "bbox": [ + 397, + 649, + 420, + 660 + ], + "score": 0.36, + "content": "W , A", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 649, + 506, + 662 + ], + "score": 1.0, + "content": "and symmetric input", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 659, + 506, + 672 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 154, + 672 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 155, + 660, + 164, + 670 + ], + "score": 0.75, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 164, + 659, + 506, + 672 + ], + "score": 1.0, + "content": "), and the parameters for this instance will be randomly perturbed to yield a perturbed", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 671, + 504, + 683 + ], + "spans": [ + { + "bbox": [ + 106, + 671, + 504, + 683 + ], + "score": 1.0, + "content": "instance. The algorithm only needs to work with high probability on the perturbed instance. This", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 104, + 680, + 506, + 696 + ], + "spans": [ + { + "bbox": [ + 104, + 680, + 506, + 696 + ], + "score": 1.0, + "content": "limits the power of the adversary and prevents it from creating highly degenerate cases (e.g. choosing", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 693, + 427, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 693, + 299, + 705 + ], + "score": 1.0, + "content": "the weight matrices to be much lower rank than", + "type": "text" + }, + { + "bbox": [ + 299, + 695, + 305, + 703 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 693, + 427, + 705 + ], + "score": 1.0, + "content": "). Roughly speaking, we show", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 45.5, + "bbox_fs": [ + 104, + 637, + 506, + 705 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 504, + 127 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 425, + 95 + ], + "score": 1.0, + "content": "Theorem 3 (informal). There is a simple way to perturb the input distribution,", + "type": "text" + }, + { + "bbox": [ + 425, + 83, + 438, + 93 + ], + "score": 0.43, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 81, + 456, + 95 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 456, + 83, + 465, + 92 + ], + "score": 0.53, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 465, + 81, + 506, + 95 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "score": 1.0, + "content": "with high probability, the distance between the perturbed instance and original instance is at most", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 104, + 503, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 115, + 115 + ], + "score": 0.63, + "content": "\\lambda ,", + "type": "inline_equation" + }, + { + "bbox": [ + 115, + 105, + 451, + 117 + ], + "score": 1.0, + "content": ", and our algorithm outputs an \u000f-approximation to the perturbed network with poly", + "type": "text" + }, + { + "bbox": [ + 452, + 104, + 503, + 117 + ], + "score": 0.89, + "content": "( d , 1 / \\lambda , 1 / \\epsilon )", + "type": "inline_equation" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 116, + 223, + 128 + ], + "spans": [ + { + "bbox": [ + 106, + 116, + 223, + 128 + ], + "score": 1.0, + "content": "time and number of samples.", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5 + }, + { + "type": "text", + "bbox": [ + 107, + 140, + 505, + 217 + ], + "lines": [ + { + "bbox": [ + 106, + 141, + 504, + 152 + ], + "spans": [ + { + "bbox": [ + 106, + 141, + 504, + 152 + ], + "score": 1.0, + "content": "In the rest of the paper, we will first review related works. Then in Section 2 we formally define", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 151, + 506, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 506, + 163 + ], + "score": 1.0, + "content": "the network and introduce some notations. Our algorithm is given in Section 3. Finally in Section 4", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 162, + 505, + 174 + ], + "spans": [ + { + "bbox": [ + 105, + 162, + 505, + 174 + ], + "score": 1.0, + "content": "we run experiments to show that the algorithm can indeed learn the two-layer network efficiently", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 173, + 505, + 185 + ], + "spans": [ + { + "bbox": [ + 106, + 173, + 505, + 185 + ], + "score": 1.0, + "content": "and robustly. The experiments show that our algorithm works robustly with reasonable number of", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 184, + 505, + 197 + ], + "spans": [ + { + "bbox": [ + 105, + 184, + 505, + 197 + ], + "score": 1.0, + "content": "samples for different (symmetric) input distributions and weight matrices. Due to space constraints,", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 195, + 505, + 207 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 505, + 207 + ], + "score": 1.0, + "content": "the proof for polynomial number of samples (Theorem 2) and smoothed analysis (Theorem 3) are", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 205, + 209, + 219 + ], + "spans": [ + { + "bbox": [ + 105, + 205, + 209, + 219 + ], + "score": 1.0, + "content": "deferred to the appendix.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 7 + }, + { + "type": "title", + "bbox": [ + 108, + 239, + 202, + 250 + ], + "lines": [ + { + "bbox": [ + 106, + 238, + 205, + 252 + ], + "spans": [ + { + "bbox": [ + 106, + 238, + 205, + 252 + ], + "score": 1.0, + "content": "1.2 RELATED WORK", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 263, + 470, + 275 + ], + "lines": [ + { + "bbox": [ + 105, + 262, + 472, + 277 + ], + "spans": [ + { + "bbox": [ + 105, + 262, + 472, + 277 + ], + "score": 1.0, + "content": "There are many works in learning neural networks, and they come in many different styles.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 107, + 295, + 504, + 351 + ], + "lines": [ + { + "bbox": [ + 105, + 295, + 505, + 307 + ], + "spans": [ + { + "bbox": [ + 105, + 295, + 505, + 307 + ], + "score": 1.0, + "content": "Non-standard Networks Some works focus on networks that do not use standard activation func-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 306, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 106, + 306, + 505, + 318 + ], + "score": 1.0, + "content": "tions. Arora et al. (2014) gave an algorithm that learns a network with discrete variables. Livni", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 317, + 506, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 317, + 506, + 331 + ], + "score": 1.0, + "content": "et al. (2014) and follow-up works learn neural networks with polynomial activation functions. Oy-", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 326, + 506, + 343 + ], + "spans": [ + { + "bbox": [ + 104, + 326, + 506, + 343 + ], + "score": 1.0, + "content": "mak & Soltanolkotabi (2018) used the rank-1 tensor decomposition for learning a non-overlapping", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 339, + 472, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 472, + 352 + ], + "score": 1.0, + "content": "convolutional neural network with differentiable and smooth activation and Gaussian input.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 107, + 364, + 505, + 420 + ], + "lines": [ + { + "bbox": [ + 105, + 363, + 506, + 377 + ], + "spans": [ + { + "bbox": [ + 105, + 363, + 506, + 377 + ], + "score": 1.0, + "content": "ReLU network, Gaussian input When the input is Gaussian, Ge et al. (2017b) showed that for a", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 374, + 505, + 389 + ], + "spans": [ + { + "bbox": [ + 105, + 374, + 505, + 389 + ], + "score": 1.0, + "content": "two-layer neural network, although the standard objective does have bad local optimal solutions, one", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 386, + 505, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 386, + 505, + 399 + ], + "score": 1.0, + "content": "can construct a new objective whose local optima are all globally optimal. Several other works (Tian,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 395, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 395, + 506, + 411 + ], + "score": 1.0, + "content": "2017; Du et al., 2017b; Brutzkus & Globerson, 2017; Li & Yuan, 2017; Soltanolkotabi, 2017; Zhong", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 407, + 362, + 422 + ], + "spans": [ + { + "bbox": [ + 105, + 407, + 362, + 422 + ], + "score": 1.0, + "content": "et al., 2017; Zhang et al., 2018) extend this to different settings.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 107, + 433, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 106, + 434, + 505, + 445 + ], + "spans": [ + { + "bbox": [ + 106, + 434, + 505, + 445 + ], + "score": 1.0, + "content": "General input with score functions A closely related work (Janzamin et al., 2015) does not", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 445, + 504, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 445, + 504, + 456 + ], + "score": 1.0, + "content": "require the input distribution to be Gaussian, but still relies on knowing the score function of the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 456, + 505, + 468 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 505, + 468 + ], + "score": 1.0, + "content": "input distribution (which in general cannot be estimated efficiently from samples). Recently, Gao", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "score": 1.0, + "content": "et al. (2018) gave a way to design loss functions with desired properties for one-hidden-layer neural", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 477, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 505, + 490 + ], + "score": 1.0, + "content": "networks with general input distributions based on a new proposed local likelihood score function", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 488, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 488, + 505, + 501 + ], + "score": 1.0, + "content": "estimator. For general distributions (including symmetric ones) their estimator can still require", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 500, + 422, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 314, + 512 + ], + "score": 1.0, + "content": "number of samples that is exponential in dimension", + "type": "text" + }, + { + "bbox": [ + 315, + 500, + 321, + 509 + ], + "score": 0.73, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 500, + 422, + 512 + ], + "score": 1.0, + "content": "(as in Assumption 1(d)).", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 26 + }, + { + "type": "text", + "bbox": [ + 106, + 523, + 505, + 645 + ], + "lines": [ + { + "bbox": [ + 106, + 524, + 504, + 536 + ], + "spans": [ + { + "bbox": [ + 106, + 524, + 504, + 536 + ], + "score": 1.0, + "content": "General input distributions There are several lines of work that try to extend the learning results", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 535, + 504, + 547 + ], + "spans": [ + { + "bbox": [ + 105, + 535, + 504, + 547 + ], + "score": 1.0, + "content": "to more general distributions. Du et al. (2017a) showed how to learn a single neuron or a single", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 104, + 545, + 506, + 559 + ], + "spans": [ + { + "bbox": [ + 104, + 545, + 506, + 559 + ], + "score": 1.0, + "content": "convolutional filter under some conditions for the input distribution. Daniely et al. (2016); Zhang", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 558, + 505, + 569 + ], + "spans": [ + { + "bbox": [ + 106, + 558, + 505, + 569 + ], + "score": 1.0, + "content": "et al. (2016; 2017); Goel & Klivans (2017); Du & Goel (2018) used kernel methods to learn neural", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 568, + 506, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 568, + 506, + 581 + ], + "score": 1.0, + "content": "networks when the norm of the weights and input distributions are both bounded (and in general", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 579, + 506, + 592 + ], + "spans": [ + { + "bbox": [ + 106, + 579, + 506, + 592 + ], + "score": 1.0, + "content": "the running time and sample complexity in this line of work depend exponentially on the norms of", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "score": 1.0, + "content": "weights/input). Recently, Du et al. (2018) showed that gradient descent minimizes the training error", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 104, + 600, + 506, + 613 + ], + "spans": [ + { + "bbox": [ + 104, + 600, + 506, + 613 + ], + "score": 1.0, + "content": "in an over-parameterized two-layer neural network. They only consider training error while our", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 612, + 505, + 624 + ], + "spans": [ + { + "bbox": [ + 105, + 612, + 505, + 624 + ], + "score": 1.0, + "content": "results also apply to testing error. The work that is most similar to our setting is Goel et al. (2018),", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 623, + 505, + 635 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 505, + 635 + ], + "score": 1.0, + "content": "where they showed how to learn a single neuron (or a single convolutional filter) for any symmetric", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 633, + 440, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 440, + 646 + ], + "score": 1.0, + "content": "input distribution. Our two-layer neural network model is much more complicated.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 107, + 666, + 504, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "Method-of-Moments and Tensor Decomposition Our work uses method-of-moments, which has", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "already been applied to learn many latent variable models (see Anandkumar et al. (2014) and refer-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 687, + 506, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 701 + ], + "score": 1.0, + "content": "ences there). The particular algorithm that we use is inspired by an over-complete tensor decompo-", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "score": 1.0, + "content": "sition algorithm FOOBI (De Lathauwer et al., 2007). Our smoothed analysis results are inspired by", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "Bhaskara et al. (2014) and Ma et al. (2016), although our setting is more complicated and we need", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 721, + 181, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 181, + 732 + ], + "score": 1.0, + "content": "several new ideas.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 43.5 + } + ], + "page_idx": 2, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 309, + 760 + ], + "lines": [ + { + "bbox": [ + 301, + 750, + 309, + 762 + ], + "spans": [ + { + "bbox": [ + 301, + 750, + 309, + 762 + ], + "score": 1.0, + "content": "3", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 504, + 127 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 425, + 95 + ], + "score": 1.0, + "content": "Theorem 3 (informal). There is a simple way to perturb the input distribution,", + "type": "text" + }, + { + "bbox": [ + 425, + 83, + 438, + 93 + ], + "score": 0.43, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 81, + 456, + 95 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 456, + 83, + 465, + 92 + ], + "score": 0.53, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 465, + 81, + 506, + 95 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "score": 1.0, + "content": "with high probability, the distance between the perturbed instance and original instance is at most", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 104, + 503, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 115, + 115 + ], + "score": 0.63, + "content": "\\lambda ,", + "type": "inline_equation" + }, + { + "bbox": [ + 115, + 105, + 451, + 117 + ], + "score": 1.0, + "content": ", and our algorithm outputs an \u000f-approximation to the perturbed network with poly", + "type": "text" + }, + { + "bbox": [ + 452, + 104, + 503, + 117 + ], + "score": 0.89, + "content": "( d , 1 / \\lambda , 1 / \\epsilon )", + "type": "inline_equation" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 116, + 223, + 128 + ], + "spans": [ + { + "bbox": [ + 106, + 116, + 223, + 128 + ], + "score": 1.0, + "content": "time and number of samples.", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5, + "bbox_fs": [ + 105, + 81, + 506, + 128 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 140, + 505, + 217 + ], + "lines": [ + { + "bbox": [ + 106, + 141, + 504, + 152 + ], + "spans": [ + { + "bbox": [ + 106, + 141, + 504, + 152 + ], + "score": 1.0, + "content": "In the rest of the paper, we will first review related works. Then in Section 2 we formally define", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 151, + 506, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 506, + 163 + ], + "score": 1.0, + "content": "the network and introduce some notations. Our algorithm is given in Section 3. Finally in Section 4", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 162, + 505, + 174 + ], + "spans": [ + { + "bbox": [ + 105, + 162, + 505, + 174 + ], + "score": 1.0, + "content": "we run experiments to show that the algorithm can indeed learn the two-layer network efficiently", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 173, + 505, + 185 + ], + "spans": [ + { + "bbox": [ + 106, + 173, + 505, + 185 + ], + "score": 1.0, + "content": "and robustly. The experiments show that our algorithm works robustly with reasonable number of", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 184, + 505, + 197 + ], + "spans": [ + { + "bbox": [ + 105, + 184, + 505, + 197 + ], + "score": 1.0, + "content": "samples for different (symmetric) input distributions and weight matrices. Due to space constraints,", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 195, + 505, + 207 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 505, + 207 + ], + "score": 1.0, + "content": "the proof for polynomial number of samples (Theorem 2) and smoothed analysis (Theorem 3) are", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 205, + 209, + 219 + ], + "spans": [ + { + "bbox": [ + 105, + 205, + 209, + 219 + ], + "score": 1.0, + "content": "deferred to the appendix.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 7, + "bbox_fs": [ + 105, + 141, + 506, + 219 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 239, + 202, + 250 + ], + "lines": [ + { + "bbox": [ + 106, + 238, + 205, + 252 + ], + "spans": [ + { + "bbox": [ + 106, + 238, + 205, + 252 + ], + "score": 1.0, + "content": "1.2 RELATED WORK", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 263, + 470, + 275 + ], + "lines": [ + { + "bbox": [ + 105, + 262, + 472, + 277 + ], + "spans": [ + { + "bbox": [ + 105, + 262, + 472, + 277 + ], + "score": 1.0, + "content": "There are many works in learning neural networks, and they come in many different styles.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12, + "bbox_fs": [ + 105, + 262, + 472, + 277 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 295, + 504, + 351 + ], + "lines": [ + { + "bbox": [ + 105, + 295, + 505, + 307 + ], + "spans": [ + { + "bbox": [ + 105, + 295, + 505, + 307 + ], + "score": 1.0, + "content": "Non-standard Networks Some works focus on networks that do not use standard activation func-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 306, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 106, + 306, + 505, + 318 + ], + "score": 1.0, + "content": "tions. Arora et al. (2014) gave an algorithm that learns a network with discrete variables. Livni", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 317, + 506, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 317, + 506, + 331 + ], + "score": 1.0, + "content": "et al. (2014) and follow-up works learn neural networks with polynomial activation functions. Oy-", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 326, + 506, + 343 + ], + "spans": [ + { + "bbox": [ + 104, + 326, + 506, + 343 + ], + "score": 1.0, + "content": "mak & Soltanolkotabi (2018) used the rank-1 tensor decomposition for learning a non-overlapping", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 339, + 472, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 472, + 352 + ], + "score": 1.0, + "content": "convolutional neural network with differentiable and smooth activation and Gaussian input.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 15, + "bbox_fs": [ + 104, + 295, + 506, + 352 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 364, + 505, + 420 + ], + "lines": [ + { + "bbox": [ + 105, + 363, + 506, + 377 + ], + "spans": [ + { + "bbox": [ + 105, + 363, + 506, + 377 + ], + "score": 1.0, + "content": "ReLU network, Gaussian input When the input is Gaussian, Ge et al. (2017b) showed that for a", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 374, + 505, + 389 + ], + "spans": [ + { + "bbox": [ + 105, + 374, + 505, + 389 + ], + "score": 1.0, + "content": "two-layer neural network, although the standard objective does have bad local optimal solutions, one", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 386, + 505, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 386, + 505, + 399 + ], + "score": 1.0, + "content": "can construct a new objective whose local optima are all globally optimal. Several other works (Tian,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 395, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 395, + 506, + 411 + ], + "score": 1.0, + "content": "2017; Du et al., 2017b; Brutzkus & Globerson, 2017; Li & Yuan, 2017; Soltanolkotabi, 2017; Zhong", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 407, + 362, + 422 + ], + "spans": [ + { + "bbox": [ + 105, + 407, + 362, + 422 + ], + "score": 1.0, + "content": "et al., 2017; Zhang et al., 2018) extend this to different settings.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 20, + "bbox_fs": [ + 105, + 363, + 506, + 422 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 433, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 106, + 434, + 505, + 445 + ], + "spans": [ + { + "bbox": [ + 106, + 434, + 505, + 445 + ], + "score": 1.0, + "content": "General input with score functions A closely related work (Janzamin et al., 2015) does not", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 445, + 504, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 445, + 504, + 456 + ], + "score": 1.0, + "content": "require the input distribution to be Gaussian, but still relies on knowing the score function of the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 456, + 505, + 468 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 505, + 468 + ], + "score": 1.0, + "content": "input distribution (which in general cannot be estimated efficiently from samples). Recently, Gao", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "score": 1.0, + "content": "et al. (2018) gave a way to design loss functions with desired properties for one-hidden-layer neural", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 477, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 505, + 490 + ], + "score": 1.0, + "content": "networks with general input distributions based on a new proposed local likelihood score function", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 488, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 488, + 505, + 501 + ], + "score": 1.0, + "content": "estimator. For general distributions (including symmetric ones) their estimator can still require", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 500, + 422, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 314, + 512 + ], + "score": 1.0, + "content": "number of samples that is exponential in dimension", + "type": "text" + }, + { + "bbox": [ + 315, + 500, + 321, + 509 + ], + "score": 0.73, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 500, + 422, + 512 + ], + "score": 1.0, + "content": "(as in Assumption 1(d)).", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 26, + "bbox_fs": [ + 105, + 434, + 505, + 512 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 523, + 505, + 645 + ], + "lines": [ + { + "bbox": [ + 106, + 524, + 504, + 536 + ], + "spans": [ + { + "bbox": [ + 106, + 524, + 504, + 536 + ], + "score": 1.0, + "content": "General input distributions There are several lines of work that try to extend the learning results", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 535, + 504, + 547 + ], + "spans": [ + { + "bbox": [ + 105, + 535, + 504, + 547 + ], + "score": 1.0, + "content": "to more general distributions. Du et al. (2017a) showed how to learn a single neuron or a single", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 104, + 545, + 506, + 559 + ], + "spans": [ + { + "bbox": [ + 104, + 545, + 506, + 559 + ], + "score": 1.0, + "content": "convolutional filter under some conditions for the input distribution. Daniely et al. (2016); Zhang", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 558, + 505, + 569 + ], + "spans": [ + { + "bbox": [ + 106, + 558, + 505, + 569 + ], + "score": 1.0, + "content": "et al. (2016; 2017); Goel & Klivans (2017); Du & Goel (2018) used kernel methods to learn neural", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 568, + 506, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 568, + 506, + 581 + ], + "score": 1.0, + "content": "networks when the norm of the weights and input distributions are both bounded (and in general", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 579, + 506, + 592 + ], + "spans": [ + { + "bbox": [ + 106, + 579, + 506, + 592 + ], + "score": 1.0, + "content": "the running time and sample complexity in this line of work depend exponentially on the norms of", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "score": 1.0, + "content": "weights/input). Recently, Du et al. (2018) showed that gradient descent minimizes the training error", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 104, + 600, + 506, + 613 + ], + "spans": [ + { + "bbox": [ + 104, + 600, + 506, + 613 + ], + "score": 1.0, + "content": "in an over-parameterized two-layer neural network. They only consider training error while our", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 612, + 505, + 624 + ], + "spans": [ + { + "bbox": [ + 105, + 612, + 505, + 624 + ], + "score": 1.0, + "content": "results also apply to testing error. The work that is most similar to our setting is Goel et al. (2018),", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 623, + 505, + 635 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 505, + 635 + ], + "score": 1.0, + "content": "where they showed how to learn a single neuron (or a single convolutional filter) for any symmetric", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 633, + 440, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 440, + 646 + ], + "score": 1.0, + "content": "input distribution. Our two-layer neural network model is much more complicated.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 35, + "bbox_fs": [ + 104, + 524, + 506, + 646 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 666, + 504, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "Method-of-Moments and Tensor Decomposition Our work uses method-of-moments, which has", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "already been applied to learn many latent variable models (see Anandkumar et al. (2014) and refer-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 687, + 506, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 701 + ], + "score": 1.0, + "content": "ences there). The particular algorithm that we use is inspired by an over-complete tensor decompo-", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "score": 1.0, + "content": "sition algorithm FOOBI (De Lathauwer et al., 2007). Our smoothed analysis results are inspired by", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "Bhaskara et al. (2014) and Ma et al. 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"content": "The exact reason for these definitions will only be clear after we explain the algorithm in Section 3.", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 342, + 504, + 355 + ], + "spans": [ + { + "bbox": [ + 105, + 342, + 463, + 355 + ], + "score": 1.0, + "content": "Our algorithm will require that these matrices are robustly full rank, in the sense that", + "type": "text" + }, + { + "bbox": [ + 463, + 342, + 504, + 354 + ], + "score": 0.92, + "content": "\\sigma _ { m i n } ( M )", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 352, + 506, + 368 + ], + "spans": [ + { + "bbox": [ + 104, + 352, + 288, + 368 + ], + "score": 1.0, + "content": "is lowerbounded. Intuitively, every column", + "type": "text" + }, + { + "bbox": [ + 288, + 353, + 305, + 366 + ], + "score": 0.92, + "content": "N _ { i j } ^ { \\mathcal { D } }", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 352, + 506, + 368 + ], + "score": 1.0, + "content": "looks at the expectation over samples that have", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 366, + 466, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 213, + 379 + ], + "score": 1.0, + "content": "opposite signs for weights", + "type": "text" + }, + { + "bbox": [ + 213, + 366, + 241, + 379 + ], + "score": 0.6, + "content": "w _ { i } , w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 366, + 304, + 380 + ], + "score": 0.81, + "content": "( w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq \\bar { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 367, + 466, + 379 + ], + "score": 1.0, + "content": ", hence the name distinguishing matrix).", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 19.5 + }, + { + "type": "text", + "bbox": [ + 106, + 383, + 505, + 462 + ], + "lines": [ + { + "bbox": [ + 106, + 383, + 505, + 396 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 149, + 396 + ], + "score": 1.0, + "content": "Requiring", + "type": "text" + }, + { + "bbox": [ + 149, + 384, + 162, + 394 + ], + "score": 0.77, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 383, + 180, + 396 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 180, + 384, + 191, + 393 + ], + "score": 0.82, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 383, + 505, + 396 + ], + "score": 1.0, + "content": "to be full rank prevents several degenerate cases. For example, if two hidden", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 394, + 505, + 407 + ], + "spans": [ + { + "bbox": [ + 106, + 394, + 505, + 407 + ], + "score": 1.0, + "content": "units are perfectly correlated and always share the same sign for every input, this is very unnatural", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 105, + 405, + 505, + 417 + ], + "score": 1.0, + "content": "and requiring the distinguishing matrix to be full rank prevents such cases. Later in Section C we will", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 416, + 505, + 429 + ], + "spans": [ + { + "bbox": [ + 106, + 417, + 276, + 429 + ], + "score": 1.0, + "content": "also show that requiring a lowerbound on", + "type": "text" + }, + { + "bbox": [ + 277, + 416, + 317, + 428 + ], + "score": 0.93, + "content": "\\sigma _ { m i n } ( M )", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 417, + 505, + 429 + ], + "score": 1.0, + "content": "is not unreasonable: in the smoothed analysis", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 427, + 506, + 439 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 423, + 439 + ], + "score": 1.0, + "content": "setting where the nature can make a small perturbation on the input distribution", + "type": "text" + }, + { + "bbox": [ + 424, + 428, + 433, + 437 + ], + "score": 0.76, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 427, + 506, + 439 + ], + "score": 1.0, + "content": ", we show that for", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 438, + 506, + 451 + ], + "spans": [ + { + "bbox": [ + 106, + 439, + 194, + 451 + ], + "score": 1.0, + "content": "any input distribution", + "type": "text" + }, + { + "bbox": [ + 194, + 439, + 203, + 448 + ], + "score": 0.79, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 439, + 337, + 451 + ], + "score": 1.0, + "content": ", there exists simple perturbations", + "type": "text" + }, + { + "bbox": [ + 337, + 438, + 349, + 448 + ], + "score": 0.88, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 439, + 457, + 451 + ], + "score": 1.0, + "content": "that are arbitrarily close to", + "type": "text" + }, + { + "bbox": [ + 457, + 439, + 466, + 448 + ], + "score": 0.8, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 439, + 506, + 451 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 449, + 230, + 463 + ], + "spans": [ + { + "bbox": [ + 107, + 450, + 157, + 463 + ], + "score": 0.93, + "content": "\\sigma _ { m i n } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 449, + 230, + 463 + ], + "score": 1.0, + "content": "is lowerbounded.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 25 + }, + { + "type": "title", + "bbox": [ + 108, + 478, + 217, + 491 + ], + "lines": [ + { + "bbox": [ + 104, + 475, + 219, + 493 + ], + "spans": [ + { + "bbox": [ + 104, + 475, + 219, + 493 + ], + "score": 1.0, + "content": "3 OUR ALGORITHM", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 106, + 502, + 505, + 569 + ], + "lines": [ + { + "bbox": [ + 105, + 502, + 505, + 515 + ], + "spans": [ + { + "bbox": [ + 105, + 502, + 505, + 515 + ], + "score": 1.0, + "content": "In this section, we describe our algorithm for learning the two-layer networks defined in Section 2.1.", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 514, + 506, + 527 + ], + "spans": [ + { + "bbox": [ + 105, + 514, + 506, + 527 + ], + "score": 1.0, + "content": "As a warm-up, we will first consider a single-layer neural network and recover the results in Goel", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 524, + 506, + 538 + ], + "spans": [ + { + "bbox": [ + 105, + 524, + 506, + 538 + ], + "score": 1.0, + "content": "et al. (2018) using method-of-moments. This will also be used as a crucial step in our algorithm. Due", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 536, + 505, + 548 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 505, + 548 + ], + "score": 1.0, + "content": "to space constraints we will only introduce algorithm and proof ideas, the detailed proof is deferred", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 546, + 506, + 559 + ], + "spans": [ + { + "bbox": [ + 105, + 546, + 370, + 559 + ], + "score": 1.0, + "content": "to Section A in appendix. 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(2018)) to learn the weight vectors.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 518, + 505, + 552 + ], + "lines": [ + { + "bbox": [ + 105, + 517, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 105, + 517, + 133, + 532 + ], + "score": 1.0, + "content": "When", + "type": "text" + }, + { + "bbox": [ + 133, + 518, + 186, + 530 + ], + "score": 0.91, + "content": "u ^ { \\top } A = \\lambda _ { i } e _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 517, + 239, + 532 + ], + "score": 1.0, + "content": ", we say that", + "type": "text" + }, + { + "bbox": [ + 240, + 518, + 259, + 531 + ], + "score": 0.91, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 517, + 505, + 532 + ], + "score": 1.0, + "content": "is a pure neuron. Next we will design an algorithm that can", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 528, + 506, + 543 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 171, + 543 + ], + "score": 1.0, + "content": "find all vectors", + "type": "text" + }, + { + "bbox": [ + 171, + 530, + 189, + 542 + ], + "score": 0.91, + "content": "\\left\\{ z _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 528, + 506, + 543 + ], + "score": 1.0, + "content": "’s that generate pure neurons, and therefore reduce the problem of learning a", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 541, + 322, + 553 + ], + "spans": [ + { + "bbox": [ + 106, + 541, + 322, + 553 + ], + "score": 1.0, + "content": "two-layer network to learning a single-layer network.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 107, + 565, + 502, + 588 + ], + "lines": [ + { + "bbox": [ + 105, + 564, + 505, + 578 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 318, + 578 + ], + "score": 1.0, + "content": "Pure Neuron Detector In order to find the vector", + "type": "text" + }, + { + "bbox": [ + 319, + 568, + 326, + 575 + ], + "score": 0.75, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 564, + 505, + 578 + ], + "score": 1.0, + "content": "that generates a pure neuron, we will try to", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 576, + 480, + 590 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 480, + 590 + ], + "score": 1.0, + "content": "find some property that is true if and only if the output can be represented by a single neuron.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5 + }, + { + "type": "text", + "bbox": [ + 104, + 593, + 493, + 605 + ], + "lines": [ + { + "bbox": [ + 106, + 592, + 493, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 592, + 493, + 606 + ], + "score": 1.0, + "content": "Intuitively, using ideas similar to Lemma 1 we can get a property that holds for all pure neurons:", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 106, + 607, + 504, + 630 + ], + "lines": [ + { + "bbox": [ + 104, + 605, + 504, + 623 + ], + "spans": [ + { + "bbox": [ + 104, + 605, + 191, + 623 + ], + "score": 1.0, + "content": "Lemma 2. Suppose", + "type": "text" + }, + { + "bbox": [ + 192, + 607, + 248, + 621 + ], + "score": 0.93, + "content": "\\boldsymbol { \\hat { y } } = \\sigma ( \\boldsymbol { w } ^ { \\top } \\boldsymbol { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 605, + 273, + 623 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 273, + 607, + 371, + 622 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } ^ { 2 } ] = \\frac { 1 } { 2 } w ^ { \\top } \\mathbb { E } [ x x ^ { \\top } ] w , } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 605, + 393, + 623 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 393, + 607, + 477, + 622 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } x ] = \\frac { 1 } { 2 } \\mathbb { E } [ x x ^ { \\top } ] w } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 478, + 605, + 497, + 623 + ], + "score": 1.0, + "content": ". 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Next we will design an algorithm that can", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 528, + 506, + 543 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 171, + 543 + ], + "score": 1.0, + "content": "find all vectors", + "type": "text" + }, + { + "bbox": [ + 171, + 530, + 189, + 542 + ], + "score": 0.91, + "content": "\\left\\{ z _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 528, + 506, + 543 + ], + "score": 1.0, + "content": "’s that generate pure neurons, and therefore reduce the problem of learning a", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 541, + 322, + 553 + ], + "spans": [ + { + "bbox": [ + 106, + 541, + 322, + 553 + ], + "score": 1.0, + "content": "two-layer network to learning a single-layer network.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29, + "bbox_fs": [ + 105, + 517, + 506, + 553 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 565, + 502, + 588 + ], + "lines": [ + { + "bbox": [ + 105, + 564, + 505, + 578 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 318, + 578 + ], + "score": 1.0, + "content": "Pure Neuron Detector In order to find the vector", + "type": "text" + }, + { + "bbox": [ + 319, + 568, + 326, + 575 + ], + "score": 0.75, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 564, + 505, + 578 + ], + "score": 1.0, + "content": "that generates a pure neuron, we will try to", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 576, + 480, + 590 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 480, + 590 + ], + "score": 1.0, + "content": "find some property that is true if and only if the output can be represented by a single neuron.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5, + "bbox_fs": [ + 105, + 564, + 505, + 590 + ] + }, + { + "type": "text", + "bbox": [ + 104, + 593, + 493, + 605 + ], + "lines": [ + { + "bbox": [ + 106, + 592, + 493, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 592, + 493, + 606 + ], + "score": 1.0, + "content": "Intuitively, using ideas similar to Lemma 1 we can get a property that holds for all pure neurons:", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33, + "bbox_fs": [ + 106, + 592, + 493, + 606 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 607, + 504, + 630 + ], + "lines": [ + { + "bbox": [ + 104, + 605, + 504, + 623 + ], + "spans": [ + { + "bbox": [ + 104, + 605, + 191, + 623 + ], + "score": 1.0, + "content": "Lemma 2. Suppose", + "type": "text" + }, + { + "bbox": [ + 192, + 607, + 248, + 621 + ], + "score": 0.93, + "content": "\\boldsymbol { \\hat { y } } = \\sigma ( \\boldsymbol { w } ^ { \\top } \\boldsymbol { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 605, + 273, + 623 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 273, + 607, + 371, + 622 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } ^ { 2 } ] = \\frac { 1 } { 2 } w ^ { \\top } \\mathbb { E } [ x x ^ { \\top } ] w , } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 605, + 393, + 623 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 393, + 607, + 477, + 622 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } x ] = \\frac { 1 } { 2 } \\mathbb { E } [ x x ^ { \\top } ] w } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 478, + 605, + 497, + 623 + ], + "score": 1.0, + "content": ". 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For", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 107, + 664, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 107, + 664, + 145, + 677 + ], + "score": 0.92, + "content": "\\hat { y } = u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 664, + 303, + 678 + ], + "score": 1.0, + "content": ", we can estimate all of these moments", + "type": "text" + }, + { + "bbox": [ + 303, + 664, + 401, + 677 + ], + "score": 0.91, + "content": "( \\mathbb { E } [ \\hat { y } ^ { 2 } ] , \\mathbb { E } [ \\hat { y } x ^ { \\top } ] , \\bar { \\mathbb { E } } [ x x ^ { \\top } ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 664, + 506, + 678 + ], + "score": 1.0, + "content": "using samples and check", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 674, + 504, + 689 + ], + "spans": [ + { + "bbox": [ + 106, + 674, + 466, + 689 + ], + "score": 1.0, + "content": "whether this condition is satisfied. However, the problem with this property is that even if", + "type": "text" + }, + { + "bbox": [ + 466, + 675, + 504, + 687 + ], + "score": 0.92, + "content": "z = u ^ { \\top } y", + "type": "inline_equation" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 687, + 500, + 704 + ], + "spans": [ + { + "bbox": [ + 104, + 687, + 353, + 704 + ], + "score": 1.0, + "content": "is not pure, it may still satisfy the property. More precisely, if", + "type": "text" + }, + { + "bbox": [ + 354, + 687, + 440, + 702 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 687, + 500, + 704 + ], + "score": 1.0, + "content": ", then we have", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 38.5, + "bbox_fs": [ + 104, + 653, + 506, + 704 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 133, + 707, + 477, + 736 + ], + "lines": [ + { + "bbox": [ + 133, + 707, + 477, + 736 + ], + "spans": [ + { + "bbox": [ + 133, + 707, + 477, + 736 + ], + "score": 0.92, + "content": "2 \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { y } x ] - \\mathbb { E } [ \\hat { y } ^ { 2 } ] = \\sum _ { 1 \\leq i < j \\leq k } c _ { i } c _ { j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ]", + "type": "interline_equation", + "image_path": "7c77d5af033fbb312d9fb36c1b2cd03b78c1a5e3004c9f9ee835ab8e08fcadf1.jpg" + } + ] + } + ], + "index": 42, + "virtual_lines": [ + { + "bbox": [ + 133, + 707, + 477, + 716.6666666666666 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 133, + 716.6666666666666, + 477, + 726.3333333333333 + ], + "spans": [], + "index": 42 + }, + { + "bbox": [ + 133, + 726.3333333333333, + 477, + 735.9999999999999 + ], + "spans": [], + "index": 43 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 505, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 80, + 505, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 80, + 505, + 96 + ], + "score": 1.0, + "content": "The additional terms may accidentally cancel each other which leads to a false positive. To address", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 308, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 308, + 106 + ], + "score": 1.0, + "content": "this problem, we consider a higher order moment:", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 106, + 108, + 266, + 120 + ], + "lines": [ + { + "bbox": [ + 105, + 107, + 267, + 122 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 190, + 122 + ], + "score": 1.0, + "content": "Lemma 3. Suppose", + "type": "text" + }, + { + "bbox": [ + 190, + 107, + 243, + 121 + ], + "score": 0.93, + "content": "\\boldsymbol { \\hat { y } } = \\sigma ( \\boldsymbol { w } ^ { \\top } \\boldsymbol { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 107, + 267, + 122 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 2 + }, + { + "type": "interline_equation", + "bbox": [ + 190, + 126, + 421, + 142 + ], + "lines": [ + { + "bbox": [ + 190, + 126, + 421, + 142 + ], + "spans": [ + { + "bbox": [ + 190, + 126, + 421, + 142 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ] = 2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] . } \\end{array}", + "type": "interline_equation", + "image_path": "6a40e644650ce5d69fa1da6c2e4a95a95efe6438997c2569bf48135a1ee17cd0.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 190, + 126, + 421, + 142 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 149, + 443, + 163 + ], + "lines": [ + { + "bbox": [ + 103, + 144, + 446, + 167 + ], + "spans": [ + { + "bbox": [ + 103, + 144, + 157, + 167 + ], + "score": 1.0, + "content": "Moreover, if", + "type": "text" + }, + { + "bbox": [ + 157, + 147, + 244, + 163 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 144, + 271, + 167 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 271, + 149, + 301, + 160 + ], + "score": 0.92, + "content": "c \\in \\mathbb { R } ^ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 144, + 319, + 167 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 319, + 150, + 326, + 160 + ], + "score": 0.73, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 144, + 446, + 167 + ], + "score": 1.0, + "content": "-dimensional vector, we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + }, + { + "type": "interline_equation", + "bbox": [ + 151, + 168, + 459, + 196 + ], + "lines": [ + { + "bbox": [ + 151, + 168, + 459, + 196 + ], + "spans": [ + { + "bbox": [ + 151, + 168, + 459, + 196 + ], + "score": 0.89, + "content": "2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ] = \\sum _ { 1 \\leq i < j \\leq k } c _ { i } c _ { j } N _ { i j } .", + "type": "interline_equation", + "image_path": "e261d5a7ab283270bd9a0b80d0dfd09af67acec9f8e91d2858a3aea5d53de809.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 151, + 168, + 459, + 196 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 201, + 408, + 213 + ], + "lines": [ + { + "bbox": [ + 106, + 201, + 406, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 201, + 128, + 215 + ], + "score": 1.0, + "content": "Here", + "type": "text" + }, + { + "bbox": [ + 129, + 202, + 145, + 214 + ], + "score": 0.87, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 201, + 400, + 215 + ], + "score": 1.0, + "content": "’s are columns of the distinguishing matrix defined in Definition", + "type": "text" + }, + { + "bbox": [ + 401, + 203, + 406, + 212 + ], + "score": 0.57, + "content": "I", + "type": "inline_equation" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 106, + 223, + 506, + 307 + ], + "lines": [ + { + "bbox": [ + 104, + 221, + 508, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 221, + 357, + 240 + ], + "score": 1.0, + "content": "The important observation here is that there are", + "type": "text" + }, + { + "bbox": [ + 358, + 223, + 424, + 238 + ], + "score": 0.89, + "content": "\\begin{array} { r l r } { k _ { 2 } } & { { } \\ = \\ } & { \\left( \\begin{array} { c } { k } \\\\ { 2 } \\end{array} \\right) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 424, + 221, + 508, + 240 + ], + "score": 1.0, + "content": "extra terms in", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 236, + 506, + 251 + ], + "spans": [ + { + "bbox": [ + 106, + 236, + 339, + 251 + ], + "score": 0.85, + "content": "2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 236, + 437, + 251 + ], + "score": 1.0, + "content": "that are multiples of", + "type": "text" + }, + { + "bbox": [ + 437, + 238, + 453, + 250 + ], + "score": 0.9, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 453, + 236, + 506, + 251 + ], + "score": 1.0, + "content": ", which are", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 246, + 506, + 269 + ], + "spans": [ + { + "bbox": [ + 106, + 250, + 117, + 262 + ], + "score": 0.83, + "content": "d ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 246, + 135, + 269 + ], + "score": 1.0, + "content": "(or", + "type": "text" + }, + { + "bbox": [ + 135, + 250, + 158, + 264 + ], + "score": 0.9, + "content": "\\binom { d + 1 } { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 246, + 506, + 269 + ], + "score": 1.0, + "content": "considering their symmetry) dimensional objects. When the distinguishing matrix is", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 262, + 505, + 275 + ], + "spans": [ + { + "bbox": [ + 105, + 262, + 236, + 275 + ], + "score": 1.0, + "content": "full rank, we know its columns", + "type": "text" + }, + { + "bbox": [ + 236, + 263, + 252, + 275 + ], + "score": 0.91, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 262, + 505, + 275 + ], + "score": 1.0, + "content": "are linearly independent. In that case, if the sum of the extra", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 273, + 505, + 286 + ], + "spans": [ + { + "bbox": [ + 105, + 273, + 295, + 286 + ], + "score": 1.0, + "content": "terms is 0, then the coefficient in front of each", + "type": "text" + }, + { + "bbox": [ + 295, + 274, + 311, + 286 + ], + "score": 0.91, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 273, + 459, + 286 + ], + "score": 1.0, + "content": "must also be 0. The coefficients are", + "type": "text" + }, + { + "bbox": [ + 459, + 275, + 477, + 286 + ], + "score": 0.9, + "content": "c _ { i } c _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 273, + 505, + 286 + ], + "score": 1.0, + "content": "which", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 284, + 506, + 298 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 254, + 298 + ], + "score": 1.0, + "content": "will be non-zero if and only if both", + "type": "text" + }, + { + "bbox": [ + 254, + 286, + 276, + 297 + ], + "score": 0.88, + "content": "c _ { i } , c _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 284, + 506, + 298 + ], + "score": 1.0, + "content": "are non-zero, therefore to make all the coefficients 0 at", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 293, + 435, + 309 + ], + "spans": [ + { + "bbox": [ + 105, + 293, + 156, + 309 + ], + "score": 1.0, + "content": "most one of", + "type": "text" + }, + { + "bbox": [ + 156, + 295, + 175, + 307 + ], + "score": 0.93, + "content": "\\left\\{ c _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 293, + 435, + 309 + ], + "score": 1.0, + "content": "can be non-zero. This is summarized in the following Corollary:", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 106, + 310, + 515, + 347 + ], + "lines": [ + { + "bbox": [ + 105, + 309, + 518, + 325 + ], + "spans": [ + { + "bbox": [ + 105, + 309, + 284, + 325 + ], + "score": 1.0, + "content": "Corollary 1 (Pure Neuron Detector). Define", + "type": "text" + }, + { + "bbox": [ + 284, + 310, + 518, + 325 + ], + "score": 0.88, + "content": "\\begin{array} { r } { f ( u ) : = 2 \\mathbb { E } \\left[ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] } \\end{array}", + "type": "inline_equation" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 322, + 506, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 323, + 191, + 336 + ], + "score": 0.9, + "content": "- \\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 322, + 392, + 338 + ], + "score": 1.0, + "content": ". Suppose the distinguishing matrix is full rank, if", + "type": "text" + }, + { + "bbox": [ + 392, + 325, + 433, + 336 + ], + "score": 0.9, + "content": "\\dot { f } ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 322, + 494, + 338 + ], + "score": 1.0, + "content": "for unit vector", + "type": "text" + }, + { + "bbox": [ + 495, + 327, + 501, + 335 + ], + "score": 0.63, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 322, + 506, + 338 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 333, + 251, + 349 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 229, + 349 + ], + "score": 1.0, + "content": "then u must be equal to one of", + "type": "text" + }, + { + "bbox": [ + 229, + 336, + 246, + 347 + ], + "score": 0.8, + "content": "\\pm z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 333, + 251, + 349 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 106, + 356, + 505, + 379 + ], + "lines": [ + { + "bbox": [ + 106, + 355, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 106, + 355, + 207, + 370 + ], + "score": 1.0, + "content": "We will call the function", + "type": "text" + }, + { + "bbox": [ + 207, + 356, + 227, + 369 + ], + "score": 0.92, + "content": "f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 355, + 333, + 370 + ], + "score": 1.0, + "content": "a pure neuron detector, as", + "type": "text" + }, + { + "bbox": [ + 333, + 356, + 353, + 368 + ], + "score": 0.91, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 355, + 473, + 370 + ], + "score": 1.0, + "content": "is a pure neuron if and only if", + "type": "text" + }, + { + "bbox": [ + 473, + 356, + 505, + 369 + ], + "score": 0.9, + "content": "f ( u ) =", + "type": "inline_equation" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 366, + 440, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 398, + 380 + ], + "score": 1.0, + "content": "0. Therefore, to finish the algorithm we just need to find all solutions for", + "type": "text" + }, + { + "bbox": [ + 398, + 367, + 437, + 380 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 366, + 440, + 380 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17.5 + }, + { + "type": "text", + "bbox": [ + 106, + 391, + 506, + 506 + ], + "lines": [ + { + "bbox": [ + 105, + 390, + 505, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 390, + 390, + 405 + ], + "score": 1.0, + "content": "Linearization The main obstacle in solving the system of equations", + "type": "text" + }, + { + "bbox": [ + 390, + 392, + 429, + 403 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 390, + 505, + 405 + ], + "score": 1.0, + "content": "is that every entry", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 401, + 506, + 416 + ], + "spans": [ + { + "bbox": [ + 105, + 401, + 118, + 416 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 119, + 402, + 139, + 415 + ], + "score": 0.92, + "content": "f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 140, + 401, + 250, + 416 + ], + "score": 1.0, + "content": "is a quadratic function in", + "type": "text" + }, + { + "bbox": [ + 250, + 405, + 257, + 412 + ], + "score": 0.7, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 401, + 370, + 416 + ], + "score": 1.0, + "content": ". The system of equations", + "type": "text" + }, + { + "bbox": [ + 370, + 403, + 414, + 415 + ], + "score": 0.93, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 414, + 401, + 506, + 416 + ], + "score": 1.0, + "content": "is therefore a system", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 413, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 413, + 506, + 426 + ], + "score": 1.0, + "content": "of quadratic equations. Solving a generic system of quadratic equations is NP-hard. However, in", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 424, + 506, + 437 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 506, + 437 + ], + "score": 1.0, + "content": "our case this can be solved by a technique that is very similar to the FOOBI algorithm for tensor", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 434, + 506, + 449 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 506, + 449 + ], + "score": 1.0, + "content": "decomposition (De Lathauwer et al., 2007). The key idea is to linearize the function by thinking of", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 445, + 504, + 463 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 204, + 463 + ], + "score": 1.0, + "content": "each degree 2 monomial", + "type": "text" + }, + { + "bbox": [ + 205, + 450, + 225, + 460 + ], + "score": 0.87, + "content": "u _ { i } u _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 445, + 438, + 463 + ], + "score": 1.0, + "content": "as a separate variable. Now the number of variables is", + "type": "text" + }, + { + "bbox": [ + 439, + 446, + 504, + 461 + ], + "score": 0.93, + "content": "k _ { 2 } + k = { \\binom { k } { 2 } } + k", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 458, + 507, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 458, + 124, + 476 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 125, + 462, + 132, + 474 + ], + "score": 0.83, + "content": "f", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 458, + 389, + 476 + ], + "score": 1.0, + "content": "is linear in this space. In other words, there exists a matrix", + "type": "text" + }, + { + "bbox": [ + 390, + 460, + 462, + 472 + ], + "score": 0.9, + "content": "T \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 463, + 458, + 507, + 476 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 472, + 506, + 487 + ], + "spans": [ + { + "bbox": [ + 107, + 472, + 194, + 484 + ], + "score": 0.9, + "content": "T \\mathrm { v e c } ^ { * } ( u u _ { - } ^ { \\top } ) = f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 472, + 244, + 487 + ], + "score": 1.0, + "content": ". Clearly, if", + "type": "text" + }, + { + "bbox": [ + 244, + 472, + 263, + 484 + ], + "score": 0.92, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 472, + 357, + 487 + ], + "score": 1.0, + "content": "is a pure neuron, then", + "type": "text" + }, + { + "bbox": [ + 357, + 473, + 466, + 485 + ], + "score": 0.92, + "content": "T \\mathrm { v e c } ^ { * } ( u u ^ { \\top } ) = f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 472, + 506, + 487 + ], + "score": 1.0, + "content": ". 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To address", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 308, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 308, + 106 + ], + "score": 1.0, + "content": "this problem, we consider a higher order moment:", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 105, + 80, + 505, + 106 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 108, + 266, + 120 + ], + "lines": [ + { + "bbox": [ + 105, + 107, + 267, + 122 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 190, + 122 + ], + "score": 1.0, + "content": "Lemma 3. Suppose", + "type": "text" + }, + { + "bbox": [ + 190, + 107, + 243, + 121 + ], + "score": 0.93, + "content": "\\boldsymbol { \\hat { y } } = \\sigma ( \\boldsymbol { w } ^ { \\top } \\boldsymbol { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 107, + 267, + 122 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 2, + "bbox_fs": [ + 105, + 107, + 267, + 122 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 190, + 126, + 421, + 142 + ], + "lines": [ + { + "bbox": [ + 190, + 126, + 421, + 142 + ], + "spans": [ + { + "bbox": [ + 190, + 126, + 421, + 142 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ] = 2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] . } \\end{array}", + "type": "interline_equation", + "image_path": "6a40e644650ce5d69fa1da6c2e4a95a95efe6438997c2569bf48135a1ee17cd0.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 190, + 126, + 421, + 142 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 149, + 443, + 163 + ], + "lines": [ + { + "bbox": [ + 103, + 144, + 446, + 167 + ], + "spans": [ + { + "bbox": [ + 103, + 144, + 157, + 167 + ], + "score": 1.0, + "content": "Moreover, if", + "type": "text" + }, + { + "bbox": [ + 157, + 147, + 244, + 163 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 144, + 271, + 167 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 271, + 149, + 301, + 160 + ], + "score": 0.92, + "content": "c \\in \\mathbb { R } ^ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 144, + 319, + 167 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 319, + 150, + 326, + 160 + ], + "score": 0.73, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 144, + 446, + 167 + ], + "score": 1.0, + "content": "-dimensional vector, we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4, + "bbox_fs": [ + 103, + 144, + 446, + 167 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 151, + 168, + 459, + 196 + ], + "lines": [ + { + "bbox": [ + 151, + 168, + 459, + 196 + ], + "spans": [ + { + "bbox": [ + 151, + 168, + 459, + 196 + ], + "score": 0.89, + "content": "2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ] = \\sum _ { 1 \\leq i < j \\leq k } c _ { i } c _ { j } N _ { i j } .", + "type": "interline_equation", + "image_path": "e261d5a7ab283270bd9a0b80d0dfd09af67acec9f8e91d2858a3aea5d53de809.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 151, + 168, + 459, + 196 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 201, + 408, + 213 + ], + "lines": [ + { + "bbox": [ + 106, + 201, + 406, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 201, + 128, + 215 + ], + "score": 1.0, + "content": "Here", + "type": "text" + }, + { + "bbox": [ + 129, + 202, + 145, + 214 + ], + "score": 0.87, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 201, + 400, + 215 + ], + "score": 1.0, + "content": "’s are columns of the distinguishing matrix defined in Definition", + "type": "text" + }, + { + "bbox": [ + 401, + 203, + 406, + 212 + ], + "score": 0.57, + "content": "I", + "type": "inline_equation" + } + ], + "index": 6 + } + ], + "index": 6, + "bbox_fs": [ + 106, + 201, + 406, + 215 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 223, + 506, + 307 + ], + "lines": [ + { + "bbox": [ + 104, + 221, + 508, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 221, + 357, + 240 + ], + "score": 1.0, + "content": "The important observation here is that there are", + "type": "text" + }, + { + "bbox": [ + 358, + 223, + 424, + 238 + ], + "score": 0.89, + "content": "\\begin{array} { r l r } { k _ { 2 } } & { { } \\ = \\ } & { \\left( \\begin{array} { c } { k } \\\\ { 2 } \\end{array} \\right) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 424, + 221, + 508, + 240 + ], + "score": 1.0, + "content": "extra terms in", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 236, + 506, + 251 + ], + "spans": [ + { + "bbox": [ + 106, + 236, + 339, + 251 + ], + "score": 0.85, + "content": "2 \\mathbb { E } \\left[ \\hat { y } \\cdot ( \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } [ \\hat { y } ^ { 2 } ( x \\otimes x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 236, + 437, + 251 + ], + "score": 1.0, + "content": "that are multiples of", + "type": "text" + }, + { + "bbox": [ + 437, + 238, + 453, + 250 + ], + "score": 0.9, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 453, + 236, + 506, + 251 + ], + "score": 1.0, + "content": ", which are", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 246, + 506, + 269 + ], + "spans": [ + { + "bbox": [ + 106, + 250, + 117, + 262 + ], + "score": 0.83, + "content": "d ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 246, + 135, + 269 + ], + "score": 1.0, + "content": "(or", + "type": "text" + }, + { + "bbox": [ + 135, + 250, + 158, + 264 + ], + "score": 0.9, + "content": "\\binom { d + 1 } { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 246, + 506, + 269 + ], + "score": 1.0, + "content": "considering their symmetry) dimensional objects. When the distinguishing matrix is", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 262, + 505, + 275 + ], + "spans": [ + { + "bbox": [ + 105, + 262, + 236, + 275 + ], + "score": 1.0, + "content": "full rank, we know its columns", + "type": "text" + }, + { + "bbox": [ + 236, + 263, + 252, + 275 + ], + "score": 0.91, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 262, + 505, + 275 + ], + "score": 1.0, + "content": "are linearly independent. In that case, if the sum of the extra", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 273, + 505, + 286 + ], + "spans": [ + { + "bbox": [ + 105, + 273, + 295, + 286 + ], + "score": 1.0, + "content": "terms is 0, then the coefficient in front of each", + "type": "text" + }, + { + "bbox": [ + 295, + 274, + 311, + 286 + ], + "score": 0.91, + "content": "N _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 273, + 459, + 286 + ], + "score": 1.0, + "content": "must also be 0. The coefficients are", + "type": "text" + }, + { + "bbox": [ + 459, + 275, + 477, + 286 + ], + "score": 0.9, + "content": "c _ { i } c _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 273, + 505, + 286 + ], + "score": 1.0, + "content": "which", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 284, + 506, + 298 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 254, + 298 + ], + "score": 1.0, + "content": "will be non-zero if and only if both", + "type": "text" + }, + { + "bbox": [ + 254, + 286, + 276, + 297 + ], + "score": 0.88, + "content": "c _ { i } , c _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 284, + 506, + 298 + ], + "score": 1.0, + "content": "are non-zero, therefore to make all the coefficients 0 at", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 293, + 435, + 309 + ], + "spans": [ + { + "bbox": [ + 105, + 293, + 156, + 309 + ], + "score": 1.0, + "content": "most one of", + "type": "text" + }, + { + "bbox": [ + 156, + 295, + 175, + 307 + ], + "score": 0.93, + "content": "\\left\\{ c _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 293, + 435, + 309 + ], + "score": 1.0, + "content": "can be non-zero. This is summarized in the following Corollary:", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 10, + "bbox_fs": [ + 104, + 221, + 508, + 309 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 310, + 515, + 347 + ], + "lines": [ + { + "bbox": [ + 105, + 309, + 518, + 325 + ], + "spans": [ + { + "bbox": [ + 105, + 309, + 284, + 325 + ], + "score": 1.0, + "content": "Corollary 1 (Pure Neuron Detector). Define", + "type": "text" + }, + { + "bbox": [ + 284, + 310, + 518, + 325 + ], + "score": 0.88, + "content": "\\begin{array} { r } { f ( u ) : = 2 \\mathbb { E } \\left[ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] } \\end{array}", + "type": "inline_equation" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 322, + 506, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 323, + 191, + 336 + ], + "score": 0.9, + "content": "- \\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 322, + 392, + 338 + ], + "score": 1.0, + "content": ". Suppose the distinguishing matrix is full rank, if", + "type": "text" + }, + { + "bbox": [ + 392, + 325, + 433, + 336 + ], + "score": 0.9, + "content": "\\dot { f } ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 322, + 494, + 338 + ], + "score": 1.0, + "content": "for unit vector", + "type": "text" + }, + { + "bbox": [ + 495, + 327, + 501, + 335 + ], + "score": 0.63, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 322, + 506, + 338 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 333, + 251, + 349 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 229, + 349 + ], + "score": 1.0, + "content": "then u must be equal to one of", + "type": "text" + }, + { + "bbox": [ + 229, + 336, + 246, + 347 + ], + "score": 0.8, + "content": "\\pm z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 333, + 251, + 349 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15, + "bbox_fs": [ + 105, + 309, + 518, + 349 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 356, + 505, + 379 + ], + "lines": [ + { + "bbox": [ + 106, + 355, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 106, + 355, + 207, + 370 + ], + "score": 1.0, + "content": "We will call the function", + "type": "text" + }, + { + "bbox": [ + 207, + 356, + 227, + 369 + ], + "score": 0.92, + "content": "f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 355, + 333, + 370 + ], + "score": 1.0, + "content": "a pure neuron detector, as", + "type": "text" + }, + { + "bbox": [ + 333, + 356, + 353, + 368 + ], + "score": 0.91, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 355, + 473, + 370 + ], + "score": 1.0, + "content": "is a pure neuron if and only if", + "type": "text" + }, + { + "bbox": [ + 473, + 356, + 505, + 369 + ], + "score": 0.9, + "content": "f ( u ) =", + "type": "inline_equation" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 366, + 440, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 398, + 380 + ], + "score": 1.0, + "content": "0. Therefore, to finish the algorithm we just need to find all solutions for", + "type": "text" + }, + { + "bbox": [ + 398, + 367, + 437, + 380 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 366, + 440, + 380 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17.5, + "bbox_fs": [ + 105, + 355, + 505, + 380 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 391, + 506, + 506 + ], + "lines": [ + { + "bbox": [ + 105, + 390, + 505, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 390, + 390, + 405 + ], + "score": 1.0, + "content": "Linearization The main obstacle in solving the system of equations", + "type": "text" + }, + { + "bbox": [ + 390, + 392, + 429, + 403 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 390, + 505, + 405 + ], + "score": 1.0, + "content": "is that every entry", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 401, + 506, + 416 + ], + "spans": [ + { + "bbox": [ + 105, + 401, + 118, + 416 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 119, + 402, + 139, + 415 + ], + "score": 0.92, + "content": "f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 140, + 401, + 250, + 416 + ], + "score": 1.0, + "content": "is a quadratic function in", + "type": "text" + }, + { + "bbox": [ + 250, + 405, + 257, + 412 + ], + "score": 0.7, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 401, + 370, + 416 + ], + "score": 1.0, + "content": ". The system of equations", + "type": "text" + }, + { + "bbox": [ + 370, + 403, + 414, + 415 + ], + "score": 0.93, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 414, + 401, + 506, + 416 + ], + "score": 1.0, + "content": "is therefore a system", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 413, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 413, + 506, + 426 + ], + "score": 1.0, + "content": "of quadratic equations. Solving a generic system of quadratic equations is NP-hard. However, in", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 424, + 506, + 437 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 506, + 437 + ], + "score": 1.0, + "content": "our case this can be solved by a technique that is very similar to the FOOBI algorithm for tensor", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 434, + 506, + 449 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 506, + 449 + ], + "score": 1.0, + "content": "decomposition (De Lathauwer et al., 2007). The key idea is to linearize the function by thinking of", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 445, + 504, + 463 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 204, + 463 + ], + "score": 1.0, + "content": "each degree 2 monomial", + "type": "text" + }, + { + "bbox": [ + 205, + 450, + 225, + 460 + ], + "score": 0.87, + "content": "u _ { i } u _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 445, + 438, + 463 + ], + "score": 1.0, + "content": "as a separate variable. Now the number of variables is", + "type": "text" + }, + { + "bbox": [ + 439, + 446, + 504, + 461 + ], + "score": 0.93, + "content": "k _ { 2 } + k = { \\binom { k } { 2 } } + k", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 458, + 507, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 458, + 124, + 476 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 125, + 462, + 132, + 474 + ], + "score": 0.83, + "content": "f", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 458, + 389, + 476 + ], + "score": 1.0, + "content": "is linear in this space. In other words, there exists a matrix", + "type": "text" + }, + { + "bbox": [ + 390, + 460, + 462, + 472 + ], + "score": 0.9, + "content": "T \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 463, + 458, + 507, + 476 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 472, + 506, + 487 + ], + "spans": [ + { + "bbox": [ + 107, + 472, + 194, + 484 + ], + "score": 0.9, + "content": "T \\mathrm { v e c } ^ { * } ( u u _ { - } ^ { \\top } ) = f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 472, + 244, + 487 + ], + "score": 1.0, + "content": ". Clearly, if", + "type": "text" + }, + { + "bbox": [ + 244, + 472, + 263, + 484 + ], + "score": 0.92, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 472, + 357, + 487 + ], + "score": 1.0, + "content": "is a pure neuron, then", + "type": "text" + }, + { + "bbox": [ + 357, + 473, + 466, + 485 + ], + "score": 0.92, + "content": "T \\mathrm { v e c } ^ { * } ( u u ^ { \\top } ) = f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 472, + 506, + 487 + ], + "score": 1.0, + "content": ". That is,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 107, + 483, + 504, + 498 + ], + "spans": [ + { + "bbox": [ + 107, + 484, + 163, + 496 + ], + "score": 0.9, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 164, + 483, + 267, + 498 + ], + "score": 1.0, + "content": "are all in the nullspace of", + "type": "text" + }, + { + "bbox": [ + 268, + 485, + 276, + 494 + ], + "score": 0.77, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 483, + 495, + 498 + ], + "score": 1.0, + "content": ". Later in Section A we will prove that the nullspace of", + "type": "text" + }, + { + "bbox": [ + 496, + 485, + 504, + 494 + ], + "score": 0.83, + "content": "T", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 496, + 339, + 507 + ], + "spans": [ + { + "bbox": [ + 106, + 496, + 339, + 507 + ], + "score": 1.0, + "content": "consists of exactly these vectors (and their combinations):", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 390, + 507, + 507 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 510, + 505, + 547 + ], + "lines": [ + { + "bbox": [ + 104, + 507, + 504, + 526 + ], + "spans": [ + { + "bbox": [ + 104, + 507, + 169, + 526 + ], + "score": 1.0, + "content": "Lemma 4. 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Since", + "type": "text" + }, + { + "bbox": [ + 427, + 138, + 462, + 151 + ], + "score": 0.93, + "content": "\\sigma ( w _ { i } ^ { \\top } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 138, + 505, + 153 + ], + "score": 1.0, + "content": "is always", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 150, + 450, + 164 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 159, + 164 + ], + "score": 1.0, + "content": "nonnegative,", + "type": "text" + }, + { + "bbox": [ + 160, + 150, + 190, + 164 + ], + "score": 0.93, + "content": "\\mathbb { E } [ z _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 151, + 274, + 164 + ], + "score": 1.0, + "content": "has the same sign as", + "type": "text" + }, + { + "bbox": [ + 275, + 152, + 285, + 162 + ], + "score": 0.88, + "content": "\\lambda _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 151, + 351, + 164 + ], + "score": 1.0, + "content": ", and we can flip", + "type": "text" + }, + { + "bbox": [ + 352, + 153, + 361, + 163 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 151, + 371, + 164 + ], + "score": 1.0, + "content": "if", + "type": "text" + }, + { + "bbox": [ + 371, + 151, + 401, + 164 + ], + "score": 0.91, + "content": "\\mathbb { E } [ z _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 151, + 450, + 164 + ], + "score": 1.0, + "content": "is negative.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 3.5 + }, + { + "type": "title", + "bbox": [ + 107, + 180, + 315, + 192 + ], + "lines": [ + { + "bbox": [ + 105, + 180, + 316, + 193 + ], + "spans": [ + { + "bbox": [ + 105, + 180, + 316, + 193 + ], + "score": 1.0, + "content": "3.3 DETAILED ALGORITHM AND GUARANTEES", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 107, + 203, + 505, + 247 + ], + "lines": [ + { + "bbox": [ + 106, + 203, + 505, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 203, + 505, + 215 + ], + "score": 1.0, + "content": "We can now give the full algorithm, see Algorithm 2. The main steps of this algorithm is as ex-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 214, + 506, + 226 + ], + "spans": [ + { + "bbox": [ + 106, + 214, + 257, + 226 + ], + "score": 1.0, + "content": "plained in the previous section. Steps", + "type": "text" + }, + { + "bbox": [ + 257, + 214, + 277, + 224 + ], + "score": 0.28, + "content": "2 \\cdot 5", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 214, + 506, + 226 + ], + "score": 1.0, + "content": "constructs the pure neuron detector and finds the span of", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 224, + 506, + 238 + ], + "spans": [ + { + "bbox": [ + 106, + 224, + 153, + 237 + ], + "score": 0.94, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 225, + 485, + 238 + ], + "score": 1.0, + "content": "(as in Corollary 1); Steps 7 - 9 performs simultaneous diagonalization to get all the", + "type": "text" + }, + { + "bbox": [ + 485, + 226, + 494, + 236 + ], + "score": 0.53, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 225, + 506, + 238 + ], + "score": 1.0, + "content": "’s;", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 236, + 484, + 248 + ], + "spans": [ + { + "bbox": [ + 106, + 236, + 484, + 248 + ], + "score": 1.0, + "content": "Steps 11, 12 calls Algorithm 1 to solve the single-layer problem and outputs the correct result.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5 + }, + { + "type": "title", + "bbox": [ + 107, + 263, + 312, + 275 + ], + "lines": [ + { + "bbox": [ + 106, + 262, + 313, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 262, + 313, + 277 + ], + "score": 1.0, + "content": "Algorithm 2 Learning Two-layer Neural Networks", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "table", + "bbox": [ + 110, + 272, + 506, + 498 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 110, + 272, + 506, + 498 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 272, + 506, + 498 + ], + "spans": [ + { + "bbox": [ + 110, + 272, + 506, + 498 + ], + "score": 0.601, + "html": "
Output: Weight matrices W_and A.Input: Samples (x1, y1),.,(xn, yn) generated according to Equation (4)
1: {Finding span of vec(zizT)’s}
2: Estimate empirical moments E[xxT],E[yxT],E[yx@3] and E[y y (x x)].
3: Compute the vector f(u) = 2E[(uTy).(E[(uTy)xT]E[xxT]-1x)·(xx)]-E[(uTy)²(x凶x)]
where each entry is expressed as a degree-2 polynomial over u.
4:: Construct matrix T ∈ Rd²×(k2+k) such that,Tvec*(uuT) = f(u).
5:Compute the k-least right singular vectors of T,denoted by vec*(U1), vec*(U2),.: , vec*(Uk). Let S be a k2 + k by k matrix, where the i-th column of S is vector vec*(Ui). {Here span S is
equal to span of {vec*(ziz𝑖)}.} 6:{Finding zi's from span}
7: Let X = mat*(SSi), Y = mat*(SS2), where S1 and S2 are two independently sampled k-
8:dimensional standard Gaussian vectors. :Let z1,.,zk be eigenvectors of XY-1.
9:For each zi,ifE[zTy] <O let zi ← -zi. {Here zi's are normalized rows of A-1.}
10:{Reduce to 1-Layer Problem}
11:For each zi,let Ui be the output of Algorithm 1 with input (x1,zi y1),., (xn, zi yn).
13:return V,Z-1.12: Let Z be the matrix whose rows are zT's, V be the matrix whose rows are vi 's.
", + "type": "table", + "image_path": "47f458cfbbd8f97c523797386fdd380ab04c8d6d78284f7eb1e55929d6ba10e7.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 110, + 272, + 506, + 347.3333333333333 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 110, + 347.3333333333333, + 506, + 422.66666666666663 + ], + "spans": [], + "index": 13 + }, + { + "bbox": [ + 110, + 422.66666666666663, + 506, + 497.99999999999994 + ], + "spans": [], + "index": 14 + } + ] + } + ], + "index": 13 + }, + { + "type": "text", + "bbox": [ + 106, + 514, + 338, + 526 + ], + "lines": [ + { + "bbox": [ + 106, + 514, + 339, + 527 + ], + "spans": [ + { + "bbox": [ + 106, + 514, + 339, + 527 + ], + "score": 1.0, + "content": "We are now ready to state a formal version of Theorem 1:", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 107, + 531, + 505, + 564 + ], + "lines": [ + { + "bbox": [ + 105, + 530, + 505, + 544 + ], + "spans": [ + { + "bbox": [ + 105, + 531, + 195, + 544 + ], + "score": 1.0, + "content": "Theorem 4. Suppose", + "type": "text" + }, + { + "bbox": [ + 195, + 530, + 252, + 543 + ], + "score": 0.91, + "content": "A , W , \\mathbb { E } [ x x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 531, + 371, + 544 + ], + "score": 1.0, + "content": "and the distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 371, + 532, + 381, + 541 + ], + "score": 0.56, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 531, + 505, + 544 + ], + "score": 1.0, + "content": "are all full rank, and Algorith-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 542, + 505, + 555 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 505, + 555 + ], + "score": 1.0, + "content": "m 2 has access to the exact moments, then the network returned by the algorithm computes exactly", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 553, + 304, + 565 + ], + "spans": [ + { + "bbox": [ + 106, + 553, + 304, + 565 + ], + "score": 1.0, + "content": "the same function as the original neural network.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17 + }, + { + "type": "text", + "bbox": [ + 106, + 576, + 340, + 587 + ], + "lines": [ + { + "bbox": [ + 105, + 575, + 342, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 575, + 342, + 589 + ], + "score": 1.0, + "content": "It is easy to prove this theorem using the lemmas we have.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19 + }, + { + "type": "text", + "bbox": [ + 106, + 612, + 505, + 680 + ], + "lines": [ + { + "bbox": [ + 106, + 612, + 506, + 625 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 485, + 625 + ], + "score": 1.0, + "content": "Proof. By Corollary 1, we know that after Step 5 of Algorithm 2, the span of columns of", + "type": "text" + }, + { + "bbox": [ + 486, + 613, + 493, + 623 + ], + "score": 0.83, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 612, + 506, + 625 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 622, + 507, + 636 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 222, + 636 + ], + "score": 1.0, + "content": "exactly equal to the span of", + "type": "text" + }, + { + "bbox": [ + 223, + 623, + 279, + 636 + ], + "score": 0.94, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 622, + 464, + 636 + ], + "score": 1.0, + "content": ". By Lemma 5, we know the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 465, + 623, + 493, + 634 + ], + "score": 0.93, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 622, + 507, + 636 + ], + "score": 1.0, + "content": "at", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 634, + 506, + 647 + ], + "spans": [ + { + "bbox": [ + 106, + 634, + 323, + 647 + ], + "score": 1.0, + "content": "Step 8 are exactly the normalized version of rows of", + "type": "text" + }, + { + "bbox": [ + 323, + 634, + 342, + 645 + ], + "score": 0.91, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 342, + 634, + 506, + 647 + ], + "score": 1.0, + "content": ". Without loss of generality, we will fix", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 645, + 504, + 659 + ], + "spans": [ + { + "bbox": [ + 105, + 645, + 221, + 659 + ], + "score": 1.0, + "content": "the permutation and assume", + "type": "text" + }, + { + "bbox": [ + 222, + 645, + 276, + 658 + ], + "score": 0.93, + "content": "z _ { i } ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 645, + 404, + 659 + ], + "score": 1.0, + "content": ". In Step 9, we use the fact that", + "type": "text" + }, + { + "bbox": [ + 405, + 645, + 504, + 658 + ], + "score": 0.91, + "content": "\\mathbb { E } [ \\breve { z } _ { i } ^ { \\top } y ] = \\bar { \\lambda } _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]", + "type": "inline_equation" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 657, + 506, + 671 + ], + "spans": [ + { + "bbox": [ + 106, + 657, + 134, + 671 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 657, + 181, + 670 + ], + "score": 0.94, + "content": "\\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 657, + 292, + 671 + ], + "score": 1.0, + "content": "is always positive because", + "type": "text" + }, + { + "bbox": [ + 293, + 660, + 300, + 668 + ], + "score": 0.78, + "content": "\\sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 657, + 506, + 671 + ], + "score": 1.0, + "content": "is the ReLU function. Therefore, after Step 9 we", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 669, + 250, + 681 + ], + "spans": [ + { + "bbox": [ + 106, + 669, + 182, + 681 + ], + "score": 1.0, + "content": "can assume all the", + "type": "text" + }, + { + "bbox": [ + 182, + 669, + 192, + 680 + ], + "score": 0.87, + "content": "\\lambda _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 669, + 250, + 681 + ], + "score": 1.0, + "content": "’s are positive.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 22.5 + }, + { + "type": "text", + "bbox": [ + 107, + 684, + 504, + 730 + ], + "lines": [ + { + "bbox": [ + 105, + 684, + 506, + 698 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 174, + 698 + ], + "score": 1.0, + "content": "Now the output", + "type": "text" + }, + { + "bbox": [ + 175, + 684, + 316, + 698 + ], + "score": 0.91, + "content": "z _ { i } ^ { \\top } y = \\lambda _ { i } \\sigma ( w _ { i } ^ { \\top } x ) = \\sigma ( \\lambda _ { i } w _ { i } ^ { \\top } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 684, + 476, + 698 + ], + "score": 1.0, + "content": "(again by property of ReLU function", + "type": "text" + }, + { + "bbox": [ + 477, + 688, + 484, + 695 + ], + "score": 0.69, + "content": "\\sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 484, + 684, + 506, + 698 + ], + "score": 1.0, + "content": "), by", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 696, + 506, + 709 + ], + "spans": [ + { + "bbox": [ + 105, + 696, + 256, + 709 + ], + "score": 1.0, + "content": "the design of Algorithm 1 we know", + "type": "text" + }, + { + "bbox": [ + 257, + 698, + 301, + 707 + ], + "score": 0.88, + "content": "v _ { i } = \\lambda _ { i } w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 696, + 388, + 709 + ], + "score": 1.0, + "content": ". We also know that", + "type": "text" + }, + { + "bbox": [ + 388, + 696, + 461, + 708 + ], + "score": 0.91, + "content": "\\dot { Z } = \\mathrm { d i a g } ( \\lambda ) A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 696, + 506, + 709 + ], + "score": 1.0, + "content": ", therefore", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 705, + 506, + 721 + ], + "spans": [ + { + "bbox": [ + 107, + 707, + 191, + 720 + ], + "score": 0.92, + "content": "Z ^ { - 1 } = \\mathbf { \\bar { \\Phi } } _ { A \\mathrm { d i a g } ( \\bar { \\lambda } ) ^ { - 1 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 705, + 246, + 721 + ], + "score": 1.0, + "content": ". Notice that", + "type": "text" + }, + { + "bbox": [ + 246, + 707, + 474, + 720 + ], + "score": 0.86, + "content": "Z ^ { - 1 } \\sigma ( V x ) = { \\cal A } \\mathrm { d i a g } ( \\lambda ) ^ { - 1 } \\sigma ( \\mathrm { d i a g } ( \\lambda ) W x ) = { \\cal A } \\sigma ( W x )", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 705, + 506, + 721 + ], + "score": 1.0, + "content": ". These", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 718, + 506, + 731 + ], + "spans": [ + { + "bbox": [ + 105, + 718, + 453, + 731 + ], + "score": 1.0, + "content": "two scaling factors cancel each other, so the two networks compute the same function.", + "type": "text" + }, + { + "bbox": [ + 494, + 718, + 506, + 729 + ], + "score": 1.0, + "content": "□", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27.5 + } + ], + "page_idx": 7, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 308, + 760 + ], + "lines": [ + { + "bbox": [ + 300, + 750, + 309, + 761 + ], + "spans": [ + { + "bbox": [ + 300, + 750, + 309, + 761 + ], + "score": 1.0, + "content": "8", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 505, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 225, + 96 + ], + "score": 1.0, + "content": "Lemma 5. Given the span of", + "type": "text" + }, + { + "bbox": [ + 225, + 82, + 254, + 95 + ], + "score": 0.91, + "content": "z _ { i } z _ { i } ^ { \\top } \\mathbf { \\Sigma } ^ { \\prime } s ,", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 81, + 268, + 96 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 268, + 83, + 291, + 93 + ], + "score": 0.76, + "content": "X , Y", + "type": "inline_equation" + }, + { + "bbox": [ + 291, + 81, + 505, + 96 + ], + "score": 1.0, + "content": "be two random matrices in this span, with probability", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 104, + 92, + 290, + 106 + ], + "spans": [ + { + "bbox": [ + 104, + 92, + 128, + 106 + ], + "score": 1.0, + "content": "1 the", + "type": "text" + }, + { + "bbox": [ + 128, + 95, + 138, + 105 + ], + "score": 0.57, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 92, + 258, + 106 + ], + "score": 1.0, + "content": "’s are the only eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 259, + 93, + 286, + 104 + ], + "score": 0.89, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 92, + 290, + 106 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 104, + 81, + 505, + 106 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 116, + 505, + 163 + ], + "lines": [ + { + "bbox": [ + 105, + 115, + 506, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 275, + 129 + ], + "score": 1.0, + "content": "Using this procedure we can find all the", + "type": "text" + }, + { + "bbox": [ + 275, + 118, + 284, + 127 + ], + "score": 0.81, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 115, + 506, + 129 + ], + "score": 1.0, + "content": "’s (up to permutations and sign flip). Without loss of", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 126, + 505, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 198, + 140 + ], + "score": 1.0, + "content": "generality we assume", + "type": "text" + }, + { + "bbox": [ + 198, + 126, + 256, + 140 + ], + "score": 0.93, + "content": "z _ { i } ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 127, + 414, + 140 + ], + "score": 1.0, + "content": ". The only remaining problem is that", + "type": "text" + }, + { + "bbox": [ + 414, + 128, + 424, + 138 + ], + "score": 0.89, + "content": "\\lambda _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 127, + 505, + 140 + ], + "score": 1.0, + "content": "might be negative.", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 138, + 505, + 153 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 289, + 153 + ], + "score": 1.0, + "content": "However, this is easily fixable by checking", + "type": "text" + }, + { + "bbox": [ + 289, + 138, + 392, + 151 + ], + "score": 0.93, + "content": "\\mathbb { E } [ z _ { i } ^ { \\top } y ] ~ = ~ \\lambda _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 138, + 427, + 153 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 427, + 138, + 462, + 151 + ], + "score": 0.93, + "content": "\\sigma ( w _ { i } ^ { \\top } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 138, + 505, + 153 + ], + "score": 1.0, + "content": "is always", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 150, + 450, + 164 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 159, + 164 + ], + "score": 1.0, + "content": "nonnegative,", + "type": "text" + }, + { + "bbox": [ + 160, + 150, + 190, + 164 + ], + "score": 0.93, + "content": "\\mathbb { E } [ z _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 151, + 274, + 164 + ], + "score": 1.0, + "content": "has the same sign as", + "type": "text" + }, + { + "bbox": [ + 275, + 152, + 285, + 162 + ], + "score": 0.88, + "content": "\\lambda _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 151, + 351, + 164 + ], + "score": 1.0, + "content": ", and we can flip", + "type": "text" + }, + { + "bbox": [ + 352, + 153, + 361, + 163 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 151, + 371, + 164 + ], + "score": 1.0, + "content": "if", + "type": "text" + }, + { + "bbox": [ + 371, + 151, + 401, + 164 + ], + "score": 0.91, + "content": "\\mathbb { E } [ z _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 151, + 450, + 164 + ], + "score": 1.0, + "content": "is negative.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 3.5, + "bbox_fs": [ + 105, + 115, + 506, + 164 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 180, + 315, + 192 + ], + "lines": [ + { + "bbox": [ + 105, + 180, + 316, + 193 + ], + "spans": [ + { + "bbox": [ + 105, + 180, + 316, + 193 + ], + "score": 1.0, + "content": "3.3 DETAILED ALGORITHM AND GUARANTEES", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 107, + 203, + 505, + 247 + ], + "lines": [ + { + "bbox": [ + 106, + 203, + 505, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 203, + 505, + 215 + ], + "score": 1.0, + "content": "We can now give the full algorithm, see Algorithm 2. The main steps of this algorithm is as ex-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 214, + 506, + 226 + ], + "spans": [ + { + "bbox": [ + 106, + 214, + 257, + 226 + ], + "score": 1.0, + "content": "plained in the previous section. Steps", + "type": "text" + }, + { + "bbox": [ + 257, + 214, + 277, + 224 + ], + "score": 0.28, + "content": "2 \\cdot 5", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 214, + 506, + 226 + ], + "score": 1.0, + "content": "constructs the pure neuron detector and finds the span of", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 224, + 506, + 238 + ], + "spans": [ + { + "bbox": [ + 106, + 224, + 153, + 237 + ], + "score": 0.94, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 225, + 485, + 238 + ], + "score": 1.0, + "content": "(as in Corollary 1); Steps 7 - 9 performs simultaneous diagonalization to get all the", + "type": "text" + }, + { + "bbox": [ + 485, + 226, + 494, + 236 + ], + "score": 0.53, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 225, + 506, + 238 + ], + "score": 1.0, + "content": "’s;", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 236, + 484, + 248 + ], + "spans": [ + { + "bbox": [ + 106, + 236, + 484, + 248 + ], + "score": 1.0, + "content": "Steps 11, 12 calls Algorithm 1 to solve the single-layer problem and outputs the correct result.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5, + "bbox_fs": [ + 106, + 203, + 506, + 248 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 263, + 312, + 275 + ], + "lines": [ + { + "bbox": [ + 106, + 262, + 313, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 262, + 313, + 277 + ], + "score": 1.0, + "content": "Algorithm 2 Learning Two-layer Neural Networks", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "table", + "bbox": [ + 110, + 272, + 506, + 498 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 110, + 272, + 506, + 498 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 272, + 506, + 498 + ], + "spans": [ + { + "bbox": [ + 110, + 272, + 506, + 498 + ], + "score": 0.601, + "html": "
Output: Weight matrices W_and A.Input: Samples (x1, y1),.,(xn, yn) generated according to Equation (4)
1: {Finding span of vec(zizT)’s}
2: Estimate empirical moments E[xxT],E[yxT],E[yx@3] and E[y y (x x)].
3: Compute the vector f(u) = 2E[(uTy).(E[(uTy)xT]E[xxT]-1x)·(xx)]-E[(uTy)²(x凶x)]
where each entry is expressed as a degree-2 polynomial over u.
4:: Construct matrix T ∈ Rd²×(k2+k) such that,Tvec*(uuT) = f(u).
5:Compute the k-least right singular vectors of T,denoted by vec*(U1), vec*(U2),.: , vec*(Uk). Let S be a k2 + k by k matrix, where the i-th column of S is vector vec*(Ui). {Here span S is
equal to span of {vec*(ziz𝑖)}.} 6:{Finding zi's from span}
7: Let X = mat*(SSi), Y = mat*(SS2), where S1 and S2 are two independently sampled k-
8:dimensional standard Gaussian vectors. :Let z1,.,zk be eigenvectors of XY-1.
9:For each zi,ifE[zTy] <O let zi ← -zi. {Here zi's are normalized rows of A-1.}
10:{Reduce to 1-Layer Problem}
11:For each zi,let Ui be the output of Algorithm 1 with input (x1,zi y1),., (xn, zi yn).
13:return V,Z-1.12: Let Z be the matrix whose rows are zT's, V be the matrix whose rows are vi 's.
", + "type": "table", + "image_path": "47f458cfbbd8f97c523797386fdd380ab04c8d6d78284f7eb1e55929d6ba10e7.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 110, + 272, + 506, + 347.3333333333333 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 110, + 347.3333333333333, + 506, + 422.66666666666663 + ], + "spans": [], + "index": 13 + }, + { + "bbox": [ + 110, + 422.66666666666663, + 506, + 497.99999999999994 + ], + "spans": [], + "index": 14 + } + ] + } + ], + "index": 13 + }, + { + "type": "text", + "bbox": [ + 106, + 514, + 338, + 526 + ], + "lines": [ + { + "bbox": [ + 106, + 514, + 339, + 527 + ], + "spans": [ + { + "bbox": [ + 106, + 514, + 339, + 527 + ], + "score": 1.0, + "content": "We are now ready to state a formal version of Theorem 1:", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 15, + "bbox_fs": [ + 106, + 514, + 339, + 527 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 531, + 505, + 564 + ], + "lines": [ + { + "bbox": [ + 105, + 530, + 505, + 544 + ], + "spans": [ + { + "bbox": [ + 105, + 531, + 195, + 544 + ], + "score": 1.0, + "content": "Theorem 4. Suppose", + "type": "text" + }, + { + "bbox": [ + 195, + 530, + 252, + 543 + ], + "score": 0.91, + "content": "A , W , \\mathbb { E } [ x x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 531, + 371, + 544 + ], + "score": 1.0, + "content": "and the distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 371, + 532, + 381, + 541 + ], + "score": 0.56, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 531, + 505, + 544 + ], + "score": 1.0, + "content": "are all full rank, and Algorith-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 542, + 505, + 555 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 505, + 555 + ], + "score": 1.0, + "content": "m 2 has access to the exact moments, then the network returned by the algorithm computes exactly", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 553, + 304, + 565 + ], + "spans": [ + { + "bbox": [ + 106, + 553, + 304, + 565 + ], + "score": 1.0, + "content": "the same function as the original neural network.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17, + "bbox_fs": [ + 105, + 530, + 505, + 565 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 576, + 340, + 587 + ], + "lines": [ + { + "bbox": [ + 105, + 575, + 342, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 575, + 342, + 589 + ], + "score": 1.0, + "content": "It is easy to prove this theorem using the lemmas we have.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19, + "bbox_fs": [ + 105, + 575, + 342, + 589 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 612, + 505, + 680 + ], + "lines": [ + { + "bbox": [ + 106, + 612, + 506, + 625 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 485, + 625 + ], + "score": 1.0, + "content": "Proof. By Corollary 1, we know that after Step 5 of Algorithm 2, the span of columns of", + "type": "text" + }, + { + "bbox": [ + 486, + 613, + 493, + 623 + ], + "score": 0.83, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 612, + 506, + 625 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 622, + 507, + 636 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 222, + 636 + ], + "score": 1.0, + "content": "exactly equal to the span of", + "type": "text" + }, + { + "bbox": [ + 223, + 623, + 279, + 636 + ], + "score": 0.94, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 622, + 464, + 636 + ], + "score": 1.0, + "content": ". By Lemma 5, we know the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 465, + 623, + 493, + 634 + ], + "score": 0.93, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 622, + 507, + 636 + ], + "score": 1.0, + "content": "at", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 634, + 506, + 647 + ], + "spans": [ + { + "bbox": [ + 106, + 634, + 323, + 647 + ], + "score": 1.0, + "content": "Step 8 are exactly the normalized version of rows of", + "type": "text" + }, + { + "bbox": [ + 323, + 634, + 342, + 645 + ], + "score": 0.91, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 342, + 634, + 506, + 647 + ], + "score": 1.0, + "content": ". Without loss of generality, we will fix", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 645, + 504, + 659 + ], + "spans": [ + { + "bbox": [ + 105, + 645, + 221, + 659 + ], + "score": 1.0, + "content": "the permutation and assume", + "type": "text" + }, + { + "bbox": [ + 222, + 645, + 276, + 658 + ], + "score": 0.93, + "content": "z _ { i } ^ { \\top } A = \\lambda _ { i } e _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 645, + 404, + 659 + ], + "score": 1.0, + "content": ". In Step 9, we use the fact that", + "type": "text" + }, + { + "bbox": [ + 405, + 645, + 504, + 658 + ], + "score": 0.91, + "content": "\\mathbb { E } [ \\breve { z } _ { i } ^ { \\top } y ] = \\bar { \\lambda } _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]", + "type": "inline_equation" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 657, + 506, + 671 + ], + "spans": [ + { + "bbox": [ + 106, + 657, + 134, + 671 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 657, + 181, + 670 + ], + "score": 0.94, + "content": "\\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 657, + 292, + 671 + ], + "score": 1.0, + "content": "is always positive because", + "type": "text" + }, + { + "bbox": [ + 293, + 660, + 300, + 668 + ], + "score": 0.78, + "content": "\\sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 657, + 506, + 671 + ], + "score": 1.0, + "content": "is the ReLU function. Therefore, after Step 9 we", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 669, + 250, + 681 + ], + "spans": [ + { + "bbox": [ + 106, + 669, + 182, + 681 + ], + "score": 1.0, + "content": "can assume all the", + "type": "text" + }, + { + "bbox": [ + 182, + 669, + 192, + 680 + ], + "score": 0.87, + "content": "\\lambda _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 669, + 250, + 681 + ], + "score": 1.0, + "content": "’s are positive.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 22.5, + "bbox_fs": [ + 105, + 612, + 507, + 681 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 684, + 504, + 730 + ], + "lines": [ + { + "bbox": [ + 105, + 684, + 506, + 698 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 174, + 698 + ], + "score": 1.0, + "content": "Now the output", + "type": "text" + }, + { + "bbox": [ + 175, + 684, + 316, + 698 + ], + "score": 0.91, + "content": "z _ { i } ^ { \\top } y = \\lambda _ { i } \\sigma ( w _ { i } ^ { \\top } x ) = \\sigma ( \\lambda _ { i } w _ { i } ^ { \\top } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 684, + 476, + 698 + ], + "score": 1.0, + "content": "(again by property of ReLU function", + "type": "text" + }, + { + "bbox": [ + 477, + 688, + 484, + 695 + ], + "score": 0.69, + "content": "\\sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 484, + 684, + 506, + 698 + ], + "score": 1.0, + "content": "), by", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 696, + 506, + 709 + ], + "spans": [ + { + "bbox": [ + 105, + 696, + 256, + 709 + ], + "score": 1.0, + "content": "the design of Algorithm 1 we know", + "type": "text" + }, + { + "bbox": [ + 257, + 698, + 301, + 707 + ], + "score": 0.88, + "content": "v _ { i } = \\lambda _ { i } w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 696, + 388, + 709 + ], + "score": 1.0, + "content": ". We also know that", + "type": "text" + }, + { + "bbox": [ + 388, + 696, + 461, + 708 + ], + "score": 0.91, + "content": "\\dot { Z } = \\mathrm { d i a g } ( \\lambda ) A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 696, + 506, + 709 + ], + "score": 1.0, + "content": ", therefore", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 705, + 506, + 721 + ], + "spans": [ + { + "bbox": [ + 107, + 707, + 191, + 720 + ], + "score": 0.92, + "content": "Z ^ { - 1 } = \\mathbf { \\bar { \\Phi } } _ { A \\mathrm { d i a g } ( \\bar { \\lambda } ) ^ { - 1 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 705, + 246, + 721 + ], + "score": 1.0, + "content": ". Notice that", + "type": "text" + }, + { + "bbox": [ + 246, + 707, + 474, + 720 + ], + "score": 0.86, + "content": "Z ^ { - 1 } \\sigma ( V x ) = { \\cal A } \\mathrm { d i a g } ( \\lambda ) ^ { - 1 } \\sigma ( \\mathrm { d i a g } ( \\lambda ) W x ) = { \\cal A } \\sigma ( W x )", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 705, + 506, + 721 + ], + "score": 1.0, + "content": ". 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Each point is the result of averaging across five trials, where", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 198, + 505, + 212 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 150, + 212 + ], + "score": 1.0, + "content": "on the left", + "type": "text" + }, + { + "bbox": [ + 151, + 199, + 163, + 209 + ], + "score": 0.57, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 198, + 181, + 212 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 182, + 200, + 191, + 209 + ], + "score": 0.69, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 198, + 299, + 212 + ], + "score": 1.0, + "content": "are both drawn as random", + "type": "text" + }, + { + "bbox": [ + 300, + 199, + 334, + 210 + ], + "score": 0.9, + "content": "1 0 \\times 1 0", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 198, + 505, + 212 + ], + "score": 1.0, + "content": "orthonormal matrices and in the center as", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 209, + 505, + 223 + ], + "spans": [ + { + "bbox": [ + 106, + 210, + 140, + 221 + ], + "score": 0.9, + "content": "3 2 \\times 3 2", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 209, + 505, + 223 + ], + "score": 1.0, + "content": "orthonormal matrices. On the right, given 10, 000 training samples we plot the square root", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 220, + 505, + 234 + ], + "spans": [ + { + "bbox": [ + 105, + 220, + 328, + 234 + ], + "score": 1.0, + "content": "of the algorithm’s error normalized by the dimension of", + "type": "text" + }, + { + "bbox": [ + 328, + 222, + 340, + 231 + ], + "score": 0.49, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 220, + 358, + 234 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 358, + 222, + 366, + 231 + ], + "score": 0.71, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 367, + 220, + 505, + 234 + ], + "score": 1.0, + "content": ", which are again drawn as random", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 232, + 382, + 245 + ], + "spans": [ + { + "bbox": [ + 105, + 232, + 382, + 245 + ], + "score": 1.0, + "content": "orthonormal matrices. The input distribution is a spherical Gaussian.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 5.5 + } + ], + "index": 3.25 + }, + { + "type": "title", + "bbox": [ + 108, + 265, + 200, + 277 + ], + "lines": [ + { + "bbox": [ + 105, + 264, + 201, + 280 + ], + "spans": [ + { + "bbox": [ + 105, + 264, + 201, + 280 + ], + "score": 1.0, + "content": "4 EXPERIMENTS", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 108, + 291, + 504, + 324 + ], + "lines": [ + { + "bbox": [ + 106, + 291, + 505, + 303 + ], + "spans": [ + { + "bbox": [ + 106, + 291, + 505, + 303 + ], + "score": 1.0, + "content": "In this section, we provide experimental results to validate the robustness of our algorithm for both", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 302, + 505, + 315 + ], + "spans": [ + { + "bbox": [ + 106, + 302, + 505, + 315 + ], + "score": 1.0, + "content": "Gaussian input distributions as well as more general symmetric distributions such as symmetric", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 312, + 200, + 325 + ], + "spans": [ + { + "bbox": [ + 106, + 312, + 200, + 325 + ], + "score": 1.0, + "content": "mixtures of Gaussians.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 107, + 330, + 505, + 483 + ], + "lines": [ + { + "bbox": [ + 106, + 329, + 505, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 329, + 505, + 342 + ], + "score": 1.0, + "content": "There are two important ways in which our implementation differs from our description in Sec-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 340, + 505, + 354 + ], + "spans": [ + { + "bbox": [ + 105, + 340, + 505, + 354 + ], + "score": 1.0, + "content": "tion 3.3. First, our description of the simultaneous diagonalization step in our algorithm is mostly", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "score": 1.0, + "content": "for simplicity of both stating and proving the algorithm. 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As alternating least squares can also be unstable", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 396, + 504, + 408 + ], + "spans": [ + { + "bbox": [ + 105, + 396, + 495, + 408 + ], + "score": 1.0, + "content": "we repeat this step 10 times and select the best one. Second, once we have recovered and fixed", + "type": "text" + }, + { + "bbox": [ + 495, + 396, + 504, + 406 + ], + "score": 0.63, + "content": "A", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 405, + 506, + 421 + ], + "spans": [ + { + "bbox": [ + 104, + 405, + 239, + 421 + ], + "score": 1.0, + "content": "we use gradient descent to learn", + "type": "text" + }, + { + "bbox": [ + 239, + 407, + 251, + 417 + ], + "score": 0.5, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 405, + 506, + 421 + ], + "score": 1.0, + "content": ", which compared to Algorithm 1 does a better job of ensuring", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 417, + 506, + 431 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 426, + 431 + ], + "score": 1.0, + "content": "the overall error will not explode even if there is significant error in recovering", + "type": "text" + }, + { + "bbox": [ + 426, + 418, + 435, + 428 + ], + "score": 0.51, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 417, + 506, + 431 + ], + "score": 1.0, + "content": ". Crucially, these", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 428, + 506, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 506, + 442 + ], + "score": 1.0, + "content": "modifications are not necessary when the number of samples is large enough. 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As illustrated by Figure 2, regardless of", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 553, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 553, + 151, + 565 + ], + "score": 1.0, + "content": "the size of", + "type": "text" + }, + { + "bbox": [ + 152, + 553, + 164, + 563 + ], + "score": 0.75, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 164, + 553, + 183, + 565 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 183, + 553, + 192, + 563 + ], + "score": 0.75, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 553, + 506, + 565 + ], + "score": 1.0, + "content": "our algorithm is able to recover both weight matrices with minimal error so", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "score": 1.0, + "content": "long as the number of samples is a few times of the number of parameters. To measure the error", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 575, + 505, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 575, + 162, + 587 + ], + "score": 1.0, + "content": "in recovering", + "type": "text" + }, + { + "bbox": [ + 163, + 575, + 172, + 585 + ], + "score": 0.71, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 575, + 190, + 587 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 191, + 575, + 202, + 585 + ], + "score": 0.68, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 575, + 346, + 587 + ], + "score": 1.0, + "content": ", we first normalize the columns of", + "type": "text" + }, + { + "bbox": [ + 347, + 575, + 355, + 585 + ], + "score": 0.75, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 356, + 575, + 407, + 587 + ], + "score": 1.0, + "content": "and rows of", + "type": "text" + }, + { + "bbox": [ + 408, + 575, + 420, + 585 + ], + "score": 0.53, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 575, + 505, + 587 + ], + "score": 1.0, + "content": "for both our learned", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 586, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 586, + 506, + 598 + ], + "score": 1.0, + "content": "parameters and the ground truth, pair corresponding columns and rows together, and then compute", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 597, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 597, + 506, + 609 + ], + "score": 1.0, + "content": "the squared distance between learned and ground truth parameters. Note in the rightmost plot of", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 608, + 506, + 620 + ], + "spans": [ + { + "bbox": [ + 105, + 608, + 506, + 620 + ], + "score": 1.0, + "content": "Figure 2, in order to compare the performance between different dimensions, we further normalize", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 618, + 505, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 618, + 275, + 631 + ], + "score": 1.0, + "content": "the recovering error by the dimension of", + "type": "text" + }, + { + "bbox": [ + 275, + 618, + 287, + 628 + ], + "score": 0.59, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 618, + 307, + 631 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 307, + 619, + 315, + 628 + ], + "score": 0.71, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 618, + 505, + 631 + ], + "score": 1.0, + "content": ". It shows that the squared root of normalized", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 630, + 505, + 642 + ], + "spans": [ + { + "bbox": [ + 105, + 630, + 270, + 642 + ], + "score": 1.0, + "content": "error remains stable as the dimension of", + "type": "text" + }, + { + "bbox": [ + 270, + 630, + 279, + 639 + ], + "score": 0.72, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 630, + 297, + 642 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 297, + 630, + 309, + 640 + ], + "score": 0.54, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 630, + 505, + 642 + ], + "score": 1.0, + "content": "grows from 10 to 32. 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As alternating least squares can also be unstable", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 396, + 504, + 408 + ], + "spans": [ + { + "bbox": [ + 105, + 396, + 495, + 408 + ], + "score": 1.0, + "content": "we repeat this step 10 times and select the best one. 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As illustrated by Figure 2, regardless of", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 553, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 553, + 151, + 565 + ], + "score": 1.0, + "content": "the size of", + "type": "text" + }, + { + "bbox": [ + 152, + 553, + 164, + 563 + ], + "score": 0.75, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 164, + 553, + 183, + 565 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 183, + 553, + 192, + 563 + ], + "score": 0.75, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 553, + 506, + 565 + ], + "score": 1.0, + "content": "our algorithm is able to recover both weight matrices with minimal error so", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "score": 1.0, + "content": "long as the number of samples is a few times of the number of parameters. 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Recovery guarantees", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 115, + 604, + 434, + 617 + ], + "spans": [ + { + "bbox": [ + 115, + 604, + 434, + 617 + ], + "score": 1.0, + "content": "for one-hidden-layer neural networks. arXiv preprint arXiv:1706.03175, 2017.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35.5, + "bbox_fs": [ + 105, + 592, + 505, + 617 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 81, + 284, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 80, + 286, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 80, + 286, + 96 + ], + "score": 1.0, + "content": "A DETAILS OF EXACT ANALYSIS", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 107, + 105, + 505, + 150 + ], + "lines": [ + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "score": 1.0, + "content": "In this section, we first provide the missing proofs for the lemmas appeared in Section 3. Then we", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 115, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 277, + 129 + ], + "score": 1.0, + "content": "discuss how to handle the noise case (i.e.", + "type": "text" + }, + { + "bbox": [ + 277, + 116, + 350, + 128 + ], + "score": 0.93, + "content": "\\overset { \\cdot } { \\boldsymbol { y } } = \\sigma ( W \\boldsymbol { x } ) + \\boldsymbol { \\xi } )", + "type": "inline_equation" + }, + { + "bbox": [ + 350, + 115, + 505, + 129 + ], + "score": 1.0, + "content": "and give the corresponding algorithm", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 127, + 505, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 478, + 140 + ], + "score": 1.0, + "content": "(Algorithm 3). 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Here we provide a more general version (Lemma 6)", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 237, + 506, + 250 + ], + "spans": [ + { + "bbox": [ + 105, + 237, + 457, + 250 + ], + "score": 1.0, + "content": "instead of proving the specific Lemma 1. Note that Lemma 1 is the special case when", + "type": "text" + }, + { + "bbox": [ + 458, + 239, + 487, + 248 + ], + "score": 0.88, + "content": "a = w", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 237, + 506, + 250 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 247, + 506, + 262 + ], + "spans": [ + { + "bbox": [ + 107, + 249, + 151, + 260 + ], + "score": 0.87, + "content": "p = q = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 247, + 176, + 262 + ], + "score": 1.0, + "content": "(here", + "type": "text" + }, + { + "bbox": [ + 176, + 249, + 182, + 260 + ], + "score": 0.78, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 247, + 475, + 262 + ], + "score": 1.0, + "content": "does not affect the result since it has zero mean and is independent with", + "type": "text" + }, + { + "bbox": [ + 475, + 251, + 482, + 259 + ], + "score": 0.78, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 247, + 506, + 262 + ], + "score": 1.0, + "content": ", thus", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 259, + 202, + 273 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 198, + 272 + ], + "score": 0.89, + "content": "\\mathbb { \\tilde { E } } [ y x ] = \\mathbb { E } [ \\sigma ( w ^ { \\top } x ) x ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 259, + 202, + 273 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 105, + 273, + 504, + 295 + ], + "lines": [ + { + "bbox": [ + 105, + 272, + 505, + 286 + ], + "spans": [ + { + "bbox": [ + 105, + 272, + 214, + 286 + ], + "score": 1.0, + "content": "Lemma 6. Suppose input", + "type": "text" + }, + { + "bbox": [ + 215, + 276, + 221, + 283 + ], + "score": 0.49, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 222, + 272, + 436, + 286 + ], + "score": 1.0, + "content": "comes from a symmetric distribution, for any vector", + "type": "text" + }, + { + "bbox": [ + 436, + 272, + 469, + 283 + ], + "score": 0.92, + "content": "a \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 469, + 272, + 505, + 286 + ], + "score": 1.0, + "content": "and any", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 284, + 421, + 296 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 194, + 296 + ], + "score": 1.0, + "content": "non-negative integers", + "type": "text" + }, + { + "bbox": [ + 195, + 286, + 201, + 295 + ], + "score": 0.34, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 284, + 219, + 296 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 219, + 286, + 226, + 295 + ], + "score": 0.67, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 284, + 285, + 296 + ], + "score": 1.0, + "content": "satisfying that", + "type": "text" + }, + { + "bbox": [ + 285, + 285, + 309, + 295 + ], + "score": 0.89, + "content": "p + q", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 284, + 421, + 296 + ], + "score": 1.0, + "content": "is an even number, we have", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 13.5 + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 296, + 385, + 319 + ], + "lines": [ + { + "bbox": [ + 225, + 296, + 385, + 319 + ], + "spans": [ + { + "bbox": [ + 225, + 296, + 385, + 319 + ], + "score": 0.93, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] ,", + "type": "interline_equation", + "image_path": "752c6267837d1d801e50adf0e29663e9647bb1e4fa5a22cc59e514227b88b5db.jpg" + } + ] + } + ], + "index": 15, + "virtual_lines": [ + { + "bbox": [ + 225, + 296, + 385, + 319 + ], + "spans": [], + "index": 15 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 320, + 335, + 331 + ], + "lines": [ + { + "bbox": [ + 106, + 319, + 336, + 333 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 336, + 333 + ], + "score": 1.0, + "content": "where the expectation is taken over the input distribution.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 16 + }, + { + "type": "text", + "bbox": [ + 106, + 343, + 505, + 370 + ], + "lines": [ + { + "bbox": [ + 104, + 342, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 104, + 342, + 186, + 358 + ], + "score": 1.0, + "content": "Proof. Since input", + "type": "text" + }, + { + "bbox": [ + 186, + 347, + 193, + 354 + ], + "score": 0.74, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 342, + 413, + 358 + ], + "score": 1.0, + "content": "comes from a symmetric distribution, we know that", + "type": "text" + }, + { + "bbox": [ + 414, + 343, + 505, + 358 + ], + "score": 0.9, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] \\ =", + "type": "inline_equation" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 356, + 273, + 371 + ], + "spans": [ + { + "bbox": [ + 106, + 356, + 208, + 371 + ], + "score": 0.91, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } ( - x ) ^ { \\otimes q } \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 356, + 273, + 371 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17.5 + }, + { + "type": "interline_equation", + "bbox": [ + 154, + 371, + 456, + 395 + ], + "lines": [ + { + "bbox": [ + 154, + 371, + 456, + 395 + ], + "spans": [ + { + "bbox": [ + 154, + 371, + 456, + 395 + ], + "score": 0.93, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\Big ( \\mathbb { E } \\big [ \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } ( - x ) ^ { \\otimes q } \\big ] + \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] \\Big ) .", + "type": "interline_equation", + "image_path": "7d8ac8d53eec1235c46da035ef9f5f729fe20f9b2423850be81c7ea7c507a7c6.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 154, + 371, + 456, + 395 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 395, + 449, + 407 + ], + "lines": [ + { + "bbox": [ + 106, + 395, + 450, + 407 + ], + "spans": [ + { + "bbox": [ + 106, + 395, + 237, + 407 + ], + "score": 1.0, + "content": "There are two cases to consider:", + "type": "text" + }, + { + "bbox": [ + 237, + 398, + 244, + 407 + ], + "score": 0.83, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 395, + 262, + 407 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 262, + 398, + 268, + 407 + ], + "score": 0.82, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 395, + 450, + 407 + ], + "score": 1.0, + "content": "are both even numbers or both odd numbers.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 130, + 418, + 361, + 430 + ], + "lines": [ + { + "bbox": [ + 130, + 418, + 361, + 431 + ], + "spans": [ + { + "bbox": [ + 130, + 418, + 219, + 431 + ], + "score": 1.0, + "content": "1. For the case where", + "type": "text" + }, + { + "bbox": [ + 220, + 421, + 226, + 430 + ], + "score": 0.81, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 418, + 244, + 431 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 244, + 421, + 250, + 430 + ], + "score": 0.82, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 418, + 361, + 431 + ], + "score": 1.0, + "content": "are even numbers, we have", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "interline_equation", + "bbox": [ + 213, + 431, + 430, + 501 + ], + "lines": [ + { + "bbox": [ + 213, + 431, + 430, + 501 + ], + "spans": [ + { + "bbox": [ + 213, + 431, + 430, + 501 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\quad \\frac { 1 } { 2 } \\bigl ( \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } ( - x ) ^ { \\otimes q } \\bigr ] + \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] \\bigr ) } \\\\ & { = \\frac { 1 } { 2 } \\bigl ( \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] + \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] \\bigr ) } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\Bigl [ \\Bigl ( \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } + \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } \\Bigr ) x ^ { \\otimes q } \\Bigr ] . } \\end{array}", + "type": "interline_equation", + "image_path": "afbc2dce8bc742eb89f691be27bff6a2c29e7056e8b0e80bd958e73a865a1b7c.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 213, + 431, + 430, + 445.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 213, + 445.0, + 430, + 459.0 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 213, + 459.0, + 430, + 473.0 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 213, + 473.0, + 430, + 487.0 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 213, + 487.0, + 430, + 501.0 + ], + "spans": [], + "index": 26 + } + ] + }, + { + "type": "text", + "bbox": [ + 142, + 502, + 505, + 530 + ], + "lines": [ + { + "bbox": [ + 140, + 500, + 506, + 519 + ], + "spans": [ + { + "bbox": [ + 140, + 500, + 152, + 519 + ], + "score": 1.0, + "content": "If", + "type": "text" + }, + { + "bbox": [ + 152, + 503, + 196, + 516 + ], + "score": 0.92, + "content": "( a ^ { \\top } x ) \\leq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 197, + 500, + 233, + 519 + ], + "score": 1.0, + "content": ", we kno", + "type": "text" + }, + { + "bbox": [ + 234, + 503, + 457, + 517 + ], + "score": 0.61, + "content": "\\operatorname { v } \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = ( a ^ { \\top } x ) ^ { p } + 0 = ( a ^ { \\top } x ) ^ { p } .", + "type": "inline_equation" + }, + { + "bbox": [ + 457, + 500, + 506, + 519 + ], + "score": 1.0, + "content": "Otherwise,", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 142, + 515, + 423, + 531 + ], + "spans": [ + { + "bbox": [ + 142, + 515, + 178, + 531 + ], + "score": 1.0, + "content": "we have", + "type": "text" + }, + { + "bbox": [ + 178, + 516, + 394, + 531 + ], + "score": 0.89, + "content": "\\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = 0 + ( a ^ { \\top } x ) ^ { p } = ( a ^ { \\top } x ) ^ { p } .", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 515, + 423, + 531 + ], + "score": 1.0, + "content": ". Thus,", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 27.5 + }, + { + "type": "interline_equation", + "bbox": [ + 195, + 532, + 451, + 580 + ], + "lines": [ + { + "bbox": [ + 195, + 532, + 451, + 580 + ], + "spans": [ + { + "bbox": [ + 195, + 532, + 451, + 580 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\Big [ \\Big ( \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } + \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } \\Big ) x ^ { \\otimes q } \\Big ] } \\\\ & { \\qquad = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] . } \\end{array}", + "type": "interline_equation", + "image_path": "ca255c49ec78741681812723872cec2fa83d46f7b8d09d339c60e472dcb4e38c.jpg" + } + ] + } + ], + "index": 30, + "virtual_lines": [ + { + "bbox": [ + 195, + 532, + 451, + 548.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 195, + 548.0, + 451, + 564.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 195, + 564.0, + 451, + 580.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 130, + 585, + 380, + 596 + ], + "lines": [ + { + "bbox": [ + 128, + 583, + 381, + 598 + ], + "spans": [ + { + "bbox": [ + 128, + 583, + 242, + 598 + ], + "score": 1.0, + "content": "2. For the other case where", + "type": "text" + }, + { + "bbox": [ + 243, + 587, + 249, + 596 + ], + "score": 0.8, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 583, + 267, + 598 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 267, + 587, + 273, + 596 + ], + "score": 0.81, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 583, + 381, + 598 + ], + "score": 1.0, + "content": "are odd numbers, we have", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 32 + }, + { + "type": "interline_equation", + "bbox": [ + 214, + 598, + 431, + 645 + ], + "lines": [ + { + "bbox": [ + 214, + 598, + 431, + 645 + ], + "spans": [ + { + "bbox": [ + 214, + 598, + 431, + 645 + ], + "score": 0.89, + "content": "\\begin{array} { r l } & { \\quad \\frac { 1 } { 2 } \\bigl ( \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } ( - x ) ^ { \\otimes q } \\bigr ] + \\mathbb { E } \\bigl [ \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } x ^ { \\otimes q } \\bigr ] \\bigr ) } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\Bigl [ \\Bigl ( - \\bigl ( \\sigma ( - a ^ { \\top } x ) \\bigr ) ^ { p } + \\bigl ( \\sigma ( a ^ { \\top } x ) \\bigr ) ^ { p } \\Bigr ) x ^ { \\otimes q } \\Bigr ] . } \\end{array}", + "type": "interline_equation", + "image_path": "924b20cebd3789557f427c205951c2b05e05ddf0e1609ecf94360dc099403c98.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 214, + 598, + 431, + 613.6666666666666 + ], + "spans": [], + "index": 33 + }, + { + "bbox": [ + 214, + 613.6666666666666, + 431, + 629.3333333333333 + ], + "spans": [], + "index": 34 + }, + { + "bbox": [ + 214, + 629.3333333333333, + 431, + 644.9999999999999 + ], + "spans": [], + "index": 35 + } + ] + }, + { + "type": "text", + "bbox": [ + 143, + 646, + 504, + 682 + ], + "lines": [ + { + "bbox": [ + 141, + 644, + 504, + 660 + ], + "spans": [ + { + "bbox": [ + 141, + 644, + 195, + 660 + ], + "score": 1.0, + "content": "Similarly, if", + "type": "text" + }, + { + "bbox": [ + 195, + 646, + 244, + 659 + ], + "score": 0.92, + "content": "( a ^ { \\top } x ) \\leq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 644, + 286, + 660 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 286, + 646, + 504, + 659 + ], + "score": 0.79, + "content": "- \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = - ( - a ^ { \\top } x ) ^ { p } + 0 =", + "type": "inline_equation" + } + ], + "index": 36 + }, + { + "bbox": [ + 143, + 658, + 504, + 675 + ], + "spans": [ + { + "bbox": [ + 143, + 659, + 173, + 672 + ], + "score": 0.92, + "content": "( a ^ { \\top } x ) ^ { p }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 658, + 267, + 675 + ], + "score": 1.0, + "content": ". Otherwise, we have", + "type": "text" + }, + { + "bbox": [ + 267, + 660, + 504, + 674 + ], + "score": 0.86, + "content": "- \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = 0 + ( a ^ { \\top } x ) ^ { p } = ( a ^ { \\top } x ) ^ { p } .", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 140, + 669, + 170, + 685 + ], + "spans": [ + { + "bbox": [ + 140, + 669, + 170, + 685 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37 + }, + { + "type": "interline_equation", + "bbox": [ + 189, + 683, + 456, + 732 + ], + "lines": [ + { + "bbox": [ + 189, + 683, + 456, + 732 + ], + "spans": [ + { + "bbox": [ + 189, + 683, + 456, + 732 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\Big [ \\Big ( - \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } + \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } \\Big ) x ^ { \\otimes q } \\Big ] } \\\\ & { \\qquad = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] . } \\end{array}", + "type": "interline_equation", + "image_path": "c84d12113ef89d8cc1becc5c696e78c14dba83b2ad3e557b72e251148d3ca846.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 189, + 683, + 456, + 699.3333333333334 + ], + "spans": [], + "index": 39 + }, + { + "bbox": [ + 189, + 699.3333333333334, + 456, + 715.6666666666667 + ], + "spans": [], + "index": 40 + }, + { + "bbox": [ + 189, + 715.6666666666667, + 456, + 732.0000000000001 + ], + "spans": [], + "index": 41 + } + ] + } + ], + "page_idx": 13, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "score": 1.0, + "content": "14", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 81, + 284, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 80, + 286, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 80, + 286, + 96 + ], + "score": 1.0, + "content": "A DETAILS OF EXACT ANALYSIS", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 107, + 105, + 505, + 150 + ], + "lines": [ + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "score": 1.0, + "content": "In this section, we first provide the missing proofs for the lemmas appeared in Section 3. Then we", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 115, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 277, + 129 + ], + "score": 1.0, + "content": "discuss how to handle the noise case (i.e.", + "type": "text" + }, + { + "bbox": [ + 277, + 116, + 350, + 128 + ], + "score": 0.93, + "content": "\\overset { \\cdot } { \\boldsymbol { y } } = \\sigma ( W \\boldsymbol { x } ) + \\boldsymbol { \\xi } )", + "type": "inline_equation" + }, + { + "bbox": [ + 350, + 115, + 505, + 129 + ], + "score": 1.0, + "content": "and give the corresponding algorithm", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 127, + 505, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 478, + 140 + ], + "score": 1.0, + "content": "(Algorithm 3). At the end we also briefly discuss how to handle the case when the matrix", + "type": "text" + }, + { + "bbox": [ + 479, + 128, + 487, + 137 + ], + "score": 0.69, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 127, + 505, + 140 + ], + "score": 1.0, + "content": "has", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 138, + 342, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 342, + 150 + ], + "score": 1.0, + "content": "more rows than columns (more outputs than hidden units).", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2.5, + "bbox_fs": [ + 105, + 105, + 505, + 150 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 154, + 504, + 178 + ], + "lines": [ + { + "bbox": [ + 105, + 154, + 506, + 168 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 291, + 168 + ], + "score": 1.0, + "content": "Again, throughout the section when we write", + "type": "text" + }, + { + "bbox": [ + 291, + 155, + 307, + 167 + ], + "score": 0.86, + "content": "\\mathbb { E } [ \\cdot ]", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 154, + 506, + 168 + ], + "score": 1.0, + "content": ", the expectation is taken over the randomness of", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 107, + 164, + 186, + 179 + ], + "spans": [ + { + "bbox": [ + 107, + 167, + 135, + 176 + ], + "score": 0.89, + "content": "x \\sim \\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 164, + 176, + 179 + ], + "score": 1.0, + "content": "and noise", + "type": "text" + }, + { + "bbox": [ + 176, + 166, + 182, + 178 + ], + "score": 0.81, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 164, + 186, + 179 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5.5, + "bbox_fs": [ + 105, + 154, + 506, + 179 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 190, + 276, + 201 + ], + "lines": [ + { + "bbox": [ + 106, + 190, + 277, + 203 + ], + "spans": [ + { + "bbox": [ + 106, + 190, + 277, + 203 + ], + "score": 1.0, + "content": "A.1 MISSING PROOFS FOR SECTION 3", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7 + }, + { + "type": "text", + "bbox": [ + 106, + 215, + 505, + 271 + ], + "lines": [ + { + "bbox": [ + 106, + 216, + 505, + 228 + ], + "spans": [ + { + "bbox": [ + 106, + 216, + 505, + 228 + ], + "score": 1.0, + "content": "Single-layer: To get rid of the non-linearities like ReLU, we use the property of the symmetric", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 226, + 505, + 239 + ], + "spans": [ + { + "bbox": [ + 106, + 226, + 505, + 239 + ], + "score": 1.0, + "content": "distribution (similar to (Goel et al., 2018)). Here we provide a more general version (Lemma 6)", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 237, + 506, + 250 + ], + "spans": [ + { + "bbox": [ + 105, + 237, + 457, + 250 + ], + "score": 1.0, + "content": "instead of proving the specific Lemma 1. Note that Lemma 1 is the special case when", + "type": "text" + }, + { + "bbox": [ + 458, + 239, + 487, + 248 + ], + "score": 0.88, + "content": "a = w", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 237, + 506, + 250 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 247, + 506, + 262 + ], + "spans": [ + { + "bbox": [ + 107, + 249, + 151, + 260 + ], + "score": 0.87, + "content": "p = q = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 247, + 176, + 262 + ], + "score": 1.0, + "content": "(here", + "type": "text" + }, + { + "bbox": [ + 176, + 249, + 182, + 260 + ], + "score": 0.78, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 247, + 475, + 262 + ], + "score": 1.0, + "content": "does not affect the result since it has zero mean and is independent with", + "type": "text" + }, + { + "bbox": [ + 475, + 251, + 482, + 259 + ], + "score": 0.78, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 247, + 506, + 262 + ], + "score": 1.0, + "content": ", thus", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 259, + 202, + 273 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 198, + 272 + ], + "score": 0.89, + "content": "\\mathbb { \\tilde { E } } [ y x ] = \\mathbb { E } [ \\sigma ( w ^ { \\top } x ) x ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 259, + 202, + 273 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 10, + "bbox_fs": [ + 105, + 216, + 506, + 273 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 273, + 504, + 295 + ], + "lines": [ + { + "bbox": [ + 105, + 272, + 505, + 286 + ], + "spans": [ + { + "bbox": [ + 105, + 272, + 214, + 286 + ], + "score": 1.0, + "content": "Lemma 6. Suppose input", + "type": "text" + }, + { + "bbox": [ + 215, + 276, + 221, + 283 + ], + "score": 0.49, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 222, + 272, + 436, + 286 + ], + "score": 1.0, + "content": "comes from a symmetric distribution, for any vector", + "type": "text" + }, + { + "bbox": [ + 436, + 272, + 469, + 283 + ], + "score": 0.92, + "content": "a \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 469, + 272, + 505, + 286 + ], + "score": 1.0, + "content": "and any", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 284, + 421, + 296 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 194, + 296 + ], + "score": 1.0, + "content": "non-negative integers", + "type": "text" + }, + { + "bbox": [ + 195, + 286, + 201, + 295 + ], + "score": 0.34, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 284, + 219, + 296 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 219, + 286, + 226, + 295 + ], + "score": 0.67, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 284, + 285, + 296 + ], + "score": 1.0, + "content": "satisfying that", + "type": "text" + }, + { + "bbox": [ + 285, + 285, + 309, + 295 + ], + "score": 0.89, + "content": "p + q", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 284, + 421, + 296 + ], + "score": 1.0, + "content": "is an even number, we have", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 13.5, + "bbox_fs": [ + 105, + 272, + 505, + 296 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 296, + 385, + 319 + ], + "lines": [ + { + "bbox": [ + 225, + 296, + 385, + 319 + ], + "spans": [ + { + "bbox": [ + 225, + 296, + 385, + 319 + ], + "score": 0.93, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] ,", + "type": "interline_equation", + "image_path": "752c6267837d1d801e50adf0e29663e9647bb1e4fa5a22cc59e514227b88b5db.jpg" + } + ] + } + ], + "index": 15, + "virtual_lines": [ + { + "bbox": [ + 225, + 296, + 385, + 319 + ], + "spans": [], + "index": 15 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 320, + 335, + 331 + ], + "lines": [ + { + "bbox": [ + 106, + 319, + 336, + 333 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 336, + 333 + ], + "score": 1.0, + "content": "where the expectation is taken over the input distribution.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 16, + "bbox_fs": [ + 106, + 319, + 336, + 333 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 343, + 505, + 370 + ], + "lines": [ + { + "bbox": [ + 104, + 342, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 104, + 342, + 186, + 358 + ], + "score": 1.0, + "content": "Proof. Since input", + "type": "text" + }, + { + "bbox": [ + 186, + 347, + 193, + 354 + ], + "score": 0.74, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 342, + 413, + 358 + ], + "score": 1.0, + "content": "comes from a symmetric distribution, we know that", + "type": "text" + }, + { + "bbox": [ + 414, + 343, + 505, + 358 + ], + "score": 0.9, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] \\ =", + "type": "inline_equation" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 356, + 273, + 371 + ], + "spans": [ + { + "bbox": [ + 106, + 356, + 208, + 371 + ], + "score": 0.91, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } ( - x ) ^ { \\otimes q } \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 356, + 273, + 371 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17.5, + "bbox_fs": [ + 104, + 342, + 505, + 371 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 154, + 371, + 456, + 395 + ], + "lines": [ + { + "bbox": [ + 154, + 371, + 456, + 395 + ], + "spans": [ + { + "bbox": [ + 154, + 371, + 456, + 395 + ], + "score": 0.93, + "content": "\\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\Big ( \\mathbb { E } \\big [ \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } ( - x ) ^ { \\otimes q } \\big ] + \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] \\Big ) .", + "type": "interline_equation", + "image_path": "7d8ac8d53eec1235c46da035ef9f5f729fe20f9b2423850be81c7ea7c507a7c6.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 154, + 371, + 456, + 395 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 395, + 449, + 407 + ], + "lines": [ + { + "bbox": [ + 106, + 395, + 450, + 407 + ], + "spans": [ + { + "bbox": [ + 106, + 395, + 237, + 407 + ], + "score": 1.0, + "content": "There are two cases to consider:", + "type": "text" + }, + { + "bbox": [ + 237, + 398, + 244, + 407 + ], + "score": 0.83, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 395, + 262, + 407 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 262, + 398, + 268, + 407 + ], + "score": 0.82, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 395, + 450, + 407 + ], + "score": 1.0, + "content": "are both even numbers or both odd numbers.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20, + "bbox_fs": [ + 106, + 395, + 450, + 407 + ] + }, + { + "type": "text", + "bbox": [ + 130, + 418, + 361, + 430 + ], + "lines": [ + { + "bbox": [ + 130, + 418, + 361, + 431 + ], + "spans": [ + { + "bbox": [ + 130, + 418, + 219, + 431 + ], + "score": 1.0, + "content": "1. 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Thus,", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 27.5, + "bbox_fs": [ + 140, + 500, + 506, + 531 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 195, + 532, + 451, + 580 + ], + "lines": [ + { + "bbox": [ + 195, + 532, + 451, + 580 + ], + "spans": [ + { + "bbox": [ + 195, + 532, + 451, + 580 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\Big [ \\Big ( \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } + \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } \\Big ) x ^ { \\otimes q } \\Big ] } \\\\ & { \\qquad = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] . } \\end{array}", + "type": "interline_equation", + "image_path": "ca255c49ec78741681812723872cec2fa83d46f7b8d09d339c60e472dcb4e38c.jpg" + } + ] + } + ], + "index": 30, + "virtual_lines": [ + { + "bbox": [ + 195, + 532, + 451, + 548.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 195, + 548.0, + 451, + 564.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 195, + 564.0, + 451, + 580.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 130, + 585, + 380, + 596 + ], + "lines": [ + { + "bbox": [ + 128, + 583, + 381, + 598 + ], + "spans": [ + { + "bbox": [ + 128, + 583, + 242, + 598 + ], + "score": 1.0, + "content": "2. 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Otherwise, we have", + "type": "text" + }, + { + "bbox": [ + 267, + 660, + 504, + 674 + ], + "score": 0.86, + "content": "- \\left( \\sigma ( - a ^ { \\top } x ) \\right) ^ { p } + \\left( \\sigma ( a ^ { \\top } x ) \\right) ^ { p } = 0 + ( a ^ { \\top } x ) ^ { p } = ( a ^ { \\top } x ) ^ { p } .", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 140, + 669, + 170, + 685 + ], + "spans": [ + { + "bbox": [ + 140, + 669, + 170, + 685 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37, + "bbox_fs": [ + 140, + 644, + 504, + 685 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 189, + 683, + 456, + 732 + ], + "lines": [ + { + "bbox": [ + 189, + 683, + 456, + 732 + ], + "spans": [ + { + "bbox": [ + 189, + 683, + 456, + 732 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } x ^ { \\otimes q } \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\Big [ \\Big ( - \\big ( \\sigma ( - a ^ { \\top } x ) \\big ) ^ { p } + \\big ( \\sigma ( a ^ { \\top } x ) \\big ) ^ { p } \\Big ) x ^ { \\otimes q } \\Big ] } \\\\ & { \\qquad = \\frac { 1 } { 2 } \\mathbb { E } [ ( a ^ { \\top } x ) ^ { p } x ^ { \\otimes q } ] . } \\end{array}", + "type": "interline_equation", + "image_path": "c84d12113ef89d8cc1becc5c696e78c14dba83b2ad3e557b72e251148d3ca846.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 189, + 683, + 456, + 699.3333333333334 + ], + "spans": [], + "index": 39 + }, + { + "bbox": [ + 189, + 699.3333333333334, + 456, + 715.6666666666667 + ], + "spans": [], + "index": 40 + }, + { + "bbox": [ + 189, + 715.6666666666667, + 456, + 732.0000000000001 + ], + "spans": [], + "index": 41 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 104, + 110, + 504, + 134 + ], + "lines": [ + { + "bbox": [ + 106, + 111, + 505, + 123 + ], + "spans": [ + { + "bbox": [ + 106, + 111, + 505, + 123 + ], + "score": 1.0, + "content": "Pure neuron detector: The first step in our algorithm is to construct a pure neuron detector based", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 122, + 424, + 133 + ], + "spans": [ + { + "bbox": [ + 106, + 122, + 424, + 133 + ], + "score": 1.0, + "content": "on Lemma 2 and Lemma 3. We will provide proofs for these two lemmas here.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 106, + 140, + 506, + 177 + ], + "lines": [ + { + "bbox": [ + 105, + 139, + 506, + 154 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 391, + 154 + ], + "score": 1.0, + "content": "Proof of Lemma 2. This proof easily follows from Lemma 6. Setting", + "type": "text" + }, + { + "bbox": [ + 392, + 143, + 420, + 151 + ], + "score": 0.81, + "content": "a = w", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 139, + 423, + 154 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 424, + 142, + 450, + 151 + ], + "score": 0.82, + "content": "p = 2", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 139, + 468, + 154 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 468, + 141, + 493, + 152 + ], + "score": 0.88, + "content": "q = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 139, + 506, + 154 + ], + "score": 1.0, + "content": "in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 151, + 506, + 165 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 186, + 165 + ], + "score": 1.0, + "content": "Lemma 6, we have", + "type": "text" + }, + { + "bbox": [ + 187, + 151, + 283, + 164 + ], + "score": 0.94, + "content": "\\mathbb { E } [ \\hat { y } ^ { 2 } ] \\stackrel { \\cdot } { = } \\frac { 1 } { 2 } w ^ { \\top } \\mathbb { E } [ \\stackrel { \\cdot } { x } x ^ { \\top } ] w", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 151, + 389, + 165 + ], + "score": 1.0, + "content": ". Similarly, we also know", + "type": "text" + }, + { + "bbox": [ + 389, + 152, + 486, + 165 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathbb E [ \\hat { y } x ^ { \\top } ] = \\frac 1 2 w ^ { \\top } \\mathbb E [ x x ^ { \\top } ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 151, + 506, + 165 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 163, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 163, + 189, + 178 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\mathbb { E } [ \\hat { y } x ] = \\frac { 1 } { 2 } \\mathbb { E } [ x x ^ { \\top } ] w } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 163, + 252, + 178 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + }, + { + "bbox": [ + 253, + 164, + 388, + 177 + ], + "score": 0.93, + "content": "\\mathbb { E } [ \\hat { y } ^ { 2 } ] = 2 \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { y } x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 163, + 392, + 178 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 494, + 164, + 506, + 176 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3 + }, + { + "type": "text", + "bbox": [ + 105, + 183, + 505, + 235 + ], + "lines": [ + { + "bbox": [ + 105, + 183, + 506, + 197 + ], + "spans": [ + { + "bbox": [ + 105, + 183, + 506, + 197 + ], + "score": 1.0, + "content": "Proof of Lemma 3. Here, we only prove the second equation, since the first equation is just a", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 195, + 506, + 212 + ], + "spans": [ + { + "bbox": [ + 104, + 195, + 334, + 212 + ], + "score": 1.0, + "content": "special case of the second equation. First, we rewrite", + "type": "text" + }, + { + "bbox": [ + 334, + 195, + 461, + 209 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) = u ^ { \\top } y } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 195, + 506, + 212 + ], + "score": 1.0, + "content": "by letting", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 207, + 504, + 222 + ], + "spans": [ + { + "bbox": [ + 106, + 208, + 154, + 220 + ], + "score": 0.9, + "content": "u ^ { \\top } A = c ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 155, + 207, + 461, + 222 + ], + "score": 1.0, + "content": ". Then we transform these two terms in the LHS as follows. Let’s look at", + "type": "text" + }, + { + "bbox": [ + 461, + 208, + 504, + 222 + ], + "score": 0.91, + "content": "\\mathbb { E } [ ( u ^ { \\top } y ) \\cdot", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 221, + 426, + 235 + ], + "spans": [ + { + "bbox": [ + 106, + 221, + 254, + 235 + ], + "score": 0.9, + "content": "( \\mathbb { E } [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } ^ { \\top } ] \\mathbb { E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } \\boldsymbol { x } ) \\cdot ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 221, + 293, + 235 + ], + "score": 1.0, + "content": "first. For", + "type": "text" + }, + { + "bbox": [ + 293, + 221, + 385, + 234 + ], + "score": 0.91, + "content": "\\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 221, + 426, + 235 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6.5 + }, + { + "type": "interline_equation", + "bbox": [ + 234, + 235, + 375, + 321 + ], + "lines": [ + { + "bbox": [ + 234, + 235, + 375, + 321 + ], + "spans": [ + { + "bbox": [ + 234, + 235, + 375, + 321 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\frac { 1 } { 2 } u ^ { \\top } A W \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\frac { 1 } { 2 } u ^ { \\top } A W } \\end{array}", + "type": "interline_equation", + "image_path": "70c694d3de19bce55ee05c7fdd331870a14229b057702f06e677bd0100af1013.jpg" + } + ] + } + ], + "index": 9.5, + "virtual_lines": [ + { + "bbox": [ + 234, + 235, + 375, + 278.0 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 234, + 278.0, + 375, + 321.0 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 325, + 395, + 339 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 395, + 341 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 167, + 341 + ], + "score": 1.0, + "content": "For any vector", + "type": "text" + }, + { + "bbox": [ + 167, + 326, + 196, + 338 + ], + "score": 0.92, + "content": "q \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 197, + 324, + 236, + 341 + ], + "score": 1.0, + "content": ", consider", + "type": "text" + }, + { + "bbox": [ + 236, + 325, + 353, + 339 + ], + "score": 0.89, + "content": "2 \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\cdot ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) \\cdot ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 324, + 395, + 341 + ], + "score": 1.0, + "content": ". We have", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "interline_equation", + "bbox": [ + 240, + 340, + 360, + 355 + ], + "lines": [], + "index": 12, + "virtual_lines": [ + { + "bbox": [ + 240, + 340, + 360, + 355 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "interline_equation", + "bbox": [ + 232, + 352, + 376, + 389 + ], + "lines": [ + { + "bbox": [ + 232, + 352, + 376, + 389 + ], + "spans": [ + { + "bbox": [ + 232, + 352, + 376, + 389 + ], + "score": 0.41, + "content": "\\begin{array} { r l } & { \\mathrm { ~ \\gamma ~ } } \\\\ & { \\mathrm { ~ \\ } } \\\\ & { \\mathrm { = 2 \\mathbb E } [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } \\boldsymbol { \\sigma } ( \\boldsymbol { W } \\boldsymbol { x } ) ) ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) ] } \\\\ & { \\mathrm { ~ \\ } } \\\\ & { \\mathrm { = \\mathbb E } \\left[ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } \\boldsymbol { W } \\boldsymbol { x } ) ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\right] } \\end{array}", + "type": "interline_equation", + "image_path": "272c1b5f402744448091ab5bcfb04b6537410159635aa834f4f83ae6e5deac34.jpg" + } + ] + } + ], + "index": 13.5, + "virtual_lines": [ + { + "bbox": [ + 232, + 352, + 376, + 370.5 + ], + "spans": [], + "index": 13 + }, + { + "bbox": [ + 232, + 370.5, + 376, + 389.0 + ], + "spans": [], + "index": 14 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 395, + 334, + 411 + ], + "lines": [ + { + "bbox": [ + 104, + 394, + 336, + 412 + ], + "spans": [ + { + "bbox": [ + 104, + 394, + 122, + 412 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 395, + 295, + 411 + ], + "score": 0.93, + "content": "\\begin{array} { r } { { \\boldsymbol { q } } ^ { \\top } = \\mathbb { E } \\big [ ( { \\boldsymbol { u } } ^ { \\top } { \\boldsymbol { y } } ) { \\boldsymbol { x } } ^ { \\top } \\big ] \\mathbb { E } \\big [ { \\boldsymbol { x } } { \\boldsymbol { x } } ^ { \\top } \\big ] ^ { - 1 } = \\textstyle { \\frac { 1 } { 2 } } { \\boldsymbol { u } } ^ { \\top } { \\boldsymbol { A } } { \\boldsymbol { W } } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 394, + 336, + 412 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 15 + }, + { + "type": "interline_equation", + "bbox": [ + 113, + 414, + 495, + 540 + ], + "lines": [ + { + "bbox": [ + 113, + 414, + 495, + 540 + ], + "spans": [ + { + "bbox": [ + 113, + 414, + 495, + 540 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\quad 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\big [ 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look at the second term", + "type": "text" + }, + { + "bbox": [ + 245, + 566, + 321, + 581 + ], + "score": 0.91, + "content": "\\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 564, + 326, + 582 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "interline_equation", + "bbox": [ + 103, + 586, + 500, + 721 + ], + "lines": [ + { + "bbox": [ + 103, + 586, + 500, + 721 + ], + "spans": [ + { + "bbox": [ + 103, + 586, + 500, + 721 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { ~ \\mathbb { E } [ ( u ^ { \\prime } , y ) ^ { 2 } ( x \\otimes x ) ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ \\langle A ^ { \\top } u , \\sigma ( W x ) \\rangle ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k 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We will provide proofs for these two lemmas here.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 106, + 111, + 505, + 133 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 140, + 506, + 177 + ], + "lines": [ + { + "bbox": [ + 105, + 139, + 506, + 154 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 391, + 154 + ], + "score": 1.0, + "content": "Proof of Lemma 2. This proof easily follows from Lemma 6. Setting", + "type": "text" + }, + { + "bbox": [ + 392, + 143, + 420, + 151 + ], + "score": 0.81, + "content": "a = w", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 139, + 423, + 154 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 424, + 142, + 450, + 151 + ], + "score": 0.82, + "content": "p = 2", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 139, + 468, + 154 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 468, + 141, + 493, + 152 + ], + "score": 0.88, + "content": "q = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 139, + 506, + 154 + ], + "score": 1.0, + "content": "in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 151, + 506, + 165 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 186, + 165 + ], + "score": 1.0, + "content": "Lemma 6, we have", + "type": "text" + }, + { + "bbox": [ + 187, + 151, + 283, + 164 + ], + "score": 0.94, + "content": "\\mathbb { E } [ \\hat { y } ^ { 2 } ] \\stackrel { \\cdot } { = } \\frac { 1 } { 2 } w ^ { \\top } \\mathbb { E } [ \\stackrel { \\cdot } { x } x ^ { \\top } ] w", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 151, + 389, + 165 + ], + "score": 1.0, + "content": ". 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Thus, we have", + "type": "text" + }, + { + "bbox": [ + 253, + 164, + 388, + 177 + ], + "score": 0.93, + "content": "\\mathbb { E } [ \\hat { y } ^ { 2 } ] = 2 \\mathbb { E } [ \\hat { y } x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { y } x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 163, + 392, + 178 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 494, + 164, + 506, + 176 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3, + "bbox_fs": [ + 105, + 139, + 506, + 178 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 183, + 505, + 235 + ], + "lines": [ + { + "bbox": [ + 105, + 183, + 506, + 197 + ], + "spans": [ + { + "bbox": [ + 105, + 183, + 506, + 197 + ], + "score": 1.0, + "content": "Proof of Lemma 3. Here, we only prove the second equation, since the first equation is just a", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 195, + 506, + 212 + ], + "spans": [ + { + "bbox": [ + 104, + 195, + 334, + 212 + ], + "score": 1.0, + "content": "special case of the second equation. First, we rewrite", + "type": "text" + }, + { + "bbox": [ + 334, + 195, + 461, + 209 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\hat { y } = \\sum _ { i = 1 } ^ { k } c _ { i } \\sigma ( w _ { i } ^ { \\top } x ) = u ^ { \\top } y } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 195, + 506, + 212 + ], + "score": 1.0, + "content": "by letting", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 207, + 504, + 222 + ], + "spans": [ + { + "bbox": [ + 106, + 208, + 154, + 220 + ], + "score": 0.9, + "content": "u ^ { \\top } A = c ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 155, + 207, + 461, + 222 + ], + "score": 1.0, + "content": ". Then we transform these two terms in the LHS as follows. Let’s look at", + "type": "text" + }, + { + "bbox": [ + 461, + 208, + 504, + 222 + ], + "score": 0.91, + "content": "\\mathbb { E } [ ( u ^ { \\top } y ) \\cdot", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 221, + 426, + 235 + ], + "spans": [ + { + "bbox": [ + 106, + 221, + 254, + 235 + ], + "score": 0.9, + "content": "( \\mathbb { E } [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\boldsymbol { x } ^ { \\top } ] \\mathbb { E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } \\boldsymbol { x } ) \\cdot ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 221, + 293, + 235 + ], + "score": 1.0, + "content": "first. For", + "type": "text" + }, + { + "bbox": [ + 293, + 221, + 385, + 234 + ], + "score": 0.91, + "content": "\\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 221, + 426, + 235 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6.5, + "bbox_fs": [ + 104, + 183, + 506, + 235 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 234, + 235, + 375, + 321 + ], + "lines": [ + { + "bbox": [ + 234, + 235, + 375, + 321 + ], + "spans": [ + { + "bbox": [ + 234, + 235, + 375, + 321 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\frac { 1 } { 2 } u ^ { \\top } A W \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } } \\\\ & { = \\frac { 1 } { 2 } u ^ { \\top } A W } \\end{array}", + "type": "interline_equation", + "image_path": "70c694d3de19bce55ee05c7fdd331870a14229b057702f06e677bd0100af1013.jpg" + } + ] + } + ], + "index": 9.5, + "virtual_lines": [ + { + "bbox": [ + 234, + 235, + 375, + 278.0 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 234, + 278.0, + 375, + 321.0 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 325, + 395, + 339 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 395, + 341 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 167, + 341 + ], + "score": 1.0, + "content": "For any vector", + "type": "text" + }, + { + "bbox": [ + 167, + 326, + 196, + 338 + ], + "score": 0.92, + "content": "q \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 197, + 324, + 236, + 341 + ], + "score": 1.0, + "content": ", consider", + "type": "text" + }, + { + "bbox": [ + 236, + 325, + 353, + 339 + ], + "score": 0.89, + "content": "2 \\mathbb { E } \\big [ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { y } ) \\cdot ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) \\cdot ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 324, + 395, + 341 + ], + "score": 1.0, + "content": ". 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\\left[ ( \\boldsymbol { u } ^ { \\top } \\boldsymbol { A } \\boldsymbol { W } \\boldsymbol { x } ) ( \\boldsymbol { q } ^ { \\top } \\boldsymbol { x } ) ( \\boldsymbol { x } \\otimes \\boldsymbol { x } ) \\right] } \\end{array}", + "type": "interline_equation", + "image_path": "272c1b5f402744448091ab5bcfb04b6537410159635aa834f4f83ae6e5deac34.jpg" + } + ] + } + ], + "index": 13.5, + "virtual_lines": [ + { + "bbox": [ + 232, + 352, + 376, + 370.5 + ], + "spans": [], + "index": 13 + }, + { + "bbox": [ + 232, + 370.5, + 376, + 389.0 + ], + "spans": [], + "index": 14 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 395, + 334, + 411 + ], + "lines": [ + { + "bbox": [ + 104, + 394, + 336, + 412 + ], + "spans": [ + { + "bbox": [ + 104, + 394, + 122, + 412 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 395, + 295, + 411 + ], + "score": 0.93, + "content": "\\begin{array} { r } { { \\boldsymbol { q } } ^ { \\top } = \\mathbb { E } \\big [ ( { \\boldsymbol { u } } ^ { \\top } { \\boldsymbol { y } } ) { \\boldsymbol { x } } ^ { \\top } \\big ] \\mathbb { E } \\big [ { \\boldsymbol { x } } { \\boldsymbol { x } } ^ { \\top } \\big ] ^ { - 1 } = \\textstyle { \\frac { 1 } { 2 } } { \\boldsymbol { u } } ^ { \\top } { \\boldsymbol { A } } { \\boldsymbol { W } } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 394, + 336, + 412 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 15, + "bbox_fs": [ + 104, + 394, + 336, + 412 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 113, + 414, + 495, + 540 + ], + "lines": [ + { + "bbox": [ + 113, + 414, + 495, + 540 + ], + "spans": [ + { + "bbox": [ + 113, + 414, + 495, + 540 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\quad 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( u ^ { \\top } A W x ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = - \\frac { 1 } { 2 } \\mathbb { E } \\big [ \\langle A ^ { \\top } u , W x \\rangle ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u ) _ { i } ^ { 2 } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ) _ { i } ( A ^ { \\top } u ) _ { j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "bb885ab71860080ee69bb26ecf3cbf908f1eb4d199b2990c3d6d9dc8bb6fbee9.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 113, + 414, + 495, + 456.0 + ], + "spans": [], + "index": 16 + }, + { + "bbox": [ + 113, + 456.0, + 495, + 498.0 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 113, + 498.0, + 495, + 540.0 + ], + "spans": [], + "index": 18 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 550, + 306, + 562 + ], + "lines": [ + { + "bbox": [ + 106, + 550, + 306, + 563 + ], + "spans": [ + { + "bbox": [ + 106, + 550, + 306, + 563 + ], + "score": 1.0, + "content": "where the second equality holds due to Lemma 6.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19, + "bbox_fs": [ + 106, + 550, + 306, + 563 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 566, + 325, + 580 + ], + "lines": [ + { + "bbox": [ + 104, + 564, + 326, + 582 + ], + "spans": [ + { + "bbox": [ + 104, + 564, + 244, + 582 + ], + "score": 1.0, + "content": "Now, let’s look at the second term", + "type": "text" + }, + { + "bbox": [ + 245, + 566, + 321, + 581 + ], + "score": 0.91, + "content": "\\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 564, + 326, + 582 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20, + "bbox_fs": [ + 104, + 564, + 326, + 582 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 103, + 586, + 500, + 721 + ], + "lines": [ + { + "bbox": [ + 103, + 586, + 500, + 721 + ], + "spans": [ + { + "bbox": [ + 103, + 586, + 500, + 721 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { ~ \\mathbb { E } [ ( u ^ { \\prime } , y ) ^ { 2 } ( x \\otimes x ) ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ \\langle A ^ { \\top } u , \\sigma ( W x ) \\rangle ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u ) _ { i } ^ { 2 } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ) _ { i } ( A ^ { \\top } u ) _ { j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\end{array}", + "type": "interline_equation", + "image_path": "101291ae3f1dfb35efea60fd71a64699c746c7f5141824822d740b69d4d3751e.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 103, + 586, + 500, + 631.0 + ], + "spans": [], + "index": 21 + }, + { + "bbox": [ + 103, + 631.0, + 500, + 676.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 103, + 676.0, + 500, + 721.0 + ], + "spans": [], + "index": 23 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 256, + 94 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 256, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 256, + 95 + ], + "score": 1.0, + "content": "Now, we subtract (5) by (6) to obtain", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "interline_equation", + "bbox": [ + 104, + 97, + 500, + 200 + ], + "lines": [ + { + "bbox": [ + 104, + 97, + 500, + 200 + ], + "spans": [ + { + "bbox": [ + 104, + 97, + 500, + 200 + ], + "score": 0.93, + "content": "\\begin{array} { r l r } { { 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } N _ { i j } N _ { i j } , } & { ( 8 } \\end{array}", + "type": "interline_equation", + "image_path": "7220bd01f0560530d7e36757673258014891855bb1aa2ff3d53f721f51a2c835.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 104, + 97, + 500, + 131.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 104, + 131.33333333333334, + 500, + 165.66666666666669 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 104, + 165.66666666666669, + 500, + 200.00000000000003 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 205, + 502, + 228 + ], + "lines": [ + { + "bbox": [ + 106, + 205, + 504, + 218 + ], + "spans": [ + { + "bbox": [ + 106, + 205, + 493, + 218 + ], + "score": 1.0, + "content": "where (7) uses (9) of the following Lemma 7, and (8) uses the definition of distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 494, + 208, + 504, + 216 + ], + "score": 0.83, + "content": "N", + "type": "inline_equation" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 216, + 505, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 166, + 230 + ], + "score": 1.0, + "content": "(Definition 1).", + "type": "text" + }, + { + "bbox": [ + 494, + 217, + 505, + 228 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5 + }, + { + "type": "text", + "bbox": [ + 105, + 231, + 503, + 244 + ], + "lines": [ + { + "bbox": [ + 105, + 230, + 503, + 246 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 425, + 246 + ], + "score": 1.0, + "content": "Lemma 7. Given input x coming from a symmetric distribution, for any vector", + "type": "text" + }, + { + "bbox": [ + 425, + 231, + 464, + 243 + ], + "score": 0.91, + "content": "a , b \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 230, + 503, + 246 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "interline_equation", + "bbox": [ + 146, + 248, + 464, + 272 + ], + "lines": [ + { + "bbox": [ + 146, + 248, + 464, + 272 + ], + "spans": [ + { + "bbox": [ + 146, + 248, + 464, + 272 + ], + "score": 0.93, + "content": "\\frac { 1 } { 2 } \\mathbb { E } \\left[ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\right] - \\mathbb { E } \\left[ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\right] = \\frac { 1 } { 2 } \\mathbb { E } \\left[ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\right]", + "type": "interline_equation", + "image_path": "cf5f4de62a69923c5584948b049a03559595c1ceaf02291eea8a28687ac7b859.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 146, + 248, + 464, + 272 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 277, + 124, + 288 + ], + "lines": [ + { + "bbox": [ + 105, + 276, + 125, + 288 + ], + "spans": [ + { + "bbox": [ + 105, + 276, + 125, + 288 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 290, + 505, + 315 + ], + "lines": [ + { + "bbox": [ + 111, + 290, + 505, + 315 + ], + "spans": [ + { + "bbox": [ + 111, + 290, + 505, + 315 + ], + "score": 0.91, + "content": "\\mathbb E \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\mathbb E \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) ( x \\otimes x ) \\big ] = \\frac 1 2 \\mathbb E \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\big ] ,", + "type": "interline_equation", + "image_path": "d087eb37f212f68334f425345fcac5d6b60fc382512995b3f054080ea5c147c1.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 111, + 290, + 505, + 315 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 323, + 336, + 335 + ], + "lines": [ + { + "bbox": [ + 105, + 322, + 338, + 336 + ], + "spans": [ + { + "bbox": [ + 105, + 322, + 338, + 336 + ], + "score": 1.0, + "content": "where the expectation is taken over the input distribution.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 106, + 346, + 504, + 370 + ], + "lines": [ + { + "bbox": [ + 106, + 346, + 504, + 359 + ], + "spans": [ + { + "bbox": [ + 106, + 346, + 504, + 359 + ], + "score": 1.0, + "content": "Proof. Here we just prove the first identity, because the proof of the second one is almost identical.", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 356, + 291, + 371 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 175, + 370 + ], + "score": 1.0, + "content": "First, we rewrite", + "type": "text" + }, + { + "bbox": [ + 175, + 357, + 246, + 371 + ], + "score": 0.92, + "content": "{ \\textstyle \\frac { 1 } { 2 } } \\mathbb { E } { \\bigl [ } ( a ^ { \\top } x ) ( b ^ { \\top } x ) { \\bigr ] }", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 356, + 291, + 370 + ], + "score": 1.0, + "content": "as follows", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11.5 + }, + { + "type": "interline_equation", + "bbox": [ + 112, + 375, + 498, + 400 + ], + "lines": [ + { + "bbox": [ + 112, + 375, + 498, + 400 + ], + "spans": [ + { + "bbox": [ + 112, + 375, + 498, + 400 + ], + "score": 0.91, + "content": "\\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\big ] + \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] .", + "type": "interline_equation", + "image_path": "fa2a2d7d181dd513f91a17b1ae262af487ecf911a24c0626c5c8c819ba79858b.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 112, + 375, + 498, + 400 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 403, + 505, + 441 + ], + "lines": [ + { + "bbox": [ + 104, + 402, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 104, + 402, + 244, + 419 + ], + "score": 1.0, + "content": "Thus, we only need to show that", + "type": "text" + }, + { + "bbox": [ + 245, + 403, + 482, + 419 + ], + "score": 0.87, + "content": "\\begin{array} { r } { \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 402, + 506, + 419 + ], + "score": 1.0, + "content": ". It’s", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 415, + 147, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 147, + 429 + ], + "score": 1.0, + "content": "clear that", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 184, + 425, + 424, + 441 + ], + "spans": [ + { + "bbox": [ + 184, + 425, + 424, + 441 + ], + "score": 0.87, + "content": "\\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] .", + "type": "inline_equation", + "image_path": "0f4bb1154f3eebe2f3b8bc397994a53b878417dd1e64a17380ccbe364d203bfc.jpg" + } + ], + "index": 16 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 105, + 443, + 350, + 454 + ], + "lines": [ + { + "bbox": [ + 106, + 441, + 349, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 441, + 154, + 456 + ], + "score": 1.0, + "content": "Since input", + "type": "text" + }, + { + "bbox": [ + 154, + 445, + 161, + 452 + ], + "score": 0.79, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 441, + 349, + 456 + ], + "score": 1.0, + "content": "comes from a symmetric distribution, we have", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 457, + 514, + 570 + ], + "lines": [ + { + "bbox": [ + 111, + 457, + 514, + 570 + ], + "spans": [ + { + "bbox": [ + 111, + 457, + 514, + 570 + ], + "score": 0.91, + "content": "\\begin{array} { r l } { \\boldsymbol { \\mathbb { z } } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] = \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } & { } \\\\ & { = \\frac { 1 } { 2 } \\Big ( \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } \\\\ & { \\quad \\quad + \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] \\Big ) } \\\\ & { = \\frac { 1 } { 2 } \\boldsymbol { \\mathbb { E } } \\Big [ \\big ( \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) + \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\big ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\Big ] } \\\\ & { = \\frac { 1 } { 2 } \\boldsymbol { \\mathbb { E } } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "8bfd7b604bb5a362c0850b8031d3cabab43f85b5379718751eb57a3ce4ebffb2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 111, + 457, + 514, + 494.6666666666667 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 111, + 494.6666666666667, + 514, + 532.3333333333334 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 111, + 532.3333333333334, + 514, + 570.0 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 574, + 504, + 598 + ], + "lines": [ + { + "bbox": [ + 105, + 572, + 506, + 588 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 133, + 588 + ], + "score": 1.0, + "content": "When", + "type": "text" + }, + { + "bbox": [ + 133, + 574, + 189, + 586 + ], + "score": 0.9, + "content": "a ^ { \\top } x b ^ { \\top } x > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 572, + 232, + 588 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 232, + 574, + 252, + 585 + ], + "score": 0.9, + "content": "a ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 572, + 270, + 588 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 270, + 574, + 288, + 585 + ], + "score": 0.89, + "content": "b ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 572, + 506, + 588 + ], + "score": 1.0, + "content": "are both positive or both negative. In either case, we", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 584, + 430, + 599 + ], + "spans": [ + { + "bbox": [ + 105, + 584, + 148, + 599 + ], + "score": 1.0, + "content": "know that", + "type": "text" + }, + { + "bbox": [ + 148, + 586, + 364, + 599 + ], + "score": 0.92, + "content": "\\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) + \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) = ( a ^ { \\top } x ) ( b ^ { \\top } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 584, + 430, + 599 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21.5 + }, + { + "type": "interline_equation", + "bbox": [ + 186, + 602, + 423, + 645 + ], + "lines": [ + { + "bbox": [ + 186, + 602, + 423, + 645 + ], + "spans": [ + { + "bbox": [ + 186, + 602, + 423, + 645 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } \\\\ { = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] , } \\end{array}", + "type": "interline_equation", + "image_path": "a3ad3f55cac3c8cc40f968085d9b5eb19aeeca3726679126538f0e7c6caff86b.jpg" + } + ] + } + ], + "index": 23.5, + "virtual_lines": [ + { + "bbox": [ + 186, + 602, + 423, + 623.5 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 186, + 623.5, + 423, + 645.0 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 648, + 209, + 659 + ], + "lines": [ + { + "bbox": [ + 106, + 646, + 209, + 660 + ], + "spans": [ + { + "bbox": [ + 106, + 646, + 209, + 660 + ], + "score": 1.0, + "content": "which finished our proof.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 675, + 497, + 703 + ], + "lines": [ + { + "bbox": [ + 105, + 673, + 501, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 673, + 276, + 691 + ], + "score": 1.0, + "content": "Finding span: Now, we find the span of", + "type": "text" + }, + { + "bbox": [ + 277, + 676, + 333, + 689 + ], + "score": 0.92, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 673, + 421, + 691 + ], + "score": 1.0, + "content": ". First, we recall that", + "type": "text" + }, + { + "bbox": [ + 421, + 675, + 501, + 689 + ], + "score": 0.94, + "content": "\\begin{array} { r } { f ( u ) = 2 \\mathbb { E } \\bigl [ ( u ^ { \\top } y ) } \\end{array}", + "type": "inline_equation" + } + ], + "index": 26 + }, + { + "bbox": [ + 107, + 687, + 478, + 703 + ], + "spans": [ + { + "bbox": [ + 107, + 688, + 342, + 702 + ], + "score": 0.81, + "content": "( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 687, + 478, + 703 + ], + "score": 1.0, + "content": ". Then, according to (8), we have", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26.5 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 707, + 514, + 736 + ], + "lines": [ + { + "bbox": [ + 111, + 707, + 514, + 736 + ], + "spans": [ + { + "bbox": [ + 111, + 707, + 514, + 736 + ], + "score": 0.83, + "content": "\\mathbf { \\Psi } ^ { * } ( u ) = 2 \\mathbb { E } \\left[ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } \\left[ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\right] = \\sum _ { \\substack { 1 \\leq i < j \\leq k } } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } N _ { i }", + "type": "interline_equation", + "image_path": "5a2268a6caa0a299bc95a3aa40e6c70b5f0372e06de1bbace7c98e01392a2ca5.jpg" + } + ] + } + ], + "index": 28, + "virtual_lines": [ + { + "bbox": [ + 111, + 707, + 514, + 736 + ], + "spans": [], + "index": 28 + } + ] + } + ], + "page_idx": 15, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 106, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 761 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "score": 1.0, + "content": "16", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 648, + 505, + 658 + ], + "lines": [ + { + "bbox": [ + 495, + 649, + 505, + 659 + ], + "spans": [ + { + "bbox": [ + 495, + 649, + 505, + 659 + ], + "score": 0.998, + "content": "□", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 256, + 94 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 256, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 256, + 95 + ], + "score": 1.0, + "content": "Now, we subtract (5) by (6) to obtain", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0, + "bbox_fs": [ + 106, + 82, + 256, + 95 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 104, + 97, + 500, + 200 + ], + "lines": [ + { + "bbox": [ + 104, + 97, + 500, + 200 + ], + "spans": [ + { + "bbox": [ + 104, + 97, + 500, + 200 + ], + "score": 0.93, + "content": "\\begin{array} { r l r } { { 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } N _ { i j } N _ { i j } , } & { ( 8 } \\end{array}", + "type": "interline_equation", + "image_path": "7220bd01f0560530d7e36757673258014891855bb1aa2ff3d53f721f51a2c835.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 104, + 97, + 500, + 131.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 104, + 131.33333333333334, + 500, + 165.66666666666669 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 104, + 165.66666666666669, + 500, + 200.00000000000003 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 205, + 502, + 228 + ], + "lines": [ + { + "bbox": [ + 106, + 205, + 504, + 218 + ], + "spans": [ + { + "bbox": [ + 106, + 205, + 493, + 218 + ], + "score": 1.0, + "content": "where (7) uses (9) of the following Lemma 7, and (8) uses the definition of distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 494, + 208, + 504, + 216 + ], + "score": 0.83, + "content": "N", + "type": "inline_equation" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 216, + 505, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 166, + 230 + ], + "score": 1.0, + "content": "(Definition 1).", + "type": "text" + }, + { + "bbox": [ + 494, + 217, + 505, + 228 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5, + "bbox_fs": [ + 105, + 205, + 505, + 230 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 231, + 503, + 244 + ], + "lines": [ + { + "bbox": [ + 105, + 230, + 503, + 246 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 425, + 246 + ], + "score": 1.0, + "content": "Lemma 7. Given input x coming from a symmetric distribution, for any vector", + "type": "text" + }, + { + "bbox": [ + 425, + 231, + 464, + 243 + ], + "score": 0.91, + "content": "a , b \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 230, + 503, + 246 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6, + "bbox_fs": [ + 105, + 230, + 503, + 246 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 146, + 248, + 464, + 272 + ], + "lines": [ + { + "bbox": [ + 146, + 248, + 464, + 272 + ], + "spans": [ + { + "bbox": [ + 146, + 248, + 464, + 272 + ], + "score": 0.93, + "content": "\\frac { 1 } { 2 } \\mathbb { E } \\left[ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\right] - \\mathbb { E } \\left[ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\right] = \\frac { 1 } { 2 } \\mathbb { E } \\left[ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\right]", + "type": "interline_equation", + "image_path": "cf5f4de62a69923c5584948b049a03559595c1ceaf02291eea8a28687ac7b859.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 146, + 248, + 464, + 272 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 277, + 124, + 288 + ], + "lines": [ + { + "bbox": [ + 105, + 276, + 125, + 288 + ], + "spans": [ + { + "bbox": [ + 105, + 276, + 125, + 288 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8, + "bbox_fs": [ + 105, + 276, + 125, + 288 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 290, + 505, + 315 + ], + "lines": [ + { + "bbox": [ + 111, + 290, + 505, + 315 + ], + "spans": [ + { + "bbox": [ + 111, + 290, + 505, + 315 + ], + "score": 0.91, + "content": "\\mathbb E \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\mathbb E \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) ( x \\otimes x ) \\big ] = \\frac 1 2 \\mathbb E \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\big ] ,", + "type": "interline_equation", + "image_path": "d087eb37f212f68334f425345fcac5d6b60fc382512995b3f054080ea5c147c1.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 111, + 290, + 505, + 315 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 323, + 336, + 335 + ], + "lines": [ + { + "bbox": [ + 105, + 322, + 338, + 336 + ], + "spans": [ + { + "bbox": [ + 105, + 322, + 338, + 336 + ], + "score": 1.0, + "content": "where the expectation is taken over the input distribution.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10, + "bbox_fs": [ + 105, + 322, + 338, + 336 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 346, + 504, + 370 + ], + "lines": [ + { + "bbox": [ + 106, + 346, + 504, + 359 + ], + "spans": [ + { + "bbox": [ + 106, + 346, + 504, + 359 + ], + "score": 1.0, + "content": "Proof. Here we just prove the first identity, because the proof of the second one is almost identical.", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 356, + 291, + 371 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 175, + 370 + ], + "score": 1.0, + "content": "First, we rewrite", + "type": "text" + }, + { + "bbox": [ + 175, + 357, + 246, + 371 + ], + "score": 0.92, + "content": "{ \\textstyle \\frac { 1 } { 2 } } \\mathbb { E } { \\bigl [ } ( a ^ { \\top } x ) ( b ^ { \\top } x ) { \\bigr ] }", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 356, + 291, + 370 + ], + "score": 1.0, + "content": "as follows", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11.5, + "bbox_fs": [ + 105, + 346, + 504, + 371 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 112, + 375, + 498, + 400 + ], + "lines": [ + { + "bbox": [ + 112, + 375, + 498, + 400 + ], + "spans": [ + { + "bbox": [ + 112, + 375, + 498, + 400 + ], + "score": 0.91, + "content": "\\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\big ] = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x \\leq 0 \\} \\big ] + \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] .", + "type": "interline_equation", + "image_path": "fa2a2d7d181dd513f91a17b1ae262af487ecf911a24c0626c5c8c819ba79858b.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 112, + 375, + 498, + 400 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 403, + 505, + 441 + ], + "lines": [ + { + "bbox": [ + 104, + 402, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 104, + 402, + 244, + 419 + ], + "score": 1.0, + "content": "Thus, we only need to show that", + "type": "text" + }, + { + "bbox": [ + 245, + 403, + 482, + 419 + ], + "score": 0.87, + "content": "\\begin{array} { r } { \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 402, + 506, + 419 + ], + "score": 1.0, + "content": ". It’s", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 415, + 147, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 147, + 429 + ], + "score": 1.0, + "content": "clear that", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 184, + 425, + 424, + 441 + ], + "spans": [ + { + "bbox": [ + 184, + 425, + 424, + 441 + ], + "score": 0.87, + "content": "\\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] .", + "type": "inline_equation", + "image_path": "0f4bb1154f3eebe2f3b8bc397994a53b878417dd1e64a17380ccbe364d203bfc.jpg" + } + ], + "index": 16 + } + ], + "index": 15, + "bbox_fs": [ + 104, + 402, + 506, + 441 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 443, + 350, + 454 + ], + "lines": [ + { + "bbox": [ + 106, + 441, + 349, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 441, + 154, + 456 + ], + "score": 1.0, + "content": "Since input", + "type": "text" + }, + { + "bbox": [ + 154, + 445, + 161, + 452 + ], + "score": 0.79, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 441, + 349, + 456 + ], + "score": 1.0, + "content": "comes from a symmetric distribution, we have", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17, + "bbox_fs": [ + 106, + 441, + 349, + 456 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 457, + 514, + 570 + ], + "lines": [ + { + "bbox": [ + 111, + 457, + 514, + 570 + ], + "spans": [ + { + "bbox": [ + 111, + 457, + 514, + 570 + ], + "score": 0.91, + "content": "\\begin{array} { r l } { \\boldsymbol { \\mathbb { z } } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] = \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } & { } \\\\ & { = \\frac { 1 } { 2 } \\Big ( \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } \\\\ & { \\quad \\quad + \\boldsymbol { \\mathbb { E } } \\big [ \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] \\Big ) } \\\\ & { = \\frac { 1 } { 2 } \\boldsymbol { \\mathbb { E } } \\Big [ \\big ( \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) + \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) \\big ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\Big ] } \\\\ & { = \\frac { 1 } { 2 } \\boldsymbol { \\mathbb { E } } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\boldsymbol { \\mathbb { 1 } } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "8bfd7b604bb5a362c0850b8031d3cabab43f85b5379718751eb57a3ce4ebffb2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 111, + 457, + 514, + 494.6666666666667 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 111, + 494.6666666666667, + 514, + 532.3333333333334 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 111, + 532.3333333333334, + 514, + 570.0 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 574, + 504, + 598 + ], + "lines": [ + { + "bbox": [ + 105, + 572, + 506, + 588 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 133, + 588 + ], + "score": 1.0, + "content": "When", + "type": "text" + }, + { + "bbox": [ + 133, + 574, + 189, + 586 + ], + "score": 0.9, + "content": "a ^ { \\top } x b ^ { \\top } x > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 572, + 232, + 588 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 232, + 574, + 252, + 585 + ], + "score": 0.9, + "content": "a ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 572, + 270, + 588 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 270, + 574, + 288, + 585 + ], + "score": 0.89, + "content": "b ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 572, + 506, + 588 + ], + "score": 1.0, + "content": "are both positive or both negative. In either case, we", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 584, + 430, + 599 + ], + "spans": [ + { + "bbox": [ + 105, + 584, + 148, + 599 + ], + "score": 1.0, + "content": "know that", + "type": "text" + }, + { + "bbox": [ + 148, + 586, + 364, + 599 + ], + "score": 0.92, + "content": "\\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) + \\sigma ( - a ^ { \\top } x ) \\sigma ( - b ^ { \\top } x ) = ( a ^ { \\top } x ) ( b ^ { \\top } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 584, + 430, + 599 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21.5, + "bbox_fs": [ + 105, + 572, + 506, + 599 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 186, + 602, + 423, + 645 + ], + "lines": [ + { + "bbox": [ + 186, + 602, + 423, + 645 + ], + "spans": [ + { + "bbox": [ + 186, + 602, + 423, + 645 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\big ] = \\mathbb { E } \\big [ \\sigma ( a ^ { \\top } x ) \\sigma ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] } \\\\ { = \\frac { 1 } { 2 } \\mathbb { E } \\big [ ( a ^ { \\top } x ) ( b ^ { \\top } x ) \\mathbb { 1 } \\{ a ^ { \\top } x b ^ { \\top } x > 0 \\} \\big ] , } \\end{array}", + "type": "interline_equation", + "image_path": "a3ad3f55cac3c8cc40f968085d9b5eb19aeeca3726679126538f0e7c6caff86b.jpg" + } + ] + } + ], + "index": 23.5, + "virtual_lines": [ + { + "bbox": [ + 186, + 602, + 423, + 623.5 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 186, + 623.5, + 423, + 645.0 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 648, + 209, + 659 + ], + "lines": [ + { + "bbox": [ + 106, + 646, + 209, + 660 + ], + "spans": [ + { + "bbox": [ + 106, + 646, + 209, + 660 + ], + "score": 1.0, + "content": "which finished our proof.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25, + "bbox_fs": [ + 106, + 646, + 209, + 660 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 675, + 497, + 703 + ], + "lines": [ + { + "bbox": [ + 105, + 673, + 501, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 673, + 276, + 691 + ], + "score": 1.0, + "content": "Finding span: Now, we find the span of", + "type": "text" + }, + { + "bbox": [ + 277, + 676, + 333, + 689 + ], + "score": 0.92, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 673, + 421, + 691 + ], + "score": 1.0, + "content": ". First, we recall that", + "type": "text" + }, + { + "bbox": [ + 421, + 675, + 501, + 689 + ], + "score": 0.94, + "content": "\\begin{array} { r } { f ( u ) = 2 \\mathbb { E } \\bigl [ ( u ^ { \\top } y ) } \\end{array}", + "type": "inline_equation" + } + ], + "index": 26 + }, + { + "bbox": [ + 107, + 687, + 478, + 703 + ], + "spans": [ + { + "bbox": [ + 107, + 688, + 342, + 702 + ], + "score": 0.81, + "content": "( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 687, + 478, + 703 + ], + "score": 1.0, + "content": ". Then, according to (8), we have", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26.5, + "bbox_fs": [ + 105, + 673, + 501, + 703 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 707, + 514, + 736 + ], + "lines": [ + { + "bbox": [ + 111, + 707, + 514, + 736 + ], + "spans": [ + { + "bbox": [ + 111, + 707, + 514, + 736 + ], + "score": 0.83, + "content": "\\mathbf { \\Psi } ^ { * } ( u ) = 2 \\mathbb { E } \\left[ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\right] - \\mathbb { E } \\left[ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\right] = \\sum _ { \\substack { 1 \\leq i < j \\leq k } } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } N _ { i }", + "type": "interline_equation", + "image_path": "5a2268a6caa0a299bc95a3aa40e6c70b5f0372e06de1bbace7c98e01392a2ca5.jpg" + } + ] + } + ], + "index": 28, + "virtual_lines": [ + { + "bbox": [ + 111, + 707, + 514, + 736 + ], + "spans": [], + "index": 28 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 127 + ], + "lines": [ + { + "bbox": [ + 104, + 81, + 507, + 96 + ], + "spans": [ + { + "bbox": [ + 104, + 81, + 216, + 96 + ], + "score": 1.0, + "content": "It is not hard to verify that", + "type": "text" + }, + { + "bbox": [ + 216, + 82, + 235, + 94 + ], + "score": 0.91, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 81, + 361, + 96 + ], + "score": 1.0, + "content": "is a pure neuron if and only if", + "type": "text" + }, + { + "bbox": [ + 361, + 82, + 401, + 95 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 81, + 447, + 96 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + }, + { + "bbox": [ + 447, + 82, + 487, + 95 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 81, + 507, + 96 + ], + "score": 1.0, + "content": "is a", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 108 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 473, + 108 + ], + "score": 1.0, + "content": "system of quadratic equations. So we linearize it by increasing the dimension (i.e., consider", + "type": "text" + }, + { + "bbox": [ + 473, + 96, + 493, + 106 + ], + "score": 0.86, + "content": "u _ { i } u _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 93, + 506, + 108 + ], + "score": 1.0, + "content": "as", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 104, + 105, + 506, + 120 + ], + "spans": [ + { + "bbox": [ + 104, + 105, + 432, + 120 + ], + "score": 1.0, + "content": "a single variable) similar to the FOOBI algorithm. Thus the number of variable is", + "type": "text" + }, + { + "bbox": [ + 432, + 105, + 502, + 120 + ], + "score": 0.91, + "content": "\\textstyle { \\binom { k } { 2 } } + k = k _ { 2 } + k _ { \\ O }", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 105, + 506, + 120 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 104, + 117, + 125, + 131 + ], + "spans": [ + { + "bbox": [ + 104, + 117, + 125, + 131 + ], + "score": 1.0, + "content": "i.e.,", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5 + }, + { + "type": "interline_equation", + "bbox": [ + 153, + 126, + 457, + 155 + ], + "lines": [ + { + "bbox": [ + 153, + 126, + 457, + 155 + ], + "spans": [ + { + "bbox": [ + 153, + 126, + 457, + 155 + ], + "score": 0.91, + "content": "\\exists T \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) } \\mathrm { ~ s u c h ~ t h a t ~ } T \\mathrm { v e c } ^ { * } ( U ) = f ( U ) = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } U A ) _ { i j } N _ { i j } .", + "type": "interline_equation", + "image_path": "65e669e1a93247b713bf3461d076fc815189065fce1e9d3d361eb4b98ef0eb36.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 153, + 126, + 457, + 135.66666666666666 + ], + "spans": [], + "index": 4 + }, + { + "bbox": [ + 153, + 135.66666666666666, + 457, + 145.33333333333331 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 153, + 145.33333333333331, + 457, + 154.99999999999997 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 157, + 502, + 170 + ], + "lines": [ + { + "bbox": [ + 105, + 155, + 503, + 173 + ], + "spans": [ + { + "bbox": [ + 105, + 155, + 346, + 173 + ], + "score": 1.0, + "content": "Now, we prove the Lemma 4 which shows the null space of", + "type": "text" + }, + { + "bbox": [ + 346, + 159, + 355, + 168 + ], + "score": 0.86, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 155, + 442, + 173 + ], + "score": 1.0, + "content": "is exactly the span of", + "type": "text" + }, + { + "bbox": [ + 443, + 157, + 499, + 171 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 499, + 155, + 503, + 173 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7 + }, + { + "type": "text", + "bbox": [ + 106, + 177, + 380, + 190 + ], + "lines": [ + { + "bbox": [ + 105, + 176, + 380, + 192 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 380, + 192 + ], + "score": 1.0, + "content": "Proof of Lemma 4. We divide the proof to the following two cases:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 131, + 198, + 505, + 243 + ], + "lines": [ + { + "bbox": [ + 129, + 198, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 129, + 198, + 218, + 210 + ], + "score": 1.0, + "content": "1. For any vector vec", + "type": "text" + }, + { + "bbox": [ + 218, + 199, + 238, + 210 + ], + "score": 0.56, + "content": "^ * ( U )", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 198, + 352, + 210 + ], + "score": 1.0, + "content": "belongs to the null space of", + "type": "text" + }, + { + "bbox": [ + 352, + 199, + 361, + 208 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 198, + 399, + 210 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 400, + 198, + 461, + 210 + ], + "score": 0.92, + "content": "T \\mathrm { v e c } ^ { * } ( U ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 198, + 505, + 210 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 142, + 209, + 505, + 221 + ], + "spans": [ + { + "bbox": [ + 142, + 209, + 306, + 221 + ], + "score": 1.0, + "content": "the RHS of (10) equals to 0 if and only if", + "type": "text" + }, + { + "bbox": [ + 307, + 209, + 337, + 219 + ], + "score": 0.9, + "content": "A ^ { \\top } { \\bar { U } } A", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 209, + 505, + 221 + ], + "score": 1.0, + "content": "is a diagonal matrix since the distinguish-", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 142, + 220, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 142, + 220, + 187, + 233 + ], + "score": 1.0, + "content": "ing matrix", + "type": "text" + }, + { + "bbox": [ + 187, + 221, + 197, + 230 + ], + "score": 0.82, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 220, + 295, + 233 + ], + "score": 1.0, + "content": "is full column rank and", + "type": "text" + }, + { + "bbox": [ + 296, + 220, + 326, + 230 + ], + "score": 0.9, + "content": "A ^ { \\top } U A", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 220, + 408, + 233 + ], + "score": 1.0, + "content": "is symmetric. Thus", + "type": "text" + }, + { + "bbox": [ + 409, + 221, + 444, + 232 + ], + "score": 0.9, + "content": "{ \\mathrm { v e c } } ^ { * } ( U )", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 220, + 506, + 233 + ], + "score": 1.0, + "content": "belongs to the", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 141, + 231, + 426, + 244 + ], + "spans": [ + { + "bbox": [ + 141, + 231, + 174, + 244 + ], + "score": 1.0, + "content": "span of", + "type": "text" + }, + { + "bbox": [ + 174, + 231, + 231, + 244 + ], + "score": 0.94, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 231, + 255, + 244 + ], + "score": 1.0, + "content": "since", + "type": "text" + }, + { + "bbox": [ + 255, + 231, + 308, + 242 + ], + "score": 0.92, + "content": "U = Z ^ { \\top } D Z", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 231, + 412, + 244 + ], + "score": 1.0, + "content": "for some diagonal matrix", + "type": "text" + }, + { + "bbox": [ + 412, + 232, + 421, + 241 + ], + "score": 0.84, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 231, + 426, + 244 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 10.5 + }, + { + "type": "text", + "bbox": [ + 131, + 246, + 504, + 293 + ], + "lines": [ + { + "bbox": [ + 128, + 246, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 128, + 246, + 203, + 261 + ], + "score": 1.0, + "content": "2. For any vector", + "type": "text" + }, + { + "bbox": [ + 203, + 247, + 238, + 259 + ], + "score": 0.72, + "content": "{ \\mathrm { v e c } } ^ { * } ( U )", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 246, + 340, + 261 + ], + "score": 1.0, + "content": "belonging to the span of", + "type": "text" + }, + { + "bbox": [ + 340, + 246, + 396, + 259 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 246, + 400, + 261 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 401, + 248, + 410, + 258 + ], + "score": 0.75, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 246, + 506, + 261 + ], + "score": 1.0, + "content": "is a linear combination", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 140, + 258, + 504, + 273 + ], + "spans": [ + { + "bbox": [ + 140, + 258, + 153, + 273 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 153, + 258, + 173, + 272 + ], + "score": 0.92, + "content": "z _ { i } z _ { i } ^ { \\dagger }", + "type": "inline_equation" + }, + { + "bbox": [ + 173, + 258, + 239, + 273 + ], + "score": 1.0, + "content": "’s. Furthermore,", + "type": "text" + }, + { + "bbox": [ + 239, + 259, + 281, + 271 + ], + "score": 0.92, + "content": "T \\mathrm { v e c } ^ { * } ( U )", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 258, + 384, + 273 + ], + "score": 1.0, + "content": "is a linear combination of", + "type": "text" + }, + { + "bbox": [ + 384, + 258, + 438, + 271 + ], + "score": 0.93, + "content": "\\tilde { T } \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 258, + 480, + 273 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + }, + { + "bbox": [ + 480, + 258, + 504, + 271 + ], + "score": 0.91, + "content": "A ^ { \\top } z _ { i }", + "type": "inline_equation" + } + ], + "index": 14 + }, + { + "bbox": [ + 142, + 271, + 505, + 282 + ], + "spans": [ + { + "bbox": [ + 142, + 271, + 347, + 282 + ], + "score": 1.0, + "content": "only has one non-zero entry due to the definition of", + "type": "text" + }, + { + "bbox": [ + 347, + 272, + 356, + 281 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 356, + 271, + 390, + 282 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 390, + 271, + 418, + 282 + ], + "score": 0.91, + "content": "i \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 418, + 271, + 505, + 282 + ], + "score": 1.0, + "content": ". Thus all coefficients", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 142, + 281, + 339, + 293 + ], + "spans": [ + { + "bbox": [ + 142, + 281, + 274, + 293 + ], + "score": 1.0, + "content": "in the RHS of (10) are 0. We get", + "type": "text" + }, + { + "bbox": [ + 275, + 281, + 335, + 293 + ], + "score": 0.93, + "content": "T \\mathrm { v e c } ^ { * } ( U ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 281, + 339, + 293 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 14.5 + }, + { + "type": "text", + "bbox": [ + 107, + 323, + 505, + 358 + ], + "lines": [ + { + "bbox": [ + 105, + 321, + 504, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 321, + 142, + 338 + ], + "score": 1.0, + "content": "Finding", + "type": "text" + }, + { + "bbox": [ + 142, + 325, + 151, + 335 + ], + "score": 0.81, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 321, + 361, + 338 + ], + "score": 1.0, + "content": "’s: Now, we prove the final Lemma 5 which finds all", + "type": "text" + }, + { + "bbox": [ + 362, + 325, + 371, + 335 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 321, + 447, + 338 + ], + "score": 1.0, + "content": "’s from the span of", + "type": "text" + }, + { + "bbox": [ + 447, + 323, + 504, + 336 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 335, + 308, + 347 + ], + "score": 1.0, + "content": "by using simultaneous diagonalization. Given all", + "type": "text" + }, + { + "bbox": [ + 308, + 336, + 318, + 346 + ], + "score": 0.82, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 335, + 506, + 347 + ], + "score": 1.0, + "content": "’s, this two-layer network can be reduced to a", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 346, + 466, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 346, + 443, + 358 + ], + "score": 1.0, + "content": "single-layer one. Then one can use Algorithm 1 to recover the first layer parameters", + "type": "text" + }, + { + "bbox": [ + 443, + 347, + 454, + 357 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 455, + 346, + 466, + 358 + ], + "score": 1.0, + "content": "’s.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 107, + 365, + 505, + 413 + ], + "lines": [ + { + "bbox": [ + 105, + 364, + 504, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 364, + 375, + 378 + ], + "score": 1.0, + "content": "Proof of Lemma 5. As we discussed before this lemma, we have", + "type": "text" + }, + { + "bbox": [ + 375, + 364, + 501, + 378 + ], + "score": 0.93, + "content": "X Y ^ { - 1 } = Z ^ { \\top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \\top } ) ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 364, + 504, + 378 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 375, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 105, + 375, + 370, + 391 + ], + "score": 1.0, + "content": "According to the following Lemma 8 (i.e., all diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 370, + 377, + 404, + 391 + ], + "score": 0.94, + "content": "D _ { x } D _ { y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 404, + 375, + 505, + 391 + ], + "score": 1.0, + "content": "are non-zero and distinc-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 390, + 505, + 403 + ], + "spans": [ + { + "bbox": [ + 105, + 390, + 160, + 403 + ], + "score": 1.0, + "content": "t), the matrix", + "type": "text" + }, + { + "bbox": [ + 160, + 390, + 189, + 401 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 390, + 210, + 403 + ], + "score": 1.0, + "content": "have", + "type": "text" + }, + { + "bbox": [ + 210, + 391, + 217, + 401 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 390, + 322, + 403 + ], + "score": 1.0, + "content": "eigenvectors and there are", + "type": "text" + }, + { + "bbox": [ + 323, + 391, + 339, + 402 + ], + "score": 0.84, + "content": "k z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 390, + 387, + 403 + ], + "score": 1.0, + "content": "’s, therefore", + "type": "text" + }, + { + "bbox": [ + 388, + 392, + 397, + 402 + ], + "score": 0.85, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 390, + 505, + 403 + ], + "score": 1.0, + "content": "’s are the only eigenvectors", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 401, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 104, + 401, + 117, + 412 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 401, + 146, + 412 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 401, + 149, + 412 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 494, + 402, + 505, + 413 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 21.5 + }, + { + "type": "text", + "bbox": [ + 106, + 416, + 505, + 450 + ], + "lines": [ + { + "bbox": [ + 105, + 415, + 506, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 330, + 429 + ], + "score": 1.0, + "content": "Lemma 8. With probability 1, all diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 330, + 417, + 347, + 428 + ], + "score": 0.89, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 415, + 366, + 429 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 366, + 417, + 382, + 427 + ], + "score": 0.89, + "content": "D _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 415, + 506, + 429 + ], + "score": 1.0, + "content": "are non-zero and all diagonal", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 426, + 507, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 154, + 441 + ], + "score": 1.0, + "content": "elements of", + "type": "text" + }, + { + "bbox": [ + 155, + 426, + 190, + 439 + ], + "score": 0.92, + "content": "D _ { X } \\dot { D } _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 426, + 268, + 441 + ], + "score": 1.0, + "content": "are distinct, where", + "type": "text" + }, + { + "bbox": [ + 268, + 427, + 330, + 438 + ], + "score": 0.93, + "content": "X = Z ^ { \\top } D _ { X } \\bar { Z }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 426, + 349, + 441 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 349, + 427, + 408, + 438 + ], + "score": 0.92, + "content": "Y = Z ^ { \\top } D _ { Y } Z", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 426, + 507, + 441 + ], + "score": 1.0, + "content": "are defined in Line 7 of", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 438, + 160, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 160, + 452 + ], + "score": 1.0, + "content": "Algorithm 2.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 461, + 505, + 529 + ], + "lines": [ + { + "bbox": [ + 105, + 460, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 321, + 475 + ], + "score": 1.0, + "content": "Proof. First, we know there exist diagonal matrices", + "type": "text" + }, + { + "bbox": [ + 321, + 462, + 385, + 474 + ], + "score": 0.92, + "content": "\\{ D _ { i } : i \\in [ k ] \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 460, + 434, + 475 + ], + "score": 1.0, + "content": "such that m", + "type": "text" + }, + { + "bbox": [ + 435, + 462, + 505, + 474 + ], + "score": 0.79, + "content": "\\mathsf { a t } ^ { * } ( \\mathsf { v e c } ^ { * } ( U _ { i } ) ) =", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 472, + 504, + 486 + ], + "spans": [ + { + "bbox": [ + 106, + 473, + 141, + 484 + ], + "score": 0.92, + "content": "Z ^ { \\top } \\dot { D } _ { i } Z", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 472, + 172, + 486 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 172, + 473, + 204, + 485 + ], + "score": 0.92, + "content": "i \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 472, + 237, + 486 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 238, + 473, + 328, + 485 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( U _ { i } ) : i \\in [ k ] \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 328, + 472, + 362, + 486 + ], + "score": 1.0, + "content": "are the", + "type": "text" + }, + { + "bbox": [ + 362, + 474, + 369, + 483 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 472, + 495, + 486 + ], + "score": 1.0, + "content": "-least right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 495, + 474, + 504, + 483 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 483, + 506, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 308, + 496 + ], + "score": 1.0, + "content": "(see Line 5 of Algorithm 2). Then, let the vector", + "type": "text" + }, + { + "bbox": [ + 308, + 484, + 344, + 495 + ], + "score": 0.91, + "content": "\\bar { d } _ { i } \\in \\mathbb { R } ^ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 483, + 461, + 496 + ], + "score": 1.0, + "content": "be the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 461, + 484, + 473, + 495 + ], + "score": 0.88, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 483, + 506, + 496 + ], + "score": 1.0, + "content": ", for all", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 492, + 507, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 495, + 130, + 505 + ], + "score": 0.9, + "content": "i \\in k", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 492, + 180, + 509 + ], + "score": 1.0, + "content": ". Let matrix", + "type": "text" + }, + { + "bbox": [ + 181, + 495, + 226, + 506 + ], + "score": 0.92, + "content": "Q \\in \\mathbb { R } ^ { k \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 492, + 315, + 509 + ], + "score": 1.0, + "content": "be a matrix where its", + "type": "text" + }, + { + "bbox": [ + 315, + 496, + 320, + 505 + ], + "score": 0.69, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 492, + 374, + 509 + ], + "score": 1.0, + "content": "-th column is", + "type": "text" + }, + { + "bbox": [ + 375, + 496, + 384, + 506 + ], + "score": 0.88, + "content": "d _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 492, + 413, + 509 + ], + "score": 1.0, + "content": ". Then", + "type": "text" + }, + { + "bbox": [ + 414, + 495, + 487, + 507 + ], + "score": 0.92, + "content": "D _ { X } = \\mathrm { d i a g } ( Q \\zeta _ { 1 } ) ", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 492, + 507, + 509 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 506, + 506, + 519 + ], + "spans": [ + { + "bbox": [ + 106, + 506, + 179, + 518 + ], + "score": 0.91, + "content": "D _ { Y } = \\mathrm { d i a g } ( Q \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 506, + 211, + 519 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 211, + 507, + 221, + 518 + ], + "score": 0.87, + "content": "\\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 221, + 506, + 240, + 519 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 240, + 507, + 250, + 518 + ], + "score": 0.88, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 506, + 318, + 519 + ], + "score": 1.0, + "content": "are two random", + "type": "text" + }, + { + "bbox": [ + 318, + 507, + 325, + 516 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 506, + 506, + 519 + ], + "score": 1.0, + "content": "-dimensional standard Gaussian vectors (see", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 517, + 203, + 530 + ], + "spans": [ + { + "bbox": [ + 105, + 517, + 203, + 530 + ], + "score": 1.0, + "content": "Line 7 of Algorithm 2).", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 29.5 + }, + { + "type": "text", + "bbox": [ + 106, + 533, + 505, + 603 + ], + "lines": [ + { + "bbox": [ + 105, + 532, + 505, + 547 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 132, + 547 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 533, + 222, + 546 + ], + "score": 0.92, + "content": "\\{ \\mathrm { v e c } ^ { * } ( U _ { i } ) : i \\in [ k ] \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 532, + 320, + 547 + ], + "score": 1.0, + "content": "are singular vectors of", + "type": "text" + }, + { + "bbox": [ + 320, + 534, + 329, + 544 + ], + "score": 0.79, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 532, + 374, + 547 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 375, + 534, + 433, + 545 + ], + "score": 0.91, + "content": "d _ { 1 } , d _ { 2 } , \\cdots , d _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 532, + 505, + 547 + ], + "score": 1.0, + "content": "are independent.", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 544, + 506, + 559 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 131, + 559 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + }, + { + "bbox": [ + 131, + 546, + 141, + 556 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 544, + 361, + 559 + ], + "score": 1.0, + "content": "has full rank and none of its rows are zero vectors. Let", + "type": "text" + }, + { + "bbox": [ + 361, + 546, + 366, + 555 + ], + "score": 0.72, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 544, + 407, + 559 + ], + "score": 1.0, + "content": "-th row of", + "type": "text" + }, + { + "bbox": [ + 407, + 546, + 416, + 556 + ], + "score": 0.84, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 544, + 429, + 559 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 429, + 545, + 442, + 557 + ], + "score": 0.88, + "content": "q _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 544, + 506, + 559 + ], + "score": 1.0, + "content": ". Let’s consider", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 556, + 506, + 570 + ], + "spans": [ + { + "bbox": [ + 106, + 557, + 123, + 568 + ], + "score": 0.88, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 556, + 197, + 570 + ], + "score": 1.0, + "content": "first. In order for", + "type": "text" + }, + { + "bbox": [ + 197, + 558, + 202, + 567 + ], + "score": 0.73, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 556, + 297, + 570 + ], + "score": 1.0, + "content": "-th diagonal element of", + "type": "text" + }, + { + "bbox": [ + 297, + 557, + 314, + 568 + ], + "score": 0.9, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 556, + 397, + 570 + ], + "score": 1.0, + "content": "to be zero, we need", + "type": "text" + }, + { + "bbox": [ + 398, + 556, + 439, + 569 + ], + "score": 0.92, + "content": "q _ { i } ^ { \\top } \\zeta _ { 1 } = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 556, + 469, + 570 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 469, + 559, + 478, + 568 + ], + "score": 0.85, + "content": "q _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 479, + 556, + 506, + 570 + ], + "score": 1.0, + "content": "is not", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 104, + 569, + 505, + 581 + ], + "spans": [ + { + "bbox": [ + 104, + 569, + 287, + 581 + ], + "score": 1.0, + "content": "a zero vector, we know the solution space of", + "type": "text" + }, + { + "bbox": [ + 288, + 569, + 324, + 581 + ], + "score": 0.92, + "content": "q _ { i } \\zeta _ { 1 } = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 569, + 460, + 581 + ], + "score": 1.0, + "content": "is a lower-dimension manifold in", + "type": "text" + }, + { + "bbox": [ + 461, + 569, + 474, + 579 + ], + "score": 0.89, + "content": "\\mathbb { R } ^ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 569, + 505, + 581 + ], + "score": 1.0, + "content": ", which", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 580, + 505, + 592 + ], + "spans": [ + { + "bbox": [ + 106, + 580, + 505, + 592 + ], + "score": 1.0, + "content": "has zero measure. Since finite union of zero-measure sets still has measure zero, the event that zero", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 590, + 437, + 604 + ], + "spans": [ + { + "bbox": [ + 105, + 590, + 267, + 604 + ], + "score": 1.0, + "content": "valued elements exist in the diagonal of", + "type": "text" + }, + { + "bbox": [ + 267, + 591, + 284, + 602 + ], + "score": 0.9, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 590, + 296, + 604 + ], + "score": 1.0, + "content": "or", + "type": "text" + }, + { + "bbox": [ + 296, + 591, + 312, + 602 + ], + "score": 0.9, + "content": "D _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 590, + 437, + 604 + ], + "score": 1.0, + "content": "happens with probability zero.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 35.5 + }, + { + "type": "text", + "bbox": [ + 106, + 607, + 505, + 654 + ], + "lines": [ + { + "bbox": [ + 103, + 605, + 504, + 622 + ], + "spans": [ + { + "bbox": [ + 103, + 605, + 118, + 622 + ], + "score": 1.0, + "content": "If", + "type": "text" + }, + { + "bbox": [ + 118, + 609, + 123, + 618 + ], + "score": 0.77, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 123, + 605, + 156, + 622 + ], + "score": 1.0, + "content": "-th and", + "type": "text" + }, + { + "bbox": [ + 157, + 609, + 163, + 619 + ], + "score": 0.8, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 605, + 270, + 622 + ], + "score": 1.0, + "content": "-th diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 270, + 606, + 307, + 621 + ], + "score": 0.93, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 605, + 428, + 622 + ], + "score": 1.0, + "content": "have same value, we have", + "type": "text" + }, + { + "bbox": [ + 429, + 606, + 504, + 620 + ], + "score": 0.9, + "content": "q _ { i } ^ { \\top } \\zeta _ { 1 } ( q _ { i } ^ { \\top } \\zeta _ { 2 } ) ^ { - 1 } \\ =", + "type": "inline_equation" + } + ], + "index": 39 + }, + { + "bbox": [ + 107, + 619, + 505, + 634 + ], + "spans": [ + { + "bbox": [ + 107, + 619, + 167, + 634 + ], + "score": 0.93, + "content": "q _ { j } ^ { \\top } \\zeta _ { 1 } ( q _ { j } ^ { \\top } \\zeta _ { 2 } ) ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 619, + 459, + 632 + ], + "score": 1.0, + "content": ". Again, we know the solution space is a lower-dimensional manifold in", + "type": "text" + }, + { + "bbox": [ + 459, + 620, + 476, + 631 + ], + "score": 0.87, + "content": "\\mathbb { R } ^ { 2 k }", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 619, + 505, + 632 + ], + "score": 1.0, + "content": "space,", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 631, + 506, + 643 + ], + "spans": [ + { + "bbox": [ + 106, + 631, + 506, + 643 + ], + "score": 1.0, + "content": "with measure zero. Since finite union of zero-measure sets still has measure zero, the event that", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 641, + 505, + 655 + ], + "spans": [ + { + "bbox": [ + 105, + 641, + 256, + 655 + ], + "score": 1.0, + "content": "duplicated diagonal elements exist in", + "type": "text" + }, + { + "bbox": [ + 257, + 641, + 293, + 655 + ], + "score": 0.93, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 641, + 418, + 655 + ], + "score": 1.0, + "content": "happens with probability zero.", + "type": "text" + }, + { + "bbox": [ + 494, + 642, + 505, + 653 + ], + "score": 1.0, + "content": "□", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 40.5 + }, + { + "type": "title", + "bbox": [ + 108, + 667, + 189, + 678 + ], + "lines": [ + { + "bbox": [ + 106, + 666, + 190, + 680 + ], + "spans": [ + { + "bbox": [ + 106, + 666, + 190, + 680 + ], + "score": 1.0, + "content": "A.2 NOISY CASE", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 43 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 505, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 311, + 700 + ], + "score": 1.0, + "content": "Now, we discuss how to handle the noisy case (i.e.", + "type": "text" + }, + { + "bbox": [ + 312, + 687, + 382, + 700 + ], + "score": 0.91, + "content": "y = \\sigma ( W x ) + \\xi )", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 687, + 505, + 700 + ], + "score": 1.0, + "content": ". The corresponding algorithm", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 698, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 302, + 711 + ], + "score": 1.0, + "content": "is described in Algorithm 3. Note that the noise", + "type": "text" + }, + { + "bbox": [ + 303, + 700, + 309, + 710 + ], + "score": 0.82, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 698, + 505, + 711 + ], + "score": 1.0, + "content": "only affects the first two steps, i.e., pure neuron", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 709, + 505, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 279, + 723 + ], + "score": 1.0, + "content": "detector (Lemma 3) and finding span of vec", + "type": "text" + }, + { + "bbox": [ + 279, + 710, + 312, + 722 + ], + "score": 0.74, + "content": "{ \\mathrm { ; } } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 709, + 505, + 723 + ], + "score": 1.0, + "content": "(Lemma 4). It does not affect the last two steps,", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 721, + 505, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 154, + 732 + ], + "score": 1.0, + "content": "i.e., finding", + "type": "text" + }, + { + "bbox": [ + 155, + 722, + 164, + 732 + ], + "score": 0.83, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 721, + 505, + 732 + ], + "score": 1.0, + "content": "’s from the span (Lemma 5) and learning the reduced single-layer network. Because", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 45.5 + } + ], + "page_idx": 16, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "17", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 302, + 504, + 312 + ], + "lines": [ + { + "bbox": [ + 496, + 304, + 504, + 313 + ], + "spans": [ + { + "bbox": [ + 496, + 304, + 504, + 313 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 127 + ], + "lines": [ + { + "bbox": [ + 104, + 81, + 507, + 96 + ], + "spans": [ + { + "bbox": [ + 104, + 81, + 216, + 96 + ], + "score": 1.0, + "content": "It is not hard to verify that", + "type": "text" + }, + { + "bbox": [ + 216, + 82, + 235, + 94 + ], + "score": 0.91, + "content": "u ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 81, + 361, + 96 + ], + "score": 1.0, + "content": "is a pure neuron if and only if", + "type": "text" + }, + { + "bbox": [ + 361, + 82, + 401, + 95 + ], + "score": 0.92, + "content": "f ( u ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 81, + 447, + 96 + ], + "score": 1.0, + "content": ". 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Thus the number of variable is", + "type": "text" + }, + { + "bbox": [ + 432, + 105, + 502, + 120 + ], + "score": 0.91, + "content": "\\textstyle { \\binom { k } { 2 } } + k = k _ { 2 } + k _ { \\ O }", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 105, + 506, + 120 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 104, + 117, + 125, + 131 + ], + "spans": [ + { + "bbox": [ + 104, + 117, + 125, + 131 + ], + "score": 1.0, + "content": "i.e.,", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5, + "bbox_fs": [ + 104, + 81, + 507, + 131 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 153, + 126, + 457, + 155 + ], + "lines": [ + { + "bbox": [ + 153, + 126, + 457, + 155 + ], + "spans": [ + { + "bbox": [ + 153, + 126, + 457, + 155 + ], + "score": 0.91, + "content": "\\exists T \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) } \\mathrm { ~ s u c h ~ t h a t ~ } T \\mathrm { v e c } ^ { * } ( U ) = f ( U ) = \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } U A ) _ { i j } N _ { i j } .", + "type": "interline_equation", + "image_path": "65e669e1a93247b713bf3461d076fc815189065fce1e9d3d361eb4b98ef0eb36.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 153, + 126, + 457, + 135.66666666666666 + ], + "spans": [], + "index": 4 + }, + { + "bbox": [ + 153, + 135.66666666666666, + 457, + 145.33333333333331 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 153, + 145.33333333333331, + 457, + 154.99999999999997 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 157, + 502, + 170 + ], + "lines": [ + { + "bbox": [ + 105, + 155, + 503, + 173 + ], + "spans": [ + { + "bbox": [ + 105, + 155, + 346, + 173 + ], + "score": 1.0, + "content": "Now, we prove the Lemma 4 which shows the null space of", + "type": "text" + }, + { + "bbox": [ + 346, + 159, + 355, + 168 + ], + "score": 0.86, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 155, + 442, + 173 + ], + "score": 1.0, + "content": "is exactly the span of", + "type": "text" + }, + { + "bbox": [ + 443, + 157, + 499, + 171 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 499, + 155, + 503, + 173 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7, + "bbox_fs": [ + 105, + 155, + 503, + 173 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 177, + 380, + 190 + ], + "lines": [ + { + "bbox": [ + 105, + 176, + 380, + 192 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 380, + 192 + ], + "score": 1.0, + "content": "Proof of Lemma 4. We divide the proof to the following two cases:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8, + "bbox_fs": [ + 105, + 176, + 380, + 192 + ] + }, + { + "type": "text", + "bbox": [ + 131, + 198, + 505, + 243 + ], + "lines": [ + { + "bbox": [ + 129, + 198, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 129, + 198, + 218, + 210 + ], + "score": 1.0, + "content": "1. For any vector vec", + "type": "text" + }, + { + "bbox": [ + 218, + 199, + 238, + 210 + ], + "score": 0.56, + "content": "^ * ( U )", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 198, + 352, + 210 + ], + "score": 1.0, + "content": "belongs to the null space of", + "type": "text" + }, + { + "bbox": [ + 352, + 199, + 361, + 208 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 198, + 399, + 210 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 400, + 198, + 461, + 210 + ], + "score": 0.92, + "content": "T \\mathrm { v e c } ^ { * } ( U ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 198, + 505, + 210 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 142, + 209, + 505, + 221 + ], + "spans": [ + { + "bbox": [ + 142, + 209, + 306, + 221 + ], + "score": 1.0, + "content": "the RHS of (10) equals to 0 if and only if", + "type": "text" + }, + { + "bbox": [ + 307, + 209, + 337, + 219 + ], + "score": 0.9, + "content": "A ^ { \\top } { \\bar { U } } A", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 209, + 505, + 221 + ], + "score": 1.0, + "content": "is a diagonal matrix since the distinguish-", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 142, + 220, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 142, + 220, + 187, + 233 + ], + "score": 1.0, + "content": "ing matrix", + "type": "text" + }, + { + "bbox": [ + 187, + 221, + 197, + 230 + ], + "score": 0.82, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 220, + 295, + 233 + ], + "score": 1.0, + "content": "is full column rank and", + "type": "text" + }, + { + "bbox": [ + 296, + 220, + 326, + 230 + ], + "score": 0.9, + "content": "A ^ { \\top } U A", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 220, + 408, + 233 + ], + "score": 1.0, + "content": "is symmetric. 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Note that", + "type": "text" + }, + { + "bbox": [ + 480, + 258, + 504, + 271 + ], + "score": 0.91, + "content": "A ^ { \\top } z _ { i }", + "type": "inline_equation" + } + ], + "index": 14 + }, + { + "bbox": [ + 142, + 271, + 505, + 282 + ], + "spans": [ + { + "bbox": [ + 142, + 271, + 347, + 282 + ], + "score": 1.0, + "content": "only has one non-zero entry due to the definition of", + "type": "text" + }, + { + "bbox": [ + 347, + 272, + 356, + 281 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 356, + 271, + 390, + 282 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 390, + 271, + 418, + 282 + ], + "score": 0.91, + "content": "i \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 418, + 271, + 505, + 282 + ], + "score": 1.0, + "content": ". Thus all coefficients", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 142, + 281, + 339, + 293 + ], + "spans": [ + { + "bbox": [ + 142, + 281, + 274, + 293 + ], + "score": 1.0, + "content": "in the RHS of (10) are 0. We get", + "type": "text" + }, + { + "bbox": [ + 275, + 281, + 335, + 293 + ], + "score": 0.93, + "content": "T \\mathrm { v e c } ^ { * } ( U ) = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 281, + 339, + 293 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 14.5, + "bbox_fs": [ + 128, + 246, + 506, + 293 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 323, + 505, + 358 + ], + "lines": [ + { + "bbox": [ + 105, + 321, + 504, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 321, + 142, + 338 + ], + "score": 1.0, + "content": "Finding", + "type": "text" + }, + { + "bbox": [ + 142, + 325, + 151, + 335 + ], + "score": 0.81, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 321, + 361, + 338 + ], + "score": 1.0, + "content": "’s: Now, we prove the final Lemma 5 which finds all", + "type": "text" + }, + { + "bbox": [ + 362, + 325, + 371, + 335 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 321, + 447, + 338 + ], + "score": 1.0, + "content": "’s from the span of", + "type": "text" + }, + { + "bbox": [ + 447, + 323, + 504, + 336 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 335, + 308, + 347 + ], + "score": 1.0, + "content": "by using simultaneous diagonalization. Given all", + "type": "text" + }, + { + "bbox": [ + 308, + 336, + 318, + 346 + ], + "score": 0.82, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 335, + 506, + 347 + ], + "score": 1.0, + "content": "’s, this two-layer network can be reduced to a", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 346, + 466, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 346, + 443, + 358 + ], + "score": 1.0, + "content": "single-layer one. Then one can use Algorithm 1 to recover the first layer parameters", + "type": "text" + }, + { + "bbox": [ + 443, + 347, + 454, + 357 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 455, + 346, + 466, + 358 + ], + "score": 1.0, + "content": "’s.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18, + "bbox_fs": [ + 105, + 321, + 506, + 358 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 365, + 505, + 413 + ], + "lines": [ + { + "bbox": [ + 105, + 364, + 504, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 364, + 375, + 378 + ], + "score": 1.0, + "content": "Proof of Lemma 5. As we discussed before this lemma, we have", + "type": "text" + }, + { + "bbox": [ + 375, + 364, + 501, + 378 + ], + "score": 0.93, + "content": "X Y ^ { - 1 } = Z ^ { \\top } D _ { X } D _ { Y } ^ { - 1 } ( Z ^ { \\top } ) ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 364, + 504, + 378 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 375, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 105, + 375, + 370, + 391 + ], + "score": 1.0, + "content": "According to the following Lemma 8 (i.e., all diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 370, + 377, + 404, + 391 + ], + "score": 0.94, + "content": "D _ { x } D _ { y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 404, + 375, + 505, + 391 + ], + "score": 1.0, + "content": "are non-zero and distinc-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 390, + 505, + 403 + ], + "spans": [ + { + "bbox": [ + 105, + 390, + 160, + 403 + ], + "score": 1.0, + "content": "t), the matrix", + "type": "text" + }, + { + "bbox": [ + 160, + 390, + 189, + 401 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 390, + 210, + 403 + ], + "score": 1.0, + "content": "have", + "type": "text" + }, + { + "bbox": [ + 210, + 391, + 217, + 401 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 390, + 322, + 403 + ], + "score": 1.0, + "content": "eigenvectors and there are", + "type": "text" + }, + { + "bbox": [ + 323, + 391, + 339, + 402 + ], + "score": 0.84, + "content": "k z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 390, + 387, + 403 + ], + "score": 1.0, + "content": "’s, therefore", + "type": "text" + }, + { + "bbox": [ + 388, + 392, + 397, + 402 + ], + "score": 0.85, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 390, + 505, + 403 + ], + "score": 1.0, + "content": "’s are the only eigenvectors", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 401, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 104, + 401, + 117, + 412 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 401, + 146, + 412 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 401, + 149, + 412 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 494, + 402, + 505, + 413 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 21.5, + "bbox_fs": [ + 104, + 364, + 505, + 413 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 416, + 505, + 450 + ], + "lines": [ + { + "bbox": [ + 105, + 415, + 506, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 330, + 429 + ], + "score": 1.0, + "content": "Lemma 8. With probability 1, all diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 330, + 417, + 347, + 428 + ], + "score": 0.89, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 415, + 366, + 429 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 366, + 417, + 382, + 427 + ], + "score": 0.89, + "content": "D _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 415, + 506, + 429 + ], + "score": 1.0, + "content": "are non-zero and all diagonal", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 426, + 507, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 154, + 441 + ], + "score": 1.0, + "content": "elements of", + "type": "text" + }, + { + "bbox": [ + 155, + 426, + 190, + 439 + ], + "score": 0.92, + "content": "D _ { X } \\dot { D } _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 426, + 268, + 441 + ], + "score": 1.0, + "content": "are distinct, where", + "type": "text" + }, + { + "bbox": [ + 268, + 427, + 330, + 438 + ], + "score": 0.93, + "content": "X = Z ^ { \\top } D _ { X } \\bar { Z }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 426, + 349, + 441 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 349, + 427, + 408, + 438 + ], + "score": 0.92, + "content": "Y = Z ^ { \\top } D _ { Y } Z", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 426, + 507, + 441 + ], + "score": 1.0, + "content": "are defined in Line 7 of", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 438, + 160, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 160, + 452 + ], + "score": 1.0, + "content": "Algorithm 2.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25, + "bbox_fs": [ + 105, + 415, + 507, + 452 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 461, + 505, + 529 + ], + "lines": [ + { + "bbox": [ + 105, + 460, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 321, + 475 + ], + "score": 1.0, + "content": "Proof. First, we know there exist diagonal matrices", + "type": "text" + }, + { + "bbox": [ + 321, + 462, + 385, + 474 + ], + "score": 0.92, + "content": "\\{ D _ { i } : i \\in [ k ] \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 460, + 434, + 475 + ], + "score": 1.0, + "content": "such that m", + "type": "text" + }, + { + "bbox": [ + 435, + 462, + 505, + 474 + ], + "score": 0.79, + "content": "\\mathsf { a t } ^ { * } ( \\mathsf { v e c } ^ { * } ( U _ { i } ) ) =", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 472, + 504, + 486 + ], + "spans": [ + { + "bbox": [ + 106, + 473, + 141, + 484 + ], + "score": 0.92, + "content": "Z ^ { \\top } \\dot { D } _ { i } Z", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 472, + 172, + 486 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 172, + 473, + 204, + 485 + ], + "score": 0.92, + "content": "i \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 472, + 237, + 486 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 238, + 473, + 328, + 485 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( U _ { i } ) : i \\in [ k ] \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 328, + 472, + 362, + 486 + ], + "score": 1.0, + "content": "are the", + "type": "text" + }, + { + "bbox": [ + 362, + 474, + 369, + 483 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 472, + 495, + 486 + ], + "score": 1.0, + "content": "-least right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 495, + 474, + 504, + 483 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 483, + 506, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 308, + 496 + ], + "score": 1.0, + "content": "(see Line 5 of Algorithm 2). Then, let the vector", + "type": "text" + }, + { + "bbox": [ + 308, + 484, + 344, + 495 + ], + "score": 0.91, + "content": "\\bar { d } _ { i } \\in \\mathbb { R } ^ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 483, + 461, + 496 + ], + "score": 1.0, + "content": "be the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 461, + 484, + 473, + 495 + ], + "score": 0.88, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 483, + 506, + 496 + ], + "score": 1.0, + "content": ", for all", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 492, + 507, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 495, + 130, + 505 + ], + "score": 0.9, + "content": "i \\in k", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 492, + 180, + 509 + ], + "score": 1.0, + "content": ". Let matrix", + "type": "text" + }, + { + "bbox": [ + 181, + 495, + 226, + 506 + ], + "score": 0.92, + "content": "Q \\in \\mathbb { R } ^ { k \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 492, + 315, + 509 + ], + "score": 1.0, + "content": "be a matrix where its", + "type": "text" + }, + { + "bbox": [ + 315, + 496, + 320, + 505 + ], + "score": 0.69, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 492, + 374, + 509 + ], + "score": 1.0, + "content": "-th column is", + "type": "text" + }, + { + "bbox": [ + 375, + 496, + 384, + 506 + ], + "score": 0.88, + "content": "d _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 492, + 413, + 509 + ], + "score": 1.0, + "content": ". Then", + "type": "text" + }, + { + "bbox": [ + 414, + 495, + 487, + 507 + ], + "score": 0.92, + "content": "D _ { X } = \\mathrm { d i a g } ( Q \\zeta _ { 1 } ) ", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 492, + 507, + 509 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 506, + 506, + 519 + ], + "spans": [ + { + "bbox": [ + 106, + 506, + 179, + 518 + ], + "score": 0.91, + "content": "D _ { Y } = \\mathrm { d i a g } ( Q \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 506, + 211, + 519 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 211, + 507, + 221, + 518 + ], + "score": 0.87, + "content": "\\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 221, + 506, + 240, + 519 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 240, + 507, + 250, + 518 + ], + "score": 0.88, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 506, + 318, + 519 + ], + "score": 1.0, + "content": "are two random", + "type": "text" + }, + { + "bbox": [ + 318, + 507, + 325, + 516 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 506, + 506, + 519 + ], + "score": 1.0, + "content": "-dimensional standard Gaussian vectors (see", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 517, + 203, + 530 + ], + "spans": [ + { + "bbox": [ + 105, + 517, + 203, + 530 + ], + "score": 1.0, + "content": "Line 7 of Algorithm 2).", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 29.5, + "bbox_fs": [ + 105, + 460, + 507, + 530 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 533, + 505, + 603 + ], + "lines": [ + { + "bbox": [ + 105, + 532, + 505, + 547 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 132, + 547 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 533, + 222, + 546 + ], + "score": 0.92, + "content": "\\{ \\mathrm { v e c } ^ { * } ( U _ { i } ) : i \\in [ k ] \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 532, + 320, + 547 + ], + "score": 1.0, + "content": "are singular vectors of", + "type": "text" + }, + { + "bbox": [ + 320, + 534, + 329, + 544 + ], + "score": 0.79, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 532, + 374, + 547 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 375, + 534, + 433, + 545 + ], + "score": 0.91, + "content": "d _ { 1 } , d _ { 2 } , \\cdots , d _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 532, + 505, + 547 + ], + "score": 1.0, + "content": "are independent.", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 544, + 506, + 559 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 131, + 559 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + }, + { + "bbox": [ + 131, + 546, + 141, + 556 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 544, + 361, + 559 + ], + "score": 1.0, + "content": "has full rank and none of its rows are zero vectors. Let", + "type": "text" + }, + { + "bbox": [ + 361, + 546, + 366, + 555 + ], + "score": 0.72, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 544, + 407, + 559 + ], + "score": 1.0, + "content": "-th row of", + "type": "text" + }, + { + "bbox": [ + 407, + 546, + 416, + 556 + ], + "score": 0.84, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 544, + 429, + 559 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 429, + 545, + 442, + 557 + ], + "score": 0.88, + "content": "q _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 544, + 506, + 559 + ], + "score": 1.0, + "content": ". Let’s consider", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 556, + 506, + 570 + ], + "spans": [ + { + "bbox": [ + 106, + 557, + 123, + 568 + ], + "score": 0.88, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 556, + 197, + 570 + ], + "score": 1.0, + "content": "first. 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The", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 104, + 448, + 506, + 462 + ], + "spans": [ + { + "bbox": [ + 104, + 448, + 506, + 462 + ], + "score": 1.0, + "content": "separation of the input samples into two halves is also to avoid correlations between the steps, and", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 462, + 295, + 472 + ], + "spans": [ + { + "bbox": [ + 106, + 462, + 295, + 472 + ], + "score": 1.0, + "content": "is not necessary if we have the exact moments.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27, + "bbox_fs": [ + 104, + 417, + 506, + 472 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 482, + 505, + 527 + ], + "lines": [ + { + "bbox": [ + 105, + 482, + 505, + 495 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 505, + 495 + ], + "score": 1.0, + "content": "Modification for pure neuron detector: Recall that in the noiseless case, our pure neuron detector", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 492, + 506, + 506 + ], + "spans": [ + { + "bbox": [ + 105, + 492, + 172, + 506 + ], + "score": 1.0, + "content": "contains a term", + "type": "text" + }, + { + "bbox": [ + 172, + 493, + 247, + 505 + ], + "score": 0.93, + "content": "\\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) ]", + "type": "inline_equation" + }, + { + "bbox": [ + 247, + 492, + 506, + 506 + ], + "score": 1.0, + "content": ", which causes a noise square term in the noisy case. 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The corresponding lemma is stated as follows (the proof is", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 721, + 268, + 733 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 268, + 733 + ], + "score": 1.0, + "content": "exactly the same as previous Lemma 4):", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 44, + "bbox_fs": [ + 105, + 699, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 80, + 505, + 117 + ], + "lines": [ + { + "bbox": [ + 104, + 78, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 104, + 78, + 174, + 96 + ], + "score": 1.0, + "content": "Lemma 10. Let", + "type": "text" + }, + { + "bbox": [ + 175, + 83, + 184, + 92 + ], + "score": 0.54, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 78, + 241, + 96 + ], + "score": 1.0, + "content": "be the unique", + "type": "text" + }, + { + "bbox": [ + 242, + 80, + 289, + 92 + ], + "score": 0.92, + "content": "\\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 290, + 78, + 372, + 96 + ], + "score": 1.0, + "content": "matrix that satisfies", + "type": "text" + }, + { + "bbox": [ + 373, + 82, + 459, + 95 + ], + "score": 0.91, + "content": "T \\nu e c ^ { * } ( u u ^ { \\top } ) = f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 78, + 506, + 96 + ], + "score": 1.0, + "content": "(defined in", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 146, + 106 + ], + "score": 1.0, + "content": "Equation", + "type": "text" + }, + { + "bbox": [ + 146, + 94, + 157, + 104 + ], + "score": 0.58, + "content": "1 l", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 93, + 486, + 106 + ], + "score": 1.0, + "content": "), suppose the augmented distinguishing matrix is full rank, then the nullspace of", + "type": "text" + }, + { + "bbox": [ + 486, + 94, + 495, + 104 + ], + "score": 0.72, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 93, + 505, + 106 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 243, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 183, + 118 + ], + "score": 1.0, + "content": "exactly the span of", + "type": "text" + }, + { + "bbox": [ + 184, + 104, + 239, + 117 + ], + "score": 0.94, + "content": "\\{ \\nu e c ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 104, + 243, + 118 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 107, + 128, + 504, + 151 + ], + "lines": [ + { + "bbox": [ + 106, + 127, + 504, + 140 + ], + "spans": [ + { + "bbox": [ + 106, + 127, + 504, + 140 + ], + "score": 1.0, + "content": "Similar to Theorem 4, we provide the following theorem for the noisy case. The proof is almost the", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 139, + 409, + 151 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 409, + 151 + ], + "score": 1.0, + "content": "same as Theorem 4 by using the noisy version lemmas (Lemmas 9 and 10).", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + }, + { + "type": "text", + "bbox": [ + 107, + 155, + 505, + 190 + ], + "lines": [ + { + "bbox": [ + 105, + 156, + 504, + 170 + ], + "spans": [ + { + "bbox": [ + 105, + 156, + 196, + 170 + ], + "score": 1.0, + "content": "Theorem 5. Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 156, + 255, + 169 + ], + "score": 0.91, + "content": "\\mathbb { E } [ x x ^ { \\top } ] , A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 156, + 423, + 170 + ], + "score": 1.0, + "content": "and the augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 424, + 157, + 435, + 167 + ], + "score": 0.55, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 156, + 504, + 170 + ], + "score": 1.0, + "content": "are all full rank,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 168, + 505, + 180 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 505, + 180 + ], + "score": 1.0, + "content": "and Algorithm 3 has access to the exact moments, then the network returned by the algorithm com-", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 179, + 359, + 191 + ], + "spans": [ + { + "bbox": [ + 105, + 179, + 359, + 191 + ], + "score": 1.0, + "content": "putes exactly the same function as the original neural network.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 106, + 201, + 358, + 214 + ], + "lines": [ + { + "bbox": [ + 105, + 201, + 359, + 216 + ], + "spans": [ + { + "bbox": [ + 105, + 201, + 359, + 216 + ], + "score": 1.0, + "content": "Now, we only need to prove Lemma 9 to finish this noise case.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 106, + 224, + 505, + 258 + ], + "lines": [ + { + "bbox": [ + 105, + 223, + 505, + 237 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 505, + 237 + ], + "score": 1.0, + "content": "Proof of Lemma 9. Similar to (5) and (6), we deduce these three terms in RHS of (11) one by one", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 235, + 506, + 249 + ], + "spans": [ + { + "bbox": [ + 105, + 235, + 469, + 249 + ], + "score": 1.0, + "content": "as follows. For the first term, it is exactly the same as (5) since the expectation is linear wrt.", + "type": "text" + }, + { + "bbox": [ + 470, + 237, + 476, + 248 + ], + "score": 0.83, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 476, + 235, + 506, + 249 + ], + "score": 1.0, + "content": ". Thus,", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 246, + 142, + 258 + ], + "spans": [ + { + "bbox": [ + 106, + 246, + 142, + 258 + ], + "score": 1.0, + "content": "we have", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10 + }, + { + "type": "interline_equation", + "bbox": [ + 114, + 266, + 496, + 316 + ], + "lines": [ + { + "bbox": [ + 114, + 266, + 496, + 316 + ], + "spans": [ + { + "bbox": [ + 114, + 266, + 496, + 316 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\ 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "616e7caa9ab5ce6b7a92a319b290cc41177862d6d5a1b5a70ea78356354707f9.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 114, + 266, + 496, + 282.6666666666667 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 114, + 282.6666666666667, + 496, + 299.33333333333337 + ], + "spans": [], + "index": 13 + }, + { + "bbox": [ + 114, + 299.33333333333337, + 496, + 316.00000000000006 + ], + "spans": [], + "index": 14 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 343, + 505, + 368 + ], + "lines": [ + { + "bbox": [ + 105, + 343, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 244, + 358 + ], + "score": 1.0, + "content": "Now, let’s look at the second term", + "type": "text" + }, + { + "bbox": [ + 245, + 344, + 321, + 357 + ], + "score": 0.92, + "content": "\\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 321, + 343, + 506, + 358 + ], + "score": 1.0, + "content": "which is slightly different from (6) due to the", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 355, + 451, + 368 + ], + "spans": [ + { + "bbox": [ + 106, + 355, + 130, + 368 + ], + "score": 1.0, + "content": "noise", + "type": "text" + }, + { + "bbox": [ + 130, + 356, + 136, + 367 + ], + "score": 0.83, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 355, + 451, + 368 + ], + "score": 1.0, + "content": ". Particularly, we add the third term to cancel this extra noise square term later.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5 + }, + { + "type": "interline_equation", + "bbox": [ + 105, + 376, + 500, + 459 + ], + "lines": [ + { + "bbox": [ + 105, + 376, + 500, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 376, + 500, + 459 + ], + "score": 0.88, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } ( A \\sigma ( W x ) + \\xi ) ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) ^ { 2 } ( x \\otimes x ) \\big ] + \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\end{array}", + "type": "interline_equation", + "image_path": "39442405ba6e04f091d79beaba8ccf54706237c6151f23829305430730d2ee26.jpg" + } + ] + } + ], + "index": 18, + "virtual_lines": [ + { + "bbox": [ + 105, + 376, + 500, + 403.6666666666667 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 105, + 403.6666666666667, + 500, + 431.33333333333337 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 105, + 431.33333333333337, + 500, + 459.00000000000006 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "interline_equation", + "bbox": [ + 117, + 470, + 207, + 487 + ], + "lines": [ + { + "bbox": [ + 117, + 470, + 207, + 487 + ], + "spans": [ + { + "bbox": [ + 117, + 470, + 207, + 487 + ], + "score": 0.63, + "content": "+ \\mathbb { E } \\left[ ( u ^ { \\top } \\xi ) ^ { 2 } ( x \\otimes x ) \\right] ,", + "type": "interline_equation", + "image_path": "d01a73e8a1194fd78c4845f53e552f35adca743a4d4e54b3d3c7effeea5bd42e.jpg" + } + ] + } + ], + "index": 20, + "virtual_lines": [ + { + "bbox": [ + 117, + 470, + 207, + 487 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 496, + 188, + 508 + ], + "lines": [ + { + "bbox": [ + 105, + 495, + 189, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 189, + 510 + ], + "score": 1.0, + "content": "where (15) uses (6).", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 106, + 513, + 217, + 525 + ], + "lines": [ + { + "bbox": [ + 105, + 512, + 217, + 526 + ], + "spans": [ + { + "bbox": [ + 105, + 512, + 217, + 526 + ], + "score": 1.0, + "content": "For the third term, we have", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 22 + }, + { + "type": "interline_equation", + "bbox": [ + 108, + 532, + 499, + 711 + ], + "lines": [ + { + "bbox": [ + 108, + 532, + 499, + 711 + ], + "spans": [ + { + "bbox": [ + 108, + 532, + 499, + 711 + ], + "score": 0.93, + "content": "\\begin{array} { r l r } { { \\mathbb { E } [ ( u ^ { \\top } y ) ^ { 2 } ] - 2 \\mathbb { E } [ ( u ^ { \\top } y ) u ^ { \\top } ] \\mathbb { E } [ x ^ { \\top \\cdot \\tau } ] ^ { - 1 } \\mathbb { E } [ ( u ^ { \\top } y ) x ] } } \\\\ & { } & { = \\mathbb { E } [ ( u ^ { \\top } \\mathcal { A } \\sigma ( W x ) ) ^ { 2 } ] + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] - \\frac { 1 } { 2 } \\mathbb { E } [ \\langle \\mathcal { A } ^ { \\top } , u , W x \\rangle ^ { 2 } ] } \\\\ & { = \\sum _ { 1 \\leq i \\leq i } A ^ { \\top } u u ^ { \\top } A \\rangle _ { 3 \\mathbb { E } } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ^ { 2 } ] - \\frac { 1 } { 2 } \\sum _ { 1 \\leq i \\leq i } A ^ { \\top } u ^ { \\top } A \\rangle \\mathbb { E } [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ] } \\\\ & { } & { \\overset { \\mathrm { ( 4 ) } } { = } + \\sum _ { 1 \\leq i \\leq i } \\sum _ { 1 \\leq i } ( A ^ { \\top } u w _ { i } ^ { \\top } A ) _ { i \\beta } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) z ( w _ { i } ^ { \\top } x ) ] - \\sum _ { 1 \\leq i \\leq i } ( A ^ { \\top } u u ^ { \\top } A ) _ { i \\beta } \\mathbb { E } [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ] } \\\\ & { } & { + \\frac { 1 } { 1 \\leq i \\leq i \\leq j \\leq k } } \\\\ & { } & { = + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] } \\\\ & { = - \\sum _ { 1 \\leq i \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { B } [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ] \\{ ( w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 ) \\} + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] } \\\\ & { = - \\sum _ { 1 \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } m _ { i i } + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] , } \\\\ & = - \\sum _ { 1 \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ \\end{array}", + "type": "interline_equation", + "image_path": "40c7ff7f9d89e584e1979504b68c4781bde7d8ccf57295860e47962673dfaec2.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 108, + 532, + 499, + 591.6666666666666 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 108, + 591.6666666666666, + 499, + 651.3333333333333 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 108, + 651.3333333333333, + 499, + 710.9999999999999 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 104, + 720, + 496, + 733 + ], + "lines": [ + { + "bbox": [ + 105, + 716, + 493, + 736 + ], + "spans": [ + { + "bbox": [ + 105, + 716, + 477, + 736 + ], + "score": 1.0, + "content": "where the third equality holds due to Lemma 6 and Lemma 7, and (16) uses the definition of", + "type": "text" + }, + { + "bbox": [ + 477, + 723, + 493, + 733 + ], + "score": 0.89, + "content": "m _ { i j }", + "type": "inline_equation" + } + ], + "index": 26 + } + ], + "index": 26 + } + ], + "page_idx": 18, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 39 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 39 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 313, + 765 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 313, + 765 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 15, + "width": 14 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 80, + 505, + 117 + ], + "lines": [ + { + "bbox": [ + 104, + 78, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 104, + 78, + 174, + 96 + ], + "score": 1.0, + "content": "Lemma 10. Let", + "type": "text" + }, + { + "bbox": [ + 175, + 83, + 184, + 92 + ], + "score": 0.54, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 78, + 241, + 96 + ], + "score": 1.0, + "content": "be the unique", + "type": "text" + }, + { + "bbox": [ + 242, + 80, + 289, + 92 + ], + "score": 0.92, + "content": "\\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 290, + 78, + 372, + 96 + ], + "score": 1.0, + "content": "matrix that satisfies", + "type": "text" + }, + { + "bbox": [ + 373, + 82, + 459, + 95 + ], + "score": 0.91, + "content": "T \\nu e c ^ { * } ( u u ^ { \\top } ) = f ( u )", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 78, + 506, + 96 + ], + "score": 1.0, + "content": "(defined in", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 146, + 106 + ], + "score": 1.0, + "content": "Equation", + "type": "text" + }, + { + "bbox": [ + 146, + 94, + 157, + 104 + ], + "score": 0.58, + "content": "1 l", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 93, + 486, + 106 + ], + "score": 1.0, + "content": "), suppose the augmented distinguishing matrix is full rank, then the nullspace of", + "type": "text" + }, + { + "bbox": [ + 486, + 94, + 495, + 104 + ], + "score": 0.72, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 93, + 505, + 106 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 243, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 183, + 118 + ], + "score": 1.0, + "content": "exactly the span of", + "type": "text" + }, + { + "bbox": [ + 184, + 104, + 239, + 117 + ], + "score": 0.94, + "content": "\\{ \\nu e c ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 104, + 243, + 118 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1, + "bbox_fs": [ + 104, + 78, + 506, + 118 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 128, + 504, + 151 + ], + "lines": [ + { + "bbox": [ + 106, + 127, + 504, + 140 + ], + "spans": [ + { + "bbox": [ + 106, + 127, + 504, + 140 + ], + "score": 1.0, + "content": "Similar to Theorem 4, we provide the following theorem for the noisy case. The proof is almost the", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 139, + 409, + 151 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 409, + 151 + ], + "score": 1.0, + "content": "same as Theorem 4 by using the noisy version lemmas (Lemmas 9 and 10).", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5, + "bbox_fs": [ + 105, + 127, + 504, + 151 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 155, + 505, + 190 + ], + "lines": [ + { + "bbox": [ + 105, + 156, + 504, + 170 + ], + "spans": [ + { + "bbox": [ + 105, + 156, + 196, + 170 + ], + "score": 1.0, + "content": "Theorem 5. Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 156, + 255, + 169 + ], + "score": 0.91, + "content": "\\mathbb { E } [ x x ^ { \\top } ] , A , W", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 156, + 423, + 170 + ], + "score": 1.0, + "content": "and the augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 424, + 157, + 435, + 167 + ], + "score": 0.55, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 156, + 504, + 170 + ], + "score": 1.0, + "content": "are all full rank,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 168, + 505, + 180 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 505, + 180 + ], + "score": 1.0, + "content": "and Algorithm 3 has access to the exact moments, then the network returned by the algorithm com-", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 179, + 359, + 191 + ], + "spans": [ + { + "bbox": [ + 105, + 179, + 359, + 191 + ], + "score": 1.0, + "content": "putes exactly the same function as the original neural network.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6, + "bbox_fs": [ + 105, + 156, + 505, + 191 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 201, + 358, + 214 + ], + "lines": [ + { + "bbox": [ + 105, + 201, + 359, + 216 + ], + "spans": [ + { + "bbox": [ + 105, + 201, + 359, + 216 + ], + "score": 1.0, + "content": "Now, we only need to prove Lemma 9 to finish this noise case.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8, + "bbox_fs": [ + 105, + 201, + 359, + 216 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 224, + 505, + 258 + ], + "lines": [ + { + "bbox": [ + 105, + 223, + 505, + 237 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 505, + 237 + ], + "score": 1.0, + "content": "Proof of Lemma 9. Similar to (5) and (6), we deduce these three terms in RHS of (11) one by one", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 235, + 506, + 249 + ], + "spans": [ + { + "bbox": [ + 105, + 235, + 469, + 249 + ], + "score": 1.0, + "content": "as follows. For the first term, it is exactly the same as (5) since the expectation is linear wrt.", + "type": "text" + }, + { + "bbox": [ + 470, + 237, + 476, + 248 + ], + "score": 0.83, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 476, + 235, + 506, + 249 + ], + "score": 1.0, + "content": ". Thus,", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 246, + 142, + 258 + ], + "spans": [ + { + "bbox": [ + 106, + 246, + 142, + 258 + ], + "score": 1.0, + "content": "we have", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10, + "bbox_fs": [ + 105, + 223, + 506, + 258 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 114, + 266, + 496, + 316 + ], + "lines": [ + { + "bbox": [ + 114, + 266, + 496, + 316 + ], + "spans": [ + { + "bbox": [ + 114, + 266, + 496, + 316 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\ 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "616e7caa9ab5ce6b7a92a319b290cc41177862d6d5a1b5a70ea78356354707f9.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 114, + 266, + 496, + 282.6666666666667 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 114, + 282.6666666666667, + 496, + 299.33333333333337 + ], + "spans": [], + "index": 13 + }, + { + "bbox": [ + 114, + 299.33333333333337, + 496, + 316.00000000000006 + ], + "spans": [], + "index": 14 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 343, + 505, + 368 + ], + "lines": [ + { + "bbox": [ + 105, + 343, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 244, + 358 + ], + "score": 1.0, + "content": "Now, let’s look at the second term", + "type": "text" + }, + { + "bbox": [ + 245, + 344, + 321, + 357 + ], + "score": 0.92, + "content": "\\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ]", + "type": "inline_equation" + }, + { + "bbox": [ + 321, + 343, + 506, + 358 + ], + "score": 1.0, + "content": "which is slightly different from (6) due to the", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 355, + 451, + 368 + ], + "spans": [ + { + "bbox": [ + 106, + 355, + 130, + 368 + ], + "score": 1.0, + "content": "noise", + "type": "text" + }, + { + "bbox": [ + 130, + 356, + 136, + 367 + ], + "score": 0.83, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 355, + 451, + 368 + ], + "score": 1.0, + "content": ". Particularly, we add the third term to cancel this extra noise square term later.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 343, + 506, + 368 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 105, + 376, + 500, + 459 + ], + "lines": [ + { + "bbox": [ + 105, + 376, + 500, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 376, + 500, + 459 + ], + "score": 0.88, + "content": "\\begin{array} { r l } & { \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } ( A \\sigma ( W x ) + \\xi ) ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\mathbb { E } \\big [ ( u ^ { \\top } A \\sigma ( W x ) ) ^ { 2 } ( x \\otimes x ) \\big ] + \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { = \\frac { 1 } { 2 } \\displaystyle \\sum _ { 1 \\leq i \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i i } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ( x \\otimes x ) \\big ] + 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\end{array}", + "type": "interline_equation", + "image_path": "39442405ba6e04f091d79beaba8ccf54706237c6151f23829305430730d2ee26.jpg" + } + ] + } + ], + "index": 18, + "virtual_lines": [ + { + "bbox": [ + 105, + 376, + 500, + 403.6666666666667 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 105, + 403.6666666666667, + 500, + 431.33333333333337 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 105, + 431.33333333333337, + 500, + 459.00000000000006 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "interline_equation", + "bbox": [ + 117, + 470, + 207, + 487 + ], + "lines": [ + { + "bbox": [ + 117, + 470, + 207, + 487 + ], + "spans": [ + { + "bbox": [ + 117, + 470, + 207, + 487 + ], + "score": 0.63, + "content": "+ \\mathbb { E } \\left[ ( u ^ { \\top } \\xi ) ^ { 2 } ( x \\otimes x ) \\right] ,", + "type": "interline_equation", + "image_path": "d01a73e8a1194fd78c4845f53e552f35adca743a4d4e54b3d3c7effeea5bd42e.jpg" + } + ] + } + ], + "index": 20, + "virtual_lines": [ + { + "bbox": [ + 117, + 470, + 207, + 487 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 496, + 188, + 508 + ], + "lines": [ + { + "bbox": [ + 105, + 495, + 189, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 189, + 510 + ], + "score": 1.0, + "content": "where (15) uses (6).", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 495, + 189, + 510 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 513, + 217, + 525 + ], + "lines": [ + { + "bbox": [ + 105, + 512, + 217, + 526 + ], + "spans": [ + { + "bbox": [ + 105, + 512, + 217, + 526 + ], + "score": 1.0, + "content": "For the third term, we have", + "type": "text" + } + ], + "index": 22 + } + ], + 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} A ^ { \\top } u ^ { \\top } A \\rangle \\mathbb { E } [ ( w _ { i } ^ { \\top } x ) ^ { 2 } ] } \\\\ & { } & { \\overset { \\mathrm { ( 4 ) } } { = } + \\sum _ { 1 \\leq i \\leq i } \\sum _ { 1 \\leq i } ( A ^ { \\top } u w _ { i } ^ { \\top } A ) _ { i \\beta } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) z ( w _ { i } ^ { \\top } x ) ] - \\sum _ { 1 \\leq i \\leq i } ( A ^ { \\top } u u ^ { \\top } A ) _ { i \\beta } \\mathbb { E } [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ] } \\\\ & { } & { + \\frac { 1 } { 1 \\leq i \\leq i \\leq j \\leq k } } \\\\ & { } & { = + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] } \\\\ & { = - \\sum _ { 1 \\leq i \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } \\mathbb { B } [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ] \\{ ( w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 ) \\} + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] } \\\\ & { = - \\sum _ { 1 \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { i j } m _ { i i } + \\mathbb { E } [ ( u ^ { \\top } \\xi ) ^ { 2 } ] , } \\\\ & = - \\sum _ { 1 \\leq i \\leq j \\leq k } ( A ^ { \\top } u u ^ \\end{array}", + "type": "interline_equation", + "image_path": "40c7ff7f9d89e584e1979504b68c4781bde7d8ccf57295860e47962673dfaec2.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 108, + 532, + 499, + 591.6666666666666 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 108, + 591.6666666666666, + 499, + 651.3333333333333 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 108, + 651.3333333333333, + 499, + 710.9999999999999 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 104, + 720, + 496, + 733 + ], + "lines": [ + { + "bbox": [ + 105, + 716, + 493, + 736 + ], + "spans": [ + { + "bbox": [ + 105, + 716, + 477, + 736 + ], + "score": 1.0, + "content": "where the third equality holds due to Lemma 6 and Lemma 7, and (16) uses the definition of", + "type": "text" + }, + { + "bbox": [ + 477, + 723, + 493, + 733 + ], + "score": 0.89, + "content": "m _ { i j }", + "type": "inline_equation" + } + ], + "index": 26 + } + ], + "index": 26, + "bbox_fs": [ + 105, + 716, + 493, + 736 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 107, + 82, + 392, + 93 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 391, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 382, + 95 + ], + "score": 1.0, + "content": "Algorithm 4 Learning Two-layer Neural Networks with Non-square", + "type": "text" + }, + { + "bbox": [ + 383, + 83, + 391, + 92 + ], + "score": 0.59, + "content": "A", + "type": "inline_equation" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 109, + 95, + 492, + 172 + ], + "lines": [ + { + "bbox": [ + 108, + 95, + 410, + 109 + ], + "spans": [ + { + "bbox": [ + 108, + 95, + 178, + 109 + ], + "score": 1.0, + "content": "Input: Samples", + "type": "text" + }, + { + "bbox": [ + 178, + 96, + 261, + 108 + ], + "score": 0.89, + "content": "( x _ { 1 } , y _ { 1 } ) , . . . , ( x _ { n } , y _ { n } )", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 95, + 410, + 109 + ], + "score": 1.0, + "content": "generated according to Equation (2).", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 108, + 106, + 316, + 118 + ], + "spans": [ + { + "bbox": [ + 108, + 106, + 215, + 118 + ], + "score": 1.0, + "content": "Output: Weight matrices", + "type": "text" + }, + { + "bbox": [ + 216, + 108, + 262, + 118 + ], + "score": 0.86, + "content": "W \\in \\mathbb { R } ^ { k \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 263, + 106, + 280, + 118 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 281, + 106, + 312, + 118 + ], + "score": 0.91, + "content": "A \\in ^ { l \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 106, + 316, + 118 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 107, + 115, + 442, + 138 + ], + "spans": [ + { + "bbox": [ + 107, + 115, + 221, + 138 + ], + "score": 1.0, + "content": "1: Using half samples (i.e.", + "type": "text" + }, + { + "bbox": [ + 221, + 118, + 279, + 133 + ], + "score": 0.93, + "content": "\\{ ( x _ { i } , y _ { i } ) \\} _ { i = 1 } ^ { n / 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 115, + 404, + 138 + ], + "score": 1.0, + "content": "to estimate empirical moments", + "type": "text" + }, + { + "bbox": [ + 405, + 119, + 435, + 133 + ], + "score": 0.91, + "content": "\\hat { \\mathbb { E } } [ y x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 115, + 442, + 138 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 110, + 132, + 427, + 146 + ], + "spans": [ + { + "bbox": [ + 110, + 133, + 139, + 146 + ], + "score": 1.0, + "content": "2: Let", + "type": "text" + }, 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Let the output of Algorithm 3 be", + "type": "text" + }, + { + "bbox": [ + 456, + 144, + 485, + 156 + ], + "score": 0.92, + "content": "V , Z ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 142, + 490, + 160 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 109, + 158, + 199, + 171 + ], + "spans": [ + { + "bbox": [ + 109, + 159, + 155, + 170 + ], + "score": 1.0, + "content": "4: return", + "type": "text" + }, + { + "bbox": [ + 155, + 158, + 196, + 171 + ], + "score": 0.81, + "content": "V , P Z ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 159, + 199, + 170 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 3.5 + }, + { + "type": "text", + "bbox": [ + 106, + 194, + 339, + 206 + ], + "lines": [ + { + "bbox": [ + 106, + 194, + 340, + 208 + ], + "spans": [ + { + "bbox": [ + 106, + 194, + 340, + 208 + ], + "score": 1.0, + "content": "Finally, we combine these three terms (13–16) as follows:", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7 + }, + { + "type": "interline_equation", + "bbox": [ + 113, + 210, + 494, + 367 + ], + "lines": [ + { + "bbox": [ + 113, + 210, + 494, + 367 + ], + "spans": [ + { + "bbox": [ + 113, + 210, + 494, + 367 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { f ( u ) = 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { \\qquad + \\left( \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ \\mathbb { x } x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\right) \\mathbb { E } [ x \\otimes x ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } \\big ( A ^ { \\top } u u ^ { \\top } A _ { j \\downarrow } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { \\qquad - 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A _ { j \\downarrow } ) \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } \\big ] \\mathbb { E } \\big [ x \\otimes x \\big ] } \\\\ & { \\qquad + \\left( - \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { j j } m _ { s j } + \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } \\big ] \\right) \\mathbb { E } \\big [ x \\otimes x \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { j j } N _ { i j } - \\Big ( \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ^ { \\top } A ) _ { i j } m _ { i j } \\Big ) \\mathbb { E } [ x \\otimes x ] , } \\end{array}", + "type": "interline_equation", + "image_path": "a292281720bf57475cb114825d5b5987e1c25fbd63f5a804048cf28cd71bf2f6.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 113, + 210, + 494, + 262.3333333333333 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 113, + 262.3333333333333, + 494, + 314.66666666666663 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 113, + 314.66666666666663, + 494, + 366.99999999999994 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 372, + 243, + 383 + ], + "lines": [ + { + "bbox": [ + 105, + 370, + 243, + 386 + ], + "spans": [ + { + "bbox": [ + 105, + 370, + 243, + 386 + ], + "score": 1.0, + "content": "where (17) uses (9) (same as (7)).", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "title", + "bbox": [ + 108, + 397, + 269, + 408 + ], + "lines": [ + { + "bbox": [ + 106, + 397, + 270, + 410 + ], + "spans": [ + { + "bbox": [ + 106, + 397, + 260, + 410 + ], + "score": 1.0, + "content": "A.3 EXTENSION TO NON-SQUARE", + "type": "text" + }, + { + "bbox": [ + 261, + 398, + 270, + 407 + ], + "score": 0.41, + "content": "A", + "type": "inline_equation" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 505, + 473 + ], + "lines": [ + { + "bbox": [ + 106, + 417, + 506, + 429 + ], + "spans": [ + { + "bbox": [ + 106, + 417, + 506, + 429 + ], + "score": 1.0, + "content": "In this paper, for simplicity, we have assumed that the dimension of output equals the number of", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 428, + 505, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 194, + 441 + ], + "score": 1.0, + "content": "hidden units and thus", + "type": "text" + }, + { + "bbox": [ + 194, + 429, + 203, + 439 + ], + "score": 0.78, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 428, + 220, + 441 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 221, + 429, + 245, + 439 + ], + "score": 0.91, + "content": "k \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 428, + 505, + 441 + ], + "score": 1.0, + "content": "square matrix. Actually, our algorithm can be easily extended to", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "score": 1.0, + "content": "the case where the dimension of output is at least the number of hidden units. In this section, we give", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 450, + 506, + 463 + ], + "spans": [ + { + "bbox": [ + 105, + 450, + 374, + 463 + ], + "score": 1.0, + "content": "an algorithm for this general case, by reducing it to the case where", + "type": "text" + }, + { + "bbox": [ + 374, + 451, + 383, + 460 + ], + "score": 0.77, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 450, + 506, + 463 + ], + "score": 1.0, + "content": "is square. The pseudo-code is", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 462, + 196, + 474 + ], + "spans": [ + { + "bbox": [ + 105, + 462, + 196, + 474 + ], + "score": 1.0, + "content": "given in Algorithm 4.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 106, + 475, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 106, + 476, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 476, + 197, + 490 + ], + "score": 1.0, + "content": "Theorem 6. Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 476, + 254, + 489 + ], + "score": 0.88, + "content": "\\mathbb { E } [ x x ^ { \\top } ] , W , A", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 476, + 423, + 490 + ], + "score": 1.0, + "content": "and the augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 423, + 477, + 435, + 487 + ], + "score": 0.63, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 476, + 505, + 490 + ], + "score": 1.0, + "content": "are all full rank,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 488, + 505, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 167, + 500 + ], + "score": 1.0, + "content": "and Algorithm", + "type": "text" + }, + { + "bbox": [ + 167, + 488, + 174, + 497 + ], + "score": 0.3, + "content": "^ { 4 }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 488, + 505, + 500 + ], + "score": 1.0, + "content": "has access to the exact moments, then the network returned by the algorithm com-", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 499, + 359, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 359, + 511 + ], + "score": 1.0, + "content": "putes exactly the same function as the original neural network.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19 + }, + { + "type": "text", + "bbox": [ + 106, + 522, + 505, + 581 + ], + "lines": [ + { + "bbox": [ + 104, + 520, + 506, + 536 + ], + "spans": [ + { + "bbox": [ + 104, + 520, + 275, + 536 + ], + "score": 1.0, + "content": "Proof. Let the ground truth parameters be", + "type": "text" + }, + { + "bbox": [ + 275, + 522, + 317, + 533 + ], + "score": 0.94, + "content": "A \\in \\mathbb { R } ^ { l \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 520, + 334, + 536 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 334, + 522, + 381, + 533 + ], + "score": 0.92, + "content": "W \\in \\mathbb { R } ^ { k \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 520, + 506, + 536 + ], + "score": 1.0, + "content": ". The samples are generated by", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 107, + 533, + 505, + 547 + ], + "spans": [ + { + "bbox": [ + 107, + 534, + 179, + 546 + ], + "score": 0.92, + "content": "y = A \\sigma ( W x ) + \\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 533, + 245, + 547 + ], + "score": 1.0, + "content": ", where the noise", + "type": "text" + }, + { + "bbox": [ + 246, + 535, + 252, + 546 + ], + "score": 0.84, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 533, + 355, + 547 + ], + "score": 1.0, + "content": "is independent with input", + "type": "text" + }, + { + "bbox": [ + 355, + 536, + 362, + 544 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 533, + 402, + 547 + ], + "score": 1.0, + "content": ". We have", + "type": "text" + }, + { + "bbox": [ + 402, + 533, + 501, + 547 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\mathbb E [ y \\dot { { x } } ^ { \\top } ] = \\frac 1 2 \\mathbf { \\bar { A } } W \\mathbb E [ { { x } } { { x } } ^ { \\top } ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 533, + 505, + 547 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 546, + 505, + 559 + ], + "spans": [ + { + "bbox": [ + 106, + 547, + 150, + 559 + ], + "score": 1.0, + "content": "Since both", + "type": "text" + }, + { + "bbox": [ + 151, + 547, + 163, + 557 + ], + "score": 0.74, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 547, + 180, + 559 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 180, + 546, + 211, + 559 + ], + "score": 0.93, + "content": "\\mathbb { E } [ x x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 212, + 547, + 381, + 559 + ], + "score": 1.0, + "content": "are full-rank, we know the column span of", + "type": "text" + }, + { + "bbox": [ + 381, + 546, + 412, + 559 + ], + "score": 0.93, + "content": "\\mathbb { E } [ y x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 547, + 505, + 559 + ], + "score": 1.0, + "content": "are exactly the column", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 558, + 505, + 570 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 139, + 570 + ], + "score": 1.0, + "content": "span of", + "type": "text" + }, + { + "bbox": [ + 140, + 559, + 148, + 568 + ], + "score": 0.81, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 148, + 558, + 313, + 570 + ], + "score": 1.0, + "content": ". 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According to Theorem 5, we know for any input", + "type": "text" + }, + { + "bbox": [ + 393, + 599, + 400, + 607 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 596, + 444, + 609 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 444, + 596, + 505, + 609 + ], + "score": 0.92, + "content": "Z ^ { - 1 } \\sigma ( { \\bar { V } } x ) =", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 606, + 225, + 621 + ], + "spans": [ + { + "bbox": [ + 107, + 607, + 160, + 620 + ], + "score": 0.91, + "content": "\\mathbf { \\dot { \\nabla } } P ^ { \\top } A \\sigma ( \\dot { W } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 606, + 225, + 621 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 27 + }, + { + "type": "interline_equation", + "bbox": [ + 214, + 624, + 396, + 640 + ], + "lines": [ + { + "bbox": [ + 214, + 624, + 396, + 640 + ], + "spans": [ + { + "bbox": [ + 214, + 624, + 396, + 640 + ], + "score": 0.93, + "content": "P Z ^ { - 1 } \\sigma ( V x ) = P P ^ { \\top } A \\sigma ( W x ) = A \\sigma ( W x ) ,", + "type": "interline_equation", + "image_path": "09abfb133cd55214e4eb5ec9e904786820482ab562684042e4712b63da011a3e.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 214, + 624, + 396, + 640 + ], + "spans": [], + "index": 29 + } + ] + }, + { + "type": "text", + "bbox": [ + 103, + 644, + 504, + 668 + ], + "lines": [ + { + "bbox": [ + 105, + 643, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 643, + 267, + 658 + ], + "score": 1.0, + "content": "where the second equality holds since", + "type": "text" + }, + { + "bbox": [ + 267, + 644, + 290, + 656 + ], + 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Let the output of Algorithm 3 be", + "type": "text" + }, + { + "bbox": [ + 456, + 144, + 485, + 156 + ], + "score": 0.92, + "content": "V , Z ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 142, + 490, + 160 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 5, + "is_list_start_line": true, + "is_list_end_line": true + }, + { + "bbox": [ + 109, + 158, + 199, + 171 + ], + "spans": [ + { + "bbox": [ + 109, + 159, + 155, + 170 + ], + "score": 1.0, + "content": "4: return", + "type": "text" + }, + { + "bbox": [ + 155, + 158, + 196, + 171 + ], + "score": 0.81, + "content": "V , P Z ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 159, + 199, + 170 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6, + "is_list_start_line": true, + "is_list_end_line": true + } + ], + "index": 3.5, + "bbox_fs": [ + 107, + 95, + 490, + 171 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 194, + 339, + 206 + ], + "lines": [ + { + "bbox": [ + 106, + 194, + 340, + 208 + ], + "spans": [ + { + "bbox": [ + 106, + 194, + 340, + 208 + ], + "score": 1.0, + "content": "Finally, we combine these three terms (13–16) as follows:", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7, + "bbox_fs": [ + 106, + 194, + 340, + 208 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 113, + 210, + 494, + 367 + ], + "lines": [ + { + "bbox": [ + 113, + 210, + 494, + 367 + ], + "spans": [ + { + "bbox": [ + 113, + 210, + 494, + 367 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { f ( u ) = 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { \\qquad + \\left( \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ \\mathbb { x } x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\right) \\mathbb { E } [ x \\otimes x ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } \\big ( A ^ { \\top } u u ^ { \\top } A _ { j \\downarrow } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] } \\\\ & { \\qquad - 2 \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A _ { j \\downarrow } ) \\mathbb { E } \\big [ \\sigma ( w _ { i } ^ { \\top } x ) \\sigma ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } \\big ] \\mathbb { E } \\big [ x \\otimes x \\big ] } \\\\ & { \\qquad + \\left( - \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { j j } m _ { s j } + \\mathbb { E } \\big [ ( u ^ { \\top } \\xi ) ^ { 2 } \\big ] \\right) \\mathbb { E } \\big [ x \\otimes x \\big ] } \\\\ & { = \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u u ^ { \\top } A ) _ { j j } N _ { i j } - \\Big ( \\displaystyle \\sum _ { 1 \\leq i < j \\leq k } ( A ^ { \\top } u ^ { \\top } A ) _ { i j } m _ { i j } \\Big ) \\mathbb { E } [ x \\otimes x ] , } \\end{array}", + "type": "interline_equation", + "image_path": "a292281720bf57475cb114825d5b5987e1c25fbd63f5a804048cf28cd71bf2f6.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 113, + 210, + 494, + 262.3333333333333 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 113, + 262.3333333333333, + 494, + 314.66666666666663 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 113, + 314.66666666666663, + 494, + 366.99999999999994 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 372, + 243, + 383 + ], + "lines": [ + { + "bbox": [ + 105, + 370, + 243, + 386 + ], + "spans": [ + { + "bbox": [ + 105, + 370, + 243, + 386 + ], + "score": 1.0, + "content": "where (17) uses (9) (same as (7)).", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11, + "bbox_fs": [ + 105, + 370, + 243, + 386 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 397, + 269, + 408 + ], + "lines": [ + { + "bbox": [ + 106, + 397, + 270, + 410 + ], + "spans": [ + { + "bbox": [ + 106, + 397, + 260, + 410 + ], + "score": 1.0, + "content": "A.3 EXTENSION TO NON-SQUARE", + "type": "text" + }, + { + "bbox": [ + 261, + 398, + 270, + 407 + ], + "score": 0.41, + "content": "A", + "type": "inline_equation" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 505, + 473 + ], + "lines": [ + { + "bbox": [ + 106, + 417, + 506, + 429 + ], + "spans": [ + { + "bbox": [ + 106, + 417, + 506, + 429 + ], + "score": 1.0, + "content": "In this paper, for simplicity, we have assumed that the dimension of output equals the number of", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 428, + 505, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 194, + 441 + ], + "score": 1.0, + "content": "hidden units and thus", + "type": "text" + }, + { + "bbox": [ + 194, + 429, + 203, + 439 + ], + "score": 0.78, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 428, + 220, + 441 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 221, + 429, + 245, + 439 + ], + "score": 0.91, + "content": "k \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 428, + 505, + 441 + ], + "score": 1.0, + "content": "square matrix. Actually, our algorithm can be easily extended to", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "score": 1.0, + "content": "the case where the dimension of output is at least the number of hidden units. In this section, we give", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 450, + 506, + 463 + ], + "spans": [ + { + "bbox": [ + 105, + 450, + 374, + 463 + ], + "score": 1.0, + "content": "an algorithm for this general case, by reducing it to the case where", + "type": "text" + }, + { + "bbox": [ + 374, + 451, + 383, + 460 + ], + "score": 0.77, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 450, + 506, + 463 + ], + "score": 1.0, + "content": "is square. The pseudo-code is", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 462, + 196, + 474 + ], + "spans": [ + { + "bbox": [ + 105, + 462, + 196, + 474 + ], + "score": 1.0, + "content": "given in Algorithm 4.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 15, + "bbox_fs": [ + 105, + 417, + 506, + 474 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 475, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 106, + 476, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 476, + 197, + 490 + ], + "score": 1.0, + "content": "Theorem 6. Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 476, + 254, + 489 + ], + "score": 0.88, + "content": "\\mathbb { E } [ x x ^ { \\top } ] , W , A", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 476, + 423, + 490 + ], + "score": 1.0, + "content": "and the augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 423, + 477, + 435, + 487 + ], + "score": 0.63, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 476, + 505, + 490 + ], + "score": 1.0, + "content": "are all full rank,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 488, + 505, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 167, + 500 + ], + "score": 1.0, + "content": "and Algorithm", + "type": "text" + }, + { + "bbox": [ + 167, + 488, + 174, + 497 + ], + "score": 0.3, + "content": "^ { 4 }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 488, + 505, + 500 + ], + "score": 1.0, + "content": "has access to the exact moments, then the network returned by the algorithm com-", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 499, + 359, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 359, + 511 + ], + "score": 1.0, + "content": "putes exactly the same function as the original neural network.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19, + "bbox_fs": [ + 105, + 476, + 505, + 511 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 522, + 505, + 581 + ], + "lines": [ + { + "bbox": [ + 104, + 520, + 506, + 536 + ], + "spans": [ + { + "bbox": [ + 104, + 520, + 275, + 536 + ], + "score": 1.0, + "content": "Proof. Let the ground truth parameters be", + "type": "text" + }, + { + "bbox": [ + 275, + 522, + 317, + 533 + ], + "score": 0.94, + "content": "A \\in \\mathbb { R } ^ { l \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 520, + 334, + 536 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 334, + 522, + 381, + 533 + ], + "score": 0.92, + "content": "W \\in \\mathbb { R } ^ { k \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 520, + 506, + 536 + ], + "score": 1.0, + "content": ". The samples are generated by", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 107, + 533, + 505, + 547 + ], + "spans": [ + { + "bbox": [ + 107, + 534, + 179, + 546 + ], + "score": 0.92, + "content": "y = A \\sigma ( W x ) + \\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 533, + 245, + 547 + ], + "score": 1.0, + "content": ", where the noise", + "type": "text" + }, + { + "bbox": [ + 246, + 535, + 252, + 546 + ], + "score": 0.84, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 533, + 355, + 547 + ], + "score": 1.0, + "content": "is independent with input", + "type": "text" + }, + { + "bbox": [ + 355, + 536, + 362, + 544 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 533, + 402, + 547 + ], + "score": 1.0, + "content": ". We have", + "type": "text" + }, + { + "bbox": [ + 402, + 533, + 501, + 547 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\mathbb E [ y \\dot { { x } } ^ { \\top } ] = \\frac 1 2 \\mathbf { \\bar { A } } W \\mathbb E [ { { x } } { { x } } ^ { \\top } ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 533, + 505, + 547 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 546, + 505, + 559 + ], + "spans": [ + { + "bbox": [ + 106, + 547, + 150, + 559 + ], + "score": 1.0, + "content": "Since both", + "type": "text" + }, + { + "bbox": [ + 151, + 547, + 163, + 557 + ], + "score": 0.74, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 547, + 180, + 559 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 180, + 546, + 211, + 559 + ], + "score": 0.93, + "content": "\\mathbb { E } [ x x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 212, + 547, + 381, + 559 + ], + "score": 1.0, + "content": "are full-rank, we know the column span of", + "type": "text" + }, + { + "bbox": [ + 381, + 546, + 412, + 559 + ], + "score": 0.93, + "content": "\\mathbb { E } [ y x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 547, + 505, + 559 + ], + "score": 1.0, + "content": "are exactly the column", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 558, + 505, + 570 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 139, + 570 + ], + "score": 1.0, + "content": "span of", + "type": "text" + }, + { + "bbox": [ + 140, + 559, + 148, + 568 + ], + "score": 0.81, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 148, + 558, + 313, + 570 + ], + "score": 1.0, + "content": ". Furthermore, we know the columns of", + "type": "text" + }, + { + "bbox": [ + 313, + 559, + 322, + 568 + ], + "score": 0.85, + "content": "P", + "type": "inline_equation" + }, + { + "bbox": [ + 323, + 558, + 505, + 570 + ], + "score": 1.0, + "content": "is a set of orthonormal basis for the column", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 569, + 151, + 580 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 138, + 580 + ], + "score": 1.0, + "content": "span of", + "type": "text" + }, + { + "bbox": [ + 138, + 569, + 146, + 578 + ], + "score": 0.82, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 569, + 151, + 580 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23, + "bbox_fs": [ + 104, + 520, + 506, + 580 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 585, + 505, + 619 + ], + "lines": [ + { + "bbox": [ + 105, + 585, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 338, + 598 + ], + "score": 1.0, + "content": "For a ground truth neural network with weight matrices", + "type": "text" + }, + { + "bbox": [ + 338, + 586, + 350, + 596 + ], + "score": 0.71, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 585, + 370, + 598 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 370, + 585, + 393, + 596 + ], + "score": 0.9, + "content": "P ^ { \\top } A", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 585, + 505, + 598 + ], + "score": 1.0, + "content": ", the generated sample will", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 596, + 505, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 138, + 609 + ], + "score": 1.0, + "content": "just be", + "type": "text" + }, + { + "bbox": [ + 138, + 596, + 176, + 609 + ], + "score": 0.91, + "content": "( x , P ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 177, + 596, + 393, + 609 + ], + "score": 1.0, + "content": ". According to Theorem 5, we know for any input", + "type": "text" + }, + { + "bbox": [ + 393, + 599, + 400, + 607 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 596, + 444, + 609 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 444, + 596, + 505, + 609 + ], + "score": 0.92, + "content": "Z ^ { - 1 } \\sigma ( { \\bar { V } } x ) =", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 606, + 225, + 621 + ], + "spans": [ + { + "bbox": [ + 107, + 607, + 160, + 620 + ], + "score": 0.91, + "content": "\\mathbf { \\dot { \\nabla } } P ^ { \\top } A \\sigma ( \\dot { W } x )", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 606, + 225, + 621 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 27, + "bbox_fs": [ + 105, + 585, + 505, + 621 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 214, + 624, + 396, + 640 + ], + "lines": [ + { + "bbox": [ + 214, + 624, + 396, + 640 + ], + "spans": [ + { + "bbox": [ + 214, + 624, + 396, + 640 + ], + "score": 0.93, + "content": "P Z ^ { - 1 } \\sigma ( V x ) = P P ^ { \\top } A \\sigma ( W x ) = A \\sigma ( W x ) ,", + "type": "interline_equation", + "image_path": "09abfb133cd55214e4eb5ec9e904786820482ab562684042e4712b63da011a3e.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 214, + 624, + 396, + 640 + ], + "spans": [], + "index": 29 + } + ] + }, + { + "type": "text", + "bbox": [ + 103, + 644, + 504, + 668 + ], + "lines": [ + { + "bbox": [ + 105, + 643, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 643, + 267, + 658 + ], + "score": 1.0, + "content": "where the second equality holds since", + "type": "text" + }, + { + "bbox": [ + 267, + 644, + 290, + 656 + ], + "score": 0.89, + "content": "P P ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 291, + 643, + 506, + 658 + ], + "score": 1.0, + "content": "is just the projection matrix to the column span of", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 656, + 504, + 669 + ], + "spans": [ + { + "bbox": [ + 107, + 657, + 115, + 667 + ], + "score": 0.74, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 115, + 656, + 120, + 669 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 495, + 658, + 504, + 666 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30.5, + "bbox_fs": [ + 105, + 643, + 506, + 669 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 684, + 314, + 698 + ], + "lines": [ + { + "bbox": [ + 105, + 684, + 315, + 699 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 315, + 699 + ], + "score": 1.0, + "content": "B ROBUSTNESS OF MAIN ALGORITHM", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 32 + }, + { + "type": "text", + "bbox": [ + 106, + 709, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "In this section we will show that even if we do not have access to the exact moments, as long as", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "the empirical moments are estimated with enough (polynomially many) samples, Algorithm 2 and", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33.5, + "bbox_fs": [ + 106, + 709, + 505, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 140 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "Algorithm 3 can still learn the parameters robustly. We will focus on Algorithm 3 as it is more", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 425, + 106 + ], + "score": 1.0, + "content": "general, the result for Algorithm 2 can be viewed as a corollary when the noise", + "type": "text" + }, + { + "bbox": [ + 426, + 94, + 451, + 105 + ], + "score": 0.91, + "content": "\\xi = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 93, + 505, + 106 + ], + "score": 1.0, + "content": ". Throughout", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 505, + 119 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 205, + 119 + ], + "score": 1.0, + "content": "this section, we will use", + "type": "text" + }, + { + "bbox": [ + 205, + 104, + 237, + 117 + ], + "score": 0.92, + "content": "\\bar { \\boldsymbol { V } } , \\hat { \\boldsymbol { Z } } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 104, + 505, + 119 + ], + "score": 1.0, + "content": "to denote the results of Algorithm 3 with empirical moments, and", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 505, + 130 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 123, + 130 + ], + "score": 1.0, + "content": "use", + "type": "text" + }, + { + "bbox": [ + 123, + 117, + 154, + 128 + ], + "score": 0.92, + "content": "V , Z ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 115, + 505, + 130 + ], + "score": 1.0, + "content": "for the results when the algorithm has access to exact moments, similarly for other", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 128, + 462, + 140 + ], + "spans": [ + { + "bbox": [ + 106, + 128, + 462, + 140 + ], + "score": 1.0, + "content": "intermediate results. For the robustness of Algorithm 3, we prove the following theorem.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2 + }, + { + "type": "text", + "bbox": [ + 106, + 142, + 505, + 203 + ], + "lines": [ + { + "bbox": [ + 106, + 142, + 505, + 155 + ], + "spans": [ + { + "bbox": [ + 106, + 142, + 264, + 155 + ], + "score": 1.0, + "content": "Theorem 7. Assume that the norms of", + "type": "text" + }, + { + "bbox": [ + 264, + 143, + 293, + 154 + ], + "score": 0.91, + "content": "x , \\xi , A", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 142, + 359, + 155 + ], + "score": 1.0, + "content": "are bounded by", + "type": "text" + }, + { + "bbox": [ + 359, + 142, + 487, + 155 + ], + "score": 0.84, + "content": "\\| x \\| \\leq \\Gamma , \\| \\xi \\| \\leq P _ { 2 } , \\| A \\| \\leq P _ { 1 } ,", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 142, + 505, + 155 + ], + "score": 1.0, + "content": ", the", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 153, + 506, + 167 + ], + "spans": [ + { + "bbox": [ + 104, + 153, + 363, + 167 + ], + "score": 1.0, + "content": "covariance matrix and the weight matrix are robustly full rank:", + "type": "text" + }, + { + "bbox": [ + 364, + 154, + 500, + 166 + ], + "score": 0.8, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 500, + 153, + 506, + 167 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 164, + 505, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 164, + 454, + 178 + ], + "score": 1.0, + "content": "Further assume that the augmented distinguishing matrix has smallest singular values", + "type": "text" + }, + { + "bbox": [ + 454, + 165, + 505, + 177 + ], + "score": 0.87, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ) \\geq", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 176, + 505, + 190 + ], + "spans": [ + { + "bbox": [ + 106, + 179, + 114, + 187 + ], + "score": 0.56, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 176, + 246, + 190 + ], + "score": 1.0, + "content": ". For any small enough \u000f, for any", + "type": "text" + }, + { + "bbox": [ + 246, + 177, + 270, + 188 + ], + "score": 0.89, + "content": "\\delta < 1", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 176, + 315, + 190 + ], + "score": 1.0, + "content": ", given poly", + "type": "text" + }, + { + "bbox": [ + 316, + 176, + 470, + 189 + ], + "score": 0.88, + "content": "\\left( \\Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \\epsilon , 1 / \\gamma , 1 / \\alpha , 1 / \\beta , 1 / \\delta \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 176, + 505, + 190 + ], + "score": 1.0, + "content": "number", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 189, + 501, + 204 + ], + "spans": [ + { + "bbox": [ + 105, + 189, + 302, + 204 + ], + "score": 1.0, + "content": "of i.i.d. samples, let the output of Algorithm 3 be", + "type": "text" + }, + { + "bbox": [ + 303, + 189, + 334, + 202 + ], + "score": 0.86, + "content": "\\hat { V } , \\hat { Z } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 189, + 473, + 204 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 473, + 191, + 496, + 201 + ], + "score": 0.8, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 496, + 189, + 501, + 204 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 7 + }, + { + "type": "interline_equation", + "bbox": [ + 241, + 207, + 369, + 222 + ], + "lines": [ + { + "bbox": [ + 241, + 207, + 369, + 222 + ], + "spans": [ + { + "bbox": [ + 241, + 207, + 369, + 222 + ], + "score": 0.89, + "content": "\\| A \\sigma ( W x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\| \\le \\epsilon ,", + "type": "interline_equation", + "image_path": "bb6326c2231dac68813e7ef1a4d439b5b2dfd4fc41b4f99251db7488f7f3dcc8.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 241, + 207, + 369, + 222 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 228, + 169, + 239 + ], + "lines": [ + { + "bbox": [ + 104, + 227, + 167, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 227, + 160, + 240 + ], + "score": 1.0, + "content": "for any input", + "type": "text" + }, + { + "bbox": [ + 161, + 230, + 167, + 237 + ], + "score": 0.5, + "content": "x", + "type": "inline_equation" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 248, + 505, + 294 + ], + "lines": [ + { + "bbox": [ + 105, + 248, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 248, + 505, + 261 + ], + "score": 1.0, + "content": "In order to prove the above Theorem, we need to show that each step of Algorithm 3 is robust. We", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 259, + 505, + 273 + ], + "spans": [ + { + "bbox": [ + 105, + 259, + 343, + 273 + ], + "score": 1.0, + "content": "can divide Algorithm 3 into three steps: finding the span of", + "type": "text" + }, + { + "bbox": [ + 343, + 259, + 391, + 272 + ], + "score": 0.86, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) ^ { \\cdot }", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 259, + 430, + 273 + ], + "score": 1.0, + "content": "’s; finding", + "type": "text" + }, + { + "bbox": [ + 431, + 261, + 440, + 271 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 259, + 505, + 273 + ], + "score": 1.0, + "content": "’s from the span", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 271, + 505, + 284 + ], + "spans": [ + { + "bbox": [ + 106, + 271, + 118, + 284 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 271, + 165, + 284 + ], + "score": 0.89, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 271, + 505, + 284 + ], + "score": 1.0, + "content": "’s; recovering first layer using Algorithm 1. We will first state the key lemmas that", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 283, + 460, + 295 + ], + "spans": [ + { + "bbox": [ + 105, + 283, + 460, + 295 + ], + "score": 1.0, + "content": "prove every step is robust to noise, and finally combine them to show our main theorem.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5 + }, + { + "type": "text", + "bbox": [ + 106, + 299, + 505, + 380 + ], + "lines": [ + { + "bbox": [ + 105, + 299, + 506, + 312 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 506, + 312 + ], + "score": 1.0, + "content": "First, we show that with polynomial number of samples, we can approximate the span of", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 311, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 106, + 311, + 153, + 324 + ], + "score": 0.91, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 311, + 270, + 326 + ], + "score": 1.0, + "content": "’s in arbitrary accuracy. Let", + "type": "text" + }, + { + "bbox": [ + 270, + 311, + 279, + 322 + ], + "score": 0.85, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 311, + 397, + 326 + ], + "score": 1.0, + "content": "be the empirical estimate of", + "type": "text" + }, + { + "bbox": [ + 398, + 312, + 406, + 322 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 311, + 506, + 326 + ], + "score": 1.0, + "content": ", which is the pure neu-", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 323, + 505, + 334 + ], + "spans": [ + { + "bbox": [ + 106, + 323, + 484, + 334 + ], + "score": 1.0, + "content": "ron detector matrix as defined in Algorithm 3. As shown in Lemma 10, the null space of", + "type": "text" + }, + { + "bbox": [ + 485, + 324, + 494, + 333 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 323, + 505, + 334 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 333, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 185, + 347 + ], + "score": 1.0, + "content": "exactly the span of", + "type": "text" + }, + { + "bbox": [ + 186, + 333, + 232, + 346 + ], + "score": 0.89, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 334, + 505, + 347 + ], + "score": 1.0, + "content": "’s. We use standard matrix perturbation theory (see Section D.2) to", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 345, + 505, + 357 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 219, + 357 + ], + "score": 1.0, + "content": "show that the null space of", + "type": "text" + }, + { + "bbox": [ + 220, + 346, + 228, + 355 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 345, + 505, + 357 + ], + "score": 1.0, + "content": "is robust to small perturbations. More precisely, in Lemma 11, we", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 356, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 357, + 345, + 370 + ], + "score": 1.0, + "content": "show that with polynomial number of samples, the span of", + "type": "text" + }, + { + "bbox": [ + 345, + 358, + 352, + 367 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 357, + 452, + 370 + ], + "score": 1.0, + "content": "least singular vectors of", + "type": "text" + }, + { + "bbox": [ + 452, + 356, + 461, + 367 + ], + "score": 0.85, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 357, + 506, + 370 + ], + "score": 1.0, + "content": "is close to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 367, + 187, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 174, + 380 + ], + "score": 1.0, + "content": "the null space of", + "type": "text" + }, + { + "bbox": [ + 175, + 369, + 183, + 378 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 367, + 187, + 380 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 19 + }, + { + "type": "text", + "bbox": [ + 106, + 383, + 505, + 437 + ], + "lines": [ + { + "bbox": [ + 104, + 381, + 506, + 397 + ], + "spans": [ + { + "bbox": [ + 104, + 381, + 358, + 397 + ], + "score": 1.0, + "content": "Lemma 11. Under the same assumptions as in Theorem 7, let", + "type": "text" + }, + { + "bbox": [ + 358, + 383, + 421, + 394 + ], + "score": 0.91, + "content": "S \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 381, + 506, + 397 + ], + "score": 1.0, + "content": "be the matrix whose", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 393, + 507, + 411 + ], + "spans": [ + { + "bbox": [ + 106, + 397, + 113, + 407 + ], + "score": 0.57, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 393, + 180, + 411 + ], + "score": 1.0, + "content": "columns are the", + "type": "text" + }, + { + "bbox": [ + 180, + 398, + 187, + 407 + ], + "score": 0.54, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 393, + 308, + 411 + ], + "score": 1.0, + "content": "least right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 308, + 397, + 316, + 407 + ], + "score": 0.66, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 393, + 385, + 411 + ], + "score": 1.0, + "content": ". Similarly define √", + "type": "text" + }, + { + "bbox": [ + 386, + 395, + 449, + 407 + ], + "score": 0.9, + "content": "\\hat { S } \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 449, + 393, + 507, + 411 + ], + "score": 1.0, + "content": "for empirical", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 102, + 402, + 509, + 429 + ], + "spans": [ + { + "bbox": [ + 102, + 402, + 142, + 429 + ], + "score": 1.0, + "content": "estimate", + "type": "text" + }, + { + "bbox": [ + 142, + 410, + 151, + 422 + ], + "score": 0.81, + "content": "\\hat { T } .", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 402, + 207, + 429 + ], + "score": 1.0, + "content": ". Then for any", + "type": "text" + }, + { + "bbox": [ + 208, + 412, + 242, + 424 + ], + "score": 0.91, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 242, + 402, + 275, + 429 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 276, + 412, + 300, + 423 + ], + "score": 0.9, + "content": "\\delta < 1", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 402, + 327, + 429 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 328, + 408, + 438, + 426 + ], + "score": 0.91, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } . } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 402, + 509, + 429 + ], + "score": 1.0, + "content": ") number of i.i.d.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 424, + 305, + 437 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 278, + 437 + ], + "score": 1.0, + "content": "samples, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 278, + 425, + 301, + 435 + ], + "score": 0.78, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 424, + 305, + 437 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5 + }, + { + "type": "interline_equation", + "bbox": [ + 255, + 441, + 356, + 469 + ], + "lines": [ + { + "bbox": [ + 255, + 441, + 356, + 469 + ], + "spans": [ + { + "bbox": [ + 255, + 441, + 356, + 469 + ], + "score": 0.93, + "content": "\\lVert S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\rVert \\leq \\frac { \\sqrt { 2 } \\epsilon } { \\alpha \\beta ^ { 2 } } .", + "type": "interline_equation", + "image_path": "49c1e43446cfaa1659dc197db3d59ca3da99857ec357ab0642e8b2723ef52cd9.jpg" + } + ] + } + ], + "index": 27.5, + "virtual_lines": [ + { + "bbox": [ + 255, + 441, + 356, + 455.0 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 255, + 455.0, + 356, + 469.0 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 479, + 505, + 525 + ], + "lines": [ + { + "bbox": [ + 106, + 480, + 505, + 492 + ], + "spans": [ + { + "bbox": [ + 106, + 480, + 505, + 492 + ], + "score": 1.0, + "content": "The proof of the above lemma is in Section B.1. Basically, we need to lowerbound the spectral", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 104, + 490, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 104, + 491, + 127, + 505 + ], + "score": 1.0, + "content": "gap (", + "type": "text" + }, + { + "bbox": [ + 127, + 492, + 138, + 504 + ], + "score": 0.84, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 491, + 221, + 505 + ], + "score": 1.0, + "content": "-th singular value of", + "type": "text" + }, + { + "bbox": [ + 221, + 493, + 229, + 502 + ], + "score": 0.72, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 491, + 405, + 505 + ], + "score": 1.0, + "content": ") and to upperbound the Frobenius norm of", + "type": "text" + }, + { + "bbox": [ + 405, + 490, + 433, + 503 + ], + "score": 0.92, + "content": "T - { \\hat { T } }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 491, + 506, + 505 + ], + "score": 1.0, + "content": ". Standard matrix", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 503, + 505, + 516 + ], + "spans": [ + { + "bbox": [ + 105, + 503, + 505, + 516 + ], + "score": 1.0, + "content": "perturbation bound shows that if the perturbation is much smaller than the spectral gap, then the null", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 515, + 183, + 526 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 183, + 526 + ], + "score": 1.0, + "content": "space is preserved.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30.5 + }, + { + "type": "text", + "bbox": [ + 106, + 530, + 505, + 575 + ], + "lines": [ + { + "bbox": [ + 104, + 529, + 506, + 545 + ], + "spans": [ + { + "bbox": [ + 104, + 529, + 271, + 545 + ], + "score": 1.0, + "content": "Next, we show that we can robustly find", + "type": "text" + }, + { + "bbox": [ + 272, + 532, + 281, + 542 + ], + "score": 0.82, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 529, + 359, + 545 + ], + "score": 1.0, + "content": "’s from the span of", + "type": "text" + }, + { + "bbox": [ + 359, + 530, + 406, + 543 + ], + "score": 0.91, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 529, + 506, + 545 + ], + "score": 1.0, + "content": "’s. Since this step of the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 542, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 542, + 505, + 554 + ], + "score": 1.0, + "content": "algorithm is the same as the simultaneous diagonalization algorithm for tensor decompositions, we", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 553, + 505, + 564 + ], + "spans": [ + { + "bbox": [ + 105, + 553, + 505, + 564 + ], + "score": 1.0, + "content": "use the robustness of simultaneous diagonalization (Bhaskara et al., 2014) to show that we can find", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 564, + 308, + 576 + ], + "spans": [ + { + "bbox": [ + 106, + 565, + 115, + 575 + ], + "score": 0.83, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 564, + 308, + 576 + ], + "score": 1.0, + "content": "’s robustly. The detailed proof is in Section B.2.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 34.5 + }, + { + "type": "text", + "bbox": [ + 106, + 578, + 505, + 654 + ], + "lines": [ + { + "bbox": [ + 104, + 576, + 504, + 595 + ], + "spans": [ + { + "bbox": [ + 104, + 576, + 221, + 595 + ], + "score": 1.0, + "content": "Lemma 12. Suppose that", + "type": "text" + }, + { + "bbox": [ + 222, + 578, + 504, + 592 + ], + "score": 0.86, + "content": "\\begin{array} { r c l } { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } & { \\leq } & { \\epsilon , \\| A \\| } \\\\ & { } & { \\geq } \\end{array} \\leq \\epsilon , \\| A \\| \\ \\leq \\ { P } _ { 1 } , \\| \\xi \\| \\ \\leq \\ P _ { 2 } , \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\ \\geq", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 591, + 506, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 593, + 181, + 605 + ], + "score": 0.9, + "content": "\\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 591, + 209, + 606 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 210, + 592, + 362, + 605 + ], + "score": 0.9, + "content": "\\hat { X } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 1 } ) , \\hat { Y } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 591, + 397, + 606 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 397, + 594, + 408, + 605 + ], + "score": 0.87, + "content": "\\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 591, + 431, + 606 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 431, + 594, + 441, + 605 + ], + "score": 0.86, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 591, + 506, + 606 + ], + "score": 1.0, + "content": "are two inde-", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 604, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 278, + 617 + ], + "score": 1.0, + "content": "pendent standard Gaussian vectors. Let", + "type": "text" + }, + { + "bbox": [ + 279, + 606, + 316, + 616 + ], + "score": 0.87, + "content": "z _ { 1 } , \\cdots z _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 604, + 461, + 617 + ], + "score": 1.0, + "content": "be the normalized row vectors of", + "type": "text" + }, + { + "bbox": [ + 462, + 604, + 480, + 615 + ], + "score": 0.89, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 480, + 604, + 506, + 617 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 615, + 506, + 629 + ], + "spans": [ + { + "bbox": [ + 106, + 617, + 143, + 628 + ], + "score": 0.89, + "content": "\\hat { z } _ { 1 } , . . . , \\hat { z } _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 616, + 237, + 629 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 237, + 615, + 266, + 628 + ], + "score": 0.9, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 616, + 371, + 629 + ], + "score": 1.0, + "content": "(after sign flip). For any", + "type": "text" + }, + { + "bbox": [ + 371, + 617, + 398, + 627 + ], + "score": 0.89, + "content": "\\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 616, + 475, + 629 + ], + "score": 1.0, + "content": "and small enough", + "type": "text" + }, + { + "bbox": [ + 475, + 618, + 481, + 627 + ], + "score": 0.39, + "content": "\\epsilon _ { \\mathrm { { \\mathrm { { } } } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 616, + 506, + 629 + ], + "score": 1.0, + "content": ", with", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 107, + 624, + 508, + 648 + ], + "spans": [ + { + "bbox": [ + 107, + 628, + 205, + 644 + ], + "score": 0.9, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 624, + 315, + 648 + ], + "score": 1.0, + "content": "number of i.i.d. samples in", + "type": "text" + }, + { + "bbox": [ + 316, + 630, + 345, + 644 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 346, + 624, + 447, + 648 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + }, + { + "bbox": [ + 447, + 632, + 469, + 642 + ], + "score": 0.8, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 624, + 508, + 648 + ], + "score": 1.0, + "content": "over the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 641, + 456, + 655 + ], + "spans": [ + { + "bbox": [ + 105, + 641, + 167, + 655 + ], + "score": 1.0, + "content": "randomness of", + "type": "text" + }, + { + "bbox": [ + 167, + 643, + 190, + 654 + ], + "score": 0.86, + "content": "\\zeta _ { 1 } , \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 641, + 373, + 655 + ], + "score": 1.0, + "content": "and i.i.d. samples, there exists a permutation", + "type": "text" + }, + { + "bbox": [ + 373, + 642, + 414, + 654 + ], + "score": 0.93, + "content": "\\pi ( i ) \\in [ \\dot { k } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 641, + 456, + 655 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 39.5 + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 659, + 384, + 673 + ], + "lines": [ + { + "bbox": [ + 225, + 659, + 384, + 673 + ], + "spans": [ + { + "bbox": [ + 225, + 659, + 384, + 673 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\| \\hat { z } _ { i } - z _ { \\pi [ i ] } \\| \\le p o l y ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) , } \\end{array}", + "type": "interline_equation", + "image_path": "479ebdc9be9eb6d30a3812a68559d3c0cc96846422cdd6be07f7c9d174e59a64.jpg" + } + ] + } + ], + "index": 43, + "virtual_lines": [ + { + "bbox": [ + 225, + 659, + 384, + 673 + ], + "spans": [], + "index": 43 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 677, + 181, + 690 + ], + "lines": [ + { + "bbox": [ + 104, + 677, + 179, + 691 + ], + "spans": [ + { + "bbox": [ + 104, + 677, + 137, + 691 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 138, + 678, + 179, + 689 + ], + "score": 0.89, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + } + ], + "index": 44 + } + ], + "index": 44 + }, + { + "type": "text", + "bbox": [ + 107, + 698, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 164, + 711 + ], + "score": 1.0, + "content": "Finally, given", + "type": "text" + }, + { + "bbox": [ + 164, + 699, + 174, + 710 + ], + "score": 0.86, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "’s, the problem reduces to a one-layer problem. We will first give an analysis for", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "Algorithm 1 as a warm-up. When we call Algorithm 1 from Algorithm 3, the situation is slightly", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "different. Note we reserve fresh samples for this step, so that the samples used by Algorithm 1 are", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 46 + } + ], + "page_idx": 20, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 310, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 14 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 140 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "Algorithm 3 can still learn the parameters robustly. We will focus on Algorithm 3 as it is more", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 425, + 106 + ], + "score": 1.0, + "content": "general, the result for Algorithm 2 can be viewed as a corollary when the noise", + "type": "text" + }, + { + "bbox": [ + 426, + 94, + 451, + 105 + ], + "score": 0.91, + "content": "\\xi = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 93, + 505, + 106 + ], + "score": 1.0, + "content": ". Throughout", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 505, + 119 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 205, + 119 + ], + "score": 1.0, + "content": "this section, we will use", + "type": "text" + }, + { + "bbox": [ + 205, + 104, + 237, + 117 + ], + "score": 0.92, + "content": "\\bar { \\boldsymbol { V } } , \\hat { \\boldsymbol { Z } } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 104, + 505, + 119 + ], + "score": 1.0, + "content": "to denote the results of Algorithm 3 with empirical moments, and", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 505, + 130 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 123, + 130 + ], + "score": 1.0, + "content": "use", + "type": "text" + }, + { + "bbox": [ + 123, + 117, + 154, + 128 + ], + "score": 0.92, + "content": "V , Z ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 115, + 505, + 130 + ], + "score": 1.0, + "content": "for the results when the algorithm has access to exact moments, similarly for other", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 128, + 462, + 140 + ], + "spans": [ + { + "bbox": [ + 106, + 128, + 462, + 140 + ], + "score": 1.0, + "content": "intermediate results. For the robustness of Algorithm 3, we prove the following theorem.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2, + "bbox_fs": [ + 105, + 82, + 505, + 140 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 142, + 505, + 203 + ], + "lines": [ + { + "bbox": [ + 106, + 142, + 505, + 155 + ], + "spans": [ + { + "bbox": [ + 106, + 142, + 264, + 155 + ], + "score": 1.0, + "content": "Theorem 7. Assume that the norms of", + "type": "text" + }, + { + "bbox": [ + 264, + 143, + 293, + 154 + ], + "score": 0.91, + "content": "x , \\xi , A", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 142, + 359, + 155 + ], + "score": 1.0, + "content": "are bounded by", + "type": "text" + }, + { + "bbox": [ + 359, + 142, + 487, + 155 + ], + "score": 0.84, + "content": "\\| x \\| \\leq \\Gamma , \\| \\xi \\| \\leq P _ { 2 } , \\| A \\| \\leq P _ { 1 } ,", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 142, + 505, + 155 + ], + "score": 1.0, + "content": ", the", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 153, + 506, + 167 + ], + "spans": [ + { + "bbox": [ + 104, + 153, + 363, + 167 + ], + "score": 1.0, + "content": "covariance matrix and the weight matrix are robustly full rank:", + "type": "text" + }, + { + "bbox": [ + 364, + 154, + 500, + 166 + ], + "score": 0.8, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 500, + 153, + 506, + 167 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 164, + 505, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 164, + 454, + 178 + ], + "score": 1.0, + "content": "Further assume that the augmented distinguishing matrix has smallest singular values", + "type": "text" + }, + { + "bbox": [ + 454, + 165, + 505, + 177 + ], + "score": 0.87, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ) \\geq", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 176, + 505, + 190 + ], + "spans": [ + { + "bbox": [ + 106, + 179, + 114, + 187 + ], + "score": 0.56, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 176, + 246, + 190 + ], + "score": 1.0, + "content": ". For any small enough \u000f, for any", + "type": "text" + }, + { + "bbox": [ + 246, + 177, + 270, + 188 + ], + "score": 0.89, + "content": "\\delta < 1", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 176, + 315, + 190 + ], + "score": 1.0, + "content": ", given poly", + "type": "text" + }, + { + "bbox": [ + 316, + 176, + 470, + 189 + ], + "score": 0.88, + "content": "\\left( \\Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \\epsilon , 1 / \\gamma , 1 / \\alpha , 1 / \\beta , 1 / \\delta \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 176, + 505, + 190 + ], + "score": 1.0, + "content": "number", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 189, + 501, + 204 + ], + "spans": [ + { + "bbox": [ + 105, + 189, + 302, + 204 + ], + "score": 1.0, + "content": "of i.i.d. samples, let the output of Algorithm 3 be", + "type": "text" + }, + { + "bbox": [ + 303, + 189, + 334, + 202 + ], + "score": 0.86, + "content": "\\hat { V } , \\hat { Z } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 189, + 473, + 204 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 473, + 191, + 496, + 201 + ], + "score": 0.8, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 496, + 189, + 501, + 204 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 7, + "bbox_fs": [ + 104, + 142, + 506, + 204 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 241, + 207, + 369, + 222 + ], + "lines": [ + { + "bbox": [ + 241, + 207, + 369, + 222 + ], + "spans": [ + { + "bbox": [ + 241, + 207, + 369, + 222 + ], + "score": 0.89, + "content": "\\| A \\sigma ( W x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\| \\le \\epsilon ,", + "type": "interline_equation", + "image_path": "bb6326c2231dac68813e7ef1a4d439b5b2dfd4fc41b4f99251db7488f7f3dcc8.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 241, + 207, + 369, + 222 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 228, + 169, + 239 + ], + "lines": [ + { + "bbox": [ + 104, + 227, + 167, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 227, + 160, + 240 + ], + "score": 1.0, + "content": "for any input", + "type": "text" + }, + { + "bbox": [ + 161, + 230, + 167, + 237 + ], + "score": 0.5, + "content": "x", + "type": "inline_equation" + } + ], + "index": 11 + } + ], + "index": 11, + "bbox_fs": [ + 104, + 227, + 167, + 240 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 248, + 505, + 294 + ], + "lines": [ + { + "bbox": [ + 105, + 248, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 248, + 505, + 261 + ], + "score": 1.0, + "content": "In order to prove the above Theorem, we need to show that each step of Algorithm 3 is robust. We", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 259, + 505, + 273 + ], + "spans": [ + { + "bbox": [ + 105, + 259, + 343, + 273 + ], + "score": 1.0, + "content": "can divide Algorithm 3 into three steps: finding the span of", + "type": "text" + }, + { + "bbox": [ + 343, + 259, + 391, + 272 + ], + "score": 0.86, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } ) ^ { \\cdot }", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 259, + 430, + 273 + ], + "score": 1.0, + "content": "’s; finding", + "type": "text" + }, + { + "bbox": [ + 431, + 261, + 440, + 271 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 259, + 505, + 273 + ], + "score": 1.0, + "content": "’s from the span", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 271, + 505, + 284 + ], + "spans": [ + { + "bbox": [ + 106, + 271, + 118, + 284 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 271, + 165, + 284 + ], + "score": 0.89, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 271, + 505, + 284 + ], + "score": 1.0, + "content": "’s; recovering first layer using Algorithm 1. We will first state the key lemmas that", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 283, + 460, + 295 + ], + "spans": [ + { + "bbox": [ + 105, + 283, + 460, + 295 + ], + "score": 1.0, + "content": "prove every step is robust to noise, and finally combine them to show our main theorem.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5, + "bbox_fs": [ + 105, + 248, + 505, + 295 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 299, + 505, + 380 + ], + "lines": [ + { + "bbox": [ + 105, + 299, + 506, + 312 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 506, + 312 + ], + "score": 1.0, + "content": "First, we show that with polynomial number of samples, we can approximate the span of", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 311, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 106, + 311, + 153, + 324 + ], + "score": 0.91, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 311, + 270, + 326 + ], + "score": 1.0, + "content": "’s in arbitrary accuracy. Let", + "type": "text" + }, + { + "bbox": [ + 270, + 311, + 279, + 322 + ], + "score": 0.85, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 311, + 397, + 326 + ], + "score": 1.0, + "content": "be the empirical estimate of", + "type": "text" + }, + { + "bbox": [ + 398, + 312, + 406, + 322 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 311, + 506, + 326 + ], + "score": 1.0, + "content": ", which is the pure neu-", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 323, + 505, + 334 + ], + "spans": [ + { + "bbox": [ + 106, + 323, + 484, + 334 + ], + "score": 1.0, + "content": "ron detector matrix as defined in Algorithm 3. As shown in Lemma 10, the null space of", + "type": "text" + }, + { + "bbox": [ + 485, + 324, + 494, + 333 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 323, + 505, + 334 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 333, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 185, + 347 + ], + "score": 1.0, + "content": "exactly the span of", + "type": "text" + }, + { + "bbox": [ + 186, + 333, + 232, + 346 + ], + "score": 0.89, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 334, + 505, + 347 + ], + "score": 1.0, + "content": "’s. We use standard matrix perturbation theory (see Section D.2) to", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 345, + 505, + 357 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 219, + 357 + ], + "score": 1.0, + "content": "show that the null space of", + "type": "text" + }, + { + "bbox": [ + 220, + 346, + 228, + 355 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 345, + 505, + 357 + ], + "score": 1.0, + "content": "is robust to small perturbations. More precisely, in Lemma 11, we", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 356, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 357, + 345, + 370 + ], + "score": 1.0, + "content": "show that with polynomial number of samples, the span of", + "type": "text" + }, + { + "bbox": [ + 345, + 358, + 352, + 367 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 357, + 452, + 370 + ], + "score": 1.0, + "content": "least singular vectors of", + "type": "text" + }, + { + "bbox": [ + 452, + 356, + 461, + 367 + ], + "score": 0.85, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 357, + 506, + 370 + ], + "score": 1.0, + "content": "is close to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 367, + 187, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 174, + 380 + ], + "score": 1.0, + "content": "the null space of", + "type": "text" + }, + { + "bbox": [ + 175, + 369, + 183, + 378 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 367, + 187, + 380 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 19, + "bbox_fs": [ + 105, + 299, + 506, + 380 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 383, + 505, + 437 + ], + "lines": [ + { + "bbox": [ + 104, + 381, + 506, + 397 + ], + "spans": [ + { + "bbox": [ + 104, + 381, + 358, + 397 + ], + "score": 1.0, + "content": "Lemma 11. Under the same assumptions as in Theorem 7, let", + "type": "text" + }, + { + "bbox": [ + 358, + 383, + 421, + 394 + ], + "score": 0.91, + "content": "S \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 381, + 506, + 397 + ], + "score": 1.0, + "content": "be the matrix whose", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 393, + 507, + 411 + ], + "spans": [ + { + "bbox": [ + 106, + 397, + 113, + 407 + ], + "score": 0.57, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 393, + 180, + 411 + ], + "score": 1.0, + "content": "columns are the", + "type": "text" + }, + { + "bbox": [ + 180, + 398, + 187, + 407 + ], + "score": 0.54, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 393, + 308, + 411 + ], + "score": 1.0, + "content": "least right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 308, + 397, + 316, + 407 + ], + "score": 0.66, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 393, + 385, + 411 + ], + "score": 1.0, + "content": ". Similarly define √", + "type": "text" + }, + { + "bbox": [ + 386, + 395, + 449, + 407 + ], + "score": 0.9, + "content": "\\hat { S } \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 449, + 393, + 507, + 411 + ], + "score": 1.0, + "content": "for empirical", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 102, + 402, + 509, + 429 + ], + "spans": [ + { + "bbox": [ + 102, + 402, + 142, + 429 + ], + "score": 1.0, + "content": "estimate", + "type": "text" + }, + { + "bbox": [ + 142, + 410, + 151, + 422 + ], + "score": 0.81, + "content": "\\hat { T } .", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 402, + 207, + 429 + ], + "score": 1.0, + "content": ". Then for any", + "type": "text" + }, + { + "bbox": [ + 208, + 412, + 242, + 424 + ], + "score": 0.91, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 242, + 402, + 275, + 429 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 276, + 412, + 300, + 423 + ], + "score": 0.9, + "content": "\\delta < 1", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 402, + 327, + 429 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 328, + 408, + 438, + 426 + ], + "score": 0.91, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } . } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 402, + 509, + 429 + ], + "score": 1.0, + "content": ") number of i.i.d.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 424, + 305, + 437 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 278, + 437 + ], + "score": 1.0, + "content": "samples, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 278, + 425, + 301, + 435 + ], + "score": 0.78, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 424, + 305, + 437 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5, + "bbox_fs": [ + 102, + 381, + 509, + 437 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 255, + 441, + 356, + 469 + ], + "lines": [ + { + "bbox": [ + 255, + 441, + 356, + 469 + ], + "spans": [ + { + "bbox": [ + 255, + 441, + 356, + 469 + ], + "score": 0.93, + "content": "\\lVert S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\rVert \\leq \\frac { \\sqrt { 2 } \\epsilon } { \\alpha \\beta ^ { 2 } } .", + "type": "interline_equation", + "image_path": "49c1e43446cfaa1659dc197db3d59ca3da99857ec357ab0642e8b2723ef52cd9.jpg" + } + ] + } + ], + "index": 27.5, + "virtual_lines": [ + { + "bbox": [ + 255, + 441, + 356, + 455.0 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 255, + 455.0, + 356, + 469.0 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 479, + 505, + 525 + ], + "lines": [ + { + "bbox": [ + 106, + 480, + 505, + 492 + ], + "spans": [ + { + "bbox": [ + 106, + 480, + 505, + 492 + ], + "score": 1.0, + "content": "The proof of the above lemma is in Section B.1. Basically, we need to lowerbound the spectral", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 104, + 490, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 104, + 491, + 127, + 505 + ], + "score": 1.0, + "content": "gap (", + "type": "text" + }, + { + "bbox": [ + 127, + 492, + 138, + 504 + ], + "score": 0.84, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 491, + 221, + 505 + ], + "score": 1.0, + "content": "-th singular value of", + "type": "text" + }, + { + "bbox": [ + 221, + 493, + 229, + 502 + ], + "score": 0.72, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 491, + 405, + 505 + ], + "score": 1.0, + "content": ") and to upperbound the Frobenius norm of", + "type": "text" + }, + { + "bbox": [ + 405, + 490, + 433, + 503 + ], + "score": 0.92, + "content": "T - { \\hat { T } }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 491, + 506, + 505 + ], + "score": 1.0, + "content": ". Standard matrix", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 503, + 505, + 516 + ], + "spans": [ + { + "bbox": [ + 105, + 503, + 505, + 516 + ], + "score": 1.0, + "content": "perturbation bound shows that if the perturbation is much smaller than the spectral gap, then the null", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 515, + 183, + 526 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 183, + 526 + ], + "score": 1.0, + "content": "space is preserved.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30.5, + "bbox_fs": [ + 104, + 480, + 506, + 526 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 530, + 505, + 575 + ], + "lines": [ + { + "bbox": [ + 104, + 529, + 506, + 545 + ], + "spans": [ + { + "bbox": [ + 104, + 529, + 271, + 545 + ], + "score": 1.0, + "content": "Next, we show that we can robustly find", + "type": "text" + }, + { + "bbox": [ + 272, + 532, + 281, + 542 + ], + "score": 0.82, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 529, + 359, + 545 + ], + "score": 1.0, + "content": "’s from the span of", + "type": "text" + }, + { + "bbox": [ + 359, + 530, + 406, + 543 + ], + "score": 0.91, + "content": "\\mathrm { v e c } ^ { * } ( z _ { i } z _ { i } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 529, + 506, + 545 + ], + "score": 1.0, + "content": "’s. Since this step of the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 542, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 542, + 505, + 554 + ], + "score": 1.0, + "content": "algorithm is the same as the simultaneous diagonalization algorithm for tensor decompositions, we", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 553, + 505, + 564 + ], + "spans": [ + { + "bbox": [ + 105, + 553, + 505, + 564 + ], + "score": 1.0, + "content": "use the robustness of simultaneous diagonalization (Bhaskara et al., 2014) to show that we can find", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 564, + 308, + 576 + ], + "spans": [ + { + "bbox": [ + 106, + 565, + 115, + 575 + ], + "score": 0.83, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 564, + 308, + 576 + ], + "score": 1.0, + "content": "’s robustly. The detailed proof is in Section B.2.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 34.5, + "bbox_fs": [ + 104, + 529, + 506, + 576 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 578, + 505, + 654 + ], + "lines": [ + { + "bbox": [ + 104, + 576, + 504, + 595 + ], + "spans": [ + { + "bbox": [ + 104, + 576, + 221, + 595 + ], + "score": 1.0, + "content": "Lemma 12. Suppose that", + "type": "text" + }, + { + "bbox": [ + 222, + 578, + 504, + 592 + ], + "score": 0.86, + "content": "\\begin{array} { r c l } { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } & { \\leq } & { \\epsilon , \\| A \\| } \\\\ & { } & { \\geq } \\end{array} \\leq \\epsilon , \\| A \\| \\ \\leq \\ { P } _ { 1 } , \\| \\xi \\| \\ \\leq \\ P _ { 2 } , \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\ \\geq", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 591, + 506, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 593, + 181, + 605 + ], + "score": 0.9, + "content": "\\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 591, + 209, + 606 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 210, + 592, + 362, + 605 + ], + "score": 0.9, + "content": "\\hat { X } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 1 } ) , \\hat { Y } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 591, + 397, + 606 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 397, + 594, + 408, + 605 + ], + "score": 0.87, + "content": "\\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 591, + 431, + 606 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 431, + 594, + 441, + 605 + ], + "score": 0.86, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 591, + 506, + 606 + ], + "score": 1.0, + "content": "are two inde-", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 604, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 278, + 617 + ], + "score": 1.0, + "content": "pendent standard Gaussian vectors. Let", + "type": "text" + }, + { + "bbox": [ + 279, + 606, + 316, + 616 + ], + "score": 0.87, + "content": "z _ { 1 } , \\cdots z _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 604, + 461, + 617 + ], + "score": 1.0, + "content": "be the normalized row vectors of", + "type": "text" + }, + { + "bbox": [ + 462, + 604, + 480, + 615 + ], + "score": 0.89, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 480, + 604, + 506, + 617 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 615, + 506, + 629 + ], + "spans": [ + { + "bbox": [ + 106, + 617, + 143, + 628 + ], + "score": 0.89, + "content": "\\hat { z } _ { 1 } , . . . , \\hat { z } _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 616, + 237, + 629 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 237, + 615, + 266, + 628 + ], + "score": 0.9, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 616, + 371, + 629 + ], + "score": 1.0, + "content": "(after sign flip). For any", + "type": "text" + }, + { + "bbox": [ + 371, + 617, + 398, + 627 + ], + "score": 0.89, + "content": "\\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 616, + 475, + 629 + ], + "score": 1.0, + "content": "and small enough", + "type": "text" + }, + { + "bbox": [ + 475, + 618, + 481, + 627 + ], + "score": 0.39, + "content": "\\epsilon _ { \\mathrm { { \\mathrm { { } } } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 616, + 506, + 629 + ], + "score": 1.0, + "content": ", with", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 107, + 624, + 508, + 648 + ], + "spans": [ + { + "bbox": [ + 107, + 628, + 205, + 644 + ], + "score": 0.9, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 624, + 315, + 648 + ], + "score": 1.0, + "content": "number of i.i.d. samples in", + "type": "text" + }, + { + "bbox": [ + 316, + 630, + 345, + 644 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 346, + 624, + 447, + 648 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + }, + { + "bbox": [ + 447, + 632, + 469, + 642 + ], + "score": 0.8, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 624, + 508, + 648 + ], + "score": 1.0, + "content": "over the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 641, + 456, + 655 + ], + "spans": [ + { + "bbox": [ + 105, + 641, + 167, + 655 + ], + "score": 1.0, + "content": "randomness of", + "type": "text" + }, + { + "bbox": [ + 167, + 643, + 190, + 654 + ], + "score": 0.86, + "content": "\\zeta _ { 1 } , \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 641, + 373, + 655 + ], + "score": 1.0, + "content": "and i.i.d. samples, there exists a permutation", + "type": "text" + }, + { + "bbox": [ + 373, + 642, + 414, + 654 + ], + "score": 0.93, + "content": "\\pi ( i ) \\in [ \\dot { k } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 641, + 456, + 655 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 39.5, + "bbox_fs": [ + 104, + 576, + 508, + 655 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 659, + 384, + 673 + ], + "lines": [ + { + "bbox": [ + 225, + 659, + 384, + 673 + ], + "spans": [ + { + "bbox": [ + 225, + 659, + 384, + 673 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\| \\hat { z } _ { i } - z _ { \\pi [ i ] } \\| \\le p o l y ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) , } \\end{array}", + "type": "interline_equation", + "image_path": "479ebdc9be9eb6d30a3812a68559d3c0cc96846422cdd6be07f7c9d174e59a64.jpg" + } + ] + } + ], + "index": 43, + "virtual_lines": [ + { + "bbox": [ + 225, + 659, + 384, + 673 + ], + "spans": [], + "index": 43 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 677, + 181, + 690 + ], + "lines": [ + { + "bbox": [ + 104, + 677, + 179, + 691 + ], + "spans": [ + { + "bbox": [ + 104, + 677, + 137, + 691 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 138, + 678, + 179, + 689 + ], + "score": 0.89, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + } + ], + "index": 44 + } + ], + "index": 44, + "bbox_fs": [ + 104, + 677, + 179, + 691 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 698, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 164, + 711 + ], + "score": 1.0, + "content": "Finally, given", + "type": "text" + }, + { + "bbox": [ + 164, + 699, + 174, + 710 + ], + "score": 0.86, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "’s, the problem reduces to a one-layer problem. We will first give an analysis for", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "Algorithm 1 as a warm-up. When we call Algorithm 1 from Algorithm 3, the situation is slightly", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "different. Note we reserve fresh samples for this step, so that the samples used by Algorithm 1 are", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 82, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 246, + 95 + ], + "score": 1.0, + "content": "still independent with the estimate", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 246, + 83, + 256, + 93 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 256, + 82, + 485, + 95 + ], + "score": 1.0, + "content": "(learned using the other set of samples). However, since", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 485, + 83, + 495, + 93 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 495, + 82, + 506, + 95 + ], + "score": 1.0, + "content": "is", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 504, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 157, + 106 + ], + "score": 1.0, + "content": "not equal to", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 157, + 95, + 166, + 105 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 166, + 93, + 331, + 106 + ], + "score": 1.0, + "content": ", this introduces an additional error term", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 331, + 93, + 380, + 106 + ], + "score": 0.92, + "content": "\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 381, + 93, + 497, + 106 + ], + "score": 1.0, + "content": "which is not independent of", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 497, + 95, + 504, + 104 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 504, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 212, + 117 + ], + "score": 1.0, + "content": "and cannot be captured by", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 213, + 105, + 218, + 116 + ], + "score": 0.79, + "content": "\\xi", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 219, + 105, + 504, + 117 + ], + "score": 1.0, + "content": ". We modify the proof for Algorithm 1 to show that the algorithm is still", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 115, + 283, + 128 + ], + "spans": [ + { + "bbox": [ + 106, + 116, + 176, + 128 + ], + "score": 1.0, + "content": "robust as long as", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 176, + 115, + 214, + 128 + ], + "score": 0.93, + "content": "\\| \\hat { z } _ { i } - z _ { i } \\|", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 215, + 116, + 283, + 128 + ], + "score": 1.0, + "content": "is small enough.", + "type": "text", + "cross_page": true + } + ], + "index": 3 + } + ], + "index": 46, + "bbox_fs": [ + 105, + 699, + 505, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 505, + 127 + ], + "lines": [ + { + "bbox": [ + 105, + 82, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 246, + 95 + ], + "score": 1.0, + "content": "still independent with the estimate", + "type": "text" + }, + { + "bbox": [ + 246, + 83, + 256, + 93 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 82, + 485, + 95 + ], + "score": 1.0, + "content": "(learned using the other set of samples). However, since", + "type": "text" + }, + { + "bbox": [ + 485, + 83, + 495, + 93 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 82, + 506, + 95 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 504, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 157, + 106 + ], + "score": 1.0, + "content": "not equal to", + "type": "text" + }, + { + "bbox": [ + 157, + 95, + 166, + 105 + ], + "score": 0.84, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 93, + 331, + 106 + ], + "score": 1.0, + "content": ", this introduces an additional error term", + "type": "text" + }, + { + "bbox": [ + 331, + 93, + 380, + 106 + ], + "score": 0.92, + "content": "\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 93, + 497, + 106 + ], + "score": 1.0, + "content": "which is not independent of", + "type": "text" + }, + { + "bbox": [ + 497, + 95, + 504, + 104 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 504, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 212, + 117 + ], + "score": 1.0, + "content": "and cannot be captured by", + "type": "text" + }, + { + "bbox": [ + 213, + 105, + 218, + 116 + ], + "score": 0.79, + "content": "\\xi", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 105, + 504, + 117 + ], + "score": 1.0, + "content": ". We modify the proof for Algorithm 1 to show that the algorithm is still", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 115, + 283, + 128 + ], + "spans": [ + { + "bbox": [ + 106, + 116, + 176, + 128 + ], + "score": 1.0, + "content": "robust as long as", + "type": "text" + }, + { + "bbox": [ + 176, + 115, + 214, + 128 + ], + "score": 0.93, + "content": "\\| \\hat { z } _ { i } - z _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 116, + 283, + 128 + ], + "score": 1.0, + "content": "is small enough.", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5 + }, + { + "type": "text", + "bbox": [ + 105, + 129, + 505, + 170 + ], + "lines": [ + { + "bbox": [ + 105, + 128, + 506, + 144 + ], + "spans": [ + { + "bbox": [ + 105, + 128, + 212, + 144 + ], + "score": 1.0, + "content": "Lemma 13. Assume that", + "type": "text" + }, + { + "bbox": [ + 213, + 130, + 345, + 143 + ], + "score": 0.92, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 128, + 365, + 144 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 365, + 129, + 444, + 142 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 128, + 506, + 144 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 101, + 139, + 508, + 161 + ], + "spans": [ + { + "bbox": [ + 101, + 139, + 508, + 161 + ], + "score": 1.0, + "content": "for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any \u000f ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ4\u000f2 )", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 157, + 413, + 171 + ], + "spans": [ + { + "bbox": [ + 105, + 157, + 241, + 171 + ], + "score": 1.0, + "content": "number of samples for Algorithm", + "type": "text" + }, + { + "bbox": [ + 241, + 159, + 247, + 168 + ], + "score": 0.57, + "content": "^ { l }", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 157, + 385, + 171 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 386, + 158, + 408, + 169 + ], + "score": 0.85, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 157, + 413, + 171 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5 + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 174, + 384, + 203 + ], + "lines": [ + { + "bbox": [ + 226, + 174, + 384, + 203 + ], + "spans": [ + { + "bbox": [ + 226, + 174, + 384, + 203 + ], + "score": 0.93, + "content": "\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon ,", + "type": "interline_equation", + "image_path": "2331d3bf506bfc4d6ba28306e887705bd9fc1c1ba29b9ae951a099b508a8da02.jpg" + } + ] + } + ], + "index": 7.5, + "virtual_lines": [ + { + "bbox": [ + 226, + 174, + 384, + 188.5 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 226, + 188.5, + 384, + 203.0 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 207, + 186, + 219 + ], + "lines": [ + { + "bbox": [ + 104, + 207, + 187, + 221 + ], + "spans": [ + { + "bbox": [ + 104, + 207, + 141, + 221 + ], + "score": 1.0, + "content": "for each", + "type": "text" + }, + { + "bbox": [ + 142, + 208, + 183, + 219 + ], + "score": 0.9, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 207, + 187, + 221 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 228, + 398, + 241 + ], + "lines": [ + { + "bbox": [ + 106, + 227, + 400, + 242 + ], + "spans": [ + { + "bbox": [ + 106, + 227, + 400, + 242 + ], + "score": 1.0, + "content": "Combining the above three lemmas, we prove Theorem 7 in Section B.4.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 108, + 252, + 404, + 267 + ], + "lines": [ + { + "bbox": [ + 105, + 252, + 404, + 267 + ], + "spans": [ + { + "bbox": [ + 105, + 252, + 334, + 267 + ], + "score": 1.0, + "content": "B.1 ROBUST ANALYSIS FOR FINDING THE SPAN OF", + "type": "text" + }, + { + "bbox": [ + 334, + 253, + 395, + 267 + ], + "score": 0.9, + "content": "\\{ \\mathrm { V E C } ^ { * } ( z _ { i } z _ { j } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 252, + 404, + 267 + ], + "score": 1.0, + "content": "’ S", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 276, + 505, + 321 + ], + "lines": [ + { + "bbox": [ + 105, + 276, + 506, + 290 + ], + "spans": [ + { + "bbox": [ + 105, + 276, + 309, + 290 + ], + "score": 1.0, + "content": "We first prove that the step of finding the span of", + "type": "text" + }, + { + "bbox": [ + 309, + 276, + 366, + 290 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { j } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 276, + 506, + 290 + ], + "score": 1.0, + "content": "is robust. The main idea is based", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 288, + 505, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 481, + 300 + ], + "score": 1.0, + "content": "on standard matrix perturbation bounds (see Section D.2). We first give a lowerbound on the", + "type": "text" + }, + { + "bbox": [ + 482, + 288, + 493, + 299 + ], + "score": 0.87, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 288, + 505, + 300 + ], + "score": 1.0, + "content": "-th", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 299, + 505, + 312 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 176, + 312 + ], + "score": 1.0, + "content": "singular value of", + "type": "text" + }, + { + "bbox": [ + 176, + 299, + 184, + 309 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 299, + 505, + 312 + ], + "score": 1.0, + "content": ", giving a spectral gap between the smallest non-zero singular value and the null", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 104, + 309, + 369, + 322 + ], + "spans": [ + { + "bbox": [ + 104, + 309, + 369, + 322 + ], + "score": 1.0, + "content": "space. See the lemma below. The proof is given in Section B.1.1.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5 + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 504, + 347 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 506, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 196, + 338 + ], + "score": 1.0, + "content": "Lemma 14. Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 324, + 319, + 337 + ], + "score": 0.9, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ) \\geq \\alpha , \\sigma _ { \\mathrm { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 324, + 410, + 338 + ], + "score": 1.0, + "content": ", we know that matrix", + "type": "text" + }, + { + "bbox": [ + 411, + 325, + 419, + 335 + ], + "score": 0.74, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 324, + 459, + 338 + ], + "score": 1.0, + "content": "has rank", + "type": "text" + }, + { + "bbox": [ + 459, + 325, + 470, + 336 + ], + "score": 0.86, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 324, + 506, + 338 + ], + "score": 1.0, + "content": "and the", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 335, + 314, + 348 + ], + "spans": [ + { + "bbox": [ + 106, + 336, + 117, + 347 + ], + "score": 0.86, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 335, + 199, + 348 + ], + "score": 1.0, + "content": "-th singular value of", + "type": "text" + }, + { + "bbox": [ + 200, + 336, + 208, + 345 + ], + "score": 0.71, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 335, + 293, + 348 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + }, + { + "bbox": [ + 293, + 335, + 310, + 347 + ], + "score": 0.87, + "content": "\\dot { \\alpha } \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 335, + 314, + 348 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 16.5 + }, + { + "type": "text", + "bbox": [ + 106, + 357, + 506, + 391 + ], + "lines": [ + { + "bbox": [ + 106, + 356, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 322, + 370 + ], + "score": 1.0, + "content": "Then we show that with enough samples the estimate", + "type": "text" + }, + { + "bbox": [ + 323, + 356, + 331, + 368 + ], + "score": 0.86, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 332, + 357, + 407, + 370 + ], + "score": 1.0, + "content": "is close enough to", + "type": "text" + }, + { + "bbox": [ + 407, + 358, + 416, + 368 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 357, + 505, + 370 + ], + "score": 1.0, + "content": ", so Wedin’s Theorem", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 369, + 505, + 381 + ], + "spans": [ + { + "bbox": [ + 106, + 369, + 407, + 381 + ], + "score": 1.0, + "content": "(Lemma 25) implies the subspace found is also close to the true nullspace of", + "type": "text" + }, + { + "bbox": [ + 407, + 370, + 415, + 379 + ], + "score": 0.81, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 369, + 505, + 381 + ], + "score": 1.0, + "content": ". The proof is deferred", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 380, + 176, + 390 + ], + "spans": [ + { + "bbox": [ + 105, + 380, + 176, + 390 + ], + "score": 1.0, + "content": "to Section B.1.2.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19 + }, + { + "type": "text", + "bbox": [ + 106, + 394, + 505, + 424 + ], + "lines": [ + { + "bbox": [ + 104, + 393, + 506, + 410 + ], + "spans": [ + { + "bbox": [ + 104, + 393, + 210, + 410 + ], + "score": 1.0, + "content": "Lemma 15. Assume that", + "type": "text" + }, + { + "bbox": [ + 211, + 395, + 335, + 407 + ], + "score": 0.89, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 393, + 354, + 410 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 355, + 394, + 451, + 407 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 393, + 506, + 410 + ], + "score": 1.0, + "content": ", then for any", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 401, + 504, + 427 + ], + "spans": [ + { + "bbox": [ + 106, + 410, + 141, + 423 + ], + "score": 0.9, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 401, + 175, + 427 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 176, + 410, + 218, + 421 + ], + "score": 0.89, + "content": "1 > \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 401, + 246, + 427 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 246, + 407, + 358, + 425 + ], + "score": 0.9, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 359, + 401, + 504, + 427 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we know", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21.5 + }, + { + "type": "interline_equation", + "bbox": [ + 272, + 430, + 337, + 446 + ], + "lines": [ + { + "bbox": [ + 272, + 430, + 337, + 446 + ], + "spans": [ + { + "bbox": [ + 272, + 430, + 337, + 446 + ], + "score": 0.87, + "content": "\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon ,", + "type": "interline_equation", + "image_path": "abc7ca62e3ec925997666ec59403b38cbfd525aeb6fdeab9a21cb64044ef45ae.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 272, + 430, + 337, + 446 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 450, + 230, + 462 + ], + "lines": [ + { + "bbox": [ + 106, + 450, + 231, + 463 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 204, + 463 + ], + "score": 1.0, + "content": "with probability at least", + "type": "text" + }, + { + "bbox": [ + 204, + 451, + 227, + 461 + ], + "score": 0.81, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 450, + 231, + 463 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 106, + 471, + 505, + 496 + ], + "lines": [ + { + "bbox": [ + 105, + 469, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 105, + 469, + 411, + 486 + ], + "score": 1.0, + "content": "Finally we combine the above two lemmas and show that the span of the least", + "type": "text" + }, + { + "bbox": [ + 412, + 472, + 418, + 482 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 469, + 505, + 486 + ], + "score": 1.0, + "content": "right singular vectors", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 483, + 249, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 117, + 497 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 483, + 126, + 494 + ], + "score": 0.86, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 483, + 237, + 497 + ], + "score": 1.0, + "content": "is close to the null space of", + "type": "text" + }, + { + "bbox": [ + 237, + 484, + 246, + 494 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 483, + 249, + 497 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25.5 + }, + { + "type": "text", + "bbox": [ + 106, + 499, + 506, + 552 + ], + "lines": [ + { + "bbox": [ + 105, + 497, + 506, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 358, + 513 + ], + "score": 1.0, + "content": "Lemma 11. Under the same assumptions as in Theorem 7, let", + "type": "text" + }, + { + "bbox": [ + 358, + 499, + 421, + 510 + ], + "score": 0.91, + "content": "S \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 497, + 506, + 513 + ], + "score": 1.0, + "content": "be the matrix whose", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 509, + 506, + 526 + ], + "spans": [ + { + "bbox": [ + 107, + 513, + 113, + 523 + ], + "score": 0.46, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 509, + 180, + 526 + ], + "score": 1.0, + "content": "columns are the", + "type": "text" + }, + { + "bbox": [ + 180, + 513, + 187, + 523 + ], + "score": 0.3, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 509, + 308, + 526 + ], + "score": 1.0, + "content": "least right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 308, + 513, + 316, + 523 + ], + "score": 0.71, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 509, + 385, + 526 + ], + "score": 1.0, + "content": ". Similarly define", + "type": "text" + }, + { + "bbox": [ + 386, + 511, + 449, + 523 + ], + "score": 0.89, + "content": "\\hat { S } \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 449, + 509, + 506, + 526 + ], + "score": 1.0, + "content": "for empirical", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 102, + 518, + 509, + 545 + ], + "spans": [ + { + "bbox": [ + 102, + 518, + 142, + 545 + ], + "score": 1.0, + "content": "estimate", + "type": "text" + }, + { + "bbox": [ + 142, + 526, + 150, + 538 + ], + "score": 0.79, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 518, + 207, + 545 + ], + "score": 1.0, + "content": ". Then for any", + "type": "text" + }, + { + "bbox": [ + 207, + 528, + 242, + 540 + ], + "score": 0.91, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 242, + 518, + 275, + 545 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 276, + 528, + 300, + 539 + ], + "score": 0.9, + "content": "\\delta < 1", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 518, + 327, + 545 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 328, + 523, + 438, + 542 + ], + "score": 0.91, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\dot { \\Gamma } P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } . } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 518, + 509, + 545 + ], + "score": 1.0, + "content": ") number of i.i.d.", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 540, + 305, + 553 + ], + "spans": [ + { + "bbox": [ + 106, + 540, + 278, + 553 + ], + "score": 1.0, + "content": "samples, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 279, + 541, + 301, + 551 + ], + "score": 0.85, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 301, + 540, + 305, + 553 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 28.5 + }, + { + "type": "interline_equation", + "bbox": [ + 255, + 557, + 356, + 585 + ], + "lines": [ + { + "bbox": [ + 255, + 557, + 356, + 585 + ], + "spans": [ + { + "bbox": [ + 255, + 557, + 356, + 585 + ], + "score": 0.92, + "content": "\\lVert S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\rVert \\leq \\frac { \\sqrt { 2 } \\epsilon } { \\alpha \\beta ^ { 2 } } .", + "type": "interline_equation", + "image_path": "10f34eb23d02b3f5e2031d0832179b2b9f311310a62f7adbefee6210d14c369c.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 255, + 557, + 356, + 585 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 596, + 504, + 625 + ], + "lines": [ + { + "bbox": [ + 102, + 589, + 509, + 619 + ], + "spans": [ + { + "bbox": [ + 102, + 589, + 267, + 619 + ], + "score": 1.0, + "content": "Proof. According to Lemma 15, given", + "type": "text" + }, + { + "bbox": [ + 268, + 596, + 380, + 615 + ], + "score": 0.93, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 589, + 509, + 619 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 613, + 255, + 627 + ], + "spans": [ + { + "bbox": [ + 106, + 613, + 227, + 627 + ], + "score": 1.0, + "content": "know with probability at least", + "type": "text" + }, + { + "bbox": [ + 228, + 614, + 251, + 624 + ], + "score": 0.85, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 613, + 255, + 627 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5 + }, + { + "type": "interline_equation", + "bbox": [ + 272, + 624, + 337, + 639 + ], + "lines": [ + { + "bbox": [ + 272, + 624, + 337, + 639 + ], + "spans": [ + { + "bbox": [ + 272, + 624, + 337, + 639 + ], + "score": 0.87, + "content": "\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon .", + "type": "interline_equation", + "image_path": "94b25f5782ec291f0d1df7c1aeb912811374793f779048646c95556c63218f0c.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 272, + 624, + 337, + 639 + ], + "spans": [], + "index": 34 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 640, + 447, + 654 + ], + "lines": [ + { + "bbox": [ + 106, + 640, + 448, + 654 + ], + "spans": [ + { + "bbox": [ + 106, + 640, + 248, + 654 + ], + "score": 1.0, + "content": "According to Lemma 14, we know", + "type": "text" + }, + { + "bbox": [ + 248, + 641, + 308, + 654 + ], + "score": 0.93, + "content": "\\sigma _ { k _ { 2 } } ( T ) \\geq \\alpha \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 640, + 448, + 654 + ], + "score": 1.0, + "content": ". 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Assume that", + "type": "text" + }, + { + "bbox": [ + 213, + 130, + 345, + 143 + ], + "score": 0.92, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 128, + 365, + 144 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 365, + 129, + 444, + 142 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 128, + 506, + 144 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 101, + 139, + 508, + 161 + ], + "spans": [ + { + "bbox": [ + 101, + 139, + 508, + 161 + ], + "score": 1.0, + "content": "for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any \u000f ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ4\u000f2 )", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 157, + 413, + 171 + ], + "spans": [ + { + "bbox": [ + 105, + 157, + 241, + 171 + ], + "score": 1.0, + "content": "number of samples for Algorithm", + "type": "text" + }, + { + "bbox": [ + 241, + 159, + 247, + 168 + ], + "score": 0.57, + "content": "^ { l }", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 157, + 385, + 171 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 386, + 158, + 408, + 169 + ], + "score": 0.85, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 157, + 413, + 171 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5, + "bbox_fs": [ + 101, + 128, + 508, + 171 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 174, + 384, + 203 + ], + "lines": [ + { + "bbox": [ + 226, + 174, + 384, + 203 + ], + "spans": [ + { + "bbox": [ + 226, + 174, + 384, + 203 + ], + "score": 0.93, + "content": "\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon ,", + "type": "interline_equation", + "image_path": "2331d3bf506bfc4d6ba28306e887705bd9fc1c1ba29b9ae951a099b508a8da02.jpg" + } + ] + } + ], + "index": 7.5, + "virtual_lines": [ + { + "bbox": [ + 226, + 174, + 384, + 188.5 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 226, + 188.5, + 384, + 203.0 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 207, + 186, + 219 + ], + "lines": [ + { + "bbox": [ + 104, + 207, + 187, + 221 + ], + "spans": [ + { + "bbox": [ + 104, + 207, + 141, + 221 + ], + "score": 1.0, + "content": "for each", + "type": "text" + }, + { + "bbox": [ + 142, + 208, + 183, + 219 + ], + "score": 0.9, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 207, + 187, + 221 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9, + "bbox_fs": [ + 104, + 207, + 187, + 221 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 228, + 398, + 241 + ], + "lines": [ + { + "bbox": [ + 106, + 227, + 400, + 242 + ], + "spans": [ + { + "bbox": [ + 106, + 227, + 400, + 242 + ], + "score": 1.0, + "content": "Combining the above three lemmas, we prove Theorem 7 in Section B.4.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10, + "bbox_fs": [ + 106, + 227, + 400, + 242 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 252, + 404, + 267 + ], + "lines": [ + { + "bbox": [ + 105, + 252, + 404, + 267 + ], + "spans": [ + { + "bbox": [ + 105, + 252, + 334, + 267 + ], + "score": 1.0, + "content": "B.1 ROBUST ANALYSIS FOR FINDING THE SPAN OF", + "type": "text" + }, + { + "bbox": [ + 334, + 253, + 395, + 267 + ], + "score": 0.9, + "content": "\\{ \\mathrm { V E C } ^ { * } ( z _ { i } z _ { j } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 252, + 404, + 267 + ], + "score": 1.0, + "content": "’ S", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11, + "bbox_fs": [ + 105, + 252, + 404, + 267 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 276, + 505, + 321 + ], + "lines": [ + { + "bbox": [ + 105, + 276, + 506, + 290 + ], + "spans": [ + { + "bbox": [ + 105, + 276, + 309, + 290 + ], + "score": 1.0, + "content": "We first prove that the step of finding the span of", + "type": "text" + }, + { + "bbox": [ + 309, + 276, + 366, + 290 + ], + "score": 0.93, + "content": "\\{ \\mathrm { v e c } ^ { * } ( z _ { i } z _ { j } ^ { \\top } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 276, + 506, + 290 + ], + "score": 1.0, + "content": "is robust. The main idea is based", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 288, + 505, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 481, + 300 + ], + "score": 1.0, + "content": "on standard matrix perturbation bounds (see Section D.2). We first give a lowerbound on the", + "type": "text" + }, + { + "bbox": [ + 482, + 288, + 493, + 299 + ], + "score": 0.87, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 288, + 505, + 300 + ], + "score": 1.0, + "content": "-th", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 299, + 505, + 312 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 176, + 312 + ], + "score": 1.0, + "content": "singular value of", + "type": "text" + }, + { + "bbox": [ + 176, + 299, + 184, + 309 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 299, + 505, + 312 + ], + "score": 1.0, + "content": ", giving a spectral gap between the smallest non-zero singular value and the null", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 104, + 309, + 369, + 322 + ], + "spans": [ + { + "bbox": [ + 104, + 309, + 369, + 322 + ], + "score": 1.0, + "content": "space. See the lemma below. The proof is given in Section B.1.1.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5, + "bbox_fs": [ + 104, + 276, + 506, + 322 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 504, + 347 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 506, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 196, + 338 + ], + "score": 1.0, + "content": "Lemma 14. Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 324, + 319, + 337 + ], + "score": 0.9, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ) \\geq \\alpha , \\sigma _ { \\mathrm { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 324, + 410, + 338 + ], + "score": 1.0, + "content": ", we know that matrix", + "type": "text" + }, + { + "bbox": [ + 411, + 325, + 419, + 335 + ], + "score": 0.74, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 324, + 459, + 338 + ], + "score": 1.0, + "content": "has rank", + "type": "text" + }, + { + "bbox": [ + 459, + 325, + 470, + 336 + ], + "score": 0.86, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 324, + 506, + 338 + ], + "score": 1.0, + "content": "and the", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 335, + 314, + 348 + ], + "spans": [ + { + "bbox": [ + 106, + 336, + 117, + 347 + ], + "score": 0.86, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 335, + 199, + 348 + ], + "score": 1.0, + "content": "-th singular value of", + "type": "text" + }, + { + "bbox": [ + 200, + 336, + 208, + 345 + ], + "score": 0.71, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 335, + 293, + 348 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + }, + { + "bbox": [ + 293, + 335, + 310, + 347 + ], + "score": 0.87, + "content": "\\dot { \\alpha } \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 335, + 314, + 348 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 16.5, + "bbox_fs": [ + 105, + 324, + 506, + 348 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 357, + 506, + 391 + ], + "lines": [ + { + "bbox": [ + 106, + 356, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 322, + 370 + ], + "score": 1.0, + "content": "Then we show that with enough samples the estimate", + "type": "text" + }, + { + "bbox": [ + 323, + 356, + 331, + 368 + ], + "score": 0.86, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 332, + 357, + 407, + 370 + ], + "score": 1.0, + "content": "is close enough to", + "type": "text" + }, + { + "bbox": [ + 407, + 358, + 416, + 368 + ], + "score": 0.8, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 357, + 505, + 370 + ], + "score": 1.0, + "content": ", so Wedin’s Theorem", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 369, + 505, + 381 + ], + "spans": [ + { + "bbox": [ + 106, + 369, + 407, + 381 + ], + "score": 1.0, + "content": "(Lemma 25) implies the subspace found is also close to the true nullspace of", + "type": "text" + }, + { + "bbox": [ + 407, + 370, + 415, + 379 + ], + "score": 0.81, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 369, + 505, + 381 + ], + "score": 1.0, + "content": ". The proof is deferred", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 380, + 176, + 390 + ], + "spans": [ + { + "bbox": [ + 105, + 380, + 176, + 390 + ], + "score": 1.0, + "content": "to Section B.1.2.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19, + "bbox_fs": [ + 105, + 356, + 505, + 390 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 394, + 505, + 424 + ], + "lines": [ + { + "bbox": [ + 104, + 393, + 506, + 410 + ], + "spans": [ + { + "bbox": [ + 104, + 393, + 210, + 410 + ], + "score": 1.0, + "content": "Lemma 15. Assume that", + "type": "text" + }, + { + "bbox": [ + 211, + 395, + 335, + 407 + ], + "score": 0.89, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 393, + 354, + 410 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 355, + 394, + 451, + 407 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 393, + 506, + 410 + ], + "score": 1.0, + "content": ", then for any", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 401, + 504, + 427 + ], + "spans": [ + { + "bbox": [ + 106, + 410, + 141, + 423 + ], + "score": 0.9, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 401, + 175, + 427 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 176, + 410, + 218, + 421 + ], + "score": 0.89, + "content": "1 > \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 401, + 246, + 427 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 246, + 407, + 358, + 425 + ], + "score": 0.9, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 359, + 401, + 504, + 427 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we know", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21.5, + "bbox_fs": [ + 104, + 393, + 506, + 427 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 272, + 430, + 337, + 446 + ], + "lines": [ + { + "bbox": [ + 272, + 430, + 337, + 446 + ], + "spans": [ + { + "bbox": [ + 272, + 430, + 337, + 446 + ], + "score": 0.87, + "content": "\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon ,", + "type": "interline_equation", + "image_path": "abc7ca62e3ec925997666ec59403b38cbfd525aeb6fdeab9a21cb64044ef45ae.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 272, + 430, + 337, + 446 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 450, + 230, + 462 + ], + "lines": [ + { + "bbox": [ + 106, + 450, + 231, + 463 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 204, + 463 + ], + "score": 1.0, + "content": "with probability at least", + "type": "text" + }, + { + "bbox": [ + 204, + 451, + 227, + 461 + ], + "score": 0.81, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 450, + 231, + 463 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24, + "bbox_fs": [ + 106, + 450, + 231, + 463 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 471, + 505, + 496 + ], + "lines": [ + { + "bbox": [ + 105, + 469, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 105, + 469, + 411, + 486 + ], + "score": 1.0, + "content": "Finally we combine the above two lemmas and show that the span of the least", + "type": "text" + }, + { + "bbox": [ + 412, + 472, + 418, + 482 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 469, + 505, + 486 + ], + "score": 1.0, + "content": "right singular vectors", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 483, + 249, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 117, + 497 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 483, + 126, + 494 + ], + "score": 0.86, + "content": "\\hat { T }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 483, + 237, + 497 + ], + "score": 1.0, + "content": "is close to the null space of", + "type": "text" + }, + { + "bbox": [ + 237, + 484, + 246, + 494 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 483, + 249, + 497 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25.5, + "bbox_fs": [ + 105, + 469, + 505, + 497 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 499, + 506, + 552 + ], + "lines": [ + { + "bbox": [ + 105, + 497, + 506, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 358, + 513 + ], + "score": 1.0, + "content": "Lemma 11. Under the same assumptions as in Theorem 7, let", + "type": "text" + }, + { + "bbox": [ + 358, + 499, + 421, + 510 + ], + "score": 0.91, + "content": "S \\in \\mathbb { R } ^ { ( k _ { 2 } + k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 497, + 506, + 513 + ], + "score": 1.0, + "content": "be the matrix whose", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 509, + 506, + 526 + ], + "spans": [ + { + "bbox": [ + 107, + 513, + 113, + 523 + ], + "score": 0.46, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 509, + 180, + 526 + ], + "score": 1.0, + "content": "columns are the", + "type": "text" + }, + { + "bbox": [ + 180, + 513, + 187, + 523 + ], + "score": 0.3, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 509, + 308, + 526 + ], + "score": 1.0, + "content": "least right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 308, + 513, + 316, + 523 + ], + "score": 0.71, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 509, + 385, + 526 + ], + "score": 1.0, + "content": ". 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The definitions of these four matrices", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 107, + 273, + 507, + 291 + ], + "spans": [ + { + "bbox": [ + 107, + 276, + 383, + 290 + ], + "score": 0.84, + "content": "M \\in \\mathbb { R } ^ { d ^ { 2 } \\times ( k _ { 2 } + 1 ) } , B \\in \\mathbb { R } ^ { ( k _ { 2 } + 1 ) \\times k _ { 2 } } , C \\in \\mathbb { R } ^ { ( k _ { 2 } \\times k ^ { 2 } ) } , F \\in \\mathbb { R } ^ { k ^ { 2 } \\times ( k _ { 2 } + k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 273, + 507, + 291 + ], + "score": 1.0, + "content": "will be introduced later as we", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 289, + 315, + 301 + ], + "spans": [ + { + "bbox": [ + 105, + 289, + 315, + 301 + ], + "score": 1.0, + "content": "explain their effects. 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Suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 614, + 319, + 626 + ], + "score": 0.9, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ) \\geq \\alpha , \\sigma _ { \\mathrm { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 613, + 410, + 627 + ], + "score": 1.0, + "content": ", we know that matrix", + "type": "text" + }, + { + "bbox": [ + 411, + 615, + 419, + 624 + ], + "score": 0.78, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 613, + 459, + 627 + ], + "score": 1.0, + "content": "has rank", + "type": "text" + }, + { + "bbox": [ + 459, + 615, + 470, + 625 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 613, + 506, + 627 + ], + "score": 1.0, + "content": "and the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 624, + 315, + 637 + ], + "spans": [ + { + "bbox": [ + 106, + 625, + 117, + 636 + ], + "score": 0.86, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 117, + 624, + 200, + 637 + ], + "score": 1.0, + "content": "-th singular value of", + "type": "text" + }, + { + "bbox": [ + 200, + 626, + 208, + 635 + ], + "score": 0.69, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 624, + 292, + 637 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + }, + { + "bbox": [ + 293, + 625, + 310, + 636 + ], + "score": 0.9, + "content": "\\dot { \\alpha } \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 624, + 315, + 637 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37.5, + "bbox_fs": [ + 105, + 613, + 506, + 637 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 648, + 504, + 672 + ], + "lines": [ + { + "bbox": [ + 105, + 647, + 505, + 661 + ], + "spans": [ + { + "bbox": [ + 105, + 647, + 190, + 661 + ], + "score": 1.0, + "content": "Proof. 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For any", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 429, + 504, + 446 + ], + "spans": [ + { + "bbox": [ + 104, + 429, + 151, + 446 + ], + "score": 1.0, + "content": "unit vector", + "type": "text" + }, + { + "bbox": [ + 152, + 432, + 186, + 443 + ], + "score": 0.92, + "content": "u \\in \\mathbb { R } ^ { k _ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 429, + 230, + 446 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 230, + 431, + 315, + 443 + ], + "score": 0.91, + "content": "[ \\Breve { \\boldsymbol { u } } ^ { \\top } \\boldsymbol { C } \\boldsymbol { F } ] _ { i i } = [ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { i i }", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 429, + 348, + 446 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 348, + 433, + 353, + 442 + ], + "score": 0.78, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 429, + 371, + 446 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 371, + 432, + 504, + 444 + ], + "score": 0.9, + "content": "[ u ^ { \\top } C \\dot { F } ] _ { i j } = [ u ^ { \\top } C ] _ { i j } + [ u ^ { \\top } C ] _ { j i }", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 443, + 506, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 138, + 457 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 138, + 444, + 162, + 456 + ], + "score": 0.89, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 443, + 226, + 457 + ], + "score": 1.0, + "content": ". We also know", + "type": "text" + }, + { + "bbox": [ + 227, + 444, + 307, + 456 + ], + "score": 0.93, + "content": "[ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { i j } = [ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { j i }", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 443, + 324, + 457 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 324, + 445, + 347, + 456 + ], + "score": 0.9, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 443, + 494, + 457 + ], + "score": 1.0, + "content": ". Thus, we know for any unit vector", + "type": "text" + }, + { + "bbox": [ + 495, + 447, + 501, + 454 + ], + "score": 0.73, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 443, + 506, + 457 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 455, + 348, + 470 + ], + "spans": [ + { + "bbox": [ + 107, + 456, + 189, + 469 + ], + "score": 0.92, + "content": "\\| u ^ { \\top } C F \\| \\geq \\| u ^ { \\top } C \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 455, + 252, + 470 + ], + "score": 1.0, + "content": ", which implies", + "type": "text" + }, + { + "bbox": [ + 252, + 457, + 344, + 469 + ], + "score": 0.91, + "content": "\\sigma _ { \\mathrm { m i n } } ( C F ) \\geq \\sigma _ { \\mathrm { m i n } } ( C )", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 455, + 348, + 470 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5 + }, + { + "type": "text", + "bbox": [ + 106, + 473, + 505, + 507 + ], + "lines": [ + { + "bbox": [ + 105, + 472, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 344, + 486 + ], + "score": 1.0, + "content": "Finally, since in the beginning we have proved that matrix", + "type": "text" + }, + { + "bbox": [ + 345, + 474, + 353, + 483 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 472, + 392, + 486 + ], + "score": 1.0, + "content": "has rank", + "type": "text" + }, + { + "bbox": [ + 392, + 474, + 403, + 485 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 472, + 422, + 486 + ], + "score": 1.0, + "content": ", the", + "type": "text" + }, + { + "bbox": [ + 422, + 474, + 433, + 485 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 472, + 505, + 486 + ], + "score": 1.0, + "content": "-th singular value", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 305, + 497 + ], + "score": 1.0, + "content": "is exactly the smallest non-zero singular value of", + "type": "text" + }, + { + "bbox": [ + 306, + 485, + 314, + 495 + ], + "score": 0.83, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 484, + 484, + 497 + ], + "score": 1.0, + "content": ". Denote the smallest non-zero singular of", + "type": "text" + }, + { + "bbox": [ + 484, + 485, + 493, + 495 + ], + "score": 0.84, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "as", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 489, + 185, + 514 + ], + "spans": [ + { + "bbox": [ + 106, + 495, + 142, + 508 + ], + "score": 0.92, + "content": "\\sigma _ { \\mathrm { m i n } } ^ { + } ( T ) \\dot { }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 489, + 185, + 514 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28 + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 513, + 385, + 559 + ], + "lines": [ + { + "bbox": [ + 226, + 513, + 385, + 559 + ], + "spans": [ + { + "bbox": [ + 226, + 513, + 385, + 559 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { \\sigma _ { k _ { 2 } } ( T ) = \\sigma _ { \\operatorname* { m i n } } ^ { + } ( T ) } \\\\ & { \\qquad \\quad \\geq \\sigma _ { \\operatorname* { m i n } } ( M ) \\sigma _ { \\operatorname* { m i n } } ( B ) \\sigma _ { \\operatorname* { m i n } } ( C F ) } \\\\ & { \\qquad \\quad \\geq \\alpha \\beta ^ { 2 } , } \\end{array}", + "type": "interline_equation", + "image_path": "5c397189faaf2a4e6d987439c0dfce8a8968419ab712c6e328e646ededa1079c.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 226, + 513, + 385, + 528.3333333333334 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 226, + 528.3333333333334, + 385, + 543.6666666666667 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 226, + 543.6666666666667, + 385, + 559.0000000000001 + ], + "spans": [], + "index": 32 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 564, + 413, + 576 + ], + "lines": [ + { + "bbox": [ + 106, + 563, + 414, + 577 + ], + "spans": [ + { + "bbox": [ + 106, + 563, + 286, + 577 + ], + "score": 1.0, + "content": "where the first inequality holds because both", + "type": "text" + }, + { + "bbox": [ + 287, + 565, + 299, + 574 + ], + "score": 0.85, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 563, + 317, + 577 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 317, + 565, + 326, + 574 + ], + "score": 0.84, + "content": "B", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 563, + 414, + 577 + ], + "score": 1.0, + "content": "has full column rank.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33 + }, + { + "type": "title", + "bbox": [ + 107, + 590, + 263, + 604 + ], + "lines": [ + { + "bbox": [ + 105, + 589, + 262, + 606 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 218, + 606 + ], + "score": 1.0, + "content": "B.1.2 UPPERBOUNDING", + "type": "text" + }, + { + "bbox": [ + 218, + 590, + 262, + 604 + ], + "score": 0.85, + "content": "\\Vert \\hat { T } - T \\Vert _ { F }", + "type": "inline_equation" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 106, + 612, + 505, + 658 + ], + "lines": [ + { + "bbox": [ + 105, + 611, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 105, + 612, + 383, + 626 + ], + "score": 1.0, + "content": "In this section, we prove that given polynomial number of samples,", + "type": "text" + }, + { + "bbox": [ + 383, + 611, + 428, + 625 + ], + "score": 0.95, + "content": "\\Vert \\hat { T } - T \\Vert _ { F }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 612, + 505, + 626 + ], + "score": 1.0, + "content": "is small with high", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 625, + 505, + 636 + ], + "spans": [ + { + "bbox": [ + 105, + 625, + 505, + 636 + ], + "score": 1.0, + "content": "probability. We do this by standard matrix concentration inequalities. Note that our requirements", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 635, + 505, + 647 + ], + "spans": [ + { + "bbox": [ + 106, + 635, + 172, + 647 + ], + "score": 1.0, + "content": "on the norm of", + "type": "text" + }, + { + "bbox": [ + 172, + 637, + 179, + 645 + ], + "score": 0.74, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 635, + 434, + 647 + ], + "score": 1.0, + "content": "is just for convenience, and the same proof works as long as", + "type": "text" + }, + { + "bbox": [ + 434, + 637, + 441, + 645 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 635, + 505, + 647 + ], + "score": 1.0, + "content": "has reasonable", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 646, + 242, + 658 + ], + "spans": [ + { + "bbox": [ + 106, + 646, + 242, + 658 + ], + "score": 1.0, + "content": "tail-behavior (e.g. sub-Gaussian).", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 36.5 + }, + { + "type": "text", + "bbox": [ + 105, + 660, + 504, + 691 + ], + "lines": [ + { + "bbox": [ + 105, + 659, + 506, + 676 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 210, + 676 + ], + "score": 1.0, + "content": "Lemma 15. Assume that", + "type": "text" + }, + { + "bbox": [ + 211, + 661, + 336, + 673 + ], + "score": 0.91, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 659, + 354, + 676 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 355, + 660, + 451, + 674 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 659, + 506, + 676 + ], + "score": 1.0, + "content": ", then for any", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 668, + 504, + 694 + ], + "spans": [ + { + "bbox": [ + 106, + 676, + 141, + 689 + ], + "score": 0.9, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 668, + 175, + 694 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 176, + 677, + 218, + 688 + ], + "score": 0.9, + "content": "1 > \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 668, + 246, + 694 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 246, + 673, + 357, + 691 + ], + "score": 0.89, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 668, + 504, + 694 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we know", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 39.5 + }, + { + "type": "interline_equation", + "bbox": [ + 272, + 697, + 337, + 713 + ], + "lines": [ + { + "bbox": [ + 272, + 697, + 337, + 713 + ], + "spans": [ + { + "bbox": [ + 272, + 697, + 337, + 713 + ], + "score": 0.87, + "content": "\\| \\hat { T } - 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For the sake of contradiction, suppose that there exists non-zero vector", + "type": "text" + }, + { + "bbox": [ + 424, + 93, + 461, + 104 + ], + "score": 0.91, + "content": "a \\in \\mathbb { R } ^ { k _ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 92, + 506, + 106 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 100, + 510, + 125 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 199, + 119 + ], + "score": 0.9, + "content": "{ \\textstyle \\sum } _ { l = 1 } ^ { k _ { 2 } } a _ { l } ( C F ) _ { [ l , : ] } = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 100, + 281, + 125 + ], + "score": 1.0, + "content": ". 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Thus,", + "type": "text" + }, + { + "bbox": [ + 348, + 132, + 441, + 147 + ], + "score": 0.93, + "content": "{ \\textstyle \\sum } _ { l = 1 } ^ { k _ { 2 } } a _ { l } ( C F ) _ { [ l , : ] } = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 129, + 508, + 151 + ], + "score": 1.0, + "content": "simply implies", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 140, + 510, + 171 + ], + "spans": [ + { + "bbox": [ + 106, + 146, + 180, + 161 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\sum _ { l = 1 } ^ { k _ { 2 } } a _ { l } C _ { [ l , : ] } = 0 } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 140, + 290, + 171 + ], + "score": 1.0, + "content": ", which breaks the fact that", + "type": "text" + }, + { + "bbox": [ + 290, + 149, + 299, + 158 + ], + "score": 0.84, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 140, + 510, + 171 + ], + "score": 1.0, + "content": "is full-row rank. 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For any", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 429, + 504, + 446 + ], + "spans": [ + { + "bbox": [ + 104, + 429, + 151, + 446 + ], + "score": 1.0, + "content": "unit vector", + "type": "text" + }, + { + "bbox": [ + 152, + 432, + 186, + 443 + ], + "score": 0.92, + "content": "u \\in \\mathbb { R } ^ { k _ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 429, + 230, + 446 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 230, + 431, + 315, + 443 + ], + "score": 0.91, + "content": "[ \\Breve { \\boldsymbol { u } } ^ { \\top } \\boldsymbol { C } \\boldsymbol { F } ] _ { i i } = [ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { i i }", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 429, + 348, + 446 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 348, + 433, + 353, + 442 + ], + "score": 0.78, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 429, + 371, + 446 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 371, + 432, + 504, + 444 + ], + "score": 0.9, + "content": "[ u ^ { \\top } C \\dot { F } ] _ { i j } = [ u ^ { \\top } C ] _ { i j } + [ u ^ { \\top } C ] _ { j i }", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 443, + 506, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 138, + 457 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 138, + 444, + 162, + 456 + ], + "score": 0.89, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 443, + 226, + 457 + ], + "score": 1.0, + "content": ". We also know", + "type": "text" + }, + { + "bbox": [ + 227, + 444, + 307, + 456 + ], + "score": 0.93, + "content": "[ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { i j } = [ \\boldsymbol { u } ^ { \\top } \\boldsymbol { C } ] _ { j i }", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 443, + 324, + 457 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 324, + 445, + 347, + 456 + ], + "score": 0.9, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 443, + 494, + 457 + ], + "score": 1.0, + "content": ". Thus, we know for any unit vector", + "type": "text" + }, + { + "bbox": [ + 495, + 447, + 501, + 454 + ], + "score": 0.73, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 443, + 506, + 457 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 455, + 348, + 470 + ], + "spans": [ + { + "bbox": [ + 107, + 456, + 189, + 469 + ], + "score": 0.92, + "content": "\\| u ^ { \\top } C F \\| \\geq \\| u ^ { \\top } C \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 455, + 252, + 470 + ], + "score": 1.0, + "content": ", which implies", + "type": "text" + }, + { + "bbox": [ + 252, + 457, + 344, + 469 + ], + "score": 0.91, + "content": "\\sigma _ { \\mathrm { m i n } } ( C F ) \\geq \\sigma _ { \\mathrm { m i n } } ( C )", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 455, + 348, + 470 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5, + "bbox_fs": [ + 104, + 418, + 506, + 470 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 473, + 505, + 507 + ], + "lines": [ + { + "bbox": [ + 105, + 472, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 344, + 486 + ], + "score": 1.0, + "content": "Finally, since in the beginning we have proved that matrix", + "type": "text" + }, + { + "bbox": [ + 345, + 474, + 353, + 483 + ], + "score": 0.82, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 472, + 392, + 486 + ], + "score": 1.0, + "content": "has rank", + "type": "text" + }, + { + "bbox": [ + 392, + 474, + 403, + 485 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 472, + 422, + 486 + ], + "score": 1.0, + "content": ", the", + "type": "text" + }, + { + "bbox": [ + 422, + 474, + 433, + 485 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 472, + 505, + 486 + ], + "score": 1.0, + "content": "-th singular value", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 305, + 497 + ], + "score": 1.0, + "content": "is exactly the smallest non-zero singular value of", + "type": "text" + }, + { + "bbox": [ + 306, + 485, + 314, + 495 + ], + "score": 0.83, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 484, + 484, + 497 + ], + "score": 1.0, + "content": ". Denote the smallest non-zero singular of", + "type": "text" + }, + { + "bbox": [ + 484, + 485, + 493, + 495 + ], + "score": 0.84, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "as", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 489, + 185, + 514 + ], + "spans": [ + { + "bbox": [ + 106, + 495, + 142, + 508 + ], + "score": 0.92, + "content": "\\sigma _ { \\mathrm { m i n } } ^ { + } ( T ) \\dot { }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 489, + 185, + 514 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28, + "bbox_fs": [ + 105, + 472, + 505, + 514 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 513, + 385, + 559 + ], + "lines": [ + { + "bbox": [ + 226, + 513, + 385, + 559 + ], + "spans": [ + { + "bbox": [ + 226, + 513, + 385, + 559 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { \\sigma _ { k _ { 2 } } ( T ) = \\sigma _ { \\operatorname* { m i n } } ^ { + } ( T ) } \\\\ & { \\qquad \\quad \\geq \\sigma _ { \\operatorname* { m i n } } ( M ) \\sigma _ { \\operatorname* { m i n } } ( B ) \\sigma _ { \\operatorname* { m i n } } ( C F ) } \\\\ & { \\qquad \\quad \\geq \\alpha \\beta ^ { 2 } , } \\end{array}", + "type": "interline_equation", + "image_path": "5c397189faaf2a4e6d987439c0dfce8a8968419ab712c6e328e646ededa1079c.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 226, + 513, + 385, + 528.3333333333334 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 226, + 528.3333333333334, + 385, + 543.6666666666667 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 226, + 543.6666666666667, + 385, + 559.0000000000001 + ], + "spans": [], + "index": 32 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 564, + 413, + 576 + ], + "lines": [ + { + "bbox": [ + 106, + 563, + 414, + 577 + ], + "spans": [ + { + "bbox": [ + 106, + 563, + 286, + 577 + ], + "score": 1.0, + "content": "where the first inequality holds because both", + "type": "text" + }, + { + "bbox": [ + 287, + 565, + 299, + 574 + ], + "score": 0.85, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 563, + 317, + 577 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 317, + 565, + 326, + 574 + ], + "score": 0.84, + "content": "B", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 563, + 414, + 577 + ], + "score": 1.0, + "content": "has full column rank.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33, + "bbox_fs": [ + 106, + 563, + 414, + 577 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 590, + 263, + 604 + ], + "lines": [ + { + "bbox": [ + 105, + 589, + 262, + 606 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 218, + 606 + ], + "score": 1.0, + "content": "B.1.2 UPPERBOUNDING", + "type": "text" + }, + { + "bbox": [ + 218, + 590, + 262, + 604 + ], + "score": 0.85, + "content": "\\Vert \\hat { T } - T \\Vert _ { F }", + "type": "inline_equation" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 106, + 612, + 505, + 658 + ], + "lines": [ + { + "bbox": [ + 105, + 611, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 105, + 612, + 383, + 626 + ], + "score": 1.0, + "content": "In this section, we prove that given polynomial number of samples,", + "type": "text" + }, + { + "bbox": [ + 383, + 611, + 428, + 625 + ], + "score": 0.95, + "content": "\\Vert \\hat { T } - T \\Vert _ { F }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 612, + 505, + 626 + ], + "score": 1.0, + "content": "is small with high", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 625, + 505, + 636 + ], + "spans": [ + { + "bbox": [ + 105, + 625, + 505, + 636 + ], + "score": 1.0, + "content": "probability. We do this by standard matrix concentration inequalities. Note that our requirements", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 635, + 505, + 647 + ], + "spans": [ + { + "bbox": [ + 106, + 635, + 172, + 647 + ], + "score": 1.0, + "content": "on the norm of", + "type": "text" + }, + { + "bbox": [ + 172, + 637, + 179, + 645 + ], + "score": 0.74, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 635, + 434, + 647 + ], + "score": 1.0, + "content": "is just for convenience, and the same proof works as long as", + "type": "text" + }, + { + "bbox": [ + 434, + 637, + 441, + 645 + ], + "score": 0.76, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 635, + 505, + 647 + ], + "score": 1.0, + "content": "has reasonable", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 646, + 242, + 658 + ], + "spans": [ + { + "bbox": [ + 106, + 646, + 242, + 658 + ], + "score": 1.0, + "content": "tail-behavior (e.g. sub-Gaussian).", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 36.5, + "bbox_fs": [ + 105, + 611, + 505, + 658 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 660, + 504, + 691 + ], + "lines": [ + { + "bbox": [ + 105, + 659, + 506, + 676 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 210, + 676 + ], + "score": 1.0, + "content": "Lemma 15. Assume that", + "type": "text" + }, + { + "bbox": [ + 211, + 661, + 336, + 673 + ], + "score": 0.91, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 659, + 354, + 676 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 355, + 660, + 451, + 674 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 659, + 506, + 676 + ], + "score": 1.0, + "content": ", then for any", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 668, + 504, + 694 + ], + "spans": [ + { + "bbox": [ + 106, + 676, + 141, + 689 + ], + "score": 0.9, + "content": "\\epsilon \\leq \\gamma / 2 ,", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 668, + 175, + 694 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 176, + 677, + 218, + 688 + ], + "score": 0.9, + "content": "1 > \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 668, + 246, + 694 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 246, + 673, + 357, + 691 + ], + "score": 0.89, + "content": "\\begin{array} { r } { O ( \\frac { d ^ { 3 } \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 668, + 504, + 694 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we know", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 39.5, + "bbox_fs": [ + 105, + 659, + 506, + 694 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 272, + 697, + 337, + 713 + ], + "lines": [ + { + "bbox": [ + 272, + 697, + 337, + 713 + ], + "spans": [ + { + "bbox": [ + 272, + 697, + 337, + 713 + ], + "score": 0.87, + "content": "\\| \\hat { T } - T \\| _ { F } \\leq \\epsilon ,", + "type": "interline_equation", + "image_path": "bb0565db696f574bb7261888426f6c7838272ed5d4271510367c901a0fde288d.jpg" + } + ] + } + ], + "index": 41, + "virtual_lines": [ + { + "bbox": [ + 272, + 697, + 337, + 713 + ], + "spans": [], + "index": 41 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 718, + 230, + 730 + ], + "lines": [ + { + "bbox": [ + 105, + 717, + 231, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 717, + 204, + 732 + ], + "score": 1.0, + "content": "with probability at least", + "type": "text" + }, + { + "bbox": [ + 204, + 719, + 227, + 729 + ], + "score": 0.86, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 717, + 231, + 732 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 42, + "bbox_fs": [ + 105, + 717, + 231, + 732 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 80, + 505, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 80, + 272, + 96 + ], + "score": 1.0, + "content": "Proof. In order to get an upper bound for", + "type": "text" + }, + { + "bbox": [ + 273, + 81, + 315, + 95 + ], + "score": 0.93, + "content": "\\| { \\hat { T } } - T \\| _ { F }", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 80, + 390, + 96 + ], + "score": 1.0, + "content": ", we first show that", + "type": "text" + }, + { + "bbox": [ + 390, + 81, + 431, + 95 + ], + "score": 0.93, + "content": "\\Vert \\hat { T } - T \\Vert _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 80, + 505, + 96 + ], + "score": 1.0, + "content": "is upper bounded.", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 91, + 147, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 91, + 147, + 106 + ], + "score": 1.0, + "content": "We know", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "interline_equation", + "bbox": [ + 203, + 108, + 408, + 156 + ], + "lines": [ + { + "bbox": [ + 203, + 108, + 408, + 156 + ], + "spans": [ + { + "bbox": [ + 203, + 108, + 408, + 156 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\| T - 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\\widetilde { T } | \\operatorname* { m e s } ^ { * } ( | U | ) | = } & { \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T \\nabla i - \\widetilde { T } | \\nabla i ) - \\widetilde { T } \\mathrm { e n } ^ { * } ( | U | ) } \\\\ & { \\leq \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | \\nabla i - \\widetilde { T } | \\langle u ^ { ( i ) } \\rangle - \\widetilde { T } ( u ^ { ( k ) } \\rangle ) | } \\\\ & { \\leq \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | \\nabla i - \\widetilde { T } | \\langle u ^ { ( i ) } \\rangle - \\widetilde { T } ( u ^ { ( k ) } \\rangle | } \\\\ & { < ( \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } | \\nabla i - \\widetilde { T } | \\nabla i ) } \\\\ & { < ( \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } | T ( u ^ { ( k ) } - \\widetilde { T } ( u ) | ) | } \\\\ & { \\leq \\widetilde { T } \\overline { { \\operatorname* { m a x } } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T \\nabla i - \\widetilde { T } ( u ^ { ( k ) } | ) | } \\\\ & \\leq \\widetilde { T } \\overline { { \\operatorname* { m a x } } } \\underset { i = \\varrho } \\end{array}", + "type": "interline_equation", + "image_path": "2992ac200df2bcd7c36da3f324e95edd88e5c98dea6ccd6f7b3e731153ad2ed2.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 135, + 192, + 475, + 264.6666666666667 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 135, + 264.6666666666667, + 475, + 337.33333333333337 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 135, + 337.33333333333337, + 475, + 410.00000000000006 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 417, + 504, + 444 + ], + "lines": [ + { + "bbox": [ + 105, + 415, + 506, + 432 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 134, + 432 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 416, + 222, + 430 + ], + "score": 0.93, + "content": "{ \\hat { f } } ( u ) = { \\hat { T } } \\mathrm { v e c } ^ { * } ( u u ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 222, + 415, + 506, + 432 + ], + "score": 1.0, + "content": "and the fourth inequality uses the Cauchy-Schwarz inequality. 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In order to get an upper bound for", + "type": "text" + }, + { + "bbox": [ + 273, + 81, + 315, + 95 + ], + "score": 0.93, + "content": "\\| { \\hat { T } } - T \\| _ { F }", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 80, + 390, + 96 + ], + "score": 1.0, + "content": ", we first show that", + "type": "text" + }, + { + "bbox": [ + 390, + 81, + 431, + 95 + ], + "score": 0.93, + "content": "\\Vert \\hat { T } - T \\Vert _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 80, + 505, + 96 + ], + "score": 1.0, + "content": "is upper bounded.", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 91, + 147, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 91, + 147, + 106 + ], + "score": 1.0, + "content": "We know", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 105, + 80, + 505, + 106 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 203, + 108, + 408, + 156 + ], + "lines": [ + { + "bbox": [ + 203, + 108, + 408, + 156 + ], + "spans": [ + { + "bbox": [ + 203, + 108, + 408, + 156 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\| T - 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\\widetilde { T } | \\operatorname* { m e s } ^ { * } ( | U | ) | = } & { \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T \\nabla i - \\widetilde { T } | \\nabla i ) - \\widetilde { T } \\mathrm { e n } ^ { * } ( | U | ) } \\\\ & { \\leq \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | \\nabla i - \\widetilde { T } | \\langle u ^ { ( i ) } \\rangle - \\widetilde { T } ( u ^ { ( k ) } \\rangle ) | } \\\\ & { \\leq \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | \\nabla i - \\widetilde { T } | \\langle u ^ { ( i ) } \\rangle - \\widetilde { T } ( u ^ { ( k ) } \\rangle | } \\\\ & { < ( \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } | \\nabla i - \\widetilde { T } | \\nabla i ) } \\\\ & { < ( \\underset { \\varrho \\in \\mathbb { R } _ { \\varrho } ^ { k } ( \\cdot , \\mathbb { R } ) } { \\sum \\operatorname* { m a x } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } | T ( u ^ { ( k ) } - \\widetilde { T } ( u ) | ) | } \\\\ & { \\leq \\widetilde { T } \\overline { { \\operatorname* { m a x } } } \\underset { i = \\varrho } { \\overset { \\mathrm { i n } } { \\sum } } ( | T \\nabla i - \\widetilde { T } ( u ^ { ( k ) } | ) | } \\\\ & \\leq \\widetilde { T } \\overline { { \\operatorname* { m a x } } } \\underset { i = \\varrho } \\end{array}", + "type": "interline_equation", + "image_path": "2992ac200df2bcd7c36da3f324e95edd88e5c98dea6ccd6f7b3e731153ad2ed2.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 135, + 192, + 475, + 264.6666666666667 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 135, + 264.6666666666667, + 475, + 337.33333333333337 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 135, + 337.33333333333337, + 475, + 410.00000000000006 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 417, + 504, + 444 + ], + "lines": [ + { + "bbox": [ + 105, + 415, + 506, + 432 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 134, + 432 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 416, + 222, + 430 + ], + "score": 0.93, + "content": "{ \\hat { f } } ( u ) = { \\hat { T } } \\mathrm { v e c } ^ { * } ( u u ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 222, + 415, + 506, + 432 + ], + "score": 1.0, + "content": "and the fourth inequality uses the Cauchy-Schwarz inequality. 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1 } x ) \\cdot ( x \\otimes x ) \\big ] - \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] } \\\\ & { \\qquad + \\Big ( \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] - 2 \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { { { \\mathbb E } } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { { { \\mathbb E } } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { { { \\mathbb E } } } [ x \\otimes x ] . } \\end{array}", + "type": "interline_equation", + "image_path": "dac625c62f11a650b25749cee326b814732e85479abfc14bdeb5f9478315980f.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 146, + 506, + 464, + 519.3333333333334 + ], + "spans": [], + "index": 16 + }, + { + "bbox": [ + 146, + 519.3333333333334, + 464, + 532.6666666666667 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 146, + 532.6666666666667, + 464, + 546.0000000000001 + ], + "spans": [], + "index": 18 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 550, + 153, + 562 + ], + "lines": [ + { + "bbox": [ + 105, + 550, + 154, + 562 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 154, + 562 + ], + "score": 1.0, + "content": "Notice that", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19, + "bbox_fs": [ + 105, + 550, + 154, + 562 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 564, + 505, + 589 + ], + "lines": [ + { + "bbox": [ + 111, + 564, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 111, + 564, + 505, + 589 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 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1 } \\| \\| } \\\\ & { \\leq 2 \\Big ( \\frac { 2 \\sqrt { 2 } \\epsilon ^ { 3 } } { \\gamma ^ { 2 } } + \\frac { 2 \\| ^ { 3 } ( \\Gamma ^ { \\top } \\Gamma \\| _ { \\sqrt { 1 } } \\sqrt { K } + F _ { 2 } ) \\epsilon } { \\gamma } + \\frac { 8 \\sqrt { 2 } \\Gamma ^ { 4 } ( \\Gamma \\| _ { \\sqrt { 1 } } \\sqrt { K } + F _ { 2 } ) ^ { 2 } \\epsilon } { \\gamma ^ { 2 } } + \\frac { 2 \\Gamma ( \\Gamma P _ { 1 } \\sqrt { K } + F _ { 2 } ) \\epsilon } { \\gamma } } \\\\ & \\quad + \\frac { 4 \\sqrt { 2 } \\Gamma ^ { 3 } ( \\Gamma P _ { 1 } \\sqrt { K } + F _ { 2 } ) \\epsilon ^ { 2 } } { \\gamma ^ { 2 } } \\end{array}", + "type": "interline_equation", + "image_path": "4411be09e93f983be534a731aa91addc193a4cd57d072d7011424363ec8afaf5.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 102, + 490, + 500, + 543.3333333333334 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 102, + 543.3333333333334, + 500, + 596.6666666666667 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 102, + 596.6666666666667, + 500, + 650.0000000000001 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 655, + 381, + 673 + ], + "lines": [ + { + "bbox": [ + 100, + 649, + 387, + 676 + ], + "spans": [ + { + "bbox": [ + 100, + 649, + 155, + 676 + ], + "score": 1.0, + "content": "Thus, given", + "type": "text" + }, + { + "bbox": [ + 156, + 655, + 260, + 673 + ], + "score": 0.93, + "content": "\\begin{array} { r } { O ( \\frac { \\Gamma ^ { 1 4 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 6 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 649, + 387, + 676 + ], + "score": 1.0, + "content": "number of samples, we know", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 675, + 514, + 721 + ], + "lines": [ + { + "bbox": [ + 111, + 675, + 514, + 721 + ], + "spans": [ + { + "bbox": [ + 111, + 675, + 514, + 721 + ], + "score": 0.84, + "content": "\\begin{array} { r l } & { \\left\\| 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) \\cdot ( \\hat { \\mathbb { E } } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 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Since", + "type": "text" + }, + { + "bbox": [ + 161, + 509, + 169, + 518 + ], + "score": 0.81, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 169, + 507, + 314, + 521 + ], + "score": 1.0, + "content": "has orthonormal columns, we have", + "type": "text" + }, + { + "bbox": [ + 314, + 507, + 373, + 520 + ], + "score": 0.93, + "content": "\\sigma _ { k } ( S S ^ { \\top } ) = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 373, + 507, + 505, + 521 + ], + "score": 1.0, + "content": ". 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Note each", + "type": "text" + }, + { + "bbox": [ + 409, + 597, + 420, + 608 + ], + "score": 0.88, + "content": "U _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 595, + 506, + 610 + ], + "score": 1.0, + "content": "can be expressed as", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 605, + 506, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 607, + 158, + 619 + ], + "score": 0.93, + "content": "A ^ { - \\top } D _ { i } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 605, + 188, + 620 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 188, + 608, + 201, + 619 + ], + "score": 0.9, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 605, + 301, + 620 + ], + "score": 1.0, + "content": "is a diagonal matrix. Let", + "type": "text" + }, + { + "bbox": [ + 301, + 609, + 310, + 619 + ], + "score": 0.87, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 605, + 329, + 620 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 329, + 608, + 352, + 618 + ], + "score": 0.9, + "content": "k \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 605, + 411, + 620 + ], + "score": 1.0, + "content": "matrix, whose", + "type": "text" + }, + { + "bbox": [ + 412, + 609, + 416, + 617 + ], + "score": 0.78, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 605, + 506, + 620 + ], + "score": 1.0, + "content": "-th column consists of", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 617, + 505, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 617, + 207, + 632 + ], + "score": 1.0, + "content": "the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 208, + 619, + 219, + 629 + ], + "score": 0.89, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 617, + 262, + 632 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 263, + 619, + 279, + 631 + ], + "score": 0.91, + "content": "Q _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 617, + 322, + 632 + ], + "score": 1.0, + "content": "equals the", + "type": "text" + }, + { + "bbox": [ + 323, + 619, + 329, + 630 + ], + "score": 0.84, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 617, + 423, + 632 + ], + "score": 1.0, + "content": "-th diagonal element of", + "type": "text" + }, + { + "bbox": [ + 423, + 619, + 436, + 630 + ], + "score": 0.89, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 617, + 457, + 632 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 457, + 618, + 505, + 631 + ], + "score": 0.88, + "content": "\\operatorname { v e c } ^ { * } ( X ) =", + "type": "inline_equation" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 629, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 106, + 629, + 206, + 641 + ], + "score": 0.81, + "content": "S R \\zeta _ { 1 } , \\bar { \\mathrm { v e c } } ^ { * } ( Y ) = S R \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 629, + 235, + 642 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 236, + 630, + 244, + 639 + ], + "score": 0.82, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 629, + 399, + 642 + ], + "score": 1.0, + "content": "is the rotation matrix in Lemma 16 and", + "type": "text" + }, + { + "bbox": [ + 399, + 630, + 422, + 641 + ], + "score": 0.74, + "content": "\\zeta _ { 1 } , \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 629, + 506, + 642 + ], + "score": 1.0, + "content": "are two independent", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 640, + 505, + 653 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 233, + 653 + ], + "score": 1.0, + "content": "standard Gaussian vectors. Let", + "type": "text" + }, + { + "bbox": [ + 233, + 640, + 314, + 652 + ], + "score": 0.91, + "content": "D _ { X } = \\mathrm { { d i a g } } ( Q R \\zeta _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 640, + 332, + 653 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 333, + 640, + 412, + 653 + ], + "score": 0.91, + "content": "D _ { Y } = \\mathrm { { d i a g } } ( Q R \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 413, + 640, + 505, + 653 + ], + "score": 1.0, + "content": ". It’s not hard to check", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 651, + 505, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 651, + 124, + 665 + ], + "score": 1.0, + "content": "that", + "type": "text" + }, + { + "bbox": [ + 124, + 651, + 201, + 664 + ], + "score": 0.93, + "content": "X = A ^ { - \\top } D _ { X } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 651, + 219, + 665 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 219, + 652, + 296, + 664 + ], + "score": 0.92, + "content": "Y = A ^ { - \\top } D _ { Y } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 296, + 651, + 389, + 665 + ], + "score": 1.0, + "content": ". Furthermore, we have", + "type": "text" + }, + { + "bbox": [ + 389, + 651, + 501, + 665 + ], + "score": 0.92, + "content": "X Y ^ { - 1 } = A ^ { - \\top } D _ { X } D _ { Y } ^ { - 1 } A ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 651, + 505, + 665 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 664, + 400, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 664, + 286, + 678 + ], + "score": 1.0, + "content": "Next, we show that the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 286, + 664, + 322, + 678 + ], + "score": 0.94, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 664, + 400, + 678 + ], + "score": 1.0, + "content": "are well separated.", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 31 + }, + { + "type": "text", + "bbox": [ + 105, + 679, + 504, + 701 + ], + "lines": [ + { + "bbox": [ + 105, + 678, + 506, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 678, + 211, + 694 + ], + "score": 1.0, + "content": "Lemma 17. 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Then, according to Lemma 35,", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 519, + 303, + 531 + ], + "spans": [ + { + "bbox": [ + 106, + 519, + 254, + 531 + ], + "score": 1.0, + "content": "we know there exists rotation matrix", + "type": "text" + }, + { + "bbox": [ + 255, + 520, + 263, + 529 + ], + "score": 0.84, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 519, + 303, + 531 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24.5, + "bbox_fs": [ + 106, + 507, + 505, + 531 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 209, + 532, + 401, + 570 + ], + "lines": [ + { + "bbox": [ + 209, + 532, + 401, + 570 + ], + "spans": [ + { + "bbox": [ + 209, + 532, + 401, + 570 + ], + "score": 0.93, + "content": "\\| \\hat { S } - S R \\| _ { F } \\leq \\frac { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } { \\sqrt { 2 ( \\sqrt { 2 } - 1 ) } \\sqrt { \\sigma _ { k } ( S S ^ { \\top } ) } } \\leq 2 \\epsilon .", + "type": "interline_equation", + "image_path": "79b464797ed4ef43772a285f983db99fd6baf3892fee359d78828f9ec02a2215.jpg" + } + ] + } + ], + "index": 26.5, + "virtual_lines": [ + { + "bbox": [ + 209, + 532, + 401, + 551.0 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 209, + 551.0, + 401, + 570.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 595, + 506, + 677 + ], + "lines": [ + { + "bbox": [ + 105, + 595, + 506, + 610 + ], + "spans": [ + { + "bbox": [ + 105, + 595, + 138, + 610 + ], + "score": 1.0, + "content": "Let the", + "type": "text" + }, + { + "bbox": [ + 138, + 597, + 145, + 606 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 595, + 195, + 610 + ], + "score": 1.0, + "content": "columns of", + "type": "text" + }, + { + "bbox": [ + 195, + 597, + 203, + 606 + ], + "score": 0.82, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 595, + 217, + 610 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 217, + 596, + 359, + 608 + ], + "score": 0.71, + "content": "\\operatorname { v e c } ^ { * } ( U _ { 1 } ) , \\operatorname { v e c } ^ { * } ( U _ { 2 } ) , \\cdot \\cdot \\cdot , \\operatorname { v e c } ^ { * } ( U _ { k } )", + "type": "inline_equation" + }, + { + "bbox": [ + 359, + 595, + 409, + 610 + ], + "score": 1.0, + "content": ". Note each", + "type": "text" + }, + { + "bbox": [ + 409, + 597, + 420, + 608 + ], + "score": 0.88, + "content": "U _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 595, + 506, + 610 + ], + "score": 1.0, + "content": "can be expressed as", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 605, + 506, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 607, + 158, + 619 + ], + "score": 0.93, + "content": "A ^ { - \\top } D _ { i } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 605, + 188, + 620 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 188, + 608, + 201, + 619 + ], + "score": 0.9, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 605, + 301, + 620 + ], + "score": 1.0, + "content": "is a diagonal matrix. Let", + "type": "text" + }, + { + "bbox": [ + 301, + 609, + 310, + 619 + ], + "score": 0.87, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 605, + 329, + 620 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 329, + 608, + 352, + 618 + ], + "score": 0.9, + "content": "k \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 605, + 411, + 620 + ], + "score": 1.0, + "content": "matrix, whose", + "type": "text" + }, + { + "bbox": [ + 412, + 609, + 416, + 617 + ], + "score": 0.78, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 605, + 506, + 620 + ], + "score": 1.0, + "content": "-th column consists of", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 617, + 505, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 617, + 207, + 632 + ], + "score": 1.0, + "content": "the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 208, + 619, + 219, + 629 + ], + "score": 0.89, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 617, + 262, + 632 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 263, + 619, + 279, + 631 + ], + "score": 0.91, + "content": "Q _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 617, + 322, + 632 + ], + "score": 1.0, + "content": "equals the", + "type": "text" + }, + { + "bbox": [ + 323, + 619, + 329, + 630 + ], + "score": 0.84, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 617, + 423, + 632 + ], + "score": 1.0, + "content": "-th diagonal element of", + "type": "text" + }, + { + "bbox": [ + 423, + 619, + 436, + 630 + ], + "score": 0.89, + "content": "D _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 617, + 457, + 632 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 457, + 618, + 505, + 631 + ], + "score": 0.88, + "content": "\\operatorname { v e c } ^ { * } ( X ) =", + "type": "inline_equation" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 629, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 106, + 629, + 206, + 641 + ], + "score": 0.81, + "content": "S R \\zeta _ { 1 } , \\bar { \\mathrm { v e c } } ^ { * } ( Y ) = S R \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 629, + 235, + 642 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 236, + 630, + 244, + 639 + ], + "score": 0.82, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 629, + 399, + 642 + ], + "score": 1.0, + "content": "is the rotation matrix in Lemma 16 and", + "type": "text" + }, + { + "bbox": [ + 399, + 630, + 422, + 641 + ], + "score": 0.74, + "content": "\\zeta _ { 1 } , \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 629, + 506, + 642 + ], + "score": 1.0, + "content": "are two independent", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 640, + 505, + 653 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 233, + 653 + ], + "score": 1.0, + "content": "standard Gaussian vectors. Let", + "type": "text" + }, + { + "bbox": [ + 233, + 640, + 314, + 652 + ], + "score": 0.91, + "content": "D _ { X } = \\mathrm { { d i a g } } ( Q R \\zeta _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 640, + 332, + 653 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 333, + 640, + 412, + 653 + ], + "score": 0.91, + "content": "D _ { Y } = \\mathrm { { d i a g } } ( Q R \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 413, + 640, + 505, + 653 + ], + "score": 1.0, + "content": ". It’s not hard to check", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 651, + 505, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 651, + 124, + 665 + ], + "score": 1.0, + "content": "that", + "type": "text" + }, + { + "bbox": [ + 124, + 651, + 201, + 664 + ], + "score": 0.93, + "content": "X = A ^ { - \\top } D _ { X } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 651, + 219, + 665 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 219, + 652, + 296, + 664 + ], + "score": 0.92, + "content": "Y = A ^ { - \\top } D _ { Y } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 296, + 651, + 389, + 665 + ], + "score": 1.0, + "content": ". Furthermore, we have", + "type": "text" + }, + { + "bbox": [ + 389, + 651, + 501, + 665 + ], + "score": 0.92, + "content": "X Y ^ { - 1 } = A ^ { - \\top } D _ { X } D _ { Y } ^ { - 1 } A ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 651, + 505, + 665 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 664, + 400, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 664, + 286, + 678 + ], + "score": 1.0, + "content": "Next, we show that the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 286, + 664, + 322, + 678 + ], + "score": 0.94, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 664, + 400, + 678 + ], + "score": 1.0, + "content": "are well separated.", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 31, + "bbox_fs": [ + 105, + 595, + 506, + 678 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 679, + 504, + 701 + ], + "lines": [ + { + "bbox": [ + 105, + 678, + 506, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 678, + 211, + 694 + ], + "score": 1.0, + "content": "Lemma 17. Assume that", + "type": "text" + }, + { + "bbox": [ + 212, + 679, + 314, + 692 + ], + "score": 0.92, + "content": "\\| A \\| \\leq P _ { 1 } , \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 678, + 374, + 694 + ], + "score": 1.0, + "content": ". Then for any", + "type": "text" + }, + { + "bbox": [ + 374, + 680, + 400, + 690 + ], + "score": 0.9, + "content": "\\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 678, + 506, + 694 + ], + "score": 1.0, + "content": "we know with probability", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 690, + 201, + 703 + ], + "spans": [ + { + "bbox": [ + 105, + 690, + 138, + 703 + ], + "score": 1.0, + "content": "at least", + "type": "text" + }, + { + "bbox": [ + 138, + 691, + 161, + 702 + ], + "score": 0.81, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 161, + 690, + 201, + 703 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35.5, + "bbox_fs": [ + 105, + 678, + 506, + 703 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 133, + 699, + 385, + 732 + ], + "lines": [ + { + "bbox": [ + 133, + 699, + 385, + 732 + ], + "spans": [ + { + "bbox": [ + 133, + 699, + 385, + 732 + ], + "score": 0.67, + "content": "\\begin{array} { r l } & { \\qquad \\quad s e p ( D _ { X } D _ { Y } ^ { - 1 } ) \\geq p o l y ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) , } \\\\ & { \\qquad s e p ( D _ { X } D _ { Y } ^ { - 1 } ) : = \\operatorname* { m i n } _ { i \\not = j } | ( D _ { X } D _ { Y } ^ { - 1 } ) _ { i i } - ( D _ { X } D _ { Y } ^ { - 1 } ) _ { j j } | . } \\end{array}", + "type": "interline_equation", + "image_path": "8aa0a453f43a4b46f775ea99b0dc74c6e9538d899da192239707405352c7bd23.jpg" + } + ] + } + ], + "index": 38, + "virtual_lines": [ + { + "bbox": [ + 133, + 699, + 385, + 710.0 + ], + "spans": [], + "index": 37 + }, + { + "bbox": [ + 133, + 710.0, + 385, + 721.0 + ], + "spans": [], + "index": 38 + }, + { + "bbox": [ + 133, + 721.0, + 385, + 732.0 + ], + "spans": [], + "index": 39 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 506, + 139 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 249, + 95 + ], + "score": 1.0, + "content": "Proof. We first show that matrix", + "type": "text" + }, + { + "bbox": [ + 249, + 83, + 259, + 94 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 81, + 379, + 95 + ], + "score": 1.0, + "content": "is well-conditioned. Since", + "type": "text" + }, + { + "bbox": [ + 379, + 82, + 461, + 94 + ], + "score": 0.92, + "content": "U _ { i } ~ = ~ A ^ { - \\top } D _ { i } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 81, + 506, + 95 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 92, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 235, + 105 + ], + "score": 0.88, + "content": "\\operatorname { v e c } ( { \\mathsf { \\bar { U } } } _ { i } ) = A ^ { - \\top } \\otimes A ^ { - \\top } \\operatorname { v e c } ( D _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 92, + 254, + 106 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 254, + 94, + 263, + 104 + ], + "score": 0.83, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 92, + 282, + 106 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 282, + 93, + 308, + 104 + ], + "score": 0.92, + "content": "k ^ { 2 } \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 92, + 440, + 106 + ], + "score": 1.0, + "content": "matrix whose columns consist of", + "type": "text" + }, + { + "bbox": [ + 441, + 94, + 473, + 105 + ], + "score": 0.62, + "content": "{ \\mathrm { v e c } } ( U _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 92, + 506, + 106 + ], + "score": 1.0, + "content": "’s. Also", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 103, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 103, + 133, + 117 + ], + "score": 1.0, + "content": "define", + "type": "text" + }, + { + "bbox": [ + 133, + 104, + 142, + 116 + ], + "score": 0.83, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 103, + 161, + 117 + ], + "score": 1.0, + "content": "as a", + "type": "text" + }, + { + "bbox": [ + 162, + 104, + 191, + 115 + ], + "score": 0.88, + "content": "k ^ { 2 } \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 103, + 299, + 117 + ], + "score": 1.0, + "content": "matrix whose columns are", + "type": "text" + }, + { + "bbox": [ + 299, + 105, + 334, + 117 + ], + "score": 0.7, + "content": "\\mathrm { v e c } ( D _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 103, + 412, + 117 + ], + "score": 1.0, + "content": "’s. Note that matrix", + "type": "text" + }, + { + "bbox": [ + 413, + 104, + 422, + 115 + ], + "score": 0.83, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 103, + 459, + 117 + ], + "score": 1.0, + "content": "only has", + "type": "text" + }, + { + "bbox": [ + 459, + 106, + 466, + 114 + ], + "score": 0.83, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 103, + 506, + 117 + ], + "score": 1.0, + "content": "non-zero", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 113, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 113, + 233, + 128 + ], + "score": 1.0, + "content": "rows, which are exactly matrix", + "type": "text" + }, + { + "bbox": [ + 234, + 116, + 242, + 126 + ], + "score": 0.81, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 113, + 390, + 128 + ], + "score": 1.0, + "content": ". With the above definition, we have", + "type": "text" + }, + { + "bbox": [ + 390, + 115, + 475, + 127 + ], + "score": 0.91, + "content": "U = \\bar { A } ^ { - \\top } \\bar { \\otimes } A ^ { - \\top } \\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 113, + 506, + 128 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 126, + 293, + 139 + ], + "spans": [ + { + "bbox": [ + 106, + 126, + 254, + 139 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( U ) \\leq \\lVert A ^ { - \\top } \\otimes \\dot { A } ^ { - \\top } \\rVert \\sigma _ { \\operatorname* { m i n } } ( \\bar { Q } )", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 126, + 293, + 139 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2 + }, + { + "type": "interline_equation", + "bbox": [ + 246, + 144, + 365, + 172 + ], + "lines": [ + { + "bbox": [ + 246, + 144, + 365, + 172 + ], + "spans": [ + { + "bbox": [ + 246, + 144, + 365, + 172 + ], + "score": 0.94, + "content": "\\sigma _ { \\operatorname* { m i n } } ( { \\bar { Q } } ) \\geq { \\frac { \\sigma _ { \\operatorname* { m i n } } ( U ) } { \\| A ^ { - \\top } \\otimes A ^ { - \\top } \\| } } .", + "type": "interline_equation", + "image_path": "1e0347445f871cc31972bf137628566ff5ee2951b24e213024ea973dfbd5906b.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 246, + 144, + 365, + 172 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 182, + 505, + 206 + ], + "lines": [ + { + "bbox": [ + 105, + 181, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 235, + 196 + ], + "score": 1.0, + "content": "Notice that a subset of rows of", + "type": "text" + }, + { + "bbox": [ + 235, + 183, + 244, + 193 + ], + "score": 0.81, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 181, + 317, + 196 + ], + "score": 1.0, + "content": "constitute matrix", + "type": "text" + }, + { + "bbox": [ + 317, + 183, + 325, + 193 + ], + "score": 0.83, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 181, + 505, + 196 + ], + "score": 1.0, + "content": ", which is an orthonormal matrix. Thus, we", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 192, + 399, + 207 + ], + "spans": [ + { + "bbox": [ + 104, + 192, + 127, + 207 + ], + "score": 1.0, + "content": "have", + "type": "text" + }, + { + "bbox": [ + 128, + 194, + 229, + 206 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( U ) \\geq \\sigma _ { \\operatorname* { m i n } } ( S ) = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 192, + 304, + 207 + ], + "score": 1.0, + "content": ". Since we assume", + "type": "text" + }, + { + "bbox": [ + 304, + 194, + 359, + 206 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 360, + 192, + 399, + 207 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6.5 + }, + { + "type": "interline_equation", + "bbox": [ + 206, + 211, + 404, + 237 + ], + "lines": [ + { + "bbox": [ + 206, + 211, + 404, + 237 + ], + "spans": [ + { + "bbox": [ + 206, + 211, + 404, + 237 + ], + "score": 0.91, + "content": "\\| A ^ { - \\top } \\otimes A ^ { - \\top } \\| = \\| A ^ { - \\top } \\| ^ { 2 } = { \\frac { 1 } { \\sigma _ { \\operatorname* { m i n } } ( A ) ^ { 2 } } } \\leq { \\frac { 1 } { \\beta ^ { 2 } } } .", + "type": "interline_equation", + "image_path": "9d3ec2a7c05a229ab4be1cd9cb5c3ad90fbffd8820a3a335ed1be9dc575164ce.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 206, + 211, + 404, + 237 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 243, + 352, + 257 + ], + "lines": [ + { + "bbox": [ + 105, + 242, + 353, + 258 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 166, + 258 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + }, + { + "bbox": [ + 167, + 243, + 226, + 257 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( \\bar { Q } ) \\geq \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 242, + 289, + 258 + ], + "score": 1.0, + "content": ", which implies", + "type": "text" + }, + { + "bbox": [ + 289, + 244, + 349, + 257 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( Q ) \\ge \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 242, + 353, + 258 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 259, + 319, + 274 + ], + "lines": [ + { + "bbox": [ + 106, + 259, + 318, + 275 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 165, + 275 + ], + "score": 1.0, + "content": "We also know", + "type": "text" + }, + { + "bbox": [ + 165, + 260, + 295, + 274 + ], + "score": 0.92, + "content": "\\| U \\| \\ge \\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) \\| \\bar { Q } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 259, + 318, + 275 + ], + "score": 1.0, + "content": ", thus", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "interline_equation", + "bbox": [ + 246, + 279, + 365, + 306 + ], + "lines": [ + { + "bbox": [ + 246, + 279, + 365, + 306 + ], + "spans": [ + { + "bbox": [ + 246, + 279, + 365, + 306 + ], + "score": 0.94, + "content": "\\lVert \\bar { Q } \\rVert \\leq \\frac { \\lVert U \\rVert } { \\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) } .", + "type": "interline_equation", + "image_path": "5d3326b39a246d85b0569b3961acaf079c1da93fe5eb3ecb447e858f0ea2c730.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 246, + 279, + 365, + 306 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 313, + 487, + 327 + ], + "lines": [ + { + "bbox": [ + 104, + 311, + 489, + 328 + ], + "spans": [ + { + "bbox": [ + 104, + 311, + 131, + 328 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 314, + 167, + 326 + ], + "score": 0.93, + "content": "\\| S \\| = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 311, + 210, + 328 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 210, + 313, + 255, + 326 + ], + "score": 0.93, + "content": "\\| U \\| \\leq { \\sqrt { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 311, + 394, + 328 + ], + "score": 1.0, + "content": ". For the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 395, + 313, + 448, + 325 + ], + "score": 0.92, + "content": "A ^ { - \\top } \\otimes A ^ { - \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 448, + 311, + 489, + 328 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "interline_equation", + "bbox": [ + 200, + 331, + 410, + 358 + ], + "lines": [ + { + "bbox": [ + 200, + 331, + 410, + 358 + ], + "spans": [ + { + "bbox": [ + 200, + 331, + 410, + 358 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) = \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) = { \\frac { 1 } { \\| A \\| ^ { 2 } } } \\geq { \\frac { 1 } { P _ { 1 } ^ { 2 } } } .", + "type": "interline_equation", + "image_path": "dcc8fb3a58ef9821d4d74cd71d6db4c4c7de58a22626bae4a48e306e89246db2.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 200, + 331, + 410, + 358 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 364, + 348, + 379 + ], + "lines": [ + { + "bbox": [ + 105, + 363, + 348, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 363, + 167, + 381 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + }, + { + "bbox": [ + 167, + 365, + 224, + 378 + ], + "score": 0.94, + "content": "\\| \\bar { Q } \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 363, + 287, + 381 + ], + "score": 1.0, + "content": ", which implies", + "type": "text" + }, + { + "bbox": [ + 288, + 365, + 344, + 379 + ], + "score": 0.94, + "content": "\\| Q \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 363, + 348, + 381 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 107, + 383, + 506, + 425 + ], + "lines": [ + { + "bbox": [ + 106, + 383, + 505, + 397 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 294, + 397 + ], + "score": 1.0, + "content": "Now, let’s prove that the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 295, + 383, + 331, + 397 + ], + "score": 0.94, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 383, + 428, + 397 + ], + "score": 1.0, + "content": "are well-separated. Let", + "type": "text" + }, + { + "bbox": [ + 428, + 383, + 441, + 397 + ], + "score": 0.9, + "content": "q _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 383, + 470, + 397 + ], + "score": 1.0, + "content": "be the", + "type": "text" + }, + { + "bbox": [ + 470, + 385, + 474, + 394 + ], + "score": 0.77, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 383, + 505, + 397 + ], + "score": 1.0, + "content": "-th row", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 394, + 505, + 415 + ], + "spans": [ + { + "bbox": [ + 104, + 394, + 145, + 415 + ], + "score": 1.0, + "content": "vector of", + "type": "text" + }, + { + "bbox": [ + 145, + 398, + 154, + 410 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 394, + 235, + 415 + ], + "score": 1.0, + "content": ". Then we know the", + "type": "text" + }, + { + "bbox": [ + 235, + 399, + 240, + 408 + ], + "score": 0.73, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 394, + 334, + 415 + ], + "score": 1.0, + "content": "-th diagonal element of", + "type": "text" + }, + { + "bbox": [ + 334, + 397, + 370, + 411 + ], + "score": 0.93, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 394, + 381, + 415 + ], + "score": 1.0, + "content": "is", + "type": "text" + }, + { + "bbox": [ + 382, + 396, + 413, + 413 + ], + "score": 0.93, + "content": "\\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle }", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 395, + 443, + 412 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 443, + 397, + 501, + 410 + ], + "score": 0.93, + "content": "\\| Q \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 395, + 505, + 412 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 411, + 286, + 426 + ], + "spans": [ + { + "bbox": [ + 106, + 411, + 142, + 426 + ], + "score": 1.0, + "content": "we have", + "type": "text" + }, + { + "bbox": [ + 142, + 412, + 199, + 426 + ], + "score": 0.95, + "content": "\\| q _ { i } \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 411, + 286, + 426 + ], + "score": 1.0, + "content": "for every row vector.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 16 + }, + { + "type": "text", + "bbox": [ + 106, + 430, + 506, + 512 + ], + "lines": [ + { + "bbox": [ + 104, + 427, + 505, + 446 + ], + "spans": [ + { + "bbox": [ + 104, + 427, + 326, + 446 + ], + "score": 1.0, + "content": "It’s not hard to show that with probability at least", + "type": "text" + }, + { + "bbox": [ + 326, + 430, + 400, + 444 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 427, + 446, + 446 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 446, + 431, + 505, + 443 + ], + "score": 0.87, + "content": "| \\langle q _ { i } , R \\zeta _ { 2 } \\rangle | ~ \\leq", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 441, + 503, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 445, + 154, + 458 + ], + "score": 0.88, + "content": "\\mathrm { p o l y } ( d , P _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 441, + 194, + 462 + ], + "score": 1.0, + "content": "for each", + "type": "text" + }, + { + "bbox": [ + 195, + 447, + 199, + 456 + ], + "score": 0.6, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 441, + 257, + 462 + ], + "score": 1.0, + "content": ". Now given", + "type": "text" + }, + { + "bbox": [ + 257, + 446, + 268, + 457 + ], + "score": 0.87, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 441, + 411, + 462 + ], + "score": 1.0, + "content": "for which this happens, we have", + "type": "text" + }, + { + "bbox": [ + 411, + 443, + 503, + 460 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\frac { \\left. q _ { i } , R \\zeta _ { 1 } \\right. } { \\left. q _ { i } , R \\zeta _ { 2 } \\right. } - \\frac { \\left. q _ { j } , R \\zeta _ { 1 } \\right. } { \\left. q _ { j } , R \\zeta _ { 2 } \\right. } = } \\end{array}", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 458, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 106, + 459, + 209, + 471 + ], + "score": 0.92, + "content": "c _ { i } \\langle q _ { i } , R \\zeta _ { 1 } \\rangle - c _ { j } \\langle q _ { j } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 458, + 239, + 473 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 240, + 461, + 261, + 472 + ], + "score": 0.9, + "content": "c _ { i } , c _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 458, + 376, + 473 + ], + "score": 1.0, + "content": "have magnitude as least pol", + "type": "text" + }, + { + "bbox": [ + 377, + 459, + 425, + 471 + ], + "score": 0.82, + "content": "\\prime ( 1 / d , 1 / P _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 458, + 455, + 473 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 456, + 460, + 505, + 471 + ], + "score": 0.86, + "content": "\\sigma _ { m i n } ( Q ) \\geq", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 469, + 504, + 487 + ], + "spans": [ + { + "bbox": [ + 106, + 471, + 118, + 483 + ], + "score": 0.86, + "content": "\\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 469, + 161, + 485 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 162, + 471, + 230, + 487 + ], + "score": 0.91, + "content": "\\| \\mathrm { P r o j } _ { q _ { j } ^ { \\perp } } q _ { i } \\| \\ge \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 469, + 357, + 485 + ], + "score": 1.0, + "content": "(because otherwise there exists", + "type": "text" + }, + { + "bbox": [ + 357, + 472, + 364, + 481 + ], + "score": 0.84, + "content": "\\lambda", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 469, + 404, + 485 + ], + "score": 1.0, + "content": "such that", + "type": "text" + }, + { + "bbox": [ + 404, + 471, + 504, + 484 + ], + "score": 0.89, + "content": "\\| ( e _ { i } + \\lambda e _ { j } ) \\| \\sigma _ { m i n } ( Q ) \\leq", + "type": "inline_equation" + } + ], + "index": 21 + }, + { + "bbox": [ + 107, + 484, + 506, + 502 + ], + "spans": [ + { + "bbox": [ + 107, + 486, + 257, + 502 + ], + "score": 0.91, + "content": "\\| ( e _ { i } + \\lambda e _ { j } ) ^ { \\top } Q \\| = \\| \\mathrm { P r o j } _ { q _ { j } ^ { \\bot } } q _ { i } \\| < \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 484, + 381, + 502 + ], + "score": 1.0, + "content": ", which is a contradiction). Let", + "type": "text" + }, + { + "bbox": [ + 381, + 486, + 501, + 502 + ], + "score": 0.92, + "content": "q _ { i , j } ^ { \\perp } = \\mathrm { P r o j } _ { q _ { j } ^ { \\perp } } q _ { i } = q _ { i } - \\lambda _ { i , j } q _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 484, + 506, + 502 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 500, + 196, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 196, + 512 + ], + "score": 1.0, + "content": "we can rewrite this as", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 20.5 + }, + { + "type": "interline_equation", + "bbox": [ + 118, + 516, + 493, + 543 + ], + "lines": [ + { + "bbox": [ + 118, + 516, + 493, + 543 + ], + "spans": [ + { + "bbox": [ + 118, + 516, + 493, + 543 + ], + "score": 0.93, + "content": "\\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle } - \\frac { \\langle q _ { j } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { j } , R \\zeta _ { 2 } \\rangle } = c _ { i } \\langle q _ { i } , R \\zeta _ { 1 } \\rangle - c _ { j } \\langle q _ { j } , R \\zeta _ { 1 } \\rangle = c _ { i } \\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle - ( c _ { j } + \\lambda _ { i , j } c _ { i } ) \\langle q _ { j } , R \\zeta _ { 1 } \\rangle .", + "type": "interline_equation", + "image_path": "b431a3e41fafddf9ec12649de593e34ac217fb2495a62df0bed20726e31f2070.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 118, + 516, + 493, + 543 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 555, + 505, + 595 + ], + "lines": [ + { + "bbox": [ + 104, + 554, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 104, + 554, + 264, + 572 + ], + "score": 1.0, + "content": "By properties of Gaussians, we know", + "type": "text" + }, + { + "bbox": [ + 265, + 556, + 308, + 570 + ], + "score": 0.94, + "content": "\\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 554, + 385, + 572 + ], + "score": 1.0, + "content": "is independent of", + "type": "text" + }, + { + "bbox": [ + 385, + 556, + 423, + 569 + ], + "score": 0.93, + "content": "\\langle q _ { j } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 423, + 554, + 506, + 572 + ], + "score": 1.0, + "content": ", so we can first fix", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 568, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 107, + 569, + 145, + 582 + ], + "score": 0.93, + "content": "\\langle q _ { j } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 568, + 397, + 585 + ], + "score": 1.0, + "content": "and apply anti-concentration of Gaussians (see Lemma 38) to", + "type": "text" + }, + { + "bbox": [ + 397, + 569, + 440, + 583 + ], + "score": 0.93, + "content": "\\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 568, + 506, + 585 + ], + "score": 1.0, + "content": ". As a result we", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 582, + 271, + 595 + ], + "spans": [ + { + "bbox": [ + 104, + 582, + 227, + 595 + ], + "score": 1.0, + "content": "know with probability at least", + "type": "text" + }, + { + "bbox": [ + 228, + 582, + 266, + 595 + ], + "score": 0.92, + "content": "1 - \\delta / k ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 582, + 271, + 595 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26 + }, + { + "type": "interline_equation", + "bbox": [ + 204, + 609, + 407, + 636 + ], + "lines": [ + { + "bbox": [ + 204, + 609, + 407, + 636 + ], + "spans": [ + { + "bbox": [ + 204, + 609, + 407, + 636 + ], + "score": 0.94, + "content": "\\Big | \\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle } - \\frac { \\langle q _ { j } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { j } , R \\zeta _ { 2 } \\rangle } \\Big | \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) .", + "type": "interline_equation", + "image_path": "5dca27e7fdef391919d6941ff17ca0674b6c8ab391a8106608ac4a76ff778f32.jpg" + } + ] + } + ], + "index": 28, + "virtual_lines": [ + { + "bbox": [ + 204, + 609, + 407, + 636 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 644, + 337, + 657 + ], + "lines": [ + { + "bbox": [ + 105, + 643, + 338, + 659 + ], + "spans": [ + { + "bbox": [ + 105, + 643, + 311, + 659 + ], + "score": 1.0, + "content": "By union bound, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 311, + 645, + 334, + 656 + ], + "score": 0.84, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 643, + 338, + 659 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 662, + 385, + 677 + ], + "lines": [ + { + "bbox": [ + 225, + 662, + 385, + 677 + ], + "spans": [ + { + "bbox": [ + 225, + 662, + 385, + 677 + ], + "score": 0.91, + "content": "\\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) .", + "type": "interline_equation", + "image_path": "45311a4bc15d9ed41ff7fe8277ae7ce01e54c7febdaf9d8167f1482e37deb548.jpg" + } + ] + } + ], + "index": 30, + "virtual_lines": [ + { + "bbox": [ + 225, + 662, + 385, + 677 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 707, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 104, + 705, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 104, + 705, + 123, + 723 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 124, + 708, + 167, + 721 + ], + "score": 0.93, + "content": "\\hat { X } \\ = \\ \\hat { S } \\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 705, + 188, + 723 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 188, + 708, + 231, + 721 + ], + "score": 0.93, + "content": "\\hat { Y } \\ = \\ \\hat { S } \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 705, + 407, + 723 + ], + "score": 1.0, + "content": ". Next, we prove that the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 407, + 708, + 436, + 720 + ], + "score": 0.9, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 705, + 506, + 723 + ], + "score": 1.0, + "content": "are close to the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 719, + 201, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 169, + 732 + ], + "score": 1.0, + "content": "eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 170, + 721, + 198, + 731 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 719, + 201, + 732 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5 + } + ], + "page_idx": 28, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 765 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 765 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 15, + "width": 15 + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 683, + 505, + 694 + ], + "lines": [ + { + "bbox": [ + 495, + 685, + 505, + 694 + ], + "spans": [ + { + "bbox": [ + 495, + 685, + 505, + 694 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 506, + 139 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 249, + 95 + ], + "score": 1.0, + "content": "Proof. We first show that matrix", + "type": "text" + }, + { + "bbox": [ + 249, + 83, + 259, + 94 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 81, + 379, + 95 + ], + "score": 1.0, + "content": "is well-conditioned. Since", + "type": "text" + }, + { + "bbox": [ + 379, + 82, + 461, + 94 + ], + "score": 0.92, + "content": "U _ { i } ~ = ~ A ^ { - \\top } D _ { i } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 81, + 506, + 95 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 92, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 235, + 105 + ], + "score": 0.88, + "content": "\\operatorname { v e c } ( { \\mathsf { \\bar { U } } } _ { i } ) = A ^ { - \\top } \\otimes A ^ { - \\top } \\operatorname { v e c } ( D _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 92, + 254, + 106 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 254, + 94, + 263, + 104 + ], + "score": 0.83, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 92, + 282, + 106 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 282, + 93, + 308, + 104 + ], + "score": 0.92, + "content": "k ^ { 2 } \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 92, + 440, + 106 + ], + "score": 1.0, + "content": "matrix whose columns consist of", + "type": "text" + }, + { + "bbox": [ + 441, + 94, + 473, + 105 + ], + "score": 0.62, + "content": "{ \\mathrm { v e c } } ( U _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 92, + 506, + 106 + ], + "score": 1.0, + "content": "’s. Also", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 103, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 103, + 133, + 117 + ], + "score": 1.0, + "content": "define", + "type": "text" + }, + { + "bbox": [ + 133, + 104, + 142, + 116 + ], + "score": 0.83, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 103, + 161, + 117 + ], + "score": 1.0, + "content": "as a", + "type": "text" + }, + { + "bbox": [ + 162, + 104, + 191, + 115 + ], + "score": 0.88, + "content": "k ^ { 2 } \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 103, + 299, + 117 + ], + "score": 1.0, + "content": "matrix whose columns are", + "type": "text" + }, + { + "bbox": [ + 299, + 105, + 334, + 117 + ], + "score": 0.7, + "content": "\\mathrm { v e c } ( D _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 103, + 412, + 117 + ], + "score": 1.0, + "content": "’s. Note that matrix", + "type": "text" + }, + { + "bbox": [ + 413, + 104, + 422, + 115 + ], + "score": 0.83, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 103, + 459, + 117 + ], + "score": 1.0, + "content": "only has", + "type": "text" + }, + { + "bbox": [ + 459, + 106, + 466, + 114 + ], + "score": 0.83, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 103, + 506, + 117 + ], + "score": 1.0, + "content": "non-zero", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 113, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 113, + 233, + 128 + ], + "score": 1.0, + "content": "rows, which are exactly matrix", + "type": "text" + }, + { + "bbox": [ + 234, + 116, + 242, + 126 + ], + "score": 0.81, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 113, + 390, + 128 + ], + "score": 1.0, + "content": ". With the above definition, we have", + "type": "text" + }, + { + "bbox": [ + 390, + 115, + 475, + 127 + ], + "score": 0.91, + "content": "U = \\bar { A } ^ { - \\top } \\bar { \\otimes } A ^ { - \\top } \\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 113, + 506, + 128 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 126, + 293, + 139 + ], + "spans": [ + { + "bbox": [ + 106, + 126, + 254, + 139 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( U ) \\leq \\lVert A ^ { - \\top } \\otimes \\dot { A } ^ { - \\top } \\rVert \\sigma _ { \\operatorname* { m i n } } ( \\bar { Q } )", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 126, + 293, + 139 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2, + "bbox_fs": [ + 105, + 81, + 506, + 139 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 246, + 144, + 365, + 172 + ], + "lines": [ + { + "bbox": [ + 246, + 144, + 365, + 172 + ], + "spans": [ + { + "bbox": [ + 246, + 144, + 365, + 172 + ], + "score": 0.94, + "content": "\\sigma _ { \\operatorname* { m i n } } ( { \\bar { Q } } ) \\geq { \\frac { \\sigma _ { \\operatorname* { m i n } } ( U ) } { \\| A ^ { - \\top } \\otimes A ^ { - \\top } \\| } } .", + "type": "interline_equation", + "image_path": "1e0347445f871cc31972bf137628566ff5ee2951b24e213024ea973dfbd5906b.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 246, + 144, + 365, + 172 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 182, + 505, + 206 + ], + "lines": [ + { + "bbox": [ + 105, + 181, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 235, + 196 + ], + "score": 1.0, + "content": "Notice that a subset of rows of", + "type": "text" + }, + { + "bbox": [ + 235, + 183, + 244, + 193 + ], + "score": 0.81, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 181, + 317, + 196 + ], + "score": 1.0, + "content": "constitute matrix", + "type": "text" + }, + { + "bbox": [ + 317, + 183, + 325, + 193 + ], + "score": 0.83, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 181, + 505, + 196 + ], + "score": 1.0, + "content": ", which is an orthonormal matrix. Thus, we", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 192, + 399, + 207 + ], + "spans": [ + { + "bbox": [ + 104, + 192, + 127, + 207 + ], + "score": 1.0, + "content": "have", + "type": "text" + }, + { + "bbox": [ + 128, + 194, + 229, + 206 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( U ) \\geq \\sigma _ { \\operatorname* { m i n } } ( S ) = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 192, + 304, + 207 + ], + "score": 1.0, + "content": ". Since we assume", + "type": "text" + }, + { + "bbox": [ + 304, + 194, + 359, + 206 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 360, + 192, + 399, + 207 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6.5, + "bbox_fs": [ + 104, + 181, + 505, + 207 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 206, + 211, + 404, + 237 + ], + "lines": [ + { + "bbox": [ + 206, + 211, + 404, + 237 + ], + "spans": [ + { + "bbox": [ + 206, + 211, + 404, + 237 + ], + "score": 0.91, + "content": "\\| A ^ { - \\top } \\otimes A ^ { - \\top } \\| = \\| A ^ { - \\top } \\| ^ { 2 } = { \\frac { 1 } { \\sigma _ { \\operatorname* { m i n } } ( A ) ^ { 2 } } } \\leq { \\frac { 1 } { \\beta ^ { 2 } } } .", + "type": "interline_equation", + "image_path": "9d3ec2a7c05a229ab4be1cd9cb5c3ad90fbffd8820a3a335ed1be9dc575164ce.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 206, + 211, + 404, + 237 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 243, + 352, + 257 + ], + "lines": [ + { + "bbox": [ + 105, + 242, + 353, + 258 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 166, + 258 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + }, + { + "bbox": [ + 167, + 243, + 226, + 257 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( \\bar { Q } ) \\geq \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 242, + 289, + 258 + ], + "score": 1.0, + "content": ", which implies", + "type": "text" + }, + { + "bbox": [ + 289, + 244, + 349, + 257 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( Q ) \\ge \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 242, + 353, + 258 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9, + "bbox_fs": [ + 105, + 242, + 353, + 258 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 259, + 319, + 274 + ], + "lines": [ + { + "bbox": [ + 106, + 259, + 318, + 275 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 165, + 275 + ], + "score": 1.0, + "content": "We also know", + "type": "text" + }, + { + "bbox": [ + 165, + 260, + 295, + 274 + ], + "score": 0.92, + "content": "\\| U \\| \\ge \\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) \\| \\bar { Q } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 259, + 318, + 275 + ], + "score": 1.0, + "content": ", thus", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10, + "bbox_fs": [ + 106, + 259, + 318, + 275 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 246, + 279, + 365, + 306 + ], + "lines": [ + { + "bbox": [ + 246, + 279, + 365, + 306 + ], + "spans": [ + { + "bbox": [ + 246, + 279, + 365, + 306 + ], + "score": 0.94, + "content": "\\lVert \\bar { Q } \\rVert \\leq \\frac { \\lVert U \\rVert } { \\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) } .", + "type": "interline_equation", + "image_path": "5d3326b39a246d85b0569b3961acaf079c1da93fe5eb3ecb447e858f0ea2c730.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 246, + 279, + 365, + 306 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 313, + 487, + 327 + ], + "lines": [ + { + "bbox": [ + 104, + 311, + 489, + 328 + ], + "spans": [ + { + "bbox": [ + 104, + 311, + 131, + 328 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 314, + 167, + 326 + ], + "score": 0.93, + "content": "\\| S \\| = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 311, + 210, + 328 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 210, + 313, + 255, + 326 + ], + "score": 0.93, + "content": "\\| U \\| \\leq { \\sqrt { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 311, + 394, + 328 + ], + "score": 1.0, + "content": ". For the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 395, + 313, + 448, + 325 + ], + "score": 0.92, + "content": "A ^ { - \\top } \\otimes A ^ { - \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 448, + 311, + 489, + 328 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12, + "bbox_fs": [ + 104, + 311, + 489, + 328 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 200, + 331, + 410, + 358 + ], + "lines": [ + { + "bbox": [ + 200, + 331, + 410, + 358 + ], + "spans": [ + { + "bbox": [ + 200, + 331, + 410, + 358 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ^ { - \\top } \\otimes A ^ { - \\top } ) = \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) = { \\frac { 1 } { \\| A \\| ^ { 2 } } } \\geq { \\frac { 1 } { P _ { 1 } ^ { 2 } } } .", + "type": "interline_equation", + "image_path": "dcc8fb3a58ef9821d4d74cd71d6db4c4c7de58a22626bae4a48e306e89246db2.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 200, + 331, + 410, + 358 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 364, + 348, + 379 + ], + "lines": [ + { + "bbox": [ + 105, + 363, + 348, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 363, + 167, + 381 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + }, + { + "bbox": [ + 167, + 365, + 224, + 378 + ], + "score": 0.94, + "content": "\\| \\bar { Q } \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 363, + 287, + 381 + ], + "score": 1.0, + "content": ", which implies", + "type": "text" + }, + { + "bbox": [ + 288, + 365, + 344, + 379 + ], + "score": 0.94, + "content": "\\| Q \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 363, + 348, + 381 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14, + "bbox_fs": [ + 105, + 363, + 348, + 381 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 383, + 506, + 425 + ], + "lines": [ + { + "bbox": [ + 106, + 383, + 505, + 397 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 294, + 397 + ], + "score": 1.0, + "content": "Now, let’s prove that the diagonal elements of", + "type": "text" + }, + { + "bbox": [ + 295, + 383, + 331, + 397 + ], + "score": 0.94, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 383, + 428, + 397 + ], + "score": 1.0, + "content": "are well-separated. Let", + "type": "text" + }, + { + "bbox": [ + 428, + 383, + 441, + 397 + ], + "score": 0.9, + "content": "q _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 383, + 470, + 397 + ], + "score": 1.0, + "content": "be the", + "type": "text" + }, + { + "bbox": [ + 470, + 385, + 474, + 394 + ], + "score": 0.77, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 383, + 505, + 397 + ], + "score": 1.0, + "content": "-th row", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 394, + 505, + 415 + ], + "spans": [ + { + "bbox": [ + 104, + 394, + 145, + 415 + ], + "score": 1.0, + "content": "vector of", + "type": "text" + }, + { + "bbox": [ + 145, + 398, + 154, + 410 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 394, + 235, + 415 + ], + "score": 1.0, + "content": ". Then we know the", + "type": "text" + }, + { + "bbox": [ + 235, + 399, + 240, + 408 + ], + "score": 0.73, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 394, + 334, + 415 + ], + "score": 1.0, + "content": "-th diagonal element of", + "type": "text" + }, + { + "bbox": [ + 334, + 397, + 370, + 411 + ], + "score": 0.93, + "content": "D _ { X } D _ { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 394, + 381, + 415 + ], + "score": 1.0, + "content": "is", + "type": "text" + }, + { + "bbox": [ + 382, + 396, + 413, + 413 + ], + "score": 0.93, + "content": "\\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle }", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 395, + 443, + 412 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 443, + 397, + 501, + 410 + ], + "score": 0.93, + "content": "\\| Q \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 395, + 505, + 412 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 411, + 286, + 426 + ], + "spans": [ + { + "bbox": [ + 106, + 411, + 142, + 426 + ], + "score": 1.0, + "content": "we have", + "type": "text" + }, + { + "bbox": [ + 142, + 412, + 199, + 426 + ], + "score": 0.95, + "content": "\\| q _ { i } \\| \\leq \\sqrt { 2 } P _ { 1 } ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 411, + 286, + 426 + ], + "score": 1.0, + "content": "for every row vector.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 16, + "bbox_fs": [ + 104, + 383, + 505, + 426 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 430, + 506, + 512 + ], + "lines": [ + { + "bbox": [ + 104, + 427, + 505, + 446 + ], + "spans": [ + { + "bbox": [ + 104, + 427, + 326, + 446 + ], + "score": 1.0, + "content": "It’s not hard to show that with probability at least", + "type": "text" + }, + { + "bbox": [ + 326, + 430, + 400, + 444 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 427, + 446, + 446 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 446, + 431, + 505, + 443 + ], + "score": 0.87, + "content": "| \\langle q _ { i } , R \\zeta _ { 2 } \\rangle | ~ \\leq", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 441, + 503, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 445, + 154, + 458 + ], + "score": 0.88, + "content": "\\mathrm { p o l y } ( d , P _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 441, + 194, + 462 + ], + "score": 1.0, + "content": "for each", + "type": "text" + }, + { + "bbox": [ + 195, + 447, + 199, + 456 + ], + "score": 0.6, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 441, + 257, + 462 + ], + "score": 1.0, + "content": ". Now given", + "type": "text" + }, + { + "bbox": [ + 257, + 446, + 268, + 457 + ], + "score": 0.87, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 441, + 411, + 462 + ], + "score": 1.0, + "content": "for which this happens, we have", + "type": "text" + }, + { + "bbox": [ + 411, + 443, + 503, + 460 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\frac { \\left. q _ { i } , R \\zeta _ { 1 } \\right. } { \\left. q _ { i } , R \\zeta _ { 2 } \\right. } - \\frac { \\left. q _ { j } , R \\zeta _ { 1 } \\right. } { \\left. q _ { j } , R \\zeta _ { 2 } \\right. } = } \\end{array}", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 458, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 106, + 459, + 209, + 471 + ], + "score": 0.92, + "content": "c _ { i } \\langle q _ { i } , R \\zeta _ { 1 } \\rangle - c _ { j } \\langle q _ { j } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 458, + 239, + 473 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 240, + 461, + 261, + 472 + ], + "score": 0.9, + "content": "c _ { i } , c _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 458, + 376, + 473 + ], + "score": 1.0, + "content": "have magnitude as least pol", + "type": "text" + }, + { + "bbox": [ + 377, + 459, + 425, + 471 + ], + "score": 0.82, + "content": "\\prime ( 1 / d , 1 / P _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 458, + 455, + 473 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 456, + 460, + 505, + 471 + ], + "score": 0.86, + "content": "\\sigma _ { m i n } ( Q ) \\geq", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 469, + 504, + 487 + ], + "spans": [ + { + "bbox": [ + 106, + 471, + 118, + 483 + ], + "score": 0.86, + "content": "\\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 469, + 161, + 485 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 162, + 471, + 230, + 487 + ], + "score": 0.91, + "content": "\\| \\mathrm { P r o j } _ { q _ { j } ^ { \\perp } } q _ { i } \\| \\ge \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 469, + 357, + 485 + ], + "score": 1.0, + "content": "(because otherwise there exists", + "type": "text" + }, + { + "bbox": [ + 357, + 472, + 364, + 481 + ], + "score": 0.84, + "content": "\\lambda", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 469, + 404, + 485 + ], + "score": 1.0, + "content": "such that", + "type": "text" + }, + { + "bbox": [ + 404, + 471, + 504, + 484 + ], + "score": 0.89, + "content": "\\| ( e _ { i } + \\lambda e _ { j } ) \\| \\sigma _ { m i n } ( Q ) \\leq", + "type": "inline_equation" + } + ], + "index": 21 + }, + { + "bbox": [ + 107, + 484, + 506, + 502 + ], + "spans": [ + { + "bbox": [ + 107, + 486, + 257, + 502 + ], + "score": 0.91, + "content": "\\| ( e _ { i } + \\lambda e _ { j } ) ^ { \\top } Q \\| = \\| \\mathrm { P r o j } _ { q _ { j } ^ { \\bot } } q _ { i } \\| < \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 484, + 381, + 502 + ], + "score": 1.0, + "content": ", which is a contradiction). Let", + "type": "text" + }, + { + "bbox": [ + 381, + 486, + 501, + 502 + ], + "score": 0.92, + "content": "q _ { i , j } ^ { \\perp } = \\mathrm { P r o j } _ { q _ { j } ^ { \\perp } } q _ { i } = q _ { i } - \\lambda _ { i , j } q _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 484, + 506, + 502 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 500, + 196, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 196, + 512 + ], + "score": 1.0, + "content": "we can rewrite this as", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 20.5, + "bbox_fs": [ + 104, + 427, + 506, + 512 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 118, + 516, + 493, + 543 + ], + "lines": [ + { + "bbox": [ + 118, + 516, + 493, + 543 + ], + "spans": [ + { + "bbox": [ + 118, + 516, + 493, + 543 + ], + "score": 0.93, + "content": "\\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle } - \\frac { \\langle q _ { j } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { j } , R \\zeta _ { 2 } \\rangle } = c _ { i } \\langle q _ { i } , R \\zeta _ { 1 } \\rangle - c _ { j } \\langle q _ { j } , R \\zeta _ { 1 } \\rangle = c _ { i } \\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle - ( c _ { j } + \\lambda _ { i , j } c _ { i } ) \\langle q _ { j } , R \\zeta _ { 1 } \\rangle .", + "type": "interline_equation", + "image_path": "b431a3e41fafddf9ec12649de593e34ac217fb2495a62df0bed20726e31f2070.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 118, + 516, + 493, + 543 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 555, + 505, + 595 + ], + "lines": [ + { + "bbox": [ + 104, + 554, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 104, + 554, + 264, + 572 + ], + "score": 1.0, + "content": "By properties of Gaussians, we know", + "type": "text" + }, + { + "bbox": [ + 265, + 556, + 308, + 570 + ], + "score": 0.94, + "content": "\\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 554, + 385, + 572 + ], + "score": 1.0, + "content": "is independent of", + "type": "text" + }, + { + "bbox": [ + 385, + 556, + 423, + 569 + ], + "score": 0.93, + "content": "\\langle q _ { j } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 423, + 554, + 506, + 572 + ], + "score": 1.0, + "content": ", so we can first fix", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 568, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 107, + 569, + 145, + 582 + ], + "score": 0.93, + "content": "\\langle q _ { j } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 568, + 397, + 585 + ], + "score": 1.0, + "content": "and apply anti-concentration of Gaussians (see Lemma 38) to", + "type": "text" + }, + { + "bbox": [ + 397, + 569, + 440, + 583 + ], + "score": 0.93, + "content": "\\langle q _ { i , j } ^ { \\perp } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 568, + 506, + 585 + ], + "score": 1.0, + "content": ". As a result we", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 582, + 271, + 595 + ], + "spans": [ + { + "bbox": [ + 104, + 582, + 227, + 595 + ], + "score": 1.0, + "content": "know with probability at least", + "type": "text" + }, + { + "bbox": [ + 228, + 582, + 266, + 595 + ], + "score": 0.92, + "content": "1 - \\delta / k ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 582, + 271, + 595 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26, + "bbox_fs": [ + 104, + 554, + 506, + 595 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 204, + 609, + 407, + 636 + ], + "lines": [ + { + "bbox": [ + 204, + 609, + 407, + 636 + ], + "spans": [ + { + "bbox": [ + 204, + 609, + 407, + 636 + ], + "score": 0.94, + "content": "\\Big | \\frac { \\langle q _ { i } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { i } , R \\zeta _ { 2 } \\rangle } - \\frac { \\langle q _ { j } , R \\zeta _ { 1 } \\rangle } { \\langle q _ { j } , R \\zeta _ { 2 } \\rangle } \\Big | \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) .", + "type": "interline_equation", + "image_path": "5dca27e7fdef391919d6941ff17ca0674b6c8ab391a8106608ac4a76ff778f32.jpg" + } + ] + } + ], + "index": 28, + "virtual_lines": [ + { + "bbox": [ + 204, + 609, + 407, + 636 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 644, + 337, + 657 + ], + "lines": [ + { + "bbox": [ + 105, + 643, + 338, + 659 + ], + "spans": [ + { + "bbox": [ + 105, + 643, + 311, + 659 + ], + "score": 1.0, + "content": "By union bound, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 311, + 645, + 334, + 656 + ], + "score": 0.84, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 643, + 338, + 659 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29, + "bbox_fs": [ + 105, + 643, + 338, + 659 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 662, + 385, + 677 + ], + "lines": [ + { + "bbox": [ + 225, + 662, + 385, + 677 + ], + "spans": [ + { + "bbox": [ + 225, + 662, + 385, + 677 + ], + "score": 0.91, + "content": "\\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta ) .", + "type": "interline_equation", + "image_path": "45311a4bc15d9ed41ff7fe8277ae7ce01e54c7febdaf9d8167f1482e37deb548.jpg" + } + ] + } + ], + "index": 30, + "virtual_lines": [ + { + "bbox": [ + 225, + 662, + 385, + 677 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 707, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 104, + 705, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 104, + 705, + 123, + 723 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 124, + 708, + 167, + 721 + ], + "score": 0.93, + "content": "\\hat { X } \\ = \\ \\hat { S } \\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 705, + 188, + 723 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 188, + 708, + 231, + 721 + ], + "score": 0.93, + "content": "\\hat { Y } \\ = \\ \\hat { S } \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 705, + 407, + 723 + ], + "score": 1.0, + "content": ". Next, we prove that the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 407, + 708, + 436, + 720 + ], + "score": 0.9, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 705, + 506, + 723 + ], + "score": 1.0, + "content": "are close to the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 719, + 201, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 169, + 732 + ], + "score": 1.0, + "content": "eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 170, + 721, + 198, + 731 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 719, + 201, + 732 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5, + "bbox_fs": [ + 104, + 705, + 506, + 732 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 79, + 506, + 156 + ], + "lines": [ + { + "bbox": [ + 104, + 79, + 504, + 97 + ], + "spans": [ + { + "bbox": [ + 104, + 79, + 221, + 97 + ], + "score": 1.0, + "content": "Lemma 12. Suppose that", + "type": "text" + }, + { + "bbox": [ + 222, + 81, + 504, + 95 + ], + "score": 0.88, + "content": "\\begin{array} { r c l } { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } & { \\leq } & { \\epsilon , \\| A \\| } \\\\ & { } & { \\geq } \\end{array} \\leq \\epsilon , \\| A \\| \\ \\leq \\ { P } _ { 1 } , \\| \\xi \\| \\ \\leq \\ P _ { 2 } , \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\ \\geq", + "type": "inline_equation" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 93, + 506, + 109 + ], + "spans": [ + { + "bbox": [ + 107, + 95, + 181, + 108 + ], + "score": 0.89, + "content": "\\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta .", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 93, + 209, + 109 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 210, + 94, + 362, + 108 + ], + "score": 0.89, + "content": "\\hat { X } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 1 } ) , \\hat { Y } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 93, + 397, + 109 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 397, + 96, + 408, + 107 + ], + "score": 0.86, + "content": "\\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 93, + 431, + 109 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 431, + 96, + 441, + 107 + ], + "score": 0.87, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 93, + 506, + 109 + ], + "score": 1.0, + "content": "are two inde-", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 104, + 105, + 506, + 119 + ], + "spans": [ + { + "bbox": [ + 104, + 105, + 278, + 119 + ], + "score": 1.0, + "content": "pendent standard Gaussian vectors. Let", + "type": "text" + }, + { + "bbox": [ + 279, + 108, + 316, + 118 + ], + "score": 0.88, + "content": "z _ { 1 } , \\cdots z _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 105, + 461, + 119 + ], + "score": 1.0, + "content": "be the normalized row vectors of", + "type": "text" + }, + { + "bbox": [ + 461, + 106, + 480, + 117 + ], + "score": 0.9, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 480, + 105, + 506, + 119 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 117, + 506, + 132 + ], + "spans": [ + { + "bbox": [ + 106, + 119, + 143, + 130 + ], + "score": 0.88, + "content": "\\hat { z } _ { 1 } , . . . , \\hat { z } _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 117, + 237, + 132 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 237, + 117, + 266, + 130 + ], + "score": 0.91, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 117, + 371, + 132 + ], + "score": 1.0, + "content": "(after sign flip). For any", + "type": "text" + }, + { + "bbox": [ + 371, + 119, + 398, + 129 + ], + "score": 0.89, + "content": "\\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 117, + 506, + 132 + ], + "score": 1.0, + "content": "and small enough \u000f, with", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 107, + 126, + 508, + 149 + ], + "spans": [ + { + "bbox": [ + 107, + 130, + 204, + 146 + ], + "score": 0.91, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 126, + 315, + 149 + ], + "score": 1.0, + "content": ") number of i.i.d. samples in", + "type": "text" + }, + { + "bbox": [ + 316, + 132, + 345, + 146 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 346, + 126, + 447, + 149 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + }, + { + "bbox": [ + 447, + 133, + 469, + 144 + ], + "score": 0.73, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 126, + 508, + 149 + ], + "score": 1.0, + "content": "over the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 144, + 456, + 157 + ], + "spans": [ + { + "bbox": [ + 106, + 144, + 167, + 157 + ], + "score": 1.0, + "content": "randomness of", + "type": "text" + }, + { + "bbox": [ + 168, + 145, + 190, + 156 + ], + "score": 0.86, + "content": "\\zeta _ { 1 } , \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 144, + 373, + 157 + ], + "score": 1.0, + "content": "and i.i.d. samples, there exists a permutation", + "type": "text" + }, + { + "bbox": [ + 373, + 144, + 415, + 156 + ], + "score": 0.93, + "content": "\\pi ( i ) \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 144, + 456, + 157 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 2.5 + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 157, + 383, + 172 + ], + "lines": [ + { + "bbox": [ + 225, + 157, + 383, + 172 + ], + "spans": [ + { + "bbox": [ + 225, + 157, + 383, + 172 + ], + "score": 0.86, + "content": "\\begin{array} { r } { \\| \\hat { z } _ { i } - z _ { \\pi [ i ] } \\| \\le p o l y ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}", + "type": "interline_equation", + "image_path": "8edf9469821371490d668fb39458486c8d129368c06e0780a5e709c12e6cbd5d.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 225, + 157, + 383, + 172 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 171, + 182, + 184 + ], + "lines": [ + { + "bbox": [ + 104, + 171, + 183, + 185 + ], + "spans": [ + { + "bbox": [ + 104, + 171, + 137, + 185 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 138, + 172, + 179, + 183 + ], + "score": 0.88, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 171, + 183, + 185 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7 + }, + { + "type": "text", + "bbox": [ + 106, + 194, + 506, + 231 + ], + "lines": [ + { + "bbox": [ + 105, + 194, + 506, + 208 + ], + "spans": [ + { + "bbox": [ + 105, + 194, + 154, + 208 + ], + "score": 1.0, + "content": "Proof. Let", + "type": "text" + }, + { + "bbox": [ + 154, + 195, + 198, + 207 + ], + "score": 0.91, + "content": "z _ { 1 } ^ { \\prime } , \\cdots , z _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 194, + 299, + 208 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 300, + 195, + 329, + 206 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 194, + 506, + 208 + ], + "score": 1.0, + "content": "(before sign flip step). Similarly define", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 107, + 203, + 506, + 226 + ], + "spans": [ + { + "bbox": [ + 107, + 208, + 150, + 220 + ], + "score": 0.87, + "content": "\\hat { z } _ { 1 } ^ { \\prime } , \\cdots , \\hat { z } _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 150, + 203, + 167, + 226 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 167, + 207, + 195, + 219 + ], + "score": 0.92, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 203, + 358, + 226 + ], + "score": 1.0, + "content": ". We first prove that the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 358, + 207, + 387, + 218 + ], + "score": 0.91, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 203, + 506, + 226 + ], + "score": 1.0, + "content": "are close to the eigenvectors", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 218, + 148, + 230 + ], + "spans": [ + { + "bbox": [ + 104, + 218, + 117, + 230 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 220, + 146, + 230 + ], + "score": 0.84, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 218, + 148, + 227 + ], + "score": 0.0, + "content": "", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 235, + 320, + 248 + ], + "lines": [ + { + "bbox": [ + 104, + 232, + 321, + 250 + ], + "spans": [ + { + "bbox": [ + 104, + 232, + 122, + 250 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 122, + 235, + 182, + 248 + ], + "score": 0.92, + "content": "{ \\hat { X } } = X + E _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 232, + 200, + 250 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 200, + 235, + 257, + 248 + ], + "score": 0.92, + "content": "\\hat { Y } = Y + E _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 232, + 321, + 250 + ], + "score": 1.0, + "content": ". Then we have", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "interline_equation", + "bbox": [ + 242, + 248, + 368, + 262 + ], + "lines": [ + { + "bbox": [ + 242, + 248, + 368, + 262 + ], + "spans": [ + { + "bbox": [ + 242, + 248, + 368, + 262 + ], + "score": 0.86, + "content": "\\hat { X } \\hat { Y } ^ { - 1 } = X Y ^ { - 1 } ( I + F ) + G ,", + "type": "interline_equation", + "image_path": "ff9afd0cbe176dd292a1f4f93f272846edc82e1bee593e39eab2867ebd0182cc.jpg" + } + ] + } + ], + "index": 12, + "virtual_lines": [ + { + "bbox": [ + 242, + 248, + 368, + 262 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 264, + 506, + 309 + ], + "lines": [ + { + "bbox": [ + 104, + 263, + 506, + 279 + ], + "spans": [ + { + "bbox": [ + 104, + 263, + 135, + 279 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 135, + 265, + 273, + 278 + ], + "score": 0.91, + "content": "F = - E _ { Y } ( I + Y ^ { - 1 } E _ { Y } ) ^ { - 1 } Y ^ { - 1 } ", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 263, + 294, + 279 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 294, + 264, + 355, + 277 + ], + "score": 0.92, + "content": "G = E _ { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 263, + 506, + 279 + ], + "score": 1.0, + "content": ". According to Lemma 34, we have", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 107, + 275, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 107, + 278, + 198, + 294 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\| \\boldsymbol { F } \\| \\le \\frac { \\| E _ { Y } \\| } { \\sigma _ { \\operatorname* { m i n } } ( Y ) - \\| E _ { Y } \\| } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 275, + 218, + 297 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 218, + 277, + 283, + 295 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\| G \\| \\le \\frac { \\| E _ { X } \\| } { \\sigma _ { \\operatorname* { m i n } } ( \\hat { Y } ) } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 275, + 467, + 297 + ], + "score": 1.0, + "content": ". In order to bound the perturbation matrices", + "type": "text" + }, + { + "bbox": [ + 468, + 279, + 486, + 291 + ], + "score": 0.92, + "content": "\\| F \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 275, + 506, + 297 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 107, + 294, + 373, + 309 + ], + "spans": [ + { + "bbox": [ + 107, + 296, + 125, + 309 + ], + "score": 0.91, + "content": "\\| G \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 295, + 221, + 309 + ], + "score": 1.0, + "content": ", we need to first bound", + "type": "text" + }, + { + "bbox": [ + 221, + 296, + 275, + 309 + ], + "score": 0.92, + "content": "\\| E _ { X } \\| , \\| E _ { Y } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 295, + 293, + 309 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 293, + 294, + 370, + 309 + ], + "score": 0.92, + "content": "\\sigma _ { \\mathrm { m i n } } ( Y ) , \\sigma _ { \\mathrm { m i n } } ( \\hat { Y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 295, + 373, + 309 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 106, + 313, + 505, + 350 + ], + "lines": [ + { + "bbox": [ + 104, + 313, + 505, + 329 + ], + "spans": [ + { + "bbox": [ + 104, + 313, + 163, + 329 + ], + "score": 1.0, + "content": "As we know,", + "type": "text" + }, + { + "bbox": [ + 164, + 313, + 295, + 327 + ], + "score": 0.92, + "content": "E _ { X } = \\hat { X } - X = ( \\hat { S } - S R ) \\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 313, + 446, + 329 + ], + "score": 1.0, + "content": ". According to Lemma 16, we have", + "type": "text" + }, + { + "bbox": [ + 446, + 313, + 505, + 327 + ], + "score": 0.92, + "content": "\\| \\hat { S } - S R \\| \\le", + "type": "inline_equation" + } + ], + "index": 16 + }, + { + "bbox": [ + 107, + 325, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 107, + 327, + 180, + 340 + ], + "score": 0.92, + "content": "\\| \\hat { S } - S R \\| _ { F } \\leq 2 \\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 325, + 338, + 342 + ], + "score": 1.0, + "content": ". We also know with probability at least", + "type": "text" + }, + { + "bbox": [ + 339, + 327, + 407, + 340 + ], + "score": 0.79, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 325, + 412, + 342 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 413, + 328, + 476, + 340 + ], + "score": 0.82, + "content": "\\| \\zeta _ { 1 } \\| \\le \\mathsf { p o l y } ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 325, + 506, + 342 + ], + "score": 1.0, + "content": ". Thus,", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 338, + 143, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 338, + 143, + 352 + ], + "score": 1.0, + "content": "we have", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17 + }, + { + "type": "interline_equation", + "bbox": [ + 190, + 350, + 420, + 366 + ], + "lines": [ + { + "bbox": [ + 190, + 350, + 420, + 366 + ], + "spans": [ + { + "bbox": [ + 190, + 350, + 420, + 366 + ], + "score": 0.88, + "content": "\\| E _ { X } \\| = \\| ( \\hat { S } - S R ) \\zeta _ { 1 } \\| \\leq \\| \\hat { S } - S R \\| \\| \\zeta _ { 1 } \\| \\leq \\mathrm { p o l y } ( \\epsilon , d ) .", + "type": "interline_equation", + "image_path": "800754763d2678772d02f38d288f3142259a1d14416f12a5ad184e5d2e6cedf2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 190, + 350, + 420, + 366 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 111, + 367, + 451, + 381 + ], + "lines": [ + { + "bbox": [ + 108, + 366, + 454, + 383 + ], + "spans": [ + { + "bbox": [ + 108, + 366, + 245, + 383 + ], + "score": 1.0, + "content": "Similarly, with probability at least", + "type": "text" + }, + { + "bbox": [ + 245, + 367, + 315, + 381 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 366, + 376, + 383 + ], + "score": 1.0, + "content": ", we also know", + "type": "text" + }, + { + "bbox": [ + 377, + 368, + 454, + 381 + ], + "score": 0.9, + "content": "\\| E _ { Y } \\| \\le \\mathtt { p o l y } ( \\epsilon , d )", + "type": "inline_equation" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 108, + 385, + 497, + 397 + ], + "lines": [ + { + "bbox": [ + 106, + 383, + 499, + 399 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 315, + 399 + ], + "score": 1.0, + "content": "Now, we lower bound the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 316, + 387, + 326, + 396 + ], + "score": 0.85, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 383, + 344, + 399 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 344, + 386, + 353, + 396 + ], + "score": 0.8, + "content": "Y", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 383, + 381, + 399 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 382, + 384, + 460, + 397 + ], + "score": 0.93, + "content": "X = A ^ { - \\top } D _ { X } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 383, + 499, + 399 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "interline_equation", + "bbox": [ + 236, + 397, + 375, + 466 + ], + "lines": [ + { + "bbox": [ + 236, + 397, + 375, + 466 + ], + "spans": [ + { + "bbox": [ + 236, + 397, + 375, + 466 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { { \\sigma } _ { \\operatorname* { m i n } } ( X ) \\geq { \\sigma } _ { \\operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) } \\\\ & { \\qquad = \\displaystyle \\frac { 1 } { \\| A \\| ^ { 2 } } { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) } \\\\ & { \\qquad \\geq \\displaystyle \\frac { 1 } { P _ { 1 } ^ { 2 } } { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "8c3ed5431b1b8a04aea5cae323b859ab4901cfe4a27f99d96ae1817430e22fde.jpg" + } + ] + } + ], + "index": 22.5, + "virtual_lines": [ + { + "bbox": [ + 236, + 397, + 375, + 431.5 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 236, + 431.5, + 375, + 466.0 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 466, + 506, + 536 + ], + "lines": [ + { + "bbox": [ + 106, + 466, + 506, + 479 + ], + "spans": [ + { + "bbox": [ + 106, + 466, + 132, + 479 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 467, + 149, + 478 + ], + "score": 0.9, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 150, + 466, + 506, + 479 + ], + "score": 1.0, + "content": "is a diagonal matrix, its smallest singular value equals the smallest absolute value of", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 476, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 328, + 490 + ], + "score": 1.0, + "content": "its diagonal element. Recall each diagonal element of", + "type": "text" + }, + { + "bbox": [ + 328, + 478, + 345, + 488 + ], + "score": 0.88, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 476, + 357, + 490 + ], + "score": 1.0, + "content": "is", + "type": "text" + }, + { + "bbox": [ + 357, + 478, + 394, + 489 + ], + "score": 0.93, + "content": "\\langle q _ { i } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 476, + 506, + 490 + ], + "score": 1.0, + "content": ", which follows a Gaussian", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 487, + 506, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 308, + 501 + ], + "score": 1.0, + "content": "distribution whose standard deviation is at least", + "type": "text" + }, + { + "bbox": [ + 308, + 488, + 356, + 500 + ], + "score": 0.89, + "content": "\\left\\| q _ { i } \\right\\| \\ge \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 356, + 487, + 506, + 501 + ], + "score": 1.0, + "content": ". By anti-concentration property of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 498, + 506, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 260, + 513 + ], + "score": 1.0, + "content": "Gaussian (see Lemma 38), we know", + "type": "text" + }, + { + "bbox": [ + 261, + 500, + 360, + 511 + ], + "score": 0.89, + "content": "| \\langle q _ { i } , R \\zeta _ { 2 } \\rangle | \\ge \\Omega ( \\delta \\beta ^ { 2 } / k )", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 498, + 391, + 513 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 391, + 500, + 396, + 509 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 498, + 466, + 513 + ], + "score": 1.0, + "content": "with probability", + "type": "text" + }, + { + "bbox": [ + 467, + 499, + 501, + 511 + ], + "score": 0.94, + "content": "\\bar { 1 } - \\bar { \\delta } / 4", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 498, + 506, + 513 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 509, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 169, + 523 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + }, + { + "bbox": [ + 169, + 510, + 308, + 523 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( X ) \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 509, + 492, + 523 + ], + "score": 1.0, + "content": ". Similarly we have the same conclusion for", + "type": "text" + }, + { + "bbox": [ + 492, + 511, + 501, + 520 + ], + "score": 0.82, + "content": "Y", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 509, + 505, + 523 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 523, + 358, + 536 + ], + "spans": [ + { + "bbox": [ + 105, + 523, + 178, + 536 + ], + "score": 1.0, + "content": "For small enough", + "type": "text" + }, + { + "bbox": [ + 179, + 524, + 194, + 534 + ], + "score": 0.89, + "content": "E _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 523, + 233, + 536 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 233, + 523, + 354, + 536 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\hat { Y } ) \\geq \\sigma _ { \\operatorname* { m i n } } ( Y ) - \\| E _ { Y } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 523, + 358, + 536 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 26.5 + }, + { + "type": "text", + "bbox": [ + 106, + 539, + 506, + 585 + ], + "lines": [ + { + "bbox": [ + 104, + 538, + 505, + 553 + ], + "spans": [ + { + "bbox": [ + 104, + 538, + 225, + 553 + ], + "score": 1.0, + "content": "Thus, for small enough", + "type": "text" + }, + { + "bbox": [ + 225, + 542, + 231, + 550 + ], + "score": 0.64, + "content": "\\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 538, + 287, + 553 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 288, + 540, + 436, + 552 + ], + "score": 0.9, + "content": "\\begin{array} { r l r } { \\| { \\cal F } \\| } & { { } \\le } & { \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) _ { . } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 538, + 464, + 553 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 464, + 540, + 505, + 551 + ], + "score": 0.8, + "content": "\\| G \\| \\quad \\leq", + "type": "inline_equation" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 549, + 506, + 564 + ], + "spans": [ + { + "bbox": [ + 107, + 551, + 202, + 563 + ], + "score": 0.87, + "content": "\\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 549, + 410, + 564 + ], + "score": 1.0, + "content": ". In order to apply Lemma 33, we also need to bound", + "type": "text" + }, + { + "bbox": [ + 411, + 551, + 444, + 563 + ], + "score": 0.91, + "content": "\\kappa ( \\boldsymbol { A } ^ { - \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 549, + 462, + 564 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 463, + 551, + 501, + 563 + ], + "score": 0.74, + "content": "\\| X Y ^ { - 1 } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 549, + 506, + 564 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 104, + 559, + 501, + 577 + ], + "spans": [ + { + "bbox": [ + 104, + 559, + 132, + 577 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 562, + 207, + 576 + ], + "score": 0.88, + "content": "\\textstyle \\sigma _ { \\operatorname* { m i n } } ( { \\dot { A } } ^ { - \\top } ) \\geq { \\frac { 1 } { P _ { 1 } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 559, + 226, + 577 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 226, + 561, + 288, + 574 + ], + "score": 0.93, + "content": "\\| A ^ { - \\top } \\| \\leq 1 / \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 559, + 329, + 577 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 329, + 561, + 401, + 574 + ], + "score": 0.92, + "content": "\\kappa ( A ^ { - \\top } ) \\leq P _ { 1 } / \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 559, + 472, + 577 + ], + "score": 1.0, + "content": ". For the norm of", + "type": "text" + }, + { + "bbox": [ + 473, + 563, + 501, + 573 + ], + "score": 0.76, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 572, + 143, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 143, + 587 + ], + "score": 1.0, + "content": "we have", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31.5 + }, + { + "type": "interline_equation", + "bbox": [ + 199, + 585, + 411, + 612 + ], + "lines": [ + { + "bbox": [ + 199, + 585, + 411, + 612 + ], + "spans": [ + { + "bbox": [ + 199, + 585, + 411, + 612 + ], + "score": 0.92, + "content": "\\lVert X Y ^ { - 1 } \\rVert \\leq \\frac { \\lVert X \\rVert } { \\sigma _ { \\operatorname* { m i n } } ( Y ) } \\leq \\lVert X \\rVert \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta ) ,", + "type": "interline_equation", + "image_path": "4cda29ce5aa9c611e198d390f8a061031842c8bb4689519b97b8f09ab1db3406.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 199, + 585, + 411, + 612 + ], + "spans": [], + "index": 34 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 613, + 506, + 662 + ], + "lines": [ + { + "bbox": [ + 106, + 612, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 286, + 626 + ], + "score": 1.0, + "content": "where the second inequality holds because", + "type": "text" + }, + { + "bbox": [ + 287, + 613, + 426, + 626 + ], + "score": 0.87, + "content": "\\sigma _ { \\operatorname* { m i n } } ( Y ) \\geq \\mathrm { { p o l y } } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 427, + 612, + 480, + 626 + ], + "score": 1.0, + "content": ". Recall that", + "type": "text" + }, + { + "bbox": [ + 480, + 613, + 505, + 624 + ], + "score": 0.86, + "content": "X =", + "type": "inline_equation" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 623, + 505, + 639 + ], + "spans": [ + { + "bbox": [ + 106, + 625, + 158, + 637 + ], + "score": 0.84, + "content": "\\mathrm { m a t } ^ { * } ( S R \\zeta _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 623, + 364, + 639 + ], + "score": 1.0, + "content": ". It’s not hard to verify that with probability at least", + "type": "text" + }, + { + "bbox": [ + 364, + 625, + 434, + 637 + ], + "score": 0.89, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 623, + 473, + 639 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 473, + 625, + 505, + 637 + ], + "score": 0.9, + "content": "\\| X \\| \\leq", + "type": "inline_equation" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 635, + 506, + 650 + ], + "spans": [ + { + "bbox": [ + 105, + 635, + 126, + 650 + ], + "score": 1.0, + "content": "poly", + "type": "text" + }, + { + "bbox": [ + 126, + 637, + 138, + 648 + ], + "score": 0.44, + "content": "( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 635, + 214, + 650 + ], + "score": 1.0, + "content": ". Thus, we know", + "type": "text" + }, + { + "bbox": [ + 214, + 636, + 357, + 649 + ], + "score": 0.89, + "content": "\\| X Y ^ { - \\bar { 1 } } \\| \\le \\mathrm { p o l y } \\bar { ( } d , P _ { 1 } , 1 / \\bar { \\beta } , 1 / \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 635, + 506, + 650 + ], + "score": 1.0, + "content": ". Similarly, we can also prove that", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 648, + 252, + 662 + ], + "spans": [ + { + "bbox": [ + 106, + 648, + 252, + 662 + ], + "score": 0.92, + "content": "\\| D _ { X } D _ { Y } ^ { - 1 } \\| \\le \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta )", + "type": "inline_equation" + } + ], + "index": 38 + } + ], + "index": 36.5 + }, + { + "type": "text", + "bbox": [ + 106, + 666, + 176, + 677 + ], + "lines": [ + { + "bbox": [ + 106, + 665, + 177, + 678 + ], + "spans": [ + { + "bbox": [ + 106, + 665, + 177, + 678 + ], + "score": 1.0, + "content": "Overall, we have", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 39 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 675, + 514, + 735 + ], + "lines": [ + { + "bbox": [ + 111, + 675, + 514, + 735 + ], + "spans": [ + { + "bbox": [ + 111, + 675, + 514, + 735 + ], + "score": 0.9, + "content": "\\begin{array} { r l } { \\mathfrak { s } ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } F \\| + \\| G \\| ) \\le \\kappa ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } \\| \\| F \\| + \\| G \\| ) } & { } \\\\ & { \\le \\frac { P _ { 1 } } { \\beta } \\Big ( \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta ) \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) + \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) } \\\\ & { \\le \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}", + "type": "interline_equation", + "image_path": "ba1d1ee8542e46b1dcb5d2dc74261c2585b11c04103a5a5e78e42fd5d94ac6c2.jpg" + } + ] + } + ], + "index": 41, + "virtual_lines": [ + { + "bbox": [ + 111, + 675, + 514, + 695.0 + ], + "spans": [], + "index": 40 + }, + { + "bbox": [ + 111, + 695.0, + 514, + 715.0 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 111, + 715.0, + 514, + 735.0 + ], + "spans": [], + "index": 42 + } + ] + } + ], + "page_idx": 29, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 39 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 39 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 312, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "30", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 79, + 506, + 156 + ], + "lines": [ + { + "bbox": [ + 104, + 79, + 504, + 97 + ], + "spans": [ + { + "bbox": [ + 104, + 79, + 221, + 97 + ], + "score": 1.0, + "content": "Lemma 12. Suppose that", + "type": "text" + }, + { + "bbox": [ + 222, + 81, + 504, + 95 + ], + "score": 0.88, + "content": "\\begin{array} { r c l } { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } } & { \\leq } & { \\epsilon , \\| A \\| } \\\\ & { } & { \\geq } \\end{array} \\leq \\epsilon , \\| A \\| \\ \\leq \\ { P } _ { 1 } , \\| \\xi \\| \\ \\leq \\ P _ { 2 } , \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\ \\geq", + "type": "inline_equation" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 93, + 506, + 109 + ], + "spans": [ + { + "bbox": [ + 107, + 95, + 181, + 108 + ], + "score": 0.89, + "content": "\\gamma , \\sigma _ { \\operatorname* { m i n } } ( A ) ~ \\geq ~ \\beta .", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 93, + 209, + 109 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 210, + 94, + 362, + 108 + ], + "score": 0.89, + "content": "\\hat { X } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 1 } ) , \\hat { Y } \\ = \\ m a t ^ { * } ( \\hat { S } \\zeta _ { 2 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 93, + 397, + 109 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 397, + 96, + 408, + 107 + ], + "score": 0.86, + "content": "\\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 93, + 431, + 109 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 431, + 96, + 441, + 107 + ], + "score": 0.87, + "content": "\\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 93, + 506, + 109 + ], + "score": 1.0, + "content": "are two inde-", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 104, + 105, + 506, + 119 + ], + "spans": [ + { + "bbox": [ + 104, + 105, + 278, + 119 + ], + "score": 1.0, + "content": "pendent standard Gaussian vectors. Let", + "type": "text" + }, + { + "bbox": [ + 279, + 108, + 316, + 118 + ], + "score": 0.88, + "content": "z _ { 1 } , \\cdots z _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 105, + 461, + 119 + ], + "score": 1.0, + "content": "be the normalized row vectors of", + "type": "text" + }, + { + "bbox": [ + 461, + 106, + 480, + 117 + ], + "score": 0.9, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 480, + 105, + 506, + 119 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 117, + 506, + 132 + ], + "spans": [ + { + "bbox": [ + 106, + 119, + 143, + 130 + ], + "score": 0.88, + "content": "\\hat { z } _ { 1 } , . . . , \\hat { z } _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 117, + 237, + 132 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 237, + 117, + 266, + 130 + ], + "score": 0.91, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 117, + 371, + 132 + ], + "score": 1.0, + "content": "(after sign flip). For any", + "type": "text" + }, + { + "bbox": [ + 371, + 119, + 398, + 129 + ], + "score": 0.89, + "content": "\\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 117, + 506, + 132 + ], + "score": 1.0, + "content": "and small enough \u000f, with", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 107, + 126, + 508, + 149 + ], + "spans": [ + { + "bbox": [ + 107, + 130, + 204, + 146 + ], + "score": 0.91, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 126, + 315, + 149 + ], + "score": 1.0, + "content": ") number of i.i.d. samples in", + "type": "text" + }, + { + "bbox": [ + 316, + 132, + 345, + 146 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 346, + 126, + 447, + 149 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + }, + { + "bbox": [ + 447, + 133, + 469, + 144 + ], + "score": 0.73, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 126, + 508, + 149 + ], + "score": 1.0, + "content": "over the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 144, + 456, + 157 + ], + "spans": [ + { + "bbox": [ + 106, + 144, + 167, + 157 + ], + "score": 1.0, + "content": "randomness of", + "type": "text" + }, + { + "bbox": [ + 168, + 145, + 190, + 156 + ], + "score": 0.86, + "content": "\\zeta _ { 1 } , \\zeta _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 144, + 373, + 157 + ], + "score": 1.0, + "content": "and i.i.d. samples, there exists a permutation", + "type": "text" + }, + { + "bbox": [ + 373, + 144, + 415, + 156 + ], + "score": 0.93, + "content": "\\pi ( i ) \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 144, + 456, + 157 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 2.5, + "bbox_fs": [ + 104, + 79, + 508, + 157 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 225, + 157, + 383, + 172 + ], + "lines": [ + { + "bbox": [ + 225, + 157, + 383, + 172 + ], + "spans": [ + { + "bbox": [ + 225, + 157, + 383, + 172 + ], + "score": 0.86, + "content": "\\begin{array} { r } { \\| \\hat { z } _ { i } - z _ { \\pi [ i ] } \\| \\le p o l y ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}", + "type": "interline_equation", + "image_path": "8edf9469821371490d668fb39458486c8d129368c06e0780a5e709c12e6cbd5d.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 225, + 157, + 383, + 172 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 171, + 182, + 184 + ], + "lines": [ + { + "bbox": [ + 104, + 171, + 183, + 185 + ], + "spans": [ + { + "bbox": [ + 104, + 171, + 137, + 185 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 138, + 172, + 179, + 183 + ], + "score": 0.88, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 171, + 183, + 185 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7, + "bbox_fs": [ + 104, + 171, + 183, + 185 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 194, + 506, + 231 + ], + "lines": [ + { + "bbox": [ + 105, + 194, + 506, + 208 + ], + "spans": [ + { + "bbox": [ + 105, + 194, + 154, + 208 + ], + "score": 1.0, + "content": "Proof. Let", + "type": "text" + }, + { + "bbox": [ + 154, + 195, + 198, + 207 + ], + "score": 0.91, + "content": "z _ { 1 } ^ { \\prime } , \\cdots , z _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 194, + 299, + 208 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 300, + 195, + 329, + 206 + ], + "score": 0.9, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 194, + 506, + 208 + ], + "score": 1.0, + "content": "(before sign flip step). Similarly define", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 107, + 203, + 506, + 226 + ], + "spans": [ + { + "bbox": [ + 107, + 208, + 150, + 220 + ], + "score": 0.87, + "content": "\\hat { z } _ { 1 } ^ { \\prime } , \\cdots , \\hat { z } _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 150, + 203, + 167, + 226 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 167, + 207, + 195, + 219 + ], + "score": 0.92, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 203, + 358, + 226 + ], + "score": 1.0, + "content": ". We first prove that the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 358, + 207, + 387, + 218 + ], + "score": 0.91, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 203, + 506, + 226 + ], + "score": 1.0, + "content": "are close to the eigenvectors", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 218, + 148, + 230 + ], + "spans": [ + { + "bbox": [ + 104, + 218, + 117, + 230 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 220, + 146, + 230 + ], + "score": 0.84, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 218, + 148, + 227 + ], + "score": 0.0, + "content": "", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9, + "bbox_fs": [ + 104, + 194, + 506, + 230 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 235, + 320, + 248 + ], + "lines": [ + { + "bbox": [ + 104, + 232, + 321, + 250 + ], + "spans": [ + { + "bbox": [ + 104, + 232, + 122, + 250 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 122, + 235, + 182, + 248 + ], + "score": 0.92, + "content": "{ \\hat { X } } = X + E _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 232, + 200, + 250 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 200, + 235, + 257, + 248 + ], + "score": 0.92, + "content": "\\hat { Y } = Y + E _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 232, + 321, + 250 + ], + "score": 1.0, + "content": ". Then we have", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11, + "bbox_fs": [ + 104, + 232, + 321, + 250 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 242, + 248, + 368, + 262 + ], + "lines": [ + { + "bbox": [ + 242, + 248, + 368, + 262 + ], + "spans": [ + { + "bbox": [ + 242, + 248, + 368, + 262 + ], + "score": 0.86, + "content": "\\hat { X } \\hat { Y } ^ { - 1 } = X Y ^ { - 1 } ( I + F ) + G ,", + "type": "interline_equation", + "image_path": "ff9afd0cbe176dd292a1f4f93f272846edc82e1bee593e39eab2867ebd0182cc.jpg" + } + ] + } + ], + "index": 12, + "virtual_lines": [ + { + "bbox": [ + 242, + 248, + 368, + 262 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 264, + 506, + 309 + ], + "lines": [ + { + "bbox": [ + 104, + 263, + 506, + 279 + ], + "spans": [ + { + "bbox": [ + 104, + 263, + 135, + 279 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 135, + 265, + 273, + 278 + ], + "score": 0.91, + "content": "F = - E _ { Y } ( I + Y ^ { - 1 } E _ { Y } ) ^ { - 1 } Y ^ { - 1 } ", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 263, + 294, + 279 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 294, + 264, + 355, + 277 + ], + "score": 0.92, + "content": "G = E _ { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 263, + 506, + 279 + ], + "score": 1.0, + "content": ". According to Lemma 34, we have", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 107, + 275, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 107, + 278, + 198, + 294 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\| \\boldsymbol { F } \\| \\le \\frac { \\| E _ { Y } \\| } { \\sigma _ { \\operatorname* { m i n } } ( Y ) - \\| E _ { Y } \\| } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 275, + 218, + 297 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 218, + 277, + 283, + 295 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\| G \\| \\le \\frac { \\| E _ { X } \\| } { \\sigma _ { \\operatorname* { m i n } } ( \\hat { Y } ) } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 275, + 467, + 297 + ], + "score": 1.0, + "content": ". In order to bound the perturbation matrices", + "type": "text" + }, + { + "bbox": [ + 468, + 279, + 486, + 291 + ], + "score": 0.92, + "content": "\\| F \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 275, + 506, + 297 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 107, + 294, + 373, + 309 + ], + "spans": [ + { + "bbox": [ + 107, + 296, + 125, + 309 + ], + "score": 0.91, + "content": "\\| G \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 295, + 221, + 309 + ], + "score": 1.0, + "content": ", we need to first bound", + "type": "text" + }, + { + "bbox": [ + 221, + 296, + 275, + 309 + ], + "score": 0.92, + "content": "\\| E _ { X } \\| , \\| E _ { Y } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 295, + 293, + 309 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 293, + 294, + 370, + 309 + ], + "score": 0.92, + "content": "\\sigma _ { \\mathrm { m i n } } ( Y ) , \\sigma _ { \\mathrm { m i n } } ( \\hat { Y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 295, + 373, + 309 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14, + "bbox_fs": [ + 104, + 263, + 506, + 309 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 313, + 505, + 350 + ], + "lines": [ + { + "bbox": [ + 104, + 313, + 505, + 329 + ], + "spans": [ + { + "bbox": [ + 104, + 313, + 163, + 329 + ], + "score": 1.0, + "content": "As we know,", + "type": "text" + }, + { + "bbox": [ + 164, + 313, + 295, + 327 + ], + "score": 0.92, + "content": "E _ { X } = \\hat { X } - X = ( \\hat { S } - S R ) \\zeta _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 313, + 446, + 329 + ], + "score": 1.0, + "content": ". According to Lemma 16, we have", + "type": "text" + }, + { + "bbox": [ + 446, + 313, + 505, + 327 + ], + "score": 0.92, + "content": "\\| \\hat { S } - S R \\| \\le", + "type": "inline_equation" + } + ], + "index": 16 + }, + { + "bbox": [ + 107, + 325, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 107, + 327, + 180, + 340 + ], + "score": 0.92, + "content": "\\| \\hat { S } - S R \\| _ { F } \\leq 2 \\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 325, + 338, + 342 + ], + "score": 1.0, + "content": ". We also know with probability at least", + "type": "text" + }, + { + "bbox": [ + 339, + 327, + 407, + 340 + ], + "score": 0.79, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 325, + 412, + 342 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 413, + 328, + 476, + 340 + ], + "score": 0.82, + "content": "\\| \\zeta _ { 1 } \\| \\le \\mathsf { p o l y } ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 325, + 506, + 342 + ], + "score": 1.0, + "content": ". Thus,", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 338, + 143, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 338, + 143, + 352 + ], + "score": 1.0, + "content": "we have", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17, + "bbox_fs": [ + 104, + 313, + 506, + 352 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 190, + 350, + 420, + 366 + ], + "lines": [ + { + "bbox": [ + 190, + 350, + 420, + 366 + ], + "spans": [ + { + "bbox": [ + 190, + 350, + 420, + 366 + ], + "score": 0.88, + "content": "\\| E _ { X } \\| = \\| ( \\hat { S } - S R ) \\zeta _ { 1 } \\| \\leq \\| \\hat { S } - S R \\| \\| \\zeta _ { 1 } \\| \\leq \\mathrm { p o l y } ( \\epsilon , d ) .", + "type": "interline_equation", + "image_path": "800754763d2678772d02f38d288f3142259a1d14416f12a5ad184e5d2e6cedf2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 190, + 350, + 420, + 366 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 111, + 367, + 451, + 381 + ], + "lines": [ + { + "bbox": [ + 108, + 366, + 454, + 383 + ], + "spans": [ + { + "bbox": [ + 108, + 366, + 245, + 383 + ], + "score": 1.0, + "content": "Similarly, with probability at least", + "type": "text" + }, + { + "bbox": [ + 245, + 367, + 315, + 381 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 366, + 376, + 383 + ], + "score": 1.0, + "content": ", we also know", + "type": "text" + }, + { + "bbox": [ + 377, + 368, + 454, + 381 + ], + "score": 0.9, + "content": "\\| E _ { Y } \\| \\le \\mathtt { p o l y } ( \\epsilon , d )", + "type": "inline_equation" + } + ], + "index": 20 + } + ], + "index": 20, + "bbox_fs": [ + 108, + 366, + 454, + 383 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 385, + 497, + 397 + ], + "lines": [ + { + "bbox": [ + 106, + 383, + 499, + 399 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 315, + 399 + ], + "score": 1.0, + "content": "Now, we lower bound the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 316, + 387, + 326, + 396 + ], + "score": 0.85, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 383, + 344, + 399 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 344, + 386, + 353, + 396 + ], + "score": 0.8, + "content": "Y", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 383, + 381, + 399 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 382, + 384, + 460, + 397 + ], + "score": 0.93, + "content": "X = A ^ { - \\top } D _ { X } A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 383, + 499, + 399 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21, + "bbox_fs": [ + 106, + 383, + 499, + 399 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 236, + 397, + 375, + 466 + ], + "lines": [ + { + "bbox": [ + 236, + 397, + 375, + 466 + ], + "spans": [ + { + "bbox": [ + 236, + 397, + 375, + 466 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { { \\sigma } _ { \\operatorname* { m i n } } ( X ) \\geq { \\sigma } _ { \\operatorname* { m i n } } ^ { 2 } ( A ^ { - 1 } ) { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) } \\\\ & { \\qquad = \\displaystyle \\frac { 1 } { \\| A \\| ^ { 2 } } { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) } \\\\ & { \\qquad \\geq \\displaystyle \\frac { 1 } { P _ { 1 } ^ { 2 } } { \\sigma } _ { \\operatorname* { m i n } } ( D _ { X } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "8c3ed5431b1b8a04aea5cae323b859ab4901cfe4a27f99d96ae1817430e22fde.jpg" + } + ] + } + ], + "index": 22.5, + "virtual_lines": [ + { + "bbox": [ + 236, + 397, + 375, + 431.5 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 236, + 431.5, + 375, + 466.0 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 466, + 506, + 536 + ], + "lines": [ + { + "bbox": [ + 106, + 466, + 506, + 479 + ], + "spans": [ + { + "bbox": [ + 106, + 466, + 132, + 479 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 467, + 149, + 478 + ], + "score": 0.9, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 150, + 466, + 506, + 479 + ], + "score": 1.0, + "content": "is a diagonal matrix, its smallest singular value equals the smallest absolute value of", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 476, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 328, + 490 + ], + "score": 1.0, + "content": "its diagonal element. Recall each diagonal element of", + "type": "text" + }, + { + "bbox": [ + 328, + 478, + 345, + 488 + ], + "score": 0.88, + "content": "D _ { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 476, + 357, + 490 + ], + "score": 1.0, + "content": "is", + "type": "text" + }, + { + "bbox": [ + 357, + 478, + 394, + 489 + ], + "score": 0.93, + "content": "\\langle q _ { i } , R \\zeta _ { 1 } \\rangle", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 476, + 506, + 490 + ], + "score": 1.0, + "content": ", which follows a Gaussian", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 487, + 506, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 308, + 501 + ], + "score": 1.0, + "content": "distribution whose standard deviation is at least", + "type": "text" + }, + { + "bbox": [ + 308, + 488, + 356, + 500 + ], + "score": 0.89, + "content": "\\left\\| q _ { i } \\right\\| \\ge \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 356, + 487, + 506, + 501 + ], + "score": 1.0, + "content": ". By anti-concentration property of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 498, + 506, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 260, + 513 + ], + "score": 1.0, + "content": "Gaussian (see Lemma 38), we know", + "type": "text" + }, + { + "bbox": [ + 261, + 500, + 360, + 511 + ], + "score": 0.89, + "content": "| \\langle q _ { i } , R \\zeta _ { 2 } \\rangle | \\ge \\Omega ( \\delta \\beta ^ { 2 } / k )", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 498, + 391, + 513 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 391, + 500, + 396, + 509 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 498, + 466, + 513 + ], + "score": 1.0, + "content": "with probability", + "type": "text" + }, + { + "bbox": [ + 467, + 499, + 501, + 511 + ], + "score": 0.94, + "content": "\\bar { 1 } - \\bar { \\delta } / 4", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 498, + 506, + 513 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 509, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 169, + 523 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + }, + { + "bbox": [ + 169, + 510, + 308, + 523 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( X ) \\geq \\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 509, + 492, + 523 + ], + "score": 1.0, + "content": ". Similarly we have the same conclusion for", + "type": "text" + }, + { + "bbox": [ + 492, + 511, + 501, + 520 + ], + "score": 0.82, + "content": "Y", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 509, + 505, + 523 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 523, + 358, + 536 + ], + "spans": [ + { + "bbox": [ + 105, + 523, + 178, + 536 + ], + "score": 1.0, + "content": "For small enough", + "type": "text" + }, + { + "bbox": [ + 179, + 524, + 194, + 534 + ], + "score": 0.89, + "content": "E _ { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 523, + 233, + 536 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 233, + 523, + 354, + 536 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\hat { Y } ) \\geq \\sigma _ { \\operatorname* { m i n } } ( Y ) - \\| E _ { Y } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 523, + 358, + 536 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 26.5, + "bbox_fs": [ + 105, + 466, + 506, + 536 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 539, + 506, + 585 + ], + "lines": [ + { + "bbox": [ + 104, + 538, + 505, + 553 + ], + "spans": [ + { + "bbox": [ + 104, + 538, + 225, + 553 + ], + "score": 1.0, + "content": "Thus, for small enough", + "type": "text" + }, + { + "bbox": [ + 225, + 542, + 231, + 550 + ], + "score": 0.64, + "content": "\\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 538, + 287, + 553 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 288, + 540, + 436, + 552 + ], + "score": 0.9, + "content": "\\begin{array} { r l r } { \\| { \\cal F } \\| } & { { } \\le } & { \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) _ { . } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 538, + 464, + 553 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 464, + 540, + 505, + 551 + ], + "score": 0.8, + "content": "\\| G \\| \\quad \\leq", + "type": "inline_equation" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 549, + 506, + 564 + ], + "spans": [ + { + "bbox": [ + 107, + 551, + 202, + 563 + ], + "score": 0.87, + "content": "\\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 549, + 410, + 564 + ], + "score": 1.0, + "content": ". In order to apply Lemma 33, we also need to bound", + "type": "text" + }, + { + "bbox": [ + 411, + 551, + 444, + 563 + ], + "score": 0.91, + "content": "\\kappa ( \\boldsymbol { A } ^ { - \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 549, + 462, + 564 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 463, + 551, + 501, + 563 + ], + "score": 0.74, + "content": "\\| X Y ^ { - 1 } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 549, + 506, + 564 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 104, + 559, + 501, + 577 + ], + "spans": [ + { + "bbox": [ + 104, + 559, + 132, + 577 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 562, + 207, + 576 + ], + "score": 0.88, + "content": "\\textstyle \\sigma _ { \\operatorname* { m i n } } ( { \\dot { A } } ^ { - \\top } ) \\geq { \\frac { 1 } { P _ { 1 } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 559, + 226, + 577 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 226, + 561, + 288, + 574 + ], + "score": 0.93, + "content": "\\| A ^ { - \\top } \\| \\leq 1 / \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 559, + 329, + 577 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 329, + 561, + 401, + 574 + ], + "score": 0.92, + "content": "\\kappa ( A ^ { - \\top } ) \\leq P _ { 1 } / \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 559, + 472, + 577 + ], + "score": 1.0, + "content": ". For the norm of", + "type": "text" + }, + { + "bbox": [ + 473, + 563, + 501, + 573 + ], + "score": 0.76, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 572, + 143, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 143, + 587 + ], + "score": 1.0, + "content": "we have", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31.5, + "bbox_fs": [ + 104, + 538, + 506, + 587 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 199, + 585, + 411, + 612 + ], + "lines": [ + { + "bbox": [ + 199, + 585, + 411, + 612 + ], + "spans": [ + { + "bbox": [ + 199, + 585, + 411, + 612 + ], + "score": 0.92, + "content": "\\lVert X Y ^ { - 1 } \\rVert \\leq \\frac { \\lVert X \\rVert } { \\sigma _ { \\operatorname* { m i n } } ( Y ) } \\leq \\lVert X \\rVert \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta ) ,", + "type": "interline_equation", + "image_path": "4cda29ce5aa9c611e198d390f8a061031842c8bb4689519b97b8f09ab1db3406.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 199, + 585, + 411, + 612 + ], + "spans": [], + "index": 34 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 613, + 506, + 662 + ], + "lines": [ + { + "bbox": [ + 106, + 612, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 286, + 626 + ], + "score": 1.0, + "content": "where the second inequality holds because", + "type": "text" + }, + { + "bbox": [ + 287, + 613, + 426, + 626 + ], + "score": 0.87, + "content": "\\sigma _ { \\operatorname* { m i n } } ( Y ) \\geq \\mathrm { { p o l y } } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 427, + 612, + 480, + 626 + ], + "score": 1.0, + "content": ". Recall that", + "type": "text" + }, + { + "bbox": [ + 480, + 613, + 505, + 624 + ], + "score": 0.86, + "content": "X =", + "type": "inline_equation" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 623, + 505, + 639 + ], + "spans": [ + { + "bbox": [ + 106, + 625, + 158, + 637 + ], + "score": 0.84, + "content": "\\mathrm { m a t } ^ { * } ( S R \\zeta _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 623, + 364, + 639 + ], + "score": 1.0, + "content": ". It’s not hard to verify that with probability at least", + "type": "text" + }, + { + "bbox": [ + 364, + 625, + 434, + 637 + ], + "score": 0.89, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 623, + 473, + 639 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 473, + 625, + 505, + 637 + ], + "score": 0.9, + "content": "\\| X \\| \\leq", + "type": "inline_equation" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 635, + 506, + 650 + ], + "spans": [ + { + "bbox": [ + 105, + 635, + 126, + 650 + ], + "score": 1.0, + "content": "poly", + "type": "text" + }, + { + "bbox": [ + 126, + 637, + 138, + 648 + ], + "score": 0.44, + "content": "( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 635, + 214, + 650 + ], + "score": 1.0, + "content": ". Thus, we know", + "type": "text" + }, + { + "bbox": [ + 214, + 636, + 357, + 649 + ], + "score": 0.89, + "content": "\\| X Y ^ { - \\bar { 1 } } \\| \\le \\mathrm { p o l y } \\bar { ( } d , P _ { 1 } , 1 / \\bar { \\beta } , 1 / \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 635, + 506, + 650 + ], + "score": 1.0, + "content": ". Similarly, we can also prove that", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 648, + 252, + 662 + ], + "spans": [ + { + "bbox": [ + 106, + 648, + 252, + 662 + ], + "score": 0.92, + "content": "\\| D _ { X } D _ { Y } ^ { - 1 } \\| \\le \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta )", + "type": "inline_equation" + } + ], + "index": 38 + } + ], + "index": 36.5, + "bbox_fs": [ + 105, + 612, + 506, + 662 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 666, + 176, + 677 + ], + "lines": [ + { + "bbox": [ + 106, + 665, + 177, + 678 + ], + "spans": [ + { + "bbox": [ + 106, + 665, + 177, + 678 + ], + "score": 1.0, + "content": "Overall, we have", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 39, + "bbox_fs": [ + 106, + 665, + 177, + 678 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 675, + 514, + 735 + ], + "lines": [ + { + "bbox": [ + 111, + 675, + 514, + 735 + ], + "spans": [ + { + "bbox": [ + 111, + 675, + 514, + 735 + ], + "score": 0.9, + "content": "\\begin{array} { r l } { \\mathfrak { s } ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } F \\| + \\| G \\| ) \\le \\kappa ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } \\| \\| F \\| + \\| G \\| ) } & { } \\\\ & { \\le \\frac { P _ { 1 } } { \\beta } \\Big ( \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , 1 / \\delta ) \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) + \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) } \\\\ & { \\le \\mathtt { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}", + "type": "interline_equation", + "image_path": "ba1d1ee8542e46b1dcb5d2dc74261c2585b11c04103a5a5e78e42fd5d94ac6c2.jpg" + } + ] + } + ], + "index": 41, + "virtual_lines": [ + { + "bbox": [ + 111, + 675, + 514, + 695.0 + ], + "spans": [], + "index": 40 + }, + { + "bbox": [ + 111, + 695.0, + 514, + 715.0 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 111, + 715.0, + 514, + 735.0 + ], + "spans": [], + "index": 42 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 115 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 504, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 381, + 96 + ], + "score": 1.0, + "content": "According to Lemma 17, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 382, + 82, + 421, + 95 + ], + "score": 0.84, + "content": "1 \\mathrm { ~ - ~ } \\delta / 4", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 81, + 429, + 96 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 429, + 81, + 504, + 95 + ], + "score": 0.8, + "content": "\\begin{array} { r l } { \\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) } & { { } \\geq } \\end{array}", + "type": "inline_equation" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 107, + 93, + 194, + 106 + ], + "score": 0.86, + "content": "\\mathrm { p o l y } ( 1 / d , 1 / P _ { 1 } , \\beta , \\delta )", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 93, + 398, + 106 + ], + "score": 1.0, + "content": ". Thus, by union bound, we know for small enough", + "type": "text" + }, + { + "bbox": [ + 399, + 96, + 404, + 104 + ], + "score": 0.73, + "content": "\\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 93, + 505, + 106 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 102, + 135, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 129, + 115 + ], + "score": 0.85, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 130, + 102, + 135, + 117 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "interline_equation", + "bbox": [ + 198, + 113, + 412, + 128 + ], + "lines": [ + { + "bbox": [ + 198, + 113, + 412, + 128 + ], + "spans": [ + { + "bbox": [ + 198, + 113, + 412, + 128 + ], + "score": 0.89, + "content": "\\kappa ( A ^ { - \\top } ) ( \\| X Y ^ { - 1 } F \\| + \\| G \\| ) < \\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) / ( 2 k ) .", + "type": "interline_equation", + "image_path": "d6513cc3b9086b2fe69091a81029b8fe010ad6d598f5108489d824332b35a38c.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 198, + 113, + 412, + 128 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 110, + 130, + 430, + 143 + ], + "lines": [ + { + "bbox": [ + 108, + 129, + 432, + 144 + ], + "spans": [ + { + "bbox": [ + 108, + 129, + 352, + 144 + ], + "score": 1.0, + "content": "According to Lemma 33, we know there exists a permutation", + "type": "text" + }, + { + "bbox": [ + 353, + 131, + 392, + 143 + ], + "score": 0.92, + "content": "\\pi [ i ] \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 129, + 432, + 144 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + }, + { + "type": "interline_equation", + "bbox": [ + 132, + 147, + 479, + 220 + ], + "lines": [ + { + "bbox": [ + 132, + 147, + 479, + 220 + ], + "spans": [ + { + "bbox": [ + 132, + 147, + 479, + 220 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\| \\hat { z } _ { i } ^ { \\prime } - z _ { i } ^ { \\prime } \\| \\leq 3 \\frac { \\| F \\| \\| D _ { X } D _ { Y } ^ { - 1 } \\| + \\| G \\| } { \\sigma _ { \\operatorname* { m i n } } \\left( A ^ { - \\top } \\right) \\operatorname { s e p } \\left( D _ { X } D _ { Y } ^ { - 1 } \\right) } } \\\\ & { \\qquad \\leq 3 \\frac { \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta \\right) \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , 1 / \\delta \\right) + \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta \\right) } { 1 / P _ { 1 } \\mathrm { p o l y } \\left( 1 / d , 1 / P _ { 1 } , \\beta , 1 / \\delta \\right) } } \\\\ & { \\qquad \\leq \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}", + "type": "interline_equation", + "image_path": "f2da000ad40eebd0026421536d6c3abf59741b84dddf98849a6ce678a72fb9b1.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 132, + 147, + 479, + 171.33333333333334 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 132, + 171.33333333333334, + 479, + 195.66666666666669 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 132, + 195.66666666666669, + 479, + 220.00000000000003 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 224, + 229, + 236 + ], + "lines": [ + { + "bbox": [ + 105, + 223, + 226, + 238 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 203, + 238 + ], + "score": 1.0, + "content": "with probability at least", + "type": "text" + }, + { + "bbox": [ + 204, + 225, + 226, + 235 + ], + "score": 0.84, + "content": "1 - \\delta", + "type": "inline_equation" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 106, + 240, + 506, + 305 + ], + "lines": [ + { + "bbox": [ + 105, + 239, + 506, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 239, + 282, + 255 + ], + "score": 1.0, + "content": "According to Lemma 5, the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 282, + 241, + 311, + 252 + ], + "score": 0.91, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 239, + 506, + 255 + ], + "score": 1.0, + "content": "(after sign flip) are exactly the normalized rows", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 251, + 506, + 266 + ], + "spans": [ + { + "bbox": [ + 105, + 251, + 118, + 266 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 252, + 137, + 263 + ], + "score": 0.89, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 251, + 366, + 266 + ], + "score": 1.0, + "content": "(up to permutation). Now the only issue is the sign of", + "type": "text" + }, + { + "bbox": [ + 366, + 253, + 375, + 264 + ], + "score": 0.88, + "content": "\\hat { z } _ { i } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 251, + 506, + 266 + ], + "score": 1.0, + "content": ". By the robustness of sign flip", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 103, + 262, + 508, + 282 + ], + "spans": [ + { + "bbox": [ + 103, + 262, + 308, + 282 + ], + "score": 1.0, + "content": "step (see Lemma 18), we know for small enough", + "type": "text" + }, + { + "bbox": [ + 308, + 270, + 313, + 278 + ], + "score": 0.68, + "content": "\\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 262, + 339, + 282 + ], + "score": 1.0, + "content": ", with", + "type": "text" + }, + { + "bbox": [ + 339, + 264, + 437, + 281 + ], + "score": 0.93, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 262, + 508, + 282 + ], + "score": 1.0, + "content": "number of i.i.d.", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 280, + 506, + 296 + ], + "spans": [ + { + "bbox": [ + 105, + 280, + 151, + 296 + ], + "score": 1.0, + "content": "samples in", + "type": "text" + }, + { + "bbox": [ + 152, + 280, + 182, + 294 + ], + "score": 0.93, + "content": "\\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y ]", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 280, + 284, + 296 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + }, + { + "bbox": [ + 284, + 282, + 307, + 292 + ], + "score": 0.84, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 280, + 372, + 296 + ], + "score": 1.0, + "content": ", the sign flip of", + "type": "text" + }, + { + "bbox": [ + 372, + 282, + 381, + 294 + ], + "score": 0.88, + "content": "\\hat { z } _ { i } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 280, + 506, + 296 + ], + "score": 1.0, + "content": "is consistent with the sign flip", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 103, + 290, + 504, + 308 + ], + "spans": [ + { + "bbox": [ + 103, + 290, + 117, + 308 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 293, + 126, + 305 + ], + "score": 0.88, + "content": "z _ { i } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 290, + 133, + 308 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 494, + 294, + 504, + 303 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 316, + 387, + 329 + ], + "lines": [ + { + "bbox": [ + 105, + 315, + 388, + 330 + ], + "spans": [ + { + "bbox": [ + 105, + 315, + 339, + 330 + ], + "score": 1.0, + "content": "In the following lemma, we show that the sign flip step of", + "type": "text" + }, + { + "bbox": [ + 339, + 317, + 348, + 328 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 315, + 388, + 330 + ], + "score": 1.0, + "content": "is robust.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 106, + 331, + 507, + 385 + ], + "lines": [ + { + "bbox": [ + 105, + 330, + 506, + 345 + ], + "spans": [ + { + "bbox": [ + 105, + 330, + 215, + 345 + ], + "score": 1.0, + "content": "Lemma 18. Suppose that", + "type": "text" + }, + { + "bbox": [ + 216, + 331, + 348, + 344 + ], + "score": 0.92, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 330, + 369, + 345 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 369, + 332, + 412, + 344 + ], + "score": 0.91, + "content": "z _ { 1 } ^ { \\prime } , \\cdots , z _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 330, + 506, + 345 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 342, + 505, + 359 + ], + "spans": [ + { + "bbox": [ + 106, + 344, + 135, + 356 + ], + "score": 0.89, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 342, + 289, + 359 + ], + "score": 1.0, + "content": "(before sign flip step). Similarly define", + "type": "text" + }, + { + "bbox": [ + 289, + 345, + 332, + 357 + ], + "score": 0.43, + "content": "\\hat { z } _ { 1 } ^ { \\prime } , \\cdots , \\hat { z } _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 342, + 347, + 359 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 347, + 344, + 375, + 356 + ], + "score": 0.65, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 342, + 458, + 359 + ], + "score": 1.0, + "content": ". Suppose for each i,", + "type": "text" + }, + { + "bbox": [ + 459, + 344, + 505, + 357 + ], + "score": 0.9, + "content": "\\| z _ { i } ^ { \\prime } { - } \\hat { z } _ { i } ^ { \\prime } \\| \\leq", + "type": "inline_equation" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 353, + 509, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 144, + 378 + ], + "score": 1.0, + "content": "\u000f, where", + "type": "text" + }, + { + "bbox": [ + 144, + 358, + 230, + 376 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\epsilon \\le \\frac { \\beta \\gamma } { 4 \\Gamma \\left( 1 + \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } \\right) } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 353, + 309, + 378 + ], + "score": 1.0, + "content": ". We know, for any", + "type": "text" + }, + { + "bbox": [ + 310, + 360, + 335, + 371 + ], + "score": 0.89, + "content": "\\delta < 1", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 353, + 360, + 378 + ], + "score": 1.0, + "content": ", with", + "type": "text" + }, + { + "bbox": [ + 361, + 357, + 457, + 373 + ], + "score": 0.93, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 458, + 353, + 509, + 378 + ], + "score": 1.0, + "content": "number of", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 372, + 165, + 388 + ], + "spans": [ + { + "bbox": [ + 105, + 372, + 165, + 388 + ], + "score": 1.0, + "content": "i.i.d. samples,", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 16.5 + }, + { + "type": "interline_equation", + "bbox": [ + 214, + 384, + 396, + 406 + ], + "lines": [ + { + "bbox": [ + 214, + 384, + 396, + 406 + ], + "spans": [ + { + "bbox": [ + 214, + 384, + 396, + 406 + ], + "score": 0.91, + "content": "\\operatorname* { P r } \\left[ s i g n ( \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] ) \\neq s i g n ( \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ) \\right] \\leq \\delta .", + "type": "interline_equation", + "image_path": "f9b54686ad52d30c9d1adf97b49d7bc05d04417afaf39d12bd8cceaeceede0b2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 214, + 384, + 396, + 406 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 506, + 451 + ], + "lines": [ + { + "bbox": [ + 105, + 417, + 506, + 430 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 212, + 430 + ], + "score": 1.0, + "content": "Proof. We first show that", + "type": "text" + }, + { + "bbox": [ + 212, + 417, + 251, + 430 + ], + "score": 0.93, + "content": "\\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ]", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 417, + 386, + 430 + ], + "score": 1.0, + "content": "is bounded away from zero. Let", + "type": "text" + }, + { + "bbox": [ + 386, + 418, + 397, + 428 + ], + "score": 0.88, + "content": "Z ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 417, + 419, + 430 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 419, + 418, + 444, + 428 + ], + "score": 0.91, + "content": "k \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 417, + 506, + 430 + ], + "score": 1.0, + "content": "matrix, whose", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 428, + 505, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 144, + 442 + ], + "score": 1.0, + "content": "rows are", + "type": "text" + }, + { + "bbox": [ + 144, + 429, + 162, + 441 + ], + "score": 0.91, + "content": "\\{ z _ { i } ^ { \\prime } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 428, + 328, + 442 + ], + "score": 1.0, + "content": ". Without loss of generality, assume that", + "type": "text" + }, + { + "bbox": [ + 328, + 429, + 410, + 441 + ], + "score": 0.92, + "content": "Z ^ { \\prime } = \\mathrm { d i a g } ( \\pm \\lambda ) A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 428, + 441, + 442 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 441, + 428, + 501, + 441 + ], + "score": 0.92, + "content": "\\| A ^ { - 1 } \\| \\le 1 / \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 428, + 505, + 442 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 439, + 282, + 452 + ], + "spans": [ + { + "bbox": [ + 106, + 439, + 145, + 452 + ], + "score": 1.0, + "content": "we know", + "type": "text" + }, + { + "bbox": [ + 145, + 441, + 174, + 451 + ], + "score": 0.91, + "content": "\\lambda _ { i } \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 439, + 213, + 452 + ], + "score": 1.0, + "content": ", for each", + "type": "text" + }, + { + "bbox": [ + 214, + 441, + 218, + 449 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 439, + 282, + 452 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21 + }, + { + "type": "interline_equation", + "bbox": [ + 214, + 455, + 396, + 470 + ], + "lines": [ + { + "bbox": [ + 214, + 455, + 396, + 470 + ], + "spans": [ + { + "bbox": [ + 214, + 455, + 396, + 470 + ], + "score": 0.9, + "content": "\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | = \\lambda _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ] \\geq \\beta \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ] . } \\end{array}", + "type": "interline_equation", + "image_path": "cff95dd7daf54bf175fd2a58a03a385e7581c4a58de9064c1d9e7dafc041ef08.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 214, + 455, + 396, + 470 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 476, + 381, + 490 + ], + "lines": [ + { + "bbox": [ + 105, + 475, + 381, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 475, 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\\sigma ( w _ { i } ^ { \\top } x ) x ^ { \\top } ] \\| } & { = \\displaystyle \\frac { 1 } { 2 } \\| \\mathbb { E } [ w _ { i } ^ { \\top } x x ^ { \\top } ] \\| } \\\\ & { \\qquad \\geq \\displaystyle \\frac { 1 } { 2 } \\| w _ { i } \\| \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) } \\\\ & { \\qquad \\geq \\displaystyle \\frac { \\gamma } { 2 } . } \\end{array}", + "type": "interline_equation", + "image_path": "073b7fbd80663b5a8f952b05331da0c247069c6a2f76479a4d0f970c681fea2a.jpg" + } + ] + } + ], + "index": 26.5, + "virtual_lines": [ + { + "bbox": [ + 222, + 494, + 389, + 511.75 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 222, + 511.75, + 389, + 529.5 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 222, + 529.5, + 389, + 547.25 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 222, + 547.25, + 389, + 565.0 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 569, + 324, + 583 + ], + 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\\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| = \\| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] + \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| } \\\\ & { \\qquad \\leq \\| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } - \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| + \\| \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| } \\\\ & { \\qquad \\leq ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\epsilon + \\| \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] \\| . } \\end{array}", + "type": 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1 } F \\| + \\| G \\| ) < \\mathrm { s e p } ( D _ { X } D _ { Y } ^ { - 1 } ) / ( 2 k ) .", + "type": "interline_equation", + "image_path": "d6513cc3b9086b2fe69091a81029b8fe010ad6d598f5108489d824332b35a38c.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 198, + 113, + 412, + 128 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 110, + 130, + 430, + 143 + ], + "lines": [ + { + "bbox": [ + 108, + 129, + 432, + 144 + ], + "spans": [ + { + "bbox": [ + 108, + 129, + 352, + 144 + ], + "score": 1.0, + "content": "According to Lemma 33, we know there exists a permutation", + "type": "text" + }, + { + "bbox": [ + 353, + 131, + 392, + 143 + ], + "score": 0.92, + "content": "\\pi [ i ] \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 129, + 432, + 144 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4, + "bbox_fs": [ + 108, + 129, + 432, + 144 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 132, + 147, + 479, + 220 + ], + "lines": [ + { + "bbox": [ + 132, + 147, + 479, + 220 + ], + "spans": [ + { + "bbox": [ + 132, + 147, + 479, + 220 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\| \\hat { z } _ { i } ^ { \\prime } - z _ { i } ^ { \\prime } \\| \\leq 3 \\frac { \\| F \\| \\| D _ { X } D _ { Y } ^ { - 1 } \\| + \\| G \\| } { \\sigma _ { \\operatorname* { m i n } } \\left( A ^ { - \\top } \\right) \\operatorname { s e p } \\left( D _ { X } D _ { Y } ^ { - 1 } \\right) } } \\\\ & { \\qquad \\leq 3 \\frac { \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta \\right) \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , 1 / \\delta \\right) + \\mathrm { p o l y } \\left( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta \\right) } { 1 / P _ { 1 } \\mathrm { p o l y } \\left( 1 / d , 1 / P _ { 1 } , \\beta , 1 / \\delta \\right) } } \\\\ & { \\qquad \\leq \\mathrm { p o l y } ( d , P _ { 1 } , 1 / \\beta , \\epsilon , 1 / \\delta ) . } \\end{array}", + "type": "interline_equation", + "image_path": "f2da000ad40eebd0026421536d6c3abf59741b84dddf98849a6ce678a72fb9b1.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 132, + 147, + 479, + 171.33333333333334 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 132, + 171.33333333333334, + 479, + 195.66666666666669 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 132, + 195.66666666666669, + 479, + 220.00000000000003 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 224, + 229, + 236 + ], + "lines": [ + { + "bbox": [ + 105, + 223, + 226, + 238 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 203, + 238 + ], + "score": 1.0, + "content": "with probability at least", + "type": "text" + }, + { + "bbox": [ + 204, + 225, + 226, + 235 + ], + "score": 0.84, + "content": "1 - \\delta", + "type": "inline_equation" + } + ], + "index": 8 + } + ], + "index": 8, + "bbox_fs": [ + 105, + 223, + 226, + 238 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 240, + 506, + 305 + ], + "lines": [ + { + "bbox": [ + 105, + 239, + 506, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 239, + 282, + 255 + ], + "score": 1.0, + "content": "According to Lemma 5, the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 282, + 241, + 311, + 252 + ], + "score": 0.91, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 239, + 506, + 255 + ], + "score": 1.0, + "content": "(after sign flip) are exactly the normalized rows", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 251, + 506, + 266 + ], + "spans": [ + { + "bbox": [ + 105, + 251, + 118, + 266 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 252, + 137, + 263 + ], + "score": 0.89, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 251, + 366, + 266 + ], + "score": 1.0, + "content": "(up to permutation). Now the only issue is the sign of", + "type": "text" + }, + { + "bbox": [ + 366, + 253, + 375, + 264 + ], + "score": 0.88, + "content": "\\hat { z } _ { i } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 251, + 506, + 266 + ], + "score": 1.0, + "content": ". 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Suppose that", + "type": "text" + }, + { + "bbox": [ + 216, + 331, + 348, + 344 + ], + "score": 0.92, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 330, + 369, + 345 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 369, + 332, + 412, + 344 + ], + "score": 0.91, + "content": "z _ { 1 } ^ { \\prime } , \\cdots , z _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 330, + 506, + 345 + ], + "score": 1.0, + "content": "be the eigenvectors of", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 342, + 505, + 359 + ], + "spans": [ + { + "bbox": [ + 106, + 344, + 135, + 356 + ], + "score": 0.89, + "content": "X Y ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 342, + 289, + 359 + ], + "score": 1.0, + "content": "(before sign flip step). Similarly define", + "type": "text" + }, + { + "bbox": [ + 289, + 345, + 332, + 357 + ], + "score": 0.43, + "content": "\\hat { z } _ { 1 } ^ { \\prime } , \\cdots , \\hat { z } _ { k } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 342, + 347, + 359 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 347, + 344, + 375, + 356 + ], + "score": 0.65, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 342, + 458, + 359 + ], + "score": 1.0, + "content": ". Suppose for each i,", + "type": "text" + }, + { + "bbox": [ + 459, + 344, + 505, + 357 + ], + "score": 0.9, + "content": "\\| z _ { i } ^ { \\prime } { - } \\hat { z } _ { i } ^ { \\prime } \\| \\leq", + "type": "inline_equation" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 353, + 509, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 144, + 378 + ], + "score": 1.0, + "content": "\u000f, where", + "type": "text" + }, + { + "bbox": [ + 144, + 358, + 230, + 376 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\epsilon \\le \\frac { \\beta \\gamma } { 4 \\Gamma \\left( 1 + \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } \\right) } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 353, + 309, + 378 + ], + "score": 1.0, + "content": ". 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We first show that", + "type": "text" + }, + { + "bbox": [ + 212, + 417, + 251, + 430 + ], + "score": 0.93, + "content": "\\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ]", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 417, + 386, + 430 + ], + "score": 1.0, + "content": "is bounded away from zero. Let", + "type": "text" + }, + { + "bbox": [ + 386, + 418, + 397, + 428 + ], + "score": 0.88, + "content": "Z ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 417, + 419, + 430 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 419, + 418, + 444, + 428 + ], + "score": 0.91, + "content": "k \\times k", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 417, + 506, + 430 + ], + "score": 1.0, + "content": "matrix, whose", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 428, + 505, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 144, + 442 + ], + "score": 1.0, + "content": "rows are", + "type": "text" + }, + { + "bbox": [ + 144, + 429, + 162, + 441 + ], + "score": 0.91, + "content": "\\{ z _ { i } ^ { \\prime } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 428, + 328, + 442 + ], + "score": 1.0, + "content": ". Without loss of generality, assume that", + "type": "text" + }, + { + "bbox": [ + 328, + 429, + 410, + 441 + ], + "score": 0.92, + "content": "Z ^ { \\prime } = \\mathrm { d i a g } ( \\pm \\lambda ) A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 428, + 441, + 442 + ], + "score": 1.0, + "content": ". Since", + "type": "text" + }, + { + "bbox": [ + 441, + 428, + 501, + 441 + ], + "score": 0.92, + "content": "\\| A ^ { - 1 } \\| \\le 1 / \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 428, + 505, + 442 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 439, + 282, + 452 + ], + "spans": [ + { + "bbox": [ + 106, + 439, + 145, + 452 + ], + "score": 1.0, + "content": "we know", + "type": "text" + }, + { + "bbox": [ + 145, + 441, + 174, + 451 + ], + "score": 0.91, + "content": "\\lambda _ { i } \\geq \\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 439, + 213, + 452 + ], + "score": 1.0, + "content": ", for each", + "type": "text" + }, + { + "bbox": [ + 214, + 441, + 218, + 449 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 439, + 282, + 452 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 417, + 506, + 452 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 214, + 455, + 396, + 470 + ], + "lines": [ + { + "bbox": [ + 214, + 455, + 396, + 470 + ], + "spans": [ + { + "bbox": [ + 214, + 455, + 396, + 470 + ], + "score": 0.9, + "content": "\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | = \\lambda _ { i } \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ] \\geq \\beta \\mathbb { E } [ \\sigma ( w _ { i } ^ { \\top } x ) ] . } \\end{array}", + "type": "interline_equation", + "image_path": "cff95dd7daf54bf175fd2a58a03a385e7581c4a58de9064c1d9e7dafc041ef08.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 214, + 455, + 396, + 470 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 476, + 381, + 490 + ], + "lines": [ + { + "bbox": [ + 105, + 475, + 381, + 491 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this step, thus", + "type": "text" + }, + { + "bbox": [ + 322, + 83, + 331, + 94 + ], + "score": 0.88, + "content": "\\hat { z } _ { i } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 332, + 79, + 459, + 96 + ], + "score": 1.0, + "content": "is independent with samples in", + "type": "text" + }, + { + "bbox": [ + 460, + 81, + 501, + 95 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 79, + 505, + 96 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 102, + 88, + 509, + 114 + ], + "spans": [ + { + "bbox": [ + 102, + 88, + 132, + 114 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 96, + 240, + 110 + ], + "score": 0.93, + "content": "\\| \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle \\| \\le \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 }", + 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\\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ] \\| \\leq \\epsilon . } \\end{array}", + "type": "interline_equation", + "image_path": "f54d30822e91602a4f37abb5a7ed27529c0b77e1c65ec60b54a8f5ed4bb6e518.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 244, + 119, + 366, + 135 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 139, + 506, + 182 + ], + "lines": [ + { + "bbox": [ + 105, + 138, + 506, + 153 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 181, + 153 + ], + "score": 1.0, + "content": "Overall, we have", + "type": "text" + }, + { + "bbox": [ + 182, + 139, + 382, + 153 + ], + "score": 0.87, + "content": "| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ] | \\leq ( 1 + \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 138, + 506, + 153 + ], + "score": 1.0, + "content": ". Combined with the fact that", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 107, + 147, + 510, + 175 + ], + "spans": [ + { + "bbox": [ + 107, + 154, + 176, + 169 + ], + "score": 0.93, + "content": "\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | \\ge \\frac { \\beta \\gamma } { 2 \\Gamma } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 151, + 261, + 172 + ], + "score": 1.0, + "content": ", we know as long as", + "type": "text" + }, + { + "bbox": [ + 273, + 147, + 510, + 175 + ], + "score": 1.0, + "content": "≤ βγ4Γ(1+ΓP1√k+P2) , with O( (ΓP1√k+P2)2 log(d/δ)\u000f2 ) number", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 170, + 190, + 182 + ], + "spans": [ + { + "bbox": [ + 106, + 170, + 190, + 182 + ], + "score": 1.0, + "content": "of samples, we have", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5 + }, + { + "type": "interline_equation", + "bbox": [ + 217, + 182, + 393, + 198 + ], + "lines": [ + { + "bbox": [ + 217, + 182, + 393, + 198 + ], + "spans": [ + { + "bbox": [ + 217, + 182, + 393, + 198 + ], + "score": 0.9, + "content": "\\operatorname* { P r } [ \\operatorname { s i g n } ( \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] ) \\neq \\operatorname { s i g n } ( \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ) ] \\leq \\delta .", + "type": "interline_equation", + "image_path": "dd5447c57754b4f8428e24a30f372a7df9a5a16c9ae7fd2522f33a706ebcbf2e.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 217, + 182, + 393, + 198 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "title", + "bbox": [ + 106, + 228, + 398, + 241 + ], + "lines": [ + { + "bbox": [ + 106, + 228, + 399, + 241 + ], + "spans": [ + { + "bbox": [ + 106, + 228, + 399, + 241 + ], + "score": 1.0, + "content": "B.3 ROBUST ANALYSIS FOR RECOVERING FIRST LAYER WEIGHTS", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 107, + 249, + 288, + 262 + ], + "lines": [ + { + "bbox": [ + 106, + 249, + 288, + 263 + ], + "spans": [ + { + "bbox": [ + 106, + 249, + 288, + 263 + ], + "score": 1.0, + "content": "We will first show that Algorithm 1 is robust.", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 264, + 506, + 305 + ], + "lines": [ + { + "bbox": [ + 105, + 263, + 505, + 279 + ], + "spans": [ + { + "bbox": [ + 105, + 263, + 214, + 279 + ], + "score": 1.0, + "content": "Theorem 8. Assume that", + "type": "text" + }, + { + "bbox": [ + 215, + 265, + 340, + 278 + ], + "score": 0.9, + "content": "\\| x \\| \\leq \\Gamma , \\| w \\| \\leq 1 , | \\xi | \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 263, + 361, + 279 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 361, + 265, + 443, + 278 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma .", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 263, + 505, + 279 + ], + "score": 1.0, + "content": ". Then for any", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 271, + 509, + 298 + ], + "spans": [ + { + "bbox": [ + 106, + 280, + 143, + 293 + ], + "score": 0.9, + "content": "\\epsilon \\leq \\gamma / 2", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 271, + 180, + 298 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 181, + 281, + 228, + 292 + ], + "score": 0.9, + "content": "1 > \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 271, + 257, + 298 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 258, + 277, + 338, + 295 + ], + "score": 0.92, + "content": "\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 271, + 509, + 298 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we know with", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 104, + 294, + 212, + 306 + ], + "spans": [ + { + "bbox": [ + 104, + 294, + 184, + 306 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 185, + 294, + 207, + 304 + ], + "score": 0.79, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 294, + 212, + 306 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11 + }, + { + "type": "interline_equation", + "bbox": [ + 276, + 306, + 334, + 320 + ], + "lines": [ + { + "bbox": [ + 276, + 306, + 334, + 320 + ], + "spans": [ + { + "bbox": [ + 276, + 306, + 334, + 320 + ], + "score": 0.89, + "content": "\\| \\hat { w } - w \\| \\leq \\epsilon ,", + "type": "interline_equation", + "image_path": "61739555d0c64d324f6d4bf83880414036bb29d8c6523d02fd3e31e0e9598710.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 276, + 306, + 334, + 320 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 324, + 257, + 336 + ], + "lines": [ + { + "bbox": [ + 106, + 323, + 257, + 337 + ], + "spans": [ + { + "bbox": [ + 106, + 323, + 133, + 337 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 325, + 142, + 334 + ], + "score": 0.36, + "content": "\\hat { w }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 323, + 257, + 337 + ], + "score": 1.0, + "content": "is the learned weight vector.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 106, + 353, + 506, + 390 + ], + "lines": [ + { + "bbox": [ + 105, + 353, + 505, + 367 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 397, + 367 + ], + "score": 1.0, + "content": "Proof. 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1 } - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } } \\\\ & { E _ { 2 } : = \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] . } \\end{array}", + "type": "interline_equation", + "image_path": "aa0dd2ea2c587d7670e09e42775e665a651edebf080c79322e28f0d2bf1e60cf.jpg" + } + ] + } + ], + "index": 32.5, + "virtual_lines": [ + { + "bbox": [ + 245, + 697, + 366, + 714.0 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 245, + 714.0, + 366, + 731.0 + ], + "spans": [], + "index": 33 + } + ] + } + ], + "page_idx": 31, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 106, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 202, + 505, + 213 + ], + "lines": [ + { + "bbox": [ + 495, + 204, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 495, + 204, + 505, + 213 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 761 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 765 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 765 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 15, + "width": 15 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 506, + 119 + ], + "lines": [ + { + "bbox": [ + 105, + 79, + 505, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 79, + 322, + 96 + ], + "score": 1.0, + "content": "Note that we reserve fresh samples for this step, thus", + "type": "text" + }, + { + "bbox": [ + 322, + 83, + 331, + 94 + ], + "score": 0.88, + "content": "\\hat { z } _ { i } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 332, + 79, + 459, + 96 + ], + "score": 1.0, + "content": "is independent with samples in", + "type": "text" + }, + { + "bbox": [ + 460, + 81, + 501, + 95 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 79, + 505, + 96 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 102, + 88, + 509, + 114 + ], + "spans": [ + { + "bbox": [ + 102, + 88, + 132, + 114 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 96, + 240, + 110 + ], + "score": 0.93, + "content": "\\| \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle \\| \\le \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 88, + 306, + 114 + ], + "score": 1.0, + "content": ", we know with", + "type": "text" + }, + { + "bbox": [ + 306, + 94, + 405, + 110 + ], + "score": 0.92, + "content": "O ( \\frac { ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) ^ { 2 } \\log ( d / \\delta ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 88, + 509, + 114 + ], + "score": 1.0, + "content": "i number of samples, we", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 107, + 129, + 121 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 129, + 121 + ], + "score": 1.0, + "content": "have", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1, + "bbox_fs": [ + 102, + 79, + 509, + 121 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 119, + 366, + 135 + ], + "lines": [ + { + "bbox": [ + 244, + 119, + 366, + 135 + ], + "spans": [ + { + "bbox": [ + 244, + 119, + 366, + 135 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\| \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] - \\mathbb { E } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ] \\| \\leq \\epsilon . } \\end{array}", + "type": "interline_equation", + "image_path": "f54d30822e91602a4f37abb5a7ed27529c0b77e1c65ec60b54a8f5ed4bb6e518.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 244, + 119, + 366, + 135 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 139, + 506, + 182 + ], + "lines": [ + { + "bbox": [ + 105, + 138, + 506, + 153 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 181, + 153 + ], + "score": 1.0, + "content": "Overall, we have", + "type": "text" + }, + { + "bbox": [ + 182, + 139, + 382, + 153 + ], + "score": 0.87, + "content": "| \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] - \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ] | \\leq ( 1 + \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 138, + 506, + 153 + ], + "score": 1.0, + "content": ". Combined with the fact that", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 107, + 147, + 510, + 175 + ], + "spans": [ + { + "bbox": [ + 107, + 154, + 176, + 169 + ], + "score": 0.93, + "content": "\\begin{array} { r } { | \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] | \\ge \\frac { \\beta \\gamma } { 2 \\Gamma } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 151, + 261, + 172 + ], + "score": 1.0, + "content": ", we know as long as", + "type": "text" + }, + { + "bbox": [ + 273, + 147, + 510, + 175 + ], + "score": 1.0, + "content": "≤ βγ4Γ(1+ΓP1√k+P2) , with O( (ΓP1√k+P2)2 log(d/δ)\u000f2 ) number", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 170, + 190, + 182 + ], + "spans": [ + { + "bbox": [ + 106, + 170, + 190, + 182 + ], + "score": 1.0, + "content": "of samples, we have", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5, + "bbox_fs": [ + 105, + 138, + 510, + 182 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 217, + 182, + 393, + 198 + ], + "lines": [ + { + "bbox": [ + 217, + 182, + 393, + 198 + ], + "spans": [ + { + "bbox": [ + 217, + 182, + 393, + 198 + ], + "score": 0.9, + "content": "\\operatorname* { P r } [ \\operatorname { s i g n } ( \\mathbb { E } [ \\langle z _ { i } ^ { \\prime } , y \\rangle ] ) \\neq \\operatorname { s i g n } ( \\hat { \\mathbb { E } } [ \\langle \\hat { z } _ { i } ^ { \\prime } , y \\rangle ] ) ] \\leq \\delta .", + "type": "interline_equation", + "image_path": "dd5447c57754b4f8428e24a30f372a7df9a5a16c9ae7fd2522f33a706ebcbf2e.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 217, + 182, + 393, + 198 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "title", + "bbox": [ + 106, + 228, + 398, + 241 + ], + "lines": [ + { + "bbox": [ + 106, + 228, + 399, + 241 + ], + "spans": [ + { + "bbox": [ + 106, + 228, + 399, + 241 + ], + "score": 1.0, + "content": "B.3 ROBUST ANALYSIS FOR RECOVERING FIRST LAYER WEIGHTS", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 107, + 249, + 288, + 262 + ], + "lines": [ + { + "bbox": [ + 106, + 249, + 288, + 263 + ], + "spans": [ + { + "bbox": [ + 106, + 249, + 288, + 263 + ], + "score": 1.0, + "content": "We will first show that Algorithm 1 is robust.", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9, + "bbox_fs": [ + 106, + 249, + 288, + 263 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 264, + 506, + 305 + ], + "lines": [ + { + "bbox": [ + 105, + 263, + 505, + 279 + ], + "spans": [ + { + "bbox": [ + 105, + 263, + 214, + 279 + ], + "score": 1.0, + "content": "Theorem 8. Assume that", + "type": "text" + }, + { + "bbox": [ + 215, + 265, + 340, + 278 + ], + "score": 0.9, + "content": "\\| x \\| \\leq \\Gamma , \\| w \\| \\leq 1 , | \\xi | \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 263, + 361, + 279 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 361, + 265, + 443, + 278 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma .", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 263, + 505, + 279 + ], + "score": 1.0, + "content": ". Then for any", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 271, + 509, + 298 + ], + "spans": [ + { + "bbox": [ + 106, + 280, + 143, + 293 + ], + "score": 0.9, + "content": "\\epsilon \\leq \\gamma / 2", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 271, + 180, + 298 + ], + "score": 1.0, + "content": ", for any", + "type": "text" + }, + { + "bbox": [ + 181, + 281, + 228, + 292 + ], + "score": 0.9, + "content": "1 > \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 271, + 257, + 298 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 258, + 277, + 338, + 295 + ], + "score": 0.92, + "content": "\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 271, + 509, + 298 + ], + "score": 1.0, + "content": "number of i.i.d. samples, we know with", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 104, + 294, + 212, + 306 + ], + "spans": [ + { + "bbox": [ + 104, + 294, + 184, + 306 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 185, + 294, + 207, + 304 + ], + "score": 0.79, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 294, + 212, + 306 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11, + "bbox_fs": [ + 104, + 263, + 509, + 306 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 276, + 306, + 334, + 320 + ], + "lines": [ + { + "bbox": [ + 276, + 306, + 334, + 320 + ], + "spans": [ + { + "bbox": [ + 276, + 306, + 334, + 320 + ], + "score": 0.89, + "content": "\\| \\hat { w } - w \\| \\leq \\epsilon ,", + "type": "interline_equation", + "image_path": "61739555d0c64d324f6d4bf83880414036bb29d8c6523d02fd3e31e0e9598710.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 276, + 306, + 334, + 320 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 324, + 257, + 336 + ], + "lines": [ + { + "bbox": [ + 106, + 323, + 257, + 337 + ], + "spans": [ + { + "bbox": [ + 106, + 323, + 133, + 337 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 325, + 142, + 334 + ], + "score": 0.36, + "content": "\\hat { w }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 323, + 257, + 337 + ], + "score": 1.0, + "content": "is the learned weight vector.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14, + "bbox_fs": [ + 106, + 323, + 257, + 337 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 353, + 506, + 390 + ], + "lines": [ + { + "bbox": [ + 105, + 353, + 505, + 367 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 397, + 367 + ], + "score": 1.0, + "content": "Proof. We first show that given polynomial number of i.i.d. samples,", + "type": "text" + }, + { + "bbox": [ + 397, + 353, + 467, + 366 + ], + "score": 0.92, + "content": "\\| \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 468, + 353, + 505, + 367 + ], + "score": 1.0, + "content": "is upper", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 365, + 504, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 259, + 381 + ], + "score": 1.0, + "content": "bounded with high probability, where", + "type": "text" + }, + { + "bbox": [ + 259, + 366, + 284, + 379 + ], + "score": 0.92, + "content": "{ \\hat { \\mathbb { E } } } [ y x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 365, + 396, + 381 + ], + "score": 1.0, + "content": "is the empirical estimate of", + "type": "text" + }, + { + "bbox": [ + 396, + 367, + 420, + 379 + ], + "score": 0.89, + "content": "\\mathbb { E } [ y x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 365, + 504, + 381 + ], + "score": 1.0, + "content": ". 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Suppose that", + "type": "text" + }, + { + "bbox": [ + 284, + 519, + 398, + 533 + ], + "score": 0.93, + "content": "\\epsilon \\leq \\gamma / 2 \\leq \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) / 2", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 519, + 440, + 534 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 441, + 519, + 472, + 533 + ], + "score": 0.92, + "content": "\\hat { \\mathbb { E } } [ x x ^ { \\top } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 472, + 519, + 506, + 534 + ], + "score": 1.0, + "content": "has full", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 530, + 268, + 544 + ], + "spans": [ + { + "bbox": [ + 106, + 530, + 268, + 544 + ], + "score": 1.0, + "content": "rank. According to Lemma 29, we have", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23, + "bbox_fs": [ + 102, + 496, + 506, + 544 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 159, + 550, + 450, + 579 + ], + "lines": [ + { + "bbox": [ + 159, + 550, + 450, + 579 + ], + "spans": [ + { + "bbox": [ + 159, + 550, + 450, + 579 + ], + "score": 0.92, + "content": "\\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\right\\| \\leq 2 \\sqrt { 2 } \\frac { \\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\right\\| } { \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( \\mathbb { E } [ x x ^ { \\top } ] ) } \\leq 2 \\sqrt { 2 } \\epsilon / \\gamma ^ { 2 } ,", + "type": "interline_equation", + "image_path": "22f21c682d811be3bfc52403d404999a907c0c4ae0fce6d493e9b8c0fc5d4e54.jpg" + } + ] + } + ], + "index": 25, + "virtual_lines": [ + { + "bbox": [ + 159, + 550, + 450, + 579 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 586, + 230, + 598 + ], + "lines": [ + { + "bbox": [ + 105, + 585, + 231, + 599 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 203, + 599 + ], + "score": 1.0, + "content": "with probability at least", + "type": "text" + }, + { + "bbox": [ + 204, + 586, + 226, + 597 + ], + "score": 0.87, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 585, + 231, + 599 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26, + "bbox_fs": [ + 105, + 585, + 231, + 599 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 602, + 504, + 630 + ], + "lines": [ + { + "bbox": [ + 99, + 595, + 511, + 631 + ], + "spans": [ + { + "bbox": [ + 99, + 595, + 183, + 631 + ], + "score": 1.0, + "content": "By union bound, probability at least", + "type": "text" + }, + { + "bbox": [ + 207, + 595, + 250, + 631 + ], + "score": 1.0, + "content": "ow for any , we have", + "type": "text" + }, + { + "bbox": [ + 250, + 606, + 288, + 619 + ], + "score": 0.91, + "content": "\\epsilon \\leq \\gamma / 2", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 595, + 317, + 631 + ], + "score": 1.0, + "content": ", given", + "type": "text" + }, + { + "bbox": [ + 317, + 603, + 398, + 620 + ], + "score": 0.92, + "content": "O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 2 } \\log ( \\frac { d } { \\delta } ) } { \\epsilon ^ { 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 595, + 511, + 631 + ], + "score": 1.0, + "content": "number of samples, with", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 183, + 618, + 206, + 628 + ], + "spans": [ + { + "bbox": [ + 183, + 618, + 206, + 628 + ], + "score": 0.88, + "content": "1 - 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1 } - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } } \\\\ & { E _ { 2 } : = \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ y x ] . } \\end{array}", + "type": "interline_equation", + "image_path": "aa0dd2ea2c587d7670e09e42775e665a651edebf080c79322e28f0d2bf1e60cf.jpg" + } + ] + } + ], + "index": 32.5, + "virtual_lines": [ + { + "bbox": [ + 245, + 697, + 366, + 714.0 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 245, + 714.0, + 366, + 731.0 + ], + "spans": [], + "index": 33 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 167, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 168, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 168, + 95 + ], + "score": 1.0, + "content": "Then, we have", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "interline_equation", + "bbox": [ + 174, + 96, + 436, + 186 + ], + "lines": [ + { + "bbox": [ + 174, + 96, + 436, + 186 + ], + "spans": [ + { + "bbox": [ + 174, + 96, + 436, + 186 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { \\| \\hat { w } - w \\| = 2 \\| \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ y x ] \\| } \\\\ & { \\qquad \\leq 2 \\| E _ { 1 } \\| \\| E _ { 2 } \\| + 2 \\| E _ { 1 } \\| \\| \\mathbb { E } [ y x ] \\| + 2 \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\| \\| E _ { 2 } \\| } \\\\ & { \\qquad \\leq \\frac { 4 \\sqrt { 2 } \\epsilon ^ { 2 } } { \\gamma ^ { 2 } } + \\frac { 4 \\sqrt { 2 } \\left( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma \\right) \\epsilon } { \\gamma ^ { 2 } } + \\frac { 2 \\epsilon } { \\gamma } } \\\\ & { \\qquad \\leq O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) \\epsilon } { \\gamma ^ { 2 } } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "d43302999e5957a981a8601b9d8ccd1cb44e723a3e569b832fbd065611d3b0df.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 174, + 96, + 436, + 126.0 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 174, + 126.0, + 436, + 156.0 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 174, + 156.0, + 436, + 186.0 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 102, + 190, + 479, + 208 + ], + "lines": [ + { + "bbox": [ + 101, + 185, + 484, + 211 + ], + "spans": [ + { + "bbox": [ + 101, + 185, + 155, + 211 + ], + "score": 1.0, + "content": "Thus, given", + "type": "text" + }, + { + "bbox": [ + 156, + 190, + 237, + 209 + ], + "score": 0.93, + "content": "\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 185, + 416, + 211 + ], + "score": 1.0, + "content": "number of samples, with probability at least", + "type": "text" + }, + { + "bbox": [ + 417, + 195, + 440, + 205 + ], + "score": 0.85, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 185, + 484, + 211 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + }, + { + "type": "interline_equation", + "bbox": [ + 275, + 212, + 335, + 227 + ], + "lines": [ + { + "bbox": [ + 275, + 212, + 335, + 227 + ], + "spans": [ + { + "bbox": [ + 275, + 212, + 335, + 227 + ], + "score": 0.89, + "content": "\\| { \\hat { w } } - w \\| \\leq \\epsilon .", + "type": "interline_equation", + "image_path": "ce4e156b04c2b1276da691d7f0e61370f395a4cdab5883f1eb03d4026ad6ca4e.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 275, + 212, + 335, + 227 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 254, + 505, + 302 + ], + "lines": [ + { + "bbox": [ + 105, + 255, + 506, + 267 + ], + "spans": [ + { + "bbox": [ + 105, + 255, + 377, + 267 + ], + "score": 1.0, + "content": "Now let’s go back to the call to Algorithm 1 in Algorithm 3. Let", + "type": "text" + }, + { + "bbox": [ + 378, + 257, + 387, + 266 + ], + "score": 0.85, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 255, + 506, + 267 + ], + "score": 1.0, + "content": "’s be the normalized rows of", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 266, + 504, + 280 + ], + "spans": [ + { + "bbox": [ + 106, + 267, + 126, + 278 + ], + "score": 0.89, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 266, + 158, + 280 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 159, + 268, + 168, + 279 + ], + "score": 0.84, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 266, + 265, + 280 + ], + "score": 1.0, + "content": "’s be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 266, + 266, + 294, + 278 + ], + "score": 0.9, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 266, + 485, + 280 + ], + "score": 1.0, + "content": "(with correct sign). From Lemma 12, we know", + "type": "text" + }, + { + "bbox": [ + 485, + 267, + 504, + 280 + ], + "score": 0.91, + "content": "\\left\\{ \\hat { z } _ { i } \\right\\}", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 278, + 506, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 278, + 156, + 292 + ], + "score": 1.0, + "content": "are close to", + "type": "text" + }, + { + "bbox": [ + 156, + 279, + 175, + 291 + ], + "score": 0.91, + "content": "\\left\\{ z _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 278, + 506, + 292 + ], + "score": 1.0, + "content": "with permutation. Without loss of generality, we assume the permutation here is", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 290, + 380, + 302 + ], + "spans": [ + { + "bbox": [ + 104, + 290, + 263, + 301 + ], + "score": 1.0, + "content": "just an identity mapping, which means", + "type": "text" + }, + { + "bbox": [ + 263, + 290, + 302, + 302 + ], + "score": 0.92, + "content": "\\| z _ { i } - \\hat { z } _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 290, + 371, + 301 + ], + "score": 1.0, + "content": "is small for each", + "type": "text" + }, + { + "bbox": [ + 371, + 290, + 376, + 299 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 290, + 380, + 301 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 7.5 + }, + { + "type": "text", + "bbox": [ + 106, + 306, + 505, + 352 + ], + "lines": [ + { + "bbox": [ + 105, + 305, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 305, + 144, + 320 + ], + "score": 1.0, + "content": "For each", + "type": "text" + }, + { + "bbox": [ + 144, + 308, + 153, + 317 + ], + "score": 0.83, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 305, + 169, + 320 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 170, + 308, + 179, + 317 + ], + "score": 0.85, + "content": "v _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 305, + 427, + 320 + ], + "score": 1.0, + "content": "be the output of Algorithm 1 given infinite number of inputs", + "type": "text" + }, + { + "bbox": [ + 427, + 306, + 462, + 318 + ], + "score": 0.92, + "content": "( x , z _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 305, + 506, + 320 + ], + "score": 1.0, + "content": ". For each", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 318, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 115, + 330 + ], + "score": 0.85, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 318, + 131, + 331 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 132, + 319, + 141, + 330 + ], + "score": 0.88, + "content": "\\hat { v } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 318, + 405, + 331 + ], + "score": 1.0, + "content": "be the output of Algorithm 1 given only finite number of samples", + "type": "text" + }, + { + "bbox": [ + 405, + 318, + 440, + 331 + ], + "score": 0.92, + "content": "( x , \\hat { z } _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 318, + 505, + 331 + ], + "score": 1.0, + "content": ". In this section,", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 330, + 505, + 342 + ], + "spans": [ + { + "bbox": [ + 105, + 330, + 197, + 342 + ], + "score": 1.0, + "content": "we show that suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 330, + 236, + 342 + ], + "score": 0.92, + "content": "\\| z _ { i } - \\hat { z } _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 330, + 436, + 342 + ], + "score": 1.0, + "content": "is bounded, with polynomial number of samples,", + "type": "text" + }, + { + "bbox": [ + 437, + 330, + 475, + 342 + ], + "score": 0.92, + "content": "\\Vert { v } _ { i } - \\hat { v } _ { i } \\Vert", + "type": "inline_equation" + }, + { + "bbox": [ + 476, + 330, + 505, + 342 + ], + "score": 1.0, + "content": "is also", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 339, + 146, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 146, + 352 + ], + "score": 1.0, + "content": "bounded.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 11.5 + }, + { + "type": "text", + "bbox": [ + 106, + 355, + 505, + 426 + ], + "lines": [ + { + "bbox": [ + 105, + 356, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 227, + 370 + ], + "score": 1.0, + "content": "The input for Algorithm 1 is", + "type": "text" + }, + { + "bbox": [ + 227, + 356, + 262, + 370 + ], + "score": 0.92, + "content": "( x , \\hat { z } _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 263, + 356, + 308, + 370 + ], + "score": 1.0, + "content": ". We view", + "type": "text" + }, + { + "bbox": [ + 308, + 356, + 327, + 370 + ], + "score": 0.92, + "content": "\\hat { z } _ { i } ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 356, + 414, + 370 + ], + "score": 1.0, + "content": "as the summation of", + "type": "text" + }, + { + "bbox": [ + 414, + 356, + 433, + 370 + ], + "score": 0.92, + "content": "z _ { i } ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 356, + 506, + 370 + ], + "score": 1.0, + "content": "and a noise term", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 107, + 369, + 505, + 382 + ], + "spans": [ + { + "bbox": [ + 107, + 369, + 156, + 381 + ], + "score": 0.88, + "content": "\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 369, + 312, + 382 + ], + "score": 1.0, + "content": ". Here, the issue is that the noise term", + "type": "text" + }, + { + "bbox": [ + 312, + 369, + 361, + 381 + ], + "score": 0.95, + "content": "\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 369, + 505, + 382 + ], + "score": 1.0, + "content": "is not independent with the sample", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 107, + 379, + 506, + 393 + ], + "spans": [ + { + "bbox": [ + 107, + 381, + 142, + 393 + ], + "score": 0.86, + "content": "( x , \\hat { z } _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 379, + 506, + 393 + ], + "score": 1.0, + "content": ", which makes the robust analysis in Theorem 8 not applicable. On the other hand, since we", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 391, + 505, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 391, + 362, + 404 + ], + "score": 1.0, + "content": "reserve a separate set of samples for Algorithm 1, the estimate", + "type": "text" + }, + { + "bbox": [ + 362, + 392, + 372, + 402 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 391, + 505, + 404 + ], + "score": 1.0, + "content": "is independent with the samples", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 402, + 506, + 417 + ], + "spans": [ + { + "bbox": [ + 107, + 403, + 131, + 416 + ], + "score": 0.91, + "content": "( x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 402, + 302, + 417 + ], + "score": 1.0, + "content": "’s used by Algorithm 1. Thus, the samples", + "type": "text" + }, + { + "bbox": [ + 302, + 402, + 340, + 416 + ], + "score": 0.93, + "content": "( x , \\hat { z _ { i } } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 402, + 506, + 417 + ], + "score": 1.0, + "content": "’s here are still i.i.d., which enables us to", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 415, + 353, + 427 + ], + "spans": [ + { + "bbox": [ + 106, + 415, + 353, + 427 + ], + "score": 1.0, + "content": "use matrix concentration bounds to show the robustness here.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 16.5 + }, + { + "type": "text", + "bbox": [ + 105, + 428, + 505, + 469 + ], + "lines": [ + { + "bbox": [ + 105, + 428, + 506, + 443 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 212, + 443 + ], + "score": 1.0, + "content": "Lemma 13. Assume that", + "type": "text" + }, + { + "bbox": [ + 213, + 429, + 344, + 442 + ], + "score": 0.91, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 428, + 365, + 443 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 365, + 429, + 444, + 442 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 428, + 506, + 443 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 101, + 439, + 507, + 460 + ], + "spans": [ + { + "bbox": [ + 101, + 439, + 507, + 460 + ], + "score": 1.0, + "content": "for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any \u000f ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ4\u000f2 )", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 456, + 412, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 241, + 470 + ], + "score": 1.0, + "content": "number of samples for Algorithm", + "type": "text" + }, + { + "bbox": [ + 241, + 459, + 247, + 467 + ], + "score": 0.48, + "content": "^ { l }", + "type": "inline_equation" + }, + { + "bbox": [ + 247, + 456, + 386, + 470 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 386, + 458, + 408, + 468 + ], + "score": 0.87, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 456, + 412, + 470 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21 + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 473, + 384, + 502 + ], + "lines": [ + { + "bbox": [ + 226, + 473, + 384, + 502 + ], + "spans": [ + { + "bbox": [ + 226, + 473, + 384, + 502 + ], + "score": 0.94, + "content": "\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon ,", + "type": "interline_equation", + "image_path": "bf78139a12b5f94ea68282341113f8a58bbc6c37b9378d4b1f882999543260a7.jpg" + } + ] + } + ], + "index": 23.5, + "virtual_lines": [ + { + "bbox": [ + 226, + 473, + 384, + 487.5 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 226, + 487.5, + 384, + 502.0 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 505, + 186, + 518 + ], + "lines": [ + { + "bbox": [ + 104, + 505, + 187, + 518 + ], + "spans": [ + { + "bbox": [ + 104, + 505, + 141, + 518 + ], + "score": 1.0, + "content": "for each", + "type": "text" + }, + { + "bbox": [ + 142, + 506, + 183, + 517 + ], + "score": 0.9, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 505, + 187, + 518 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 107, + 528, + 504, + 555 + ], + "lines": [ + { + "bbox": [ + 105, + 527, + 504, + 544 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 173, + 544 + ], + "score": 1.0, + "content": "Proof. For any", + "type": "text" + }, + { + "bbox": [ + 173, + 531, + 178, + 540 + ], + "score": 0.75, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 527, + 234, + 544 + ], + "score": 1.0, + "content": ", let’s bound", + "type": "text" + }, + { + "bbox": [ + 235, + 529, + 277, + 542 + ], + "score": 0.93, + "content": "\\| v _ { i } \\ - \\hat { v } _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 527, + 347, + 544 + ], + "score": 1.0, + "content": ". As we know,", + "type": "text" + }, + { + "bbox": [ + 348, + 528, + 458, + 542 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\boldsymbol { v } _ { i } ~ = ~ 2 { \\mathbb E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } { \\mathbb E } [ z _ { i } ^ { \\top } \\boldsymbol { y } \\boldsymbol { x } ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 527, + 480, + 544 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 480, + 530, + 504, + 541 + ], + "score": 0.87, + "content": "\\begin{array} { r l } { \\hat { v } _ { i } } & { { } = } \\end{array}", + "type": "inline_equation" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 540, + 422, + 556 + ], + "spans": [ + { + "bbox": [ + 106, + 541, + 189, + 555 + ], + "score": 0.92, + "content": "2 \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 540, + 289, + 556 + ], + "score": 1.0, + "content": ". 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By similar anal-", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 104, + 689, + 506, + 713 + ], + "spans": [ + { + "bbox": [ + 104, + 689, + 250, + 713 + ], + "score": 1.0, + "content": "ysis of Theorem 1, we know given", + "type": "text" + }, + { + "bbox": [ + 250, + 693, + 331, + 711 + ], + "score": 0.94, + "content": "\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 689, + 506, + 713 + ], + "score": 1.0, + "content": "number of i.i.d. samples, with probability", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 709, + 164, + 721 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 137, + 721 + ], + "score": 1.0, + "content": "at least", + "type": "text" + }, + { + "bbox": [ + 137, + 709, + 160, + 720 + ], + "score": 0.82, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 709, + 164, + 721 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35 + }, + { + "type": "interline_equation", + "bbox": [ + 207, + 717, + 404, + 734 + ], + "lines": [ + { + "bbox": [ + 207, + 717, + 404, + 734 + ], + "spans": [ + { + "bbox": [ + 207, + 717, + 404, + 734 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\big \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ] \\big \\| \\leq \\epsilon . } \\end{array}", + "type": "interline_equation", + "image_path": "fc077f031385442a0238cf2ebde1edf67a7bd2b1ee6d4e143d241d3ad31e7f73.jpg" + } + ] + } + ], + "index": 37, + "virtual_lines": [ + { + "bbox": [ + 207, + 717, + 404, + 734 + ], + "spans": [], + "index": 37 + } + ] + } + ], + "page_idx": 32, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "33", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 231, + 505, + 242 + ], + "lines": [ + { + "bbox": [ + 495, + 233, + 505, + 243 + ], + "spans": [ + { + "bbox": [ + 495, + 233, + 505, + 243 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 167, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 168, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 168, + 95 + ], + "score": 1.0, + "content": "Then, we have", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0, + "bbox_fs": [ + 105, + 81, + 168, + 95 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 174, + 96, + 436, + 186 + ], + "lines": [ + { + "bbox": [ + 174, + 96, + 436, + 186 + ], + "spans": [ + { + "bbox": [ + 174, + 96, + 436, + 186 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { \\| \\hat { w } - w \\| = 2 \\| \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ y x ] \\| } \\\\ & { \\qquad \\leq 2 \\| E _ { 1 } \\| \\| E _ { 2 } \\| + 2 \\| E _ { 1 } \\| \\| \\mathbb { E } [ y x ] \\| + 2 \\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\| \\| E _ { 2 } \\| } \\\\ & { \\qquad \\leq \\frac { 4 \\sqrt { 2 } \\epsilon ^ { 2 } } { \\gamma ^ { 2 } } + \\frac { 4 \\sqrt { 2 } \\left( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma \\right) \\epsilon } { \\gamma ^ { 2 } } + \\frac { 2 \\epsilon } { \\gamma } } \\\\ & { \\qquad \\leq O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) \\epsilon } { \\gamma ^ { 2 } } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "d43302999e5957a981a8601b9d8ccd1cb44e723a3e569b832fbd065611d3b0df.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 174, + 96, + 436, + 126.0 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 174, + 126.0, + 436, + 156.0 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 174, + 156.0, + 436, + 186.0 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 102, + 190, + 479, + 208 + ], + "lines": [ + { + "bbox": [ + 101, + 185, + 484, + 211 + ], + "spans": [ + { + "bbox": [ + 101, + 185, + 155, + 211 + ], + "score": 1.0, + "content": "Thus, given", + "type": "text" + }, + { + "bbox": [ + 156, + 190, + 237, + 209 + ], + "score": 0.93, + "content": "\\begin{array} { r } { O ( \\frac { ( \\Gamma ^ { 2 } + P _ { 2 } \\Gamma ) ^ { 4 } \\log ( \\frac { d } { \\delta } ) } { \\gamma ^ { 4 } \\epsilon ^ { 2 } } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 185, + 416, + 211 + ], + "score": 1.0, + "content": "number of samples, with probability at least", + "type": "text" + }, + { + "bbox": [ + 417, + 195, + 440, + 205 + ], + "score": 0.85, + "content": "1 - 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Let", + "type": "text" + }, + { + "bbox": [ + 378, + 257, + 387, + 266 + ], + "score": 0.85, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 255, + 506, + 267 + ], + "score": 1.0, + "content": "’s be the normalized rows of", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 266, + 504, + 280 + ], + "spans": [ + { + "bbox": [ + 106, + 267, + 126, + 278 + ], + "score": 0.89, + "content": "A ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 266, + 158, + 280 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 159, + 268, + 168, + 279 + ], + "score": 0.84, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 266, + 265, + 280 + ], + "score": 1.0, + "content": "’s be the eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 266, + 266, + 294, + 278 + ], + "score": 0.9, + "content": "\\hat { X } \\hat { Y } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 266, + 485, + 280 + ], + "score": 1.0, + "content": "(with correct sign). From Lemma 12, we know", + "type": "text" + }, + { + "bbox": [ + 485, + 267, + 504, + 280 + ], + "score": 0.91, + "content": "\\left\\{ \\hat { z } _ { i } \\right\\}", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 278, + 506, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 278, + 156, + 292 + ], + "score": 1.0, + "content": "are close to", + "type": "text" + }, + { + "bbox": [ + 156, + 279, + 175, + 291 + ], + "score": 0.91, + "content": "\\left\\{ z _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 278, + 506, + 292 + ], + "score": 1.0, + "content": "with permutation. Without loss of generality, we assume the permutation here is", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 290, + 380, + 302 + ], + "spans": [ + { + "bbox": [ + 104, + 290, + 263, + 301 + ], + "score": 1.0, + "content": "just an identity mapping, which means", + "type": "text" + }, + { + "bbox": [ + 263, + 290, + 302, + 302 + ], + "score": 0.92, + "content": "\\| z _ { i } - \\hat { z } _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 290, + 371, + 301 + ], + "score": 1.0, + "content": "is small for each", + "type": "text" + }, + { + "bbox": [ + 371, + 290, + 376, + 299 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 290, + 380, + 301 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 7.5, + "bbox_fs": [ + 104, + 255, + 506, + 302 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 306, + 505, + 352 + ], + "lines": [ + { + "bbox": [ + 105, + 305, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 305, + 144, + 320 + ], + "score": 1.0, + "content": "For each", + "type": "text" + }, + { + "bbox": [ + 144, + 308, + 153, + 317 + ], + "score": 0.83, + "content": "z _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 305, + 169, + 320 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 170, + 308, + 179, + 317 + ], + "score": 0.85, + "content": "v _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 305, + 427, + 320 + ], + "score": 1.0, + "content": "be the output of Algorithm 1 given infinite number of inputs", + "type": "text" + }, + { + "bbox": [ + 427, + 306, + 462, + 318 + ], + "score": 0.92, + "content": "( x , z _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 305, + 506, + 320 + ], + "score": 1.0, + "content": ". For each", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 318, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 115, + 330 + ], + "score": 0.85, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 318, + 131, + 331 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 132, + 319, + 141, + 330 + ], + "score": 0.88, + "content": "\\hat { v } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 318, + 405, + 331 + ], + "score": 1.0, + "content": "be the output of Algorithm 1 given only finite number of samples", + "type": "text" + }, + { + "bbox": [ + 405, + 318, + 440, + 331 + ], + "score": 0.92, + "content": "( x , \\hat { z } _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 318, + 505, + 331 + ], + "score": 1.0, + "content": ". In this section,", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 330, + 505, + 342 + ], + "spans": [ + { + "bbox": [ + 105, + 330, + 197, + 342 + ], + "score": 1.0, + "content": "we show that suppose", + "type": "text" + }, + { + "bbox": [ + 197, + 330, + 236, + 342 + ], + "score": 0.92, + "content": "\\| z _ { i } - \\hat { z } _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 330, + 436, + 342 + ], + "score": 1.0, + "content": "is bounded, with polynomial number of samples,", + "type": "text" + }, + { + "bbox": [ + 437, + 330, + 475, + 342 + ], + "score": 0.92, + "content": "\\Vert { v } _ { i } - \\hat { v } _ { i } \\Vert", + "type": "inline_equation" + }, + { + "bbox": [ + 476, + 330, + 505, + 342 + ], + "score": 1.0, + "content": "is also", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 339, + 146, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 146, + 352 + ], + "score": 1.0, + "content": "bounded.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 11.5, + "bbox_fs": [ + 105, + 305, + 506, + 352 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 355, + 505, + 426 + ], + "lines": [ + { + "bbox": [ + 105, + 356, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 227, + 370 + ], + "score": 1.0, + "content": "The input for Algorithm 1 is", + "type": "text" + }, + { + "bbox": [ + 227, + 356, + 262, + 370 + ], + "score": 0.92, + "content": "( x , \\hat { z } _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 263, + 356, + 308, + 370 + ], + "score": 1.0, + "content": ". We view", + "type": "text" + }, + { + "bbox": [ + 308, + 356, + 327, + 370 + ], + "score": 0.92, + "content": "\\hat { z } _ { i } ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 356, + 414, + 370 + ], + "score": 1.0, + "content": "as the summation of", + "type": "text" + }, + { + "bbox": [ + 414, + 356, + 433, + 370 + ], + "score": 0.92, + "content": "z _ { i } ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 356, + 506, + 370 + ], + "score": 1.0, + "content": "and a noise term", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 107, + 369, + 505, + 382 + ], + "spans": [ + { + "bbox": [ + 107, + 369, + 156, + 381 + ], + "score": 0.88, + "content": "\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 369, + 312, + 382 + ], + "score": 1.0, + "content": ". Here, the issue is that the noise term", + "type": "text" + }, + { + "bbox": [ + 312, + 369, + 361, + 381 + ], + "score": 0.95, + "content": "\\left( \\hat { z } _ { i } - z _ { i } \\right) ^ { \\top } y", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 369, + 505, + 382 + ], + "score": 1.0, + "content": "is not independent with the sample", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 107, + 379, + 506, + 393 + ], + "spans": [ + { + "bbox": [ + 107, + 381, + 142, + 393 + ], + "score": 0.86, + "content": "( x , \\hat { z } _ { i } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 379, + 506, + 393 + ], + "score": 1.0, + "content": ", which makes the robust analysis in Theorem 8 not applicable. On the other hand, since we", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 391, + 505, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 391, + 362, + 404 + ], + "score": 1.0, + "content": "reserve a separate set of samples for Algorithm 1, the estimate", + "type": "text" + }, + { + "bbox": [ + 362, + 392, + 372, + 402 + ], + "score": 0.87, + "content": "\\hat { z } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 391, + 505, + 404 + ], + "score": 1.0, + "content": "is independent with the samples", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 402, + 506, + 417 + ], + "spans": [ + { + "bbox": [ + 107, + 403, + 131, + 416 + ], + "score": 0.91, + "content": "( x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 402, + 302, + 417 + ], + "score": 1.0, + "content": "’s used by Algorithm 1. Thus, the samples", + "type": "text" + }, + { + "bbox": [ + 302, + 402, + 340, + 416 + ], + "score": 0.93, + "content": "( x , \\hat { z _ { i } } ^ { \\top } y )", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 402, + 506, + 417 + ], + "score": 1.0, + "content": "’s here are still i.i.d., which enables us to", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 415, + 353, + 427 + ], + "spans": [ + { + "bbox": [ + 106, + 415, + 353, + 427 + ], + "score": 1.0, + "content": "use matrix concentration bounds to show the robustness here.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 16.5, + "bbox_fs": [ + 105, + 356, + 506, + 427 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 428, + 505, + 469 + ], + "lines": [ + { + "bbox": [ + 105, + 428, + 506, + 443 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 212, + 443 + ], + "score": 1.0, + "content": "Lemma 13. Assume that", + "type": "text" + }, + { + "bbox": [ + 213, + 429, + 344, + 442 + ], + "score": 0.91, + "content": "\\| x \\| \\leq \\Gamma , \\| A \\| \\leq P _ { 1 } , \\| \\xi \\| \\leq P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 428, + 365, + 443 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 365, + 429, + 444, + 442 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) \\geq \\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 428, + 506, + 443 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 101, + 439, + 507, + 460 + ], + "spans": [ + { + "bbox": [ + 101, + 439, + 507, + 460 + ], + "score": 1.0, + "content": "for each 1 ≤ i ≤ k, kzˆi − zik ≤ τ . Then for any \u000f ≤ γ/2 and δ < 1, given O( (Γ2+P2Γ)4 log( dδ )γ4\u000f2 )", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 456, + 412, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 241, + 470 + ], + "score": 1.0, + "content": "number of samples for Algorithm", + "type": "text" + }, + { + "bbox": [ + 241, + 459, + 247, + 467 + ], + "score": 0.48, + "content": "^ { l }", + "type": "inline_equation" + }, + { + "bbox": [ + 247, + 456, + 386, + 470 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 386, + 458, + 408, + 468 + ], + "score": 0.87, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 456, + 412, + 470 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21, + "bbox_fs": [ + 101, + 428, + 507, + 470 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 473, + 384, + 502 + ], + "lines": [ + { + "bbox": [ + 226, + 473, + 384, + 502 + ], + "spans": [ + { + "bbox": [ + 226, + 473, + 384, + 502 + ], + "score": 0.94, + "content": "\\| v _ { i } - \\hat { v } _ { i } \\| \\leq \\frac { 2 \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } + 2 \\epsilon ,", + "type": "interline_equation", + "image_path": "bf78139a12b5f94ea68282341113f8a58bbc6c37b9378d4b1f882999543260a7.jpg" + } + ] + } + ], + "index": 23.5, + "virtual_lines": [ + { + "bbox": [ + 226, + 473, + 384, + 487.5 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 226, + 487.5, + 384, + 502.0 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 505, + 186, + 518 + ], + "lines": [ + { + "bbox": [ + 104, + 505, + 187, + 518 + ], + "spans": [ + { + "bbox": [ + 104, + 505, + 141, + 518 + ], + "score": 1.0, + "content": "for each", + "type": "text" + }, + { + "bbox": [ + 142, + 506, + 183, + 517 + ], + "score": 0.9, + "content": "1 \\leq i \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 505, + 187, + 518 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25, + "bbox_fs": [ + 104, + 505, + 187, + 518 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 528, + 504, + 555 + ], + "lines": [ + { + "bbox": [ + 105, + 527, + 504, + 544 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 173, + 544 + ], + "score": 1.0, + "content": "Proof. For any", + "type": "text" + }, + { + "bbox": [ + 173, + 531, + 178, + 540 + ], + "score": 0.75, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 527, + 234, + 544 + ], + "score": 1.0, + "content": ", let’s bound", + "type": "text" + }, + { + "bbox": [ + 235, + 529, + 277, + 542 + ], + "score": 0.93, + "content": "\\| v _ { i } \\ - \\hat { v } _ { i } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 527, + 347, + 544 + ], + "score": 1.0, + "content": ". As we know,", + "type": "text" + }, + { + "bbox": [ + 348, + 528, + 458, + 542 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\boldsymbol { v } _ { i } ~ = ~ 2 { \\mathbb E } [ \\boldsymbol { x } \\boldsymbol { x } ^ { \\top } ] ^ { - 1 } { \\mathbb E } [ z _ { i } ^ { \\top } \\boldsymbol { y } \\boldsymbol { x } ] } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 527, + 480, + 544 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 480, + 530, + 504, + 541 + ], + "score": 0.87, + "content": "\\begin{array} { r l } { \\hat { v } _ { i } } & { { } = } \\end{array}", + "type": "inline_equation" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 540, + 422, + 556 + ], + "spans": [ + { + "bbox": [ + 106, + 541, + 189, + 555 + ], + "score": 0.92, + "content": "2 \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 540, + 289, + 556 + ], + "score": 1.0, + "content": ". Thus, in order to bound", + "type": "text" + }, + { + "bbox": [ + 290, + 542, + 329, + 555 + ], + "score": 0.93, + "content": "\\Vert { v } _ { i } - \\hat { v } _ { i } \\Vert", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 540, + 422, + 556 + ], + "score": 1.0, + "content": ", we only need to show", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26.5, + "bbox_fs": [ + 105, + 527, + 504, + 556 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 119, + 559, + 492, + 576 + ], + "lines": [ + { + "bbox": [ + 119, + 559, + 492, + 576 + ], + "spans": [ + { + "bbox": [ + 119, + 559, + 492, + 576 + ], + "score": 0.88, + "content": "\\left| \\left| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ z _ { i } ^ { \\top } y x ] \\right| \\right| \\mathrm { ~ a n d ~ } \\left| \\left| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } \\hat { \\mathbb { E } } [ \\hat { z } _ { i } ^ { \\top } y x ] \\right| \\right|", + "type": "interline_equation", + "image_path": "221b2ef716a42f07c351281fc9e247af72721a45dd89b69c1a7818a4e568a38e.jpg" + } + ] + } + ], + "index": 28, + "virtual_lines": [ + { + "bbox": [ + 119, + 559, + 492, + 576 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 579, + 180, + 591 + ], + "lines": [ + { + "bbox": [ + 106, + 578, + 180, + 592 + ], + "spans": [ + { + "bbox": [ + 106, + 578, + 180, + 592 + ], + "score": 1.0, + "content": "are both bounded.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29, + "bbox_fs": [ + 106, + 578, + 180, + 592 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 596, + 272, + 608 + ], + "lines": [ + { + "bbox": [ + 106, + 595, + 274, + 609 + ], + "spans": [ + { + "bbox": [ + 106, + 595, + 274, + 609 + ], + "score": 1.0, + "content": "The first term can be bounded as follows.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 30, + "bbox_fs": [ + 106, + 595, + 274, + 609 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 123, + 609, + 487, + 674 + ], + "lines": [ + { + "bbox": [ + 123, + 609, + 487, + 674 + ], + "spans": [ + { + "bbox": [ + 123, + 609, + 487, + 674 + ], + "score": 0.93, + "content": "\\begin{array} { r l } { \\left\\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ \\hat { z } _ { i } ^ { \\top } y x ] - \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ z _ { i } ^ { \\top } y x ] \\right\\| } & { = \\left\\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\mathbb { E } [ ( \\hat { z } _ { i } - z _ { i } ) ^ { \\top } y x ] \\right\\| } \\\\ & { \\leq \\left\\| \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } \\right\\| \\left\\| \\hat { z } _ { i } - z _ { i } \\right\\| \\left\\| A \\sigma ( W x ) + \\xi \\right\\| \\left\\| x \\right\\| } \\\\ & { \\leq \\frac { \\tau ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) \\Gamma } { \\gamma } } \\end{array}", + "type": "interline_equation", + "image_path": "67ba24a6c25a8bb15b8c41729c8f2e249fdea2394c75fa8e074ef724eb8c4447.jpg" + } + ] + } + ], + "index": 32, + "virtual_lines": [ + { + "bbox": [ + 123, + 609, + 487, + 630.6666666666666 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 123, + 630.6666666666666, + 487, + 652.3333333333333 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 123, + 652.3333333333333, + 487, + 673.9999999999999 + ], + "spans": [], + "index": 33 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 681, + 505, + 720 + ], + "lines": [ + { + "bbox": [ + 106, + 681, + 505, + 694 + ], + "spans": [ + { + "bbox": [ + 106, + 681, + 505, + 694 + ], + "score": 1.0, + "content": "We can use standard matrix concentration bounds to upper bound the second term. 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1 } - \\hat { Z } ^ { - 1 } } \\\\ { E _ { 2 } : = V - \\hat { V } . } \\end{array}", + "type": "interline_equation", + "image_path": "7c48554ec6dd87a61f33c2bc1bc57ffa8c631ba2f0aa778c0d795430d250abf1.jpg" + } + ] + } + ], + "index": 26.5, + "virtual_lines": [ + { + "bbox": [ + 266, + 489, + 344, + 505.0 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 266, + 505.0, + 344, + 521.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 523, + 502, + 547 + ], + "lines": [ + { + "bbox": [ + 105, + 522, + 505, + 538 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 148, + 538 + ], + "score": 1.0, + "content": "We know", + "type": "text" + }, + { + "bbox": [ + 148, + 523, + 250, + 537 + ], + "score": 0.93, + "content": "\\| E _ { 1 } \\| \\le 2 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\sqrt { k } \\epsilon / \\beta ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 522, + 271, + 538 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 271, + 523, + 327, + 537 + ], + "score": 0.92, + "content": "\\| E _ { 2 } \\| \\le \\sqrt { k } \\epsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 522, + 407, + 538 + ], + "score": 1.0, + "content": ". In order to bound", + "type": "text" + }, + { + "bbox": [ + 407, + 525, + 425, + 537 + ], + "score": 0.92, + "content": "\\| V \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 522, + 505, + 538 + ], + "score": 1.0, + "content": ", we can bound the", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 536, + 244, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 244, + 549 + ], + "score": 1.0, + "content": "norm of its row vectors. 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1 } \\sigma ( V x )", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 719, + 459, + 733 + ], + "score": 1.0, + "content": ", as shown in Theorem 5.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 40 + } + ], + "page_idx": 33, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 749, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 298, + 749, + 313, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 15, + "width": 15 + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 217, + 505, + 227 + ], + "lines": [ + { + "bbox": [ + 496, + 218, + 505, + 228 + ], + "spans": [ + { + "bbox": [ + 496, + 218, + 505, + 228 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 721, + 504, + 731 + ], + "lines": [ + { + "bbox": [ + 496, + 722, + 504, + 732 + ], + "spans": [ + { + "bbox": [ + 496, + 722, + 504, + 732 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 176, + 93 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 177, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 177, + 95 + ], + "score": 1.0, + "content": "Overall, we have", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0, + "bbox_fs": [ + 106, + 82, + 177, + 95 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 92, + 514, + 158 + ], + "lines": [ + { + "bbox": [ + 111, + 92, + 514, + 158 + ], + "spans": [ + { + "bbox": [ + 111, + 92, + 514, + 158 + ], + "score": 0.86, + "content": "\\begin{array} { r l } & { v _ { i } - 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In order to bound", + "type": "text" + }, + { + "bbox": [ + 407, + 525, + 425, + 537 + ], + "score": 0.92, + "content": "\\| V \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 522, + 505, + 538 + ], + "score": 1.0, + "content": ", we can bound the", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 536, + 244, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 244, + 549 + ], + "score": 1.0, + "content": "norm of its row vectors. We have,", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28.5, + "bbox_fs": [ + 105, + 522, + 505, + 549 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 546, + 366, + 592 + ], + "lines": [ + { + "bbox": [ + 244, + 546, + 366, + 592 + ], + "spans": [ + { + "bbox": [ + 244, + 546, + 366, + 592 + ], + "score": 0.9, + "content": "\\begin{array} { r l } & { \\| v _ { i } \\| = \\| 2 \\mathbb E [ x x ^ { \\top } ] ^ { - 1 } \\mathbb E [ z _ { i } ^ { \\top } y x ] \\| } \\\\ & { ~ \\leq \\frac { 2 \\Gamma ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) } { \\gamma } , } \\end{array}", + "type": "interline_equation", + "image_path": "4b901d099ef4023339d5d1b47deba42dfdf7a6ace5d4c205846dc09288779be8.jpg" + } + ] + } + ], + "index": 30.5, + "virtual_lines": [ + { + "bbox": [ + 244, + 546, + 366, + 569.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 244, + 569.0, + 366, + 592.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 594, + 504, + 611 + ], + "lines": [ + { + "bbox": [ + 102, + 589, + 509, + 613 + ], + "spans": [ + { + "bbox": [ + 102, + 589, + 164, + 613 + ], + "score": 1.0, + "content": "which implies", + "type": "text" + }, + { + "bbox": [ + 165, + 594, + 265, + 612 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\| V \\| \\le \\frac { 2 \\sqrt { k } \\Gamma ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) } { \\gamma } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 589, + 347, + 613 + ], + "score": 1.0, + "content": ". Now we can bound", + "type": "text" + }, + { + "bbox": [ + 347, + 595, + 459, + 609 + ], + "score": 0.92, + "content": "\\| Z ^ { - 1 } \\sigma ( V x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 589, + 509, + 613 + ], + "score": 1.0, + "content": "as follows.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 32, + "bbox_fs": [ + 102, + 589, + 509, + 613 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 126, + 612, + 484, + 658 + ], + "lines": [ + { + "bbox": [ + 126, + 612, + 484, + 658 + ], + "spans": [ + { + "bbox": [ + 126, + 612, + 484, + 658 + ], + "score": 0.86, + "content": "\\begin{array} { r l } & { \\| Z ^ { - 1 } \\sigma ( V x ) - \\hat { Z } ^ { - 1 } \\sigma ( \\hat { V } x ) \\| \\le \\| E _ { 1 } \\| \\| E _ { 2 } x \\| + \\| E _ { 1 } \\| \\| V x \\| + \\| Z ^ { - 1 } \\| \\| E _ { 2 } x \\| } \\\\ & { \\qquad \\le \\frac { 2 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\Gamma k \\epsilon ^ { 2 } } { \\beta ^ { 2 } } + \\frac { 4 \\sqrt { 2 } P _ { 1 } ^ { 2 } \\Gamma ^ { 2 } ( \\Gamma P _ { 1 } \\sqrt { k } + P _ { 2 } ) k \\epsilon } { \\beta ^ { 2 } \\gamma } + \\frac { P _ { 1 } \\Gamma \\sqrt { k } \\epsilon } { \\beta } , } \\end{array}", + "type": "interline_equation", + "image_path": "f5a7eb72e883c0a07e1bd095b7f258af127358df108cd8c19899de2180ccb015.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 126, + 612, + 484, + 627.3333333333334 + ], + "spans": [], + "index": 33 + }, + { + "bbox": [ + 126, + 627.3333333333334, + 484, + 642.6666666666667 + ], + "spans": [], + "index": 34 + }, + { + "bbox": [ + 126, + 642.6666666666667, + 484, + 658.0000000000001 + ], + "spans": [], + "index": 35 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 660, + 493, + 674 + ], + "lines": [ + { + "bbox": [ + 105, + 659, + 492, + 675 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 255, + 675 + ], + "score": 1.0, + "content": "where the first inequality holds since", + "type": "text" + }, + { + "bbox": [ + 256, + 660, + 331, + 673 + ], + "score": 0.93, + "content": "\\| \\sigma ( V x ) \\| \\leq \\| V x \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 659, + 349, + 675 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 349, + 659, + 492, + 673 + ], + "score": 0.86, + "content": "\\| \\sigma ( { \\hat { V } } x ) - \\sigma ( V x ) \\| \\leq \\| { \\hat { V } } x - V x \\| .", + "type": "inline_equation" + } + ], + "index": 36 + } + ], + "index": 36, + "bbox_fs": [ + 105, + 659, + 492, + 675 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 677, + 505, + 701 + ], + "lines": [ + { + "bbox": [ + 105, + 677, + 506, + 693 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 217, + 693 + ], + "score": 1.0, + "content": "Thus, we know given poly", + "type": "text" + }, + { + "bbox": [ + 218, + 678, + 372, + 691 + ], + "score": 0.87, + "content": "\\left( \\Gamma , P _ { 1 } , P _ { 2 } , d , 1 / \\epsilon , 1 / \\gamma , 1 / \\alpha , 1 / \\beta , 1 / \\delta \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 373, + 677, + 506, + 693 + ], + "score": 1.0, + "content": "number of i.i.d. samples, with", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 689, + 211, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 689, + 183, + 702 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 690, + 206, + 700 + ], + "score": 0.88, + "content": "1 - \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 689, + 211, + 702 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37.5, + "bbox_fs": [ + 105, + 677, + 506, + 702 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 178, + 703, + 433, + 718 + ], + "lines": [ + { + "bbox": [ + 178, + 703, + 433, + 718 + ], + "spans": [ + { + "bbox": [ + 178, + 703, + 433, + 718 + ], + "score": 0.85, + "content": "\\lVert A \\boldsymbol { \\sigma } ( W \\boldsymbol { x } ) - \\hat { Z } ^ { - 1 } \\boldsymbol { \\sigma } ( \\hat { V } \\boldsymbol { x } ) \\rVert = \\lVert Z ^ { - 1 } \\boldsymbol { \\sigma } ( V \\boldsymbol { x } ) - \\hat { Z } ^ { - 1 } \\boldsymbol { \\sigma } ( \\hat { V } \\boldsymbol { x } ) \\rVert \\leq \\epsilon ,", + "type": "interline_equation", + "image_path": "91a549cb91a84ebe2cde811461ad72c22ddd9e298d281bab8300fce7666dff7f.jpg" + } + ] + } + ], + "index": 39, + "virtual_lines": [ + { + "bbox": [ + 178, + 703, + 433, + 718 + ], + "spans": [], + "index": 39 + } + ] + }, + { + "type": "text", + "bbox": [ + 104, + 720, + 458, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 719, + 459, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 259, + 733 + ], + "score": 1.0, + "content": "where the first equality holds because", + "type": "text" + }, + { + "bbox": [ + 259, + 720, + 356, + 732 + ], + "score": 0.94, + "content": "A \\sigma ( W x ) = Z ^ { - 1 } \\sigma ( V x )", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 719, + 459, + 733 + ], + "score": 1.0, + "content": ", as shown in Theorem 5.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 40, + "bbox_fs": [ + 105, + 719, + 459, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 106, + 81, + 414, + 94 + ], + "lines": [ + { + "bbox": [ + 106, + 79, + 415, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 79, + 415, + 96 + ], + "score": 1.0, + "content": "C SMOOTHED ANALYSIS FOR DISTINGUISHING MATRICES", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 107, + 105, + 505, + 240 + ], + "lines": [ + { + "bbox": [ + 105, + 106, + 504, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 462, + 118 + ], + "score": 1.0, + "content": "In smoothed analysis, it’s clear that after adding small Gaussian perturbations, matrix", + "type": "text" + }, + { + "bbox": [ + 463, + 106, + 471, + 117 + ], + "score": 0.7, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 472, + 106, + 491, + 118 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 492, + 106, + 504, + 117 + ], + "score": 0.61, + "content": "W", + "type": "inline_equation" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 117, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 117, + 505, + 129 + ], + "score": 1.0, + "content": "will become robustly full rank with reasonable probability (Lemma 36). In this section, we will", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 128, + 505, + 141 + ], + "spans": [ + { + "bbox": [ + 105, + 128, + 505, + 141 + ], + "score": 1.0, + "content": "focus on the tricky part, using smoothed analysis framework to show that it is natural to assume", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 139, + 505, + 151 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 505, + 151 + ], + "score": 1.0, + "content": "the distinguishing matrix is robustly full rank. We will consider two settings. In the first case, the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 150, + 505, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 150, + 294, + 163 + ], + "score": 1.0, + "content": "input distribution is the Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 294, + 150, + 331, + 162 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 150, + 505, + 163 + ], + "score": 1.0, + "content": ", and the weights for the first layer matrix", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 107, + 160, + 505, + 174 + ], + "spans": [ + { + "bbox": [ + 107, + 161, + 118, + 171 + ], + "score": 0.58, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 119, + 160, + 505, + 174 + ], + "score": 1.0, + "content": "is perturbed by a small Gaussian noise. In this case we show that the augmented distinguishing", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 171, + 506, + 186 + ], + "spans": [ + { + "bbox": [ + 104, + 171, + 136, + 186 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 136, + 172, + 148, + 182 + ], + "score": 0.76, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 171, + 262, + 186 + ], + "score": 1.0, + "content": "has smallest singular value", + "type": "text" + }, + { + "bbox": [ + 263, + 172, + 302, + 184 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M )", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 171, + 506, + 186 + ], + "score": 1.0, + "content": "that depends polynomially on the dimension and", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 182, + 506, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 182, + 430, + 196 + ], + "score": 1.0, + "content": "the amount of perturbation. This shows that for the Gaussian input distribution,", + "type": "text" + }, + { + "bbox": [ + 430, + 183, + 469, + 195 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M )", + "type": "inline_equation" + }, + { + "bbox": [ + 469, + 182, + 506, + 196 + ], + "score": 1.0, + "content": "is lower", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 193, + 506, + 207 + ], + "spans": [ + { + "bbox": [ + 105, + 193, + 189, + 207 + ], + "score": 1.0, + "content": "bounded as long as", + "type": "text" + }, + { + "bbox": [ + 189, + 194, + 201, + 204 + ], + "score": 0.56, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 193, + 506, + 207 + ], + "score": 1.0, + "content": "is in general position. In the second case, we will fix a full rank weight", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 205, + 506, + 218 + ], + "spans": [ + { + "bbox": [ + 105, + 205, + 135, + 218 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 136, + 205, + 147, + 215 + ], + "score": 0.71, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 148, + 205, + 374, + 218 + ], + "score": 1.0, + "content": ", and consider an arbitrary symmetric input distribution", + "type": "text" + }, + { + "bbox": [ + 374, + 205, + 383, + 215 + ], + "score": 0.82, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 205, + 506, + 218 + ], + "score": 1.0, + "content": ". There is no standard way of", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 216, + 506, + 228 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 371, + 228 + ], + "score": 1.0, + "content": "perturbing a symmetric distribution, we give a simple perturbation", + "type": "text" + }, + { + "bbox": [ + 372, + 216, + 383, + 226 + ], + "score": 0.87, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 216, + 506, + 228 + ], + "score": 1.0, + "content": "that can be arbitrarily close to", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 227, + 299, + 240 + ], + "spans": [ + { + "bbox": [ + 106, + 228, + 115, + 238 + ], + "score": 0.76, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 227, + 178, + 240 + ], + "score": 1.0, + "content": ", and prove that", + "type": "text" + }, + { + "bbox": [ + 179, + 227, + 227, + 240 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 227, + 299, + 240 + ], + "score": 1.0, + "content": "is lowerbounded.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 6.5 + }, + { + "type": "text", + "bbox": [ + 107, + 251, + 504, + 277 + ], + "lines": [ + { + "bbox": [ + 106, + 251, + 505, + 264 + ], + "spans": [ + { + "bbox": [ + 106, + 251, + 156, + 264 + ], + "score": 1.0, + "content": "Perturbing", + "type": "text" + }, + { + "bbox": [ + 157, + 252, + 169, + 263 + ], + "score": 0.6, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 169, + 251, + 505, + 264 + ], + "score": 1.0, + "content": "for Gaussian Input We first consider the case when the input follows standard", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 263, + 425, + 277 + ], + "spans": [ + { + "bbox": [ + 105, + 264, + 194, + 277 + ], + "score": 1.0, + "content": "Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 194, + 264, + 231, + 277 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 264, + 311, + 277 + ], + "score": 1.0, + "content": ". The weight matrix", + "type": "text" + }, + { + "bbox": [ + 312, + 265, + 323, + 275 + ], + "score": 0.78, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 324, + 264, + 385, + 277 + ], + "score": 1.0, + "content": "is perturbed to", + "type": "text" + }, + { + "bbox": [ + 385, + 263, + 397, + 275 + ], + "score": 0.86, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 264, + 425, + 277 + ], + "score": 1.0, + "content": "where", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 13.5 + }, + { + "type": "interline_equation", + "bbox": [ + 272, + 282, + 338, + 298 + ], + "lines": [ + { + "bbox": [ + 272, + 282, + 338, + 298 + ], + "spans": [ + { + "bbox": [ + 272, + 282, + 338, + 298 + ], + "score": 0.91, + "content": "\\widetilde { W } = W + \\rho E .", + "type": "interline_equation", + "image_path": "2171ebfd99cb55e9d53c11cbacc557567aa53f4a0b68aaa1386080862c7d0dad.jpg" + } + ] + } + ], + "index": 15, + "virtual_lines": [ + { + "bbox": [ + 272, + 282, + 338, + 298 + ], + "spans": [], + "index": 15 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 305, + 505, + 339 + ], + "lines": [ + { + "bbox": [ + 104, + 303, + 506, + 318 + ], + "spans": [ + { + "bbox": [ + 104, + 303, + 128, + 318 + ], + "score": 1.0, + "content": "Here", + "type": "text" + }, + { + "bbox": [ + 129, + 304, + 173, + 316 + ], + "score": 0.93, + "content": "E \\in \\mathbb { R } ^ { k \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 303, + 481, + 318 + ], + "score": 1.0, + "content": "is a random matrix whose entries are i.i.d. standard Gaussians. We will use", + "type": "text" + }, + { + "bbox": [ + 482, + 304, + 493, + 316 + ], + "score": 0.87, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 303, + 506, + 318 + ], + "score": 1.0, + "content": "to", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 316, + 506, + 329 + ], + "spans": [ + { + "bbox": [ + 106, + 316, + 382, + 329 + ], + "score": 1.0, + "content": "denote the perturbed version of the augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 382, + 317, + 393, + 326 + ], + "score": 0.82, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 316, + 506, + 329 + ], + "score": 1.0, + "content": ". Recall that the columns of", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 327, + 175, + 342 + ], + "spans": [ + { + "bbox": [ + 107, + 327, + 118, + 340 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 119, + 327, + 175, + 342 + ], + "score": 1.0, + "content": "has the form:", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17 + }, + { + "type": "interline_equation", + "bbox": [ + 200, + 337, + 410, + 354 + ], + "lines": [ + { + "bbox": [ + 200, + 337, + 410, + 354 + ], + "spans": [ + { + "bbox": [ + 200, + 337, + 410, + 354 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j } = \\mathbb { E } \\big [ ( \\widetilde { w } _ { i } ^ { \\top } x ) ( \\widetilde { w } _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ \\widetilde { w } _ { i } ^ { \\top } x \\widetilde { w } _ { j } ^ { \\top } x \\leq 0 \\} \\big ] ,", + "type": "interline_equation", + "image_path": "01606f0eb491c419bfa9676bdcd6c9c22c77e28b8058d2ed23f105047c56c516.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 200, + 337, + 410, + 354 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 357, + 505, + 396 + ], + "lines": [ + { + "bbox": [ + 106, + 357, + 506, + 372 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 133, + 372 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 358, + 148, + 371 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 357, + 174, + 372 + ], + "score": 1.0, + "content": "is the", + "type": "text" + }, + { + "bbox": [ + 174, + 360, + 178, + 369 + ], + "score": 0.76, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 357, + 219, + 372 + ], + "score": 1.0, + "content": "-th row of", + "type": "text" + }, + { + "bbox": [ + 220, + 357, + 232, + 370 + ], + "score": 0.86, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 357, + 283, + 372 + ], + "score": 1.0, + "content": ". Also, since", + "type": "text" + }, + { + "bbox": [ + 283, + 357, + 295, + 369 + ], + "score": 0.87, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 357, + 506, + 372 + ], + "score": 1.0, + "content": "is the augmented distinguishing matrix it has a final", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 371, + 505, + 385 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 139, + 385 + ], + "score": 1.0, + "content": "column", + "type": "text" + }, + { + "bbox": [ + 139, + 371, + 198, + 385 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { 0 } = \\mathrm { v e c } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 371, + 380, + 385 + ], + "score": 1.0, + "content": ". We show that the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 380, + 371, + 392, + 383 + ], + "score": 0.9, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 371, + 505, + 385 + ], + "score": 1.0, + "content": "is lower bounded with high", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 383, + 156, + 398 + ], + "spans": [ + { + "bbox": [ + 105, + 383, + 156, + 398 + ], + "score": 1.0, + "content": "probability.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 106, + 398, + 505, + 448 + ], + "lines": [ + { + "bbox": [ + 106, + 398, + 505, + 412 + ], + "spans": [ + { + "bbox": [ + 106, + 398, + 213, + 412 + ], + "score": 1.0, + "content": "Theorem 9. Suppose that", + "type": "text" + }, + { + "bbox": [ + 213, + 399, + 248, + 411 + ], + "score": 0.92, + "content": "k \\leq d / 5", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 398, + 464, + 412 + ], + "score": 1.0, + "content": ", and the input follows standard Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 465, + 399, + 501, + 411 + ], + "score": 0.92, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 398, + 505, + 412 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 410, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 106, + 412, + 212, + 426 + ], + "score": 1.0, + "content": "Given any weight matrix", + "type": "text" + }, + { + "bbox": [ + 212, + 412, + 224, + 423 + ], + "score": 0.7, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 412, + 247, + 426 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 248, + 412, + 292, + 424 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 412, + 394, + 426 + ], + "score": 1.0, + "content": "for each row vector, let", + "type": "text" + }, + { + "bbox": [ + 394, + 410, + 407, + 423 + ], + "score": 0.82, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 412, + 506, + 426 + ], + "score": 1.0, + "content": "be a perturbed version", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 424, + 505, + 438 + ], + "spans": [ + { + "bbox": [ + 106, + 426, + 117, + 438 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 426, + 129, + 436 + ], + "score": 0.55, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 130, + 426, + 261, + 438 + ], + "score": 1.0, + "content": "according to Equation (18) and", + "type": "text" + }, + { + "bbox": [ + 262, + 424, + 274, + 436 + ], + "score": 0.8, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 274, + 426, + 505, + 438 + ], + "score": 1.0, + "content": "be the perturbed augmented distinguishing matrix. With", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 103, + 435, + 295, + 450 + ], + "spans": [ + { + "bbox": [ + 103, + 435, + 185, + 450 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 185, + 436, + 254, + 449 + ], + "score": 0.92, + "content": "\\therefore { \\exp ( - d ^ { \\Omega ( 1 ) } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 435, + 295, + 450 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5 + }, + { + "type": "interline_equation", + "bbox": [ + 243, + 453, + 367, + 470 + ], + "lines": [ + { + "bbox": [ + 243, + 453, + 367, + 470 + ], + "spans": [ + { + "bbox": [ + 243, + 453, + 367, + 470 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { M } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "2e2741df2a86a6f0dbd057543eb85209d651e6d69b0ad6df851c156f3f825185.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 243, + 453, + 367, + 470 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 481, + 281, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 481, + 281, + 494 + ], + "spans": [ + { + "bbox": [ + 106, + 481, + 281, + 494 + ], + "score": 1.0, + "content": "We will prove this Theorem in Section C.1.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 106, + 504, + 505, + 560 + ], + "lines": [ + { + "bbox": [ + 105, + 504, + 505, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 504, + 505, + 518 + ], + "score": 1.0, + "content": "Perturbing the Input Distribution Our algorithm works for a general symmetric input distribu-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 516, + 504, + 528 + ], + "spans": [ + { + "bbox": [ + 106, + 516, + 125, + 528 + ], + "score": 1.0, + "content": "tion", + "type": "text" + }, + { + "bbox": [ + 125, + 516, + 134, + 526 + ], + "score": 0.77, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 516, + 504, + 528 + ], + "score": 1.0, + "content": ". However, we cannot hope to get a result like Theorem 9 for every symmetric input distri-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 525, + 505, + 540 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 134, + 540 + ], + "score": 1.0, + "content": "bution", + "type": "text" + }, + { + "bbox": [ + 135, + 527, + 144, + 537 + ], + "score": 0.75, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 525, + 247, + 540 + ], + "score": 1.0, + "content": ". As a simple example, if", + "type": "text" + }, + { + "bbox": [ + 247, + 527, + 256, + 537 + ], + "score": 0.84, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 525, + 505, + 540 + ], + "score": 1.0, + "content": "is just concentrated on 0, then we do not get any information", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 538, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 105, + 538, + 505, + 551 + ], + "score": 1.0, + "content": "about weights and the problem is highly degenerate. Therefore, we must specify a way to perturb", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 548, + 194, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 548, + 194, + 561 + ], + "score": 1.0, + "content": "the input distribution.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31 + }, + { + "type": "text", + "bbox": [ + 106, + 565, + 505, + 644 + ], + "lines": [ + { + "bbox": [ + 105, + 564, + 506, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 424, + 579 + ], + "score": 1.0, + "content": "We define a perturbation that is parametrized by a random Gaussian matrix", + "type": "text" + }, + { + "bbox": [ + 424, + 566, + 434, + 577 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 564, + 506, + 579 + ], + "score": 1.0, + "content": "and a parameter", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 577, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 106, + 577, + 150, + 588 + ], + "score": 0.92, + "content": "\\lambda \\in ( 0 , 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 577, + 239, + 589 + ], + "score": 1.0, + "content": ". 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There is no standard way of", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 216, + 506, + 228 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 371, + 228 + ], + "score": 1.0, + "content": "perturbing a symmetric distribution, we give a simple perturbation", + "type": "text" + }, + { + "bbox": [ + 372, + 216, + 383, + 226 + ], + "score": 0.87, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 216, + 506, + 228 + ], + "score": 1.0, + "content": "that can be arbitrarily close to", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 227, + 299, + 240 + ], + "spans": [ + { + "bbox": [ + 106, + 228, + 115, + 238 + ], + "score": 0.76, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 227, + 178, + 240 + ], + "score": 1.0, + "content": ", and prove that", + "type": "text" + }, + { + "bbox": [ + 179, + 227, + 227, + 240 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 227, + 299, + 240 + ], + "score": 1.0, + "content": "is lowerbounded.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 6.5, + "bbox_fs": [ + 104, + 106, + 506, + 240 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 251, + 504, + 277 + ], + "lines": [ + { + "bbox": [ + 106, + 251, + 505, + 264 + ], + "spans": [ + { + "bbox": [ + 106, + 251, + 156, + 264 + ], + "score": 1.0, + "content": "Perturbing", + "type": "text" + }, + { + "bbox": [ + 157, + 252, + 169, + 263 + ], + "score": 0.6, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 169, + 251, + 505, + 264 + ], + "score": 1.0, + "content": "for Gaussian Input We first consider the case when the input follows standard", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 263, + 425, + 277 + ], + "spans": [ + { + "bbox": [ + 105, + 264, + 194, + 277 + ], + "score": 1.0, + "content": "Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 194, + 264, + 231, + 277 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 264, + 311, + 277 + ], + "score": 1.0, + "content": ". 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We will use", + "type": "text" + }, + { + "bbox": [ + 482, + 304, + 493, + 316 + ], + "score": 0.87, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 303, + 506, + 318 + ], + "score": 1.0, + "content": "to", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 316, + 506, + 329 + ], + "spans": [ + { + "bbox": [ + 106, + 316, + 382, + 329 + ], + "score": 1.0, + "content": "denote the perturbed version of the augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 382, + 317, + 393, + 326 + ], + "score": 0.82, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 316, + 506, + 329 + ], + "score": 1.0, + "content": ". Recall that the columns of", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 327, + 175, + 342 + ], + "spans": [ + { + "bbox": [ + 107, + 327, + 118, + 340 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 119, + 327, + 175, + 342 + ], + "score": 1.0, + "content": "has the form:", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17, + "bbox_fs": [ + 104, + 303, + 506, + 342 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 200, + 337, + 410, + 354 + ], + "lines": [ + { + "bbox": [ + 200, + 337, + 410, + 354 + ], + "spans": [ + { + "bbox": [ + 200, + 337, + 410, + 354 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j } = \\mathbb { E } \\big [ ( \\widetilde { w } _ { i } ^ { \\top } x ) ( \\widetilde { w } _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ \\widetilde { w } _ { i } ^ { \\top } x \\widetilde { w } _ { j } ^ { \\top } x \\leq 0 \\} \\big ] ,", + "type": "interline_equation", + "image_path": "01606f0eb491c419bfa9676bdcd6c9c22c77e28b8058d2ed23f105047c56c516.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 200, + 337, + 410, + 354 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 357, + 505, + 396 + ], + "lines": [ + { + "bbox": [ + 106, + 357, + 506, + 372 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 133, + 372 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 358, + 148, + 371 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 357, + 174, + 372 + ], + "score": 1.0, + "content": "is the", + "type": "text" + }, + { + "bbox": [ + 174, + 360, + 178, + 369 + ], + "score": 0.76, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 357, + 219, + 372 + ], + "score": 1.0, + "content": "-th row of", + "type": "text" + }, + { + "bbox": [ + 220, + 357, + 232, + 370 + ], + "score": 0.86, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 357, + 283, + 372 + ], + "score": 1.0, + "content": ". Also, since", + "type": "text" + }, + { + "bbox": [ + 283, + 357, + 295, + 369 + ], + "score": 0.87, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 357, + 506, + 372 + ], + "score": 1.0, + "content": "is the augmented distinguishing matrix it has a final", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 371, + 505, + 385 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 139, + 385 + ], + "score": 1.0, + "content": "column", + "type": "text" + }, + { + "bbox": [ + 139, + 371, + 198, + 385 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { 0 } = \\mathrm { v e c } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 371, + 380, + 385 + ], + "score": 1.0, + "content": ". We show that the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 380, + 371, + 392, + 383 + ], + "score": 0.9, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 371, + 505, + 385 + ], + "score": 1.0, + "content": "is lower bounded with high", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 383, + 156, + 398 + ], + "spans": [ + { + "bbox": [ + 105, + 383, + 156, + 398 + ], + "score": 1.0, + "content": "probability.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 357, + 506, + 398 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 398, + 505, + 448 + ], + "lines": [ + { + "bbox": [ + 106, + 398, + 505, + 412 + ], + "spans": [ + { + "bbox": [ + 106, + 398, + 213, + 412 + ], + "score": 1.0, + "content": "Theorem 9. Suppose that", + "type": "text" + }, + { + "bbox": [ + 213, + 399, + 248, + 411 + ], + "score": 0.92, + "content": "k \\leq d / 5", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 398, + 464, + 412 + ], + "score": 1.0, + "content": ", and the input follows standard Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 465, + 399, + 501, + 411 + ], + "score": 0.92, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 398, + 505, + 412 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 410, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 106, + 412, + 212, + 426 + ], + "score": 1.0, + "content": "Given any weight matrix", + "type": "text" + }, + { + "bbox": [ + 212, + 412, + 224, + 423 + ], + "score": 0.7, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 412, + 247, + 426 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 248, + 412, + 292, + 424 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 412, + 394, + 426 + ], + "score": 1.0, + "content": "for each row vector, let", + "type": "text" + }, + { + "bbox": [ + 394, + 410, + 407, + 423 + ], + "score": 0.82, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 412, + 506, + 426 + ], + "score": 1.0, + "content": "be a perturbed version", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 424, + 505, + 438 + ], + "spans": [ + { + "bbox": [ + 106, + 426, + 117, + 438 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 426, + 129, + 436 + ], + "score": 0.55, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 130, + 426, + 261, + 438 + ], + "score": 1.0, + "content": "according to Equation (18) and", + "type": "text" + }, + { + "bbox": [ + 262, + 424, + 274, + 436 + ], + "score": 0.8, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 274, + 426, + 505, + 438 + ], + "score": 1.0, + "content": "be the perturbed augmented distinguishing matrix. With", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 103, + 435, + 295, + 450 + ], + "spans": [ + { + "bbox": [ + 103, + 435, + 185, + 450 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 185, + 436, + 254, + 449 + ], + "score": 0.92, + "content": "\\therefore { \\exp ( - d ^ { \\Omega ( 1 ) } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 435, + 295, + 450 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5, + "bbox_fs": [ + 103, + 398, + 506, + 450 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 243, + 453, + 367, + 470 + ], + "lines": [ + { + "bbox": [ + 243, + 453, + 367, + 470 + ], + "spans": [ + { + "bbox": [ + 243, + 453, + 367, + 470 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { M } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "2e2741df2a86a6f0dbd057543eb85209d651e6d69b0ad6df851c156f3f825185.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 243, + 453, + 367, + 470 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 481, + 281, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 481, + 281, + 494 + ], + "spans": [ + { + "bbox": [ + 106, + 481, + 281, + 494 + ], + "score": 1.0, + "content": "We will prove this Theorem in Section C.1.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28, + "bbox_fs": [ + 106, + 481, + 281, + 494 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 504, + 505, + 560 + ], + "lines": [ + { + "bbox": [ + 105, + 504, + 505, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 504, + 505, + 518 + ], + "score": 1.0, + "content": "Perturbing the Input Distribution Our algorithm works for a general symmetric input distribu-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 516, + 504, + 528 + ], + "spans": [ + { + "bbox": [ + 106, + 516, + 125, + 528 + ], + "score": 1.0, + "content": "tion", + "type": "text" + }, + { + "bbox": [ + 125, + 516, + 134, + 526 + ], + "score": 0.77, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 516, + 504, + 528 + ], + "score": 1.0, + "content": ". However, we cannot hope to get a result like Theorem 9 for every symmetric input distri-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 525, + 505, + 540 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 134, + 540 + ], + "score": 1.0, + "content": "bution", + "type": "text" + }, + { + "bbox": [ + 135, + 527, + 144, + 537 + ], + "score": 0.75, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 525, + 247, + 540 + ], + "score": 1.0, + "content": ". As a simple example, if", + "type": "text" + }, + { + "bbox": [ + 247, + 527, + 256, + 537 + ], + "score": 0.84, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 525, + 505, + 540 + ], + "score": 1.0, + "content": "is just concentrated on 0, then we do not get any information", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 538, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 105, + 538, + 505, + 551 + ], + "score": 1.0, + "content": "about weights and the problem is highly degenerate. Therefore, we must specify a way to perturb", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 548, + 194, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 548, + 194, + 561 + ], + "score": 1.0, + "content": "the input distribution.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31, + "bbox_fs": [ + 105, + 504, + 505, + 561 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 565, + 505, + 644 + ], + "lines": [ + { + "bbox": [ + 105, + 564, + 506, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 424, + 579 + ], + "score": 1.0, + "content": "We define a perturbation that is parametrized by a random Gaussian matrix", + "type": "text" + }, + { + "bbox": [ + 424, + 566, + 434, + 577 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 564, + 506, + 579 + ], + "score": 1.0, + "content": "and a parameter", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 577, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 106, + 577, + 150, + 588 + ], + "score": 0.92, + "content": "\\lambda \\in ( 0 , 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 577, + 239, + 589 + ], + "score": 1.0, + "content": ". The random matrix", + "type": "text" + }, + { + "bbox": [ + 239, + 577, + 248, + 588 + ], + "score": 0.86, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 577, + 425, + 589 + ], + "score": 1.0, + "content": "is used to generate a Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 426, + 577, + 441, + 589 + ], + "score": 0.88, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 577, + 505, + 589 + ], + "score": 1.0, + "content": "with a random", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 587, + 504, + 600 + ], + "spans": [ + { + "bbox": [ + 105, + 587, + 279, + 600 + ], + "score": 1.0, + "content": "covariance matrix. 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Suppose that", + "type": "text" + }, + { + "bbox": [ + 226, + 170, + 264, + 181 + ], + "score": 0.91, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 169, + 284, + 182 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 284, + 170, + 344, + 181 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( W ) \\geq \\rho ,", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 169, + 408, + 182 + ], + "score": 1.0, + "content": ", after applying", + "type": "text" + }, + { + "bbox": [ + 409, + 170, + 435, + 182 + ], + "score": 0.92, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 169, + 506, + 182 + ], + "score": 1.0, + "content": "-perturbations to", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 180, + 505, + 193 + ], + "spans": [ + { + "bbox": [ + 104, + 180, + 242, + 193 + ], + "score": 1.0, + "content": "yield perturbed input distribution", + "type": "text" + }, + { + "bbox": [ + 242, + 181, + 253, + 190 + ], + "score": 0.84, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 180, + 284, + 193 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 284, + 181, + 293, + 191 + ], + "score": 0.79, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 180, + 311, + 193 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 312, + 181, + 335, + 191 + ], + "score": 0.87, + "content": "d \\times d", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 180, + 505, + 193 + ], + "score": 1.0, + "content": "matrix whose entries are i.i.d. Gaussians,", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 104, + 189, + 420, + 205 + ], + "spans": [ + { + "bbox": [ + 104, + 189, + 239, + 205 + ], + "score": 1.0, + "content": "we have with probability at least", + "type": "text" + }, + { + "bbox": [ + 239, + 191, + 308, + 204 + ], + "score": 0.89, + "content": "1 - \\exp ( - d ^ { \\Omega ( 1 ) } )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 189, + 406, + 205 + ], + "score": 1.0, + "content": "over the randomness of", + "type": "text" + }, + { + "bbox": [ + 407, + 192, + 415, + 203 + ], + "score": 0.83, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 189, + 420, + 205 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6.5 + }, + { + "type": "interline_equation", + "bbox": [ + 232, + 207, + 378, + 223 + ], + "lines": [ + { + "bbox": [ + 232, + 207, + 378, + 223 + ], + "spans": [ + { + "bbox": [ + 232, + 207, + 378, + 223 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho , \\lambda ) .", + "type": "interline_equation", + "image_path": "f0c82721eb234b4f23628abe752e025b695a95ea7bdab0b62142afe1a9b4010b.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 232, + 207, + 378, + 223 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 231, + 263, + 244 + ], + "lines": [ + { + "bbox": [ + 106, + 231, + 263, + 244 + ], + "spans": [ + { + "bbox": [ + 106, + 231, + 263, + 244 + ], + "score": 1.0, + "content": "We will prove this later in Section C.3.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "title", + "bbox": [ + 106, + 256, + 331, + 268 + ], + "lines": [ + { + "bbox": [ + 106, + 256, + 331, + 269 + ], + "spans": [ + { + "bbox": [ + 106, + 256, + 331, + 269 + ], + "score": 1.0, + "content": "C.1 SMOOTHED ANALYSIS FOR GAUSSIAN INPUTS", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 277, + 346, + 289 + ], + "lines": [ + { + "bbox": [ + 106, + 277, + 347, + 290 + ], + "spans": [ + { + "bbox": [ + 106, + 277, + 347, + 290 + ], + "score": 1.0, + "content": "In this section, we will prove Theorem 9, as restated below:", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 291, + 506, + 341 + ], + "lines": [ + { + "bbox": [ + 105, + 290, + 505, + 305 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 213, + 305 + ], + "score": 1.0, + "content": "Theorem 9. Suppose that", + "type": "text" + }, + { + "bbox": [ + 213, + 291, + 248, + 304 + ], + "score": 0.91, + "content": "k \\leq d / 5", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 290, + 464, + 305 + ], + "score": 1.0, + "content": ", and the input follows standard Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 465, + 293, + 501, + 304 + ], + "score": 0.89, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 290, + 505, + 305 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 303, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 106, + 304, + 212, + 318 + ], + "score": 1.0, + "content": "Given any weight matrix", + "type": "text" + }, + { + "bbox": [ + 212, + 305, + 224, + 315 + ], + "score": 0.61, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 304, + 247, + 318 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 248, + 304, + 292, + 317 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 304, + 394, + 318 + ], + "score": 1.0, + "content": "for each row vector, let", + "type": "text" + }, + { + "bbox": [ + 394, + 303, + 407, + 315 + ], + "score": 0.82, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 304, + 505, + 318 + ], + "score": 1.0, + "content": "be a perturbed version", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 317, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 106, + 318, + 117, + 331 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 318, + 129, + 329 + ], + "score": 0.47, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 130, + 318, + 262, + 331 + ], + "score": 1.0, + "content": "according to Equation (18) and", + "type": "text" + }, + { + "bbox": [ + 262, + 317, + 274, + 328 + ], + "score": 0.78, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 274, + 318, + 505, + 331 + ], + "score": 1.0, + "content": "be the perturbed augmented distinguishing matrix. With", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 328, + 295, + 343 + ], + "spans": [ + { + "bbox": [ + 104, + 328, + 185, + 343 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 185, + 329, + 254, + 342 + ], + "score": 0.92, + "content": "\\bar { 1 - \\exp ( - d ^ { \\Omega ( 1 ) } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 328, + 295, + 343 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 14.5 + }, + { + "type": "interline_equation", + "bbox": [ + 243, + 344, + 368, + 361 + ], + "lines": [ + { + "bbox": [ + 243, + 344, + 368, + 361 + ], + "spans": [ + { + "bbox": [ + 243, + 344, + 368, + 361 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { M } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "07cbd3812a1d0644aad90b545fcb35169e2db05b60016629d710a18ae285badd.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 243, + 344, + 368, + 361 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 370, + 310, + 382 + ], + "lines": [ + { + "bbox": [ + 106, + 367, + 311, + 384 + ], + "spans": [ + { + "bbox": [ + 106, + 367, + 289, + 384 + ], + "score": 1.0, + "content": "To prove this theorem, recall the definition of", + "type": "text" + }, + { + "bbox": [ + 290, + 371, + 307, + 383 + ], + "score": 0.91, + "content": "M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 367, + 311, + 384 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "interline_equation", + "bbox": [ + 191, + 385, + 419, + 402 + ], + "lines": [ + { + "bbox": [ + 191, + 385, + 419, + 402 + ], + "spans": [ + { + "bbox": [ + 191, + 385, + 419, + 402 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\mathrm { m a t } ( M _ { i j } ) = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x x ^ { \\top } ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "c43cabe4a563e1558edff76a592a2620614c5f50f94ffdfe9d921b7d5ec73b1d.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 191, + 385, + 419, + 402 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 410, + 503, + 433 + ], + "lines": [ + { + "bbox": [ + 105, + 408, + 504, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 380, + 424 + ], + "score": 1.0, + "content": "Since Gaussian distribution is highly symmetric, for every direction", + "type": "text" + }, + { + "bbox": [ + 380, + 412, + 387, + 420 + ], + "score": 0.79, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 408, + 492, + 424 + ], + "score": 1.0, + "content": "that is orthogonal to both", + "type": "text" + }, + { + "bbox": [ + 492, + 412, + 504, + 421 + ], + "score": 0.81, + "content": "w _ { i }", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 421, + 425, + 434 + ], + "spans": [ + { + "bbox": [ + 105, + 421, + 123, + 434 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 423, + 136, + 434 + ], + "score": 0.87, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 421, + 175, + 434 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 175, + 421, + 234, + 434 + ], + "score": 0.94, + "content": "u ^ { \\top } \\operatorname* { m a t } ( M _ { i j } ) u", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 421, + 425, + 434 + ], + "score": 1.0, + "content": "be a constant. We can compute this constant as", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20.5 + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 436, + 395, + 453 + ], + "lines": [ + { + "bbox": [ + 215, + 436, + 395, + 453 + ], + "spans": [ + { + "bbox": [ + 215, + 436, + 395, + 453 + ], + "score": 0.92, + "content": "m _ { i j } : = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] .", + "type": "interline_equation", + "image_path": "c45a0947e5e174aa65606ed4e48e03a88b081e38edfc0929f77b60d93f324533.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 215, + 436, + 395, + 453 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 462, + 506, + 496 + ], + "lines": [ + { + "bbox": [ + 105, + 461, + 506, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 461, + 243, + 476 + ], + "score": 1.0, + "content": "This implies that if we consider", + "type": "text" + }, + { + "bbox": [ + 243, + 462, + 322, + 475 + ], + "score": 0.9, + "content": "\\mathrm { m a t } ( M _ { i j } ) - m _ { i j } I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 461, + 506, + 476 + ], + "score": 1.0, + "content": ", it is going to be a matrix whose rows and", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 472, + 506, + 487 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 203, + 487 + ], + "score": 1.0, + "content": "columns are in span of", + "type": "text" + }, + { + "bbox": [ + 203, + 475, + 214, + 484 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 472, + 234, + 487 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 234, + 475, + 246, + 486 + ], + "score": 0.87, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 472, + 506, + 487 + ], + "score": 1.0, + "content": ". In fact we can compute the matrix explicitly as the following", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 484, + 139, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 139, + 497 + ], + "score": 1.0, + "content": "lemma:", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 104, + 498, + 505, + 522 + ], + "lines": [ + { + "bbox": [ + 105, + 497, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 217, + 513 + ], + "score": 1.0, + "content": "Lemma 19. Suppose input", + "type": "text" + }, + { + "bbox": [ + 218, + 501, + 225, + 509 + ], + "score": 0.67, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 497, + 383, + 513 + ], + "score": 1.0, + "content": "follows standard Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 384, + 498, + 420, + 511 + ], + "score": 0.94, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 497, + 505, + 513 + ], + "score": 1.0, + "content": ", and suppose weight", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 509, + 371, + 522 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 135, + 522 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 135, + 510, + 147, + 520 + ], + "score": 0.41, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 509, + 273, + 522 + ], + "score": 1.0, + "content": "has full-row rank, then for any", + "type": "text" + }, + { + "bbox": [ + 273, + 510, + 332, + 522 + ], + "score": 0.93, + "content": "1 \\leq i < j \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 332, + 509, + 371, + 522 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26.5 + }, + { + "type": "interline_equation", + "bbox": [ + 149, + 524, + 462, + 578 + ], + "lines": [ + { + "bbox": [ + 149, + 524, + 462, + 578 + ], + "spans": [ + { + "bbox": [ + 149, + 524, + 462, + 578 + ], + "score": 0.93, + "content": "\\begin{array} { l } { { m a t } ( M _ { i j } ) = \\displaystyle \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) \\big ) \\| w _ { i } \\| \\| w _ { j } \\| I _ { d } + \\displaystyle \\frac { \\phi _ { i j } } { \\pi } \\big ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } \\big ) } \\\\ { \\displaystyle ~ - \\frac { \\sin \\left( \\phi _ { i j } \\right) } { \\pi } ( \\frac { \\| w _ { i } \\| } { \\| w _ { j } \\| } w _ { j } w _ { j } ^ { \\top } + \\frac { \\| w _ { j } \\| } { \\| w _ { i } \\| } w _ { i } w _ { i } ^ { \\top } ) , } \\end{array}", + "type": "interline_equation", + "image_path": "f2f08af2b50d6207e43d594044b4538d4018c475fb440ceab55e4dc86bb38788.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 149, + 524, + 462, + 542.0 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 149, + 542.0, + 462, + 560.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 149, + 560.0, + 462, + 578.0 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 579, + 375, + 591 + ], + "lines": [ + { + "bbox": [ + 105, + 576, + 372, + 594 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 133, + 594 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 579, + 185, + 591 + ], + "score": 0.92, + "content": "0 < \\phi _ { i j } < \\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 576, + 330, + 594 + ], + "score": 1.0, + "content": "is the angle between weight vectors", + "type": "text" + }, + { + "bbox": [ + 330, + 582, + 341, + 590 + ], + "score": 0.84, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 342, + 576, + 360, + 594 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 360, + 581, + 372, + 592 + ], + "score": 0.85, + "content": "w _ { j }", + "type": "inline_equation" + } + ], + "index": 31 + } + ], + "index": 31 + }, + { + "type": "text", + "bbox": [ + 107, + 600, + 505, + 636 + ], + "lines": [ + { + "bbox": [ + 106, + 600, + 505, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 601, + 311, + 614 + ], + "score": 1.0, + "content": "Of course, the same lemma would be applicable to", + "type": "text" + }, + { + "bbox": [ + 312, + 600, + 324, + 613 + ], + "score": 0.86, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 324, + 601, + 467, + 614 + ], + "score": 1.0, + "content": ", so we have an explicit formula for", + "type": "text" + }, + { + "bbox": [ + 467, + 600, + 484, + 615 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 601, + 505, + 614 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 613, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 106, + 613, + 505, + 626 + ], + "score": 1.0, + "content": "will bound the smallest singular value using the idea of leave-one-out distance (as previously used", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 624, + 245, + 637 + ], + "spans": [ + { + "bbox": [ + 106, + 624, + 245, + 637 + ], + "score": 1.0, + "content": "in Rudelson & Vershynin (2009)).", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 106, + 647, + 504, + 670 + ], + "lines": [ + { + "bbox": [ + 106, + 648, + 504, + 659 + ], + "spans": [ + { + "bbox": [ + 106, + 648, + 504, + 659 + ], + "score": 1.0, + "content": "Leave-one-out Distance Leave-one-out distance is a metric that is closely related to the smallest", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 658, + 302, + 671 + ], + "spans": [ + { + "bbox": [ + 105, + 658, + 302, + 671 + ], + "score": 1.0, + "content": "singular value but often much easier to estimate.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35.5 + }, + { + "type": "text", + "bbox": [ + 106, + 672, + 505, + 707 + ], + "lines": [ + { + "bbox": [ + 104, + 670, + 506, + 686 + ], + "spans": [ + { + "bbox": [ + 104, + 670, + 216, + 686 + ], + "score": 1.0, + "content": "Definition 2. For a matrix", + "type": "text" + }, + { + "bbox": [ + 217, + 672, + 292, + 685 + ], + "score": 0.91, + "content": "A \\in \\mathbb { R } ^ { d \\times n } ( d \\geq n )", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 670, + 405, + 686 + ], + "score": 1.0, + "content": ", the leave-one-out distance", + "type": "text" + }, + { + "bbox": [ + 405, + 673, + 426, + 685 + ], + "score": 0.91, + "content": "d ( A )", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 670, + 506, + 686 + ], + "score": 1.0, + "content": "is defined to be the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 684, + 505, + 696 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 261, + 696 + ], + "score": 1.0, + "content": "smallest distance between a column of", + "type": "text" + }, + { + "bbox": [ + 262, + 685, + 270, + 694 + ], + "score": 0.76, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 271, + 684, + 465, + 696 + ], + "score": 1.0, + "content": "to the span of other columns. 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Recall that", + "type": "text" + }, + { + "bbox": [ + 192, + 106, + 213, + 118 + ], + "score": 0.91, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 106, + 267, + 120 + ], + "score": 1.0, + "content": "is defined as", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1, + "bbox_fs": [ + 105, + 82, + 506, + 120 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 188, + 121, + 421, + 138 + ], + "lines": [ + { + "bbox": [ + 188, + 121, + 421, + 138 + ], + "spans": [ + { + "bbox": [ + 188, + 121, + 421, + 138 + ], + "score": 0.89, + "content": "\\begin{array} { r } { M _ { i j } ^ { \\mathcal { D } ^ { \\prime } } = \\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } \\bigl [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\bigr ] , } \\end{array}", + "type": "interline_equation", + "image_path": "0c6dbfe0331c463476c956839f4c11a646b7a807639394c97083f5542f817208.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 188, + 121, + 421, + 138 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 142, + 369, + 156 + ], + "lines": [ + { + "bbox": [ + 105, + 141, + 370, + 157 + ], + "spans": [ + { + "bbox": [ + 105, + 141, + 151, + 157 + ], + "score": 1.0, + "content": "as the first", + "type": "text" + }, + { + "bbox": [ + 151, + 142, + 164, + 157 + ], + "score": 0.87, + "content": "\\binom { k } { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 164, + 141, + 235, + 157 + ], + "score": 1.0, + "content": "columns and has", + "type": "text" + }, + { + "bbox": [ + 235, + 143, + 292, + 155 + ], + "score": 0.93, + "content": "\\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } [ x \\otimes x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 141, + 370, + 157 + ], + "score": 1.0, + "content": "as the last column.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4, + "bbox_fs": [ + 105, + 141, + 370, + 157 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 158, + 506, + 204 + ], + "lines": [ + { + "bbox": [ + 105, + 157, + 506, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 157, + 253, + 172 + ], + "score": 1.0, + "content": "Theorem 10. Given weight matrix", + "type": "text" + }, + { + "bbox": [ + 254, + 158, + 266, + 169 + ], + "score": 0.73, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 157, + 288, + 172 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 289, + 158, + 333, + 170 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 157, + 506, + 172 + ], + "score": 1.0, + "content": "for each row vector and symmetric input", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 169, + 506, + 182 + ], + "spans": [ + { + "bbox": [ + 105, + 169, + 156, + 182 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 156, + 170, + 165, + 180 + ], + "score": 0.79, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 169, + 226, + 182 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + }, + { + "bbox": [ + 226, + 170, + 264, + 181 + ], + "score": 0.91, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 169, + 284, + 182 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 284, + 170, + 344, + 181 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( W ) \\geq \\rho ,", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 169, + 408, + 182 + ], + "score": 1.0, + "content": ", after applying", + "type": "text" + }, + { + "bbox": [ + 409, + 170, + 435, + 182 + ], + "score": 0.92, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 169, + 506, + 182 + ], + "score": 1.0, + "content": "-perturbations to", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 180, + 505, + 193 + ], + "spans": [ + { + "bbox": [ + 104, + 180, + 242, + 193 + ], + "score": 1.0, + "content": "yield perturbed input distribution", + "type": "text" + }, + { + "bbox": [ + 242, + 181, + 253, + 190 + ], + "score": 0.84, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 180, + 284, + 193 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 284, + 181, + 293, + 191 + ], + "score": 0.79, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 180, + 311, + 193 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 312, + 181, + 335, + 191 + ], + "score": 0.87, + "content": "d \\times d", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 180, + 505, + 193 + ], + "score": 1.0, + "content": "matrix whose entries are i.i.d. Gaussians,", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 104, + 189, + 420, + 205 + ], + "spans": [ + { + "bbox": [ + 104, + 189, + 239, + 205 + ], + "score": 1.0, + "content": "we have with probability at least", + "type": "text" + }, + { + "bbox": [ + 239, + 191, + 308, + 204 + ], + "score": 0.89, + "content": "1 - \\exp ( - d ^ { \\Omega ( 1 ) } )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 189, + 406, + 205 + ], + "score": 1.0, + "content": "over the randomness of", + "type": "text" + }, + { + "bbox": [ + 407, + 192, + 415, + 203 + ], + "score": 0.83, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 189, + 420, + 205 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6.5, + "bbox_fs": [ + 104, + 157, + 506, + 205 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 232, + 207, + 378, + 223 + ], + "lines": [ + { + "bbox": [ + 232, + 207, + 378, + 223 + ], + "spans": [ + { + "bbox": [ + 232, + 207, + 378, + 223 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho , \\lambda ) .", + "type": "interline_equation", + "image_path": "f0c82721eb234b4f23628abe752e025b695a95ea7bdab0b62142afe1a9b4010b.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 232, + 207, + 378, + 223 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 231, + 263, + 244 + ], + "lines": [ + { + "bbox": [ + 106, + 231, + 263, + 244 + ], + "spans": [ + { + "bbox": [ + 106, + 231, + 263, + 244 + ], + "score": 1.0, + "content": "We will prove this later in Section C.3.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10, + "bbox_fs": [ + 106, + 231, + 263, + 244 + ] + }, + { + "type": "title", + "bbox": [ + 106, + 256, + 331, + 268 + ], + "lines": [ + { + "bbox": [ + 106, + 256, + 331, + 269 + ], + "spans": [ + { + "bbox": [ + 106, + 256, + 331, + 269 + ], + "score": 1.0, + "content": "C.1 SMOOTHED ANALYSIS FOR GAUSSIAN INPUTS", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 277, + 346, + 289 + ], + "lines": [ + { + "bbox": [ + 106, + 277, + 347, + 290 + ], + "spans": [ + { + "bbox": [ + 106, + 277, + 347, + 290 + ], + "score": 1.0, + "content": "In this section, we will prove Theorem 9, as restated below:", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12, + "bbox_fs": [ + 106, + 277, + 347, + 290 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 291, + 506, + 341 + ], + "lines": [ + { + "bbox": [ + 105, + 290, + 505, + 305 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 213, + 305 + ], + "score": 1.0, + "content": "Theorem 9. Suppose that", + "type": "text" + }, + { + "bbox": [ + 213, + 291, + 248, + 304 + ], + "score": 0.91, + "content": "k \\leq d / 5", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 290, + 464, + 305 + ], + "score": 1.0, + "content": ", and the input follows standard Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 465, + 293, + 501, + 304 + ], + "score": 0.89, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 290, + 505, + 305 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 303, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 106, + 304, + 212, + 318 + ], + "score": 1.0, + "content": "Given any weight matrix", + "type": "text" + }, + { + "bbox": [ + 212, + 305, + 224, + 315 + ], + "score": 0.61, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 304, + 247, + 318 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 248, + 304, + 292, + 317 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 304, + 394, + 318 + ], + "score": 1.0, + "content": "for each row vector, let", + "type": "text" + }, + { + "bbox": [ + 394, + 303, + 407, + 315 + ], + "score": 0.82, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 304, + 505, + 318 + ], + "score": 1.0, + "content": "be a perturbed version", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 317, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 106, + 318, + 117, + 331 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 318, + 129, + 329 + ], + "score": 0.47, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 130, + 318, + 262, + 331 + ], + "score": 1.0, + "content": "according to Equation (18) and", + "type": "text" + }, + { + "bbox": [ + 262, + 317, + 274, + 328 + ], + "score": 0.78, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 274, + 318, + 505, + 331 + ], + "score": 1.0, + "content": "be the perturbed augmented distinguishing matrix. With", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 328, + 295, + 343 + ], + "spans": [ + { + "bbox": [ + 104, + 328, + 185, + 343 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 185, + 329, + 254, + 342 + ], + "score": 0.92, + "content": "\\bar { 1 - \\exp ( - d ^ { \\Omega ( 1 ) } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 328, + 295, + 343 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 14.5, + "bbox_fs": [ + 104, + 290, + 505, + 343 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 243, + 344, + 368, + 361 + ], + "lines": [ + { + "bbox": [ + 243, + 344, + 368, + 361 + ], + "spans": [ + { + "bbox": [ + 243, + 344, + 368, + 361 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { M } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "07cbd3812a1d0644aad90b545fcb35169e2db05b60016629d710a18ae285badd.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 243, + 344, + 368, + 361 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 370, + 310, + 382 + ], + "lines": [ + { + "bbox": [ + 106, + 367, + 311, + 384 + ], + "spans": [ + { + "bbox": [ + 106, + 367, + 289, + 384 + ], + "score": 1.0, + "content": "To prove this theorem, recall the definition of", + "type": "text" + }, + { + "bbox": [ + 290, + 371, + 307, + 383 + ], + "score": 0.91, + "content": "M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 367, + 311, + 384 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18, + "bbox_fs": [ + 106, + 367, + 311, + 384 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 191, + 385, + 419, + 402 + ], + "lines": [ + { + "bbox": [ + 191, + 385, + 419, + 402 + ], + "spans": [ + { + "bbox": [ + 191, + 385, + 419, + 402 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\mathrm { m a t } ( M _ { i j } ) = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x x ^ { \\top } ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] . } \\end{array}", + "type": "interline_equation", + "image_path": "c43cabe4a563e1558edff76a592a2620614c5f50f94ffdfe9d921b7d5ec73b1d.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 191, + 385, + 419, + 402 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 410, + 503, + 433 + ], + "lines": [ + { + "bbox": [ + 105, + 408, + 504, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 380, + 424 + ], + "score": 1.0, + "content": "Since Gaussian distribution is highly symmetric, for every direction", + "type": "text" + }, + { + "bbox": [ + 380, + 412, + 387, + 420 + ], + "score": 0.79, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 408, + 492, + 424 + ], + "score": 1.0, + "content": "that is orthogonal to both", + "type": "text" + }, + { + "bbox": [ + 492, + 412, + 504, + 421 + ], + "score": 0.81, + "content": "w _ { i }", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 421, + 425, + 434 + ], + "spans": [ + { + "bbox": [ + 105, + 421, + 123, + 434 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 423, + 136, + 434 + ], + "score": 0.87, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 421, + 175, + 434 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 175, + 421, + 234, + 434 + ], + "score": 0.94, + "content": "u ^ { \\top } \\operatorname* { m a t } ( M _ { i j } ) u", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 421, + 425, + 434 + ], + "score": 1.0, + "content": "be a constant. We can compute this constant as", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20.5, + "bbox_fs": [ + 105, + 408, + 504, + 434 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 436, + 395, + 453 + ], + "lines": [ + { + "bbox": [ + 215, + 436, + 395, + 453 + ], + "spans": [ + { + "bbox": [ + 215, + 436, + 395, + 453 + ], + "score": 0.92, + "content": "m _ { i j } : = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] .", + "type": "interline_equation", + "image_path": "c45a0947e5e174aa65606ed4e48e03a88b081e38edfc0929f77b60d93f324533.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 215, + 436, + 395, + 453 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 462, + 506, + 496 + ], + "lines": [ + { + "bbox": [ + 105, + 461, + 506, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 461, + 243, + 476 + ], + "score": 1.0, + "content": "This implies that if we consider", + "type": "text" + }, + { + "bbox": [ + 243, + 462, + 322, + 475 + ], + "score": 0.9, + "content": "\\mathrm { m a t } ( M _ { i j } ) - m _ { i j } I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 461, + 506, + 476 + ], + "score": 1.0, + "content": ", it is going to be a matrix whose rows and", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 472, + 506, + 487 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 203, + 487 + ], + "score": 1.0, + "content": "columns are in span of", + "type": "text" + }, + { + "bbox": [ + 203, + 475, + 214, + 484 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 472, + 234, + 487 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 234, + 475, + 246, + 486 + ], + "score": 0.87, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 472, + 506, + 487 + ], + "score": 1.0, + "content": ". In fact we can compute the matrix explicitly as the following", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 484, + 139, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 139, + 497 + ], + "score": 1.0, + "content": "lemma:", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24, + "bbox_fs": [ + 105, + 461, + 506, + 497 + ] + }, + { + "type": "text", + "bbox": [ + 104, + 498, + 505, + 522 + ], + "lines": [ + { + "bbox": [ + 105, + 497, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 217, + 513 + ], + "score": 1.0, + "content": "Lemma 19. Suppose input", + "type": "text" + }, + { + "bbox": [ + 218, + 501, + 225, + 509 + ], + "score": 0.67, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 497, + 383, + 513 + ], + "score": 1.0, + "content": "follows standard Gaussian distribution", + "type": "text" + }, + { + "bbox": [ + 384, + 498, + 420, + 511 + ], + "score": 0.94, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 497, + 505, + 513 + ], + "score": 1.0, + "content": ", and suppose weight", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 509, + 371, + 522 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 135, + 522 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 135, + 510, + 147, + 520 + ], + "score": 0.41, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 509, + 273, + 522 + ], + "score": 1.0, + "content": "has full-row rank, then for any", + "type": "text" + }, + { + "bbox": [ + 273, + 510, + 332, + 522 + ], + "score": 0.93, + "content": "1 \\leq i < j \\leq k", + "type": "inline_equation" + }, + { + "bbox": [ + 332, + 509, + 371, + 522 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 26.5, + "bbox_fs": [ + 105, + 497, + 505, + 522 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 149, + 524, + 462, + 578 + ], + "lines": [ + { + "bbox": [ + 149, + 524, + 462, + 578 + ], + "spans": [ + { + "bbox": [ + 149, + 524, + 462, + 578 + ], + "score": 0.93, + "content": "\\begin{array} { l } { { m a t } ( M _ { i j } ) = \\displaystyle \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) \\big ) \\| w _ { i } \\| \\| w _ { j } \\| I _ { d } + \\displaystyle \\frac { \\phi _ { i j } } { \\pi } \\big ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } \\big ) } \\\\ { \\displaystyle ~ - \\frac { \\sin \\left( \\phi _ { i j } \\right) } { \\pi } ( \\frac { \\| w _ { i } \\| } { \\| w _ { j } \\| } w _ { j } w _ { j } ^ { \\top } + \\frac { \\| w _ { j } \\| } { \\| w _ { i } \\| } w _ { i } w _ { i } ^ { \\top } ) , } \\end{array}", + "type": "interline_equation", + "image_path": "f2f08af2b50d6207e43d594044b4538d4018c475fb440ceab55e4dc86bb38788.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 149, + 524, + 462, + 542.0 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 149, + 542.0, + 462, + 560.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 149, + 560.0, + 462, + 578.0 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 579, + 375, + 591 + ], + "lines": [ + { + "bbox": [ + 105, + 576, + 372, + 594 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 133, + 594 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 579, + 185, + 591 + ], + "score": 0.92, + "content": "0 < \\phi _ { i j } < \\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 576, + 330, + 594 + ], + "score": 1.0, + "content": "is the angle between weight vectors", + "type": "text" + }, + { + "bbox": [ + 330, + 582, + 341, + 590 + ], + "score": 0.84, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 342, + 576, + 360, + 594 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 360, + 581, + 372, + 592 + ], + "score": 0.85, + "content": "w _ { j }", + "type": "inline_equation" + } + ], + "index": 31 + } + ], + "index": 31, + "bbox_fs": [ + 105, + 576, + 372, + 594 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 600, + 505, + 636 + ], + "lines": [ + { + "bbox": [ + 106, + 600, + 505, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 601, + 311, + 614 + ], + "score": 1.0, + "content": "Of course, the same lemma would be applicable to", + "type": "text" + }, + { + "bbox": [ + 312, + 600, + 324, + 613 + ], + "score": 0.86, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 324, + 601, + 467, + 614 + ], + "score": 1.0, + "content": ", so we have an explicit formula for", + "type": "text" + }, + { + "bbox": [ + 467, + 600, + 484, + 615 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 601, + 505, + 614 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 613, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 106, + 613, + 505, + 626 + ], + "score": 1.0, + "content": "will bound the smallest singular value using the idea of leave-one-out distance (as previously used", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 624, + 245, + 637 + ], + "spans": [ + { + "bbox": [ + 106, + 624, + 245, + 637 + ], + "score": 1.0, + "content": "in Rudelson & Vershynin (2009)).", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33, + "bbox_fs": [ + 106, + 600, + 505, + 637 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 647, + 504, + 670 + ], + "lines": [ + { + "bbox": [ + 106, + 648, + 504, + 659 + ], + "spans": [ + { + "bbox": [ + 106, + 648, + 504, + 659 + ], + "score": 1.0, + "content": "Leave-one-out Distance Leave-one-out distance is a metric that is closely related to the smallest", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 658, + 302, + 671 + ], + "spans": [ + { + "bbox": [ + 105, + 658, + 302, + 671 + ], + "score": 1.0, + "content": "singular value but often much easier to estimate.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35.5, + "bbox_fs": [ + 105, + 648, + 504, + 671 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 672, + 505, + 707 + ], + "lines": [ + { + "bbox": [ + 104, + 670, + 506, + 686 + ], + "spans": [ + { + "bbox": [ + 104, + 670, + 216, + 686 + ], + "score": 1.0, + "content": "Definition 2. For a matrix", + "type": "text" + }, + { + "bbox": [ + 217, + 672, + 292, + 685 + ], + "score": 0.91, + "content": "A \\in \\mathbb { R } ^ { d \\times n } ( d \\geq n )", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 670, + 405, + 686 + ], + "score": 1.0, + "content": ", the leave-one-out distance", + "type": "text" + }, + { + "bbox": [ + 405, + 673, + 426, + 685 + ], + "score": 0.91, + "content": "d ( A )", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 670, + 506, + 686 + ], + "score": 1.0, + "content": "is defined to be the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 684, + 505, + 696 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 261, + 696 + ], + "score": 1.0, + "content": "smallest distance between a column of", + "type": "text" + }, + { + "bbox": [ + 262, + 685, + 270, + 694 + ], + "score": 0.76, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 271, + 684, + 465, + 696 + ], + "score": 1.0, + "content": "to the span of other columns. More precisely, let", + "type": "text" + }, + { + "bbox": [ + 466, + 684, + 477, + 695 + ], + "score": 0.87, + "content": "A _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 478, + 684, + 505, + 696 + ], + "score": 1.0, + "content": "be the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 694, + 411, + 708 + ], + "spans": [ + { + "bbox": [ + 106, + 696, + 111, + 705 + ], + "score": 0.43, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 111, + 694, + 166, + 708 + ], + "score": 1.0, + "content": "-th column of", + "type": "text" + }, + { + "bbox": [ + 166, + 695, + 174, + 705 + ], + "score": 0.67, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 694, + 193, + 708 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 193, + 695, + 209, + 706 + ], + "score": 0.9, + "content": "S _ { - i }", + "type": "inline_equation" + }, + { + "bbox": [ + 210, + 694, + 374, + 708 + ], + "score": 1.0, + "content": "be the span of all the columns except for", + "type": "text" + }, + { + "bbox": [ + 375, + 695, + 386, + 706 + ], + "score": 0.88, + "content": "A _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 694, + 411, + 708 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 38, + "bbox_fs": [ + 104, + 670, + 506, + 708 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 710, + 375, + 730 + ], + "lines": [ + { + "bbox": [ + 235, + 710, + 375, + 730 + ], + "spans": [ + { + "bbox": [ + 235, + 710, + 375, + 730 + ], + "score": 0.93, + "content": "d ( A ) : = \\operatorname* { m i n } _ { i \\in [ n ] } \\| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \\| .", + "type": "interline_equation", + "image_path": "327e095d69a528059b87663149d8990016bc4e4005c4555a30a10674615a02b9.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 235, + 710, + 375, + 730 + ], + "spans": [], + "index": 40 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 506, + 96 + ], + "score": 1.0, + "content": "Rudelson & Vershynin (2009) showed that one can lowerbound the smallest singular value of a", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 254, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 254, + 106 + ], + "score": 1.0, + "content": "matrix by its leave-one-out distance.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 106, + 108, + 504, + 134 + ], + "lines": [ + { + "bbox": [ + 105, + 106, + 506, + 122 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 344, + 122 + ], + "score": 1.0, + "content": "Lemma 20 (Rudelson & Vershynin (2009)). For matrix", + "type": "text" + }, + { + "bbox": [ + 344, + 108, + 431, + 121 + ], + "score": 0.92, + "content": "A \\ \\in \\ \\mathbb { R } ^ { d \\times n } ( d \\ \\geq \\ n )", + "type": "inline_equation" + }, + { + "bbox": [ + 432, + 106, + 506, + 122 + ], + "score": 1.0, + "content": ", we always have", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 117, + 228, + 135 + ], + "spans": [ + { + "bbox": [ + 106, + 119, + 223, + 135 + ], + "score": 0.92, + "content": "\\begin{array} { r } { d ( A ) \\geq \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\frac { 1 } { \\sqrt { n } } d ( A ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 117, + 228, + 135 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5 + }, + { + "type": "text", + "bbox": [ + 106, + 144, + 505, + 207 + ], + "lines": [ + { + "bbox": [ + 106, + 144, + 505, + 159 + ], + "spans": [ + { + "bbox": [ + 106, + 145, + 193, + 159 + ], + "score": 1.0, + "content": "Therefore, to bound", + "type": "text" + }, + { + "bbox": [ + 193, + 144, + 232, + 159 + ], + "score": 0.94, + "content": "\\sigma _ { \\mathrm { m i n } } ( \\widetilde { M } )", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 145, + 354, + 159 + ], + "score": 1.0, + "content": "we just need to lowerbound", + "type": "text" + }, + { + "bbox": [ + 355, + 144, + 379, + 159 + ], + "score": 0.93, + "content": "d ( \\widetilde { M } )", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 145, + 505, + 159 + ], + "score": 1.0, + "content": ". We use the ideas similar to", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 157, + 505, + 172 + ], + "spans": [ + { + "bbox": [ + 106, + 159, + 380, + 172 + ], + "score": 1.0, + "content": "Bhaskara et al. (2014) and Ma et al. (2016). Since every column of", + "type": "text" + }, + { + "bbox": [ + 380, + 158, + 392, + 170 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 159, + 440, + 172 + ], + "score": 1.0, + "content": "(except for", + "type": "text" + }, + { + "bbox": [ + 440, + 157, + 456, + 171 + ], + "score": 0.86, + "content": "\\widetilde { M } _ { 0 } ^ { \\mathrm { ~ ~ } }", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 159, + 505, + 172 + ], + "score": 1.0, + "content": ") is random,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 171, + 504, + 182 + ], + "spans": [ + { + "bbox": [ + 106, + 171, + 504, + 182 + ], + "score": 1.0, + "content": "we will try to show that even if we condition on all the other columns, because of the randomness", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 181, + 506, + 198 + ], + "spans": [ + { + "bbox": [ + 105, + 182, + 117, + 198 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 182, + 135, + 196 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 182, + 225, + 198 + ], + "score": 1.0, + "content": ", the distance between", + "type": "text" + }, + { + "bbox": [ + 225, + 181, + 243, + 196 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 182, + 506, + 198 + ], + "score": 1.0, + "content": "to the span of other columns is large. However, there are several", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 195, + 214, + 207 + ], + "spans": [ + { + "bbox": [ + 106, + 195, + 214, + 207 + ], + "score": 1.0, + "content": "obstacles in this approach:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 129, + 217, + 505, + 304 + ], + "lines": [ + { + "bbox": [ + 129, + 217, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 129, + 217, + 294, + 233 + ], + "score": 1.0, + "content": "1. The augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 294, + 217, + 306, + 230 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 306, + 217, + 392, + 233 + ], + "score": 1.0, + "content": "has a special column", + "type": "text" + }, + { + "bbox": [ + 392, + 217, + 450, + 232 + ], + "score": 0.93, + "content": "{ \\widetilde { M } } _ { 0 } = \\operatorname { v e c } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 217, + 506, + 233 + ], + "score": 1.0, + "content": "that does not", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 141, + 230, + 233, + 243 + ], + "spans": [ + { + "bbox": [ + 141, + 230, + 233, + 243 + ], + "score": 1.0, + "content": "have any randomness.", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 128, + 246, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 128, + 246, + 270, + 261 + ], + "score": 1.0, + "content": "2. The closed form expression for", + "type": "text" + }, + { + "bbox": [ + 270, + 246, + 282, + 258 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 246, + 505, + 261 + ], + "score": 1.0, + "content": "(as in Lemma 19) has complicated coefficients that are", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 141, + 258, + 285, + 272 + ], + "spans": [ + { + "bbox": [ + 141, + 258, + 239, + 272 + ], + "score": 1.0, + "content": "not linear in the vectors", + "type": "text" + }, + { + "bbox": [ + 239, + 259, + 250, + 270 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 258, + 268, + 272 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 269, + 259, + 281, + 272 + ], + "score": 0.9, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 258, + 285, + 272 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 129, + 275, + 506, + 291 + ], + "spans": [ + { + "bbox": [ + 129, + 276, + 207, + 291 + ], + "score": 1.0, + "content": "3. The columns of", + "type": "text" + }, + { + "bbox": [ + 207, + 275, + 224, + 290 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 276, + 506, + 291 + ], + "score": 1.0, + "content": "are not independent with each other, so if we condition on all the other", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 142, + 289, + 285, + 304 + ], + "spans": [ + { + "bbox": [ + 142, + 291, + 181, + 304 + ], + "score": 1.0, + "content": "columns,", + "type": "text" + }, + { + "bbox": [ + 181, + 289, + 199, + 304 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 291, + 285, + 304 + ], + "score": 1.0, + "content": "is no longer random.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 11.5 + }, + { + "type": "text", + "bbox": [ + 106, + 313, + 504, + 336 + ], + "lines": [ + { + "bbox": [ + 106, + 313, + 505, + 326 + ], + "spans": [ + { + "bbox": [ + 106, + 313, + 505, + 326 + ], + "score": 1.0, + "content": "To address the first obstacle, we will prove a stronger version of Lemma 20 that allows a special", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 324, + 142, + 337 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 142, + 337 + ], + "score": 1.0, + "content": "column.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5 + }, + { + "type": "text", + "bbox": [ + 106, + 339, + 505, + 389 + ], + "lines": [ + { + "bbox": [ + 104, + 337, + 506, + 353 + ], + "spans": [ + { + "bbox": [ + 104, + 337, + 181, + 353 + ], + "score": 1.0, + "content": "Lemma 21. Let", + "type": "text" + }, + { + "bbox": [ + 181, + 339, + 249, + 351 + ], + "score": 0.89, + "content": "\\textit { A } \\in \\mathbb { R } ^ { d \\times ( n + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 340, + 316, + 352 + ], + "score": 0.84, + "content": "( d ~ \\geq ~ n + 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 337, + 506, + 353 + ], + "score": 1.0, + "content": "be an arbitrary matrix whose columns are", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 350, + 505, + 364 + ], + "spans": [ + { + "bbox": [ + 107, + 351, + 165, + 363 + ], + "score": 0.9, + "content": "A _ { 0 } , A _ { 1 } , . . . , A _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 350, + 207, + 364 + ], + "score": 1.0, + "content": ". For any", + "type": "text" + }, + { + "bbox": [ + 207, + 352, + 264, + 362 + ], + "score": 0.88, + "content": "i = 1 , 2 , . . . , n ,", + "type": "inline_equation" + }, + { + "bbox": [ + 265, + 350, + 281, + 364 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 282, + 352, + 298, + 362 + ], + "score": 0.85, + "content": "S _ { - i }", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 350, + 505, + 364 + ], + "score": 1.0, + "content": "be the subspace spanned by all the other columns", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 362, + 505, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 150, + 376 + ], + "score": 1.0, + "content": "(including", + "type": "text" + }, + { + "bbox": [ + 150, + 363, + 163, + 374 + ], + "score": 0.81, + "content": "A _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 362, + 208, + 376 + ], + "score": 1.0, + "content": ") except for", + "type": "text" + }, + { + "bbox": [ + 208, + 363, + 219, + 373 + ], + "score": 0.86, + "content": "A _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 362, + 252, + 376 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 253, + 362, + 419, + 376 + ], + "score": 0.9, + "content": "\\begin{array} { r } { d ^ { \\prime } ( A ) : = \\operatorname* { m i n } _ { i = 1 , \\ldots , n } \\left| \\left| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \\right| \\right| } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 362, + 505, + 376 + ], + "score": 1.0, + "content": ". Suppose the column", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 107, + 375, + 343, + 389 + ], + "spans": [ + { + "bbox": [ + 107, + 377, + 119, + 388 + ], + "score": 0.86, + "content": "A _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 120, + 375, + 161, + 389 + ], + "score": 1.0, + "content": "has norm", + "type": "text" + }, + { + "bbox": [ + 161, + 375, + 176, + 388 + ], + "score": 0.89, + "content": "\\sqrt { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 375, + 194, + 389 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 195, + 376, + 237, + 388 + ], + "score": 0.92, + "content": "A _ { 1 } , . . . , A _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 375, + 310, + 389 + ], + "score": 1.0, + "content": "has norm at most", + "type": "text" + }, + { + "bbox": [ + 310, + 377, + 319, + 387 + ], + "score": 0.79, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 319, + 375, + 343, + 389 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18.5 + }, + { + "type": "interline_equation", + "bbox": [ + 191, + 394, + 419, + 422 + ], + "lines": [ + { + "bbox": [ + 191, + 394, + 419, + 422 + ], + "spans": [ + { + "bbox": [ + 191, + 394, + 419, + 422 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\operatorname* { m i n } { \\Bigl ( } { \\sqrt { \\frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \\prime } ( A ) { \\Bigr ) } .", + "type": "interline_equation", + "image_path": "200f671dae57b351f811bbce765f864f5e9c95248880c668f14c8e54edbddb1d.jpg" + } + ] + } + ], + "index": 21, + "virtual_lines": [ + { + "bbox": [ + 191, + 394, + 419, + 422 + ], + "spans": [], + "index": 21 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 433, + 505, + 467 + ], + "lines": [ + { + "bbox": [ + 106, + 433, + 505, + 444 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 505, + 444 + ], + "score": 1.0, + "content": "This lemma shows that if we can bound the leave-one-out distance for all but one column, then the", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "score": 1.0, + "content": "smallest singular value of the matrix is still lowerbounded as long as the columns do not have very", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 455, + 312, + 467 + ], + "spans": [ + { + "bbox": [ + 106, + 455, + 312, + 467 + ], + "score": 1.0, + "content": "different norms. We defer the proof to Section C.2.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23 + }, + { + "type": "text", + "bbox": [ + 107, + 471, + 501, + 495 + ], + "lines": [ + { + "bbox": [ + 105, + 470, + 502, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 470, + 502, + 485 + ], + "score": 1.0, + "content": "For the second obstacle, we show that these coefficients are lowerbounded with high probability.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 482, + 433, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 433, + 496 + ], + "score": 1.0, + "content": "Therefore we can condition on the event that all the coefficients are large enough.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25.5 + }, + { + "type": "text", + "bbox": [ + 106, + 497, + 505, + 537 + ], + "lines": [ + { + "bbox": [ + 105, + 496, + 506, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 496, + 245, + 512 + ], + "score": 1.0, + "content": "Lemma 22. Given weight vectors", + "type": "text" + }, + { + "bbox": [ + 246, + 501, + 257, + 509 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 496, + 276, + 512 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 276, + 500, + 289, + 511 + ], + "score": 0.87, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 496, + 334, + 512 + ], + "score": 1.0, + "content": "with norm", + "type": "text" + }, + { + "bbox": [ + 334, + 498, + 400, + 511 + ], + "score": 0.89, + "content": "\\| w _ { i } \\| , \\| w _ { j } \\| \\leq \\tau ,", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 496, + 416, + 512 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 417, + 498, + 506, + 510 + ], + "score": 0.87, + "content": "\\widetilde { w } _ { i } = w _ { i } + \\rho \\varepsilon _ { i } , \\widetilde { w } _ { j } =", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 509, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 512, + 142, + 523 + ], + "score": 0.91, + "content": "w _ { j } + \\rho \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 509, + 169, + 524 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 170, + 513, + 192, + 523 + ], + "score": 0.85, + "content": "\\varepsilon _ { i } , \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 509, + 433, + 524 + ], + "score": 1.0, + "content": "eare i.i.d. 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In particular, if", + "type": "text" + }, + { + "bbox": [ + 352, + 579, + 420, + 594 + ], + "score": 0.9, + "content": "\\widetilde { \\cdot } \\widetilde { W } = W + \\rho E", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 580, + 450, + 594 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 450, + 582, + 459, + 592 + ], + "score": 0.82, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 580, + 505, + 594 + ], + "score": 1.0, + "content": "is an i.i.d.", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 594, + 505, + 608 + ], + "spans": [ + { + "bbox": [ + 106, + 594, + 306, + 608 + ], + "score": 1.0, + "content": "Gaussian random matrix, with probability at least", + "type": "text" + }, + { + "bbox": [ + 307, + 594, + 373, + 607 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 594, + 412, + 608 + ], + "score": 1.0, + "content": ", for all i,", + "type": "text" + }, + { + "bbox": [ + 412, + 594, + 501, + 607 + ], + "score": 0.91, + "content": "\\| \\widetilde { w } _ { i } \\| \\le \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 594, + 505, + 608 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 606, + 504, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 606, + 150, + 632 + ], + "score": 1.0, + "content": "and for all", + "type": "text" + }, + { + "bbox": [ + 151, + 613, + 173, + 624 + ], + "score": 0.89, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 173, + 606, + 234, + 632 + ], + "score": 1.0, + "content": ", the coefficient", + "type": "text" + }, + { + "bbox": [ + 235, + 610, + 260, + 625 + ], + "score": 0.93, + "content": "\\widetilde { \\phi } _ { i j } / \\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 606, + 338, + 632 + ], + "score": 1.0, + "content": "in front of the term", + "type": "text" + }, + { + "bbox": [ + 338, + 611, + 399, + 626 + ], + "score": 0.96, + "content": "\\widetilde { w } _ { i } \\widetilde { w } _ { j } ^ { \\top } + \\widetilde { w } _ { j } \\widetilde { w } _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 606, + 441, + 632 + ], + "score": 1.0, + "content": "is at least", + "type": "text" + }, + { + "bbox": [ + 442, + 607, + 501, + 631 + ], + "score": 0.91, + "content": "\\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { ( \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } d } ) \\pi }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 606, + 504, + 632 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 106, + 639, + 505, + 662 + ], + "lines": [ + { + "bbox": [ + 106, + 639, + 505, + 652 + ], + "spans": [ + { + "bbox": [ + 106, + 639, + 326, + 652 + ], + "score": 1.0, + "content": "This lemma intuitively says that after the perturbation", + "type": "text" + }, + { + "bbox": [ + 327, + 640, + 338, + 650 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 639, + 357, + 652 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 357, + 640, + 370, + 652 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 639, + 505, + 652 + ], + "score": 1.0, + "content": "cannot be close to co-linear. We", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 650, + 264, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 650, + 264, + 663 + ], + "score": 1.0, + "content": "defer the detailed proof to Section C.2.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35.5 + }, + { + "type": "text", + "bbox": [ + 107, + 667, + 505, + 690 + ], + "lines": [ + { + "bbox": [ + 105, + 666, + 505, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 680 + ], + "score": 1.0, + "content": "For the final obstacle, we use ideas very similar to Ma et al. (2016) which decouples the randomness", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 677, + 171, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 171, + 690 + ], + "score": 1.0, + "content": "of the columns.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37.5 + }, + { + "type": "text", + "bbox": [ + 107, + 698, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 699, + 505, + 710 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 213, + 710 + ], + "score": 1.0, + "content": "Proof of Theorem 9. Let", + "type": "text" + }, + { + "bbox": [ + 214, + 699, + 226, + 710 + ], + "score": 0.88, + "content": "E _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 699, + 431, + 710 + ], + "score": 1.0, + "content": "be the event that Lemma 22 does not hold. Event", + "type": "text" + }, + { + "bbox": [ + 432, + 699, + 444, + 710 + ], + "score": 0.88, + "content": "E _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 699, + 505, + 710 + ], + "score": 1.0, + "content": "will be one of", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 315, + 722 + ], + "score": 1.0, + "content": "the bad events (but note that we do not condition on", + "type": "text" + }, + { + "bbox": [ + 316, + 711, + 328, + 721 + ], + "score": 0.89, + "content": "E _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "not happening, we use a union bound at the", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 104, + 720, + 130, + 734 + ], + "spans": [ + { + "bbox": [ + 104, + 720, + 130, + 734 + ], + "score": 1.0, + "content": "end).", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 40 + } + ], + "page_idx": 36, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 39 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 39 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "37", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 506, + 96 + ], + "score": 1.0, + "content": "Rudelson & Vershynin (2009) showed that one can lowerbound the smallest singular value of a", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 254, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 254, + 106 + ], + "score": 1.0, + "content": "matrix by its leave-one-out distance.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 105, + 81, + 506, + 106 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 108, + 504, + 134 + ], + "lines": [ + { + "bbox": [ + 105, + 106, + 506, + 122 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 344, + 122 + ], + "score": 1.0, + "content": "Lemma 20 (Rudelson & Vershynin (2009)). For matrix", + "type": "text" + }, + { + "bbox": [ + 344, + 108, + 431, + 121 + ], + "score": 0.92, + "content": "A \\ \\in \\ \\mathbb { R } ^ { d \\times n } ( d \\ \\geq \\ n )", + "type": "inline_equation" + }, + { + "bbox": [ + 432, + 106, + 506, + 122 + ], + "score": 1.0, + "content": ", we always have", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 117, + 228, + 135 + ], + "spans": [ + { + "bbox": [ + 106, + 119, + 223, + 135 + ], + "score": 0.92, + "content": "\\begin{array} { r } { d ( A ) \\geq \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\frac { 1 } { \\sqrt { n } } d ( A ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 117, + 228, + 135 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5, + "bbox_fs": [ + 105, + 106, + 506, + 135 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 144, + 505, + 207 + ], + "lines": [ + { + "bbox": [ + 106, + 144, + 505, + 159 + ], + "spans": [ + { + "bbox": [ + 106, + 145, + 193, + 159 + ], + "score": 1.0, + "content": "Therefore, to bound", + "type": "text" + }, + { + "bbox": [ + 193, + 144, + 232, + 159 + ], + "score": 0.94, + "content": "\\sigma _ { \\mathrm { m i n } } ( \\widetilde { M } )", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 145, + 354, + 159 + ], + "score": 1.0, + "content": "we just need to lowerbound", + "type": "text" + }, + { + "bbox": [ + 355, + 144, + 379, + 159 + ], + "score": 0.93, + "content": "d ( \\widetilde { M } )", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 145, + 505, + 159 + ], + "score": 1.0, + "content": ". We use the ideas similar to", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 157, + 505, + 172 + ], + "spans": [ + { + "bbox": [ + 106, + 159, + 380, + 172 + ], + "score": 1.0, + "content": "Bhaskara et al. (2014) and Ma et al. (2016). Since every column of", + "type": "text" + }, + { + "bbox": [ + 380, + 158, + 392, + 170 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 159, + 440, + 172 + ], + "score": 1.0, + "content": "(except for", + "type": "text" + }, + { + "bbox": [ + 440, + 157, + 456, + 171 + ], + "score": 0.86, + "content": "\\widetilde { M } _ { 0 } ^ { \\mathrm { ~ ~ } }", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 159, + 505, + 172 + ], + "score": 1.0, + "content": ") is random,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 171, + 504, + 182 + ], + "spans": [ + { + "bbox": [ + 106, + 171, + 504, + 182 + ], + "score": 1.0, + "content": "we will try to show that even if we condition on all the other columns, because of the randomness", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 181, + 506, + 198 + ], + "spans": [ + { + "bbox": [ + 105, + 182, + 117, + 198 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 182, + 135, + 196 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 182, + 225, + 198 + ], + "score": 1.0, + "content": ", the distance between", + "type": "text" + }, + { + "bbox": [ + 225, + 181, + 243, + 196 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 182, + 506, + 198 + ], + "score": 1.0, + "content": "to the span of other columns is large. However, there are several", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 195, + 214, + 207 + ], + "spans": [ + { + "bbox": [ + 106, + 195, + 214, + 207 + ], + "score": 1.0, + "content": "obstacles in this approach:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6, + "bbox_fs": [ + 105, + 144, + 506, + 207 + ] + }, + { + "type": "list", + "bbox": [ + 129, + 217, + 505, + 304 + ], + "lines": [ + { + "bbox": [ + 129, + 217, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 129, + 217, + 294, + 233 + ], + "score": 1.0, + "content": "1. The augmented distinguishing matrix", + "type": "text" + }, + { + "bbox": [ + 294, + 217, + 306, + 230 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 306, + 217, + 392, + 233 + ], + "score": 1.0, + "content": "has a special column", + "type": "text" + }, + { + "bbox": [ + 392, + 217, + 450, + 232 + ], + "score": 0.93, + "content": "{ \\widetilde { M } } _ { 0 } = \\operatorname { v e c } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 217, + 506, + 233 + ], + "score": 1.0, + "content": "that does not", + "type": "text" + } + ], + "index": 9, + "is_list_start_line": true + }, + { + "bbox": [ + 141, + 230, + 233, + 243 + ], + "spans": [ + { + "bbox": [ + 141, + 230, + 233, + 243 + ], + "score": 1.0, + "content": "have any randomness.", + "type": "text" + } + ], + "index": 10, + "is_list_end_line": true + }, + { + "bbox": [ + 128, + 246, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 128, + 246, + 270, + 261 + ], + "score": 1.0, + "content": "2. The closed form expression for", + "type": "text" + }, + { + "bbox": [ + 270, + 246, + 282, + 258 + ], + "score": 0.86, + "content": "\\widetilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 246, + 505, + 261 + ], + "score": 1.0, + "content": "(as in Lemma 19) has complicated coefficients that are", + "type": "text" + } + ], + "index": 11, + "is_list_start_line": true + }, + { + "bbox": [ + 141, + 258, + 285, + 272 + ], + "spans": [ + { + "bbox": [ + 141, + 258, + 239, + 272 + ], + "score": 1.0, + "content": "not linear in the vectors", + "type": "text" + }, + { + "bbox": [ + 239, + 259, + 250, + 270 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 258, + 268, + 272 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 269, + 259, + 281, + 272 + ], + "score": 0.9, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 258, + 285, + 272 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 12, + "is_list_end_line": true + }, + { + "bbox": [ + 129, + 275, + 506, + 291 + ], + "spans": [ + { + "bbox": [ + 129, + 276, + 207, + 291 + ], + "score": 1.0, + "content": "3. The columns of", + "type": "text" + }, + { + "bbox": [ + 207, + 275, + 224, + 290 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 276, + 506, + 291 + ], + "score": 1.0, + "content": "are not independent with each other, so if we condition on all the other", + "type": "text" + } + ], + "index": 13, + "is_list_start_line": true + }, + { + "bbox": [ + 142, + 289, + 285, + 304 + ], + "spans": [ + { + "bbox": [ + 142, + 291, + 181, + 304 + ], + "score": 1.0, + "content": "columns,", + "type": "text" + }, + { + "bbox": [ + 181, + 289, + 199, + 304 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 291, + 285, + 304 + ], + "score": 1.0, + "content": "is no longer random.", + "type": "text" + } + ], + "index": 14, + "is_list_end_line": true + } + ], + "index": 11.5, + "bbox_fs": [ + 128, + 217, + 506, + 304 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 313, + 504, + 336 + ], + "lines": [ + { + "bbox": [ + 106, + 313, + 505, + 326 + ], + "spans": [ + { + "bbox": [ + 106, + 313, + 505, + 326 + ], + "score": 1.0, + "content": "To address the first obstacle, we will prove a stronger version of Lemma 20 that allows a special", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 324, + 142, + 337 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 142, + 337 + ], + "score": 1.0, + "content": "column.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 313, + 505, + 337 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 339, + 505, + 389 + ], + "lines": [ + { + "bbox": [ + 104, + 337, + 506, + 353 + ], + "spans": [ + { + "bbox": [ + 104, + 337, + 181, + 353 + ], + "score": 1.0, + "content": "Lemma 21. Let", + "type": "text" + }, + { + "bbox": [ + 181, + 339, + 249, + 351 + ], + "score": 0.89, + "content": "\\textit { A } \\in \\mathbb { R } ^ { d \\times ( n + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 340, + 316, + 352 + ], + "score": 0.84, + "content": "( d ~ \\geq ~ n + 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 337, + 506, + 353 + ], + "score": 1.0, + "content": "be an arbitrary matrix whose columns are", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 350, + 505, + 364 + ], + "spans": [ + { + "bbox": [ + 107, + 351, + 165, + 363 + ], + "score": 0.9, + "content": "A _ { 0 } , A _ { 1 } , . . . , A _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 350, + 207, + 364 + ], + "score": 1.0, + "content": ". For any", + "type": "text" + }, + { + "bbox": [ + 207, + 352, + 264, + 362 + ], + "score": 0.88, + "content": "i = 1 , 2 , . . . , n ,", + "type": "inline_equation" + }, + { + "bbox": [ + 265, + 350, + 281, + 364 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 282, + 352, + 298, + 362 + ], + "score": 0.85, + "content": "S _ { - i }", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 350, + 505, + 364 + ], + "score": 1.0, + "content": "be the subspace spanned by all the other columns", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 362, + 505, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 150, + 376 + ], + "score": 1.0, + "content": "(including", + "type": "text" + }, + { + "bbox": [ + 150, + 363, + 163, + 374 + ], + "score": 0.81, + "content": "A _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 362, + 208, + 376 + ], + "score": 1.0, + "content": ") except for", + "type": "text" + }, + { + "bbox": [ + 208, + 363, + 219, + 373 + ], + "score": 0.86, + "content": "A _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 362, + 252, + 376 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 253, + 362, + 419, + 376 + ], + "score": 0.9, + "content": "\\begin{array} { r } { d ^ { \\prime } ( A ) : = \\operatorname* { m i n } _ { i = 1 , \\ldots , n } \\left| \\left| ( I _ { d } - P r o j _ { S _ { - i } } ) A _ { i } \\right| \\right| } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 362, + 505, + 376 + ], + "score": 1.0, + "content": ". Suppose the column", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 107, + 375, + 343, + 389 + ], + "spans": [ + { + "bbox": [ + 107, + 377, + 119, + 388 + ], + "score": 0.86, + "content": "A _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 120, + 375, + 161, + 389 + ], + "score": 1.0, + "content": "has norm", + "type": "text" + }, + { + "bbox": [ + 161, + 375, + 176, + 388 + ], + "score": 0.89, + "content": "\\sqrt { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 375, + 194, + 389 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 195, + 376, + 237, + 388 + ], + "score": 0.92, + "content": "A _ { 1 } , . . . , A _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 375, + 310, + 389 + ], + "score": 1.0, + "content": "has norm at most", + "type": "text" + }, + { + "bbox": [ + 310, + 377, + 319, + 387 + ], + "score": 0.79, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 319, + 375, + 343, + 389 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18.5, + "bbox_fs": [ + 104, + 337, + 506, + 389 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 191, + 394, + 419, + 422 + ], + "lines": [ + { + "bbox": [ + 191, + 394, + 419, + 422 + ], + "spans": [ + { + "bbox": [ + 191, + 394, + 419, + 422 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\operatorname* { m i n } { \\Bigl ( } { \\sqrt { \\frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \\prime } ( A ) { \\Bigr ) } .", + "type": "interline_equation", + "image_path": "200f671dae57b351f811bbce765f864f5e9c95248880c668f14c8e54edbddb1d.jpg" + } + ] + } + ], + "index": 21, + "virtual_lines": [ + { + "bbox": [ + 191, + 394, + 419, + 422 + ], + "spans": [], + "index": 21 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 433, + 505, + 467 + ], + "lines": [ + { + "bbox": [ + 106, + 433, + 505, + 444 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 505, + 444 + ], + "score": 1.0, + "content": "This lemma shows that if we can bound the leave-one-out distance for all but one column, then the", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "score": 1.0, + "content": "smallest singular value of the matrix is still lowerbounded as long as the columns do not have very", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 455, + 312, + 467 + ], + "spans": [ + { + "bbox": [ + 106, + 455, + 312, + 467 + ], + "score": 1.0, + "content": "different norms. We defer the proof to Section C.2.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23, + "bbox_fs": [ + 105, + 433, + 505, + 467 + ] + }, + { + "type": "list", + "bbox": [ + 107, + 471, + 501, + 495 + ], + "lines": [ + { + "bbox": [ + 105, + 470, + 502, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 470, + 502, + 485 + ], + "score": 1.0, + "content": "For the second obstacle, we show that these coefficients are lowerbounded with high probability.", + "type": "text" + } + ], + "index": 25, + "is_list_end_line": true + }, + { + "bbox": [ + 105, + 482, + 433, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 433, + 496 + ], + "score": 1.0, + "content": "Therefore we can condition on the event that all the coefficients are large enough.", + "type": "text" + } + ], + "index": 26, + "is_list_start_line": true, + "is_list_end_line": true + } + ], + "index": 25.5, + "bbox_fs": [ + 105, + 470, + 502, + 496 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 497, + 505, + 537 + ], + "lines": [ + { + "bbox": [ + 105, + 496, + 506, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 496, + 245, + 512 + ], + "score": 1.0, + "content": "Lemma 22. Given weight vectors", + "type": "text" + }, + { + "bbox": [ + 246, + 501, + 257, + 509 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 496, + 276, + 512 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 276, + 500, + 289, + 511 + ], + "score": 0.87, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 496, + 334, + 512 + ], + "score": 1.0, + "content": "with norm", + "type": "text" + }, + { + "bbox": [ + 334, + 498, + 400, + 511 + ], + "score": 0.89, + "content": "\\| w _ { i } \\| , \\| w _ { j } \\| \\leq \\tau ,", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 496, + 416, + 512 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 417, + 498, + 506, + 510 + ], + "score": 0.87, + "content": "\\widetilde { w } _ { i } = w _ { i } + \\rho \\varepsilon _ { i } , \\widetilde { w } _ { j } =", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 509, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 512, + 142, + 523 + ], + "score": 0.91, + "content": "w _ { j } + \\rho \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 509, + 169, + 524 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 170, + 513, + 192, + 523 + ], + "score": 0.85, + "content": "\\varepsilon _ { i } , \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 509, + 433, + 524 + ], + "score": 1.0, + "content": "eare i.i.d. 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In particular, if", + "type": "text" + }, + { + "bbox": [ + 352, + 579, + 420, + 594 + ], + "score": 0.9, + "content": "\\widetilde { \\cdot } \\widetilde { W } = W + \\rho E", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 580, + 450, + 594 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 450, + 582, + 459, + 592 + ], + "score": 0.82, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 580, + 505, + 594 + ], + "score": 1.0, + "content": "is an i.i.d.", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 594, + 505, + 608 + ], + "spans": [ + { + "bbox": [ + 106, + 594, + 306, + 608 + ], + "score": 1.0, + "content": "Gaussian random matrix, with probability at least", + "type": "text" + }, + { + "bbox": [ + 307, + 594, + 373, + 607 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 594, + 412, + 608 + ], + "score": 1.0, + "content": ", for all i,", + "type": "text" + }, + { + "bbox": [ + 412, + 594, + 501, + 607 + ], + "score": 0.91, + "content": "\\| \\widetilde { w } _ { i } \\| \\le \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 594, + 505, + 608 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 606, + 504, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 606, + 150, + 632 + ], + "score": 1.0, + "content": "and for all", + "type": "text" + }, + { + "bbox": [ + 151, + 613, + 173, + 624 + ], + "score": 0.89, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 173, + 606, + 234, + 632 + ], + "score": 1.0, + "content": ", the coefficient", + "type": "text" + }, + { + "bbox": [ + 235, + 610, + 260, + 625 + ], + "score": 0.93, + "content": "\\widetilde { \\phi } _ { i j } / \\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 606, + 338, + 632 + ], + "score": 1.0, + "content": "in front of the term", + "type": "text" + }, + { + "bbox": [ + 338, + 611, + 399, + 626 + ], + "score": 0.96, + "content": "\\widetilde { w } _ { i } \\widetilde { w } _ { j } ^ { \\top } + \\widetilde { w } _ { j } \\widetilde { w } _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 606, + 441, + 632 + ], + "score": 1.0, + "content": "is at least", + "type": "text" + }, + { + "bbox": [ + 442, + 607, + 501, + 631 + ], + "score": 0.91, + "content": "\\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { ( \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } d } ) \\pi }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 606, + 504, + 632 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33, + "bbox_fs": [ + 105, + 579, + 505, + 632 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 639, + 505, + 662 + ], + "lines": [ + { + "bbox": [ + 106, + 639, + 505, + 652 + ], + "spans": [ + { + "bbox": [ + 106, + 639, + 326, + 652 + ], + "score": 1.0, + "content": "This lemma intuitively says that after the perturbation", + "type": "text" + }, + { + "bbox": [ + 327, + 640, + 338, + 650 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 639, + 357, + 652 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 357, + 640, + 370, + 652 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 639, + 505, + 652 + ], + "score": 1.0, + "content": "cannot be close to co-linear. We", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 650, + 264, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 650, + 264, + 663 + ], + "score": 1.0, + "content": "defer the detailed proof to Section C.2.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 35.5, + "bbox_fs": [ + 106, + 639, + 505, + 663 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 667, + 505, + 690 + ], + "lines": [ + { + "bbox": [ + 105, + 666, + 505, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 680 + ], + "score": 1.0, + "content": "For the final obstacle, we use ideas very similar to Ma et al. (2016) which decouples the randomness", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 677, + 171, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 171, + 690 + ], + "score": 1.0, + "content": "of the columns.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37.5, + "bbox_fs": [ + 105, + 666, + 505, + 690 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 698, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 699, + 505, + 710 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 213, + 710 + ], + "score": 1.0, + "content": "Proof of Theorem 9. Let", + "type": "text" + }, + { + "bbox": [ + 214, + 699, + 226, + 710 + ], + "score": 0.88, + "content": "E _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 699, + 431, + 710 + ], + "score": 1.0, + "content": "be the event that Lemma 22 does not hold. 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That is, the columns of", + "type": "text" + }, + { + "bbox": [ + 254, + 94, + 268, + 106 + ], + "score": 0.9, + "content": "{ \\widetilde { M } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 95, + 285, + 109 + ], + "score": 1.0, + "content": "are", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 118, + 505, + 147 + ], + "lines": [ + { + "bbox": [ + 111, + 118, + 505, + 147 + ], + "spans": [ + { + "bbox": [ + 111, + 118, + 505, + 147 + ], + "score": 0.88, + "content": "\\widetilde { \\mathcal { M } } _ { i j } ^ { \\prime } = \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\big ( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } + \\widetilde { w } _ { j , L _ { 1 } } \\otimes \\widetilde { w } _ { i , L _ { 2 } } \\big ) - \\frac { \\sin \\big ( \\widetilde { \\phi } _ { i j } \\big ) } { \\pi } \\big ( \\frac { \\| \\widetilde { w } _ { i } \\| } { \\| \\widetilde { w } _ { j } \\| } \\widetilde { w } _ { j , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } + \\frac { \\| \\widetilde { w } _ { j } \\| } { \\| \\widetilde { w } _ { i } \\| } \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { i , L _ { 2 } } \\big ) ,", + "type": "interline_equation", + "image_path": "293d1eaca3f9197e08805889e06933c8302cb3ae3f16a7013e1d94e4abd6498b.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 111, + 118, + 505, + 147 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 157, + 504, + 181 + ], + "lines": [ + { + "bbox": [ + 106, + 158, + 505, + 170 + ], + "spans": [ + { + "bbox": [ + 106, + 158, + 121, + 169 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 121, + 158, + 145, + 169 + ], + "score": 0.9, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 158, + 176, + 169 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 176, + 158, + 195, + 170 + ], + "score": 0.92, + "content": "\\widetilde { w } _ { i , L }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 158, + 327, + 169 + ], + "score": 1.0, + "content": "denotes the restriction of vector", + "type": "text" + }, + { + "bbox": [ + 327, + 158, + 339, + 169 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 158, + 394, + 169 + ], + "score": 1.0, + "content": "to the subset", + "type": "text" + }, + { + "bbox": [ + 394, + 159, + 402, + 168 + ], + "score": 0.81, + "content": "L", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 158, + 505, + 169 + ], + "score": 1.0, + "content": ". Note that the restriction", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 168, + 379, + 181 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 117, + 181 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 169, + 149, + 181 + ], + "score": 0.77, + "content": "{ \\mathrm { v e c } } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 168, + 243, + 181 + ], + "score": 1.0, + "content": "e to the rows indexed by", + "type": "text" + }, + { + "bbox": [ + 243, + 169, + 279, + 180 + ], + "score": 0.92, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 168, + 379, + 181 + ], + "score": 1.0, + "content": "eis just an all zero vector.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + }, + { + "type": "text", + "bbox": [ + 106, + 186, + 506, + 240 + ], + "lines": [ + { + "bbox": [ + 105, + 185, + 506, + 201 + ], + "spans": [ + { + "bbox": [ + 105, + 186, + 217, + 201 + ], + "score": 1.0, + "content": "We will focus on a column", + "type": "text" + }, + { + "bbox": [ + 217, + 185, + 234, + 201 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 235, + 186, + 256, + 201 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 256, + 188, + 279, + 200 + ], + "score": 0.9, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 186, + 506, + 201 + ], + "score": 1.0, + "content": "and try to prove it has a large distance to the span of all", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 200, + 504, + 218 + ], + "spans": [ + { + "bbox": [ + 105, + 200, + 202, + 218 + ], + "score": 1.0, + "content": "the other columns. Let", + "type": "text" + }, + { + "bbox": [ + 203, + 203, + 216, + 215 + ], + "score": 0.9, + "content": "V _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 200, + 427, + 218 + ], + "score": 1.0, + "content": "be the span of all other columns, which is equal to", + "type": "text" + }, + { + "bbox": [ + 428, + 200, + 504, + 216 + ], + "score": 0.91, + "content": "V _ { i j } = \\mathrm { s p a n } \\{ \\widetilde { M } _ { k l } ^ { \\prime } :", + "type": "inline_equation" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 214, + 505, + 229 + ], + "spans": [ + { + "bbox": [ + 106, + 216, + 205, + 228 + ], + "score": 0.91, + "content": "k < l \\wedge ( k , l ) \\neq ( i , j ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 216, + 361, + 229 + ], + "score": 1.0, + "content": "(note that we do not need to consider", + "type": "text" + }, + { + "bbox": [ + 361, + 214, + 376, + 228 + ], + "score": 0.9, + "content": "\\widetilde { M } _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 216, + 505, + 229 + ], + "score": 1.0, + "content": "because that column is 0 when", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 226, + 196, + 241 + ], + "spans": [ + { + "bbox": [ + 105, + 226, + 156, + 241 + ], + "score": 1.0, + "content": "restricted to", + "type": "text" + }, + { + "bbox": [ + 156, + 228, + 192, + 239 + ], + "score": 0.91, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 226, + 196, + 241 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6.5 + }, + { + "type": "text", + "bbox": [ + 105, + 244, + 506, + 269 + ], + "lines": [ + { + "bbox": [ + 105, + 244, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 244, + 161, + 261 + ], + "score": 1.0, + "content": "It’s clear that", + "type": "text" + }, + { + "bbox": [ + 161, + 246, + 175, + 258 + ], + "score": 0.9, + "content": "V _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 244, + 248, + 261 + ], + "score": 1.0, + "content": "is correlated with", + "type": "text" + }, + { + "bbox": [ + 248, + 244, + 266, + 260 + ], + "score": 0.91, + "content": "\\widetilde { M } _ { i j } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 244, + 506, + 261 + ], + "score": 1.0, + "content": ", which is bad for the proof. To get around this problem, we", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 253, + 456, + 272 + ], + "spans": [ + { + "bbox": [ + 104, + 253, + 437, + 272 + ], + "score": 1.0, + "content": "f follow the idea of Ma et al. 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To get around this problem, we", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 253, + 456, + 272 + ], + "spans": [ + { + "bbox": [ + 104, + 253, + 437, + 272 + ], + "score": 1.0, + "content": "f follow the idea of Ma et al. 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Moreover, subspace", + "type": "text" + }, + { + "bbox": [ + 343, + 394, + 510, + 429 + ], + "score": 1.0, + "content": ". Then by Lemma 31, we know that with", + "type": "text" + }, + { + "bbox": [ + 395, + 388, + 409, + 402 + ], + "score": 0.91, + "content": "\\hat { V } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 387, + 506, + 402 + ], + "score": 1.0, + "content": "has dimension at most", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 184, + 416, + 253, + 429 + ], + "spans": [ + { + "bbox": [ + 184, + 416, + 253, + 429 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + } + ], + "index": 16 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 387, + 510, + 429 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 223, + 438, + 387, + 457 + ], + "lines": [ + { + "bbox": [ + 223, + 438, + 387, + 457 + ], + "spans": [ + { + "bbox": [ + 223, + 438, + 387, + 457 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\left( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } \\right) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) . } \\end{array}", + "type": "interline_equation", + "image_path": "e44571cb73b58bf0af774e281a6423478a5f401287041745c4bdf48bcf4ab7e2.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 223, + 438, + 387, + 457 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 466, + 374, + 478 + ], + "lines": [ + { + "bbox": [ + 104, + 464, + 375, + 481 + ], + "spans": [ + { + "bbox": [ + 104, + 464, + 122, + 481 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 467, + 135, + 478 + ], + "score": 0.89, + "content": "E _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 464, + 357, + 481 + ], + "score": 1.0, + "content": "be the event that this inequality does not hold for some", + "type": "text" + }, + { + "bbox": [ + 357, + 468, + 371, + 478 + ], + "score": 0.89, + "content": "i , j", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 464, + 375, + 481 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18, + "bbox_fs": [ + 104, + 464, + 375, + 481 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 484, + 505, + 509 + ], + "lines": [ + { + "bbox": [ + 105, + 483, + 506, + 500 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 122, + 500 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 483, + 315, + 498 + ], + "score": 0.91, + "content": "S _ { i j } = \\mathrm { s p a n } \\{ \\widetilde { M } _ { 0 } , \\widetilde { M } _ { k l } : k < l \\land ( k , l ) \\neq ( i , j ) \\} .", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 483, + 479, + 500 + ], + "score": 1.0, + "content": ". Now we know when neither bad events", + "type": "text" + }, + { + "bbox": [ + 480, + 486, + 492, + 497 + ], + "score": 0.89, + "content": "E _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 483, + 506, + 500 + ], + "score": 1.0, + "content": "or", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 107, + 495, + 242, + 510 + ], + "spans": [ + { + "bbox": [ + 107, + 497, + 119, + 508 + ], + "score": 0.88, + "content": "E _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 120, + 495, + 215, + 510 + ], + "score": 1.0, + "content": "happens, for every pair", + "type": "text" + }, + { + "bbox": [ + 215, + 498, + 237, + 509 + ], + "score": 0.89, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 495, + 242, + 510 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19.5, + "bbox_fs": [ + 105, + 483, + 506, + 510 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 220, + 518, + 390, + 601 + ], + "lines": [ + { + "bbox": [ + 220, + 518, + 390, + 601 + ], + "spans": [ + { + "bbox": [ + 220, + 518, + 390, + 601 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } \\ge \\mathrm { P r o j } _ { V _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } ^ { \\prime } } \\\\ & { \\qquad \\ge \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\widetilde { M } _ { i j } ^ { \\prime } } \\\\ & { \\qquad = \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\mathrm { P r o j } _ { \\hat { V } _ { i j } ^ { \\perp } } \\left( \\widetilde { w } _ { i , L _ { 1 } } \\otimes \\widetilde { w } _ { j , L _ { 2 } } \\right) } \\\\ & { \\qquad \\ge \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) . } \\end{array}", + "type": "interline_equation", + "image_path": "269380e7eee6006b385dc12efc8dde1841a96fcd5b0f25132b7c99601c88e20b.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 220, + 518, + 390, + 534.6 + ], + "spans": [], + "index": 21 + }, + { + "bbox": [ + 220, + 534.6, + 390, + 551.2 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 220, + 551.2, + 390, + 567.8000000000001 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 220, + 567.8000000000001, + 390, + 584.4000000000001 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 220, + 584.4000000000001, + 390, + 601.0000000000001 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 617, + 506, + 653 + ], + "lines": [ + { + "bbox": [ + 106, + 617, + 506, + 632 + ], + "spans": [ + { + "bbox": [ + 106, + 618, + 268, + 632 + ], + "score": 1.0, + "content": "Currently, we have proved that for any", + "type": "text" + }, + { + "bbox": [ + 268, + 620, + 294, + 631 + ], + "score": 0.91, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 618, + 419, + 632 + ], + "score": 1.0, + "content": ", the distance between column", + "type": "text" + }, + { + "bbox": [ + 420, + 617, + 437, + 632 + ], + "score": 0.92, + "content": "\\widetilde { M } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 618, + 506, + 632 + ], + "score": 1.0, + "content": "and the span of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 630, + 505, + 643 + ], + "spans": [ + { + "bbox": [ + 106, + 630, + 505, + 643 + ], + "score": 1.0, + "content": "other columns is at least inverse polynomial. To use Lemma 21 we just need to give a bound on the", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 640, + 413, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 331, + 654 + ], + "score": 1.0, + "content": "norms of these columns. By Lemma 22, we know when", + "type": "text" + }, + { + "bbox": [ + 332, + 642, + 344, + 653 + ], + "score": 0.89, + "content": "E _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 640, + 413, + 654 + ], + "score": 1.0, + "content": "does not happen", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 27, + "bbox_fs": [ + 105, + 617, + 506, + 654 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 252, + 663, + 357, + 691 + ], + "lines": [ + { + "bbox": [ + 252, + 663, + 357, + 691 + ], + "spans": [ + { + "bbox": [ + 252, + 663, + 357, + 691 + ], + "score": 0.93, + "content": "\\forall i , \\| \\widetilde { w } _ { i } \\| \\leq \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } ,", + "type": "interline_equation", + "image_path": "8b9ff1bf895a5cc0443b1ee775e768ff42659d8f57ccba30fe837d35d7a0f240.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 252, + 663, + 357, + 691 + ], + "spans": [], + "index": 29 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 702, + 505, + 733 + ], + "lines": [ + { + "bbox": [ + 105, + 701, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 702, + 133, + 721 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 709, + 140, + 717 + ], + "score": 0.78, + "content": "\\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 140, + 702, + 390, + 721 + ], + "score": 1.0, + "content": "is the uniform upper bound of the norm of every row vector of", + "type": "text" + }, + { + "bbox": [ + 390, + 707, + 402, + 717 + ], + "score": 0.81, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 702, + 422, + 721 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 422, + 701, + 487, + 722 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\widetilde { \\tau } = \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 702, + 506, + 721 + ], + "score": 1.0, + "content": ", we", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 719, + 205, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 131, + 734 + ], + "score": 1.0, + "content": "know", + "type": "text" + }, + { + "bbox": [ + 131, + 720, + 200, + 732 + ], + "score": 0.92, + "content": "\\widetilde { \\tau } = \\mathrm { p o l y } ( \\tau , d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 719, + 205, + 734 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30.5, + "bbox_fs": [ + 105, + 701, + 506, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 166, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 167, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 167, + 95 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "interline_equation", + "bbox": [ + 199, + 97, + 412, + 203 + ], + "lines": [ + { + "bbox": [ + 199, + 97, + 412, + 203 + ], + "spans": [ + { + "bbox": [ + 199, + 97, + 412, + 203 + ], + "score": 0.94, + "content": "\\begin{array} { l } { \\displaystyle | \\widetilde { M } _ { i j } | | \\le \\frac { 1 } { \\pi } \\bigl ( \\widetilde { \\phi } _ { i j } | \\cos ( \\widetilde { \\phi } _ { i j } ) | + \\sin ( \\widetilde { \\phi } _ { i j } ) \\bigr ) | | \\widetilde { w } _ { i } | | | \\widetilde { w } _ { j } | | \\sqrt { d } } \\\\ { \\displaystyle \\qquad + \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } ( \\| \\widetilde { w } _ { i } \\| \\| \\widetilde { w } _ { j } \\| + \\| \\widetilde { w } _ { j } \\| \\| \\widetilde { w } _ { i } \\| ) } \\\\ { \\displaystyle \\qquad + \\frac { \\sin ( \\widetilde { \\phi } _ { i j } ) } { \\pi } ( \\| \\widetilde { w } _ { i } \\| \\| \\widetilde { w } _ { j } \\| + \\| \\widetilde { w } _ { j } \\| \\| \\widetilde { w } _ { i } \\| ) } \\\\ { \\displaystyle \\qquad \\le \\frac { \\widetilde { \\tau } ^ { 2 } } { \\pi } ( \\pi + 1 ) \\sqrt { d } + 2 \\widetilde { \\tau } ^ { 2 } + \\frac { 2 \\widetilde { \\tau } ^ { 2 } } { \\pi } . } \\end{array}", + "type": "interline_equation", + "image_path": "976005eaf83f38f736b87133d8473d31cf2486f6dde09cc75de494c2c51c5e95.jpg" + } + ] + } + ], + "index": 3.5, + "virtual_lines": [ + { + "bbox": [ + 199, + 97, + 412, + 114.66666666666667 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 199, + 114.66666666666667, + 412, + 132.33333333333334 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 199, + 132.33333333333334, + 412, + 150.0 + ], + "spans": [], + "index": 3 + }, + { + "bbox": [ + 199, + 150.0, + 412, + 167.66666666666666 + ], + "spans": [], + "index": 4 + }, + { + "bbox": [ + 199, + 167.66666666666666, + 412, + 185.33333333333331 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 199, + 185.33333333333331, + 412, + 202.99999999999997 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 207, + 505, + 232 + ], + "lines": [ + { + "bbox": [ + 105, + 206, + 505, + 223 + ], + "spans": [ + { + "bbox": [ + 105, + 207, + 181, + 223 + ], + "score": 1.0, + "content": "Thus, there exists", + "type": "text" + }, + { + "bbox": [ + 181, + 209, + 254, + 221 + ], + "score": 0.92, + "content": "C = \\mathrm { p o l y } ( \\tau , d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 207, + 298, + 223 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 299, + 206, + 349, + 221 + ], + "score": 0.93, + "content": "\\| \\widetilde { M } _ { i j } \\| \\le C", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 207, + 390, + 223 + ], + "score": 1.0, + "content": "for every", + "type": "text" + }, + { + "bbox": [ + 390, + 209, + 415, + 221 + ], + "score": 0.91, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 207, + 505, + 223 + ], + "score": 1.0, + "content": ". Now applying Lem-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 220, + 250, + 232 + ], + "spans": [ + { + "bbox": [ + 106, + 220, + 132, + 230 + ], + "score": 0.29, + "content": "\\mathrm { \\ m a } 2 1", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 220, + 250, + 232 + ], + "score": 1.0, + "content": "immediately gives the result.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7.5 + }, + { + "type": "title", + "bbox": [ + 107, + 244, + 347, + 256 + ], + "lines": [ + { + "bbox": [ + 105, + 243, + 347, + 257 + ], + "spans": [ + { + "bbox": [ + 105, + 243, + 347, + 257 + ], + "score": 1.0, + "content": "C.2 PROOF OF AUXILIARY LEMMAS FOR SECTION C.1", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 105, + 264, + 475, + 277 + ], + "lines": [ + { + "bbox": [ + 106, + 263, + 475, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 475, + 279 + ], + "score": 1.0, + "content": "We will first prove the characterization for columns in the augmented distinguishing matrix.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 106, + 284, + 505, + 319 + ], + "lines": [ + { + "bbox": [ + 105, + 284, + 505, + 298 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 433, + 298 + ], + "score": 1.0, + "content": "Proof of Lemma 19. For simplicity, we start by assuming that every weight vector", + "type": "text" + }, + { + "bbox": [ + 434, + 287, + 445, + 296 + ], + "score": 0.86, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 284, + 505, + 298 + ], + "score": 1.0, + "content": "has unit norm.", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 296, + 505, + 308 + ], + "spans": [ + { + "bbox": [ + 106, + 296, + 391, + 308 + ], + "score": 1.0, + "content": "At the end of the proof we will discuss how to incorporate the norms of", + "type": "text" + }, + { + "bbox": [ + 391, + 297, + 419, + 308 + ], + "score": 0.31, + "content": "w _ { i } , w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 296, + 505, + 308 + ], + "score": 1.0, + "content": ". Also throughout the", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 307, + 385, + 320 + ], + "spans": [ + { + "bbox": [ + 106, + 307, + 249, + 320 + ], + "score": 1.0, + "content": "proof we will abuse notation to use", + "type": "text" + }, + { + "bbox": [ + 249, + 307, + 266, + 319 + ], + "score": 0.91, + "content": "M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 307, + 341, + 320 + ], + "score": 1.0, + "content": "as its matrix form", + "type": "text" + }, + { + "bbox": [ + 341, + 307, + 381, + 319 + ], + "score": 0.71, + "content": "\\mathrm { m a t } ( M _ { i j } )", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 307, + 385, + 320 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 506, + 380 + ], + "lines": [ + { + "bbox": [ + 123, + 324, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 123, + 325, + 137, + 337 + ], + "score": 0.88, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 324, + 257, + 362 + ], + "score": 1.0, + "content": "e subspace spanned by be a set of orthonorma", + "type": "text" + }, + { + "bbox": [ + 258, + 327, + 269, + 336 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 324, + 289, + 362 + ], + "score": 1.0, + "content": "and sis f", + "type": "text" + }, + { + "bbox": [ + 289, + 327, + 302, + 338 + ], + "score": 0.88, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 324, + 326, + 362 + ], + "score": 1.0, + "content": "Let su", + "type": "text" + }, + { + "bbox": [ + 326, + 324, + 341, + 339 + ], + "score": 0.91, + "content": "\\mathcal { S } _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 324, + 353, + 362 + ], + "score": 1.0, + "content": "behat", + "type": "text" + }, + { + "bbox": [ + 401, + 324, + 420, + 362 + ], + "score": 1.0, + "content": "onaland", + "type": "text" + }, + { + "bbox": [ + 470, + 326, + 484, + 337 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 484, + 324, + 506, + 362 + ], + "score": 1.0, + "content": ". Let. We", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 100, + 337, + 506, + 375 + ], + "spans": [ + { + "bbox": [ + 100, + 345, + 150, + 375 + ], + "score": 1.0, + "content": "1 2use matrix", + "type": "text" + }, + { + "bbox": [ + 107, + 338, + 162, + 353 + ], + "score": 0.93, + "content": "\\{ e _ { 1 } ^ { ( i , j ) } , e _ { 2 } ^ { ( i , j ) } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 353, + 199, + 367 + ], + "score": 0.93, + "content": "S _ { i j } \\in \\mathbb { R } ^ { d \\times 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 345, + 287, + 375 + ], + "score": 1.0, + "content": "to represent subspace", + "type": "text" + }, + { + "bbox": [ + 288, + 355, + 302, + 367 + ], + "score": 0.9, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 340, + 313, + 353 + ], + "score": 0.9, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 345, + 376, + 375 + ], + "score": 1.0, + "content": "1 , which matrix has", + "type": "text" + }, + { + "bbox": [ + 354, + 337, + 400, + 352 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) } = w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 353, + 397, + 367 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 345, + 415, + 375 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 416, + 352, + 437, + 367 + ], + "score": 0.93, + "content": "e _ { 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 338, + 484, + 353 + ], + "score": 0.93, + "content": "\\langle e _ { 2 } ^ { ( i , j ) } , w _ { j } \\rangle > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 345, + 506, + 375 + ], + "score": 1.0, + "content": "as two columns.", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 364, + 481, + 383 + ], + "spans": [ + { + "bbox": [ + 104, + 364, + 143, + 383 + ], + "score": 1.0, + "content": "Also, let", + "type": "text" + }, + { + "bbox": [ + 143, + 367, + 157, + 380 + ], + "score": 0.91, + "content": "S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 364, + 177, + 383 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 178, + 367, + 226, + 379 + ], + "score": 0.92, + "content": "d \\times ( d - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 364, + 461, + 383 + ], + "score": 1.0, + "content": "matrix, whose columns constitute an orthonormal basis of", + "type": "text" + }, + { + "bbox": [ + 461, + 366, + 475, + 380 + ], + "score": 0.92, + "content": "\\begin{array} { r } { S _ { i j } ^ { \\perp } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 364, + 481, + 383 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 106, + 384, + 368, + 401 + ], + "lines": [ + { + "bbox": [ + 103, + 382, + 371, + 403 + ], + "spans": [ + { + "bbox": [ + 103, + 382, + 122, + 403 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 385, + 192, + 401 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } } = S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 382, + 212, + 403 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 213, + 385, + 304, + 402 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { { S } _ { i j } ^ { \\perp } } = I _ { d } - S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 382, + 371, + 403 + ], + "score": 1.0, + "content": ". Then, we have", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17 + }, + { + "type": "interline_equation", + "bbox": [ + 164, + 406, + 446, + 460 + ], + "lines": [ + { + "bbox": [ + 164, + 406, + 446, + 460 + ], + "spans": [ + { + "bbox": [ + 164, + 406, + 446, + 460 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { M _ { i j } = \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } } \\\\ & { \\qquad = ( \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) } \\\\ & { \\qquad = ( \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) } \\end{array}", + "type": "interline_equation", + "image_path": "340c41fbbac062c8faa94d8b1c6bf06f4e1c4685bca091ab595bfc6729217ee2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 164, + 406, + 446, + 424.0 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 164, + 424.0, + 446, + 442.0 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 164, + 442.0, + 446, + 460.0 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 469, + 185, + 480 + ], + "lines": [ + { + "bbox": [ + 106, + 469, + 185, + 482 + ], + "spans": [ + { + "bbox": [ + 106, + 469, + 185, + 482 + ], + "score": 1.0, + "content": "First, we show that", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "interline_equation", + "bbox": [ + 228, + 480, + 381, + 496 + ], + "lines": [ + { + "bbox": [ + 228, + 480, + 381, + 496 + ], + "spans": [ + { + "bbox": [ + 228, + 480, + 381, + 496 + ], + "score": 0.88, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathrm { P r o j } _ { S _ { i j } } I _ { d } = m _ { i j } I _ { d } ,", + "type": "interline_equation", + "image_path": "5b1a53ed098a4933e86c481a09f273c11ca649eb6197a44240f831a9460c924d.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 228, + 480, + 381, + 496 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 497, + 506, + 542 + ], + "lines": [ + { + "bbox": [ + 105, + 496, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 496, + 249, + 512 + ], + "score": 1.0, + "content": "which is equivalent to proving that", + "type": "text" + }, + { + "bbox": [ + 249, + 498, + 363, + 513 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { { S _ { i j } ^ { \\perp } } } M _ { i j } = m _ { i j } \\mathrm { P r o j } _ { { S _ { i j } ^ { \\perp } } } I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 496, + 505, + 512 + ], + "score": 1.0, + "content": ". It’s obvious that the column span", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 512, + 505, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 512, + 117, + 527 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 513, + 163, + 528 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 512, + 260, + 527 + ], + "score": 1.0, + "content": "belongs to the subspace", + "type": "text" + }, + { + "bbox": [ + 261, + 513, + 275, + 527 + ], + "score": 0.91, + "content": "S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 512, + 381, + 527 + ], + "score": 1.0, + "content": ". Actually, the row span of", + "type": "text" + }, + { + "bbox": [ + 381, + 513, + 427, + 528 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 512, + 505, + 527 + ], + "score": 1.0, + "content": "also belongs to the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 525, + 464, + 544 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 145, + 544 + ], + "score": 1.0, + "content": "subspace", + "type": "text" + }, + { + "bbox": [ + 145, + 528, + 159, + 542 + ], + "score": 0.91, + "content": "\\begin{array} { r } { S _ { i j } ^ { \\perp } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 525, + 275, + 544 + ], + "score": 1.0, + "content": ". To show this, let’s consider", + "type": "text" + }, + { + "bbox": [ + 275, + 527, + 347, + 544 + ], + "score": 0.93, + "content": "u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } ) v", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 525, + 377, + 544 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 377, + 528, + 410, + 542 + ], + "score": 0.92, + "content": "u \\in S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 525, + 428, + 544 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 428, + 528, + 459, + 541 + ], + "score": 0.91, + "content": "v \\in S _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 525, + 464, + 544 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24 + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 547, + 395, + 600 + ], + "lines": [ + { + "bbox": [ + 215, + 547, + 395, + 600 + ], + "spans": [ + { + "bbox": [ + 215, + 547, + 395, + 600 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } ) v = u ^ { \\top } ( I _ { d } - S _ { i j } S _ { i j } ^ { \\top } ) M _ { i j } v } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad = ( u ^ { \\top } - u ^ { \\top } S _ { i j } S _ { i j } ^ { \\top } ) M _ { i j } v } \\\\ & { \\quad \\quad \\quad \\quad = u ^ { \\top } M _ { i j } v , } \\end{array}", + "type": "interline_equation", + "image_path": "5edcc434f3e3845868941fade83432bcfc6ea3f527a514d1787efc31d71f1d44.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 215, + 547, + 395, + 564.6666666666666 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 215, + 564.6666666666666, + 395, + 582.3333333333333 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 215, + 582.3333333333333, + 395, + 599.9999999999999 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 604, + 486, + 620 + ], + "lines": [ + { + "bbox": [ + 101, + 598, + 492, + 627 + ], + "spans": [ + { + "bbox": [ + 101, + 598, + 246, + 627 + ], + "score": 1.0, + "content": "where the last equality holds since", + "type": "text" + }, + { + "bbox": [ + 246, + 606, + 279, + 621 + ], + "score": 0.94, + "content": "u \\in S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 598, + 345, + 627 + ], + "score": 1.0, + "content": "is orthogonal to", + "type": "text" + }, + { + "bbox": [ + 345, + 604, + 366, + 619 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 598, + 384, + 627 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 385, + 604, + 406, + 619 + ], + "score": 0.92, + "content": "e _ { 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 598, + 492, + 627 + ], + "score": 1.0, + "content": ". 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\\widetilde { \\phi } _ { i j } | \\cos ( \\widetilde { \\phi } _ { i j } ) | + \\sin ( \\widetilde { \\phi } _ { i j } ) \\bigr ) | | \\widetilde { w } _ { i } | | | \\widetilde { w } _ { j } | | \\sqrt { d } } \\\\ { \\displaystyle \\qquad + \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } ( \\| \\widetilde { w } _ { i } \\| \\| \\widetilde { w } _ { j } \\| + \\| \\widetilde { w } _ { j } \\| \\| \\widetilde { w } _ { i } \\| ) } \\\\ { \\displaystyle \\qquad + \\frac { \\sin ( \\widetilde { \\phi } _ { i j } ) } { \\pi } ( \\| \\widetilde { w } _ { i } \\| \\| \\widetilde { w } _ { j } \\| + \\| \\widetilde { w } _ { j } \\| \\| \\widetilde { w } _ { i } \\| ) } \\\\ { \\displaystyle \\qquad \\le \\frac { \\widetilde { \\tau } ^ { 2 } } { \\pi } ( \\pi + 1 ) \\sqrt { d } + 2 \\widetilde { \\tau } ^ { 2 } + \\frac { 2 \\widetilde { \\tau } ^ { 2 } } { \\pi } . } \\end{array}", + "type": "interline_equation", + "image_path": 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"type": "text" + }, + { + "bbox": [ + 181, + 209, + 254, + 221 + ], + "score": 0.92, + "content": "C = \\mathrm { p o l y } ( \\tau , d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 207, + 298, + 223 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 299, + 206, + 349, + 221 + ], + "score": 0.93, + "content": "\\| \\widetilde { M } _ { i j } \\| \\le C", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 207, + 390, + 223 + ], + "score": 1.0, + "content": "for every", + "type": "text" + }, + { + "bbox": [ + 390, + 209, + 415, + 221 + ], + "score": 0.91, + "content": "i < j", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 207, + 505, + 223 + ], + "score": 1.0, + "content": ". Now applying Lem-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 220, + 250, + 232 + ], + "spans": [ + { + "bbox": [ + 106, + 220, + 132, + 230 + ], + "score": 0.29, + "content": "\\mathrm { \\ m a } 2 1", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 220, + 250, + 232 + ], + "score": 1.0, + "content": "immediately gives the result.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7.5, + "bbox_fs": [ + 105, + 206, + 505, + 232 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 244, + 347, + 256 + ], + "lines": [ + { + "bbox": [ + 105, + 243, + 347, + 257 + ], + "spans": [ + { + "bbox": [ + 105, + 243, + 347, + 257 + ], + "score": 1.0, + "content": "C.2 PROOF OF AUXILIARY LEMMAS FOR SECTION C.1", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 105, + 264, + 475, + 277 + ], + "lines": [ + { + "bbox": [ + 106, + 263, + 475, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 475, + 279 + ], + "score": 1.0, + "content": "We will first prove the characterization for columns in the augmented distinguishing matrix.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10, + "bbox_fs": [ + 106, + 263, + 475, + 279 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 284, + 505, + 319 + ], + "lines": [ + { + "bbox": [ + 105, + 284, + 505, + 298 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 433, + 298 + ], + "score": 1.0, + "content": "Proof of Lemma 19. For simplicity, we start by assuming that every weight vector", + "type": "text" + }, + { + "bbox": [ + 434, + 287, + 445, + 296 + ], + "score": 0.86, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 284, + 505, + 298 + ], + "score": 1.0, + "content": "has unit norm.", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 296, + 505, + 308 + ], + "spans": [ + { + "bbox": [ + 106, + 296, + 391, + 308 + ], + "score": 1.0, + "content": "At the end of the proof we will discuss how to incorporate the norms of", + "type": "text" + }, + { + "bbox": [ + 391, + 297, + 419, + 308 + ], + "score": 0.31, + "content": "w _ { i } , w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 296, + 505, + 308 + ], + "score": 1.0, + "content": ". Also throughout the", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 307, + 385, + 320 + ], + "spans": [ + { + "bbox": [ + 106, + 307, + 249, + 320 + ], + "score": 1.0, + "content": "proof we will abuse notation to use", + "type": "text" + }, + { + "bbox": [ + 249, + 307, + 266, + 319 + ], + "score": 0.91, + "content": "M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 307, + 341, + 320 + ], + "score": 1.0, + "content": "as its matrix form", + "type": "text" + }, + { + "bbox": [ + 341, + 307, + 381, + 319 + ], + "score": 0.71, + "content": "\\mathrm { m a t } ( M _ { i j } )", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 307, + 385, + 320 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12, + "bbox_fs": [ + 105, + 284, + 505, + 320 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 506, + 380 + ], + "lines": [ + { + "bbox": [ + 123, + 324, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 123, + 325, + 137, + 337 + ], + "score": 0.88, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 324, + 257, + 362 + ], + "score": 1.0, + "content": "e subspace spanned by be a set of orthonorma", + "type": "text" + }, + { + "bbox": [ + 258, + 327, + 269, + 336 + ], + "score": 0.85, + "content": "w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 324, + 289, + 362 + ], + "score": 1.0, + "content": "and sis f", + "type": "text" + }, + { + "bbox": [ + 289, + 327, + 302, + 338 + ], + "score": 0.88, + "content": "w _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 324, + 326, + 362 + ], + "score": 1.0, + "content": "Let su", + "type": "text" + }, + { + "bbox": [ + 326, + 324, + 341, + 339 + ], + "score": 0.91, + "content": "\\mathcal { S } _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 324, + 353, + 362 + ], + "score": 1.0, + "content": "behat", + "type": "text" + }, + { + "bbox": [ + 401, + 324, + 420, + 362 + ], + "score": 1.0, + "content": "onaland", + "type": "text" + }, + { + "bbox": [ + 470, + 326, + 484, + 337 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 484, + 324, + 506, + 362 + ], + "score": 1.0, + "content": ". 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We", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 100, + 337, + 506, + 375 + ], + "spans": [ + { + "bbox": [ + 100, + 345, + 150, + 375 + ], + "score": 1.0, + "content": "1 2use matrix", + "type": "text" + }, + { + "bbox": [ + 107, + 338, + 162, + 353 + ], + "score": 0.93, + "content": "\\{ e _ { 1 } ^ { ( i , j ) } , e _ { 2 } ^ { ( i , j ) } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 353, + 199, + 367 + ], + "score": 0.93, + "content": "S _ { i j } \\in \\mathbb { R } ^ { d \\times 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 199, + 345, + 287, + 375 + ], + "score": 1.0, + "content": "to represent subspace", + "type": "text" + }, + { + "bbox": [ + 288, + 355, + 302, + 367 + ], + "score": 0.9, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 340, + 313, + 353 + ], + "score": 0.9, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 345, + 376, + 375 + ], + "score": 1.0, + "content": "1 , which matrix has", + "type": "text" + }, + { + "bbox": [ + 354, + 337, + 400, + 352 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) } = w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 353, + 397, + 367 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 345, + 415, + 375 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 416, + 352, + 437, + 367 + ], + "score": 0.93, + "content": "e _ { 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 338, + 484, + 353 + ], + "score": 0.93, + "content": "\\langle e _ { 2 } ^ { ( i , j ) } , w _ { j } \\rangle > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 345, + 506, + 375 + ], + "score": 1.0, + "content": "as two columns.", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 364, + 481, + 383 + ], + "spans": [ + { + "bbox": [ + 104, + 364, + 143, + 383 + ], + "score": 1.0, + "content": "Also, let", + "type": "text" + }, + { + "bbox": [ + 143, + 367, + 157, + 380 + ], + "score": 0.91, + "content": "S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 364, + 177, + 383 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 178, + 367, + 226, + 379 + ], + "score": 0.92, + "content": "d \\times ( d - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 364, + 461, + 383 + ], + "score": 1.0, + "content": "matrix, whose columns constitute an orthonormal basis of", + "type": "text" + }, + { + "bbox": [ + 461, + 366, + 475, + 380 + ], + "score": 0.92, + "content": "\\begin{array} { r } { S _ { i j } ^ { \\perp } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 364, + 481, + 383 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15, + "bbox_fs": [ + 100, + 324, + 506, + 383 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 384, + 368, + 401 + ], + "lines": [ + { + "bbox": [ + 103, + 382, + 371, + 403 + ], + "spans": [ + { + "bbox": [ + 103, + 382, + 122, + 403 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 385, + 192, + 401 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } } = S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 382, + 212, + 403 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 213, + 385, + 304, + 402 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { { S } _ { i j } ^ { \\perp } } = I _ { d } - S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 382, + 371, + 403 + ], + "score": 1.0, + "content": ". Then, we have", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17, + "bbox_fs": [ + 103, + 382, + 371, + 403 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 164, + 406, + 446, + 460 + ], + "lines": [ + { + "bbox": [ + 164, + 406, + 446, + 460 + ], + "spans": [ + { + "bbox": [ + 164, + 406, + 446, + 460 + ], + "score": 0.94, + "content": "\\begin{array} { r l } & { M _ { i j } = \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } } \\\\ & { \\qquad = ( \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) } \\\\ & { \\qquad = ( \\mathbf { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathbf { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathbf { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) } \\end{array}", + "type": "interline_equation", + "image_path": "340c41fbbac062c8faa94d8b1c6bf06f4e1c4685bca091ab595bfc6729217ee2.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 164, + 406, + 446, + 424.0 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 164, + 424.0, + 446, + 442.0 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 164, + 442.0, + 446, + 460.0 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 469, + 185, + 480 + ], + "lines": [ + { + "bbox": [ + 106, + 469, + 185, + 482 + ], + "spans": [ + { + "bbox": [ + 106, + 469, + 185, + 482 + ], + "score": 1.0, + "content": "First, we show that", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21, + "bbox_fs": [ + 106, + 469, + 185, + 482 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 228, + 480, + 381, + 496 + ], + "lines": [ + { + "bbox": [ + 228, + 480, + 381, + 496 + ], + "spans": [ + { + "bbox": [ + 228, + 480, + 381, + 496 + ], + "score": 0.88, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathrm { P r o j } _ { S _ { i j } } I _ { d } = m _ { i j } I _ { d } ,", + "type": "interline_equation", + "image_path": "5b1a53ed098a4933e86c481a09f273c11ca649eb6197a44240f831a9460c924d.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 228, + 480, + 381, + 496 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 497, + 506, + 542 + ], + "lines": [ + { + "bbox": [ + 105, + 496, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 496, + 249, + 512 + ], + "score": 1.0, + "content": "which is equivalent to proving that", + "type": "text" + }, + { + "bbox": [ + 249, + 498, + 363, + 513 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { { S _ { i j } ^ { \\perp } } } M _ { i j } = m _ { i j } \\mathrm { P r o j } _ { { S _ { i j } ^ { \\perp } } } I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 496, + 505, + 512 + ], + "score": 1.0, + "content": ". It’s obvious that the column span", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 512, + 505, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 512, + 117, + 527 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 513, + 163, + 528 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 512, + 260, + 527 + ], + "score": 1.0, + "content": "belongs to the subspace", + "type": "text" + }, + { + "bbox": [ + 261, + 513, + 275, + 527 + ], + "score": 0.91, + "content": "S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 512, + 381, + 527 + ], + "score": 1.0, + "content": ". Actually, the row span of", + "type": "text" + }, + { + "bbox": [ + 381, + 513, + 427, + 528 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 512, + 505, + 527 + ], + "score": 1.0, + "content": "also belongs to the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 525, + 464, + 544 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 145, + 544 + ], + "score": 1.0, + "content": "subspace", + "type": "text" + }, + { + "bbox": [ + 145, + 528, + 159, + 542 + ], + "score": 0.91, + "content": "\\begin{array} { r } { S _ { i j } ^ { \\perp } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 525, + 275, + 544 + ], + "score": 1.0, + "content": ". To show this, let’s consider", + "type": "text" + }, + { + "bbox": [ + 275, + 527, + 347, + 544 + ], + "score": 0.93, + "content": "u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } ) v", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 525, + 377, + 544 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 377, + 528, + 410, + 542 + ], + "score": 0.92, + "content": "u \\in S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 525, + 428, + 544 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 428, + 528, + 459, + 541 + ], + "score": 0.91, + "content": "v \\in S _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 525, + 464, + 544 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24, + "bbox_fs": [ + 105, + 496, + 505, + 544 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 547, + 395, + 600 + ], + "lines": [ + { + "bbox": [ + 215, + 547, + 395, + 600 + ], + "spans": [ + { + "bbox": [ + 215, + 547, + 395, + 600 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } ) v = u ^ { \\top } ( I _ { d } - S _ { i j } S _ { i j } ^ { \\top } ) M _ { i j } v } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad = ( u ^ { \\top } - u ^ { \\top } S _ { i j } S _ { i j } ^ { \\top } ) M _ { i j } v } \\\\ & { \\quad \\quad \\quad \\quad = u ^ { \\top } M _ { i j } v , } \\end{array}", + "type": "interline_equation", + "image_path": "5edcc434f3e3845868941fade83432bcfc6ea3f527a514d1787efc31d71f1d44.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 215, + 547, + 395, + 564.6666666666666 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 215, + 564.6666666666666, + 395, + 582.3333333333333 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 215, + 582.3333333333333, + 395, + 599.9999999999999 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 604, + 486, + 620 + ], + "lines": [ + { + "bbox": [ + 101, + 598, + 492, + 627 + ], + "spans": [ + { + "bbox": [ + 101, + 598, + 246, + 627 + ], + "score": 1.0, + "content": "where the last equality holds since", + "type": "text" + }, + { + "bbox": [ + 246, + 606, + 279, + 621 + ], + "score": 0.94, + "content": "u \\in S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 598, + 345, + 627 + ], + "score": 1.0, + "content": "is orthogonal to", + "type": "text" + }, + { + "bbox": [ + 345, + 604, + 366, + 619 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 598, + 384, + 627 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 385, + 604, + 406, + 619 + ], + "score": 0.92, + "content": "e _ { 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 598, + 492, + 627 + ], + "score": 1.0, + "content": ". We also know that", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29, + "bbox_fs": [ + 101, + 598, + 492, + 627 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 176, + 623, + 435, + 689 + ], + "lines": [ + { + "bbox": [ + 176, + 623, + 435, + 689 + ], + "spans": [ + { + "bbox": [ + 176, + 623, + 435, + 689 + ], + "score": 0.95, + "content": "\\begin{array} { r l } & { u ^ { \\top } M _ { i j } v = u ^ { \\top } \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x x ^ { \\top } ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] v } \\\\ & { \\qquad = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( u ^ { \\top } x ) ( v ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] } \\\\ & { \\qquad = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( v ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] \\mathbb { E } [ ( u ^ { \\top } x ) ] } \\\\ & { \\qquad = 0 , } \\end{array}", + "type": "interline_equation", + "image_path": "88ca71a64bf9179ff1a83204c88526b19036493378f3491446a5f4e103166480.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 176, + 623, + 435, + 645.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 176, + 645.0, + 435, + 667.0 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 176, + 667.0, + 435, + 689.0 + ], + "spans": [], + "index": 32 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 694, + 506, + 734 + ], + "lines": [ + { + "bbox": [ + 106, + 694, + 505, + 708 + ], + "spans": [ + { + "bbox": [ + 106, + 694, + 268, + 707 + ], + "score": 1.0, + "content": "where the third equality holds because", + "type": "text" + }, + { + "bbox": [ + 268, + 694, + 288, + 705 + ], + "score": 0.89, + "content": "u ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 694, + 373, + 707 + ], + "score": 1.0, + "content": "is independent with", + "type": "text" + }, + { + "bbox": [ + 374, + 694, + 419, + 708 + ], + "score": 0.94, + "content": "w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 694, + 438, + 707 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 439, + 694, + 451, + 705 + ], + "score": 0.87, + "content": "v ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 694, + 505, + 707 + ], + "score": 1.0, + "content": ". Note since", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 107, + 707, + 505, + 721 + ], + "spans": [ + { + "bbox": [ + 107, + 711, + 113, + 718 + ], + "score": 0.65, + "content": "u", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 707, + 192, + 721 + ], + "score": 1.0, + "content": "is orthogonal with", + "type": "text" + }, + { + "bbox": [ + 193, + 710, + 230, + 720 + ], + "score": 0.79, + "content": "w _ { i } , w _ { j } , v", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 707, + 394, + 721 + ], + "score": 1.0, + "content": ", we know for standard Gaussian vector", + "type": "text" + }, + { + "bbox": [ + 394, + 711, + 401, + 718 + ], + "score": 0.77, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 707, + 474, + 721 + ], + "score": 1.0, + "content": ", random variable", + "type": "text" + }, + { + "bbox": [ + 475, + 707, + 494, + 718 + ], + "score": 0.9, + "content": "u ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 707, + 505, + 721 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 719, + 250, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 178, + 733 + ], + "score": 1.0, + "content": "independent with", + "type": "text" + }, + { + "bbox": [ + 178, + 720, + 245, + 734 + ], + "score": 0.91, + "content": "w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x , v ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 719, + 250, + 733 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 34, + "bbox_fs": [ + 105, + 694, + 505, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 141 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 98 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 263, + 97 + ], + "score": 1.0, + "content": "Since the column span and row span of", + "type": "text" + }, + { + "bbox": [ + 263, + 83, + 309, + 98 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 81, + 421, + 97 + ], + "score": 1.0, + "content": "both belong to the subspace", + "type": "text" + }, + { + "bbox": [ + 422, + 82, + 436, + 96 + ], + "score": 0.92, + "content": "S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 81, + 506, + 97 + ], + "score": 1.0, + "content": ", there must exist", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 96, + 505, + 113 + ], + "spans": [ + { + "bbox": [ + 105, + 96, + 114, + 113 + ], + "score": 1.0, + "content": "a", + "type": "text" + }, + { + "bbox": [ + 115, + 97, + 191, + 110 + ], + "score": 0.92, + "content": "( d - 2 ) \\times ( d - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 96, + 222, + 113 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 223, + 98, + 231, + 108 + ], + "score": 0.82, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 96, + 276, + 113 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 276, + 97, + 387, + 113 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } = S _ { i j } ^ { \\perp } C ( S _ { i j } ^ { \\perp } ) ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 96, + 505, + 113 + ], + "score": 1.0, + "content": ". We only need to show this", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 104, + 108, + 505, + 130 + ], + "spans": [ + { + "bbox": [ + 104, + 108, + 135, + 130 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 135, + 114, + 144, + 123 + ], + "score": 0.82, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 108, + 178, + 130 + ], + "score": 1.0, + "content": "must be", + "type": "text" + }, + { + "bbox": [ + 178, + 113, + 214, + 126 + ], + "score": 0.93, + "content": "m _ { i j } I _ { d - 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 108, + 374, + 130 + ], + "score": 1.0, + "content": ". In order to show this, we prove for any", + "type": "text" + }, + { + "bbox": [ + 374, + 112, + 416, + 127 + ], + "score": 0.86, + "content": "u , v \\in S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 108, + 421, + 130 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 422, + 111, + 505, + 129 + ], + "score": 0.92, + "content": "u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } ) v =", + "type": "inline_equation" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 126, + 147, + 142 + ], + "spans": [ + { + "bbox": [ + 106, + 127, + 141, + 141 + ], + "score": 0.91, + "content": "m _ { i j } u ^ { \\top } v", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 126, + 147, + 142 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5 + }, + { + "type": "interline_equation", + "bbox": [ + 164, + 142, + 446, + 245 + ], + "lines": [ + { + "bbox": [ + 164, + 142, + 446, + 245 + ], + "spans": [ + { + "bbox": [ + 164, + 142, + 446, + 245 + ], + "score": 0.95, + "content": "\\begin{array} { r l } { u ^ { \\top } \\big ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } \\big ) v = u ^ { \\top } M _ { i j } v } & { } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\end{array}", + "type": "interline_equation", + "image_path": "f67ef5cd715fdde099f599cbd9957db928557f0a3e002908e250d6d700d5eecb.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 164, + 142, + 446, + 176.33333333333334 + ], + "spans": [], + "index": 4 + }, + { + "bbox": [ + 164, + 176.33333333333334, + 446, + 210.66666666666669 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 164, + 210.66666666666669, + 446, + 245.00000000000003 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 246, + 445, + 275 + ], + "lines": [ + { + "bbox": [ + 105, + 243, + 446, + 262 + ], + "spans": [ + { + "bbox": [ + 105, + 243, + 267, + 262 + ], + "score": 1.0, + "content": "where the fourth equality holds because", + "type": "text" + }, + { + "bbox": [ + 268, + 246, + 309, + 259 + ], + "score": 0.93, + "content": "u ^ { \\top } x , v ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 243, + 396, + 262 + ], + "score": 1.0, + "content": "are independent with", + "type": "text" + }, + { + "bbox": [ + 397, + 246, + 441, + 261 + ], + "score": 0.93, + "content": "w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 243, + 446, + 262 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 263, + 170, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 170, + 277 + ], + "score": 1.0, + "content": "Thus, we know", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7.5 + }, + { + "type": "interline_equation", + "bbox": [ + 171, + 276, + 439, + 313 + ], + "lines": [ + { + "bbox": [ + 171, + 276, + 439, + 313 + ], + "spans": [ + { + "bbox": [ + 171, + 276, + 439, + 313 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { M _ { i j } = ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathrm { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) } \\\\ & { \\qquad = m _ { i j } I _ { d } + ( \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "de4e34655d43ff3f0df44102eba79a3b5104c60e264b957a5e6fa89e57fb05ab.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 171, + 276, + 439, + 288.3333333333333 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 171, + 288.3333333333333, + 439, + 300.66666666666663 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 171, + 300.66666666666663, + 439, + 312.99999999999994 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 319, + 331, + 332 + ], + "lines": [ + { + "bbox": [ + 105, + 319, + 331, + 334 + ], + "spans": [ + { + "bbox": 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Recall that", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 334, + 395, + 350 + ], + "lines": [ + { + "bbox": [ + 215, + 334, + 395, + 350 + ], + "spans": [ + { + "bbox": [ + 215, + 334, + 395, + 350 + ], + "score": 0.92, + "content": "m _ { i j } : = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] .", + "type": "interline_equation", + "image_path": "e9e0cc8d3d13f11f0c4762e3530d7d542d3e22aea304eecd54ece4dc87b9dd18.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 215, + 334, + 395, + 350 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 352, + 505, + 385 + ], + "lines": [ + { + "bbox": [ + 105, + 351, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 351, + 261, + 365 + ], + "score": 1.0, + "content": "Note, we only need to consider input", + "type": "text" + }, + { + "bbox": [ + 261, + 354, + 268, + 362 + ], + "score": 0.79, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 269, + 351, + 338, + 365 + ], + "score": 1.0, + "content": "within subspace", + "type": "text" + }, + { + "bbox": [ + 338, + 352, + 352, + 364 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 351, + 505, + 365 + ], + "score": 1.0, + "content": ", which subspace has dimension two.", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 362, + 504, + 375 + ], + "spans": [ + { + "bbox": [ + 106, + 362, + 423, + 375 + ], + "score": 1.0, + "content": "Using the polar representation of two-dimensional Gaussian random variables (", + "type": "text" + }, + { + "bbox": [ + 423, + 365, + 429, + 372 + ], + "score": 0.7, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 429, + 362, + 497, + 375 + ], + "score": 1.0, + "content": "is the radius and", + "type": "text" + }, + { + "bbox": [ + 498, + 363, + 504, + 372 + ], + "score": 0.81, + "content": "\\theta", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 372, + 195, + 386 + ], + "spans": [ + { + "bbox": [ + 105, + 372, + 195, + 386 + ], + "score": 1.0, + "content": "is the angle), we have", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15 + }, + { + "type": "interline_equation", + "bbox": [ + 104, + 387, + 491, + 418 + ], + "lines": [ + { + "bbox": [ + 104, + 387, + 491, + 418 + ], + "spans": [ + { + "bbox": [ + 104, + 387, + 491, + 418 + ], + "score": 0.93, + "content": "m _ { i j } = \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 3 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { \\pi } { 2 } - \\phi _ { i j } } ^ { \\frac { \\pi } { 2 } } 2 \\cos ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) d \\theta = \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) \\big ) .", + "type": "interline_equation", + "image_path": "699f5b5c0270a081433d9f63084a503d56d984d5fa42d4f681c5d34f00b6d9ce.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 104, + 387, + 491, + 418 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 424, + 508, + 496 + ], + "lines": [ + { + "bbox": [ + 105, + 424, + 506, + 440 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 275, + 440 + ], + "score": 1.0, + "content": "Next, we compute the closed form of", + "type": "text" + }, + { + "bbox": [ + 276, + 426, + 322, + 439 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 424, + 358, + 440 + ], + "score": 1.0, + "content": ". Note", + "type": "text" + }, + { + "bbox": [ + 359, + 426, + 405, + 439 + ], + "score": 0.95, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 424, + 506, + 440 + ], + "score": 1.0, + "content": "is symmetric, because", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 435, + 509, + 457 + ], + "spans": [ + { + "bbox": [ + 106, + 438, + 268, + 454 + ], + "score": 0.9, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j } = M _ { i j } - m _ { i j } I _ { d } + m _ { i j } S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 435, + 288, + 457 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 288, + 440, + 319, + 452 + ], + "score": 0.91, + "content": "M _ { i j } , I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 435, + 337, + 457 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 337, + 439, + 364, + 453 + ], + "score": 0.93, + "content": "S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 435, + 509, + 457 + ], + "score": 1.0, + "content": "are all symmetric. It’s obvious that", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 450, + 504, + 467 + ], + "spans": [ + { + "bbox": [ + 104, + 450, + 187, + 467 + ], + "score": 1.0, + "content": "the column span of", + "type": "text" + }, + { + "bbox": [ + 188, + 453, + 234, + 466 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 450, + 320, + 467 + ], + "score": 1.0, + "content": "belongs to subspace", + "type": "text" + }, + { + "bbox": [ + 320, + 453, + 334, + 464 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 450, + 457, + 467 + ], + "score": 1.0, + "content": ". Combined with the fact that", + "type": "text" + }, + { + "bbox": [ + 457, + 452, + 504, + 466 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 464, + 506, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 464, + 267, + 479 + ], + "score": 1.0, + "content": "is symmetric, we know the row span of", + "type": "text" + }, + { + "bbox": [ + 267, + 465, + 313, + 479 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 464, + 432, + 479 + ], + "score": 1.0, + "content": "also belongs to the subspace", + "type": "text" + }, + { + "bbox": [ + 432, + 465, + 446, + 477 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 464, + 506, + 479 + ], + "score": 1.0, + "content": ". Thus, matrix", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 475, + 406, + 496 + ], + "spans": [ + { + "bbox": [ + 106, + 480, + 153, + 494 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 475, + 337, + 496 + ], + "score": 1.0, + "content": "can be represented as a linear combination of", + "type": "text" + }, + { + "bbox": [ + 337, + 477, + 400, + 493 + ], + "score": 0.92, + "content": "( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 475, + 406, + 496 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 106, + 506, + 524, + 567 + ], + "lines": [ + { + "bbox": [ + 102, + 504, + 525, + 533 + ], + "spans": [ + { + "bbox": [ + 102, + 504, + 111, + 533 + ], + "score": 1.0, + "content": "P", + "type": "text" + }, + { + "bbox": [ + 111, + 511, + 514, + 528 + ], + "score": 0.83, + "content": "\\mathrm { r o j } _ { S _ { i j } } M _ { i j } = c _ { 1 1 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 2 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } )", + "type": "inline_equation", + "image_path": "c74c79d5d520bb2404f1f1cc04c2d4af9d5bcf48251f8613607ddd31713c5356.jpg" + }, + { + "bbox": [ + 514, + 504, + 525, + 533 + ], + "score": 1.0, + "content": "> ,", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 101, + 524, + 510, + 559 + ], + "spans": [ + { + "bbox": [ + 101, + 524, + 134, + 559 + ], + "score": 1.0, + "content": "where coeffic", + "type": "text" + }, + { + "bbox": [ + 134, + 531, + 204, + 547 + ], + "score": 0.88, + "content": "c _ { 1 1 } ^ { ( i , j ) } , c _ { 1 2 } ^ { ( i , j ) } , c _ { 2 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 524, + 223, + 559 + ], + "score": 1.0, + "content": "and r com", + "type": "text" + }, + { + "bbox": [ + 223, + 531, + 244, + 547 + ], + "score": 0.93, + "content": "c _ { 2 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 524, + 386, + 559 + ], + "score": 1.0, + "content": "are four coefficients. 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We only need to show this", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 104, + 108, + 505, + 130 + ], + "spans": [ + { + "bbox": [ + 104, + 108, + 135, + 130 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 135, + 114, + 144, + 123 + ], + "score": 0.82, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 108, + 178, + 130 + ], + "score": 1.0, + "content": "must be", + "type": "text" + }, + { + "bbox": [ + 178, + 113, + 214, + 126 + ], + "score": 0.93, + "content": "m _ { i j } I _ { d - 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 108, + 374, + 130 + ], + "score": 1.0, + "content": ". In order to show this, we prove for any", + "type": "text" + }, + { + "bbox": [ + 374, + 112, + 416, + 127 + ], + "score": 0.86, + "content": "u , v \\in S _ { i j } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 108, + 421, + 130 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 422, + 111, + 505, + 129 + ], + "score": 0.92, + "content": "u ^ { \\top } ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } ) v =", + "type": "inline_equation" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 126, + 147, + 142 + ], + "spans": [ + { + "bbox": [ + 106, + 127, + 141, + 141 + ], + "score": 0.91, + "content": "m _ { i j } u ^ { \\top } v", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 126, + 147, + 142 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5, + "bbox_fs": [ + 104, + 81, + 506, + 142 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 164, + 142, + 446, + 245 + ], + "lines": [ + { + "bbox": [ + 164, + 142, + 446, + 245 + ], + "spans": [ + { + "bbox": [ + 164, + 142, + 446, + 245 + ], + "score": 0.95, + "content": "\\begin{array} { r l } { u ^ { \\top } \\big ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\bot } } M _ { i j } \\big ) v = u ^ { \\top } M _ { i j } v } & { } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & { \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad } \\\\ & \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\quad \\end{array}", + "type": "interline_equation", + "image_path": "f67ef5cd715fdde099f599cbd9957db928557f0a3e002908e250d6d700d5eecb.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 164, + 142, + 446, + 176.33333333333334 + ], + "spans": [], + "index": 4 + }, + { + "bbox": [ + 164, + 176.33333333333334, + 446, + 210.66666666666669 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 164, + 210.66666666666669, + 446, + 245.00000000000003 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 246, + 445, + 275 + ], + "lines": [ + { + "bbox": [ + 105, + 243, + 446, + 262 + ], + "spans": [ + { + "bbox": [ + 105, + 243, + 267, + 262 + ], + "score": 1.0, + "content": "where the fourth equality holds because", + "type": "text" + }, + { + "bbox": [ + 268, + 246, + 309, + 259 + ], + "score": 0.93, + "content": "u ^ { \\top } x , v ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 243, + 396, + 262 + ], + "score": 1.0, + "content": "are independent with", + "type": "text" + }, + { + "bbox": [ + 397, + 246, + 441, + 261 + ], + "score": 0.93, + "content": "w _ { i } ^ { \\top } x , w _ { j } ^ { \\top } x", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 243, + 446, + 262 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 263, + 170, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 170, + 277 + ], + "score": 1.0, + "content": "Thus, we know", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7.5, + "bbox_fs": [ + 105, + 243, + 446, + 277 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 171, + 276, + 439, + 313 + ], + "lines": [ + { + "bbox": [ + 171, + 276, + 439, + 313 + ], + "spans": [ + { + "bbox": [ + 171, + 276, + 439, + 313 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { M _ { i j } = ( \\mathrm { P r o j } _ { S _ { i j } ^ { \\perp } } M _ { i j } + m _ { i j } \\mathrm { P r o j } _ { S _ { i j } } I _ { d } ) + ( \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) } \\\\ & { \\qquad = m _ { i j } I _ { d } + ( \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } ^ { \\top } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "de4e34655d43ff3f0df44102eba79a3b5104c60e264b957a5e6fa89e57fb05ab.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 171, + 276, + 439, + 288.3333333333333 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 171, + 288.3333333333333, + 439, + 300.66666666666663 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 171, + 300.66666666666663, + 439, + 312.99999999999994 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 319, + 331, + 332 + ], + "lines": [ + { + "bbox": [ + 105, + 319, + 331, + 334 + ], + "spans": [ + { + "bbox": [ + 105, + 319, + 263, + 334 + ], + "score": 1.0, + "content": "Let’s now compute the closed form for", + "type": "text" + }, + { + "bbox": [ + 264, + 322, + 280, + 333 + ], + "score": 0.89, + "content": "m _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 319, + 331, + 334 + ], + "score": 1.0, + "content": ". Recall that", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12, + "bbox_fs": [ + 105, + 319, + 331, + 334 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 334, + 395, + 350 + ], + "lines": [ + { + "bbox": [ + 215, + 334, + 395, + 350 + ], + "spans": [ + { + "bbox": [ + 215, + 334, + 395, + 350 + ], + "score": 0.92, + "content": "m _ { i j } : = \\mathbb { E } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] .", + "type": "interline_equation", + "image_path": "e9e0cc8d3d13f11f0c4762e3530d7d542d3e22aea304eecd54ece4dc87b9dd18.jpg" + } + ] + } + ], + "index": 13, + "virtual_lines": [ + { + "bbox": [ + 215, + 334, + 395, + 350 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 352, + 505, + 385 + ], + "lines": [ + { + "bbox": [ + 105, + 351, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 351, + 261, + 365 + ], + "score": 1.0, + "content": "Note, we only need to consider input", + "type": "text" + }, + { + "bbox": [ + 261, + 354, + 268, + 362 + ], + "score": 0.79, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 269, + 351, + 338, + 365 + ], + "score": 1.0, + "content": "within subspace", + "type": "text" + }, + { + "bbox": [ + 338, + 352, + 352, + 364 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 351, + 505, + 365 + ], + "score": 1.0, + "content": ", which subspace has dimension two.", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 362, + 504, + 375 + ], + "spans": [ + { + "bbox": [ + 106, + 362, + 423, + 375 + ], + "score": 1.0, + "content": "Using the polar representation of two-dimensional Gaussian random variables (", + "type": "text" + }, + { + "bbox": [ + 423, + 365, + 429, + 372 + ], + "score": 0.7, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 429, + 362, + 497, + 375 + ], + "score": 1.0, + "content": "is the radius and", + "type": "text" + }, + { + "bbox": [ + 498, + 363, + 504, + 372 + ], + "score": 0.81, + "content": "\\theta", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 372, + 195, + 386 + ], + "spans": [ + { + "bbox": [ + 105, + 372, + 195, + 386 + ], + "score": 1.0, + "content": "is the angle), we have", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15, + "bbox_fs": [ + 105, + 351, + 505, + 386 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 104, + 387, + 491, + 418 + ], + "lines": [ + { + "bbox": [ + 104, + 387, + 491, + 418 + ], + "spans": [ + { + "bbox": [ + 104, + 387, + 491, + 418 + ], + "score": 0.93, + "content": "m _ { i j } = \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 3 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { \\pi } { 2 } - \\phi _ { i j } } ^ { \\frac { \\pi } { 2 } } 2 \\cos ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) d \\theta = \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - \\sin ( \\phi _ { i j } ) \\big ) .", + "type": "interline_equation", + "image_path": "699f5b5c0270a081433d9f63084a503d56d984d5fa42d4f681c5d34f00b6d9ce.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 104, + 387, + 491, + 418 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 424, + 508, + 496 + ], + "lines": [ + { + "bbox": [ + 105, + 424, + 506, + 440 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 275, + 440 + ], + "score": 1.0, + "content": "Next, we compute the closed form of", + "type": "text" + }, + { + "bbox": [ + 276, + 426, + 322, + 439 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 424, + 358, + 440 + ], + "score": 1.0, + "content": ". Note", + "type": "text" + }, + { + "bbox": [ + 359, + 426, + 405, + 439 + ], + "score": 0.95, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 424, + 506, + 440 + ], + "score": 1.0, + "content": "is symmetric, because", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 435, + 509, + 457 + ], + "spans": [ + { + "bbox": [ + 106, + 438, + 268, + 454 + ], + "score": 0.9, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j } = M _ { i j } - m _ { i j } I _ { d } + m _ { i j } S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 435, + 288, + 457 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 288, + 440, + 319, + 452 + ], + "score": 0.91, + "content": "M _ { i j } , I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 435, + 337, + 457 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 337, + 439, + 364, + 453 + ], + "score": 0.93, + "content": "S _ { i j } S _ { i j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 435, + 509, + 457 + ], + "score": 1.0, + "content": "are all symmetric. It’s obvious that", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 450, + 504, + 467 + ], + "spans": [ + { + "bbox": [ + 104, + 450, + 187, + 467 + ], + "score": 1.0, + "content": "the column span of", + "type": "text" + }, + { + "bbox": [ + 188, + 453, + 234, + 466 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 450, + 320, + 467 + ], + "score": 1.0, + "content": "belongs to subspace", + "type": "text" + }, + { + "bbox": [ + 320, + 453, + 334, + 464 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 450, + 457, + 467 + ], + "score": 1.0, + "content": ". Combined with the fact that", + "type": "text" + }, + { + "bbox": [ + 457, + 452, + 504, + 466 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 464, + 506, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 464, + 267, + 479 + ], + "score": 1.0, + "content": "is symmetric, we know the row span of", + "type": "text" + }, + { + "bbox": [ + 267, + 465, + 313, + 479 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 464, + 432, + 479 + ], + "score": 1.0, + "content": "also belongs to the subspace", + "type": "text" + }, + { + "bbox": [ + 432, + 465, + 446, + 477 + ], + "score": 0.89, + "content": "\\boldsymbol { S } _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 464, + 506, + 479 + ], + "score": 1.0, + "content": ". Thus, matrix", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 475, + 406, + 496 + ], + "spans": [ + { + "bbox": [ + 106, + 480, + 153, + 494 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 475, + 337, + 496 + ], + "score": 1.0, + "content": "can be represented as a linear combination of", + "type": "text" + }, + { + "bbox": [ + 337, + 477, + 400, + 493 + ], + "score": 0.92, + "content": "( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 475, + 406, + 496 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 20, + "bbox_fs": [ + 104, + 424, + 509, + 496 + ] + }, + { + "type": "list", + "bbox": [ + 106, + 506, + 524, + 567 + ], + "lines": [ + { + "bbox": [ + 102, + 504, + 525, + 533 + ], + "spans": [ + { + "bbox": [ + 102, + 504, + 111, + 533 + ], + "score": 1.0, + "content": "P", + "type": "text" + }, + { + "bbox": [ + 111, + 511, + 514, + 528 + ], + "score": 0.83, + "content": "\\mathrm { r o j } _ { S _ { i j } } M _ { i j } = c _ { 1 1 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 2 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } )", + "type": "inline_equation", + "image_path": "c74c79d5d520bb2404f1f1cc04c2d4af9d5bcf48251f8613607ddd31713c5356.jpg" + }, + { + "bbox": [ + 514, + 504, + 525, + 533 + ], + "score": 1.0, + "content": "> ,", + "type": "text" + } + ], + "index": 23, + "is_list_start_line": true + }, + { + "bbox": [ + 101, + 524, + 510, + 559 + ], + "spans": [ + { + "bbox": [ + 101, + 524, + 134, + 559 + ], + "score": 1.0, + "content": "where coeffic", + "type": "text" + }, + { + "bbox": [ + 134, + 531, + 204, + 547 + ], + "score": 0.88, + "content": "c _ { 1 1 } ^ { ( i , j ) } , c _ { 1 2 } ^ { ( i , j ) } , c _ { 2 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 524, + 223, + 559 + ], + "score": 1.0, + "content": "and r com", + "type": "text" + }, + { + "bbox": [ + 223, + 531, + 244, + 547 + ], + "score": 0.93, + "content": "c _ { 2 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 524, + 386, + 559 + ], + "score": 1.0, + "content": "are four coefficients. Now, we onion. Similar as the computation for", + "type": "text" + }, + { + "bbox": [ + 403, + 524, + 510, + 559 + ], + "score": 1.0, + "content": "eed to figure out the four, we use polar integration", + "type": "text" + } + ], + "index": 24, + "is_list_start_line": true + }, + { + "bbox": [ + 386, + 547, + 403, + 558 + ], + "spans": [ + { + "bbox": [ + 386, + 547, + 403, + 558 + ], + "score": 0.89, + "content": "m _ { i j }", + "type": "inline_equation" + } + ], + "index": 25, + "is_list_end_line": true + }, + { + "bbox": [ + 106, + 556, + 160, + 568 + ], + "spans": [ + { + "bbox": [ + 106, + 556, + 160, + 568 + ], + "score": 1.0, + "content": "to show that,", + "type": "text" + } + ], + "index": 26, + "is_list_start_line": true, + "is_list_end_line": true + } + ], + "index": 24.5, + "bbox_fs": [ + 101, + 504, + 525, + 568 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 124, + 567, + 489, + 643 + ], + "lines": [ + { + "bbox": [ + 124, + 567, + 489, + 643 + ], + "spans": [ + { + "bbox": [ + 124, + 567, + 489, + 643 + ], + "score": 0.94, + "content": "\\begin{array} { l } { { { \\displaystyle c _ { 1 1 } ^ { ( i , j ) } = \\langle P r o j _ { S _ { i j } } M _ { i j } , ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { T } \\rangle } } } \\\\ { { { \\displaystyle ~ = \\frac { 1 } { 2 \\pi } \\int _ { 0 } ^ { \\infty } r ^ { 5 } \\exp ( - \\frac { r ^ { 2 } } { 2 } ) d r \\int _ { \\frac { \\pi } { 2 } - \\phi _ { i j } } ^ { \\frac { \\pi } { 2 } } \\big ( \\cos ^ { 3 } ( \\theta ) \\cos ( \\theta + \\phi _ { i j } ) + \\cos ( \\theta ) \\cos ^ { 3 } ( \\theta + \\phi _ { i j } ) \\big ) d \\theta } } } \\\\ { { { \\displaystyle ~ = \\frac { 1 } { 4 \\pi } ( 1 2 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 9 \\sin ( \\phi _ { i j } ) - \\sin ( 3 \\phi _ { i j } ) ) , } } } \\end{array}", + "type": "interline_equation", + "image_path": "7027e99745eddefbe6e44660684c229f4e30424bf6e8e02ec94d1e94818a317e.jpg" + } + ] + } + ], + "index": 28, + "virtual_lines": [ + { + "bbox": [ + 124, + 567, + 489, + 592.3333333333334 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 124, + 592.3333333333334, + 489, + 617.6666666666667 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 124, + 617.6666666666667, + 489, + 643.0000000000001 + ], + "spans": [], + "index": 29 + } + ] + }, + { + "type": "text", + "bbox": [ + 102, + 644, + 495, + 660 + ], + "lines": [ + { + "bbox": [ + 102, + 638, + 500, + 667 + ], + "spans": [ + { + "bbox": [ + 102, + 638, + 259, + 667 + ], + "score": 1.0, + "content": "where the first equality holds because", + "type": "text" + }, + { + "bbox": [ + 259, + 644, + 280, + 659 + ], + "score": 0.92, + "content": "e _ { 1 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 638, + 356, + 667 + ], + "score": 1.0, + "content": "is orthogonal with", + "type": "text" + }, + { + "bbox": [ + 357, + 644, + 378, + 659 + ], + "score": 0.92, + "content": "e _ { 2 } ^ { ( i , j ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 378, + 638, + 500, + 667 + ], + "score": 1.0, + "content": ". 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Let", + "type": "text" + }, + { + "bbox": [ + 268, + 174, + 286, + 189 + ], + "score": 0.92, + "content": "M _ { i j } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 170, + 299, + 192 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 299, + 175, + 398, + 190 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j }", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 170, + 507, + 192 + ], + "score": 1.0, + "content": ". Then, according to above", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 187, + 200, + 201 + ], + "spans": [ + { + "bbox": [ + 106, + 187, + 200, + 201 + ], + "score": 1.0, + "content": "computation, we know", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 203, + 514, + 309 + ], + "lines": [ + { + "bbox": [ + 111, + 203, + 514, + 309 + ], + "spans": [ + { + "bbox": [ + 111, + 203, + 514, + 309 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { { \\mathcal { U } _ { i j } ^ { \\prime } = \\mathrm { P r o j } _ { S _ { i j } } M _ { i j } - m _ { i j } S _ { i j } S _ { i j } } } \\\\ & { \\quad = ( c _ { 1 1 } ^ { ( i , j ) } - m _ { i j } ) ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 1 2 } ^ { ( i , j ) } ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + c _ { 2 1 } ^ { ( i , j ) } ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } + ( c _ { 2 2 } ^ { ( i , j ) } - m _ { i j } ) ( } \\\\ & { \\quad = \\frac { 1 } { 4 \\pi } \\big ( 8 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 5 \\sin ( \\phi _ { i j } ) - \\sin ( 3 \\phi _ { i j } ) \\big ) ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } } \\\\ & { \\quad \\quad \\quad + \\frac { 1 } { 4 \\pi } \\big ( - 3 \\sin ( \\phi _ { i j } ) + \\sin ( 3 \\phi _ { i j } ) \\big ) ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } } \\\\ & { \\quad \\quad \\quad + \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\sin ( \\phi _ { i j } ) - \\cos ( \\phi _ { i j } ) \\sin ^ { 2 } ( \\phi _ { i j } ) \\big ) \\big ( ( e _ { 1 } ^ { ( i , j ) } ) ( e _ { 2 } ^ { ( i , j ) } ) ^ { \\top } + ( e _ { 2 } ^ { ( i , j ) } ) ( e _ { 1 } ^ { ( i , j ) } ) ^ { \\top } \\big ) . } \\end{array}", + "type": "interline_equation", + "image_path": "f03940054ed6b7df82e1cf1dfba5590912cba2b1ae9005b18834bbd243099e03.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 111, + 203, + 514, + 238.33333333333334 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 111, + 238.33333333333334, + 514, + 273.6666666666667 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 111, + 273.6666666666667, + 514, + 309.0 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 318, + 504, + 350 + ], + "lines": [ + { + "bbox": [ + 100, + 313, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 100, + 313, + 131, + 342 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 132, + 319, + 177, + 334 + ], + "score": 0.95, + "content": "e _ { 1 } ^ { ( i , j ) } = w _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 177, + 313, + 195, + 342 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 195, + 319, + 327, + 336 + ], + "score": 0.93, + "content": "\\begin{array} { r } { e _ { 2 } ^ { ( i , j ) } = \\frac { 1 } { \\sin ( \\phi _ { i j } ) } w _ { j } - \\cot ( \\phi _ { i j } ) w _ { i } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 320, + 412, + 335 + ], + "score": 1.0, + "content": ", we can also express", + "type": "text" + }, + { + "bbox": [ + 412, + 322, + 430, + 335 + ], + "score": 0.92, + "content": "M _ { i j } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 320, + 506, + 335 + ], + "score": 1.0, + "content": "as a linear combi-", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 333, + 279, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 145, + 352 + ], + "score": 1.0, + "content": "nation of", + "type": "text" + }, + { + "bbox": [ + 145, + 335, + 228, + 350 + ], + "score": 0.93, + "content": "w _ { i } w _ { i } ^ { \\top } , w _ { j } w _ { j } ^ { \\top } , w _ { i } w _ { j } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 333, + 248, + 352 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 248, + 336, + 274, + 349 + ], + "score": 0.9, + "content": "w _ { j } w _ { i } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 274, + 333, + 279, + 352 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9.5 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 354, + 514, + 459 + ], + "lines": [ + { + "bbox": [ + 111, + 354, + 514, + 459 + ], + "spans": [ + { + "bbox": [ + 111, + 354, + 514, + 459 + ], + "score": 0.93, + "content": "\\begin{array} { l } { { \\displaystyle { \\cal U } _ { i j } ^ { \\prime } = \\frac { 1 } { 4 \\pi } \\big ( 8 \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 5 \\sin ( \\phi _ { i j } ) - \\sin ( 3 \\phi _ { i j } ) \\big ) w _ { i } w _ { i } ^ { \\top } } } \\\\ { { \\displaystyle ~ + \\frac { 1 } { 4 \\pi } \\big ( - 3 \\sin ( \\phi _ { i j } ) + \\sin ( 3 \\phi _ { i j } ) \\big ) \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) ^ { \\top } } } \\\\ { { \\displaystyle ~ + \\frac { 1 } { \\pi } \\big ( \\phi _ { i j } \\sin ( \\phi _ { i j } ) - \\cos ( \\phi _ { i j } ) \\sin ^ { 2 } ( \\phi _ { i j } ) \\big ) \\big ( w _ { i } \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) ^ { \\top } + \\big ( \\frac { w _ { j } } { \\sin ( \\phi _ { i j } ) } - \\cot ( \\phi _ { i j } ) w _ { i } \\big ) \\big ) ^ { \\top } ~ , } } \\\\ { { \\displaystyle ~ = \\frac { \\phi _ { i j } } { \\pi } \\big ( w _ { i } w _ { j } ^ { \\top } + w _ { j } w _ { i } ^ { \\top } \\big ) - 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\\frac { \\sin \\big ( \\phi _ { i j } \\big ) } { \\pi } \\big ( w _ { j } w _ { j } ^ { \\top } + w _ { i } w _ { i } ^ { \\top } \\big ) . } } \\end{array}", + "type": "interline_equation", + "image_path": "3abc60439243dcc2709d0f369dedab90a793780bdde9eede4a08c5ea3177f8df.jpg" + } + ] + } + ], + "index": 12, + "virtual_lines": [ + { + "bbox": [ + 111, + 354, + 514, + 389.0 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 111, + 389.0, + 514, + 424.0 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 111, + 424.0, + 514, + 459.0 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 459, + 131, + 470 + ], + "lines": [ + { + "bbox": [ + 105, + 457, + 134, + 474 + ], + "spans": [ + { + "bbox": [ + 105, + 457, + 134, + 474 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14, + "bbox_fs": [ + 105, + 457, + 134, + 474 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 121, + 474, + 491, + 516 + ], + "lines": [ + { + "bbox": [ + 121, + 474, + 491, + 516 + ], + "spans": [ + { + "bbox": [ + 121, + 474, + 491, + 516 + ], + "score": 0.93, + "content": "\\begin{array} { l } { { { \\displaystyle M _ { i j } = m _ { i j } I _ { d } + M _ { i j } ^ { \\prime } } } } \\\\ { { { \\displaystyle \\quad = \\frac { 1 } { \\pi } ( \\phi _ { i j } \\cos ( \\phi _ { i j } ) - 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The smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 317, + 83, + 325, + 92 + ], + "score": 0.81, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 81, + 433, + 95 + ], + "score": 1.0, + "content": "can be defined as follows:", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "interline_equation", + "bbox": [ + 250, + 99, + 360, + 119 + ], + "lines": [ + { + "bbox": [ + 250, + 99, + 360, + 119 + ], + "spans": [ + { + "bbox": [ + 250, + 99, + 360, + 119 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) : = \\operatorname* { m i n } _ { u : \\| u \\| = 1 } \\| A u \\| .", + "type": "interline_equation", + "image_path": "f6e6fbf5ca2c18f2d02727ced76a990351096d807d6518165d0687d305cbbe44.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 250, + 99, + 360, + 119 + ], + "spans": [], + "index": 1 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 124, + 505, + 158 + ], + "lines": [ + { + "bbox": [ + 106, + 124, + 506, + 140 + ], + "spans": [ + { + "bbox": [ + 106, + 124, + 143, + 140 + ], + "score": 1.0, + "content": "Suppose", + "type": "text" + }, + { + "bbox": [ + 144, + 125, + 250, + 139 + ], + "score": 0.88, + "content": "u ^ { * } \\in \\mathrm { a r g m i n } _ { u : \\| u \\| = 1 } \\| A u \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 124, + 270, + 140 + ], + "score": 1.0, + "content": ". 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Thus,", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5 + }, + { + "type": "interline_equation", + "bbox": [ + 231, + 392, + 379, + 514 + ], + "lines": [ + { + "bbox": [ + 231, + 392, + 379, + 514 + ], + "spans": [ + { + "bbox": [ + 231, + 392, + 379, + 514 + ], + "score": 0.93, + "content": "\\begin{array} { r l r } { { \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\| u _ { k } ^ { * } A _ { k } + \\sum _ { i : i \\neq k } u _ { i } ^ { * } A _ { i } \\| } } \\\\ & { } & { \\quad = | u _ { k } ^ { * } | \\| A _ { k } + \\sum _ { i : i \\neq k } \\frac { u _ { i } ^ { * } } { u _ { k } ^ { * } } A _ { i } \\| } \\\\ & { } & { \\quad \\geq | u _ { k } ^ { * } | \\| ( I _ { d } - \\operatorname* { P r o j } _ { S _ { - k } } ) A _ { k } \\| } \\\\ & { } & { \\quad \\geq | u _ { k } ^ { * } | d ^ { \\prime } ( A ) } \\\\ & { } & { \\quad \\geq \\sqrt { \\frac { d } { 4 m ^ { 2 } C ^ { 2 } + n d } } d ^ { \\prime } ( A ) . } \\end{array}", + "type": "interline_equation", + "image_path": "c7e5e42aeda53f9d25f6285bc6e4dc0311917d77259f958c8900140a41323b03.jpg" + } + ] + } + ], + "index": 17.5, + "virtual_lines": [ + { + "bbox": [ + 231, + 392, + 379, + 453.0 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 231, + 453.0, + 379, + 514.0 + ], + "spans": [], + "index": 18 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 537, + 451, + 550 + ], + "lines": [ + { + "bbox": [ + 106, + 536, + 452, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 536, + 325, + 551 + ], + "score": 1.0, + "content": "Above all, we know that the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 325, + 538, + 334, + 547 + ], + "score": 0.85, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 536, + 452, + 551 + ], + "score": 1.0, + "content": "is lower bounded as follows,", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19 + }, + { + "type": "interline_equation", + "bbox": [ + 192, + 554, + 419, + 582 + ], + "lines": [ + { + "bbox": [ + 192, + 554, + 419, + 582 + ], + "spans": [ + { + "bbox": [ + 192, + 554, + 419, + 582 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\operatorname* { m i n } { \\Bigl ( } { \\sqrt { \\frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \\prime } ( A ) { \\Bigr ) } .", + "type": "interline_equation", + "image_path": "1a6ceb68a4f8e0ac02ac3226f78b57e271472de832fcff928aa5d81aa2719c00.jpg" + } + ] + } + ], + "index": 20, + "virtual_lines": [ + { + "bbox": [ + 192, + 554, + 419, + 582 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 603, + 425, + 616 + ], + "lines": [ + { + "bbox": [ + 105, + 601, + 426, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 601, + 379, + 618 + ], + "score": 1.0, + "content": "Next we give the bound on the angle between two perturbed vectors", + "type": "text" + }, + { + "bbox": [ + 380, + 604, + 391, + 615 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 601, + 409, + 618 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 410, + 604, + 421, + 616 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 601, + 426, + 618 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 106, + 623, + 506, + 669 + ], + "lines": [ + { + "bbox": [ + 105, + 622, + 506, + 637 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 316, + 637 + ], + "score": 1.0, + "content": "Proof of Lemma 22. According to the definition of", + "type": "text" + }, + { + "bbox": [ + 316, + 626, + 322, + 635 + ], + "score": 0.82, + "content": "\\rho", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 622, + 416, + 637 + ], + "score": 1.0, + "content": "-perturbation, we know", + "type": "text" + }, + { + "bbox": [ + 417, + 623, + 506, + 636 + ], + "score": 0.88, + "content": "\\widetilde { w } _ { i } = w _ { i } + \\rho \\varepsilon _ { i } , \\widetilde { w } _ { j } =", + "type": "inline_equation" + } + ], + "index": 22 + }, + { + "bbox": [ + 107, + 634, + 506, + 647 + ], + "spans": [ + { + "bbox": [ + 107, + 636, + 142, + 647 + ], + "score": 0.9, + "content": "w _ { j } + \\rho \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 634, + 173, + 647 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 173, + 636, + 195, + 646 + ], + "score": 0.89, + "content": "\\varepsilon _ { i } , \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 634, + 506, + 647 + ], + "score": 1.0, + "content": "e eare i.i.d. standard Gaussian vectors. First, we show that with high probability,", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 646, + 505, + 658 + ], + "spans": [ + { + "bbox": [ + 106, + 646, + 179, + 658 + ], + "score": 1.0, + "content": "the projection of", + "type": "text" + }, + { + "bbox": [ + 179, + 646, + 190, + 657 + ], + "score": 0.87, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 646, + 322, + 658 + ], + "score": 1.0, + "content": "on the orthogonal subspace of", + "type": "text" + }, + { + "bbox": [ + 322, + 646, + 335, + 658 + ], + "score": 0.9, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 646, + 505, + 658 + ], + "score": 1.0, + "content": "is lower bounded. Denote the subspace", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 657, + 492, + 670 + ], + "spans": [ + { + "bbox": [ + 106, + 657, + 154, + 670 + ], + "score": 1.0, + "content": "spanned by", + "type": "text" + }, + { + "bbox": [ + 154, + 657, + 167, + 669 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 657, + 178, + 670 + ], + "score": 1.0, + "content": "as", + "type": "text" + }, + { + "bbox": [ + 179, + 657, + 195, + 669 + ], + "score": 0.9, + "content": "s _ { \\tilde { w } _ { j } }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 657, + 347, + 670 + ], + "score": 1.0, + "content": ", and denote the subspace spanned by", + "type": "text" + }, + { + "bbox": [ + 347, + 657, + 384, + 669 + ], + "score": 0.93, + "content": "\\{ \\widetilde { w } _ { j } , w _ { i } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 657, + 396, + 670 + ], + "score": 1.0, + "content": "as", + "type": "text" + }, + { + "bbox": [ + 396, + 657, + 427, + 669 + ], + "score": 0.92, + "content": "s _ { \\tilde { w } _ { j } \\cup w _ { i } }", + "type": "inline_equation" + }, + { + "bbox": [ + 427, + 657, + 492, + 670 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23.5 + }, + { + "type": "interline_equation", + "bbox": [ + 224, + 674, + 388, + 715 + ], + "lines": [ + { + "bbox": [ + 224, + 674, + 388, + 715 + ], + "spans": [ + { + "bbox": [ + 224, + 674, + 388, + 715 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } } ^ { \\perp } } \\widetilde { w } _ { i } \\right\\| \\geq \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } ( w _ { i } + \\rho \\varepsilon _ { i } ) \\right\\| } \\\\ & { \\qquad = \\rho \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } \\varepsilon _ { i } \\right\\| } \\end{array}", + "type": "interline_equation", + "image_path": "00151ca82ddde56da92f09cf5f4e2a762b391292f201c84ca260e09416c4883b.jpg" + } + ] + } + ], + "index": 26.5, + "virtual_lines": [ + { + "bbox": [ + 224, + 674, + 388, + 694.5 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 224, + 694.5, + 388, + 715.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 720, + 290, + 734 + ], + "lines": [ + { + "bbox": [ + 104, + 714, + 287, + 738 + ], + "spans": [ + { + "bbox": [ + 104, + 714, + 158, + 738 + ], + "score": 1.0, + "content": "where S ⊥wj i", + "type": "text" + }, + { + "bbox": [ + 150, + 716, + 271, + 736 + ], + "score": 1.0, + "content": "s the orthogonal subspace of", + "type": "text" + }, + { + "bbox": [ + 271, + 722, + 287, + 734 + ], + "score": 0.9, + "content": "S _ { \\widetilde { w } _ { j } }", + "type": "inline_equation" + } + ], + "index": 28 + } + ], + "index": 28 + } + ], + "page_idx": 41, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 106, + 26, + 294, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "42", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 587, + 505, + 598 + ], + "lines": [ + { + "bbox": [ + 496, + 588, + 504, + 599 + ], + "spans": [ + { + "bbox": [ + 496, + 588, + 504, + 599 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 81, + 432, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 433, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 316, + 95 + ], + "score": 1.0, + "content": "Proof of Lemma 21. The smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 317, + 83, + 325, + 92 + ], + "score": 0.81, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 81, + 433, + 95 + ], + "score": 1.0, + "content": "can be defined as follows:", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0, + "bbox_fs": [ + 105, + 81, + 433, + 95 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 250, + 99, + 360, + 119 + ], + "lines": [ + { + "bbox": [ + 250, + 99, + 360, + 119 + ], + "spans": [ + { + "bbox": [ + 250, + 99, + 360, + 119 + ], + "score": 0.92, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) : = \\operatorname* { m i n } _ { u : \\| u \\| = 1 } \\| A u \\| .", + "type": "interline_equation", + "image_path": "f6e6fbf5ca2c18f2d02727ced76a990351096d807d6518165d0687d305cbbe44.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 250, + 99, + 360, + 119 + ], + "spans": [], + "index": 1 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 124, + 505, + 158 + ], + "lines": [ + { + "bbox": [ + 106, + 124, + 506, + 140 + ], + "spans": [ + { + "bbox": [ + 106, + 124, + 143, + 140 + ], + "score": 1.0, + "content": "Suppose", + "type": "text" + }, + { + "bbox": [ + 144, + 125, + 250, + 139 + ], + "score": 0.88, + "content": "u ^ { * } \\in \\mathrm { a r g m i n } _ { u : \\| u \\| = 1 } \\| A u \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 124, + 270, + 140 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 271, + 126, + 282, + 137 + ], + "score": 0.89, + "content": "\\boldsymbol { u } _ { i } ^ { * }", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 124, + 474, + 140 + ], + "score": 1.0, + "content": "be the coordinate corresponding to the column", + "type": "text" + }, + { + "bbox": [ + 475, + 126, + 486, + 136 + ], + "score": 0.88, + "content": "A _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 124, + 506, + 140 + ], + "score": 1.0, + "content": ", for", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 138, + 408, + 159 + ], + "spans": [ + { + "bbox": [ + 106, + 143, + 149, + 154 + ], + "score": 0.91, + "content": "0 \\leq i \\leq n", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 139, + 278, + 159 + ], + "score": 1.0, + "content": ". We consider two cases here. If", + "type": "text" + }, + { + "bbox": [ + 278, + 138, + 349, + 159 + ], + "score": 0.94, + "content": "\\begin{array} { r } { | u _ { 0 } ^ { * } | \\geq \\sqrt { \\frac { 4 n C ^ { 2 } } { 4 n C ^ { 2 } + d } } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 350, + 139, + 408, + 159 + ], + "score": 1.0, + "content": ", then we have", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5, + "bbox_fs": [ + 106, + 124, + 506, + 159 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 210, + 164, + 401, + 328 + ], + "lines": [ + { + "bbox": [ + 210, + 164, + 401, + 328 + ], + "spans": [ + { + "bbox": [ + 210, + 164, + 401, + 328 + ], + "score": 0.94, + "content": "\\begin{array} { r l } { \\sigma _ { \\operatorname* { m i n } } ( A ) = \\left| A u ^ { c } \\right| } & { = } \\\\ & { = \\left\\| A u _ { s } ^ { * } A _ { 0 } + \\sum _ { i \\leq i \\leq n } u _ { i } ^ { * } A _ { i } \\right\\| } \\\\ & { \\geq \\left\\| u _ { s } ^ { * } A _ { 0 } \\right\\| - \\left\\| \\displaystyle \\sum _ { 1 \\leq i \\leq n } u _ { i } ^ { * } A _ { i } \\right\\| } \\\\ & { \\geq \\sqrt { \\displaystyle \\frac { 4 n c ^ { 2 } } { 4 n c ^ { 2 } + d } } \\sqrt { d } - ( \\sum _ { 1 \\leq i \\leq n } | u _ { i } ^ { * } | ) C } \\\\ & { \\geq \\sqrt { \\displaystyle \\frac { 4 n c ^ { 2 } d } { 4 n C ^ { 2 } + d } } - \\sqrt { n } \\sqrt { \\displaystyle \\frac { d } { 4 n C ^ { 2 } + d } } C } \\\\ & { = \\sqrt { \\displaystyle \\frac { n c ^ { 2 } d } { 4 n C ^ { 2 } + d } } , } \\end{array}", + "type": "interline_equation", + "image_path": "657685ea8c9db0f55d81c23487abc9cd3800b97ecc77731e26ea36e6bddb6f84.jpg" + } + ] + } + ], + "index": 8.5, + "virtual_lines": [ + { + "bbox": [ + 210, + 164, + 401, + 180.4 + ], + "spans": [], + "index": 4 + }, + { + "bbox": [ + 210, + 180.4, + 401, + 196.8 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 210, + 196.8, + 401, + 213.20000000000002 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 210, + 213.20000000000002, + 401, + 229.60000000000002 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 210, + 229.60000000000002, + 401, + 246.00000000000003 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 210, + 246.00000000000003, + 401, + 262.40000000000003 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 210, + 262.40000000000003, + 401, + 278.8 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 210, + 278.8, + 401, + 295.2 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 210, + 295.2, + 401, + 311.59999999999997 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 210, + 311.59999999999997, + 401, + 327.99999999999994 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 331, + 345, + 343 + ], + "lines": [ + { + "bbox": [ + 105, + 328, + 346, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 328, + 346, + 347 + ], + "score": 1.0, + "content": "where the third inequality uses Cauchy-Schwarz inequality.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14, + "bbox_fs": [ + 105, + 328, + 346, + 347 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 349, + 506, + 387 + ], + "lines": [ + { + "bbox": [ + 104, + 342, + 510, + 372 + ], + "spans": [ + { + "bbox": [ + 104, + 349, + 116, + 368 + ], + "score": 1.0, + "content": "If", + "type": "text" + }, + { + "bbox": [ + 116, + 348, + 187, + 368 + ], + "score": 0.93, + "content": "\\begin{array} { r } { | u _ { 0 } ^ { * } | < \\sqrt { \\frac { 4 n C ^ { 2 } } { 4 n C ^ { 2 } + d } } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 188, + 342, + 230, + 372 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 231, + 351, + 334, + 367 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\sum _ { 1 \\leq i \\leq n } | u _ { i } ^ { * } | ^ { 2 } \\geq \\frac { d } { 4 n C ^ { 2 } + d } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 342, + 353, + 372 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 354, + 352, + 443, + 367 + ], + "score": 0.89, + "content": "k \\in \\mathrm { a r g m a x } _ { 1 \\leq i \\leq n } | u _ { i } ^ { * } |", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 342, + 510, + 372 + ], + "score": 1.0, + "content": ". We know that", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 107, + 368, + 219, + 388 + ], + "spans": [ + { + "bbox": [ + 107, + 368, + 188, + 388 + ], + "score": 0.94, + "content": "\\begin{array} { r } { | u _ { k } ^ { * } | \\geq \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 369, + 219, + 385 + ], + "score": 1.0, + "content": ". Thus,", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5, + "bbox_fs": [ + 104, + 342, + 510, + 388 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 231, + 392, + 379, + 514 + ], + "lines": [ + { + "bbox": [ + 231, + 392, + 379, + 514 + ], + "spans": [ + { + "bbox": [ + 231, + 392, + 379, + 514 + ], + "score": 0.93, + "content": "\\begin{array} { r l r } { { \\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\| u _ { k } ^ { * } A _ { k } + \\sum _ { i : i \\neq k } u _ { i } ^ { * } A _ { i } \\| } } \\\\ & { } & { \\quad = | u _ { k } ^ { * } | \\| A _ { k } + \\sum _ { i : i \\neq k } \\frac { u _ { i } ^ { * } } { u _ { k } ^ { * } } A _ { i } \\| } \\\\ & { } & { \\quad \\geq | u _ { k } ^ { * } | \\| ( I _ { d } - \\operatorname* { P r o j } _ { S _ { - k } } ) A _ { k } \\| } \\\\ & { } & { \\quad \\geq | u _ { k } ^ { * } | d ^ { \\prime } ( A ) } \\\\ & { } & { \\quad \\geq \\sqrt { \\frac { d } { 4 m ^ { 2 } C ^ { 2 } + n d } } d ^ { \\prime } ( A ) . } \\end{array}", + "type": "interline_equation", + "image_path": "c7e5e42aeda53f9d25f6285bc6e4dc0311917d77259f958c8900140a41323b03.jpg" + } + ] + } + ], + "index": 17.5, + "virtual_lines": [ + { + "bbox": [ + 231, + 392, + 379, + 453.0 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 231, + 453.0, + 379, + 514.0 + ], + "spans": [], + "index": 18 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 537, + 451, + 550 + ], + "lines": [ + { + "bbox": [ + 106, + 536, + 452, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 536, + 325, + 551 + ], + "score": 1.0, + "content": "Above all, we know that the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 325, + 538, + 334, + 547 + ], + "score": 0.85, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 536, + 452, + 551 + ], + "score": 1.0, + "content": "is lower bounded as follows,", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19, + "bbox_fs": [ + 106, + 536, + 452, + 551 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 192, + 554, + 419, + 582 + ], + "lines": [ + { + "bbox": [ + 192, + 554, + 419, + 582 + ], + "spans": [ + { + "bbox": [ + 192, + 554, + 419, + 582 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( A ) \\geq \\operatorname* { m i n } { \\Bigl ( } { \\sqrt { \\frac { n C ^ { 2 } d } { 4 n C ^ { 2 } + d } } } , { \\sqrt { \\frac { d } { 4 n ^ { 2 } C ^ { 2 } + n d } } } d ^ { \\prime } ( A ) { \\Bigr ) } .", + "type": "interline_equation", + "image_path": "1a6ceb68a4f8e0ac02ac3226f78b57e271472de832fcff928aa5d81aa2719c00.jpg" + } + ] + } + ], + "index": 20, + "virtual_lines": [ + { + "bbox": [ + 192, + 554, + 419, + 582 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 603, + 425, + 616 + ], + "lines": [ + { + "bbox": [ + 105, + 601, + 426, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 601, + 379, + 618 + ], + "score": 1.0, + "content": "Next we give the bound on the angle between two perturbed vectors", + "type": "text" + }, + { + "bbox": [ + 380, + 604, + 391, + 615 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 601, + 409, + 618 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 410, + 604, + 421, + 616 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 601, + 426, + 618 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 601, + 426, + 618 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 623, + 506, + 669 + ], + "lines": [ + { + "bbox": [ + 105, + 622, + 506, + 637 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 316, + 637 + ], + "score": 1.0, + "content": "Proof of Lemma 22. According to the definition of", + "type": "text" + }, + { + "bbox": [ + 316, + 626, + 322, + 635 + ], + "score": 0.82, + "content": "\\rho", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 622, + 416, + 637 + ], + "score": 1.0, + "content": "-perturbation, we know", + "type": "text" + }, + { + "bbox": [ + 417, + 623, + 506, + 636 + ], + "score": 0.88, + "content": "\\widetilde { w } _ { i } = w _ { i } + \\rho \\varepsilon _ { i } , \\widetilde { w } _ { j } =", + "type": "inline_equation" + } + ], + "index": 22 + }, + { + "bbox": [ + 107, + 634, + 506, + 647 + ], + "spans": [ + { + "bbox": [ + 107, + 636, + 142, + 647 + ], + "score": 0.9, + "content": "w _ { j } + \\rho \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 634, + 173, + 647 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 173, + 636, + 195, + 646 + ], + "score": 0.89, + "content": "\\varepsilon _ { i } , \\varepsilon _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 634, + 506, + 647 + ], + "score": 1.0, + "content": "e eare i.i.d. standard Gaussian vectors. First, we show that with high probability,", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 646, + 505, + 658 + ], + "spans": [ + { + "bbox": [ + 106, + 646, + 179, + 658 + ], + "score": 1.0, + "content": "the projection of", + "type": "text" + }, + { + "bbox": [ + 179, + 646, + 190, + 657 + ], + "score": 0.87, + "content": "\\widetilde { w } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 646, + 322, + 658 + ], + "score": 1.0, + "content": "on the orthogonal subspace of", + "type": "text" + }, + { + "bbox": [ + 322, + 646, + 335, + 658 + ], + "score": 0.9, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 646, + 505, + 658 + ], + "score": 1.0, + "content": "is lower bounded. Denote the subspace", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 657, + 492, + 670 + ], + "spans": [ + { + "bbox": [ + 106, + 657, + 154, + 670 + ], + "score": 1.0, + "content": "spanned by", + "type": "text" + }, + { + "bbox": [ + 154, + 657, + 167, + 669 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 657, + 178, + 670 + ], + "score": 1.0, + "content": "as", + "type": "text" + }, + { + "bbox": [ + 179, + 657, + 195, + 669 + ], + "score": 0.9, + "content": "s _ { \\tilde { w } _ { j } }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 657, + 347, + 670 + ], + "score": 1.0, + "content": ", and denote the subspace spanned by", + "type": "text" + }, + { + "bbox": [ + 347, + 657, + 384, + 669 + ], + "score": 0.93, + "content": "\\{ \\widetilde { w } _ { j } , w _ { i } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 657, + 396, + 670 + ], + "score": 1.0, + "content": "as", + "type": "text" + }, + { + "bbox": [ + 396, + 657, + 427, + 669 + ], + "score": 0.92, + "content": "s _ { \\tilde { w } _ { j } \\cup w _ { i } }", + "type": "inline_equation" + }, + { + "bbox": [ + 427, + 657, + 492, + 670 + ], + "score": 1.0, + "content": ". Thus, we have", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 622, + 506, + 670 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 224, + 674, + 388, + 715 + ], + "lines": [ + { + "bbox": [ + 224, + 674, + 388, + 715 + ], + "spans": [ + { + "bbox": [ + 224, + 674, + 388, + 715 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } } ^ { \\perp } } \\widetilde { w } _ { i } \\right\\| \\geq \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } ( w _ { i } + \\rho \\varepsilon _ { i } ) \\right\\| } \\\\ & { \\qquad = \\rho \\left\\| \\mathrm { P r o j } _ { { \\cal S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } \\varepsilon _ { i } \\right\\| } \\end{array}", + "type": "interline_equation", + "image_path": "00151ca82ddde56da92f09cf5f4e2a762b391292f201c84ca260e09416c4883b.jpg" + } + ] + } + ], + "index": 26.5, + "virtual_lines": [ + { + "bbox": [ + 224, + 674, + 388, + 694.5 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 224, + 694.5, + 388, + 715.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 720, + 290, + 734 + ], + "lines": [ + { + "bbox": [ + 104, + 714, + 287, + 738 + ], + "spans": [ + { + "bbox": [ + 104, + 714, + 158, + 738 + ], + "score": 1.0, + "content": "where S ⊥wj i", + "type": "text" + }, + { + "bbox": [ + 150, + 716, + 271, + 736 + ], + "score": 1.0, + "content": "s the orthogonal subspace of", + "type": "text" + }, + { + "bbox": [ + 271, + 722, + 287, + 734 + ], + "score": 0.9, + "content": "S _ { \\widetilde { w } _ { j } }", + "type": "inline_equation" + } + ], + "index": 28 + } + ], + "index": 28, + "bbox_fs": [ + 104, + 714, + 287, + 738 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 81, + 506, + 163 + ], + "lines": [ + { + "bbox": [ + 104, + 79, + 504, + 98 + ], + "spans": [ + { + "bbox": [ + 104, + 79, + 195, + 98 + ], + "score": 1.0, + "content": "Fix εj , then S ⊥wj ∪wi", + "type": "text" + }, + { + "bbox": [ + 191, + 81, + 286, + 96 + ], + "score": 1.0, + "content": "is a fixed subspace of", + "type": "text" + }, + { + "bbox": [ + 287, + 82, + 300, + 92 + ], + "score": 0.88, + "content": "\\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 81, + 369, + 96 + ], + "score": 1.0, + "content": "with dimension", + "type": "text" + }, + { + "bbox": [ + 369, + 83, + 394, + 93 + ], + "score": 0.85, + "content": "d - 2", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 81, + 419, + 96 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 419, + 83, + 428, + 93 + ], + "score": 0.8, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 429, + 81, + 451, + 96 + ], + "score": 1.0, + "content": "be a", + "type": "text" + }, + { + "bbox": [ + 452, + 82, + 504, + 95 + ], + "score": 0.92, + "content": "d \\times ( d - 2 )", + "type": "inline_equation" + } + ], + "index": 0 + }, + { + "bbox": [ + 102, + 88, + 510, + 117 + ], + "spans": [ + { + "bbox": [ + 102, + 88, + 425, + 117 + ], + "score": 1.0, + "content": "e matrix, whose columns constitute a set of orthonormal basis for the subspace", + "type": "text" + }, + { + "bbox": [ + 426, + 96, + 457, + 111 + ], + "score": 0.94, + "content": "S _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\bot }", + "type": "inline_equation" + }, + { + "bbox": [ + 457, + 88, + 510, + 117 + ], + "score": 1.0, + "content": ". Thus, it’s", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 106, + 509, + 136 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 196, + 136 + ], + "score": 1.0, + "content": "not hard to check that", + "type": "text" + }, + { + "bbox": [ + 197, + 111, + 277, + 132 + ], + "score": 0.92, + "content": "\\operatorname { P r o j } _ { \\mathcal { S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } \\varepsilon _ { i } \\overset { d } { = } U \\varepsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 106, + 308, + 136 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 308, + 113, + 349, + 125 + ], + "score": 0.91, + "content": "\\varepsilon \\in \\mathbb { R } ^ { d - 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 106, + 509, + 136 + ], + "score": 1.0, + "content": "eis a standard Gaussian vector. Denote", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 131, + 504, + 152 + ], + "spans": [ + { + "bbox": [ + 106, + 132, + 280, + 152 + ], + "score": 0.93, + "content": "Y : = \\| \\mathrm { P r o j } _ { { S _ { \\tilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } } \\varepsilon _ { i } \\| ^ { 2 } \\overset { d } { = } \\| U \\varepsilon \\| ^ { 2 } = \\| \\varepsilon \\| ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 131, + 471, + 152 + ], + "score": 1.0, + "content": ", which is a chi-squared random variable with", + "type": "text" + }, + { + "bbox": [ + 472, + 134, + 504, + 147 + ], + "score": 0.89, + "content": "( d - 2 )", + "type": "inline_equation" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 150, + 469, + 163 + ], + "spans": [ + { + "bbox": [ + 106, + 150, + 469, + 163 + ], + "score": 1.0, + "content": "degrees of freedom. According to the tail bound for chi-squared random variable, we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2 + }, + { + "type": "interline_equation", + "bbox": [ + 204, + 164, + 405, + 189 + ], + "lines": [ + { + "bbox": [ + 204, + 164, + 405, + 189 + ], + "spans": [ + { + "bbox": [ + 204, + 164, + 405, + 189 + ], + "score": 0.9, + "content": "\\operatorname* { P r } [ | \\frac { 1 } { d - 2 } Y - 1 | \\geq t ] \\leq 2 e ^ { \\frac { - ( d - 2 ) t ^ { 2 } } { 8 } } , \\forall t \\in ( 0 , 1 ) .", + "type": "interline_equation", + "image_path": "1e0b6cc54f9742eca0874332630365f5a21938a11f65e88943d9c3b7a9bac735.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 204, + 164, + 405, + 189 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 192, + 384, + 207 + ], + "lines": [ + { + "bbox": [ + 102, + 186, + 380, + 209 + ], + "spans": [ + { + "bbox": [ + 102, + 186, + 122, + 209 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 122, + 193, + 146, + 207 + ], + "score": 0.92, + "content": "\\begin{array} { r } { t = \\frac { 1 } { 2 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 186, + 303, + 209 + ], + "score": 1.0, + "content": ", we know that with probability at least", + "type": "text" + }, + { + "bbox": [ + 304, + 191, + 380, + 207 + ], + "score": 0.9, + "content": "\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) } \\end{array}", + "type": "inline_equation" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "interline_equation", + "bbox": [ + 279, + 209, + 331, + 234 + ], + "lines": [ + { + "bbox": [ + 279, + 209, + 331, + 234 + ], + "spans": [ + { + "bbox": [ + 279, + 209, + 331, + 234 + ], + "score": 0.91, + "content": "Y \\geq { \\frac { d - 2 } { 2 } } .", + "type": "interline_equation", + "image_path": "4831db2d55b3231f52b9d95341a63bc55d681a9b24e958f2a17a73dea3ca618f.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 279, + 209, + 331, + 234 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 237, + 404, + 259 + ], + "lines": [ + { + "bbox": [ + 103, + 236, + 405, + 261 + ], + "spans": [ + { + "bbox": [ + 103, + 236, + 292, + 261 + ], + "score": 1.0, + "content": "Thus, we have kProjS⊥wj weik ≥ ρkProjS⊥wj∪wi ε", + "type": "text" + }, + { + "bbox": [ + 320, + 237, + 405, + 254 + ], + "score": 1.0, + "content": "ρ2(d−2) . Recall that", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 262, + 366, + 282 + ], + "lines": [ + { + "bbox": [ + 244, + 262, + 366, + 282 + ], + "spans": [ + { + "bbox": [ + 244, + 262, + 366, + 282 + ], + "score": 0.82, + "content": "\\begin{array} { r } { \\| \\mathrm { P r o j } _ { { S _ { \\tilde { w } _ { j } } ^ { \\perp } } } \\widetilde { w } _ { i } \\| = \\sin ( \\widetilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| . } \\end{array}", + "type": "interline_equation", + "image_path": "31d8cb2e380a96d1a681b3c4a819303db9055c9305353a0d44bc8cbfa4e1d2d1.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 244, + 262, + 366, + 282 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 285, + 164, + 296 + ], + "lines": [ + { + "bbox": [ + 106, + 284, + 165, + 297 + ], + "spans": [ + { + "bbox": [ + 106, + 284, + 165, + 297 + ], + "score": 1.0, + "content": "We also know", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "interline_equation", + "bbox": [ + 261, + 298, + 350, + 342 + ], + "lines": [ + { + "bbox": [ + 261, + 298, + 350, + 342 + ], + "spans": [ + { + "bbox": [ + 261, + 298, + 350, + 342 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\| \\widetilde { \\boldsymbol { w } } _ { i } \\| = \\| \\boldsymbol { w } _ { i } + \\rho \\varepsilon _ { i } \\| } \\\\ & { \\qquad \\leq \\| \\boldsymbol { w } _ { i } \\| + \\rho \\| \\varepsilon _ { i } \\| } \\\\ & { \\qquad = \\tau + \\rho \\| \\varepsilon _ { i } \\| , } \\end{array}", + "type": "interline_equation", + "image_path": "4eedc08e74a6cb225ddf5d89bf751059193ff53fe332656aa1601ecc5e20bd8c.jpg" + } + ] + } + ], + "index": 11.5, + "virtual_lines": [ + { + "bbox": [ + 261, + 298, + 350, + 320.0 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 261, + 320.0, + 350, + 342.0 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 344, + 505, + 379 + ], + "lines": [ + { + "bbox": [ + 106, + 344, + 505, + 357 + ], + "spans": [ + { + "bbox": [ + 106, + 344, + 253, + 357 + ], + "score": 1.0, + "content": "where the last equality holds since", + "type": "text" + }, + { + "bbox": [ + 254, + 345, + 298, + 357 + ], + "score": 0.93, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 344, + 329, + 357 + ], + "score": 1.0, + "content": ". Note", + "type": "text" + }, + { + "bbox": [ + 330, + 344, + 353, + 357 + ], + "score": 0.92, + "content": "\\| \\varepsilon _ { i } \\| ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 344, + 505, + 357 + ], + "score": 1.0, + "content": "is another chi-squared random vari-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 355, + 505, + 368 + ], + "spans": [ + { + "bbox": [ + 105, + 355, + 149, + 368 + ], + "score": 1.0, + "content": "able with", + "type": "text" + }, + { + "bbox": [ + 149, + 356, + 156, + 365 + ], + "score": 0.76, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 355, + 505, + 368 + ], + "score": 1.0, + "content": "degrees of freedom. Similar as above, we can show that with probability at least", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 365, + 172, + 381 + ], + "spans": [ + { + "bbox": [ + 106, + 366, + 167, + 380 + ], + "score": 0.94, + "content": "\\textstyle 1 - 2 \\exp ( { \\frac { - d } { 3 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 365, + 172, + 381 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14 + }, + { + "type": "interline_equation", + "bbox": [ + 279, + 377, + 333, + 402 + ], + "lines": [ + { + "bbox": [ + 279, + 377, + 333, + 402 + ], + "spans": [ + { + "bbox": [ + 279, + 377, + 333, + 402 + ], + "score": 0.91, + "content": "\\| \\varepsilon _ { i } \\| ^ { 2 } \\leq { \\frac { 3 d } { 2 } } .", + "type": "interline_equation", + "image_path": "2c0709503cf1c9a1043014da933a8ea8d4afcf824a4f7936554c866de5fb2854.jpg" + } + ] + } + ], + "index": 16, + "virtual_lines": [ + { + "bbox": [ + 279, + 377, + 333, + 402 + ], + "spans": [], + "index": 16 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 403, + 445, + 418 + ], + "lines": [ + { + "bbox": [ + 103, + 401, + 444, + 420 + ], + "spans": [ + { + "bbox": [ + 103, + 401, + 311, + 420 + ], + "score": 1.0, + "content": "By union bound, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 311, + 403, + 444, + 419 + ], + "score": 0.81, + "content": "\\begin{array} { r } { 1 - 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Thus, it’s", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 106, + 509, + 136 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 196, + 136 + ], + "score": 1.0, + "content": "not hard to check that", + "type": "text" + }, + { + "bbox": [ + 197, + 111, + 277, + 132 + ], + "score": 0.92, + "content": "\\operatorname { P r o j } _ { \\mathcal { S } _ { \\widetilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } \\varepsilon _ { i } \\overset { d } { = } U \\varepsilon", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 106, + 308, + 136 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 308, + 113, + 349, + 125 + ], + "score": 0.91, + "content": "\\varepsilon \\in \\mathbb { R } ^ { d - 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 106, + 509, + 136 + ], + "score": 1.0, + "content": "eis a standard Gaussian vector. Denote", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 131, + 504, + 152 + ], + "spans": [ + { + "bbox": [ + 106, + 132, + 280, + 152 + ], + "score": 0.93, + "content": "Y : = \\| \\mathrm { P r o j } _ { { S _ { \\tilde { w } _ { j } \\cup w _ { i } } ^ { \\perp } } } \\varepsilon _ { i } \\| ^ { 2 } \\overset { d } { = } \\| U \\varepsilon \\| ^ { 2 } = \\| \\varepsilon \\| ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 131, + 471, + 152 + ], + "score": 1.0, + "content": ", which is a chi-squared random variable with", + "type": "text" + }, + { + "bbox": [ + 472, + 134, + 504, + 147 + ], + "score": 0.89, + "content": "( d - 2 )", + "type": "inline_equation" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 150, + 469, + 163 + ], + "spans": [ + { + "bbox": [ + 106, + 150, + 469, + 163 + ], + "score": 1.0, + "content": "degrees of freedom. According to the tail bound for chi-squared random variable, we have", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2, + "bbox_fs": [ + 102, + 79, + 510, + 163 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 204, + 164, + 405, + 189 + ], + "lines": [ + { + "bbox": [ + 204, + 164, + 405, + 189 + ], + "spans": [ + { + "bbox": [ + 204, + 164, + 405, + 189 + ], + "score": 0.9, + "content": "\\operatorname* { P r } [ | \\frac { 1 } { d - 2 } Y - 1 | \\geq t ] \\leq 2 e ^ { \\frac { - ( d - 2 ) t ^ { 2 } } { 8 } } , \\forall t \\in ( 0 , 1 ) .", + "type": "interline_equation", + "image_path": "1e0b6cc54f9742eca0874332630365f5a21938a11f65e88943d9c3b7a9bac735.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 204, + 164, + 405, + 189 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 192, + 384, + 207 + ], + "lines": [ + { + "bbox": [ + 102, + 186, + 380, + 209 + ], + "spans": [ + { + "bbox": [ + 102, + 186, + 122, + 209 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 122, + 193, + 146, + 207 + ], + "score": 0.92, + "content": "\\begin{array} { r } { t = \\frac { 1 } { 2 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 186, + 303, + 209 + ], + "score": 1.0, + "content": ", we know that with probability at least", + "type": "text" + }, + { + "bbox": [ + 304, + 191, + 380, + 207 + ], + "score": 0.9, + "content": "\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) } \\end{array}", + "type": "inline_equation" + } + ], + "index": 6 + } + ], + "index": 6, + "bbox_fs": [ + 102, + 186, + 380, + 209 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 279, + 209, + 331, + 234 + ], + "lines": [ + { + "bbox": [ + 279, + 209, + 331, + 234 + ], + "spans": [ + { + "bbox": [ + 279, + 209, + 331, + 234 + ], + "score": 0.91, + "content": "Y \\geq { \\frac { d - 2 } { 2 } } .", + "type": "interline_equation", + "image_path": "4831db2d55b3231f52b9d95341a63bc55d681a9b24e958f2a17a73dea3ca618f.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 279, + 209, + 331, + 234 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 237, + 404, + 259 + ], + "lines": [ + { + "bbox": [ + 103, + 236, + 405, + 261 + ], + "spans": [ + { + "bbox": [ + 103, + 236, + 292, + 261 + ], + "score": 1.0, + "content": "Thus, we have kProjS⊥wj weik ≥ ρkProjS⊥wj∪wi ε", + "type": "text" + }, + { + "bbox": [ + 320, + 237, + 405, + 254 + ], + "score": 1.0, + "content": "ρ2(d−2) . Recall that", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8, + "bbox_fs": [ + 103, + 236, + 405, + 261 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 262, + 366, + 282 + ], + "lines": [ + { + "bbox": [ + 244, + 262, + 366, + 282 + ], + "spans": [ + { + "bbox": [ + 244, + 262, + 366, + 282 + ], + "score": 0.82, + "content": "\\begin{array} { r } { \\| \\mathrm { P r o j } _ { { S _ { \\tilde { w } _ { j } } ^ { \\perp } } } \\widetilde { w } _ { i } \\| = \\sin ( \\widetilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| . } \\end{array}", + "type": "interline_equation", + "image_path": "31d8cb2e380a96d1a681b3c4a819303db9055c9305353a0d44bc8cbfa4e1d2d1.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 244, + 262, + 366, + 282 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 285, + 164, + 296 + ], + "lines": [ + { + "bbox": [ + 106, + 284, + 165, + 297 + ], + "spans": [ + { + "bbox": [ + 106, + 284, + 165, + 297 + ], + "score": 1.0, + "content": "We also know", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10, + "bbox_fs": [ + 106, + 284, + 165, + 297 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 261, + 298, + 350, + 342 + ], + "lines": [ + { + "bbox": [ + 261, + 298, + 350, + 342 + ], + "spans": [ + { + "bbox": [ + 261, + 298, + 350, + 342 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\| \\widetilde { \\boldsymbol { w } } _ { i } \\| = \\| \\boldsymbol { w } _ { i } + \\rho \\varepsilon _ { i } \\| } \\\\ & { \\qquad \\leq \\| \\boldsymbol { w } _ { i } \\| + \\rho \\| \\varepsilon _ { i } \\| } \\\\ & { \\qquad = \\tau + \\rho \\| \\varepsilon _ { i } \\| , } \\end{array}", + "type": "interline_equation", + "image_path": "4eedc08e74a6cb225ddf5d89bf751059193ff53fe332656aa1601ecc5e20bd8c.jpg" + } + ] + } + ], + "index": 11.5, + "virtual_lines": [ + { + "bbox": [ + 261, + 298, + 350, + 320.0 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 261, + 320.0, + 350, + 342.0 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 344, + 505, + 379 + ], + "lines": [ + { + "bbox": [ + 106, + 344, + 505, + 357 + ], + "spans": [ + { + "bbox": [ + 106, + 344, + 253, + 357 + ], + "score": 1.0, + "content": "where the last equality holds since", + "type": "text" + }, + { + "bbox": [ + 254, + 345, + 298, + 357 + ], + "score": 0.93, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 344, + 329, + 357 + ], + "score": 1.0, + "content": ". Note", + "type": "text" + }, + { + "bbox": [ + 330, + 344, + 353, + 357 + ], + "score": 0.92, + "content": "\\| \\varepsilon _ { i } \\| ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 344, + 505, + 357 + ], + "score": 1.0, + "content": "is another chi-squared random vari-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 355, + 505, + 368 + ], + "spans": [ + { + "bbox": [ + 105, + 355, + 149, + 368 + ], + "score": 1.0, + "content": "able with", + "type": "text" + }, + { + "bbox": [ + 149, + 356, + 156, + 365 + ], + "score": 0.76, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 355, + 505, + 368 + ], + "score": 1.0, + "content": "degrees of freedom. Similar as above, we can show that with probability at least", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 365, + 172, + 381 + ], + "spans": [ + { + "bbox": [ + 106, + 366, + 167, + 380 + ], + "score": 0.94, + "content": "\\textstyle 1 - 2 \\exp ( { \\frac { - d } { 3 2 } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 365, + 172, + 381 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14, + "bbox_fs": [ + 105, + 344, + 505, + 381 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 279, + 377, + 333, + 402 + ], + "lines": [ + { + "bbox": [ + 279, + 377, + 333, + 402 + ], + "spans": [ + { + "bbox": [ + 279, + 377, + 333, + 402 + ], + "score": 0.91, + "content": "\\| \\varepsilon _ { i } \\| ^ { 2 } \\leq { \\frac { 3 d } { 2 } } .", + "type": "interline_equation", + "image_path": "2c0709503cf1c9a1043014da933a8ea8d4afcf824a4f7936554c866de5fb2854.jpg" + } + ] + } + ], + "index": 16, + "virtual_lines": [ + { + "bbox": [ + 279, + 377, + 333, + 402 + ], + "spans": [], + "index": 16 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 403, + 445, + 418 + ], + "lines": [ + { + "bbox": [ + 103, + 401, + 444, + 420 + ], + "spans": [ + { + "bbox": [ + 103, + 401, + 311, + 420 + ], + "score": 1.0, + "content": "By union bound, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 311, + 403, + 444, + 419 + ], + "score": 0.81, + "content": "\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - d } { 3 2 } ) - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) , } \\end{array}", + "type": "inline_equation" + } + ], + "index": 17 + } + ], + "index": 17, + "bbox_fs": [ + 103, + 401, + 444, + 420 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 245, + 421, + 366, + 477 + ], + "lines": [ + { + "bbox": [ + 245, + 421, + 366, + 477 + ], + "spans": [ + { + "bbox": [ + 245, + 421, + 366, + 477 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\sin ( \\widetilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| \\geq \\sqrt { \\frac { \\rho ^ { 2 } ( d - 2 ) } { 2 } } , } \\\\ { \\| \\widetilde { w } _ { i } \\| \\leq \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } . } \\end{array}", + "type": "interline_equation", + "image_path": "031d8b676a55269b44663eba4b9bec010806cf9d1afa4338788a199d777dc5c5.jpg" + } + ] + } + ], + "index": 18.5, + "virtual_lines": [ + { + "bbox": [ + 245, + 421, + 366, + 449.0 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 245, + 449.0, + 366, + 477.0 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 479, + 503, + 509 + ], + "lines": [ + { + "bbox": [ + 105, + 479, + 506, + 495 + ], + "spans": [ + { + "bbox": [ + 105, + 480, + 223, + 495 + ], + "score": 1.0, + "content": "Combined with the fact that", + "type": "text" + }, + { + "bbox": [ + 223, + 479, + 286, + 494 + ], + "score": 0.94, + "content": "\\widetilde { \\phi } _ { i j } \\geq \\sin ( \\widetilde { \\phi } _ { i j } )", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 480, + 312, + 495 + ], + "score": 1.0, + "content": "when", + "type": "text" + }, + { + "bbox": [ + 313, + 479, + 362, + 494 + ], + "score": 0.93, + "content": "\\widetilde { \\phi } _ { i j } \\in [ 0 , \\pi ]", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 480, + 506, + 495 + ], + "score": 1.0, + "content": ", we know with probability at least", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 493, + 238, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 493, + 238, + 509 + ], + "score": 0.9, + "content": "\\begin{array} { r } { 1 - 2 \\exp ( \\frac { - d } { 3 2 } ) - 2 \\exp ( \\frac { - ( d - 2 ) } { 3 2 } ) } \\end{array}", + "type": "inline_equation" + } + ], + "index": 21 + } + ], + "index": 20.5, + "bbox_fs": [ + 105, + 479, + 506, + 509 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 261, + 510, + 345, + 634 + ], + "lines": [ + { + "bbox": [ + 261, + 510, + 345, + 634 + ], + "spans": [ + { + "bbox": [ + 261, + 510, + 345, + 634 + ], + "score": 0.85, + "content": "\\begin{array} { r l } & { \\tilde { \\phi } _ { i j } \\geq \\sin ( \\tilde { \\phi } _ { i j } ) } \\\\ & { \\quad = \\frac { \\sin ( \\tilde { \\phi } _ { i j } ) \\| \\widetilde { w } _ { i } \\| } { \\| \\widetilde { w } _ { i } \\| } } \\\\ & { \\quad \\geq \\frac { \\sqrt { \\frac { \\rho ^ { 2 } ( d - 2 ) } { 2 } } } { \\tau + \\sqrt { \\frac { 3 \\rho ^ { 2 } d } { 2 } } } } \\\\ & { \\quad = \\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } } \\zeta } } \\end{array}", + "type": "interline_equation", + "image_path": "a69d9a757c5a87e694575bb881b6f3618304fb8ce287ea60af5d1a5da605a4d8.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 261, + 510, + 345, + 634 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 642, + 504, + 667 + ], + "lines": [ + { + "bbox": [ + 105, + 640, + 505, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 134, + 658 + ], + "score": 1.0, + "content": "Given", + "type": "text" + }, + { + "bbox": [ + 135, + 641, + 203, + 655 + ], + "score": 0.92, + "content": "\\widetilde { W } = W + \\rho E", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 640, + 236, + 658 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 237, + 644, + 246, + 654 + ], + "score": 0.83, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 640, + 505, + 658 + ], + "score": 1.0, + "content": "is an i.i.d. Gaussian matrix, by union bound, we know with", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 653, + 258, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 653, + 183, + 668 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 184, + 654, + 253, + 668 + ], + "score": 0.91, + "content": "\\therefore - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 653, + 258, + 668 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 640, + 505, + 668 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 669, + 374, + 720 + ], + "lines": [ + { + "bbox": [ + 235, + 669, + 374, + 720 + ], + "spans": [ + { + "bbox": [ + 235, + 669, + 374, + 720 + ], + "score": 0.9, + "content": "\\begin{array} { c } { \\displaystyle \\forall i , \\| \\widetilde { w } _ { i } \\| \\leq \\tau + \\sqrt { 3 \\rho ^ { 2 } d / 2 } } \\\\ { \\displaystyle \\forall i < j , \\frac { \\widetilde { \\phi } _ { i j } } { \\pi } \\geq \\frac { \\sqrt { \\rho ^ { 2 } ( d - 2 ) } } { ( \\sqrt { 2 } \\tau + \\sqrt { 3 \\rho ^ { 2 } d } ) \\pi } } \\end{array}", + "type": "interline_equation", + "image_path": "413f4a22e5ffad4577ff5dacf5808ad263939c4bc210b3293fef7b067fcb2e39.jpg" + } + ] + } + ], + "index": 25.5, + "virtual_lines": [ + { + "bbox": [ + 235, + 669, + 374, + 694.5 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 235, + 694.5, + 374, + 720.0 + ], + "spans": [], + "index": 26 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 104, + 505, + 139 + ], + "lines": [ + { + "bbox": [ + 105, + 103, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 103, + 419, + 117 + ], + "score": 1.0, + "content": "In this section, we show that starting from any well-conditioned weight matrix", + "type": "text" + }, + { + "bbox": [ + 419, + 104, + 430, + 114 + ], + "score": 0.72, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 103, + 505, + 117 + ], + "score": 1.0, + "content": ", and any symmet-", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 114, + 505, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 114, + 192, + 128 + ], + "score": 1.0, + "content": "ric input distribution", + "type": "text" + }, + { + "bbox": [ + 193, + 115, + 202, + 125 + ], + "score": 0.8, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 114, + 375, + 128 + ], + "score": 1.0, + "content": ", how to perturb the distribution locally to", + "type": "text" + }, + { + "bbox": [ + 375, + 115, + 387, + 125 + ], + "score": 0.87, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 114, + 505, + 128 + ], + "score": 1.0, + "content": "so that the smallest singular", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 126, + 285, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 141, + 140 + ], + "score": 1.0, + "content": "value of", + "type": "text" + }, + { + "bbox": [ + 141, + 126, + 162, + 137 + ], + "score": 0.91, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 126, + 285, + 140 + ], + "score": 1.0, + "content": "is at least inverse polynomial.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 107, + 144, + 505, + 188 + ], + "lines": [ + { + "bbox": [ + 105, + 144, + 505, + 157 + ], + "spans": [ + { + "bbox": [ + 105, + 144, + 203, + 157 + ], + "score": 1.0, + "content": "Recall the definition of", + "type": "text" + }, + { + "bbox": [ + 203, + 144, + 229, + 156 + ], + "score": 0.94, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 144, + 417, + 157 + ], + "score": 1.0, + "content": "-perturbation: we mix the original distribution", + "type": "text" + }, + { + "bbox": [ + 418, + 145, + 427, + 154 + ], + "score": 0.81, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 144, + 505, + 157 + ], + "score": 1.0, + "content": "with a distribution", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 155, + 506, + 168 + ], + "spans": [ + { + "bbox": [ + 106, + 156, + 122, + 168 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 123, + 155, + 225, + 168 + ], + "score": 1.0, + "content": "which is just a Gaussian", + "type": "text" + }, + { + "bbox": [ + 226, + 155, + 275, + 168 + ], + "score": 0.93, + "content": "\\hat { \\mathcal { N } } ( 0 , Q Q ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 155, + 360, + 168 + ], + "score": 1.0, + "content": ". To create a sample", + "type": "text" + }, + { + "bbox": [ + 361, + 158, + 368, + 165 + ], + "score": 0.79, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 155, + 380, + 168 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 380, + 156, + 392, + 165 + ], + "score": 0.88, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 155, + 464, + 168 + ], + "score": 1.0, + "content": ", with probability", + "type": "text" + }, + { + "bbox": [ + 464, + 156, + 489, + 166 + ], + "score": 0.87, + "content": "1 - \\lambda", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 155, + 506, + 168 + ], + "score": 1.0, + "content": "we", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 166, + 505, + 178 + ], + "spans": [ + { + "bbox": [ + 105, + 167, + 189, + 178 + ], + "score": 1.0, + "content": "draw a sample from", + "type": "text" + }, + { + "bbox": [ + 189, + 167, + 198, + 176 + ], + "score": 0.8, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 167, + 362, + 178 + ], + "score": 1.0, + "content": "; otherwise we draw a standard Gaussian", + "type": "text" + }, + { + "bbox": [ + 363, + 166, + 419, + 178 + ], + "score": 0.93, + "content": "n \\sim \\mathcal N ( 0 , I _ { d } ) ^ { \\cdot }", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 167, + 450, + 178 + ], + "score": 1.0, + "content": "and let", + "type": "text" + }, + { + "bbox": [ + 450, + 167, + 484, + 178 + ], + "score": 0.91, + "content": "x = Q n", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 167, + 505, + 178 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 177, + 299, + 189 + ], + "spans": [ + { + "bbox": [ + 106, + 177, + 299, + 189 + ], + "score": 1.0, + "content": "will prove Theorem 10 which we restate below:", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 4.5 + }, + { + "type": "text", + "bbox": [ + 106, + 192, + 505, + 238 + ], + "lines": [ + { + "bbox": [ + 105, + 192, + 506, + 206 + ], + "spans": [ + { + "bbox": [ + 105, + 192, + 253, + 206 + ], + "score": 1.0, + "content": "Theorem 10. Given weight matrix", + "type": "text" + }, + { + "bbox": [ + 254, + 194, + 266, + 203 + ], + "score": 0.64, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 192, + 289, + 206 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 289, + 193, + 333, + 205 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 192, + 506, + 206 + ], + "score": 1.0, + "content": "for each row vector and symmetric input", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 203, + 506, + 217 + ], + "spans": [ + { + "bbox": [ + 105, + 203, + 155, + 217 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 156, + 205, + 165, + 214 + ], + "score": 0.79, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 203, + 226, + 217 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + }, + { + "bbox": [ + 226, + 204, + 264, + 216 + ], + "score": 0.91, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 203, + 284, + 217 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 284, + 205, + 344, + 216 + ], + "score": 0.89, + "content": "\\sigma _ { \\operatorname* { m i n } } ( W ) \\geq \\rho ,", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 203, + 408, + 217 + ], + "score": 1.0, + "content": ", after applying", + "type": "text" + }, + { + "bbox": [ + 409, + 204, + 435, + 216 + ], + "score": 0.92, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 203, + 506, + 217 + ], + "score": 1.0, + "content": "-perturbations to", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 215, + 505, + 228 + ], + "spans": [ + { + "bbox": [ + 105, + 215, + 242, + 228 + ], + "score": 1.0, + "content": "yield perturbed input distribution", + "type": "text" + }, + { + "bbox": [ + 242, + 216, + 253, + 225 + ], + "score": 0.85, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 215, + 284, + 228 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 285, + 216, + 293, + 226 + ], + "score": 0.82, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 215, + 311, + 228 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 312, + 216, + 335, + 226 + ], + "score": 0.88, + "content": "d \\times d", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 215, + 505, + 228 + ], + "score": 1.0, + "content": "matrix whose entries are i.i.d. Gaussians,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 225, + 419, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 225, + 239, + 240 + ], + "score": 1.0, + "content": "we have with probability at least", + "type": "text" + }, + { + "bbox": [ + 239, + 226, + 309, + 238 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\dot { \\Omega } ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 225, + 406, + 240 + ], + "score": 1.0, + "content": "over the randomness of", + "type": "text" + }, + { + "bbox": [ + 407, + 227, + 415, + 237 + ], + "score": 0.83, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 225, + 419, + 240 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5 + }, + { + "type": "interline_equation", + "bbox": [ + 232, + 245, + 378, + 262 + ], + "lines": [ + { + "bbox": [ + 232, + 245, + 378, + 262 + ], + "spans": [ + { + "bbox": [ + 232, + 245, + 378, + 262 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho , \\lambda ) .", + "type": "interline_equation", + "image_path": "0ef1c8511136fa0ae951e3c2e9e1d3a1be92b7f845de69ea8272e5db99f6e65e.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 232, + 245, + 378, + 262 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 274, + 505, + 321 + ], + "lines": [ + { + "bbox": [ + 106, + 274, + 505, + 287 + ], + "spans": [ + { + "bbox": [ + 106, + 274, + 505, + 287 + ], + "score": 1.0, + "content": "To prove this, let us first take a look at the structure of augmented distinguishing matrix for these", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 285, + 505, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 285, + 179, + 300 + ], + "score": 1.0, + "content": "distributions. Let", + "type": "text" + }, + { + "bbox": [ + 181, + 286, + 252, + 298 + ], + "score": 0.27, + "content": "M ^ { D } , M ^ { D _ { Q } } , M ^ { D ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 285, + 492, + 300 + ], + "score": 1.0, + "content": "be the augmented distinguishing matrices for distributions", + "type": "text" + }, + { + "bbox": [ + 492, + 288, + 501, + 297 + ], + "score": 0.75, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 285, + 505, + 300 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 297, + 505, + 312 + ], + "spans": [ + { + "bbox": [ + 106, + 299, + 122, + 311 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 123, + 297, + 142, + 312 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 142, + 298, + 154, + 309 + ], + "score": 0.86, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 155, + 297, + 237, + 312 + ], + "score": 1.0, + "content": "respectively. Since", + "type": "text" + }, + { + "bbox": [ + 237, + 299, + 249, + 308 + ], + "score": 0.86, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 297, + 315, + 312 + ], + "score": 1.0, + "content": "is a mixture of", + "type": "text" + }, + { + "bbox": [ + 316, + 299, + 325, + 308 + ], + "score": 0.83, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 297, + 344, + 312 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 345, + 299, + 360, + 311 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 297, + 505, + 312 + ], + "score": 1.0, + "content": ", and the augmented distinguishing", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 309, + 384, + 322 + ], + "spans": [ + { + "bbox": [ + 105, + 309, + 384, + 322 + ], + "score": 1.0, + "content": "matrix is defined as expectations over samples, we immediately have", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5 + }, + { + "type": "interline_equation", + "bbox": [ + 240, + 328, + 370, + 344 + ], + "lines": [ + { + "bbox": [ + 240, + 328, + 370, + 344 + ], + "spans": [ + { + "bbox": [ + 240, + 328, + 370, + 344 + ], + "score": 0.91, + "content": "\\boldsymbol { M } ^ { D ^ { \\prime } } = ( 1 - \\lambda ) \\boldsymbol { M } ^ { D } + \\lambda \\boldsymbol { M } ^ { D _ { Q } } .", + "type": "interline_equation", + "image_path": "23e2f5ae3f15717d0f9066b87393febebc7d4ebea87212a7b9e505703c49b606.jpg" + } + ] + } + ], + "index": 16, + "virtual_lines": [ + { + "bbox": [ + 240, + 328, + 370, + 344 + ], + "spans": [], + "index": 16 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 356, + 505, + 404 + ], + "lines": [ + { + "bbox": [ + 105, + 356, + 505, + 371 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 334, + 371 + ], + "score": 1.0, + "content": "Our proof will go in two steps. First we will show that", + "type": "text" + }, + { + "bbox": [ + 335, + 357, + 386, + 370 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 356, + 505, + 371 + ], + "score": 1.0, + "content": "is large. Then we will show", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 369, + 504, + 384 + ], + "spans": [ + { + "bbox": [ + 104, + 369, + 196, + 384 + ], + "score": 1.0, + "content": "that even mixing with", + "type": "text" + }, + { + "bbox": [ + 197, + 370, + 215, + 380 + ], + "score": 0.89, + "content": "M ^ { \\mathcal { D } }", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 369, + 455, + 384 + ], + "score": 1.0, + "content": "will not significantly reduce the smallest singular value, so", + "type": "text" + }, + { + "bbox": [ + 455, + 369, + 504, + 383 + ], + "score": 0.92, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "score": 1.0, + "content": "is also large. In addition to the techniques that we developed in Section C.1, we need two ideas that", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 393, + 445, + 404 + ], + "spans": [ + { + "bbox": [ + 106, + 393, + 445, + 404 + ], + "score": 1.0, + "content": "we call noise domination and subspace decoupling to solve the new challenges here.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18.5 + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 505, + 507 + ], + "lines": [ + { + "bbox": [ + 104, + 417, + 506, + 432 + ], + "spans": [ + { + "bbox": [ + 104, + 417, + 282, + 432 + ], + "score": 1.0, + "content": "Noise Domination First let us focus on", + "type": "text" + }, + { + "bbox": [ + 282, + 417, + 334, + 430 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 417, + 448, + 432 + ], + "score": 1.0, + "content": ". This instance has weight", + "type": "text" + }, + { + "bbox": [ + 449, + 419, + 461, + 429 + ], + "score": 0.67, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 417, + 506, + 432 + ], + "score": 1.0, + "content": "and input", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 104, + 427, + 506, + 443 + ], + "spans": [ + { + "bbox": [ + 104, + 427, + 155, + 443 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 156, + 429, + 205, + 441 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , Q Q ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 427, + 228, + 443 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 229, + 429, + 256, + 439 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 427, + 506, + 443 + ], + "score": 1.0, + "content": "be the augmented distinguishing matrix for an instance with", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 438, + 506, + 453 + ], + "spans": [ + { + "bbox": [ + 104, + 438, + 136, + 453 + ], + "score": 1.0, + "content": "weight", + "type": "text" + }, + { + "bbox": [ + 136, + 441, + 156, + 452 + ], + "score": 0.85, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 438, + 246, + 453 + ], + "score": 1.0, + "content": "and input distribution", + "type": "text" + }, + { + "bbox": [ + 246, + 440, + 283, + 452 + ], + "score": 0.92, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 438, + 418, + 453 + ], + "score": 1.0, + "content": ". Our first observation shows that", + "type": "text" + }, + { + "bbox": [ + 419, + 439, + 442, + 450 + ], + "score": 0.91, + "content": "M ^ { \\mathcal { D } _ { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 438, + 461, + 453 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 462, + 439, + 488, + 451 + ], + "score": 0.9, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 438, + 506, + 453 + ], + "score": 1.0, + "content": "are", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 448, + 506, + 465 + ], + "spans": [ + { + "bbox": [ + 104, + 448, + 401, + 465 + ], + "score": 1.0, + "content": "closely related, and we only need to analyze the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 401, + 451, + 428, + 461 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 448, + 506, + 465 + ], + "score": 1.0, + "content": ". The problem now", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 462, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 105, + 462, + 383, + 475 + ], + "score": 1.0, + "content": "is very similar to what we did in Theorem 9, except that the weight", + "type": "text" + }, + { + "bbox": [ + 384, + 462, + 404, + 474 + ], + "score": 0.86, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 404, + 462, + 505, + 475 + ], + "score": 1.0, + "content": "is not an i.i.d. Gaussian", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 473, + 505, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 473, + 505, + 485 + ], + "score": 1.0, + "content": "matrix. However, we will still be able to use Theorem 9 as a black-box because the amount of noise", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 117, + 497 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 484, + 137, + 496 + ], + "score": 0.84, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "is in some sense dominating the noise in a standard Gaussian. More precisely, we use the", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 495, + 204, + 508 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 204, + 508 + ], + "score": 1.0, + "content": "following simple claim:", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 24.5 + }, + { + "type": "text", + "bbox": [ + 106, + 510, + 505, + 545 + ], + "lines": [ + { + "bbox": [ + 106, + 510, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 510, + 221, + 524 + ], + "score": 1.0, + "content": "Claim 1. Suppose property", + "type": "text" + }, + { + "bbox": [ + 221, + 512, + 231, + 522 + ], + "score": 0.79, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 510, + 271, + 524 + ], + "score": 1.0, + "content": "holds for", + "type": "text" + }, + { + "bbox": [ + 272, + 511, + 309, + 523 + ], + "score": 0.92, + "content": "\\textstyle { \\mathcal { N } } ( \\mu , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 510, + 343, + 524 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 344, + 514, + 351, + 523 + ], + "score": 0.71, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 510, + 425, + 524 + ], + "score": 1.0, + "content": ", and the property", + "type": "text" + }, + { + "bbox": [ + 425, + 512, + 435, + 522 + ], + "score": 0.78, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 510, + 505, + 524 + ], + "score": 1.0, + "content": "is convex (in the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 522, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 149, + 535 + ], + "score": 1.0, + "content": "sense that", + "type": "text" + }, + { + "bbox": [ + 149, + 523, + 167, + 534 + ], + "score": 0.44, + "content": "i f \\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 522, + 505, + 535 + ], + "score": 1.0, + "content": "holds for two distributions it also holds for their mixture), then for any covariance", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 533, + 314, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 135, + 546 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 135, + 534, + 166, + 544 + ], + "score": 0.9, + "content": "\\Sigma \\succeq I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 533, + 206, + 546 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 207, + 534, + 216, + 543 + ], + "score": 0.76, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 533, + 274, + 546 + ], + "score": 1.0, + "content": "also holds for", + "type": "text" + }, + { + "bbox": [ + 274, + 533, + 310, + 545 + ], + "score": 0.93, + "content": "\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 533, + 314, + 546 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30 + }, + { + "type": "text", + "bbox": [ + 106, + 554, + 505, + 589 + ], + "lines": [ + { + "bbox": [ + 105, + 554, + 505, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 505, + 568 + ], + "score": 1.0, + "content": "Intuitively the claim says that if the property holds for a Gaussian distribution with smaller variance", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 104, + 566, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 104, + 566, + 505, + 579 + ], + "score": 1.0, + "content": "regardless of the mean, then it will also hold for a Gaussian distribution with larger variance. The", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 104, + 577, + 194, + 590 + ], + "spans": [ + { + "bbox": [ + 104, + 577, + 194, + 590 + ], + "score": 1.0, + "content": "proof is quite simple:", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 106, + 607, + 505, + 657 + ], + "lines": [ + { + "bbox": [ + 105, + 607, + 506, + 621 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 153, + 621 + ], + "score": 1.0, + "content": "Proof. Let", + "type": "text" + }, + { + "bbox": [ + 153, + 608, + 210, + 619 + ], + "score": 0.91, + "content": "\\Sigma ^ { \\prime } = \\Sigma - I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 211, + 607, + 318, + 621 + ], + "score": 1.0, + "content": ", by assumption we know", + "type": "text" + }, + { + "bbox": [ + 318, + 608, + 329, + 618 + ], + "score": 0.87, + "content": "\\Sigma ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 607, + 506, + 621 + ], + "score": 1.0, + "content": "is still a positive semidefinite matrix. 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To create a sample", + "type": "text" + }, + { + "bbox": [ + 361, + 158, + 368, + 165 + ], + "score": 0.79, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 155, + 380, + 168 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 380, + 156, + 392, + 165 + ], + "score": 0.88, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 155, + 464, + 168 + ], + "score": 1.0, + "content": ", with probability", + "type": "text" + }, + { + "bbox": [ + 464, + 156, + 489, + 166 + ], + "score": 0.87, + "content": "1 - \\lambda", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 155, + 506, + 168 + ], + "score": 1.0, + "content": "we", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 166, + 505, + 178 + ], + "spans": [ + { + "bbox": [ + 105, + 167, + 189, + 178 + ], + "score": 1.0, + "content": "draw a sample from", + "type": "text" + }, + { + "bbox": [ + 189, + 167, + 198, + 176 + ], + "score": 0.8, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 167, + 362, + 178 + ], + "score": 1.0, + "content": "; otherwise we draw a standard Gaussian", + "type": "text" + }, + { + "bbox": [ + 363, + 166, + 419, + 178 + ], + "score": 0.93, + "content": "n \\sim \\mathcal N ( 0 , I _ { d } ) ^ { \\cdot }", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 167, + 450, + 178 + ], + "score": 1.0, + "content": "and let", + "type": "text" + }, + { + "bbox": [ + 450, + 167, + 484, + 178 + ], + "score": 0.91, + "content": "x = Q n", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 167, + 505, + 178 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 177, + 299, + 189 + ], + "spans": [ + { + "bbox": [ + 106, + 177, + 299, + 189 + ], + "score": 1.0, + "content": "will prove Theorem 10 which we restate below:", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 4.5, + "bbox_fs": [ + 105, + 144, + 506, + 189 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 192, + 505, + 238 + ], + "lines": [ + { + "bbox": [ + 105, + 192, + 506, + 206 + ], + "spans": [ + { + "bbox": [ + 105, + 192, + 253, + 206 + ], + "score": 1.0, + "content": "Theorem 10. Given weight matrix", + "type": "text" + }, + { + "bbox": [ + 254, + 194, + 266, + 203 + ], + "score": 0.64, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 192, + 289, + 206 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 289, + 193, + 333, + 205 + ], + "score": 0.9, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 192, + 506, + 206 + ], + "score": 1.0, + "content": "for each row vector and symmetric input", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 203, + 506, + 217 + ], + "spans": [ + { + "bbox": [ + 105, + 203, + 155, + 217 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 156, + 205, + 165, + 214 + ], + "score": 0.79, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 203, + 226, + 217 + ], + "score": 1.0, + "content": ". Suppose that", + "type": "text" + }, + { + "bbox": [ + 226, + 204, + 264, + 216 + ], + "score": 0.91, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 203, + 284, + 217 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 284, + 205, + 344, + 216 + ], + "score": 0.89, + "content": "\\sigma _ { \\operatorname* { m i n } } ( W ) \\geq \\rho ,", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 203, + 408, + 217 + ], + "score": 1.0, + "content": ", after applying", + "type": "text" + }, + { + "bbox": [ + 409, + 204, + 435, + 216 + ], + "score": 0.92, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 203, + 506, + 217 + ], + "score": 1.0, + "content": "-perturbations to", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 215, + 505, + 228 + ], + "spans": [ + { + "bbox": [ + 105, + 215, + 242, + 228 + ], + "score": 1.0, + "content": "yield perturbed input distribution", + "type": "text" + }, + { + "bbox": [ + 242, + 216, + 253, + 225 + ], + "score": 0.85, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 215, + 284, + 228 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 285, + 216, + 293, + 226 + ], + "score": 0.82, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 215, + 311, + 228 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 312, + 216, + 335, + 226 + ], + "score": 0.88, + "content": "d \\times d", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 215, + 505, + 228 + ], + "score": 1.0, + "content": "matrix whose entries are i.i.d. Gaussians,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 225, + 419, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 225, + 239, + 240 + ], + "score": 1.0, + "content": "we have with probability at least", + "type": "text" + }, + { + "bbox": [ + 239, + 226, + 309, + 238 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\dot { \\Omega } ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 225, + 406, + 240 + ], + "score": 1.0, + "content": "over the randomness of", + "type": "text" + }, + { + "bbox": [ + 407, + 227, + 415, + 237 + ], + "score": 0.83, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 225, + 419, + 240 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5, + "bbox_fs": [ + 104, + 192, + 506, + 240 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 232, + 245, + 378, + 262 + ], + "lines": [ + { + "bbox": [ + 232, + 245, + 378, + 262 + ], + "spans": [ + { + "bbox": [ + 232, + 245, + 378, + 262 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq p o l y ( 1 / \\tau , 1 / d , \\rho , \\lambda ) .", + "type": "interline_equation", + "image_path": "0ef1c8511136fa0ae951e3c2e9e1d3a1be92b7f845de69ea8272e5db99f6e65e.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 232, + 245, + 378, + 262 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 274, + 505, + 321 + ], + "lines": [ + { + "bbox": [ + 106, + 274, + 505, + 287 + ], + "spans": [ + { + "bbox": [ + 106, + 274, + 505, + 287 + ], + "score": 1.0, + "content": "To prove this, let us first take a look at the structure of augmented distinguishing matrix for these", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 285, + 505, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 285, + 179, + 300 + ], + "score": 1.0, + "content": "distributions. Let", + "type": "text" + }, + { + "bbox": [ + 181, + 286, + 252, + 298 + ], + "score": 0.27, + "content": "M ^ { D } , M ^ { D _ { Q } } , M ^ { D ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 285, + 492, + 300 + ], + "score": 1.0, + "content": "be the augmented distinguishing matrices for distributions", + "type": "text" + }, + { + "bbox": [ + 492, + 288, + 501, + 297 + ], + "score": 0.75, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 285, + 505, + 300 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 297, + 505, + 312 + ], + "spans": [ + { + "bbox": [ + 106, + 299, + 122, + 311 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 123, + 297, + 142, + 312 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 142, + 298, + 154, + 309 + ], + "score": 0.86, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 155, + 297, + 237, + 312 + ], + "score": 1.0, + "content": "respectively. Since", + "type": "text" + }, + { + "bbox": [ + 237, + 299, + 249, + 308 + ], + "score": 0.86, + "content": "\\mathcal { D } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 297, + 315, + 312 + ], + "score": 1.0, + "content": "is a mixture of", + "type": "text" + }, + { + "bbox": [ + 316, + 299, + 325, + 308 + ], + "score": 0.83, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 297, + 344, + 312 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 345, + 299, + 360, + 311 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 297, + 505, + 312 + ], + "score": 1.0, + "content": ", and the augmented distinguishing", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 309, + 384, + 322 + ], + "spans": [ + { + "bbox": [ + 105, + 309, + 384, + 322 + ], + "score": 1.0, + "content": "matrix is defined as expectations over samples, we immediately have", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5, + "bbox_fs": [ + 105, + 274, + 505, + 322 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 240, + 328, + 370, + 344 + ], + "lines": [ + { + "bbox": [ + 240, + 328, + 370, + 344 + ], + "spans": [ + { + "bbox": [ + 240, + 328, + 370, + 344 + ], + "score": 0.91, + "content": "\\boldsymbol { M } ^ { D ^ { \\prime } } = ( 1 - \\lambda ) \\boldsymbol { M } ^ { D } + \\lambda \\boldsymbol { M } ^ { D _ { Q } } .", + "type": "interline_equation", + "image_path": "23e2f5ae3f15717d0f9066b87393febebc7d4ebea87212a7b9e505703c49b606.jpg" + } + ] + } + ], + "index": 16, + "virtual_lines": [ + { + "bbox": [ + 240, + 328, + 370, + 344 + ], + "spans": [], + "index": 16 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 356, + 505, + 404 + ], + "lines": [ + { + "bbox": [ + 105, + 356, + 505, + 371 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 334, + 371 + ], + "score": 1.0, + "content": "Our proof will go in two steps. First we will show that", + "type": "text" + }, + { + "bbox": [ + 335, + 357, + 386, + 370 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 356, + 505, + 371 + ], + "score": 1.0, + "content": "is large. Then we will show", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 369, + 504, + 384 + ], + "spans": [ + { + "bbox": [ + 104, + 369, + 196, + 384 + ], + "score": 1.0, + "content": "that even mixing with", + "type": "text" + }, + { + "bbox": [ + 197, + 370, + 215, + 380 + ], + "score": 0.89, + "content": "M ^ { \\mathcal { D } }", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 369, + 455, + 384 + ], + "score": 1.0, + "content": "will not significantly reduce the smallest singular value, so", + "type": "text" + }, + { + "bbox": [ + 455, + 369, + 504, + 383 + ], + "score": 0.92, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "score": 1.0, + "content": "is also large. In addition to the techniques that we developed in Section C.1, we need two ideas that", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 393, + 445, + 404 + ], + "spans": [ + { + "bbox": [ + 106, + 393, + 445, + 404 + ], + "score": 1.0, + "content": "we call noise domination and subspace decoupling to solve the new challenges here.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18.5, + "bbox_fs": [ + 104, + 356, + 506, + 404 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 505, + 507 + ], + "lines": [ + { + "bbox": [ + 104, + 417, + 506, + 432 + ], + "spans": [ + { + "bbox": [ + 104, + 417, + 282, + 432 + ], + "score": 1.0, + "content": "Noise Domination First let us focus on", + "type": "text" + }, + { + "bbox": [ + 282, + 417, + 334, + 430 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 417, + 448, + 432 + ], + "score": 1.0, + "content": ". This instance has weight", + "type": "text" + }, + { + "bbox": [ + 449, + 419, + 461, + 429 + ], + "score": 0.67, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 417, + 506, + 432 + ], + "score": 1.0, + "content": "and input", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 104, + 427, + 506, + 443 + ], + "spans": [ + { + "bbox": [ + 104, + 427, + 155, + 443 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 156, + 429, + 205, + 441 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , Q Q ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 427, + 228, + 443 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 229, + 429, + 256, + 439 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 427, + 506, + 443 + ], + "score": 1.0, + "content": "be the augmented distinguishing matrix for an instance with", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 438, + 506, + 453 + ], + "spans": [ + { + "bbox": [ + 104, + 438, + 136, + 453 + ], + "score": 1.0, + "content": "weight", + "type": "text" + }, + { + "bbox": [ + 136, + 441, + 156, + 452 + ], + "score": 0.85, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 438, + 246, + 453 + ], + "score": 1.0, + "content": "and input distribution", + "type": "text" + }, + { + "bbox": [ + 246, + 440, + 283, + 452 + ], + "score": 0.92, + "content": "\\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 438, + 418, + 453 + ], + "score": 1.0, + "content": ". Our first observation shows that", + "type": "text" + }, + { + "bbox": [ + 419, + 439, + 442, + 450 + ], + "score": 0.91, + "content": "M ^ { \\mathcal { D } _ { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 438, + 461, + 453 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 462, + 439, + 488, + 451 + ], + "score": 0.9, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 438, + 506, + 453 + ], + "score": 1.0, + "content": "are", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 448, + 506, + 465 + ], + "spans": [ + { + "bbox": [ + 104, + 448, + 401, + 465 + ], + "score": 1.0, + "content": "closely related, and we only need to analyze the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 401, + 451, + 428, + 461 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 448, + 506, + 465 + ], + "score": 1.0, + "content": ". The problem now", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 462, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 105, + 462, + 383, + 475 + ], + "score": 1.0, + "content": "is very similar to what we did in Theorem 9, except that the weight", + "type": "text" + }, + { + "bbox": [ + 384, + 462, + 404, + 474 + ], + "score": 0.86, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 404, + 462, + 505, + 475 + ], + "score": 1.0, + "content": "is not an i.i.d. Gaussian", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 473, + 505, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 473, + 505, + 485 + ], + "score": 1.0, + "content": "matrix. However, we will still be able to use Theorem 9 as a black-box because the amount of noise", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 117, + 497 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 484, + 137, + 496 + ], + "score": 0.84, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "is in some sense dominating the noise in a standard Gaussian. More precisely, we use the", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 495, + 204, + 508 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 204, + 508 + ], + "score": 1.0, + "content": "following simple claim:", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 24.5, + "bbox_fs": [ + 104, + 417, + 506, + 508 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 510, + 505, + 545 + ], + "lines": [ + { + "bbox": [ + 106, + 510, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 510, + 221, + 524 + ], + "score": 1.0, + "content": "Claim 1. Suppose property", + "type": "text" + }, + { + "bbox": [ + 221, + 512, + 231, + 522 + ], + "score": 0.79, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 510, + 271, + 524 + ], + "score": 1.0, + "content": "holds for", + "type": "text" + }, + { + "bbox": [ + 272, + 511, + 309, + 523 + ], + "score": 0.92, + "content": "\\textstyle { \\mathcal { N } } ( \\mu , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 510, + 343, + 524 + ], + "score": 1.0, + "content": "for any", + "type": "text" + }, + { + "bbox": [ + 344, + 514, + 351, + 523 + ], + "score": 0.71, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 510, + 425, + 524 + ], + "score": 1.0, + "content": ", and the property", + "type": "text" + }, + { + "bbox": [ + 425, + 512, + 435, + 522 + ], + "score": 0.78, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 435, + 510, + 505, + 524 + ], + "score": 1.0, + "content": "is convex (in the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 522, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 149, + 535 + ], + "score": 1.0, + "content": "sense that", + "type": "text" + }, + { + "bbox": [ + 149, + 523, + 167, + 534 + ], + "score": 0.44, + "content": "i f \\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 522, + 505, + 535 + ], + "score": 1.0, + "content": "holds for two distributions it also holds for their mixture), then for any covariance", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 533, + 314, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 135, + 546 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 135, + 534, + 166, + 544 + ], + "score": 0.9, + "content": "\\Sigma \\succeq I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 533, + 206, + 546 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + }, + { + "bbox": [ + 207, + 534, + 216, + 543 + ], + "score": 0.76, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 533, + 274, + 546 + ], + "score": 1.0, + "content": "also holds for", + "type": "text" + }, + { + "bbox": [ + 274, + 533, + 310, + 545 + ], + "score": 0.93, + "content": "\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 533, + 314, + 546 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30, + "bbox_fs": [ + 105, + 510, + 505, + 546 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 554, + 505, + 589 + ], + "lines": [ + { + "bbox": [ + 105, + 554, + 505, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 505, + 568 + ], + "score": 1.0, + "content": "Intuitively the claim says that if the property holds for a Gaussian distribution with smaller variance", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 104, + 566, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 104, + 566, + 505, + 579 + ], + "score": 1.0, + "content": "regardless of the mean, then it will also hold for a Gaussian distribution with larger variance. The", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 104, + 577, + 194, + 590 + ], + "spans": [ + { + "bbox": [ + 104, + 577, + 194, + 590 + ], + "score": 1.0, + "content": "proof is quite simple:", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33, + "bbox_fs": [ + 104, + 554, + 505, + 590 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 607, + 505, + 657 + ], + "lines": [ + { + "bbox": [ + 105, + 607, + 506, + 621 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 153, + 621 + ], + "score": 1.0, + "content": "Proof. Let", + "type": "text" + }, + { + "bbox": [ + 153, + 608, + 210, + 619 + ], + "score": 0.91, + "content": "\\Sigma ^ { \\prime } = \\Sigma - I _ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 211, + 607, + 318, + 621 + ], + "score": 1.0, + "content": ", by assumption we know", + "type": "text" + }, + { + "bbox": [ + 318, + 608, + 329, + 618 + ], + "score": 0.87, + "content": "\\Sigma ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 607, + 506, + 621 + ], + "score": 1.0, + "content": "is still a positive semidefinite matrix. Let", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 107, + 618, + 506, + 632 + ], + "spans": [ + { + "bbox": [ + 107, + 619, + 164, + 631 + ], + "score": 0.83, + "content": "x \\sim { \\mathcal { N } } ( { \\boldsymbol { \\mu } } , { \\boldsymbol { \\Sigma } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 618, + 169, + 632 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 169, + 619, + 233, + 631 + ], + "score": 0.92, + "content": "x ^ { \\prime } \\sim \\mathcal { N } ( \\mu , \\Sigma ^ { \\prime } )", + "type": "inline_equation" + }, + { + "bbox": [ + 233, + 618, + 253, + 632 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 253, + 619, + 310, + 631 + ], + "score": 0.94, + "content": "\\delta \\sim \\mathcal { N } ( 0 , I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 618, + 506, + 632 + ], + "score": 1.0, + "content": ", by property of Gaussians it is easy to see that", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 628, + 507, + 651 + ], + "spans": [ + { + "bbox": [ + 106, + 631, + 155, + 645 + ], + "score": 0.91, + "content": "x \\overset { d } { = } x ^ { \\prime } + \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 155, + 628, + 176, + 651 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 176, + 634, + 206, + 645 + ], + "score": 0.33, + "content": "d _ { x } , d _ { x ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 628, + 225, + 651 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 226, + 634, + 236, + 645 + ], + "score": 0.89, + "content": "d _ { \\delta }", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 628, + 348, + 651 + ], + "score": 1.0, + "content": "be the density function for", + "type": "text" + }, + { + "bbox": [ + 348, + 633, + 377, + 645 + ], + "score": 0.92, + "content": "x , x ^ { \\prime } , \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 378, + 628, + 507, + 651 + ], + "score": 1.0, + "content": "respectively, then we know for", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 645, + 153, + 658 + ], + "spans": [ + { + "bbox": [ + 104, + 645, + 146, + 658 + ], + "score": 1.0, + "content": "any point", + "type": "text" + }, + { + "bbox": [ + 146, + 648, + 153, + 655 + ], + "score": 0.75, + "content": "u", + "type": "inline_equation" + } + ], + "index": 38 + } + ], + "index": 36.5, + "bbox_fs": [ + 104, + 607, + 507, + 658 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 658, + 376, + 672 + ], + "lines": [ + { + "bbox": [ + 235, + 658, + 376, + 672 + ], + "spans": [ + { + "bbox": [ + 235, + 658, + 376, + 672 + ], + "score": 0.91, + "content": "d _ { x } ( u ) = \\mathbb { E } _ { x ^ { \\prime } \\sim \\mathcal { N } ( \\mu , \\Sigma ^ { \\prime } ) } [ d _ { \\delta } ( u - x ^ { \\prime } ) ] .", + "type": "interline_equation", + "image_path": "6e444d76ed3e6af5cc2e03f87a80bf1f3aec2777e6cc16bc42e941c166f4e9fb.jpg" + } + ] + } + ], + "index": 39, + "virtual_lines": [ + { + "bbox": [ + 235, + 658, + 376, + 672 + ], + "spans": [], + "index": 39 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 678, + 504, + 702 + ], + "lines": [ + { + "bbox": [ + 106, + 677, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 140, + 691 + ], + "score": 1.0, + "content": "That is,", + "type": "text" + }, + { + "bbox": [ + 140, + 678, + 176, + 690 + ], + "score": 0.92, + "content": "\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 677, + 239, + 691 + ], + "score": 1.0, + "content": "is a mixture of", + "type": "text" + }, + { + "bbox": [ + 240, + 678, + 276, + 691 + ], + "score": 0.93, + "content": "\\mathcal { N } ( x ^ { \\prime } , I )", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 677, + 343, + 691 + ], + "score": 1.0, + "content": ". Since property", + "type": "text" + }, + { + "bbox": [ + 344, + 680, + 352, + 689 + ], + "score": 0.85, + "content": "\\mathcal { P }", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 677, + 409, + 691 + ], + "score": 1.0, + "content": "is true for all", + "type": "text" + }, + { + "bbox": [ + 410, + 678, + 446, + 691 + ], + "score": 0.93, + "content": "\\mathcal { N } ( x ^ { \\prime } , I )", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 677, + 506, + 691 + ], + "score": 1.0, + "content": ", it is also true", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 687, + 504, + 703 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 120, + 703 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 121, + 690, + 156, + 702 + ], + "score": 0.93, + "content": "\\mathcal { N } ( \\boldsymbol { \\mu } , \\boldsymbol { \\Sigma } )", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 687, + 162, + 703 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 496, + 691, + 504, + 699 + ], + "score": 0.999, + "content": "□", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 40.5, + "bbox_fs": [ + 105, + 677, + 506, + 703 + ] + }, + { + "type": "text", + "bbox": [ + 104, + 719, + 483, + 733 + ], + "lines": [ + { + "bbox": [ + 105, + 719, + 485, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 398, + 734 + ], + "score": 1.0, + "content": "With this claim we can immediately use the result of Theorem 9 to show", + "type": "text" + }, + { + "bbox": [ + 398, + 720, + 450, + 732 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 719, + 485, + 734 + ], + "score": 1.0, + "content": "is large.", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 42, + "bbox_fs": [ + 105, + 719, + 485, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 205 + ], + "lines": [ + { + "bbox": [ + 105, + 80, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 80, + 354, + 96 + ], + "score": 1.0, + "content": "Subspace Decoupling Next we need to consider the mixture", + "type": "text" + }, + { + "bbox": [ + 354, + 81, + 375, + 93 + ], + "score": 0.91, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 80, + 506, + 96 + ], + "score": 1.0, + "content": ". The worry here is that although", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 93, + 504, + 108 + ], + "spans": [ + { + "bbox": [ + 107, + 94, + 158, + 107 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 93, + 250, + 108 + ], + "score": 1.0, + "content": "is large, mixing with", + "type": "text" + }, + { + "bbox": [ + 251, + 95, + 261, + 105 + ], + "score": 0.76, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 93, + 455, + 108 + ], + "score": 1.0, + "content": "might introduce some cancellations and make", + "type": "text" + }, + { + "bbox": [ + 455, + 93, + 504, + 107 + ], + "score": 0.94, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 106, + 506, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 506, + 118 + ], + "score": 1.0, + "content": "much smaller. To prove that this cannot happen with high probability, the key observation is that in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 104, + 114, + 506, + 131 + ], + "spans": [ + { + "bbox": [ + 104, + 114, + 196, + 131 + ], + "score": 1.0, + "content": "the first step, to prove", + "type": "text" + }, + { + "bbox": [ + 196, + 116, + 250, + 129 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } )", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 114, + 422, + 131 + ], + "score": 1.0, + "content": "is large we have only used the property of", + "type": "text" + }, + { + "bbox": [ + 422, + 117, + 442, + 128 + ], + "score": 0.75, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 114, + 482, + 131 + ], + "score": 1.0, + "content": ". If we let", + "type": "text" + }, + { + "bbox": [ + 483, + 116, + 492, + 128 + ], + "score": 0.86, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 492, + 114, + 506, + 131 + ], + "score": 1.0, + "content": "be", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 127, + 505, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 177, + 140 + ], + "score": 1.0, + "content": "the projection of", + "type": "text" + }, + { + "bbox": [ + 177, + 128, + 186, + 139 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 127, + 348, + 140 + ], + "score": 1.0, + "content": "to the orthogonal space of row span of", + "type": "text" + }, + { + "bbox": [ + 349, + 128, + 361, + 138 + ], + "score": 0.63, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 127, + 385, + 140 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 386, + 128, + 395, + 139 + ], + "score": 0.85, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 127, + 505, + 140 + ], + "score": 1.0, + "content": "is still a Gaussian random", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 139, + 506, + 152 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 290, + 152 + ], + "score": 1.0, + "content": "matrix even if we condition on the value of", + "type": "text" + }, + { + "bbox": [ + 290, + 139, + 311, + 151 + ], + "score": 0.75, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 139, + 506, + 152 + ], + "score": 1.0, + "content": "! Therefore in the second step we will use the", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 149, + 505, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 149, + 210, + 163 + ], + "score": 1.0, + "content": "additional randomness in", + "type": "text" + }, + { + "bbox": [ + 211, + 149, + 220, + 162 + ], + "score": 0.87, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 221, + 149, + 505, + 163 + ], + "score": 1.0, + "content": "to show that the cancellation cannot happen. The idea of partitioning", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 160, + 505, + 174 + ], + "spans": [ + { + "bbox": [ + 105, + 160, + 505, + 174 + ], + "score": 1.0, + "content": "the randomness of Gaussian matrices has been widely used in analysis of approximate message", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 104, + 171, + 506, + 185 + ], + "spans": [ + { + "bbox": [ + 104, + 171, + 506, + 185 + ], + "score": 1.0, + "content": "passing algorithms. The actual proof is more involved and we will need to partition the Gaussian", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 181, + 506, + 196 + ], + "spans": [ + { + "bbox": [ + 104, + 181, + 136, + 196 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 136, + 183, + 145, + 194 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 181, + 506, + 196 + ], + "score": 1.0, + "content": "into more parts in order to handle the special column in the augmented distinguishing", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 195, + 141, + 205 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 141, + 205 + ], + "score": 1.0, + "content": "matrix .", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 5 + }, + { + "type": "text", + "bbox": [ + 106, + 210, + 328, + 222 + ], + "lines": [ + { + "bbox": [ + 105, + 209, + 328, + 223 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 328, + 223 + ], + "score": 1.0, + "content": "Now we are ready to give the full proof of Theorem 10", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 105, + 231, + 504, + 254 + ], + "lines": [ + { + "bbox": [ + 105, + 230, + 506, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 473, + 244 + ], + "score": 1.0, + "content": "Proof of Theorem 10. Let us first recall the definition of augmented distinguishing matrix:", + "type": "text" + }, + { + "bbox": [ + 473, + 230, + 494, + 241 + ], + "score": 0.9, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 230, + 506, + 244 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 242, + 355, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 113, + 255 + ], + "score": 1.0, + "content": "a", + "type": "text" + }, + { + "bbox": [ + 113, + 242, + 124, + 252 + ], + "score": 0.86, + "content": "d ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 242, + 138, + 255 + ], + "score": 1.0, + "content": "by", + "type": "text" + }, + { + "bbox": [ + 139, + 243, + 173, + 254 + ], + "score": 0.92, + "content": "( k _ { 2 } + 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 242, + 265, + 255 + ], + "score": 1.0, + "content": "matrix, where the first", + "type": "text" + }, + { + "bbox": [ + 266, + 243, + 276, + 254 + ], + "score": 0.89, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 242, + 355, + 255 + ], + "score": 1.0, + "content": "columns consist of", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12.5 + }, + { + "type": "interline_equation", + "bbox": [ + 187, + 257, + 423, + 273 + ], + "lines": [ + { + "bbox": [ + 187, + 257, + 423, + 273 + ], + "spans": [ + { + "bbox": [ + 187, + 257, + 423, + 273 + ], + "score": 0.9, + "content": "\\begin{array} { r } { M _ { i j } ^ { \\mathcal { D } ^ { \\prime } } : = \\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] , } \\end{array}", + "type": "interline_equation", + "image_path": "274fee240fb0b6ab4ae681e7d58ff82ae797dfd0c0944292f2b6a3fe1ccc7611.jpg" + } + ] + } + ], + "index": 14, + "virtual_lines": [ + { + "bbox": [ + 187, + 257, + 423, + 273 + ], + "spans": [], + "index": 14 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 276, + 505, + 298 + ], + "lines": [ + { + "bbox": [ + 105, + 275, + 506, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 275, + 198, + 289 + ], + "score": 1.0, + "content": "and the last column is", + "type": "text" + }, + { + "bbox": [ + 199, + 276, + 256, + 288 + ], + "score": 0.93, + "content": "\\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } [ x \\otimes x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 275, + 386, + 289 + ], + "score": 1.0, + "content": ". According to the definition of", + "type": "text" + }, + { + "bbox": [ + 386, + 276, + 412, + 288 + ], + "score": 0.91, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 275, + 506, + 289 + ], + "score": 1.0, + "content": "-perturbation, if we let", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 286, + 245, + 300 + ], + "spans": [ + { + "bbox": [ + 106, + 287, + 122, + 299 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 122, + 286, + 135, + 300 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 136, + 286, + 185, + 299 + ], + "score": 0.92, + "content": "\\mathcal { N } ( 0 , Q Q ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 286, + 245, + 300 + ], + "score": 1.0, + "content": ", then we have", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5 + }, + { + "type": "interline_equation", + "bbox": [ + 241, + 300, + 370, + 317 + ], + "lines": [ + { + "bbox": [ + 241, + 300, + 370, + 317 + ], + "spans": [ + { + "bbox": [ + 241, + 300, + 370, + 317 + ], + "score": 0.91, + "content": "M ^ { D ^ { \\prime } } = ( 1 - \\lambda ) M ^ { D } + \\lambda M ^ { D _ { Q } } .", + "type": "interline_equation", + "image_path": "07bf5296eb95c4f0630c5b0afad5ea0e42c54e81e8a8dfc729d136076d3754e3.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 241, + 300, + 370, + 317 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 324, + 505, + 347 + ], + "lines": [ + { + "bbox": [ + 104, + 324, + 506, + 337 + ], + "spans": [ + { + "bbox": [ + 104, + 324, + 269, + 337 + ], + "score": 1.0, + "content": "In the first step, we will try to analyze", + "type": "text" + }, + { + "bbox": [ + 270, + 324, + 293, + 335 + ], + "score": 0.9, + "content": "M ^ { \\mathcal { D } _ { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 324, + 339, + 337 + ], + "score": 1.0, + "content": ". The first", + "type": "text" + }, + { + "bbox": [ + 339, + 326, + 350, + 336 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 324, + 449, + 337 + ], + "score": 1.0, + "content": "columns of this matrix", + "type": "text" + }, + { + "bbox": [ + 449, + 324, + 473, + 335 + ], + "score": 0.9, + "content": "M ^ { \\mathcal { D } _ { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 324, + 506, + 337 + ], + "score": 1.0, + "content": "can be", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 334, + 152, + 349 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 152, + 349 + ], + "score": 1.0, + "content": "written as:", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18.5 + }, + { + "type": "interline_equation", + "bbox": [ + 147, + 347, + 462, + 400 + ], + "lines": [ + { + "bbox": [ + 147, + 347, + 462, + 400 + ], + "spans": [ + { + "bbox": [ + 147, + 347, + 462, + 400 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { M _ { i j } ^ { { D _ { Q } } } = \\mathbb { E } _ { x \\sim \\mathcal { D } _ { Q } } \\left[ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\right] } \\\\ & { \\quad \\quad \\quad = \\mathbb { E } _ { n \\sim \\mathcal { N } ( 0 , { I _ { d } } ) } \\left[ ( w _ { i } ^ { \\top } Q n ) ( w _ { j } ^ { \\top } Q n ) ( Q n \\otimes Q n ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } Q n w _ { j } ^ { \\top } Q n \\leq 0 \\} \\right] } \\\\ & { \\quad \\quad \\quad = Q \\otimes Q \\mathbb { E } _ { n \\sim \\mathcal { N } ( 0 , { I _ { d } } ) } \\left[ ( w _ { i } ^ { \\top } Q n ) ( w _ { j } ^ { \\top } Q n ) ( n \\otimes n ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } Q n w _ { j } ^ { \\top } Q n \\leq 0 \\} \\right] } \\end{array}", + "type": "interline_equation", + "image_path": 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[ + 214, + 428.0, + 396, + 444.0 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 450, + 505, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 450, + 505, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 191, + 462 + ], + "score": 1.0, + "content": "Except for the factor", + "type": "text" + }, + { + "bbox": [ + 191, + 451, + 219, + 461 + ], + "score": 0.9, + "content": "Q \\otimes Q", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 450, + 505, + 462 + ], + "score": 1.0, + "content": ", the remainder of these columns are exactly the same as the augmented", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 461, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 106, + 461, + 385, + 473 + ], + "score": 1.0, + "content": "distinguishing matrix of a network whose first layer weight matrix is", + "type": "text" + }, + { + "bbox": [ + 385, + 461, + 406, + 473 + ], + "score": 0.89, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 461, + 505, + 473 + ], + "score": 1.0, + "content": "and input distribution is", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 469, + 506, + 486 + ], + "spans": [ + { + "bbox": [ + 107, + 472, + 144, + 484 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , \\bar { I } _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 469, + 179, + 486 + ], + "score": 1.0, + "content": ". We use", + "type": "text" + }, + { + "bbox": [ + 180, + 471, + 206, + 482 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 469, + 506, + 486 + ], + "score": 1.0, + "content": "to denote the augmented distinguishing matrix of such a network, then we", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 482, + 128, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 128, + 496 + ], + "score": 1.0, + "content": "have", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27.5 + }, + { + "type": "interline_equation", + "bbox": [ + 257, + 491, + 354, + 506 + ], + "lines": [ + { + "bbox": [ + 257, + 491, + 354, + 506 + ], + "spans": [ + { + "bbox": [ + 257, + 491, + 354, + 506 + ], + "score": 0.92, + "content": "M ^ { D _ { Q } } = Q \\otimes Q M ^ { W Q } .", + "type": "interline_equation", + "image_path": "ae153855fedd9a054fa05fb49befe7e52889674f806ff05bda6c7d86dc26e21b.jpg" + } + ] + } + ], + "index": 30, + "virtual_lines": [ + { + "bbox": [ + 257, + 491, + 354, + 506 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 513, + 505, + 619 + ], + "lines": [ + { + "bbox": [ + 105, + 512, + 506, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 512, + 349, + 528 + ], + "score": 1.0, + "content": "Therefore we can first analyze the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 349, + 513, + 376, + 525 + ], + "score": 0.92, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 512, + 397, + 528 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 397, + 512, + 441, + 527 + ], + "score": 0.94, + "content": "\\widetilde { W } = W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 512, + 485, + 528 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + }, + { + "bbox": [ + 486, + 515, + 495, + 527 + ], + "score": 0.86, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 512, + 506, + 528 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 525, + 506, + 538 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 201, + 538 + ], + "score": 1.0, + "content": "a Gaussian matrix, and", + "type": "text" + }, + { + "bbox": [ + 202, + 526, + 214, + 536 + ], + "score": 0.69, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 214, + 525, + 261, + 538 + ], + "score": 1.0, + "content": "is fixed, so", + "type": "text" + }, + { + "bbox": [ + 262, + 526, + 282, + 537 + ], + "score": 0.86, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 525, + 506, + 538 + ], + "score": 1.0, + "content": "is also a Gaussian random matrix except its entries are", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 537, + 506, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 537, + 390, + 549 + ], + "score": 1.0, + "content": "not i.i.d. More precisely, there are only correlations within columns of", + "type": "text" + }, + { + "bbox": [ + 390, + 537, + 410, + 548 + ], + "score": 0.87, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 537, + 506, + 549 + ], + "score": 1.0, + "content": ", and for any column of", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 107, + 547, + 505, + 560 + ], + "spans": [ + { + "bbox": [ + 107, + 548, + 126, + 559 + ], + "score": 0.76, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 548, + 227, + 560 + ], + "score": 1.0, + "content": ", the covariance matrix is", + "type": "text" + }, + { + "bbox": [ + 227, + 547, + 256, + 558 + ], + "score": 0.88, + "content": "W W ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 548, + 404, + 560 + ], + "score": 1.0, + "content": ". Since the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 405, + 549, + 416, + 558 + ], + "score": 0.82, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 548, + 456, + 560 + ], + "score": 1.0, + "content": "is at least", + "type": "text" + }, + { + "bbox": [ + 457, + 550, + 463, + 560 + ], + "score": 0.8, + "content": "\\rho", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 548, + 505, + 560 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 556, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 558, + 189, + 571 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( W W ^ { \\top } ) \\geq \\rho ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 556, + 315, + 572 + ], + "score": 1.0, + "content": ". Let the covariance matrix of", + "type": "text" + }, + { + "bbox": [ + 316, + 559, + 336, + 570 + ], + "score": 0.83, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 556, + 351, + 572 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 351, + 558, + 420, + 571 + ], + "score": 0.93, + "content": "\\sum _ { W Q } \\mathbf { \\Psi } \\in \\mathbb { R } ^ { k d \\times k d }", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 556, + 506, + 572 + ], + "score": 1.0, + "content": ", which has smallest", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 569, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 200, + 585 + ], + "score": 1.0, + "content": "singular value at least", + "type": "text" + }, + { + "bbox": [ + 200, + 570, + 210, + 582 + ], + "score": 0.88, + "content": "\\rho ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 211, + 569, + 302, + 585 + ], + "score": 1.0, + "content": ". Therefore we know", + "type": "text" + }, + { + "bbox": [ + 302, + 570, + 366, + 583 + ], + "score": 0.94, + "content": "\\Sigma _ { W Q } \\ \\succeq \\ \\rho ^ { 2 } I _ { k d }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 569, + 506, + 585 + ], + "score": 1.0, + "content": ". It’s not hard to verify that with", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 104, + 581, + 505, + 597 + ], + "spans": [ + { + "bbox": [ + 104, + 581, + 183, + 597 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 582, + 252, + 596 + ], + "score": 0.92, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 581, + 356, + 597 + ], + "score": 1.0, + "content": ", the norm of every row of", + "type": "text" + }, + { + "bbox": [ + 356, + 584, + 376, + 595 + ], + "score": 0.85, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 581, + 478, + 597 + ], + "score": 1.0, + "content": "is upper bounded by poly", + "type": "text" + }, + { + "bbox": [ + 478, + 583, + 501, + 595 + ], + "score": 0.78, + "content": "( \\tau , d )", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 581, + 505, + 597 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 594, + 506, + 608 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 322, + 608 + ], + "score": 1.0, + "content": "By Claim 1, any convex property that holds for any", + "type": "text" + }, + { + "bbox": [ + 322, + 594, + 373, + 606 + ], + "score": 0.91, + "content": "\\mathcal { N } ( 0 , \\rho ^ { 2 } I _ { k d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 594, + 506, + 608 + ], + "score": 1.0, + "content": "perturbation must also hold for", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 604, + 377, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 606, + 136, + 619 + ], + "score": 0.89, + "content": "\\Sigma _ { W Q } { } ^ { 4 }", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 604, + 302, + 620 + ], + "score": 1.0, + "content": ". Thus, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 302, + 606, + 372, + 619 + ], + "score": 0.87, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 604, + 377, + 620 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 35 + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 621, + 375, + 636 + ], + "lines": [ + { + "bbox": [ + 235, + 621, + 375, + 636 + ], + "spans": [ + { + "bbox": [ + 235, + 621, + 375, + 636 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "1f3b1f5426fd1eccb343d9f5d351497230087092181b5198744cde5c888c086b.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 235, + 621, + 375, + 636 + ], + "spans": [], + "index": 40 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 643, + 505, + 681 + ], + "lines": [ + { + "bbox": [ + 105, + 642, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 642, + 282, + 658 + ], + "score": 1.0, + "content": "To prepare for the next step, we will rewrite", + "type": "text" + }, + { + "bbox": [ + 282, + 643, + 309, + 654 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 642, + 506, + 658 + ], + "score": 1.0, + "content": "as the product of two matrices. According to the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 104, + 651, + 507, + 671 + ], + "spans": [ + { + "bbox": [ + 104, + 651, + 168, + 671 + ], + "score": 1.0, + "content": "closed form of", + "type": "text" + }, + { + "bbox": [ + 169, + 655, + 195, + 670 + ], + "score": 0.92, + "content": "M _ { i j } ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 651, + 361, + 671 + ], + "score": 1.0, + "content": "in Lemma 19, we know each column of", + "type": "text" + }, + { + "bbox": [ + 361, + 655, + 388, + 667 + ], + "score": 0.92, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 389, + 651, + 507, + 671 + ], + "score": 1.0, + "content": "can be expressed as a linear", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 669, + 311, + 682 + ], + "spans": [ + { + "bbox": [ + 106, + 669, + 169, + 682 + ], + "score": 1.0, + "content": "combination of", + "type": "text" + }, + { + "bbox": [ + 170, + 670, + 204, + 682 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i } \\otimes \\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 669, + 230, + 682 + ], + "score": 1.0, + "content": "’s and", + "type": "text" + }, + { + "bbox": [ + 230, + 669, + 261, + 681 + ], + "score": 0.58, + "content": "{ \\mathrm { v e c } } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 669, + 311, + 682 + ], + "score": 1.0, + "content": ". Therefore:", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 42 + }, + { + "type": "interline_equation", + "bbox": [ + 234, + 684, + 377, + 705 + ], + "lines": [ + { + "bbox": [ + 234, + 684, + 377, + 705 + ], + "spans": [ + { + "bbox": [ + 234, + 684, + 377, + 705 + ], + "score": 0.93, + "content": "M ^ { W Q } = \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R ,", + "type": "interline_equation", + "image_path": "7d38ab33af16e878b447da53e70c35a24ed8a032b9d07c0da3a94c9092491261.jpg" + } + ] + } + ], + "index": 44, + "virtual_lines": [ + { + "bbox": [ + 234, + 684, + 377, + 705 + ], + "spans": [], + "index": 44 + } + ] + } + ], + "page_idx": 44, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 105, + 711, + 507, + 732 + ], + "lines": [ + { + "bbox": [ + 118, + 709, + 505, + 724 + ], + "spans": [ + { + "bbox": [ + 118, + 709, + 505, + 724 + ], + "score": 1.0, + "content": "4The conclusion of Theorem 9 is clearly convex because it is a probability, and probabilities are linear in", + "type": "text" + } + ] + }, + { + "bbox": [ + 106, + 721, + 227, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 227, + 732 + ], + "score": 1.0, + "content": "terms of mixture of distributions.", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "45", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 205 + ], + "lines": [ + { + "bbox": [ + 105, + 80, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 80, + 354, + 96 + ], + "score": 1.0, + "content": "Subspace Decoupling Next we need to consider the mixture", + "type": "text" + }, + { + "bbox": [ + 354, + 81, + 375, + 93 + ], + "score": 0.91, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 80, + 506, + 96 + ], + "score": 1.0, + "content": ". The worry here is that although", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 93, + 504, + 108 + ], + "spans": [ + { + "bbox": [ + 107, + 94, + 158, + 107 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D _ { Q } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 93, + 250, + 108 + ], + "score": 1.0, + "content": "is large, mixing with", + "type": "text" + }, + { + "bbox": [ + 251, + 95, + 261, + 105 + ], + "score": 0.76, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 93, + 455, + 108 + ], + "score": 1.0, + "content": "might introduce some cancellations and make", + "type": "text" + }, + { + "bbox": [ + 455, + 93, + 504, + 107 + ], + "score": 0.94, + "content": "\\sigma _ { \\mathrm { m i n } } ( M ^ { D ^ { \\prime } } )", + "type": "inline_equation" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 106, + 506, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 106, + 506, + 118 + ], + "score": 1.0, + "content": "much smaller. To prove that this cannot happen with high probability, the key observation is that in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 104, + 114, + 506, + 131 + ], + "spans": [ + { + "bbox": [ + 104, + 114, + 196, + 131 + ], + "score": 1.0, + "content": "the first step, to prove", + "type": "text" + }, + { + "bbox": [ + 196, + 116, + 250, + 129 + ], + "score": 0.93, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } )", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 114, + 422, + 131 + ], + "score": 1.0, + "content": "is large we have only used the property of", + "type": "text" + }, + { + "bbox": [ + 422, + 117, + 442, + 128 + ], + "score": 0.75, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 114, + 482, + 131 + ], + "score": 1.0, + "content": ". If we let", + "type": "text" + }, + { + "bbox": [ + 483, + 116, + 492, + 128 + ], + "score": 0.86, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 492, + 114, + 506, + 131 + ], + "score": 1.0, + "content": "be", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 127, + 505, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 177, + 140 + ], + "score": 1.0, + "content": "the projection of", + "type": "text" + }, + { + "bbox": [ + 177, + 128, + 186, + 139 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 127, + 348, + 140 + ], + "score": 1.0, + "content": "to the orthogonal space of row span of", + "type": "text" + }, + { + "bbox": [ + 349, + 128, + 361, + 138 + ], + "score": 0.63, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 127, + 385, + 140 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 386, + 128, + 395, + 139 + ], + "score": 0.85, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 127, + 505, + 140 + ], + "score": 1.0, + "content": "is still a Gaussian random", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 139, + 506, + 152 + ], + "spans": [ + { + "bbox": [ + 105, + 139, + 290, + 152 + ], + "score": 1.0, + "content": "matrix even if we condition on the value of", + "type": "text" + }, + { + "bbox": [ + 290, + 139, + 311, + 151 + ], + "score": 0.75, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 139, + 506, + 152 + ], + "score": 1.0, + "content": "! Therefore in the second step we will use the", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 149, + 505, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 149, + 210, + 163 + ], + "score": 1.0, + "content": "additional randomness in", + "type": "text" + }, + { + "bbox": [ + 211, + 149, + 220, + 162 + ], + "score": 0.87, + "content": "\\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 221, + 149, + 505, + 163 + ], + "score": 1.0, + "content": "to show that the cancellation cannot happen. The idea of partitioning", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 160, + 505, + 174 + ], + "spans": [ + { + "bbox": [ + 105, + 160, + 505, + 174 + ], + "score": 1.0, + "content": "the randomness of Gaussian matrices has been widely used in analysis of approximate message", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 104, + 171, + 506, + 185 + ], + "spans": [ + { + "bbox": [ + 104, + 171, + 506, + 185 + ], + "score": 1.0, + "content": "passing algorithms. The actual proof is more involved and we will need to partition the Gaussian", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 181, + 506, + 196 + ], + "spans": [ + { + "bbox": [ + 104, + 181, + 136, + 196 + ], + "score": 1.0, + "content": "matrix", + "type": "text" + }, + { + "bbox": [ + 136, + 183, + 145, + 194 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 181, + 506, + 196 + ], + "score": 1.0, + "content": "into more parts in order to handle the special column in the augmented distinguishing", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 195, + 141, + 205 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 141, + 205 + ], + "score": 1.0, + "content": "matrix .", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 5, + "bbox_fs": [ + 104, + 80, + 506, + 205 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 210, + 328, + 222 + ], + "lines": [ + { + "bbox": [ + 105, + 209, + 328, + 223 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 328, + 223 + ], + "score": 1.0, + "content": "Now we are ready to give the full proof of Theorem 10", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11, + "bbox_fs": [ + 105, + 209, + 328, + 223 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 231, + 504, + 254 + ], + "lines": [ + { + "bbox": [ + 105, + 230, + 506, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 473, + 244 + ], + "score": 1.0, + "content": "Proof of Theorem 10. Let us first recall the definition of augmented distinguishing matrix:", + "type": "text" + }, + { + "bbox": [ + 473, + 230, + 494, + 241 + ], + "score": 0.9, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 230, + 506, + 244 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 242, + 355, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 113, + 255 + ], + "score": 1.0, + "content": "a", + "type": "text" + }, + { + "bbox": [ + 113, + 242, + 124, + 252 + ], + "score": 0.86, + "content": "d ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 242, + 138, + 255 + ], + "score": 1.0, + "content": "by", + "type": "text" + }, + { + "bbox": [ + 139, + 243, + 173, + 254 + ], + "score": 0.92, + "content": "( k _ { 2 } + 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 174, + 242, + 265, + 255 + ], + "score": 1.0, + "content": "matrix, where the first", + "type": "text" + }, + { + "bbox": [ + 266, + 243, + 276, + 254 + ], + "score": 0.89, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 277, + 242, + 355, + 255 + ], + "score": 1.0, + "content": "columns consist of", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12.5, + "bbox_fs": [ + 105, + 230, + 506, + 255 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 187, + 257, + 423, + 273 + ], + "lines": [ + { + "bbox": [ + 187, + 257, + 423, + 273 + ], + "spans": [ + { + "bbox": [ + 187, + 257, + 423, + 273 + ], + "score": 0.9, + "content": "\\begin{array} { r } { M _ { i j } ^ { \\mathcal { D } ^ { \\prime } } : = \\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } \\big [ ( w _ { i } ^ { \\top } x ) ( w _ { j } ^ { \\top } x ) ( x \\otimes x ) \\mathbb { 1 } \\{ w _ { i } ^ { \\top } x w _ { j } ^ { \\top } x \\leq 0 \\} \\big ] , } \\end{array}", + "type": "interline_equation", + "image_path": "274fee240fb0b6ab4ae681e7d58ff82ae797dfd0c0944292f2b6a3fe1ccc7611.jpg" + } + ] + } + ], + "index": 14, + "virtual_lines": [ + { + "bbox": [ + 187, + 257, + 423, + 273 + ], + "spans": [], + "index": 14 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 276, + 505, + 298 + ], + "lines": [ + { + "bbox": [ + 105, + 275, + 506, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 275, + 198, + 289 + ], + "score": 1.0, + "content": "and the last column is", + "type": "text" + }, + { + "bbox": [ + 199, + 276, + 256, + 288 + ], + "score": 0.93, + "content": "\\mathbb { E } _ { x \\sim \\mathcal { D } ^ { \\prime } } [ x \\otimes x ]", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 275, + 386, + 289 + ], + "score": 1.0, + "content": ". According to the definition of", + "type": "text" + }, + { + "bbox": [ + 386, + 276, + 412, + 288 + ], + "score": 0.91, + "content": "( Q , \\lambda )", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 275, + 506, + 289 + ], + "score": 1.0, + "content": "-perturbation, if we let", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 286, + 245, + 300 + ], + "spans": [ + { + "bbox": [ + 106, + 287, + 122, + 299 + ], + "score": 0.89, + "content": "\\mathcal { D } _ { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 122, + 286, + 135, + 300 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 136, + 286, + 185, + 299 + ], + "score": 0.92, + "content": "\\mathcal { N } ( 0 , Q Q ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 286, + 245, + 300 + ], + "score": 1.0, + "content": ", then we have", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 275, + 506, + 300 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 241, + 300, + 370, + 317 + ], + "lines": [ + { + "bbox": [ + 241, + 300, + 370, + 317 + ], + "spans": [ + { + "bbox": [ + 241, + 300, + 370, + 317 + ], + "score": 0.91, + "content": "M ^ { D ^ { \\prime } } = ( 1 - \\lambda ) M ^ { D } + \\lambda M ^ { D _ { Q } } .", + "type": "interline_equation", + "image_path": "07bf5296eb95c4f0630c5b0afad5ea0e42c54e81e8a8dfc729d136076d3754e3.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 241, + 300, + 370, + 317 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 324, + 505, + 347 + ], + "lines": [ + { + "bbox": [ + 104, + 324, + 506, + 337 + ], + "spans": [ + { + "bbox": [ + 104, + 324, + 269, + 337 + ], + "score": 1.0, + "content": "In the first step, we will try to analyze", + "type": "text" + }, + { + "bbox": [ + 270, + 324, + 293, + 335 + ], + "score": 0.9, + "content": "M ^ { \\mathcal { D } _ { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 324, + 339, + 337 + ], + "score": 1.0, + "content": ". The first", + "type": "text" + }, + { + "bbox": [ + 339, + 326, + 350, + 336 + ], + "score": 0.88, + "content": "k _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 324, + 449, + 337 + ], + "score": 1.0, + "content": "columns of this matrix", + "type": "text" + }, + { + "bbox": [ + 449, + 324, + 473, + 335 + ], + "score": 0.9, + "content": "M ^ { \\mathcal { D } _ { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 324, + 506, + 337 + ], + "score": 1.0, + "content": "can be", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 334, + 152, + 349 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 152, + 349 + ], + "score": 1.0, + "content": "written as:", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18.5, + "bbox_fs": [ + 104, + 324, + 506, + 349 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 147, + 347, + 462, + 400 + ], + "lines": [ + { + "bbox": [ + 147, + 347, + 462, + 400 + ], + "spans": [ + { + "bbox": [ 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428.0 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 214, + 428.0, + 396, + 444.0 + ], + "spans": [], + "index": 25 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 450, + 505, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 450, + 505, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 191, + 462 + ], + "score": 1.0, + "content": "Except for the factor", + "type": "text" + }, + { + "bbox": [ + 191, + 451, + 219, + 461 + ], + "score": 0.9, + "content": "Q \\otimes Q", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 450, + 505, + 462 + ], + "score": 1.0, + "content": ", the remainder of these columns are exactly the same as the augmented", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 461, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 106, + 461, + 385, + 473 + ], + "score": 1.0, + "content": "distinguishing matrix of a network whose first layer weight matrix is", + "type": "text" + }, + { + "bbox": [ + 385, + 461, + 406, + 473 + ], + "score": 0.89, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 461, + 505, + 473 + ], + "score": 1.0, + "content": "and input distribution is", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 469, + 506, + 486 + ], + "spans": [ + { + "bbox": [ + 107, + 472, + 144, + 484 + ], + "score": 0.93, + "content": "\\mathcal { N } ( 0 , \\bar { I } _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 469, + 179, + 486 + ], + "score": 1.0, + "content": ". We use", + "type": "text" + }, + { + "bbox": [ + 180, + 471, + 206, + 482 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 469, + 506, + 486 + ], + "score": 1.0, + "content": "to denote the augmented distinguishing matrix of such a network, then we", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 482, + 128, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 128, + 496 + ], + "score": 1.0, + "content": "have", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27.5, + "bbox_fs": [ + 105, + 450, + 506, + 496 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 257, + 491, + 354, + 506 + ], + "lines": [ + { + "bbox": [ + 257, + 491, + 354, + 506 + ], + "spans": [ + { + "bbox": [ + 257, + 491, + 354, + 506 + ], + "score": 0.92, + "content": "M ^ { D _ { Q } } = Q \\otimes Q M ^ { W Q } .", + "type": "interline_equation", + "image_path": "ae153855fedd9a054fa05fb49befe7e52889674f806ff05bda6c7d86dc26e21b.jpg" + } + ] + } + ], + "index": 30, + "virtual_lines": [ + { + "bbox": [ + 257, + 491, + 354, + 506 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 513, + 505, + 619 + ], + "lines": [ + { + "bbox": [ + 105, + 512, + 506, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 512, + 349, + 528 + ], + "score": 1.0, + "content": "Therefore we can first analyze the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 349, + 513, + 376, + 525 + ], + "score": 0.92, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 512, + 397, + 528 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 397, + 512, + 441, + 527 + ], + "score": 0.94, + "content": "\\widetilde { W } = W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 512, + 485, + 528 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + }, + { + "bbox": [ + 486, + 515, + 495, + 527 + ], + "score": 0.86, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 512, + 506, + 528 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 525, + 506, + 538 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 201, + 538 + ], + "score": 1.0, + "content": "a Gaussian matrix, and", + "type": "text" + }, + { + "bbox": [ + 202, + 526, + 214, + 536 + ], + "score": 0.69, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 214, + 525, + 261, + 538 + ], + "score": 1.0, + "content": "is fixed, so", + "type": "text" + }, + { + "bbox": [ + 262, + 526, + 282, + 537 + ], + "score": 0.86, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 525, + 506, + 538 + ], + "score": 1.0, + "content": "is also a Gaussian random matrix except its entries are", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 537, + 506, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 537, + 390, + 549 + ], + "score": 1.0, + "content": "not i.i.d. More precisely, there are only correlations within columns of", + "type": "text" + }, + { + "bbox": [ + 390, + 537, + 410, + 548 + ], + "score": 0.87, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 537, + 506, + 549 + ], + "score": 1.0, + "content": ", and for any column of", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 107, + 547, + 505, + 560 + ], + "spans": [ + { + "bbox": [ + 107, + 548, + 126, + 559 + ], + "score": 0.76, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 548, + 227, + 560 + ], + "score": 1.0, + "content": ", the covariance matrix is", + "type": "text" + }, + { + "bbox": [ + 227, + 547, + 256, + 558 + ], + "score": 0.88, + "content": "W W ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 548, + 404, + 560 + ], + "score": 1.0, + "content": ". Since the smallest singular value of", + "type": "text" + }, + { + "bbox": [ + 405, + 549, + 416, + 558 + ], + "score": 0.82, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 416, + 548, + 456, + 560 + ], + "score": 1.0, + "content": "is at least", + "type": "text" + }, + { + "bbox": [ + 457, + 550, + 463, + 560 + ], + "score": 0.8, + "content": "\\rho", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 548, + 505, + 560 + ], + "score": 1.0, + "content": ", we know", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 556, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 558, + 189, + 571 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( W W ^ { \\top } ) \\geq \\rho ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 556, + 315, + 572 + ], + "score": 1.0, + "content": ". Let the covariance matrix of", + "type": "text" + }, + { + "bbox": [ + 316, + 559, + 336, + 570 + ], + "score": 0.83, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 556, + 351, + 572 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 351, + 558, + 420, + 571 + ], + "score": 0.93, + "content": "\\sum _ { W Q } \\mathbf { \\Psi } \\in \\mathbb { R } ^ { k d \\times k d }", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 556, + 506, + 572 + ], + "score": 1.0, + "content": ", which has smallest", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 569, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 200, + 585 + ], + "score": 1.0, + "content": "singular value at least", + "type": "text" + }, + { + "bbox": [ + 200, + 570, + 210, + 582 + ], + "score": 0.88, + "content": "\\rho ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 211, + 569, + 302, + 585 + ], + "score": 1.0, + "content": ". Therefore we know", + "type": "text" + }, + { + "bbox": [ + 302, + 570, + 366, + 583 + ], + "score": 0.94, + "content": "\\Sigma _ { W Q } \\ \\succeq \\ \\rho ^ { 2 } I _ { k d }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 569, + 506, + 585 + ], + "score": 1.0, + "content": ". It’s not hard to verify that with", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 104, + 581, + 505, + 597 + ], + "spans": [ + { + "bbox": [ + 104, + 581, + 183, + 597 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 582, + 252, + 596 + ], + "score": 0.92, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 581, + 356, + 597 + ], + "score": 1.0, + "content": ", the norm of every row of", + "type": "text" + }, + { + "bbox": [ + 356, + 584, + 376, + 595 + ], + "score": 0.85, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 581, + 478, + 597 + ], + "score": 1.0, + "content": "is upper bounded by poly", + "type": "text" + }, + { + "bbox": [ + 478, + 583, + 501, + 595 + ], + "score": 0.78, + "content": "( \\tau , d )", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 581, + 505, + 597 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 594, + 506, + 608 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 322, + 608 + ], + "score": 1.0, + "content": "By Claim 1, any convex property that holds for any", + "type": "text" + }, + { + "bbox": [ + 322, + 594, + 373, + 606 + ], + "score": 0.91, + "content": "\\mathcal { N } ( 0 , \\rho ^ { 2 } I _ { k d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 594, + 506, + 608 + ], + "score": 1.0, + "content": "perturbation must also hold for", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 604, + 377, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 606, + 136, + 619 + ], + "score": 0.89, + "content": "\\Sigma _ { W Q } { } ^ { 4 }", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 604, + 302, + 620 + ], + "score": 1.0, + "content": ". Thus, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 302, + 606, + 372, + 619 + ], + "score": 0.87, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 604, + 377, + 620 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 35, + "bbox_fs": [ + 104, + 512, + 506, + 620 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 621, + 375, + 636 + ], + "lines": [ + { + "bbox": [ + 235, + 621, + 375, + 636 + ], + "spans": [ + { + "bbox": [ + 235, + 621, + 375, + 636 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "1f3b1f5426fd1eccb343d9f5d351497230087092181b5198744cde5c888c086b.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 235, + 621, + 375, + 636 + ], + "spans": [], + "index": 40 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 643, + 505, + 681 + ], + "lines": [ + { + "bbox": [ + 105, + 642, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 642, + 282, + 658 + ], + "score": 1.0, + "content": "To prepare for the next step, we will rewrite", + "type": "text" + }, + { + "bbox": [ + 282, + 643, + 309, + 654 + ], + "score": 0.91, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 642, + 506, + 658 + ], + "score": 1.0, + "content": "as the product of two matrices. According to the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 104, + 651, + 507, + 671 + ], + "spans": [ + { + "bbox": [ + 104, + 651, + 168, + 671 + ], + "score": 1.0, + "content": "closed form of", + "type": "text" + }, + { + "bbox": [ + 169, + 655, + 195, + 670 + ], + "score": 0.92, + "content": "M _ { i j } ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 651, + 361, + 671 + ], + "score": 1.0, + "content": "in Lemma 19, we know each column of", + "type": "text" + }, + { + "bbox": [ + 361, + 655, + 388, + 667 + ], + "score": 0.92, + "content": "M ^ { W Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 389, + 651, + 507, + 671 + ], + "score": 1.0, + "content": "can be expressed as a linear", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 669, + 311, + 682 + ], + "spans": [ + { + "bbox": [ + 106, + 669, + 169, + 682 + ], + "score": 1.0, + "content": "combination of", + "type": "text" + }, + { + "bbox": [ + 170, + 670, + 204, + 682 + ], + "score": 0.89, + "content": "\\widetilde { w } _ { i } \\otimes \\widetilde { w } _ { j }", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 669, + 230, + 682 + ], + "score": 1.0, + "content": "’s and", + "type": "text" + }, + { + "bbox": [ + 230, + 669, + 261, + 681 + ], + "score": 0.58, + "content": "{ \\mathrm { v e c } } ( I _ { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 669, + 311, + 682 + ], + "score": 1.0, + "content": ". Therefore:", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 42, + "bbox_fs": [ + 104, + 642, + 507, + 682 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 234, + 684, + 377, + 705 + ], + "lines": [ + { + "bbox": [ + 234, + 684, + 377, + 705 + ], + "spans": [ + { + "bbox": [ + 234, + 684, + 377, + 705 + ], + "score": 0.93, + "content": "M ^ { W Q } = \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R ,", + "type": "interline_equation", + "image_path": "7d38ab33af16e878b447da53e70c35a24ed8a032b9d07c0da3a94c9092491261.jpg" + } + ] + } + ], + "index": 44, + "virtual_lines": [ + { + "bbox": [ + 234, + 684, + 377, + 705 + ], + "spans": [], + "index": 44 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 81, + 424, + 95 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 424, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 162, + 96 + ], + "score": 1.0, + "content": "where matrix", + "type": "text" + }, + { + "bbox": [ + 162, + 83, + 171, + 92 + ], + "score": 0.8, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 81, + 232, + 96 + ], + "score": 1.0, + "content": "has dimension", + "type": "text" + }, + { + "bbox": [ + 232, + 82, + 315, + 95 + ], + "score": 0.92, + "content": "( k ^ { 2 } + 1 ) \\times ( k _ { 2 } + 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 81, + 424, + 96 + ], + "score": 1.0, + "content": ". It’s not hard to verify that", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "interline_equation", + "bbox": [ + 200, + 99, + 410, + 121 + ], + "lines": [ + { + "bbox": [ + 200, + 99, + 410, + 121 + ], + "spans": [ + { + "bbox": [ + 200, + 99, + 410, + 121 + ], + "score": 0.89, + "content": "\\begin{array} { r } { \\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) \\leq \\Big \\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\Big \\| \\sigma _ { \\operatorname* { m i n } } ( R ) . } \\end{array}", + "type": "interline_equation", + "image_path": "5c26432d68e65ad67d2e1c95ce7b80420e2b6610ac4ad436507c6cd3dbe62e6e.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 200, + 99, + 410, + 121 + ], + "spans": [], + "index": 1 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 126, + 131, + 137 + ], + "lines": [ + { + "bbox": [ + 105, + 124, + 133, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 124, + 133, + 140 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 2 + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 134, + 384, + 171 + ], + "lines": [ + { + "bbox": [ + 226, + 134, + 384, + 171 + ], + "spans": [ + { + "bbox": [ + 226, + 134, + 384, + 171 + ], + "score": 0.94, + "content": "\\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\frac { \\sigma _ { \\operatorname* { m i n } } ( M ^ { W Q } ) } { \\left\\| \\left[ \\widetilde W ^ { \\top } \\otimes \\widetilde W ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| } .", + "type": "interline_equation", + "image_path": "8e10f34b817baf0c9b7cfecc74545bace3c8a466f6ac7fd3d5b852a27cf53d09.jpg" + } + ] + } + ], + "index": 3.5, + "virtual_lines": [ + { + "bbox": [ + 226, + 134, + 384, + 152.5 + ], + "spans": [], + "index": 3 + }, + { + "bbox": [ + 226, + 152.5, + 384, + 171.0 + ], + "spans": [], + "index": 4 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 174, + 505, + 210 + ], + "lines": [ + { + "bbox": [ + 105, + 173, + 504, + 189 + ], + "spans": [ + { + "bbox": [ + 105, + 173, + 147, + 189 + ], + "score": 1.0, + "content": "Note that", + "type": "text" + }, + { + "bbox": [ + 148, + 176, + 160, + 185 + ], + "score": 0.75, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 173, + 180, + 189 + ], + "score": 1.0, + "content": "is a", + "type": "text" + }, + { + "bbox": [ + 181, + 176, + 206, + 186 + ], + "score": 0.9, + "content": "k \\times d", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 173, + 259, + 189 + ], + "score": 1.0, + "content": "matrix with", + "type": "text" + }, + { + "bbox": [ + 259, + 175, + 304, + 187 + ], + "score": 0.93, + "content": "\\| w _ { i } \\| \\le \\tau", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 173, + 414, + 189 + ], + "score": 1.0, + "content": "for every row vector, and", + "type": "text" + }, + { + "bbox": [ + 414, + 173, + 462, + 187 + ], + "score": 0.92, + "content": "\\widetilde { W } = W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 173, + 494, + 189 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 495, + 176, + 504, + 187 + ], + "score": 0.83, + "content": "Q", + "type": "inline_equation" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 185, + 505, + 198 + ], + "spans": [ + { + "bbox": [ + 104, + 185, + 505, + 198 + ], + "score": 1.0, + "content": "is an standard Gaussian matrix. Thus, similar as the proof in Lemma 22, we can show that with", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 197, + 258, + 210 + ], + "spans": [ + { + "bbox": [ + 104, + 197, + 183, + 210 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 197, + 253, + 210 + ], + "score": 0.95, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 197, + 258, + 210 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6 + }, + { + "type": "interline_equation", + "bbox": [ + 163, + 214, + 447, + 237 + ], + "lines": [ + { + "bbox": [ + 163, + 214, + 447, + 237 + ], + "spans": [ + { + "bbox": [ + 163, + 214, + 447, + 237 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\left\\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| \\leq \\left\\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| _ { F } \\leq \\mathrm { p o l y } ( \\tau , d ) . } \\end{array}", + "type": "interline_equation", + "image_path": "22e6209952352cd619140b627511a27d194b4e1bb22caef4ce5f1bbf29111ae0.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 163, + 214, + 447, + 237 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 242, + 169, + 253 + ], + "lines": [ + { + "bbox": [ + 106, + 240, + 170, + 255 + ], + "spans": [ + { + "bbox": [ + 106, + 240, + 170, + 255 + ], + "score": 1.0, + "content": "Thus, we know", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 252, + 366, + 266 + ], + "lines": [ + { + "bbox": [ + 244, + 252, + 366, + 266 + ], + "spans": [ + { + "bbox": [ + 244, + 252, + 366, + 266 + ], + "score": 0.88, + "content": "\\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\operatorname { p o l y } ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "fa6b9d96fe006defb372cc7834297e55df9f8aec061c5c2088cdd89c83cf4cfb.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 244, + 252, + 366, + 266 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 273, + 506, + 344 + ], + "lines": [ + { + "bbox": [ + 105, + 273, + 506, + 287 + ], + "spans": [ + { + "bbox": [ + 105, + 273, + 464, + 287 + ], + "score": 1.0, + "content": "Now we will try to perform the second step using the idea of subspace decoupling. Let", + "type": "text" + }, + { + "bbox": [ + 464, + 275, + 491, + 286 + ], + "score": 0.88, + "content": "\\mathrm { P r o j } _ { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 491, + 273, + 506, + 287 + ], + "score": 1.0, + "content": "be", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 284, + 506, + 299 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 266, + 299 + ], + "score": 1.0, + "content": "the projection matrix to the row span of", + "type": "text" + }, + { + "bbox": [ + 266, + 285, + 278, + 295 + ], + "score": 0.77, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 278, + 284, + 311, + 299 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 311, + 285, + 403, + 297 + ], + "score": 0.92, + "content": "{ \\mathrm { P r o j } } _ { W ^ { \\perp } } = I _ { d } - { \\mathrm { P r o j } } _ { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 284, + 423, + 299 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 424, + 285, + 485, + 297 + ], + "score": 0.9, + "content": "\\bar { Q } \\doteq \\mathsf { P r o j } _ { W ^ { \\perp } } \\bar { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 284, + 506, + 299 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 294, + 506, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 169, + 311 + ], + "score": 1.0, + "content": "the columns of", + "type": "text" + }, + { + "bbox": [ + 170, + 296, + 231, + 308 + ], + "score": 0.92, + "content": "U \\in \\mathbb { R } ^ { d \\times ( d - k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 294, + 466, + 311 + ], + "score": 1.0, + "content": "be a set of orthonormal basis for the orthogonal subspace", + "type": "text" + }, + { + "bbox": [ + 467, + 297, + 485, + 308 + ], + "score": 0.89, + "content": "W ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 294, + 506, + 311 + ], + "score": 1.0, + "content": ". By", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 308, + 505, + 322 + ], + "spans": [ + { + "bbox": [ + 105, + 308, + 201, + 322 + ], + "score": 1.0, + "content": "symmetry of Gaussian,", + "type": "text" + }, + { + "bbox": [ + 202, + 309, + 237, + 320 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { W } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 308, + 319, + 322 + ], + "score": 1.0, + "content": "is independent with", + "type": "text" + }, + { + "bbox": [ + 319, + 309, + 360, + 320 + ], + "score": 0.92, + "content": "{ \\mathrm { P r o j } } _ { W ^ { \\perp } } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 360, + 308, + 505, + 322 + ], + "score": 1.0, + "content": ". Thus, from now on we will condi-", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 319, + 504, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 319, + 137, + 333 + ], + "score": 1.0, + "content": "tion on", + "type": "text" + }, + { + "bbox": [ + 138, + 320, + 172, + 331 + ], + "score": 0.92, + "content": "{ \\mathrm { P r o j } } _ { W } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 173, + 319, + 232, + 333 + ], + "score": 1.0, + "content": ", and still treat", + "type": "text" + }, + { + "bbox": [ + 232, + 320, + 273, + 331 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { W ^ { \\perp } } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 319, + 462, + 333 + ], + "score": 1.0, + "content": "as a Gaussian random matrix. More precisely,", + "type": "text" + }, + { + "bbox": [ + 463, + 320, + 504, + 331 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { W ^ { \\perp } } Q", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 328, + 451, + 345 + ], + "spans": [ + { + "bbox": [ + 104, + 328, + 219, + 345 + ], + "score": 1.0, + "content": "has the same distribution as", + "type": "text" + }, + { + "bbox": [ + 219, + 332, + 236, + 342 + ], + "score": 0.86, + "content": "U P", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 328, + 266, + 345 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 267, + 330, + 327, + 342 + ], + "score": 0.92, + "content": "P \\in \\mathbb { R } ^ { ( d - k ) \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 328, + 451, + 345 + ], + "score": 1.0, + "content": "is a standard Gaussian matrix.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 13.5 + }, + { + "type": "text", + "bbox": [ + 106, + 348, + 506, + 408 + ], + "lines": [ + { + "bbox": [ + 105, + 348, + 506, + 361 + ], + "spans": [ + { + "bbox": [ + 105, + 348, + 204, + 361 + ], + "score": 1.0, + "content": "We further decouple the", + "type": "text" + }, + { + "bbox": [ + 204, + 349, + 213, + 359 + ], + "score": 0.82, + "content": "P", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 348, + 506, + 361 + ], + "score": 1.0, + "content": "part into two subspaces (this is done mostly to handle the special column", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 359, + 506, + 371 + ], + "spans": [ + { + "bbox": [ + 104, + 359, + 324, + 371 + ], + "score": 1.0, + "content": "in augmented distinguishing matrix). Let the rows of", + "type": "text" + }, + { + "bbox": [ + 324, + 359, + 370, + 370 + ], + "score": 0.92, + "content": "V \\in \\mathbb { R } ^ { k \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 359, + 506, + 371 + ], + "score": 1.0, + "content": "be a set of orthonormal basis for", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 104, + 370, + 506, + 386 + ], + "spans": [ + { + "bbox": [ + 104, + 370, + 173, + 386 + ], + "score": 1.0, + "content": "the row span of", + "type": "text" + }, + { + "bbox": [ + 173, + 371, + 218, + 384 + ], + "score": 0.91, + "content": "\\widetilde { W } = W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 370, + 306, + 386 + ], + "score": 1.0, + "content": ". And let the rows of", + "type": "text" + }, + { + "bbox": [ + 307, + 371, + 376, + 383 + ], + "score": 0.91, + "content": "V ^ { \\perp } \\in \\mathbb { R } ^ { ( d - k ) \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 370, + 506, + 386 + ], + "score": 1.0, + "content": "be a a set of orthonormal basis", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 384, + 507, + 400 + ], + "spans": [ + { + "bbox": [ + 104, + 384, + 221, + 400 + ], + "score": 1.0, + "content": "for the orthogonal subspace", + "type": "text" + }, + { + "bbox": [ + 221, + 384, + 240, + 396 + ], + "score": 0.9, + "content": "\\widetilde { W } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 384, + 345, + 400 + ], + "score": 1.0, + "content": ". We can then decompose", + "type": "text" + }, + { + "bbox": [ + 346, + 386, + 363, + 396 + ], + "score": 0.84, + "content": "U P", + "type": "inline_equation" + }, + { + "bbox": [ + 363, + 384, + 448, + 400 + ], + "score": 1.0, + "content": "into the row span of", + "type": "text" + }, + { + "bbox": [ + 448, + 386, + 458, + 396 + ], + "score": 0.79, + "content": "V", + "type": "inline_equation" + }, + { + "bbox": [ + 458, + 384, + 476, + 400 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 477, + 385, + 492, + 396 + ], + "score": 0.89, + "content": "V ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 384, + 507, + 400 + ], + "score": 1.0, + "content": "as", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 396, + 142, + 410 + ], + "spans": [ + { + "bbox": [ + 105, + 396, + 142, + 410 + ], + "score": 1.0, + "content": "follows,", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 19 + }, + { + "type": "interline_equation", + "bbox": [ + 252, + 407, + 358, + 423 + ], + "lines": [ + { + "bbox": [ + 252, + 407, + 358, + 423 + ], + "spans": [ + { + "bbox": [ + 252, + 407, + 358, + 423 + ], + "score": 0.9, + "content": "U P \\overset { d } { = } U P _ { 1 } V ^ { \\perp } + U P _ { 2 } V ,", + "type": "interline_equation", + "image_path": "467a1b073a5a4470f45039a3f698ce94dcdf162ccb57419c82fca63431c41763.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 252, + 407, + 358, + 423 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 424, + 505, + 449 + ], + "lines": [ + { + "bbox": [ + 104, + 421, + 506, + 440 + ], + "spans": [ + { + "bbox": [ + 104, + 421, + 134, + 440 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 424, + 216, + 437 + ], + "score": 0.92, + "content": "P _ { 1 } \\in \\mathbb { R } ^ { ( d - k ) \\times ( d - k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 421, + 236, + 440 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 236, + 424, + 302, + 437 + ], + "score": 0.93, + "content": "P _ { 2 } \\in \\mathbb { R } ^ { ( d - k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 303, + 421, + 506, + 440 + ], + "score": 1.0, + "content": "are two independent standard Gaussian matrices.", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 436, + 246, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 436, + 246, + 450 + ], + "score": 1.0, + "content": "After this decomposition, we have", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 452, + 505, + 586 + ], + "lines": [ + { + "bbox": [ + 111, + 452, + 505, + 586 + ], + "spans": [ + { + "bbox": [ + 111, + 452, + 505, + 586 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\quad \\bar { Q } \\otimes \\bar { Q } \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { \\overset { d } { = } U P \\otimes U P \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { \\overset { d } { = } ( U P _ { 1 } V ^ { \\bot } + U P _ { 2 } V ) \\otimes ( U P _ { 1 } V ^ { \\bot } + U P _ { 2 } V ) \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { = U \\otimes U ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\otimes ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { = U \\otimes U \\left[ ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\widetilde { W } ^ { \\top } \\otimes ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) ^ { \\top } ) \\right] R } \\\\ & { = U \\otimes U \\left[ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\right] R , } \\end{array}", + "type": "interline_equation", + "image_path": "f75817f0d4763d3de96be2f25d8ab7f2ff4e9ed48a5f2dde8e2bc908a8276d4e.jpg" + } + ] + } + ], + "index": 26, + "virtual_lines": [ + { + "bbox": [ + 111, + 452, + 505, + 496.6666666666667 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 111, + 496.6666666666667, + 505, + 541.3333333333334 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 111, + 541.3333333333334, + 505, + 586.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 591, + 502, + 605 + ], + "lines": [ + { + "bbox": [ + 104, + 590, + 500, + 606 + ], + "spans": [ + { + "bbox": [ + 104, + 590, + 321, + 606 + ], + "score": 1.0, + "content": "where the last equality holds because the row span of", + "type": "text" + }, + { + "bbox": [ + 321, + 592, + 337, + 603 + ], + "score": 0.9, + "content": "V ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 590, + 482, + 606 + ], + "score": 1.0, + "content": "is orthogonal to the column span of", + "type": "text" + }, + { + "bbox": [ + 482, + 590, + 500, + 603 + ], + "score": 0.87, + "content": "\\widetilde { W } ^ { \\top }", + "type": "inline_equation" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 108, + 609, + 446, + 624 + ], + "lines": [ + { + "bbox": [ + 105, + 609, + 446, + 626 + ], + "spans": [ + { + "bbox": [ + 105, + 609, + 217, + 626 + ], + "score": 1.0, + "content": "Now, we go back to matrix", + "type": "text" + }, + { + "bbox": [ + 217, + 609, + 238, + 622 + ], + "score": 0.89, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 609, + 258, + 626 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 258, + 611, + 311, + 624 + ], + "score": 0.85, + "content": "\\operatorname { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 609, + 325, + 626 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 325, + 612, + 402, + 624 + ], + "score": 0.87, + "content": "\\operatorname { P r o j } _ { W ^ { \\perp } } \\otimes \\operatorname { P r o j } _ { W ^ { \\perp } }", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 609, + 446, + 626 + ], + "score": 1.0, + "content": ". We have,", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 629, + 514, + 736 + ], + "lines": [ + { + "bbox": [ + 111, + 629, + 514, + 736 + ], + "spans": [ + { + "bbox": [ + 111, + 629, + 514, + 736 + ], + "score": 0.92, + "content": "\\begin{array} { r l } { \\mathsf { r } _ { \\operatorname* { m i n } } \\bigl ( M ^ { \\mathcal { D } ^ { \\prime } } \\bigr ) = \\sigma _ { \\operatorname* { m i n } } \\bigl ( ( 1 - \\lambda ) M ^ { \\mathcal { D } } + \\lambda M ^ { \\mathcal { D } _ { Q } } \\bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) M ^ { \\mathcal { D } } + \\lambda Q \\otimes Q \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { \\ge \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda \\mathbf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } Q \\otimes Q \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda \\widetilde { Q } \\otimes \\widetilde { Q } \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda U \\otimes U \\Bigl [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\Bigr ] R \\Bigr ) } & { } \\end{array}", + "type": "interline_equation", + "image_path": "e2bdd87a905316c50e646f94b7f11bbeaa752a17b4c9131a36ab742788424c7c.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 111, + 629, + 514, + 664.6666666666666 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 111, + 664.6666666666666, + 514, + 700.3333333333333 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 111, + 700.3333333333333, + 514, + 735.9999999999999 + ], + "spans": [], + "index": 32 + } + ] + } + ], + "page_idx": 45, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 106, + 26, + 294, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "46", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 81, + 424, + 95 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 424, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 162, + 96 + ], + "score": 1.0, + "content": "where matrix", + "type": "text" + }, + { + "bbox": [ + 162, + 83, + 171, + 92 + ], + "score": 0.8, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 81, + 232, + 96 + ], + "score": 1.0, + "content": "has dimension", + "type": "text" + }, + { + "bbox": [ + 232, + 82, + 315, + 95 + ], + "score": 0.92, + "content": "( k ^ { 2 } + 1 ) \\times ( k _ { 2 } + 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 81, + 424, + 96 + ], + "score": 1.0, + "content": ". 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Thus, similar as the proof in Lemma 22, we can show that with", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 104, + 197, + 258, + 210 + ], + "spans": [ + { + "bbox": [ + 104, + 197, + 183, + 210 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 197, + 253, + 210 + ], + "score": 0.95, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 197, + 258, + 210 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6, + "bbox_fs": [ + 104, + 173, + 505, + 210 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 163, + 214, + 447, + 237 + ], + "lines": [ + { + "bbox": [ + 163, + 214, + 447, + 237 + ], + "spans": [ + { + "bbox": [ + 163, + 214, + 447, + 237 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\left\\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| \\leq \\left\\| \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] \\right\\| _ { F } \\leq \\mathrm { p o l y } ( \\tau , d ) . } \\end{array}", + "type": "interline_equation", + "image_path": "22e6209952352cd619140b627511a27d194b4e1bb22caef4ce5f1bbf29111ae0.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 163, + 214, + 447, + 237 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 242, + 169, + 253 + ], + "lines": [ + { + "bbox": [ + 106, + 240, + 170, + 255 + ], + "spans": [ + { + "bbox": [ + 106, + 240, + 170, + 255 + ], + "score": 1.0, + "content": "Thus, we know", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9, + "bbox_fs": [ + 106, + 240, + 170, + 255 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 252, + 366, + 266 + ], + "lines": [ + { + "bbox": [ + 244, + 252, + 366, + 266 + ], + "spans": [ + { + "bbox": [ + 244, + 252, + 366, + 266 + ], + "score": 0.88, + "content": "\\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\operatorname { p o l y } ( 1 / \\tau , 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "fa6b9d96fe006defb372cc7834297e55df9f8aec061c5c2088cdd89c83cf4cfb.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 244, + 252, + 366, + 266 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 273, + 506, + 344 + ], + "lines": [ + { + "bbox": [ + 105, + 273, + 506, + 287 + ], + "spans": [ + { + "bbox": [ + 105, + 273, + 464, + 287 + ], + "score": 1.0, + "content": "Now we will try to perform the second step using the idea of subspace decoupling. Let", + "type": "text" + }, + { + "bbox": [ + 464, + 275, + 491, + 286 + ], + "score": 0.88, + "content": "\\mathrm { P r o j } _ { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 491, + 273, + 506, + 287 + ], + "score": 1.0, + "content": "be", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 284, + 506, + 299 + ], + "spans": [ + { + "bbox": [ + 105, + 284, + 266, + 299 + ], + "score": 1.0, + "content": "the projection matrix to the row span of", + "type": "text" + }, + { + "bbox": [ + 266, + 285, + 278, + 295 + ], + "score": 0.77, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 278, + 284, + 311, + 299 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 311, + 285, + 403, + 297 + ], + "score": 0.92, + "content": "{ \\mathrm { P r o j } } _ { W ^ { \\perp } } = I _ { d } - { \\mathrm { P r o j } } _ { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 284, + 423, + 299 + ], + "score": 1.0, + "content": ". 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Let", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 294, + 506, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 169, + 311 + ], + "score": 1.0, + "content": "the columns of", + "type": "text" + }, + { + "bbox": [ + 170, + 296, + 231, + 308 + ], + "score": 0.92, + "content": "U \\in \\mathbb { R } ^ { d \\times ( d - k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 294, + 466, + 311 + ], + "score": 1.0, + "content": "be a set of orthonormal basis for the orthogonal subspace", + "type": "text" + }, + { + "bbox": [ + 467, + 297, + 485, + 308 + ], + "score": 0.89, + "content": "W ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 294, + 506, + 311 + ], + "score": 1.0, + "content": ". By", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 308, + 505, + 322 + ], + "spans": [ + { + "bbox": [ + 105, + 308, + 201, + 322 + ], + "score": 1.0, + "content": "symmetry of Gaussian,", + "type": "text" + }, + { + "bbox": [ + 202, + 309, + 237, + 320 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { W } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 308, + 319, + 322 + ], + "score": 1.0, + "content": "is independent with", + "type": "text" + }, + { + "bbox": [ + 319, + 309, + 360, + 320 + ], + "score": 0.92, + "content": "{ \\mathrm { P r o j } } _ { W ^ { \\perp } } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 360, + 308, + 505, + 322 + ], + "score": 1.0, + "content": ". Thus, from now on we will condi-", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 319, + 504, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 319, + 137, + 333 + ], + "score": 1.0, + "content": "tion on", + "type": "text" + }, + { + "bbox": [ + 138, + 320, + 172, + 331 + ], + "score": 0.92, + "content": "{ \\mathrm { P r o j } } _ { W } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 173, + 319, + 232, + 333 + ], + "score": 1.0, + "content": ", and still treat", + "type": "text" + }, + { + "bbox": [ + 232, + 320, + 273, + 331 + ], + "score": 0.92, + "content": "\\mathrm { P r o j } _ { W ^ { \\perp } } Q", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 319, + 462, + 333 + ], + "score": 1.0, + "content": "as a Gaussian random matrix. More precisely,", + "type": "text" + }, + { + "bbox": [ + 463, + 320, + 504, + 331 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { W ^ { \\perp } } Q", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 328, + 451, + 345 + ], + "spans": [ + { + "bbox": [ + 104, + 328, + 219, + 345 + ], + "score": 1.0, + "content": "has the same distribution as", + "type": "text" + }, + { + "bbox": [ + 219, + 332, + 236, + 342 + ], + "score": 0.86, + "content": "U P", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 328, + 266, + 345 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 267, + 330, + 327, + 342 + ], + "score": 0.92, + "content": "P \\in \\mathbb { R } ^ { ( d - k ) \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 327, + 328, + 451, + 345 + ], + "score": 1.0, + "content": "is a standard Gaussian matrix.", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 13.5, + "bbox_fs": [ + 104, + 273, + 506, + 345 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 348, + 506, + 408 + ], + "lines": [ + { + "bbox": [ + 105, + 348, + 506, + 361 + ], + "spans": [ + { + "bbox": [ + 105, + 348, + 204, + 361 + ], + "score": 1.0, + "content": "We further decouple the", + "type": "text" + }, + { + "bbox": [ + 204, + 349, + 213, + 359 + ], + "score": 0.82, + "content": "P", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 348, + 506, + 361 + ], + "score": 1.0, + "content": "part into two subspaces (this is done mostly to handle the special column", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 359, + 506, + 371 + ], + "spans": [ + { + "bbox": [ + 104, + 359, + 324, + 371 + ], + "score": 1.0, + "content": "in augmented distinguishing matrix). Let the rows of", + "type": "text" + }, + { + "bbox": [ + 324, + 359, + 370, + 370 + ], + "score": 0.92, + "content": "V \\in \\mathbb { R } ^ { k \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 359, + 506, + 371 + ], + "score": 1.0, + "content": "be a set of orthonormal basis for", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 104, + 370, + 506, + 386 + ], + "spans": [ + { + "bbox": [ + 104, + 370, + 173, + 386 + ], + "score": 1.0, + "content": "the row span of", + "type": "text" + }, + { + "bbox": [ + 173, + 371, + 218, + 384 + ], + "score": 0.91, + "content": "\\widetilde { W } = W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 370, + 306, + 386 + ], + "score": 1.0, + "content": ". And let the rows of", + "type": "text" + }, + { + "bbox": [ + 307, + 371, + 376, + 383 + ], + "score": 0.91, + "content": "V ^ { \\perp } \\in \\mathbb { R } ^ { ( d - k ) \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 370, + 506, + 386 + ], + "score": 1.0, + "content": "be a a set of orthonormal basis", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 384, + 507, + 400 + ], + "spans": [ + { + "bbox": [ + 104, + 384, + 221, + 400 + ], + "score": 1.0, + "content": "for the orthogonal subspace", + "type": "text" + }, + { + "bbox": [ + 221, + 384, + 240, + 396 + ], + "score": 0.9, + "content": "\\widetilde { W } ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 384, + 345, + 400 + ], + "score": 1.0, + "content": ". 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k ) \\times ( d - k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 421, + 236, + 440 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 236, + 424, + 302, + 437 + ], + "score": 0.93, + "content": "P _ { 2 } \\in \\mathbb { R } ^ { ( d - k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 303, + 421, + 506, + 440 + ], + "score": 1.0, + "content": "are two independent standard Gaussian matrices.", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 436, + 246, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 436, + 246, + 450 + ], + "score": 1.0, + "content": "After this decomposition, we have", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5, + "bbox_fs": [ + 104, + 421, + 506, + 450 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 452, + 505, + 586 + ], + "lines": [ + { + "bbox": [ + 111, + 452, + 505, + 586 + ], + "spans": [ + { + "bbox": [ + 111, + 452, + 505, + 586 + ], + "score": 0.93, + "content": "\\begin{array} { r l } & { \\quad \\bar { Q } \\otimes \\bar { Q } \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { \\overset { d } { = } U P \\otimes U P \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { \\overset { d } { = } ( U P _ { 1 } V ^ { \\bot } + U P _ { 2 } V ) \\otimes ( U P _ { 1 } V ^ { \\bot } + U P _ { 2 } V ) \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { = U \\otimes U ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\otimes ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\left[ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( I _ { d } ) \\right] R } \\\\ & { = U \\otimes U \\left[ ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\widetilde { W } ^ { \\top } \\otimes ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) ( P _ { 1 } V ^ { \\bot } + P _ { 2 } V ) ^ { \\top } ) \\right] R } \\\\ & { = U \\otimes U \\left[ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\right] R , } \\end{array}", + "type": "interline_equation", + "image_path": "f75817f0d4763d3de96be2f25d8ab7f2ff4e9ed48a5f2dde8e2bc908a8276d4e.jpg" + } + ] + } + ], + "index": 26, + "virtual_lines": [ + { + "bbox": [ + 111, + 452, + 505, + 496.6666666666667 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 111, + 496.6666666666667, + 505, + 541.3333333333334 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 111, + 541.3333333333334, + 505, + 586.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 591, + 502, + 605 + ], + "lines": [ + { + "bbox": [ + 104, + 590, + 500, + 606 + ], + "spans": [ + { + "bbox": [ + 104, + 590, + 321, + 606 + ], + "score": 1.0, + "content": "where the last equality holds because the row span of", + "type": "text" + }, + { + "bbox": [ + 321, + 592, + 337, + 603 + ], + "score": 0.9, + "content": "V ^ { \\perp }", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 590, + 482, + 606 + ], + "score": 1.0, + "content": "is orthogonal to the column span of", + "type": "text" + }, + { + "bbox": [ + 482, + 590, + 500, + 603 + ], + "score": 0.87, + "content": "\\widetilde { W } ^ { \\top }", + "type": "inline_equation" + } + ], + "index": 28 + } + ], + "index": 28, + "bbox_fs": [ + 104, + 590, + 500, + 606 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 609, + 446, + 624 + ], + "lines": [ + { + "bbox": [ + 105, + 609, + 446, + 626 + ], + "spans": [ + { + "bbox": [ + 105, + 609, + 217, + 626 + ], + "score": 1.0, + "content": "Now, we go back to matrix", + "type": "text" + }, + { + "bbox": [ + 217, + 609, + 238, + 622 + ], + "score": 0.89, + "content": "M ^ { \\mathcal { D ^ { \\prime } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 609, + 258, + 626 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 258, + 611, + 311, + 624 + ], + "score": 0.85, + "content": "\\operatorname { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 609, + 325, + 626 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 325, + 612, + 402, + 624 + ], + "score": 0.87, + "content": "\\operatorname { P r o j } _ { W ^ { \\perp } } \\otimes \\operatorname { P r o j } _ { W ^ { \\perp } }", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 609, + 446, + 626 + ], + "score": 1.0, + "content": ". We have,", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29, + "bbox_fs": [ + 105, + 609, + 446, + 626 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 629, + 514, + 736 + ], + "lines": [ + { + "bbox": [ + 111, + 629, + 514, + 736 + ], + "spans": [ + { + "bbox": [ + 111, + 629, + 514, + 736 + ], + "score": 0.92, + "content": "\\begin{array} { r l } { \\mathsf { r } _ { \\operatorname* { m i n } } \\bigl ( M ^ { \\mathcal { D } ^ { \\prime } } \\bigr ) = \\sigma _ { \\operatorname* { m i n } } \\bigl ( ( 1 - \\lambda ) M ^ { \\mathcal { D } } + \\lambda M ^ { \\mathcal { D } _ { Q } } \\bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) M ^ { \\mathcal { D } } + \\lambda Q \\otimes Q \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { \\ge \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda \\mathbf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } Q \\otimes Q \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda \\widetilde { Q } \\otimes \\widetilde { Q } \\Bigl [ \\widetilde { W } ^ { \\top } \\otimes \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( I _ { d } ) \\Bigr ] R \\Bigr ) } & { } \\\\ { = \\sigma _ { \\operatorname* { m i n } } \\Bigl ( ( 1 - \\lambda ) \\mathsf { P r o j } _ { W ^ { \\bot } \\otimes W ^ { \\bot } } M ^ { \\mathcal { D } } + \\lambda U \\otimes U \\Bigl [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathsf { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\Bigr ] R \\Bigr ) } & { } \\end{array}", + "type": "interline_equation", + "image_path": "e2bdd87a905316c50e646f94b7f11bbeaa752a17b4c9131a36ab742788424c7c.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 111, + 629, + 514, + 664.6666666666666 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 111, + 664.6666666666666, + 514, + 700.3333333333333 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 111, + 700.3333333333333, + 514, + 735.9999999999999 + ], + "spans": [], + "index": 32 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 122 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 97 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 131, + 97 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 131, + 83, + 140, + 92 + ], + "score": 0.75, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 81, + 335, + 97 + ], + "score": 1.0, + "content": "has full row rank, we know that the row span of", + "type": "text" + }, + { + "bbox": [ + 335, + 82, + 406, + 95 + ], + "score": 0.93, + "content": "\\mathrm { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } }", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 81, + 506, + 97 + ], + "score": 1.0, + "content": "belongs to the row span", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 104, + 93, + 504, + 110 + ], + "spans": [ + { + "bbox": [ + 104, + 93, + 118, + 110 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 96, + 127, + 105 + ], + "score": 0.79, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 93, + 260, + 110 + ], + "score": 1.0, + "content": ". 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Thus, there exists matrix", + "type": "text" + }, + { + "bbox": [ + 363, + 107, + 448, + 120 + ], + "score": 0.92, + "content": "C \\in R ^ { ( d - k ) ^ { 2 } \\times ( k ^ { 2 } + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 448, + 106, + 490, + 123 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "interline_equation", + "bbox": [ + 239, + 126, + 371, + 142 + ], + "lines": [ + { + "bbox": [ + 239, + 126, + 371, + 142 + ], + "spans": [ + { + "bbox": [ + 239, + 126, + 371, + 142 + ], + "score": 0.91, + "content": "\\mathrm { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } } = U \\otimes U C R .", + "type": "interline_equation", + "image_path": "3c11d49dfbafd22a046d9194a1a6e5fa7980ca0e9fd0c253dd6a870a50bb0411.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 239, + 126, + 371, + 142 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 146, + 131, + 158 + ], + "lines": [ + { + "bbox": [ + 106, + 145, + 134, + 160 + ], + "spans": [ + { + "bbox": [ + 106, + 145, + 134, + 160 + ], + "score": 1.0, + "content": "Thus,", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 162, + 514, + 227 + ], + "lines": [ + { + "bbox": [ + 111, + 162, + 514, + 227 + ], + "spans": [ + { + "bbox": [ + 111, + 162, + 514, + 227 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\mathsf { r } _ { \\mathrm { m i n } } \\big ( M ^ { \\mathcal { D } ^ { \\prime } } \\big ) = \\sigma _ { \\mathrm { m i n } } \\big ( \\big ( 1 - \\lambda \\big ) M ^ { \\mathcal { D } } + \\lambda M ^ { \\mathcal { D } _ { Q } } \\big ) } \\\\ & { \\qquad \\ge \\sigma _ { \\mathrm { m i n } } \\bigg ( \\big ( 1 - \\lambda \\big ) \\mathsf { P r o j } _ { W ^ { \\perp } \\otimes W ^ { \\perp } } M ^ { \\mathcal { D } } + \\lambda U \\otimes U \\Big [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\Big ] } \\\\ & { \\qquad = \\sigma _ { \\mathrm { m i n } } \\bigg ( \\lambda U \\otimes U \\Big ( \\frac { 1 - \\lambda } { \\lambda } C + \\big [ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\big ] \\Big ) R \\bigg ) . } \\end{array}", + "type": "interline_equation", + "image_path": "845cb895dc152d7e2f3dbbc6c0eb1f1991a495a1d7fbbc526e6ae519081c1f87.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 111, + 162, + 514, + 183.66666666666666 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 111, + 183.66666666666666, + 514, + 205.33333333333331 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 111, + 205.33333333333331, + 514, + 226.99999999999997 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 104, + 229, + 506, + 253 + ], + "lines": [ + { + "bbox": [ + 106, + 230, + 505, + 243 + ], + "spans": [ + { + "bbox": [ + 106, + 230, + 146, + 243 + ], + "score": 1.0, + "content": "Note that", + "type": "text" + }, + { + "bbox": [ + 147, + 231, + 155, + 240 + ], + "score": 0.84, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 230, + 225, + 243 + ], + "score": 1.0, + "content": "only depends on", + "type": "text" + }, + { + "bbox": [ + 226, + 230, + 235, + 240 + ], + "score": 0.82, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 235, + 230, + 253, + 243 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 253, + 230, + 276, + 240 + ], + "score": 0.36, + "content": "R , U", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 230, + 345, + 243 + ], + "score": 1.0, + "content": "only depends on", + "type": "text" + }, + { + "bbox": [ + 346, + 230, + 357, + 240 + ], + "score": 0.81, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 230, + 379, + 243 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 379, + 231, + 388, + 240 + ], + "score": 0.84, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 230, + 458, + 243 + ], + "score": 1.0, + "content": "only depends on", + "type": "text" + }, + { + "bbox": [ + 458, + 230, + 478, + 242 + ], + "score": 0.87, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 478, + 230, + 505, + 243 + ], + "score": 1.0, + "content": ". With", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 107, + 240, + 487, + 254 + ], + "spans": [ + { + "bbox": [ + 107, + 241, + 126, + 253 + ], + "score": 0.81, + "content": "W Q", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 240, + 153, + 254 + ], + "score": 1.0, + "content": "fixed,", + "type": "text" + }, + { + "bbox": [ + 153, + 242, + 162, + 251 + ], + "score": 0.83, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 240, + 249, + 254 + ], + "score": 1.0, + "content": "is also fixed. 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For convenience, denote", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 8.5 + }, + { + "type": "interline_equation", + "bbox": [ + 176, + 257, + 435, + 282 + ], + "lines": [ + { + "bbox": [ + 176, + 257, + 435, + 282 + ], + "spans": [ + { + "bbox": [ + 176, + 257, + 435, + 282 + ], + "score": 0.92, + "content": "H : = \\frac { 1 - \\lambda } { \\lambda } C + \\left[ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\right] .", + "type": "interline_equation", + "image_path": "c22d9867fe29ea401e69f54427fc49ff7bf8611c00b5a001cd745da68e751fe9.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 176, + 257, + 435, + 282 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 293, + 506, + 370 + ], + "lines": [ + { + "bbox": [ + 104, + 292, + 507, + 309 + ], + "spans": [ + { + "bbox": [ + 104, + 292, + 344, + 309 + ], + "score": 1.0, + "content": "Now, let’s prove that the smallest singular value of matrix", + "type": "text" + }, + { + "bbox": [ + 344, + 293, + 431, + 306 + ], + "score": 0.92, + "content": "H \\in \\mathbb { R } ^ { ( d - k ) ^ { 2 } \\times ( k ^ { 2 } + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 292, + 507, + 309 + ], + "score": 1.0, + "content": "is lower bounded", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 307, + 504, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 369, + 320 + ], + "score": 1.0, + "content": "using leave-one-out distance. Let’s first consider its submatrix", + "type": "text" + }, + { + "bbox": [ + 369, + 307, + 380, + 318 + ], + "score": 0.86, + "content": "\\hat { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 307, + 492, + 320 + ], + "score": 1.0, + "content": "which consists of the first", + "type": "text" + }, + { + "bbox": [ + 492, + 307, + 504, + 318 + ], + "score": 0.84, + "content": "k ^ { 2 }", + "type": "inline_equation" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 319, + 506, + 334 + ], + "spans": [ + { + "bbox": [ + 105, + 319, + 155, + 334 + ], + "score": 1.0, + "content": "columns of", + "type": "text" + }, + { + "bbox": [ + 156, + 321, + 166, + 331 + ], + "score": 0.8, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 167, + 319, + 308, + 334 + ], + "score": 1.0, + "content": ". Note that within random matrix", + "type": "text" + }, + { + "bbox": [ + 308, + 319, + 345, + 332 + ], + "score": 0.92, + "content": "P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 319, + 506, + 334 + ], + "score": 1.0, + "content": ", every row are independent with each", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 332, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 303, + 347 + ], + "score": 1.0, + "content": "other. Within each row, the covariance matrix is", + "type": "text" + }, + { + "bbox": [ + 304, + 333, + 332, + 345 + ], + "score": 0.89, + "content": "\\widetilde { W W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 333, + 384, + 347 + ], + "score": 1.0, + "content": ". Recall that", + "type": "text" + }, + { + "bbox": [ + 384, + 332, + 397, + 345 + ], + "score": 0.87, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 333, + 506, + 347 + ], + "score": 1.0, + "content": "is a random matrix whose", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 345, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 152, + 357 + ], + "score": 1.0, + "content": "covariance", + "type": "text" + }, + { + "bbox": [ + 152, + 345, + 212, + 358 + ], + "score": 0.93, + "content": "\\Sigma _ { W Q } \\succeq \\rho ^ { 2 } I _ { k d }", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 345, + 505, + 357 + ], + "score": 1.0, + "content": ", we can again apply Claim 1 with the property proved in Lemma 37. As", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 357, + 312, + 371 + ], + "spans": [ + { + "bbox": [ + 104, + 357, + 237, + 371 + ], + "score": 1.0, + "content": "a result, with probability at least", + "type": "text" + }, + { + "bbox": [ + 238, + 357, + 307, + 370 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 357, + 312, + 371 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 13.5 + }, + { + "type": "interline_equation", + "bbox": [ + 252, + 375, + 358, + 391 + ], + "lines": [ + { + "bbox": [ + 252, + 375, + 358, + 391 + ], + "spans": [ + { + "bbox": [ + 252, + 375, + 358, + 391 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { W } ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "db96c76df68772ed8c2b41b33504009098e9945bdd196599b8411970fda610c7.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 252, + 375, + 358, + 391 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 397, + 504, + 422 + ], + "lines": [ + { + "bbox": [ + 104, + 394, + 505, + 414 + ], + "spans": [ + { + "bbox": [ + 104, + 394, + 290, + 414 + ], + "score": 1.0, + "content": "Thus the covariance matrix of each row of", + "type": "text" + }, + { + "bbox": [ + 290, + 396, + 328, + 410 + ], + "score": 0.93, + "content": "P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 328, + 394, + 480, + 414 + ], + "score": 1.0, + "content": "has smallest singular value at least", + "type": "text" + }, + { + "bbox": [ + 480, + 400, + 505, + 411 + ], + "score": 0.82, + "content": "\\gamma : =", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 408, + 162, + 423 + ], + "spans": [ + { + "bbox": [ + 106, + 410, + 158, + 422 + ], + "score": 0.88, + "content": "\\operatorname { p o l y } ( 1 / d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 408, + 162, + 423 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18.5 + }, + { + "type": "text", + "bbox": [ + 107, + 428, + 504, + 463 + ], + "lines": [ + { + "bbox": [ + 105, + 426, + 506, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 162, + 442 + ], + "score": 1.0, + "content": "We can view", + "type": "text" + }, + { + "bbox": [ + 163, + 426, + 200, + 440 + ], + "score": 0.92, + "content": "P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 427, + 506, + 442 + ], + "score": 1.0, + "content": "as the summation of two independent Gaussian matrix, one of which has", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 440, + 506, + 453 + ], + "spans": [ + { + "bbox": [ + 105, + 440, + 181, + 452 + ], + "score": 1.0, + "content": "covariance matrix", + "type": "text" + }, + { + "bbox": [ + 182, + 441, + 219, + 453 + ], + "score": 0.92, + "content": "\\gamma I _ { ( d - k ) k }", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 440, + 506, + 452 + ], + "score": 1.0, + "content": ". For this matrix, we will do something very similar to Theorem 9 in", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 450, + 298, + 464 + ], + "spans": [ + { + "bbox": [ + 105, + 450, + 298, + 464 + ], + "score": 1.0, + "content": "order to lowerbound its smallest singular value.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 106, + 465, + 505, + 515 + ], + "lines": [ + { + "bbox": [ + 105, + 464, + 505, + 480 + ], + "spans": [ + { + "bbox": [ + 105, + 464, + 237, + 480 + ], + "score": 1.0, + "content": "Claim 2. 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For convenience, denote", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 8.5, + "bbox_fs": [ + 106, + 230, + 505, + 254 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 176, + 257, + 435, + 282 + ], + "lines": [ + { + "bbox": [ + 176, + 257, + 435, + 282 + ], + "spans": [ + { + "bbox": [ + 176, + 257, + 435, + 282 + ], + "score": 0.92, + "content": "H : = \\frac { 1 - \\lambda } { \\lambda } C + \\left[ P _ { 2 } V \\widetilde { W } ^ { \\top } \\otimes P _ { 2 } V \\widetilde { W } ^ { \\top } , \\mathrm { v e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } ) \\right] .", + "type": "interline_equation", + "image_path": "c22d9867fe29ea401e69f54427fc49ff7bf8611c00b5a001cd745da68e751fe9.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 176, + 257, + 435, + 282 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 293, + 506, + 370 + ], + "lines": [ + { + "bbox": [ + 104, + 292, + 507, + 309 + ], + "spans": [ + { + "bbox": [ + 104, + 292, + 344, + 309 + ], + "score": 1.0, + "content": "Now, let’s prove that the smallest singular value of matrix", + "type": "text" + }, + { + "bbox": [ + 344, + 293, + 431, + 306 + ], + "score": 0.92, + "content": "H \\in \\mathbb { R } ^ { ( d - k ) ^ { 2 } \\times ( k ^ { 2 } + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 292, + 507, + 309 + ], + "score": 1.0, + "content": "is lower bounded", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 307, + 504, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 369, + 320 + ], + "score": 1.0, + "content": "using leave-one-out distance. 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Note that within random matrix", + "type": "text" + }, + { + "bbox": [ + 308, + 319, + 345, + 332 + ], + "score": 0.92, + "content": "P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 319, + 506, + 334 + ], + "score": 1.0, + "content": ", every row are independent with each", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 332, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 303, + 347 + ], + "score": 1.0, + "content": "other. Within each row, the covariance matrix is", + "type": "text" + }, + { + "bbox": [ + 304, + 333, + 332, + 345 + ], + "score": 0.89, + "content": "\\widetilde { W W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 333, + 384, + 347 + ], + "score": 1.0, + "content": ". Recall that", + "type": "text" + }, + { + "bbox": [ + 384, + 332, + 397, + 345 + ], + "score": 0.87, + "content": "\\widetilde { W }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 333, + 506, + 347 + ], + "score": 1.0, + "content": "is a random matrix whose", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 345, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 152, + 357 + ], + "score": 1.0, + "content": "covariance", + "type": "text" + }, + { + "bbox": [ + 152, + 345, + 212, + 358 + ], + "score": 0.93, + "content": "\\Sigma _ { W Q } \\succeq \\rho ^ { 2 } I _ { k d }", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 345, + 505, + 357 + ], + "score": 1.0, + "content": ", we can again apply Claim 1 with the property proved in Lemma 37. As", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 104, + 357, + 312, + 371 + ], + "spans": [ + { + "bbox": [ + 104, + 357, + 237, + 371 + ], + "score": 1.0, + "content": "a result, with probability at least", + "type": "text" + }, + { + "bbox": [ + 238, + 357, + 307, + 370 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 357, + 312, + 371 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 13.5, + "bbox_fs": [ + 104, + 292, + 507, + 371 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 252, + 375, + 358, + 391 + ], + "lines": [ + { + "bbox": [ + 252, + 375, + 358, + 391 + ], + "spans": [ + { + "bbox": [ + 252, + 375, + 358, + 391 + ], + "score": 0.91, + "content": "\\sigma _ { \\operatorname* { m i n } } ( \\widetilde { W } ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "db96c76df68772ed8c2b41b33504009098e9945bdd196599b8411970fda610c7.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 252, + 375, + 358, + 391 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 397, + 504, + 422 + ], + "lines": [ + { + "bbox": [ + 104, + 394, + 505, + 414 + ], + "spans": [ + { + "bbox": [ + 104, + 394, + 290, + 414 + ], + "score": 1.0, + "content": "Thus the covariance matrix of each row of", + "type": "text" + }, + { + "bbox": [ + 290, + 396, + 328, + 410 + ], + "score": 0.93, + "content": "P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 328, + 394, + 480, + 414 + ], + "score": 1.0, + "content": "has smallest singular value at least", + "type": "text" + }, + { + "bbox": [ + 480, + 400, + 505, + 411 + ], + "score": 0.82, + "content": "\\gamma : =", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 408, + 162, + 423 + ], + "spans": [ + { + "bbox": [ + 106, + 410, + 158, + 422 + ], + "score": 0.88, + "content": "\\operatorname { p o l y } ( 1 / d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 408, + 162, + 423 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18.5, + "bbox_fs": [ + 104, + 394, + 505, + 423 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 428, + 504, + 463 + ], + "lines": [ + { + "bbox": [ + 105, + 426, + 506, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 162, + 442 + ], + "score": 1.0, + "content": "We can view", + "type": "text" + }, + { + "bbox": [ + 163, + 426, + 200, + 440 + ], + "score": 0.92, + "content": "P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 427, + 506, + 442 + ], + "score": 1.0, + "content": "as the summation of two independent Gaussian matrix, one of which has", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 440, + 506, + 453 + ], + "spans": [ + { + "bbox": [ + 105, + 440, + 181, + 452 + ], + "score": 1.0, + "content": "covariance matrix", + "type": "text" + }, + { + "bbox": [ + 182, + 441, + 219, + 453 + ], + "score": 0.92, + "content": "\\gamma I _ { ( d - k ) k }", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 440, + 506, + 452 + ], + "score": 1.0, + "content": ". For this matrix, we will do something very similar to Theorem 9 in", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 450, + 298, + 464 + ], + "spans": [ + { + "bbox": [ + 105, + 450, + 298, + 464 + ], + "score": 1.0, + "content": "order to lowerbound its smallest singular value.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 426, + 506, + 464 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 465, + 505, + 515 + ], + "lines": [ + { + "bbox": [ + 105, + 464, + 505, + 480 + ], + "spans": [ + { + "bbox": [ + 105, + 464, + 237, + 480 + ], + "score": 1.0, + "content": "Claim 2. For a random matrix", + "type": "text" + }, + { + "bbox": [ + 238, + 465, + 303, + 477 + ], + "score": 0.92, + "content": "K \\in \\mathbb { R } ^ { ( d - k ) \\times k }", + "type": "inline_equation" + }, + { + "bbox": [ + 303, + 464, + 370, + 480 + ], + "score": 1.0, + "content": "that is equal to", + "type": "text" + }, + { + "bbox": [ + 370, + 467, + 406, + 478 + ], + "score": 0.91, + "content": "K ^ { o } + E", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 464, + 435, + 480 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 435, + 468, + 445, + 477 + ], + "score": 0.79, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 464, + 505, + 480 + ], + "score": 1.0, + "content": "is a Gaussian", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 478, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 478, + 285, + 491 + ], + "score": 1.0, + "content": "random matrix whose entries have variance", + "type": "text" + }, + { + "bbox": [ + 285, + 480, + 292, + 489 + ], + "score": 0.72, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 478, + 305, + 491 + ], + "score": 1.0, + "content": ". If", + "type": "text" + }, + { + "bbox": [ + 306, + 478, + 336, + 489 + ], + "score": 0.91, + "content": "d \\geq 7 k", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 478, + 411, + 491 + ], + "score": 1.0, + "content": ", for any subspace", + "type": "text" + }, + { + "bbox": [ + 411, + 479, + 425, + 489 + ], + "score": 0.86, + "content": "S _ { C }", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 478, + 505, + 491 + ], + "score": 1.0, + "content": "that is independent", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 488, + 506, + 504 + ], + "spans": [ + { + "bbox": [ + 105, + 488, + 117, + 502 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 489, + 128, + 499 + ], + "score": 0.75, + "content": "K", + "type": "inline_equation" + }, + { + "bbox": [ + 128, + 488, + 242, + 502 + ], + "score": 1.0, + "content": "and has dimension at most", + "type": "text" + }, + { + "bbox": [ + 243, + 488, + 271, + 500 + ], + "score": 0.93, + "content": "k ^ { 2 } + 1", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 488, + 386, + 502 + ], + "score": 1.0, + "content": ", the leave-one-out distance", + "type": "text" + }, + { + "bbox": [ + 387, + 489, + 461, + 504 + ], + "score": 0.92, + "content": "d ( P r o j _ { S _ { C } ^ { \\perp } } K \\otimes K )", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 488, + 506, + 502 + ], + "score": 1.0, + "content": "is at least", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 501, + 162, + 515 + ], + "spans": [ + { + "bbox": [ + 106, + 502, + 157, + 515 + ], + "score": 0.9, + "content": "p o l y ( \\gamma , 1 / d )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 501, + 162, + 515 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 24.5, + "bbox_fs": [ + 105, + 464, + 506, + 515 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 522, + 505, + 559 + ], + "lines": [ + { + "bbox": [ + 106, + 523, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 523, + 404, + 535 + ], + "score": 1.0, + "content": "The proof idea is similar as Theorem 9, and we try to apply Lemma 31 to", + "type": "text" + }, + { + "bbox": [ + 404, + 524, + 436, + 534 + ], + "score": 0.9, + "content": "K \\otimes K", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 523, + 505, + 535 + ], + "score": 1.0, + "content": ". In the proof we", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 534, + 504, + 550 + ], + "spans": [ + { + "bbox": [ + 105, + 534, + 169, + 550 + ], + "score": 1.0, + "content": "should think of", + "type": "text" + }, + { + "bbox": [ + 170, + 534, + 232, + 547 + ], + "score": 0.95, + "content": "K : = P _ { 2 } V \\widetilde { W } ^ { \\top }", + "type": "inline_equation" + }, + { + "bbox": [ + 232, + 534, + 282, + 550 + ], + "score": 1.0, + "content": ", and denote", + "type": "text" + }, + { + "bbox": [ + 282, + 537, + 287, + 546 + ], + "score": 0.74, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 534, + 342, + 550 + ], + "score": 1.0, + "content": "-th column of", + "type": "text" + }, + { + "bbox": [ + 343, + 537, + 353, + 546 + ], + "score": 0.83, + "content": "K", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 534, + 365, + 550 + ], + "score": 1.0, + "content": "as", + "type": "text" + }, + { + "bbox": [ + 365, + 537, + 378, + 547 + ], + "score": 0.88, + "content": "K _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 378, + 534, + 489, + 550 + ], + "score": 1.0, + "content": ". 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We can similarly", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 181, + 320, + 197 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 244, + 197 + ], + "score": 1.0, + "content": "show that with probability at least", + "type": "text" + }, + { + "bbox": [ + 244, + 183, + 313, + 196 + ], + "score": 0.89, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 181, + 320, + 197 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5 + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 200, + 366, + 217 + ], + "lines": [ + { + "bbox": [ + 244, + 200, + 366, + 217 + ], + "spans": [ + { + "bbox": [ + 244, + 200, + 366, + 217 + ], + "score": 0.9, + "content": "\\left\\| \\mathrm { P r o j } _ { \\hat { S } ^ { \\perp } } \\hat { H } _ { i i } ^ { \\prime } \\right\\| \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "956200b7cf2d97ead1bc6f8f0467f67de19a5f28fc6a76aa7ff8c1c945848859.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 244, + 200, + 366, + 217 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 228, + 504, + 252 + ], + "lines": [ + { + "bbox": [ + 105, + 226, + 505, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 226, + 406, + 243 + ], + "score": 1.0, + "content": "Thus, by union bound, we know that the leave-one-out distance of matrix", + "type": "text" + }, + { + "bbox": [ + 406, + 227, + 419, + 239 + ], + "score": 0.89, + "content": "{ \\hat { H } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 226, + 505, + 243 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 239, + 163, + 254 + ], + "spans": [ + { + "bbox": [ + 106, + 240, + 158, + 252 + ], + "score": 0.8, + "content": "\\mathrm { p o l y } ( 1 / d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 239, + 163, + 254 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7.5 + }, + { + "type": "text", + "bbox": [ + 106, + 255, + 505, + 304 + ], + "lines": [ + { + "bbox": [ + 104, + 255, + 506, + 270 + ], + "spans": [ + { + "bbox": [ + 104, + 255, + 259, + 270 + ], + "score": 1.0, + "content": "Now, let’s add the additional column", + "type": "text" + }, + { + "bbox": [ + 260, + 256, + 342, + 269 + ], + "score": 0.88, + "content": "\\mathsf { r e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 255, + 506, + 270 + ], + "score": 1.0, + "content": "into consideration. For convenience we", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 267, + 505, + 280 + ], + "spans": [ + { + "bbox": [ + 105, + 267, + 198, + 280 + ], + "score": 1.0, + "content": "denote this column by", + "type": "text" + }, + { + "bbox": [ + 198, + 268, + 204, + 278 + ], + "score": 0.66, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 267, + 346, + 280 + ], + "score": 1.0, + "content": ". We will first prove that the vector", + "type": "text" + }, + { + "bbox": [ + 347, + 268, + 352, + 278 + ], + "score": 0.73, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 267, + 505, + 280 + ], + "score": 1.0, + "content": "has large norm when projected to the", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 279, + 505, + 293 + ], + "spans": [ + { + "bbox": [ + 106, + 280, + 247, + 293 + ], + "score": 1.0, + "content": "orthogonal subspace of columns in", + "type": "text" + }, + { + "bbox": [ + 248, + 279, + 258, + 290 + ], + "score": 0.86, + "content": "\\hat { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 280, + 435, + 293 + ], + "score": 1.0, + "content": ", then we will combine this with the fact that", + "type": "text" + }, + { + "bbox": [ + 435, + 279, + 472, + 293 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( { \\hat { H } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 280, + 505, + 293 + ], + "score": 1.0, + "content": "is large", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 291, + 422, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 292, + 157, + 304 + ], + "score": 1.0, + "content": "to show that", + "type": "text" + }, + { + "bbox": [ + 158, + 291, + 195, + 304 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 292, + 422, + 304 + ], + "score": 1.0, + "content": "is also large (this last step is very similar to Lemma 21).", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 10.5 + }, + { + "type": "text", + "bbox": [ + 106, + 309, + 506, + 381 + ], + "lines": [ + { + "bbox": [ + 106, + 308, + 504, + 322 + ], + "spans": [ + { + "bbox": [ + 106, + 310, + 176, + 322 + ], + "score": 1.0, + "content": "We know matrix", + "type": "text" + }, + { + "bbox": [ + 176, + 308, + 186, + 320 + ], + "score": 0.86, + "content": "\\hat { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 310, + 332, + 322 + ], + "score": 1.0, + "content": "only depends on the randomness of", + "type": "text" + }, + { + "bbox": [ + 333, + 311, + 344, + 321 + ], + "score": 0.88, + "content": "P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 310, + 395, + 322 + ], + "score": 1.0, + "content": ". Thus, with", + "type": "text" + }, + { + "bbox": [ + 395, + 311, + 407, + 321 + ], + "score": 0.88, + "content": "P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 310, + 493, + 322 + ], + "score": 1.0, + "content": "fixed, all columns in", + "type": "text" + }, + { + "bbox": [ + 494, + 311, + 504, + 320 + ], + "score": 0.8, + "content": "H", + "type": "inline_equation" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 321, + 504, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 321, + 187, + 333 + ], + "score": 1.0, + "content": "are fixed except for", + "type": "text" + }, + { + "bbox": [ + 188, + 322, + 193, + 331 + ], + "score": 0.69, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 321, + 345, + 333 + ], + "score": 1.0, + "content": ". Now, we rely on the randomness in", + "type": "text" + }, + { + "bbox": [ + 345, + 322, + 357, + 333 + ], + "score": 0.88, + "content": "P _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 321, + 498, + 333 + ], + "score": 1.0, + "content": "to show that the distance between", + "type": "text" + }, + { + "bbox": [ + 498, + 322, + 504, + 331 + ], + "score": 0.7, + "content": "b", + "type": "inline_equation" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 333, + 505, + 344 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 240, + 344 + ], + "score": 1.0, + "content": "and the span of other columns in", + "type": "text" + }, + { + "bbox": [ + 241, + 333, + 251, + 342 + ], + "score": 0.83, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 333, + 505, + 344 + ], + "score": 1.0, + "content": "is lower bounded. In order to get ride of the correlation within", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 343, + 505, + 356 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 139, + 356 + ], + "score": 1.0, + "content": "column", + "type": "text" + }, + { + "bbox": [ + 140, + 344, + 144, + 353 + ], + "score": 0.75, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 343, + 375, + 356 + ], + "score": 1.0, + "content": ", we also need to consider a subset of its rows indexed by", + "type": "text" + }, + { + "bbox": [ + 375, + 344, + 411, + 355 + ], + "score": 0.92, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 343, + 461, + 356 + ], + "score": 1.0, + "content": ", denoted by", + "type": "text" + }, + { + "bbox": [ + 462, + 343, + 470, + 353 + ], + "score": 0.84, + "content": "b ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 343, + 505, + 356 + ], + "score": 1.0, + "content": ". Let the", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 353, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 168, + 370 + ], + "score": 1.0, + "content": "first column of", + "type": "text" + }, + { + "bbox": [ + 169, + 356, + 181, + 367 + ], + "score": 0.88, + "content": "P _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 353, + 194, + 370 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 194, + 354, + 236, + 367 + ], + "score": 0.92, + "content": "p \\in \\mathbb { R } ^ { d - k }", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 353, + 441, + 370 + ], + "score": 1.0, + "content": ", and the submatrix consisting of other columns be", + "type": "text" + }, + { + "bbox": [ + 441, + 354, + 452, + 367 + ], + "score": 0.89, + "content": "\\hat { P } _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 453, + 353, + 474, + 370 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 474, + 356, + 491, + 369 + ], + "score": 0.91, + "content": "S _ { \\hat { H } ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 492, + 353, + 506, + 370 + ], + "score": 1.0, + "content": "be", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 368, + 219, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 369, + 185, + 381 + ], + "score": 1.0, + "content": "the column span of", + "type": "text" + }, + { + "bbox": [ + 185, + 368, + 198, + 379 + ], + "score": 0.89, + "content": "{ \\hat { H } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 369, + 219, + 381 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 15.5 + }, + { + "type": "interline_equation", + "bbox": [ + 196, + 385, + 414, + 402 + ], + "lines": [ + { + "bbox": [ + 196, + 385, + 414, + 402 + ], + "spans": [ + { + "bbox": [ + 196, + 385, + 414, + 402 + ], + "score": 0.88, + "content": "\\hat { S } _ { \\hat { H } ^ { \\prime } } = S _ { \\hat { H } ^ { \\prime } } \\cup S _ { C ^ { \\prime } } \\cup \\mathrm { s p a n } ( \\mathrm { v e c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } ) ^ { \\prime } , \\mathrm { v e c } ( P _ { 2 } P _ { 2 } ^ { \\top } ) ^ { \\prime } ) ,", + "type": "interline_equation", + "image_path": "fcb7ede60f457131802d9d05d060bb89ee3d9f5d7128602088bea5bf19cc29b6.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 196, + 385, + 414, + 402 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 406, + 505, + 433 + ], + "lines": [ + { + "bbox": [ + 106, + 404, + 505, + 421 + ], + "spans": [ + { + "bbox": [ + 106, + 404, + 133, + 421 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 406, + 184, + 420 + ], + "score": 0.9, + "content": "\\mathsf { v e c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } ) ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 404, + 273, + 421 + ], + "score": 1.0, + "content": "is the restriction of ve", + "type": "text" + }, + { + "bbox": [ + 273, + 406, + 310, + 420 + ], + "score": 0.71, + "content": "\\mathsf { c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 404, + 403, + 421 + ], + "score": 1.0, + "content": "to the rows indexed by", + "type": "text" + }, + { + "bbox": [ + 404, + 408, + 439, + 419 + ], + "score": 0.92, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 404, + 505, + 421 + ], + "score": 1.0, + "content": ". The dimension", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 417, + 443, + 435 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 117, + 435 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 419, + 135, + 433 + ], + "score": 0.92, + "content": "\\hat { S } _ { \\hat { H } ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 417, + 177, + 435 + ], + "score": 1.0, + "content": "is at most", + "type": "text" + }, + { + "bbox": [ + 177, + 420, + 308, + 433 + ], + "score": 0.91, + "content": "k ^ { 2 } + k ^ { 2 } + 1 + 2 \\leq ( d - k ) ^ { 2 } / 1 2", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 417, + 369, + 435 + ], + "score": 1.0, + "content": ", assuming that", + "type": "text" + }, + { + "bbox": [ + 369, + 421, + 405, + 433 + ], + "score": 0.92, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 417, + 443, + 435 + ], + "score": 1.0, + "content": ". Clearly,", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20.5 + }, + { + "type": "interline_equation", + "bbox": [ + 241, + 437, + 368, + 475 + ], + "lines": [ + { + "bbox": [ + 241, + 437, + 368, + 475 + ], + "spans": [ + { + "bbox": [ + 241, + 437, + 368, + 475 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\mathrm { P r o j } _ { S _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } b ^ { \\prime } \\geq \\mathrm { P r o j } _ { \\hat { S } _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } b ^ { \\prime } } \\\\ & { \\qquad = \\mathrm { P r o j } _ { \\hat { S } _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } p _ { L _ { 1 } } \\otimes p _ { L _ { 2 } } , } \\end{array}", + "type": "interline_equation", + "image_path": "ee004e3c8ee7615c0c4b76303eb92f90b1b3ac75aeb82f154373186d62615a93.jpg" + } + ] + } + ], + "index": 22.5, + "virtual_lines": [ + { + "bbox": [ + 241, + 437, + 368, + 456.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 241, + 456.0, + 368, + 475.0 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 478, + 505, + 513 + ], + "lines": [ + { + "bbox": [ + 106, + 477, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 106, + 477, + 133, + 491 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 480, + 146, + 489 + ], + "score": 0.85, + "content": "p _ { L }", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 477, + 226, + 491 + ], + "score": 1.0, + "content": "is the restriction of", + "type": "text" + }, + { + "bbox": [ + 227, + 480, + 233, + 489 + ], + "score": 0.82, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 477, + 314, + 491 + ], + "score": 1.0, + "content": "to rows indexed by", + "type": "text" + }, + { + "bbox": [ + 315, + 479, + 322, + 488 + ], + "score": 0.79, + "content": "L", + "type": "inline_equation" + }, + { + "bbox": [ + 323, + 477, + 368, + 491 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + }, + { + "bbox": [ + 368, + 480, + 384, + 490 + ], + "score": 0.88, + "content": "p _ { L _ { 1 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 477, + 403, + 491 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 403, + 480, + 419, + 490 + ], + "score": 0.87, + "content": "p _ { L _ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 477, + 505, + 491 + ], + "score": 1.0, + "content": "are two independent", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 489, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 487, + 501 + ], + "score": 1.0, + "content": "standard Gaussian vectors. Thus, according to Lemma 31, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 487, + 489, + 505, + 500 + ], + "score": 0.74, + "content": "1 -", + "type": "inline_equation" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 500, + 454, + 515 + ], + "spans": [ + { + "bbox": [ + 106, + 500, + 159, + 514 + ], + "score": 0.92, + "content": "\\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 500, + 249, + 515 + ], + "score": 1.0, + "content": ", the distance between", + "type": "text" + }, + { + "bbox": [ + 249, + 501, + 257, + 511 + ], + "score": 0.85, + "content": "b ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 500, + 354, + 515 + ], + "score": 1.0, + "content": "and the column span of", + "type": "text" + }, + { + "bbox": [ + 354, + 500, + 367, + 511 + ], + "score": 0.89, + "content": "{ \\hat { H } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 500, + 427, + 515 + ], + "score": 1.0, + "content": "is at least poly", + "type": "text" + }, + { + "bbox": [ + 428, + 501, + 450, + 514 + ], + "score": 0.62, + "content": "( 1 / d )", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 500, + 454, + 515 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 516, + 505, + 560 + ], + "lines": [ + { + "bbox": [ + 105, + 516, + 506, + 533 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 210, + 532 + ], + "score": 1.0, + "content": "Claim 3. For any matrix", + "type": "text" + }, + { + "bbox": [ + 210, + 516, + 278, + 531 + ], + "score": 0.92, + "content": "A \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } \\times k ^ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 517, + 333, + 533 + ], + "score": 1.0, + "content": "and a vector", + "type": "text" + }, + { + "bbox": [ + 333, + 516, + 384, + 531 + ], + "score": 0.9, + "content": "v \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 520, + 506, + 533 + ], + "score": 1.0, + "content": ", if the leave-one-out distance", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 532, + 505, + 549 + ], + "spans": [ + { + "bbox": [ + 107, + 536, + 150, + 549 + ], + "score": 0.82, + "content": "d ( A ) \\geq \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 536, + 156, + 549 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 156, + 536, + 223, + 549 + ], + "score": 0.89, + "content": "\\| P r o j _ { A ^ { \\bot } } b \\| \\ge \\zeta", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 536, + 248, + 549 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 248, + 536, + 292, + 549 + ], + "score": 0.92, + "content": "\\| v \\| \\leq C _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 536, + 311, + 549 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 312, + 532, + 399, + 547 + ], + "score": 0.91, + "content": "B \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } \\times ( k ^ { 2 } + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 534, + 505, + 548 + ], + "score": 1.0, + "content": "×(k2+1) be the matrix that is the", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 547, + 444, + 560 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 176, + 560 + ], + "score": 1.0, + "content": "concatenation of", + "type": "text" + }, + { + "bbox": [ + 176, + 549, + 184, + 558 + ], + "score": 0.72, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 547, + 203, + 560 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 203, + 550, + 209, + 558 + ], + "score": 0.61, + "content": "v", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 547, + 341, + 560 + ], + "score": 1.0, + "content": ", then the leave-one-out distance", + "type": "text" + }, + { + "bbox": [ + 341, + 547, + 440, + 560 + ], + "score": 0.91, + "content": "d ( B ) \\geq p o l y ( \\zeta , \\delta , 1 / C _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 547, + 444, + 560 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 106, + 569, + 505, + 618 + ], + "lines": [ + { + "bbox": [ + 105, + 568, + 504, + 582 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 434, + 582 + ], + "score": 1.0, + "content": "The proof idea is similar as the proof in Lemma 21. In the proof, we should think of", + "type": "text" + }, + { + "bbox": [ + 435, + 568, + 504, + 581 + ], + "score": 0.9, + "content": "A : = \\hat { H } ^ { \\prime } , v : = b ^ { \\prime }", + "type": "inline_equation" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 581, + 505, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 124, + 595 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 124, + 582, + 162, + 593 + ], + "score": 0.9, + "content": "B : = H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 582, + 194, + 595 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 194, + 582, + 207, + 592 + ], + "score": 0.87, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 582, + 306, + 595 + ], + "score": 1.0, + "content": "is the subset of rows of", + "type": "text" + }, + { + "bbox": [ + 306, + 583, + 317, + 592 + ], + "score": 0.83, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 582, + 365, + 595 + ], + "score": 1.0, + "content": "indexed by", + "type": "text" + }, + { + "bbox": [ + 366, + 582, + 402, + 594 + ], + "score": 0.91, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 582, + 466, + 595 + ], + "score": 1.0, + "content": ". We know that", + "type": "text" + }, + { + "bbox": [ + 466, + 581, + 505, + 595 + ], + "score": 0.9, + "content": "d ( { \\hat { H } } ^ { \\prime } ) \\geq", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 108, + 593, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 108, + 594, + 299, + 606 + ], + "score": 0.79, + "content": "\\delta = \\mathrm { p o l y } ( 1 / d , \\rho ) , \\| \\mathrm { P r o j } _ { A ^ { \\perp } } b \\| \\ge \\zeta = \\mathrm { p o l y } ( 1 / d )", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 593, + 506, + 607 + ], + "score": 1.0, + "content": ". It’s not hard to show that with probability at least", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 107, + 603, + 183, + 619 + ], + "spans": [ + { + "bbox": [ + 107, + 605, + 176, + 618 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 177, + 603, + 183, + 619 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31.5 + }, + { + "type": "interline_equation", + "bbox": [ + 273, + 622, + 337, + 636 + ], + "lines": [ + { + "bbox": [ + 273, + 622, + 337, + 636 + ], + "spans": [ + { + "bbox": [ + 273, + 622, + 337, + 636 + ], + "score": 0.87, + "content": "\\| b ^ { \\prime } \\| \\leq \\mathrm { p o l y } ( d ) .", + "type": "interline_equation", + "image_path": "fdd1156848f38c501b25f82c9387e3f0fb4b519dc81d82b45761259f44b447bd.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 273, + 622, + 337, + 636 + ], + "spans": [], + "index": 34 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 639, + 505, + 677 + ], + "lines": [ + { + "bbox": [ + 105, + 638, + 506, + 653 + ], + "spans": [ + { + "bbox": [ + 105, + 638, + 181, + 653 + ], + "score": 1.0, + "content": "Thus, there exists", + "type": "text" + }, + { + "bbox": [ + 181, + 640, + 240, + 652 + ], + "score": 0.93, + "content": "C _ { 1 } = \\mathrm { p o l y } ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 638, + 284, + 653 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 284, + 640, + 329, + 652 + ], + "score": 0.93, + "content": "\\| b ^ { \\prime } \\| \\leq C _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 638, + 506, + 653 + ], + "score": 1.0, + "content": ". We already proved that the leave-one-out", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 650, + 506, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 650, + 152, + 663 + ], + "score": 1.0, + "content": "distance of", + "type": "text" + }, + { + "bbox": [ + 153, + 651, + 160, + 661 + ], + "score": 0.85, + "content": "b ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 161, + 650, + 172, + 663 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 173, + 651, + 185, + 661 + ], + "score": 0.88, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 650, + 506, + 663 + ], + "score": 1.0, + "content": "is lower bounded. We only need to show the leave-one-out distance for the first", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 662, + 260, + 677 + ], + "spans": [ + { + "bbox": [ + 106, + 663, + 118, + 673 + ], + "score": 0.85, + "content": "k ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 662, + 199, + 677 + ], + "score": 1.0, + "content": "columns, which are", + "type": "text" + }, + { + "bbox": [ + 199, + 662, + 256, + 677 + ], + "score": 0.93, + "content": "\\hat { H } _ { i j } ^ { \\prime } , i , j \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 662, + 260, + 677 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 36 + }, + { + "type": "text", + "bbox": [ + 106, + 682, + 501, + 697 + ], + "lines": [ + { + "bbox": [ + 104, + 682, + 503, + 698 + ], + "spans": [ + { + "bbox": [ + 104, + 682, + 139, + 698 + ], + "score": 1.0, + "content": "For any", + "type": "text" + }, + { + "bbox": [ + 140, + 684, + 176, + 696 + ], + "score": 0.92, + "content": "i , j \\in [ k ]", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 682, + 301, + 698 + ], + "score": 1.0, + "content": ", the leave-one-out distance for", + "type": "text" + }, + { + "bbox": [ + 301, + 682, + 317, + 698 + ], + "score": 0.92, + "content": "\\hat { H } _ { i j } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 682, + 375, + 698 + ], + "score": 1.0, + "content": "within matrix", + "type": "text" + }, + { + "bbox": [ + 375, + 684, + 388, + 694 + ], + "score": 0.86, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 682, + 503, + 698 + ], + "score": 1.0, + "content": "can be expressed as follows", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 38 + }, + { + "type": "interline_equation", + "bbox": [ + 227, + 701, + 383, + 730 + ], + "lines": [ + { + "bbox": [ + 227, + 701, + 383, + 730 + ], + "spans": [ + { + "bbox": [ + 227, + 701, + 383, + 730 + ], + "score": 0.93, + "content": "\\operatorname* { m i n } _ { c _ { k l } , c _ { b } } \\| \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } \\hat { H } _ { k l } ^ { \\prime } + c _ { b } b ^ { \\prime } \\|", + "type": "interline_equation", + "image_path": "a9b65464e6330901fc8b16c19559eb4fe2a28efe0625305eb4d1f945235c70bd.jpg" + } + ] + } + ], + "index": 39, + "virtual_lines": [ + { + "bbox": [ + 227, + 701, + 383, + 730 + ], + "spans": [], + "index": 39 + } + ] + } + ], + "page_idx": 47, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 294, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "48", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 104, + 81, + 489, + 95 + ], + "lines": [ + { + "bbox": [ + 104, + 81, + 489, + 96 + ], + "spans": [ + { + "bbox": [ + 104, + 81, + 115, + 96 + ], + "score": 1.0, + "content": "if", + "type": "text" + }, + { + "bbox": [ + 115, + 82, + 150, + 95 + ], + "score": 0.91, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 81, + 415, + 96 + ], + "score": 1.0, + "content": ". 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We can similarly", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 181, + 320, + 197 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 244, + 197 + ], + "score": 1.0, + "content": "show that with probability at least", + "type": "text" + }, + { + "bbox": [ + 244, + 183, + 313, + 196 + ], + "score": 0.89, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 181, + 320, + 197 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5, + "bbox_fs": [ + 105, + 169, + 505, + 197 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 200, + 366, + 217 + ], + "lines": [ + { + "bbox": [ + 244, + 200, + 366, + 217 + ], + "spans": [ + { + "bbox": [ + 244, + 200, + 366, + 217 + ], + "score": 0.9, + "content": "\\left\\| \\mathrm { P r o j } _ { \\hat { S } ^ { \\perp } } \\hat { H } _ { i i } ^ { \\prime } \\right\\| \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "956200b7cf2d97ead1bc6f8f0467f67de19a5f28fc6a76aa7ff8c1c945848859.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 244, + 200, + 366, + 217 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 228, + 504, + 252 + ], + "lines": [ + { + "bbox": [ + 105, + 226, + 505, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 226, + 406, + 243 + ], + "score": 1.0, + "content": "Thus, by union bound, we know that the leave-one-out distance of matrix", + "type": "text" + }, + { + "bbox": [ + 406, + 227, + 419, + 239 + ], + "score": 0.89, + "content": "{ \\hat { H } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 226, + 505, + 243 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 239, + 163, + 254 + ], + "spans": [ + { + "bbox": [ + 106, + 240, + 158, + 252 + ], + "score": 0.8, + "content": "\\mathrm { p o l y } ( 1 / d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 239, + 163, + 254 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7.5, + "bbox_fs": [ + 105, + 226, + 505, + 254 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 255, + 505, + 304 + ], + "lines": [ + { + "bbox": [ + 104, + 255, + 506, + 270 + ], + "spans": [ + { + "bbox": [ + 104, + 255, + 259, + 270 + ], + "score": 1.0, + "content": "Now, let’s add the additional column", + "type": "text" + }, + { + "bbox": [ + 260, + 256, + 342, + 269 + ], + "score": 0.88, + "content": "\\mathsf { r e c } ( P _ { 1 } P _ { 1 } ^ { \\top } + P _ { 2 } P _ { 2 } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 255, + 506, + 270 + ], + "score": 1.0, + "content": "into consideration. For convenience we", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 267, + 505, + 280 + ], + "spans": [ + { + "bbox": [ + 105, + 267, + 198, + 280 + ], + "score": 1.0, + "content": "denote this column by", + "type": "text" + }, + { + "bbox": [ + 198, + 268, + 204, + 278 + ], + "score": 0.66, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 267, + 346, + 280 + ], + "score": 1.0, + "content": ". We will first prove that the vector", + "type": "text" + }, + { + "bbox": [ + 347, + 268, + 352, + 278 + ], + "score": 0.73, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 267, + 505, + 280 + ], + "score": 1.0, + "content": "has large norm when projected to the", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 279, + 505, + 293 + ], + "spans": [ + { + "bbox": [ + 106, + 280, + 247, + 293 + ], + "score": 1.0, + "content": "orthogonal subspace of columns in", + "type": "text" + }, + { + "bbox": [ + 248, + 279, + 258, + 290 + ], + "score": 0.86, + "content": "\\hat { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 280, + 435, + 293 + ], + "score": 1.0, + "content": ", then we will combine this with the fact that", + "type": "text" + }, + { + "bbox": [ + 435, + 279, + 472, + 293 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( { \\hat { H } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 280, + 505, + 293 + ], + "score": 1.0, + "content": "is large", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 291, + 422, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 292, + 157, + 304 + ], + "score": 1.0, + "content": "to show that", + "type": "text" + }, + { + "bbox": [ + 158, + 291, + 195, + 304 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 292, + 422, + 304 + ], + "score": 1.0, + "content": "is also large (this last step is very similar to Lemma 21).", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 10.5, + "bbox_fs": [ + 104, + 255, + 506, + 304 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 309, + 506, + 381 + ], + "lines": [ + { + "bbox": [ + 106, + 308, + 504, + 322 + ], + "spans": [ + { + "bbox": [ + 106, + 310, + 176, + 322 + ], + "score": 1.0, + "content": "We know matrix", + "type": "text" + }, + { + "bbox": [ + 176, + 308, + 186, + 320 + ], + "score": 0.86, + "content": "\\hat { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 310, + 332, + 322 + ], + "score": 1.0, + "content": "only depends on the randomness of", + "type": "text" + }, + { + "bbox": [ + 333, + 311, + 344, + 321 + ], + "score": 0.88, + "content": "P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 310, + 395, + 322 + ], + "score": 1.0, + "content": ". Thus, with", + "type": "text" + }, + { + "bbox": [ + 395, + 311, + 407, + 321 + ], + "score": 0.88, + "content": "P _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 310, + 493, + 322 + ], + "score": 1.0, + "content": "fixed, all columns in", + "type": "text" + }, + { + "bbox": [ + 494, + 311, + 504, + 320 + ], + "score": 0.8, + "content": "H", + "type": "inline_equation" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 321, + 504, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 321, + 187, + 333 + ], + "score": 1.0, + "content": "are fixed except for", + "type": "text" + }, + { + "bbox": [ + 188, + 322, + 193, + 331 + ], + "score": 0.69, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 321, + 345, + 333 + ], + "score": 1.0, + "content": ". Now, we rely on the randomness in", + "type": "text" + }, + { + "bbox": [ + 345, + 322, + 357, + 333 + ], + "score": 0.88, + "content": "P _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 321, + 498, + 333 + ], + "score": 1.0, + "content": "to show that the distance between", + "type": "text" + }, + { + "bbox": [ + 498, + 322, + 504, + 331 + ], + "score": 0.7, + "content": "b", + "type": "inline_equation" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 333, + 505, + 344 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 240, + 344 + ], + "score": 1.0, + "content": "and the span of other columns in", + "type": "text" + }, + { + "bbox": [ + 241, + 333, + 251, + 342 + ], + "score": 0.83, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 333, + 505, + 344 + ], + "score": 1.0, + "content": "is lower bounded. In order to get ride of the correlation within", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 343, + 505, + 356 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 139, + 356 + ], + "score": 1.0, + "content": "column", + "type": "text" + }, + { + "bbox": [ + 140, + 344, + 144, + 353 + ], + "score": 0.75, + "content": "b", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 343, + 375, + 356 + ], + "score": 1.0, + "content": ", we also need to consider a subset of its rows indexed by", + "type": "text" + }, + { + "bbox": [ + 375, + 344, + 411, + 355 + ], + "score": 0.92, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 343, + 461, + 356 + ], + "score": 1.0, + "content": ", denoted by", + "type": "text" + }, + { + "bbox": [ + 462, + 343, + 470, + 353 + ], + "score": 0.84, + "content": "b ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 343, + 505, + 356 + ], + "score": 1.0, + "content": ". Let the", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 353, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 168, + 370 + ], + "score": 1.0, + "content": "first column of", + "type": "text" + }, + { + "bbox": [ + 169, + 356, + 181, + 367 + ], + "score": 0.88, + "content": "P _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 353, + 194, + 370 + ], + "score": 1.0, + "content": "be", + "type": "text" + }, + { + "bbox": [ + 194, + 354, + 236, + 367 + ], + "score": 0.92, + "content": "p \\in \\mathbb { R } ^ { d - k }", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 353, + 441, + 370 + ], + "score": 1.0, + "content": ", and the submatrix consisting of other columns be", + "type": "text" + }, + { + "bbox": [ + 441, + 354, + 452, + 367 + ], + "score": 0.89, + "content": "\\hat { P } _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 453, + 353, + 474, + 370 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 474, + 356, + 491, + 369 + ], + "score": 0.91, + "content": "S _ { \\hat { H } ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 492, + 353, + 506, + 370 + ], + "score": 1.0, + "content": "be", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 368, + 219, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 369, + 185, + 381 + ], + "score": 1.0, + "content": "the column span of", + "type": "text" + }, + { + "bbox": [ + 185, + 368, + 198, + 379 + ], + "score": 0.89, + "content": "{ \\hat { H } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 369, + 219, + 381 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 308, + 506, + 381 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 196, + 385, + 414, + 402 + ], + "lines": [ + { + "bbox": [ + 196, + 385, + 414, + 402 + ], + "spans": [ + { + "bbox": [ + 196, + 385, + 414, + 402 + ], + "score": 0.88, + "content": "\\hat { S } _ { \\hat { H } ^ { \\prime } } = S _ { \\hat { H } ^ { \\prime } } \\cup S _ { C ^ { \\prime } } \\cup \\mathrm { s p a n } ( \\mathrm { v e c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } ) ^ { \\prime } , \\mathrm { v e c } ( P _ { 2 } P _ { 2 } ^ { \\top } ) ^ { \\prime } ) ,", + "type": "interline_equation", + "image_path": "fcb7ede60f457131802d9d05d060bb89ee3d9f5d7128602088bea5bf19cc29b6.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 196, + 385, + 414, + 402 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 406, + 505, + 433 + ], + "lines": [ + { + "bbox": [ + 106, + 404, + 505, + 421 + ], + "spans": [ + { + "bbox": [ + 106, + 404, + 133, + 421 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 406, + 184, + 420 + ], + "score": 0.9, + "content": "\\mathsf { v e c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } ) ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 404, + 273, + 421 + ], + "score": 1.0, + "content": "is the restriction of ve", + "type": "text" + }, + { + "bbox": [ + 273, + 406, + 310, + 420 + ], + "score": 0.71, + "content": "\\mathsf { c } ( \\hat { P } _ { 1 } \\hat { P } _ { 1 } ^ { \\top } )", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 404, + 403, + 421 + ], + "score": 1.0, + "content": "to the rows indexed by", + "type": "text" + }, + { + "bbox": [ + 404, + 408, + 439, + 419 + ], + "score": 0.92, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 404, + 505, + 421 + ], + "score": 1.0, + "content": ". The dimension", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 417, + 443, + 435 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 117, + 435 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 419, + 135, + 433 + ], + "score": 0.92, + "content": "\\hat { S } _ { \\hat { H } ^ { \\prime } }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 417, + 177, + 435 + ], + "score": 1.0, + "content": "is at most", + "type": "text" + }, + { + "bbox": [ + 177, + 420, + 308, + 433 + ], + "score": 0.91, + "content": "k ^ { 2 } + k ^ { 2 } + 1 + 2 \\leq ( d - k ) ^ { 2 } / 1 2", + "type": "inline_equation" + }, + { + "bbox": [ + 308, + 417, + 369, + 435 + ], + "score": 1.0, + "content": ", assuming that", + "type": "text" + }, + { + "bbox": [ + 369, + 421, + 405, + 433 + ], + "score": 0.92, + "content": "k \\leq d / 7", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 417, + 443, + 435 + ], + "score": 1.0, + "content": ". Clearly,", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20.5, + "bbox_fs": [ + 105, + 404, + 505, + 435 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 241, + 437, + 368, + 475 + ], + "lines": [ + { + "bbox": [ + 241, + 437, + 368, + 475 + ], + "spans": [ + { + "bbox": [ + 241, + 437, + 368, + 475 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\mathrm { P r o j } _ { S _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } b ^ { \\prime } \\geq \\mathrm { P r o j } _ { \\hat { S } _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } b ^ { \\prime } } \\\\ & { \\qquad = \\mathrm { P r o j } _ { \\hat { S } _ { \\hat { H } ^ { \\prime } } ^ { \\perp } } p _ { L _ { 1 } } \\otimes p _ { L _ { 2 } } , } \\end{array}", + "type": "interline_equation", + "image_path": "ee004e3c8ee7615c0c4b76303eb92f90b1b3ac75aeb82f154373186d62615a93.jpg" + } + ] + } + ], + "index": 22.5, + "virtual_lines": [ + { + "bbox": [ + 241, + 437, + 368, + 456.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 241, + 456.0, + 368, + 475.0 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 478, + 505, + 513 + ], + "lines": [ + { + "bbox": [ + 106, + 477, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 106, + 477, + 133, + 491 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 480, + 146, + 489 + ], + "score": 0.85, + "content": "p _ { L }", + "type": "inline_equation" + }, + { + "bbox": [ + 146, + 477, + 226, + 491 + ], + "score": 1.0, + "content": "is the restriction of", + "type": "text" + }, + { + "bbox": [ + 227, + 480, + 233, + 489 + ], + "score": 0.82, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 477, + 314, + 491 + ], + "score": 1.0, + "content": "to rows indexed by", + "type": "text" + }, + { + "bbox": [ + 315, + 479, + 322, + 488 + ], + "score": 0.79, + "content": "L", + "type": "inline_equation" + }, + { + "bbox": [ + 323, + 477, + 368, + 491 + ], + "score": 1.0, + "content": ". Note that", + "type": "text" + }, + { + "bbox": [ + 368, + 480, + 384, + 490 + ], + "score": 0.88, + "content": "p _ { L _ { 1 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 477, + 403, + 491 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 403, + 480, + 419, + 490 + ], + "score": 0.87, + "content": "p _ { L _ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 477, + 505, + 491 + ], + "score": 1.0, + "content": "are two independent", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 489, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 487, + 501 + ], + "score": 1.0, + "content": "standard Gaussian vectors. Thus, according to Lemma 31, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 487, + 489, + 505, + 500 + ], + "score": 0.74, + "content": "1 -", + "type": "inline_equation" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 500, + 454, + 515 + ], + "spans": [ + { + "bbox": [ + 106, + 500, + 159, + 514 + ], + "score": 0.92, + "content": "\\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 500, + 249, + 515 + ], + "score": 1.0, + "content": ", the distance between", + "type": "text" + }, + { + "bbox": [ + 249, + 501, + 257, + 511 + ], + "score": 0.85, + "content": "b ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 500, + 354, + 515 + ], + "score": 1.0, + "content": "and the column span of", + "type": "text" + }, + { + "bbox": [ + 354, + 500, + 367, + 511 + ], + "score": 0.89, + "content": "{ \\hat { H } } ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 500, + 427, + 515 + ], + "score": 1.0, + "content": "is at least poly", + "type": "text" + }, + { + "bbox": [ + 428, + 501, + 450, + 514 + ], + "score": 0.62, + "content": "( 1 / d )", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 500, + 454, + 515 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25, + "bbox_fs": [ + 106, + 477, + 505, + 515 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 516, + 505, + 560 + ], + "lines": [ + { + "bbox": [ + 105, + 516, + 506, + 533 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 210, + 532 + ], + "score": 1.0, + "content": "Claim 3. For any matrix", + "type": "text" + }, + { + "bbox": [ + 210, + 516, + 278, + 531 + ], + "score": 0.92, + "content": "A \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } \\times k ^ { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 517, + 333, + 533 + ], + "score": 1.0, + "content": "and a vector", + "type": "text" + }, + { + "bbox": [ + 333, + 516, + 384, + 531 + ], + "score": 0.9, + "content": "v \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 520, + 506, + 533 + ], + "score": 1.0, + "content": ", if the leave-one-out distance", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 107, + 532, + 505, + 549 + ], + "spans": [ + { + "bbox": [ + 107, + 536, + 150, + 549 + ], + "score": 0.82, + "content": "d ( A ) \\geq \\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 536, + 156, + 549 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 156, + 536, + 223, + 549 + ], + "score": 0.89, + "content": "\\| P r o j _ { A ^ { \\bot } } b \\| \\ge \\zeta", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 536, + 248, + 549 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 248, + 536, + 292, + 549 + ], + "score": 0.92, + "content": "\\| v \\| \\leq C _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 536, + 311, + 549 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 312, + 532, + 399, + 547 + ], + "score": 0.91, + "content": "B \\in \\mathbb { R } ^ { \\frac { ( d - k ) ^ { 2 } } { 4 } \\times ( k ^ { 2 } + 1 ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 534, + 505, + 548 + ], + "score": 1.0, + "content": "×(k2+1) be the matrix that is the", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 547, + 444, + 560 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 176, + 560 + ], + "score": 1.0, + "content": "concatenation of", + "type": "text" + }, + { + "bbox": [ + 176, + 549, + 184, + 558 + ], + "score": 0.72, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 547, + 203, + 560 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 203, + 550, + 209, + 558 + ], + "score": 0.61, + "content": "v", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 547, + 341, + 560 + ], + "score": 1.0, + "content": ", then the leave-one-out distance", + "type": "text" + }, + { + "bbox": [ + 341, + 547, + 440, + 560 + ], + "score": 0.91, + "content": "d ( B ) \\geq p o l y ( \\zeta , \\delta , 1 / C _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 547, + 444, + 560 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28, + "bbox_fs": [ + 105, + 516, + 506, + 560 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 569, + 505, + 618 + ], + "lines": [ + { + "bbox": [ + 105, + 568, + 504, + 582 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 434, + 582 + ], + "score": 1.0, + "content": "The proof idea is similar as the proof in Lemma 21. In the proof, we should think of", + "type": "text" + }, + { + "bbox": [ + 435, + 568, + 504, + 581 + ], + "score": 0.9, + "content": "A : = \\hat { H } ^ { \\prime } , v : = b ^ { \\prime }", + "type": "inline_equation" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 581, + 505, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 124, + 595 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 124, + 582, + 162, + 593 + ], + "score": 0.9, + "content": "B : = H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 582, + 194, + 595 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 194, + 582, + 207, + 592 + ], + "score": 0.87, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 208, + 582, + 306, + 595 + ], + "score": 1.0, + "content": "is the subset of rows of", + "type": "text" + }, + { + "bbox": [ + 306, + 583, + 317, + 592 + ], + "score": 0.83, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 582, + 365, + 595 + ], + "score": 1.0, + "content": "indexed by", + "type": "text" + }, + { + "bbox": [ + 366, + 582, + 402, + 594 + ], + "score": 0.91, + "content": "L _ { 1 } \\times L _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 582, + 466, + 595 + ], + "score": 1.0, + "content": ". We know that", + "type": "text" + }, + { + "bbox": [ + 466, + 581, + 505, + 595 + ], + "score": 0.9, + "content": "d ( { \\hat { H } } ^ { \\prime } ) \\geq", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 108, + 593, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 108, + 594, + 299, + 606 + ], + "score": 0.79, + "content": "\\delta = \\mathrm { p o l y } ( 1 / d , \\rho ) , \\| \\mathrm { P r o j } _ { A ^ { \\perp } } b \\| \\ge \\zeta = \\mathrm { p o l y } ( 1 / d )", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 593, + 506, + 607 + ], + "score": 1.0, + "content": ". It’s not hard to show that with probability at least", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 107, + 603, + 183, + 619 + ], + "spans": [ + { + "bbox": [ + 107, + 605, + 176, + 618 + ], + "score": 0.9, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 177, + 603, + 183, + 619 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31.5, + "bbox_fs": [ + 105, + 568, + 506, + 619 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 273, + 622, + 337, + 636 + ], + "lines": [ + { + "bbox": [ + 273, + 622, + 337, + 636 + ], + "spans": [ + { + "bbox": [ + 273, + 622, + 337, + 636 + ], + "score": 0.87, + "content": "\\| b ^ { \\prime } \\| \\leq \\mathrm { p o l y } ( d ) .", + "type": "interline_equation", + "image_path": "fdd1156848f38c501b25f82c9387e3f0fb4b519dc81d82b45761259f44b447bd.jpg" + } + ] + } + ], + "index": 34, + "virtual_lines": [ + { + "bbox": [ + 273, + 622, + 337, + 636 + ], + "spans": [], + "index": 34 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 639, + 505, + 677 + ], + "lines": [ + { + "bbox": [ + 105, + 638, + 506, + 653 + ], + "spans": [ + { + "bbox": [ + 105, + 638, + 181, + 653 + ], + "score": 1.0, + "content": "Thus, there exists", + "type": "text" + }, + { + "bbox": [ + 181, + 640, + 240, + 652 + ], + "score": 0.93, + "content": "C _ { 1 } = \\mathrm { p o l y } ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 638, + 284, + 653 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 284, + 640, + 329, + 652 + ], + "score": 0.93, + "content": "\\| b ^ { \\prime } \\| \\leq C _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 638, + 506, + 653 + ], + "score": 1.0, + "content": ". We already proved that the leave-one-out", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 650, + 506, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 650, + 152, + 663 + ], + "score": 1.0, + "content": "distance of", + "type": "text" + }, + { + "bbox": [ + 153, + 651, + 160, + 661 + ], + "score": 0.85, + "content": "b ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 161, + 650, + 172, + 663 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 173, + 651, + 185, + 661 + ], + "score": 0.88, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 650, + 506, + 663 + ], + "score": 1.0, + "content": "is lower bounded. 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| | c _ { b } ^ { * } b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq \\operatorname* { m i n } _ { c _ { k l } } | | \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } \\hat { H } _ { k l } ^ { \\prime } | | - | c _ { b } ^ { * } | | | b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq \\delta - \\frac { \\delta } { 2 C _ { 1 } } C _ { 1 } } } \\\\ { { \\displaystyle = \\delta / 2 . } } \\end{array}", + "type": "interline_equation", + "image_path": "f5ff17adbee9e0ef9696f287239be0b63cbfa5927f90876a09d6b86a09349b23.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 216, + 408, + 394, + 422.55555555555554 + ], + "spans": [], + "index": 15 + }, + { + "bbox": [ + 216, + 422.55555555555554, + 394, + 437.1111111111111 + ], + "spans": [], + "index": 16 + }, + { + "bbox": [ + 216, + 437.1111111111111, + 394, + 451.66666666666663 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 216, + 451.66666666666663, + 394, + 466.2222222222222 + ], + "spans": [], + "index": 18 + }, + { + "bbox": [ + 216, + 466.2222222222222, + 394, + 480.7777777777777 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 216, + 480.7777777777777, + 394, + 495.33333333333326 + ], + "spans": [], + "index": 20 + }, + { + "bbox": [ + 216, + 495.33333333333326, + 394, + 509.8888888888888 + ], + "spans": [], + "index": 21 + }, + { + "bbox": [ + 216, + 509.8888888888888, + 394, + 524.4444444444443 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 216, + 524.4444444444443, + 394, + 538.9999999999999 + ], + "spans": [], + "index": 23 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 549, + 505, + 584 + ], + "lines": [ + { + "bbox": [ + 106, + 549, + 505, + 562 + ], + "spans": [ + { + "bbox": [ + 106, + 549, + 256, + 562 + ], + "score": 1.0, + "content": "Thus, the leave-one-out distance of", + "type": "text" + }, + { + "bbox": [ + 257, + 550, + 270, + 560 + ], + "score": 0.88, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 549, + 362, + 562 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + }, + { + "bbox": [ + 363, + 550, + 427, + 562 + ], + "score": 0.88, + "content": "\\mathrm { p o l y } ( \\zeta , \\delta , 1 / C _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 549, + 505, + 562 + ], + "score": 1.0, + "content": ". Recall that with", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 104, + 560, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 104, + 560, + 185, + 576 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 186, + 561, + 257, + 574 + ], + "score": 0.92, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 560, + 299, + 576 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 299, + 562, + 501, + 574 + ], + "score": 0.85, + "content": "\\delta = \\mathrm { p o l y } ( 1 / d , \\rho ) , \\zeta = \\mathrm { p o l y } ( 1 / d ) , C _ { 1 } = \\mathrm { p o l y } ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 560, + 506, + 576 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 571, + 168, + 586 + ], + "spans": [ + { + "bbox": [ + 106, + 571, + 168, + 586 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25 + }, + { + "type": "interline_equation", + "bbox": [ + 258, + 584, + 352, + 599 + ], + "lines": [ + { + "bbox": [ + 258, + 584, + 352, + 599 + ], + "spans": [ + { + "bbox": [ + 258, + 584, + 352, + 599 + ], + "score": 0.88, + "content": "d ( H ^ { \\prime } ) \\geq \\operatorname { p o l y } ( 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "598d578bd74795c34e090f68428b4c79a9de0eb577d7106d68da40aab9912cba.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 258, + 584, + 352, + 599 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 602, + 244, + 613 + ], + "lines": [ + { + "bbox": [ + 106, + 601, + 244, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 601, + 244, + 615 + ], + "score": 1.0, + "content": "According to Lemma 20, we have", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "interline_equation", + "bbox": [ + 248, + 619, + 363, + 661 + ], + "lines": [ + { + "bbox": [ + 248, + 619, + 363, + 661 + ], + "spans": [ + { + "bbox": [ + 248, + 619, + 363, + 661 + ], + "score": 0.93, + "content": "\\begin{array} { c c c } { \\displaystyle { \\sigma _ { \\operatorname* { m i n } } ( H ^ { \\prime } ) \\geq \\frac { 1 } { \\sqrt { k ^ { 2 } + 1 } } d ( H ^ { \\prime } ) } } \\\\ { \\displaystyle { \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) . } } \\end{array}", + "type": "interline_equation", + "image_path": "7d55cd7ec6e39aeafa32ad88c6ae6b5f649f9b4541f5526cdf90ea30e6d72fa5.jpg" + } + ] + } + ], + "index": 29.5, + "virtual_lines": [ + { + "bbox": [ + 248, + 619, + 363, + 640.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 248, + 640.0, + 363, + 661.0 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 671, + 505, + 696 + ], + "lines": [ + { + "bbox": [ + 105, + 670, + 505, + 686 + ], + "spans": [ + { + "bbox": [ + 105, + 670, + 273, + 686 + ], + "score": 1.0, + "content": "Finally, we put everything together. 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\\prime } | | - | | c _ { b } ^ { * } b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq \\operatorname* { m i n } _ { c _ { k l } } | | \\hat { H } _ { i j } ^ { \\prime } + \\sum _ { ( k , l ) \\neq ( i , j ) } c _ { k l } \\hat { H } _ { k l } ^ { \\prime } | | - | c _ { b } ^ { * } | | | b ^ { \\prime } | | } } \\\\ { { \\displaystyle \\geq \\delta - \\frac { \\delta } { 2 C _ { 1 } } C _ { 1 } } } \\\\ { { \\displaystyle = \\delta / 2 . } } \\end{array}", + "type": "interline_equation", + "image_path": "f5ff17adbee9e0ef9696f287239be0b63cbfa5927f90876a09d6b86a09349b23.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 216, + 408, + 394, + 422.55555555555554 + ], + "spans": [], + "index": 15 + }, + { + "bbox": [ + 216, + 422.55555555555554, + 394, + 437.1111111111111 + ], + "spans": [], + "index": 16 + }, + { + "bbox": [ + 216, + 437.1111111111111, + 394, + 451.66666666666663 + ], + "spans": [], + "index": 17 + }, + { + "bbox": [ + 216, + 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"content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 549, + 362, + 562 + ], + "score": 1.0, + "content": "is lower bounded by", + "type": "text" + }, + { + "bbox": [ + 363, + 550, + 427, + 562 + ], + "score": 0.88, + "content": "\\mathrm { p o l y } ( \\zeta , \\delta , 1 / C _ { 1 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 549, + 505, + 562 + ], + "score": 1.0, + "content": ". Recall that with", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 104, + 560, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 104, + 560, + 185, + 576 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 186, + 561, + 257, + 574 + ], + "score": 0.92, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 560, + 299, + 576 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + }, + { + "bbox": [ + 299, + 562, + 501, + 574 + ], + "score": 0.85, + "content": "\\delta = \\mathrm { p o l y } ( 1 / d , \\rho ) , \\zeta = \\mathrm { p o l y } ( 1 / d ) , C _ { 1 } = \\mathrm { p o l y } ( d )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 560, + 506, + 576 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 571, + 168, + 586 + ], + "spans": [ + { + "bbox": [ + 106, + 571, + 168, + 586 + ], + "score": 1.0, + "content": "Thus, we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25, + "bbox_fs": [ + 104, + 549, + 506, + 586 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 258, + 584, + 352, + 599 + ], + "lines": [ + { + "bbox": [ + 258, + 584, + 352, + 599 + ], + "spans": [ + { + "bbox": [ + 258, + 584, + 352, + 599 + ], + "score": 0.88, + "content": "d ( H ^ { \\prime } ) \\geq \\operatorname { p o l y } ( 1 / d , \\rho ) .", + "type": "interline_equation", + "image_path": "598d578bd74795c34e090f68428b4c79a9de0eb577d7106d68da40aab9912cba.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 258, + 584, + 352, + 599 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 602, + 244, + 613 + ], + "lines": [ + { + "bbox": [ + 106, + 601, + 244, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 601, + 244, + 615 + ], + "score": 1.0, + "content": "According to Lemma 20, we have", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28, + "bbox_fs": [ + 106, + 601, + 244, + 615 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 248, + 619, + 363, + 661 + ], + "lines": [ + { + "bbox": [ + 248, + 619, + 363, + 661 + ], + "spans": [ + { + "bbox": [ + 248, + 619, + 363, + 661 + ], + "score": 0.93, + "content": "\\begin{array} { c c c } { \\displaystyle { \\sigma _ { \\operatorname* { m i n } } ( H ^ { \\prime } ) \\geq \\frac { 1 } { \\sqrt { k ^ { 2 } + 1 } } d ( H ^ { \\prime } ) } } \\\\ { \\displaystyle { \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) . } } \\end{array}", + "type": "interline_equation", + "image_path": "7d55cd7ec6e39aeafa32ad88c6ae6b5f649f9b4541f5526cdf90ea30e6d72fa5.jpg" + } + ] + } + ], + "index": 29.5, + "virtual_lines": [ + { + "bbox": [ + 248, + 619, + 363, + 640.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 248, + 640.0, + 363, + 661.0 + ], + "spans": [], + "index": 30 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 671, + 505, + 696 + ], + "lines": [ + { + "bbox": [ + 105, + 670, + 505, + 686 + ], + "spans": [ + { + "bbox": [ + 105, + 670, + 273, + 686 + ], + "score": 1.0, + "content": "Finally, we put everything together. Since", + "type": "text" + }, + { + "bbox": [ + 273, + 672, + 286, + 682 + ], + "score": 0.88, + "content": "H ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 670, + 456, + 686 + ], + "score": 1.0, + "content": "is a full column rank matrix, we know that", + "type": "text" + }, + { + "bbox": [ + 456, + 672, + 505, + 684 + ], + "score": 0.9, + "content": "\\sigma _ { \\mathrm { m i n } } ( H ) \\geq", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 684, + 494, + 697 + ], + "spans": [ + { + "bbox": [ + 106, + 684, + 210, + 697 + ], + "score": 0.9, + "content": "\\sigma _ { \\operatorname* { m i n } } ( H ^ { \\prime } ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho )", + "type": "inline_equation" + }, + { + "bbox": [ + 210, + 684, + 419, + 697 + ], + "score": 1.0, + "content": ". By union bound, we know with probability at least", + "type": "text" + }, + { + "bbox": [ + 420, + 684, + 489, + 696 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 684, + 494, + 697 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5, + "bbox_fs": [ + 105, + 670, + 505, + 697 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 244, + 702, + 366, + 731 + ], + "lines": [ + { + "bbox": [ + 244, + 702, + 366, + 731 + ], + "spans": [ + { + "bbox": [ + 244, + 702, + 366, + 731 + ], + "score": 0.9, + "content": "\\begin{array} { l } { \\sigma _ { \\operatorname* { m i n } } ( H ) \\geq \\mathrm { p o l y } ( 1 / d , \\rho ) } \\\\ { \\sigma _ { \\operatorname* { m i n } } ( R ) \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho ) . } \\end{array}", + "type": "interline_equation", + "image_path": "c45958f5607d6dd36cfdb3b2d5ab9127609917aa3c7c3aa4fe87ace8f3f16b7b.jpg" + } + ] + } + ], + "index": 33, + "virtual_lines": [ + { + "bbox": [ + 244, + 702, + 366, + 731 + ], + "spans": [], + "index": 33 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 504, + 106 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 131, + 95 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 131, + 83, + 140, + 93 + ], + "score": 0.79, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 81, + 283, + 95 + ], + "score": 1.0, + "content": "is an orthonormal matrix, we know", + "type": "text" + }, + { + "bbox": [ + 283, + 82, + 357, + 95 + ], + "score": 0.94, + "content": "\\sigma _ { \\mathrm { m i n } } ( U \\otimes U ) = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 81, + 505, + 95 + ], + "score": 1.0, + "content": ". According to Eq. 19, we know with", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 257, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 183, + 107 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 93, + 253, + 107 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 93, + 257, + 107 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "interline_equation", + "bbox": [ + 209, + 109, + 402, + 153 + ], + "lines": [ + { + "bbox": [ + 209, + 109, + 402, + 153 + ], + "spans": [ + { + "bbox": [ + 209, + 109, + 402, + 153 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq \\sigma _ { \\operatorname* { m i n } } ( \\lambda U \\otimes U H R ) } \\\\ & { \\qquad \\geq \\lambda \\sigma _ { \\operatorname* { m i n } } ( U \\otimes U ) \\sigma _ { \\operatorname* { m i n } } ( H ) \\sigma _ { \\operatorname* { m i n } } ( R ) } \\\\ & { \\qquad \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho , \\lambda ) } \\end{array}", + "type": "interline_equation", + "image_path": "dd4a55afb1b3eab5c3f0cb6962e6057bbf72c559c1b38a5d938add94d0d3f796.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 209, + 109, + 402, + 123.66666666666667 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 209, + 123.66666666666667, + 402, + 138.33333333333334 + ], + "spans": [], + "index": 3 + }, + { + "bbox": [ + 209, + 138.33333333333334, + 402, + 153.0 + ], + "spans": [], + "index": 4 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 154, + 453, + 167 + ], + "lines": [ + { + "bbox": [ + 105, + 154, + 455, + 167 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 291, + 167 + ], + "score": 1.0, + "content": "where the second inequality holds since all of", + "type": "text" + }, + { + "bbox": [ + 291, + 155, + 320, + 165 + ], + "score": 0.82, + "content": "U \\otimes U", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 154, + 324, + 167 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 324, + 155, + 334, + 165 + ], + "score": 0.77, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 154, + 352, + 167 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 352, + 155, + 361, + 164 + ], + "score": 0.83, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 154, + 455, + 167 + ], + "score": 1.0, + "content": "have full column rank.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 5 + }, + { + "type": "title", + "bbox": [ + 106, + 181, + 164, + 194 + ], + "lines": [ + { + "bbox": [ + 105, + 179, + 166, + 198 + ], + "spans": [ + { + "bbox": [ + 105, + 179, + 166, + 198 + ], + "score": 1.0, + "content": "D TOOLS", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 106, + 205, + 505, + 251 + ], + "lines": [ + { + "bbox": [ + 105, + 206, + 505, + 218 + ], + "spans": [ + { + "bbox": [ + 105, + 206, + 505, + 218 + ], + "score": 1.0, + "content": "In this section, we collect some known results on matrix perturbations and concentration bounds.", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 217, + 505, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 505, + 229 + ], + "score": 1.0, + "content": "Basically, we used matrix concentration bounds to do the robust analysis and used matrix perturba-", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 227, + 506, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 227, + 506, + 240 + ], + "score": 1.0, + "content": "tion bounds to do the smoothed analysis. We also proved several corollaries that are useful in our", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 237, + 139, + 253 + ], + "spans": [ + { + "bbox": [ + 104, + 237, + 139, + 253 + ], + "score": 1.0, + "content": "setting.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5 + }, + { + "type": "title", + "bbox": [ + 108, + 262, + 286, + 275 + ], + "lines": [ + { + "bbox": [ + 106, + 262, + 287, + 276 + ], + "spans": [ + { + "bbox": [ + 106, + 262, + 287, + 276 + ], + "score": 1.0, + "content": "D.1 MATRIX CONCENTRATION BOUNDS", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 283, + 504, + 307 + ], + "lines": [ + { + "bbox": [ + 106, + 283, + 505, + 296 + ], + "spans": [ + { + "bbox": [ + 106, + 283, + 505, + 296 + ], + "score": 1.0, + "content": "Matrix concentration bounds tell us that with enough number of independent samples, the empirical", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 295, + 371, + 307 + ], + "spans": [ + { + "bbox": [ + 106, + 295, + 371, + 307 + ], + "score": 1.0, + "content": "mean of a random matrix can converge to the mean of this matrix.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12.5 + }, + { + "type": "text", + "bbox": [ + 107, + 308, + 504, + 331 + ], + "lines": [ + { + "bbox": [ + 105, + 307, + 506, + 321 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 470, + 321 + ], + "score": 1.0, + "content": "Lemma 23 (Matrix Bernstein; Theorem 1.6 in Tropp (2012)). Consider a finite sequence", + "type": "text" + }, + { + "bbox": [ + 471, + 308, + 493, + 321 + ], + "score": 0.91, + "content": "\\{ Z _ { k } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 307, + 506, + 321 + ], + "score": 1.0, + "content": "of", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 319, + 499, + 332 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 293, + 332 + ], + "score": 1.0, + "content": "independent, random matrices with dimension", + "type": "text" + }, + { + "bbox": [ + 294, + 320, + 326, + 331 + ], + "score": 0.91, + "content": "d \\sb { 1 } \\times d \\sb { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 319, + 499, + 332 + ], + "score": 1.0, + "content": ". Assume that each random matrix satisfies", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14.5 + }, + { + "type": "text", + "bbox": [ + 106, + 349, + 135, + 360 + ], + "lines": [ + { + "bbox": [ + 106, + 349, + 135, + 360 + ], + "spans": [], + "index": 16 + } + ], + "index": 16 + }, + { + "type": "interline_equation", + "bbox": [ + 205, + 358, + 405, + 386 + ], + "lines": [ + { + "bbox": [ + 205, + 358, + 405, + 386 + ], + "spans": [ + { + "bbox": [ + 205, + 358, + 405, + 386 + ], + "score": 0.89, + "content": "\\sigma ^ { 2 } : = \\operatorname* { m a x } \\Big \\{ \\big \\| \\sum _ { k } \\mathbb { E } [ Z _ { k } Z _ { k } ^ { * } ] \\big \\| , \\big \\| \\sum _ { k } \\mathbb { E } [ Z _ { k } ^ { * } Z _ { k } ] \\big \\| \\Big \\} .", + "type": "interline_equation", + "image_path": "4364cf432fe55a9c195132ec7a45b6119cf9cfc46c65088fd4e62535ed14411f.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 205, + 358, + 405, + 386 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 386, + 184, + 398 + ], + "lines": [ + { + "bbox": [ + 105, + 384, + 185, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 158, + 399 + ], + "score": 1.0, + "content": "Then, for all", + "type": "text" + }, + { + "bbox": [ + 159, + 387, + 181, + 397 + ], + "score": 0.88, + "content": "t \\geq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 384, + 185, + 399 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "interline_equation", + "bbox": [ + 196, + 400, + 414, + 430 + ], + "lines": [ + { + "bbox": [ + 196, + 400, + 414, + 430 + ], + "spans": [ + { + "bbox": [ + 196, + 400, + 414, + 430 + ], + "score": 0.91, + "content": "\\operatorname* { P r } \\Big \\{ \\Big \\| \\sum _ { k } Z _ { k } \\Big \\| \\geq t \\Big \\} \\leq ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { \\sigma ^ { 2 } + R t / 3 } \\Big ) .", + "type": "interline_equation", + "image_path": "bc6c133d4dcec2a99381de075a95422e73ff5350555be96f5171fca65e9e08ae.jpg" + } + ] + } + ], + "index": 19.5, + "virtual_lines": [ + { + "bbox": [ + 196, + 400, + 414, + 415.0 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 196, + 415.0, + 414, + 430.0 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 438, + 204, + 450 + ], + "lines": [ + { + "bbox": [ + 106, + 437, + 205, + 452 + ], + "spans": [ + { + "bbox": [ + 106, + 437, + 205, + 452 + ], + "score": 1.0, + "content": "As a corollary, we have:", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 106, + 452, + 504, + 475 + ], + "lines": [ + { + "bbox": [ + 105, + 451, + 506, + 465 + ], + "spans": [ + { + "bbox": [ + 105, + 451, + 275, + 465 + ], + "score": 1.0, + "content": "Lemma 24. Consider a finite sequence", + "type": "text" + }, + { + "bbox": [ + 275, + 452, + 343, + 464 + ], + "score": 0.93, + "content": "\\{ Z _ { 1 } , Z _ { 2 } \\cdot \\cdot \\cdot Z _ { m } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 451, + 506, + 465 + ], + "score": 1.0, + "content": "of independent, random matrices with", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 462, + 355, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 462, + 150, + 476 + ], + "score": 1.0, + "content": "dimension", + "type": "text" + }, + { + "bbox": [ + 150, + 463, + 182, + 474 + ], + "score": 0.91, + "content": "d _ { 1 } \\times d _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 462, + 355, + 476 + ], + "score": 1.0, + "content": ". Assume that each random matrix satisfies", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 22.5 + }, + { + "type": "interline_equation", + "bbox": [ + 255, + 477, + 355, + 490 + ], + "lines": [ + { + "bbox": [ + 255, + 477, + 355, + 490 + ], + "spans": [ + { + "bbox": [ + 255, + 477, + 355, + 490 + ], + "score": 0.89, + "content": "\\left\\| Z _ { k } \\right\\| \\le R , 1 \\le k \\le m .", + "type": "interline_equation", + "image_path": "195f78f69dcdc5b153ed3af5aaa8e692c001d313315bc0db6e9d62b8f71705eb.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 255, + 477, + 355, + 490 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 492, + 185, + 504 + ], + "lines": [ + { + "bbox": [ + 105, + 491, + 186, + 505 + ], + "spans": [ + { + "bbox": [ + 105, + 491, + 158, + 505 + ], + "score": 1.0, + "content": "Then, for all", + "type": "text" + }, + { + "bbox": [ + 159, + 493, + 181, + 504 + ], + "score": 0.86, + "content": "t \\geq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 491, + 186, + 505 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "interline_equation", + "bbox": [ + 161, + 506, + 450, + 538 + ], + "lines": [ + { + "bbox": [ + 161, + 506, + 450, + 538 + ], + "spans": [ + { + "bbox": [ + 161, + 506, + 450, + 538 + ], + "score": 0.94, + "content": "\\operatorname* { P r } \\Big \\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } - \\mathbb { E } [ Z _ { k } ] ) \\big \\| \\ge t \\Big \\} \\le ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \\Big ) .", + "type": "interline_equation", + "image_path": "5ca5ee813f840411fab51b7145825f544c0b0f658487dc24880b3eae62b8eb72.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 161, + 506, + 450, + 516.6666666666666 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 161, + 516.6666666666666, + 450, + 527.3333333333333 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 161, + 527.3333333333333, + 450, + 537.9999999999999 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 549, + 505, + 573 + ], + "lines": [ + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 173, + 563 + ], + "score": 1.0, + "content": "Proof. For each", + "type": "text" + }, + { + "bbox": [ + 173, + 551, + 180, + 560 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 549, + 196, + 563 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 196, + 550, + 270, + 562 + ], + "score": 0.93, + "content": "Z _ { k } ^ { \\prime } = Z _ { k } - \\mathbb { E } [ Z _ { k } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 549, + 443, + 563 + ], + "score": 1.0, + "content": "be the new random matrices. It’s clear that", + "type": "text" + }, + { + "bbox": [ + 444, + 550, + 487, + 562 + ], + "score": 0.93, + "content": "\\mathbb { E } [ Z _ { k } ^ { \\prime } ] = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 549, + 506, + 563 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 107, + 560, + 230, + 574 + ], + "spans": [ + { + "bbox": [ + 107, + 561, + 155, + 573 + ], + "score": 0.92, + "content": "\\| Z _ { k } ^ { \\prime } \\| \\leq 2 R", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 560, + 230, + 574 + ], + "score": 1.0, + "content": ". For the variance,", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29.5 + }, + { + "type": "interline_equation", + "bbox": [ + 260, + 574, + 350, + 657 + ], + "lines": [ + { + "bbox": [ + 260, + 574, + 350, + 657 + ], + "spans": [ + { + "bbox": [ + 260, + 574, + 350, + 657 + ], + "score": 0.92, + "content": "\\begin{array} { r l } { \\displaystyle \\sigma ^ { 2 } \\leq \\sum _ { k = 1 } ^ { m } \\| \\mathbb { E } [ Z _ { k } ^ { \\prime } Z _ { k } ^ { \\prime * } ] \\| } & { } \\\\ { \\displaystyle \\leq \\sum _ { k = 1 } ^ { m } 4 R ^ { 2 } } & { } \\\\ { \\displaystyle = 4 m R ^ { 2 } . } \\end{array}", + "type": "interline_equation", + "image_path": "1d94449319627579ea1774cb9d41ebce8038f654e04cec8786ab6cae6c9a0281.jpg" + } + ] + } + ], + "index": 31.5, + "virtual_lines": [ + { + "bbox": [ + 260, + 574, + 350, + 615.5 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 260, + 615.5, + 350, + 657.0 + ], + "spans": [], + "index": 32 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 672, + 266, + 684 + ], + "lines": [ + { + "bbox": [ + 106, + 671, + 267, + 685 + ], + "spans": [ + { + "bbox": [ + 106, + 671, + 267, + 685 + ], + "score": 1.0, + "content": "Thus, according to Lemma 23, we have", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33 + }, + { + "type": "interline_equation", + "bbox": [ + 109, + 686, + 499, + 719 + ], + "lines": [ + { + "bbox": [ + 109, + 686, + 499, + 719 + ], + "spans": [ + { + "bbox": [ + 109, + 686, + 499, + 719 + ], + "score": 0.93, + "content": "\\operatorname* { P r } \\left\\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } - \\mathbb { E } [ Z _ { k } ] ) \\big \\| \\geq t \\right\\} = \\operatorname* { P r } \\Big \\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } ^ { \\prime } ) \\big \\| \\geq t \\Big \\} \\leq ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \\Big ) .", + "type": "interline_equation", + "image_path": "b9fbc35b9449087ef7b81e32a95ff6c66a2fcb63eca75c6406d2e122ca0e83a4.jpg" + } + ] + } + ], + "index": 35, + "virtual_lines": [ + { + "bbox": [ + 109, + 686, + 499, + 697.0 + ], + "spans": [], + "index": 34 + }, + { + "bbox": [ + 109, + 697.0, + 499, + 708.0 + ], + "spans": [], + "index": 35 + }, + { + "bbox": [ + 109, + 708.0, + 499, + 719.0 + ], + "spans": [], + "index": 36 + } + ] + } + ], + "page_idx": 49, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 26, + 293, + 38 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 763 + ], + "score": 1.0, + "content": "50", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 154, + 505, + 165 + ], + "lines": [ + { + "bbox": [ + 495, + 155, + 505, + 167 + ], + "spans": [ + { + "bbox": [ + 495, + 155, + 505, + 167 + ], + "score": 1.0, + "content": "\u0003", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 494, + 721, + 504, + 731 + ], + "lines": [ + { + "bbox": [ + 496, + 723, + 504, + 730 + ], + "spans": [ + { + "bbox": [ + 496, + 723, + 504, + 730 + ], + "score": 0.998, + "content": "□", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 504, + 106 + ], + "lines": [ + { + "bbox": [ + 106, + 81, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 81, + 131, + 95 + ], + "score": 1.0, + "content": "Since", + "type": "text" + }, + { + "bbox": [ + 131, + 83, + 140, + 93 + ], + "score": 0.79, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 81, + 283, + 95 + ], + "score": 1.0, + "content": "is an orthonormal matrix, we know", + "type": "text" + }, + { + "bbox": [ + 283, + 82, + 357, + 95 + ], + "score": 0.94, + "content": "\\sigma _ { \\mathrm { m i n } } ( U \\otimes U ) = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 81, + 505, + 95 + ], + "score": 1.0, + "content": ". According to Eq. 19, we know with", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 257, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 183, + 107 + ], + "score": 1.0, + "content": "probability at least", + "type": "text" + }, + { + "bbox": [ + 183, + 93, + 253, + 107 + ], + "score": 0.91, + "content": "1 - \\exp \\bigl ( - d ^ { \\Omega ( 1 ) } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 253, + 93, + 257, + 107 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 105, + 81, + 505, + 107 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 209, + 109, + 402, + 153 + ], + "lines": [ + { + "bbox": [ + 209, + 109, + 402, + 153 + ], + "spans": [ + { + "bbox": [ + 209, + 109, + 402, + 153 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { \\sigma _ { \\operatorname* { m i n } } ( M ^ { \\mathcal { D } ^ { \\prime } } ) \\geq \\sigma _ { \\operatorname* { m i n } } ( \\lambda U \\otimes U H R ) } \\\\ & { \\qquad \\geq \\lambda \\sigma _ { \\operatorname* { m i n } } ( U \\otimes U ) \\sigma _ { \\operatorname* { m i n } } ( H ) \\sigma _ { \\operatorname* { m i n } } ( R ) } \\\\ & { \\qquad \\geq \\mathrm { p o l y } ( 1 / \\tau , 1 / d , \\rho , \\lambda ) } \\end{array}", + "type": "interline_equation", + "image_path": "dd4a55afb1b3eab5c3f0cb6962e6057bbf72c559c1b38a5d938add94d0d3f796.jpg" + } + ] + } + ], + "index": 3, + "virtual_lines": [ + { + "bbox": [ + 209, + 109, + 402, + 123.66666666666667 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 209, + 123.66666666666667, + 402, + 138.33333333333334 + ], + "spans": [], + "index": 3 + }, + { + "bbox": [ + 209, + 138.33333333333334, + 402, + 153.0 + ], + "spans": [], + "index": 4 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 154, + 453, + 167 + ], + "lines": [ + { + "bbox": [ + 105, + 154, + 455, + 167 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 291, + 167 + ], + "score": 1.0, + "content": "where the second inequality holds since all of", + "type": "text" + }, + { + "bbox": [ + 291, + 155, + 320, + 165 + ], + "score": 0.82, + "content": "U \\otimes U", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 154, + 324, + 167 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 324, + 155, + 334, + 165 + ], + "score": 0.77, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 154, + 352, + 167 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 352, + 155, + 361, + 164 + ], + "score": 0.83, + "content": "R", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 154, + 455, + 167 + ], + "score": 1.0, + "content": "have full column rank.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 5, + "bbox_fs": [ + 105, + 154, + 455, + 167 + ] + }, + { + "type": "title", + "bbox": [ + 106, + 181, + 164, + 194 + ], + "lines": [ + { + "bbox": [ + 105, + 179, + 166, + 198 + ], + "spans": [ + { + "bbox": [ + 105, + 179, + 166, + 198 + ], + "score": 1.0, + "content": "D TOOLS", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 106, + 205, + 505, + 251 + ], + "lines": [ + { + "bbox": [ + 105, + 206, + 505, + 218 + ], + "spans": [ + { + "bbox": [ + 105, + 206, + 505, + 218 + ], + "score": 1.0, + "content": "In this section, we collect some known results on matrix perturbations and concentration bounds.", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 217, + 505, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 505, + 229 + ], + "score": 1.0, + "content": "Basically, we used matrix concentration bounds to do the robust analysis and used matrix perturba-", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 227, + 506, + 240 + ], + "spans": [ + { + "bbox": [ + 104, + 227, + 506, + 240 + ], + "score": 1.0, + "content": "tion bounds to do the smoothed analysis. We also proved several corollaries that are useful in our", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 237, + 139, + 253 + ], + "spans": [ + { + "bbox": [ + 104, + 237, + 139, + 253 + ], + "score": 1.0, + "content": "setting.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5, + "bbox_fs": [ + 104, + 206, + 506, + 253 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 262, + 286, + 275 + ], + "lines": [ + { + "bbox": [ + 106, + 262, + 287, + 276 + ], + "spans": [ + { + "bbox": [ + 106, + 262, + 287, + 276 + ], + "score": 1.0, + "content": "D.1 MATRIX CONCENTRATION BOUNDS", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 283, + 504, + 307 + ], + "lines": [ + { + "bbox": [ + 106, + 283, + 505, + 296 + ], + "spans": [ + { + "bbox": [ + 106, + 283, + 505, + 296 + ], + "score": 1.0, + "content": "Matrix concentration bounds tell us that with enough number of independent samples, the empirical", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 295, + 371, + 307 + ], + "spans": [ + { + "bbox": [ + 106, + 295, + 371, + 307 + ], + "score": 1.0, + "content": "mean of a random matrix can converge to the mean of this matrix.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12.5, + "bbox_fs": [ + 106, + 283, + 505, + 307 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 308, + 504, + 331 + ], + "lines": [ + { + "bbox": [ + 105, + 307, + 506, + 321 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 470, + 321 + ], + "score": 1.0, + "content": "Lemma 23 (Matrix Bernstein; Theorem 1.6 in Tropp (2012)). Consider a finite sequence", + "type": "text" + }, + { + "bbox": [ + 471, + 308, + 493, + 321 + ], + "score": 0.91, + "content": "\\{ Z _ { k } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 307, + 506, + 321 + ], + "score": 1.0, + "content": "of", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 319, + 499, + 332 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 293, + 332 + ], + "score": 1.0, + "content": "independent, random matrices with dimension", + "type": "text" + }, + { + "bbox": [ + 294, + 320, + 326, + 331 + ], + "score": 0.91, + "content": "d \\sb { 1 } \\times d \\sb { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 319, + 499, + 332 + ], + "score": 1.0, + "content": ". Assume that each random matrix satisfies", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14.5, + "bbox_fs": [ + 105, + 307, + 506, + 332 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 349, + 135, + 360 + ], + "lines": [ + { + "bbox": [ + 106, + 349, + 135, + 360 + ], + "spans": [], + "index": 16 + } + ], + "index": 16, + "bbox_fs": [ + 106, + 349, + 135, + 360 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 205, + 358, + 405, + 386 + ], + "lines": [ + { + "bbox": [ + 205, + 358, + 405, + 386 + ], + "spans": [ + { + "bbox": [ + 205, + 358, + 405, + 386 + ], + "score": 0.89, + "content": "\\sigma ^ { 2 } : = \\operatorname* { m a x } \\Big \\{ \\big \\| \\sum _ { k } \\mathbb { E } [ Z _ { k } Z _ { k } ^ { * } ] \\big \\| , \\big \\| \\sum _ { k } \\mathbb { E } [ Z _ { k } ^ { * } Z _ { k } ] \\big \\| \\Big \\} .", + "type": "interline_equation", + "image_path": "4364cf432fe55a9c195132ec7a45b6119cf9cfc46c65088fd4e62535ed14411f.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 205, + 358, + 405, + 386 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 386, + 184, + 398 + ], + "lines": [ + { + "bbox": [ + 105, + 384, + 185, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 158, + 399 + ], + "score": 1.0, + "content": "Then, for all", + "type": "text" + }, + { + "bbox": [ + 159, + 387, + 181, + 397 + ], + "score": 0.88, + "content": "t \\geq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 384, + 185, + 399 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18, + "bbox_fs": [ + 105, + 384, + 185, + 399 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 196, + 400, + 414, + 430 + ], + "lines": [ + { + "bbox": [ + 196, + 400, + 414, + 430 + ], + "spans": [ + { + "bbox": [ + 196, + 400, + 414, + 430 + ], + "score": 0.91, + "content": "\\operatorname* { P r } \\Big \\{ \\Big \\| \\sum _ { k } Z _ { k } \\Big \\| \\geq t \\Big \\} \\leq ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { \\sigma ^ { 2 } + R t / 3 } \\Big ) .", + "type": "interline_equation", + "image_path": "bc6c133d4dcec2a99381de075a95422e73ff5350555be96f5171fca65e9e08ae.jpg" + } + ] + } + ], + "index": 19.5, + "virtual_lines": [ + { + "bbox": [ + 196, + 400, + 414, + 415.0 + ], + "spans": [], + "index": 19 + }, + { + "bbox": [ + 196, + 415.0, + 414, + 430.0 + ], + "spans": [], + "index": 20 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 438, + 204, + 450 + ], + "lines": [ + { + "bbox": [ + 106, + 437, + 205, + 452 + ], + "spans": [ + { + "bbox": [ + 106, + 437, + 205, + 452 + ], + "score": 1.0, + "content": "As a corollary, we have:", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21, + "bbox_fs": [ + 106, + 437, + 205, + 452 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 452, + 504, + 475 + ], + "lines": [ + { + "bbox": [ + 105, + 451, + 506, + 465 + ], + "spans": [ + { + "bbox": [ + 105, + 451, + 275, + 465 + ], + "score": 1.0, + "content": "Lemma 24. Consider a finite sequence", + "type": "text" + }, + { + "bbox": [ + 275, + 452, + 343, + 464 + ], + "score": 0.93, + "content": "\\{ Z _ { 1 } , Z _ { 2 } \\cdot \\cdot \\cdot Z _ { m } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 451, + 506, + 465 + ], + "score": 1.0, + "content": "of independent, random matrices with", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 462, + 355, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 462, + 150, + 476 + ], + "score": 1.0, + "content": "dimension", + "type": "text" + }, + { + "bbox": [ + 150, + 463, + 182, + 474 + ], + "score": 0.91, + "content": "d _ { 1 } \\times d _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 462, + 355, + 476 + ], + "score": 1.0, + "content": ". Assume that each random matrix satisfies", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 22.5, + "bbox_fs": [ + 105, + 451, + 506, + 476 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 255, + 477, + 355, + 490 + ], + "lines": [ + { + "bbox": [ + 255, + 477, + 355, + 490 + ], + "spans": [ + { + "bbox": [ + 255, + 477, + 355, + 490 + ], + "score": 0.89, + "content": "\\left\\| Z _ { k } \\right\\| \\le R , 1 \\le k \\le m .", + "type": "interline_equation", + "image_path": "195f78f69dcdc5b153ed3af5aaa8e692c001d313315bc0db6e9d62b8f71705eb.jpg" + } + ] + } + ], + "index": 24, + "virtual_lines": [ + { + "bbox": [ + 255, + 477, + 355, + 490 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 492, + 185, + 504 + ], + "lines": [ + { + "bbox": [ + 105, + 491, + 186, + 505 + ], + "spans": [ + { + "bbox": [ + 105, + 491, + 158, + 505 + ], + "score": 1.0, + "content": "Then, for all", + "type": "text" + }, + { + "bbox": [ + 159, + 493, + 181, + 504 + ], + "score": 0.86, + "content": "t \\geq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 491, + 186, + 505 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25, + "bbox_fs": [ + 105, + 491, + 186, + 505 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 161, + 506, + 450, + 538 + ], + "lines": [ + { + "bbox": [ + 161, + 506, + 450, + 538 + ], + "spans": [ + { + "bbox": [ + 161, + 506, + 450, + 538 + ], + "score": 0.94, + "content": "\\operatorname* { P r } \\Big \\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } - \\mathbb { E } [ Z _ { k } ] ) \\big \\| \\ge t \\Big \\} \\le ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \\Big ) .", + "type": "interline_equation", + "image_path": "5ca5ee813f840411fab51b7145825f544c0b0f658487dc24880b3eae62b8eb72.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 161, + 506, + 450, + 516.6666666666666 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 161, + 516.6666666666666, + 450, + 527.3333333333333 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 161, + 527.3333333333333, + 450, + 537.9999999999999 + ], + "spans": [], + "index": 28 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 549, + 505, + 573 + ], + "lines": [ + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 173, + 563 + ], + "score": 1.0, + "content": "Proof. For each", + "type": "text" + }, + { + "bbox": [ + 173, + 551, + 180, + 560 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 549, + 196, + 563 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 196, + 550, + 270, + 562 + ], + "score": 0.93, + "content": "Z _ { k } ^ { \\prime } = Z _ { k } - \\mathbb { E } [ Z _ { k } ]", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 549, + 443, + 563 + ], + "score": 1.0, + "content": "be the new random matrices. It’s clear that", + "type": "text" + }, + { + "bbox": [ + 444, + 550, + 487, + 562 + ], + "score": 0.93, + "content": "\\mathbb { E } [ Z _ { k } ^ { \\prime } ] = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 549, + 506, + 563 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 107, + 560, + 230, + 574 + ], + "spans": [ + { + "bbox": [ + 107, + 561, + 155, + 573 + ], + "score": 0.92, + "content": "\\| Z _ { k } ^ { \\prime } \\| \\leq 2 R", + "type": "inline_equation" + }, + { + "bbox": [ + 156, + 560, + 230, + 574 + ], + "score": 1.0, + "content": ". For the variance,", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29.5, + "bbox_fs": [ + 105, + 549, + 506, + 574 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 260, + 574, + 350, + 657 + ], + "lines": [ + { + "bbox": [ + 260, + 574, + 350, + 657 + ], + "spans": [ + { + "bbox": [ + 260, + 574, + 350, + 657 + ], + "score": 0.92, + "content": "\\begin{array} { r l } { \\displaystyle \\sigma ^ { 2 } \\leq \\sum _ { k = 1 } ^ { m } \\| \\mathbb { E } [ Z _ { k } ^ { \\prime } Z _ { k } ^ { \\prime * } ] \\| } & { } \\\\ { \\displaystyle \\leq \\sum _ { k = 1 } ^ { m } 4 R ^ { 2 } } & { } \\\\ { \\displaystyle = 4 m R ^ { 2 } . } \\end{array}", + "type": "interline_equation", + "image_path": "1d94449319627579ea1774cb9d41ebce8038f654e04cec8786ab6cae6c9a0281.jpg" + } + ] + } + ], + "index": 31.5, + "virtual_lines": [ + { + "bbox": [ + 260, + 574, + 350, + 615.5 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 260, + 615.5, + 350, + 657.0 + ], + "spans": [], + "index": 32 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 672, + 266, + 684 + ], + "lines": [ + { + "bbox": [ + 106, + 671, + 267, + 685 + ], + "spans": [ + { + "bbox": [ + 106, + 671, + 267, + 685 + ], + "score": 1.0, + "content": "Thus, according to Lemma 23, we have", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33, + "bbox_fs": [ + 106, + 671, + 267, + 685 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 109, + 686, + 499, + 719 + ], + "lines": [ + { + "bbox": [ + 109, + 686, + 499, + 719 + ], + "spans": [ + { + "bbox": [ + 109, + 686, + 499, + 719 + ], + "score": 0.93, + "content": "\\operatorname* { P r } \\left\\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } - \\mathbb { E } [ Z _ { k } ] ) \\big \\| \\geq t \\right\\} = \\operatorname* { P r } \\Big \\{ \\big \\| \\sum _ { k = 1 } ^ { m } ( Z _ { k } ^ { \\prime } ) \\big \\| \\geq t \\Big \\} \\leq ( d _ { 1 } + d _ { 2 } ) \\exp \\Big ( \\frac { - t ^ { 2 } / 2 } { 4 m R ^ { 2 } + ( 2 R t ) / 3 } \\Big ) .", + "type": "interline_equation", + "image_path": "b9fbc35b9449087ef7b81e32a95ff6c66a2fcb63eca75c6406d2e122ca0e83a4.jpg" + } + ] + } + ], + "index": 35, + "virtual_lines": [ + { + "bbox": [ + 109, + 686, + 499, + 697.0 + ], + "spans": [], + "index": 34 + }, + { + "bbox": [ + 109, + 697.0, + 499, + 708.0 + ], + "spans": [], + "index": 35 + }, + { + "bbox": [ + 109, + 708.0, + 499, + 719.0 + ], + "spans": [], + "index": 36 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 82, + 277, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 279, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 279, + 95 + ], + "score": 1.0, + "content": "D.2 MATRIX PERTURBATION BOUNDS", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 105, + 102, + 504, + 126 + ], + "lines": [ + { + "bbox": [ + 105, + 100, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 100, + 505, + 117 + ], + "score": 1.0, + "content": "Perturbation Bound for Singular Vectors For singular vectors, the perturbation is bounded by", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 113, + 182, + 127 + ], + "spans": [ + { + "bbox": [ + 106, + 113, + 182, + 127 + ], + "score": 1.0, + "content": "Wedin’s Theorem.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1.5 + }, + { + "type": "text", + "bbox": [ + 106, + 128, + 504, + 151 + ], + "lines": [ + { + "bbox": [ + 105, + 127, + 505, + 141 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 505, + 141 + ], + "score": 1.0, + "content": "Lemma 25 (Wedin’s theorem; Theorem 4.1, p.260 in Stewart & Sun (1990).). Given matrices", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 107, + 137, + 403, + 153 + ], + "spans": [ + { + "bbox": [ + 107, + 140, + 165, + 151 + ], + "score": 0.91, + "content": "A , E \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 137, + 186, + 153 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 187, + 140, + 216, + 151 + ], + "score": 0.89, + "content": "m \\geq n", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 137, + 235, + 153 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 236, + 140, + 244, + 150 + ], + "score": 0.68, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 137, + 403, + 153 + ], + "score": 1.0, + "content": "have the singular value decomposition", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 156, + 384, + 191 + ], + "lines": [ + { + "bbox": [ + 226, + 156, + 384, + 191 + ], + "spans": [ + { + "bbox": [ + 226, + 156, + 384, + 191 + ], + "score": 0.94, + "content": "A = [ U _ { 1 } , U _ { 2 } , U _ { 3 } ] \\left[ \\begin{array} { c c } { { \\Sigma _ { 1 } } } & { { 0 } } \\\\ { { 0 } } & { { \\Sigma _ { 2 } } } \\\\ { { 0 } } & { { 0 } } \\end{array} \\right] \\left[ V _ { 1 } , V _ { 2 } \\right] ^ { \\top }", + "type": "interline_equation", + "image_path": "e646d7370e52318aa85b72e95588963f21729e24894aa17cb0035050506d0b6a.jpg" + } + ] + } + ], + "index": 5.5, + "virtual_lines": [ + { + "bbox": [ + 226, + 156, + 384, + 173.5 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 226, + 173.5, + 384, + 191.0 + ], + "spans": [], + "index": 6 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 198, + 506, + 235 + ], + "lines": [ + { + "bbox": [ + 105, + 196, + 506, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 196, + 122, + 213 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 197, + 174, + 210 + ], + "score": 0.91, + "content": "{ \\hat { A } } = A + E", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 196, + 385, + 213 + ], + "score": 1.0, + "content": ", with analogous singular value decomposition. Let", + "type": "text" + }, + { + "bbox": [ + 386, + 199, + 394, + 209 + ], + "score": 0.79, + "content": "\\Phi", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 196, + 506, + 213 + ], + "score": 1.0, + "content": "be the matrix of canonical", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 210, + 504, + 223 + ], + "spans": [ + { + "bbox": [ + 106, + 212, + 254, + 223 + ], + "score": 1.0, + "content": "angles between the column span of", + "type": "text" + }, + { + "bbox": [ + 254, + 212, + 266, + 222 + ], + "score": 0.88, + "content": "U _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 212, + 317, + 223 + ], + "score": 1.0, + "content": "and that of", + "type": "text" + }, + { + "bbox": [ + 318, + 210, + 330, + 222 + ], + "score": 0.88, + "content": "\\hat { U } _ { 1 { : } }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 212, + 353, + 223 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 353, + 212, + 363, + 222 + ], + "score": 0.75, + "content": "\\Theta", + "type": "inline_equation" + }, + { + "bbox": [ + 363, + 212, + 504, + 223 + ], + "score": 1.0, + "content": "be the matrix of canonical angles", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 222, + 449, + 236 + ], + "spans": [ + { + "bbox": [ + 106, + 223, + 220, + 236 + ], + "score": 1.0, + "content": "between the column span of", + "type": "text" + }, + { + "bbox": [ + 220, + 224, + 231, + 235 + ], + "score": 0.85, + "content": "V _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 223, + 278, + 236 + ], + "score": 1.0, + "content": "and that of", + "type": "text" + }, + { + "bbox": [ + 279, + 222, + 289, + 235 + ], + "score": 0.88, + "content": "\\hat { V } _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 223, + 402, + 236 + ], + "score": 1.0, + "content": ". Suppose that there exists a", + "type": "text" + }, + { + "bbox": [ + 402, + 224, + 408, + 234 + ], + "score": 0.67, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 223, + 449, + 236 + ], + "score": 1.0, + "content": "such that", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 8 + }, + { + "type": "interline_equation", + "bbox": [ + 203, + 239, + 406, + 259 + ], + "lines": [ + { + "bbox": [ + 203, + 239, + 406, + 259 + ], + "spans": [ + { + "bbox": [ + 203, + 239, + 406, + 259 + ], + "score": 0.89, + "content": "\\operatorname* { m i n } _ { i , j } | [ \\Sigma _ { 1 } ] _ { i , i } - [ \\Sigma _ { 2 } ] _ { j , j } | > \\delta a n d \\operatorname* { m i n } _ { i } | [ \\Sigma _ { 1 } ] _ { i , i } | > \\delta ,", + "type": "interline_equation", + "image_path": "3972342c4dbeea8e4bc4026811a0ccfe8c7ef6b7f38f70702e6794b6ba82b856.jpg" + } + ] + } + ], + "index": 10, + "virtual_lines": [ + { + "bbox": [ + 203, + 239, + 406, + 259 + ], + "spans": [], + "index": 10 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 264, + 126, + 275 + ], + "lines": [ + { + "bbox": [ + 105, + 263, + 127, + 276 + ], + "spans": [ + { + "bbox": [ + 105, + 263, + 127, + 276 + ], + "score": 1.0, + "content": "then", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "interline_equation", + "bbox": [ + 231, + 271, + 379, + 297 + ], + "lines": [ + { + "bbox": [ + 231, + 271, + 379, + 297 + ], + "spans": [ + { + "bbox": [ + 231, + 271, + 379, + 297 + ], + "score": 0.92, + "content": "\\| \\sin ( \\Phi ) \\| ^ { 2 } + \\| \\sin ( \\Theta ) \\| ^ { 2 } \\leq 2 \\frac { \\| E \\| ^ { 2 } } { \\delta ^ { 2 } } .", + "type": "interline_equation", + "image_path": "d7af7a7475d8dc89534cb471af334e3be467ce1374f32644ea7696838c736156.jpg" + } + ] + } + ], + "index": 12, + "virtual_lines": [ + { + "bbox": [ + 231, + 271, + 379, + 297 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 304, + 504, + 326 + ], + "lines": [ + { + "bbox": [ + 106, + 304, + 505, + 316 + ], + "spans": [ + { + "bbox": [ + 106, + 304, + 265, + 316 + ], + "score": 1.0, + "content": "In order to show the robustness of least", + "type": "text" + }, + { + "bbox": [ + 266, + 305, + 272, + 314 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 304, + 371, + 316 + ], + "score": 1.0, + "content": "right singular vectors of", + "type": "text" + }, + { + "bbox": [ + 372, + 305, + 380, + 314 + ], + "score": 0.84, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 304, + 505, + 316 + ], + "score": 1.0, + "content": ", we combine Wedin’s theorem", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 314, + 217, + 327 + ], + "spans": [ + { + "bbox": [ + 106, + 314, + 217, + 327 + ], + "score": 1.0, + "content": "with the following Lemma.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 13.5 + }, + { + "type": "text", + "bbox": [ + 106, + 329, + 504, + 354 + ], + "lines": [ + { + "bbox": [ + 105, + 328, + 505, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 328, + 360, + 343 + ], + "score": 1.0, + "content": "Lemma 26 (Theorem 4.5, p.92 in Stewart & Sun (1990).). Let", + "type": "text" + }, + { + "bbox": [ + 360, + 330, + 368, + 340 + ], + "score": 0.76, + "content": "\\Phi", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 328, + 505, + 343 + ], + "score": 1.0, + "content": "be the matrix of canonical angles", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 341, + 308, + 355 + ], + "spans": [ + { + "bbox": [ + 106, + 342, + 220, + 355 + ], + "score": 1.0, + "content": "between the column span of", + "type": "text" + }, + { + "bbox": [ + 220, + 343, + 229, + 352 + ], + "score": 0.76, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 342, + 276, + 355 + ], + "score": 1.0, + "content": "and that of", + "type": "text" + }, + { + "bbox": [ + 276, + 341, + 285, + 352 + ], + "score": 0.83, + "content": "\\hat { U }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 342, + 308, + 355 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5 + }, + { + "type": "interline_equation", + "bbox": [ + 242, + 358, + 369, + 373 + ], + "lines": [ + { + "bbox": [ + 242, + 358, + 369, + 373 + ], + "spans": [ + { + "bbox": [ + 242, + 358, + 369, + 373 + ], + "score": 0.92, + "content": "\\| P r o j _ { \\hat { U } } - P r o j _ { U } \\| = \\| \\sin ( \\Phi ) \\| .", + "type": "interline_equation", + "image_path": "1b6bfdcffcc4a9e0c7954aca6ab58edb68bc39da8517242fc35e92e62cfa2e28.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 242, + 358, + 369, + 373 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 382, + 429, + 395 + ], + "lines": [ + { + "bbox": [ + 105, + 381, + 429, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 429, + 397 + ], + "score": 1.0, + "content": "The exact lemma used in our proof is the following corollary in Ge et al. (2015).", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 106, + 397, + 507, + 434 + ], + "lines": [ + { + "bbox": [ + 105, + 394, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 351, + 411 + ], + "score": 1.0, + "content": "Lemma 27 (Lemma G.5 in Ge et al. (2015)). Given matrix", + "type": "text" + }, + { + "bbox": [ + 351, + 397, + 411, + 409 + ], + "score": 0.91, + "content": "A , E \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 394, + 432, + 411 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 433, + 398, + 464, + 408 + ], + "score": 0.88, + "content": "m \\geq n", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 394, + 506, + 411 + ], + "score": 1.0, + "content": ". Suppose", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 408, + 506, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 139, + 424 + ], + "score": 1.0, + "content": "that the", + "type": "text" + }, + { + "bbox": [ + 140, + 410, + 148, + 420 + ], + "score": 0.38, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 408, + 186, + 424 + ], + "score": 1.0, + "content": "has rank", + "type": "text" + }, + { + "bbox": [ + 186, + 411, + 192, + 420 + ], + "score": 0.65, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 408, + 212, + 424 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 212, + 410, + 221, + 420 + ], + "score": 0.71, + "content": "s", + "type": "inline_equation" + }, + { + "bbox": [ + 221, + 408, + 239, + 424 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 239, + 408, + 248, + 420 + ], + "score": 0.8, + "content": "\\hat { S }", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 408, + 398, + 424 + ], + "score": 1.0, + "content": "be the subspaces spanned by the first", + "type": "text" + }, + { + "bbox": [ + 398, + 411, + 405, + 420 + ], + "score": 0.64, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 408, + 506, + 424 + ], + "score": 1.0, + "content": "right singular vectors of", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 421, + 303, + 435 + ], + "spans": [ + { + "bbox": [ + 106, + 423, + 115, + 433 + ], + "score": 0.65, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 421, + 134, + 435 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 134, + 421, + 183, + 433 + ], + "score": 0.92, + "content": "{ \\hat { A } } = A + E", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 421, + 303, + 435 + ], + "score": 1.0, + "content": ", respectively. Then, we have:", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20 + }, + { + "type": "interline_equation", + "bbox": [ + 236, + 439, + 375, + 467 + ], + "lines": [ + { + "bbox": [ + 236, + 439, + 375, + 467 + ], + "spans": [ + { + "bbox": [ + 236, + 439, + 375, + 467 + ], + "score": 0.94, + "content": "\\| P r o j _ { \\hat { S } ^ { \\perp } } - P r o j _ { S ^ { \\perp } } \\| \\leq \\frac { \\sqrt { 2 } \\| E \\| _ { F } } { \\sigma _ { k } ( A ) } .", + "type": "interline_equation", + "image_path": "fe302abdcad4da8a3cbe12feb3f8af1f9bf8ad9059ca5aff6d565048c24e1f00.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 236, + 439, + 375, + 467 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 477, + 504, + 501 + ], + "lines": [ + { + "bbox": [ + 105, + 476, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 374, + 491 + ], + "score": 1.0, + "content": "Perturbation Bound for pseudo-inverse With a lowerbound on", + "type": "text" + }, + { + "bbox": [ + 375, + 478, + 410, + 490 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( A )", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 476, + 505, + 491 + ], + "score": 1.0, + "content": ", we can get bounds for", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 488, + 248, + 502 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 248, + 502 + ], + "score": 1.0, + "content": "the perturbation of pseudo-inverse.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5 + }, + { + "type": "text", + "bbox": [ + 106, + 503, + 502, + 526 + ], + "lines": [ + { + "bbox": [ + 104, + 502, + 498, + 516 + ], + "spans": [ + { + "bbox": [ + 104, + 502, + 449, + 516 + ], + "score": 1.0, + "content": "Lemma 28 (Theorem 3.4 in Stewart (1977)). Consider the perturbation of a matrix", + "type": "text" + }, + { + "bbox": [ + 449, + 503, + 498, + 514 + ], + "score": 0.9, + "content": "A \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 513, + 343, + 527 + ], + "spans": [ + { + "bbox": [ + 107, + 515, + 157, + 525 + ], + "score": 0.9, + "content": "B = A + E", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 513, + 232, + 527 + ], + "score": 1.0, + "content": ". Assume that rank", + "type": "text" + }, + { + "bbox": [ + 232, + 515, + 319, + 527 + ], + "score": 0.71, + "content": "; ( A ) = r a n k ( B ) = n", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 513, + 343, + 527 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25.5 + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 531, + 375, + 547 + ], + "lines": [ + { + "bbox": [ + 235, + 531, + 375, + 547 + ], + "spans": [ + { + "bbox": [ + 235, + 531, + 375, + 547 + ], + "score": 0.89, + "content": "\\| B ^ { \\dagger } - A ^ { \\dagger } \\| \\leq \\sqrt { 2 } \\| A ^ { \\dagger } \\| \\| B ^ { \\dagger } \\| \\| E \\| .", + "type": "interline_equation", + "image_path": "21492791b69566c8a13fb61b61ed7dd67f19aaf939548d18c92bf81b3f72d44b.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 235, + 531, + 375, + 547 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 556, + 316, + 569 + ], + "lines": [ + { + "bbox": [ + 106, + 555, + 317, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 555, + 317, + 572 + ], + "score": 1.0, + "content": "The following corollary is particularly useful for us.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 106, + 571, + 504, + 595 + ], + "lines": [ + { + "bbox": [ + 104, + 570, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 104, + 570, + 449, + 585 + ], + "score": 1.0, + "content": "Lemma 29 (Lemma G.8 in Ge et al. (2015)). Consider the perturbation of a matrix", + "type": "text" + }, + { + "bbox": [ + 450, + 572, + 498, + 582 + ], + "score": 0.9, + "content": "A \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 498, + 570, + 506, + 585 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 107, + 581, + 449, + 596 + ], + "spans": [ + { + "bbox": [ + 107, + 583, + 157, + 594 + ], + "score": 0.89, + "content": "B = A + E", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 581, + 185, + 596 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 185, + 583, + 262, + 595 + ], + "score": 0.92, + "content": "\\| E \\| \\le \\sigma _ { \\operatorname* { m i n } } ( A ) / 2", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 581, + 320, + 596 + ], + "score": 1.0, + "content": ". Assume that", + "type": "text" + }, + { + "bbox": [ + 320, + 583, + 424, + 595 + ], + "score": 0.84, + "content": "\\cdot a n k ( A ) = r a n k ( B ) = n", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 581, + 449, + 596 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29.5 + }, + { + "type": "interline_equation", + "bbox": [ + 233, + 599, + 378, + 615 + ], + "lines": [ + { + "bbox": [ + 233, + 599, + 378, + 615 + ], + "spans": [ + { + "bbox": [ + 233, + 599, + 378, + 615 + ], + "score": 0.91, + "content": "\\| B ^ { \\dagger } - A ^ { \\dagger } \\| \\leq 2 \\sqrt { 2 } \\| E \\| / \\sigma _ { \\operatorname* { m i n } } ( A ) ^ { 2 } .", + "type": "interline_equation", + "image_path": "fe5b4078b8c89ce9aa42cc19bf9ba500b3cf541b4e15ffef653b49e6e5a5f55b.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 233, + 599, + 378, + 615 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 104, + 625, + 504, + 648 + ], + "lines": [ + { + "bbox": [ + 105, + 625, + 505, + 638 + ], + "spans": [ + { + "bbox": [ + 105, + 625, + 505, + 638 + ], + "score": 1.0, + "content": "Perturbation Bound for Tensor To lowerbound the leave-one-out distance in augmented distin-", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 637, + 364, + 648 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 364, + 648 + ], + "score": 1.0, + "content": "guishing matrix , we use the following Lemma as the main tool.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5 + }, + { + "type": "text", + "bbox": [ + 106, + 650, + 505, + 703 + ], + "lines": [ + { + "bbox": [ + 104, + 649, + 506, + 666 + ], + "spans": [ + { + "bbox": [ + 104, + 649, + 382, + 666 + ], + "score": 1.0, + "content": "Lemma 30 (Theorem 3.6 in Bhaskara et al. (2014)). 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Given matrices", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 107, + 137, + 403, + 153 + ], + "spans": [ + { + "bbox": [ + 107, + 140, + 165, + 151 + ], + "score": 0.91, + "content": "A , E \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 137, + 186, + 153 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 187, + 140, + 216, + 151 + ], + "score": 0.89, + "content": "m \\geq n", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 137, + 235, + 153 + ], + "score": 1.0, + "content": ". 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Let", + "type": "text" + }, + { + "bbox": [ + 360, + 330, + 368, + 340 + ], + "score": 0.76, + "content": "\\Phi", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 328, + 505, + 343 + ], + "score": 1.0, + "content": "be the matrix of canonical angles", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 341, + 308, + 355 + ], + "spans": [ + { + "bbox": [ + 106, + 342, + 220, + 355 + ], + "score": 1.0, + "content": "between the column span of", + "type": "text" + }, + { + "bbox": [ + 220, + 343, + 229, + 352 + ], + "score": 0.76, + "content": "U", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 342, + 276, + 355 + ], + "score": 1.0, + "content": "and that of", + "type": "text" + }, + { + "bbox": [ + 276, + 341, + 285, + 352 + ], + "score": 0.83, + "content": "\\hat { U }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 342, + 308, + 355 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 328, + 505, + 355 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 242, + 358, + 369, + 373 + ], + "lines": [ + { + "bbox": [ + 242, + 358, + 369, + 373 + ], + "spans": [ + { + "bbox": [ + 242, + 358, + 369, + 373 + ], + "score": 0.92, + "content": "\\| P r o j _ { \\hat { U } } - P r o j _ { U } \\| = \\| \\sin ( \\Phi ) \\| .", + "type": "interline_equation", + "image_path": "1b6bfdcffcc4a9e0c7954aca6ab58edb68bc39da8517242fc35e92e62cfa2e28.jpg" + } + ] + } + ], + "index": 17, + "virtual_lines": [ + { + "bbox": [ + 242, + 358, + 369, + 373 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 382, + 429, + 395 + ], + "lines": [ + { + "bbox": [ + 105, + 381, + 429, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 429, + 397 + ], + "score": 1.0, + "content": "The exact lemma used in our proof is the following corollary in Ge et al. 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Then, we have:", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20, + "bbox_fs": [ + 105, + 394, + 506, + 435 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 236, + 439, + 375, + 467 + ], + "lines": [ + { + "bbox": [ + 236, + 439, + 375, + 467 + ], + "spans": [ + { + "bbox": [ + 236, + 439, + 375, + 467 + ], + "score": 0.94, + "content": "\\| P r o j _ { \\hat { S } ^ { \\perp } } - P r o j _ { S ^ { \\perp } } \\| \\leq \\frac { \\sqrt { 2 } \\| E \\| _ { F } } { \\sigma _ { k } ( A ) } .", + "type": "interline_equation", + "image_path": "fe302abdcad4da8a3cbe12feb3f8af1f9bf8ad9059ca5aff6d565048c24e1f00.jpg" + } + ] + } + ], + "index": 22, + "virtual_lines": [ + { + "bbox": [ + 236, + 439, + 375, + 467 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 477, + 504, + 501 + ], + "lines": [ + { + "bbox": [ + 105, + 476, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 374, + 491 + ], + "score": 1.0, + "content": "Perturbation Bound for pseudo-inverse With a lowerbound on", + "type": "text" + }, + { + "bbox": [ + 375, + 478, + 410, + 490 + ], + "score": 0.93, + "content": "\\sigma _ { \\mathrm { m i n } } ( A )", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 476, + 505, + 491 + ], + "score": 1.0, + "content": ", we can get bounds for", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 488, + 248, + 502 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 248, + 502 + ], + "score": 1.0, + "content": "the perturbation of pseudo-inverse.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 476, + 505, + 502 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 503, + 502, + 526 + ], + "lines": [ + { + "bbox": [ + 104, + 502, + 498, + 516 + ], + "spans": [ + { + "bbox": [ + 104, + 502, + 449, + 516 + ], + "score": 1.0, + "content": "Lemma 28 (Theorem 3.4 in Stewart (1977)). Consider the perturbation of a matrix", + "type": "text" + }, + { + "bbox": [ + 449, + 503, + 498, + 514 + ], + "score": 0.9, + "content": "A \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 513, + 343, + 527 + ], + "spans": [ + { + "bbox": [ + 107, + 515, + 157, + 525 + ], + "score": 0.9, + "content": "B = A + E", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 513, + 232, + 527 + ], + "score": 1.0, + "content": ". Assume that rank", + "type": "text" + }, + { + "bbox": [ + 232, + 515, + 319, + 527 + ], + "score": 0.71, + "content": "; ( A ) = r a n k ( B ) = n", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 513, + 343, + 527 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 25.5, + "bbox_fs": [ + 104, + 502, + 498, + 527 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 531, + 375, + 547 + ], + "lines": [ + { + "bbox": [ + 235, + 531, + 375, + 547 + ], + "spans": [ + { + "bbox": [ + 235, + 531, + 375, + 547 + ], + "score": 0.89, + "content": "\\| B ^ { \\dagger } - A ^ { \\dagger } \\| \\leq \\sqrt { 2 } \\| A ^ { \\dagger } \\| \\| B ^ { \\dagger } \\| \\| E \\| .", + "type": "interline_equation", + "image_path": "21492791b69566c8a13fb61b61ed7dd67f19aaf939548d18c92bf81b3f72d44b.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 235, + 531, + 375, + 547 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 556, + 316, + 569 + ], + "lines": [ + { + "bbox": [ + 106, + 555, + 317, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 555, + 317, + 572 + ], + "score": 1.0, + "content": "The following corollary is particularly useful for us.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28, + "bbox_fs": [ + 106, + 555, + 317, + 572 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 571, + 504, + 595 + ], + "lines": [ + { + "bbox": [ + 104, + 570, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 104, + 570, + 449, + 585 + ], + "score": 1.0, + "content": "Lemma 29 (Lemma G.8 in Ge et al. (2015)). Consider the perturbation of a matrix", + "type": "text" + }, + { + "bbox": [ + 450, + 572, + 498, + 582 + ], + "score": 0.9, + "content": "A \\in \\mathbb { R } ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 498, + 570, + 506, + 585 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 107, + 581, + 449, + 596 + ], + "spans": [ + { + "bbox": [ + 107, + 583, + 157, + 594 + ], + "score": 0.89, + "content": "B = A + E", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 581, + 185, + 596 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 185, + 583, + 262, + 595 + ], + "score": 0.92, + "content": "\\| E \\| \\le \\sigma _ { \\operatorname* { m i n } } ( A ) / 2", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 581, + 320, + 596 + ], + "score": 1.0, + "content": ". Assume that", + "type": "text" + }, + { + "bbox": [ + 320, + 583, + 424, + 595 + ], + "score": 0.84, + "content": "\\cdot a n k ( A ) = r a n k ( B ) = n", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 581, + 449, + 596 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29.5, + "bbox_fs": [ + 104, + 570, + 506, + 596 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 233, + 599, + 378, + 615 + ], + "lines": [ + { + "bbox": [ + 233, + 599, + 378, + 615 + ], + "spans": [ + { + "bbox": [ + 233, + 599, + 378, + 615 + ], + "score": 0.91, + "content": "\\| B ^ { \\dagger } - A ^ { \\dagger } \\| \\leq 2 \\sqrt { 2 } \\| E \\| / \\sigma _ { \\operatorname* { m i n } } ( A ) ^ { 2 } .", + "type": "interline_equation", + "image_path": "fe5b4078b8c89ce9aa42cc19bf9ba500b3cf541b4e15ffef653b49e6e5a5f55b.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 233, + 599, + 378, + 615 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 104, + 625, + 504, + 648 + ], + "lines": [ + { + "bbox": [ + 105, + 625, + 505, + 638 + ], + "spans": [ + { + "bbox": [ + 105, + 625, + 505, + 638 + ], + "score": 1.0, + "content": "Perturbation Bound for Tensor To lowerbound the leave-one-out distance in augmented distin-", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 637, + 364, + 648 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 364, + 648 + ], + "score": 1.0, + "content": "guishing matrix , we use the following Lemma as the main tool.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5, + "bbox_fs": [ + 105, + 625, + 505, + 648 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 650, + 505, + 703 + ], + "lines": [ + { + "bbox": [ + 104, + 649, + 506, + 666 + ], + "spans": [ + { + "bbox": [ + 104, + 649, + 382, + 666 + ], + "score": 1.0, + "content": "Lemma 30 (Theorem 3.6 in Bhaskara et al. (2014)). For any constant", + "type": "text" + }, + { + "bbox": [ + 383, + 651, + 423, + 663 + ], + "score": 0.92, + "content": "\\delta \\in ( 0 , 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 423, + 649, + 506, + 666 + ], + "score": 1.0, + "content": ", given any subspace", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 662, + 506, + 679 + ], + "spans": [ + { + "bbox": [ + 106, + 665, + 115, + 676 + ], + "score": 0.67, + "content": "\\nu", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 662, + 173, + 679 + ], + "score": 1.0, + "content": "of dimension √", + "type": "text" + }, + { + "bbox": [ + 173, + 663, + 187, + 675 + ], + "score": 0.81, + "content": "\\delta d ^ { l }", + "type": "inline_equation" + }, + { + "bbox": [ + 188, + 662, + 201, + 679 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 201, + 662, + 216, + 675 + ], + "score": 0.86, + "content": "\\mathbb { R } ^ { d ^ { l } }", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 662, + 300, + 679 + ], + "score": 1.0, + "content": ", there exist vectors", + "type": "text" + }, + { + "bbox": [ + 301, + 667, + 358, + 676 + ], + "score": 0.85, + "content": "v _ { 1 } , v _ { 2 } , \\cdots , v _ { r }", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 662, + 371, + 679 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 372, + 666, + 380, + 675 + ], + "score": 0.81, + "content": "\\nu", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 662, + 506, + 679 + ], + "score": 1.0, + "content": "with unit norm, such that for", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 674, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 674, + 140, + 691 + ], + "score": 1.0, + "content": "random", + "type": "text" + }, + { + "bbox": [ + 140, + 676, + 172, + 690 + ], + "score": 0.91, + "content": "( \\rho / \\sqrt { d } )", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 674, + 231, + 691 + ], + "score": 1.0, + "content": "-perturbations", + "type": "text" + }, + { + "bbox": [ + 231, + 676, + 332, + 689 + ], + "score": 0.91, + "content": "\\widetilde { x } ^ { ( 1 ) } , \\widetilde { x } ^ { ( 2 ) } , \\cdot \\cdot \\cdot , \\widetilde { x } ^ { ( l ) } \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 674, + 387, + 691 + ], + "score": 1.0, + "content": "of any vector", + "type": "text" + }, + { + "bbox": [ + 387, + 676, + 487, + 689 + ], + "score": 0.92, + "content": "x ^ { ( 1 ) } , x ^ { ( 2 ) } , \\cdot \\cdot \\cdot , x ^ { ( l ) } \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 674, + 506, + 691 + ], + "score": 1.0, + "content": ", we", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 104, + 688, + 315, + 703 + ], + "spans": [ + { + "bbox": [ + 104, + 688, + 228, + 703 + ], + "score": 1.0, + "content": "know with probability at least", + "type": "text" + }, + { + "bbox": [ + 228, + 689, + 309, + 703 + ], + "score": 0.89, + "content": "1 - \\exp \\bigl ( - \\delta d ^ { 1 / ( 2 l ) ^ { l } } \\bigr )", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 688, + 315, + 703 + ], + "score": 1.0, + "content": "),", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 35.5, + "bbox_fs": [ + 104, + 649, + 506, + 703 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 202, + 708, + 408, + 730 + ], + "lines": [ + { + "bbox": [ + 202, + 708, + 408, + 730 + ], + "spans": [ + { + "bbox": [ + 202, + 708, + 408, + 730 + ], + "score": 0.91, + "content": "\\exists j \\in [ r ] , \\langle v _ { j } , \\widetilde { x } ^ { ( 1 ) } \\otimes \\widetilde { x } ^ { ( 2 ) } \\otimes \\cdots \\otimes \\widetilde { x } ^ { ( l ) } \\rangle \\geq \\rho ^ { l } ( \\frac { 1 } { d } ) ^ { 3 ^ { l } } .", + "type": "interline_equation", + "image_path": "35bf71b227265eebed9be08dc9877f64b87df5eac04bfc828956555bc547e104.jpg" + } + ] + } + ], + "index": 38, + "virtual_lines": [ + { + "bbox": [ + 202, + 708, + 408, + 730 + ], + "spans": [], + "index": 38 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 336, + 94 + ], + "lines": [ + { + "bbox": [ + 105, + 79, + 338, + 97 + ], + "spans": [ + { + "bbox": [ + 105, + 79, + 338, + 97 + ], + "score": 1.0, + "content": "For second-order tensor, we have the following corollary.", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 106, + 97, + 505, + 135 + ], + "lines": [ + { + "bbox": [ + 104, + 96, + 506, + 111 + ], + "spans": [ + { + "bbox": [ + 104, + 96, + 228, + 111 + ], + "score": 1.0, + "content": "Lemma 31. 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(2014) on the stability of a matrix’s eigendecomposition under perturbation. Let", + "type": "text" + }, + { + "bbox": [ + 492, + 179, + 504, + 189 + ], + "score": 0.81, + "content": "M", + "type": "inline_equation" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 189, + 433, + 203 + ], + "spans": [ + { + "bbox": [ + 106, + 191, + 123, + 203 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 189, + 136, + 201 + ], + "score": 0.85, + "content": "\\hat { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 136, + 191, + 165, + 203 + ], + "score": 1.0, + "content": "be two", + "type": "text" + }, + { + "bbox": [ + 166, + 192, + 191, + 202 + ], + "score": 0.88, + "content": "n \\times n", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 191, + 262, + 203 + ], + "score": 1.0, + "content": "mtrices such that", + "type": "text" + }, + { + "bbox": [ + 263, + 190, + 322, + 201 + ], + "score": 0.92, + "content": "M = U D U ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 323, + 191, + 341, + 203 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 341, + 190, + 430, + 203 + ], + "score": 0.92, + "content": "\\hat { M } = M ( I + E ) + F", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 191, + 433, + 203 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 107, + 204, + 474, + 217 + ], + "lines": [ + { + "bbox": [ + 105, + 202, + 474, + 219 + ], + "spans": [ + { + "bbox": [ + 105, + 202, + 354, + 219 + ], + "score": 1.0, + "content": "Definition 3 (Definition A.1 in Bhaskara et al. (2014)). Let se", + "type": "text" + }, + { + "bbox": [ + 355, + 204, + 470, + 218 + ], + "score": 0.81, + "content": "\\begin{array} { r } { p ( D ) = \\operatorname* { m i n } _ { i \\neq j } | D _ { i i } - D _ { j j } | . } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 202, + 474, + 219 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 108, + 226, + 504, + 249 + ], + "lines": [ + { + "bbox": [ + 105, + 225, + 506, + 240 + ], + "spans": [ + { + "bbox": [ + 105, + 225, + 338, + 240 + ], + "score": 1.0, + "content": "The following Lemma guarantees that the eigenvalues of", + "type": "text" + }, + { + "bbox": [ + 339, + 225, + 351, + 237 + ], + "score": 0.87, + "content": "\\hat { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 225, + 506, + 240 + ], + "score": 1.0, + "content": "are distinct if the perturbation are not", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 236, + 147, + 251 + ], + "spans": [ + { + "bbox": [ + 105, + 236, + 147, + 251 + ], + "score": 1.0, + "content": "too large.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9.5 + }, + { + "type": "text", + "bbox": [ + 108, + 250, + 504, + 276 + ], + "lines": [ + { + "bbox": [ + 105, + 249, + 505, + 265 + ], + "spans": [ + { + "bbox": [ + 105, + 249, + 330, + 265 + ], + "score": 1.0, + "content": "Lemma 32 (Lemma A.2 in Bhaskara et al. (2014)). If", + "type": "text" + }, + { + "bbox": [ + 330, + 251, + 481, + 264 + ], + "score": 0.92, + "content": "\\kappa ( U ) ( \\| M E \\| + \\| F \\| ) < s e p ( D ) / 2 n ,", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 249, + 505, + 265 + ], + "score": 1.0, + "content": ", then", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 262, + 321, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 181, + 277 + ], + "score": 1.0, + "content": "the eigenvalues of", + "type": "text" + }, + { + "bbox": [ + 181, + 262, + 192, + 275 + ], + "score": 0.79, + "content": "\\hat { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 263, + 321, + 277 + ], + "score": 1.0, + "content": "are distinct and diagonalizable.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11.5 + }, + { + "type": "text", + "bbox": [ + 106, + 283, + 485, + 295 + ], + "lines": [ + { + "bbox": [ + 104, + 281, + 487, + 299 + ], + "spans": [ + { + "bbox": [ + 104, + 281, + 487, + 299 + ], + "score": 1.0, + "content": "The following Lemma further upperbound the difference between corresponding eigenvectors.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 13 + }, + { + "type": "text", + "bbox": [ + 106, + 297, + 506, + 339 + ], + "lines": [ + { + "bbox": [ + 105, + 297, + 505, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 297, + 330, + 311 + ], + "score": 1.0, + "content": "Lemma 33 (Lemma A.3 in Bhaskara et al. (2014)). Let", + "type": "text" + }, + { + "bbox": [ + 330, + 299, + 370, + 309 + ], + "score": 0.88, + "content": "u _ { 1 } , . . . , u _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 297, + 388, + 311 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 388, + 298, + 428, + 309 + ], + "score": 0.92, + "content": "\\hat { u } _ { 1 } , . . . , \\hat { u } _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 297, + 505, + 311 + ], + "score": 1.0, + "content": "respectively be the", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 308, + 505, + 324 + ], + "spans": [ + { + "bbox": [ + 105, + 308, + 169, + 324 + ], + "score": 1.0, + "content": "eigenvectors of", + "type": "text" + }, + { + "bbox": [ + 169, + 310, + 181, + 320 + ], + "score": 0.6, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 308, + 200, + 324 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 200, + 308, + 212, + 320 + ], + "score": 0.82, + "content": "\\hat { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 212, + 308, + 404, + 324 + ], + "score": 1.0, + "content": ", ordered by their corresponding eigenvalues. If", + "type": "text" + }, + { + "bbox": [ + 405, + 309, + 505, + 322 + ], + "score": 0.89, + "content": "\\kappa ( U ) ( \\| M E \\| + \\| F \\| ) <", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 103, + 319, + 408, + 337 + ], + "spans": [ + { + "bbox": [ + 103, + 319, + 408, + 337 + ], + "score": 1.0, + "content": "sep(D)/2n, then for all i we have kuˆi − uik ≤ 3 σmax(E)σmax(D)+σmax(F ) .", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 105, + 344, + 484, + 357 + ], + "lines": [ + { + "bbox": [ + 105, + 344, + 486, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 344, + 306, + 358 + ], + "score": 1.0, + "content": "In the setting of simultaneous diagonalization, let", + "type": "text" + }, + { + "bbox": [ + 306, + 345, + 368, + 356 + ], + "score": 0.92, + "content": "N _ { a } = T _ { a } + E _ { a }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 344, + 386, + 358 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 386, + 345, + 446, + 356 + ], + "score": 0.92, + "content": "N _ { b } = T _ { b } + E _ { b }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 344, + 486, + 358 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17 + }, + { + "type": "interline_equation", + "bbox": [ + 239, + 357, + 370, + 372 + ], + "lines": [ + { + "bbox": [ + 239, + 357, + 370, + 372 + ], + "spans": [ + { + "bbox": [ + 239, + 357, + 370, + 372 + ], + "score": 0.9, + "content": "N _ { a } N _ { b } ^ { - 1 } = T _ { a } T _ { b } ^ { - 1 } ( I + F ) + G ,", + "type": "interline_equation", + "image_path": "5c9e989f923b852130721270de882117c598cb0f5e5fded9ebf693371cf48bbe.jpg" + } + ] + } + ], + "index": 18, + "virtual_lines": [ + { + "bbox": [ + 239, + 357, + 370, + 372 + ], + "spans": [], + "index": 18 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 374, + 505, + 398 + ], + "lines": [ + { + "bbox": [ + 102, + 371, + 507, + 391 + ], + "spans": [ + { + "bbox": [ + 102, + 371, + 133, + 391 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 374, + 256, + 388 + ], + "score": 0.92, + "content": "F = - E _ { b } ( I + T _ { b } ^ { - 1 } E _ { b } ) ^ { - 1 } T _ { b } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 371, + 274, + 391 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 274, + 375, + 328, + 388 + ], + "score": 0.93, + "content": "G = E _ { a } N _ { b } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 371, + 507, + 391 + ], + "score": 1.0, + "content": ". The following lemma bound the maximum", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 386, + 295, + 399 + ], + "spans": [ + { + "bbox": [ + 106, + 386, + 255, + 399 + ], + "score": 1.0, + "content": "singular value of perturbation matrix", + "type": "text" + }, + { + "bbox": [ + 255, + 388, + 264, + 397 + ], + "score": 0.84, + "content": "F", + "type": "inline_equation" + }, + { + "bbox": [ + 265, + 386, + 282, + 399 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 283, + 388, + 291, + 397 + ], + "score": 0.8, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 386, + 295, + 399 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19.5 + }, + { + "type": "text", + "bbox": [ + 106, + 401, + 505, + 434 + ], + "lines": [ + { + "bbox": [ + 102, + 398, + 505, + 419 + ], + "spans": [ + { + "bbox": [ + 102, + 398, + 440, + 419 + ], + "score": 1.0, + "content": "Lemma 34 (Claim A.5 in Bhaskara et al. (2014)). σmax(F ) ≤ σmax(Eb)σmin(Tb)−σmax(Eb)", + "type": "text" + }, + { + "bbox": [ + 436, + 402, + 455, + 415 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 455, + 402, + 505, + 415 + ], + "score": 0.86, + "content": "\\sigma _ { \\operatorname* { m a x } } ( G ) \\leq", + "type": "inline_equation" + } + ], + "index": 21 + }, + { + "bbox": [ + 108, + 415, + 144, + 434 + ], + "spans": [ + { + "bbox": [ + 108, + 415, + 144, + 434 + ], + "score": 0.67, + "content": "\\frac { \\sigma _ { \\operatorname* { m a x } } ( E _ { a } ) } { \\sigma _ { \\operatorname* { m i n } } ( N _ { b } ) }", + "type": "inline_equation" + } + ], + "index": 22 + } + ], + "index": 21.5 + }, + { + "type": "text", + "bbox": [ + 106, + 446, + 506, + 484 + ], + "lines": [ + { + "bbox": [ + 105, + 445, + 506, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 456, + 459 + ], + "score": 1.0, + "content": "Alignment of Subspace Basis. Due to the rotation issue, we cannot conclude that", + "type": "text" + }, + { + "bbox": [ + 456, + 445, + 493, + 459 + ], + "score": 0.94, + "content": "\\| S - { \\hat { S } } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 445, + 506, + 459 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 456, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 104, + 456, + 189, + 473 + ], + "score": 1.0, + "content": "small even we know", + "type": "text" + }, + { + "bbox": [ + 190, + 457, + 251, + 471 + ], + "score": 0.93, + "content": "\\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 456, + 506, + 473 + ], + "score": 1.0, + "content": "is bounded. The following Lemma shows that after appropriate", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 471, + 244, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 151, + 484 + ], + "score": 1.0, + "content": "alignment,", + "type": "text" + }, + { + "bbox": [ + 151, + 473, + 159, + 482 + ], + "score": 0.81, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 471, + 232, + 484 + ], + "score": 1.0, + "content": "is indeed close to", + "type": "text" + }, + { + "bbox": [ + 232, + 471, + 240, + 482 + ], + "score": 0.84, + "content": "\\hat { S }", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 471, + 244, + 484 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 108, + 486, + 440, + 500 + ], + "lines": [ + { + "bbox": [ + 105, + 484, + 442, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 349, + 501 + ], + "score": 1.0, + "content": "Lemma 35 (Lemma 6 in Ge et al. (2017a)). Given matrices", + "type": "text" + }, + { + "bbox": [ + 349, + 486, + 401, + 499 + ], + "score": 0.92, + "content": "S , \\hat { S } \\in \\mathbb { R } ^ { d \\times r }", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 484, + 442, + 501 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26 + }, + { + "type": "interline_equation", + "bbox": [ + 202, + 501, + 409, + 531 + ], + "lines": [ + { + "bbox": [ + 202, + 501, + 409, + 531 + ], + "spans": [ + { + "bbox": [ + 202, + 501, + 409, + 531 + ], + "score": 0.93, + "content": "\\operatorname* { m i n } _ { Z ^ { \\top } Z = Z Z ^ { \\top } = I _ { r } } \\| \\hat { S } - S Z \\| _ { F } ^ { 2 } \\leq \\frac { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } ^ { 2 } } { 2 ( \\sqrt { 2 } - 1 ) \\sigma _ { r } ( S S ^ { \\top } ) }", + "type": "interline_equation", + "image_path": "d8cc3bace7b9a40429c1e91f75c34da0a9b0c2052c79b649c7e9e5a868e64e47.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 202, + 501, + 409, + 531 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 541, + 364, + 554 + ], + "lines": [ + { + "bbox": [ + 106, + 541, + 365, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 541, + 365, + 554 + ], + "score": 1.0, + "content": "D.3 SMALLEST SINGULAR VALUE OF RANDOM MATRICES", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 106, + 561, + 504, + 585 + ], + "lines": [ + { + "bbox": [ + 106, + 562, + 506, + 575 + ], + "spans": [ + { + "bbox": [ + 106, + 562, + 506, + 575 + ], + "score": 1.0, + "content": "For a random rectangular matrix where each element is an inpdependent Gaussian variable, Rudel-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 573, + 311, + 586 + ], + "spans": [ + { + "bbox": [ + 105, + 573, + 311, + 586 + ], + "score": 1.0, + "content": "son & Vershynin (2009) gives the following result:", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29.5 + }, + { + "type": "text", + "bbox": [ + 106, + 586, + 505, + 632 + ], + "lines": [ + { + "bbox": [ + 105, + 585, + 505, + 600 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 378, + 600 + ], + "score": 1.0, + "content": "Lemma 36 (Theorem 1.1 in Rudelson & Vershynin (2009)). Let", + "type": "text" + }, + { + "bbox": [ + 379, + 587, + 430, + 597 + ], + "score": 0.91, + "content": "A \\in R ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 585, + 505, + 600 + ], + "score": 1.0, + "content": "and suppose that", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 107, + 597, + 505, + 611 + ], + "spans": [ + { + "bbox": [ + 107, + 599, + 137, + 609 + ], + "score": 0.89, + "content": "m \\geq n", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 597, + 251, + 611 + ], + "score": 1.0, + "content": ". 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If", + "type": "text" + }, + { + "bbox": [ + 405, + 309, + 505, + 322 + ], + "score": 0.89, + "content": "\\kappa ( U ) ( \\| M E \\| + \\| F \\| ) <", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 103, + 319, + 408, + 337 + ], + "spans": [ + { + "bbox": [ + 103, + 319, + 408, + 337 + ], + "score": 1.0, + "content": "sep(D)/2n, then for all i we have kuˆi − uik ≤ 3 σmax(E)σmax(D)+σmax(F ) .", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 15, + "bbox_fs": [ + 103, + 297, + 505, + 337 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 344, + 484, + 357 + ], + "lines": [ + { + "bbox": [ + 105, + 344, + 486, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 344, + 306, + 358 + ], + "score": 1.0, + "content": "In the setting of simultaneous diagonalization, let", + "type": "text" + }, + { + "bbox": [ + 306, + 345, + 368, + 356 + ], + "score": 0.92, + "content": "N _ { a } = T _ { a } + E _ { a }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 344, + 386, + 358 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 386, + 345, + 446, + 356 + ], + "score": 0.92, + "content": "N _ { b } = T _ { b } + E _ { b }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 344, + 486, + 358 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17, + "bbox_fs": [ + 105, + 344, + 486, + 358 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 239, + 357, + 370, + 372 + ], + "lines": [ + { + "bbox": [ + 239, + 357, + 370, + 372 + ], + "spans": [ + { + "bbox": [ + 239, + 357, + 370, + 372 + ], + "score": 0.9, + "content": "N _ { a } N _ { b } ^ { - 1 } = T _ { a } T _ { b } ^ { - 1 } ( I + F ) + G ,", + "type": "interline_equation", + "image_path": "5c9e989f923b852130721270de882117c598cb0f5e5fded9ebf693371cf48bbe.jpg" + } + ] + } + ], + "index": 18, + "virtual_lines": [ + { + "bbox": [ + 239, + 357, + 370, + 372 + ], + "spans": [], + "index": 18 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 374, + 505, + 398 + ], + "lines": [ + { + "bbox": [ + 102, + 371, + 507, + 391 + ], + "spans": [ + { + "bbox": [ + 102, + 371, + 133, + 391 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 374, + 256, + 388 + ], + "score": 0.92, + "content": "F = - E _ { b } ( I + T _ { b } ^ { - 1 } E _ { b } ) ^ { - 1 } T _ { b } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 371, + 274, + 391 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 274, + 375, + 328, + 388 + ], + "score": 0.93, + "content": "G = E _ { a } N _ { b } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 371, + 507, + 391 + ], + "score": 1.0, + "content": ". The following lemma bound the maximum", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 386, + 295, + 399 + ], + "spans": [ + { + "bbox": [ + 106, + 386, + 255, + 399 + ], + "score": 1.0, + "content": "singular value of perturbation matrix", + "type": "text" + }, + { + "bbox": [ + 255, + 388, + 264, + 397 + ], + "score": 0.84, + "content": "F", + "type": "inline_equation" + }, + { + "bbox": [ + 265, + 386, + 282, + 399 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 283, + 388, + 291, + 397 + ], + "score": 0.8, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 386, + 295, + 399 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19.5, + "bbox_fs": [ + 102, + 371, + 507, + 399 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 401, + 505, + 434 + ], + "lines": [ + { + "bbox": [ + 102, + 398, + 505, + 419 + ], + "spans": [ + { + "bbox": [ + 102, + 398, + 440, + 419 + ], + "score": 1.0, + "content": "Lemma 34 (Claim A.5 in Bhaskara et al. (2014)). σmax(F ) ≤ σmax(Eb)σmin(Tb)−σmax(Eb)", + "type": "text" + }, + { + "bbox": [ + 436, + 402, + 455, + 415 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 455, + 402, + 505, + 415 + ], + "score": 0.86, + "content": "\\sigma _ { \\operatorname* { m a x } } ( G ) \\leq", + "type": "inline_equation" + } + ], + "index": 21 + }, + { + "bbox": [ + 108, + 415, + 144, + 434 + ], + "spans": [ + { + "bbox": [ + 108, + 415, + 144, + 434 + ], + "score": 0.67, + "content": "\\frac { \\sigma _ { \\operatorname* { m a x } } ( E _ { a } ) } { \\sigma _ { \\operatorname* { m i n } } ( N _ { b } ) }", + "type": "inline_equation" + } + ], + "index": 22 + } + ], + "index": 21.5, + "bbox_fs": [ + 102, + 398, + 505, + 434 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 446, + 506, + 484 + ], + "lines": [ + { + "bbox": [ + 105, + 445, + 506, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 456, + 459 + ], + "score": 1.0, + "content": "Alignment of Subspace Basis. Due to the rotation issue, we cannot conclude that", + "type": "text" + }, + { + "bbox": [ + 456, + 445, + 493, + 459 + ], + "score": 0.94, + "content": "\\| S - { \\hat { S } } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 445, + 506, + 459 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 456, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 104, + 456, + 189, + 473 + ], + "score": 1.0, + "content": "small even we know", + "type": "text" + }, + { + "bbox": [ + 190, + 457, + 251, + 471 + ], + "score": 0.93, + "content": "\\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\|", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 456, + 506, + 473 + ], + "score": 1.0, + "content": "is bounded. The following Lemma shows that after appropriate", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 471, + 244, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 151, + 484 + ], + "score": 1.0, + "content": "alignment,", + "type": "text" + }, + { + "bbox": [ + 151, + 473, + 159, + 482 + ], + "score": 0.81, + "content": "S", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 471, + 232, + 484 + ], + "score": 1.0, + "content": "is indeed close to", + "type": "text" + }, + { + "bbox": [ + 232, + 471, + 240, + 482 + ], + "score": 0.84, + "content": "\\hat { S }", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 471, + 244, + 484 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24, + "bbox_fs": [ + 104, + 445, + 506, + 484 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 486, + 440, + 500 + ], + "lines": [ + { + "bbox": [ + 105, + 484, + 442, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 349, + 501 + ], + "score": 1.0, + "content": "Lemma 35 (Lemma 6 in Ge et al. (2017a)). Given matrices", + "type": "text" + }, + { + "bbox": [ + 349, + 486, + 401, + 499 + ], + "score": 0.92, + "content": "S , \\hat { S } \\in \\mathbb { R } ^ { d \\times r }", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 484, + 442, + 501 + ], + "score": 1.0, + "content": ", we have", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26, + "bbox_fs": [ + 105, + 484, + 442, + 501 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 202, + 501, + 409, + 531 + ], + "lines": [ + { + "bbox": [ + 202, + 501, + 409, + 531 + ], + "spans": [ + { + "bbox": [ + 202, + 501, + 409, + 531 + ], + "score": 0.93, + "content": "\\operatorname* { m i n } _ { Z ^ { \\top } Z = Z Z ^ { \\top } = I _ { r } } \\| \\hat { S } - S Z \\| _ { F } ^ { 2 } \\leq \\frac { \\| S S ^ { \\top } - \\hat { S } \\hat { S } ^ { \\top } \\| _ { F } ^ { 2 } } { 2 ( \\sqrt { 2 } - 1 ) \\sigma _ { r } ( S S ^ { \\top } ) }", + "type": "interline_equation", + "image_path": "d8cc3bace7b9a40429c1e91f75c34da0a9b0c2052c79b649c7e9e5a868e64e47.jpg" + } + ] + } + ], + "index": 27, + "virtual_lines": [ + { + "bbox": [ + 202, + 501, + 409, + 531 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 541, + 364, + 554 + ], + "lines": [ + { + "bbox": [ + 106, + 541, + 365, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 541, + 365, + 554 + ], + "score": 1.0, + "content": "D.3 SMALLEST SINGULAR VALUE OF RANDOM MATRICES", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28, + "bbox_fs": [ + 106, + 541, + 365, + 554 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 561, + 504, + 585 + ], + "lines": [ + { + "bbox": [ + 106, + 562, + 506, + 575 + ], + "spans": [ + { + "bbox": [ + 106, + 562, + 506, + 575 + ], + "score": 1.0, + "content": "For a random rectangular matrix where each element is an inpdependent Gaussian variable, Rudel-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 573, + 311, + 586 + ], + "spans": [ + { + "bbox": [ + 105, + 573, + 311, + 586 + ], + "score": 1.0, + "content": "son & Vershynin (2009) gives the following result:", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 29.5, + "bbox_fs": [ + 105, + 562, + 506, + 586 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 586, + 505, + 632 + ], + "lines": [ + { + "bbox": [ + 105, + 585, + 505, + 600 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 378, + 600 + ], + "score": 1.0, + "content": "Lemma 36 (Theorem 1.1 in Rudelson & Vershynin (2009)). Let", + "type": "text" + }, + { + "bbox": [ + 379, + 587, + 430, + 597 + ], + "score": 0.91, + "content": "A \\in R ^ { m \\times n }", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 585, + 505, + 600 + ], + "score": 1.0, + "content": "and suppose that", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 107, + 597, + 505, + 611 + ], + "spans": [ + { + "bbox": [ + 107, + 599, + 137, + 609 + ], + "score": 0.89, + "content": "m \\geq n", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 597, + 251, + 611 + ], + "score": 1.0, + "content": ". Assume that the entries of", + "type": "text" + }, + { + "bbox": [ + 252, + 599, + 260, + 608 + ], + "score": 0.67, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 597, + 505, + 611 + ], + "score": 1.0, + "content": "are independent standard Gaussian variable, then for every", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 607, + 506, + 624 + ], + "spans": [ + { + "bbox": [ + 106, + 611, + 131, + 621 + ], + "score": 0.87, + "content": "\\epsilon > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 607, + 233, + 624 + ], + "score": 1.0, + "content": ", with probability at least", + "type": "text" + }, + { + "bbox": [ + 233, + 609, + 337, + 622 + ], + "score": 0.92, + "content": "1 - ( C \\epsilon ) ^ { m - n + \\bar { 1 } } + e ^ { - C ^ { \\prime } n }", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 607, + 368, + 624 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 369, + 610, + 392, + 622 + ], + "score": 0.9, + "content": "C , C ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 607, + 506, + 624 + ], + "score": 1.0, + "content": "are two absolute constants,", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 621, + 145, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 621, + 145, + 633 + ], + "score": 1.0, + "content": "we have:", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 32.5, + "bbox_fs": [ + 105, + 585, + 506, + 633 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 247, + 630, + 364, + 645 + ], + "lines": [ + { + "bbox": [ + 247, + 630, + 364, + 645 + ], + "spans": [ + { + "bbox": [ + 247, + 630, + 364, + 645 + ], + "score": 0.9, + "content": "\\sigma _ { n } ( A ) \\geq \\epsilon ( { \\sqrt { m } } - { \\sqrt { n - 1 } } ) .", + "type": "interline_equation", + "image_path": "e272fb4b3b788a188739cac1a8807ff6ee40d6e30eefa315cdec25ad73ab61dd.jpg" + } + ] + } + ], + "index": 35, + "virtual_lines": [ + { + "bbox": [ + 247, + 630, + 364, + 645 + ], + "spans": [], + "index": 35 + } + ] + }, + { + "type": "list", + "bbox": [ + 106, + 651, + 504, + 673 + ], + "lines": [ + { + "bbox": [ + 106, + 651, + 504, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 651, + 504, + 663 + ], + "score": 1.0, + "content": "However, in our setting, we are more interested in fixed matrices perturbed by Gaussian variables.", + "type": "text" + } + ], + "index": 36, + "is_list_end_line": true + }, + { + "bbox": [ + 106, + 661, + 495, + 674 + ], + "spans": [ + { + "bbox": [ + 106, + 661, + 495, + 674 + ], + "score": 1.0, + "content": "The smallest singular value of these “perturbed rectangular matrices” can be bounded as follows.", + "type": "text" + } + ], + "index": 37, + "is_list_start_line": true, + "is_list_end_line": true + } + ], + "index": 36.5, + "bbox_fs": [ + 106, + 651, + 504, + 674 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 675, + 505, + 713 + ], + "lines": [ + { + "bbox": [ + 104, + 673, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 104, + 673, + 312, + 689 + ], + "score": 1.0, + "content": "Lemma 37 (Lemma G.16 in Ge et al. 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Input: Samples (x1, y1),., (xn,yn) generated according to Equation (3).
Output: Estimate of weight vector w. n
1:Estimate U =1 ∑i=1yixi. n
2:Estimate C= 3: return 2C-1v.Ci=1xixi T
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Output: Weight matrices W_and A.Input: Samples (x1, y1),.,(xn, yn) generated according to Equation (4)
1: {Finding span of vec(zizT)’s}
2: Estimate empirical moments E[xxT],E[yxT],E[yx@3] and E[y y (x x)].
3: Compute the vector f(u) = 2E[(uTy).(E[(uTy)xT]E[xxT]-1x)·(xx)]-E[(uTy)²(x凶x)]
where each entry is expressed as a degree-2 polynomial over u.
4:: Construct matrix T ∈ Rd²×(k2+k) such that,Tvec*(uuT) = f(u).
5:Compute the k-least right singular vectors of T,denoted by vec*(U1), vec*(U2),.: , vec*(Uk). Let S be a k2 + k by k matrix, where the i-th column of S is vector vec*(Ui). {Here span S is
equal to span of {vec*(ziz𝑖)}.} 6:{Finding zi's from span}
7: Let X = mat*(SSi), Y = mat*(SS2), where S1 and S2 are two independently sampled k-
8:dimensional standard Gaussian vectors. :Let z1,.,zk be eigenvectors of XY-1.
9:For each zi,ifE[zTy] <O let zi ← -zi. {Here zi's are normalized rows of A-1.}
10:{Reduce to 1-Layer Problem}
11:For each zi,let Ui be the output of Algorithm 1 with input (x1,zi y1),., (xn, zi yn).
13:return V,Z-1.12: Let Z be the matrix whose rows are zT's, V be the matrix whose rows are vi 's.
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\\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ( x \\otimes x ) ^ { \\top } \\big ] . } \\end{array}" + }, + { + "category_id": 13, + "poly": [ + 789, + 675, + 1107, + 675, + 1107, + 713, + 789, + 713 + ], + "score": 0.92, + "latex": "\\epsilon \\leq \\gamma / 2 \\leq \\sigma _ { \\operatorname* { m i n } } ( \\mathbb { E } [ x x ^ { \\top } ] ) / 2" + }, + { + "category_id": 14, + "poly": [ + 443, + 746, + 1251, + 746, + 1251, + 830, + 443, + 830 + ], + "score": 0.92, + "latex": "\\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\right\\| \\leq 2 \\sqrt { 2 } \\frac { \\left\\| \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] - \\mathbb { E } \\big [ x x ^ { \\top } \\big ] \\right\\| } { \\sigma _ { \\operatorname* { m i n } } ^ { 2 } ( \\mathbb { E } [ x x ^ { \\top } ] ) } \\leq 2 \\sqrt { 2 } \\epsilon / \\gamma ^ { 2 } ," + }, + { + "category_id": 13, + "poly": [ + 699, + 893, + 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\\otimes x \\big ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { E } \\big [ x \\otimes x \\big ] \\right| . } \\end{array}" + }, + { + "category_id": 14, + "poly": [ + 560, + 1294, + 1135, + 1294, + 1135, + 1354, + 560, + 1354 + ], + "score": 0.9, + "latex": "\\begin{array} { r } { \\left| \\left| \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\hat { \\mathbb { E } } [ x \\otimes x ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { E } [ x \\otimes x ] \\right| \\right| \\leq \\epsilon , } \\end{array}" + }, + { + "category_id": 14, + "poly": [ + 572, + 477, + 1123, + 477, + 1123, + 538, + 572, + 538 + ], + "score": 0.89, + "latex": "\\begin{array} { r } { \\left| \\left| \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] \\right| \\right| \\leq \\epsilon , } \\end{array}" + }, + { + "category_id": 14, + "poly": [ + 310, + 1792, + 1428, + 1792, + 1428, + 2046, + 310, + 2046 + ], + "score": 0.88, + "latex": "\\begin{array} { r l } & { | 2 \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) \\cdot ( \\hat { \\mathbb { E } } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\hat { \\mathbb { E } } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] - 2 \\mathbb { E } \\big [ ( u ^ { \\top } y ) \\cdot ( \\mathbb { E } [ ( u ^ { \\top } y ) x ^ { \\top } ] \\mathbb { E } [ x x ^ { \\top } ] ^ { - 1 } x ) \\cdot ( x \\otimes x ) \\big ] } \\\\ & { \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } ( x \\otimes x ) \\big ] | \\leq \\epsilon , } \\\\ & { | \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\hat { \\mathbb { E } } [ x \\otimes x ] - \\mathbb { E } \\big [ ( u ^ { \\top } y ) ^ { 2 } \\big ] \\mathbb { E } [ x \\otimes x ] | \\Big \\| \\leq \\epsilon , } \\\\ & { | 2 \\Big ( \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { \\mathbb { E } } [ x \\otimes x ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\mathbb { E } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\mathbb { E } [ x \\otimes x ] \\Big | } \\\\ & { ] 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\hat { \\mathbb { E } } \\big [ x x ^ { \\top } \\big ] ^ { - 1 } \\hat { \\mathbb { E } } \\big [ ( u ^ { \\top } y ) x \\big ] \\Big ) \\hat { \\mathbb { E } } [ x \\otimes x ] - 2 \\Big ( \\mathbb { E } \\big [ ( u ^ { \\top } y ) x ^ { \\top } \\big ] \\mathbb { E } \\big 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We call the ability to create images of novel semantic concepts visually grounded imagination. In this paper, we show how we can modify variational auto-encoders to perform this task. Our method uses a novel training objective, and a novel product-of-experts inference network, which can handle partially specified (abstract) concepts in a principled and efficient way. We also propose a set of easy-to-compute evaluation metrics that capture our intuitive notions of what it means to have good visual imagination, namely correctness, coverage, and compositionality (the $3 \ : C ' s$ ). Finally, we perform a detailed comparison of our method with two existing joint image-attribute VAE methods (the JMVAE method of Suzuki et al. (2017) and the BiVCCA method of Wang et al. (2016b)) by applying them to two datasets: the MNIST-with-attributes dataset (which we introduce here), and the CelebA dataset (Liu et al., 2015). + +# 1 INTRODUCTION + +Consider the following two-party communication game: a speaker thinks of a visual concept $C$ , such as “men with black hair”, and then generates a description $\mathbf { y }$ of this concept, which she sends to a listener; the listener interprets the description y, by creating an internal representation $\mathbf { z }$ , which captures its “meaning”. We can think of $\mathbf { z }$ as representing a set of “mental images” which depict the concept $C$ . To test whether the listener has correctly “understood” the concept, we ask him to draw a set of real images $S = \{ \mathbf { x } _ { s } : s = 1 : S \}$ , which depict the concept $C$ . He then sends these back to the speaker, who checks to see if the images correctly match the concept $C$ . We call this process visually grounded imagination. + +In this paper, we represent concept descriptions in terms of a fixed length vector of discrete attributes $\mathcal { A }$ . This allows us to specify an exponentially large set of concepts using a compact, combinatorial representation. In particular, by specifying different subsets of attributes, we can generate concepts at different levels of granularity or abstraction. We can arrange these concepts into a compositional abstraction hierarchy, as shown in Figure 1. This is a directed acyclic graph (DAG) in which nodes represent concepts, and an edge from a node to its parent is added whenever we drop one of the attributes from the child’s concept definition. Note that we dont make any assumptions about the order in which the attributes are dropped (that is, dropping the attribute “smiling” is just as valid as dropping “female” in Figure 1). Thus, the tree shown in the figure is just a subset extracted from the full DAG of concepts, shown for illustration purposes. + +We can describe a concept by creating the attribute vector $\mathbf { y } _ { \mathcal { O } }$ , in which we only specify the value of the attributes in the subset $\mathcal { O } \subseteq A$ ; the remaining attributes are unspecified, and are assumed to take all possible legal values. For example, consider the following concepts, in order of increasing abstraction: $C _ { m s b } =$ (male, smiling, blackhair), $C _ { * s b } = ( *$ , smiling, blackhair), and $C _ { * * b } = ( * , * , \mathrm { b l a c k h a i r } )$ , where the attributes are gender, smiling or not, and hair color, and $^ *$ represents “don’t care”. A good model should be able to generate images from different levels of the abstraction hierarchy, as shown in Figure 1. (This is in contrast to most prior work on conditional generative models of images, which assume that all attributes are fully specified, which corresponds to sampling only from leaf nodes in the hierarchy.) + +![](images/df5ae9ce9cf733cf7373f02ab07cee5213fc9e1882dff1aa502a1f29fdf95c60.jpg) +Figure 1: A compositional abstraction hierarchy for faces, derived from 3 attributes: hair color, smiling or not, and gender. We show a set of sample images generated by our model, when trained on CelebA, for different nodes in this hierarchy. + +In Section 2, we show how we can extend the variational autoencoder (VAE) framework of Kingma & Welling (2014) to create models which can perform this task. The first extension is to modify the model to the “multi-modal” setting where we have both an image, x, and an attribute vector, y. More precisely, we assume a joint generative model of the form $\begin{array} { r } { p ( \mathbf { x } , \mathbf { y } , \mathbf { z } ) = p ( \mathbf { z } ) p ( \mathbf { x } | \mathbf { z } ) p ( \mathbf { y } | \mathbf { z } ) } \end{array}$ , where $p ( \mathbf { z } )$ is the prior over the latent variable $\mathbf { z }$ , $p ( \mathbf { x } | \mathbf { z } )$ is our image decoder, and $p ( \mathbf { y } \vert \mathbf { z } )$ is our description decoder. We additionally assume that the description decoder factorizes over the specified attributes in the description, so $\begin{array} { r } { p ( \mathbf { \dot { y } } _ { \mathcal { O } } | \mathbf { z } ) = \prod _ { k \in \mathcal { O } } p ( y _ { k } | \mathbf { z } ) } \end{array}$ . + +We further extend the VAE by devising a novel objective function, which we call the TELBO, for training the model from paired data, $\bar { \cal D } \bar { \bf \Delta } = \{ ( { \bf x } _ { n } , { \bf y } _ { n } ) \}$ . However, at test time, we will allow unpaired data (either just a description or just an image). Hence we fit three inference networks: $q ( \mathbf { z } | \mathbf { x } , \mathbf { y } )$ , $q ( \mathbf { z } | \mathbf { x } )$ and $q ( \mathbf { z } | \mathbf { y } )$ . This way we can embed an image or a description into the same shared latent space (using $q ( \mathbf { z } | \mathbf { x } )$ and $q ( \mathbf { z } | \mathbf { y } )$ , respectively); this lets us “translate” images into descriptions or vice versa, by computing $\begin{array} { r } { p ( \mathbf { y } | \mathbf { x } ) = \int d \mathbf { z } \ p ( \mathbf { y } | \mathbf { z } ) q ( \mathbf { z } | \mathbf { x } ) } \end{array}$ and $\begin{array} { r } { p ( \mathbf { x } | \mathbf { y } ) = \int d \mathbf { z } \ p ( \mathbf { x } | \mathbf { z } ) q ( \mathbf { z } | \mathbf { y } ) } \end{array}$ . + +To handle abstract concepts (i.e., partially observed attribute vectors), we use a method based on the product of experts (POE) (Hinton, 2002). In particular, our inference network for attributes has the form $\begin{array} { r } { q ( \mathbf { z } | \mathbf { y } _ { \mathcal { O } } ) \propto p ( \mathbf { z } ) \prod _ { k \in \mathcal { O } } q ( \mathbf { z } | \mathbf { y } _ { k } ) } \end{array}$ . If no attributes are specified, the posterior is equal to the prior. As we condition on more attributes, the posterior becomes narrower, which corresponds to specifying a more precise concept. This enables us to generate a more diverse set of images to represent abstract concepts, and a less diverse set of images to represent concrete concepts, as we show below. + +Section 3 discusses how to evaluate the performance of our method in an objective way. Specifically, we first “ground” the description by generating a set of images, $\begin{array} { r } { \mathcal { S } ( \mathbf { y } _ { \mathcal { O } } ) = \{ \mathbf { x } ^ { s } \sim p ( \mathbf { x } | \mathbf { y } _ { \mathcal { O } } ) : s = 1 : } \end{array}$ $S \}$ . We then check that all the sampled images in $\scriptstyle { S ( \mathbf { y } _ { \mathcal { O } } ) }$ are consistent with the specified attributes $\mathbf { y } _ { \mathcal { O } }$ (we call this correctness). We also check that the set of images “spans” the extension of the concept, by exhibiting suitable diversity (c.f. (Young et al., 2014)). Concretely, we check that the attributes that were not specified (e.g., gender in $C _ { * s b }$ above) vary across the different images; we call this coverage. Finally, we want the set of images to have high correctness and coverage even if the concept $\mathbf { y } _ { \mathcal { O } }$ has a combination of attribute values that have not been seen in training. For example, if we train on $C _ { m s b } =$ (male, smiling, blackhair), and ${ C _ { f n b } = }$ (female, notsmiling, blackhair), we should be able to test on $C _ { m n b } =$ (male, notsmiling, blackhair), and $C _ { f s b } =$ (female, smiling, blackhair). We will call this property compositionality. Being able to generate plausible images in response to truly compositionally novel queries is the essence of imagination. Together, we call these criteria the 3 C’s of visual imagination. + +Section 5 reports experimental results on two different datasets. The first dataset is a modified version of MNIST, which we call MNIST-with-attributes (or MNIST-A), in which we “render” modified versions of a single MNIST digit on a $6 4 \mathrm { x } 6 4$ canvas, varying its location, orientation and size. The second dataset is CelebA (Liu et al., 2015), which consists of over $2 0 0 \mathrm { k }$ face images, annotated with 40 binary attributes. We show that our method outperforms previous methods on these datasets. + +The contributions of this paper are threefold. First, we present a novel extension to VAEs in the multimodal setting, introducing a principled new training objective (the TELBO), and deriving an interpretation of a previously proposed objective (JMVAE) (Wang et al., 2016a) as a valid alternative in Appendix A.1. Second, we present a novel way to handle missing data in inference networks based on a product of experts. Third, we present novel criteria (the 3 C’s) for evaluating conditional generative models of images, that extends prior work by considering the notion of visual abstraction and imagination. + +# 2 METHODS + +We start by describing standard VAEs, to introduce notation. We then discuss our extensions to handle the multimodal and the missing input settings. + +Standard VAEs. A variational autoencoder (Kingma & Welling, 2014) is a latent variable model of the form $p _ { \pmb { \theta } } ( \mathbf { x } , \mathbf { z } ) = p _ { \pmb { \theta } } ( \mathbf { z } ) p _ { \pmb { \theta } } ( \mathbf { x } | \mathbf { z } )$ , where $p _ { \pmb { \theta } } ( \mathbf { z } )$ is the prior (we assume it is Gaussian, $p _ { \pmb { \theta } } ( \mathbf { z } ) =$ $\mathcal { N } ( \mathbf { z } | \mathbf { 0 } , \mathbf { I } )$ , although this assumption can be relaxed), and $p _ { \pmb { \theta } } ( \mathbf { x } | \mathbf { z } )$ is the likelihood (sometimes called the decoder), usually represented by a neural network. To perform approximate posterior inference, we fit an inference network (sometimes called the encoder) of the form $q _ { \phi } ( \mathbf { z } | \mathbf { x } )$ , so as to maximize $\mathcal { L } ( \pmb \theta , \phi ) = \mathbb { E } _ { \hat { p } ( \mathbf { x } ) } [ \mathrm { e l b o } ( \mathbf { x } , \pmb \theta , \phi ) ]$ , where $\begin{array} { r } { \hat { p } ( \mathbf x ) = \frac { 1 } { N } \sum _ { n = 1 } ^ { N } \delta _ { \mathbf x _ { n } } ( \mathbf x ) } \end{array}$ is the empirical distribution, and ELBO is the evidence lower bound: + +$$ +\mathrm { e l b o } _ { \lambda , \beta } ( \mathbf { x } , \pmb { \theta } , \phi ) = \mathbb { E } _ { q _ { \phi } ( \mathbf { z } | \mathbf { x } , \phi ) } \left[ \lambda \log p _ { \theta } ( \mathbf { x } | \mathbf { z } ) \right] - \beta \mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } ) , p _ { \theta } ( \mathbf { z } ) ) +$$ + +Here $\mathrm { K L } ( p , q )$ is the Kullback Leibler divergence between distributions $p$ and $q$ . By default, $\beta =$ $\lambda = 1$ , in which case we will just write $\mathrm { e l b o } ( { \bf x } , \pmb { \theta } , \phi )$ . However, by using $\beta > 1$ we can encourage the posterior to be closer to the factorial prior $p ( \mathbf { z } ) = \mathcal { N } ( \mathbf { z } | \mathbf { 0 } , \mathbf { I } )$ , which encouarges the latent factors to be “disentangled”, as proved in Achille $\&$ Soatto (2017); this is known as the $\beta$ -VAE trick (Higgins et al., 2017a). And allowing $\lambda > 1$ will be useful later, when we have multiple modalities. + +Joint VAEs and the TELBO. We extend the VAE to model images and attributes by defining the joint distribution $\begin{array} { r } { p _ { \pmb { \theta } } ( \mathbf { x } , \mathbf { y } , \mathbf { z } ) = p _ { \pmb { \theta } } ( \mathbf { z } ) p _ { \pmb { \theta } } ( \mathbf { x } | \mathbf { z } ) p _ { \pmb { \theta } } ( \mathbf { y } | \mathbf { z } ) } \end{array}$ , where $p _ { \pmb { \theta } } ( \mathbf { x } | \mathbf { z } )$ is the image decoder (we use the DCGAN architecture from Radford et al. (2016)), and $p _ { \pmb { \theta } } ( \mathbf { y } | \mathbf { z } )$ is an MLP for the attribute vector. The corresponding training objective which we want to maximize becomes ${ \mathcal { L } } ( \theta , \phi ) =$ $\mathbb { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ \mathrm { e l b o } ( \mathbf { x } , \mathbf { y } , \pmb { \theta } , \phi ) \right]$ , where $\begin{array} { r } { \hat { p } ( \mathbf x , \mathbf y ) = \frac { 1 } { N } \sum _ { n = 1 } ^ { N } \delta _ { \mathbf x _ { n } } ( \mathbf x ) \delta _ { \mathbf y _ { n } } ( \mathbf y _ { n } ) } \end{array}$ is the empirical distribution derived from paired data, and the joint ELBO is given by + +$$ +\begin{array} { r l r } & { } & { \mathrm { e l b o } _ { \lambda _ { x } , \lambda _ { y } , \beta } ( { \bf x } , { \bf y } , \pmb { \theta } _ { x } , \pmb { \theta } _ { y } , \phi ) = \mathbb { E } _ { q _ { \phi } ( { \bf z } | { \bf x } , { \bf y } ) } \left[ \lambda _ { x } \log p _ { \pmb { \theta } _ { x } } ( { \bf x } | { \bf z } ) + \lambda _ { y } \log p _ { \pmb { \theta } _ { y } } ( { \bf y } | { \bf z } ) \right] \quad } \\ & { } & { - \beta \mathrm { K L } ( q _ { \phi } ( { \bf z } | { \bf x } , { \bf y } ) , p _ { \theta } ( { \bf z } ) ) } \end{array} +$$ + +We call this the JVAE (joint VAE) model. We usually set $\beta = 1$ , but set $\lambda _ { y } / \lambda _ { x } > 1$ to to scale up the likelihood from the low dimensional attribute vector, $p _ { \pmb { \theta } } ( \mathbf { y } | \mathbf { z } )$ , to match the likelihood from the high dimensional image, $p _ { \pmb { \theta } } ( \mathbf { x } | \mathbf { z } )$ . + +Having fit the joint model above, we can proceed to train unpaired inference networks $q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } )$ and $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } )$ , so we can embed images and attributes into the same shared latent space. Keeping the $p$ family fixed from the joint model, a natural objective to fit, say, $q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } )$ is to maximize the following:1 + +$$ +\begin{array} { r l } & { \mathcal { L } ( \phi _ { x } | \theta ) = - \mathbb { E } _ { \hat { p } ( \mathbf { x } ) } \left[ \mathrm { K L } ( q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) , p _ { \theta _ { x } } ( \mathbf { z } | \mathbf { x } ) ) \right] } \\ & { \quad \quad \quad = \displaystyle \int \int d \mathbf { x } d \mathbf { z } \hat { p } ( \mathbf { x } ) q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) \left[ - \log q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) - \log p _ { \theta _ { x } } ( \mathbf { x } ) + \log p _ { \theta _ { x } } ( \mathbf { x } | \mathbf { z } ) + \log p _ { \theta } ( \mathbf { z } ) \right] } \\ & { \quad \quad \quad = \mathbb { E } _ { \hat { p } ( \mathbf { x } ) } \left[ \mathrm { e l b o } ( \mathbf { x } , \theta _ { x } , \phi _ { x } ) \right] - \mathbb { E } _ { \hat { p } ( \mathbf { x } ) } \left[ \log p _ { \theta _ { x } } ( \mathbf { x } ) \right] } \end{array} +$$ + +![](images/3626395a8ff14eb60506a0ca4184450c7060dd974d57a894b45710f69c9fe7d6.jpg) +Figure 2: Illustration of the product of experts inference network. Each expert votes for a part of latent space implied by its observed attribute. The final posterior is the intersection of these regions. When all attributes are observed, the posterior will be a narrowly defined Gaussian, but when some attributes are missing, the posterior will be broader. Right: we illustrate how inclusion of the “universal expert” $p ( \mathbf { z } )$ in the product ensures that the posterior is always well-conditioned (close to spherical), even when we are missing some attributes. + +where the last term is constant wrt $\phi _ { x }$ and the model family $p$ , and hence can be dropped. We can use a similar method to fit $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } )$ . Combining these gives the following triple ELBO (TELBO) objective: + +$$ +\begin{array} { r l } & { { \mathcal { L } } ( \theta _ { x } , \theta _ { y } , \phi , \phi _ { x } , \phi _ { y } ) = \mathbf { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ \mathrm { e l b o } _ { 1 , \lambda , 1 } ( \mathbf { x } , \mathbf { y } , \theta _ { x } , \theta _ { y } , \phi ) \right. } \\ & { ~ \left. ~ + \mathrm { e l b o } _ { 1 , 1 } ( \mathbf { x } , \theta _ { x } , \phi _ { x } ) + \mathrm { e l b o } _ { \gamma , 1 } ( \mathbf { y } , \theta _ { y } , \phi _ { y } ) \right] } \end{array} +$$ + +where $\lambda$ and $\gamma$ scale the log likelihood terms $\log p ( \mathbf { y } | \mathbf { z } )$ ; we set these parameters using a validation set. Since we are training the generative model only on aligned data, and simply retrofitting inference networks, we freeze the $p _ { \pmb { \theta } _ { x } } ( \mathbf { x } | \mathbf { z } )$ and $p _ { \pmb { \theta } _ { y } } ( \mathbf { y } | \mathbf { z } )$ terms when training the last two ELBO terms above, and just optimize $q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } )$ and $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } )$ terms. This enables us to optimize all terms in Equation (2) jointly. Alternatively, we can first fit the joint model, and then fit the unimodal inference networks.2 In Section 4, we compare this to other methods for training joint VAEs that have been proposed in the literature. + +Handling missing attributes. In order to handle missing attributes at test time, we use a product of experts model, where each attribute instantiates an expert. We are motivated by prior work (Williams & Nash, 2018) which shows that for a linear factor analysis model, the posterior distribution $p ( \mathbf { z } | \mathbf { y } )$ is a product of $K$ -dimensional Gaussians, one for each visible dimension. Since our model is just a nonlinear extension of factor analysis, we choose the form of the approximate posterior of our inference network, $q ( \mathbf { z } | \mathbf { y } )$ , to be a product of Gaussians, one for each visible feature: $\begin{array} { r } { q ( \mathbf { z } | \mathbf { y } _ { \mathcal { O } } ) \propto p ( \mathbf { z } ) \prod _ { k \in \mathcal { O } } q ( \mathbf { z } | y _ { k } ) } \end{array}$ , where $q ( \mathbf { z } | y _ { k } ) { \overset { \cdot } { = } } { \mathcal { N } } ( \mathbf { z } | \mu _ { k } ( y _ { k } ) , \mathbf { C } _ { k } ( y _ { k } ) )$ is the kth Gaussian “expert”, and $p ( \mathbf { z } ) = \mathcal { N } ( \mathbf { z } | \boldsymbol { \mu } _ { 0 } = \mathbf { 0 } , \mathbf { C } _ { 0 } = \mathbf { I } )$ is the prior. A similar model was concurrently proposed in Bouchacourt et al. (2018) to perform inference for a set of images. Unlike the product of experts model in (Hinton, 2002), our model multiplies Gaussians, not Bernoullis, so the product has a closed form solution namely $q ( \mathbf { z } | \mathbf { y } _ { \mathcal { O } } ) = \mathcal { N } ( \mathbf { z } | \mu , \mathbf { C } )$ , where $\begin{array} { r } { \mathbf { C } ^ { - 1 } = \sum _ { k } \mathbf { C } _ { k } ^ { - 1 } } \end{array}$ and $\begin{array} { r } { \pmb { \mu } = \mathbf { C } ( \sum _ { k } \mathbf { C } _ { k } ^ { - 1 } \pmb { \mu } _ { k } ) } \end{array}$ , and the sum is over all the observed attributes. Intuitively, y imposes an increasing number of constraints on $\mathbf { z }$ as more of it is observed, as explained in Williams & Agakov (2002). In our setting, if we do not observe any attributes, the posterior reduces to the prior. As we observe more attributes, the posterior becomes narrower, since the (positive definite) precision matrices, $\mathbf { C } ^ { - 1 }$ add up, reflecting the increased specificity of the concept being specified, as illustrated in Figure 2 (middle) (see also Williams & Agakov (2002)). We always include the prior term, $p ( \mathbf { z } )$ , in the product, since without it, the posterior $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { \mathcal { O } } )$ may not be well-conditioned when we are missing attributes, as illustrated in Figure 2 (right). For more implementation-level details on the model architectures, see Appendix A.4. + +# 3 EVALUATION METRICS: THE 3C’S OF VISUAL IMAGINATION + +To evaluate the quality of a set of generated images, $S ( \mathbf { y } _ { \mathcal { O } } ) = \{ \mathbf { x } _ { s } \sim p ( \mathbf { x } | \mathbf { y } _ { \mathcal { O } } ) : s = 1 : S \}$ , we apply a multi-label classifier to each image, to convert it to a predicted attribute vector, $\hat { \mathbf { y } } ( \mathbf x )$ . This attribute classifier is trained on a large dataset of images and attributes, and is held constant across all methods that are being evaluated. It plays the role of a human observer. This is similar in spirit to generative adversarial networks (Goodfellow et al., 2014), that declare a generated image to be good enough if a binary classifier cannot distinguish it from a real image. (Both approaches avoid the problems mentioned in Theis et al. (2016) related to evaluating generative image models in terms of their likelihood.) However, the attribute classifier checks not only that the images look realistic, but also that they have the desired attributes. + +To quantify this, we define the correctness as the fraction of attributes for each generated image that match those specified in the concept’s description: correctness $( \bar { s } , \mathbf { y } \bar { \omega } ) \ =$ $\begin{array} { r } { \frac { 1 } { | \mathcal { S } | } \sum _ { \mathbf { x } \in \mathcal { S } } \overset { 1 } { \underset { | \mathcal { O } | } { \mid } } \sum _ { k \in \mathcal { O } } \mathbb { I } ( \hat { y } ( \mathbf { x } ) _ { k } = \overset { \cdot } { y } _ { k } ) } \end{array}$ . However, we also want to measure the diversity of values for the unspecified or missing attributes, $\mathcal { M } = \mathcal { A } \backslash \mathcal { O }$ . We do this by comparing $q _ { k }$ , the empirical distribution over values for attribute $k$ induced by the generated set $s$ , to $p _ { k }$ , the true distribution for this attribute induced by the training set. We measure the difference between these distributions using the Jensen-Shannon divergence, since it is symmetric and satisfies $0 \leq \mathrm { J S } ( p , q ) \leq 1$ . We then define the coverage as follows: $\begin{array} { r } { \mathbf { \bar { c o v e r a g e } } ( S , \mathbf { y } _ { \mathcal { O } } ) \mathbf { \bar { = } } \frac { 1 } { | \mathcal { M } | } \sum _ { k \in \mathcal { M } } ( 1 - \mathbf { J } \mathbf { S } ( p _ { k } ^ { - } , q _ { k } ) ) } \end{array}$ . If desired, we can combine correctness and coverage into a single number, by computing the JS divergence between $p _ { k }$ and $q _ { k }$ for all attributes, where, for observed attributes, $p _ { k }$ is a delta function and $q _ { k }$ is the empirical distribution (we call this JS-overall). This gives us a convenient way to pick hyperparameters. However, for analysis, we find it helpful to report correctness and coverage separately. + +Note that our metric is different from the inception score proposed in Salimans et al. (2016). That is defined as follows: inception $\underline { { \mathbf { \Pi } } } = \exp \left( \mathbb { E } _ { \hat { p } ( \mathbf { x } ) } \left[ \dot { \mathrm { K L } } ( p ( y | \mathbf { x } ) , \dot { p } ( y \dot { ) } ) \right] \right)$ , where $y$ is a class label. Expanding the term inside the exponential, we get + +$$ +\sum _ { \mathbf { x } } p ( \mathbf { x } ) \left[ \sum _ { y } p ( y | \mathbf { x } ) \log p ( y | \mathbf { x } ) \right] - \sum _ { \mathbf { x } } \sum _ { y } p ( \mathbf { x } , y ) \log p ( y ) = \mathbb { E } _ { \hat { p } ( \mathbf { x } ) } \left[ - H ( y | \mathbf { x } ) \right] + H ( y ) +$$ + +A high inception score means that the distribution $p ( y | \mathbf { x } )$ has low entropy, so the generated images match some class, but that the marginal $p ( y )$ has high entropy, so the images are diverse. However, the inception score was created to evaluate unconditional generative models of images, so it does not check if the generated images are consistent with the concept $\mathbf { y } _ { \mathcal { O } }$ , and the degree of diversity does not vary in response to the level of abstraction of the concept. + +Finally, we can assess how well the model understands compositionality, by checking correctness of its generated images in response to test concepts $\mathbf { y } _ { \mathcal { O } }$ that differ in at least one attribute from the training concepts. We call this a compositional split of the data. This is much harder than a standard iid split, since we are asking the model to predict the effects of novel combinations of attributes, which it has not seen before (and which might actually be impossible). Note that abstraction is different from compositionality – in abstraction we are asking the model to predict the effects of dropping certain attributes instead of predicting novel combinations of attributes. + +# 4 RELATED WORK + +In this section, we briefly mention some of the most closely related prior work. + +Conditional models. Many conditional generative image models of the form $p ( \mathbf { y } \vert \mathbf { x } )$ have been proposed recently, where y can be a class label (e.g., (Radford et al., 2016)), a vector of attributes (e.g., (Yan et al., 2016)), a sentence (e.g., (Reed et al., 2016)), another image (e.g., (Isola et al., 2017)), etc. Such models are usually based on VAEs or GANs. However, we are more interested in learning a shared latent space from either descriptions y or images x, which means we need to use a joint, symmetric, model. + +Joint models. Several papers use the same joint VAE model as us, but they differ in how it is trained. In particular, the BiVCCA objective of Wang et al. (2016b) has the form ${ \mathcal { L } } ( \theta , \phi ) =$ + +$\mathbb { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ J ( \mathbf { x } , \mathbf { y } , \pmb { \theta } , \phi ) \right]$ , where + +$$ +\begin{array} { r } { J ( \mathbf { x } , \mathbf { y } , \pmb { \theta } , \phi ) = \mu \left( E _ { q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) } [ \log p \pmb { \theta } _ { x } ( \mathbf { x } | \mathbf { z } ) + \lambda \log p \pmb { \theta } _ { y } ( \mathbf { y } | \mathbf { z } ) ] - \mathrm { K L } ( q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) , p \pmb { \theta } ( \mathbf { z } ) ) \right) } \\ { + ( 1 - \mu ) \left( E _ { q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) } [ \log p \pmb { \theta } _ { x } ( \mathbf { x } | \mathbf { z } ) + \lambda \log p \pmb { \theta } _ { y } ( \mathbf { y } | \mathbf { z } ) ] - \mathrm { K L } ( q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) , p \pmb { \theta } ( \mathbf { z } ) ) \right) } \end{array} +$$ + +This method results in the model generating the mean image corresponding to each concept, due to the $E _ { q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) } \log p _ { \theta } ( \mathbf { x } , \mathbf { y } | \mathbf { z } )$ term, which requires that $\mathbf { z }$ ’s sampled from $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { n } )$ be good at generating all the different ${ \bf x } _ { n }$ ’s which co-occur with ${ \bf y } _ { n }$ . We show this empirically in Section 5. This problem can be partially compensated for by increasing $\mu$ , but that reduces the $\operatorname { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { y } ) , p _ { \theta } ( \mathbf { z } ) )$ penalty, which is required to ensure $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } )$ is a broad distribution with good coverage of the concept. + +The JMVAE objective of Suzuki et al. (2017) has the form $\mathcal { L } ( \pmb { \theta } , \phi ) = \mathbb { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ J ( \mathbf { x } , \mathbf { y } , \pmb { \theta } , \phi ) \right]$ , where + +$$ +I ( \mathbf { x } , \mathbf { y } , \boldsymbol { \theta } , \boldsymbol { \phi } ) = \mathrm { e l b o } _ { 1 , \boldsymbol { \lambda } , 1 } ( \mathbf { x } , \mathbf { y } , \boldsymbol { \theta } , \boldsymbol { \phi } ) - \alpha \left[ \mathrm { K L } ( q _ { \boldsymbol { \phi } } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) , q _ { \boldsymbol { \phi } _ { y } } ( \mathbf { z } | \mathbf { y } ) ) + \mathrm { K L } ( q _ { \boldsymbol { \phi } } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) , q _ { \boldsymbol { \phi } _ { x } } ( \mathbf { z } | \mathbf { x } ) ) \right] +$$ + +At first glance, forcing $q _ { \phi } ( \mathbf { z } | \mathbf { y } )$ to be close to $q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } )$ seems undesirable, since the latter will typically be close to a delta function, since there is little posterior uncertainty in $\mathbf { z }$ once we see the image x. However, in Appendix A.1, we use results from Hoffman $\&$ Johnson (2016) to show that $\mathbb { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ \mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) , q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) ) \right]$ can be written in terms of $\operatorname { K L } ( q _ { \phi } ^ { \mathrm { a v g } } ( \mathbf { z } | \mathbf { y } ) , q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) )$ , where $q _ { \phi } ^ { \mathrm { a v g } } ( \mathbf { z } | \mathbf { y } ) = \mathbf { \bar { \mathbb { E } } } _ { \hat { p } ( \mathbf { x } | \mathbf { y } ) } \left[ q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) \right]$ is the aggregated posterior over $\mathbf { z }$ induced by all images $\mathbf { x }$ which are associated with description $\mathbf { y }$ . This ensures that $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } )$ will cover the embeddings of all the images associated with concept $\mathbf { y }$ . However, since there is no $\mathrm { K L } ( q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) , p _ { \pmb { \theta } } ( \mathbf { z } ) )$ term, the diversity of the samples is slightly reduced for novel concepts compared to TELBO, as we show empirically in Section 5. On the flip side, the benefit of using the aggregated posterior to fit the $q ( \mathbf { z } | \mathbf { y } )$ inference network is that one can expect sharper images, as this ensures we will sample $\mathbf { z } \sim q ( \mathbf { z } | \mathbf { y } )$ which have been seen by the image decoder $p _ { \pmb { \theta } } ( \mathbf { x } | \mathbf { z } )$ during joint training. If the aggregated posterior does not exactly match the prior (which is known to happen in VAE-type models, see Hoffman & Johnson (2016)) then regularizing with respect to the prior (as TELBO does) can generate samples in parts of space not seen by the image decoder, which can potentially lead to less “correct” samples. Again, our empirical findings in Section 5 confirm this tradeoff between correctness and coverage implicit in choices of TELBO vs. JMVAE. + +The SCAN method of Higgins et al. (2017b) first fits a standard $\beta$ -VAE model (Higgins et al., 2017a) on unlabeled images (or rather, features derived from images using a pre-trained denoising autoencoder) by maximizing $\mathcal { L } ( \pmb { \theta } _ { x } , \pmb { \phi } _ { x } ) = \mathbb { E } _ { \hat { p } ( \mathbf { x } ) }$ $[ \mathrm { e l b o } _ { 1 , \beta _ { x } } ( \mathbf { x } , \pmb { \theta } _ { x } , \phi _ { x } ) ]$ . They then fit a second VAE by maximizing $\mathcal { L } ( \pmb { \theta } _ { y } , \pmb { \phi } _ { y } ) = \mathbb { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ J ( \mathbf { x } , \mathbf { y } , \pmb { \theta } _ { y } , \phi _ { y } , \phi _ { x } ) \right]$ , where + +$$ +J ( \mathbf { x } , \mathbf { y } , \pmb { \theta } _ { y } , \phi _ { y } , \phi _ { x } ) = \mathrm { { e l b o } } _ { 1 , \beta _ { y } } ( \mathbf { y } , \pmb { \theta } _ { y } , \phi _ { y } ) - \alpha \mathrm { { K L } } ( q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) , q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) ) +$$ + +This is very similar to JMVAE, since $q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) \approx q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } )$ , when $\displaystyle ( \mathbf { x } , \mathbf { y } )$ is a matching pair of images and labels. An important difference, however, is that SCAN treats the attribute vectors $\mathbf { y }$ as atomic symbols; this has the advantage that there is no need to handle missing inputs, but the disadvantage that they cannot infer the meaning of unseen attribute combinations at test time, unless they are “taught” them by having them paired with images. Also, they rely on $\beta _ { x } > 1$ as a way to get compositionality, assuming that a disentangled latent space will suffice. However, in Appendix A.3, we show that unsupervised learning of the latent space given images alone can result in poor results when some of the attributes in the compositional concept hierarchy are non-visual, such as parity of an MNIST digit. Our approach always takes the labels into consideration when learning the latent space, permitting well-organized latent spaces even in the presence of non-visual concepts (c.f. the difference between PCA and LDA). + +Handling missing inputs. Conditional generative models of images, of the form $p ( \mathbf { x } | \mathbf { y } )$ , have problems with missing input attributes, as do inference networks $q ( \mathbf { z } | \mathbf { y } )$ for VAEs. Hoffman (2017) uses MCMC to fit a latent Gaussian model, which can in principle handle missing data; however, he initializes the Markov chain with the posterior mode computed by an inference network, which cannot easily handle missing inputs. One approach we can use, if we have a joint model, is to estimate or impute the missing values, as follows: $\hat { \mathbf { y } } = \arg \operatorname* { m a x } _ { \mathbf { y } _ { \mathcal { M } } } p ( \mathbf { y } _ { \mathcal { M } } | \mathbf { y } _ { \mathcal { O } } )$ , where $p ( \mathbf { y } _ { \mathcal { M } } , \mathbf { y } _ { \mathcal { O } } )$ models dependencies between attributes. We can then sample images using $p ( \mathbf { x } | \hat { \mathbf { y } } )$ . This approach was used in Yan et al. (2016) to handle the case where some of the pixels being passed into an inference network were not observed. However, conditioning on an imputed value will give different results from not conditioning on the missing inputs; only the latter will increase the posterior uncertainty in order to correctly represent less precise concepts with broader support. + +Gaussian embeddings. There are many papers that embed images and text into points in a vector space. However, we want to represent concepts of different levels of abstraction, and therefore want to map images and text to regions of latent space. There are some prior works that use Gaussian embeddings for words (Vilnis & McCallum, 2015; Athiwaratkun & Wilson, 2017), sometimes in conjunction with images (Mukherjee & Hospedales, 2016; Ren et al., 2016). Our method differs from these approaches in several ways. First, we maximize the likelihood of $\displaystyle ( \mathbf { x } , \mathbf { y } )$ pairs, whereas the above methods learn a Gaussian embedding using a contrastive loss. Second, our PoE formulation ensures that the covariance of the posterior $q ( \mathbf { z } | \mathbf { y } _ { \mathcal { O } } )$ is adaptive to the data that we condition on. In particular, it becomes narrower as we observe more attributes (because the precision matrices sum up), which is a property not shared by other embedding methods. + +Abstraction and compositionality. Young et al. (2014) represent the extension of a concept (described by a noun phrase) in terms of a set of images whose captions match the phrase. By contrast, we use a parametric probability distribution in a latent space that can generate new images. Vendrov et al. (2016) use order embeddings, where they explicitly learn subsumption-like relationships by learning a space that respects a partial order. In contrast, we reason about generality of concepts via the uncertainty induced by their latent representation. There has been some work on compositionality in the language/vision literature (see e.g., Atzmon et al. (2016); Johnson et al. (2017); Agrawal et al. (2017)), but none of these papers use generative models, which is arguably a much more stringent test of whether a model has truly “understood” the meaning of the components which are being composed. + +# 5 EXPERIMENTAL RESULTS + +In this section, we fit the JVAE model to two different datasets (MNIST-A and CelebA), using the TELBO objective, as well as BiVCCA and JMVAE. We measure the quality of the resulting model using the 3 C’s, and show that our method of handling missing data behaves in a qualitatively reasonable way. + +# 5.1 MNIST-A + +Dataset. In this section, we report results on the MNIST-A dataset. This is created by modifying the original MNIST dataset as follows. We first create a compositional concept hierarchy using 4 discrete attributes, corresponding to class label (10 values), location (4 values), orientation (3 values), and size (2 values). Thus there are $1 0 { \times } 2 { \times } 3 { \times } 4 = 2 4 0$ unique concepts in total. We then sample $\sim 2 9 0$ example images of each concept, and create both an iid and compositional split of the data. See Appendix A.2 for details. + +Models and algorithms. We train the JVAE model on this dataset using TELBO, BiVCCA and JMVAE objectives. We use Adam (Kingma & Ba, 2015) for optimization, with a learning rate of 0.0001, and a minibatch size of 64. We train all models for 250,000 steps (we generally found that the models do not tend to overfit in our experiments). Our models typically take around a day to train on NVIDIA Titan X GPUs. For the image models, $p ( \mathbf { x } | \mathbf { z } )$ and $q ( \mathbf { z } | \mathbf { x } )$ , we use the DCGAN architecture from Radford et al. (2016). Our generated images are of size $6 4 \times 6 4$ , as in Radford et al. (2016). For the attribute models, $p ( y _ { k } | \mathbf { z } )$ and $q ( \mathbf { z } | y _ { k } )$ , we use MLPs. For the joint inference network, $q ( \mathbf { z } | \mathbf { x } , \mathbf { y } )$ , we use a CNN combined with an MLP. We use $d = 1 0$ latent dimensions for all models. We choose the hyperparameters for each method so as to maximize JS-overall, which is an overall measure of correctness and coverage (see Section 3) on a validation set of attribute queries. See Appendix A.4 for further details on the model architectures. + +Evaluation. To measure correctness and coverage, we first train the observation classifier on the full iid dataset, where it gets to an accuracy of $9 1 . 1 8 \%$ for class label, $9 0 . 5 6 \%$ for scale, $9 2 . 2 3 \%$ for orientation, and $100 \%$ for location. Consequently, it is a reliable way to assess the quality of samples from various generative models (see Appendix A.5 for details). We then compute correctness and coverage on the iid dataset, and coverage on the comp dataset. + +![](images/216614ff4d58de7325957c620c11d08b9ac4d0b78fb017fed0bf9166d2831af1.jpg) +Query: 0, small, clockwise, top-right +Figure 3: Samples from attribute vectors seen at training time, generated by the 3 different models. We plot the posterior mean of each pixel, $\mathbb { E } \left[ \mathbf { x } | \mathbf { z } _ { s } \right]$ , where $\mathbf { z } _ { s } \sim \hat { q } _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } )$ . The caption at the top of each little image is the predicted attribute values. The border of the generated image is red if any of the attributes are predicted incorrectly. (The observation classifier is fed sampled images, not the mean image that we are showing here.) + +Familiar concrete concepts. We start by assessing the quality of the models in the simplest setting, which is where the test concepts are fully specified (i.e., all attributes are known), and the concepts have been seen before in the training set (i.e., we are using the iid split). Figure 4a shows the correctness scores for the three methods. (Since the test concepts are fully grounded, coverage is not well defined, since there are no missing attributes.) We see that TELBO has a correctness of $8 2 . 0 8 \%$ , which is close to that of JMVAE $( 8 5 . 1 5 \% )$ ; both methods significantly outperform BiVCCA $( 6 7 . 3 8 \% )$ . To gain more insight, Figure 3 shows some samples from each of these methods for a leaf concept chosen at random. We see that the images generated by BiVCCA are very blurry, for reasons we discussed in Section 4. Note that these blurry images are correctly detected by the attribute classifier.3 We also see that the JMVAE samples all look good (in this example). Most of the samples from TELBO are also good, although there is one error (correctly detected by the attribute classifier). + +
Method#AttributesCoverage (%)Correctness (%)
iid split
TELBO482.08±0.56
JMVAE85.15 ±0.26
BiVCCA67.38 ±0.69
TELBO391.14 ± 0.5381.63 ± 0.38
JMVAE88.52 ± 0.3782.00 ±0.37
BiVCCA85.28 ±0.6870.68 ± 0.87
TELBO290.32 ± 0.5782.03 ± 1.37
JMVAE87.89 ±0.6981.02 ± 1.05
BiVCCA85.09 ±0.7672.33 ± 2.31
TELBO190.94 ±0.1983.67 ± 1.70
JMVAE88.70 ±0.3581.58 ± 1.78
BiVCCA85.53 ± 0.2768.36 ± 2.21
Compositional split
TELBO475.61 ± 1.43
JMVAE76.86 ± 1.30
BiVCCA68.58 ± 1.02
+ +![](images/67115530c872ea1da2927de9b0adb176a254c84c012a930b88a6d53d578942b5.jpg) +(b) Mean images generated by TELBO and JMVAE in response to queries at different levels of abstraction, starting from abstract (top) to refined (bottom). + +(a) Evaluation of different approaches on the test set. Higher numbers are better. We report standard deviation across 5 splits of the test set. + +Figure 4: (a) We show quantitaive results on the 3C’s on MNIST-A. (b) Qualitative results on MNIST-A for various queries. For refined/fully specified queries, we can see that both TELBO and JMVAE produce good correctness, i.e., the images produced follow constraints placed by the specified attributes. When the attribute ‘orientation’ is unspecified, we see that TELBO produces upright and counter clockwise digits, while JMVAE produces clockwise and upright digits. Finally, when we leave the digit unspecified (top), we see that TELBO appears to generate a more diverse set of digits (9, 3, 8, 6) while JMVAE produces 0 and 3. + +Novel abstract concepts. Next we assess the quality of the models when the test concepts are abstract, i.e., one or more attributes are not specified. (Note that the model was never trained on such abstract concepts.) Figure 4a shows that the correctness scores for JMVAE seems to drop somewhat (from about $85 \%$ to about $8 1 . 5 \%$ ), although it remains steady for TELBO and BiVCCA. We also see that the coverage of TELBO is higher than the other methods, due to the use of the $\mathrm { K L } ( q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) , p _ { \pmb { \theta } } ( \mathbf { z } ) )$ regularizer, as we discussed in Section 4. Figure 4b illustrates how the methods respond to concepts of different levels of abstraction. The samples from the TELBO seem to be more diverse, which is consistent with the numbers in Figure 4a. + +Compositionally novel concrete concepts. Finally we assess the quality of the models when the test concepts are fully specified, but have not been seen before (i.e., we are using the comp split). Figure 4a shows some quantitative results. We see that the correctness for TELBO and JMVAE has dropped from about $82 \%$ to about $7 5 \%$ , since this task is much harder, and requires “strong generalization”. However, as before, we see that both TELBO and JMVAE outperform BiVCCA, which has a correctness of about $69 \%$ . See Appendix A.7 qualitative results and more details. + +# 5.2 CELEBA + +In this section, we report results on the CelebA dataset (Liu et al., 2015). In particular, we use the version that was used in Perarnau et al. (2016), which selects 18 visually distinctive attributes, and generate images of size $6 4 \times 6 4$ ; see Appendix A.8 for more details on the CelebA dataset and Appendix A.4 for details of the model architectures. Figure 5 shows some sample qualitative results. On the top left, we show some images which were generated by the three methods given the concept shown in the left column. TELBO and JMVAE generate realistic and diverse images. That is, the generated images are generally of males, with mouth slightly open and smiling attributes present in the images. On the other hand, BiVCCA just generates the mean image. On the bottom left, we show what happens when we drop some attributes, thus specifying more abstract concepts. We see that when we drop the gender, we get a mixture of both male and female images for both TELBO and JMVAE. Going further, when we drop the “smiling” attribute, we see that the samples now comprise of people who are smiling as well as not smiling, and we see a mixture of genders in the samples. Further, while we see a greater diversity in the samples, we also notice a slight drop in image quality (presumably because none of the approaches has seen supervision with just ‘abstract’ concepts). See Appendix A.9 for more qualitative examples on CelebA. On the top right, we show some examples of visual imagination, where we ask the models to generate images from the concept “bald female”, which does not occur in the training set.4 (We omit the results from BiVCCA, which are uniformly poor.) We see that both TELBO and JMVAE can sometimes do a fairly reasonable job (although these are admittedly cherry picked results). Finally, the bottom right illustrates an interesting bias in the dataset: if we ask the model to generate images where we do not specify the value of the eyeglasses attribute, nearly all of the samples fail to included glasses, since the prior probability of this attribute is rare (about $6 \%$ ). + +# 6 CONCEPT NAMING WITH IMAGINATION MODELS + +In this section, we demonstrate initial results which show that our imagination models can be used for concept naming, where the task is to assign a label to a set of images illustrating the concept depicted by the images. A similar problem has been studied in previous work such as Tenenbaum (1999) and Jia et al. (2013). Tenenbaum (1999) studies a set naming problem with integers (instead of images), and show that construct a likelihood function given a hypothesis set that can capture notions of the minimal/smallest hypothesis that explains the observed samples in the set. Jia et al. (2013) extend this approach to concept-naming on images, incorporating perceptual uncertainty (in recognizing the contents of an image) using a confusion matrix weighted likelihood term. While this approach first extracts labels for each image and then performs concept naming, here we test how well our generative model itself is able to generalize to concept naming without ever performing explicit classification on the images. + +![](images/b6b6e00f19c0762479d47d8ed6c0293c054705b7c21da5444678f934722760b6.jpg) +Figure 5: Sample CelebA results. Left: we show the attributes specified to be present or absent when generating images. Middle: we show 10 samples each generated from TELBO, JMVAE and BiVCCA. We see that TELBO and JMVAE genreate better samples than BiVCCA which collapses to the mean. Middle, bottom: We show five samples from TELBO and JMVAE in response to queries with unspecified attributes, and see that both approaches generate a mix in the samples, generalizing meaningfully across unspecified attributes. + +In more detail, the problem setup in concept naming is as follows: we are given as input a set $\mathcal { X }$ of images, each of which corresponds to a concept in the compositional abstraction hierarchy Figure 1. The task is to assign a label $\mathbf { y } \in \mathcal { V }$ to the set of images. One of the key challenges in concept learning is to understand “how far” to generalize in the concept hierarchy given a limited number of positive examples (Tenenbaum, 1999). That is, given a small set of images with 7 in the top-left corner and bottom-right corner, one must infer that the concept is “7” as opposed to “7, top-left”. In other words, we wish to find the least common ancestor (in the concept hierarchy) corresponding to all the images in the set, given any number of images in the set, so that we can be consistent with the set. We consider two heuristic solutions to this problem: + +1. Concept-NB: In this approach we compute arg maxy $p ( \mathbf { y } | \boldsymbol { \mathcal { X } } )$ , where $p ( \mathbf { y } | \boldsymbol { \mathcal { X } } )$ is computed using the naive bayes assumption: + +$$ +p ( \mathbf { y } | \mathcal { X } ) \propto p ( \mathbf { y } ) \Pi _ { \mathbf { x } _ { n } \in \mathcal { X } } p ( \mathbf { x } _ { n } | \mathbf { y } ) = p ( \mathbf { y } ) \Pi _ { \mathbf { x } _ { n } \in \mathcal { X } } \int d \mathbf { z } _ { n } p ( \mathbf { x } _ { n } | \mathbf { z } _ { n } ) q ( \mathbf { z } _ { n } | \mathbf { y } ) +$$ + +where $p ( y )$ is chosen to be uniform across all concepts, and the integrals are approximated using Monte Carlo. + +2. Concept-Latent: In this approach, instead of working in the observed space, we work in the latent space. That is, we pick a $\mathrm { r g m i n } _ { \mathbf { y } } \mathrm { K L } ( q ( \mathbf { z } | \mathcal { X } ) | \bar { q ( \mathbf { z } | \mathbf { y } ) } )$ , where $q ( \mathbf { z } | \mathcal { X } )$ is approximated using $\bar { \sum _ { \mathbf { x } \in \mathcal { X } } q ( \mathbf { z } | \mathbf { x } ) }$ , which is a mixture of gaussians. The KL divergence can be computed analytically by considering the first two moments of the gaussian mixture5. + +# 6.1 EXPERIMENTAL SETUP + +We use the MNIST-A dataset for the concept naming studies. We consider the fully specified attribute labels in the MNIST-A hierarchy, and consider differrent patterns of missingness (corresponding to different nodes in the abstraction hirearchy) by dropping attributes. Specifically, we ignore the case where no attribute is specified, and consider a uniform distribution over the rest of the $\mathsf { \bar { ( 2 ^ { 4 } - 1 = 1 5 ) } }$ ) patterns of missingness. Now, for each fully specified attribute pattern in the iid split of MNIST-A, we sample four missingness patterns and repeat across all fully specified attributes to form a bank of 960 candidate names that a model must choose. We randomly select three subsets of 100 candidate names (and the corresponding images) to form the query set for concept naming, namely tuples of $( \mathbf { y } , { \mathcal { X } } )$ . Specifically, given all the images in the eval set for a concept $\mathbf { y }$ , we form $\mathcal { X }$ using a randomly sampled subset of 5 images. We report the accuracy metric, measuring how often the selected concept for a set $\mathcal { X }$ matches the ground truth concept, across three different splits of 100 datapoints. + +Table 1: Accuracy of Imagination models on Concept Naming. Higher is better. + +
ApproachConcept-Latent (%)Concept-NB (%)
TELBO35.66 ± 2.0517.66 ± 1.70
JMVAE54.66 ± 4.9213.33 ± 2.05
BiVCCA28.00 ± 4.5418.00 ± 1.40
Random0.28±0.000.28±0.00
Most Frequent6.33 ± 1.886.33 ± 1.88
+ +![](images/d8dbbd7899942a27afafc0400945fd04332ca9dcd37f0361b8f6a7b42039a005.jpg) +Figure 6: A qualitative illustration of some of the examples from concept naming models. Top-left: an example of a sample that is correctly named by a Concept-NB model. However, the Concept-NB model is not that strong and often gets simple concepts such as digits incorrect, making mistakes between 6 and 0, for example (bottom-left). This is likely because the only way in which the Concept-NB approach reasons about the set is not via a "meaningful" low dimensional latent variable but via a sampling distribution on a high dimensional space of images. The Concept-Latent model is able to do better on the same set of images, and classify the set as the concept “6”. Finally, we show a failure case of the model where it incorrectly classifies the digits as being large (there is a small digit in the set), and ignores the fact that all of the digits are in the top-left. + +# 6.2 RESULTS + +We evaluate the best versions of TELBO, JMVAE, and BiVCCA on the iid split of MNIST-A for concept naming (Table 1). In general, we find that Concept-NB approaches perform significantly worse than Concept-Latent approaches. For example, the best Concept-NB approach (using TELBO/BiVCCA objective) gets to an accuracy of around $1 8 \%$ , while Concept-Latent using JMVAE gets to $5 4 . 6 6 \pm 4 . 9 2 \%$ . In general, these numbers are better than a random chance baseline which would get to $0 . 2 8 \%$ (picking one of 348 effective options, after collating the 960 candidate names based on missingness patterns), while picking the most frequent (ground truth) fully-specified y depicted across an image set gets to $6 . 3 \bar { 3 } \pm 1 . \bar { 8 } 8 \%$ . Figure 6 shows some qualitative examples from Concept-NB as well as Concept-Latent models for concept / set classification. We observe that the Concept-Latent models are much more powerful than using Concept-NB in terms of naming the concept based on few positive examples from the support set. + +# 7 CONCLUSIONS AND FUTURE WORK + +We have shown how to create generative models which can “imagine” compositionally novel concrete and abstract visual concepts. In the future we would like to explore richer forms of description, beyond attribute vectors, such as natural language text, as well as compositional descriptions of scenes, which will require dealing with a variable number of objects. + +# ACKNOWLEDGMENTS + +We would like to thank Hernan Moraldo for his help in writing the JVAE library, Alex Alemi for valuable insights on TELBO and JMVAE, and Sergio Guadarrama and Harsh Satija for numerous discussions around the project. 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In ECCV, 2016. + +Peter Young, Alice Lai, Micah Hodosh, and Julia Hockenmaier. From image descriptions to visual denotations: New similarity metrics for semantic inference over event descriptions. Trans. Assoc. Comp. Ling., pp. 67–78, Feb 2014. + +# A APPENDIX + +A.1 ANALYSIS OF JMVAE OBJECTIVE + +The JMVAE objective of (Suzuki et al., 2017) has the form + +$$ +J ( \mathbf { x } , \mathbf { y } , \theta , \phi ) = \operatorname { e l b o } ( \mathbf { x } , \mathbf { y } , \theta , \phi ) - \alpha \left[ \mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) , q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) ) + \mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) , q _ { \phi _ { x } } ( \mathbf { z } | \mathbf { x } ) ) \right] +$$ + +Let us focus on the $\mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) | q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) )$ term. Let $\mathcal { V }$ be the set of unique labels (attribute vectors) in the training set, $\mathcal { X } _ { i }$ be the indices of the images associated with label $\mathbf { y } _ { i }$ , and let $N _ { i } = | \mathcal { X } _ { i } |$ be the size of that set. Then we can write + +$$ +\mathbb { E } _ { \hat { p } ( \mathbf { x } , \mathbf { y } ) } \left[ \mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } , \mathbf { y } ) | q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } ) ) \right] = \frac { 1 } { | \mathcal { y } | } \sum _ { i \in \mathcal { Y } } \frac { 1 } { N _ { i } } \sum _ { n \in \mathbf { X } _ { i } } \mathrm { K L } ( q _ { \phi } ( \mathbf { z } | \mathbf { x } _ { n } , \mathbf { y } _ { i } ) , q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } ) ) +$$ + +As explained in (Hoffman & Johnson, 2016), we can rewrite this by treating the index $n \in$ $\{ 1 , \cdots , N _ { i } \}$ as a random variable, with prior $q ( n | \mathbf { y } _ { i } ) = 1 / N _ { i }$ . Also, let us define the likelihood $q ( \mathbf { z } | n , \mathbf { y } _ { i } ) \stackrel { - } { = } q _ { \phi } ( \mathbf { z } | \mathbf { x } _ { n } , \mathbf { y } _ { i } )$ . Using this notation, we can show that the above average KL becomes + +$$ +\frac { 1 } { | \mathcal { D } | } \sum _ { i \in \mathcal { Y } } \Big \{ \mathrm { K L } ( q _ { \phi } ^ { \mathrm { a v g } } ( \mathbf { z } | \mathbf { y } _ { i } ) | q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } ) ) + \log N _ { i } - \mathbb { E } _ { q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } ) } \left[ \mathbb { H } ( q ( n | \mathbf { z } , \mathbf { y } _ { i } ) ) \right] \Big \} +$$ + +where + +$$ +q _ { \phi } ^ { \mathrm { a v g } } ( \mathbf { z } | \mathbf { y } _ { i } ) = \frac { 1 } { N _ { i } } \sum _ { n \in \mathcal { X } _ { i } } q _ { \phi } ( \mathbf { z } | \mathbf { x } _ { n } , \mathbf { y } _ { i } ) +$$ + +is the average of the posteriors for that concept, and $q ( n | \mathbf { z } , \mathbf { y } _ { i } )$ is the posterior over the indices for all the possible examples from the set $\mathcal { X } _ { i }$ , given that the latent code is $\mathbf { z }$ and the description is $\mathbf { y } _ { i }$ . + +The $\operatorname { K L } ( q _ { \phi } ^ { \mathrm { a v g } } ( \mathbf { z } | \mathbf { y } _ { i } ) | q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } ) )$ term in Equation (4) tells us that JMVAE encourages the inference network for descriptions, $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } )$ , to be close to the average of the posteriors induced by each of the images ${ \bf x } _ { n }$ associated with $\mathbf { y } _ { i }$ . Since each $q _ { \phi } ( \mathbf { z } | \mathbf { x } _ { n } , \mathbf { y } _ { i } )$ is close to a delta function (since there is little posterior uncertainty when conditioning on an image), we are essentially requiring that $q _ { \phi } ( \mathbf { z } | \mathbf { y } _ { i } )$ cover the embeddings of each of these images. + +# A.2 DETAILS ON THE MNIST-A DATASET + +We created the MNIST-A dataset as follows. Given an image in the original MNIST dataset, we first sample a discrete scale label (big or small), an orientation label (clockwise, upright, and anticlockwise), and a location label (top-left, top-right, bottom-left, bottom-right). + +Next, we converted this vector of discrete attributes into a vector of continuous transformation parameters, using the procedure described below: + +• Scale: For big, we sample scale values from a Gaussian centered at 0.9 with a standard deviation of 0.1, while for small we sample from a Gaussian centered at 0.6 with a standard deviation of 0.1. In all cases, we reject and draw a sample again if we get values outside the range [0.4, 1.0], to avoid artifacts from upsampling or problems with illegible (small) digits. Orientation: For the clockwise label, we sample the amount of rotation to apply for a digit from a Gaussian centered at $+ 4 5$ degrees, with a standard deviation of 10 degrees. For anti-clockwise, we use a Gaussian at -45 degrees, with a standard deviation of 10 degrees. For upright, we set the rotation to be 0 degrees always. Location: For location, we place Gaussians at the centers of the four quadrants in the image, and then apply an offset of image_size/16 to shift the centers a bit towards the corresponding corners. We then use a standard deviation of image_size/16 and sample locations for centers of the digits. We reject and draw the sample again if we find that the location for the center would place the extremities of the digit outside of the canvas. + +Finally, we generate the image as follows. We first take an empty black canvas of size $6 4 \times 6 4$ , rotate the original $2 8 \times 2 8$ MNIST image, and then scale and translate the image and paste it on the canvas. (We use bicubic interpolation for scaling and resizing the images.) Finally, we use the method of (Salakhutdinov & Murray, 2008) to binarize the images. See Figure 7 for example images generated in this way. + +We repeat the above process of sampling labels, and applying corresponding transformations, to generate images 10 times for each image in the original MNIST dataset. Each trial samples labels from a uniform categorical distribution over the sample space for the corresponding attribute. Thus, we get a new MNIST-A dataset with 700,000 images from the original MNIST dataset of 70,000 images. We split the images into a train, val and test set of $85 \%$ , $5 \%$ , and $10 \%$ of the data respectively to create the IID split. To create the compositional split, we split the $1 0 { \times } 2 { \times } 3 { \times } 4 = 2 4 0$ possible label combinations by the sample train/val/test split, giving us splits of the dataset with non-overlapping label combinations. + +![](images/33f8b05ab8fce936e7f3835a7b292e98cde56931f9c9e1a8753bb9a2c64cf1a8.jpg) +Figure 7: Example binary images from our MNIST-A dataset. + +# A.3 $\beta$ -VAE vs.JOINT VAE + +![](images/0af5e0e3d9ed36265cfe96b0d79354e35c4e4ec83bd117cfc12e8cf76c61b051.jpg) +Figure 8: Visualization of the benefit of semantic annotations for learning a good latent space. Each small digit is a single sample generated from $p ( x | z )$ from the corresponding point $z$ in latent space. (a) $\beta$ -VAE fit to images without annotations. The color of a point $z$ is inferred from looking at the attributes of the training image that maps to this point of space using $q ( z | x )$ . Note that the red region (corresponding to the concept of large and even digits) is almost non existent. (b) Joint-VAE fit to images with annotations. The color of a point $z$ is inferred from $p ( y | z )$ . + +$\beta$ -VAE Higgins et al. (2017a) is an approach that aims to learn disentangled latent spaces. It does this by modifying the ELBO objective, so that it scales the $\mathrm { K L } ( q ( \mathbf { z } | \mathbf { x } ) , p ( \mathbf { z } ) )$ term by a factor $\beta > 1$ . This gives rise to disentangled spaces since the prior $p ( \mathbf { z } ) = \mathcal { N } ( \mathbf { z } | \mathbf { 0 } , \mathbf { I } )$ is factorized (see (Achille & Soatto, 2017) for details). However, to learn latent spaces that correspond to high level concepts, this is not sufficient: we need to use labeled data as well. + +To illustrate this, we set up an experiment where we learn a 2d latent space for standard MNIST digit images, but where we replace the label with two binary attributes: parity (odd vs.even) and magnitude (value $< 5$ or $> = 5$ ). We call this dataset MNIST-2bit. + +In Figure 8(a), we show the results of fitting a 2d $\beta$ -VAE model (Higgins et al., 2017a) to the images in MNIST-2bit, ignoring the attributes. We perform a hyperparameter sweep over $\beta$ , and pick the one that gives the best looking latent space (this corresponds to a value of $\beta = 1 0$ ). At each point $z$ in the latent 2d space, we show a single image sampled from $p ( x | z )$ . To derive the colors for each point in latent space, we proceed as follows: we embed each training image $x$ (with label $y ( x ) )$ into latent space, by computing $\hat { z } ( x ) = E _ { q ( z | x ) } [ z ]$ . We then associate label $y ( x )$ with this point in space. To derive the label for an arbitrary point $z$ , we lookup the closest embedded training image (using $\ell _ { 2 }$ distance in $z$ space), and use its corresponding label. We see that the latent space is useful for autoencoding (since the generated images look good), but it does not capture the relevant semantic properties of parity and magnitude. In fact, we argue that there is no way of forcing the model to learn a latent space that captures such high level conceptual properties from images alone. + +In Figure 8(b), we show the results of fitting a joint VAE model to MNIST-2bit, by optimizing $\mathrm { e l b o } ( x , y )$ on images and attributes (i.e., we do not include the uni-modality $\operatorname { e l b o } ( x )$ and $\operatorname { e l b o } ( y )$ terms in this experiment.) Now the color codes are derived from $p ( y | z )$ rather than using nearest neighbor retrieval. We see that the latent space autoencodes well, and also captures the 4 relevant types of concepts. In particular, the regions are all convex and linearly seperable, which facilitates the learning of a good imagination function $q ( z | y )$ , interpolation, retrieval, and other latent-space tasks. + +A skeptic might complain that we have created an arbitrary partitioning of the data, that is unrelated to the appearance of the objects, and that learning such concepts is therefore “unnatural”. But consider an agent interacting with an environment by touching digits on a screen. Suppose the amount of reward they get depends on whether the digit that they touch is small or big, or odd or even. In such an environment, it would be very useful for the agent to structure its internal representation to capture the concepts of magnitude and parity, rather than in terms of low level visual similarity. (In fact, (Scarf et al., 2011) showed that pigeons can learn simple numerical concepts, such as magnitude, by rewarding them for doing exactly this!) Language can be considered as the realization of such concepts, which enables agents to share useful information about their common environments more easily. + +# A.4 DETAILS OF THE NEURAL NETWORK ARCHITECTURES + +As explained in the main paper, we fit the joint graphical model $p ( x , y , z ) = p ( z ) p ( x | z ) p ( y | z )$ with inference networks $q ( z | x , y )$ , $q ( z | x )$ , and $q ( z | y )$ . Thus, our overall model is made up of three encoders (denoted with $q$ ) and two decoders (denoted with $p$ ). Across all models we use the exponential linear unit (ELU) which is a leaky non-linearity often used to train VAEs. We explain the architectures in more detail below. + +# MNIST-A model architecture + +• Image decoder, $p ( x | z )$ : Our architecture for the image decoder exactly follows the standard DCGAN architecture from (Radford et al., 2016), where the input to the model is the latent state of the VAE. + +• Label decoder, $p ( y | z )$ : Our label decoder assumes a factorized output space $p ( y | z ) =$ $\textstyle \prod _ { k \in { \mathcal { A } } } p ( y _ { k } | z )$ , where $y _ { k }$ is each individual attribute. We parameterize each $p ( y _ { k } | z )$ with a two-layer MLP with 128 hidden units each. We apply a small amount of $\ell _ { 2 }$ regularization to the weight matrices. + +• Image and Label encoder, $q ( z | x , y )$ : Our architecture (Figure 9) for the image-label encoder first separately processes the images and the labels, and then concatenates them downstream in the network and then passes the concatenated features through a multi-layered perceptron. More specifically, we have convolutional layers which process image into 32, 64, 128, 16 feature maps with strides $1 , 2 , 2 , 2$ in the corresponding layers. We use batch normalization in the convolutional layers before applying the ELU non-linearity. On the label encoder side, we first encode the each attribute label into a 32d continuous vector and then pass each individual attribute vector through a 2-layered MLP with 512 hidden dimensions each. For example, for MNIST-A we have 4 attributes, which gives us 4 vectors of 512d. We then concatenate these vectors and pass it through a two layer MLP. Finally we concatenate this label feature with the image feature after the convolutional layers (after flattening the conv-features) and then pass the result through a 2 layer MLP to predict the mean $( \mu )$ and standard deviation $( \sigma )$ for the latent space gaussian. Following standard practice, we predict $\log \sigma$ for the standard deviation in order to get values which are positive. + +# µ + +![](images/3c8666b4b928e365d467fb0e5f9ee430477aaa538630478bba8cd6275380d78a.jpg) +Figure 9: Architecture for the $q ( z | x , y )$ network in our JVAE models for MNIST-A. Images are ( $6 4 \times 6 4 \times 1 )$ , class has 10 possible values, scale has 2 possible values, orientation has 3 possible values, and location has 4 possible values. + +• Image encoder, $q ( z | x )$ : The image encoder (Figure 10a) uses the same architecture to process the image as the image feature extractor in $q ( z | x , y )$ network described above. After the conv-features, we pass the result through a 3-layer MLP to get the latent state mean and standard deviation vectors following the procedure described above. + +• Label encoder, $q ( z | y )$ : The label encoder (Figure 10b) part of the architecture uses the same design choices to process the labels as the label encoder part in the $q ( z | x , y )$ network. After obtaining the concatenated label feature vectors, we pass the result through a 4-layered MLP with 512 hidden dimensions each and then finally obtain the mean $( \mu )$ and $\log \sigma$ values for each dimension in the latent state of the VAE. + +MNIST-A Observation Classifier Model We next describe the architecuture of the observation classifier we use for evaluating the 3C’s on the MNIST-A dataset. The observation classifier is a convolutional neural network, with the first convolutional layer with filters of size $5 \times 5$ , and 32 channels, followed by a $2 \times 2$ pooling layer applied with a stride of 2. This is followed by another convolutional layer with $5 \times 5$ filter size and 64 output channels. This is followed by another $2 \times 2$ pooling layer of stride 2. After this, the network has four heads (corresponding to each attribute), each of which is an MLP with a single hidden layer (of size 1024), with dropout applied to the activations. The final layer of the MLP outputs the logits for classifying each attribute into the corresponding categorical labels associated with it. We train this model from scratch on the MNIST-A dataset using stochastic gradient descent, batch size of 64 and a learning rate of $1 0 ^ { - 4 }$ . + +CelebA model architecture Our design choices for CelebA closely mirror the models we built for MNIST-A. One primary difference is that we use a latent dimensionality of 18 in our CelebA experiments which matches the number of attributes we model. Meanwhile, the architectures of the image encoder, image decoder (i.e.DCGAN), are exactly identical to what is described above for MNIST-A execept that encoders take as input a 3-channel RGB image, while decoders produce a + +![](images/9e12d7fa6e49bc69072418dfb93ff708face4629172583c460b31e4c20242522.jpg) +Figure 10: Archtectures for the single input inference networks for MNIST-A. + +3-channel output. We replace the Bernoulli likelihood with Quantized Normal likelihood (which is basically gaussian likelihood with uniform noise). + +In terms of the label encoder $q ( z | y )$ , we follow Figure 10b quite closely, except that we get as input 18 categorical (embedded) class labels as input, and we process the labels through a single hidden layer before concatenation and two hidden layers post concatenation (as opposed to two and four used in Figure 10b). + +Finally, the joint encoder $q ( z | x , y )$ , is again based heavily on Figure 9 where we feed as input 18 labels as opposed to 4, process them through a single layer mlp of 512d, concatenate them, and then pass the result through a two hidden layer mlp of $5 1 2 \mathrm { d }$ . At this point we concatenate the result with the image feature through the image feature head in Figure 9. Finally, we process the feature through another 512d single hidden layer mlp to produce the $\mu , \sigma$ values. + +# A.5 OUTPUTS OF OBSERVATION CLASSIFIER ON GENERATED IMAGES + +Figure 11 shows some images sampled from our TELBO model trained on MNIST-A. It also shows the attributes that are predicted by the attribute classifier. We see that the classifier often produces reasonable results that we as humans would also agree with. Thus, it acts as a reasonable proxy for humans classifying the labels for the generated images. + +# A.6 HYPERPARAMTER CHOICES FOR TELBO, JMVAE, BIVCCA ON MNIST-A + +We discuss more hyperparameter choices for the different objectives and how they impact performance on the MNIST-A dataset. Across all the objectives we set $\lambda _ { x } { = } 1$ , and vary $\lambda _ { y }$ . In addition, we also discuss how the private hyperparamter choices for each loss, $\gamma$ for TELBO, $\alpha$ for JMVAE, as in Wang et al. (2016a)) and $\mu$ for BiVCCA affect performance. We use the JS-overall metric for picking hyperparameters, as explained in the main paper. + +![](images/cde83191ec4daa6010cc90c7a347bfde0d62bb6512dfca0f4e7d11dc7eb652b3.jpg) +Figure 11: Randomly sampled images from the TELBO model when fed randomly sampled concepts from the iid training set. We also show the outputs of the observation classifier for the images. Note that we visualize mean images above (since they tend to be more human interpretable) but the classifier is fed samples from the model. Figure best viewed by zooming in. + +Query: 6, small, clockwise, bottom-right + +![](images/fefa3f8d74de211cd7f7d83aeb79bb43beef5def80d74fb90dfdbd1002ae226b.jpg) +Figure 12: Compositional generalization on MNIST-A. Models are given the unseen compositional query shown at the top and each of the three columns shows the mean of the image distribution generated by the models. Images marked with a red box are those that the observation classifier detected as being incorrect. We also show the classification result from the observation classifier on top of each image. We see that TELBO and JMVAE both do really well, while BiVCCA is substantially poorer. + +1. Effect of $\lambda _ { y }$ : We search for $\lambda _ { y }$ values in the set $\{ 1 , 5 0 , 1 0 0 \}$ for all objectives. In general, we find the setting of $\lambda _ { y }$ in the elbo terms to be critical for good performance (especially on correctness). For example, at $\lambda _ { y } { = } 1$ , we find that correctness numbers for the best performing TELBO model drop to 60.47 $( \pm 0 . 3 4 )$ (from 82.08 $( \pm 0 . 5 6 )$ at $\lambda _ { y } = 5 0$ ) on the validation set for iid queries. Similar trends can be observed for the JMVAE and BiVCCA objectives as well (with $\lambda _ { y } = 1 0$ being the best setting for BiVCCA, $\lambda _ { y } = 5 0$ for JMVAE). We have seen qualitative evidence which shows that the likelihood scaling for $\lambda _ { y }$ affects how disentangled the latent space is along the specified attributes. When the latent space is not grouped or organized as per high-level attributes (see Figure 8 for example), the posterior distribution for a given concept is multimodal, which is hard for a gaussian inference network $q ( \mathbf { z } | \mathbf { y } )$ to capture. This leads to poor correctness values. + +2. Effect of $\gamma$ : In addition to the $\lambda _ { y }$ scaling term which is common across all objectives, TELBO has a $\gamma$ scaling factor which controls how we scale the $\log p ( y | z )$ term in the $\mathrm { e l b o } _ { \gamma , 1 } ( \mathbf { y } , \pmb { \theta } _ { y } , \phi _ { y } )$ term. We sweep values of $\{ 1 , 5 0 , 1 0 0 \}$ for this parameter. In general, we find that the effect of this term is smaller on the performance than the $\lambda _ { y }$ term. Based on the setting of this parameter, we find that, for example, the correctness values for fully specified queries change from 82.08 $( \pm 0 . 5 6 )$ at $\gamma { = } 5 0$ to 80.27 $( \pm 0 . 3 8 )$ at $\gamma { = } 1$ on validation set for iid queries. + +3. Effect of $\alpha$ : We generally find that $\alpha { = } 1 . 0$ works best for JMVAE across the different choices explored in Wang et al. (2016a), namely, $\{ 0 . 0 1 , 0 . 1 , 1 . 0 \}$ . For example, decreasing the value of $\alpha$ to 0.1 or 0.01 reduces correctness for fully sepcified queries from 85.63 $( \pm 0 . 2 9 )$ t o 77.58 $( \pm 0 . 2 3 )$ at 0.1 and 74.57 $( \pm 0 . 4 4 )$ at 0.01 respectively on the validation set for iid queries. + +4. Effect of $\mu$ : For BiVCCA, we ran a search for $\mu$ over $\{ 0 . 3 , 0 . 5 , 0 . 7 \}$ , running each training experiment four times, and picked the best hyperparameter choice across the runs. We found that $\mu { = } 0 . 7$ was the best value, however the performance difference across different choices was not very large. Intuitively, higher values of $\mu$ should lead to improved performance compared to lower values of $\mu$ . This is because lower values of $\mu$ mean that we put more weight on the elbo term with a $q ( \mathbf { z } | \mathbf { x } )$ inference network than the one with a $q ( \mathbf { z } | \mathbf { y } )$ inference network, which results in sharper samples. + +# A.7 COMPOSITIONAL GENRALIZATION ON MNIST-A: QUALITATIVE RESULTS AND DETAILS + +We next show some examples of compositional generalization on MNIST-A on a validation set of queries. For the compositinal experiments we reused the parameters of the best models on the iid splits for all the models, and trained the models for $\sim 1 6 0 K$ iterations. All other design choices were the same. Figure 12 shows some qualitative results. + +![](images/8cf44736649a82d0dee93d3dd6407bf1e6b14acd4091e65573ebad1c27c4069d.jpg) + +Figure 13: Set of all 9 images labelled as bald ${ } = 1$ and $\mathtt { m a l e = 0 }$ in the CelebA dataset. We can see that in all the cases the labels are inaccurate for the image, probably due to annotator error. + +![](images/88f1a8db5dd48aabca30b221c9b09a1011be7beaee7d5f327fd0b1494f8e613a.jpg) +Figure 14: TELBO creates more diverse images than JMVAE. At the top we show the set of attributes which are present and absent in the input query. Below, we show the results of generation with all the attributes specified, drawing 10 samples each. We see that both TELBO and JMVAE create accurate images satisfying the constraints. Note that the concept “male” is set to “absent” in the query, which in CelebA means that “female” is present. Next, we unspecify whether the image should contain a male or a female. We see that in this setting, TELBO has a better mixing of male and female images (fourth, sixth, eighth and ninth images in the third row are male), than JMVAE which just produces a single male image (the ninth image in the fourth row). + +# A.8 DETAILS ON CELEBA + +CelebA consists of 202,599 face colored images and 40 attribute binary vectors. We use the version of this dataset that was used in (Perarnau et al., 2016); this uses a subset of 18 visually distinctive attributes, and preprocesses each image so they are aligned, cropped, and scaled down to $6 4 \times 6 4$ . We use the official train and test partitions, 182K for training and 20K for testing. Note that this is an iid split, so the attribute vectors in the test set all occur in the training set, even though the images and people are unique. In total, the original dataset with 40 attributes specified a set of 96486 unique visual concepts, while our dataset of 18 attributes spans 3690 different visual concepts. + +In Section 5.2, we claim that our generations of “Bald” and “Female” images are from a compositionally novel concept. Our claim comes with a minor caveat/clarification: the concept $\mathtt { b a l d } { = } 1$ and $\mathtt { m a l e = 0 }$ does occur in 9 training examples, but they are all incorrect labelings, as shown in Figure 13! Further, we see that the images generated from our model (shown in Figure 5) are qualitatively very different from any of the images here, showing that the model has not memorized these examples. + +# A.9 MORE RESULTS ON CELEBA + +Finally, we show further qualitative examples of performance on the CelebA dataset. We focus on the TELBO and JMVAE objectives here, since BiVCCA generally produces poor samples (see Figure 5). Figure 14 (middle) shows some example generations for the concept specified by the attributes (top). We see that both TELBO and JMVAE produce correct images when provided the full attribute queries (first two rows). However, when we stop specifying attribute “male” or “not male” (female), we see that TELBO provides more diverse samples, spanning both male and female (compared to JMVAE). This ties into the explanation in Appendix A.1, where we show how one can interpret JMVAE as optimizing for the $\bar { \mathrm { K L } } ( q _ { \phi } ^ { \mathrm { a v g } } ( \mathbf { z } | \mathbf { y } _ { i } ) | \bar { q } _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } ) )$ to fit the unimodal inference network $q _ { \phi _ { y } } ( \mathbf { z } | \mathbf { y } _ { i } )$ . Since JMVAE only reasons about the “aggregate” posterior as opposed to the prior (which TELBO reasons about), it has the tendency to generate less diverse samples when shown unseen concepts. \ No newline at end of file diff --git a/parse/train/HkCsm6lRb/HkCsm6lRb_content_list.json b/parse/train/HkCsm6lRb/HkCsm6lRb_content_list.json new file mode 100644 index 0000000000000000000000000000000000000000..7e77ae6e93833d8b4dfd6c9b558a87159811adfe --- /dev/null +++ b/parse/train/HkCsm6lRb/HkCsm6lRb_content_list.json @@ -0,0 +1,2306 @@ +[ + { + "type": "text", + "text": "GENERATIVE MODELS OF VISUALLY GROUNDED IMAGINATION ", + "text_level": 1, + "bbox": [ + 174, + 99, + 823, + 145 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Ramakrishna Vedantam∗ Georgia Tech vrama@gatech.edu ", + "bbox": [ + 184, + 170, + 367, + 212 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Ian Fischer \nGoogle Inc. \niansf@google.com Jonathan Huang \nGoogle Inc. \njonathanhuang@google.com ", + "bbox": [ + 413, + 170, + 553, + 212 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "", + "bbox": [ + 606, + 170, + 813, + 213 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Kevin Murphy Google Inc. kpmurphy@google.com ", + "bbox": [ + 183, + 233, + 349, + 276 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "ABSTRACT ", + "text_level": 1, + "bbox": [ + 454, + 313, + 544, + 327 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "It is easy for people to imagine what a man with pink hair looks like, even if they have never seen such a person before. We call the ability to create images of novel semantic concepts visually grounded imagination. In this paper, we show how we can modify variational auto-encoders to perform this task. Our method uses a novel training objective, and a novel product-of-experts inference network, which can handle partially specified (abstract) concepts in a principled and efficient way. We also propose a set of easy-to-compute evaluation metrics that capture our intuitive notions of what it means to have good visual imagination, namely correctness, coverage, and compositionality (the $3 \\ : C ' s$ ). Finally, we perform a detailed comparison of our method with two existing joint image-attribute VAE methods (the JMVAE method of Suzuki et al. (2017) and the BiVCCA method of Wang et al. (2016b)) by applying them to two datasets: the MNIST-with-attributes dataset (which we introduce here), and the CelebA dataset (Liu et al., 2015). ", + "bbox": [ + 233, + 343, + 766, + 523 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "1 INTRODUCTION ", + "text_level": 1, + "bbox": [ + 176, + 549, + 336, + 565 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Consider the following two-party communication game: a speaker thinks of a visual concept $C$ , such as “men with black hair”, and then generates a description $\\mathbf { y }$ of this concept, which she sends to a listener; the listener interprets the description y, by creating an internal representation $\\mathbf { z }$ , which captures its “meaning”. We can think of $\\mathbf { z }$ as representing a set of “mental images” which depict the concept $C$ . To test whether the listener has correctly “understood” the concept, we ask him to draw a set of real images $S = \\{ \\mathbf { x } _ { s } : s = 1 : S \\}$ , which depict the concept $C$ . He then sends these back to the speaker, who checks to see if the images correctly match the concept $C$ . We call this process visually grounded imagination. ", + "bbox": [ + 174, + 580, + 825, + 693 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "In this paper, we represent concept descriptions in terms of a fixed length vector of discrete attributes $\\mathcal { A }$ . This allows us to specify an exponentially large set of concepts using a compact, combinatorial representation. In particular, by specifying different subsets of attributes, we can generate concepts at different levels of granularity or abstraction. We can arrange these concepts into a compositional abstraction hierarchy, as shown in Figure 1. This is a directed acyclic graph (DAG) in which nodes represent concepts, and an edge from a node to its parent is added whenever we drop one of the attributes from the child’s concept definition. Note that we dont make any assumptions about the order in which the attributes are dropped (that is, dropping the attribute “smiling” is just as valid as dropping “female” in Figure 1). Thus, the tree shown in the figure is just a subset extracted from the full DAG of concepts, shown for illustration purposes. ", + "bbox": [ + 174, + 699, + 825, + 838 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "We can describe a concept by creating the attribute vector $\\mathbf { y } _ { \\mathcal { O } }$ , in which we only specify the value of the attributes in the subset $\\mathcal { O } \\subseteq A$ ; the remaining attributes are unspecified, and are assumed to take all possible legal values. For example, consider the following concepts, in order of increasing abstraction: $C _ { m s b } =$ (male, smiling, blackhair), $C _ { * s b } = ( *$ , smiling, blackhair), and $C _ { * * b } = ( * , * , \\mathrm { b l a c k h a i r } )$ , where the attributes are gender, smiling or not, and hair color, and $^ *$ represents “don’t care”. A good model should be able to generate images from different levels of the abstraction hierarchy, as shown in Figure 1. (This is in contrast to most prior work on conditional generative models of images, which assume that all attributes are fully specified, which corresponds to sampling only from leaf nodes in the hierarchy.) ", + "bbox": [ + 174, + 845, + 825, + 902 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 825, + 174 + ], + "page_idx": 1 + }, + { + "type": "image", + "img_path": "images/df5ae9ce9cf733cf7373f02ab07cee5213fc9e1882dff1aa502a1f29fdf95c60.jpg", + "image_caption": [ + "Figure 1: A compositional abstraction hierarchy for faces, derived from 3 attributes: hair color, smiling or not, and gender. We show a set of sample images generated by our model, when trained on CelebA, for different nodes in this hierarchy. " + ], + "image_footnote": [], + "bbox": [ + 313, + 204, + 681, + 343 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "In Section 2, we show how we can extend the variational autoencoder (VAE) framework of Kingma & Welling (2014) to create models which can perform this task. The first extension is to modify the model to the “multi-modal” setting where we have both an image, x, and an attribute vector, y. More precisely, we assume a joint generative model of the form $\\begin{array} { r } { p ( \\mathbf { x } , \\mathbf { y } , \\mathbf { z } ) = p ( \\mathbf { z } ) p ( \\mathbf { x } | \\mathbf { z } ) p ( \\mathbf { y } | \\mathbf { z } ) } \\end{array}$ , where $p ( \\mathbf { z } )$ is the prior over the latent variable $\\mathbf { z }$ , $p ( \\mathbf { x } | \\mathbf { z } )$ is our image decoder, and $p ( \\mathbf { y } \\vert \\mathbf { z } )$ is our description decoder. We additionally assume that the description decoder factorizes over the specified attributes in the description, so $\\begin{array} { r } { p ( \\mathbf { \\dot { y } } _ { \\mathcal { O } } | \\mathbf { z } ) = \\prod _ { k \\in \\mathcal { O } } p ( y _ { k } | \\mathbf { z } ) } \\end{array}$ . ", + "bbox": [ + 173, + 409, + 825, + 508 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "We further extend the VAE by devising a novel objective function, which we call the TELBO, for training the model from paired data, $\\bar { \\cal D } \\bar { \\bf \\Delta } = \\{ ( { \\bf x } _ { n } , { \\bf y } _ { n } ) \\}$ . However, at test time, we will allow unpaired data (either just a description or just an image). Hence we fit three inference networks: $q ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )$ , $q ( \\mathbf { z } | \\mathbf { x } )$ and $q ( \\mathbf { z } | \\mathbf { y } )$ . This way we can embed an image or a description into the same shared latent space (using $q ( \\mathbf { z } | \\mathbf { x } )$ and $q ( \\mathbf { z } | \\mathbf { y } )$ , respectively); this lets us “translate” images into descriptions or vice versa, by computing $\\begin{array} { r } { p ( \\mathbf { y } | \\mathbf { x } ) = \\int d \\mathbf { z } \\ p ( \\mathbf { y } | \\mathbf { z } ) q ( \\mathbf { z } | \\mathbf { x } ) } \\end{array}$ and $\\begin{array} { r } { p ( \\mathbf { x } | \\mathbf { y } ) = \\int d \\mathbf { z } \\ p ( \\mathbf { x } | \\mathbf { z } ) q ( \\mathbf { z } | \\mathbf { y } ) } \\end{array}$ . ", + "bbox": [ + 173, + 512, + 825, + 598 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "To handle abstract concepts (i.e., partially observed attribute vectors), we use a method based on the product of experts (POE) (Hinton, 2002). In particular, our inference network for attributes has the form $\\begin{array} { r } { q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) \\propto p ( \\mathbf { z } ) \\prod _ { k \\in \\mathcal { O } } q ( \\mathbf { z } | \\mathbf { y } _ { k } ) } \\end{array}$ . If no attributes are specified, the posterior is equal to the prior. As we condition on more attributes, the posterior becomes narrower, which corresponds to specifying a more precise concept. This enables us to generate a more diverse set of images to represent abstract concepts, and a less diverse set of images to represent concrete concepts, as we show below. ", + "bbox": [ + 174, + 603, + 825, + 688 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Section 3 discusses how to evaluate the performance of our method in an objective way. Specifically, we first “ground” the description by generating a set of images, $\\begin{array} { r } { \\mathcal { S } ( \\mathbf { y } _ { \\mathcal { O } } ) = \\{ \\mathbf { x } ^ { s } \\sim p ( \\mathbf { x } | \\mathbf { y } _ { \\mathcal { O } } ) : s = 1 : } \\end{array}$ $S \\}$ . We then check that all the sampled images in $\\scriptstyle { S ( \\mathbf { y } _ { \\mathcal { O } } ) }$ are consistent with the specified attributes $\\mathbf { y } _ { \\mathcal { O } }$ (we call this correctness). We also check that the set of images “spans” the extension of the concept, by exhibiting suitable diversity (c.f. (Young et al., 2014)). Concretely, we check that the attributes that were not specified (e.g., gender in $C _ { * s b }$ above) vary across the different images; we call this coverage. Finally, we want the set of images to have high correctness and coverage even if the concept $\\mathbf { y } _ { \\mathcal { O } }$ has a combination of attribute values that have not been seen in training. For example, if we train on $C _ { m s b } =$ (male, smiling, blackhair), and ${ C _ { f n b } = }$ (female, notsmiling, blackhair), we should be able to test on $C _ { m n b } =$ (male, notsmiling, blackhair), and $C _ { f s b } =$ (female, smiling, blackhair). We will call this property compositionality. Being able to generate plausible images in response to truly compositionally novel queries is the essence of imagination. Together, we call these criteria the 3 C’s of visual imagination. ", + "bbox": [ + 173, + 694, + 826, + 875 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Section 5 reports experimental results on two different datasets. The first dataset is a modified version of MNIST, which we call MNIST-with-attributes (or MNIST-A), in which we “render” modified versions of a single MNIST digit on a $6 4 \\mathrm { x } 6 4$ canvas, varying its location, orientation and size. The second dataset is CelebA (Liu et al., 2015), which consists of over $2 0 0 \\mathrm { k }$ face images, annotated with 40 binary attributes. We show that our method outperforms previous methods on these datasets. ", + "bbox": [ + 174, + 882, + 823, + 924 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "", + "bbox": [ + 171, + 103, + 823, + 132 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "The contributions of this paper are threefold. First, we present a novel extension to VAEs in the multimodal setting, introducing a principled new training objective (the TELBO), and deriving an interpretation of a previously proposed objective (JMVAE) (Wang et al., 2016a) as a valid alternative in Appendix A.1. Second, we present a novel way to handle missing data in inference networks based on a product of experts. Third, we present novel criteria (the 3 C’s) for evaluating conditional generative models of images, that extends prior work by considering the notion of visual abstraction and imagination. ", + "bbox": [ + 174, + 138, + 825, + 237 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "2 METHODS ", + "text_level": 1, + "bbox": [ + 174, + 257, + 290, + 273 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "We start by describing standard VAEs, to introduce notation. We then discuss our extensions to handle the multimodal and the missing input settings. ", + "bbox": [ + 173, + 290, + 823, + 319 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Standard VAEs. A variational autoencoder (Kingma & Welling, 2014) is a latent variable model of the form $p _ { \\pmb { \\theta } } ( \\mathbf { x } , \\mathbf { z } ) = p _ { \\pmb { \\theta } } ( \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )$ , where $p _ { \\pmb { \\theta } } ( \\mathbf { z } )$ is the prior (we assume it is Gaussian, $p _ { \\pmb { \\theta } } ( \\mathbf { z } ) =$ $\\mathcal { N } ( \\mathbf { z } | \\mathbf { 0 } , \\mathbf { I } )$ , although this assumption can be relaxed), and $p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )$ is the likelihood (sometimes called the decoder), usually represented by a neural network. To perform approximate posterior inference, we fit an inference network (sometimes called the encoder) of the form $q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } )$ , so as to maximize $\\mathcal { L } ( \\pmb \\theta , \\phi ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } [ \\mathrm { e l b o } ( \\mathbf { x } , \\pmb \\theta , \\phi ) ]$ , where $\\begin{array} { r } { \\hat { p } ( \\mathbf x ) = \\frac { 1 } { N } \\sum _ { n = 1 } ^ { N } \\delta _ { \\mathbf x _ { n } } ( \\mathbf x ) } \\end{array}$ is the empirical distribution, and ELBO is the evidence lower bound: ", + "bbox": [ + 173, + 333, + 825, + 435 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/354eb706a408a165d0c93e75ff86b58b6cb2919d0e216003cae88d8d3bae57d9.jpg", + "text": "$$\n\\mathrm { e l b o } _ { \\lambda , \\beta } ( \\mathbf { x } , \\pmb { \\theta } , \\phi ) = \\mathbb { E } _ { q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\phi ) } \\left[ \\lambda \\log p _ { \\theta } ( \\mathbf { x } | \\mathbf { z } ) \\right] - \\beta \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } ) , p _ { \\theta } ( \\mathbf { z } ) )\n$$", + "text_format": "latex", + "bbox": [ + 266, + 443, + 730, + 462 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Here $\\mathrm { K L } ( p , q )$ is the Kullback Leibler divergence between distributions $p$ and $q$ . By default, $\\beta =$ $\\lambda = 1$ , in which case we will just write $\\mathrm { e l b o } ( { \\bf x } , \\pmb { \\theta } , \\phi )$ . However, by using $\\beta > 1$ we can encourage the posterior to be closer to the factorial prior $p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\mathbf { 0 } , \\mathbf { I } )$ , which encouarges the latent factors to be “disentangled”, as proved in Achille $\\&$ Soatto (2017); this is known as the $\\beta$ -VAE trick (Higgins et al., 2017a). And allowing $\\lambda > 1$ will be useful later, when we have multiple modalities. ", + "bbox": [ + 173, + 468, + 825, + 540 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Joint VAEs and the TELBO. We extend the VAE to model images and attributes by defining the joint distribution $\\begin{array} { r } { p _ { \\pmb { \\theta } } ( \\mathbf { x } , \\mathbf { y } , \\mathbf { z } ) = p _ { \\pmb { \\theta } } ( \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } ) } \\end{array}$ , where $p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )$ is the image decoder (we use the DCGAN architecture from Radford et al. (2016)), and $p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } )$ is an MLP for the attribute vector. The corresponding training objective which we want to maximize becomes ${ \\mathcal { L } } ( \\theta , \\phi ) =$ $\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { e l b o } ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) \\right]$ , where $\\begin{array} { r } { \\hat { p } ( \\mathbf x , \\mathbf y ) = \\frac { 1 } { N } \\sum _ { n = 1 } ^ { N } \\delta _ { \\mathbf x _ { n } } ( \\mathbf x ) \\delta _ { \\mathbf y _ { n } } ( \\mathbf y _ { n } ) } \\end{array}$ is the empirical distribution derived from paired data, and the joint ELBO is given by ", + "bbox": [ + 173, + 554, + 825, + 643 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/5ff2b02e059b868663f64eabf6562f73c7cd2970eeecb97c627d3c8e2673e210.jpg", + "text": "$$\n\\begin{array} { r l r } & { } & { \\mathrm { e l b o } _ { \\lambda _ { x } , \\lambda _ { y } , \\beta } ( { \\bf x } , { \\bf y } , \\pmb { \\theta } _ { x } , \\pmb { \\theta } _ { y } , \\phi ) = \\mathbb { E } _ { q _ { \\phi } ( { \\bf z } | { \\bf x } , { \\bf y } ) } \\left[ \\lambda _ { x } \\log p _ { \\pmb { \\theta } _ { x } } ( { \\bf x } | { \\bf z } ) + \\lambda _ { y } \\log p _ { \\pmb { \\theta } _ { y } } ( { \\bf y } | { \\bf z } ) \\right] \\quad } \\\\ & { } & { - \\beta \\mathrm { K L } ( q _ { \\phi } ( { \\bf z } | { \\bf x } , { \\bf y } ) , p _ { \\theta } ( { \\bf z } ) ) } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 189, + 651, + 807, + 693 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "We call this the JVAE (joint VAE) model. We usually set $\\beta = 1$ , but set $\\lambda _ { y } / \\lambda _ { x } > 1$ to to scale up the likelihood from the low dimensional attribute vector, $p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } )$ , to match the likelihood from the high dimensional image, $p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )$ . ", + "bbox": [ + 174, + 698, + 823, + 741 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Having fit the joint model above, we can proceed to train unpaired inference networks $q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } )$ and $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )$ , so we can embed images and attributes into the same shared latent space. Keeping the $p$ family fixed from the joint model, a natural objective to fit, say, $q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } )$ is to maximize the following:1 ", + "bbox": [ + 173, + 747, + 825, + 809 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/ed9b51ff0c5d94bc4c093d09977d740989cbe4b934ce945692c060d021611c68.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathcal { L } ( \\phi _ { x } | \\theta ) = - \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\mathrm { K L } ( q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) , p _ { \\theta _ { x } } ( \\mathbf { z } | \\mathbf { x } ) ) \\right] } \\\\ & { \\quad \\quad \\quad = \\displaystyle \\int \\int d \\mathbf { x } d \\mathbf { z } \\hat { p } ( \\mathbf { x } ) q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) \\left[ - \\log q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) - \\log p _ { \\theta _ { x } } ( \\mathbf { x } ) + \\log p _ { \\theta _ { x } } ( \\mathbf { x } | \\mathbf { z } ) + \\log p _ { \\theta } ( \\mathbf { z } ) \\right] } \\\\ & { \\quad \\quad \\quad = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\mathrm { e l b o } ( \\mathbf { x } , \\theta _ { x } , \\phi _ { x } ) \\right] - \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\log p _ { \\theta _ { x } } ( \\mathbf { x } ) \\right] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 813, + 820, + 888 + ], + "page_idx": 2 + }, + { + "type": "image", + "img_path": "images/3626395a8ff14eb60506a0ca4184450c7060dd974d57a894b45710f69c9fe7d6.jpg", + "image_caption": [ + "Figure 2: Illustration of the product of experts inference network. Each expert votes for a part of latent space implied by its observed attribute. The final posterior is the intersection of these regions. When all attributes are observed, the posterior will be a narrowly defined Gaussian, but when some attributes are missing, the posterior will be broader. Right: we illustrate how inclusion of the “universal expert” $p ( \\mathbf { z } )$ in the product ensures that the posterior is always well-conditioned (close to spherical), even when we are missing some attributes. " + ], + "image_footnote": [], + "bbox": [ + 184, + 104, + 820, + 217 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where the last term is constant wrt $\\phi _ { x }$ and the model family $p$ , and hence can be dropped. We can use a similar method to fit $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )$ . Combining these gives the following triple ELBO (TELBO) objective: ", + "bbox": [ + 174, + 309, + 825, + 353 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/a98204e0d2b5d2b0d8d6e94d95849059674c2737eb43916c93cd71c4c20beb34.jpg", + "text": "$$\n\\begin{array} { r l } & { { \\mathcal { L } } ( \\theta _ { x } , \\theta _ { y } , \\phi , \\phi _ { x } , \\phi _ { y } ) = \\mathbf { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { e l b o } _ { 1 , \\lambda , 1 } ( \\mathbf { x } , \\mathbf { y } , \\theta _ { x } , \\theta _ { y } , \\phi ) \\right. } \\\\ & { ~ \\left. ~ + \\mathrm { e l b o } _ { 1 , 1 } ( \\mathbf { x } , \\theta _ { x } , \\phi _ { x } ) + \\mathrm { e l b o } _ { \\gamma , 1 } ( \\mathbf { y } , \\theta _ { y } , \\phi _ { y } ) \\right] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 189, + 362, + 789, + 404 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where $\\lambda$ and $\\gamma$ scale the log likelihood terms $\\log p ( \\mathbf { y } | \\mathbf { z } )$ ; we set these parameters using a validation set. Since we are training the generative model only on aligned data, and simply retrofitting inference networks, we freeze the $p _ { \\pmb { \\theta } _ { x } } ( \\mathbf { x } | \\mathbf { z } )$ and $p _ { \\pmb { \\theta } _ { y } } ( \\mathbf { y } | \\mathbf { z } )$ terms when training the last two ELBO terms above, and just optimize $q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } )$ and $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )$ terms. This enables us to optimize all terms in Equation (2) jointly. Alternatively, we can first fit the joint model, and then fit the unimodal inference networks.2 In Section 4, we compare this to other methods for training joint VAEs that have been proposed in the literature. ", + "bbox": [ + 173, + 409, + 826, + 510 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Handling missing attributes. In order to handle missing attributes at test time, we use a product of experts model, where each attribute instantiates an expert. We are motivated by prior work (Williams & Nash, 2018) which shows that for a linear factor analysis model, the posterior distribution $p ( \\mathbf { z } | \\mathbf { y } )$ is a product of $K$ -dimensional Gaussians, one for each visible dimension. Since our model is just a nonlinear extension of factor analysis, we choose the form of the approximate posterior of our inference network, $q ( \\mathbf { z } | \\mathbf { y } )$ , to be a product of Gaussians, one for each visible feature: $\\begin{array} { r } { q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) \\propto p ( \\mathbf { z } ) \\prod _ { k \\in \\mathcal { O } } q ( \\mathbf { z } | y _ { k } ) } \\end{array}$ , where $q ( \\mathbf { z } | y _ { k } ) { \\overset { \\cdot } { = } } { \\mathcal { N } } ( \\mathbf { z } | \\mu _ { k } ( y _ { k } ) , \\mathbf { C } _ { k } ( y _ { k } ) )$ is the kth Gaussian “expert”, and $p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\boldsymbol { \\mu } _ { 0 } = \\mathbf { 0 } , \\mathbf { C } _ { 0 } = \\mathbf { I } )$ is the prior. A similar model was concurrently proposed in Bouchacourt et al. (2018) to perform inference for a set of images. Unlike the product of experts model in (Hinton, 2002), our model multiplies Gaussians, not Bernoullis, so the product has a closed form solution namely $q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) = \\mathcal { N } ( \\mathbf { z } | \\mu , \\mathbf { C } )$ , where $\\begin{array} { r } { \\mathbf { C } ^ { - 1 } = \\sum _ { k } \\mathbf { C } _ { k } ^ { - 1 } } \\end{array}$ and $\\begin{array} { r } { \\pmb { \\mu } = \\mathbf { C } ( \\sum _ { k } \\mathbf { C } _ { k } ^ { - 1 } \\pmb { \\mu } _ { k } ) } \\end{array}$ , and the sum is over all the observed attributes. Intuitively, y imposes an increasing number of constraints on $\\mathbf { z }$ as more of it is observed, as explained in Williams & Agakov (2002). In our setting, if we do not observe any attributes, the posterior reduces to the prior. As we observe more attributes, the posterior becomes narrower, since the (positive definite) precision matrices, $\\mathbf { C } ^ { - 1 }$ add up, reflecting the increased specificity of the concept being specified, as illustrated in Figure 2 (middle) (see also Williams & Agakov (2002)). We always include the prior term, $p ( \\mathbf { z } )$ , in the product, since without it, the posterior $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } )$ may not be well-conditioned when we are missing attributes, as illustrated in Figure 2 (right). For more implementation-level details on the model architectures, see Appendix A.4. ", + "bbox": [ + 173, + 523, + 826, + 808 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "3 EVALUATION METRICS: THE 3C’S OF VISUAL IMAGINATION ", + "text_level": 1, + "bbox": [ + 173, + 827, + 707, + 844 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "To evaluate the quality of a set of generated images, $S ( \\mathbf { y } _ { \\mathcal { O } } ) = \\{ \\mathbf { x } _ { s } \\sim p ( \\mathbf { x } | \\mathbf { y } _ { \\mathcal { O } } ) : s = 1 : S \\}$ , we apply a multi-label classifier to each image, to convert it to a predicted attribute vector, $\\hat { \\mathbf { y } } ( \\mathbf x )$ . This attribute classifier is trained on a large dataset of images and attributes, and is held constant across all methods that are being evaluated. It plays the role of a human observer. This is similar in spirit to generative adversarial networks (Goodfellow et al., 2014), that declare a generated image to be good enough if a binary classifier cannot distinguish it from a real image. (Both approaches avoid the problems mentioned in Theis et al. (2016) related to evaluating generative image models in terms of their likelihood.) However, the attribute classifier checks not only that the images look realistic, but also that they have the desired attributes. ", + "bbox": [ + 174, + 858, + 820, + 887 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 825, + 202 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "To quantify this, we define the correctness as the fraction of attributes for each generated image that match those specified in the concept’s description: correctness $( \\bar { s } , \\mathbf { y } \\bar { \\omega } ) \\ =$ $\\begin{array} { r } { \\frac { 1 } { | \\mathcal { S } | } \\sum _ { \\mathbf { x } \\in \\mathcal { S } } \\overset { 1 } { \\underset { | \\mathcal { O } | } { \\mid } } \\sum _ { k \\in \\mathcal { O } } \\mathbb { I } ( \\hat { y } ( \\mathbf { x } ) _ { k } = \\overset { \\cdot } { y } _ { k } ) } \\end{array}$ . However, we also want to measure the diversity of values for the unspecified or missing attributes, $\\mathcal { M } = \\mathcal { A } \\backslash \\mathcal { O }$ . We do this by comparing $q _ { k }$ , the empirical distribution over values for attribute $k$ induced by the generated set $s$ , to $p _ { k }$ , the true distribution for this attribute induced by the training set. We measure the difference between these distributions using the Jensen-Shannon divergence, since it is symmetric and satisfies $0 \\leq \\mathrm { J S } ( p , q ) \\leq 1$ . We then define the coverage as follows: $\\begin{array} { r } { \\mathbf { \\bar { c o v e r a g e } } ( S , \\mathbf { y } _ { \\mathcal { O } } ) \\mathbf { \\bar { = } } \\frac { 1 } { | \\mathcal { M } | } \\sum _ { k \\in \\mathcal { M } } ( 1 - \\mathbf { J } \\mathbf { S } ( p _ { k } ^ { - } , q _ { k } ) ) } \\end{array}$ . If desired, we can combine correctness and coverage into a single number, by computing the JS divergence between $p _ { k }$ and $q _ { k }$ for all attributes, where, for observed attributes, $p _ { k }$ is a delta function and $q _ { k }$ is the empirical distribution (we call this JS-overall). This gives us a convenient way to pick hyperparameters. However, for analysis, we find it helpful to report correctness and coverage separately. ", + "bbox": [ + 174, + 208, + 825, + 381 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Note that our metric is different from the inception score proposed in Salimans et al. (2016). That is defined as follows: inception $\\underline { { \\mathbf { \\Pi } } } = \\exp \\left( \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\dot { \\mathrm { K L } } ( p ( y | \\mathbf { x } ) , \\dot { p } ( y \\dot { ) } ) \\right] \\right)$ , where $y$ is a class label. Expanding the term inside the exponential, we get ", + "bbox": [ + 176, + 387, + 825, + 430 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/a98aa03c29b19106faddfa6133d74cf9abf429cd79d3f988ddb49cd4843f9643.jpg", + "text": "$$\n\\sum _ { \\mathbf { x } } p ( \\mathbf { x } ) \\left[ \\sum _ { y } p ( y | \\mathbf { x } ) \\log p ( y | \\mathbf { x } ) \\right] - \\sum _ { \\mathbf { x } } \\sum _ { y } p ( \\mathbf { x } , y ) \\log p ( y ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ - H ( y | \\mathbf { x } ) \\right] + H ( y )\n$$", + "text_format": "latex", + "bbox": [ + 202, + 444, + 794, + 489 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "A high inception score means that the distribution $p ( y | \\mathbf { x } )$ has low entropy, so the generated images match some class, but that the marginal $p ( y )$ has high entropy, so the images are diverse. However, the inception score was created to evaluate unconditional generative models of images, so it does not check if the generated images are consistent with the concept $\\mathbf { y } _ { \\mathcal { O } }$ , and the degree of diversity does not vary in response to the level of abstraction of the concept. ", + "bbox": [ + 173, + 503, + 825, + 574 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Finally, we can assess how well the model understands compositionality, by checking correctness of its generated images in response to test concepts $\\mathbf { y } _ { \\mathcal { O } }$ that differ in at least one attribute from the training concepts. We call this a compositional split of the data. This is much harder than a standard iid split, since we are asking the model to predict the effects of novel combinations of attributes, which it has not seen before (and which might actually be impossible). Note that abstraction is different from compositionality – in abstraction we are asking the model to predict the effects of dropping certain attributes instead of predicting novel combinations of attributes. ", + "bbox": [ + 174, + 580, + 825, + 679 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "4 RELATED WORK ", + "text_level": 1, + "bbox": [ + 176, + 709, + 344, + 724 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "In this section, we briefly mention some of the most closely related prior work. ", + "bbox": [ + 174, + 746, + 689, + 761 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Conditional models. Many conditional generative image models of the form $p ( \\mathbf { y } \\vert \\mathbf { x } )$ have been proposed recently, where y can be a class label (e.g., (Radford et al., 2016)), a vector of attributes (e.g., (Yan et al., 2016)), a sentence (e.g., (Reed et al., 2016)), another image (e.g., (Isola et al., 2017)), etc. Such models are usually based on VAEs or GANs. However, we are more interested in learning a shared latent space from either descriptions y or images x, which means we need to use a joint, symmetric, model. ", + "bbox": [ + 174, + 786, + 825, + 869 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Joint models. Several papers use the same joint VAE model as us, but they differ in how it is trained. In particular, the BiVCCA objective of Wang et al. (2016b) has the form ${ \\mathcal { L } } ( \\theta , \\phi ) =$ ", + "bbox": [ + 173, + 895, + 821, + 924 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "$\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) \\right]$ , where ", + "bbox": [ + 173, + 103, + 370, + 119 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/26aa0f6e50485e7596f6c057e3fe5cc6e52fa317e7327910a8b40b6ac7457b5a.jpg", + "text": "$$\n\\begin{array} { r } { J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) = \\mu \\left( E _ { q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) } [ \\log p \\pmb { \\theta } _ { x } ( \\mathbf { x } | \\mathbf { z } ) + \\lambda \\log p \\pmb { \\theta } _ { y } ( \\mathbf { y } | \\mathbf { z } ) ] - \\mathrm { K L } ( q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) , p \\pmb { \\theta } ( \\mathbf { z } ) ) \\right) } \\\\ { + ( 1 - \\mu ) \\left( E _ { q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) } [ \\log p \\pmb { \\theta } _ { x } ( \\mathbf { x } | \\mathbf { z } ) + \\lambda \\log p \\pmb { \\theta } _ { y } ( \\mathbf { y } | \\mathbf { z } ) ] - \\mathrm { K L } ( q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) , p \\pmb { \\theta } ( \\mathbf { z } ) ) \\right) } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 210, + 125, + 785, + 183 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "This method results in the model generating the mean image corresponding to each concept, due to the $E _ { q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) } \\log p _ { \\theta } ( \\mathbf { x } , \\mathbf { y } | \\mathbf { z } )$ term, which requires that $\\mathbf { z }$ ’s sampled from $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { n } )$ be good at generating all the different ${ \\bf x } _ { n }$ ’s which co-occur with ${ \\bf y } _ { n }$ . We show this empirically in Section 5. This problem can be partially compensated for by increasing $\\mu$ , but that reduces the $\\operatorname { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { y } ) , p _ { \\theta } ( \\mathbf { z } ) )$ penalty, which is required to ensure $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )$ is a broad distribution with good coverage of the concept. ", + "bbox": [ + 173, + 184, + 826, + 260 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The JMVAE objective of Suzuki et al. (2017) has the form $\\mathcal { L } ( \\pmb { \\theta } , \\phi ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) \\right]$ , where ", + "bbox": [ + 174, + 265, + 823, + 284 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/f2cc1d0a293b78779b4c642a8712092de21675f350b25d543f98332949ebb4f0.jpg", + "text": "$$\nI ( \\mathbf { x } , \\mathbf { y } , \\boldsymbol { \\theta } , \\boldsymbol { \\phi } ) = \\mathrm { e l b o } _ { 1 , \\boldsymbol { \\lambda } , 1 } ( \\mathbf { x } , \\mathbf { y } , \\boldsymbol { \\theta } , \\boldsymbol { \\phi } ) - \\alpha \\left[ \\mathrm { K L } ( q _ { \\boldsymbol { \\phi } } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) , q _ { \\boldsymbol { \\phi } _ { y } } ( \\mathbf { z } | \\mathbf { y } ) ) + \\mathrm { K L } ( q _ { \\boldsymbol { \\phi } } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) , q _ { \\boldsymbol { \\phi } _ { x } } ( \\mathbf { z } | \\mathbf { x } ) ) \\right]\n$$", + "text_format": "latex", + "bbox": [ + 181, + 289, + 826, + 316 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "At first glance, forcing $q _ { \\phi } ( \\mathbf { z } | \\mathbf { y } )$ to be close to $q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )$ seems undesirable, since the latter will typically be close to a delta function, since there is little posterior uncertainty in $\\mathbf { z }$ once we see the image x. However, in Appendix A.1, we use results from Hoffman $\\&$ Johnson (2016) to show that $\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) ) \\right]$ can be written in terms of $\\operatorname { K L } ( q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) )$ , where $q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } ) = \\mathbf { \\bar { \\mathbb { E } } } _ { \\hat { p } ( \\mathbf { x } | \\mathbf { y } ) } \\left[ q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) \\right]$ is the aggregated posterior over $\\mathbf { z }$ induced by all images $\\mathbf { x }$ which are associated with description $\\mathbf { y }$ . This ensures that $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )$ will cover the embeddings of all the images associated with concept $\\mathbf { y }$ . However, since there is no $\\mathrm { K L } ( q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) , p _ { \\pmb { \\theta } } ( \\mathbf { z } ) )$ term, the diversity of the samples is slightly reduced for novel concepts compared to TELBO, as we show empirically in Section 5. On the flip side, the benefit of using the aggregated posterior to fit the $q ( \\mathbf { z } | \\mathbf { y } )$ inference network is that one can expect sharper images, as this ensures we will sample $\\mathbf { z } \\sim q ( \\mathbf { z } | \\mathbf { y } )$ which have been seen by the image decoder $p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )$ during joint training. If the aggregated posterior does not exactly match the prior (which is known to happen in VAE-type models, see Hoffman & Johnson (2016)) then regularizing with respect to the prior (as TELBO does) can generate samples in parts of space not seen by the image decoder, which can potentially lead to less “correct” samples. Again, our empirical findings in Section 5 confirm this tradeoff between correctness and coverage implicit in choices of TELBO vs. JMVAE. ", + "bbox": [ + 173, + 320, + 826, + 560 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The SCAN method of Higgins et al. (2017b) first fits a standard $\\beta$ -VAE model (Higgins et al., 2017a) on unlabeled images (or rather, features derived from images using a pre-trained denoising autoencoder) by maximizing $\\mathcal { L } ( \\pmb { \\theta } _ { x } , \\pmb { \\phi } _ { x } ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) }$ $[ \\mathrm { e l b o } _ { 1 , \\beta _ { x } } ( \\mathbf { x } , \\pmb { \\theta } _ { x } , \\phi _ { x } ) ]$ . They then fit a second VAE by maximizing $\\mathcal { L } ( \\pmb { \\theta } _ { y } , \\pmb { \\phi } _ { y } ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } , \\phi _ { x } ) \\right]$ , where ", + "bbox": [ + 173, + 565, + 825, + 628 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/ed07a8dc052c068858b2fe6cc0170be15c6fa425ccdbdeede77644a0f3d80493.jpg", + "text": "$$\nJ ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } , \\phi _ { x } ) = \\mathrm { { e l b o } } _ { 1 , \\beta _ { y } } ( \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } ) - \\alpha \\mathrm { { K L } } ( q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) )\n$$", + "text_format": "latex", + "bbox": [ + 258, + 632, + 736, + 651 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "This is very similar to JMVAE, since $q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) \\approx q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )$ , when $\\displaystyle ( \\mathbf { x } , \\mathbf { y } )$ is a matching pair of images and labels. An important difference, however, is that SCAN treats the attribute vectors $\\mathbf { y }$ as atomic symbols; this has the advantage that there is no need to handle missing inputs, but the disadvantage that they cannot infer the meaning of unseen attribute combinations at test time, unless they are “taught” them by having them paired with images. Also, they rely on $\\beta _ { x } > 1$ as a way to get compositionality, assuming that a disentangled latent space will suffice. However, in Appendix A.3, we show that unsupervised learning of the latent space given images alone can result in poor results when some of the attributes in the compositional concept hierarchy are non-visual, such as parity of an MNIST digit. Our approach always takes the labels into consideration when learning the latent space, permitting well-organized latent spaces even in the presence of non-visual concepts (c.f. the difference between PCA and LDA). ", + "bbox": [ + 173, + 657, + 826, + 810 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Handling missing inputs. Conditional generative models of images, of the form $p ( \\mathbf { x } | \\mathbf { y } )$ , have problems with missing input attributes, as do inference networks $q ( \\mathbf { z } | \\mathbf { y } )$ for VAEs. Hoffman (2017) uses MCMC to fit a latent Gaussian model, which can in principle handle missing data; however, he initializes the Markov chain with the posterior mode computed by an inference network, which cannot easily handle missing inputs. One approach we can use, if we have a joint model, is to estimate or impute the missing values, as follows: $\\hat { \\mathbf { y } } = \\arg \\operatorname* { m a x } _ { \\mathbf { y } _ { \\mathcal { M } } } p ( \\mathbf { y } _ { \\mathcal { M } } | \\mathbf { y } _ { \\mathcal { O } } )$ , where $p ( \\mathbf { y } _ { \\mathcal { M } } , \\mathbf { y } _ { \\mathcal { O } } )$ models dependencies between attributes. We can then sample images using $p ( \\mathbf { x } | \\hat { \\mathbf { y } } )$ . This approach was used in Yan et al. (2016) to handle the case where some of the pixels being passed into an inference network were not observed. However, conditioning on an imputed value will give different results from not conditioning on the missing inputs; only the latter will increase the posterior uncertainty in order to correctly represent less precise concepts with broader support. ", + "bbox": [ + 173, + 825, + 825, + 924 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 823, + 159 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Gaussian embeddings. There are many papers that embed images and text into points in a vector space. However, we want to represent concepts of different levels of abstraction, and therefore want to map images and text to regions of latent space. There are some prior works that use Gaussian embeddings for words (Vilnis & McCallum, 2015; Athiwaratkun & Wilson, 2017), sometimes in conjunction with images (Mukherjee & Hospedales, 2016; Ren et al., 2016). Our method differs from these approaches in several ways. First, we maximize the likelihood of $\\displaystyle ( \\mathbf { x } , \\mathbf { y } )$ pairs, whereas the above methods learn a Gaussian embedding using a contrastive loss. Second, our PoE formulation ensures that the covariance of the posterior $q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } )$ is adaptive to the data that we condition on. In particular, it becomes narrower as we observe more attributes (because the precision matrices sum up), which is a property not shared by other embedding methods. ", + "bbox": [ + 174, + 176, + 825, + 315 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Abstraction and compositionality. Young et al. (2014) represent the extension of a concept (described by a noun phrase) in terms of a set of images whose captions match the phrase. By contrast, we use a parametric probability distribution in a latent space that can generate new images. Vendrov et al. (2016) use order embeddings, where they explicitly learn subsumption-like relationships by learning a space that respects a partial order. In contrast, we reason about generality of concepts via the uncertainty induced by their latent representation. There has been some work on compositionality in the language/vision literature (see e.g., Atzmon et al. (2016); Johnson et al. (2017); Agrawal et al. (2017)), but none of these papers use generative models, which is arguably a much more stringent test of whether a model has truly “understood” the meaning of the components which are being composed. ", + "bbox": [ + 174, + 332, + 825, + 470 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "5 EXPERIMENTAL RESULTS ", + "text_level": 1, + "bbox": [ + 176, + 492, + 415, + 508 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "In this section, we fit the JVAE model to two different datasets (MNIST-A and CelebA), using the TELBO objective, as well as BiVCCA and JMVAE. We measure the quality of the resulting model using the 3 C’s, and show that our method of handling missing data behaves in a qualitatively reasonable way. ", + "bbox": [ + 174, + 525, + 825, + 580 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "5.1 MNIST-A ", + "text_level": 1, + "bbox": [ + 174, + 598, + 287, + 613 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Dataset. In this section, we report results on the MNIST-A dataset. This is created by modifying the original MNIST dataset as follows. We first create a compositional concept hierarchy using 4 discrete attributes, corresponding to class label (10 values), location (4 values), orientation (3 values), and size (2 values). Thus there are $1 0 { \\times } 2 { \\times } 3 { \\times } 4 = 2 4 0$ unique concepts in total. We then sample $\\sim 2 9 0$ example images of each concept, and create both an iid and compositional split of the data. See Appendix A.2 for details. ", + "bbox": [ + 174, + 625, + 825, + 709 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Models and algorithms. We train the JVAE model on this dataset using TELBO, BiVCCA and JMVAE objectives. We use Adam (Kingma & Ba, 2015) for optimization, with a learning rate of 0.0001, and a minibatch size of 64. We train all models for 250,000 steps (we generally found that the models do not tend to overfit in our experiments). Our models typically take around a day to train on NVIDIA Titan X GPUs. For the image models, $p ( \\mathbf { x } | \\mathbf { z } )$ and $q ( \\mathbf { z } | \\mathbf { x } )$ , we use the DCGAN architecture from Radford et al. (2016). Our generated images are of size $6 4 \\times 6 4$ , as in Radford et al. (2016). For the attribute models, $p ( y _ { k } | \\mathbf { z } )$ and $q ( \\mathbf { z } | y _ { k } )$ , we use MLPs. For the joint inference network, $q ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )$ , we use a CNN combined with an MLP. We use $d = 1 0$ latent dimensions for all models. We choose the hyperparameters for each method so as to maximize JS-overall, which is an overall measure of correctness and coverage (see Section 3) on a validation set of attribute queries. See Appendix A.4 for further details on the model architectures. ", + "bbox": [ + 173, + 726, + 825, + 878 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Evaluation. To measure correctness and coverage, we first train the observation classifier on the full iid dataset, where it gets to an accuracy of $9 1 . 1 8 \\%$ for class label, $9 0 . 5 6 \\%$ for scale, $9 2 . 2 3 \\%$ for orientation, and $100 \\%$ for location. Consequently, it is a reliable way to assess the quality of samples from various generative models (see Appendix A.5 for details). We then compute correctness and coverage on the iid dataset, and coverage on the comp dataset. ", + "bbox": [ + 174, + 896, + 823, + 924 + ], + "page_idx": 6 + }, + { + "type": "image", + "img_path": "images/216614ff4d58de7325957c620c11d08b9ac4d0b78fb017fed0bf9166d2831af1.jpg", + "image_caption": [ + "Query: 0, small, clockwise, top-right ", + "Figure 3: Samples from attribute vectors seen at training time, generated by the 3 different models. We plot the posterior mean of each pixel, $\\mathbb { E } \\left[ \\mathbf { x } | \\mathbf { z } _ { s } \\right]$ , where $\\mathbf { z } _ { s } \\sim \\hat { q } _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )$ . The caption at the top of each little image is the predicted attribute values. The border of the generated image is red if any of the attributes are predicted incorrectly. (The observation classifier is fed sampled images, not the mean image that we are showing here.) " + ], + "image_footnote": [], + "bbox": [ + 184, + 128, + 816, + 257 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "", + "bbox": [ + 176, + 342, + 823, + 383 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Familiar concrete concepts. We start by assessing the quality of the models in the simplest setting, which is where the test concepts are fully specified (i.e., all attributes are known), and the concepts have been seen before in the training set (i.e., we are using the iid split). Figure 4a shows the correctness scores for the three methods. (Since the test concepts are fully grounded, coverage is not well defined, since there are no missing attributes.) We see that TELBO has a correctness of $8 2 . 0 8 \\%$ , which is close to that of JMVAE $( 8 5 . 1 5 \\% )$ ; both methods significantly outperform BiVCCA $( 6 7 . 3 8 \\% )$ . To gain more insight, Figure 3 shows some samples from each of these methods for a leaf concept chosen at random. We see that the images generated by BiVCCA are very blurry, for reasons we discussed in Section 4. Note that these blurry images are correctly detected by the attribute classifier.3 We also see that the JMVAE samples all look good (in this example). Most of the samples from TELBO are also good, although there is one error (correctly detected by the attribute classifier). ", + "bbox": [ + 173, + 404, + 826, + 556 + ], + "page_idx": 7 + }, + { + "type": "table", + "img_path": "images/0faabdc7b40f83eded736f7ec49e2e40b2a62fba35641045b2969b9692bc11f9.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
Method#AttributesCoverage (%)Correctness (%)
iid split
TELBO482.08±0.56
JMVAE85.15 ±0.26
BiVCCA67.38 ±0.69
TELBO391.14 ± 0.5381.63 ± 0.38
JMVAE88.52 ± 0.3782.00 ±0.37
BiVCCA85.28 ±0.6870.68 ± 0.87
TELBO290.32 ± 0.5782.03 ± 1.37
JMVAE87.89 ±0.6981.02 ± 1.05
BiVCCA85.09 ±0.7672.33 ± 2.31
TELBO190.94 ±0.1983.67 ± 1.70
JMVAE88.70 ±0.3581.58 ± 1.78
BiVCCA85.53 ± 0.2768.36 ± 2.21
Compositional split
TELBO475.61 ± 1.43
JMVAE76.86 ± 1.30
BiVCCA68.58 ± 1.02
", + "bbox": [ + 196, + 577, + 434, + 746 + ], + "page_idx": 7 + }, + { + "type": "image", + "img_path": "images/67115530c872ea1da2927de9b0adb176a254c84c012a930b88a6d53d578942b5.jpg", + "image_caption": [ + "(b) Mean images generated by TELBO and JMVAE in response to queries at different levels of abstraction, starting from abstract (top) to refined (bottom). " + ], + "image_footnote": [], + "bbox": [ + 465, + 589, + 816, + 743 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "(a) Evaluation of different approaches on the test set. Higher numbers are better. We report standard deviation across 5 splits of the test set. ", + "bbox": [ + 196, + 755, + 434, + 806 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Figure 4: (a) We show quantitaive results on the 3C’s on MNIST-A. (b) Qualitative results on MNIST-A for various queries. For refined/fully specified queries, we can see that both TELBO and JMVAE produce good correctness, i.e., the images produced follow constraints placed by the specified attributes. When the attribute ‘orientation’ is unspecified, we see that TELBO produces upright and counter clockwise digits, while JMVAE produces clockwise and upright digits. Finally, when we leave the digit unspecified (top), we see that TELBO appears to generate a more diverse set of digits (9, 3, 8, 6) while JMVAE produces 0 and 3. ", + "bbox": [ + 173, + 818, + 825, + 893 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Novel abstract concepts. Next we assess the quality of the models when the test concepts are abstract, i.e., one or more attributes are not specified. (Note that the model was never trained on such abstract concepts.) Figure 4a shows that the correctness scores for JMVAE seems to drop somewhat (from about $85 \\%$ to about $8 1 . 5 \\%$ ), although it remains steady for TELBO and BiVCCA. We also see that the coverage of TELBO is higher than the other methods, due to the use of the $\\mathrm { K L } ( q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) , p _ { \\pmb { \\theta } } ( \\mathbf { z } ) )$ regularizer, as we discussed in Section 4. Figure 4b illustrates how the methods respond to concepts of different levels of abstraction. The samples from the TELBO seem to be more diverse, which is consistent with the numbers in Figure 4a. ", + "bbox": [ + 173, + 103, + 825, + 215 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "Compositionally novel concrete concepts. Finally we assess the quality of the models when the test concepts are fully specified, but have not been seen before (i.e., we are using the comp split). Figure 4a shows some quantitative results. We see that the correctness for TELBO and JMVAE has dropped from about $82 \\%$ to about $7 5 \\%$ , since this task is much harder, and requires “strong generalization”. However, as before, we see that both TELBO and JMVAE outperform BiVCCA, which has a correctness of about $69 \\%$ . See Appendix A.7 qualitative results and more details. ", + "bbox": [ + 174, + 234, + 825, + 319 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "5.2 CELEBA ", + "text_level": 1, + "bbox": [ + 174, + 338, + 274, + 353 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "In this section, we report results on the CelebA dataset (Liu et al., 2015). In particular, we use the version that was used in Perarnau et al. (2016), which selects 18 visually distinctive attributes, and generate images of size $6 4 \\times 6 4$ ; see Appendix A.8 for more details on the CelebA dataset and Appendix A.4 for details of the model architectures. Figure 5 shows some sample qualitative results. On the top left, we show some images which were generated by the three methods given the concept shown in the left column. TELBO and JMVAE generate realistic and diverse images. That is, the generated images are generally of males, with mouth slightly open and smiling attributes present in the images. On the other hand, BiVCCA just generates the mean image. On the bottom left, we show what happens when we drop some attributes, thus specifying more abstract concepts. We see that when we drop the gender, we get a mixture of both male and female images for both TELBO and JMVAE. Going further, when we drop the “smiling” attribute, we see that the samples now comprise of people who are smiling as well as not smiling, and we see a mixture of genders in the samples. Further, while we see a greater diversity in the samples, we also notice a slight drop in image quality (presumably because none of the approaches has seen supervision with just ‘abstract’ concepts). See Appendix A.9 for more qualitative examples on CelebA. On the top right, we show some examples of visual imagination, where we ask the models to generate images from the concept “bald female”, which does not occur in the training set.4 (We omit the results from BiVCCA, which are uniformly poor.) We see that both TELBO and JMVAE can sometimes do a fairly reasonable job (although these are admittedly cherry picked results). Finally, the bottom right illustrates an interesting bias in the dataset: if we ask the model to generate images where we do not specify the value of the eyeglasses attribute, nearly all of the samples fail to included glasses, since the prior probability of this attribute is rare (about $6 \\%$ ). ", + "bbox": [ + 173, + 366, + 825, + 671 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "6 CONCEPT NAMING WITH IMAGINATION MODELS ", + "text_level": 1, + "bbox": [ + 174, + 695, + 612, + 710 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "In this section, we demonstrate initial results which show that our imagination models can be used for concept naming, where the task is to assign a label to a set of images illustrating the concept depicted by the images. A similar problem has been studied in previous work such as Tenenbaum (1999) and Jia et al. (2013). Tenenbaum (1999) studies a set naming problem with integers (instead of images), and show that construct a likelihood function given a hypothesis set that can capture notions of the minimal/smallest hypothesis that explains the observed samples in the set. Jia et al. (2013) extend this approach to concept-naming on images, incorporating perceptual uncertainty (in recognizing the contents of an image) using a confusion matrix weighted likelihood term. While this approach first extracts labels for each image and then performs concept naming, here we test how well our generative model itself is able to generalize to concept naming without ever performing explicit classification on the images. ", + "bbox": [ + 173, + 728, + 825, + 881 + ], + "page_idx": 8 + }, + { + "type": "image", + "img_path": "images/b6b6e00f19c0762479d47d8ed6c0293c054705b7c21da5444678f934722760b6.jpg", + "image_caption": [ + "Figure 5: Sample CelebA results. Left: we show the attributes specified to be present or absent when generating images. Middle: we show 10 samples each generated from TELBO, JMVAE and BiVCCA. We see that TELBO and JMVAE genreate better samples than BiVCCA which collapses to the mean. Middle, bottom: We show five samples from TELBO and JMVAE in response to queries with unspecified attributes, and see that both approaches generate a mix in the samples, generalizing meaningfully across unspecified attributes. " + ], + "image_footnote": [], + "bbox": [ + 179, + 101, + 825, + 252 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "In more detail, the problem setup in concept naming is as follows: we are given as input a set $\\mathcal { X }$ of images, each of which corresponds to a concept in the compositional abstraction hierarchy Figure 1. The task is to assign a label $\\mathbf { y } \\in \\mathcal { V }$ to the set of images. One of the key challenges in concept learning is to understand “how far” to generalize in the concept hierarchy given a limited number of positive examples (Tenenbaum, 1999). That is, given a small set of images with 7 in the top-left corner and bottom-right corner, one must infer that the concept is “7” as opposed to “7, top-left”. In other words, we wish to find the least common ancestor (in the concept hierarchy) corresponding to all the images in the set, given any number of images in the set, so that we can be consistent with the set. We consider two heuristic solutions to this problem: ", + "bbox": [ + 173, + 359, + 826, + 484 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "1. Concept-NB: In this approach we compute arg maxy $p ( \\mathbf { y } | \\boldsymbol { \\mathcal { X } } )$ , where $p ( \\mathbf { y } | \\boldsymbol { \\mathcal { X } } )$ is computed using the naive bayes assumption: ", + "bbox": [ + 214, + 498, + 823, + 529 + ], + "page_idx": 9 + }, + { + "type": "equation", + "img_path": "images/fe00e9044e8f4ba52a0f743c8651491c622a25b57fd5209038de55b6766e6686.jpg", + "text": "$$\np ( \\mathbf { y } | \\mathcal { X } ) \\propto p ( \\mathbf { y } ) \\Pi _ { \\mathbf { x } _ { n } \\in \\mathcal { X } } p ( \\mathbf { x } _ { n } | \\mathbf { y } ) = p ( \\mathbf { y } ) \\Pi _ { \\mathbf { x } _ { n } \\in \\mathcal { X } } \\int d \\mathbf { z } _ { n } p ( \\mathbf { x } _ { n } | \\mathbf { z } _ { n } ) q ( \\mathbf { z } _ { n } | \\mathbf { y } )\n$$", + "text_format": "latex", + "bbox": [ + 290, + 536, + 764, + 569 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "where $p ( y )$ is chosen to be uniform across all concepts, and the integrals are approximated using Monte Carlo. ", + "bbox": [ + 225, + 577, + 823, + 604 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "2. Concept-Latent: In this approach, instead of working in the observed space, we work in the latent space. That is, we pick a $\\mathrm { r g m i n } _ { \\mathbf { y } } \\mathrm { K L } ( q ( \\mathbf { z } | \\mathcal { X } ) | \\bar { q ( \\mathbf { z } | \\mathbf { y } ) } )$ , where $q ( \\mathbf { z } | \\mathcal { X } )$ is approximated using $\\bar { \\sum _ { \\mathbf { x } \\in \\mathcal { X } } q ( \\mathbf { z } | \\mathbf { x } ) }$ , which is a mixture of gaussians. The KL divergence can be computed analytically by considering the first two moments of the gaussian mixture5. ", + "bbox": [ + 214, + 611, + 825, + 670 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "6.1 EXPERIMENTAL SETUP ", + "text_level": 1, + "bbox": [ + 174, + 689, + 375, + 704 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "We use the MNIST-A dataset for the concept naming studies. We consider the fully specified attribute labels in the MNIST-A hierarchy, and consider differrent patterns of missingness (corresponding to different nodes in the abstraction hirearchy) by dropping attributes. Specifically, we ignore the case where no attribute is specified, and consider a uniform distribution over the rest of the $\\mathsf { \\bar { ( 2 ^ { 4 } - 1 = 1 5 ) } }$ ) patterns of missingness. Now, for each fully specified attribute pattern in the iid split of MNIST-A, we sample four missingness patterns and repeat across all fully specified attributes to form a bank of 960 candidate names that a model must choose. We randomly select three subsets of 100 candidate names (and the corresponding images) to form the query set for concept naming, namely tuples of $( \\mathbf { y } , { \\mathcal { X } } )$ . Specifically, given all the images in the eval set for a concept $\\mathbf { y }$ , we form $\\mathcal { X }$ using a randomly sampled subset of 5 images. We report the accuracy metric, measuring how often the selected concept for a set $\\mathcal { X }$ matches the ground truth concept, across three different splits of 100 datapoints. ", + "bbox": [ + 173, + 715, + 825, + 869 + ], + "page_idx": 9 + }, + { + "type": "table", + "img_path": "images/de1005f334ee6357d8870f02be529d5d15e2391104a2cfa40168880bfa499745.jpg", + "table_caption": [ + "Table 1: Accuracy of Imagination models on Concept Naming. Higher is better. " + ], + "table_footnote": [], + "table_body": "
ApproachConcept-Latent (%)Concept-NB (%)
TELBO35.66 ± 2.0517.66 ± 1.70
JMVAE54.66 ± 4.9213.33 ± 2.05
BiVCCA28.00 ± 4.5418.00 ± 1.40
Random0.28±0.000.28±0.00
Most Frequent6.33 ± 1.886.33 ± 1.88
", + "bbox": [ + 369, + 101, + 627, + 176 + ], + "page_idx": 10 + }, + { + "type": "image", + "img_path": "images/d8dbbd7899942a27afafc0400945fd04332ca9dcd37f0361b8f6a7b42039a005.jpg", + "image_caption": [ + "Figure 6: A qualitative illustration of some of the examples from concept naming models. Top-left: an example of a sample that is correctly named by a Concept-NB model. However, the Concept-NB model is not that strong and often gets simple concepts such as digits incorrect, making mistakes between 6 and 0, for example (bottom-left). This is likely because the only way in which the Concept-NB approach reasons about the set is not via a \"meaningful\" low dimensional latent variable but via a sampling distribution on a high dimensional space of images. The Concept-Latent model is able to do better on the same set of images, and classify the set as the concept “6”. Finally, we show a failure case of the model where it incorrectly classifies the digits as being large (there is a small digit in the set), and ignores the fact that all of the digits are in the top-left. " + ], + "image_footnote": [], + "bbox": [ + 179, + 227, + 816, + 371 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "6.2 RESULTS ", + "text_level": 1, + "bbox": [ + 174, + 520, + 277, + 534 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "We evaluate the best versions of TELBO, JMVAE, and BiVCCA on the iid split of MNIST-A for concept naming (Table 1). In general, we find that Concept-NB approaches perform significantly worse than Concept-Latent approaches. For example, the best Concept-NB approach (using TELBO/BiVCCA objective) gets to an accuracy of around $1 8 \\%$ , while Concept-Latent using JMVAE gets to $5 4 . 6 6 \\pm 4 . 9 2 \\%$ . In general, these numbers are better than a random chance baseline which would get to $0 . 2 8 \\%$ (picking one of 348 effective options, after collating the 960 candidate names based on missingness patterns), while picking the most frequent (ground truth) fully-specified y depicted across an image set gets to $6 . 3 \\bar { 3 } \\pm 1 . \\bar { 8 } 8 \\%$ . Figure 6 shows some qualitative examples from Concept-NB as well as Concept-Latent models for concept / set classification. We observe that the Concept-Latent models are much more powerful than using Concept-NB in terms of naming the concept based on few positive examples from the support set. ", + "bbox": [ + 173, + 547, + 825, + 702 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "7 CONCLUSIONS AND FUTURE WORK ", + "text_level": 1, + "bbox": [ + 176, + 728, + 496, + 743 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "We have shown how to create generative models which can “imagine” compositionally novel concrete and abstract visual concepts. In the future we would like to explore richer forms of description, beyond attribute vectors, such as natural language text, as well as compositional descriptions of scenes, which will require dealing with a variable number of objects. ", + "bbox": [ + 174, + 763, + 825, + 819 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "ACKNOWLEDGMENTS ", + "text_level": 1, + "bbox": [ + 176, + 842, + 326, + 854 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "We would like to thank Hernan Moraldo for his help in writing the JVAE library, Alex Alemi for valuable insights on TELBO and JMVAE, and Sergio Guadarrama and Harsh Satija for numerous discussions around the project. Finally we would like to thank Devi Parikh for advice on the CelebA experiments, and Stefan Lee and Yash Goyal for feedback on an initial version of this draft. ", + "bbox": [ + 174, + 867, + 825, + 922 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "REFERENCES ", + "text_level": 1, + "bbox": [ + 176, + 102, + 287, + 117 + ], + "page_idx": 11 + }, + { + "type": "text", + "text": "Alessandro Achille and Stefano Soatto. On the emergence of invariance and disentangling in deep representations. arXiv, 5 June 2017. 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", + "bbox": [ + 174, + 707, + 825, + 750 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "A APPENDIX ", + "text_level": 1, + "bbox": [ + 176, + 102, + 299, + 118 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "A.1 ANALYSIS OF JMVAE OBJECTIVE ", + "bbox": [ + 176, + 132, + 454, + 148 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "The JMVAE objective of (Suzuki et al., 2017) has the form ", + "bbox": [ + 173, + 159, + 562, + 174 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/4b16c075128e93cc1b4abce93d5ddf2780c6e3b31ee8db3a6d8942042d3196f6.jpg", + "text": "$$\nJ ( \\mathbf { x } , \\mathbf { y } , \\theta , \\phi ) = \\operatorname { e l b o } ( \\mathbf { x } , \\mathbf { y } , \\theta , \\phi ) - \\alpha \\left[ \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) ) + \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) , q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) ) \\right]\n$$", + "text_format": "latex", + "bbox": [ + 183, + 180, + 813, + 207 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Let us focus on the $\\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) )$ term. Let $\\mathcal { V }$ be the set of unique labels (attribute vectors) in the training set, $\\mathcal { X } _ { i }$ be the indices of the images associated with label $\\mathbf { y } _ { i }$ , and let $N _ { i } = | \\mathcal { X } _ { i } |$ be the size of that set. Then we can write ", + "bbox": [ + 174, + 212, + 825, + 257 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/85052c8f00f15282deac81a90031dac109c48d61909c3fcc84cbc0554661c4f3.jpg", + "text": "$$\n\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) ) \\right] = \\frac { 1 } { | \\mathcal { y } | } \\sum _ { i \\in \\mathcal { Y } } \\frac { 1 } { N _ { i } } \\sum _ { n \\in \\mathbf { X } _ { i } } \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) )\n$$", + "text_format": "latex", + "bbox": [ + 212, + 261, + 782, + 300 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "As explained in (Hoffman & Johnson, 2016), we can rewrite this by treating the index $n \\in$ $\\{ 1 , \\cdots , N _ { i } \\}$ as a random variable, with prior $q ( n | \\mathbf { y } _ { i } ) = 1 / N _ { i }$ . Also, let us define the likelihood $q ( \\mathbf { z } | n , \\mathbf { y } _ { i } ) \\stackrel { - } { = } q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } )$ . Using this notation, we can show that the above average KL becomes ", + "bbox": [ + 173, + 305, + 825, + 348 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/6cc99c7bba48d5c5ad1d0c79ba5b3d7e7b26754662d2c8f9b2296add5e677901.jpg", + "text": "$$\n\\frac { 1 } { | \\mathcal { D } | } \\sum _ { i \\in \\mathcal { Y } } \\Big \\{ \\mathrm { K L } ( q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) ) + \\log N _ { i } - \\mathbb { E } _ { q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) } \\left[ \\mathbb { H } ( q ( n | \\mathbf { z } , \\mathbf { y } _ { i } ) ) \\right] \\Big \\}\n$$", + "text_format": "latex", + "bbox": [ + 245, + 354, + 751, + 392 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "where ", + "bbox": [ + 173, + 398, + 217, + 412 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/111366f6b2660171423160380eed1a1e275c3ae6c2a3c3882228daf31426304e.jpg", + "text": "$$\nq _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) = \\frac { 1 } { N _ { i } } \\sum _ { n \\in \\mathcal { X } _ { i } } q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } )\n$$", + "text_format": "latex", + "bbox": [ + 379, + 407, + 617, + 446 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "is the average of the posteriors for that concept, and $q ( n | \\mathbf { z } , \\mathbf { y } _ { i } )$ is the posterior over the indices for all the possible examples from the set $\\mathcal { X } _ { i }$ , given that the latent code is $\\mathbf { z }$ and the description is $\\mathbf { y } _ { i }$ . ", + "bbox": [ + 173, + 449, + 825, + 478 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "The $\\operatorname { K L } ( q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) )$ term in Equation (4) tells us that JMVAE encourages the inference network for descriptions, $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } )$ , to be close to the average of the posteriors induced by each of the images ${ \\bf x } _ { n }$ associated with $\\mathbf { y } _ { i }$ . Since each $q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } )$ is close to a delta function (since there is little posterior uncertainty when conditioning on an image), we are essentially requiring that $q _ { \\phi } ( \\mathbf { z } | \\mathbf { y } _ { i } )$ cover the embeddings of each of these images. ", + "bbox": [ + 173, + 483, + 825, + 559 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "A.2 DETAILS ON THE MNIST-A DATASET ", + "text_level": 1, + "bbox": [ + 176, + 575, + 478, + 590 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "We created the MNIST-A dataset as follows. Given an image in the original MNIST dataset, we first sample a discrete scale label (big or small), an orientation label (clockwise, upright, and anticlockwise), and a location label (top-left, top-right, bottom-left, bottom-right). ", + "bbox": [ + 174, + 601, + 826, + 643 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Next, we converted this vector of discrete attributes into a vector of continuous transformation parameters, using the procedure described below: ", + "bbox": [ + 173, + 651, + 823, + 679 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "• Scale: For big, we sample scale values from a Gaussian centered at 0.9 with a standard deviation of 0.1, while for small we sample from a Gaussian centered at 0.6 with a standard deviation of 0.1. In all cases, we reject and draw a sample again if we get values outside the range [0.4, 1.0], to avoid artifacts from upsampling or problems with illegible (small) digits. Orientation: For the clockwise label, we sample the amount of rotation to apply for a digit from a Gaussian centered at $+ 4 5$ degrees, with a standard deviation of 10 degrees. For anti-clockwise, we use a Gaussian at -45 degrees, with a standard deviation of 10 degrees. For upright, we set the rotation to be 0 degrees always. Location: For location, we place Gaussians at the centers of the four quadrants in the image, and then apply an offset of image_size/16 to shift the centers a bit towards the corresponding corners. We then use a standard deviation of image_size/16 and sample locations for centers of the digits. We reject and draw the sample again if we find that the location for the center would place the extremities of the digit outside of the canvas. ", + "bbox": [ + 215, + 693, + 826, + 882 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Finally, we generate the image as follows. We first take an empty black canvas of size $6 4 \\times 6 4$ , rotate the original $2 8 \\times 2 8$ MNIST image, and then scale and translate the image and paste it on the canvas. (We use bicubic interpolation for scaling and resizing the images.) Finally, we use the method of (Salakhutdinov & Murray, 2008) to binarize the images. See Figure 7 for example images generated in this way. ", + "bbox": [ + 174, + 895, + 825, + 924 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "", + "bbox": [ + 176, + 103, + 823, + 145 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "We repeat the above process of sampling labels, and applying corresponding transformations, to generate images 10 times for each image in the original MNIST dataset. Each trial samples labels from a uniform categorical distribution over the sample space for the corresponding attribute. Thus, we get a new MNIST-A dataset with 700,000 images from the original MNIST dataset of 70,000 images. We split the images into a train, val and test set of $85 \\%$ , $5 \\%$ , and $10 \\%$ of the data respectively to create the IID split. To create the compositional split, we split the $1 0 { \\times } 2 { \\times } 3 { \\times } 4 = 2 4 0$ possible label combinations by the sample train/val/test split, giving us splits of the dataset with non-overlapping label combinations. ", + "bbox": [ + 173, + 152, + 826, + 263 + ], + "page_idx": 14 + }, + { + "type": "image", + "img_path": "images/33f8b05ab8fce936e7f3835a7b292e98cde56931f9c9e1a8753bb9a2c64cf1a8.jpg", + "image_caption": [ + "Figure 7: Example binary images from our MNIST-A dataset. " + ], + "image_footnote": [], + "bbox": [ + 225, + 285, + 761, + 502 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "A.3 $\\beta$ -VAE vs.JOINT VAE ", + "text_level": 1, + "bbox": [ + 176, + 558, + 370, + 570 + ], + "page_idx": 14 + }, + { + "type": "image", + "img_path": "images/0af5e0e3d9ed36265cfe96b0d79354e35c4e4ec83bd117cfc12e8cf76c61b051.jpg", + "image_caption": [ + "Figure 8: Visualization of the benefit of semantic annotations for learning a good latent space. Each small digit is a single sample generated from $p ( x | z )$ from the corresponding point $z$ in latent space. (a) $\\beta$ -VAE fit to images without annotations. The color of a point $z$ is inferred from looking at the attributes of the training image that maps to this point of space using $q ( z | x )$ . Note that the red region (corresponding to the concept of large and even digits) is almost non existent. (b) Joint-VAE fit to images with annotations. The color of a point $z$ is inferred from $p ( y | z )$ . " + ], + "image_footnote": [], + "bbox": [ + 290, + 579, + 702, + 758 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "$\\beta$ -VAE Higgins et al. (2017a) is an approach that aims to learn disentangled latent spaces. It does this by modifying the ELBO objective, so that it scales the $\\mathrm { K L } ( q ( \\mathbf { z } | \\mathbf { x } ) , p ( \\mathbf { z } ) )$ term by a factor $\\beta > 1$ . This gives rise to disentangled spaces since the prior $p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\mathbf { 0 } , \\mathbf { I } )$ is factorized (see (Achille & Soatto, 2017) for details). However, to learn latent spaces that correspond to high level concepts, this is not sufficient: we need to use labeled data as well. ", + "bbox": [ + 174, + 853, + 825, + 924 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "To illustrate this, we set up an experiment where we learn a 2d latent space for standard MNIST digit images, but where we replace the label with two binary attributes: parity (odd vs.even) and magnitude (value $< 5$ or $> = 5$ ). We call this dataset MNIST-2bit. ", + "bbox": [ + 174, + 103, + 823, + 145 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "In Figure 8(a), we show the results of fitting a 2d $\\beta$ -VAE model (Higgins et al., 2017a) to the images in MNIST-2bit, ignoring the attributes. We perform a hyperparameter sweep over $\\beta$ , and pick the one that gives the best looking latent space (this corresponds to a value of $\\beta = 1 0$ ). At each point $z$ in the latent 2d space, we show a single image sampled from $p ( x | z )$ . To derive the colors for each point in latent space, we proceed as follows: we embed each training image $x$ (with label $y ( x ) )$ into latent space, by computing $\\hat { z } ( x ) = E _ { q ( z | x ) } [ z ]$ . We then associate label $y ( x )$ with this point in space. To derive the label for an arbitrary point $z$ , we lookup the closest embedded training image (using $\\ell _ { 2 }$ distance in $z$ space), and use its corresponding label. We see that the latent space is useful for autoencoding (since the generated images look good), but it does not capture the relevant semantic properties of parity and magnitude. In fact, we argue that there is no way of forcing the model to learn a latent space that captures such high level conceptual properties from images alone. ", + "bbox": [ + 174, + 152, + 825, + 305 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "In Figure 8(b), we show the results of fitting a joint VAE model to MNIST-2bit, by optimizing $\\mathrm { e l b o } ( x , y )$ on images and attributes (i.e., we do not include the uni-modality $\\operatorname { e l b o } ( x )$ and $\\operatorname { e l b o } ( y )$ terms in this experiment.) Now the color codes are derived from $p ( y | z )$ rather than using nearest neighbor retrieval. We see that the latent space autoencodes well, and also captures the 4 relevant types of concepts. In particular, the regions are all convex and linearly seperable, which facilitates the learning of a good imagination function $q ( z | y )$ , interpolation, retrieval, and other latent-space tasks. ", + "bbox": [ + 174, + 311, + 825, + 396 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "A skeptic might complain that we have created an arbitrary partitioning of the data, that is unrelated to the appearance of the objects, and that learning such concepts is therefore “unnatural”. But consider an agent interacting with an environment by touching digits on a screen. Suppose the amount of reward they get depends on whether the digit that they touch is small or big, or odd or even. In such an environment, it would be very useful for the agent to structure its internal representation to capture the concepts of magnitude and parity, rather than in terms of low level visual similarity. (In fact, (Scarf et al., 2011) showed that pigeons can learn simple numerical concepts, such as magnitude, by rewarding them for doing exactly this!) Language can be considered as the realization of such concepts, which enables agents to share useful information about their common environments more easily. ", + "bbox": [ + 173, + 404, + 825, + 541 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "A.4 DETAILS OF THE NEURAL NETWORK ARCHITECTURES ", + "text_level": 1, + "bbox": [ + 174, + 560, + 591, + 574 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "As explained in the main paper, we fit the joint graphical model $p ( x , y , z ) = p ( z ) p ( x | z ) p ( y | z )$ with inference networks $q ( z | x , y )$ , $q ( z | x )$ , and $q ( z | y )$ . Thus, our overall model is made up of three encoders (denoted with $q$ ) and two decoders (denoted with $p$ ). Across all models we use the exponential linear unit (ELU) which is a leaky non-linearity often used to train VAEs. We explain the architectures in more detail below. ", + "bbox": [ + 176, + 585, + 825, + 655 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "MNIST-A model architecture ", + "text_level": 1, + "bbox": [ + 174, + 662, + 379, + 676 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "• Image decoder, $p ( x | z )$ : Our architecture for the image decoder exactly follows the standard DCGAN architecture from (Radford et al., 2016), where the input to the model is the latent state of the VAE. ", + "bbox": [ + 217, + 690, + 823, + 732 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "• Label decoder, $p ( y | z )$ : Our label decoder assumes a factorized output space $p ( y | z ) =$ $\\textstyle \\prod _ { k \\in { \\mathcal { A } } } p ( y _ { k } | z )$ , where $y _ { k }$ is each individual attribute. We parameterize each $p ( y _ { k } | z )$ with a two-layer MLP with 128 hidden units each. We apply a small amount of $\\ell _ { 2 }$ regularization to the weight matrices. ", + "bbox": [ + 215, + 737, + 825, + 792 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "• Image and Label encoder, $q ( z | x , y )$ : Our architecture (Figure 9) for the image-label encoder first separately processes the images and the labels, and then concatenates them downstream in the network and then passes the concatenated features through a multi-layered perceptron. More specifically, we have convolutional layers which process image into 32, 64, 128, 16 feature maps with strides $1 , 2 , 2 , 2$ in the corresponding layers. We use batch normalization in the convolutional layers before applying the ELU non-linearity. On the label encoder side, we first encode the each attribute label into a 32d continuous vector and then pass each individual attribute vector through a 2-layered MLP with 512 hidden dimensions each. For example, for MNIST-A we have 4 attributes, which gives us 4 vectors of 512d. We then concatenate these vectors and pass it through a two layer MLP. Finally we concatenate this label feature with the image feature after the convolutional layers (after flattening the conv-features) and then pass the result through a 2 layer MLP to predict the mean $( \\mu )$ and standard deviation $( \\sigma )$ for the latent space gaussian. Following standard practice, we predict $\\log \\sigma$ for the standard deviation in order to get values which are positive. ", + "bbox": [ + 217, + 797, + 825, + 922 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "", + "bbox": [ + 232, + 103, + 825, + 174 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "µ \u0000 ", + "text_level": 1, + "bbox": [ + 462, + 191, + 532, + 215 + ], + "page_idx": 16 + }, + { + "type": "image", + "img_path": "images/3c8666b4b928e365d467fb0e5f9ee430477aaa538630478bba8cd6275380d78a.jpg", + "image_caption": [ + "Figure 9: Architecture for the $q ( z | x , y )$ network in our JVAE models for MNIST-A. Images are ( $6 4 \\times 6 4 \\times 1 )$ , class has 10 possible values, scale has 2 possible values, orientation has 3 possible values, and location has 4 possible values. " + ], + "image_footnote": [], + "bbox": [ + 204, + 215, + 794, + 472 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "• Image encoder, $q ( z | x )$ : The image encoder (Figure 10a) uses the same architecture to process the image as the image feature extractor in $q ( z | x , y )$ network described above. After the conv-features, we pass the result through a 3-layer MLP to get the latent state mean and standard deviation vectors following the procedure described above. ", + "bbox": [ + 215, + 559, + 825, + 614 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "• Label encoder, $q ( z | y )$ : The label encoder (Figure 10b) part of the architecture uses the same design choices to process the labels as the label encoder part in the $q ( z | x , y )$ network. After obtaining the concatenated label feature vectors, we pass the result through a 4-layered MLP with 512 hidden dimensions each and then finally obtain the mean $( \\mu )$ and $\\log \\sigma$ values for each dimension in the latent state of the VAE. ", + "bbox": [ + 215, + 622, + 825, + 691 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "MNIST-A Observation Classifier Model We next describe the architecuture of the observation classifier we use for evaluating the 3C’s on the MNIST-A dataset. The observation classifier is a convolutional neural network, with the first convolutional layer with filters of size $5 \\times 5$ , and 32 channels, followed by a $2 \\times 2$ pooling layer applied with a stride of 2. This is followed by another convolutional layer with $5 \\times 5$ filter size and 64 output channels. This is followed by another $2 \\times 2$ pooling layer of stride 2. After this, the network has four heads (corresponding to each attribute), each of which is an MLP with a single hidden layer (of size 1024), with dropout applied to the activations. The final layer of the MLP outputs the logits for classifying each attribute into the corresponding categorical labels associated with it. We train this model from scratch on the MNIST-A dataset using stochastic gradient descent, batch size of 64 and a learning rate of $1 0 ^ { - 4 }$ . ", + "bbox": [ + 173, + 708, + 825, + 847 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "CelebA model architecture Our design choices for CelebA closely mirror the models we built for MNIST-A. One primary difference is that we use a latent dimensionality of 18 in our CelebA experiments which matches the number of attributes we model. Meanwhile, the architectures of the image encoder, image decoder (i.e.DCGAN), are exactly identical to what is described above for MNIST-A execept that encoders take as input a 3-channel RGB image, while decoders produce a ", + "bbox": [ + 174, + 854, + 825, + 924 + ], + "page_idx": 16 + }, + { + "type": "image", + "img_path": "images/9e12d7fa6e49bc69072418dfb93ff708face4629172583c460b31e4c20242522.jpg", + "image_caption": [ + "Figure 10: Archtectures for the single input inference networks for MNIST-A. " + ], + "image_footnote": [], + "bbox": [ + 210, + 103, + 787, + 477 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "3-channel output. We replace the Bernoulli likelihood with Quantized Normal likelihood (which is basically gaussian likelihood with uniform noise). ", + "bbox": [ + 173, + 530, + 825, + 558 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "In terms of the label encoder $q ( z | y )$ , we follow Figure 10b quite closely, except that we get as input 18 categorical (embedded) class labels as input, and we process the labels through a single hidden layer before concatenation and two hidden layers post concatenation (as opposed to two and four used in Figure 10b). ", + "bbox": [ + 174, + 564, + 825, + 621 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Finally, the joint encoder $q ( z | x , y )$ , is again based heavily on Figure 9 where we feed as input 18 labels as opposed to 4, process them through a single layer mlp of 512d, concatenate them, and then pass the result through a two hidden layer mlp of $5 1 2 \\mathrm { d }$ . At this point we concatenate the result with the image feature through the image feature head in Figure 9. Finally, we process the feature through another 512d single hidden layer mlp to produce the $\\mu , \\sigma$ values. ", + "bbox": [ + 174, + 627, + 825, + 698 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "A.5 OUTPUTS OF OBSERVATION CLASSIFIER ON GENERATED IMAGES ", + "text_level": 1, + "bbox": [ + 176, + 720, + 663, + 734 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Figure 11 shows some images sampled from our TELBO model trained on MNIST-A. It also shows the attributes that are predicted by the attribute classifier. We see that the classifier often produces reasonable results that we as humans would also agree with. Thus, it acts as a reasonable proxy for humans classifying the labels for the generated images. ", + "bbox": [ + 173, + 747, + 825, + 804 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "A.6 HYPERPARAMTER CHOICES FOR TELBO, JMVAE, BIVCCA ON MNIST-A ", + "text_level": 1, + "bbox": [ + 176, + 825, + 741, + 840 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "We discuss more hyperparameter choices for the different objectives and how they impact performance on the MNIST-A dataset. Across all the objectives we set $\\lambda _ { x } { = } 1$ , and vary $\\lambda _ { y }$ . In addition, we also discuss how the private hyperparamter choices for each loss, $\\gamma$ for TELBO, $\\alpha$ for JMVAE, as in Wang et al. (2016a)) and $\\mu$ for BiVCCA affect performance. We use the JS-overall metric for picking hyperparameters, as explained in the main paper. ", + "bbox": [ + 174, + 853, + 825, + 924 + ], + "page_idx": 17 + }, + { + "type": "image", + "img_path": "images/cde83191ec4daa6010cc90c7a347bfde0d62bb6512dfca0f4e7d11dc7eb652b3.jpg", + "image_caption": [ + "Figure 11: Randomly sampled images from the TELBO model when fed randomly sampled concepts from the iid training set. We also show the outputs of the observation classifier for the images. Note that we visualize mean images above (since they tend to be more human interpretable) but the classifier is fed samples from the model. Figure best viewed by zooming in. " + ], + "image_footnote": [], + "bbox": [ + 218, + 209, + 774, + 762 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Query: 6, small, clockwise, bottom-right ", + "bbox": [ + 178, + 107, + 436, + 119 + ], + "page_idx": 19 + }, + { + "type": "image", + "img_path": "images/fefa3f8d74de211cd7f7d83aeb79bb43beef5def80d74fb90dfdbd1002ae226b.jpg", + "image_caption": [ + "Figure 12: Compositional generalization on MNIST-A. Models are given the unseen compositional query shown at the top and each of the three columns shows the mean of the image distribution generated by the models. Images marked with a red box are those that the observation classifier detected as being incorrect. We also show the classification result from the observation classifier on top of each image. We see that TELBO and JMVAE both do really well, while BiVCCA is substantially poorer. " + ], + "image_footnote": [], + "bbox": [ + 176, + 121, + 820, + 251 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "1. Effect of $\\lambda _ { y }$ : We search for $\\lambda _ { y }$ values in the set $\\{ 1 , 5 0 , 1 0 0 \\}$ for all objectives. In general, we find the setting of $\\lambda _ { y }$ in the elbo terms to be critical for good performance (especially on correctness). For example, at $\\lambda _ { y } { = } 1$ , we find that correctness numbers for the best performing TELBO model drop to 60.47 $( \\pm 0 . 3 4 )$ (from 82.08 $( \\pm 0 . 5 6 )$ at $\\lambda _ { y } = 5 0$ ) on the validation set for iid queries. Similar trends can be observed for the JMVAE and BiVCCA objectives as well (with $\\lambda _ { y } = 1 0$ being the best setting for BiVCCA, $\\lambda _ { y } = 5 0$ for JMVAE). We have seen qualitative evidence which shows that the likelihood scaling for $\\lambda _ { y }$ affects how disentangled the latent space is along the specified attributes. When the latent space is not grouped or organized as per high-level attributes (see Figure 8 for example), the posterior distribution for a given concept is multimodal, which is hard for a gaussian inference network $q ( \\mathbf { z } | \\mathbf { y } )$ to capture. This leads to poor correctness values. ", + "bbox": [ + 214, + 381, + 825, + 534 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "2. Effect of $\\gamma$ : In addition to the $\\lambda _ { y }$ scaling term which is common across all objectives, TELBO has a $\\gamma$ scaling factor which controls how we scale the $\\log p ( y | z )$ term in the $\\mathrm { e l b o } _ { \\gamma , 1 } ( \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } )$ term. We sweep values of $\\{ 1 , 5 0 , 1 0 0 \\}$ for this parameter. In general, we find that the effect of this term is smaller on the performance than the $\\lambda _ { y }$ term. Based on the setting of this parameter, we find that, for example, the correctness values for fully specified queries change from 82.08 $( \\pm 0 . 5 6 )$ at $\\gamma { = } 5 0$ to 80.27 $( \\pm 0 . 3 8 )$ at $\\gamma { = } 1$ on validation set for iid queries. ", + "bbox": [ + 214, + 541, + 825, + 638 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "3. Effect of $\\alpha$ : We generally find that $\\alpha { = } 1 . 0$ works best for JMVAE across the different choices explored in Wang et al. (2016a), namely, $\\{ 0 . 0 1 , 0 . 1 , 1 . 0 \\}$ . For example, decreasing the value of $\\alpha$ to 0.1 or 0.01 reduces correctness for fully sepcified queries from 85.63 $( \\pm 0 . 2 9 )$ t o 77.58 $( \\pm 0 . 2 3 )$ at 0.1 and 74.57 $( \\pm 0 . 4 4 )$ at 0.01 respectively on the validation set for iid queries. ", + "bbox": [ + 214, + 645, + 825, + 715 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "4. Effect of $\\mu$ : For BiVCCA, we ran a search for $\\mu$ over $\\{ 0 . 3 , 0 . 5 , 0 . 7 \\}$ , running each training experiment four times, and picked the best hyperparameter choice across the runs. We found that $\\mu { = } 0 . 7$ was the best value, however the performance difference across different choices was not very large. Intuitively, higher values of $\\mu$ should lead to improved performance compared to lower values of $\\mu$ . This is because lower values of $\\mu$ mean that we put more weight on the elbo term with a $q ( \\mathbf { z } | \\mathbf { x } )$ inference network than the one with a $q ( \\mathbf { z } | \\mathbf { y } )$ inference network, which results in sharper samples. ", + "bbox": [ + 214, + 722, + 825, + 820 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "A.7 COMPOSITIONAL GENRALIZATION ON MNIST-A: QUALITATIVE RESULTS AND DETAILS ", + "text_level": 1, + "bbox": [ + 174, + 840, + 821, + 854 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "We next show some examples of compositional generalization on MNIST-A on a validation set of queries. For the compositinal experiments we reused the parameters of the best models on the iid splits for all the models, and trained the models for $\\sim 1 6 0 K$ iterations. All other design choices were the same. Figure 12 shows some qualitative results. ", + "bbox": [ + 174, + 867, + 823, + 924 + ], + "page_idx": 19 + }, + { + "type": "image", + "img_path": "images/8cf44736649a82d0dee93d3dd6407bf1e6b14acd4091e65573ebad1c27c4069d.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 178, + 102, + 821, + 169 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Figure 13: Set of all 9 images labelled as bald ${ } = 1$ and $\\mathtt { m a l e = 0 }$ in the CelebA dataset. We can see that in all the cases the labels are inaccurate for the image, probably due to annotator error. ", + "bbox": [ + 171, + 195, + 823, + 222 + ], + "page_idx": 20 + }, + { + "type": "image", + "img_path": "images/88f1a8db5dd48aabca30b221c9b09a1011be7beaee7d5f327fd0b1494f8e613a.jpg", + "image_caption": [ + "Figure 14: TELBO creates more diverse images than JMVAE. At the top we show the set of attributes which are present and absent in the input query. Below, we show the results of generation with all the attributes specified, drawing 10 samples each. We see that both TELBO and JMVAE create accurate images satisfying the constraints. Note that the concept “male” is set to “absent” in the query, which in CelebA means that “female” is present. Next, we unspecify whether the image should contain a male or a female. We see that in this setting, TELBO has a better mixing of male and female images (fourth, sixth, eighth and ninth images in the third row are male), than JMVAE which just produces a single male image (the ninth image in the fourth row). " + ], + "image_footnote": [], + "bbox": [ + 308, + 247, + 684, + 401 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "A.8 DETAILS ON CELEBA ", + "text_level": 1, + "bbox": [ + 176, + 539, + 367, + 553 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "CelebA consists of 202,599 face colored images and 40 attribute binary vectors. We use the version of this dataset that was used in (Perarnau et al., 2016); this uses a subset of 18 visually distinctive attributes, and preprocesses each image so they are aligned, cropped, and scaled down to $6 4 \\times 6 4$ . We use the official train and test partitions, 182K for training and 20K for testing. Note that this is an iid split, so the attribute vectors in the test set all occur in the training set, even though the images and people are unique. In total, the original dataset with 40 attributes specified a set of 96486 unique visual concepts, while our dataset of 18 attributes spans 3690 different visual concepts. ", + "bbox": [ + 174, + 568, + 825, + 666 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "In Section 5.2, we claim that our generations of “Bald” and “Female” images are from a compositionally novel concept. Our claim comes with a minor caveat/clarification: the concept $\\mathtt { b a l d } { = } 1$ and $\\mathtt { m a l e = 0 }$ does occur in 9 training examples, but they are all incorrect labelings, as shown in Figure 13! Further, we see that the images generated from our model (shown in Figure 5) are qualitatively very different from any of the images here, showing that the model has not memorized these examples. ", + "bbox": [ + 174, + 672, + 825, + 742 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "A.9 MORE RESULTS ON CELEBA ", + "text_level": 1, + "bbox": [ + 176, + 767, + 415, + 781 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Finally, we show further qualitative examples of performance on the CelebA dataset. We focus on the TELBO and JMVAE objectives here, since BiVCCA generally produces poor samples (see Figure 5). Figure 14 (middle) shows some example generations for the concept specified by the attributes (top). We see that both TELBO and JMVAE produce correct images when provided the full attribute queries (first two rows). However, when we stop specifying attribute “male” or “not male” (female), we see that TELBO provides more diverse samples, spanning both male and female (compared to JMVAE). This ties into the explanation in Appendix A.1, where we show how one can interpret JMVAE as optimizing for the $\\bar { \\mathrm { K L } } ( q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) | \\bar { q } _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) )$ to fit the unimodal inference network $q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } )$ . Since JMVAE only reasons about the “aggregate” posterior as opposed to the prior (which TELBO reasons about), it has the tendency to generate less diverse samples when shown unseen concepts. 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This allows us to specify an exponentially large set of concepts using a compact, combinatorial", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 104, + 576, + 506, + 590 + ], + "spans": [ + { + "bbox": [ + 104, + 576, + 506, + 590 + ], + "score": 1.0, + "content": "representation. In particular, by specifying different subsets of attributes, we can generate concepts", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 587, + 505, + 600 + ], + "spans": [ + { + "bbox": [ + 105, + 587, + 505, + 600 + ], + "score": 1.0, + "content": "at different levels of granularity or abstraction. We can arrange these concepts into a compositional", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 599, + 505, + 610 + ], + "spans": [ + { + "bbox": [ + 106, + 599, + 505, + 610 + ], + "score": 1.0, + "content": "abstraction hierarchy, as shown in Figure 1. This is a directed acyclic graph (DAG) in which nodes", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 609, + 505, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 609, + 505, + 622 + ], + "score": 1.0, + "content": "represent concepts, and an edge from a node to its parent is added whenever we drop one of the", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 620, + 505, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 620, + 505, + 632 + ], + "score": 1.0, + "content": "attributes from the child’s concept definition. Note that we dont make any assumptions about the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 631, + 505, + 644 + ], + "spans": [ + { + "bbox": [ + 105, + 631, + 505, + 644 + ], + "score": 1.0, + "content": "order in which the attributes are dropped (that is, dropping the attribute “smiling” is just as valid as", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 641, + 505, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 641, + 505, + 654 + ], + "score": 1.0, + "content": "dropping “female” in Figure 1). Thus, the tree shown in the figure is just a subset extracted from the", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 652, + 325, + 666 + ], + "spans": [ + { + "bbox": [ + 105, + 652, + 325, + 666 + ], + "score": 1.0, + "content": "full DAG of concepts, shown for illustration purposes.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 41.5 + }, + { + "type": "text", + "bbox": [ + 107, + 670, + 505, + 715 + ], + "lines": [ + { + "bbox": [ + 105, + 669, + 506, + 682 + ], + "spans": [ + { + "bbox": [ + 105, + 669, + 336, + 682 + ], + "score": 1.0, + "content": "We can describe a concept by creating the attribute vector", + "type": "text" + }, + { + "bbox": [ + 336, + 672, + 350, + 681 + ], + "score": 0.84, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 669, + 506, + 682 + ], + "score": 1.0, + "content": ", in which we only specify the value of", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 681, + 505, + 692 + ], + "spans": [ + { + "bbox": [ + 106, + 682, + 208, + 692 + ], + "score": 1.0, + "content": "the attributes in the subset", + "type": "text" + }, + { + "bbox": [ + 209, + 681, + 239, + 692 + ], + "score": 0.9, + "content": "\\mathcal { O } \\subseteq A", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 682, + 505, + 692 + ], + "score": 1.0, + "content": "; the remaining attributes are unspecified, and are assumed to take all", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 692, + 506, + 704 + ], + "spans": [ + { + "bbox": [ + 105, + 692, + 506, + 704 + ], + "score": 1.0, + "content": "possible legal values. 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Our method", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 141, + 317, + 470, + 328 + ], + "spans": [ + { + "bbox": [ + 141, + 317, + 470, + 328 + ], + "score": 1.0, + "content": "uses a novel training objective, and a novel product-of-experts inference network,", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 141, + 327, + 470, + 340 + ], + "spans": [ + { + "bbox": [ + 141, + 327, + 470, + 340 + ], + "score": 1.0, + "content": "which can handle partially specified (abstract) concepts in a principled and efficient", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 141, + 338, + 469, + 351 + ], + "spans": [ + { + "bbox": [ + 141, + 338, + 469, + 351 + ], + "score": 1.0, + "content": "way. We also propose a set of easy-to-compute evaluation metrics that capture", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 141, + 349, + 469, + 361 + ], + "spans": [ + { + "bbox": [ + 141, + 349, + 469, + 361 + ], + "score": 1.0, + "content": "our intuitive notions of what it means to have good visual imagination, namely", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 141, + 360, + 470, + 372 + ], + "spans": [ + { + "bbox": [ + 141, + 361, + 344, + 372 + ], + "score": 1.0, + "content": "correctness, coverage, and compositionality (the", + "type": "text" + }, + { + "bbox": [ + 344, + 360, + 368, + 370 + ], + "score": 0.7, + "content": "3 \\ : C ' s", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 361, + 470, + 372 + ], + "score": 1.0, + "content": "). Finally, we perform a", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 141, + 370, + 470, + 383 + ], + "spans": [ + { + "bbox": [ + 141, + 370, + 470, + 383 + ], + "score": 1.0, + "content": "detailed comparison of our method with two existing joint image-attribute VAE", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 381, + 470, + 393 + ], + "spans": [ + { + "bbox": [ + 141, + 381, + 470, + 393 + ], + "score": 1.0, + "content": "methods (the JMVAE method of Suzuki et al. (2017) and the BiVCCA method of", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 392, + 470, + 405 + ], + "spans": [ + { + "bbox": [ + 141, + 392, + 470, + 405 + ], + "score": 1.0, + "content": "Wang et al. (2016b)) by applying them to two datasets: the MNIST-with-attributes", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 141, + 403, + 449, + 415 + ], + "spans": [ + { + "bbox": [ + 141, + 403, + 449, + 415 + ], + "score": 1.0, + "content": "dataset (which we introduce here), and the CelebA dataset (Liu et al., 2015).", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 21, + "bbox_fs": [ + 141, + 272, + 470, + 415 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 435, + 206, + 448 + ], + "lines": [ + { + "bbox": [ + 105, + 434, + 208, + 451 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 208, + 451 + ], + "score": 1.0, + "content": "1 INTRODUCTION", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 460, + 505, + 549 + ], + "lines": [ + { + "bbox": [ + 105, + 460, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 472, + 473 + ], + "score": 1.0, + "content": "Consider the following two-party communication game: a speaker thinks of a visual concept", + "type": "text" + }, + { + "bbox": [ + 472, + 461, + 481, + 471 + ], + "score": 0.78, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 481, + 460, + 506, + 473 + ], + "score": 1.0, + "content": ", such", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 472, + 505, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 349, + 484 + ], + "score": 1.0, + "content": "as “men with black hair”, and then generates a description", + "type": "text" + }, + { + "bbox": [ + 349, + 474, + 357, + 483 + ], + "score": 0.41, + "content": "\\mathbf { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 472, + 505, + 484 + ], + "score": 1.0, + "content": "of this concept, which she sends to", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 482, + 505, + 495 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 467, + 495 + ], + "score": 1.0, + "content": "a listener; the listener interprets the description y, by creating an internal representation", + "type": "text" + }, + { + "bbox": [ + 467, + 485, + 474, + 493 + ], + "score": 0.51, + "content": "\\mathbf { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 482, + 505, + 495 + ], + "score": 1.0, + "content": ", which", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 494, + 505, + 506 + ], + "spans": [ + { + "bbox": [ + 105, + 494, + 267, + 506 + ], + "score": 1.0, + "content": "captures its “meaning”. We can think of", + "type": "text" + }, + { + "bbox": [ + 268, + 496, + 274, + 504 + ], + "score": 0.68, + "content": "\\mathbf { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 494, + 505, + 506 + ], + "score": 1.0, + "content": "as representing a set of “mental images” which depict the", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 505, + 505, + 516 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 140, + 516 + ], + "score": 1.0, + "content": "concept", + "type": "text" + }, + { + "bbox": [ + 140, + 505, + 149, + 514 + ], + "score": 0.79, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 150, + 505, + 505, + 516 + ], + "score": 1.0, + "content": ". To test whether the listener has correctly “understood” the concept, we ask him to draw", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 515, + 506, + 529 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 188, + 529 + ], + "score": 1.0, + "content": "a set of real images", + "type": "text" + }, + { + "bbox": [ + 188, + 515, + 278, + 528 + ], + "score": 0.92, + "content": "S = \\{ \\mathbf { x } _ { s } : s = 1 : S \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 278, + 515, + 386, + 529 + ], + "score": 1.0, + "content": ", which depict the concept", + "type": "text" + }, + { + "bbox": [ + 387, + 516, + 395, + 525 + ], + "score": 0.73, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 515, + 506, + 529 + ], + "score": 1.0, + "content": ". He then sends these back", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 527, + 505, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 409, + 539 + ], + "score": 1.0, + "content": "to the speaker, who checks to see if the images correctly match the concept", + "type": "text" + }, + { + "bbox": [ + 410, + 527, + 419, + 536 + ], + "score": 0.76, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 527, + 505, + 539 + ], + "score": 1.0, + "content": ". We call this process", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 538, + 234, + 550 + ], + "spans": [ + { + "bbox": [ + 106, + 538, + 234, + 550 + ], + "score": 1.0, + "content": "visually grounded imagination.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 32.5, + "bbox_fs": [ + 105, + 460, + 506, + 550 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 554, + 505, + 664 + ], + "lines": [ + { + "bbox": [ + 105, + 554, + 505, + 567 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 505, + 567 + ], + "score": 1.0, + "content": "In this paper, we represent concept descriptions in terms of a fixed length vector of discrete attributes", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 107, + 564, + 505, + 578 + ], + "spans": [ + { + "bbox": [ + 107, + 566, + 116, + 575 + ], + "score": 0.64, + "content": "\\mathcal { A }", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 564, + 505, + 578 + ], + "score": 1.0, + "content": ". This allows us to specify an exponentially large set of concepts using a compact, combinatorial", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 104, + 576, + 506, + 590 + ], + "spans": [ + { + "bbox": [ + 104, + 576, + 506, + 590 + ], + "score": 1.0, + "content": "representation. In particular, by specifying different subsets of attributes, we can generate concepts", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 587, + 505, + 600 + ], + "spans": [ + { + "bbox": [ + 105, + 587, + 505, + 600 + ], + "score": 1.0, + "content": "at different levels of granularity or abstraction. We can arrange these concepts into a compositional", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 599, + 505, + 610 + ], + "spans": [ + { + "bbox": [ + 106, + 599, + 505, + 610 + ], + "score": 1.0, + "content": "abstraction hierarchy, as shown in Figure 1. This is a directed acyclic graph (DAG) in which nodes", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 609, + 505, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 609, + 505, + 622 + ], + "score": 1.0, + "content": "represent concepts, and an edge from a node to its parent is added whenever we drop one of the", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 620, + 505, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 620, + 505, + 632 + ], + "score": 1.0, + "content": "attributes from the child’s concept definition. Note that we dont make any assumptions about the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 631, + 505, + 644 + ], + "spans": [ + { + "bbox": [ + 105, + 631, + 505, + 644 + ], + "score": 1.0, + "content": "order in which the attributes are dropped (that is, dropping the attribute “smiling” is just as valid as", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 641, + 505, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 641, + 505, + 654 + ], + "score": 1.0, + "content": "dropping “female” in Figure 1). Thus, the tree shown in the figure is just a subset extracted from the", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 652, + 325, + 666 + ], + "spans": [ + { + "bbox": [ + 105, + 652, + 325, + 666 + ], + "score": 1.0, + "content": "full DAG of concepts, shown for illustration purposes.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 41.5, + "bbox_fs": [ + 104, + 554, + 506, + 666 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 670, + 505, + 715 + ], + "lines": [ + { + "bbox": [ + 105, + 669, + 506, + 682 + ], + "spans": [ + { + "bbox": [ + 105, + 669, + 336, + 682 + ], + "score": 1.0, + "content": "We can describe a concept by creating the attribute vector", + "type": "text" + }, + { + "bbox": [ + 336, + 672, + 350, + 681 + ], + "score": 0.84, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 669, + 506, + 682 + ], + "score": 1.0, + "content": ", in which we only specify the value of", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 681, + 505, + 692 + ], + "spans": [ + { + "bbox": [ + 106, + 682, + 208, + 692 + ], + "score": 1.0, + "content": "the attributes in the subset", + "type": "text" + }, + { + "bbox": [ + 209, + 681, + 239, + 692 + ], + "score": 0.9, + "content": "\\mathcal { O } \\subseteq A", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 682, + 505, + 692 + ], + "score": 1.0, + "content": "; the remaining attributes are unspecified, and are assumed to take all", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 692, + 506, + 704 + ], + "spans": [ + { + "bbox": [ + 105, + 692, + 506, + 704 + ], + "score": 1.0, + "content": "possible legal values. For example, consider the following concepts, in order of increasing abstraction:", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 107, + 703, + 507, + 716 + ], + "spans": [ + { + "bbox": [ + 107, + 703, + 141, + 714 + ], + "score": 0.82, + "content": "C _ { m s b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 703, + 255, + 716 + ], + "score": 1.0, + "content": "(male, smiling, blackhair),", + "type": "text" + }, + { + "bbox": [ + 255, + 703, + 297, + 715 + ], + "score": 0.39, + "content": "C _ { * s b } = ( *", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 703, + 402, + 716 + ], + "score": 1.0, + "content": ", smiling, blackhair), and", + "type": "text" + }, + { + "bbox": [ + 402, + 703, + 502, + 715 + ], + "score": 0.73, + "content": "C _ { * * b } = ( * , * , \\mathrm { b l a c k h a i r } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 703, + 507, + 716 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 369, + 95 + ], + "score": 1.0, + "content": "where the attributes are gender, smiling or not, and hair color, and", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 369, + 84, + 376, + 92 + ], + "score": 0.76, + "content": "^ *", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 376, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "represents “don’t care”. A good", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 505, + 105 + ], + "score": 1.0, + "content": "model should be able to generate images from different levels of the abstraction hierarchy, as shown", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "in Figure 1. (This is in contrast to most prior work on conditional generative models of images, which", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "score": 1.0, + "content": "assume that all attributes are fully specified, which corresponds to sampling only from leaf nodes in", + "type": "text", + "cross_page": true + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 125, + 166, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 125, + 166, + 139 + ], + "score": 1.0, + "content": "the hierarchy.)", + "type": "text", + "cross_page": true + } + ], + "index": 4 + } + ], + "index": 48.5, + "bbox_fs": [ + 105, + 669, + 507, + 716 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 138 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 369, + 95 + ], + "score": 1.0, + "content": "where the attributes are gender, smiling or not, and hair color, and", + "type": "text" + }, + { + "bbox": [ + 369, + 84, + 376, + 92 + ], + "score": 0.76, + "content": "^ *", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "represents “don’t care”. A good", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 505, + 105 + ], + "score": 1.0, + "content": "model should be able to generate images from different levels of the abstraction hierarchy, as shown", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "in Figure 1. (This is in contrast to most prior work on conditional generative models of images, which", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "score": 1.0, + "content": "assume that all attributes are fully specified, which corresponds to sampling only from leaf nodes in", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 125, + 166, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 125, + 166, + 139 + ], + "score": 1.0, + "content": "the hierarchy.)", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2 + }, + { + "type": "image", + "bbox": [ + 192, + 162, + 417, + 272 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 192, + 162, + 417, + 272 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 192, + 162, + 417, + 272 + ], + "spans": [ + { + "bbox": [ + 192, + 162, + 417, + 272 + ], + "score": 0.97, + "type": "image", + "image_path": "df5ae9ce9cf733cf7373f02ab07cee5213fc9e1882dff1aa502a1f29fdf95c60.jpg" + } + ] + } + ], + "index": 8.5, + "virtual_lines": [ + { + "bbox": [ + 192, + 162, + 417, + 175.75 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 192, + 175.75, + 417, + 189.5 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 192, + 189.5, + 417, + 203.25 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 192, + 203.25, + 417, + 217.0 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 192, + 217.0, + 417, + 230.75 + ], + "spans": [], + "index": 9 + }, + { + "bbox": [ + 192, + 230.75, + 417, + 244.5 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 192, + 244.5, + 417, + 258.25 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 192, + 258.25, + 417, + 272.0 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 285, + 504, + 315 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 284, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 106, + 284, + 506, + 297 + ], + "score": 1.0, + "content": "Figure 1: A compositional abstraction hierarchy for faces, derived from 3 attributes: hair color, smiling or not,", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 294, + 506, + 306 + ], + "spans": [ + { + "bbox": [ + 106, + 294, + 506, + 306 + ], + "score": 1.0, + "content": "and gender. We show a set of sample images generated by our model, when trained on CelebA, for different", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 305, + 192, + 316 + ], + "spans": [ + { + "bbox": [ + 106, + 305, + 192, + 316 + ], + "score": 1.0, + "content": "nodes in this hierarchy.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14 + } + ], + "index": 11.25 + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 505, + 403 + ], + "lines": [ + { + "bbox": [ + 105, + 323, + 506, + 336 + ], + "spans": [ + { + "bbox": [ + 105, + 323, + 506, + 336 + ], + "score": 1.0, + "content": "In Section 2, we show how we can extend the variational autoencoder (VAE) framework of Kingma", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "score": 1.0, + "content": "& Welling (2014) to create models which can perform this task. The first extension is to modify the", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "score": 1.0, + "content": "model to the “multi-modal” setting where we have both an image, x, and an attribute vector, y. More", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 357, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 357, + 347, + 370 + ], + "score": 1.0, + "content": "precisely, we assume a joint generative model of the form", + "type": "text" + }, + { + "bbox": [ + 348, + 357, + 474, + 369 + ], + "score": 0.9, + "content": "\\begin{array} { r } { p ( \\mathbf { x } , \\mathbf { y } , \\mathbf { z } ) = p ( \\mathbf { z } ) p ( \\mathbf { x } | \\mathbf { z } ) p ( \\mathbf { y } | \\mathbf { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 474, + 357, + 505, + 370 + ], + "score": 1.0, + "content": ", where", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 367, + 505, + 381 + ], + "spans": [ + { + "bbox": [ + 106, + 368, + 126, + 380 + ], + "score": 0.91, + "content": "p ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 367, + 263, + 381 + ], + "score": 1.0, + "content": "is the prior over the latent variable", + "type": "text" + }, + { + "bbox": [ + 263, + 370, + 270, + 378 + ], + "score": 0.47, + "content": "\\mathbf { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 367, + 273, + 381 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 273, + 368, + 301, + 380 + ], + "score": 0.91, + "content": "p ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 367, + 405, + 381 + ], + "score": 1.0, + "content": "is our image decoder, and", + "type": "text" + }, + { + "bbox": [ + 406, + 369, + 433, + 380 + ], + "score": 0.91, + "content": "p ( \\mathbf { y } \\vert \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 433, + 367, + 505, + 381 + ], + "score": 1.0, + "content": "is our description", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 379, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 106, + 379, + 505, + 391 + ], + "score": 1.0, + "content": "decoder. We additionally assume that the description decoder factorizes over the specified attributes", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 389, + 302, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 192, + 404 + ], + "score": 1.0, + "content": "in the description, so", + "type": "text" + }, + { + "bbox": [ + 192, + 389, + 298, + 403 + ], + "score": 0.92, + "content": "\\begin{array} { r } { p ( \\mathbf { \\dot { y } } _ { \\mathcal { O } } | \\mathbf { z } ) = \\prod _ { k \\in \\mathcal { O } } p ( y _ { k } | \\mathbf { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 389, + 302, + 404 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 19 + }, + { + "type": "text", + "bbox": [ + 106, + 406, + 505, + 474 + ], + "lines": [ + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "score": 1.0, + "content": "We further extend the VAE by devising a novel objective function, which we call the TELBO, for", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 417, + 506, + 430 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 250, + 430 + ], + "score": 1.0, + "content": "training the model from paired data,", + "type": "text" + }, + { + "bbox": [ + 251, + 417, + 318, + 430 + ], + "score": 0.94, + "content": "\\bar { \\cal D } \\bar { \\bf \\Delta } = \\{ ( { \\bf x } _ { n } , { \\bf y } _ { n } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 417, + 506, + 430 + ], + "score": 1.0, + "content": ". However, at test time, we will allow unpaired", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 428, + 506, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 464, + 442 + ], + "score": 1.0, + "content": "data (either just a description or just an image). Hence we fit three inference networks:", + "type": "text" + }, + { + "bbox": [ + 464, + 429, + 502, + 441 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 428, + 506, + 442 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 439, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 107, + 440, + 134, + 451 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 134, + 439, + 153, + 452 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 153, + 440, + 181, + 451 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 439, + 506, + 452 + ], + "score": 1.0, + "content": ". This way we can embed an image or a description into the same shared latent", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 450, + 506, + 464 + ], + "spans": [ + { + "bbox": [ + 105, + 450, + 158, + 464 + ], + "score": 1.0, + "content": "space (using", + "type": "text" + }, + { + "bbox": [ + 158, + 451, + 185, + 462 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 450, + 203, + 464 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 203, + 451, + 231, + 462 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 450, + 506, + 464 + ], + "score": 1.0, + "content": ", respectively); this lets us “translate” images into descriptions or vice", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 461, + 446, + 475 + ], + "spans": [ + { + "bbox": [ + 106, + 462, + 190, + 475 + ], + "score": 1.0, + "content": "versa, by computing", + "type": "text" + }, + { + "bbox": [ + 190, + 461, + 307, + 474 + ], + "score": 0.92, + "content": "\\begin{array} { r } { p ( \\mathbf { y } | \\mathbf { x } ) = \\int d \\mathbf { z } \\ p ( \\mathbf { y } | \\mathbf { z } ) q ( \\mathbf { z } | \\mathbf { x } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 462, + 325, + 475 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 325, + 461, + 442, + 474 + ], + "score": 0.93, + "content": "\\begin{array} { r } { p ( \\mathbf { x } | \\mathbf { y } ) = \\int d \\mathbf { z } \\ p ( \\mathbf { x } | \\mathbf { z } ) q ( \\mathbf { z } | \\mathbf { y } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 462, + 446, + 475 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 25.5 + }, + { + "type": "text", + "bbox": [ + 107, + 478, + 505, + 545 + ], + "lines": [ + { + "bbox": [ + 105, + 477, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 506, + 491 + ], + "score": 1.0, + "content": "To handle abstract concepts (i.e., partially observed attribute vectors), we use a method based on the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 489, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 489, + 505, + 501 + ], + "score": 1.0, + "content": "product of experts (POE) (Hinton, 2002). In particular, our inference network for attributes has the", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 499, + 507, + 514 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 128, + 514 + ], + "score": 1.0, + "content": "form", + "type": "text" + }, + { + "bbox": [ + 128, + 500, + 255, + 513 + ], + "score": 0.92, + "content": "\\begin{array} { r } { q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) \\propto p ( \\mathbf { z } ) \\prod _ { k \\in \\mathcal { O } } q ( \\mathbf { z } | \\mathbf { y } _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 499, + 507, + 514 + ], + "score": 1.0, + "content": ". If no attributes are specified, the posterior is equal to the prior.", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 104, + 510, + 506, + 525 + ], + "spans": [ + { + "bbox": [ + 104, + 510, + 506, + 525 + ], + "score": 1.0, + "content": "As we condition on more attributes, the posterior becomes narrower, which corresponds to specifying", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 522, + 506, + 535 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 506, + 535 + ], + "score": 1.0, + "content": "a more precise concept. This enables us to generate a more diverse set of images to represent abstract", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 533, + 475, + 546 + ], + "spans": [ + { + "bbox": [ + 106, + 533, + 475, + 546 + ], + "score": 1.0, + "content": "concepts, and a less diverse set of images to represent concrete concepts, as we show below.", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 31.5 + }, + { + "type": "text", + "bbox": [ + 106, + 550, + 506, + 693 + ], + "lines": [ + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "score": 1.0, + "content": "Section 3 discusses how to evaluate the performance of our method in an objective way. Specifically,", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 561, + 506, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 363, + 574 + ], + "score": 1.0, + "content": "we first “ground” the description by generating a set of images,", + "type": "text" + }, + { + "bbox": [ + 363, + 561, + 506, + 573 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\mathcal { S } ( \\mathbf { y } _ { \\mathcal { O } } ) = \\{ \\mathbf { x } ^ { s } \\sim p ( \\mathbf { x } | \\mathbf { y } _ { \\mathcal { O } } ) : s = 1 : } \\end{array}", + "type": "inline_equation" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 570, + 504, + 586 + ], + "spans": [ + { + "bbox": [ + 106, + 572, + 119, + 584 + ], + "score": 0.86, + "content": "S \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 119, + 570, + 297, + 586 + ], + "score": 1.0, + "content": ". We then check that all the sampled images in", + "type": "text" + }, + { + "bbox": [ + 298, + 572, + 326, + 584 + ], + "score": 0.93, + "content": "\\scriptstyle { S ( \\mathbf { y } _ { \\mathcal { O } } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 570, + 489, + 586 + ], + "score": 1.0, + "content": "are consistent with the specified attributes", + "type": "text" + }, + { + "bbox": [ + 489, + 574, + 504, + 584 + ], + "score": 0.47, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "score": 1.0, + "content": "(we call this correctness). We also check that the set of images “spans” the extension of the concept,", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 595, + 505, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 595, + 505, + 606 + ], + "score": 1.0, + "content": "by exhibiting suitable diversity (c.f. (Young et al., 2014)). Concretely, we check that the attributes that", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 604, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 239, + 618 + ], + "score": 1.0, + "content": "were not specified (e.g., gender in", + "type": "text" + }, + { + "bbox": [ + 240, + 605, + 259, + 616 + ], + "score": 0.92, + "content": "C _ { * s b }", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 604, + 505, + 618 + ], + "score": 1.0, + "content": "above) vary across the different images; we call this coverage.", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 473, + 629 + ], + "score": 1.0, + "content": "Finally, we want the set of images to have high correctness and coverage even if the concept", + "type": "text" + }, + { + "bbox": [ + 474, + 617, + 488, + 628 + ], + "score": 0.81, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 615, + 505, + 629 + ], + "score": 1.0, + "content": "has", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "score": 1.0, + "content": "a combination of attribute values that have not been seen in training. For example, if we train on", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 107, + 637, + 506, + 651 + ], + "spans": [ + { + "bbox": [ + 107, + 638, + 143, + 649 + ], + "score": 0.74, + "content": "C _ { m s b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 637, + 276, + 651 + ], + "score": 1.0, + "content": "(male, smiling, blackhair), and", + "type": "text" + }, + { + "bbox": [ + 276, + 638, + 311, + 650 + ], + "score": 0.87, + "content": "{ C _ { f n b } = }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 637, + 506, + 651 + ], + "score": 1.0, + "content": "(female, notsmiling, blackhair), we should be", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 648, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 167, + 662 + ], + "score": 1.0, + "content": "able to test on", + "type": "text" + }, + { + "bbox": [ + 168, + 649, + 205, + 660 + ], + "score": 0.8, + "content": "C _ { m n b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 648, + 351, + 662 + ], + "score": 1.0, + "content": "(male, notsmiling, blackhair), and", + "type": "text" + }, + { + "bbox": [ + 352, + 649, + 385, + 661 + ], + "score": 0.85, + "content": "C _ { f s b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 648, + 506, + 662 + ], + "score": 1.0, + "content": "(female, smiling, blackhair).", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 104, + 659, + 506, + 674 + ], + "spans": [ + { + "bbox": [ + 104, + 659, + 506, + 674 + ], + "score": 1.0, + "content": "We will call this property compositionality. Being able to generate plausible images in response to", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 669, + 506, + 684 + ], + "spans": [ + { + "bbox": [ + 105, + 669, + 506, + 684 + ], + "score": 1.0, + "content": "truly compositionally novel queries is the essence of imagination. Together, we call these criteria the", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 104, + 681, + 219, + 695 + ], + "spans": [ + { + "bbox": [ + 104, + 681, + 219, + 695 + ], + "score": 1.0, + "content": "3 C’s of visual imagination.", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 107, + 699, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 698, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 711 + ], + "score": 1.0, + "content": "Section 5 reports experimental results on two different datasets. 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We show a set of sample images generated by our model, when trained on CelebA, for different", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 305, + 192, + 316 + ], + "spans": [ + { + "bbox": [ + 106, + 305, + 192, + 316 + ], + "score": 1.0, + "content": "nodes in this hierarchy.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14 + } + ], + "index": 11.25 + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 505, + 403 + ], + "lines": [ + { + "bbox": [ + 105, + 323, + 506, + 336 + ], + "spans": [ + { + "bbox": [ + 105, + 323, + 506, + 336 + ], + "score": 1.0, + "content": "In Section 2, we show how we can extend the variational autoencoder (VAE) framework of Kingma", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "score": 1.0, + "content": "& Welling (2014) to create models which can perform this task. The first extension is to modify the", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "score": 1.0, + "content": "model to the “multi-modal” setting where we have both an image, x, and an attribute vector, y. 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We additionally assume that the description decoder factorizes over the specified attributes", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 389, + 302, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 192, + 404 + ], + "score": 1.0, + "content": "in the description, so", + "type": "text" + }, + { + "bbox": [ + 192, + 389, + 298, + 403 + ], + "score": 0.92, + "content": "\\begin{array} { r } { p ( \\mathbf { \\dot { y } } _ { \\mathcal { O } } | \\mathbf { z } ) = \\prod _ { k \\in \\mathcal { O } } p ( y _ { k } | \\mathbf { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 389, + 302, + 404 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 19, + "bbox_fs": [ + 105, + 323, + 506, + 404 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 406, + 505, + 474 + ], + "lines": [ + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "score": 1.0, + "content": "We further extend the VAE by devising a novel objective function, which we call the TELBO, for", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 417, + 506, + 430 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 250, + 430 + ], + "score": 1.0, + "content": "training the model from paired data,", + "type": "text" + }, + { + "bbox": [ + 251, + 417, + 318, + 430 + ], + "score": 0.94, + "content": "\\bar { \\cal D } \\bar { \\bf \\Delta } = \\{ ( { \\bf x } _ { n } , { \\bf y } _ { n } ) \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 417, + 506, + 430 + ], + "score": 1.0, + "content": ". However, at test time, we will allow unpaired", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 428, + 506, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 464, + 442 + ], + "score": 1.0, + "content": "data (either just a description or just an image). Hence we fit three inference networks:", + "type": "text" + }, + { + "bbox": [ + 464, + 429, + 502, + 441 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 428, + 506, + 442 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 107, + 439, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 107, + 440, + 134, + 451 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 134, + 439, + 153, + 452 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 153, + 440, + 181, + 451 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 439, + 506, + 452 + ], + "score": 1.0, + "content": ". This way we can embed an image or a description into the same shared latent", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 450, + 506, + 464 + ], + "spans": [ + { + "bbox": [ + 105, + 450, + 158, + 464 + ], + "score": 1.0, + "content": "space (using", + "type": "text" + }, + { + "bbox": [ + 158, + 451, + 185, + 462 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 450, + 203, + 464 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 203, + 451, + 231, + 462 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 231, + 450, + 506, + 464 + ], + "score": 1.0, + "content": ", respectively); this lets us “translate” images into descriptions or vice", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 461, + 446, + 475 + ], + "spans": [ + { + "bbox": [ + 106, + 462, + 190, + 475 + ], + "score": 1.0, + "content": "versa, by computing", + "type": "text" + }, + { + "bbox": [ + 190, + 461, + 307, + 474 + ], + "score": 0.92, + "content": "\\begin{array} { r } { p ( \\mathbf { y } | \\mathbf { x } ) = \\int d \\mathbf { z } \\ p ( \\mathbf { y } | \\mathbf { z } ) q ( \\mathbf { z } | \\mathbf { x } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 307, + 462, + 325, + 475 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 325, + 461, + 442, + 474 + ], + "score": 0.93, + "content": "\\begin{array} { r } { p ( \\mathbf { x } | \\mathbf { y } ) = \\int d \\mathbf { z } \\ p ( \\mathbf { x } | \\mathbf { z } ) q ( \\mathbf { z } | \\mathbf { y } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 462, + 446, + 475 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 25.5, + "bbox_fs": [ + 105, + 406, + 506, + 475 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 478, + 505, + 545 + ], + "lines": [ + { + "bbox": [ + 105, + 477, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 506, + 491 + ], + "score": 1.0, + "content": "To handle abstract concepts (i.e., partially observed attribute vectors), we use a method based on the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 489, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 489, + 505, + 501 + ], + "score": 1.0, + "content": "product of experts (POE) (Hinton, 2002). In particular, our inference network for attributes has the", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 499, + 507, + 514 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 128, + 514 + ], + "score": 1.0, + "content": "form", + "type": "text" + }, + { + "bbox": [ + 128, + 500, + 255, + 513 + ], + "score": 0.92, + "content": "\\begin{array} { r } { q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) \\propto p ( \\mathbf { z } ) \\prod _ { k \\in \\mathcal { O } } q ( \\mathbf { z } | \\mathbf { y } _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 499, + 507, + 514 + ], + "score": 1.0, + "content": ". If no attributes are specified, the posterior is equal to the prior.", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 104, + 510, + 506, + 525 + ], + "spans": [ + { + "bbox": [ + 104, + 510, + 506, + 525 + ], + "score": 1.0, + "content": "As we condition on more attributes, the posterior becomes narrower, which corresponds to specifying", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 522, + 506, + 535 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 506, + 535 + ], + "score": 1.0, + "content": "a more precise concept. This enables us to generate a more diverse set of images to represent abstract", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 533, + 475, + 546 + ], + "spans": [ + { + "bbox": [ + 106, + 533, + 475, + 546 + ], + "score": 1.0, + "content": "concepts, and a less diverse set of images to represent concrete concepts, as we show below.", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 31.5, + "bbox_fs": [ + 104, + 477, + 507, + 546 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 550, + 506, + 693 + ], + "lines": [ + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "score": 1.0, + "content": "Section 3 discusses how to evaluate the performance of our method in an objective way. Specifically,", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 561, + 506, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 363, + 574 + ], + "score": 1.0, + "content": "we first “ground” the description by generating a set of images,", + "type": "text" + }, + { + "bbox": [ + 363, + 561, + 506, + 573 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\mathcal { S } ( \\mathbf { y } _ { \\mathcal { O } } ) = \\{ \\mathbf { x } ^ { s } \\sim p ( \\mathbf { x } | \\mathbf { y } _ { \\mathcal { O } } ) : s = 1 : } \\end{array}", + "type": "inline_equation" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 570, + 504, + 586 + ], + "spans": [ + { + "bbox": [ + 106, + 572, + 119, + 584 + ], + "score": 0.86, + "content": "S \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 119, + 570, + 297, + 586 + ], + "score": 1.0, + "content": ". We then check that all the sampled images in", + "type": "text" + }, + { + "bbox": [ + 298, + 572, + 326, + 584 + ], + "score": 0.93, + "content": "\\scriptstyle { S ( \\mathbf { y } _ { \\mathcal { O } } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 570, + 489, + 586 + ], + "score": 1.0, + "content": "are consistent with the specified attributes", + "type": "text" + }, + { + "bbox": [ + 489, + 574, + 504, + 584 + ], + "score": 0.47, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "score": 1.0, + "content": "(we call this correctness). We also check that the set of images “spans” the extension of the concept,", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 595, + 505, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 595, + 505, + 606 + ], + "score": 1.0, + "content": "by exhibiting suitable diversity (c.f. (Young et al., 2014)). Concretely, we check that the attributes that", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 604, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 239, + 618 + ], + "score": 1.0, + "content": "were not specified (e.g., gender in", + "type": "text" + }, + { + "bbox": [ + 240, + 605, + 259, + 616 + ], + "score": 0.92, + "content": "C _ { * s b }", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 604, + 505, + 618 + ], + "score": 1.0, + "content": "above) vary across the different images; we call this coverage.", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 473, + 629 + ], + "score": 1.0, + "content": "Finally, we want the set of images to have high correctness and coverage even if the concept", + "type": "text" + }, + { + "bbox": [ + 474, + 617, + 488, + 628 + ], + "score": 0.81, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 615, + 505, + 629 + ], + "score": 1.0, + "content": "has", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "score": 1.0, + "content": "a combination of attribute values that have not been seen in training. For example, if we train on", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 107, + 637, + 506, + 651 + ], + "spans": [ + { + "bbox": [ + 107, + 638, + 143, + 649 + ], + "score": 0.74, + "content": "C _ { m s b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 637, + 276, + 651 + ], + "score": 1.0, + "content": "(male, smiling, blackhair), and", + "type": "text" + }, + { + "bbox": [ + 276, + 638, + 311, + 650 + ], + "score": 0.87, + "content": "{ C _ { f n b } = }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 637, + 506, + 651 + ], + "score": 1.0, + "content": "(female, notsmiling, blackhair), we should be", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 648, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 167, + 662 + ], + "score": 1.0, + "content": "able to test on", + "type": "text" + }, + { + "bbox": [ + 168, + 649, + 205, + 660 + ], + "score": 0.8, + "content": "C _ { m n b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 648, + 351, + 662 + ], + "score": 1.0, + "content": "(male, notsmiling, blackhair), and", + "type": "text" + }, + { + "bbox": [ + 352, + 649, + 385, + 661 + ], + "score": 0.85, + "content": "C _ { f s b } =", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 648, + 506, + 662 + ], + "score": 1.0, + "content": "(female, smiling, blackhair).", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 104, + 659, + 506, + 674 + ], + "spans": [ + { + "bbox": [ + 104, + 659, + 506, + 674 + ], + "score": 1.0, + "content": "We will call this property compositionality. Being able to generate plausible images in response to", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 669, + 506, + 684 + ], + "spans": [ + { + "bbox": [ + 105, + 669, + 506, + 684 + ], + "score": 1.0, + "content": "truly compositionally novel queries is the essence of imagination. Together, we call these criteria the", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 104, + 681, + 219, + 695 + ], + "spans": [ + { + "bbox": [ + 104, + 681, + 219, + 695 + ], + "score": 1.0, + "content": "3 C’s of visual imagination.", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 41, + "bbox_fs": [ + 104, + 549, + 506, + 695 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 699, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 698, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 711 + ], + "score": 1.0, + "content": "Section 5 reports experimental results on two different datasets. The first dataset is a modified version", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 709, + 506, + 721 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 721 + ], + "score": 1.0, + "content": "of MNIST, which we call MNIST-with-attributes (or MNIST-A), in which we “render” modified", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 720, + 506, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 260, + 733 + ], + "score": 1.0, + "content": "versions of a single MNIST digit on a", + "type": "text" + }, + { + "bbox": [ + 261, + 721, + 288, + 731 + ], + "score": 0.44, + "content": "6 4 \\mathrm { x } 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 720, + 506, + 733 + ], + "score": 1.0, + "content": "canvas, varying its location, orientation and size. The", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 370, + 95 + ], + "score": 1.0, + "content": "second dataset is CelebA (Liu et al., 2015), which consists of over", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 370, + 83, + 392, + 93 + ], + "score": 0.57, + "content": "2 0 0 \\mathrm { k }", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 392, + 81, + 506, + 95 + ], + "score": 1.0, + "content": "face images, annotated with", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 489, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 489, + 105 + ], + "score": 1.0, + "content": "40 binary attributes. We show that our method outperforms previous methods on these datasets.", + "type": "text", + "cross_page": true + } + ], + "index": 1 + } + ], + "index": 49, + "bbox_fs": [ + 105, + 698, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 82, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 370, + 95 + ], + "score": 1.0, + "content": "second dataset is CelebA (Liu et al., 2015), which consists of over", + "type": "text" + }, + { + "bbox": [ + 370, + 83, + 392, + 93 + ], + "score": 0.57, + "content": "2 0 0 \\mathrm { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 81, + 506, + 95 + ], + "score": 1.0, + "content": "face images, annotated with", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 489, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 489, + 105 + ], + "score": 1.0, + "content": "40 binary attributes. We show that our method outperforms previous methods on these datasets.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 107, + 110, + 505, + 188 + ], + "lines": [ + { + "bbox": [ + 105, + 111, + 505, + 123 + ], + "spans": [ + { + "bbox": [ + 105, + 111, + 505, + 123 + ], + "score": 1.0, + "content": "The contributions of this paper are threefold. First, we present a novel extension to VAEs in the", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 121, + 506, + 134 + ], + "spans": [ + { + "bbox": [ + 105, + 121, + 506, + 134 + ], + "score": 1.0, + "content": "multimodal setting, introducing a principled new training objective (the TELBO), and deriving an", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 132, + 505, + 145 + ], + "spans": [ + { + "bbox": [ + 105, + 132, + 505, + 145 + ], + "score": 1.0, + "content": "interpretation of a previously proposed objective (JMVAE) (Wang et al., 2016a) as a valid alternative", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 144, + 504, + 155 + ], + "spans": [ + { + "bbox": [ + 106, + 144, + 504, + 155 + ], + "score": 1.0, + "content": "in Appendix A.1. Second, we present a novel way to handle missing data in inference networks", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 155, + 504, + 166 + ], + "spans": [ + { + "bbox": [ + 106, + 155, + 504, + 166 + ], + "score": 1.0, + "content": "based on a product of experts. Third, we present novel criteria (the 3 C’s) for evaluating conditional", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 105, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "generative models of images, that extends prior work by considering the notion of visual abstraction", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 177, + 176, + 188 + ], + "spans": [ + { + "bbox": [ + 106, + 177, + 176, + 188 + ], + "score": 1.0, + "content": "and imagination.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 5 + }, + { + "type": "title", + "bbox": [ + 107, + 204, + 178, + 217 + ], + "lines": [ + { + "bbox": [ + 104, + 203, + 181, + 219 + ], + "spans": [ + { + "bbox": [ + 104, + 203, + 181, + 219 + ], + "score": 1.0, + "content": "2 METHODS", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 230, + 504, + 253 + ], + "lines": [ + { + "bbox": [ + 105, + 229, + 506, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 229, + 506, + 243 + ], + "score": 1.0, + "content": "We start by describing standard VAEs, to introduce notation. We then discuss our extensions to", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 240, + 322, + 254 + ], + "spans": [ + { + "bbox": [ + 105, + 240, + 322, + 254 + ], + "score": 1.0, + "content": "handle the multimodal and the missing input settings.", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10.5 + }, + { + "type": "text", + "bbox": [ + 106, + 264, + 505, + 345 + ], + "lines": [ + { + "bbox": [ + 106, + 265, + 505, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 265, + 505, + 277 + ], + "score": 1.0, + "content": "Standard VAEs. A variational autoencoder (Kingma & Welling, 2014) is a latent variable model", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 276, + 505, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 276, + 154, + 289 + ], + "score": 1.0, + "content": "of the form", + "type": "text" + }, + { + "bbox": [ + 154, + 276, + 257, + 289 + ], + "score": 0.91, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { x } , \\mathbf { z } ) = p _ { \\pmb { \\theta } } ( \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 276, + 288, + 289 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 288, + 277, + 312, + 288 + ], + "score": 0.92, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 276, + 469, + 289 + ], + "score": 1.0, + "content": "is the prior (we assume it is Gaussian,", + "type": "text" + }, + { + "bbox": [ + 469, + 276, + 505, + 289 + ], + "score": 0.9, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { z } ) =", + "type": "inline_equation" + } + ], + "index": 13 + }, + { + "bbox": [ + 107, + 286, + 506, + 300 + ], + "spans": [ + { + "bbox": [ + 107, + 287, + 147, + 299 + ], + "score": 0.92, + "content": "\\mathcal { N } ( \\mathbf { z } | \\mathbf { 0 } , \\mathbf { I } )", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 286, + 332, + 300 + ], + "score": 1.0, + "content": ", although this assumption can be relaxed), and", + "type": "text" + }, + { + "bbox": [ + 332, + 288, + 365, + 299 + ], + "score": 0.93, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 286, + 506, + 300 + ], + "score": 1.0, + "content": "is the likelihood (sometimes called", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 298, + 506, + 311 + ], + "spans": [ + { + "bbox": [ + 106, + 298, + 506, + 311 + ], + "score": 1.0, + "content": "the decoder), usually represented by a neural network. 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By default,", + "type": "text" + }, + { + "bbox": [ + 486, + 373, + 506, + 384 + ], + "score": 0.85, + "content": "\\beta =", + "type": "inline_equation" + } + ], + "index": 20 + }, + { + "bbox": [ + 107, + 381, + 505, + 397 + ], + "spans": [ + { + "bbox": [ + 107, + 384, + 132, + 394 + ], + "score": 0.88, + "content": "\\lambda = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 132, + 381, + 267, + 397 + ], + "score": 1.0, + "content": ", in which case we will just write", + "type": "text" + }, + { + "bbox": [ + 267, + 383, + 320, + 395 + ], + "score": 0.86, + "content": "\\mathrm { e l b o } ( { \\bf x } , \\pmb { \\theta } , \\phi )", + "type": "inline_equation" + }, + { + "bbox": [ + 321, + 381, + 403, + 397 + ], + "score": 1.0, + "content": ". 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And allowing", + "type": "text" + }, + { + "bbox": [ + 221, + 416, + 246, + 426 + ], + "score": 0.89, + "content": "\\lambda > 1", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 416, + 467, + 428 + ], + "score": 1.0, + "content": "will be useful later, when we have multiple modalities.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 22 + }, + { + "type": "text", + "bbox": [ + 106, + 439, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 105, + 439, + 505, + 454 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 505, + 454 + ], + "score": 1.0, + "content": "Joint VAEs and the TELBO. We extend the VAE to model images and attributes by defining", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 451, + 506, + 465 + ], + "spans": [ + { + "bbox": [ + 106, + 451, + 191, + 465 + ], + "score": 1.0, + "content": "the joint distribution", + "type": "text" + }, + { + "bbox": [ + 191, + 452, + 336, + 464 + ], + "score": 0.92, + "content": "\\begin{array} { r } { p _ { \\pmb { \\theta } } ( \\mathbf { x } , \\mathbf { y } , \\mathbf { z } ) = p _ { \\pmb { \\theta } } ( \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 451, + 367, + 465 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 367, + 452, + 400, + 464 + ], + "score": 0.92, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 451, + 506, + 465 + ], + "score": 1.0, + "content": "is the image decoder (we", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 463, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 106, + 463, + 360, + 475 + ], + "score": 1.0, + "content": "use the DCGAN architecture from Radford et al. (2016)), and", + "type": "text" + }, + { + "bbox": [ + 360, + 464, + 393, + 474 + ], + "score": 0.92, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 463, + 505, + 475 + ], + "score": 1.0, + "content": "is an MLP for the attribute", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 472, + 505, + 487 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 458, + 487 + ], + "score": 1.0, + "content": "vector. 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And allowing", + "type": "text" + }, + { + "bbox": [ + 221, + 416, + 246, + 426 + ], + "score": 0.89, + "content": "\\lambda > 1", + "type": "inline_equation" + }, + { + "bbox": [ + 246, + 416, + 467, + 428 + ], + "score": 1.0, + "content": "will be useful later, when we have multiple modalities.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 22, + "bbox_fs": [ + 105, + 371, + 506, + 428 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 439, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 105, + 439, + 505, + 454 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 505, + 454 + ], + "score": 1.0, + "content": "Joint VAEs and the TELBO. We extend the VAE to model images and attributes by defining", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 451, + 506, + 465 + ], + "spans": [ + { + "bbox": [ + 106, + 451, + 191, + 465 + ], + "score": 1.0, + "content": "the joint distribution", + "type": "text" + }, + { + "bbox": [ + 191, + 452, + 336, + 464 + ], + "score": 0.92, + "content": "\\begin{array} { r } { p _ { \\pmb { \\theta } } ( \\mathbf { x } , \\mathbf { y } , \\mathbf { z } ) = p _ { \\pmb { \\theta } } ( \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } ) p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 451, + 367, + 465 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 367, + 452, + 400, + 464 + ], + "score": 0.92, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 451, + 506, + 465 + ], + "score": 1.0, + "content": "is the image decoder (we", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 463, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 106, + 463, + 360, + 475 + ], + "score": 1.0, + "content": "use the DCGAN architecture from Radford et al. (2016)), and", + "type": "text" + }, + { + "bbox": [ + 360, + 464, + 393, + 474 + ], + "score": 0.92, + "content": "p _ { \\pmb { \\theta } } ( \\mathbf { y } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 463, + 505, + 475 + ], + "score": 1.0, + "content": "is an MLP for the attribute", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 472, + 505, + 487 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 458, + 487 + ], + "score": 1.0, + "content": "vector. The corresponding training objective which we want to maximize becomes", + "type": "text" + }, + { + "bbox": [ + 458, + 473, + 505, + 486 + ], + "score": 0.92, + "content": "{ \\mathcal { L } } ( \\theta , \\phi ) =", + "type": "inline_equation" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 483, + 507, + 504 + ], + "spans": [ + { + "bbox": [ + 106, + 486, + 209, + 499 + ], + "score": 0.84, + "content": "\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { e l b o } ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) \\right]", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 483, + 241, + 504 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 241, + 484, + 388, + 500 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\hat { p } ( \\mathbf x , \\mathbf y ) = \\frac { 1 } { N } \\sum _ { n = 1 } ^ { N } \\delta _ { \\mathbf x _ { n } } ( \\mathbf x ) \\delta _ { \\mathbf y _ { n } } ( \\mathbf y _ { n } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 483, + 507, + 504 + ], + "score": 1.0, + "content": "is the empirical distribution", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 497, + 336, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 336, + 511 + ], + "score": 1.0, + "content": "derived from paired data, and the joint ELBO is given by", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 27.5, + "bbox_fs": [ + 105, + 439, + 507, + 511 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 116, + 516, + 494, + 549 + ], + "lines": [ + { + "bbox": [ + 116, + 516, + 494, + 549 + ], + "spans": [ + { + "bbox": [ + 116, + 516, + 494, + 549 + ], + "score": 0.92, + "content": "\\begin{array} { r l r } & { } & { \\mathrm { e l b o } _ { \\lambda _ { x } , \\lambda _ { y } , \\beta } ( { \\bf x } , { \\bf y } , \\pmb { \\theta } _ { x } , \\pmb { \\theta } _ { y } , \\phi ) = \\mathbb { E } _ { q _ { \\phi } ( { \\bf z } | { \\bf x } , { \\bf y } ) } \\left[ \\lambda _ { x } \\log p _ { \\pmb { \\theta } _ { x } } ( { \\bf x } | { \\bf z } ) + \\lambda _ { y } \\log p _ { \\pmb { \\theta } _ { y } } ( { \\bf y } | { \\bf z } ) \\right] \\quad } \\\\ & { } & { - \\beta \\mathrm { K L } ( q _ { \\phi } ( { \\bf z } | { \\bf x } , { \\bf y } ) , p _ { \\theta } ( { \\bf z } ) ) } \\end{array}", + "type": "interline_equation", + "image_path": "5ff2b02e059b868663f64eabf6562f73c7cd2970eeecb97c627d3c8e2673e210.jpg" + } + ] + } + ], + "index": 32, + "virtual_lines": [ + { + "bbox": [ + 116, + 516, + 494, + 527.0 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 116, + 527.0, + 494, + 538.0 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 116, + 538.0, + 494, + 549.0 + ], + "spans": [], + "index": 33 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 553, + 504, + 587 + ], + "lines": [ + { + "bbox": [ + 105, + 552, + 506, + 567 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 331, + 567 + ], + "score": 1.0, + "content": "We call this the JVAE (joint VAE) model. 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Keeping", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 121, + 629 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 121, + 618, + 128, + 628 + ], + "score": 0.81, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 128, + 615, + 388, + 629 + ], + "score": 1.0, + "content": "family fixed from the joint model, a natural objective to fit, say,", + "type": "text" + }, + { + "bbox": [ + 389, + 615, + 426, + 629 + ], + "score": 0.93, + "content": "q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 615, + 505, + 629 + ], + "score": 1.0, + "content": "is to maximize the", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 627, + 153, + 643 + ], + "spans": [ + { + "bbox": [ + 105, + 627, + 153, + 643 + ], + "score": 1.0, + "content": "following:1", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 38.5, + "bbox_fs": [ + 104, + 590, + 506, + 643 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 644, + 502, + 704 + ], + "lines": [ + { + "bbox": [ + 111, + 644, + 502, + 704 + ], + "spans": [ + { + "bbox": [ + 111, + 644, + 502, + 704 + ], + "score": 0.91, + "content": "\\begin{array} { r l } & { \\mathcal { L } ( \\phi _ { x } | \\theta ) = - \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\mathrm { K L } ( q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) , p _ { \\theta _ { x } } ( \\mathbf { z } | \\mathbf { x } ) ) \\right] } \\\\ & { \\quad \\quad \\quad = \\displaystyle \\int \\int d \\mathbf { x } d \\mathbf { z } \\hat { p } ( \\mathbf { x } ) q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) \\left[ - \\log q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) - \\log p _ { \\theta _ { x } } ( \\mathbf { x } ) + \\log p _ { \\theta _ { x } } ( \\mathbf { x } | \\mathbf { z } ) + \\log p _ { \\theta } ( \\mathbf { z } ) \\right] } \\\\ & { \\quad \\quad \\quad = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\mathrm { e l b o } ( \\mathbf { x } , \\theta _ { x } , \\phi _ { x } ) \\right] - \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\log p _ { \\theta _ { x } } ( \\mathbf { x } ) \\right] } \\end{array}", + "type": "interline_equation", + "image_path": "ed9b51ff0c5d94bc4c093d09977d740989cbe4b934ce945692c060d021611c68.jpg" + } + ] + } + ], + "index": 42, + "virtual_lines": [ + { + "bbox": [ + 111, + 644, + 502, + 664.0 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 111, + 664.0, + 502, + 684.0 + ], + "spans": [], + "index": 42 + }, + { + "bbox": [ + 111, + 684.0, + 502, + 704.0 + ], + "spans": [], + "index": 43 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 113, + 83, + 502, + 172 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 113, + 83, + 502, + 172 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 113, + 83, + 502, + 172 + ], + "spans": [ + { + "bbox": [ + 113, + 83, + 502, + 172 + ], + "score": 0.959, + "type": "image", + "image_path": "3626395a8ff14eb60506a0ca4184450c7060dd974d57a894b45710f69c9fe7d6.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 113, + 83, + 502, + 112.66666666666667 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 113, + 112.66666666666667, + 502, + 142.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 113, + 142.33333333333334, + 502, + 172.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 184, + 505, + 235 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 183, + 506, + 196 + ], + "spans": [ + { + "bbox": [ + 106, + 183, + 506, + 196 + ], + "score": 1.0, + "content": "Figure 2: Illustration of the product of experts inference network. 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Right: we illustrate how inclusion of the “universal expert”", + "type": "text" + }, + { + "bbox": [ + 377, + 214, + 394, + 225 + ], + "score": 0.91, + "content": "p ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 395, + 213, + 506, + 226 + ], + "score": 1.0, + "content": "in the product ensures that the", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 224, + 467, + 236 + ], + "spans": [ + { + "bbox": [ + 105, + 224, + 467, + 236 + ], + "score": 1.0, + "content": "posterior is always well-conditioned (close to spherical), even when we are missing some attributes.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5 + } + ], + "index": 3.0 + }, + { + "type": "text", + "bbox": [ + 107, + 245, + 505, + 280 + ], + "lines": [ + { + "bbox": [ + 105, + 245, + 505, + 258 + ], + "spans": [ + { + "bbox": [ + 105, + 245, + 248, + 258 + ], + "score": 1.0, + "content": "where the last term is constant wrt", + "type": "text" + }, + { + "bbox": [ + 248, + 246, + 261, + 257 + ], + "score": 0.9, + "content": "\\phi _ { x }", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 245, + 351, + 258 + ], + "score": 1.0, + "content": "and the model family", + "type": "text" + }, + { + "bbox": [ + 351, + 248, + 358, + 257 + ], + "score": 0.78, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 245, + 505, + 258 + ], + "score": 1.0, + "content": ", and hence can be dropped. We can", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 256, + 505, + 270 + ], + "spans": [ + { + "bbox": [ + 105, + 256, + 216, + 270 + ], + "score": 1.0, + "content": "use a similar method to fit", + "type": "text" + }, + { + "bbox": [ + 216, + 257, + 253, + 270 + ], + "score": 0.93, + "content": "q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 256, + 505, + 270 + ], + "score": 1.0, + "content": ". Combining these gives the following triple ELBO (TELBO)", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 267, + 149, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 267, + 149, + 282 + ], + "score": 1.0, + "content": "objective:", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9 + }, + { + "type": "interline_equation", + "bbox": [ + 116, + 287, + 483, + 320 + ], + "lines": [ + { + "bbox": [ + 116, + 287, + 483, + 320 + ], + "spans": [ + { + "bbox": [ + 116, + 287, + 483, + 320 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { { \\mathcal { L } } ( \\theta _ { x } , \\theta _ { y } , \\phi , \\phi _ { x } , \\phi _ { y } ) = \\mathbf { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { e l b o } _ { 1 , \\lambda , 1 } ( \\mathbf { x } , \\mathbf { y } , \\theta _ { x } , \\theta _ { y } , \\phi ) \\right. } \\\\ & { ~ \\left. ~ + \\mathrm { e l b o } _ { 1 , 1 } ( \\mathbf { x } , \\theta _ { x } , \\phi _ { x } ) + \\mathrm { e l b o } _ { \\gamma , 1 } ( \\mathbf { y } , \\theta _ { y } , \\phi _ { y } ) \\right] } \\end{array}", + "type": "interline_equation", + "image_path": "a98204e0d2b5d2b0d8d6e94d95849059674c2737eb43916c93cd71c4c20beb34.jpg" + } + ] + } + ], + "index": 12, + "virtual_lines": [ + { + "bbox": [ + 116, + 287, + 483, + 298.0 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 116, + 298.0, + 483, + 309.0 + ], + "spans": [], + "index": 12 + }, + { + "bbox": [ + 116, + 309.0, + 483, + 320.0 + ], + "spans": [], + "index": 13 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 506, + 404 + ], + "lines": [ + { + "bbox": [ + 105, + 323, + 506, + 337 + ], + "spans": [ + { + "bbox": [ + 105, + 323, + 133, + 337 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 325, + 140, + 334 + ], + "score": 0.79, + "content": "\\lambda", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 323, + 158, + 337 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 158, + 326, + 166, + 336 + ], + "score": 0.84, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 323, + 287, + 337 + ], + "score": 1.0, + "content": "scale the log likelihood terms", + "type": "text" + }, + { + "bbox": [ + 287, + 324, + 330, + 336 + ], + "score": 0.92, + "content": "\\log p ( \\mathbf { y } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 323, + 506, + 337 + ], + "score": 1.0, + "content": "; we set these parameters using a validation", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "score": 1.0, + "content": "set. Since we are training the generative model only on aligned data, and simply retrofitting inference", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 346, + 506, + 359 + ], + "spans": [ + { + "bbox": [ + 105, + 346, + 202, + 359 + ], + "score": 1.0, + "content": "networks, we freeze the", + "type": "text" + }, + { + "bbox": [ + 203, + 346, + 240, + 358 + ], + "score": 0.93, + "content": "p _ { \\pmb { \\theta } _ { x } } ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 240, + 346, + 257, + 359 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 258, + 346, + 295, + 358 + ], + "score": 0.92, + "content": "p _ { \\pmb { \\theta } _ { y } } ( \\mathbf { y } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 346, + 506, + 359 + ], + "score": 1.0, + "content": "terms when training the last two ELBO terms above,", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 356, + 506, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 176, + 370 + ], + "score": 1.0, + "content": "and just optimize", + "type": "text" + }, + { + "bbox": [ + 176, + 357, + 214, + 370 + ], + "score": 0.93, + "content": "q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 214, + 356, + 232, + 370 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 232, + 357, + 270, + 370 + ], + "score": 0.93, + "content": "q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 356, + 506, + 370 + ], + "score": 1.0, + "content": "terms. This enables us to optimize all terms in Equation (2)", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 370, + 505, + 382 + ], + "spans": [ + { + "bbox": [ + 104, + 370, + 505, + 382 + ], + "score": 1.0, + "content": "jointly. Alternatively, we can first fit the joint model, and then fit the unimodal inference networks.2", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "score": 1.0, + "content": "In Section 4, we compare this to other methods for training joint VAEs that have been proposed in", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 391, + 162, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 391, + 162, + 405 + ], + "score": 1.0, + "content": "the literature.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 17 + }, + { + "type": "text", + "bbox": [ + 106, + 415, + 506, + 640 + ], + "lines": [ + { + "bbox": [ + 106, + 415, + 506, + 428 + ], + "spans": [ + { + "bbox": [ + 106, + 415, + 506, + 428 + ], + "score": 1.0, + "content": "Handling missing attributes. In order to handle missing attributes at test time, we use a prod-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 427, + 506, + 439 + ], + "spans": [ + { + "bbox": [ + 106, + 427, + 506, + 439 + ], + "score": 1.0, + "content": "uct of experts model, where each attribute instantiates an expert. We are motivated by prior", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 437, + 507, + 451 + ], + "spans": [ + { + "bbox": [ + 105, + 437, + 507, + 451 + ], + "score": 1.0, + "content": "work (Williams & Nash, 2018) which shows that for a linear factor analysis model, the poste-", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 448, + 507, + 461 + ], + "spans": [ + { + "bbox": [ + 104, + 448, + 173, + 461 + ], + "score": 1.0, + "content": "rior distribution", + "type": "text" + }, + { + "bbox": [ + 173, + 449, + 201, + 461 + ], + "score": 0.96, + "content": "p ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 448, + 264, + 461 + ], + "score": 1.0, + "content": "is a product of", + "type": "text" + }, + { + "bbox": [ + 265, + 449, + 275, + 459 + ], + "score": 0.83, + "content": "K", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 448, + 507, + 461 + ], + "score": 1.0, + "content": "-dimensional Gaussians, one for each visible dimension.", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 459, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 506, + 473 + ], + "score": 1.0, + "content": "Since our model is just a nonlinear extension of factor analysis, we choose the form of the ap-", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 471, + 506, + 483 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 297, + 483 + ], + "score": 1.0, + "content": "proximate posterior of our inference network,", + "type": "text" + }, + { + "bbox": [ + 297, + 471, + 324, + 483 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 471, + 506, + 483 + ], + "score": 1.0, + "content": ", to be a product of Gaussians, one for each", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 480, + 507, + 497 + ], + "spans": [ + { + "bbox": [ + 104, + 480, + 171, + 497 + ], + "score": 1.0, + "content": "visible feature:", + "type": "text" + }, + { + "bbox": [ + 171, + 482, + 297, + 494 + ], + "score": 0.9, + "content": "\\begin{array} { r } { q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) \\propto p ( \\mathbf { z } ) \\prod _ { k \\in \\mathcal { O } } q ( \\mathbf { z } | y _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 480, + 328, + 497 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 328, + 482, + 463, + 494 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | y _ { k } ) { \\overset { \\cdot } { = } } { \\mathcal { N } } ( \\mathbf { z } | \\mu _ { k } ( y _ { k } ) , \\mathbf { C } _ { k } ( y _ { k } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 463, + 480, + 507, + 497 + ], + "score": 1.0, + "content": "is the kth", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 493, + 507, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 493, + 204, + 507 + ], + "score": 1.0, + "content": "Gaussian “expert”, and", + "type": "text" + }, + { + "bbox": [ + 205, + 494, + 331, + 506 + ], + "score": 0.9, + "content": "p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\boldsymbol { \\mu } _ { 0 } = \\mathbf { 0 } , \\mathbf { C } _ { 0 } = \\mathbf { I } )", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 493, + 507, + 507 + ], + "score": 1.0, + "content": "is the prior. A similar model was concur-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 505, + 506, + 517 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 506, + 517 + ], + "score": 1.0, + "content": "rently proposed in Bouchacourt et al. (2018) to perform inference for a set of images. Unlike the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 104, + 515, + 506, + 528 + ], + "spans": [ + { + "bbox": [ + 104, + 515, + 506, + 528 + ], + "score": 1.0, + "content": "product of experts model in (Hinton, 2002), our model multiplies Gaussians, not Bernoullis, so the", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 102, + 524, + 509, + 543 + ], + "spans": [ + { + "bbox": [ + 102, + 524, + 286, + 543 + ], + "score": 1.0, + "content": "product has a closed form solution namely", + "type": "text" + }, + { + "bbox": [ + 286, + 527, + 381, + 539 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) = \\mathcal { N } ( \\mathbf { z } | \\mu , \\mathbf { C } )", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 524, + 414, + 543 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 414, + 526, + 486, + 540 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\mathbf { C } ^ { - 1 } = \\sum _ { k } \\mathbf { C } _ { k } ^ { - 1 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 524, + 509, + 543 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 538, + 507, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 538, + 195, + 552 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\pmb { \\mu } = \\mathbf { C } ( \\sum _ { k } \\mathbf { C } _ { k } ^ { - 1 } \\pmb { \\mu } _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 538, + 507, + 554 + ], + "score": 1.0, + "content": ", and the sum is over all the observed attributes. Intuitively, y imposes an", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 550, + 505, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 251, + 563 + ], + "score": 1.0, + "content": "increasing number of constraints on", + "type": "text" + }, + { + "bbox": [ + 251, + 553, + 258, + 560 + ], + "score": 0.46, + "content": "\\mathbf { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 550, + 505, + 563 + ], + "score": 1.0, + "content": "as more of it is observed, as explained in Williams & Agakov", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 561, + 506, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 506, + 574 + ], + "score": 1.0, + "content": "(2002). In our setting, if we do not observe any attributes, the posterior reduces to the prior. As", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "score": 1.0, + "content": "we observe more attributes, the posterior becomes narrower, since the (positive definite) precision", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 144, + 596 + ], + "score": 1.0, + "content": "matrices,", + "type": "text" + }, + { + "bbox": [ + 144, + 583, + 164, + 594 + ], + "score": 0.89, + "content": "\\mathbf { C } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 582, + 506, + 596 + ], + "score": 1.0, + "content": "add up, reflecting the increased specificity of the concept being specified, as illustrated", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 593, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 593, + 483, + 607 + ], + "score": 1.0, + "content": "in Figure 2 (middle) (see also Williams & Agakov (2002)). We always include the prior term,", + "type": "text" + }, + { + "bbox": [ + 483, + 594, + 502, + 606 + ], + "score": 0.91, + "content": "p ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 593, + 506, + 607 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 605, + 506, + 619 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 288, + 619 + ], + "score": 1.0, + "content": "in the product, since without it, the posterior", + "type": "text" + }, + { + "bbox": [ + 288, + 605, + 332, + 619 + ], + "score": 0.92, + "content": "q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 605, + 506, + 619 + ], + "score": 1.0, + "content": "may not be well-conditioned when we are", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 618, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 106, + 618, + 505, + 629 + ], + "score": 1.0, + "content": "missing attributes, as illustrated in Figure 2 (right). For more implementation-level details on the", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 628, + 266, + 641 + ], + "spans": [ + { + "bbox": [ + 105, + 628, + 266, + 641 + ], + "score": 1.0, + "content": "model architectures, see Appendix A.4.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 30.5 + }, + { + "type": "title", + "bbox": [ + 106, + 655, + 433, + 669 + ], + "lines": [ + { + "bbox": [ + 104, + 654, + 435, + 671 + ], + "spans": [ + { + "bbox": [ + 104, + 654, + 435, + 671 + ], + "score": 1.0, + "content": "3 EVALUATION METRICS: THE 3C’S OF VISUAL IMAGINATION", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 107, + 680, + 502, + 703 + ], + "lines": [ + { + "bbox": [ + 105, + 679, + 505, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 679, + 323, + 694 + ], + "score": 1.0, + "content": "To evaluate the quality of a set of generated images,", + "type": "text" + }, + { + "bbox": [ + 323, + 680, + 487, + 693 + ], + "score": 0.93, + "content": "S ( \\mathbf { y } _ { \\mathcal { O } } ) = \\{ \\mathbf { x } _ { s } \\sim p ( \\mathbf { x } | \\mathbf { y } _ { \\mathcal { O } } ) : s = 1 : S \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 679, + 505, + 694 + ], + "score": 1.0, + "content": ", we", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 691, + 505, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 691, + 459, + 705 + ], + "score": 1.0, + "content": "apply a multi-label classifier to each image, to convert it to a predicted attribute vector,", + "type": "text" + }, + { + "bbox": [ + 459, + 692, + 480, + 704 + ], + "score": 0.88, + "content": "\\hat { \\mathbf { y } } ( \\mathbf x )", + "type": "inline_equation" + }, + { + "bbox": [ + 480, + 691, + 505, + 705 + ], + "score": 1.0, + "content": ". 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Each expert votes for a part of latent space", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 194, + 505, + 205 + ], + "spans": [ + { + "bbox": [ + 106, + 194, + 505, + 205 + ], + "score": 1.0, + "content": "implied by its observed attribute. The final posterior is the intersection of these regions. When all attributes are", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 204, + 506, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 204, + 506, + 215 + ], + "score": 1.0, + "content": "observed, the posterior will be a narrowly defined Gaussian, but when some attributes are missing, the posterior", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 213, + 506, + 226 + ], + "spans": [ + { + "bbox": [ + 105, + 213, + 376, + 226 + ], + "score": 1.0, + "content": "will be broader. 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This enables us to optimize all terms in Equation (2)", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 370, + 505, + 382 + ], + "spans": [ + { + "bbox": [ + 104, + 370, + 505, + 382 + ], + "score": 1.0, + "content": "jointly. Alternatively, we can first fit the joint model, and then fit the unimodal inference networks.2", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 394 + ], + "score": 1.0, + "content": "In Section 4, we compare this to other methods for training joint VAEs that have been proposed in", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 391, + 162, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 391, + 162, + 405 + ], + "score": 1.0, + "content": "the literature.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 17, + "bbox_fs": [ + 104, + 323, + 506, + 405 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 415, + 506, + 640 + ], + "lines": [ + { + "bbox": [ + 106, + 415, + 506, + 428 + ], + "spans": [ + { + "bbox": [ + 106, + 415, + 506, + 428 + ], + "score": 1.0, + "content": "Handling missing attributes. In order to handle missing attributes at test time, we use a prod-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 427, + 506, + 439 + ], + "spans": [ + { + "bbox": [ + 106, + 427, + 506, + 439 + ], + "score": 1.0, + "content": "uct of experts model, where each attribute instantiates an expert. We are motivated by prior", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 437, + 507, + 451 + ], + "spans": [ + { + "bbox": [ + 105, + 437, + 507, + 451 + ], + "score": 1.0, + "content": "work (Williams & Nash, 2018) which shows that for a linear factor analysis model, the poste-", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 448, + 507, + 461 + ], + "spans": [ + { + "bbox": [ + 104, + 448, + 173, + 461 + ], + "score": 1.0, + "content": "rior distribution", + "type": "text" + }, + { + "bbox": [ + 173, + 449, + 201, + 461 + ], + "score": 0.96, + "content": "p ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 448, + 264, + 461 + ], + "score": 1.0, + "content": "is a product of", + "type": "text" + }, + { + "bbox": [ + 265, + 449, + 275, + 459 + ], + "score": 0.83, + "content": "K", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 448, + 507, + 461 + ], + "score": 1.0, + "content": "-dimensional Gaussians, one for each visible dimension.", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 459, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 506, + 473 + ], + "score": 1.0, + "content": "Since our model is just a nonlinear extension of factor analysis, we choose the form of the ap-", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 471, + 506, + 483 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 297, + 483 + ], + "score": 1.0, + "content": "proximate posterior of our inference network,", + "type": "text" + }, + { + "bbox": [ + 297, + 471, + 324, + 483 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 471, + 506, + 483 + ], + "score": 1.0, + "content": ", to be a product of Gaussians, one for each", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 480, + 507, + 497 + ], + "spans": [ + { + "bbox": [ + 104, + 480, + 171, + 497 + ], + "score": 1.0, + "content": "visible feature:", + "type": "text" + }, + { + "bbox": [ + 171, + 482, + 297, + 494 + ], + "score": 0.9, + "content": "\\begin{array} { r } { q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) \\propto p ( \\mathbf { z } ) \\prod _ { k \\in \\mathcal { O } } q ( \\mathbf { z } | y _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 480, + 328, + 497 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 328, + 482, + 463, + 494 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | y _ { k } ) { \\overset { \\cdot } { = } } { \\mathcal { N } } ( \\mathbf { z } | \\mu _ { k } ( y _ { k } ) , \\mathbf { C } _ { k } ( y _ { k } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 463, + 480, + 507, + 497 + ], + "score": 1.0, + "content": "is the kth", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 493, + 507, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 493, + 204, + 507 + ], + "score": 1.0, + "content": "Gaussian “expert”, and", + "type": "text" + }, + { + "bbox": [ + 205, + 494, + 331, + 506 + ], + "score": 0.9, + "content": "p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\boldsymbol { \\mu } _ { 0 } = \\mathbf { 0 } , \\mathbf { C } _ { 0 } = \\mathbf { I } )", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 493, + 507, + 507 + ], + "score": 1.0, + "content": "is the prior. A similar model was concur-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 505, + 506, + 517 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 506, + 517 + ], + "score": 1.0, + "content": "rently proposed in Bouchacourt et al. (2018) to perform inference for a set of images. Unlike the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 104, + 515, + 506, + 528 + ], + "spans": [ + { + "bbox": [ + 104, + 515, + 506, + 528 + ], + "score": 1.0, + "content": "product of experts model in (Hinton, 2002), our model multiplies Gaussians, not Bernoullis, so the", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 102, + 524, + 509, + 543 + ], + "spans": [ + { + "bbox": [ + 102, + 524, + 286, + 543 + ], + "score": 1.0, + "content": "product has a closed form solution namely", + "type": "text" + }, + { + "bbox": [ + 286, + 527, + 381, + 539 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } ) = \\mathcal { N } ( \\mathbf { z } | \\mu , \\mathbf { C } )", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 524, + 414, + 543 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 414, + 526, + 486, + 540 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\mathbf { C } ^ { - 1 } = \\sum _ { k } \\mathbf { C } _ { k } ^ { - 1 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 524, + 509, + 543 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 538, + 507, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 538, + 195, + 552 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\pmb { \\mu } = \\mathbf { C } ( \\sum _ { k } \\mathbf { C } _ { k } ^ { - 1 } \\pmb { \\mu } _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 538, + 507, + 554 + ], + "score": 1.0, + "content": ", and the sum is over all the observed attributes. Intuitively, y imposes an", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 550, + 505, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 251, + 563 + ], + "score": 1.0, + "content": "increasing number of constraints on", + "type": "text" + }, + { + "bbox": [ + 251, + 553, + 258, + 560 + ], + "score": 0.46, + "content": "\\mathbf { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 550, + 505, + 563 + ], + "score": 1.0, + "content": "as more of it is observed, as explained in Williams & Agakov", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 561, + 506, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 506, + 574 + ], + "score": 1.0, + "content": "(2002). In our setting, if we do not observe any attributes, the posterior reduces to the prior. As", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "score": 1.0, + "content": "we observe more attributes, the posterior becomes narrower, since the (positive definite) precision", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 144, + 596 + ], + "score": 1.0, + "content": "matrices,", + "type": "text" + }, + { + "bbox": [ + 144, + 583, + 164, + 594 + ], + "score": 0.89, + "content": "\\mathbf { C } ^ { - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 582, + 506, + 596 + ], + "score": 1.0, + "content": "add up, reflecting the increased specificity of the concept being specified, as illustrated", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 593, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 593, + 483, + 607 + ], + "score": 1.0, + "content": "in Figure 2 (middle) (see also Williams & Agakov (2002)). We always include the prior term,", + "type": "text" + }, + { + "bbox": [ + 483, + 594, + 502, + 606 + ], + "score": 0.91, + "content": "p ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 593, + 506, + 607 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 605, + 506, + 619 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 288, + 619 + ], + "score": 1.0, + "content": "in the product, since without it, the posterior", + "type": "text" + }, + { + "bbox": [ + 288, + 605, + 332, + 619 + ], + "score": 0.92, + "content": "q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 605, + 506, + 619 + ], + "score": 1.0, + "content": "may not be well-conditioned when we are", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 618, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 106, + 618, + 505, + 629 + ], + "score": 1.0, + "content": "missing attributes, as illustrated in Figure 2 (right). For more implementation-level details on the", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 628, + 266, + 641 + ], + "spans": [ + { + "bbox": [ + 105, + 628, + 266, + 641 + ], + "score": 1.0, + "content": "model architectures, see Appendix A.4.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 30.5, + "bbox_fs": [ + 102, + 415, + 509, + 641 + ] + }, + { + "type": "title", + "bbox": [ + 106, + 655, + 433, + 669 + ], + "lines": [ + { + "bbox": [ + 104, + 654, + 435, + 671 + ], + "spans": [ + { + "bbox": [ + 104, + 654, + 435, + 671 + ], + "score": 1.0, + "content": "3 EVALUATION METRICS: THE 3C’S OF VISUAL IMAGINATION", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 107, + 680, + 502, + 703 + ], + "lines": [ + { + "bbox": [ + 105, + 679, + 505, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 679, + 323, + 694 + ], + "score": 1.0, + "content": "To evaluate the quality of a set of generated images,", + "type": "text" + }, + { + "bbox": [ + 323, + 680, + 487, + 693 + ], + "score": 0.93, + "content": "S ( \\mathbf { y } _ { \\mathcal { O } } ) = \\{ \\mathbf { x } _ { s } \\sim p ( \\mathbf { x } | \\mathbf { y } _ { \\mathcal { O } } ) : s = 1 : S \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 679, + 505, + 694 + ], + "score": 1.0, + "content": ", we", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 691, + 505, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 691, + 459, + 705 + ], + "score": 1.0, + "content": "apply a multi-label classifier to each image, to convert it to a predicted attribute vector,", + "type": "text" + }, + { + "bbox": [ + 459, + 692, + 480, + 704 + ], + "score": 0.88, + "content": "\\hat { \\mathbf { y } } ( \\mathbf x )", + "type": "inline_equation" + }, + { + "bbox": [ + 480, + 691, + 505, + 705 + ], + "score": 1.0, + "content": ". This", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 83, + 505, + 94 + ], + "spans": [ + { + "bbox": [ + 106, + 83, + 505, + 94 + ], + "score": 1.0, + "content": "attribute classifier is trained on a large dataset of images and attributes, and is held constant across", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 106 + ], + "score": 1.0, + "content": "all methods that are being evaluated. It plays the role of a human observer. This is similar in spirit", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 505, + 117 + ], + "score": 1.0, + "content": "to generative adversarial networks (Goodfellow et al., 2014), that declare a generated image to be", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "score": 1.0, + "content": "good enough if a binary classifier cannot distinguish it from a real image. (Both approaches avoid the", + "type": "text", + "cross_page": true + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "score": 1.0, + "content": "problems mentioned in Theis et al. (2016) related to evaluating generative image models in terms of", + "type": "text", + "cross_page": true + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 137, + 506, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 137, + 506, + 150 + ], + "score": 1.0, + "content": "their likelihood.) However, the attribute classifier checks not only that the images look realistic, but", + "type": "text", + "cross_page": true + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 148, + 271, + 160 + ], + "spans": [ + { + "bbox": [ + 106, + 148, + 271, + 160 + ], + "score": 1.0, + "content": "also that they have the desired attributes.", + "type": "text", + "cross_page": true + } + ], + "index": 6 + } + ], + "index": 42.5, + "bbox_fs": [ + 105, + 679, + 505, + 705 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 160 + ], + "lines": [ + { + "bbox": [ + 106, + 83, + 505, + 94 + ], + "spans": [ + { + "bbox": [ + 106, + 83, + 505, + 94 + ], + "score": 1.0, + "content": "attribute classifier is trained on a large dataset of images and attributes, and is held constant across", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 106 + ], + "score": 1.0, + "content": "all methods that are being evaluated. It plays the role of a human observer. This is similar in spirit", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 505, + 117 + ], + "score": 1.0, + "content": "to generative adversarial networks (Goodfellow et al., 2014), that declare a generated image to be", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "score": 1.0, + "content": "good enough if a binary classifier cannot distinguish it from a real image. (Both approaches avoid the", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "score": 1.0, + "content": "problems mentioned in Theis et al. (2016) related to evaluating generative image models in terms of", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 137, + 506, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 137, + 506, + 150 + ], + "score": 1.0, + "content": "their likelihood.) However, the attribute classifier checks not only that the images look realistic, but", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 148, + 271, + 160 + ], + "spans": [ + { + "bbox": [ + 106, + 148, + 271, + 160 + ], + "score": 1.0, + "content": "also that they have the desired attributes.", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 3 + }, + { + "type": "text", + "bbox": [ + 107, + 165, + 505, + 302 + ], + "lines": [ + { + "bbox": [ + 106, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "To quantify this, we define the correctness as the fraction of attributes for each gener-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 176, + 504, + 190 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 456, + 190 + ], + "score": 1.0, + "content": "ated image that match those specified in the concept’s description: correctness", + "type": "text" + }, + { + "bbox": [ + 456, + 176, + 504, + 188 + ], + "score": 0.86, + "content": "( \\bar { s } , \\mathbf { y } \\bar { \\omega } ) \\ =", + "type": "inline_equation" + } + ], + "index": 8 + }, + { + "bbox": [ + 107, + 186, + 507, + 202 + ], + "spans": [ + { + "bbox": [ + 107, + 186, + 257, + 202 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\frac { 1 } { | \\mathcal { S } | } \\sum _ { \\mathbf { x } \\in \\mathcal { S } } \\overset { 1 } { \\underset { | \\mathcal { O } | } { \\mid } } \\sum _ { k \\in \\mathcal { O } } \\mathbb { I } ( \\hat { y } ( \\mathbf { x } ) _ { k } = \\overset { \\cdot } { y } _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 186, + 507, + 201 + ], + "score": 1.0, + "content": ". However, we also want to measure the diversity of values", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 200, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 106, + 201, + 273, + 213 + ], + "score": 1.0, + "content": "for the unspecified or missing attributes,", + "type": "text" + }, + { + "bbox": [ + 273, + 200, + 325, + 213 + ], + "score": 0.92, + "content": "\\mathcal { M } = \\mathcal { A } \\backslash \\mathcal { O }", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 201, + 434, + 213 + ], + "score": 1.0, + "content": ". We do this by comparing", + "type": "text" + }, + { + "bbox": [ + 434, + 203, + 445, + 213 + ], + "score": 0.83, + "content": "q _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 201, + 505, + 213 + ], + "score": 1.0, + "content": ", the empirical", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 211, + 505, + 224 + ], + "spans": [ + { + "bbox": [ + 106, + 211, + 250, + 224 + ], + "score": 1.0, + "content": "distribution over values for attribute", + "type": "text" + }, + { + "bbox": [ + 251, + 212, + 258, + 222 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 211, + 374, + 224 + ], + "score": 1.0, + "content": "induced by the generated set", + "type": "text" + }, + { + "bbox": [ + 374, + 212, + 382, + 222 + ], + "score": 0.79, + "content": "s", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 211, + 396, + 224 + ], + "score": 1.0, + "content": ", to", + "type": "text" + }, + { + "bbox": [ + 396, + 213, + 407, + 223 + ], + "score": 0.85, + "content": "p _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 211, + 505, + 224 + ], + "score": 1.0, + "content": ", the true distribution for", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 222, + 505, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 505, + 235 + ], + "score": 1.0, + "content": "this attribute induced by the training set. We measure the difference between these distributions", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 234, + 505, + 246 + ], + "spans": [ + { + "bbox": [ + 106, + 234, + 395, + 246 + ], + "score": 1.0, + "content": "using the Jensen-Shannon divergence, since it is symmetric and satisfies", + "type": "text" + }, + { + "bbox": [ + 395, + 234, + 466, + 245 + ], + "score": 0.91, + "content": "0 \\leq \\mathrm { J S } ( p , q ) \\leq 1", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 234, + 505, + 246 + ], + "score": 1.0, + "content": ". We then", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 103, + 241, + 507, + 262 + ], + "spans": [ + { + "bbox": [ + 103, + 241, + 230, + 262 + ], + "score": 1.0, + "content": "define the coverage as follows:", + "type": "text" + }, + { + "bbox": [ + 230, + 244, + 429, + 259 + ], + "score": 0.87, + "content": "\\begin{array} { r } { \\mathbf { \\bar { c o v e r a g e } } ( S , \\mathbf { y } _ { \\mathcal { O } } ) \\mathbf { \\bar { = } } \\frac { 1 } { | \\mathcal { M } | } \\sum _ { k \\in \\mathcal { M } } ( 1 - \\mathbf { J } \\mathbf { S } ( p _ { k } ^ { - } , q _ { k } ) ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 241, + 507, + 262 + ], + "score": 1.0, + "content": ". If desired, we can", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 256, + 504, + 271 + ], + "spans": [ + { + "bbox": [ + 105, + 256, + 492, + 271 + ], + "score": 1.0, + "content": "combine correctness and coverage into a single number, by computing the JS divergence between", + "type": "text" + }, + { + "bbox": [ + 493, + 260, + 504, + 269 + ], + "score": 0.83, + "content": "p _ { k }", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 268, + 505, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 268, + 123, + 282 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 270, + 134, + 280 + ], + "score": 0.84, + "content": "q _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 268, + 326, + 282 + ], + "score": 1.0, + "content": "for all attributes, where, for observed attributes,", + "type": "text" + }, + { + "bbox": [ + 326, + 270, + 338, + 280 + ], + "score": 0.85, + "content": "p _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 268, + 429, + 282 + ], + "score": 1.0, + "content": "is a delta function and", + "type": "text" + }, + { + "bbox": [ + 429, + 270, + 440, + 280 + ], + "score": 0.85, + "content": "q _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 268, + 505, + 282 + ], + "score": 1.0, + "content": "is the empirical", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 279, + 507, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 279, + 507, + 293 + ], + "score": 1.0, + "content": "distribution (we call this JS-overall). This gives us a convenient way to pick hyperparameters.", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 290, + 452, + 303 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 452, + 303 + ], + "score": 1.0, + "content": "However, for analysis, we find it helpful to report correctness and coverage separately.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 12.5 + }, + { + "type": "text", + "bbox": [ + 108, + 307, + 505, + 341 + ], + "lines": [ + { + "bbox": [ + 105, + 306, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 306, + 506, + 320 + ], + "score": 1.0, + "content": "Note that our metric is different from the inception score proposed in Salimans et al. (2016). That is", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 316, + 505, + 332 + ], + "spans": [ + { + "bbox": [ + 105, + 316, + 222, + 332 + ], + "score": 1.0, + "content": "defined as follows: inception", + "type": "text" + }, + { + "bbox": [ + 222, + 318, + 362, + 331 + ], + "score": 0.87, + "content": "\\underline { { \\mathbf { \\Pi } } } = \\exp \\left( \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\dot { \\mathrm { K L } } ( p ( y | \\mathbf { x } ) , \\dot { p } ( y \\dot { ) } ) \\right] \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 316, + 392, + 332 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 393, + 320, + 399, + 330 + ], + "score": 0.81, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 316, + 505, + 332 + ], + "score": 1.0, + "content": "is a class label. Expanding", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 328, + 264, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 328, + 264, + 342 + ], + "score": 1.0, + "content": "the term inside the exponential, we get", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20 + }, + { + "type": "interline_equation", + "bbox": [ + 124, + 352, + 486, + 388 + ], + "lines": [ + { + "bbox": [ + 124, + 352, + 486, + 388 + ], + "spans": [ + { + "bbox": [ + 124, + 352, + 486, + 388 + ], + "score": 0.93, + "content": "\\sum _ { \\mathbf { x } } p ( \\mathbf { x } ) \\left[ \\sum _ { y } p ( y | \\mathbf { x } ) \\log p ( y | \\mathbf { x } ) \\right] - \\sum _ { \\mathbf { x } } \\sum _ { y } p ( \\mathbf { x } , y ) \\log p ( y ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ - H ( y | \\mathbf { x } ) \\right] + H ( y )", + "type": "interline_equation", + "image_path": "a98aa03c29b19106faddfa6133d74cf9abf429cd79d3f988ddb49cd4843f9643.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 124, + 352, + 486, + 364.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 124, + 364.0, + 486, + 376.0 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 124, + 376.0, + 486, + 388.0 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 399, + 505, + 455 + ], + "lines": [ + { + "bbox": [ + 105, + 400, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 105, + 400, + 308, + 413 + ], + "score": 1.0, + "content": "A high inception score means that the distribution", + "type": "text" + }, + { + "bbox": [ + 309, + 400, + 336, + 412 + ], + "score": 0.93, + "content": "p ( y | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 400, + 505, + 413 + ], + "score": 1.0, + "content": "has low entropy, so the generated images", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 411, + 506, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 267, + 424 + ], + "score": 1.0, + "content": "match some class, but that the marginal", + "type": "text" + }, + { + "bbox": [ + 268, + 411, + 286, + 423 + ], + "score": 0.92, + "content": "p ( y )", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 411, + 506, + 424 + ], + "score": 1.0, + "content": "has high entropy, so the images are diverse. However,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 423, + 505, + 434 + ], + "spans": [ + { + "bbox": [ + 106, + 423, + 505, + 434 + ], + "score": 1.0, + "content": "the inception score was created to evaluate unconditional generative models of images, so it does not", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 433, + 505, + 446 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 356, + 446 + ], + "score": 1.0, + "content": "check if the generated images are consistent with the concept", + "type": "text" + }, + { + "bbox": [ + 356, + 434, + 370, + 444 + ], + "score": 0.85, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 433, + 505, + 446 + ], + "score": 1.0, + "content": ", and the degree of diversity does", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 444, + 354, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 444, + 354, + 457 + ], + "score": 1.0, + "content": "not vary in response to the level of abstraction of the concept.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27 + }, + { + "type": "text", + "bbox": [ + 107, + 460, + 505, + 538 + ], + "lines": [ + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "score": 1.0, + "content": "Finally, we can assess how well the model understands compositionality, by checking correctness", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 471, + 505, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 315, + 484 + ], + "score": 1.0, + "content": "of its generated images in response to test concepts", + "type": "text" + }, + { + "bbox": [ + 315, + 473, + 330, + 483 + ], + "score": 0.87, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 471, + 505, + 484 + ], + "score": 1.0, + "content": "that differ in at least one attribute from the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 483, + 505, + 495 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 505, + 495 + ], + "score": 1.0, + "content": "training concepts. We call this a compositional split of the data. This is much harder than a standard", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 494, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 106, + 494, + 506, + 505 + ], + "score": 1.0, + "content": "iid split, since we are asking the model to predict the effects of novel combinations of attributes,", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 505, + 506, + 517 + ], + "spans": [ + { + "bbox": [ + 106, + 505, + 506, + 517 + ], + "score": 1.0, + "content": "which it has not seen before (and which might actually be impossible). Note that abstraction is", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 516, + 506, + 528 + ], + "spans": [ + { + "bbox": [ + 106, + 516, + 506, + 528 + ], + "score": 1.0, + "content": "different from compositionality – in abstraction we are asking the model to predict the effects of", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 527, + 432, + 540 + ], + "spans": [ + { + "bbox": [ + 106, + 527, + 432, + 540 + ], + "score": 1.0, + "content": "dropping certain attributes instead of predicting novel combinations of attributes.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 33 + }, + { + "type": "title", + "bbox": [ + 108, + 562, + 211, + 574 + ], + "lines": [ + { + "bbox": [ + 105, + 561, + 213, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 213, + 577 + ], + "score": 1.0, + "content": "4 RELATED WORK", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 37 + }, + { + "type": "text", + "bbox": [ + 107, + 591, + 422, + 603 + ], + "lines": [ + { + "bbox": [ + 105, + 590, + 423, + 605 + ], + "spans": [ + { + "bbox": [ + 105, + 590, + 423, + 605 + ], + "score": 1.0, + "content": "In this section, we briefly mention some of the most closely related prior work.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 38 + }, + { + "type": "text", + "bbox": [ + 107, + 623, + 505, + 689 + ], + "lines": [ + { + "bbox": [ + 106, + 622, + 505, + 635 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 431, + 635 + ], + "score": 1.0, + "content": "Conditional models. Many conditional generative image models of the form", + "type": "text" + }, + { + "bbox": [ + 431, + 623, + 460, + 635 + ], + "score": 0.94, + "content": "p ( \\mathbf { y } \\vert \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 622, + 505, + 635 + ], + "score": 1.0, + "content": "have been", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 634, + 506, + 647 + ], + "spans": [ + { + "bbox": [ + 104, + 634, + 506, + 647 + ], + "score": 1.0, + "content": "proposed recently, where y can be a class label (e.g., (Radford et al., 2016)), a vector of attributes", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 645, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 106, + 645, + 506, + 658 + ], + "score": 1.0, + "content": "(e.g., (Yan et al., 2016)), a sentence (e.g., (Reed et al., 2016)), another image (e.g., (Isola et al., 2017)),", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 655, + 506, + 669 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 506, + 669 + ], + "score": 1.0, + "content": "etc. Such models are usually based on VAEs or GANs. However, we are more interested in learning", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 666, + 506, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 506, + 680 + ], + "score": 1.0, + "content": "a shared latent space from either descriptions y or images x, which means we need to use a joint,", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 679, + 183, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 679, + 183, + 689 + ], + "score": 1.0, + "content": "symmetric, model.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 41.5 + }, + { + "type": "text", + "bbox": [ + 106, + 709, + 503, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "Joint models. Several papers use the same joint VAE model as us, but they differ in how it is", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 457, + 733 + ], + "score": 1.0, + "content": "trained. In particular, the BiVCCA objective of Wang et al. (2016b) has the form", + "type": "text" + }, + { + "bbox": [ + 458, + 720, + 505, + 732 + ], + "score": 0.92, + "content": "{ \\mathcal { L } } ( \\theta , \\phi ) =", + "type": "inline_equation" + } + ], + "index": 46 + } + ], + "index": 45.5 + } + ], + "page_idx": 4, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 308, + 760 + ], + "lines": [ + { + "bbox": [ + 302, + 750, + 309, + 763 + ], + "spans": [ + { + "bbox": [ + 302, + 750, + 309, + 763 + ], + "score": 1.0, + "content": "5", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 160 + ], + "lines": [], + "index": 3, + "bbox_fs": [ + 105, + 83, + 506, + 160 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 107, + 165, + 505, + 302 + ], + "lines": [ + { + "bbox": [ + 106, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "To quantify this, we define the correctness as the fraction of attributes for each gener-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 176, + 504, + 190 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 456, + 190 + ], + "score": 1.0, + "content": "ated image that match those specified in the concept’s description: correctness", + "type": "text" + }, + { + "bbox": [ + 456, + 176, + 504, + 188 + ], + "score": 0.86, + "content": "( \\bar { s } , \\mathbf { y } \\bar { \\omega } ) \\ =", + "type": "inline_equation" + } + ], + "index": 8 + }, + { + "bbox": [ + 107, + 186, + 507, + 202 + ], + "spans": [ + { + "bbox": [ + 107, + 186, + 257, + 202 + ], + "score": 0.9, + "content": "\\begin{array} { r } { \\frac { 1 } { | \\mathcal { S } | } \\sum _ { \\mathbf { x } \\in \\mathcal { S } } \\overset { 1 } { \\underset { | \\mathcal { O } | } { \\mid } } \\sum _ { k \\in \\mathcal { O } } \\mathbb { I } ( \\hat { y } ( \\mathbf { x } ) _ { k } = \\overset { \\cdot } { y } _ { k } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 186, + 507, + 201 + ], + "score": 1.0, + "content": ". However, we also want to measure the diversity of values", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 200, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 106, + 201, + 273, + 213 + ], + "score": 1.0, + "content": "for the unspecified or missing attributes,", + "type": "text" + }, + { + "bbox": [ + 273, + 200, + 325, + 213 + ], + "score": 0.92, + "content": "\\mathcal { M } = \\mathcal { A } \\backslash \\mathcal { O }", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 201, + 434, + 213 + ], + "score": 1.0, + "content": ". We do this by comparing", + "type": "text" + }, + { + "bbox": [ + 434, + 203, + 445, + 213 + ], + "score": 0.83, + "content": "q _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 201, + 505, + 213 + ], + "score": 1.0, + "content": ", the empirical", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 211, + 505, + 224 + ], + "spans": [ + { + "bbox": [ + 106, + 211, + 250, + 224 + ], + "score": 1.0, + "content": "distribution over values for attribute", + "type": "text" + }, + { + "bbox": [ + 251, + 212, + 258, + 222 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 211, + 374, + 224 + ], + "score": 1.0, + "content": "induced by the generated set", + "type": "text" + }, + { + "bbox": [ + 374, + 212, + 382, + 222 + ], + "score": 0.79, + "content": "s", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 211, + 396, + 224 + ], + "score": 1.0, + "content": ", to", + "type": "text" + }, + { + "bbox": [ + 396, + 213, + 407, + 223 + ], + "score": 0.85, + "content": "p _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 211, + 505, + 224 + ], + "score": 1.0, + "content": ", the true distribution for", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 222, + 505, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 505, + 235 + ], + "score": 1.0, + "content": "this attribute induced by the training set. We measure the difference between these distributions", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 234, + 505, + 246 + ], + "spans": [ + { + "bbox": [ + 106, + 234, + 395, + 246 + ], + "score": 1.0, + "content": "using the Jensen-Shannon divergence, since it is symmetric and satisfies", + "type": "text" + }, + { + "bbox": [ + 395, + 234, + 466, + 245 + ], + "score": 0.91, + "content": "0 \\leq \\mathrm { J S } ( p , q ) \\leq 1", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 234, + 505, + 246 + ], + "score": 1.0, + "content": ". We then", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 103, + 241, + 507, + 262 + ], + "spans": [ + { + "bbox": [ + 103, + 241, + 230, + 262 + ], + "score": 1.0, + "content": "define the coverage as follows:", + "type": "text" + }, + { + "bbox": [ + 230, + 244, + 429, + 259 + ], + "score": 0.87, + "content": "\\begin{array} { r } { \\mathbf { \\bar { c o v e r a g e } } ( S , \\mathbf { y } _ { \\mathcal { O } } ) \\mathbf { \\bar { = } } \\frac { 1 } { | \\mathcal { M } | } \\sum _ { k \\in \\mathcal { M } } ( 1 - \\mathbf { J } \\mathbf { S } ( p _ { k } ^ { - } , q _ { k } ) ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 241, + 507, + 262 + ], + "score": 1.0, + "content": ". If desired, we can", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 256, + 504, + 271 + ], + "spans": [ + { + "bbox": [ + 105, + 256, + 492, + 271 + ], + "score": 1.0, + "content": "combine correctness and coverage into a single number, by computing the JS divergence between", + "type": "text" + }, + { + "bbox": [ + 493, + 260, + 504, + 269 + ], + "score": 0.83, + "content": "p _ { k }", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 268, + 505, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 268, + 123, + 282 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 270, + 134, + 280 + ], + "score": 0.84, + "content": "q _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 268, + 326, + 282 + ], + "score": 1.0, + "content": "for all attributes, where, for observed attributes,", + "type": "text" + }, + { + "bbox": [ + 326, + 270, + 338, + 280 + ], + "score": 0.85, + "content": "p _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 268, + 429, + 282 + ], + "score": 1.0, + "content": "is a delta function and", + "type": "text" + }, + { + "bbox": [ + 429, + 270, + 440, + 280 + ], + "score": 0.85, + "content": "q _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 440, + 268, + 505, + 282 + ], + "score": 1.0, + "content": "is the empirical", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 279, + 507, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 279, + 507, + 293 + ], + "score": 1.0, + "content": "distribution (we call this JS-overall). This gives us a convenient way to pick hyperparameters.", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 290, + 452, + 303 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 452, + 303 + ], + "score": 1.0, + "content": "However, for analysis, we find it helpful to report correctness and coverage separately.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 12.5, + "bbox_fs": [ + 103, + 165, + 507, + 303 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 307, + 505, + 341 + ], + "lines": [ + { + "bbox": [ + 105, + 306, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 306, + 506, + 320 + ], + "score": 1.0, + "content": "Note that our metric is different from the inception score proposed in Salimans et al. (2016). That is", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 316, + 505, + 332 + ], + "spans": [ + { + "bbox": [ + 105, + 316, + 222, + 332 + ], + "score": 1.0, + "content": "defined as follows: inception", + "type": "text" + }, + { + "bbox": [ + 222, + 318, + 362, + 331 + ], + "score": 0.87, + "content": "\\underline { { \\mathbf { \\Pi } } } = \\exp \\left( \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ \\dot { \\mathrm { K L } } ( p ( y | \\mathbf { x } ) , \\dot { p } ( y \\dot { ) } ) \\right] \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 316, + 392, + 332 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 393, + 320, + 399, + 330 + ], + "score": 0.81, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 316, + 505, + 332 + ], + "score": 1.0, + "content": "is a class label. Expanding", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 328, + 264, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 328, + 264, + 342 + ], + "score": 1.0, + "content": "the term inside the exponential, we get", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20, + "bbox_fs": [ + 105, + 306, + 506, + 342 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 124, + 352, + 486, + 388 + ], + "lines": [ + { + "bbox": [ + 124, + 352, + 486, + 388 + ], + "spans": [ + { + "bbox": [ + 124, + 352, + 486, + 388 + ], + "score": 0.93, + "content": "\\sum _ { \\mathbf { x } } p ( \\mathbf { x } ) \\left[ \\sum _ { y } p ( y | \\mathbf { x } ) \\log p ( y | \\mathbf { x } ) \\right] - \\sum _ { \\mathbf { x } } \\sum _ { y } p ( \\mathbf { x } , y ) \\log p ( y ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } ) } \\left[ - H ( y | \\mathbf { x } ) \\right] + H ( y )", + "type": "interline_equation", + "image_path": "a98aa03c29b19106faddfa6133d74cf9abf429cd79d3f988ddb49cd4843f9643.jpg" + } + ] + } + ], + "index": 23, + "virtual_lines": [ + { + "bbox": [ + 124, + 352, + 486, + 364.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 124, + 364.0, + 486, + 376.0 + ], + "spans": [], + "index": 23 + }, + { + "bbox": [ + 124, + 376.0, + 486, + 388.0 + ], + "spans": [], + "index": 24 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 399, + 505, + 455 + ], + "lines": [ + { + "bbox": [ + 105, + 400, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 105, + 400, + 308, + 413 + ], + "score": 1.0, + "content": "A high inception score means that the distribution", + "type": "text" + }, + { + "bbox": [ + 309, + 400, + 336, + 412 + ], + "score": 0.93, + "content": "p ( y | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 400, + 505, + 413 + ], + "score": 1.0, + "content": "has low entropy, so the generated images", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 411, + 506, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 267, + 424 + ], + "score": 1.0, + "content": "match some class, but that the marginal", + "type": "text" + }, + { + "bbox": [ + 268, + 411, + 286, + 423 + ], + "score": 0.92, + "content": "p ( y )", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 411, + 506, + 424 + ], + "score": 1.0, + "content": "has high entropy, so the images are diverse. However,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 423, + 505, + 434 + ], + "spans": [ + { + "bbox": [ + 106, + 423, + 505, + 434 + ], + "score": 1.0, + "content": "the inception score was created to evaluate unconditional generative models of images, so it does not", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 433, + 505, + 446 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 356, + 446 + ], + "score": 1.0, + "content": "check if the generated images are consistent with the concept", + "type": "text" + }, + { + "bbox": [ + 356, + 434, + 370, + 444 + ], + "score": 0.85, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 433, + 505, + 446 + ], + "score": 1.0, + "content": ", and the degree of diversity does", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 444, + 354, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 444, + 354, + 457 + ], + "score": 1.0, + "content": "not vary in response to the level of abstraction of the concept.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27, + "bbox_fs": [ + 105, + 400, + 506, + 457 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 460, + 505, + 538 + ], + "lines": [ + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "score": 1.0, + "content": "Finally, we can assess how well the model understands compositionality, by checking correctness", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 471, + 505, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 315, + 484 + ], + "score": 1.0, + "content": "of its generated images in response to test concepts", + "type": "text" + }, + { + "bbox": [ + 315, + 473, + 330, + 483 + ], + "score": 0.87, + "content": "\\mathbf { y } _ { \\mathcal { O } }", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 471, + 505, + 484 + ], + "score": 1.0, + "content": "that differ in at least one attribute from the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 483, + 505, + 495 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 505, + 495 + ], + "score": 1.0, + "content": "training concepts. We call this a compositional split of the data. This is much harder than a standard", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 494, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 106, + 494, + 506, + 505 + ], + "score": 1.0, + "content": "iid split, since we are asking the model to predict the effects of novel combinations of attributes,", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 505, + 506, + 517 + ], + "spans": [ + { + "bbox": [ + 106, + 505, + 506, + 517 + ], + "score": 1.0, + "content": "which it has not seen before (and which might actually be impossible). Note that abstraction is", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 516, + 506, + 528 + ], + "spans": [ + { + "bbox": [ + 106, + 516, + 506, + 528 + ], + "score": 1.0, + "content": "different from compositionality – in abstraction we are asking the model to predict the effects of", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 527, + 432, + 540 + ], + "spans": [ + { + "bbox": [ + 106, + 527, + 432, + 540 + ], + "score": 1.0, + "content": "dropping certain attributes instead of predicting novel combinations of attributes.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 33, + "bbox_fs": [ + 105, + 460, + 506, + 540 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 562, + 211, + 574 + ], + "lines": [ + { + "bbox": [ + 105, + 561, + 213, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 213, + 577 + ], + "score": 1.0, + "content": "4 RELATED WORK", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 37 + }, + { + "type": "text", + "bbox": [ + 107, + 591, + 422, + 603 + ], + "lines": [ + { + "bbox": [ + 105, + 590, + 423, + 605 + ], + "spans": [ + { + "bbox": [ + 105, + 590, + 423, + 605 + ], + "score": 1.0, + "content": "In this section, we briefly mention some of the most closely related prior work.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 38, + "bbox_fs": [ + 105, + 590, + 423, + 605 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 623, + 505, + 689 + ], + "lines": [ + { + "bbox": [ + 106, + 622, + 505, + 635 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 431, + 635 + ], + "score": 1.0, + "content": "Conditional models. Many conditional generative image models of the form", + "type": "text" + }, + { + "bbox": [ + 431, + 623, + 460, + 635 + ], + "score": 0.94, + "content": "p ( \\mathbf { y } \\vert \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 622, + 505, + 635 + ], + "score": 1.0, + "content": "have been", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 634, + 506, + 647 + ], + "spans": [ + { + "bbox": [ + 104, + 634, + 506, + 647 + ], + "score": 1.0, + "content": "proposed recently, where y can be a class label (e.g., (Radford et al., 2016)), a vector of attributes", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 645, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 106, + 645, + 506, + 658 + ], + "score": 1.0, + "content": "(e.g., (Yan et al., 2016)), a sentence (e.g., (Reed et al., 2016)), another image (e.g., (Isola et al., 2017)),", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 655, + 506, + 669 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 506, + 669 + ], + "score": 1.0, + "content": "etc. Such models are usually based on VAEs or GANs. However, we are more interested in learning", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 666, + 506, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 506, + 680 + ], + "score": 1.0, + "content": "a shared latent space from either descriptions y or images x, which means we need to use a joint,", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 679, + 183, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 679, + 183, + 689 + ], + "score": 1.0, + "content": "symmetric, model.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 41.5, + "bbox_fs": [ + 104, + 622, + 506, + 689 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 709, + 503, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "Joint models. Several papers use the same joint VAE model as us, but they differ in how it is", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 457, + 733 + ], + "score": 1.0, + "content": "trained. In particular, the BiVCCA objective of Wang et al. (2016b) has the form", + "type": "text" + }, + { + "bbox": [ + 458, + 720, + 505, + 732 + ], + "score": 0.92, + "content": "{ \\mathcal { L } } ( \\theta , \\phi ) =", + "type": "inline_equation" + } + ], + "index": 46 + } + ], + "index": 45.5, + "bbox_fs": [ + 105, + 709, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 227, + 95 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 228, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 197, + 96 + ], + "score": 0.89, + "content": "\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) \\right]", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 82, + 228, + 96 + ], + "score": 1.0, + "content": ", where", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "interline_equation", + "bbox": [ + 129, + 99, + 481, + 145 + ], + "lines": [ + { + "bbox": [ + 129, + 99, + 481, + 145 + ], + "spans": [ + { + "bbox": [ + 129, + 99, + 481, + 145 + ], + "score": 0.92, + "content": "\\begin{array} { r } { J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } , \\phi ) = \\mu \\left( E _ { q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) } [ \\log p \\pmb { \\theta } _ { x } ( \\mathbf { x } | \\mathbf { z } ) + \\lambda \\log p \\pmb { \\theta } _ { y } ( \\mathbf { y } | \\mathbf { z } ) ] - \\mathrm { K L } ( q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) , p \\pmb { \\theta } ( \\mathbf { z } ) ) \\right) } \\\\ { + ( 1 - \\mu ) \\left( E _ { q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) } [ \\log p \\pmb { \\theta } _ { x } ( \\mathbf { x } | \\mathbf { z } ) + \\lambda \\log p \\pmb { \\theta } _ { y } ( \\mathbf { y } | \\mathbf { z } ) ] - \\mathrm { K L } ( q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) , p \\pmb { \\theta } ( \\mathbf { z } ) ) \\right) } \\end{array}", + "type": "interline_equation", + "image_path": "26aa0f6e50485e7596f6c057e3fe5cc6e52fa317e7327910a8b40b6ac7457b5a.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 129, + 99, + 481, + 114.33333333333333 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 129, + 114.33333333333333, + 481, + 129.66666666666666 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 129, + 129.66666666666666, + 481, + 145.0 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 146, + 506, + 206 + ], + "lines": [ + { + "bbox": [ + 105, + 145, + 505, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 145, + 505, + 160 + ], + "score": 1.0, + "content": "This method results in the model generating the mean image corresponding to each concept, due to the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 107, + 157, + 507, + 173 + ], + "spans": [ + { + "bbox": [ + 107, + 158, + 205, + 173 + ], + "score": 0.9, + "content": "E _ { q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) } \\log p _ { \\theta } ( \\mathbf { x } , \\mathbf { y } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 157, + 305, + 172 + ], + "score": 1.0, + "content": "term, which requires that", + "type": "text" + }, + { + "bbox": [ + 305, + 160, + 311, + 168 + ], + "score": 0.61, + "content": "\\mathbf { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 157, + 375, + 172 + ], + "score": 1.0, + "content": "’s sampled from", + "type": "text" + }, + { + "bbox": [ + 375, + 158, + 417, + 172 + ], + "score": 0.95, + "content": "q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { n } )", + "type": "inline_equation" + }, + { + "bbox": [ + 418, + 157, + 507, + 172 + ], + "score": 1.0, + "content": "be good at generating", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 170, + 506, + 184 + ], + "spans": [ + { + "bbox": [ + 105, + 170, + 170, + 184 + ], + "score": 1.0, + "content": "all the different", + "type": "text" + }, + { + "bbox": [ + 170, + 173, + 183, + 182 + ], + "score": 0.85, + "content": "{ \\bf x } _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 170, + 275, + 184 + ], + "score": 1.0, + "content": "’s which co-occur with", + "type": "text" + }, + { + "bbox": [ + 275, + 172, + 288, + 182 + ], + "score": 0.86, + "content": "{ \\bf y } _ { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 170, + 506, + 184 + ], + "score": 1.0, + "content": ". We show this empirically in Section 5. 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Also, they rely on", + "type": "text" + }, + { + "bbox": [ + 413, + 566, + 443, + 577 + ], + "score": 0.91, + "content": "\\beta _ { x } > 1", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 565, + 506, + 578 + ], + "score": 1.0, + "content": "as a way to get", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 576, + 506, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 506, + 589 + ], + "score": 1.0, + "content": "compositionality, assuming that a disentangled latent space will suffice. 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If the aggregated posterior", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 388, + 506, + 401 + ], + "spans": [ + { + "bbox": [ + 106, + 388, + 506, + 401 + ], + "score": 1.0, + "content": "does not exactly match the prior (which is known to happen in VAE-type models, see Hoffman &", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 399, + 505, + 411 + ], + "spans": [ + { + "bbox": [ + 106, + 399, + 505, + 411 + ], + "score": 1.0, + "content": "Johnson (2016)) then regularizing with respect to the prior (as TELBO does) can generate samples in", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 409, + 506, + 423 + ], + "spans": [ + { + "bbox": [ + 104, + 409, + 506, + 423 + ], + "score": 1.0, + "content": "parts of space not seen by the image decoder, which can potentially lead to less “correct” samples.", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 421, + 505, + 434 + ], + "spans": [ + { + "bbox": [ + 105, + 421, + 505, + 434 + ], + "score": 1.0, + "content": "Again, our empirical findings in Section 5 confirm this tradeoff between correctness and coverage", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 432, + 279, + 444 + ], + "spans": [ + { + "bbox": [ + 105, + 432, + 279, + 444 + ], + "score": 1.0, + "content": "implicit in choices of TELBO vs. JMVAE.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 18.5, + "bbox_fs": [ + 104, + 253, + 510, + 444 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 448, + 505, + 498 + ], + "lines": [ + { + "bbox": [ + 105, + 447, + 506, + 462 + ], + "spans": [ + { + "bbox": [ + 105, + 447, + 379, + 462 + ], + "score": 1.0, + "content": "The SCAN method of Higgins et al. 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They then fit a second VAE", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 483, + 375, + 498 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 169, + 498 + ], + "score": 1.0, + "content": "by maximizing", + "type": "text" + }, + { + "bbox": [ + 169, + 483, + 343, + 498 + ], + "score": 0.86, + "content": "\\mathcal { L } ( \\pmb { \\theta } _ { y } , \\pmb { \\phi } _ { y } ) = \\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } , \\phi _ { x } ) \\right]", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 483, + 375, + 498 + ], + "score": 1.0, + "content": ", where", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 28.5, + "bbox_fs": [ + 104, + 447, + 506, + 498 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 158, + 501, + 451, + 516 + ], + "lines": [ + { + "bbox": [ + 158, + 501, + 451, + 516 + ], + "spans": [ + { + "bbox": [ + 158, + 501, + 451, + 516 + ], + "score": 0.82, + "content": "J ( \\mathbf { x } , \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } , \\phi _ { x } ) = \\mathrm { { e l b o } } _ { 1 , \\beta _ { y } } ( \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } ) - \\alpha \\mathrm { { K L } } ( q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) )", + "type": "interline_equation", + "image_path": "ed07a8dc052c068858b2fe6cc0170be15c6fa425ccdbdeede77644a0f3d80493.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 158, + 501, + 451, + 516 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 521, + 506, + 642 + ], + "lines": [ + { + "bbox": [ + 105, + 521, + 506, + 535 + ], + "spans": [ + { + "bbox": [ + 105, + 521, + 263, + 535 + ], + "score": 1.0, + "content": "This is very similar to JMVAE, since", + "type": "text" + }, + { + "bbox": [ + 263, + 521, + 359, + 534 + ], + "score": 0.93, + "content": "q _ { \\phi _ { x } } ( \\mathbf { z } | \\mathbf { x } ) \\approx q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 360, + 521, + 389, + 535 + ], + "score": 1.0, + "content": ", when", + "type": "text" + }, + { + "bbox": [ + 390, + 522, + 414, + 534 + ], + "score": 0.92, + "content": "\\displaystyle ( \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 521, + 506, + 535 + ], + "score": 1.0, + "content": "is a matching pair of", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 532, + 504, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 496, + 546 + ], + "score": 1.0, + "content": "images and labels. An important difference, however, is that SCAN treats the attribute vectors", + "type": "text" + }, + { + "bbox": [ + 497, + 534, + 504, + 544 + ], + "score": 0.28, + "content": "\\mathbf { y }", + "type": "inline_equation" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 543, + 506, + 556 + ], + "spans": [ + { + "bbox": [ + 106, + 543, + 506, + 556 + ], + "score": 1.0, + "content": "as atomic symbols; this has the advantage that there is no need to handle missing inputs, but the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 554, + 506, + 567 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 506, + 567 + ], + "score": 1.0, + "content": "disadvantage that they cannot infer the meaning of unseen attribute combinations at test time, unless", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 565, + 506, + 578 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 413, + 578 + ], + "score": 1.0, + "content": "they are “taught” them by having them paired with images. Also, they rely on", + "type": "text" + }, + { + "bbox": [ + 413, + 566, + 443, + 577 + ], + "score": 0.91, + "content": "\\beta _ { x } > 1", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 565, + 506, + 578 + ], + "score": 1.0, + "content": "as a way to get", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 576, + 506, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 506, + 589 + ], + "score": 1.0, + "content": "compositionality, assuming that a disentangled latent space will suffice. However, in Appendix A.3,", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 587, + 505, + 600 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 505, + 600 + ], + "score": 1.0, + "content": "we show that unsupervised learning of the latent space given images alone can result in poor results", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 598, + 506, + 611 + ], + "spans": [ + { + "bbox": [ + 105, + 598, + 506, + 611 + ], + "score": 1.0, + "content": "when some of the attributes in the compositional concept hierarchy are non-visual, such as parity of", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 610, + 505, + 622 + ], + "spans": [ + { + "bbox": [ + 106, + 610, + 505, + 622 + ], + "score": 1.0, + "content": "an MNIST digit. Our approach always takes the labels into consideration when learning the latent", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 620, + 506, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 620, + 506, + 633 + ], + "score": 1.0, + "content": "space, permitting well-organized latent spaces even in the presence of non-visual concepts (c.f. the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 631, + 252, + 643 + ], + "spans": [ + { + "bbox": [ + 106, + 631, + 252, + 643 + ], + "score": 1.0, + "content": "difference between PCA and LDA).", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 37, + "bbox_fs": [ + 105, + 521, + 506, + 643 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 654, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 654, + 505, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 450, + 668 + ], + "score": 1.0, + "content": "Handling missing inputs. Conditional generative models of images, of the form", + "type": "text" + }, + { + "bbox": [ + 450, + 655, + 479, + 667 + ], + "score": 0.92, + "content": "p ( \\mathbf { x } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 479, + 654, + 505, + 668 + ], + "score": 1.0, + "content": ", have", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 666, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 366, + 678 + ], + "score": 1.0, + "content": "problems with missing input attributes, as do inference networks", + "type": "text" + }, + { + "bbox": [ + 367, + 666, + 394, + 677 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 666, + 506, + 678 + ], + "score": 1.0, + "content": "for VAEs. Hoffman (2017)", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 676, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 506, + 690 + ], + "score": 1.0, + "content": "uses MCMC to fit a latent Gaussian model, which can in principle handle missing data; however,", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 688, + 504, + 699 + ], + "spans": [ + { + "bbox": [ + 106, + 688, + 504, + 699 + ], + "score": 1.0, + "content": "he initializes the Markov chain with the posterior mode computed by an inference network, which", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 699, + 505, + 712 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 712 + ], + "score": 1.0, + "content": "cannot easily handle missing inputs. One approach we can use, if we have a joint model, is to estimate", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 709, + 506, + 724 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 277, + 724 + ], + "score": 1.0, + "content": "or impute the missing values, as follows:", + "type": "text" + }, + { + "bbox": [ + 277, + 710, + 392, + 722 + ], + "score": 0.91, + "content": "\\hat { \\mathbf { y } } = \\arg \\operatorname* { m a x } _ { \\mathbf { y } _ { \\mathcal { M } } } p ( \\mathbf { y } _ { \\mathcal { M } } | \\mathbf { y } _ { \\mathcal { O } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 709, + 424, + 724 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 424, + 710, + 471, + 722 + ], + "score": 0.92, + "content": "p ( \\mathbf { y } _ { \\mathcal { M } } , \\mathbf { y } _ { \\mathcal { O } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 471, + 709, + 506, + 724 + ], + "score": 1.0, + "content": "models", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 106, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 389, + 733 + ], + "score": 1.0, + "content": "dependencies between attributes. We can then sample images using", + "type": "text" + }, + { + "bbox": [ + 390, + 721, + 419, + 732 + ], + "score": 0.92, + "content": "p ( \\mathbf { x } | \\hat { \\mathbf { y } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 720, + 505, + 733 + ], + "score": 1.0, + "content": ". This approach was", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 82, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 506, + 95 + ], + "score": 1.0, + "content": "used in Yan et al. (2016) to handle the case where some of the pixels being passed into an inference", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "score": 1.0, + "content": "network were not observed. However, conditioning on an imputed value will give different results", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "from not conditioning on the missing inputs; only the latter will increase the posterior uncertainty in", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 116, + 390, + 128 + ], + "spans": [ + { + "bbox": [ + 106, + 116, + 390, + 128 + ], + "score": 1.0, + "content": "order to correctly represent less precise concepts with broader support.", + "type": "text", + "cross_page": true + } + ], + "index": 3 + } + ], + "index": 46, + "bbox_fs": [ + 105, + 654, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 504, + 126 + ], + "lines": [ + { + "bbox": [ + 105, + 82, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 506, + 95 + ], + "score": 1.0, + "content": "used in Yan et al. (2016) to handle the case where some of the pixels being passed into an inference", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "score": 1.0, + "content": "network were not observed. However, conditioning on an imputed value will give different results", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "from not conditioning on the missing inputs; only the latter will increase the posterior uncertainty in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 116, + 390, + 128 + ], + "spans": [ + { + "bbox": [ + 106, + 116, + 390, + 128 + ], + "score": 1.0, + "content": "order to correctly represent less precise concepts with broader support.", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5 + }, + { + "type": "text", + "bbox": [ + 107, + 140, + 505, + 250 + ], + "lines": [ + { + "bbox": [ + 106, + 140, + 506, + 153 + ], + "spans": [ + { + "bbox": [ + 106, + 140, + 506, + 153 + ], + "score": 1.0, + "content": "Gaussian embeddings. There are many papers that embed images and text into points in a vector", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 150, + 506, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 150, + 506, + 163 + ], + "score": 1.0, + "content": "space. However, we want to represent concepts of different levels of abstraction, and therefore want", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 162, + 506, + 175 + ], + "spans": [ + { + "bbox": [ + 105, + 162, + 506, + 175 + ], + "score": 1.0, + "content": "to map images and text to regions of latent space. There are some prior works that use Gaussian", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 172, + 505, + 185 + ], + "spans": [ + { + "bbox": [ + 105, + 172, + 505, + 185 + ], + "score": 1.0, + "content": "embeddings for words (Vilnis & McCallum, 2015; Athiwaratkun & Wilson, 2017), sometimes in", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 183, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 183, + 505, + 196 + ], + "score": 1.0, + "content": "conjunction with images (Mukherjee & Hospedales, 2016; Ren et al., 2016). Our method differs", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 195, + 505, + 208 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 406, + 208 + ], + "score": 1.0, + "content": "from these approaches in several ways. First, we maximize the likelihood of", + "type": "text" + }, + { + "bbox": [ + 406, + 195, + 431, + 207 + ], + "score": 0.91, + "content": "\\displaystyle ( \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 195, + 505, + 208 + ], + "score": 1.0, + "content": "pairs, whereas the", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 206, + 505, + 219 + ], + "spans": [ + { + "bbox": [ + 105, + 206, + 505, + 219 + ], + "score": 1.0, + "content": "above methods learn a Gaussian embedding using a contrastive loss. Second, our PoE formulation", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 217, + 505, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 281, + 230 + ], + "score": 1.0, + "content": "ensures that the covariance of the posterior", + "type": "text" + }, + { + "bbox": [ + 281, + 217, + 315, + 229 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 217, + 505, + 230 + ], + "score": 1.0, + "content": "is adaptive to the data that we condition on. In", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 228, + 506, + 240 + ], + "spans": [ + { + "bbox": [ + 105, + 228, + 506, + 240 + ], + "score": 1.0, + "content": "particular, it becomes narrower as we observe more attributes (because the precision matrices sum", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 239, + 368, + 251 + ], + "spans": [ + { + "bbox": [ + 105, + 239, + 368, + 251 + ], + "score": 1.0, + "content": "up), which is a property not shared by other embedding methods.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 8.5 + }, + { + "type": "text", + "bbox": [ + 107, + 263, + 505, + 373 + ], + "lines": [ + { + "bbox": [ + 106, + 263, + 505, + 275 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 505, + 275 + ], + "score": 1.0, + "content": "Abstraction and compositionality. Young et al. (2014) represent the extension of a concept", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 274, + 506, + 286 + ], + "spans": [ + { + "bbox": [ + 106, + 274, + 506, + 286 + ], + "score": 1.0, + "content": "(described by a noun phrase) in terms of a set of images whose captions match the phrase. By contrast,", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 285, + 505, + 297 + ], + "spans": [ + { + "bbox": [ + 105, + 285, + 505, + 297 + ], + "score": 1.0, + "content": "we use a parametric probability distribution in a latent space that can generate new images. Vendrov", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 295, + 506, + 310 + ], + "spans": [ + { + "bbox": [ + 104, + 295, + 506, + 310 + ], + "score": 1.0, + "content": "et al. (2016) use order embeddings, where they explicitly learn subsumption-like relationships by", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 308, + 505, + 319 + ], + "spans": [ + { + "bbox": [ + 106, + 308, + 505, + 319 + ], + "score": 1.0, + "content": "learning a space that respects a partial order. In contrast, we reason about generality of concepts via", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 318, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 505, + 331 + ], + "score": 1.0, + "content": "the uncertainty induced by their latent representation. There has been some work on compositionality", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 329, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 105, + 329, + 506, + 342 + ], + "score": 1.0, + "content": "in the language/vision literature (see e.g., Atzmon et al. (2016); Johnson et al. (2017); Agrawal et al.", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 339, + 506, + 353 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 506, + 353 + ], + "score": 1.0, + "content": "(2017)), but none of these papers use generative models, which is arguably a much more stringent", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 349, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 349, + 505, + 365 + ], + "score": 1.0, + "content": "test of whether a model has truly “understood” the meaning of the components which are being", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 362, + 152, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 152, + 375 + ], + "score": 1.0, + "content": "composed.", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 18.5 + }, + { + "type": "title", + "bbox": [ + 108, + 390, + 254, + 403 + ], + "lines": [ + { + "bbox": [ + 105, + 389, + 256, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 256, + 405 + ], + "score": 1.0, + "content": "5 EXPERIMENTAL RESULTS", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 416, + 505, + 460 + ], + "lines": [ + { + "bbox": [ + 105, + 415, + 505, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 505, + 429 + ], + "score": 1.0, + "content": "In this section, we fit the JVAE model to two different datasets (MNIST-A and CelebA), using", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 426, + 505, + 440 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 505, + 440 + ], + "score": 1.0, + "content": "the TELBO objective, as well as BiVCCA and JMVAE. We measure the quality of the resulting", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 438, + 505, + 451 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 505, + 451 + ], + "score": 1.0, + "content": "model using the 3 C’s, and show that our method of handling missing data behaves in a qualitatively", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 448, + 173, + 462 + ], + "spans": [ + { + "bbox": [ + 105, + 448, + 173, + 462 + ], + "score": 1.0, + "content": "reasonable way.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 26.5 + }, + { + "type": "title", + "bbox": [ + 107, + 474, + 176, + 486 + ], + "lines": [ + { + "bbox": [ + 105, + 474, + 177, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 474, + 177, + 488 + ], + "score": 1.0, + "content": "5.1 MNIST-A", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 107, + 495, + 505, + 562 + ], + "lines": [ + { + "bbox": [ + 105, + 494, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 105, + 494, + 505, + 509 + ], + "score": 1.0, + "content": "Dataset. In this section, we report results on the MNIST-A dataset. This is created by modifying", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 506, + 506, + 519 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 506, + 519 + ], + "score": 1.0, + "content": "the original MNIST dataset as follows. We first create a compositional concept hierarchy using 4", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 517, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 106, + 517, + 506, + 531 + ], + "score": 1.0, + "content": "discrete attributes, corresponding to class label (10 values), location (4 values), orientation (3 values),", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 528, + 504, + 541 + ], + "spans": [ + { + "bbox": [ + 106, + 528, + 242, + 541 + ], + "score": 1.0, + "content": "and size (2 values). Thus there are", + "type": "text" + }, + { + "bbox": [ + 242, + 529, + 315, + 540 + ], + "score": 0.9, + "content": "1 0 { \\times } 2 { \\times } 3 { \\times } 4 = 2 4 0", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 528, + 477, + 541 + ], + "score": 1.0, + "content": "unique concepts in total. We then sample", + "type": "text" + }, + { + "bbox": [ + 477, + 529, + 504, + 540 + ], + "score": 0.83, + "content": "\\sim 2 9 0", + "type": "inline_equation" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "score": 1.0, + "content": "example images of each concept, and create both an iid and compositional split of the data. See", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 551, + 210, + 563 + ], + "spans": [ + { + "bbox": [ + 106, + 551, + 210, + 563 + ], + "score": 1.0, + "content": "Appendix A.2 for details.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 32.5 + }, + { + "type": "text", + "bbox": [ + 106, + 575, + 505, + 696 + ], + "lines": [ + { + "bbox": [ + 106, + 575, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 575, + 506, + 587 + ], + "score": 1.0, + "content": "Models and algorithms. We train the JVAE model on this dataset using TELBO, BiVCCA and", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 586, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 586, + 506, + 598 + ], + "score": 1.0, + "content": "JMVAE objectives. We use Adam (Kingma & Ba, 2015) for optimization, with a learning rate of", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 596, + 505, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 505, + 609 + ], + "score": 1.0, + "content": "0.0001, and a minibatch size of 64. We train all models for 250,000 steps (we generally found that the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 609, + 505, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 609, + 505, + 620 + ], + "score": 1.0, + "content": "models do not tend to overfit in our experiments). Our models typically take around a day to train on", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 619, + 506, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 619, + 296, + 631 + ], + "score": 1.0, + "content": "NVIDIA Titan X GPUs. For the image models,", + "type": "text" + }, + { + "bbox": [ + 297, + 619, + 325, + 631 + ], + "score": 0.94, + "content": "p ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 619, + 342, + 631 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 343, + 619, + 370, + 631 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 619, + 506, + 631 + ], + "score": 1.0, + "content": ", we use the DCGAN architecture", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 630, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 105, + 630, + 348, + 642 + ], + "score": 1.0, + "content": "from Radford et al. (2016). Our generated images are of size", + "type": "text" + }, + { + "bbox": [ + 348, + 631, + 376, + 641 + ], + "score": 0.89, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 630, + 506, + 642 + ], + "score": 1.0, + "content": ", as in Radford et al. (2016). For", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 640, + 506, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 190, + 654 + ], + "score": 1.0, + "content": "the attribute models,", + "type": "text" + }, + { + "bbox": [ + 191, + 641, + 222, + 653 + ], + "score": 0.93, + "content": "p ( y _ { k } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 222, + 640, + 240, + 654 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 240, + 641, + 271, + 653 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | y _ { k } )", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 640, + 464, + 654 + ], + "score": 1.0, + "content": ", we use MLPs. For the joint inference network,", + "type": "text" + }, + { + "bbox": [ + 464, + 641, + 502, + 653 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 640, + 506, + 654 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 652, + 506, + 664 + ], + "spans": [ + { + "bbox": [ + 105, + 652, + 295, + 664 + ], + "score": 1.0, + "content": "we use a CNN combined with an MLP. We use", + "type": "text" + }, + { + "bbox": [ + 295, + 652, + 326, + 662 + ], + "score": 0.9, + "content": "d = 1 0", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 652, + 506, + 664 + ], + "score": 1.0, + "content": "latent dimensions for all models. We choose", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 663, + 506, + 675 + ], + "spans": [ + { + "bbox": [ + 106, + 663, + 506, + 675 + ], + "score": 1.0, + "content": "the hyperparameters for each method so as to maximize JS-overall, which is an overall measure of", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 674, + 506, + 686 + ], + "spans": [ + { + "bbox": [ + 105, + 674, + 506, + 686 + ], + "score": 1.0, + "content": "correctness and coverage (see Section 3) on a validation set of attribute queries. See Appendix A.4", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 684, + 289, + 696 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 289, + 696 + ], + "score": 1.0, + "content": "for further details on the model architectures.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 107, + 710, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "Evaluation. To measure correctness and coverage, we first train the observation classifier on the", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 720, + 505, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 292, + 732 + ], + "score": 1.0, + "content": "full iid dataset, where it gets to an accuracy of", + "type": "text" + }, + { + "bbox": [ + 293, + 721, + 324, + 731 + ], + "score": 0.88, + "content": "9 1 . 1 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 720, + 385, + 732 + ], + "score": 1.0, + "content": "for class label,", + "type": "text" + }, + { + "bbox": [ + 386, + 721, + 418, + 731 + ], + "score": 0.87, + "content": "9 0 . 5 6 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 418, + 720, + 458, + 732 + ], + "score": 1.0, + "content": "for scale,", + "type": "text" + }, + { + "bbox": [ + 458, + 721, + 490, + 731 + ], + "score": 0.86, + "content": "9 2 . 2 3 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 490, + 720, + 505, + 732 + ], + "score": 1.0, + "content": "for", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 47.5 + } + ], + "page_idx": 6, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 308, + 759 + ], + "lines": [ + { + "bbox": [ + 302, + 750, + 309, + 762 + ], + "spans": [ + { + "bbox": [ + 302, + 750, + 309, + 762 + ], + "score": 1.0, + "content": "7", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 504, + 126 + ], + "lines": [], + "index": 1.5, + "bbox_fs": [ + 105, + 82, + 506, + 128 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 107, + 140, + 505, + 250 + ], + "lines": [ + { + "bbox": [ + 106, + 140, + 506, + 153 + ], + "spans": [ + { + "bbox": [ + 106, + 140, + 506, + 153 + ], + "score": 1.0, + "content": "Gaussian embeddings. There are many papers that embed images and text into points in a vector", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 150, + 506, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 150, + 506, + 163 + ], + "score": 1.0, + "content": "space. However, we want to represent concepts of different levels of abstraction, and therefore want", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 162, + 506, + 175 + ], + "spans": [ + { + "bbox": [ + 105, + 162, + 506, + 175 + ], + "score": 1.0, + "content": "to map images and text to regions of latent space. There are some prior works that use Gaussian", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 172, + 505, + 185 + ], + "spans": [ + { + "bbox": [ + 105, + 172, + 505, + 185 + ], + "score": 1.0, + "content": "embeddings for words (Vilnis & McCallum, 2015; Athiwaratkun & Wilson, 2017), sometimes in", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 183, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 183, + 505, + 196 + ], + "score": 1.0, + "content": "conjunction with images (Mukherjee & Hospedales, 2016; Ren et al., 2016). Our method differs", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 195, + 505, + 208 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 406, + 208 + ], + "score": 1.0, + "content": "from these approaches in several ways. First, we maximize the likelihood of", + "type": "text" + }, + { + "bbox": [ + 406, + 195, + 431, + 207 + ], + "score": 0.91, + "content": "\\displaystyle ( \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 431, + 195, + 505, + 208 + ], + "score": 1.0, + "content": "pairs, whereas the", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 206, + 505, + 219 + ], + "spans": [ + { + "bbox": [ + 105, + 206, + 505, + 219 + ], + "score": 1.0, + "content": "above methods learn a Gaussian embedding using a contrastive loss. Second, our PoE formulation", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 217, + 505, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 281, + 230 + ], + "score": 1.0, + "content": "ensures that the covariance of the posterior", + "type": "text" + }, + { + "bbox": [ + 281, + 217, + 315, + 229 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathbf { y } _ { \\mathcal { O } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 217, + 505, + 230 + ], + "score": 1.0, + "content": "is adaptive to the data that we condition on. In", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 228, + 506, + 240 + ], + "spans": [ + { + "bbox": [ + 105, + 228, + 506, + 240 + ], + "score": 1.0, + "content": "particular, it becomes narrower as we observe more attributes (because the precision matrices sum", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 239, + 368, + 251 + ], + "spans": [ + { + "bbox": [ + 105, + 239, + 368, + 251 + ], + "score": 1.0, + "content": "up), which is a property not shared by other embedding methods.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 8.5, + "bbox_fs": [ + 105, + 140, + 506, + 251 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 263, + 505, + 373 + ], + "lines": [ + { + "bbox": [ + 106, + 263, + 505, + 275 + ], + "spans": [ + { + "bbox": [ + 106, + 263, + 505, + 275 + ], + "score": 1.0, + "content": "Abstraction and compositionality. Young et al. (2014) represent the extension of a concept", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 274, + 506, + 286 + ], + "spans": [ + { + "bbox": [ + 106, + 274, + 506, + 286 + ], + "score": 1.0, + "content": "(described by a noun phrase) in terms of a set of images whose captions match the phrase. By contrast,", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 285, + 505, + 297 + ], + "spans": [ + { + "bbox": [ + 105, + 285, + 505, + 297 + ], + "score": 1.0, + "content": "we use a parametric probability distribution in a latent space that can generate new images. Vendrov", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 295, + 506, + 310 + ], + "spans": [ + { + "bbox": [ + 104, + 295, + 506, + 310 + ], + "score": 1.0, + "content": "et al. (2016) use order embeddings, where they explicitly learn subsumption-like relationships by", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 308, + 505, + 319 + ], + "spans": [ + { + "bbox": [ + 106, + 308, + 505, + 319 + ], + "score": 1.0, + "content": "learning a space that respects a partial order. In contrast, we reason about generality of concepts via", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 318, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 505, + 331 + ], + "score": 1.0, + "content": "the uncertainty induced by their latent representation. There has been some work on compositionality", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 329, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 105, + 329, + 506, + 342 + ], + "score": 1.0, + "content": "in the language/vision literature (see e.g., Atzmon et al. (2016); Johnson et al. (2017); Agrawal et al.", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 339, + 506, + 353 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 506, + 353 + ], + "score": 1.0, + "content": "(2017)), but none of these papers use generative models, which is arguably a much more stringent", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 349, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 349, + 505, + 365 + ], + "score": 1.0, + "content": "test of whether a model has truly “understood” the meaning of the components which are being", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 362, + 152, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 152, + 375 + ], + "score": 1.0, + "content": "composed.", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 18.5, + "bbox_fs": [ + 104, + 263, + 506, + 375 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 390, + 254, + 403 + ], + "lines": [ + { + "bbox": [ + 105, + 389, + 256, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 256, + 405 + ], + "score": 1.0, + "content": "5 EXPERIMENTAL RESULTS", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 416, + 505, + 460 + ], + "lines": [ + { + "bbox": [ + 105, + 415, + 505, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 505, + 429 + ], + "score": 1.0, + "content": "In this section, we fit the JVAE model to two different datasets (MNIST-A and CelebA), using", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 426, + 505, + 440 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 505, + 440 + ], + "score": 1.0, + "content": "the TELBO objective, as well as BiVCCA and JMVAE. We measure the quality of the resulting", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 438, + 505, + 451 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 505, + 451 + ], + "score": 1.0, + "content": "model using the 3 C’s, and show that our method of handling missing data behaves in a qualitatively", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 448, + 173, + 462 + ], + "spans": [ + { + "bbox": [ + 105, + 448, + 173, + 462 + ], + "score": 1.0, + "content": "reasonable way.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 26.5, + "bbox_fs": [ + 105, + 415, + 505, + 462 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 474, + 176, + 486 + ], + "lines": [ + { + "bbox": [ + 105, + 474, + 177, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 474, + 177, + 488 + ], + "score": 1.0, + "content": "5.1 MNIST-A", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 107, + 495, + 505, + 562 + ], + "lines": [ + { + "bbox": [ + 105, + 494, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 105, + 494, + 505, + 509 + ], + "score": 1.0, + "content": "Dataset. In this section, we report results on the MNIST-A dataset. This is created by modifying", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 506, + 506, + 519 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 506, + 519 + ], + "score": 1.0, + "content": "the original MNIST dataset as follows. We first create a compositional concept hierarchy using 4", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 517, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 106, + 517, + 506, + 531 + ], + "score": 1.0, + "content": "discrete attributes, corresponding to class label (10 values), location (4 values), orientation (3 values),", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 528, + 504, + 541 + ], + "spans": [ + { + "bbox": [ + 106, + 528, + 242, + 541 + ], + "score": 1.0, + "content": "and size (2 values). Thus there are", + "type": "text" + }, + { + "bbox": [ + 242, + 529, + 315, + 540 + ], + "score": 0.9, + "content": "1 0 { \\times } 2 { \\times } 3 { \\times } 4 = 2 4 0", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 528, + 477, + 541 + ], + "score": 1.0, + "content": "unique concepts in total. We then sample", + "type": "text" + }, + { + "bbox": [ + 477, + 529, + 504, + 540 + ], + "score": 0.83, + "content": "\\sim 2 9 0", + "type": "inline_equation" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "score": 1.0, + "content": "example images of each concept, and create both an iid and compositional split of the data. See", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 551, + 210, + 563 + ], + "spans": [ + { + "bbox": [ + 106, + 551, + 210, + 563 + ], + "score": 1.0, + "content": "Appendix A.2 for details.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 32.5, + "bbox_fs": [ + 105, + 494, + 506, + 563 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 575, + 505, + 696 + ], + "lines": [ + { + "bbox": [ + 106, + 575, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 575, + 506, + 587 + ], + "score": 1.0, + "content": "Models and algorithms. We train the JVAE model on this dataset using TELBO, BiVCCA and", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 586, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 586, + 506, + 598 + ], + "score": 1.0, + "content": "JMVAE objectives. We use Adam (Kingma & Ba, 2015) for optimization, with a learning rate of", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 596, + 505, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 505, + 609 + ], + "score": 1.0, + "content": "0.0001, and a minibatch size of 64. We train all models for 250,000 steps (we generally found that the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 609, + 505, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 609, + 505, + 620 + ], + "score": 1.0, + "content": "models do not tend to overfit in our experiments). Our models typically take around a day to train on", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 619, + 506, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 619, + 296, + 631 + ], + "score": 1.0, + "content": "NVIDIA Titan X GPUs. For the image models,", + "type": "text" + }, + { + "bbox": [ + 297, + 619, + 325, + 631 + ], + "score": 0.94, + "content": "p ( \\mathbf { x } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 619, + 342, + 631 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 343, + 619, + 370, + 631 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 619, + 506, + 631 + ], + "score": 1.0, + "content": ", we use the DCGAN architecture", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 630, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 105, + 630, + 348, + 642 + ], + "score": 1.0, + "content": "from Radford et al. (2016). Our generated images are of size", + "type": "text" + }, + { + "bbox": [ + 348, + 631, + 376, + 641 + ], + "score": 0.89, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 630, + 506, + 642 + ], + "score": 1.0, + "content": ", as in Radford et al. (2016). For", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 640, + 506, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 190, + 654 + ], + "score": 1.0, + "content": "the attribute models,", + "type": "text" + }, + { + "bbox": [ + 191, + 641, + 222, + 653 + ], + "score": 0.93, + "content": "p ( y _ { k } | \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 222, + 640, + 240, + 654 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 240, + 641, + 271, + 653 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | y _ { k } )", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 640, + 464, + 654 + ], + "score": 1.0, + "content": ", we use MLPs. For the joint inference network,", + "type": "text" + }, + { + "bbox": [ + 464, + 641, + 502, + 653 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 640, + 506, + 654 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 652, + 506, + 664 + ], + "spans": [ + { + "bbox": [ + 105, + 652, + 295, + 664 + ], + "score": 1.0, + "content": "we use a CNN combined with an MLP. We use", + "type": "text" + }, + { + "bbox": [ + 295, + 652, + 326, + 662 + ], + "score": 0.9, + "content": "d = 1 0", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 652, + 506, + 664 + ], + "score": 1.0, + "content": "latent dimensions for all models. We choose", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 663, + 506, + 675 + ], + "spans": [ + { + "bbox": [ + 106, + 663, + 506, + 675 + ], + "score": 1.0, + "content": "the hyperparameters for each method so as to maximize JS-overall, which is an overall measure of", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 674, + 506, + 686 + ], + "spans": [ + { + "bbox": [ + 105, + 674, + 506, + 686 + ], + "score": 1.0, + "content": "correctness and coverage (see Section 3) on a validation set of attribute queries. See Appendix A.4", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 684, + 289, + 696 + ], + "spans": [ + { + "bbox": [ + 105, + 684, + 289, + 696 + ], + "score": 1.0, + "content": "for further details on the model architectures.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 41, + "bbox_fs": [ + 105, + 575, + 506, + 696 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 710, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "Evaluation. To measure correctness and coverage, we first train the observation classifier on the", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 720, + 505, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 292, + 732 + ], + "score": 1.0, + "content": "full iid dataset, where it gets to an accuracy of", + "type": "text" + }, + { + "bbox": [ + 293, + 721, + 324, + 731 + ], + "score": 0.88, + "content": "9 1 . 1 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 325, + 720, + 385, + 732 + ], + "score": 1.0, + "content": "for class label,", + "type": "text" + }, + { + "bbox": [ + 386, + 721, + 418, + 731 + ], + "score": 0.87, + "content": "9 0 . 5 6 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 418, + 720, + 458, + 732 + ], + "score": 1.0, + "content": "for scale,", + "type": "text" + }, + { + "bbox": [ + 458, + 721, + 490, + 731 + ], + "score": 0.86, + "content": "9 2 . 2 3 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 490, + 720, + 505, + 732 + ], + "score": 1.0, + "content": "for", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 270, + 505, + 284 + ], + "spans": [ + { + "bbox": [ + 105, + 270, + 171, + 284 + ], + "score": 1.0, + "content": "orientation, and", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 171, + 271, + 195, + 282 + ], + "score": 0.87, + "content": "100 \\%", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 195, + 270, + 505, + 284 + ], + "score": 1.0, + "content": "for location. Consequently, it is a reliable way to assess the quality of samples", + "type": "text", + "cross_page": true + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 282, + 505, + 294 + ], + "spans": [ + { + "bbox": [ + 105, + 282, + 505, + 294 + ], + "score": 1.0, + "content": "from various generative models (see Appendix A.5 for details). We then compute correctness and", + "type": "text", + "cross_page": true + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 293, + 357, + 306 + ], + "spans": [ + { + "bbox": [ + 106, + 293, + 357, + 306 + ], + "score": 1.0, + "content": "coverage on the iid dataset, and coverage on the comp dataset.", + "type": "text", + "cross_page": true + } + ], + "index": 10 + } + ], + "index": 47.5, + "bbox_fs": [ + 105, + 709, + 505, + 732 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 113, + 102, + 500, + 204 + ], + "blocks": [ + { + "type": "image_caption", + "bbox": [ + 109, + 84, + 252, + 95 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 109, + 84, + 252, + 97 + ], + "spans": [ + { + "bbox": [ + 109, + 84, + 252, + 97 + ], + "score": 1.0, + "content": "Query: 0, small, clockwise, top-right", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "image_body", + "bbox": [ + 113, + 102, + 500, + 204 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 113, + 102, + 500, + 204 + ], + "spans": [ + { + "bbox": [ + 113, + 102, + 500, + 204 + ], + "score": 0.967, + "type": "image", + "image_path": "216614ff4d58de7325957c620c11d08b9ac4d0b78fb017fed0bf9166d2831af1.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 113, + 102, + 500, + 136.0 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 113, + 136.0, + 500, + 170.0 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 113, + 170.0, + 500, + 204.0 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 217, + 505, + 257 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 216, + 506, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 506, + 229 + ], + "score": 1.0, + "content": "Figure 3: Samples from attribute vectors seen at training time, generated by the 3 different models. We plot", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 226, + 506, + 239 + ], + "spans": [ + { + "bbox": [ + 105, + 226, + 228, + 239 + ], + "score": 1.0, + "content": "the posterior mean of each pixel,", + "type": "text" + }, + { + "bbox": [ + 229, + 227, + 260, + 237 + ], + "score": 0.87, + "content": "\\mathbb { E } \\left[ \\mathbf { x } | \\mathbf { z } _ { s } \\right]", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 226, + 288, + 239 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 288, + 227, + 345, + 239 + ], + "score": 0.93, + "content": "\\mathbf { z } _ { s } \\sim \\hat { q } _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 226, + 506, + 239 + ], + "score": 1.0, + "content": ". The caption at the top of each little image", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 236, + 505, + 248 + ], + "spans": [ + { + "bbox": [ + 105, + 236, + 505, + 248 + ], + "score": 1.0, + "content": "is the predicted attribute values. The border of the generated image is red if any of the attributes are predicted", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 246, + 501, + 258 + ], + "spans": [ + { + "bbox": [ + 106, + 246, + 501, + 258 + ], + "score": 1.0, + "content": "incorrectly. (The observation classifier is fed sampled images, not the mean image that we are showing here.)", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5.5 + } + ], + "index": 2 + }, + { + "type": "text", + "bbox": [ + 108, + 271, + 504, + 304 + ], + "lines": [ + { + "bbox": [ + 105, + 270, + 505, + 284 + ], + "spans": [ + { + "bbox": [ + 105, + 270, + 171, + 284 + ], + "score": 1.0, + "content": "orientation, and", + "type": "text" + }, + { + "bbox": [ + 171, + 271, + 195, + 282 + ], + "score": 0.87, + "content": "100 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 270, + 505, + 284 + ], + "score": 1.0, + "content": "for location. Consequently, it is a reliable way to assess the quality of samples", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 282, + 505, + 294 + ], + "spans": [ + { + "bbox": [ + 105, + 282, + 505, + 294 + ], + "score": 1.0, + "content": "from various generative models (see Appendix A.5 for details). We then compute correctness and", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 293, + 357, + 306 + ], + "spans": [ + { + "bbox": [ + 106, + 293, + 357, + 306 + ], + "score": 1.0, + "content": "coverage on the iid dataset, and coverage on the comp dataset.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 106, + 320, + 506, + 441 + ], + "lines": [ + { + "bbox": [ + 105, + 318, + 506, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 506, + 333 + ], + "score": 1.0, + "content": "Familiar concrete concepts. We start by assessing the quality of the models in the simplest setting,", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 104, + 329, + 506, + 344 + ], + "spans": [ + { + "bbox": [ + 104, + 329, + 506, + 344 + ], + "score": 1.0, + "content": "which is where the test concepts are fully specified (i.e., all attributes are known), and the concepts", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 341, + 506, + 355 + ], + "spans": [ + { + "bbox": [ + 105, + 341, + 506, + 355 + ], + "score": 1.0, + "content": "have been seen before in the training set (i.e., we are using the iid split). Figure 4a shows the", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 352, + 506, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 506, + 365 + ], + "score": 1.0, + "content": "correctness scores for the three methods. (Since the test concepts are fully grounded, coverage is not", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 363, + 506, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 363, + 471, + 376 + ], + "score": 1.0, + "content": "well defined, since there are no missing attributes.) We see that TELBO has a correctness of", + "type": "text" + }, + { + "bbox": [ + 471, + 364, + 502, + 374 + ], + "score": 0.88, + "content": "8 2 . 0 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 503, + 363, + 506, + 376 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 375, + 506, + 386 + ], + "spans": [ + { + "bbox": [ + 106, + 375, + 234, + 386 + ], + "score": 1.0, + "content": "which is close to that of JMVAE", + "type": "text" + }, + { + "bbox": [ + 235, + 375, + 271, + 385 + ], + "score": 0.85, + "content": "( 8 5 . 1 5 \\% )", + "type": "inline_equation" + }, + { + "bbox": [ + 271, + 375, + 466, + 386 + ], + "score": 1.0, + "content": "; both methods significantly outperform BiVCCA", + "type": "text" + }, + { + "bbox": [ + 466, + 375, + 502, + 385 + ], + "score": 0.84, + "content": "( 6 7 . 3 8 \\% )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 375, + 506, + 386 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "score": 1.0, + "content": "To gain more insight, Figure 3 shows some samples from each of these methods for a leaf concept", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 396, + 506, + 409 + ], + "spans": [ + { + "bbox": [ + 105, + 396, + 506, + 409 + ], + "score": 1.0, + "content": "chosen at random. We see that the images generated by BiVCCA are very blurry, for reasons we", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 406, + 505, + 420 + ], + "spans": [ + { + "bbox": [ + 105, + 406, + 505, + 420 + ], + "score": 1.0, + "content": "discussed in Section 4. Note that these blurry images are correctly detected by the attribute classifier.3", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 419, + 506, + 431 + ], + "spans": [ + { + "bbox": [ + 106, + 419, + 506, + 431 + ], + "score": 1.0, + "content": "We also see that the JMVAE samples all look good (in this example). Most of the samples from", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 429, + 489, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 429, + 489, + 442 + ], + "score": 1.0, + "content": "TELBO are also good, although there is one error (correctly detected by the attribute classifier).", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 16 + }, + { + "type": "table", + "bbox": [ + 120, + 457, + 266, + 591 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 120, + 457, + 266, + 591 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 120, + 457, + 266, + 591 + ], + "spans": [ + { + "bbox": [ + 120, + 457, + 266, + 591 + ], + "score": 0.967, + "html": "
Method#AttributesCoverage (%)Correctness (%)
iid split
TELBO482.08±0.56
JMVAE85.15 ±0.26
BiVCCA67.38 ±0.69
TELBO391.14 ± 0.5381.63 ± 0.38
JMVAE88.52 ± 0.3782.00 ±0.37
BiVCCA85.28 ±0.6870.68 ± 0.87
TELBO290.32 ± 0.5782.03 ± 1.37
JMVAE87.89 ±0.6981.02 ± 1.05
BiVCCA85.09 ±0.7672.33 ± 2.31
TELBO190.94 ±0.1983.67 ± 1.70
JMVAE88.70 ±0.3581.58 ± 1.78
BiVCCA85.53 ± 0.2768.36 ± 2.21
Compositional split
TELBO475.61 ± 1.43
JMVAE76.86 ± 1.30
BiVCCA68.58 ± 1.02
", + "type": "table", + "image_path": "0faabdc7b40f83eded736f7ec49e2e40b2a62fba35641045b2969b9692bc11f9.jpg" + } + ] + } + ], + "index": 22.5, + "virtual_lines": [ + { + "bbox": [ + 120, + 457, + 266, + 524.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 120, + 524.0, + 266, + 591.0 + ], + "spans": [], + "index": 23 + } + ] + } + ], + "index": 22.5 + }, + { + "type": "image", + "bbox": [ + 285, + 467, + 500, + 589 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 285, + 467, + 500, + 589 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 285, + 467, + 500, + 589 + ], + "spans": [ + { + "bbox": [ + 285, + 467, + 500, + 589 + ], + "score": 0.968, + "type": "image", + "image_path": "67115530c872ea1da2927de9b0adb176a254c84c012a930b88a6d53d578942b5.jpg" + } + ] + } + ], + "index": 28.5, + "virtual_lines": [ + { + "bbox": [ + 285, + 467, + 500, + 479.2 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 285, + 479.2, + 500, + 491.4 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 285, + 491.4, + 500, + 503.59999999999997 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 285, + 503.59999999999997, + 500, + 515.8 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 285, + 515.8, + 500, + 528.0 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 285, + 528.0, + 500, + 540.2 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 285, + 540.2, + 500, + 552.4000000000001 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 285, + 552.4000000000001, + 500, + 564.6000000000001 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 285, + 564.6000000000001, + 500, + 576.8000000000002 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 285, + 576.8000000000002, + 500, + 589.0000000000002 + ], + "spans": [], + "index": 33 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 293, + 595, + 493, + 626 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 293, + 595, + 492, + 606 + ], + "spans": [ + { + "bbox": [ + 293, + 595, + 492, + 606 + ], + "score": 1.0, + "content": "(b) Mean images generated by TELBO and JMVAE", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 293, + 605, + 494, + 617 + ], + "spans": [ + { + "bbox": [ + 293, + 605, + 494, + 617 + ], + "score": 1.0, + "content": "in response to queries at different levels of abstraction,", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 293, + 615, + 464, + 627 + ], + "spans": [ + { + "bbox": [ + 293, + 615, + 464, + 627 + ], + "score": 1.0, + "content": "starting from abstract (top) to refined (bottom).", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 39 + } + ], + "index": 33.75 + }, + { + "type": "text", + "bbox": [ + 120, + 598, + 266, + 639 + ], + "lines": [ + { + "bbox": [ + 119, + 597, + 266, + 609 + ], + "spans": [ + { + "bbox": [ + 119, + 597, + 266, + 609 + ], + "score": 1.0, + "content": "(a) Evaluation of different approaches on", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 120, + 608, + 267, + 618 + ], + "spans": [ + { + "bbox": [ + 120, + 608, + 267, + 618 + ], + "score": 1.0, + "content": "the test set. Higher numbers are better.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 119, + 618, + 266, + 629 + ], + "spans": [ + { + "bbox": [ + 119, + 618, + 266, + 629 + ], + "score": 1.0, + "content": "We report standard deviation across 5", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 120, + 628, + 194, + 640 + ], + "spans": [ + { + "bbox": [ + 120, + 628, + 194, + 640 + ], + "score": 1.0, + "content": "splits of the test set.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 35.5 + }, + { + "type": "text", + "bbox": [ + 106, + 648, + 505, + 708 + ], + "lines": [ + { + "bbox": [ + 106, + 648, + 506, + 660 + ], + "spans": [ + { + "bbox": [ + 106, + 648, + 506, + 660 + ], + "score": 1.0, + "content": "Figure 4: (a) We show quantitaive results on the 3C’s on MNIST-A. (b) Qualitative results on MNIST-A for", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 658, + 506, + 670 + ], + "spans": [ + { + "bbox": [ + 105, + 658, + 506, + 670 + ], + "score": 1.0, + "content": "various queries. For refined/fully specified queries, we can see that both TELBO and JMVAE produce good", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 668, + 506, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 668, + 506, + 679 + ], + "score": 1.0, + "content": "correctness, i.e., the images produced follow constraints placed by the specified attributes. When the attribute", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "‘orientation’ is unspecified, we see that TELBO produces upright and counter clockwise digits, while JMVAE", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 688, + 505, + 699 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 505, + 699 + ], + "score": 1.0, + "content": "produces clockwise and upright digits. Finally, when we leave the digit unspecified (top), we see that TELBO", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 698, + 436, + 709 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 436, + 709 + ], + "score": 1.0, + "content": "appears to generate a more diverse set of digits (9, 3, 8, 6) while JMVAE produces 0 and 3.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 43.5 + } + ], + "page_idx": 7, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 752, + 308, + 760 + ], + "lines": [ + { + "bbox": [ + 301, + 750, + 310, + 762 + ], + "spans": [ + { + "bbox": [ + 301, + 750, + 310, + 762 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 12, + "width": 9 + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 106, + 712, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 118, + 709, + 506, + 724 + ], + "spans": [ + { + "bbox": [ + 118, + 709, + 205, + 724 + ], + "score": 1.0, + "content": "3 We chose the value of", + "type": "text" + }, + { + "bbox": [ + 205, + 712, + 236, + 722 + ], + "score": 0.88, + "content": "\\mu = 0 . 7", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 709, + 506, + 724 + ], + "score": 1.0, + "content": "based on maximizing correctness score on the validation set. Nevertheless,", + "type": "text" + } + ] + }, + { + "bbox": [ + 106, + 721, + 325, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 325, + 732 + ], + "score": 1.0, + "content": "this does not completely eliminate blurriness, as we can see.", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "image", + "bbox": [ + 113, + 102, + 500, + 204 + ], + "blocks": [ + { + "type": "image_caption", + "bbox": [ + 109, + 84, + 252, + 95 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 109, + 84, + 252, + 97 + ], + "spans": [ + { + "bbox": [ + 109, + 84, + 252, + 97 + ], + "score": 1.0, + "content": "Query: 0, small, clockwise, top-right", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "image_body", + "bbox": [ + 113, + 102, + 500, + 204 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 113, + 102, + 500, + 204 + ], + "spans": [ + { + "bbox": [ + 113, + 102, + 500, + 204 + ], + "score": 0.967, + "type": "image", + "image_path": "216614ff4d58de7325957c620c11d08b9ac4d0b78fb017fed0bf9166d2831af1.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 113, + 102, + 500, + 136.0 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 113, + 136.0, + 500, + 170.0 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 113, + 170.0, + 500, + 204.0 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 217, + 505, + 257 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 216, + 506, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 506, + 229 + ], + "score": 1.0, + "content": "Figure 3: Samples from attribute vectors seen at training time, generated by the 3 different models. We plot", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 226, + 506, + 239 + ], + "spans": [ + { + "bbox": [ + 105, + 226, + 228, + 239 + ], + "score": 1.0, + "content": "the posterior mean of each pixel,", + "type": "text" + }, + { + "bbox": [ + 229, + 227, + 260, + 237 + ], + "score": 0.87, + "content": "\\mathbb { E } \\left[ \\mathbf { x } | \\mathbf { z } _ { s } \\right]", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 226, + 288, + 239 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 288, + 227, + 345, + 239 + ], + "score": 0.93, + "content": "\\mathbf { z } _ { s } \\sim \\hat { q } _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 226, + 506, + 239 + ], + "score": 1.0, + "content": ". The caption at the top of each little image", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 236, + 505, + 248 + ], + "spans": [ + { + "bbox": [ + 105, + 236, + 505, + 248 + ], + "score": 1.0, + "content": "is the predicted attribute values. The border of the generated image is red if any of the attributes are predicted", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 246, + 501, + 258 + ], + "spans": [ + { + "bbox": [ + 106, + 246, + 501, + 258 + ], + "score": 1.0, + "content": "incorrectly. (The observation classifier is fed sampled images, not the mean image that we are showing here.)", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5.5 + } + ], + "index": 2 + }, + { + "type": "text", + "bbox": [ + 108, + 271, + 504, + 304 + ], + "lines": [], + "index": 9, + "bbox_fs": [ + 105, + 270, + 505, + 306 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 106, + 320, + 506, + 441 + ], + "lines": [ + { + "bbox": [ + 105, + 318, + 506, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 506, + 333 + ], + "score": 1.0, + "content": "Familiar concrete concepts. We start by assessing the quality of the models in the simplest setting,", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 104, + 329, + 506, + 344 + ], + "spans": [ + { + "bbox": [ + 104, + 329, + 506, + 344 + ], + "score": 1.0, + "content": "which is where the test concepts are fully specified (i.e., all attributes are known), and the concepts", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 341, + 506, + 355 + ], + "spans": [ + { + "bbox": [ + 105, + 341, + 506, + 355 + ], + "score": 1.0, + "content": "have been seen before in the training set (i.e., we are using the iid split). Figure 4a shows the", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 352, + 506, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 506, + 365 + ], + "score": 1.0, + "content": "correctness scores for the three methods. (Since the test concepts are fully grounded, coverage is not", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 363, + 506, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 363, + 471, + 376 + ], + "score": 1.0, + "content": "well defined, since there are no missing attributes.) We see that TELBO has a correctness of", + "type": "text" + }, + { + "bbox": [ + 471, + 364, + 502, + 374 + ], + "score": 0.88, + "content": "8 2 . 0 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 503, + 363, + 506, + 376 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 375, + 506, + 386 + ], + "spans": [ + { + "bbox": [ + 106, + 375, + 234, + 386 + ], + "score": 1.0, + "content": "which is close to that of JMVAE", + "type": "text" + }, + { + "bbox": [ + 235, + 375, + 271, + 385 + ], + "score": 0.85, + "content": "( 8 5 . 1 5 \\% )", + "type": "inline_equation" + }, + { + "bbox": [ + 271, + 375, + 466, + 386 + ], + "score": 1.0, + "content": "; both methods significantly outperform BiVCCA", + "type": "text" + }, + { + "bbox": [ + 466, + 375, + 502, + 385 + ], + "score": 0.84, + "content": "( 6 7 . 3 8 \\% )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 375, + 506, + 386 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "score": 1.0, + "content": "To gain more insight, Figure 3 shows some samples from each of these methods for a leaf concept", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 396, + 506, + 409 + ], + "spans": [ + { + "bbox": [ + 105, + 396, + 506, + 409 + ], + "score": 1.0, + "content": "chosen at random. We see that the images generated by BiVCCA are very blurry, for reasons we", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 406, + 505, + 420 + ], + "spans": [ + { + "bbox": [ + 105, + 406, + 505, + 420 + ], + "score": 1.0, + "content": "discussed in Section 4. Note that these blurry images are correctly detected by the attribute classifier.3", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 419, + 506, + 431 + ], + "spans": [ + { + "bbox": [ + 106, + 419, + 506, + 431 + ], + "score": 1.0, + "content": "We also see that the JMVAE samples all look good (in this example). Most of the samples from", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 429, + 489, + 442 + ], + "spans": [ + { + "bbox": [ + 105, + 429, + 489, + 442 + ], + "score": 1.0, + "content": "TELBO are also good, although there is one error (correctly detected by the attribute classifier).", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 16, + "bbox_fs": [ + 104, + 318, + 506, + 442 + ] + }, + { + "type": "table", + "bbox": [ + 120, + 457, + 266, + 591 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 120, + 457, + 266, + 591 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 120, + 457, + 266, + 591 + ], + "spans": [ + { + "bbox": [ + 120, + 457, + 266, + 591 + ], + "score": 0.967, + "html": "
Method#AttributesCoverage (%)Correctness (%)
iid split
TELBO482.08±0.56
JMVAE85.15 ±0.26
BiVCCA67.38 ±0.69
TELBO391.14 ± 0.5381.63 ± 0.38
JMVAE88.52 ± 0.3782.00 ±0.37
BiVCCA85.28 ±0.6870.68 ± 0.87
TELBO290.32 ± 0.5782.03 ± 1.37
JMVAE87.89 ±0.6981.02 ± 1.05
BiVCCA85.09 ±0.7672.33 ± 2.31
TELBO190.94 ±0.1983.67 ± 1.70
JMVAE88.70 ±0.3581.58 ± 1.78
BiVCCA85.53 ± 0.2768.36 ± 2.21
Compositional split
TELBO475.61 ± 1.43
JMVAE76.86 ± 1.30
BiVCCA68.58 ± 1.02
", + "type": "table", + "image_path": "0faabdc7b40f83eded736f7ec49e2e40b2a62fba35641045b2969b9692bc11f9.jpg" + } + ] + } + ], + "index": 22.5, + "virtual_lines": [ + { + "bbox": [ + 120, + 457, + 266, + 524.0 + ], + "spans": [], + "index": 22 + }, + { + "bbox": [ + 120, + 524.0, + 266, + 591.0 + ], + "spans": [], + "index": 23 + } + ] + } + ], + "index": 22.5 + }, + { + "type": "image", + "bbox": [ + 285, + 467, + 500, + 589 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 285, + 467, + 500, + 589 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 285, + 467, + 500, + 589 + ], + "spans": [ + { + "bbox": [ + 285, + 467, + 500, + 589 + ], + "score": 0.968, + "type": "image", + "image_path": "67115530c872ea1da2927de9b0adb176a254c84c012a930b88a6d53d578942b5.jpg" + } + ] + } + ], + "index": 28.5, + "virtual_lines": [ + { + "bbox": [ + 285, + 467, + 500, + 479.2 + ], + "spans": [], + "index": 24 + }, + { + "bbox": [ + 285, + 479.2, + 500, + 491.4 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 285, + 491.4, + 500, + 503.59999999999997 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 285, + 503.59999999999997, + 500, + 515.8 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 285, + 515.8, + 500, + 528.0 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 285, + 528.0, + 500, + 540.2 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 285, + 540.2, + 500, + 552.4000000000001 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 285, + 552.4000000000001, + 500, + 564.6000000000001 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 285, + 564.6000000000001, + 500, + 576.8000000000002 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 285, + 576.8000000000002, + 500, + 589.0000000000002 + ], + "spans": [], + "index": 33 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 293, + 595, + 493, + 626 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 293, + 595, + 492, + 606 + ], + "spans": [ + { + "bbox": [ + 293, + 595, + 492, + 606 + ], + "score": 1.0, + "content": "(b) Mean images generated by TELBO and JMVAE", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 293, + 605, + 494, + 617 + ], + "spans": [ + { + "bbox": [ + 293, + 605, + 494, + 617 + ], + "score": 1.0, + "content": "in response to queries at different levels of abstraction,", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 293, + 615, + 464, + 627 + ], + "spans": [ + { + "bbox": [ + 293, + 615, + 464, + 627 + ], + "score": 1.0, + "content": "starting from abstract (top) to refined (bottom).", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 39 + } + ], + "index": 33.75 + }, + { + "type": "text", + "bbox": [ + 120, + 598, + 266, + 639 + ], + "lines": [ + { + "bbox": [ + 119, + 597, + 266, + 609 + ], + "spans": [ + { + "bbox": [ + 119, + 597, + 266, + 609 + ], + "score": 1.0, + "content": "(a) Evaluation of different approaches on", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 120, + 608, + 267, + 618 + ], + "spans": [ + { + "bbox": [ + 120, + 608, + 267, + 618 + ], + "score": 1.0, + "content": "the test set. Higher numbers are better.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 119, + 618, + 266, + 629 + ], + "spans": [ + { + "bbox": [ + 119, + 618, + 266, + 629 + ], + "score": 1.0, + "content": "We report standard deviation across 5", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 120, + 628, + 194, + 640 + ], + "spans": [ + { + "bbox": [ + 120, + 628, + 194, + 640 + ], + "score": 1.0, + "content": "splits of the test set.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 35.5, + "bbox_fs": [ + 119, + 597, + 267, + 640 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 648, + 505, + 708 + ], + "lines": [ + { + "bbox": [ + 106, + 648, + 506, + 660 + ], + "spans": [ + { + "bbox": [ + 106, + 648, + 506, + 660 + ], + "score": 1.0, + "content": "Figure 4: (a) We show quantitaive results on the 3C’s on MNIST-A. (b) Qualitative results on MNIST-A for", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 658, + 506, + 670 + ], + "spans": [ + { + "bbox": [ + 105, + 658, + 506, + 670 + ], + "score": 1.0, + "content": "various queries. For refined/fully specified queries, we can see that both TELBO and JMVAE produce good", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 668, + 506, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 668, + 506, + 679 + ], + "score": 1.0, + "content": "correctness, i.e., the images produced follow constraints placed by the specified attributes. When the attribute", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "‘orientation’ is unspecified, we see that TELBO produces upright and counter clockwise digits, while JMVAE", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 688, + 505, + 699 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 505, + 699 + ], + "score": 1.0, + "content": "produces clockwise and upright digits. Finally, when we leave the digit unspecified (top), we see that TELBO", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 698, + 436, + 709 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 436, + 709 + ], + "score": 1.0, + "content": "appears to generate a more diverse set of digits (9, 3, 8, 6) while JMVAE produces 0 and 3.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 43.5, + "bbox_fs": [ + 105, + 648, + 506, + 709 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 505, + 171 + ], + "lines": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "Novel abstract concepts. Next we assess the quality of the models when the test concepts are", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "score": 1.0, + "content": "abstract, i.e., one or more attributes are not specified. (Note that the model was never trained on", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 103, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 103, + 506, + 117 + ], + "score": 1.0, + "content": "such abstract concepts.) Figure 4a shows that the correctness scores for JMVAE seems to drop", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 127 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 199, + 127 + ], + "score": 1.0, + "content": "somewhat (from about", + "type": "text" + }, + { + "bbox": [ + 200, + 115, + 219, + 126 + ], + "score": 0.87, + "content": "85 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 115, + 255, + 127 + ], + "score": 1.0, + "content": "to about", + "type": "text" + }, + { + "bbox": [ + 256, + 115, + 284, + 126 + ], + "score": 0.87, + "content": "8 1 . 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 115, + 506, + 127 + ], + "score": 1.0, + "content": "), although it remains steady for TELBO and BiVCCA.", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 125, + 506, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 125, + 506, + 139 + ], + "score": 1.0, + "content": "We also see that the coverage of TELBO is higher than the other methods, due to the use of the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 107, + 136, + 506, + 151 + ], + "spans": [ + { + "bbox": [ + 107, + 137, + 193, + 151 + ], + "score": 0.92, + "content": "\\mathrm { K L } ( q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) , p _ { \\pmb { \\theta } } ( \\mathbf { z } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 136, + 506, + 151 + ], + "score": 1.0, + "content": "regularizer, as we discussed in Section 4. Figure 4b illustrates how the methods", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 150, + 505, + 161 + ], + "spans": [ + { + "bbox": [ + 106, + 150, + 505, + 161 + ], + "score": 1.0, + "content": "respond to concepts of different levels of abstraction. The samples from the TELBO seem to be more", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 160, + 343, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 160, + 343, + 172 + ], + "score": 1.0, + "content": "diverse, which is consistent with the numbers in Figure 4a.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 3.5 + }, + { + "type": "text", + "bbox": [ + 107, + 186, + 505, + 253 + ], + "lines": [ + { + "bbox": [ + 106, + 187, + 505, + 198 + ], + "spans": [ + { + "bbox": [ + 106, + 187, + 505, + 198 + ], + "score": 1.0, + "content": "Compositionally novel concrete concepts. Finally we assess the quality of the models when the", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 198, + 506, + 209 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 506, + 209 + ], + "score": 1.0, + "content": "test concepts are fully specified, but have not been seen before (i.e., we are using the comp split).", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 209, + 505, + 220 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 505, + 220 + ], + "score": 1.0, + "content": "Figure 4a shows some quantitative results. We see that the correctness for TELBO and JMVAE", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 218, + 506, + 234 + ], + "spans": [ + { + "bbox": [ + 105, + 218, + 208, + 234 + ], + "score": 1.0, + "content": "has dropped from about", + "type": "text" + }, + { + "bbox": [ + 208, + 220, + 228, + 230 + ], + "score": 0.87, + "content": "82 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 218, + 266, + 234 + ], + "score": 1.0, + "content": "to about", + "type": "text" + }, + { + "bbox": [ + 266, + 220, + 286, + 230 + ], + "score": 0.89, + "content": "7 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 218, + 506, + 234 + ], + "score": 1.0, + "content": ", since this task is much harder, and requires “strong", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 230, + 507, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 507, + 243 + ], + "score": 1.0, + "content": "generalization”. However, as before, we see that both TELBO and JMVAE outperform BiVCCA,", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 241, + 482, + 254 + ], + "spans": [ + { + "bbox": [ + 105, + 241, + 238, + 254 + ], + "score": 1.0, + "content": "which has a correctness of about", + "type": "text" + }, + { + "bbox": [ + 239, + 241, + 258, + 252 + ], + "score": 0.87, + "content": "69 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 241, + 482, + 254 + ], + "score": 1.0, + "content": ". See Appendix A.7 qualitative results and more details.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 10.5 + }, + { + "type": "title", + "bbox": [ + 107, + 268, + 168, + 280 + ], + "lines": [ + { + "bbox": [ + 105, + 267, + 169, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 267, + 169, + 282 + ], + "score": 1.0, + "content": "5.2 CELEBA", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 106, + 290, + 505, + 532 + ], + "lines": [ + { + "bbox": [ + 105, + 290, + 506, + 303 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 506, + 303 + ], + "score": 1.0, + "content": "In this section, we report results on the CelebA dataset (Liu et al., 2015). In particular, we use", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 300, + 506, + 314 + ], + "spans": [ + { + "bbox": [ + 105, + 300, + 506, + 314 + ], + "score": 1.0, + "content": "the version that was used in Perarnau et al. (2016), which selects 18 visually distinctive attributes,", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 312, + 506, + 325 + ], + "spans": [ + { + "bbox": [ + 106, + 312, + 226, + 325 + ], + "score": 1.0, + "content": "and generate images of size", + "type": "text" + }, + { + "bbox": [ + 226, + 313, + 256, + 323 + ], + "score": 0.88, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 312, + 506, + 325 + ], + "score": 1.0, + "content": "; see Appendix A.8 for more details on the CelebA dataset", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 322, + 505, + 336 + ], + "spans": [ + { + "bbox": [ + 105, + 322, + 505, + 336 + ], + "score": 1.0, + "content": "and Appendix A.4 for details of the model architectures. Figure 5 shows some sample qualitative", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "score": 1.0, + "content": "results. On the top left, we show some images which were generated by the three methods given", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 345, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 506, + 358 + ], + "score": 1.0, + "content": "the concept shown in the left column. TELBO and JMVAE generate realistic and diverse images.", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 357, + 506, + 369 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 506, + 369 + ], + "score": 1.0, + "content": "That is, the generated images are generally of males, with mouth slightly open and smiling attributes", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 367, + 506, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 506, + 380 + ], + "score": 1.0, + "content": "present in the images. On the other hand, BiVCCA just generates the mean image. On the bottom", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 378, + 506, + 391 + ], + "spans": [ + { + "bbox": [ + 105, + 378, + 506, + 391 + ], + "score": 1.0, + "content": "left, we show what happens when we drop some attributes, thus specifying more abstract concepts.", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 388, + 506, + 403 + ], + "spans": [ + { + "bbox": [ + 105, + 388, + 506, + 403 + ], + "score": 1.0, + "content": "We see that when we drop the gender, we get a mixture of both male and female images for both", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 400, + 505, + 412 + ], + "spans": [ + { + "bbox": [ + 106, + 400, + 505, + 412 + ], + "score": 1.0, + "content": "TELBO and JMVAE. Going further, when we drop the “smiling” attribute, we see that the samples", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 412, + 505, + 423 + ], + "spans": [ + { + "bbox": [ + 106, + 412, + 505, + 423 + ], + "score": 1.0, + "content": "now comprise of people who are smiling as well as not smiling, and we see a mixture of genders in", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 421, + 506, + 435 + ], + "spans": [ + { + "bbox": [ + 105, + 421, + 506, + 435 + ], + "score": 1.0, + "content": "the samples. Further, while we see a greater diversity in the samples, we also notice a slight drop in", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 433, + 506, + 446 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 506, + 446 + ], + "score": 1.0, + "content": "image quality (presumably because none of the approaches has seen supervision with just ‘abstract’", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 444, + 505, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 444, + 505, + 456 + ], + "score": 1.0, + "content": "concepts). See Appendix A.9 for more qualitative examples on CelebA. On the top right, we show", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 455, + 505, + 468 + ], + "spans": [ + { + "bbox": [ + 105, + 455, + 505, + 468 + ], + "score": 1.0, + "content": "some examples of visual imagination, where we ask the models to generate images from the concept", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "score": 1.0, + "content": "“bald female”, which does not occur in the training set.4 (We omit the results from BiVCCA, which", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "score": 1.0, + "content": "are uniformly poor.) We see that both TELBO and JMVAE can sometimes do a fairly reasonable", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 488, + 505, + 500 + ], + "spans": [ + { + "bbox": [ + 105, + 488, + 505, + 500 + ], + "score": 1.0, + "content": "job (although these are admittedly cherry picked results). Finally, the bottom right illustrates an", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 500, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 106, + 500, + 505, + 511 + ], + "score": 1.0, + "content": "interesting bias in the dataset: if we ask the model to generate images where we do not specify the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 509, + 506, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 506, + 523 + ], + "score": 1.0, + "content": "value of the eyeglasses attribute, nearly all of the samples fail to included glasses, since the prior", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 521, + 293, + 533 + ], + "spans": [ + { + "bbox": [ + 105, + 521, + 271, + 533 + ], + "score": 1.0, + "content": "probability of this attribute is rare (about", + "type": "text" + }, + { + "bbox": [ + 271, + 521, + 285, + 531 + ], + "score": 0.84, + "content": "6 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 521, + 293, + 533 + ], + "score": 1.0, + "content": ").", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 25.5 + }, + { + "type": "title", + "bbox": [ + 107, + 551, + 375, + 563 + ], + "lines": [ + { + "bbox": [ + 106, + 550, + 376, + 565 + ], + "spans": [ + { + "bbox": [ + 106, + 550, + 376, + 565 + ], + "score": 1.0, + "content": "6 CONCEPT NAMING WITH IMAGINATION MODELS", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 37 + }, + { + "type": "text", + "bbox": [ + 106, + 577, + 505, + 698 + ], + "lines": [ + { + "bbox": [ + 106, + 578, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 106, + 578, + 505, + 589 + ], + "score": 1.0, + "content": "In this section, we demonstrate initial results which show that our imagination models can be used", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 104, + 587, + 506, + 601 + ], + "spans": [ + { + "bbox": [ + 104, + 587, + 506, + 601 + ], + "score": 1.0, + "content": "for concept naming, where the task is to assign a label to a set of images illustrating the concept", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 600, + 504, + 611 + ], + "spans": [ + { + "bbox": [ + 106, + 600, + 504, + 611 + ], + "score": 1.0, + "content": "depicted by the images. A similar problem has been studied in previous work such as Tenenbaum", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 610, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 506, + 622 + ], + "score": 1.0, + "content": "(1999) and Jia et al. (2013). Tenenbaum (1999) studies a set naming problem with integers (instead", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 621, + 505, + 633 + ], + "spans": [ + { + "bbox": [ + 106, + 621, + 505, + 633 + ], + "score": 1.0, + "content": "of images), and show that construct a likelihood function given a hypothesis set that can capture", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 632, + 505, + 644 + ], + "spans": [ + { + "bbox": [ + 106, + 632, + 505, + 644 + ], + "score": 1.0, + "content": "notions of the minimal/smallest hypothesis that explains the observed samples in the set. Jia et al.", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 642, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 106, + 642, + 505, + 656 + ], + "score": 1.0, + "content": "(2013) extend this approach to concept-naming on images, incorporating perceptual uncertainty (in", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 654, + 505, + 666 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 505, + 666 + ], + "score": 1.0, + "content": "recognizing the contents of an image) using a confusion matrix weighted likelihood term. While", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 664, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 664, + 506, + 678 + ], + "score": 1.0, + "content": "this approach first extracts labels for each image and then performs concept naming, here we test", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "score": 1.0, + "content": "how well our generative model itself is able to generalize to concept naming without ever performing", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 687, + 253, + 699 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 253, + 699 + ], + "score": 1.0, + "content": "explicit classification on the images.", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 43 + } + ], + "page_idx": 8, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 106, + 711, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 117, + 708, + 506, + 724 + ], + "spans": [ + { + "bbox": [ + 117, + 708, + 360, + 724 + ], + "score": 1.0, + "content": "4 There are 9 examples in the training set with the attributes (male", + "type": "text" + }, + { + "bbox": [ + 361, + 712, + 371, + 721 + ], + "score": 0.54, + "content": "{ } = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 708, + 390, + 724 + ], + "score": 1.0, + "content": ", bald", + "type": "text" + }, + { + "bbox": [ + 390, + 712, + 401, + 721 + ], + "score": 0.38, + "content": "{ } = 1", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 708, + 506, + 724 + ], + "score": 1.0, + "content": "), but these turn out to all be", + "type": "text" + } + ] + }, + { + "bbox": [ + 106, + 720, + 276, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 276, + 732 + ], + "score": 1.0, + "content": "labeling errors, as we shown in Appendix A.8.", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 308, + 759 + ], + "lines": [ + { + "bbox": [ + 302, + 751, + 309, + 762 + ], + "spans": [ + { + "bbox": [ + 302, + 751, + 309, + 762 + ], + "score": 1.0, + "content": "9", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 505, + 171 + ], + "lines": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "Novel abstract concepts. Next we assess the quality of the models when the test concepts are", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 505, + 106 + ], + "score": 1.0, + "content": "abstract, i.e., one or more attributes are not specified. (Note that the model was never trained on", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 103, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 103, + 506, + 117 + ], + "score": 1.0, + "content": "such abstract concepts.) Figure 4a shows that the correctness scores for JMVAE seems to drop", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 127 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 199, + 127 + ], + "score": 1.0, + "content": "somewhat (from about", + "type": "text" + }, + { + "bbox": [ + 200, + 115, + 219, + 126 + ], + "score": 0.87, + "content": "85 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 115, + 255, + 127 + ], + "score": 1.0, + "content": "to about", + "type": "text" + }, + { + "bbox": [ + 256, + 115, + 284, + 126 + ], + "score": 0.87, + "content": "8 1 . 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 115, + 506, + 127 + ], + "score": 1.0, + "content": "), although it remains steady for TELBO and BiVCCA.", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 125, + 506, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 125, + 506, + 139 + ], + "score": 1.0, + "content": "We also see that the coverage of TELBO is higher than the other methods, due to the use of the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 107, + 136, + 506, + 151 + ], + "spans": [ + { + "bbox": [ + 107, + 137, + 193, + 151 + ], + "score": 0.92, + "content": "\\mathrm { K L } ( q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) , p _ { \\pmb { \\theta } } ( \\mathbf { z } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 136, + 506, + 151 + ], + "score": 1.0, + "content": "regularizer, as we discussed in Section 4. Figure 4b illustrates how the methods", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 150, + 505, + 161 + ], + "spans": [ + { + "bbox": [ + 106, + 150, + 505, + 161 + ], + "score": 1.0, + "content": "respond to concepts of different levels of abstraction. The samples from the TELBO seem to be more", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 160, + 343, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 160, + 343, + 172 + ], + "score": 1.0, + "content": "diverse, which is consistent with the numbers in Figure 4a.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 3.5, + "bbox_fs": [ + 105, + 82, + 506, + 172 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 186, + 505, + 253 + ], + "lines": [ + { + "bbox": [ + 106, + 187, + 505, + 198 + ], + "spans": [ + { + "bbox": [ + 106, + 187, + 505, + 198 + ], + "score": 1.0, + "content": "Compositionally novel concrete concepts. Finally we assess the quality of the models when the", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 198, + 506, + 209 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 506, + 209 + ], + "score": 1.0, + "content": "test concepts are fully specified, but have not been seen before (i.e., we are using the comp split).", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 209, + 505, + 220 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 505, + 220 + ], + "score": 1.0, + "content": "Figure 4a shows some quantitative results. We see that the correctness for TELBO and JMVAE", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 218, + 506, + 234 + ], + "spans": [ + { + "bbox": [ + 105, + 218, + 208, + 234 + ], + "score": 1.0, + "content": "has dropped from about", + "type": "text" + }, + { + "bbox": [ + 208, + 220, + 228, + 230 + ], + "score": 0.87, + "content": "82 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 218, + 266, + 234 + ], + "score": 1.0, + "content": "to about", + "type": "text" + }, + { + "bbox": [ + 266, + 220, + 286, + 230 + ], + "score": 0.89, + "content": "7 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 218, + 506, + 234 + ], + "score": 1.0, + "content": ", since this task is much harder, and requires “strong", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 230, + 507, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 507, + 243 + ], + "score": 1.0, + "content": "generalization”. However, as before, we see that both TELBO and JMVAE outperform BiVCCA,", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 241, + 482, + 254 + ], + "spans": [ + { + "bbox": [ + 105, + 241, + 238, + 254 + ], + "score": 1.0, + "content": "which has a correctness of about", + "type": "text" + }, + { + "bbox": [ + 239, + 241, + 258, + 252 + ], + "score": 0.87, + "content": "69 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 241, + 482, + 254 + ], + "score": 1.0, + "content": ". See Appendix A.7 qualitative results and more details.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 10.5, + "bbox_fs": [ + 105, + 187, + 507, + 254 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 268, + 168, + 280 + ], + "lines": [ + { + "bbox": [ + 105, + 267, + 169, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 267, + 169, + 282 + ], + "score": 1.0, + "content": "5.2 CELEBA", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 106, + 290, + 505, + 532 + ], + "lines": [ + { + "bbox": [ + 105, + 290, + 506, + 303 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 506, + 303 + ], + "score": 1.0, + "content": "In this section, we report results on the CelebA dataset (Liu et al., 2015). In particular, we use", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 300, + 506, + 314 + ], + "spans": [ + { + "bbox": [ + 105, + 300, + 506, + 314 + ], + "score": 1.0, + "content": "the version that was used in Perarnau et al. (2016), which selects 18 visually distinctive attributes,", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 312, + 506, + 325 + ], + "spans": [ + { + "bbox": [ + 106, + 312, + 226, + 325 + ], + "score": 1.0, + "content": "and generate images of size", + "type": "text" + }, + { + "bbox": [ + 226, + 313, + 256, + 323 + ], + "score": 0.88, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 256, + 312, + 506, + 325 + ], + "score": 1.0, + "content": "; see Appendix A.8 for more details on the CelebA dataset", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 322, + 505, + 336 + ], + "spans": [ + { + "bbox": [ + 105, + 322, + 505, + 336 + ], + "score": 1.0, + "content": "and Appendix A.4 for details of the model architectures. Figure 5 shows some sample qualitative", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 505, + 347 + ], + "score": 1.0, + "content": "results. On the top left, we show some images which were generated by the three methods given", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 345, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 506, + 358 + ], + "score": 1.0, + "content": "the concept shown in the left column. TELBO and JMVAE generate realistic and diverse images.", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 357, + 506, + 369 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 506, + 369 + ], + "score": 1.0, + "content": "That is, the generated images are generally of males, with mouth slightly open and smiling attributes", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 367, + 506, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 506, + 380 + ], + "score": 1.0, + "content": "present in the images. On the other hand, BiVCCA just generates the mean image. On the bottom", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 378, + 506, + 391 + ], + "spans": [ + { + "bbox": [ + 105, + 378, + 506, + 391 + ], + "score": 1.0, + "content": "left, we show what happens when we drop some attributes, thus specifying more abstract concepts.", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 388, + 506, + 403 + ], + "spans": [ + { + "bbox": [ + 105, + 388, + 506, + 403 + ], + "score": 1.0, + "content": "We see that when we drop the gender, we get a mixture of both male and female images for both", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 400, + 505, + 412 + ], + "spans": [ + { + "bbox": [ + 106, + 400, + 505, + 412 + ], + "score": 1.0, + "content": "TELBO and JMVAE. Going further, when we drop the “smiling” attribute, we see that the samples", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 412, + 505, + 423 + ], + "spans": [ + { + "bbox": [ + 106, + 412, + 505, + 423 + ], + "score": 1.0, + "content": "now comprise of people who are smiling as well as not smiling, and we see a mixture of genders in", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 421, + 506, + 435 + ], + "spans": [ + { + "bbox": [ + 105, + 421, + 506, + 435 + ], + "score": 1.0, + "content": "the samples. Further, while we see a greater diversity in the samples, we also notice a slight drop in", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 433, + 506, + 446 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 506, + 446 + ], + "score": 1.0, + "content": "image quality (presumably because none of the approaches has seen supervision with just ‘abstract’", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 444, + 505, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 444, + 505, + 456 + ], + "score": 1.0, + "content": "concepts). See Appendix A.9 for more qualitative examples on CelebA. On the top right, we show", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 455, + 505, + 468 + ], + "spans": [ + { + "bbox": [ + 105, + 455, + 505, + 468 + ], + "score": 1.0, + "content": "some examples of visual imagination, where we ask the models to generate images from the concept", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "score": 1.0, + "content": "“bald female”, which does not occur in the training set.4 (We omit the results from BiVCCA, which", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "score": 1.0, + "content": "are uniformly poor.) We see that both TELBO and JMVAE can sometimes do a fairly reasonable", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 488, + 505, + 500 + ], + "spans": [ + { + "bbox": [ + 105, + 488, + 505, + 500 + ], + "score": 1.0, + "content": "job (although these are admittedly cherry picked results). Finally, the bottom right illustrates an", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 500, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 106, + 500, + 505, + 511 + ], + "score": 1.0, + "content": "interesting bias in the dataset: if we ask the model to generate images where we do not specify the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 509, + 506, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 506, + 523 + ], + "score": 1.0, + "content": "value of the eyeglasses attribute, nearly all of the samples fail to included glasses, since the prior", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 521, + 293, + 533 + ], + "spans": [ + { + "bbox": [ + 105, + 521, + 271, + 533 + ], + "score": 1.0, + "content": "probability of this attribute is rare (about", + "type": "text" + }, + { + "bbox": [ + 271, + 521, + 285, + 531 + ], + "score": 0.84, + "content": "6 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 521, + 293, + 533 + ], + "score": 1.0, + "content": ").", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 25.5, + "bbox_fs": [ + 105, + 290, + 506, + 533 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 551, + 375, + 563 + ], + "lines": [ + { + "bbox": [ + 106, + 550, + 376, + 565 + ], + "spans": [ + { + "bbox": [ + 106, + 550, + 376, + 565 + ], + "score": 1.0, + "content": "6 CONCEPT NAMING WITH IMAGINATION MODELS", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 37 + }, + { + "type": "text", + "bbox": [ + 106, + 577, + 505, + 698 + ], + "lines": [ + { + "bbox": [ + 106, + 578, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 106, + 578, + 505, + 589 + ], + "score": 1.0, + "content": "In this section, we demonstrate initial results which show that our imagination models can be used", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 104, + 587, + 506, + 601 + ], + "spans": [ + { + "bbox": [ + 104, + 587, + 506, + 601 + ], + "score": 1.0, + "content": "for concept naming, where the task is to assign a label to a set of images illustrating the concept", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 600, + 504, + 611 + ], + "spans": [ + { + "bbox": [ + 106, + 600, + 504, + 611 + ], + "score": 1.0, + "content": "depicted by the images. A similar problem has been studied in previous work such as Tenenbaum", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 610, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 506, + 622 + ], + "score": 1.0, + "content": "(1999) and Jia et al. (2013). Tenenbaum (1999) studies a set naming problem with integers (instead", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 621, + 505, + 633 + ], + "spans": [ + { + "bbox": [ + 106, + 621, + 505, + 633 + ], + "score": 1.0, + "content": "of images), and show that construct a likelihood function given a hypothesis set that can capture", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 632, + 505, + 644 + ], + "spans": [ + { + "bbox": [ + 106, + 632, + 505, + 644 + ], + "score": 1.0, + "content": "notions of the minimal/smallest hypothesis that explains the observed samples in the set. Jia et al.", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 642, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 106, + 642, + 505, + 656 + ], + "score": 1.0, + "content": "(2013) extend this approach to concept-naming on images, incorporating perceptual uncertainty (in", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 654, + 505, + 666 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 505, + 666 + ], + "score": 1.0, + "content": "recognizing the contents of an image) using a confusion matrix weighted likelihood term. While", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 664, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 664, + 506, + 678 + ], + "score": 1.0, + "content": "this approach first extracts labels for each image and then performs concept naming, here we test", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "score": 1.0, + "content": "how well our generative model itself is able to generalize to concept naming without ever performing", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 687, + 253, + 699 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 253, + 699 + ], + "score": 1.0, + "content": "explicit classification on the images.", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 43, + "bbox_fs": [ + 104, + 578, + 506, + 699 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 110, + 80, + 505, + 200 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 80, + 505, + 200 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 80, + 505, + 200 + ], + "spans": [ + { + "bbox": [ + 110, + 80, + 505, + 200 + ], + "score": 0.965, + "type": "image", + "image_path": "b6b6e00f19c0762479d47d8ed6c0293c054705b7c21da5444678f934722760b6.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 110, + 80, + 505, + 120.0 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 110, + 120.0, + 505, + 160.0 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 110, + 160.0, + 505, + 200.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 211, + 505, + 262 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 210, + 506, + 224 + ], + "spans": [ + { + "bbox": [ + 105, + 210, + 506, + 224 + ], + "score": 1.0, + "content": "Figure 5: Sample CelebA results. Left: we show the attributes specified to be present or absent when generating", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 222, + 505, + 233 + ], + "spans": [ + { + "bbox": [ + 106, + 222, + 505, + 233 + ], + "score": 1.0, + "content": "images. Middle: we show 10 samples each generated from TELBO, JMVAE and BiVCCA. We see that TELBO", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 232, + 506, + 243 + ], + "spans": [ + { + "bbox": [ + 106, + 232, + 506, + 243 + ], + "score": 1.0, + "content": "and JMVAE genreate better samples than BiVCCA which collapses to the mean. Middle, bottom: We show", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 241, + 506, + 253 + ], + "spans": [ + { + "bbox": [ + 106, + 241, + 506, + 253 + ], + "score": 1.0, + "content": "five samples from TELBO and JMVAE in response to queries with unspecified attributes, and see that both", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 252, + 462, + 263 + ], + "spans": [ + { + "bbox": [ + 105, + 252, + 462, + 263 + ], + "score": 1.0, + "content": "approaches generate a mix in the samples, generalizing meaningfully across unspecified attributes.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5 + } + ], + "index": 3.0 + }, + { + "type": "text", + "bbox": [ + 106, + 285, + 506, + 384 + ], + "lines": [ + { + "bbox": [ + 105, + 285, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 105, + 285, + 483, + 297 + ], + "score": 1.0, + "content": "In more detail, the problem setup in concept naming is as follows: we are given as input a set", + "type": "text" + }, + { + "bbox": [ + 483, + 286, + 493, + 295 + ], + "score": 0.81, + "content": "\\mathcal { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 285, + 506, + 297 + ], + "score": 1.0, + "content": "of", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 295, + 506, + 309 + ], + "spans": [ + { + "bbox": [ + 105, + 295, + 506, + 309 + ], + "score": 1.0, + "content": "images, each of which corresponds to a concept in the compositional abstraction hierarchy Figure 1.", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 305, + 506, + 321 + ], + "spans": [ + { + "bbox": [ + 104, + 305, + 215, + 321 + ], + "score": 1.0, + "content": "The task is to assign a label", + "type": "text" + }, + { + "bbox": [ + 215, + 307, + 243, + 318 + ], + "score": 0.9, + "content": "\\mathbf { y } \\in \\mathcal { V }", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 305, + 506, + 321 + ], + "score": 1.0, + "content": "to the set of images. One of the key challenges in concept learning", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 317, + 505, + 330 + ], + "spans": [ + { + "bbox": [ + 105, + 317, + 505, + 330 + ], + "score": 1.0, + "content": "is to understand “how far” to generalize in the concept hierarchy given a limited number of positive", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 328, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 328, + 506, + 342 + ], + "score": 1.0, + "content": "examples (Tenenbaum, 1999). That is, given a small set of images with 7 in the top-left corner and", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 339, + 506, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 506, + 352 + ], + "score": 1.0, + "content": "bottom-right corner, one must infer that the concept is “7” as opposed to “7, top-left”. 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Left: we show the attributes specified to be present or absent when generating", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 222, + 505, + 233 + ], + "spans": [ + { + "bbox": [ + 106, + 222, + 505, + 233 + ], + "score": 1.0, + "content": "images. Middle: we show 10 samples each generated from TELBO, JMVAE and BiVCCA. We see that TELBO", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 232, + 506, + 243 + ], + "spans": [ + { + "bbox": [ + 106, + 232, + 506, + 243 + ], + "score": 1.0, + "content": "and JMVAE genreate better samples than BiVCCA which collapses to the mean. Middle, bottom: We show", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 241, + 506, + 253 + ], + "spans": [ + { + "bbox": [ + 106, + 241, + 506, + 253 + ], + "score": 1.0, + "content": "five samples from TELBO and JMVAE in response to queries with unspecified attributes, and see that both", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 252, + 462, + 263 + ], + "spans": [ + { + "bbox": [ + 105, + 252, + 462, + 263 + ], + "score": 1.0, + "content": "approaches generate a mix in the samples, generalizing meaningfully across unspecified attributes.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5 + } + ], + "index": 3.0 + }, + { + "type": "text", + "bbox": [ + 106, + 285, + 506, + 384 + ], + "lines": [ + { + "bbox": [ + 105, + 285, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 105, + 285, + 483, + 297 + ], + "score": 1.0, + "content": "In more detail, the problem setup in concept naming is as follows: we are given as input a set", + "type": "text" + }, + { + "bbox": [ + 483, + 286, + 493, + 295 + ], + "score": 0.81, + "content": "\\mathcal { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 285, + 506, + 297 + ], + "score": 1.0, + "content": "of", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 295, + 506, + 309 + ], + "spans": [ + { + "bbox": [ + 105, + 295, + 506, + 309 + ], + "score": 1.0, + "content": "images, each of which corresponds to a concept in the compositional abstraction hierarchy Figure 1.", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 104, + 305, + 506, + 321 + ], + "spans": [ + { + "bbox": [ + 104, + 305, + 215, + 321 + ], + "score": 1.0, + "content": "The task is to assign a label", + "type": "text" + }, + { + "bbox": [ + 215, + 307, + 243, + 318 + ], + "score": 0.9, + "content": "\\mathbf { y } \\in \\mathcal { V }", + "type": "inline_equation" + }, + { + "bbox": [ + 243, + 305, + 506, + 321 + ], + "score": 1.0, + "content": "to the set of images. One of the key challenges in concept learning", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 317, + 505, + 330 + ], + "spans": [ + { + "bbox": [ + 105, + 317, + 505, + 330 + ], + "score": 1.0, + "content": "is to understand “how far” to generalize in the concept hierarchy given a limited number of positive", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 328, + 506, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 328, + 506, + 342 + ], + "score": 1.0, + "content": "examples (Tenenbaum, 1999). That is, given a small set of images with 7 in the top-left corner and", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 339, + 506, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 339, + 506, + 352 + ], + "score": 1.0, + "content": "bottom-right corner, one must infer that the concept is “7” as opposed to “7, top-left”. In other words,", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 350, + 506, + 364 + ], + "spans": [ + { + "bbox": [ + 105, + 350, + 506, + 364 + ], + "score": 1.0, + "content": "we wish to find the least common ancestor (in the concept hierarchy) corresponding to all the images", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 362, + 505, + 374 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 505, + 374 + ], + "score": 1.0, + "content": "in the set, given any number of images in the set, so that we can be consistent with the set. We", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 373, + 300, + 385 + ], + "spans": [ + { + "bbox": [ + 106, + 373, + 300, + 385 + ], + "score": 1.0, + "content": "consider two heuristic solutions to this problem:", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 12, + "bbox_fs": [ + 104, + 285, + 506, + 385 + ] + }, + { + "type": "text", + "bbox": [ + 131, + 395, + 504, + 419 + ], + "lines": [ + { + "bbox": [ + 129, + 393, + 506, + 410 + ], + "spans": [ + { + "bbox": [ + 129, + 393, + 359, + 410 + ], + "score": 1.0, + "content": "1. 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Concept-Latent: In this approach, instead of working in the observed space, we work in the", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 141, + 495, + 506, + 510 + ], + "spans": [ + { + "bbox": [ + 141, + 495, + 265, + 510 + ], + "score": 1.0, + "content": "latent space. That is, we pick a", + "type": "text" + }, + { + "bbox": [ + 266, + 496, + 378, + 508 + ], + "score": 0.83, + "content": "\\mathrm { r g m i n } _ { \\mathbf { y } } \\mathrm { K L } ( q ( \\mathbf { z } | \\mathcal { X } ) | \\bar { q ( \\mathbf { z } | \\mathbf { y } ) } )", + "type": "inline_equation" + }, + { + "bbox": [ + 379, + 495, + 408, + 510 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 409, + 496, + 439, + 508 + ], + "score": 0.93, + "content": "q ( \\mathbf { z } | \\mathcal { X } )", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 495, + 506, + 510 + ], + "score": 1.0, + "content": "is approximated", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 141, + 506, + 506, + 522 + ], + "spans": [ + { + "bbox": [ + 141, + 506, + 166, + 522 + ], + "score": 1.0, + "content": "using", + "type": "text" + }, + { + "bbox": [ + 167, + 506, + 223, + 520 + ], + "score": 0.92, + "content": "\\bar { \\sum _ { \\mathbf { x } \\in \\mathcal { X } } q ( \\mathbf { z } | \\mathbf { x } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 506, + 506, + 522 + ], + "score": 1.0, + "content": ", which is a mixture of gaussians. The KL divergence can be computed", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 519, + 444, + 532 + ], + "spans": [ + { + "bbox": [ + 141, + 519, + 444, + 532 + ], + "score": 1.0, + "content": "analytically by considering the first two moments of the gaussian mixture5.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23.5, + "bbox_fs": [ + 128, + 484, + 506, + 532 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 546, + 230, + 558 + ], + "lines": [ + { + "bbox": [ + 106, + 546, + 231, + 558 + ], + "spans": [ + { + "bbox": [ + 106, + 546, + 231, + 558 + ], + "score": 1.0, + "content": "6.1 EXPERIMENTAL SETUP", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26 + }, + { + "type": "text", + "bbox": [ + 106, + 567, + 505, + 689 + ], + "lines": [ + { + "bbox": [ + 106, + 567, + 505, + 580 + ], + "spans": [ + { + "bbox": [ + 106, + 567, + 505, + 580 + ], + "score": 1.0, + "content": "We use the MNIST-A dataset for the concept naming studies. 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Now, for each fully specified attribute pattern in the iid split of MNIST-A,", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 622, + 506, + 635 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 506, + 635 + ], + "score": 1.0, + "content": "we sample four missingness patterns and repeat across all fully specified attributes to form a bank of", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 633, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 506, + 646 + ], + "score": 1.0, + "content": "960 candidate names that a model must choose. 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Specifically, given all the images in the eval set for a concept", + "type": "text" + }, + { + "bbox": [ + 378, + 657, + 385, + 667 + ], + "score": 0.47, + "content": "\\mathbf { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 385, + 655, + 424, + 668 + ], + "score": 1.0, + "content": ", we form", + "type": "text" + }, + { + "bbox": [ + 424, + 656, + 434, + 665 + ], + "score": 0.8, + "content": "\\mathcal { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 655, + 506, + 668 + ], + "score": 1.0, + "content": "using a randomly", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 666, + 506, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 506, + 680 + ], + "score": 1.0, + "content": "sampled subset of 5 images. We report the accuracy metric, measuring how often the selected concept", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 677, + 474, + 690 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 141, + 690 + ], + "score": 1.0, + "content": "for a set", + "type": "text" + }, + { + "bbox": [ + 141, + 678, + 151, + 687 + ], + "score": 0.8, + "content": "\\mathcal { X }", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 677, + 474, + 690 + ], + "score": 1.0, + "content": "matches the ground truth concept, across three different splits of 100 datapoints.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 32, + "bbox_fs": [ + 105, + 567, + 507, + 690 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "table", + "bbox": [ + 226, + 80, + 384, + 140 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 226, + 80, + 384, + 140 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 226, + 80, + 384, + 140 + ], + "spans": [ + { + "bbox": [ + 226, + 80, + 384, + 140 + ], + "score": 0.971, + "html": "
ApproachConcept-Latent (%)Concept-NB (%)
TELBO35.66 ± 2.0517.66 ± 1.70
JMVAE54.66 ± 4.9213.33 ± 2.05
BiVCCA28.00 ± 4.5418.00 ± 1.40
Random0.28±0.000.28±0.00
Most Frequent6.33 ± 1.886.33 ± 1.88
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Higher is better.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + } + ], + "index": 2.75 + }, + { + "type": "image", + "bbox": [ + 110, + 180, + 500, + 294 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 180, + 500, + 294 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 180, + 500, + 294 + ], + "spans": [ + { + "bbox": [ + 110, + 180, + 500, + 294 + ], + "score": 0.97, + "type": "image", + "image_path": "d8dbbd7899942a27afafc0400945fd04332ca9dcd37f0361b8f6a7b42039a005.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 110, + 180, + 500, + 218.0 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 110, + 218.0, + 500, + 256.0 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 110, + 256.0, + 500, + 294.0 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 306, + 505, + 386 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 306, + 505, + 317 + ], + "spans": [ + { + "bbox": [ + 106, + 306, + 505, + 317 + ], + "score": 1.0, + "content": "Figure 6: A qualitative illustration of some of the examples from concept naming models. Top-left: an example", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 316, + 506, + 327 + ], + "spans": [ + { + "bbox": [ + 106, + 316, + 506, + 327 + ], + "score": 1.0, + "content": "of a sample that is correctly named by a Concept-NB model. However, the Concept-NB model is not that", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 326, + 505, + 337 + ], + "spans": [ + { + "bbox": [ + 106, + 326, + 505, + 337 + ], + "score": 1.0, + "content": "strong and often gets simple concepts such as digits incorrect, making mistakes between 6 and 0, for example", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 336, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 106, + 336, + 506, + 347 + ], + "score": 1.0, + "content": "(bottom-left). This is likely because the only way in which the Concept-NB approach reasons about the set is not", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 345, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 506, + 358 + ], + "score": 1.0, + "content": "via a \"meaningful\" low dimensional latent variable but via a sampling distribution on a high dimensional space", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 355, + 506, + 367 + ], + "spans": [ + { + "bbox": [ + 105, + 355, + 506, + 367 + ], + "score": 1.0, + "content": "of images. The Concept-Latent model is able to do better on the same set of images, and classify the set as the", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 104, + 364, + 506, + 379 + ], + "spans": [ + { + "bbox": [ + 104, + 364, + 506, + 379 + ], + "score": 1.0, + "content": "concept “6”. Finally, we show a failure case of the model where it incorrectly classifies the digits as being large", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 375, + 435, + 388 + ], + "spans": [ + { + "bbox": [ + 105, + 375, + 435, + 388 + ], + "score": 1.0, + "content": "(there is a small digit in the set), and ignores the fact that all of the digits are in the top-left.", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 11.5 + } + ], + "index": 8.75 + }, + { + "type": "title", + "bbox": [ + 107, + 412, + 170, + 423 + ], + "lines": [ + { + "bbox": [ + 105, + 410, + 171, + 425 + ], + "spans": [ + { + "bbox": [ + 105, + 410, + 171, + 425 + ], + "score": 1.0, + "content": "6.2 RESULTS", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 16 + }, + { + "type": "text", + "bbox": [ + 106, + 434, + 505, + 556 + ], + "lines": [ + { + "bbox": [ + 106, + 434, + 505, + 447 + ], + "spans": [ + { + "bbox": [ + 106, + 434, + 505, + 447 + ], + "score": 1.0, + "content": "We evaluate the best versions of TELBO, JMVAE, and BiVCCA on the iid split of MNIST-A", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 446, + 506, + 458 + ], + "spans": [ + { + "bbox": [ + 106, + 446, + 506, + 458 + ], + "score": 1.0, + "content": "for concept naming (Table 1). In general, we find that Concept-NB approaches perform signifi-", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 456, + 506, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 506, + 470 + ], + "score": 1.0, + "content": "cantly worse than Concept-Latent approaches. For example, the best Concept-NB approach (using", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 466, + 506, + 481 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 337, + 481 + ], + "score": 1.0, + "content": "TELBO/BiVCCA objective) gets to an accuracy of around", + "type": "text" + }, + { + "bbox": [ + 338, + 468, + 357, + 478 + ], + "score": 0.88, + "content": "1 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 466, + 506, + 481 + ], + "score": 1.0, + "content": ", while Concept-Latent using JMVAE", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 478, + 136, + 491 + ], + "score": 1.0, + "content": "gets to", + "type": "text" + }, + { + "bbox": [ + 136, + 478, + 198, + 489 + ], + "score": 0.92, + "content": "5 4 . 6 6 \\pm 4 . 9 2 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 478, + 506, + 491 + ], + "score": 1.0, + "content": ". In general, these numbers are better than a random chance baseline which", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 489, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 159, + 501 + ], + "score": 1.0, + "content": "would get to", + "type": "text" + }, + { + "bbox": [ + 159, + 489, + 187, + 500 + ], + "score": 0.86, + "content": "0 . 2 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 489, + 505, + 501 + ], + "score": 1.0, + "content": "(picking one of 348 effective options, after collating the 960 candidate names", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 499, + 506, + 514 + ], + "spans": [ + { + "bbox": [ + 104, + 499, + 506, + 514 + ], + "score": 1.0, + "content": "based on missingness patterns), while picking the most frequent (ground truth) fully-specified y", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 511, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 511, + 251, + 524 + ], + "score": 1.0, + "content": "depicted across an image set gets to", + "type": "text" + }, + { + "bbox": [ + 251, + 511, + 308, + 522 + ], + "score": 0.92, + "content": "6 . 3 \\bar { 3 } \\pm 1 . \\bar { 8 } 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 511, + 505, + 524 + ], + "score": 1.0, + "content": ". Figure 6 shows some qualitative examples from", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 522, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 106, + 522, + 505, + 534 + ], + "score": 1.0, + "content": "Concept-NB as well as Concept-Latent models for concept / set classification. We observe that the", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 533, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 505, + 546 + ], + "score": 1.0, + "content": "Concept-Latent models are much more powerful than using Concept-NB in terms of naming the", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 545, + 353, + 557 + ], + "spans": [ + { + "bbox": [ + 106, + 545, + 353, + 557 + ], + "score": 1.0, + "content": "concept based on few positive examples from the support set.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 22 + }, + { + "type": "title", + "bbox": [ + 108, + 577, + 304, + 589 + ], + "lines": [ + { + "bbox": [ + 105, + 575, + 307, + 592 + ], + "spans": [ + { + "bbox": [ + 105, + 575, + 307, + 592 + ], + "score": 1.0, + "content": "7 CONCLUSIONS AND FUTURE WORK", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 605, + 505, + 649 + ], + "lines": [ + { + "bbox": [ + 105, + 605, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 505, + 618 + ], + "score": 1.0, + "content": "We have shown how to create generative models which can “imagine” compositionally novel concrete", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 616, + 506, + 628 + ], + "spans": [ + { + "bbox": [ + 106, + 616, + 506, + 628 + ], + "score": 1.0, + "content": "and abstract visual concepts. In the future we would like to explore richer forms of description,", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 626, + 506, + 640 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 506, + 640 + ], + "score": 1.0, + "content": "beyond attribute vectors, such as natural language text, as well as compositional descriptions of", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 638, + 383, + 650 + ], + "spans": [ + { + "bbox": [ + 106, + 638, + 383, + 650 + ], + "score": 1.0, + "content": "scenes, which will require dealing with a variable number of objects.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30.5 + }, + { + "type": "title", + "bbox": [ + 108, + 667, + 200, + 677 + ], + "lines": [ + { + "bbox": [ + 107, + 668, + 200, + 678 + ], + "spans": [ + { + "bbox": [ + 107, + 668, + 200, + 678 + ], + "score": 1.0, + "content": "ACKNOWLEDGMENTS", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 505, + 699 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 505, + 699 + ], + "score": 1.0, + "content": "We would like to thank Hernan Moraldo for his help in writing the JVAE library, Alex Alemi for", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "valuable insights on TELBO and JMVAE, and Sergio Guadarrama and Harsh Satija for numerous", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "discussions around the project. Finally we would like to thank Devi Parikh for advice on the CelebA", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 721, + 474, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 474, + 732 + ], + "score": 1.0, + "content": "experiments, and Stefan Lee and Yash Goyal for feedback on an initial version of this draft.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 35.5 + } + ], + "page_idx": 10, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 309, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 13 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "table", + "bbox": [ + 226, + 80, + 384, + 140 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 226, + 80, + 384, + 140 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 226, + 80, + 384, + 140 + ], + "spans": [ + { + "bbox": [ + 226, + 80, + 384, + 140 + ], + "score": 0.971, + "html": "
ApproachConcept-Latent (%)Concept-NB (%)
TELBO35.66 ± 2.0517.66 ± 1.70
JMVAE54.66 ± 4.9213.33 ± 2.05
BiVCCA28.00 ± 4.5418.00 ± 1.40
Random0.28±0.000.28±0.00
Most Frequent6.33 ± 1.886.33 ± 1.88
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Higher is better.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + } + ], + "index": 2.75 + }, + { + "type": "image", + "bbox": [ + 110, + 180, + 500, + 294 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 180, + 500, + 294 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 180, + 500, + 294 + ], + "spans": [ + { + "bbox": [ + 110, + 180, + 500, + 294 + ], + "score": 0.97, + "type": "image", + "image_path": "d8dbbd7899942a27afafc0400945fd04332ca9dcd37f0361b8f6a7b42039a005.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 110, + 180, + 500, + 218.0 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 110, + 218.0, + 500, + 256.0 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 110, + 256.0, + 500, + 294.0 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 306, + 505, + 386 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 306, + 505, + 317 + ], + "spans": [ + { + "bbox": [ + 106, + 306, + 505, + 317 + ], + "score": 1.0, + "content": "Figure 6: A qualitative illustration of some of the examples from concept naming models. Top-left: an example", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 316, + 506, + 327 + ], + "spans": [ + { + "bbox": [ + 106, + 316, + 506, + 327 + ], + "score": 1.0, + "content": "of a sample that is correctly named by a Concept-NB model. However, the Concept-NB model is not that", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 326, + 505, + 337 + ], + "spans": [ + { + "bbox": [ + 106, + 326, + 505, + 337 + ], + "score": 1.0, + "content": "strong and often gets simple concepts such as digits incorrect, making mistakes between 6 and 0, for example", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 336, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 106, + 336, + 506, + 347 + ], + "score": 1.0, + "content": "(bottom-left). 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In general, we find that Concept-NB approaches perform signifi-", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 456, + 506, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 506, + 470 + ], + "score": 1.0, + "content": "cantly worse than Concept-Latent approaches. 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In general, these numbers are better than a random chance baseline which", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 489, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 159, + 501 + ], + "score": 1.0, + "content": "would get to", + "type": "text" + }, + { + "bbox": [ + 159, + 489, + 187, + 500 + ], + "score": 0.86, + "content": "0 . 2 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 489, + 505, + 501 + ], + "score": 1.0, + "content": "(picking one of 348 effective options, after collating the 960 candidate names", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 499, + 506, + 514 + ], + "spans": [ + { + "bbox": [ + 104, + 499, + 506, + 514 + ], + "score": 1.0, + "content": "based on missingness patterns), while picking the most frequent (ground truth) fully-specified y", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 511, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 511, + 251, + 524 + ], + "score": 1.0, + "content": "depicted across an image set gets to", + "type": "text" + }, + { + "bbox": [ + 251, + 511, + 308, + 522 + ], + "score": 0.92, + "content": "6 . 3 \\bar { 3 } \\pm 1 . \\bar { 8 } 8 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 511, + 505, + 524 + ], + "score": 1.0, + "content": ". Figure 6 shows some qualitative examples from", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 522, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 106, + 522, + 505, + 534 + ], + "score": 1.0, + "content": "Concept-NB as well as Concept-Latent models for concept / set classification. We observe that the", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 533, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 505, + 546 + ], + "score": 1.0, + "content": "Concept-Latent models are much more powerful than using Concept-NB in terms of naming the", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 545, + 353, + 557 + ], + "spans": [ + { + "bbox": [ + 106, + 545, + 353, + 557 + ], + "score": 1.0, + "content": "concept based on few positive examples from the support set.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 22, + "bbox_fs": [ + 104, + 434, + 506, + 557 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 577, + 304, + 589 + ], + "lines": [ + { + "bbox": [ + 105, + 575, + 307, + 592 + ], + "spans": [ + { + "bbox": [ + 105, + 575, + 307, + 592 + ], + "score": 1.0, + "content": "7 CONCLUSIONS AND FUTURE WORK", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 605, + 505, + 649 + ], + "lines": [ + { + "bbox": [ + 105, + 605, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 505, + 618 + ], + "score": 1.0, + "content": "We have shown how to create generative models which can “imagine” compositionally novel concrete", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 616, + 506, + 628 + ], + "spans": [ + { + "bbox": [ + 106, + 616, + 506, + 628 + ], + "score": 1.0, + "content": "and abstract visual concepts. In the future we would like to explore richer forms of description,", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 626, + 506, + 640 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 506, + 640 + ], + "score": 1.0, + "content": "beyond attribute vectors, such as natural language text, as well as compositional descriptions of", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 638, + 383, + 650 + ], + "spans": [ + { + "bbox": [ + 106, + 638, + 383, + 650 + ], + "score": 1.0, + "content": "scenes, which will require dealing with a variable number of objects.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30.5, + "bbox_fs": [ + 105, + 605, + 506, + 650 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 667, + 200, + 677 + ], + "lines": [ + { + "bbox": [ + 107, + 668, + 200, + 678 + ], + "spans": [ + { + "bbox": [ + 107, + 668, + 200, + 678 + ], + "score": 1.0, + "content": "ACKNOWLEDGMENTS", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 505, + 699 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 505, + 699 + ], + "score": 1.0, + "content": "We would like to thank Hernan Moraldo for his help in writing the JVAE library, Alex Alemi for", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "valuable insights on TELBO and JMVAE, and Sergio Guadarrama and Harsh Satija for numerous", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "discussions around the project. 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Then we can write", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5 + }, + { + "type": "interline_equation", + "bbox": [ + 130, + 207, + 479, + 238 + ], + "lines": [ + { + "bbox": [ + 130, + 207, + 479, + 238 + ], + "spans": [ + { + "bbox": [ + 130, + 207, + 479, + 238 + ], + "score": 0.94, + "content": "\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) ) \\right] = \\frac { 1 } { | \\mathcal { y } | } \\sum _ { i \\in \\mathcal { Y } } \\frac { 1 } { N _ { i } } \\sum _ { n \\in \\mathbf { X } _ { i } } \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) )", + "type": "interline_equation", + "image_path": "85052c8f00f15282deac81a90031dac109c48d61909c3fcc84cbc0554661c4f3.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 130, + 207, + 479, + 217.33333333333334 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 130, + 217.33333333333334, + 479, + 227.66666666666669 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 130, + 227.66666666666669, + 479, + 238.00000000000003 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 242, + 505, + 276 + ], + "lines": [ + { + "bbox": [ + 105, + 241, + 505, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 241, + 484, + 255 + ], + "score": 1.0, + "content": "As explained in (Hoffman & Johnson, 2016), we can rewrite this by treating the index", + "type": "text" + }, + { + "bbox": [ + 484, + 243, + 505, + 253 + ], + "score": 0.82, + "content": "n \\in", + "type": "inline_equation" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 252, + 505, + 266 + ], + "spans": [ + { + "bbox": [ + 107, + 253, + 158, + 265 + ], + "score": 0.9, + "content": "\\{ 1 , \\cdots , N _ { i } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 252, + 295, + 266 + ], + "score": 1.0, + "content": "as a random variable, with prior", + "type": "text" + }, + { + "bbox": [ + 295, + 253, + 362, + 265 + ], + "score": 0.93, + "content": "q ( n | \\mathbf { y } _ { i } ) = 1 / N _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 252, + 505, + 266 + ], + "score": 1.0, + "content": ". 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Since each", + "type": "text" + }, + { + "bbox": [ + 288, + 410, + 340, + 422 + ], + "score": 0.93, + "content": "q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 408, + 506, + 423 + ], + "score": 1.0, + "content": "is close to a delta function (since there is", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 420, + 505, + 434 + ], + "spans": [ + { + "bbox": [ + 105, + 420, + 468, + 434 + ], + "score": 1.0, + "content": "little posterior uncertainty when conditioning on an image), we are essentially requiring that", + "type": "text" + }, + { + "bbox": [ + 468, + 420, + 505, + 433 + ], + "score": 0.93, + "content": "q _ { \\phi } ( \\mathbf { z } | \\mathbf { y } _ { i } )", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 431, + 295, + 445 + ], + "spans": [ + { + "bbox": [ + 105, + 431, + 295, + 445 + ], + "score": 1.0, + "content": "cover the embeddings of each of these images.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23 + }, + { + "type": "title", + "bbox": [ + 108, + 456, + 293, + 468 + ], + "lines": [ + { + "bbox": [ + 106, + 456, + 294, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 294, + 469 + ], + "score": 1.0, + "content": "A.2 DETAILS ON THE MNIST-A DATASET", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26 + }, + { + "type": "text", + "bbox": [ + 107, + 476, + 506, + 510 + ], + "lines": [ + { + "bbox": [ + 105, + 475, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 475, + 505, + 490 + ], + "score": 1.0, + "content": "We created the MNIST-A dataset as follows. Given an image in the original MNIST dataset, we", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "score": 1.0, + "content": "first sample a discrete scale label (big or small), an orientation label (clockwise, upright, and anti-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 499, + 420, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 420, + 511 + ], + "score": 1.0, + "content": "clockwise), and a location label (top-left, top-right, bottom-left, bottom-right).", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 106, + 516, + 504, + 538 + ], + "lines": [ + { + "bbox": [ + 105, + 515, + 505, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 505, + 528 + ], + "score": 1.0, + "content": "Next, we converted this vector of discrete attributes into a vector of continuous transformation", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 527, + 306, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 306, + 539 + ], + "score": 1.0, + "content": "parameters, using the procedure described below:", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30.5 + }, + { + "type": "text", + "bbox": [ + 132, + 549, + 506, + 699 + ], + "lines": [ + { + "bbox": [ + 134, + 549, + 505, + 560 + ], + "spans": [ + { + "bbox": [ + 134, + 549, + 505, + 560 + ], + "score": 1.0, + "content": "• Scale: For big, we sample scale values from a Gaussian centered at 0.9 with a standard", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 142, + 560, + 505, + 572 + ], + "spans": [ + { + "bbox": [ + 142, + 560, + 505, + 572 + ], + "score": 1.0, + "content": "deviation of 0.1, while for small we sample from a Gaussian centered at 0.6 with a standard", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 141, + 570, + 505, + 583 + ], + "spans": [ + { + "bbox": [ + 141, + 570, + 505, + 583 + ], + "score": 1.0, + "content": "deviation of 0.1. In all cases, we reject and draw a sample again if we get values outside the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 141, + 581, + 506, + 594 + ], + "spans": [ + { + "bbox": [ + 141, + 581, + 506, + 594 + ], + "score": 1.0, + "content": "range [0.4, 1.0], to avoid artifacts from upsampling or problems with illegible (small) digits.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 139, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 139, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "Orientation: For the clockwise label, we sample the amount of rotation to apply for a digit", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 141, + 607, + 506, + 620 + ], + "spans": [ + { + "bbox": [ + 141, + 607, + 261, + 620 + ], + "score": 1.0, + "content": "from a Gaussian centered at", + "type": "text" + }, + { + "bbox": [ + 261, + 608, + 279, + 618 + ], + "score": 0.84, + "content": "+ 4 5", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 607, + 506, + 620 + ], + "score": 1.0, + "content": "degrees, with a standard deviation of 10 degrees. For", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 141, + 618, + 507, + 631 + ], + "spans": [ + { + "bbox": [ + 141, + 618, + 507, + 631 + ], + "score": 1.0, + "content": "anti-clockwise, we use a Gaussian at -45 degrees, with a standard deviation of 10 degrees.", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 141, + 628, + 363, + 643 + ], + "spans": [ + { + "bbox": [ + 141, + 628, + 363, + 643 + ], + "score": 1.0, + "content": "For upright, we set the rotation to be 0 degrees always.", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 138, + 644, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 138, + 644, + 505, + 656 + ], + "score": 1.0, + "content": "Location: For location, we place Gaussians at the centers of the four quadrants in the", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 142, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 142, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "image, and then apply an offset of image_size/16 to shift the centers a bit towards the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 142, + 667, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 142, + 667, + 505, + 678 + ], + "score": 1.0, + "content": "corresponding corners. We then use a standard deviation of image_size/16 and sample", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 142, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 142, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "locations for centers of the digits. We reject and draw the sample again if we find that the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 141, + 688, + 478, + 700 + ], + "spans": [ + { + "bbox": [ + 141, + 688, + 478, + 700 + ], + "score": 1.0, + "content": "location for the center would place the extremities of the digit outside of the canvas.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 38 + }, + { + "type": "text", + "bbox": [ + 107, + 709, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 471, + 722 + ], + "score": 1.0, + "content": "Finally, we generate the image as follows. 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Let", + "type": "text" + }, + { + "bbox": [ + 342, + 170, + 351, + 180 + ], + "score": 0.83, + "content": "\\mathcal { V }", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 168, + 506, + 183 + ], + "score": 1.0, + "content": "be the set of unique labels (attribute", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 181, + 504, + 195 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 212, + 195 + ], + "score": 1.0, + "content": "vectors) in the training set,", + "type": "text" + }, + { + "bbox": [ + 213, + 183, + 224, + 193 + ], + "score": 0.88, + "content": "\\mathcal { X } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 181, + 419, + 195 + ], + "score": 1.0, + "content": "be the indices of the images associated with label", + "type": "text" + }, + { + "bbox": [ + 419, + 183, + 429, + 194 + ], + "score": 0.86, + "content": "\\mathbf { y } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 430, + 181, + 462, + 195 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 462, + 182, + 504, + 194 + ], + "score": 0.92, + "content": "N _ { i } = | \\mathcal { X } _ { i } |", + "type": "inline_equation" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 193, + 272, + 204 + ], + "spans": [ + { + "bbox": [ + 106, + 193, + 272, + 204 + ], + "score": 1.0, + "content": "be the size of that set. Then we can write", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5, + "bbox_fs": [ + 105, + 168, + 506, + 204 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 130, + 207, + 479, + 238 + ], + "lines": [ + { + "bbox": [ + 130, + 207, + 479, + 238 + ], + "spans": [ + { + "bbox": [ + 130, + 207, + 479, + 238 + ], + "score": 0.94, + "content": "\\mathbb { E } _ { \\hat { p } ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } , \\mathbf { y } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } ) ) \\right] = \\frac { 1 } { | \\mathcal { y } | } \\sum _ { i \\in \\mathcal { Y } } \\frac { 1 } { N _ { i } } \\sum _ { n \\in \\mathbf { X } _ { i } } \\mathrm { K L } ( q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } ) , q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) )", + "type": "interline_equation", + "image_path": "85052c8f00f15282deac81a90031dac109c48d61909c3fcc84cbc0554661c4f3.jpg" + } + ] + } + ], + "index": 8, + "virtual_lines": [ + { + "bbox": [ + 130, + 207, + 479, + 217.33333333333334 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 130, + 217.33333333333334, + 479, + 227.66666666666669 + ], + "spans": [], + "index": 8 + }, + { + "bbox": [ + 130, + 227.66666666666669, + 479, + 238.00000000000003 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 242, + 505, + 276 + ], + "lines": [ + { + "bbox": [ + 105, + 241, + 505, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 241, + 484, + 255 + ], + "score": 1.0, + "content": "As explained in (Hoffman & Johnson, 2016), we can rewrite this by treating the index", + "type": "text" + }, + { + "bbox": [ + 484, + 243, + 505, + 253 + ], + "score": 0.82, + "content": "n \\in", + "type": "inline_equation" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 252, + 505, + 266 + ], + "spans": [ + { + "bbox": [ + 107, + 253, + 158, + 265 + ], + "score": 0.9, + "content": "\\{ 1 , \\cdots , N _ { i } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 252, + 295, + 266 + ], + "score": 1.0, + "content": "as a random variable, with prior", + "type": "text" + }, + { + "bbox": [ + 295, + 253, + 362, + 265 + ], + "score": 0.93, + "content": "q ( n | \\mathbf { y } _ { i } ) = 1 / N _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 252, + 505, + 266 + ], + "score": 1.0, + "content": ". Also, let us define the likelihood", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 107, + 264, + 496, + 277 + ], + "spans": [ + { + "bbox": [ + 107, + 264, + 212, + 277 + ], + "score": 0.91, + "content": "q ( \\mathbf { z } | n , \\mathbf { y } _ { i } ) \\stackrel { - } { = } q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 264, + 496, + 277 + ], + "score": 1.0, + "content": ". Using this notation, we can show that the above average KL becomes", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 11, + "bbox_fs": [ + 105, + 241, + 505, + 277 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 150, + 281, + 460, + 311 + ], + "lines": [ + { + "bbox": [ + 150, + 281, + 460, + 311 + ], + "spans": [ + { + "bbox": [ + 150, + 281, + 460, + 311 + ], + "score": 0.91, + "content": "\\frac { 1 } { | \\mathcal { D } | } \\sum _ { i \\in \\mathcal { Y } } \\Big \\{ \\mathrm { K L } ( q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) | q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) ) + \\log N _ { i } - \\mathbb { E } _ { q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) } \\left[ \\mathbb { H } ( q ( n | \\mathbf { z } , \\mathbf { y } _ { i } ) ) \\right] \\Big \\}", + "type": "interline_equation", + "image_path": "6cc99c7bba48d5c5ad1d0c79ba5b3d7e7b26754662d2c8f9b2296add5e677901.jpg" + } + 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Since each", + "type": "text" + }, + { + "bbox": [ + 288, + 410, + 340, + 422 + ], + "score": 0.93, + "content": "q _ { \\phi } ( \\mathbf { z } | \\mathbf { x } _ { n } , \\mathbf { y } _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 408, + 506, + 423 + ], + "score": 1.0, + "content": "is close to a delta function (since there is", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 420, + 505, + 434 + ], + "spans": [ + { + "bbox": [ + 105, + 420, + 468, + 434 + ], + "score": 1.0, + "content": "little posterior uncertainty when conditioning on an image), we are essentially requiring that", + "type": "text" + }, + { + "bbox": [ + 468, + 420, + 505, + 433 + ], + "score": 0.93, + "content": "q _ { \\phi } ( \\mathbf { z } | \\mathbf { y } _ { i } )", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 431, + 295, + 445 + ], + "spans": [ + { + "bbox": [ + 105, + 431, + 295, + 445 + ], + "score": 1.0, + "content": "cover the embeddings of each of these images.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23, + "bbox_fs": [ + 105, + 383, + 506, + 445 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 456, + 293, + 468 + ], + "lines": [ + { + "bbox": [ + 106, + 456, + 294, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 294, + 469 + ], + "score": 1.0, + "content": "A.2 DETAILS ON THE MNIST-A DATASET", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26 + }, + { + "type": "text", + "bbox": [ + 107, + 476, + 506, + 510 + ], + "lines": [ + { + "bbox": [ + 105, + 475, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 475, + 505, + 490 + ], + "score": 1.0, + "content": "We created the MNIST-A dataset as follows. Given an image in the original MNIST dataset, we", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "score": 1.0, + "content": "first sample a discrete scale label (big or small), an orientation label (clockwise, upright, and anti-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 499, + 420, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 420, + 511 + ], + "score": 1.0, + "content": "clockwise), and a location label (top-left, top-right, bottom-left, bottom-right).", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 28, + "bbox_fs": [ + 105, + 475, + 506, + 511 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 516, + 504, + 538 + ], + "lines": [ + { + "bbox": [ + 105, + 515, + 505, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 505, + 528 + ], + "score": 1.0, + "content": "Next, we converted this vector of discrete attributes into a vector of continuous transformation", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 527, + 306, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 306, + 539 + ], + "score": 1.0, + "content": "parameters, using the procedure described below:", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30.5, + "bbox_fs": [ + 105, + 515, + 505, + 539 + ] + }, + { + "type": "text", + "bbox": [ + 132, + 549, + 506, + 699 + ], + "lines": [ + { + "bbox": [ + 134, + 549, + 505, + 560 + ], + "spans": [ + { + "bbox": [ + 134, + 549, + 505, + 560 + ], + "score": 1.0, + "content": "• Scale: For big, we sample scale values from a Gaussian centered at 0.9 with a standard", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 142, + 560, + 505, + 572 + ], + "spans": [ + { + "bbox": [ + 142, + 560, + 505, + 572 + ], + "score": 1.0, + "content": "deviation of 0.1, while for small we sample from a Gaussian centered at 0.6 with a standard", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 141, + 570, + 505, + 583 + ], + "spans": [ + { + "bbox": [ + 141, + 570, + 505, + 583 + ], + "score": 1.0, + "content": "deviation of 0.1. In all cases, we reject and draw a sample again if we get values outside the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 141, + 581, + 506, + 594 + ], + "spans": [ + { + "bbox": [ + 141, + 581, + 506, + 594 + ], + "score": 1.0, + "content": "range [0.4, 1.0], to avoid artifacts from upsampling or problems with illegible (small) digits.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 139, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 139, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "Orientation: For the clockwise label, we sample the amount of rotation to apply for a digit", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 141, + 607, + 506, + 620 + ], + "spans": [ + { + "bbox": [ + 141, + 607, + 261, + 620 + ], + "score": 1.0, + "content": "from a Gaussian centered at", + "type": "text" + }, + { + "bbox": [ + 261, + 608, + 279, + 618 + ], + "score": 0.84, + "content": "+ 4 5", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 607, + 506, + 620 + ], + "score": 1.0, + "content": "degrees, with a standard deviation of 10 degrees. For", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 141, + 618, + 507, + 631 + ], + "spans": [ + { + "bbox": [ + 141, + 618, + 507, + 631 + ], + "score": 1.0, + "content": "anti-clockwise, we use a Gaussian at -45 degrees, with a standard deviation of 10 degrees.", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 141, + 628, + 363, + 643 + ], + "spans": [ + { + "bbox": [ + 141, + 628, + 363, + 643 + ], + "score": 1.0, + "content": "For upright, we set the rotation to be 0 degrees always.", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 138, + 644, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 138, + 644, + 505, + 656 + ], + "score": 1.0, + "content": "Location: For location, we place Gaussians at the centers of the four quadrants in the", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 142, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 142, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "image, and then apply an offset of image_size/16 to shift the centers a bit towards the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 142, + 667, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 142, + 667, + 505, + 678 + ], + "score": 1.0, + "content": "corresponding corners. We then use a standard deviation of image_size/16 and sample", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 142, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 142, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "locations for centers of the digits. We reject and draw the sample again if we find that the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 141, + 688, + 478, + 700 + ], + "spans": [ + { + "bbox": [ + 141, + 688, + 478, + 700 + ], + "score": 1.0, + "content": "location for the center would place the extremities of the digit outside of the canvas.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 38, + "bbox_fs": [ + 134, + 549, + 507, + 700 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 709, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 471, + 722 + ], + "score": 1.0, + "content": "Finally, we generate the image as follows. We first take an empty black canvas of size", + "type": "text" + }, + { + "bbox": [ + 472, + 710, + 502, + 720 + ], + "score": 0.81, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 709, + 506, + 722 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 183, + 733 + ], + "score": 1.0, + "content": "rotate the original", + "type": "text" + }, + { + "bbox": [ + 183, + 721, + 214, + 731 + ], + "score": 0.78, + "content": "2 8 \\times 2 8", + "type": "inline_equation" + }, + { + "bbox": [ + 214, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "MNIST image, and then scale and translate the image and paste it on", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 82, + 505, + 94 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 505, + 94 + ], + "score": 1.0, + "content": "the canvas. (We use bicubic interpolation for scaling and resizing the images.) Finally, we use the", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "score": 1.0, + "content": "method of (Salakhutdinov & Murray, 2008) to binarize the images. See Figure 7 for example images", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 196, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 196, + 117 + ], + "score": 1.0, + "content": "generated in this way.", + "type": "text", + "cross_page": true + } + ], + "index": 2 + } + ], + "index": 45.5, + "bbox_fs": [ + 105, + 709, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 108, + 82, + 504, + 115 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 505, + 94 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 505, + 94 + ], + "score": 1.0, + "content": "the canvas. (We use bicubic interpolation for scaling and resizing the images.) Finally, we use the", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "score": 1.0, + "content": "method of (Salakhutdinov & Murray, 2008) to binarize the images. See Figure 7 for example images", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 196, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 196, + 117 + ], + "score": 1.0, + "content": "generated in this way.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 106, + 121, + 506, + 209 + ], + "lines": [ + { + "bbox": [ + 105, + 121, + 506, + 135 + ], + "spans": [ + { + "bbox": [ + 105, + 121, + 506, + 135 + ], + "score": 1.0, + "content": "We repeat the above process of sampling labels, and applying corresponding transformations, to", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 133, + 506, + 144 + ], + "spans": [ + { + "bbox": [ + 105, + 133, + 506, + 144 + ], + "score": 1.0, + "content": "generate images 10 times for each image in the original MNIST dataset. Each trial samples labels", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 144, + 506, + 156 + ], + "spans": [ + { + "bbox": [ + 105, + 144, + 506, + 156 + ], + "score": 1.0, + "content": "from a uniform categorical distribution over the sample space for the corresponding attribute. Thus,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 154, + 506, + 166 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 506, + 166 + ], + "score": 1.0, + "content": "we get a new MNIST-A dataset with 700,000 images from the original MNIST dataset of 70,000", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 165, + 335, + 178 + ], + "score": 1.0, + "content": "images. We split the images into a train, val and test set of", + "type": "text" + }, + { + "bbox": [ + 335, + 165, + 354, + 176 + ], + "score": 0.85, + "content": "85 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 165, + 357, + 178 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 358, + 165, + 372, + 176 + ], + "score": 0.81, + "content": "5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 165, + 393, + 178 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 393, + 165, + 412, + 176 + ], + "score": 0.87, + "content": "10 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "of the data respectively", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 104, + 176, + 506, + 189 + ], + "spans": [ + { + "bbox": [ + 104, + 176, + 375, + 189 + ], + "score": 1.0, + "content": "to create the IID split. 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Each small digit", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 613, + 505, + 625 + ], + "spans": [ + { + "bbox": [ + 105, + 613, + 226, + 625 + ], + "score": 1.0, + "content": "is a single sample generated from", + "type": "text" + }, + { + "bbox": [ + 227, + 613, + 252, + 624 + ], + "score": 0.92, + "content": "p ( x | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 613, + 357, + 625 + ], + "score": 1.0, + "content": "from the corresponding point", + "type": "text" + }, + { + "bbox": [ + 358, + 614, + 364, + 622 + ], + "score": 0.78, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 613, + 431, + 625 + ], + "score": 1.0, + "content": "in latent space. (a)", + "type": "text" + }, + { + "bbox": [ + 432, + 613, + 438, + 623 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 613, + 505, + 625 + ], + "score": 1.0, + "content": "-VAE fit to images", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 623, + 505, + 634 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 257, + 634 + ], + "score": 1.0, + "content": "without annotations. The color of a point", + "type": "text" + }, + { + "bbox": [ + 257, + 625, + 263, + 632 + ], + "score": 0.8, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 263, + 623, + 505, + 634 + ], + "score": 1.0, + "content": "is inferred from looking at the attributes of the training image that", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 223, + 645 + ], + "score": 1.0, + "content": "maps to this point of space using", + "type": "text" + }, + { + "bbox": [ + 223, + 633, + 248, + 644 + ], + "score": 0.91, + "content": "q ( z | x )", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 633, + 505, + 645 + ], + "score": 1.0, + "content": ". Note that the red region (corresponding to the concept of large and even", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 642, + 506, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 642, + 458, + 654 + ], + "score": 1.0, + "content": "digits) is almost non existent. (b) Joint-VAE fit to images with annotations. 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(2017a) is an approach that aims to learn disentangled latent spaces. It does", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 339, + 700 + ], + "score": 1.0, + "content": "this by modifying the ELBO objective, so that it scales the", + "type": "text" + }, + { + "bbox": [ + 340, + 688, + 410, + 699 + ], + "score": 0.9, + "content": "\\mathrm { K L } ( q ( \\mathbf { z } | \\mathbf { x } ) , p ( \\mathbf { z } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 687, + 477, + 700 + ], + "score": 1.0, + "content": "term by a factor", + "type": "text" + }, + { + "bbox": [ + 478, + 688, + 503, + 699 + ], + "score": 0.9, + "content": "\\beta > 1", + "type": "inline_equation" + }, + { + "bbox": [ + 503, + 687, + 506, + 700 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 698, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 317, + 711 + ], + "score": 1.0, + "content": "This gives rise to disentangled spaces since the prior", + "type": "text" + }, + { + "bbox": [ + 318, + 700, + 389, + 711 + ], + "score": 0.94, + "content": "p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\mathbf { 0 } , \\mathbf { I } )", + "type": "inline_equation" + }, + { + "bbox": [ + 389, + 698, + 506, + 711 + ], + "score": 1.0, + "content": "is factorized (see (Achille &", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 707, + 507, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 707, + 507, + 723 + ], + "score": 1.0, + "content": "Soatto, 2017) for details). However, to learn latent spaces that correspond to high level concepts,", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 720, + 335, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 335, + 732 + ], + "score": 1.0, + "content": "this is not sufficient: we need to use labeled data as well.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27 + } + ], + "page_idx": 14, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 310, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 13 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 108, + 82, + 504, + 115 + ], + "lines": [], + "index": 1, + "bbox_fs": [ + 105, + 82, + 505, + 117 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 106, + 121, + 506, + 209 + ], + "lines": [ + { + "bbox": [ + 105, + 121, + 506, + 135 + ], + "spans": [ + { + "bbox": [ + 105, + 121, + 506, + 135 + ], + "score": 1.0, + "content": "We repeat the above process of sampling labels, and applying corresponding transformations, to", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 133, + 506, + 144 + ], + "spans": [ + { + "bbox": [ + 105, + 133, + 506, + 144 + ], + "score": 1.0, + "content": "generate images 10 times for each image in the original MNIST dataset. Each trial samples labels", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 144, + 506, + 156 + ], + "spans": [ + { + "bbox": [ + 105, + 144, + 506, + 156 + ], + "score": 1.0, + "content": "from a uniform categorical distribution over the sample space for the corresponding attribute. Thus,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 154, + 506, + 166 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 506, + 166 + ], + "score": 1.0, + "content": "we get a new MNIST-A dataset with 700,000 images from the original MNIST dataset of 70,000", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 106, + 165, + 335, + 178 + ], + "score": 1.0, + "content": "images. We split the images into a train, val and test set of", + "type": "text" + }, + { + "bbox": [ + 335, + 165, + 354, + 176 + ], + "score": 0.85, + "content": "85 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 165, + 357, + 178 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 358, + 165, + 372, + 176 + ], + "score": 0.81, + "content": "5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 165, + 393, + 178 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 393, + 165, + 412, + 176 + ], + "score": 0.87, + "content": "10 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "of the data respectively", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 104, + 176, + 506, + 189 + ], + "spans": [ + { + "bbox": [ + 104, + 176, + 375, + 189 + ], + "score": 1.0, + "content": "to create the IID split. 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Each small digit", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 613, + 505, + 625 + ], + "spans": [ + { + "bbox": [ + 105, + 613, + 226, + 625 + ], + "score": 1.0, + "content": "is a single sample generated from", + "type": "text" + }, + { + "bbox": [ + 227, + 613, + 252, + 624 + ], + "score": 0.92, + "content": "p ( x | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 613, + 357, + 625 + ], + "score": 1.0, + "content": "from the corresponding point", + "type": "text" + }, + { + "bbox": [ + 358, + 614, + 364, + 622 + ], + "score": 0.78, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 613, + 431, + 625 + ], + "score": 1.0, + "content": "in latent space. (a)", + "type": "text" + }, + { + "bbox": [ + 432, + 613, + 438, + 623 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 613, + 505, + 625 + ], + "score": 1.0, + "content": "-VAE fit to images", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 623, + 505, + 634 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 257, + 634 + ], + "score": 1.0, + "content": "without annotations. The color of a point", + "type": "text" + }, + { + "bbox": [ + 257, + 625, + 263, + 632 + ], + "score": 0.8, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 263, + 623, + 505, + 634 + ], + "score": 1.0, + "content": "is inferred from looking at the attributes of the training image that", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 223, + 645 + ], + "score": 1.0, + "content": "maps to this point of space using", + "type": "text" + }, + { + "bbox": [ + 223, + 633, + 248, + 644 + ], + "score": 0.91, + "content": "q ( z | x )", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 633, + 505, + 645 + ], + "score": 1.0, + "content": ". Note that the red region (corresponding to the concept of large and even", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 642, + 506, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 642, + 458, + 654 + ], + "score": 1.0, + "content": "digits) is almost non existent. (b) Joint-VAE fit to images with annotations. The color of a point", + "type": "text" + }, + { + "bbox": [ + 458, + 644, + 464, + 652 + ], + "score": 0.79, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 465, + 642, + 506, + 654 + ], + "score": 1.0, + "content": "is inferred", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 651, + 156, + 666 + ], + "spans": [ + { + "bbox": [ + 104, + 651, + 126, + 666 + ], + "score": 1.0, + "content": "from", + "type": "text" + }, + { + "bbox": [ + 126, + 653, + 151, + 664 + ], + "score": 0.91, + "content": "p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 651, + 156, + 666 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 21.5 + } + ], + "index": 19.25 + }, + { + "type": "text", + "bbox": [ + 107, + 676, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 107, + 676, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 107, + 677, + 114, + 688 + ], + "score": 0.82, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 676, + 506, + 689 + ], + "score": 1.0, + "content": "-VAE Higgins et al. (2017a) is an approach that aims to learn disentangled latent spaces. It does", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 339, + 700 + ], + "score": 1.0, + "content": "this by modifying the ELBO objective, so that it scales the", + "type": "text" + }, + { + "bbox": [ + 340, + 688, + 410, + 699 + ], + "score": 0.9, + "content": "\\mathrm { K L } ( q ( \\mathbf { z } | \\mathbf { x } ) , p ( \\mathbf { z } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 687, + 477, + 700 + ], + "score": 1.0, + "content": "term by a factor", + "type": "text" + }, + { + "bbox": [ + 478, + 688, + 503, + 699 + ], + "score": 0.9, + "content": "\\beta > 1", + "type": "inline_equation" + }, + { + "bbox": [ + 503, + 687, + 506, + 700 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 698, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 317, + 711 + ], + "score": 1.0, + "content": "This gives rise to disentangled spaces since the prior", + "type": "text" + }, + { + "bbox": [ + 318, + 700, + 389, + 711 + ], + "score": 0.94, + "content": "p ( \\mathbf { z } ) = \\mathcal { N } ( \\mathbf { z } | \\mathbf { 0 } , \\mathbf { I } )", + "type": "inline_equation" + }, + { + "bbox": [ + 389, + 698, + 506, + 711 + ], + "score": 1.0, + "content": "is factorized (see (Achille &", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 707, + 507, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 707, + 507, + 723 + ], + "score": 1.0, + "content": "Soatto, 2017) for details). However, to learn latent spaces that correspond to high level concepts,", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 720, + 335, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 335, + 732 + ], + "score": 1.0, + "content": "this is not sufficient: we need to use labeled data as well.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27, + "bbox_fs": [ + 105, + 676, + 507, + 732 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 504, + 115 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "score": 1.0, + "content": "To illustrate this, we set up an experiment where we learn a 2d latent space for standard MNIST digit", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "score": 1.0, + "content": "images, but where we replace the label with two binary attributes: parity (odd vs.even) and magnitude", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 327, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 133, + 117 + ], + "score": 1.0, + "content": "(value", + "type": "text" + }, + { + "bbox": [ + 133, + 105, + 150, + 115 + ], + "score": 0.85, + "content": "< 5", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 105, + 162, + 117 + ], + "score": 1.0, + "content": "or", + "type": "text" + }, + { + "bbox": [ + 162, + 105, + 187, + 115 + ], + "score": 0.87, + "content": "> = 5", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 105, + 327, + 117 + ], + "score": 1.0, + "content": "). We call this dataset MNIST-2bit.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 107, + 121, + 505, + 242 + ], + "lines": [ + { + "bbox": [ + 105, + 120, + 505, + 135 + ], + "spans": [ + { + "bbox": [ + 105, + 120, + 301, + 135 + ], + "score": 1.0, + "content": "In Figure 8(a), we show the results of fitting a 2d", + "type": "text" + }, + { + "bbox": [ + 302, + 122, + 309, + 133 + ], + "score": 0.78, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 120, + 505, + 135 + ], + "score": 1.0, + "content": "-VAE model (Higgins et al., 2017a) to the images", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 132, + 505, + 145 + ], + "spans": [ + { + "bbox": [ + 105, + 132, + 441, + 145 + ], + "score": 1.0, + "content": "in MNIST-2bit, ignoring the attributes. 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At each point", + "type": "text" + }, + { + "bbox": [ + 497, + 146, + 504, + 153 + ], + "score": 0.74, + "content": "z", + "type": "inline_equation" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 154, + 505, + 167 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 355, + 167 + ], + "score": 1.0, + "content": "in the latent 2d space, we show a single image sampled from", + "type": "text" + }, + { + "bbox": [ + 355, + 154, + 382, + 166 + ], + "score": 0.92, + "content": "p ( x | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 154, + 505, + 167 + ], + "score": 1.0, + "content": ". To derive the colors for each", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 105, + 165, + 409, + 178 + ], + "score": 1.0, + "content": "point in latent space, we proceed as follows: we embed each training image", + "type": "text" + }, + { + "bbox": [ + 409, + 167, + 416, + 175 + ], + "score": 0.75, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 165, + 462, + 178 + ], + "score": 1.0, + "content": "(with label", + "type": "text" + }, + { + "bbox": [ + 463, + 165, + 484, + 177 + ], + "score": 0.86, + "content": "y ( x ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "into", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 176, + 507, + 191 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 216, + 191 + ], + "score": 1.0, + "content": "latent space, by computing", + "type": "text" + }, + { + "bbox": [ + 216, + 176, + 288, + 189 + ], + "score": 0.92, + "content": "\\hat { z } ( x ) = E _ { q ( z | x ) } [ z ]", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 176, + 388, + 191 + ], + "score": 1.0, + "content": ". We then associate label", + "type": "text" + }, + { + "bbox": [ + 388, + 176, + 408, + 188 + ], + "score": 0.92, + "content": "y ( x )", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 176, + 507, + 191 + ], + "score": 1.0, + "content": "with this point in space.", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 186, + 506, + 201 + ], + "spans": [ + { + "bbox": [ + 105, + 186, + 271, + 201 + ], + "score": 1.0, + "content": "To derive the label for an arbitrary point", + "type": "text" + }, + { + "bbox": [ + 271, + 190, + 277, + 197 + ], + "score": 0.72, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 278, + 186, + 506, + 201 + ], + "score": 1.0, + "content": ", we lookup the closest embedded training image (using", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 198, + 506, + 211 + ], + "spans": [ + { + "bbox": [ + 106, + 198, + 117, + 209 + ], + "score": 0.86, + "content": "\\ell _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 117, + 198, + 164, + 211 + ], + "score": 1.0, + "content": "distance in", + "type": "text" + }, + { + "bbox": [ + 164, + 200, + 172, + 208 + ], + "score": 0.74, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 198, + 506, + 211 + ], + "score": 1.0, + "content": "space), and use its corresponding label. We see that the latent space is useful for", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 209, + 505, + 222 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 505, + 222 + ], + "score": 1.0, + "content": "autoencoding (since the generated images look good), but it does not capture the relevant semantic", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 220, + 506, + 232 + ], + "spans": [ + { + "bbox": [ + 105, + 220, + 506, + 232 + ], + "score": 1.0, + "content": "properties of parity and magnitude. In fact, we argue that there is no way of forcing the model to", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 231, + 468, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 468, + 244 + ], + "score": 1.0, + "content": "learn a latent space that captures such high level conceptual properties from images alone.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 107, + 247, + 505, + 314 + ], + "lines": [ + { + "bbox": [ + 105, + 246, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 246, + 505, + 261 + ], + "score": 1.0, + "content": "In Figure 8(b), we show the results of fitting a joint VAE model to MNIST-2bit, by optimizing", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 258, + 505, + 272 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 149, + 271 + ], + "score": 0.91, + "content": "\\mathrm { e l b o } ( x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 258, + 421, + 272 + ], + "score": 1.0, + "content": "on images and attributes (i.e., we do not include the uni-modality", + "type": "text" + }, + { + "bbox": [ + 421, + 259, + 453, + 271 + ], + "score": 0.71, + "content": "\\operatorname { e l b o } ( x )", + "type": "inline_equation" + }, + { + "bbox": [ + 454, + 258, + 473, + 272 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 473, + 259, + 505, + 271 + ], + "score": 0.62, + "content": "\\operatorname { e l b o } ( y )", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 270, + 505, + 282 + ], + "spans": [ + { + "bbox": [ + 106, + 270, + 373, + 282 + ], + "score": 1.0, + "content": "terms in this experiment.) Now the color codes are derived from", + "type": "text" + }, + { + "bbox": [ + 373, + 270, + 400, + 282 + ], + "score": 0.93, + "content": "p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 270, + 505, + 282 + ], + "score": 1.0, + "content": "rather than using nearest", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "score": 1.0, + "content": "neighbor retrieval. We see that the latent space autoencodes well, and also captures the 4 relevant", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 291, + 506, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 506, + 304 + ], + "score": 1.0, + "content": "types of concepts. In particular, the regions are all convex and linearly seperable, which facilitates the", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 303, + 506, + 316 + ], + "spans": [ + { + "bbox": [ + 105, + 303, + 267, + 316 + ], + "score": 1.0, + "content": "learning of a good imagination function", + "type": "text" + }, + { + "bbox": [ + 268, + 303, + 294, + 315 + ], + "score": 0.93, + "content": "q ( z | y )", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 303, + 506, + 316 + ], + "score": 1.0, + "content": ", interpolation, retrieval, and other latent-space tasks.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 16.5 + }, + { + "type": "text", + "bbox": [ + 106, + 320, + 505, + 429 + ], + "lines": [ + { + "bbox": [ + 106, + 320, + 505, + 332 + ], + "spans": [ + { + "bbox": [ + 106, + 320, + 505, + 332 + ], + "score": 1.0, + "content": "A skeptic might complain that we have created an arbitrary partitioning of the data, that is unrelated to", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 331, + 506, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 331, + 506, + 343 + ], + "score": 1.0, + "content": "the appearance of the objects, and that learning such concepts is therefore “unnatural”. But consider", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 341, + 506, + 354 + ], + "spans": [ + { + "bbox": [ + 105, + 341, + 506, + 354 + ], + "score": 1.0, + "content": "an agent interacting with an environment by touching digits on a screen. Suppose the amount of", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "score": 1.0, + "content": "reward they get depends on whether the digit that they touch is small or big, or odd or even. In such", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 364, + 505, + 375 + ], + "spans": [ + { + "bbox": [ + 106, + 364, + 505, + 375 + ], + "score": 1.0, + "content": "an environment, it would be very useful for the agent to structure its internal representation to capture", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 375, + 506, + 386 + ], + "spans": [ + { + "bbox": [ + 106, + 375, + 506, + 386 + ], + "score": 1.0, + "content": "the concepts of magnitude and parity, rather than in terms of low level visual similarity. (In fact,", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "score": 1.0, + "content": "(Scarf et al., 2011) showed that pigeons can learn simple numerical concepts, such as magnitude,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 396, + 506, + 409 + ], + "spans": [ + { + "bbox": [ + 106, + 396, + 506, + 409 + ], + "score": 1.0, + "content": "by rewarding them for doing exactly this!) Language can be considered as the realization of such", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 407, + 506, + 420 + ], + "spans": [ + { + "bbox": [ + 105, + 407, + 506, + 420 + ], + "score": 1.0, + "content": "concepts, which enables agents to share useful information about their common environments more", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 417, + 135, + 432 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 135, + 432 + ], + "score": 1.0, + "content": "easily.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 24.5 + }, + { + "type": "title", + "bbox": [ + 107, + 444, + 362, + 455 + ], + "lines": [ + { + "bbox": [ + 106, + 444, + 363, + 455 + ], + "spans": [ + { + "bbox": [ + 106, + 444, + 363, + 455 + ], + "score": 1.0, + "content": "A.4 DETAILS OF THE NEURAL NETWORK ARCHITECTURES", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 30 + }, + { + "type": "text", + "bbox": [ + 108, + 464, + 505, + 519 + ], + "lines": [ + { + "bbox": [ + 106, + 464, + 505, + 477 + ], + "spans": [ + { + "bbox": [ + 106, + 464, + 379, + 477 + ], + "score": 1.0, + "content": "As explained in the main paper, we fit the joint graphical model", + "type": "text" + }, + { + "bbox": [ + 380, + 464, + 505, + 477 + ], + "score": 0.92, + "content": "p ( x , y , z ) = p ( z ) p ( x | z ) p ( y | z )", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 474, + 506, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 474, + 210, + 488 + ], + "score": 1.0, + "content": "with inference networks", + "type": "text" + }, + { + "bbox": [ + 210, + 475, + 247, + 487 + ], + "score": 0.84, + "content": "q ( z | x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 474, + 252, + 488 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 253, + 475, + 280, + 487 + ], + "score": 0.71, + "content": "q ( z | x )", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 474, + 304, + 488 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 304, + 475, + 330, + 487 + ], + "score": 0.93, + "content": "q ( z | y )", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 474, + 506, + 488 + ], + "score": 1.0, + "content": ". Thus, our overall model is made up of", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 486, + 505, + 498 + ], + "spans": [ + { + "bbox": [ + 106, + 486, + 226, + 498 + ], + "score": 1.0, + "content": "three encoders (denoted with", + "type": "text" + }, + { + "bbox": [ + 227, + 488, + 233, + 498 + ], + "score": 0.66, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 486, + 369, + 498 + ], + "score": 1.0, + "content": ") and two decoders (denoted with", + "type": "text" + }, + { + "bbox": [ + 370, + 488, + 376, + 498 + ], + "score": 0.73, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 486, + 505, + 498 + ], + "score": 1.0, + "content": "). Across all models we use the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 496, + 505, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 496, + 505, + 510 + ], + "score": 1.0, + "content": "exponential linear unit (ELU) which is a leaky non-linearity often used to train VAEs. We explain the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 507, + 246, + 521 + ], + "spans": [ + { + "bbox": [ + 105, + 507, + 246, + 521 + ], + "score": 1.0, + "content": "architectures in more detail below.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 33 + }, + { + "type": "title", + "bbox": [ + 107, + 525, + 232, + 536 + ], + "lines": [ + { + "bbox": [ + 105, + 524, + 234, + 538 + ], + "spans": [ + { + "bbox": [ + 105, + 524, + 234, + 538 + ], + "score": 1.0, + "content": "MNIST-A model architecture", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 36 + }, + { + "type": "text", + "bbox": [ + 133, + 547, + 504, + 580 + ], + "lines": [ + { + "bbox": [ + 132, + 546, + 506, + 560 + ], + "spans": [ + { + "bbox": [ + 132, + 546, + 205, + 560 + ], + "score": 1.0, + "content": "• Image decoder,", + "type": "text" + }, + { + "bbox": [ + 205, + 547, + 232, + 559 + ], + "score": 0.92, + "content": "p ( x | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 233, + 546, + 506, + 560 + ], + "score": 1.0, + "content": ": Our architecture for the image decoder exactly follows the standard", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 141, + 558, + 505, + 571 + ], + "spans": [ + { + "bbox": [ + 141, + 558, + 505, + 571 + ], + "score": 1.0, + "content": "DCGAN architecture from (Radford et al., 2016), where the input to the model is the latent", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 141, + 569, + 213, + 580 + ], + "spans": [ + { + "bbox": [ + 141, + 569, + 213, + 580 + ], + "score": 1.0, + "content": "state of the VAE.", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 38 + }, + { + "type": "text", + "bbox": [ + 132, + 584, + 505, + 628 + ], + "lines": [ + { + "bbox": [ + 131, + 583, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 131, + 583, + 207, + 598 + ], + "score": 1.0, + "content": "• Label decoder,", + "type": "text" + }, + { + "bbox": [ + 207, + 585, + 234, + 596 + ], + "score": 0.93, + "content": "p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 583, + 464, + 598 + ], + "score": 1.0, + "content": ": Our label decoder assumes a factorized output space", + "type": "text" + }, + { + "bbox": [ + 464, + 585, + 505, + 596 + ], + "score": 0.9, + "content": "p ( y | z ) =", + "type": "inline_equation" + } + ], + "index": 40 + }, + { + "bbox": [ + 142, + 594, + 507, + 609 + ], + "spans": [ + { + "bbox": [ + 142, + 595, + 201, + 609 + ], + "score": 0.91, + "content": "\\textstyle \\prod _ { k \\in { \\mathcal { A } } } p ( y _ { k } | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 594, + 232, + 609 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 232, + 597, + 243, + 607 + ], + "score": 0.86, + "content": "y _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 594, + 445, + 609 + ], + "score": 1.0, + "content": "is each individual attribute. We parameterize each", + "type": "text" + }, + { + "bbox": [ + 445, + 596, + 477, + 608 + ], + "score": 0.93, + "content": "p ( y _ { k } | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 594, + 507, + 609 + ], + "score": 1.0, + "content": "with a", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 142, + 607, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 142, + 607, + 427, + 618 + ], + "score": 1.0, + "content": "two-layer MLP with 128 hidden units each. We apply a small amount of", + "type": "text" + }, + { + "bbox": [ + 427, + 607, + 437, + 618 + ], + "score": 0.87, + "content": "\\ell _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 607, + 505, + 618 + ], + "score": 1.0, + "content": "regularization to", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 141, + 617, + 226, + 630 + ], + "spans": [ + { + "bbox": [ + 141, + 617, + 226, + 630 + ], + "score": 1.0, + "content": "the weight matrices.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 41.5 + }, + { + "type": "text", + "bbox": [ + 133, + 632, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 132, + 632, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 132, + 632, + 245, + 646 + ], + "score": 1.0, + "content": "• Image and Label encoder,", + "type": "text" + }, + { + "bbox": [ + 246, + 633, + 282, + 645 + ], + "score": 0.93, + "content": "q ( z | x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 283, + 632, + 506, + 646 + ], + "score": 1.0, + "content": ": Our architecture (Figure 9) for the image-label encoder", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 141, + 643, + 506, + 657 + ], + "spans": [ + { + "bbox": [ + 141, + 643, + 506, + 657 + ], + "score": 1.0, + "content": "first separately processes the images and the labels, and then concatenates them downstream", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 141, + 655, + 506, + 667 + ], + "spans": [ + { + "bbox": [ + 141, + 655, + 506, + 667 + ], + "score": 1.0, + "content": "in the network and then passes the concatenated features through a multi-layered perceptron.", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 141, + 666, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 141, + 666, + 506, + 678 + ], + "score": 1.0, + "content": "More specifically, we have convolutional layers which process image into 32, 64, 128, 16", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 141, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 141, + 677, + 244, + 689 + ], + "score": 1.0, + "content": "feature maps with strides", + "type": "text" + }, + { + "bbox": [ + 244, + 677, + 279, + 688 + ], + "score": 0.5, + "content": "1 , 2 , 2 , 2", + "type": "inline_equation" + }, + { + "bbox": [ + 279, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "in the corresponding layers. We use batch normalization", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 141, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 141, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "in the convolutional layers before applying the ELU non-linearity. On the label encoder", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 141, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 141, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "side, we first encode the each attribute label into a 32d continuous vector and then pass", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 141, + 710, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 141, + 710, + 506, + 722 + ], + "score": 1.0, + "content": "each individual attribute vector through a 2-layered MLP with 512 hidden dimensions each.", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 141, + 721, + 506, + 732 + ], + "spans": [ + { + "bbox": [ + 141, + 721, + 506, + 732 + ], + "score": 1.0, + "content": "For example, for MNIST-A we have 4 attributes, which gives us 4 vectors of 512d. We", + "type": "text" + } + ], + "index": 52 + } + ], + "index": 48 + } + ], + "page_idx": 15, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 752, + 310, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 13 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 504, + 115 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 506, + 95 + ], + "score": 1.0, + "content": "To illustrate this, we set up an experiment where we learn a 2d latent space for standard MNIST digit", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "score": 1.0, + "content": "images, but where we replace the label with two binary attributes: parity (odd vs.even) and magnitude", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 327, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 133, + 117 + ], + "score": 1.0, + "content": "(value", + "type": "text" + }, + { + "bbox": [ + 133, + 105, + 150, + 115 + ], + "score": 0.85, + "content": "< 5", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 105, + 162, + 117 + ], + "score": 1.0, + "content": "or", + "type": "text" + }, + { + "bbox": [ + 162, + 105, + 187, + 115 + ], + "score": 0.87, + "content": "> = 5", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 105, + 327, + 117 + ], + "score": 1.0, + "content": "). We call this dataset MNIST-2bit.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1, + "bbox_fs": [ + 105, + 81, + 506, + 117 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 121, + 505, + 242 + ], + "lines": [ + { + "bbox": [ + 105, + 120, + 505, + 135 + ], + "spans": [ + { + "bbox": [ + 105, + 120, + 301, + 135 + ], + "score": 1.0, + "content": "In Figure 8(a), we show the results of fitting a 2d", + "type": "text" + }, + { + "bbox": [ + 302, + 122, + 309, + 133 + ], + "score": 0.78, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 120, + 505, + 135 + ], + "score": 1.0, + "content": "-VAE model (Higgins et al., 2017a) to the images", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 132, + 505, + 145 + ], + "spans": [ + { + "bbox": [ + 105, + 132, + 441, + 145 + ], + "score": 1.0, + "content": "in MNIST-2bit, ignoring the attributes. We perform a hyperparameter sweep over", + "type": "text" + }, + { + "bbox": [ + 442, + 133, + 449, + 144 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 132, + 505, + 145 + ], + "score": 1.0, + "content": ", and pick the", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 143, + 504, + 156 + ], + "spans": [ + { + "bbox": [ + 105, + 143, + 402, + 156 + ], + "score": 1.0, + "content": "one that gives the best looking latent space (this corresponds to a value of", + "type": "text" + }, + { + "bbox": [ + 402, + 144, + 433, + 155 + ], + "score": 0.91, + "content": "\\beta = 1 0", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 143, + 497, + 156 + ], + "score": 1.0, + "content": "). At each point", + "type": "text" + }, + { + "bbox": [ + 497, + 146, + 504, + 153 + ], + "score": 0.74, + "content": "z", + "type": "inline_equation" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 154, + 505, + 167 + ], + "spans": [ + { + "bbox": [ + 105, + 154, + 355, + 167 + ], + "score": 1.0, + "content": "in the latent 2d space, we show a single image sampled from", + "type": "text" + }, + { + "bbox": [ + 355, + 154, + 382, + 166 + ], + "score": 0.92, + "content": "p ( x | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 154, + 505, + 167 + ], + "score": 1.0, + "content": ". To derive the colors for each", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 165, + 506, + 178 + ], + "spans": [ + { + "bbox": [ + 105, + 165, + 409, + 178 + ], + "score": 1.0, + "content": "point in latent space, we proceed as follows: we embed each training image", + "type": "text" + }, + { + "bbox": [ + 409, + 167, + 416, + 175 + ], + "score": 0.75, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 165, + 462, + 178 + ], + "score": 1.0, + "content": "(with label", + "type": "text" + }, + { + "bbox": [ + 463, + 165, + 484, + 177 + ], + "score": 0.86, + "content": "y ( x ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 165, + 506, + 178 + ], + "score": 1.0, + "content": "into", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 176, + 507, + 191 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 216, + 191 + ], + "score": 1.0, + "content": "latent space, by computing", + "type": "text" + }, + { + "bbox": [ + 216, + 176, + 288, + 189 + ], + "score": 0.92, + "content": "\\hat { z } ( x ) = E _ { q ( z | x ) } [ z ]", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 176, + 388, + 191 + ], + "score": 1.0, + "content": ". We then associate label", + "type": "text" + }, + { + "bbox": [ + 388, + 176, + 408, + 188 + ], + "score": 0.92, + "content": "y ( x )", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 176, + 507, + 191 + ], + "score": 1.0, + "content": "with this point in space.", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 186, + 506, + 201 + ], + "spans": [ + { + "bbox": [ + 105, + 186, + 271, + 201 + ], + "score": 1.0, + "content": "To derive the label for an arbitrary point", + "type": "text" + }, + { + "bbox": [ + 271, + 190, + 277, + 197 + ], + "score": 0.72, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 278, + 186, + 506, + 201 + ], + "score": 1.0, + "content": ", we lookup the closest embedded training image (using", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 198, + 506, + 211 + ], + "spans": [ + { + "bbox": [ + 106, + 198, + 117, + 209 + ], + "score": 0.86, + "content": "\\ell _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 117, + 198, + 164, + 211 + ], + "score": 1.0, + "content": "distance in", + "type": "text" + }, + { + "bbox": [ + 164, + 200, + 172, + 208 + ], + "score": 0.74, + "content": "z", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 198, + 506, + 211 + ], + "score": 1.0, + "content": "space), and use its corresponding label. We see that the latent space is useful for", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 209, + 505, + 222 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 505, + 222 + ], + "score": 1.0, + "content": "autoencoding (since the generated images look good), but it does not capture the relevant semantic", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 220, + 506, + 232 + ], + "spans": [ + { + "bbox": [ + 105, + 220, + 506, + 232 + ], + "score": 1.0, + "content": "properties of parity and magnitude. In fact, we argue that there is no way of forcing the model to", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 231, + 468, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 468, + 244 + ], + "score": 1.0, + "content": "learn a latent space that captures such high level conceptual properties from images alone.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 8, + "bbox_fs": [ + 105, + 120, + 507, + 244 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 247, + 505, + 314 + ], + "lines": [ + { + "bbox": [ + 105, + 246, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 246, + 505, + 261 + ], + "score": 1.0, + "content": "In Figure 8(b), we show the results of fitting a joint VAE model to MNIST-2bit, by optimizing", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 258, + 505, + 272 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 149, + 271 + ], + "score": 0.91, + "content": "\\mathrm { e l b o } ( x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 258, + 421, + 272 + ], + "score": 1.0, + "content": "on images and attributes (i.e., we do not include the uni-modality", + "type": "text" + }, + { + "bbox": [ + 421, + 259, + 453, + 271 + ], + "score": 0.71, + "content": "\\operatorname { e l b o } ( x )", + "type": "inline_equation" + }, + { + "bbox": [ + 454, + 258, + 473, + 272 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 473, + 259, + 505, + 271 + ], + "score": 0.62, + "content": "\\operatorname { e l b o } ( y )", + "type": "inline_equation" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 270, + 505, + 282 + ], + "spans": [ + { + "bbox": [ + 106, + 270, + 373, + 282 + ], + "score": 1.0, + "content": "terms in this experiment.) Now the color codes are derived from", + "type": "text" + }, + { + "bbox": [ + 373, + 270, + 400, + 282 + ], + "score": 0.93, + "content": "p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 270, + 505, + 282 + ], + "score": 1.0, + "content": "rather than using nearest", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "score": 1.0, + "content": "neighbor retrieval. We see that the latent space autoencodes well, and also captures the 4 relevant", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 291, + 506, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 506, + 304 + ], + "score": 1.0, + "content": "types of concepts. In particular, the regions are all convex and linearly seperable, which facilitates the", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 303, + 506, + 316 + ], + "spans": [ + { + "bbox": [ + 105, + 303, + 267, + 316 + ], + "score": 1.0, + "content": "learning of a good imagination function", + "type": "text" + }, + { + "bbox": [ + 268, + 303, + 294, + 315 + ], + "score": 0.93, + "content": "q ( z | y )", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 303, + 506, + 316 + ], + "score": 1.0, + "content": ", interpolation, retrieval, and other latent-space tasks.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 16.5, + "bbox_fs": [ + 105, + 246, + 506, + 316 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 320, + 505, + 429 + ], + "lines": [ + { + "bbox": [ + 106, + 320, + 505, + 332 + ], + "spans": [ + { + "bbox": [ + 106, + 320, + 505, + 332 + ], + "score": 1.0, + "content": "A skeptic might complain that we have created an arbitrary partitioning of the data, that is unrelated to", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 331, + 506, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 331, + 506, + 343 + ], + "score": 1.0, + "content": "the appearance of the objects, and that learning such concepts is therefore “unnatural”. But consider", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 341, + 506, + 354 + ], + "spans": [ + { + "bbox": [ + 105, + 341, + 506, + 354 + ], + "score": 1.0, + "content": "an agent interacting with an environment by touching digits on a screen. Suppose the amount of", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "score": 1.0, + "content": "reward they get depends on whether the digit that they touch is small or big, or odd or even. In such", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 364, + 505, + 375 + ], + "spans": [ + { + "bbox": [ + 106, + 364, + 505, + 375 + ], + "score": 1.0, + "content": "an environment, it would be very useful for the agent to structure its internal representation to capture", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 375, + 506, + 386 + ], + "spans": [ + { + "bbox": [ + 106, + 375, + 506, + 386 + ], + "score": 1.0, + "content": "the concepts of magnitude and parity, rather than in terms of low level visual similarity. (In fact,", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 506, + 398 + ], + "score": 1.0, + "content": "(Scarf et al., 2011) showed that pigeons can learn simple numerical concepts, such as magnitude,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 396, + 506, + 409 + ], + "spans": [ + { + "bbox": [ + 106, + 396, + 506, + 409 + ], + "score": 1.0, + "content": "by rewarding them for doing exactly this!) Language can be considered as the realization of such", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 407, + 506, + 420 + ], + "spans": [ + { + "bbox": [ + 105, + 407, + 506, + 420 + ], + "score": 1.0, + "content": "concepts, which enables agents to share useful information about their common environments more", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 417, + 135, + 432 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 135, + 432 + ], + "score": 1.0, + "content": "easily.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 24.5, + "bbox_fs": [ + 105, + 320, + 506, + 432 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 444, + 362, + 455 + ], + "lines": [ + { + "bbox": [ + 106, + 444, + 363, + 455 + ], + "spans": [ + { + "bbox": [ + 106, + 444, + 363, + 455 + ], + "score": 1.0, + "content": "A.4 DETAILS OF THE NEURAL NETWORK ARCHITECTURES", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 30 + }, + { + "type": "text", + "bbox": [ + 108, + 464, + 505, + 519 + ], + "lines": [ + { + "bbox": [ + 106, + 464, + 505, + 477 + ], + "spans": [ + { + "bbox": [ + 106, + 464, + 379, + 477 + ], + "score": 1.0, + "content": "As explained in the main paper, we fit the joint graphical model", + "type": "text" + }, + { + "bbox": [ + 380, + 464, + 505, + 477 + ], + "score": 0.92, + "content": "p ( x , y , z ) = p ( z ) p ( x | z ) p ( y | z )", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 474, + 506, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 474, + 210, + 488 + ], + "score": 1.0, + "content": "with inference networks", + "type": "text" + }, + { + "bbox": [ + 210, + 475, + 247, + 487 + ], + "score": 0.84, + "content": "q ( z | x , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 474, + 252, + 488 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 253, + 475, + 280, + 487 + ], + "score": 0.71, + "content": "q ( z | x )", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 474, + 304, + 488 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 304, + 475, + 330, + 487 + ], + "score": 0.93, + "content": "q ( z | y )", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 474, + 506, + 488 + ], + "score": 1.0, + "content": ". Thus, our overall model is made up of", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 486, + 505, + 498 + ], + "spans": [ + { + "bbox": [ + 106, + 486, + 226, + 498 + ], + "score": 1.0, + "content": "three encoders (denoted with", + "type": "text" + }, + { + "bbox": [ + 227, + 488, + 233, + 498 + ], + "score": 0.66, + "content": "q", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 486, + 369, + 498 + ], + "score": 1.0, + "content": ") and two decoders (denoted with", + "type": "text" + }, + { + "bbox": [ + 370, + 488, + 376, + 498 + ], + "score": 0.73, + "content": "p", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 486, + 505, + 498 + ], + "score": 1.0, + "content": "). Across all models we use the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 496, + 505, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 496, + 505, + 510 + ], + "score": 1.0, + "content": "exponential linear unit (ELU) which is a leaky non-linearity often used to train VAEs. We explain the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 507, + 246, + 521 + ], + "spans": [ + { + "bbox": [ + 105, + 507, + 246, + 521 + ], + "score": 1.0, + "content": "architectures in more detail below.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 33, + "bbox_fs": [ + 105, + 464, + 506, + 521 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 525, + 232, + 536 + ], + "lines": [ + { + "bbox": [ + 105, + 524, + 234, + 538 + ], + "spans": [ + { + "bbox": [ + 105, + 524, + 234, + 538 + ], + "score": 1.0, + "content": "MNIST-A model architecture", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 36 + }, + { + "type": "text", + "bbox": [ + 133, + 547, + 504, + 580 + ], + "lines": [ + { + "bbox": [ + 132, + 546, + 506, + 560 + ], + "spans": [ + { + "bbox": [ + 132, + 546, + 205, + 560 + ], + "score": 1.0, + "content": "• Image decoder,", + "type": "text" + }, + { + "bbox": [ + 205, + 547, + 232, + 559 + ], + "score": 0.92, + "content": "p ( x | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 233, + 546, + 506, + 560 + ], + "score": 1.0, + "content": ": Our architecture for the image decoder exactly follows the standard", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 141, + 558, + 505, + 571 + ], + "spans": [ + { + "bbox": [ + 141, + 558, + 505, + 571 + ], + "score": 1.0, + "content": "DCGAN architecture from (Radford et al., 2016), where the input to the model is the latent", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 141, + 569, + 213, + 580 + ], + "spans": [ + { + "bbox": [ + 141, + 569, + 213, + 580 + ], + "score": 1.0, + "content": "state of the VAE.", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 38, + "bbox_fs": [ + 132, + 546, + 506, + 580 + ] + }, + { + "type": "text", + "bbox": [ + 132, + 584, + 505, + 628 + ], + "lines": [ + { + "bbox": [ + 131, + 583, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 131, + 583, + 207, + 598 + ], + "score": 1.0, + "content": "• Label decoder,", + "type": "text" + }, + { + "bbox": [ + 207, + 585, + 234, + 596 + ], + "score": 0.93, + "content": "p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 583, + 464, + 598 + ], + "score": 1.0, + "content": ": Our label decoder assumes a factorized output space", + "type": "text" + }, + { + "bbox": [ + 464, + 585, + 505, + 596 + ], + "score": 0.9, + "content": "p ( y | z ) =", + "type": "inline_equation" + } + ], + "index": 40 + }, + { + "bbox": [ + 142, + 594, + 507, + 609 + ], + "spans": [ + { + "bbox": [ + 142, + 595, + 201, + 609 + ], + "score": 0.91, + "content": "\\textstyle \\prod _ { k \\in { \\mathcal { A } } } p ( y _ { k } | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 594, + 232, + 609 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 232, + 597, + 243, + 607 + ], + "score": 0.86, + "content": "y _ { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 594, + 445, + 609 + ], + "score": 1.0, + "content": "is each individual attribute. We parameterize each", + "type": "text" + }, + { + "bbox": [ + 445, + 596, + 477, + 608 + ], + "score": 0.93, + "content": "p ( y _ { k } | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 594, + 507, + 609 + ], + "score": 1.0, + "content": "with a", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 142, + 607, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 142, + 607, + 427, + 618 + ], + "score": 1.0, + "content": "two-layer MLP with 128 hidden units each. 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In addition, we also", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 696, + 506, + 713 + ], + "spans": [ + { + "bbox": [ + 105, + 696, + 343, + 713 + ], + "score": 1.0, + "content": "discuss how the private hyperparamter choices for each loss,", + "type": "text" + }, + { + "bbox": [ + 343, + 701, + 351, + 710 + ], + "score": 0.83, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 351, + 696, + 401, + 713 + ], + "score": 1.0, + "content": "for TELBO,", + "type": "text" + }, + { + "bbox": [ + 401, + 701, + 409, + 709 + ], + "score": 0.78, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 696, + 506, + 713 + ], + "score": 1.0, + "content": "for JMVAE, as in Wang", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 185, + 723 + ], + "score": 1.0, + "content": "et al. (2016a)) and", + "type": "text" + }, + { + "bbox": [ + 186, + 711, + 193, + 721 + ], + "score": 0.82, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 708, + 506, + 723 + ], + "score": 1.0, + "content": "for BiVCCA affect performance. We use the JS-overall metric for picking", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 721, + 304, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 304, + 734 + ], + "score": 1.0, + "content": "hyperparameters, as explained in the main paper.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23, + "bbox_fs": [ + 105, + 677, + 506, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 134, + 166, + 474, + 604 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 134, + 166, + 474, + 604 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 134, + 166, + 474, + 604 + ], + "spans": [ + { + "bbox": [ + 134, + 166, + 474, + 604 + ], + "score": 0.976, + "type": "image", + "image_path": "cde83191ec4daa6010cc90c7a347bfde0d62bb6512dfca0f4e7d11dc7eb652b3.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 134, + 166, + 474, + 312.0 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 134, + 312.0, + 474, + 458.0 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 134, + 458.0, + 474, + 604.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 612, + 506, + 653 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 612, + 504, + 623 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 504, + 623 + ], + "score": 1.0, + "content": "Figure 11: Randomly sampled images from the TELBO model when fed randomly sampled concepts from the", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 623, + 505, + 633 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 505, + 633 + ], + "score": 1.0, + "content": "iid training set. We also show the outputs of the observation classifier for the images. Note that we visualize", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 632, + 505, + 643 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 505, + 643 + ], + "score": 1.0, + "content": "mean images above (since they tend to be more human interpretable) but the classifier is fed samples from the", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 641, + 260, + 654 + ], + "spans": [ + { + "bbox": [ + 106, + 641, + 260, + 654 + ], + "score": 1.0, + "content": "model. 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Models are given the unseen compositional query shown", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 237, + 506, + 249 + ], + "spans": [ + { + "bbox": [ + 106, + 237, + 506, + 249 + ], + "score": 1.0, + "content": "at the top and each of the three columns shows the mean of the image distribution generated by the models.", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 248, + 506, + 259 + ], + "spans": [ + { + "bbox": [ + 106, + 248, + 506, + 259 + ], + "score": 1.0, + "content": "Images marked with a red box are those that the observation classifier detected as being incorrect. We also show", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 258, + 505, + 269 + ], + "spans": [ + { + "bbox": [ + 106, + 258, + 505, + 269 + ], + "score": 1.0, + "content": "the classification result from the observation classifier on top of each image. We see that TELBO and JMVAE", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 267, + 320, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 267, + 320, + 279 + ], + "score": 1.0, + "content": "both do really well, while BiVCCA is substantially poorer.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6 + } + ], + "index": 4.0 + }, + { + "type": "text", + "bbox": [ + 131, + 302, + 505, + 423 + ], + "lines": [ + { + "bbox": [ + 129, + 300, + 506, + 315 + ], + "spans": [ + { + "bbox": [ + 129, + 300, + 180, + 315 + ], + "score": 1.0, + "content": "1. Effect of", + "type": "text" + }, + { + "bbox": [ + 181, + 302, + 192, + 314 + ], + "score": 0.87, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 300, + 255, + 315 + ], + "score": 1.0, + "content": ": We search for", + "type": "text" + }, + { + "bbox": [ + 255, + 302, + 267, + 314 + ], + "score": 0.9, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 300, + 336, + 315 + ], + "score": 1.0, + "content": "values in the set", + "type": "text" + }, + { + "bbox": [ + 336, + 302, + 386, + 314 + ], + "score": 0.92, + "content": "\\{ 1 , 5 0 , 1 0 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 300, + 506, + 315 + ], + "score": 1.0, + "content": "for all objectives. In general,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 141, + 313, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 141, + 313, + 227, + 326 + ], + "score": 1.0, + "content": "we find the setting of", + "type": "text" + }, + { + "bbox": [ + 227, + 313, + 239, + 325 + ], + "score": 0.88, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 313, + 506, + 326 + ], + "score": 1.0, + "content": "in the elbo terms to be critical for good performance (especially on", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 141, + 323, + 506, + 338 + ], + "spans": [ + { + "bbox": [ + 141, + 323, + 257, + 338 + ], + "score": 1.0, + "content": "correctness). For example, at", + "type": "text" + }, + { + "bbox": [ + 258, + 324, + 279, + 335 + ], + "score": 0.9, + "content": "\\lambda _ { y } { = } 1", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 323, + 506, + 338 + ], + "score": 1.0, + "content": ", we find that correctness numbers for the best performing", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 142, + 335, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 142, + 335, + 260, + 347 + ], + "score": 1.0, + "content": "TELBO model drop to 60.47", + "type": "text" + }, + { + "bbox": [ + 260, + 336, + 294, + 346 + ], + "score": 0.48, + "content": "( \\pm 0 . 3 4 )", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 335, + 345, + 347 + ], + "score": 1.0, + "content": "(from 82.08", + "type": "text" + }, + { + "bbox": [ + 345, + 335, + 380, + 346 + ], + "score": 0.58, + "content": "( \\pm 0 . 5 6 )", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 335, + 391, + 347 + ], + "score": 1.0, + "content": "at", + "type": "text" + }, + { + "bbox": [ + 391, + 335, + 419, + 347 + ], + "score": 0.9, + "content": "\\lambda _ { y } = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 335, + 505, + 347 + ], + "score": 1.0, + "content": ") on the validation set", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 140, + 345, + 506, + 359 + ], + "spans": [ + { + "bbox": [ + 140, + 345, + 506, + 359 + ], + "score": 1.0, + "content": "for iid queries. 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We have seen", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 141, + 367, + 506, + 381 + ], + "spans": [ + { + "bbox": [ + 141, + 367, + 393, + 381 + ], + "score": 1.0, + "content": "qualitative evidence which shows that the likelihood scaling for", + "type": "text" + }, + { + "bbox": [ + 393, + 368, + 405, + 380 + ], + "score": 0.89, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 367, + 506, + 381 + ], + "score": 1.0, + "content": "affects how disentangled", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 141, + 379, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 141, + 379, + 505, + 391 + ], + "score": 1.0, + "content": "the latent space is along the specified attributes. When the latent space is not grouped or", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 140, + 389, + 506, + 403 + ], + "spans": [ + { + "bbox": [ + 140, + 389, + 506, + 403 + ], + "score": 1.0, + "content": "organized as per high-level attributes (see Figure 8 for example), the posterior distribution", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 142, + 400, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 142, + 401, + 466, + 413 + ], + "score": 1.0, + "content": "for a given concept is multimodal, which is hard for a gaussian inference network", + "type": "text" + }, + { + "bbox": [ + 466, + 400, + 493, + 412 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 401, + 505, + 413 + ], + "score": 1.0, + "content": "to", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 142, + 412, + 329, + 424 + ], + "spans": [ + { + "bbox": [ + 142, + 412, + 329, + 424 + ], + "score": 1.0, + "content": "capture. This leads to poor correctness values.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 131, + 429, + 505, + 506 + ], + "lines": [ + { + "bbox": [ + 128, + 428, + 507, + 442 + ], + "spans": [ + { + "bbox": [ + 128, + 428, + 182, + 442 + ], + "score": 1.0, + "content": "2. Effect of", + "type": "text" + }, + { + "bbox": [ + 182, + 431, + 190, + 441 + ], + "score": 0.78, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 428, + 271, + 442 + ], + "score": 1.0, + "content": ": In addition to the", + "type": "text" + }, + { + "bbox": [ + 272, + 429, + 284, + 441 + ], + "score": 0.89, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 428, + 507, + 442 + ], + "score": 1.0, + "content": "scaling term which is common across all objectives,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 142, + 439, + 505, + 452 + ], + "spans": [ + { + "bbox": [ + 142, + 439, + 203, + 452 + ], + "score": 1.0, + "content": "TELBO has a", + "type": "text" + }, + { + "bbox": [ + 203, + 442, + 211, + 451 + ], + "score": 0.78, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 211, + 439, + 412, + 452 + ], + "score": 1.0, + "content": "scaling factor which controls how we scale the", + "type": "text" + }, + { + "bbox": [ + 412, + 439, + 454, + 452 + ], + "score": 0.93, + "content": "\\log p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 455, + 439, + 505, + 452 + ], + "score": 1.0, + "content": "term in the", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 142, + 450, + 506, + 464 + ], + "spans": [ + { + "bbox": [ + 142, + 451, + 218, + 464 + ], + "score": 0.91, + "content": "\\mathrm { e l b o } _ { \\gamma , 1 } ( \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 450, + 330, + 464 + ], + "score": 1.0, + "content": "term. We sweep values of", + "type": "text" + }, + { + "bbox": [ + 330, + 451, + 379, + 463 + ], + "score": 0.92, + "content": "\\{ 1 , 5 0 , 1 0 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 450, + 506, + 464 + ], + "score": 1.0, + "content": "for this parameter. In general,", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 141, + 462, + 506, + 474 + ], + "spans": [ + { + "bbox": [ + 141, + 462, + 440, + 474 + ], + "score": 1.0, + "content": "we find that the effect of this term is smaller on the performance than the", + "type": "text" + }, + { + "bbox": [ + 440, + 462, + 452, + 474 + ], + "score": 0.89, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 462, + 506, + 474 + ], + "score": 1.0, + "content": "term. Based", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 142, + 473, + 505, + 485 + ], + "spans": [ + { + "bbox": [ + 142, + 473, + 505, + 485 + ], + "score": 1.0, + "content": "on the setting of this parameter, we find that, for example, the correctness values for fully", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 483, + 505, + 496 + ], + "spans": [ + { + "bbox": [ + 141, + 483, + 289, + 496 + ], + "score": 1.0, + "content": "specified queries change from 82.08", + "type": "text" + }, + { + "bbox": [ + 289, + 484, + 320, + 495 + ], + "score": 0.68, + "content": "( \\pm 0 . 5 6 )", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 483, + 330, + 496 + ], + "score": 1.0, + "content": "at", + "type": "text" + }, + { + "bbox": [ + 331, + 484, + 353, + 495 + ], + "score": 0.86, + "content": "\\gamma { = } 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 483, + 390, + 496 + ], + "score": 1.0, + "content": "to 80.27", + "type": "text" + }, + { + "bbox": [ + 390, + 484, + 421, + 495 + ], + "score": 0.67, + "content": "( \\pm 0 . 3 8 )", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 483, + 432, + 496 + ], + "score": 1.0, + "content": "at", + "type": "text" + }, + { + "bbox": [ + 432, + 484, + 450, + 495 + ], + "score": 0.88, + "content": "\\gamma { = } 1", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 483, + 505, + 496 + ], + "score": 1.0, + "content": "on validation", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 495, + 223, + 507 + ], + "spans": [ + { + "bbox": [ + 141, + 495, + 223, + 507 + ], + "score": 1.0, + "content": "set for iid queries.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23 + }, + { + "type": "text", + "bbox": [ + 131, + 511, + 505, + 567 + ], + "lines": [ + { + "bbox": [ + 129, + 512, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 129, + 512, + 178, + 523 + ], + "score": 1.0, + "content": "3. Effect of", + "type": "text" + }, + { + "bbox": [ + 179, + 513, + 186, + 522 + ], + "score": 0.64, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 512, + 279, + 523 + ], + "score": 1.0, + "content": ": We generally find that", + "type": "text" + }, + { + "bbox": [ + 279, + 512, + 305, + 522 + ], + "score": 0.88, + "content": "\\alpha { = } 1 . 0", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 512, + 505, + 523 + ], + "score": 1.0, + "content": "works best for JMVAE across the different choices", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 141, + 522, + 506, + 536 + ], + "spans": [ + { + "bbox": [ + 141, + 522, + 303, + 536 + ], + "score": 1.0, + "content": "explored in Wang et al. (2016a), namely,", + "type": "text" + }, + { + "bbox": [ + 303, + 523, + 365, + 535 + ], + "score": 0.91, + "content": "\\{ 0 . 0 1 , 0 . 1 , 1 . 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 522, + 506, + 536 + ], + "score": 1.0, + "content": ". For example, decreasing the value", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 141, + 533, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 141, + 533, + 153, + 546 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 154, + 535, + 162, + 543 + ], + "score": 0.77, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 533, + 460, + 546 + ], + "score": 1.0, + "content": "to 0.1 or 0.01 reduces correctness for fully sepcified queries from 85.63", + "type": "text" + }, + { + "bbox": [ + 460, + 534, + 492, + 545 + ], + "score": 0.75, + "content": "( \\pm 0 . 2 9 )", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 533, + 505, + 546 + ], + "score": 1.0, + "content": "t o", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 141, + 545, + 506, + 557 + ], + "spans": [ + { + "bbox": [ + 141, + 545, + 169, + 557 + ], + "score": 1.0, + "content": "77.58", + "type": "text" + }, + { + "bbox": [ + 170, + 545, + 200, + 556 + ], + "score": 0.68, + "content": "( \\pm 0 . 2 3 )", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 545, + 271, + 557 + ], + "score": 1.0, + "content": "at 0.1 and 74.57", + "type": "text" + }, + { + "bbox": [ + 272, + 545, + 303, + 556 + ], + "score": 0.64, + "content": "( \\pm 0 . 4 4 )", + "type": "inline_equation" + }, + { + "bbox": [ + 303, + 545, + 506, + 557 + ], + "score": 1.0, + "content": "at 0.01 respectively on the validation set for iid", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 140, + 556, + 177, + 568 + ], + "spans": [ + { + "bbox": [ + 140, + 556, + 177, + 568 + ], + "score": 1.0, + "content": "queries.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 131, + 572, + 505, + 650 + ], + "lines": [ + { + "bbox": [ + 128, + 571, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 128, + 571, + 179, + 587 + ], + "score": 1.0, + "content": "4. Effect of", + "type": "text" + }, + { + "bbox": [ + 180, + 574, + 187, + 585 + ], + "score": 0.77, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 571, + 327, + 587 + ], + "score": 1.0, + "content": ": For BiVCCA, we ran a search for", + "type": "text" + }, + { + "bbox": [ + 327, + 574, + 335, + 585 + ], + "score": 0.8, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 571, + 356, + 587 + ], + "score": 1.0, + "content": "over", + "type": "text" + }, + { + "bbox": [ + 356, + 573, + 414, + 585 + ], + "score": 0.78, + "content": "\\{ 0 . 3 , 0 . 5 , 0 . 7 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 414, + 571, + 506, + 587 + ], + "score": 1.0, + "content": ", running each training", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 141, + 583, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 141, + 583, + 506, + 596 + ], + "score": 1.0, + "content": "experiment four times, and picked the best hyperparameter choice across the runs. We found", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 142, + 595, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 142, + 595, + 159, + 607 + ], + "score": 1.0, + "content": "that", + "type": "text" + }, + { + "bbox": [ + 160, + 595, + 185, + 606 + ], + "score": 0.88, + "content": "\\mu { = } 0 . 7", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 595, + 505, + 607 + ], + "score": 1.0, + "content": "was the best value, however the performance difference across different choices", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 141, + 605, + 505, + 619 + ], + "spans": [ + { + "bbox": [ + 141, + 605, + 340, + 619 + ], + "score": 1.0, + "content": "was not very large. Intuitively, higher values of", + "type": "text" + }, + { + "bbox": [ + 340, + 607, + 348, + 617 + ], + "score": 0.83, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 605, + 505, + 619 + ], + "score": 1.0, + "content": "should lead to improved performance", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 141, + 616, + 506, + 630 + ], + "spans": [ + { + "bbox": [ + 141, + 616, + 260, + 630 + ], + "score": 1.0, + "content": "compared to lower values of", + "type": "text" + }, + { + "bbox": [ + 260, + 618, + 267, + 628 + ], + "score": 0.78, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 616, + 401, + 630 + ], + "score": 1.0, + "content": ". This is because lower values of", + "type": "text" + }, + { + "bbox": [ + 401, + 618, + 408, + 628 + ], + "score": 0.79, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 616, + 506, + 630 + ], + "score": 1.0, + "content": "mean that we put more", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 142, + 627, + 505, + 640 + ], + "spans": [ + { + "bbox": [ + 142, + 628, + 262, + 640 + ], + "score": 1.0, + "content": "weight on the elbo term with a", + "type": "text" + }, + { + "bbox": [ + 262, + 628, + 289, + 640 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 290, + 628, + 437, + 640 + ], + "score": 1.0, + "content": "inference network than the one with a", + "type": "text" + }, + { + "bbox": [ + 438, + 627, + 465, + 640 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 465, + 628, + 505, + 640 + ], + "score": 1.0, + "content": "inference", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 142, + 639, + 313, + 651 + ], + "spans": [ + { + "bbox": [ + 142, + 639, + 313, + 651 + ], + "score": 1.0, + "content": "network, which results in sharper samples.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 35 + }, + { + "type": "title", + "bbox": [ + 107, + 666, + 503, + 677 + ], + "lines": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "score": 1.0, + "content": "A.7 COMPOSITIONAL GENRALIZATION ON MNIST-A: QUALITATIVE RESULTS AND DETAILS", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 39 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "We next show some examples of compositional generalization on MNIST-A on a validation set of", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "queries. For the compositinal experiments we reused the parameters of the best models on the iid", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 710, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 307, + 723 + ], + "score": 1.0, + "content": "splits for all the models, and trained the models for", + "type": "text" + }, + { + "bbox": [ + 308, + 710, + 343, + 720 + ], + "score": 0.88, + "content": "\\sim 1 6 0 K", + "type": "inline_equation" + }, + { + "bbox": [ + 344, + 710, + 506, + 723 + ], + "score": 1.0, + "content": "iterations. All other design choices were", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 721, + 314, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 314, + 732 + ], + "score": 1.0, + "content": "the same. Figure 12 shows some qualitative results.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 41.5 + } + ], + "page_idx": 19, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2018", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 15 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 109, + 85, + 267, + 95 + ], + "lines": [ + { + "bbox": [ + 109, + 84, + 268, + 96 + ], + "spans": [ + { + "bbox": [ + 109, + 84, + 268, + 96 + ], + "score": 1.0, + "content": "Query: 6, small, clockwise, bottom-right", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0, + "bbox_fs": [ + 109, + 84, + 268, + 96 + ] + }, + { + "type": "image", + "bbox": [ + 108, + 96, + 502, + 199 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 108, + 96, + 502, + 199 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 108, + 96, + 502, + 199 + ], + "spans": [ + { + "bbox": [ + 108, + 96, + 502, + 199 + ], + "score": 0.964, + "type": "image", + "image_path": "fefa3f8d74de211cd7f7d83aeb79bb43beef5def80d74fb90dfdbd1002ae226b.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 108, + 96, + 502, + 130.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 108, + 130.33333333333334, + 502, + 164.66666666666669 + ], + "spans": [], + "index": 2 + }, + { + "bbox": [ + 108, + 164.66666666666669, + 502, + 199.00000000000003 + ], + "spans": [], + "index": 3 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 107, + 227, + 505, + 278 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 227, + 505, + 239 + ], + "spans": [ + { + "bbox": [ + 106, + 227, + 505, + 239 + ], + "score": 1.0, + "content": "Figure 12: Compositional generalization on MNIST-A. Models are given the unseen compositional query shown", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 237, + 506, + 249 + ], + "spans": [ + { + "bbox": [ + 106, + 237, + 506, + 249 + ], + "score": 1.0, + "content": "at the top and each of the three columns shows the mean of the image distribution generated by the models.", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 248, + 506, + 259 + ], + "spans": [ + { + "bbox": [ + 106, + 248, + 506, + 259 + ], + "score": 1.0, + "content": "Images marked with a red box are those that the observation classifier detected as being incorrect. We also show", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 258, + 505, + 269 + ], + "spans": [ + { + "bbox": [ + 106, + 258, + 505, + 269 + ], + "score": 1.0, + "content": "the classification result from the observation classifier on top of each image. We see that TELBO and JMVAE", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 267, + 320, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 267, + 320, + 279 + ], + "score": 1.0, + "content": "both do really well, while BiVCCA is substantially poorer.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 6 + } + ], + "index": 4.0 + }, + { + "type": "text", + "bbox": [ + 131, + 302, + 505, + 423 + ], + "lines": [ + { + "bbox": [ + 129, + 300, + 506, + 315 + ], + "spans": [ + { + "bbox": [ + 129, + 300, + 180, + 315 + ], + "score": 1.0, + "content": "1. Effect of", + "type": "text" + }, + { + "bbox": [ + 181, + 302, + 192, + 314 + ], + "score": 0.87, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 300, + 255, + 315 + ], + "score": 1.0, + "content": ": We search for", + "type": "text" + }, + { + "bbox": [ + 255, + 302, + 267, + 314 + ], + "score": 0.9, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 300, + 336, + 315 + ], + "score": 1.0, + "content": "values in the set", + "type": "text" + }, + { + "bbox": [ + 336, + 302, + 386, + 314 + ], + "score": 0.92, + "content": "\\{ 1 , 5 0 , 1 0 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 300, + 506, + 315 + ], + "score": 1.0, + "content": "for all objectives. In general,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 141, + 313, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 141, + 313, + 227, + 326 + ], + "score": 1.0, + "content": "we find the setting of", + "type": "text" + }, + { + "bbox": [ + 227, + 313, + 239, + 325 + ], + "score": 0.88, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 313, + 506, + 326 + ], + "score": 1.0, + "content": "in the elbo terms to be critical for good performance (especially on", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 141, + 323, + 506, + 338 + ], + "spans": [ + { + "bbox": [ + 141, + 323, + 257, + 338 + ], + "score": 1.0, + "content": "correctness). For example, at", + "type": "text" + }, + { + "bbox": [ + 258, + 324, + 279, + 335 + ], + "score": 0.9, + "content": "\\lambda _ { y } { = } 1", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 323, + 506, + 338 + ], + "score": 1.0, + "content": ", we find that correctness numbers for the best performing", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 142, + 335, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 142, + 335, + 260, + 347 + ], + "score": 1.0, + "content": "TELBO model drop to 60.47", + "type": "text" + }, + { + "bbox": [ + 260, + 336, + 294, + 346 + ], + "score": 0.48, + "content": "( \\pm 0 . 3 4 )", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 335, + 345, + 347 + ], + "score": 1.0, + "content": "(from 82.08", + "type": "text" + }, + { + "bbox": [ + 345, + 335, + 380, + 346 + ], + "score": 0.58, + "content": "( \\pm 0 . 5 6 )", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 335, + 391, + 347 + ], + "score": 1.0, + "content": "at", + "type": "text" + }, + { + "bbox": [ + 391, + 335, + 419, + 347 + ], + "score": 0.9, + "content": "\\lambda _ { y } = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 335, + 505, + 347 + ], + "score": 1.0, + "content": ") on the validation set", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 140, + 345, + 506, + 359 + ], + "spans": [ + { + "bbox": [ + 140, + 345, + 506, + 359 + ], + "score": 1.0, + "content": "for iid queries. Similar trends can be observed for the JMVAE and BiVCCA objectives as", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 141, + 357, + 506, + 371 + ], + "spans": [ + { + "bbox": [ + 141, + 357, + 186, + 371 + ], + "score": 1.0, + "content": "well (with", + "type": "text" + }, + { + "bbox": [ + 186, + 357, + 214, + 369 + ], + "score": 0.91, + "content": "\\lambda _ { y } = 1 0", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 357, + 362, + 371 + ], + "score": 1.0, + "content": "being the best setting for BiVCCA,", + "type": "text" + }, + { + "bbox": [ + 362, + 357, + 390, + 369 + ], + "score": 0.9, + "content": "\\lambda _ { y } = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 390, + 357, + 506, + 371 + ], + "score": 1.0, + "content": "for JMVAE). We have seen", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 141, + 367, + 506, + 381 + ], + "spans": [ + { + "bbox": [ + 141, + 367, + 393, + 381 + ], + "score": 1.0, + "content": "qualitative evidence which shows that the likelihood scaling for", + "type": "text" + }, + { + "bbox": [ + 393, + 368, + 405, + 380 + ], + "score": 0.89, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 367, + 506, + 381 + ], + "score": 1.0, + "content": "affects how disentangled", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 141, + 379, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 141, + 379, + 505, + 391 + ], + "score": 1.0, + "content": "the latent space is along the specified attributes. When the latent space is not grouped or", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 140, + 389, + 506, + 403 + ], + "spans": [ + { + "bbox": [ + 140, + 389, + 506, + 403 + ], + "score": 1.0, + "content": "organized as per high-level attributes (see Figure 8 for example), the posterior distribution", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 142, + 400, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 142, + 401, + 466, + 413 + ], + "score": 1.0, + "content": "for a given concept is multimodal, which is hard for a gaussian inference network", + "type": "text" + }, + { + "bbox": [ + 466, + 400, + 493, + 412 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 401, + 505, + 413 + ], + "score": 1.0, + "content": "to", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 142, + 412, + 329, + 424 + ], + "spans": [ + { + "bbox": [ + 142, + 412, + 329, + 424 + ], + "score": 1.0, + "content": "capture. This leads to poor correctness values.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 14, + "bbox_fs": [ + 129, + 300, + 506, + 424 + ] + }, + { + "type": "text", + "bbox": [ + 131, + 429, + 505, + 506 + ], + "lines": [ + { + "bbox": [ + 128, + 428, + 507, + 442 + ], + "spans": [ + { + "bbox": [ + 128, + 428, + 182, + 442 + ], + "score": 1.0, + "content": "2. Effect of", + "type": "text" + }, + { + "bbox": [ + 182, + 431, + 190, + 441 + ], + "score": 0.78, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 428, + 271, + 442 + ], + "score": 1.0, + "content": ": In addition to the", + "type": "text" + }, + { + "bbox": [ + 272, + 429, + 284, + 441 + ], + "score": 0.89, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 428, + 507, + 442 + ], + "score": 1.0, + "content": "scaling term which is common across all objectives,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 142, + 439, + 505, + 452 + ], + "spans": [ + { + "bbox": [ + 142, + 439, + 203, + 452 + ], + "score": 1.0, + "content": "TELBO has a", + "type": "text" + }, + { + "bbox": [ + 203, + 442, + 211, + 451 + ], + "score": 0.78, + "content": "\\gamma", + "type": "inline_equation" + }, + { + "bbox": [ + 211, + 439, + 412, + 452 + ], + "score": 1.0, + "content": "scaling factor which controls how we scale the", + "type": "text" + }, + { + "bbox": [ + 412, + 439, + 454, + 452 + ], + "score": 0.93, + "content": "\\log p ( y | z )", + "type": "inline_equation" + }, + { + "bbox": [ + 455, + 439, + 505, + 452 + ], + "score": 1.0, + "content": "term in the", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 142, + 450, + 506, + 464 + ], + "spans": [ + { + "bbox": [ + 142, + 451, + 218, + 464 + ], + "score": 0.91, + "content": "\\mathrm { e l b o } _ { \\gamma , 1 } ( \\mathbf { y } , \\pmb { \\theta } _ { y } , \\phi _ { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 450, + 330, + 464 + ], + "score": 1.0, + "content": "term. We sweep values of", + "type": "text" + }, + { + "bbox": [ + 330, + 451, + 379, + 463 + ], + "score": 0.92, + "content": "\\{ 1 , 5 0 , 1 0 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 450, + 506, + 464 + ], + "score": 1.0, + "content": "for this parameter. In general,", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 141, + 462, + 506, + 474 + ], + "spans": [ + { + "bbox": [ + 141, + 462, + 440, + 474 + ], + "score": 1.0, + "content": "we find that the effect of this term is smaller on the performance than the", + "type": "text" + }, + { + "bbox": [ + 440, + 462, + 452, + 474 + ], + "score": 0.89, + "content": "\\lambda _ { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 462, + 506, + 474 + ], + "score": 1.0, + "content": "term. Based", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 142, + 473, + 505, + 485 + ], + "spans": [ + { + "bbox": [ + 142, + 473, + 505, + 485 + ], + "score": 1.0, + "content": "on the setting of this parameter, we find that, for example, the correctness values for fully", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 483, + 505, + 496 + ], + "spans": [ + { + "bbox": [ + 141, + 483, + 289, + 496 + ], + "score": 1.0, + "content": "specified queries change from 82.08", + "type": "text" + }, + { + "bbox": [ + 289, + 484, + 320, + 495 + ], + "score": 0.68, + "content": "( \\pm 0 . 5 6 )", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 483, + 330, + 496 + ], + "score": 1.0, + "content": "at", + "type": "text" + }, + { + "bbox": [ + 331, + 484, + 353, + 495 + ], + "score": 0.86, + "content": "\\gamma { = } 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 483, + 390, + 496 + ], + "score": 1.0, + "content": "to 80.27", + "type": "text" + }, + { + "bbox": [ + 390, + 484, + 421, + 495 + ], + "score": 0.67, + "content": "( \\pm 0 . 3 8 )", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 483, + 432, + 496 + ], + "score": 1.0, + "content": "at", + "type": "text" + }, + { + "bbox": [ + 432, + 484, + 450, + 495 + ], + "score": 0.88, + "content": "\\gamma { = } 1", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 483, + 505, + 496 + ], + "score": 1.0, + "content": "on validation", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 495, + 223, + 507 + ], + "spans": [ + { + "bbox": [ + 141, + 495, + 223, + 507 + ], + "score": 1.0, + "content": "set for iid queries.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23, + "bbox_fs": [ + 128, + 428, + 507, + 507 + ] + }, + { + "type": "text", + "bbox": [ + 131, + 511, + 505, + 567 + ], + "lines": [ + { + "bbox": [ + 129, + 512, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 129, + 512, + 178, + 523 + ], + "score": 1.0, + "content": "3. Effect of", + "type": "text" + }, + { + "bbox": [ + 179, + 513, + 186, + 522 + ], + "score": 0.64, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 512, + 279, + 523 + ], + "score": 1.0, + "content": ": We generally find that", + "type": "text" + }, + { + "bbox": [ + 279, + 512, + 305, + 522 + ], + "score": 0.88, + "content": "\\alpha { = } 1 . 0", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 512, + 505, + 523 + ], + "score": 1.0, + "content": "works best for JMVAE across the different choices", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 141, + 522, + 506, + 536 + ], + "spans": [ + { + "bbox": [ + 141, + 522, + 303, + 536 + ], + "score": 1.0, + "content": "explored in Wang et al. (2016a), namely,", + "type": "text" + }, + { + "bbox": [ + 303, + 523, + 365, + 535 + ], + "score": 0.91, + "content": "\\{ 0 . 0 1 , 0 . 1 , 1 . 0 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 522, + 506, + 536 + ], + "score": 1.0, + "content": ". For example, decreasing the value", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 141, + 533, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 141, + 533, + 153, + 546 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 154, + 535, + 162, + 543 + ], + "score": 0.77, + "content": "\\alpha", + "type": "inline_equation" + }, + { + "bbox": [ + 162, + 533, + 460, + 546 + ], + "score": 1.0, + "content": "to 0.1 or 0.01 reduces correctness for fully sepcified queries from 85.63", + "type": "text" + }, + { + "bbox": [ + 460, + 534, + 492, + 545 + ], + "score": 0.75, + "content": "( \\pm 0 . 2 9 )", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 533, + 505, + 546 + ], + "score": 1.0, + "content": "t o", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 141, + 545, + 506, + 557 + ], + "spans": [ + { + "bbox": [ + 141, + 545, + 169, + 557 + ], + "score": 1.0, + "content": "77.58", + "type": "text" + }, + { + "bbox": [ + 170, + 545, + 200, + 556 + ], + "score": 0.68, + "content": "( \\pm 0 . 2 3 )", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 545, + 271, + 557 + ], + "score": 1.0, + "content": "at 0.1 and 74.57", + "type": "text" + }, + { + "bbox": [ + 272, + 545, + 303, + 556 + ], + "score": 0.64, + "content": "( \\pm 0 . 4 4 )", + "type": "inline_equation" + }, + { + "bbox": [ + 303, + 545, + 506, + 557 + ], + "score": 1.0, + "content": "at 0.01 respectively on the validation set for iid", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 140, + 556, + 177, + 568 + ], + "spans": [ + { + "bbox": [ + 140, + 556, + 177, + 568 + ], + "score": 1.0, + "content": "queries.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 29, + "bbox_fs": [ + 129, + 512, + 506, + 568 + ] + }, + { + "type": "text", + "bbox": [ + 131, + 572, + 505, + 650 + ], + "lines": [ + { + "bbox": [ + 128, + 571, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 128, + 571, + 179, + 587 + ], + "score": 1.0, + "content": "4. Effect of", + "type": "text" + }, + { + "bbox": [ + 180, + 574, + 187, + 585 + ], + "score": 0.77, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 571, + 327, + 587 + ], + "score": 1.0, + "content": ": For BiVCCA, we ran a search for", + "type": "text" + }, + { + "bbox": [ + 327, + 574, + 335, + 585 + ], + "score": 0.8, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 335, + 571, + 356, + 587 + ], + "score": 1.0, + "content": "over", + "type": "text" + }, + { + "bbox": [ + 356, + 573, + 414, + 585 + ], + "score": 0.78, + "content": "\\{ 0 . 3 , 0 . 5 , 0 . 7 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 414, + 571, + 506, + 587 + ], + "score": 1.0, + "content": ", running each training", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 141, + 583, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 141, + 583, + 506, + 596 + ], + "score": 1.0, + "content": "experiment four times, and picked the best hyperparameter choice across the runs. We found", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 142, + 595, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 142, + 595, + 159, + 607 + ], + "score": 1.0, + "content": "that", + "type": "text" + }, + { + "bbox": [ + 160, + 595, + 185, + 606 + ], + "score": 0.88, + "content": "\\mu { = } 0 . 7", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 595, + 505, + 607 + ], + "score": 1.0, + "content": "was the best value, however the performance difference across different choices", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 141, + 605, + 505, + 619 + ], + "spans": [ + { + "bbox": [ + 141, + 605, + 340, + 619 + ], + "score": 1.0, + "content": "was not very large. Intuitively, higher values of", + "type": "text" + }, + { + "bbox": [ + 340, + 607, + 348, + 617 + ], + "score": 0.83, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 605, + 505, + 619 + ], + "score": 1.0, + "content": "should lead to improved performance", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 141, + 616, + 506, + 630 + ], + "spans": [ + { + "bbox": [ + 141, + 616, + 260, + 630 + ], + "score": 1.0, + "content": "compared to lower values of", + "type": "text" + }, + { + "bbox": [ + 260, + 618, + 267, + 628 + ], + "score": 0.78, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 616, + 401, + 630 + ], + "score": 1.0, + "content": ". This is because lower values of", + "type": "text" + }, + { + "bbox": [ + 401, + 618, + 408, + 628 + ], + "score": 0.79, + "content": "\\mu", + "type": "inline_equation" + }, + { + "bbox": [ + 409, + 616, + 506, + 630 + ], + "score": 1.0, + "content": "mean that we put more", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 142, + 627, + 505, + 640 + ], + "spans": [ + { + "bbox": [ + 142, + 628, + 262, + 640 + ], + "score": 1.0, + "content": "weight on the elbo term with a", + "type": "text" + }, + { + "bbox": [ + 262, + 628, + 289, + 640 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 290, + 628, + 437, + 640 + ], + "score": 1.0, + "content": "inference network than the one with a", + "type": "text" + }, + { + "bbox": [ + 438, + 627, + 465, + 640 + ], + "score": 0.92, + "content": "q ( \\mathbf { z } | \\mathbf { y } )", + "type": "inline_equation" + }, + { + "bbox": [ + 465, + 628, + 505, + 640 + ], + "score": 1.0, + "content": "inference", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 142, + 639, + 313, + 651 + ], + "spans": [ + { + "bbox": [ + 142, + 639, + 313, + 651 + ], + "score": 1.0, + "content": "network, which results in sharper samples.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 35, + "bbox_fs": [ + 128, + 571, + 506, + 651 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 666, + 503, + 677 + ], + "lines": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "score": 1.0, + "content": "A.7 COMPOSITIONAL GENRALIZATION ON MNIST-A: QUALITATIVE RESULTS AND DETAILS", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 39 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "We next show some examples of compositional generalization on MNIST-A on a validation set of", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "queries. 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At the top we show the set of attributes which", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 104, + 339, + 506, + 352 + ], + "spans": [ + { + "bbox": [ + 104, + 339, + 506, + 352 + ], + "score": 1.0, + "content": "are present and absent in the input query. Below, we show the results of generation with all the attributes", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "score": 1.0, + "content": "specified, drawing 10 samples each. We see that both TELBO and JMVAE create accurate images satisfying the", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 360, + 506, + 372 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 506, + 372 + ], + "score": 1.0, + "content": "constraints. Note that the concept “male” is set to “absent” in the query, which in CelebA means that “female” is", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 369, + 507, + 383 + ], + "spans": [ + { + "bbox": [ + 104, + 369, + 507, + 383 + ], + "score": 1.0, + "content": "present. Next, we unspecify whether the image should contain a male or a female. We see that in this setting,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 380, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 106, + 380, + 505, + 391 + ], + "score": 1.0, + "content": "TELBO has a better mixing of male and female images (fourth, sixth, eighth and ninth images in the third row", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 390, + 469, + 401 + ], + "spans": [ + { + "bbox": [ + 106, + 390, + 469, + 401 + ], + "score": 1.0, + "content": "are male), than JMVAE which just produces a single male image (the ninth image in the fourth row).", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 17 + } + ], + "index": 13.0 + }, + { + "type": "title", + "bbox": [ + 108, + 427, + 225, + 438 + ], + "lines": [ + { + "bbox": [ + 106, + 426, + 226, + 440 + ], + "spans": [ + { + "bbox": [ + 106, + 426, + 226, + 440 + ], + "score": 1.0, + "content": "A.8 DETAILS ON CELEBA", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 107, + 450, + 505, + 528 + ], + "lines": [ + { + "bbox": [ + 106, + 450, + 505, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 505, + 462 + ], + "score": 1.0, + "content": "CelebA consists of 202,599 face colored images and 40 attribute binary vectors. We use the version", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "score": 1.0, + "content": "of this dataset that was used in (Perarnau et al., 2016); this uses a subset of 18 visually distinctive", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 472, + 505, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 455, + 484 + ], + "score": 1.0, + "content": "attributes, and preprocesses each image so they are aligned, cropped, and scaled down to", + "type": "text" + }, + { + "bbox": [ + 455, + 473, + 486, + 483 + ], + "score": 0.8, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 472, + 505, + 484 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 483, + 505, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 505, + 496 + ], + "score": 1.0, + "content": "use the official train and test partitions, 182K for training and 20K for testing. Note that this is an", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 493, + 505, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 493, + 505, + 507 + ], + "score": 1.0, + "content": "iid split, so the attribute vectors in the test set all occur in the training set, even though the images", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 505, + 505, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 505, + 518 + ], + "score": 1.0, + "content": "and people are unique. In total, the original dataset with 40 attributes specified a set of 96486 unique", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 515, + 455, + 529 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 455, + 529 + ], + "score": 1.0, + "content": "visual concepts, while our dataset of 18 attributes spans 3690 different visual concepts.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 107, + 533, + 505, + 588 + ], + "lines": [ + { + "bbox": [ + 105, + 532, + 506, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 506, + 546 + ], + "score": 1.0, + "content": "In Section 5.2, we claim that our generations of “Bald” and “Female” images are from a composi-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 544, + 505, + 556 + ], + "spans": [ + { + "bbox": [ + 106, + 544, + 449, + 556 + ], + "score": 1.0, + "content": "tionally novel concept. 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At the top we show the set of attributes which", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 104, + 339, + 506, + 352 + ], + "spans": [ + { + "bbox": [ + 104, + 339, + 506, + 352 + ], + "score": 1.0, + "content": "are present and absent in the input query. Below, we show the results of generation with all the attributes", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "score": 1.0, + "content": "specified, drawing 10 samples each. We see that both TELBO and JMVAE create accurate images satisfying the", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 360, + 506, + 372 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 506, + 372 + ], + "score": 1.0, + "content": "constraints. Note that the concept “male” is set to “absent” in the query, which in CelebA means that “female” is", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 369, + 507, + 383 + ], + "spans": [ + { + "bbox": [ + 104, + 369, + 507, + 383 + ], + "score": 1.0, + "content": "present. Next, we unspecify whether the image should contain a male or a female. We see that in this setting,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 380, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 106, + 380, + 505, + 391 + ], + "score": 1.0, + "content": "TELBO has a better mixing of male and female images (fourth, sixth, eighth and ninth images in the third row", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 390, + 469, + 401 + ], + "spans": [ + { + "bbox": [ + 106, + 390, + 469, + 401 + ], + "score": 1.0, + "content": "are male), than JMVAE which just produces a single male image (the ninth image in the fourth row).", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 17 + } + ], + "index": 13.0 + }, + { + "type": "title", + "bbox": [ + 108, + 427, + 225, + 438 + ], + "lines": [ + { + "bbox": [ + 106, + 426, + 226, + 440 + ], + "spans": [ + { + "bbox": [ + 106, + 426, + 226, + 440 + ], + "score": 1.0, + "content": "A.8 DETAILS ON CELEBA", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 107, + 450, + 505, + 528 + ], + "lines": [ + { + "bbox": [ + 106, + 450, + 505, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 505, + 462 + ], + "score": 1.0, + "content": "CelebA consists of 202,599 face colored images and 40 attribute binary vectors. We use the version", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 460, + 505, + 473 + ], + "score": 1.0, + "content": "of this dataset that was used in (Perarnau et al., 2016); this uses a subset of 18 visually distinctive", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 472, + 505, + 484 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 455, + 484 + ], + "score": 1.0, + "content": "attributes, and preprocesses each image so they are aligned, cropped, and scaled down to", + "type": "text" + }, + { + "bbox": [ + 455, + 473, + 486, + 483 + ], + "score": 0.8, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 472, + 505, + 484 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 483, + 505, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 483, + 505, + 496 + ], + "score": 1.0, + "content": "use the official train and test partitions, 182K for training and 20K for testing. Note that this is an", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 493, + 505, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 493, + 505, + 507 + ], + "score": 1.0, + "content": "iid split, so the attribute vectors in the test set all occur in the training set, even though the images", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 505, + 505, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 505, + 518 + ], + "score": 1.0, + "content": "and people are unique. In total, the original dataset with 40 attributes specified a set of 96486 unique", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 515, + 455, + 529 + ], + "spans": [ + { + "bbox": [ + 105, + 515, + 455, + 529 + ], + "score": 1.0, + "content": "visual concepts, while our dataset of 18 attributes spans 3690 different visual concepts.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 25, + "bbox_fs": [ + 105, + 450, + 505, + 529 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 533, + 505, + 588 + ], + "lines": [ + { + "bbox": [ + 105, + 532, + 506, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 506, + 546 + ], + "score": 1.0, + "content": "In Section 5.2, we claim that our generations of “Bald” and “Female” images are from a composi-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 544, + 505, + 556 + ], + "spans": [ + { + "bbox": [ + 106, + 544, + 449, + 556 + ], + "score": 1.0, + "content": "tionally novel concept. Our claim comes with a minor caveat/clarification: the concept", + "type": "text" + }, + { + "bbox": [ + 449, + 545, + 487, + 555 + ], + "score": 0.4, + "content": "\\mathtt { b a l d } { = } 1", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 544, + 505, + 556 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 554, + 505, + 568 + ], + "spans": [ + { + "bbox": [ + 106, + 556, + 144, + 566 + ], + "score": 0.78, + "content": "\\mathtt { m a l e = 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 145, + 554, + 505, + 568 + ], + "score": 1.0, + "content": "does occur in 9 training examples, but they are all incorrect labelings, as shown in Figure 13!", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 564, + 505, + 580 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 505, + 580 + ], + "score": 1.0, + "content": "Further, we see that the images generated from our model (shown in Figure 5) are qualitatively very", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 576, + 499, + 590 + ], + "spans": [ + { + "bbox": [ + 106, + 576, + 499, + 590 + ], + "score": 1.0, + "content": "different from any of the images here, showing that the model has not memorized these examples.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31, + "bbox_fs": [ + 105, + 532, + 506, + 590 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 608, + 254, + 619 + ], + "lines": [ + { + "bbox": [ + 106, + 607, + 255, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 607, + 255, + 620 + ], + "score": 1.0, + "content": "A.9 MORE RESULTS ON CELEBA", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 106, + 631, + 505, + 733 + ], + "lines": [ + { + "bbox": [ + 105, + 630, + 505, + 644 + ], + "spans": [ + { + "bbox": [ + 105, + 630, + 505, + 644 + ], + "score": 1.0, + "content": "Finally, we show further qualitative examples of performance on the CelebA dataset. We focus", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 641, + 505, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 641, + 505, + 654 + ], + "score": 1.0, + "content": "on the TELBO and JMVAE objectives here, since BiVCCA generally produces poor samples", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 653, + 505, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 653, + 505, + 665 + ], + "score": 1.0, + "content": "(see Figure 5). Figure 14 (middle) shows some example generations for the concept specified by the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 664, + 505, + 676 + ], + "spans": [ + { + "bbox": [ + 106, + 664, + 505, + 676 + ], + "score": 1.0, + "content": "attributes (top). We see that both TELBO and JMVAE produce correct images when provided the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 673, + 506, + 687 + ], + "spans": [ + { + "bbox": [ + 105, + 673, + 506, + 687 + ], + "score": 1.0, + "content": "full attribute queries (first two rows). However, when we stop specifying attribute “male” or “not", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 686, + 505, + 698 + ], + "spans": [ + { + "bbox": [ + 106, + 686, + 505, + 698 + ], + "score": 1.0, + "content": "male” (female), we see that TELBO provides more diverse samples, spanning both male and female", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 696, + 506, + 709 + ], + "spans": [ + { + "bbox": [ + 105, + 696, + 506, + 709 + ], + "score": 1.0, + "content": "(compared to JMVAE). This ties into the explanation in Appendix A.1, where we show how one", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 101, + 704, + 508, + 723 + ], + "spans": [ + { + "bbox": [ + 101, + 704, + 279, + 723 + ], + "score": 1.0, + "content": "can interpret JMVAE as optimizing for the", + "type": "text" + }, + { + "bbox": [ + 280, + 707, + 387, + 722 + ], + "score": 0.94, + "content": "\\bar { \\mathrm { K L } } ( q _ { \\phi } ^ { \\mathrm { a v g } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) | \\bar { q } _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } ) )", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 704, + 508, + 723 + ], + "score": 1.0, + "content": "to fit the unimodal inference", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 720, + 505, + 735 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 142, + 734 + ], + "score": 1.0, + "content": "network", + "type": "text" + }, + { + "bbox": [ + 142, + 720, + 183, + 735 + ], + "score": 0.93, + "content": "q _ { \\phi _ { y } } ( \\mathbf { z } | \\mathbf { y } _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 720, + 505, + 734 + ], + "score": 1.0, + "content": ". 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Method#AttributesCoverage (%)Correctness (%)
iid split
TELBO482.08±0.56
JMVAE85.15 ±0.26
BiVCCA67.38 ±0.69
TELBO391.14 ± 0.5381.63 ± 0.38
JMVAE88.52 ± 0.3782.00 ±0.37
BiVCCA85.28 ±0.6870.68 ± 0.87
TELBO290.32 ± 0.5782.03 ± 1.37
JMVAE87.89 ±0.6981.02 ± 1.05
BiVCCA85.09 ±0.7672.33 ± 2.31
TELBO190.94 ±0.1983.67 ± 1.70
JMVAE88.70 ±0.3581.58 ± 1.78
BiVCCA85.53 ± 0.2768.36 ± 2.21
Compositional split
TELBO475.61 ± 1.43
JMVAE76.86 ± 1.30
BiVCCA68.58 ± 1.02
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ApproachConcept-Latent (%)Concept-NB (%)
TELBO35.66 ± 2.0517.66 ± 1.70
JMVAE54.66 ± 4.9213.33 ± 2.05
BiVCCA28.00 ± 4.5418.00 ± 1.40
Random0.28±0.000.28±0.00
Most Frequent6.33 ± 1.886.33 ± 1.88
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FLOW + +Xue Bin Peng & Angjoo Kanazawa & Sam Toyer & Pieter Abbeel & Sergey Levine + +University of California, Berkeley {xbpeng,kanazawa,sdt,pabbeel,svlevine}@berkeley.edu + +# ABSTRACT + +Adversarial learning methods have been proposed for a wide range of applications, but the training of adversarial models can be notoriously unstable. Effectively balancing the performance of the generator and discriminator is critical, since a discriminator that achieves very high accuracy will produce relatively uninformative gradients. In this work, we propose a simple and general technique to constrain information flow in the discriminator by means of an information bottleneck. By enforcing a constraint on the mutual information between the observations and the discriminator’s internal representation, we can effectively modulate the discriminator’s accuracy and maintain useful and informative gradients. We demonstrate that our proposed variational discriminator bottleneck (VDB) leads to significant improvements across three distinct application areas for adversarial learning algorithms. Our primary evaluation studies the applicability of the VDB to imitation learning of dynamic continuous control skills, such as running. We show that our method can learn such skills directly from raw video demonstrations, substantially outperforming prior adversarial imitation learning methods. The VDB can also be combined with adversarial inverse reinforcement learning to learn parsimonious reward functions that can be transferred and re-optimized in new settings. Finally, we demonstrate that VDB can train GANs more effectively for image generation, improving upon a number of prior stabilization methods. (Video1) + +# 1 INTRODUCTION + +Adversarial learning methods provide a promising approach to modeling distributions over highdimensional data with complex internal correlation structures. These methods generally use a discriminator to supervise the training of a generator in order to produce samples that are indistinguishable from the data. A particular instantiation is generative adversarial networks, which can be used for high-fidelity generation of images (Goodfellow et al., 2014; Karras et al., 2017) and other highdimensional data (Vondrick et al., 2016; Xie et al., 2018; Donahue et al., 2018). Adversarial methods can also be used to learn reward functions in the framework of inverse reinforcement learning (Finn et al., 2016a; Fu et al., 2017), or to directly imitate demonstrations (Ho & Ermon, 2016). However, they suffer from major optimization challenges, one of which is balancing the performance of the generator and discriminator. A discriminator that achieves very high accuracy can produce relatively uninformative gradients, but a weak discriminator can also hamper the generator’s ability to learn. These challenges have led to widespread interest in a variety of stabilization methods for adversarial learning algorithms (Arjovsky et al., 2017; Kodali et al., 2017; Berthelot et al., 2017). + +In this work, we propose a simple regularization technique for adversarial learning, which constrains the information flow from the inputs to the discriminator using a variational approximation to the information bottleneck. By enforcing a constraint on the mutual information between the input observations and the discriminator’s internal representation, we can encourage the discriminator to learn a representation that has heavy overlap between the data and the generator’s distribution, thereby effectively modulating the discriminator’s accuracy and maintaining useful and informative gradients for the generator. Our approach to stabilizing adversarial learning can be viewed as an adaptive variant of instance noise (Salimans et al., 2016; Sønderby et al., 2016; Arjovsky & Bottou, 2017). However, we show that the adaptive nature of this method is critical. Constraining the mutual information between the discriminator’s internal representation and the input allows the regularizer to directly limit the discriminator’s accuracy, which automates the choice of noise magnitude and applies this noise to a compressed representation of the input that is specifically optimized to model the most discerning differences between the generator and data distributions. + +![](images/79dae658a21f3a99bd5d512bd39e4ed96a241605dc27ac431de015f01936586c.jpg) +Figure 1: Our method is general and can be applied to a broad range of adversarial learning tasks. Left: Motion imitation with adversarial imitation learning. Middle: Image generation. Right: Learning transferable reward functions through adversarial inverse reinforcement learning. + +The main contribution of this work is the variational discriminator bottleneck (VDB), an adaptive stochastic regularization method for adversarial learning that substantially improves performance across a range of different application domains, examples of which are available in Figure 1. Our method can be easily applied to a variety of tasks and architectures. First, we evaluate our method on a suite of challenging imitation tasks, including learning highly acrobatic skills from mocap data with a simulated humanoid character. Our method also enables characters to learn dynamic continuous control skills directly from raw video demonstrations, and drastically improves upon previous work that uses adversarial imitation learning. We further evaluate the effectiveness of the technique for inverse reinforcement learning, which recovers a reward function from demonstrations in order to train future policies. Finally, we apply our framework to image generation using generative adversarial networks, where employing VDB improves the performance in many cases. + +# 2 RELATED WORK + +Recent years have seen an explosion of adversarial learning techniques, spurred by the success of generative adversarial networks (GANs) (Goodfellow et al., 2014). A GAN framework is commonly composed of a discriminator and a generator, where the discriminator’s objective is to classify samples as real or fake, while the generator’s objective is to produce samples that fool the discriminator. Similar frameworks have also been proposed for inverse reinforcement learning (IRL) (Finn et al., 2016b) and imitation learning (Ho & Ermon, 2016). The training of adversarial models can be extremely unstable, with one of the most prevalent challenges being balancing the interplay between the discriminator and the generator (Berthelot et al., 2017). The discriminator can often overpower the generator, easily differentiating between real and fake samples, thus providing the generator with uninformative gradients for improvement (Che et al., 2016). Alternative loss functions have been proposed to mitigate this problem (Mao et al., 2016; Zhao et al., 2016; Arjovsky et al., 2017). Regularizers have been incorporated to improve stability and convergence, such as gradient penalties (Kodali et al., 2017; Gulrajani et al., 2017a; Mescheder et al., 2018), reconstruction loss (Che et al., 2016), and a myriad of other heuristics (Sønderby et al., 2016; Salimans et al., 2016; Arjovsky & Bottou, 2017; Berthelot et al., 2017). Task-specific architectural designs can also substantially improve performance (Radford et al., 2015; Karras et al., 2017). Similarly, our method also aims to regularize the discriminator in order to improve the feedback provided to the generator. But instead of explicit regularization of gradients or architecture-specific constraints, we apply a general information bottleneck to the discriminator, which previous works have shown to encourage networks to ignore irrelevant cues (Achille & Soatto, 2017). We hypothesize that this then allows the generator to focus on improving the most discerning differences between real and fake samples. + +Adversarial techniques have also been applied to inverse reinforcement learning (Fu et al., 2017), where a reward function is recovered from demonstrations, which can then be used to train policies to reproduce a desired skill. Finn et al. (2016a) showed an equivalence between maximum entropy IRL and GANs. Similar techniques have been developed for adversarial imitation learning (Ho & Ermon, 2016; Merel et al., 2017), where agents learn to imitate demonstrations without explicitly recovering a reward function. One advantage of adversarial methods is that by leveraging a discriminator in place of a reward function, they can be applied to imitate skills where reward functions can be difficult to engineer. However, the performance of policies trained through adversarial methods still falls short of those produced by manually designed reward functions, when such reward functions are available (Rajeswaran et al., 2017; Peng et al., 2018). We show that our method can significantly improve upon previous works that use adversarial techniques, and produces results of comparable quality to those from state-of-the-art approaches that utilize manually engineered reward functions. + +Our variational discriminator bottleneck is based on the information bottleneck (Tishby & Zaslavsky, 2015), a technique for regularizing internal representations to minimize the mutual information with the input. Intuitively, a compressed representation can improve generalization by ignoring irrelevant distractors present in the original input. The information bottleneck can be instantiated in practical deep models by leveraging a variational bound and the reparameterization trick, inspired by a similar approach in variational autoencoders (VAE) (Kingma & Welling, 2013). The resulting variational information bottleneck approximates this compression effect in deep networks (Alemi et al., 2016; Achille & Soatto, 2017). A similar bottleneck has also been applied to learn disentangled representations (Higgins et al., 2017). Building on the success of VAEs and GANs, a number of efforts have been made to combine the two. Makhzani et al. (2016) used adversarial discriminators during the training of VAEs to encourage the marginal distribution of the latent encoding to be similar to the prior distribution, similar techniques include Mescheder et al. (2017) and Chen et al. (2018). Conversely, Larsen et al. (2016) modeled the generator of a GAN using a VAE. Zhao et al. (2016) used an autoencoder instead of a VAE to model the discriminator, but does not enforce an information bottleneck on the encoding. While instance noise is widely used in modern architectures (Salimans et al., 2016; Sønderby et al., 2016; Arjovsky & Bottou, 2017), we show that explicitly enforcing an information bottleneck leads to improved performance over simply adding noise for a variety of applications. + +# 3 PRELIMINARIES + +In this section, we provide a review of the variational information bottleneck proposed by Alemi et al. (2016) in the context of supervised learning. Our variational discriminator bottleneck is based on the same principle, and can be instantiated in the context of GANs, inverse RL, and imitation learning. Given a dataset $\left\{ \mathbf { x } _ { i } , \mathbf { y } _ { i } \right\}$ , with features $\mathbf { x } _ { i }$ and labels $\mathbf { y } _ { i }$ , the standard maximum likelihood estimate $q ( \mathbf { y } _ { i } | \mathbf { x } _ { i } )$ can be determined according to + +$$ +\operatorname* { m i n } _ { \boldsymbol { q } } \quad \mathbb { E } _ { \mathbf { x } , \mathbf { y } \sim p ( \mathbf { x } , \mathbf { y } ) } \left[ - \log q ( \mathbf { y } | \mathbf { x } ) \right] . +$$ + +Unfortunately, this estimate is prone to overfitting, and the resulting model can often exploit idiosyncrasies in the data (Krizhevsky et al., 2012; Srivastava et al., 2014). Alemi et al. (2016) proposed regularizing the model using an information bottleneck to encourage the model to focus only on the most discriminative features. The bottleneck can be incorporated by first introducing an encoder $E ( { \bf z } | { \bf x } )$ that maps the features $\mathbf { x }$ to a latent distribution over $Z$ , and then enforcing an upper bound $I _ { c }$ on the mutual information between the encoding and the original features $I ( X , Z )$ . This results in the following regularized objective $J ( \boldsymbol { q } , E )$ + +$$ +\begin{array} { r l } { J ( q , E ) = \underset { q , E } { \mathrm { m i n } } } & { \mathbb { E } _ { \mathbf { x } , \mathbf { y } \sim p ( \mathbf { x } , \mathbf { y } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log q ( \mathbf { y } \vert \mathbf { z } ) \right] \right] } \\ { \mathrm { s . t . } } & { I ( X , Z ) \le I _ { c } . } \end{array} +$$ + +Note that the model $q ( \mathbf { y } \vert \mathbf { z } )$ now maps samples from the latent distribution $\mathbf { z }$ to the label $\mathbf { y }$ . The mutual information is defined according to + +$$ +I ( X , Z ) = \int p ( \mathbf { x } , \mathbf { z } ) \log { \frac { p ( \mathbf { x } , \mathbf { z } ) } { p ( \mathbf { x } ) p ( \mathbf { z } ) } } \ d \mathbf { x } \ d \mathbf { z } \ = \int p ( \mathbf { x } ) E ( \mathbf { z } | \mathbf { x } ) \log { \frac { E ( \mathbf { z } | \mathbf { x } ) } { p ( \mathbf { z } ) } } \ d \mathbf { x } \ d \mathbf { z } \ , +$$ + +where $p ( \mathbf { x } )$ is the distribution given by the dataset. Computing the marginal distribution $\begin{array} { r } { p ( \mathbf { z } ) = \int E ( \mathbf { z } | \mathbf { x } ) p ( \mathbf { x } ) d \mathbf { x } } \end{array}$ can be challenging. Instead, a variational lower bound can be obtained by using an approximation $r ( \mathbf { z } )$ of the marginal. Since KL $[ p ( \mathbf { z } ) | | r ( \mathbf { z } ) ] \geq 0$ , $\begin{array} { r } { \int p ( \mathbf { z } ) \log p ( \mathbf { z } ) d \mathbf { z } \geq } \end{array}$ $\begin{array} { r } { \int p ( \mathbf { z } ) \log r ( \mathbf { z } ) d \mathbf { z } } \end{array}$ , an upper bound on $I ( X , Z )$ can be obtained via the KL divergence, + +$$ +I ( X , Z ) \leq \int p ( \mathbf { x } ) E ( \mathbf { z } | \mathbf { x } ) \log { \frac { E ( \mathbf { z } | \mathbf { x } ) } { r ( \mathbf { z } ) } } d \mathbf { x } d \mathbf { z } = \mathbb { E } _ { \mathbf { x } \sim p ( \mathbf { x } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) \right] \right] . +$$ + +![](images/b3e8e858d6dcdf4c97bb70738e3b1c011f0ac9d11f19000401897e1000d8ecdd.jpg) +Figure 2: Left: Overview of the variational discriminator bottleneck. The encoder first maps samples $\mathbf { x }$ to a latent distribution $E ( { \bf z } | { \bf x } )$ . The discriminator is then trained to classify samples $\mathbf { z }$ from the latent distribution. An information bottleneck $I ( X , Z ) \leq I _ { c }$ is applied to $Z$ . Right: Visualization of discriminators trained to differentiate two Gaussians with different KL bounds $I _ { c }$ . + +This provides an upper bound on the regularized objective $\tilde { J } ( q , E ) \ge J ( q , E )$ , + +$$ +\begin{array} { r l } { \tilde { J } ( q , E ) = \underset { q , E } { \mathrm { m i n } } } & { \mathbb { E } _ { \mathbf { x } , \mathbf { y } \sim p ( \mathbf { x } , \mathbf { y } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log q ( \mathbf { y } \vert \mathbf { z } ) \right] \right] } \\ { \mathrm { s . t . } } & { \mathbb { E } _ { \mathbf { x } \sim p ( \mathbf { x } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } \vert \mathbf { x } ) \vert \vert r ( \mathbf { z } ) \right] \right] \leq I _ { c } . } \end{array} +$$ + +To solve this problem, the constraint can be subsumed into the objective with a coefficient $\beta$ + +$$ +\begin{array} { r l } { \underset { \boldsymbol { q } , E } { \mathop { \operatorname* { m i n } } } } & { \mathbb { E } _ { \mathbf { x } , \mathbf { y } \sim p ( \mathbf { x } , \mathbf { y } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } | \mathbf { x } ) } \left[ - \log q ( \mathbf { y } | \mathbf { z } ) \right] \right] + \beta \left( \mathbb { E } _ { \mathbf { x } \sim p ( \mathbf { x } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) \right] \right] - I _ { c } \right) . } \end{array} +$$ + +Alemi et al. (2016) evaluated the method on supervised learning tasks, and showed that models trained with a VIB can be less prone to overfitting and more robust to adversarial examples. + +# 4 VARIATIONAL DISCRIMINATOR BOTTLENECK + +To outline our method, we first consider a standard GAN framework consisting of a discriminator $D$ and a generator $G$ , where the goal of the discriminator is to distinguish between samples from the target distribution $p ^ { * } ( \mathbf { x } )$ and samples from the generator $G ( \mathbf { x } )$ , + +$$ +\begin{array} { r l } { \underset { G } { \mathop { \operatorname* { m a x } } } \underset { D } { \mathop { \operatorname* { m i n } } } } & { \mathbb { E } _ { \mathbf { x } \sim p ^ { * } ( \mathbf { x } ) } \left[ - \log \left( D ( \mathbf { x } ) \right) \right] + \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } \left[ - \log \left( 1 - D ( \mathbf { x } ) \right) \right] . } \end{array} +$$ + +We incorporate a variational information bottleneck by introducing an encoder $E$ into the discriminator that maps a sample $\mathbf { x }$ to a stochastic encoding $\mathbf { z } \sim E ( \mathbf { z } | \mathbf { x } )$ , and then apply a constraint $I _ { c }$ on the mutual information $I ( X , Z )$ between the original features and the encoding. $D$ is then trained to classify samples drawn from the encoder distribution. A schematic illustration of the framework is available in Figure 2. The regularized objective $J ( D , E )$ for the discriminator is given by + +$$ +\begin{array} { r l } { J ( D , E ) = \underset { D , E } { \operatorname* { m i n } } } & { \mathbb { E } _ { x \sim p ^ { * } ( \mathbf { x } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log \left( D ( \mathbf { z } ) \right) \right] \right] + \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log \left( 1 - D ( \mathbf { z } ) \right) \right] \right] } \\ { \mathrm { s . t . } } & { \mathbb { E } _ { \mathbf { x } \sim \tilde { p } ( \mathbf { x } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) \right] \right] \leq I _ { c } , } \end{array} +$$ + +with $\tilde { p } = { \textstyle \frac { 1 } { 2 } } p ^ { * } + { \textstyle \frac { 1 } { 2 } } G$ being a mixture of the target distribution and the generator. We refer to this regularizer as the variational discriminator bottleneck (VDB). To optimize this objective, we can introduce a Lagrange multiplier $\beta$ , + +$$ +\begin{array} { r l } { I ( D , E ) = \underset { D , E } { \mathrm { m i n } } \underset { \beta \geq 0 } { \mathrm { m a x } } } & { \mathbb { E } _ { \mathbf { x } \sim p ^ { * } ( \mathbf { x } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log \left( D ( \mathbf { z } ) \right) \right] \right] + \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log \left( 1 - D ( \mathbf { z } ) \right) \right] \right. } \\ & { \left. + \beta \left( \mathbb { E } _ { \mathbf { x } \sim \tilde { p } ( \mathbf { x } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) \right| | r ( \mathbf { z } ) \right] \right] - I _ { c } \right) . } \end{array} +$$ + +As we will discuss in Section 4.1 and demonstrate in our experiments, enforcing a specific mutual information budget between $\mathbf { x }$ and $\mathbf { z }$ is critical for good performance. We therefore adaptively update $\beta$ via dual gradient descent to enforce a specific constraint $I _ { c }$ on the mutual information, + +$$ +\begin{array} { r l } & { D , E \gets \arg \operatorname* { m i n } _ { D , E } \mathcal { L } ( D , E , \beta ) } \\ & { \beta \gets \operatorname* { m a x } \big ( 0 , \beta + \alpha _ { \beta } \big ( \mathbb { E } _ { \mathbf { x } \sim \tilde { p } ( \mathbf { x } ) } [ \mathrm { K L } [ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) ] ] - I _ { c } \big ) \big ) , } \end{array} +$$ + +where $\mathcal { L } ( D , E , \beta )$ is the Lagrangian + +$$ +\begin{array} { r l } & { \mathcal { L } ( D , E , \beta ) = \mathbb { E } _ { \mathbf { x } \sim p ^ { * } ( \mathbf { x } ) } [ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } | \mathbf { x } ) } [ - \log ( D ( \mathbf { z } ) ) ] ] + \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } [ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } | \mathbf { x } ) } [ - \log ( 1 - D ( \mathbf { z } ) ) ] ] } \\ & { \quad \quad \quad \quad + \beta ( \mathbb { E } _ { \mathbf { x } \sim \hat { p } ( \mathbf { x } ) } [ \mathrm { K L } [ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) ] ] - I _ { c } ) , } \end{array} +$$ + +and $\alpha _ { \beta }$ is the stepsize for the dual variable in dual gradient descent (Boyd & Vandenberghe, 2004). In practice, we perform only one gradient step on $D$ and $E$ , followed by an update to $\beta$ . We refer to a GAN that incorporates a VDB as a variational generative adversarial network (VGAN). + +In our experiments, the prior $r ( \mathbf { z } ) = \mathcal { N } ( 0 , I )$ is modeled with a standard Gaussian. The encoder $E ( \mathbf { z } | \mathbf { x } ) \overset { - } { = } \mathcal { N } ( \mu _ { E } ( \mathbf { x } ) , \boldsymbol { \Sigma } _ { E } ^ { - } ( \mathbf { x } ) )$ models a Gaussian distribution in the latent variables $Z$ , with mean $\mu _ { E } ( { \bf x } )$ and diagonal covariance matrix $\Sigma _ { E } ( { \bf x } )$ . When computing the KL loss, each batch of data contains an equal number of samples from $p ^ { * } ( x )$ and $G ( x )$ . We use a simplified objective for the generator, + +$$ +\operatorname* { m a x } _ { G } ~ \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } \left[ - \log \left( 1 - D ( \mu _ { E } ( \mathbf { x } ) ) \right) \right] . +$$ + +where the $\mathrm { K L }$ penalty is excluded from the generator’s objective. Instead of computing the expectation over $Z$ , we found that approximating the expectation by evaluating $D$ at the mean $\mu _ { E } ( { \bf x } )$ of the encoder’s distribution was sufficient for our tasks. The discriminator is modeled with a single linear unit followed by a sigmoid $D ( \mathbf { z } ) = \sigma ( \mathbf { w } _ { D } ^ { T } \mathbf { z } + \mathbf { b } _ { D } )$ , with weights $\mathbf { w } _ { D }$ and bias $\mathbf { b } _ { D }$ . + +# 4.1 DISCUSSION AND ANALYSIS + +To interpret the effects of the VDB, we consider the results presented by Arjovsky & Bottou (2017), which show that for two distributions with disjoint support, the optimal discriminator can perfectly classify all samples and its gradients will be zero almost everywhere. Thus, as the discriminator converges to the optimum, the gradients for the generator vanishes accordingly. To address this issue, Arjovsky & Bottou (2017) proposed applying continuous noise to the discriminator inputs, thereby ensuring that the distributions have continuous support everywhere. In practice, if the original distributions are sufficiently distant from each other, the added noise will have negligible effects. As shown by Mescheder et al. (2017), the optimal choice for the variance of the noise to ensure convergence can be quite delicate. In our method, by first using a learned encoder to map the inputs to an embedding and then applying an information bottleneck on the embedding, we can dynamically adjust the variance of the noise such that the distributions not only share support in the embedding space, but also have significant overlap. Since the minimum amount of information required for binary classification is 1 bit, by selecting an information constraint $I _ { c } < 1 $ , the discriminator is prevented from from perfectly differentiating between the distributions. To illustrate the effects of the VDB, we consider a simple task of training a discriminator to differentiate between two Gaussian distributions. Figure 2 visualizes the decision boundaries learned with different bounds $I _ { c }$ on the mutual information. Without a VDB, the discriminator learns a sharp decision boundary, resulting in vanishing gradients for much of the space. But as $I _ { c }$ decreases and the bound tightens, the decision boundary is smoothed, providing more informative gradients that can be leveraged by the generator. + +Taking this analysis further, we can extend Theorem 3.2 from Arjovsky & Bottou (2017) to analyze the VDB, and show that the gradient of the generator will be non-degenerate for a small enough constraint $I _ { c }$ , under some additional simplifying assumptions. The result in Arjovsky & Bottou (2017) states that the gradient consists of vectors that point toward samples on the data manifold, multiplied by coefficients that depend on the noise. However, these coefficients may be arbitrarily small if the generated samples are far from real samples, and the noise is not large enough. This can still cause the generator gradient to vanish. In the case of the VDB, the constraint ensures that these coefficients are always bounded below. Due to space constraints, this result is presented in Appendix A. + +# 4.2 VAIL: VARIATIONAL ADVERSARIAL IMITATION LEARNING + +To extend the VDB to imitation learning, we start with the generative adversarial imitation learning (GAIL) framework (Ho & Ermon, 2016), where the discriminator’s objective is to differentiate between the state distribution induced by a target policy $\pi ^ { * } ( \mathbf { s } )$ and the state distribution of the agent’s policy $\pi ( \mathbf { s } )$ , + +$$ +\operatorname* { m a x } _ { \pi } \operatorname* { m i n } _ { D } \quad \mathbb { E } _ { \mathbf { s } \sim \pi ^ { * } ( \mathbf { s } ) } \left[ - \log \left( D ( \mathbf { s } ) \right) \right] + \mathbb { E } _ { \mathbf { s } \sim \pi ( \mathbf { s } ) } \left[ - \log \left( 1 - D ( \mathbf { s } ) \right) \right] . +$$ + +![](images/30d57dddd51de39696f83d45f9cb8ba9fe5f6258906497db5bb38f50fa1a90ca.jpg) +Figure 3: Simulated humanoid performing various skills. VAIL is able to closely imitate a broad range of skills from mocap data. + +The discriminator is trained to maximize the likelihood assigned to states from the target policy, while minimizing the likelihood assigned to states from the agent’s policy. The discriminator also serves as the reward function for the agent, which encourages the policy to visit states that, to the discriminator, appear indistinguishable from the demonstrations. Similar to the GAN framework, we can incorporate a VDB into the discriminator, + +$$ +\begin{array} { r l } & { I ( D , E ) = \underset { D , E } { \mathrm { m i n } } \underset { \beta \geq 0 } { \mathrm { m a x } } \mathbb { E } _ { \mathbf { s } \sim \pi ^ { * } ( \mathbf { s } ) } [ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { s } ) } [ - \log ( D ( \mathbf { z } ) ) ] ] + \mathbb { E } _ { \mathbf { s } \sim \pi ( \mathbf { s } ) } [ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { s } ) } [ - \log ( 1 - D ( \mathbf { z } ) ) ] ] } \\ & { \qquad + \beta ( \mathbb { E } _ { \mathbf { s } \sim \pi ( \mathbf { s } ) } [ \mathrm { K L } [ E ( \mathbf { z } \mid \mathbf { s } ) ] \mid \mid r ( \mathbf { z } ) ] ] - I _ { c } ) . } \end{array} +$$ + +where $\tilde { \pi } = { \textstyle \frac { 1 } { 2 } } \pi ^ { * } + { \textstyle \frac { 1 } { 2 } } \pi$ represents a mixture of the target policy and the agent’s policy. The reward for $\pi$ is then specified by the discriminator $r _ { t } = - \mathrm { l o g } \bar { ( 1 - D ( \mu _ { E } ( \mathbf { s } ) ) ) }$ . We refer to this method as variational adversarial imitation learning (VAIL). + +# 4.3 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING + +The VDB can also be applied to adversarial inverse reinforcement learning (Fu et al., 2017) to yield a new algorithm which we call variational adversarial inverse reinforcement learning (VAIRL). AIRL operates in a similar manner to GAIL, but with a discriminator of the form + +$$ +D ( { \bf s } , { \bf a } , { \bf s } ^ { \prime } ) = \frac { \exp \left( f ( { \bf s } , { \bf a } , { \bf s } ^ { \prime } ) \right) } { \exp \left( f ( { \bf s } , { \bf a } , { \bf s } ^ { \prime } ) \right) + \pi ( { \bf a } | { \bf s } ) } , +$$ + +where $f ( \mathbf { s } , \mathbf { a } , \mathbf { s } ^ { \prime } ) = g ( \mathbf { s } , \mathbf { a } ) + \gamma h ( \mathbf { s } ^ { \prime } ) - h ( \mathbf { s } )$ , with $g$ and $h$ being learned functions. Under certain restrictions on the environment, Fu et al. show that if $g ( \mathbf { s } , \mathbf { a } )$ is defined to depend only on the current state s, the optimal $g ( \mathbf { s } )$ recovers the expert’s true reward function $r ^ { * } ( \mathbf { s } )$ up to a constant $g ^ { * } ( \mathbf { s } ) =$ $r ^ { * } ( \mathbf { s } ) + \mathrm { c o n s i }$ . In this case, the learned reward can be re-used to train policies in environments with different dynamics, and will yield the same policy as if the policy was trained under the expert’s true reward. In contrast, GAIL’s discriminator typically cannot be re-optimized in this way $\mathrm { F u }$ et al., 2017). In VAIRL, we introduce stochastic encoders $E _ { g } ( \mathbf { z } _ { g } | \mathbf { s } ) , E _ { h } ( \mathbf { z } _ { h } | \mathbf { s } )$ , and $g ( \mathbf { z } _ { g } ) , h ( \mathbf { z } _ { h } )$ are modified to be functions of the encoding. We can reformulate Equation 13 as + +$$ +D ( { \bf s } , { \bf a } , { \bf z } ) = \frac { \exp \left( f ( { \bf z } _ { g } , { \bf z } _ { h } , { \bf z } _ { h } ^ { \prime } ) \right) } { \exp \left( f ( { \bf z } _ { g } , { \bf z } _ { h } , { \bf z } _ { h } ^ { \prime } ) \right) + \pi ( { \bf a } | { \bf s } ) } , +$$ + +for ${ \bf z } = ( { \bf z } _ { g } , { \bf z } _ { h } , { \bf z } _ { h } ^ { \prime } )$ and $f ( \mathbf { z } _ { g } , \mathbf { z } _ { h } , \mathbf { z } _ { h } ^ { \prime } ) = D _ { g } ( \mathbf { z } _ { g } ) + \gamma D _ { h } ( \mathbf { z } _ { h } ^ { \prime } ) - D _ { h } ( \mathbf { z } _ { h } )$ . We then obtain a modified objective of the form + +$$ +\begin{array} { r l } { J ( D , E ) = \underset { D , E } { \mathrm { m i n } } \underset { \beta \geq 0 } { \mathrm { m a x } } } & { \mathbb { E } _ { \mathbf { s } , \mathbf { s } ^ { \prime } \sim \pi ^ { * } ( \mathbf { s } , \mathbf { s } ^ { \prime } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { s } , \mathbf { s } ^ { \prime } ) } \left[ - \log \left( D ( \mathbf { s } , \mathbf { a } , \mathbf { z } ) \right) \right] \right] } \\ & { + \mathbb { E } _ { \mathbf { s } , \mathbf { s } ^ { \prime } \sim \pi ( \mathbf { s } , \mathbf { s } ^ { \prime } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { s } , \mathbf { s } ^ { \prime } ) } \left[ - \log \left( 1 - D ( \mathbf { s } , \mathbf { a } , \mathbf { z } ) \right) \right] \right] } \\ & { + \beta \left( \mathbb { E } _ { \mathbf { s } , \mathbf { s } ^ { \prime } \sim \pi ( \mathbf { s } , \mathbf { s } ^ { \prime } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } \mid \mathbf { s } , \mathbf { s } ^ { \prime } ) | | r ( \mathbf { z } ) \right] \right] - I _ { c } \right) , } \end{array} +$$ + +where $\pi ( s , s ^ { \prime } )$ denotes the joint distribution of successive states from a policy, and $E ( \mathbf { z } | \mathbf { s } , \mathbf { s } ^ { \prime } ) =$ $E _ { g } ( \mathbf { z } _ { g } | \mathbf { s } ) { \cdot } E _ { h } ( \mathbf { z } _ { h } | \mathbf { s } ) { \cdot } E _ { h } ( \mathbf { z } _ { h } ^ { \prime } | \bar { \mathbf { s } } ^ { \prime } )$ . + +![](images/f8345f9a0288395a6d57696ed487a1c948855dd61361b99c00b0067aa21d534b.jpg) +Figure 4: Learning curves comparing VAIL to other methods for motion imitation. Performance is measured using the average joint rotation error between the simulated character and the reference motion. Each method is evaluated with 3 random seeds. + +
MethodBackflipCartwheelDanceRunSpinkick
BC3.012.882.932.632.88
Merel et al., 20171.33 ± 0.031.47 ± 0.122.61 ± 0.300.52 ± 0.041.82 ± 0.35
GAIL0.74±0.150.84± 0.051.31 ± 0.160.17±0.031.07 ± 0.03
GAIL -noise0.42±0.020.92±0.070.96±0.080.21±0.050.95±0.14
GAIL - noise z0.67±0.120.72± 0.041.14 ± 0.080.14±0.030.64±0.09
GAIL - GP0.62±0.090.69 ±0.050.80± 0.320.12 ± 0.020.64± 0.04
VAIL (ours)0.36±0.130.40±0.080.40±0.210.13±0.010.34± 0.05
VAIL - GP (ours)0.46±0.170.31 ± 0.020.15±0.010.10±0.010.31 ± 0.02
Peng et al., 20180.260.210.200.140.19
+ +Table 1: Average joint rotation error (radians) on humanoid motion imitation tasks. VAIL outperforms the other methods for all skills evaluated, except for policies trained using the manuallydesigned reward function from (Peng et al., 2018). + +# 5 EXPERIMENTS + +We evaluate our method on adversarial learning problems in imitation learning, inverse reinforcement learning, and image generation. In the case of imitation learning, we show that the VDB enables agents to learn complex motion skills from a single demonstration, including visual demonstrations provided in the form of video clips. We also show that the VDB improves the performance of inverse RL methods. Inverse RL aims to reconstruct a reward function from a set demonstrations, which can then used to perform the task in new environments, in contrast to imitation learning, which aims to recover a policy directly. Our method is also not limited to control tasks, and we demonstrate its effectiveness for unconditional image generation. + +# 5.1 VAIL: VARIATIONAL ADVERSARIAL IMITATION LEARNING + +The goal of the motion imitation tasks is to train a simulated character to mimic demonstrations provided by mocap clips recorded from human actors. Each mocap clip provides a sequence of target states $\big \{ \mathbf { s } _ { 0 } ^ { * } , \mathbf { s } _ { 1 } ^ { * } , . . . , \mathbf { s } _ { T } ^ { * } \big \}$ that the character should track at each timestep. We use a similar experimental setup as Peng et al. (2018), with a 34 degrees-of-freedom humanoid character. We found that the discriminator architecture can greatly affect the performance on complex skills. The particular architecture we employ differs substantially from those used in prior work (Merel et al., 2017), details of which are available in Appendix C. The encoding $Z$ is 128D and an information constraint of $I _ { c } = 0 . 5$ is applied for all skills, with a dual stepsize of $\alpha _ { \beta } = 1 0 ^ { - 5 }$ . All policies are trained using PPO (Schulman et al., 2017). + +The motions learned by the policies are best seen in the supplementary video. Snapshots of the character’s motions are shown in Figure 3. Each skill is learned from a single demonstration. VAIL is able to closely reproduce a variety of skills, including those that involve highly dynamics flips and complex contacts. We compare VAIL to a number of other techniques, including state-only GAIL (Ho & Ermon, 2016), GAIL with instance noise applied to the discriminator inputs (GAIL - noise), GAIL with instance noise applied to the last hidden layer (GAIL - noise z), and GAIL with a gradient penalty applied to the discriminator (GAIL - GP) (Mescheder et al., 2018). Since the VDB helps to prevent vanishing gradients, while GP mitigates exploding gradients, the two techniques can be seen as being complementary. Therefore, we also train a model that combines both VAIL and GP (VAIL - + +![](images/7497cb73e50bbfbd813c2ffce4161f7254aec761aabb16358d90c1638d8e73f8.jpg) +Figure 5: Left: Snapshots of the video demonstration and the simulated character trained with VAIL. The policy learns to run by directly imitating the video. Right: Saliency maps that visualize the magnitude of the discriminator’s gradient with respect to all channels of the RGB input images from both the demonstration and the simulation. Pixel values are normalized between [0, 1]. + +![](images/5f2f5cf0687f611bc03d408752373a1aaf35da53c395f876a101449a9d723a44.jpg) +Figure 6: Left: Learning curves comparing policies for the video imitation task trained using a pixel-wise loss as the reward, GAIL, and VAIL. Only VAIL successfully learns to run from a video demonstration. Middle: Effect of training with fixed values of $\beta$ and adaptive $\beta$ $I _ { c } = 0 . 5$ ). Right:. KL loss over the course of training with adaptive $\beta$ . The dual gradient descent update for $\beta$ effectively enforces the VDB constraint $I _ { c }$ . + +GP). Implementation details for combining the VDB and GP are available in Appendix B. Learning curves for the various methods are shown in Figure 10 and Table 1 summarizes the performance of the final policies. Performance is measured in terms of the average joint rotation error between the simulated character and the reference motion. We also include a reimplementation of the method described by Merel et al. (2017). For the purpose of our experiments, GAIL denotes policies trained using our particular architecture but without a VDB, and Merel et al. (2017) denotes policies trained using an architecture that closely mirror those from previous work. Furthermore, we include comparisons to policies trained using the handcrafted reward from Peng et al. (2018), as well as policies trained via behavioral cloning (BC). Since mocap data does not provide expert actions, we use the policies from Peng et al. (2018) as oracles to provide state-action demonstrations, which are then used to train the BC policies via supervised learning. Each BC policy is trained with $1 0 \mathrm { k }$ samples from the oracle policies, while all other policies are trained from just a single demonstration, the equivalent of approximately 100 samples. + +VAIL consistently outperforms previous adversarial methods, and VAIL - GP achieves the best performance overall. Simply adding instance noise to the inputs (Salimans et al., 2016) or hidden layer without the KL constraint (Sønderby et al., 2016) leads to worse performance, since the network can learn a latent representation that renders the effects of the noise negligible. Though training with the handcrafted reward still outperforms the adversarial methods, VAIL demonstrates comparable performance to the handcrafted reward without manual reward or feature engineering, and produces motions that closely resemble the original demonstrations. The method from Merel et al. (2017) was able to imitate simple skills such as running, but was unable to reproduce more acrobatic skills such as the backflip and spinkick. In the case of running, our implementation produces more natural gaits than the results reported in Merel et al. (2017). Behavioral cloning is unable to reproduce any of the skills, despite being provided with substantially more demonstration data than the other methods. + +Video Imitation: While our method achieves substantially better results on motion imitation when compared to prior work, previous methods can still produce reasonable behaviors. However, if the demonstrations are provided in terms of the raw pixels from video clips, instead of mocap data, the imitation task becomes substantially harder. The goal of the agent is therefore to directly imitate the skill depicted in the video. This is also a setting where manually engineering rewards is impractical, since simple losses like pixel distance do not provide a semantically meaningful measure of similarity. Figure 6 compares learning curves of policies trained with VAIL, GAIL, and policies trained using a reward function defined by the average pixel-wise difference between the frame $M _ { t } ^ { * }$ from the video demonstration and a rendered image $M _ { t }$ of the agent at each timestep $t$ , $\begin{array} { r } { r _ { t } = 1 - \frac { 1 } { 3 \times 6 4 ^ { 2 } } | | M _ { t } ^ { * } - M _ { t } | | ^ { 2 } } \end{array}$ . Each frame is represented by a $6 4 \times 6 4$ RGB image. + +![](images/9a3768a8c49373d423021d089034c2c03922c0410f3b165f6f1fe6e355dafe56.jpg) +Figure 7: Left: C-Maze and S-Maze. When trained on the training maze on the left, AIRL learns a reward that overfits to the training task, and which cannot be transferred to the mirrored maze on the right. In contrast, VAIRL learns a smoother reward function that enables more-reliable transfer. Right: Performance on flipped test versions of our two training mazes. We report mean return ( $\pm$ std. dev.) over five runs, and the mean return for the expert used to generate demonstrations. + +
MethodTransferenvironments
C-mazeS-maze
GAIL-24.6±7.21.0±1.3
VAIL-65.6±18.920.8±39.7
AIRL-15.3±7.8-0.2±0.1
AIRL - GP-9.14±0.4-0.14±0.3
VAIRL (β = 0)-25.5±7.262.3±33.2
VAIRL (ours)-10.0±2.274.0±38.7
VAIRL - GP (ours)-9.18±0.4156.5±5.6
TRPO expert-5.1153.2
+ +Both GAIL and the pixel-loss are unable to learn the running gait. VAIL is the only method that successfully learns to imitate the skill from the video demonstration. Snapshots of the video demonstration and the simulated motion is available in Figure 5. To further investigate the effects of the VDB, we visualize the gradient of the discriminator with respect to images from the video demonstration and simulation. Saliency maps for discriminators trained with VAIL and GAIL are available in Figure 5. The VAIL discriminator learns to attend to spatially coherent image patches around the character, while the GAIL discriminator exhibits less structure. The magnitude of the gradients from VAIL also tend to be significantly larger than those from GAIL, which may suggests that VAIL is able to mitigate the problem of vanishing gradients present in GAIL. + +Adaptive Constraint: To evaluate the effects of the adaptive $\beta$ updates, we compare policies trained with different fixed values of $\beta$ and policies where $\beta$ is updated adaptively to enforce a desired information constraint $I _ { c } = 0 . 5$ . Figure 6 illustrates the learning curves and the KL loss over the course of training. When $\beta$ is too small, performance reverts to that achieved by GAIL. Large values of $\beta$ help to smooth the discriminator landscape and improve learning speed during the early stages of training, but converges to a worse performance. Policies trained using dual gradient descent to adaptively update $\beta$ consistently achieves the best performance overall. + +# 5.2 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING + +Next, we use VAIRL to recover reward functions from demonstrations. Unlike the discriminator learned by VAIL, the reward function recovered by VAIRL can be re-optimized to train new policies from scratch in the same environment. In some cases, it can also be used to transfer similar behaviour to different environments. In Figure 7, we show the results of applying VAIRL to the C-maze from Fu et al. (2017), and a more complex S-maze; the simple 2D observation spaces of these tasks make it easy to interpret the recovered reward functions. In both mazes, the expert is trained to navigate from a start position at the bottom of the maze to a fixed target position at the top. We use each method to obtain an imitation policy and to approximate the expert’s reward on the original maze. The recovered reward is then used to train a new policy to solve a left–right flipped version of the training maze. On the C-maze, we found that plain AIRL—without a gradient penalty— would sometimes overfit and fail to transfer to the new environment, as evidenced by the reward visualization in Figure 7 (left) and the higher return variance in Figure 7 (right). In contrast, by incorporating a VDB into AIRL, VAIRL learns a substantially smoother reward function that is more suitable for transfer. Furthermore, we found that in the S-maze with two internal walls, AIRL was too unstable to acquire a meaningful reward function. This was true even with the use of a gradient penalty. In contrast, VAIRL was able to learn a reasonable reward in most cases without a gradient penalty, and its performance improved even further with the addition of a gradient penalty. To evaluate the effects of the VDB, we observe that the performance of VAIRL drops on both tasks when the KL constraint is disabled $\mathcal { B } = 0$ ), suggesting that the improvements from the VDB cannot be attributed entirely to the noise introduced by the sampling process for z. Further details of these experiments and illustrations of the recovered reward functions are available in Appendix D. + +![](images/c86c34eae7b7dab70e64c321c0f81908e190aa387a041d3cc2f92e4b2ee908cc.jpg) + +![](images/78b0c0503897ba4746233494cfd31890b086ca770f3439471530fef4c520776d.jpg) +Figure 8: Comparison of VGAN and other methods on CIFAR-10, with performance evaluated using the Frechet Inception Distance (FID). ´ +Figure 9: VGAN samples on CIFAR-10, CelebA $1 2 8 \times 1 2 8$ , and CelebAHQ $1 0 2 4 \times 1 0 2 4$ . + +# 5.3 VGAN: VARIATIONAL GENERATIVE ADVERSARIAL NETWORKS + +Finally, we apply the VDB to image generation with generative adversarial networks, which we refer to as VGAN. Experiment are conducted on CIFAR-10 (Krizhevsky et al.), CelebA (Liu et al. (2015)), and CelebAHQ (Karras et al., 2018) datasets. We compare our approach to recent stabilization techniques: WGAN-GP (Gulrajani et al., 2017b), instance noise (Sønderby et al., 2016; Arjovsky & Bottou, 2017), spectral normalization (SN) (Miyato et al., 2018), and gradient penalty (GP) (Mescheder et al., 2018), as well as the original GAN (Goodfellow et al., 2014) on CIFAR10. To measure performance, we report the Frechet Inception Distance (FID) (Heusel et al., 2017), ´ which has been shown to be more consistent with human evaluation. All methods are implemented using the same base model, built on the resnet architecture of Mescheder et al. (2018). Aside from tuning the KL constraint $I _ { c }$ for VGAN, no additional hyperparameter optimization was performed to modify the settings provided by Mescheder et al. (2018). The performance of the various methods on CIFAR-10 are shown in Figure 8. While vanilla GAN and instance noise are prone to diverging as training progresses, VGAN remains stable. Note that instance noise can be seen as a non-adaptive version of VGAN without constraints on $I _ { c }$ . This experiment again highlights that there is a significant improvement from imposing the information bottleneck over simply adding instance noise. Combining both VDB and gradient penalty (VGAN - GP) achieves the best performance overall with an FID of 18.1. We also experimented with combining the VDB with SN, but this combination is prone to diverging. See Figure 9 for samples of images generated with our approach. Please refer to Appendix E for experimental details and more results. + +# 6 CONCLUSION + +We present the variational discriminator bottleneck, a general regularization technique for adversarial learning. Our experiments show that the VDB is broadly applicable to a variety of domains, and yields significant improvements over previous techniques on a number of challenging tasks. While our experiments have produced promising results for video imitation, the results have been primarily with videos of synthetic scenes. We believe that extending the technique to imitating realworld videos is an exciting direction. Another exciting direction for future work is a more in-depth theoretical analysis of the method, to derive convergence and stability results or conditions. + +# ACKNOWLEDGEMENTS + +We would like to thank the anonymous reviewers for their helpful feedback, and AWS and NVIDIA for providing computational resources. This research was funded by an NSERC Postgraduate Scholarship, a Berkeley Fellowship for Graduate Study, BAIR, Huawei, and ONR PECASE N000141612723. + +# REFERENCES + +Alessandro Achille and Stefano Soatto. 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URL http://arxiv.org/abs/1609.03126. + +SUPPLEMENTARY MATERIAL + +# A ANALYSIS AND PROOFS + +In this appendix, we show that the gradient of the generator when the discriminator is augmented with the VDB is non-degenerate, under some mild additional assumptions. First, we assume a pointwise constraint of the form $\mathrm { K L } [ E ( \mathbf { z } | \mathbf { x } ) \| r ( \mathbf { z } ) ] \leq I _ { c }$ for all $\mathbf { x }$ . In reality, we use an average KL constraint, since we found it to be more convenient to optimize, though a pointwise constraint is also possible to enforce by using the largest constraint violation to increment $\beta$ . We could likely also extend the analysis to the average constraint, though we leave this to future work. The main theorem can then be stated as follows: + +Theorem A.1. Let $g ( \mathbf { u } )$ denote the generator’s mapping from a noise vector $\mathbf { u } \sim p ( \mathbf { u } )$ to a point in $X$ . Given the generator distribution $G ( \mathbf { x } )$ and data distribution $p ^ { * } ( \mathbf { x } )$ , a VDB with an encoder $E ( \mathbf { z } | \mathbf { x } ) = \mathcal { N } ( \mu _ { E } ( \mathbf { x } ) , \Sigma )$ , and $\mathrm { K L } [ E ( \mathbf { z } | \mathbf { x } ) \| r ( \mathbf { z } ) ] \leq I _ { c } ,$ the gradient passed to the generator has the form + +$$ +\begin{array} { l } { \nabla _ { g } \mathbb { E } _ { { \mathbf { u } } \sim p ( { \mathbf { u } } ) } \left[ \log \left( 1 - D ^ { * } ( \mu _ { E } ( g ( { \mathbf { u } } ) ) ) \right) \right] } \\ { = \mathbb { E } _ { { \mathbf { u } } \sim p ( { \mathbf { u } } ) } \left[ a ( { \mathbf { u } } ) \int E ( \mu _ { E } ( g ( { \mathbf { u } } ) ) | { \mathbf { x } } ) \nabla _ { g } | | \mu _ { E } ( g ( { \mathbf { u } } ) ) - \mu _ { E } ( { \mathbf { x } } ) | | ^ { 2 } d p ^ { * } ( { \mathbf { x } } ) \right. } \\ { \left. - b ( { \mathbf { u } } ) \int E ( \mu _ { E } ( g ( { \mathbf { u } } ) ) | { \mathbf { x } } ) \nabla _ { g } | | \mu _ { E } ( g ( { \mathbf { u } } ) ) - \mu _ { E } ( { \mathbf { x } } ) | | ^ { 2 } d G ( { \mathbf { x } } ) \right] } \end{array} +$$ + +where $D ^ { * } ( \mathbf { z } )$ is the optimal discriminator, $a ( \mathbf { x } )$ and $b ( \mathbf { x } )$ are positive functions, and we always have $E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } ) > C ( I _ { c } )$ , where $C ( I _ { c } )$ is a continuous monotonic function, and $C ( I _ { c } ) \delta > 0$ as $I _ { c } \to 0$ . + +Analysis for an encoder with an input-dependent variance $\Sigma ( \mathbf { x } )$ is also possible, but more involved. We’ll further assume below for notational simplicity that $\Sigma$ is diagonal with diagonal values $\sigma ^ { 2 }$ . This assumption is not required, but substantially simplifies the linear algebra. Analogously to Theorem 3.2 from Arjovsky & Bottou (2017), this theorem states that the gradient of the generator points in the direction of points in the data distribution, and away from points in the generator distribution. However, going beyond the theorem in Arjovsky & Bottou (2017), this result states that the coefficients on these vectors, given by $E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } )$ , are always bounded below by a value that approaches a positive constant $\delta$ as we decrease $I _ { c }$ , meaning that the gradient does not vanish. The proof of the first part of this theorem is essentially identical to the proof presented by Arjovsky & Bottou (2017), but accounting for the fact that the noise is now injected into the latent space of the VDB, rather than being added directly to $\mathbf { x }$ . This result assumes that $E ( { \bf z } | { \bf x } )$ has a learned but input-independent variance $\Sigma = \sigma ^ { 2 } I$ , though the proof can be repeated for an input-dependent or non-diagonal $\Sigma$ : + +Proof. Overloading $p ^ { * } ( \mathbf { x } )$ and $G ( \mathbf { x } )$ , let $p ^ { * } ( \mathbf { z } )$ and $G ( \mathbf { z } )$ be the distribution of embeddings $\mathbf { z }$ under the real data and generator respectively. $p ^ { * } ( \mathbf { z } )$ is then given by + +$$ +p ^ { * } ( \mathbf { z } ) = \mathbb { E } _ { \mathbf { x } \sim p ^ { * } ( \mathbf { x } ) } \left[ E ( \mathbf { z } | \mathbf { x } ) \right] = \int E ( \mathbf { z } | \mathbf { x } ) d p ^ { * } ( \mathbf { x } ) , +$$ + +and similarly for $G ( z )$ + +$$ +G ( \mathbf { z } ) = \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } \left[ E ( \mathbf { z } | \mathbf { x } ) \right] = \int E ( \mathbf { z } | \mathbf { x } ) d G ( \mathbf { x } ) , +$$ + +From Arjovsky $\&$ Bottou (2017), the optimal discriminator between $p ^ { * } ( \mathbf { z } )$ and $G ( \mathbf { z } )$ is + +$$ +D ^ { * } ( \mathbf { z } ) = \frac { p ^ { * } ( \mathbf { z } ) } { p ^ { * } ( \mathbf { z } ) + G ( \mathbf { z } ) } +$$ + +The gradient passed to the generator then has the form + +$$ +\begin{array} { r l } & { \nabla _ { g } \mathbb { E } _ { \mathbf { u } \sim p ( \mathbf { u } ) } \left[ \log \left( 1 - D ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) \right) \right] } \\ & { \qquad = \mathbb { E } _ { \mathbf { u } \sim p ( \mathbf { u } ) } \left[ \nabla _ { g } \log \left( G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) \right) - \nabla _ { g } \log \left( p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) + G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) \right) \right] } \\ & { \qquad = \mathbb { E } _ { \mathbf { u } \sim p ( \mathbf { u } ) } \left[ \frac { \nabla _ { g } G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } { G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } - \frac { \nabla _ { g } p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) + \nabla _ { g } G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } { p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) + G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } \right] } \\ & { \qquad = \mathbb { E } _ { \mathbf { u } \sim p ( \mathbf { u } ) } \left[ \frac { 1 } { p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) + G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } \nabla _ { g } \left[ - p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) \right] \right. } \\ & { \qquad \left. - \frac { 1 } { p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) + G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } \frac { p ^ { * } ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } { G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) } \nabla _ { g } \left[ - G ( \mu _ { E } ( g ( \mathbf { u } ) ) ) \right] \right] . } \end{array} +$$ + +Let + +$$ +\begin{array} { l } { { \displaystyle a ( { \bf u } ) = \frac { 1 } { 2 \sigma ^ { 2 } } \frac { 1 } { p ^ { * } \left( \mu _ { E } ( g ( { \bf u } ) ) \right) + G \left( \mu _ { E } ( g ( { \bf u } ) ) \right) } \ ~ } } \\ { { \displaystyle b ( { \bf u } ) = \frac { 1 } { 2 \sigma ^ { 2 } } \frac { 1 } { p ^ { * } \left( \mu _ { E } ( g ( { \bf u } ) ) \right) + G \left( \mu _ { E } ( g ( { \bf u } ) ) \right) } \frac { p ^ { * } \left( \mu _ { E } ( g ( { \bf u } ) ) \right) } { G \left( \mu _ { E } ( g ( { \bf u } ) ) \right) } . } } \end{array} +$$ + +We then have + +$$ +\begin{array} { r l } & { \varepsilon _ { \mathrm { S P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ^ { 2 } ( \varepsilon ) ( \varepsilon ) ( \eta ) \} } \\ & { \quad - \varepsilon _ { \mathrm { S P } } ( \varepsilon ) \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ^ { 2 } ( \varepsilon ) ( \eta ) \} = \int _ { - \varepsilon } ^ { \varepsilon } \gamma _ { \varepsilon } \varepsilon _ { \mathrm { P } } ( \varepsilon ) ( \varepsilon ) ( \eta ) - 2 \eta ^ { \varepsilon } \varepsilon _ { \mathrm { P } } ( \varepsilon ) ( \eta ) \int _ { - \varepsilon } ^ { \varepsilon } \varepsilon _ { \mathrm { P } } ( \varepsilon ) ( \varepsilon ) ( \eta ) \int _ { - \varepsilon } ^ { \varepsilon } \varepsilon _ { \mathrm { P } } ( \varepsilon ) ( \varepsilon ) ( \eta ) } \\ & { \quad - \varepsilon _ { \mathrm { P } } ( \varepsilon ) \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ( \varepsilon ) ( \eta ) \} - \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } \varepsilon _ { \mathrm { P } } ( \varepsilon ) ( \eta ) \varepsilon _ { \mathrm { P } } ( \varepsilon ) ( \eta ) } \\ & { \quad - \varepsilon _ { \mathrm { P } } ( \varepsilon ) \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ( \varepsilon ) ( \eta ) \} } \\ & { \quad - \varepsilon _ { \mathrm { S P } } ( \varepsilon ) \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ^ { 2 } ( \varepsilon ) ( \eta ) \} \int _ { - \varepsilon } ^ { \varepsilon } \varepsilon _ { \mathrm { P } } ^ { \varepsilon } \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ( \varepsilon ) ( \eta ) \} } \\ & \quad - \varepsilon _ { \mathrm { P } } ( \varepsilon ) \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon ) \{ 2 \sigma ^ { 2 } ( \eta ) \} + \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ( \varepsilon _ { \mathrm { P } } ^ { ( \varepsilon ) } ) - \mu _ \ \end{array} +$$ + +Similar to the result from Arjovsky & Bottou (2017), the gradient of the generator drives the generator’s samples in the embedding space $\mu _ { E } ( g ( { \bf u } ) )$ towards embeddings of the points from the dataset $\mu _ { E } ( { \bf x } )$ weighted by their likelihood $E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } )$ under the real data. For an arbitrary encoder $E$ , real and fake samples in the embedding may be far apart. As such, the coefficients $E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } )$ can be arbitrarily small, thereby resulting in vanishing gradients for the generator. + +The second part of the theorem states that $C ( I _ { c } )$ is a continuous monotonic function, and $C ( I _ { c } ) \delta > 0$ as $I _ { c } \to 0$ . This is the main result, and relies on the fact that $\mathrm { K L } [ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) ] \leq I _ { c }$ . The intuition behind this result is that, for any two inputs $\mathbf { x }$ and $\mathbf { y }$ , their encoded distributions $E ( { \bf z } | { \bf x } )$ and $E ( \mathbf { z } | \mathbf { y } )$ have means that cannot be more than some distance apart, and that distance shrinks with $I _ { c }$ . This allows us to bound $E ( \mu _ { E } ( \mathbf { y } ) ) | \mathbf { x } )$ below by $C ( I _ { c } )$ , which ensures that the coefficients on the vectors in the theorem above are always at least as large as $C ( I _ { c } )$ . + +Proof. Let $r ( \mathbf { z } ) = \mathcal { N } ( 0 , I )$ be the prior distribution and suppose the $\mathrm { K L }$ divergence for all $\mathbf { x }$ in the dataset and all $g ( \mathbf { u } )$ generated by the generator are bounded by $I _ { c }$ + +$$ +\begin{array} { r l } & { \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) \right] \leq I _ { c } , \quad \forall \mathbf { x } , \ \mathbf { x } \sim p ^ { * } ( \mathbf { x } ) } \\ & { \mathrm { K L } \left[ E ( \mathbf { z } | g ( \mathbf { u } ) ) | | r ( \mathbf { z } ) \right] \leq I _ { c } , \quad \forall \mathbf { u } , \ \mathbf { u } \sim p ( \mathbf { u } ) . } \end{array} +$$ + +From the definition of the KL-divergence we can bound the length of all embedding vectors, + +$$ +\begin{array} { r } { \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) \right] = \displaystyle \frac { 1 } { 2 } \left( K \sigma ^ { 2 } + \mu _ { E } ( \mathbf { x } ) ^ { T } \mu _ { E } ( \mathbf { x } ) - K - K \log \sigma ^ { 2 } \right) \leq I _ { c } } \\ { | | \mu _ { E } ( \mathbf { x } ) | | ^ { 2 } \leq 2 I _ { c } - K \sigma ^ { 2 } + K + K \log \sigma ^ { 2 } , } \end{array} +$$ + +and similarly for $| | \mu _ { E } ( g ( \mathbf { u } ) ) | | ^ { 2 }$ , with $K$ denoting the dimension of $Z$ . A lower bound on $E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } )$ , where $\mathbf { u } \sim p ( \mathbf { u } )$ and $\mathbf { x } \sim p ^ { * } ( \mathbf { x } )$ , can then be determined by + +$$ +\begin{array} { l } { { \displaystyle { E ( \mu _ { E } ( g ( { \bf u } ) ) \vert { \bf x } ) } ) = - \frac { 1 } { 2 \sigma ^ { 2 } } \left( \mu _ { E } ( g ( { \bf u } ) ) - \mu _ { E } ( { \bf x } ) \right) ^ { T } \left( \mu _ { E } ( g ( { \bf u } ) ) - \mu _ { E } ( { \bf x } ) \right) - \frac { K } { 2 } \log \sigma ^ { 2 } - \frac { K } { 2 } \log 2 \pi } } \\ { { \displaystyle \approx \vert \vert \mu _ { E } ( { \bf x } ) \vert \vert ^ { 2 } , \vert \vert \mu _ { E } ( g ( { \bf u } ) ) \vert \vert ^ { 2 } \le 2 I _ { c } - K \sigma ^ { 2 } + K + K \log \sigma ^ { 2 } , \ ~ } } \\ { { \displaystyle \qquad \vert \vert \mu _ { E } ( g ( { \bf u } ) ) - \mu _ { E } ( { \bf x } ) \vert \vert ^ { 2 } \le 8 I _ { c } - 4 K \sigma ^ { 2 } + 4 K + 4 K \log \sigma ^ { 2 } , } } \end{array} +$$ + +and it follows that + +$$ +- \frac { 1 } { 2 \sigma ^ { 2 } } \left( \mu _ { E } ( g ( { \bf u } ) ) - \mu _ { E } ( { \bf x } ) \right) ^ { T } \left( \mu _ { E } ( g ( { \bf u } ) ) - \mu _ { E } ( { \bf x } ) \right) \ge - 4 \sigma ^ { - 2 } I _ { c } + 2 K - 2 K \sigma ^ { - 2 } - 2 K \sigma ^ { - 2 } \log \sigma ^ { - 2 } . +$$ + +The likelihood is therefore bounded below by + +$$ +\begin{array} { c } { { \displaystyle \log \left( E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } ) \right) \geq - 4 \sigma ^ { - 2 } I _ { c } + 2 K - 2 K \sigma ^ { - 2 } - 2 K \sigma ^ { - 2 } \log { \sigma ^ { - 2 } } - \frac { K } { 2 } \log { \sigma ^ { 2 } } - \frac { K } { 2 } \log { 2 \pi } } } \\ { { \displaystyle \mathrm { S i n c e - } \sigma ^ { - 2 } - \sigma ^ { - 2 } \log { \sigma ^ { - 2 } } \geq - 1 , \hfill } } \\ { { \displaystyle \log \left( E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } ) \right) \geq - 4 \sigma ^ { - 2 } I _ { c } - \frac { K } { 2 } \log { \sigma ^ { 2 } } - \frac { K } { 2 } \log { 2 \pi } } } \end{array} +$$ + +From the KL constraint, we can derive a lower bound $\ell ( I _ { c } )$ and an upper bound ${ \cal U } ( I _ { c } )$ on $\sigma ^ { 2 }$ . + +$$ +\begin{array} { l } { { { \displaystyle { \frac { 1 } { 2 } } \left( K \sigma ^ { 2 } + \mu _ { E } ( { \bf x } ) ^ { T } \mu _ { E } ( { \bf x } ) - K - K \log \sigma ^ { 2 } \right) \le I _ { c } } } } \\ { { \displaystyle { \sigma ^ { 2 } - 1 - \log \sigma ^ { 2 } \le \frac { 2 I _ { c } } { K } } } } \\ { { \displaystyle { \log \sigma ^ { 2 } \ge - \frac { 2 I _ { c } } { K } - 1 } } } \\ { { \displaystyle { \sigma ^ { 2 } \ge \exp \left( - \frac { 2 I _ { c } } { K } - 1 \right) = \ell ( I _ { c } ) } } } \end{array} +$$ + +For the upper bound, since $\sigma ^ { 2 } - \log \sigma ^ { 2 } > { \textstyle { \frac { 1 } { 2 } } } \sigma ^ { 2 }$ , + +$$ +\begin{array} { l } { { \displaystyle { \sigma ^ { 2 } - 1 - \log \sigma ^ { 2 } \leq \frac { 2 I _ { c } } { K } } } } \\ { { \displaystyle { \frac { 1 } { 2 } \sigma ^ { 2 } - 1 < \frac { 2 I _ { c } } { K } } } } \\ { { \displaystyle { \sigma ^ { 2 } < \frac { 4 I _ { c } } { K } + 2 = \mathcal { U } ( I _ { c } ) } } } \end{array} +$$ + +Substituting $\ell ( I _ { c } )$ and ${ \cal U } ( I _ { c } )$ into Equation 14, we arrive at the following lower bound + +$$ +E ( \mu _ { E } ( g ( \mathbf { u } ) ) | \mathbf { x } ) > \exp \left( - 4 I _ { c } \exp \left( \frac { 2 I _ { c } } { K } + 1 \right) - \frac { K } { 2 } \log \left( \frac { 4 I _ { c } } { K } + 2 \right) - \frac { K } { 2 } \log 2 \pi \right) = C ( I _ { c } ) . +$$ + +# B GRADIENT PENALTY + +To combine VDB with gradient penalty, we use the reparameterization trick to backprop through the encoder when computing the gradient of the discriminator with respect to the inputs. + +$$ +\begin{array} { r l } { J ( D , E ) = \underset { D , E } { \operatorname* { m i n } } } & { \mathbb { E } _ { x \sim p ^ { * } ( \mathbf { x } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log \left( D ( \mathbf { z } ) \right) \right] \right] + \mathbb { E } _ { \mathbf { x } \sim G ( \mathbf { x } ) } \left[ \mathbb { E } _ { \mathbf { z } \sim E ( \mathbf { z } \mid \mathbf { x } ) } \left[ - \log \left( 1 - D ( \mathbf { z } ) \right) \right] \right] } \\ & { \quad + w _ { G P } \mathbb { E } _ { x \sim p ^ { * } ( \mathbf { x } ) } \left[ \mathbb { E } _ { \epsilon \sim \mathcal { N } ( 0 , I ) } \left[ \frac { 1 } { 2 } | | \nabla _ { x } D ( \mu _ { E } ( x ) + \Sigma _ { E } ( x ) \epsilon ) | | ^ { 2 } \right] \right] } \\ { \mathrm { s . t . } \quad } & { \mathbb { E } _ { \mathbf { x } \sim \tilde { p } ( \mathbf { x } ) } \left[ \mathrm { K L } \left[ E ( \mathbf { z } | \mathbf { x } ) | | r ( \mathbf { z } ) \right] \right] \leq I _ { c } , } \end{array} +$$ + +The coefficient $w _ { G P }$ weights the gradient penalty in the objective, $w _ { G P } = 1 0$ for the image generation, $w _ { G P } = 1$ for motion imitation, and $w _ { G P } = 0 . 1$ (C-maze) or $w _ { G P } = 0 . 0 1$ (S-maze) for the IRL tasks. The gradient penalty is applied only to real samples $p ^ { * } ( x )$ . We have experimented with apply the penalty to both real and fake samples, but found that performance was worse than penalizing only gradients from real samples. This is consistent with the GP implementation from Mescheder et al. (2018). + +# C IMITATION LEARNING + +Experimental Setup: The goal of the motion imitation tasks is to train a simulated agent to mimic a demonstration provided in the form of a mocap clip recorded from a human actor. We use a similar experimental setup as Peng et al. (2018), with a 34 degrees-of-freedom humanoid character. The state s consists of features that represent the configuration of the character’s body (link positions and velocities). We also include a phase variable $\phi \in [ 0 , 1 ]$ among the state features, which records the character’s progress along the motion and helps to synchronize the character with the reference motion. With 0 and 1 denoting the start and end of the motion respectively. The action a sampled from the policy $\pi ( \mathbf { a } | \mathbf { s } )$ specifies target poses for PD controller positioned at each joint. Given a state, the policy specifies a Gaussian distribution over the action space $\pi ( \mathbf { a } | \mathbf { s } ) = \mathcal { N } ( \mu ( \mathbf { s } ) , \Sigma )$ , with a state-dependent mean $\mu ( \mathbf { s } )$ and fixed diagonal covariance matrix $\Sigma$ . $\mu ( \mathbf { s } )$ is modeled using a 3- layered fully-connected network with 1024 and 512 hidden units, followed by a linear output layer that specifies the mean of the Gaussian. ReLU activations are used for all hidden layers. The value function is modeled with a similar architecture but with a single linear output unit. The policy is queried at $3 0 H z$ . Physics simulation is performed at $1 . 2 \mathrm { k H z }$ using the Bullet physics engine Bullet (2015). + +Given the rewards from the discriminator, PPO (Schulman et al., 2017) is used to train the policy, with a stepsize of $2 . 5 \times 1 0 ^ { - 6 }$ for the policy, a stepsize of 0.01 for the value function, and a stepsize of $1 0 ^ { - 5 }$ for the discirminator. Gradient descent with momentum 0.9 is used for all models. The PPO clipping threshold is set to 0.2. When evaluating the performance of the policies, each episode is simulated for a maximum horizon of $2 0 s$ . Early termination is triggered whenever the character’s torso contacts the ground, leaving the policy is a maximum error of $\pi$ radians for all remaining timesteps. + +Phase-Functioned Discriminator: Unlike the policy and value function, which are modeled with standard fully-connected networks, the discriminator is modeled by a phase-functioned neural network (PFNN) to explicitly model the time-dependency of the reference motion (Holden et al., 2017). While the parameters of a network are generally fixed, the parameters of a PFNN are functions of the phase variable $\phi$ . The parameters $\theta$ of the network for a given $\phi$ is determined by a weighted combination of a set of fixed parameters $\{ \theta _ { 0 } , \theta _ { 1 } , . . . , \theta _ { k } \}$ , + +$$ +\theta = \sum _ { i = 0 } ^ { k } w _ { i } ( \phi ) \theta _ { i } , +$$ + +where $w _ { i } ( \phi )$ is a phase-dependent weight for $\theta _ { i }$ . In our implementation, we use $k = 5$ sets of parameters and $w _ { i } ( \phi )$ is designed to linearly interpolate between two adjacent sets of parameters for each phase $\phi$ , where each set of parameters $\theta _ { i }$ corresponds to a discrete phase value $\phi _ { i }$ spaced + +![](images/d75d7a0543068769a72e9d9e205a9e3d3f0f65701de88a9b90fd8d4a628e0114.jpg) +Figure 10: Learning curves comparing VAIL to other methods for motion imitation. Performance is measured using the average joint rotation error between the simulated character and the reference motion. Each method is evaluated with 3 random seeds. + +![](images/5caec7daf65168a42ba692b0bb339931c433a0f09dde3fe83412da4879b5ec7a.jpg) +Figure 11: Learning curves comparing VAIL with a discriminator modeled by a phase-functioned neural network (PFNN), to modeling the discriminator with a fully-conneted network that receives the phase-variable $\phi$ as part of the input (no PFNN), and a discriminator modeled with a fullyconnected network but does not receive $\phi$ as an input (no phase). + +uniformly between $[ 0 , 1 ]$ . For a given value of $\phi$ , the parameters of the discriminator are determined according to + +$$ +\theta = w _ { i } ( \phi ) \theta _ { i } + w _ { i + 1 } ( \phi ) \theta _ { i + 1 } +$$ + +where $\theta _ { i }$ and $\theta _ { i + 1 }$ correspond to the phase values $\phi _ { i } ~ \le ~ \phi ~ < ~ \phi _ { i + 1 }$ that form the endpoints of the phase interval that contains $\phi$ . A PFNN is used for all motion imitation experiments, both VAIL and GAIL, except for those that use the approach proposed by Merel et al. (2017), which use standard fully-connected networks for the discriminator. Figure 11 compares the performance of VAIL when the discriminator is modeled with a phase-functioned neural network (with PFNN) to discriminators modeled with standard fully-connected networks. We increased the size of the layers of the fully-connected nets to have a similar number of parameters as a PFNN. We evaluate the performance of fully-connected nets that receive the phase variable $\phi$ as part of the input (no PFNN), and fully-connected nets that do not receive $\phi$ as an input. The phase-functioned discriminator leads to significant performance improvements across all tasks evaluated. Policies trained without a phase variable performs worst overall, suggesting that phase information is critical for performance. All methods perform well on simpler skills, such as running, but the additional phase structure introduced by the PFNN proved to be vital for successful imitation of more complex skills, such as the dance and backflip. + +Next we compare the accuracy of discriminators trained using different methods. Figure 12 illustrates accuracy of the discriminators over the course of training. Discriminators trained via GAIL quickly overpowers the policy, and learns to accurately differentiate between samples, even when instance noise is applied to the inputs. VAIL without the KL constraint slows the discriminator’s progress, but nonetheless reaches near perfect accuracy with a larger number of samples. Once the KL constraint is enforced, the information bottleneck constrains the performance of the discriminator, converging to approximately $8 0 \%$ accuracy. Figure 12 also visualizes the value of $\beta$ over the course of training for motion imitation tasks, along with the loss of the KL term in the objective. The dual gradient descent update effectively enforces the VDB constraint $I _ { c }$ . + +![](images/b6c41654bddeb136cfb4678e2198801a461d01e727e3636d2a6f1dc1cd9fd3ca.jpg) +Figure 12: Left: Accuracy of the discriminator trained using different methods for imitating the dance skill. Middle:. Value of the dual variable $\beta$ over the course of training. Right: KL loss over the course of training. The dual gradient descent update for $\beta$ effectively enforces the VDB constraint $I _ { c }$ . + +Video Imitation: In the video imitation tasks, we use a simplified 2D biped character in order to avoid issues that may arise due to depth ambiguity from monocular videos. The biped character has a total of 12 degrees-of-freedom, with similar state and action parameters as the humanoid. The video demonstrations are generated by rendering a reference motion into a sequence of video frames, which are then provided to the agent as a demonstration. The goal of the agent is to imitate the motion depicted in the video, without access to the original reference motion, and the reference motion is used only to evaluate performance. + +# D INVERSE REINFORCEMENT LEARNING + +# D.1 EXPERIMENTAL SETUP + +Environments We evaluate on two maze tasks, as illustrated in Figure 13. The C-maze is taken from Fu et al. (2017): in this maze, the agent starts at a random point within a small fixed distance of the mean start position. The agent has a continuous, 2D action space which allows it to accelerate in the $x$ or $y$ directions, and is able to observe its $x$ and $y$ position, but not its velocity. The ground truth reward is $r _ { t } = - d _ { t } - 1 0 ^ { - 3 } \| a _ { t } \| ^ { 2 }$ , where $d _ { t }$ is the agent’s distance to the goal, and $a _ { t }$ is its action (this action penalty is assumed to be zero in Figure 13). Episodes terminate after 100 steps; for evaluation, we report the undiscounted mean sum of rewards over each episode The S-maze is larger variant of the same environment with an extra wall between the agent and its goal. To make the S-maze easier to solve for the expert, we added further reward shaping to encourage the agent to pass between the gaps between walls. We also increased the maximum control forces relative to the C-maze to enable more rapid exploration. Environments will be released along with the rest of our VAIRL implementations. + +Hyperparameters Policy networks for all methods were two-layer ReLU MLPs with 32 hidden units per layer. Reward and discriminator networks were similar, but with 32-unit mean and standard deviation layers inserted before the final layer for VDB methods. To generate expert demonstrations, we trained a TRPO (Schulman et al., 2015) agent on the ground truth reward for the training environment for 200 iterations, and saved 107 trajectories from each of the policies corresponding to the five final iterations. TRPO used a batch size of 10,000, a step size of 0.01, and entropy bonus with a coefficient of 0.1 to increase diversity. After generating demonstrations, we trained the IRL and imitation methods on a training maze for 200 iterations; again, our policy optimizer was TRPO with the same hyperparameters used to generate demonstrations. Between each policy update, we did 100 discriminator updates using Adam with a learning rate of $5 \times 1 0 ^ { - 5 }$ and batch size of 32. For the C-maze our VAIRL runs used a target KL of $I _ { C } = 0 . 5$ , while for the more complex S-maze we use a tighter target of $I _ { C } = 0 . 0 5$ . For the test C-maze, we trained new policies against the recovered reward using TRPO with the hyperparameters described above; for the test S-maze, we modified these parameters to use a batch size of 50,000 and learning rate of 0.001 for 400 iterations. + +![](images/12bc128902971697948715d483d597b425c86c8befea48689d912e331c19ad9a.jpg) +Figure 13: Left: The C-maze used for training and its mirror version used for testing. Colour contours show the ground truth reward function that we use to train the expert and evaluate transfer quality, while the red and green dots show the initial and goal positions, respectively. Right: The analogous diagram for the S-maze. + +# D.2 RECOVERED REWARD FUNCTIONS + +Figure 14 and 15 show the reward functions recovered by each IRL baseline on the C-maze and S-maze, respectively, along with sample trajectories for policies trained to optimize those rewards. Notice that VAIRL tends to recover smoother reward functions that match the ground truth reward more closely than the baselines. Addition of a gradient penalty enhances this effect for both AIRL and VAIRL. This is especially true in S-maze, where combining a gradient penalty with a variational discriminator bottleneck leads to a smooth reward that gradually increases as the agent nears its goal position at the top of the maze. + +# E IMAGE GENERATION + +We provide further experiment on image generation and details of the experimental setup. + +# E.1 EXPERIMENTAL SETUP: + +We use the non-saturating objective of Goodfellow et al. (2014) for all models except WGANGP. Following (Lucic et al., 2017), we compute FID on samples of size $1 0 0 0 0 ^ { 2 }$ . We base our implementation on (Mescheder et al., 2018), where we do not use any batch normalization for both the generator and the discriminator. We use RMSprop (Hinton et al.) and a fixed learning rate for all experiments. + +For convolutional GAN, variational discriminative bottleneck is implemented as a 1x1 convolution on the final embedding space that outputs a Gaussian distribution over $Z$ parametrized with a mean and a diagonal covariance matrix. For all image experiments, we preserve the dimensionality of the latent space. All experiments use adaptive $\beta$ update with a dual stepsize of $\alpha _ { \beta } = 1 0 ^ { - 5 }$ . We will make our code public. Similarly to VGAN, instance noise Sønderby et al. (2016); Arjovsky & Bottou (2017) is added to the final embedding space of the discriminator right before applying the classifier. Instance noise can be interpreted as a non-adaptive VGAN without a information constraint. + +Architecture: For CIFAR-10, we use a resnet-based architecture adapted from (Mescheder et al., 2018) detailed in Tables 2, 3, and 4. For CelebA and CelebAHQ, we use the same architecture used in (Mescheder et al., 2018). + +![](images/7d3bc0d020f3fd296b0a917213f8ec69575561699ec2437043741ab56e1b2aef.jpg) +Figure 14: Visualizations of recovered reward functions transferred to the mirrored C-maze. Also shown are trajectories executed by policies trained to maximize the corresponding reward in the new environment. + +![](images/5caf8907963ae0367361848e6ba59de05031977dd75a83acfbebdb3e3a78005c.jpg) +Figure 15: Visualizations of recovered reward functions transferred to the mirrored S-maze, like Figure 14. + +Table 2: CIFAR-10 Generator + +
LayerOutput sizeFilter
FCReshape256·4·4256×4×4256→256·4·4
Resnet-blockUpsample128×4×4128×8×8256→128
Resnet-blockUpsample64×8×864 × 16 × 16128→64
Resnet-blockUpsample32 ×16×1632× 32×3264→32
Resnet-blockConv2D32×32×323× 32× 3232→32
+ +Table 3: CIFAR-10 Discriminator + +
LayerOutput sizeFilter
Conv2D32 × 32 × 323→32
Resnet-blockAvgPool2D64×32×3264 ×16 ×1632→64
Resnet-blockAvgPool2D128×16×16128×8×864→128
Resnet-blockAvgPool2D256×8×8256×4×4128→256
FC1256·4·4→1
+ +# E.2 RESULTS + +CIFAR-10: We compare our approach with recent stabilization techniques: WGAN-GP (Gulrajani et al., 2017b), instance noise (Sønderby et al., 2016; Arjovsky & Bottou, 2017), spectral normalization (Miyato et al., 2018), and gradient penalty (Mescheder et al., 2018). We train report the networks at $7 5 0 \mathrm { k }$ iterations. We use $I _ { c } = 0 . 1$ , and a coefficient of $w _ { G P } = 1 0$ for the gradient penalty, which is the same as the value used by the implementation from Mescheder et al. (2018). See Figure 16 for visual comparisons of randomly generated samples. + +CelebA: On the CelebA (Liu et al., 2015) dataset, we generate images of size $1 2 8 \times 1 2 8$ with $I _ { c } = 0 . 2$ . On this dataset we do not see a big improvement upon the other baselines. This is likely because the architecture has been effectively tuned for this task, reflected by the fact that even the vanilla GAN trains fine on this dataset. All GAN, GP, and VGAN-GP obtain a similar FID scores of 7.64, 7.76, 7.25 respectively. See Figure 17 for more qualitative results with our approach. + +CelebAHQ: VGAN can also be trained on on CelebAHQ Karras et al. (2018) at 1024 by 1024 resolution directly, without progressive growing (Karras et al., 2018). We use $I _ { c } = 0 . 1$ and train with VGAN-GP. We train on a single Tesla V100, which fits a batch size of 8 in our experiments. Previous approaches (Karras et al., 2018; Mescheder et al., 2018) use a larger batch size and train over multiple GPUs. The model was trained for $3 0 0 \mathrm { k }$ iterations. + +Table 4: CIFAR-10 Discriminator with VDB + +
LayerOutput sizeFilter
Conv2D32 ×32×323→32
Resnet-blockAvgPool2D64×32×3264×16×1632→64
Resnet-blockAvgPool2D128×16×16128×8×864→128
Resnet-blockAvgPool2D256×8×8256×4×4128→256
1×1Conv2D2:256×4×4256→2:256
Sampling256×4×4
FC1256·4·4→1
+ +![](images/093328ea8485a78bfbb984c256407e8d540314cb0606b17307debb5f2f4316cc.jpg) +Figure 16: Random results on CIFAR-10 (Krizhevsky et al.): GAN (Goodfellow et al., 2014) FID: 63.6, instance noise (Sønderby et al., 2016; Arjovsky & Bottou, 2017) FID: 30.7, spectral normalization (SN) (Miyato et al., 2018) FID: 23.9, gradient penalty (GP) (Mescheder et al., 2018) FID: 22.6, WGAN-GP Gulrajani et al. (2017b) FID: 19.9, and the proposed VGAN-GP FID: 18.1. The samples produced by VGAN-GP (right) look the most realistic where objects like vehicles may be discerned. + +![](images/0f4c1610d1c621991c4b65e2d319bf2da62a7f55619f72224c958e5aeb05677f.jpg) +Figure 17: Random VGAN samples on CelebA $1 2 8 \times 1 2 8$ at $3 0 0 \mathrm { k }$ iterations. + +![](images/82b55f54f72b88903dca2d47813f7ee3a93f22bbf756b31c3c5ed8a68f59a2c8.jpg) +Figure 18: VGAN samples on CelebA HQ (Karras et al., 2018) $1 0 2 4 \times 1 0 2 4$ resolution at $3 0 0 \mathrm { k }$ iterations. Models are trained from scratch at full resolution, without the progressive scheme proposed by Karras et al. (2017). \ No newline at end of file diff --git a/parse/train/HyxPx3R9tm/HyxPx3R9tm_content_list.json b/parse/train/HyxPx3R9tm/HyxPx3R9tm_content_list.json new file mode 100644 index 0000000000000000000000000000000000000000..136c46ee5282beb78be0d1431ee97ad045541b52 --- /dev/null +++ b/parse/train/HyxPx3R9tm/HyxPx3R9tm_content_list.json @@ -0,0 +1,2644 @@ +[ + { + "type": "text", + "text": "VARIATIONAL DISCRIMINATOR BOTTLENECK: IMPROVING IMITATION LEARNING, INVERSE RL, AND GANS BY CONSTRAINING INFORMATION FLOW ", + "text_level": 1, + "bbox": [ + 174, + 98, + 823, + 171 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Xue Bin Peng & Angjoo Kanazawa & Sam Toyer & Pieter Abbeel & Sergey Levine ", + "bbox": [ + 184, + 194, + 761, + 209 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "University of California, Berkeley {xbpeng,kanazawa,sdt,pabbeel,svlevine}@berkeley.edu ", + "bbox": [ + 186, + 210, + 686, + 237 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "ABSTRACT ", + "text_level": 1, + "bbox": [ + 454, + 273, + 544, + 289 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Adversarial learning methods have been proposed for a wide range of applications, but the training of adversarial models can be notoriously unstable. Effectively balancing the performance of the generator and discriminator is critical, since a discriminator that achieves very high accuracy will produce relatively uninformative gradients. In this work, we propose a simple and general technique to constrain information flow in the discriminator by means of an information bottleneck. By enforcing a constraint on the mutual information between the observations and the discriminator’s internal representation, we can effectively modulate the discriminator’s accuracy and maintain useful and informative gradients. We demonstrate that our proposed variational discriminator bottleneck (VDB) leads to significant improvements across three distinct application areas for adversarial learning algorithms. Our primary evaluation studies the applicability of the VDB to imitation learning of dynamic continuous control skills, such as running. We show that our method can learn such skills directly from raw video demonstrations, substantially outperforming prior adversarial imitation learning methods. The VDB can also be combined with adversarial inverse reinforcement learning to learn parsimonious reward functions that can be transferred and re-optimized in new settings. Finally, we demonstrate that VDB can train GANs more effectively for image generation, improving upon a number of prior stabilization methods. (Video1) ", + "bbox": [ + 233, + 305, + 764, + 568 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "1 INTRODUCTION ", + "text_level": 1, + "bbox": [ + 176, + 597, + 336, + 612 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Adversarial learning methods provide a promising approach to modeling distributions over highdimensional data with complex internal correlation structures. These methods generally use a discriminator to supervise the training of a generator in order to produce samples that are indistinguishable from the data. A particular instantiation is generative adversarial networks, which can be used for high-fidelity generation of images (Goodfellow et al., 2014; Karras et al., 2017) and other highdimensional data (Vondrick et al., 2016; Xie et al., 2018; Donahue et al., 2018). Adversarial methods can also be used to learn reward functions in the framework of inverse reinforcement learning (Finn et al., 2016a; Fu et al., 2017), or to directly imitate demonstrations (Ho & Ermon, 2016). However, they suffer from major optimization challenges, one of which is balancing the performance of the generator and discriminator. A discriminator that achieves very high accuracy can produce relatively uninformative gradients, but a weak discriminator can also hamper the generator’s ability to learn. These challenges have led to widespread interest in a variety of stabilization methods for adversarial learning algorithms (Arjovsky et al., 2017; Kodali et al., 2017; Berthelot et al., 2017). ", + "bbox": [ + 174, + 628, + 825, + 808 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "In this work, we propose a simple regularization technique for adversarial learning, which constrains the information flow from the inputs to the discriminator using a variational approximation to the information bottleneck. By enforcing a constraint on the mutual information between the input observations and the discriminator’s internal representation, we can encourage the discriminator to learn a representation that has heavy overlap between the data and the generator’s distribution, thereby effectively modulating the discriminator’s accuracy and maintaining useful and informative gradients for the generator. Our approach to stabilizing adversarial learning can be viewed as an adaptive variant of instance noise (Salimans et al., 2016; Sønderby et al., 2016; Arjovsky & Bottou, 2017). However, we show that the adaptive nature of this method is critical. Constraining the mutual information between the discriminator’s internal representation and the input allows the regularizer to directly limit the discriminator’s accuracy, which automates the choice of noise magnitude and applies this noise to a compressed representation of the input that is specifically optimized to model the most discerning differences between the generator and data distributions. ", + "bbox": [ + 174, + 815, + 825, + 898 + ], + "page_idx": 0 + }, + { + "type": "image", + "img_path": "images/79dae658a21f3a99bd5d512bd39e4ed96a241605dc27ac431de015f01936586c.jpg", + "image_caption": [ + "Figure 1: Our method is general and can be applied to a broad range of adversarial learning tasks. Left: Motion imitation with adversarial imitation learning. Middle: Image generation. Right: Learning transferable reward functions through adversarial inverse reinforcement learning. " + ], + "image_footnote": [], + "bbox": [ + 176, + 108, + 820, + 174 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 243, + 825, + 342 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "The main contribution of this work is the variational discriminator bottleneck (VDB), an adaptive stochastic regularization method for adversarial learning that substantially improves performance across a range of different application domains, examples of which are available in Figure 1. Our method can be easily applied to a variety of tasks and architectures. First, we evaluate our method on a suite of challenging imitation tasks, including learning highly acrobatic skills from mocap data with a simulated humanoid character. Our method also enables characters to learn dynamic continuous control skills directly from raw video demonstrations, and drastically improves upon previous work that uses adversarial imitation learning. We further evaluate the effectiveness of the technique for inverse reinforcement learning, which recovers a reward function from demonstrations in order to train future policies. Finally, we apply our framework to image generation using generative adversarial networks, where employing VDB improves the performance in many cases. ", + "bbox": [ + 174, + 348, + 825, + 502 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "2 RELATED WORK ", + "text_level": 1, + "bbox": [ + 176, + 523, + 344, + 539 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Recent years have seen an explosion of adversarial learning techniques, spurred by the success of generative adversarial networks (GANs) (Goodfellow et al., 2014). A GAN framework is commonly composed of a discriminator and a generator, where the discriminator’s objective is to classify samples as real or fake, while the generator’s objective is to produce samples that fool the discriminator. Similar frameworks have also been proposed for inverse reinforcement learning (IRL) (Finn et al., 2016b) and imitation learning (Ho & Ermon, 2016). The training of adversarial models can be extremely unstable, with one of the most prevalent challenges being balancing the interplay between the discriminator and the generator (Berthelot et al., 2017). The discriminator can often overpower the generator, easily differentiating between real and fake samples, thus providing the generator with uninformative gradients for improvement (Che et al., 2016). Alternative loss functions have been proposed to mitigate this problem (Mao et al., 2016; Zhao et al., 2016; Arjovsky et al., 2017). Regularizers have been incorporated to improve stability and convergence, such as gradient penalties (Kodali et al., 2017; Gulrajani et al., 2017a; Mescheder et al., 2018), reconstruction loss (Che et al., 2016), and a myriad of other heuristics (Sønderby et al., 2016; Salimans et al., 2016; Arjovsky & Bottou, 2017; Berthelot et al., 2017). Task-specific architectural designs can also substantially improve performance (Radford et al., 2015; Karras et al., 2017). Similarly, our method also aims to regularize the discriminator in order to improve the feedback provided to the generator. But instead of explicit regularization of gradients or architecture-specific constraints, we apply a general information bottleneck to the discriminator, which previous works have shown to encourage networks to ignore irrelevant cues (Achille & Soatto, 2017). We hypothesize that this then allows the generator to focus on improving the most discerning differences between real and fake samples. ", + "bbox": [ + 174, + 555, + 825, + 847 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Adversarial techniques have also been applied to inverse reinforcement learning (Fu et al., 2017), where a reward function is recovered from demonstrations, which can then be used to train policies to reproduce a desired skill. Finn et al. (2016a) showed an equivalence between maximum entropy IRL and GANs. Similar techniques have been developed for adversarial imitation learning (Ho & Ermon, 2016; Merel et al., 2017), where agents learn to imitate demonstrations without explicitly recovering a reward function. One advantage of adversarial methods is that by leveraging a discriminator in place of a reward function, they can be applied to imitate skills where reward functions can be difficult to engineer. However, the performance of policies trained through adversarial methods still falls short of those produced by manually designed reward functions, when such reward functions are available (Rajeswaran et al., 2017; Peng et al., 2018). We show that our method can significantly improve upon previous works that use adversarial techniques, and produces results of comparable quality to those from state-of-the-art approaches that utilize manually engineered reward functions. ", + "bbox": [ + 176, + 854, + 823, + 924 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 825, + 202 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Our variational discriminator bottleneck is based on the information bottleneck (Tishby & Zaslavsky, 2015), a technique for regularizing internal representations to minimize the mutual information with the input. Intuitively, a compressed representation can improve generalization by ignoring irrelevant distractors present in the original input. The information bottleneck can be instantiated in practical deep models by leveraging a variational bound and the reparameterization trick, inspired by a similar approach in variational autoencoders (VAE) (Kingma & Welling, 2013). The resulting variational information bottleneck approximates this compression effect in deep networks (Alemi et al., 2016; Achille & Soatto, 2017). A similar bottleneck has also been applied to learn disentangled representations (Higgins et al., 2017). Building on the success of VAEs and GANs, a number of efforts have been made to combine the two. Makhzani et al. (2016) used adversarial discriminators during the training of VAEs to encourage the marginal distribution of the latent encoding to be similar to the prior distribution, similar techniques include Mescheder et al. (2017) and Chen et al. (2018). Conversely, Larsen et al. (2016) modeled the generator of a GAN using a VAE. Zhao et al. (2016) used an autoencoder instead of a VAE to model the discriminator, but does not enforce an information bottleneck on the encoding. While instance noise is widely used in modern architectures (Salimans et al., 2016; Sønderby et al., 2016; Arjovsky & Bottou, 2017), we show that explicitly enforcing an information bottleneck leads to improved performance over simply adding noise for a variety of applications. ", + "bbox": [ + 174, + 208, + 825, + 458 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "3 PRELIMINARIES ", + "text_level": 1, + "bbox": [ + 176, + 478, + 339, + 493 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "In this section, we provide a review of the variational information bottleneck proposed by Alemi et al. (2016) in the context of supervised learning. Our variational discriminator bottleneck is based on the same principle, and can be instantiated in the context of GANs, inverse RL, and imitation learning. Given a dataset $\\left\\{ \\mathbf { x } _ { i } , \\mathbf { y } _ { i } \\right\\}$ , with features $\\mathbf { x } _ { i }$ and labels $\\mathbf { y } _ { i }$ , the standard maximum likelihood estimate $q ( \\mathbf { y } _ { i } | \\mathbf { x } _ { i } )$ can be determined according to ", + "bbox": [ + 173, + 507, + 825, + 579 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/c35092374e07c47b5339c649b21f87d8f7ac11e0b2320e9cc1e9905bf0f41781.jpg", + "text": "$$\n\\operatorname* { m i n } _ { \\boldsymbol { q } } \\quad \\mathbb { E } _ { \\mathbf { x } , \\mathbf { y } \\sim p ( \\mathbf { x } , \\mathbf { y } ) } \\left[ - \\log q ( \\mathbf { y } | \\mathbf { x } ) \\right] .\n$$", + "text_format": "latex", + "bbox": [ + 383, + 583, + 611, + 606 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Unfortunately, this estimate is prone to overfitting, and the resulting model can often exploit idiosyncrasies in the data (Krizhevsky et al., 2012; Srivastava et al., 2014). Alemi et al. (2016) proposed regularizing the model using an information bottleneck to encourage the model to focus only on the most discriminative features. The bottleneck can be incorporated by first introducing an encoder $E ( { \\bf z } | { \\bf x } )$ that maps the features $\\mathbf { x }$ to a latent distribution over $Z$ , and then enforcing an upper bound $I _ { c }$ on the mutual information between the encoding and the original features $I ( X , Z )$ . This results in the following regularized objective $J ( \\boldsymbol { q } , E )$ ", + "bbox": [ + 173, + 609, + 825, + 708 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/daf21da9d227bc90791e3802553cb98a22b6ab9ca2b5b16d7ce7c8d999087ade.jpg", + "text": "$$\n\\begin{array} { r l } { J ( q , E ) = \\underset { q , E } { \\mathrm { m i n } } } & { \\mathbb { E } _ { \\mathbf { x } , \\mathbf { y } \\sim p ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log q ( \\mathbf { y } \\vert \\mathbf { z } ) \\right] \\right] } \\\\ { \\mathrm { s . t . } } & { I ( X , Z ) \\le I _ { c } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 308, + 712, + 686, + 757 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Note that the model $q ( \\mathbf { y } \\vert \\mathbf { z } )$ now maps samples from the latent distribution $\\mathbf { z }$ to the label $\\mathbf { y }$ . The mutual information is defined according to ", + "bbox": [ + 171, + 761, + 826, + 789 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/0a1fdd9ca28ceec311c7ba0c33f867e014c7c9208387851db3bbe832526aced6.jpg", + "text": "$$\nI ( X , Z ) = \\int p ( \\mathbf { x } , \\mathbf { z } ) \\log { \\frac { p ( \\mathbf { x } , \\mathbf { z } ) } { p ( \\mathbf { x } ) p ( \\mathbf { z } ) } } \\ d \\mathbf { x } \\ d \\mathbf { z } \\ = \\int p ( \\mathbf { x } ) E ( \\mathbf { z } | \\mathbf { x } ) \\log { \\frac { E ( \\mathbf { z } | \\mathbf { x } ) } { p ( \\mathbf { z } ) } } \\ d \\mathbf { x } \\ d \\mathbf { z } \\ ,\n$$", + "text_format": "latex", + "bbox": [ + 232, + 792, + 763, + 827 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "where $p ( \\mathbf { x } )$ is the distribution given by the dataset. Computing the marginal distribution $\\begin{array} { r } { p ( \\mathbf { z } ) = \\int E ( \\mathbf { z } | \\mathbf { x } ) p ( \\mathbf { x } ) d \\mathbf { x } } \\end{array}$ can be challenging. Instead, a variational lower bound can be obtained by using an approximation $r ( \\mathbf { z } )$ of the marginal. Since KL $[ p ( \\mathbf { z } ) | | r ( \\mathbf { z } ) ] \\geq 0$ , $\\begin{array} { r } { \\int p ( \\mathbf { z } ) \\log p ( \\mathbf { z } ) d \\mathbf { z } \\geq } \\end{array}$ $\\begin{array} { r } { \\int p ( \\mathbf { z } ) \\log r ( \\mathbf { z } ) d \\mathbf { z } } \\end{array}$ , an upper bound on $I ( X , Z )$ can be obtained via the KL divergence, ", + "bbox": [ + 173, + 830, + 823, + 890 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/12fad4fb6a8825ffd890e282a3c46df8e5d4557525bcfcee76adad3a8b19cafb.jpg", + "text": "$$\nI ( X , Z ) \\leq \\int p ( \\mathbf { x } ) E ( \\mathbf { z } | \\mathbf { x } ) \\log { \\frac { E ( \\mathbf { z } | \\mathbf { x } ) } { r ( \\mathbf { z } ) } } d \\mathbf { x } d \\mathbf { z } = \\mathbb { E } _ { \\mathbf { x } \\sim p ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] \\right] .\n$$", + "text_format": "latex", + "bbox": [ + 241, + 895, + 754, + 928 + ], + "page_idx": 2 + }, + { + "type": "image", + "img_path": "images/b3e8e858d6dcdf4c97bb70738e3b1c011f0ac9d11f19000401897e1000d8ecdd.jpg", + "image_caption": [ + "Figure 2: Left: Overview of the variational discriminator bottleneck. The encoder first maps samples $\\mathbf { x }$ to a latent distribution $E ( { \\bf z } | { \\bf x } )$ . The discriminator is then trained to classify samples $\\mathbf { z }$ from the latent distribution. An information bottleneck $I ( X , Z ) \\leq I _ { c }$ is applied to $Z$ . Right: Visualization of discriminators trained to differentiate two Gaussians with different KL bounds $I _ { c }$ . " + ], + "image_footnote": [], + "bbox": [ + 171, + 106, + 821, + 224 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "This provides an upper bound on the regularized objective $\\tilde { J } ( q , E ) \\ge J ( q , E )$ , ", + "bbox": [ + 174, + 305, + 689, + 323 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/9c23543648dcd909d9d5acee574438c02512e3a2ce6d69be5b575d00c347424d.jpg", + "text": "$$\n\\begin{array} { r l } { \\tilde { J } ( q , E ) = \\underset { q , E } { \\mathrm { m i n } } } & { \\mathbb { E } _ { \\mathbf { x } , \\mathbf { y } \\sim p ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log q ( \\mathbf { y } \\vert \\mathbf { z } ) \\right] \\right] } \\\\ { \\mathrm { s . t . } } & { \\mathbb { E } _ { \\mathbf { x } \\sim p ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } \\vert \\mathbf { x } ) \\vert \\vert r ( \\mathbf { z } ) \\right] \\right] \\leq I _ { c } . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 308, + 329, + 687, + 376 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "To solve this problem, the constraint can be subsumed into the objective with a coefficient $\\beta$ ", + "bbox": [ + 173, + 381, + 776, + 396 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/15ea1145c83c272eecce462d602a246ee796dcb5ce5a86fb2e5d3ca6ec62d439.jpg", + "text": "$$\n\\begin{array} { r l } { \\underset { \\boldsymbol { q } , E } { \\mathop { \\operatorname* { m i n } } } } & { \\mathbb { E } _ { \\mathbf { x } , \\mathbf { y } \\sim p ( \\mathbf { x } , \\mathbf { y } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } | \\mathbf { x } ) } \\left[ - \\log q ( \\mathbf { y } | \\mathbf { z } ) \\right] \\right] + \\beta \\left( \\mathbb { E } _ { \\mathbf { x } \\sim p ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] \\right] - I _ { c } \\right) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 191, + 401, + 767, + 429 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Alemi et al. (2016) evaluated the method on supervised learning tasks, and showed that models trained with a VIB can be less prone to overfitting and more robust to adversarial examples. ", + "bbox": [ + 174, + 434, + 826, + 463 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "4 VARIATIONAL DISCRIMINATOR BOTTLENECK ", + "text_level": 1, + "bbox": [ + 173, + 482, + 584, + 500 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "To outline our method, we first consider a standard GAN framework consisting of a discriminator $D$ and a generator $G$ , where the goal of the discriminator is to distinguish between samples from the target distribution $p ^ { * } ( \\mathbf { x } )$ and samples from the generator $G ( \\mathbf { x } )$ , ", + "bbox": [ + 173, + 513, + 825, + 556 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/63070983082946d2ca56d62ce9909667449893030fdc339a89e924cd674c564e.jpg", + "text": "$$\n\\begin{array} { r l } { \\underset { G } { \\mathop { \\operatorname* { m a x } } } \\underset { D } { \\mathop { \\operatorname* { m i n } } } } & { \\mathbb { E } _ { \\mathbf { x } \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ - \\log \\left( D ( \\mathbf { x } ) \\right) \\right] + \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { x } ) \\right) \\right] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 271, + 563, + 723, + 585 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "We incorporate a variational information bottleneck by introducing an encoder $E$ into the discriminator that maps a sample $\\mathbf { x }$ to a stochastic encoding $\\mathbf { z } \\sim E ( \\mathbf { z } | \\mathbf { x } )$ , and then apply a constraint $I _ { c }$ on the mutual information $I ( X , Z )$ between the original features and the encoding. $D$ is then trained to classify samples drawn from the encoder distribution. A schematic illustration of the framework is available in Figure 2. The regularized objective $J ( D , E )$ for the discriminator is given by ", + "bbox": [ + 173, + 592, + 825, + 662 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/db89319b4bc15a32f1fab3822a2aa5b17a7b0f55c0751a48c8d38dcd7f3a6830.jpg", + "text": "$$\n\\begin{array} { r l } { J ( D , E ) = \\underset { D , E } { \\operatorname* { m i n } } } & { \\mathbb { E } _ { x \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( D ( \\mathbf { z } ) \\right) \\right] \\right] + \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { z } ) \\right) \\right] \\right] } \\\\ { \\mathrm { s . t . } } & { \\mathbb { E } _ { \\mathbf { x } \\sim \\tilde { p } ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] \\right] \\leq I _ { c } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 667, + 823, + 717 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "with $\\tilde { p } = { \\textstyle \\frac { 1 } { 2 } } p ^ { * } + { \\textstyle \\frac { 1 } { 2 } } G$ being a mixture of the target distribution and the generator. We refer to this regularizer as the variational discriminator bottleneck (VDB). To optimize this objective, we can introduce a Lagrange multiplier $\\beta$ , ", + "bbox": [ + 173, + 724, + 828, + 767 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/eb65b738aa94bd99ca054e87305cfe57688708a95faf9ae973ab09523f5bc5f7.jpg", + "text": "$$\n\\begin{array} { r l } { I ( D , E ) = \\underset { D , E } { \\mathrm { m i n } } \\underset { \\beta \\geq 0 } { \\mathrm { m a x } } } & { \\mathbb { E } _ { \\mathbf { x } \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( D ( \\mathbf { z } ) \\right) \\right] \\right] + \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { z } ) \\right) \\right] \\right. } \\\\ & { \\left. + \\beta \\left( \\mathbb { E } _ { \\mathbf { x } \\sim \\tilde { p } ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) \\right| | r ( \\mathbf { z } ) \\right] \\right] - I _ { c } \\right) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 773, + 839, + 823 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "As we will discuss in Section 4.1 and demonstrate in our experiments, enforcing a specific mutual information budget between $\\mathbf { x }$ and $\\mathbf { z }$ is critical for good performance. We therefore adaptively update $\\beta$ via dual gradient descent to enforce a specific constraint $I _ { c }$ on the mutual information, ", + "bbox": [ + 173, + 830, + 826, + 875 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/650053f9a97b44e3befcb882cd671026acf37c946b18cf2f9f2a9cbdd4c1572d.jpg", + "text": "$$\n\\begin{array} { r l } & { D , E \\gets \\arg \\operatorname* { m i n } _ { D , E } \\mathcal { L } ( D , E , \\beta ) } \\\\ & { \\beta \\gets \\operatorname* { m a x } \\big ( 0 , \\beta + \\alpha _ { \\beta } \\big ( \\mathbb { E } _ { \\mathbf { x } \\sim \\tilde { p } ( \\mathbf { x } ) } [ \\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) ] ] - I _ { c } \\big ) \\big ) , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 295, + 878, + 700, + 930 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where $\\mathcal { L } ( D , E , \\beta )$ is the Lagrangian ", + "bbox": [ + 174, + 103, + 413, + 118 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/20442874cb2d597205f42421c59f456328a8aca175fc6b5a895c7350d9281851.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathcal { L } ( D , E , \\beta ) = \\mathbb { E } _ { \\mathbf { x } \\sim p ^ { * } ( \\mathbf { x } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } | \\mathbf { x } ) } [ - \\log ( D ( \\mathbf { z } ) ) ] ] + \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } | \\mathbf { x } ) } [ - \\log ( 1 - D ( \\mathbf { z } ) ) ] ] } \\\\ & { \\quad \\quad \\quad \\quad + \\beta ( \\mathbb { E } _ { \\mathbf { x } \\sim \\hat { p } ( \\mathbf { x } ) } [ \\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) ] ] - I _ { c } ) , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 184, + 119, + 810, + 161 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "and $\\alpha _ { \\beta }$ is the stepsize for the dual variable in dual gradient descent (Boyd & Vandenberghe, 2004). In practice, we perform only one gradient step on $D$ and $E$ , followed by an update to $\\beta$ . We refer to a GAN that incorporates a VDB as a variational generative adversarial network (VGAN). ", + "bbox": [ + 176, + 171, + 823, + 213 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "In our experiments, the prior $r ( \\mathbf { z } ) = \\mathcal { N } ( 0 , I )$ is modeled with a standard Gaussian. The encoder $E ( \\mathbf { z } | \\mathbf { x } ) \\overset { - } { = } \\mathcal { N } ( \\mu _ { E } ( \\mathbf { x } ) , \\boldsymbol { \\Sigma } _ { E } ^ { - } ( \\mathbf { x } ) )$ models a Gaussian distribution in the latent variables $Z$ , with mean $\\mu _ { E } ( { \\bf x } )$ and diagonal covariance matrix $\\Sigma _ { E } ( { \\bf x } )$ . When computing the KL loss, each batch of data contains an equal number of samples from $p ^ { * } ( x )$ and $G ( x )$ . We use a simplified objective for the generator, ", + "bbox": [ + 173, + 219, + 825, + 289 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/2bfba94734b6a85956690d320667be3bf967e2f2b464ce3cab214aa98f5d8340.jpg", + "text": "$$\n\\operatorname* { m a x } _ { G } ~ \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ - \\log \\left( 1 - D ( \\mu _ { E } ( \\mathbf { x } ) ) \\right) \\right] .\n$$", + "text_format": "latex", + "bbox": [ + 352, + 287, + 627, + 310 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "where the $\\mathrm { K L }$ penalty is excluded from the generator’s objective. Instead of computing the expectation over $Z$ , we found that approximating the expectation by evaluating $D$ at the mean $\\mu _ { E } ( { \\bf x } )$ of the encoder’s distribution was sufficient for our tasks. The discriminator is modeled with a single linear unit followed by a sigmoid $D ( \\mathbf { z } ) = \\sigma ( \\mathbf { w } _ { D } ^ { T } \\mathbf { z } + \\mathbf { b } _ { D } )$ , with weights $\\mathbf { w } _ { D }$ and bias $\\mathbf { b } _ { D }$ . ", + "bbox": [ + 174, + 311, + 825, + 367 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "4.1 DISCUSSION AND ANALYSIS ", + "text_level": 1, + "bbox": [ + 176, + 383, + 411, + 397 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "To interpret the effects of the VDB, we consider the results presented by Arjovsky & Bottou (2017), which show that for two distributions with disjoint support, the optimal discriminator can perfectly classify all samples and its gradients will be zero almost everywhere. Thus, as the discriminator converges to the optimum, the gradients for the generator vanishes accordingly. To address this issue, Arjovsky & Bottou (2017) proposed applying continuous noise to the discriminator inputs, thereby ensuring that the distributions have continuous support everywhere. In practice, if the original distributions are sufficiently distant from each other, the added noise will have negligible effects. As shown by Mescheder et al. (2017), the optimal choice for the variance of the noise to ensure convergence can be quite delicate. In our method, by first using a learned encoder to map the inputs to an embedding and then applying an information bottleneck on the embedding, we can dynamically adjust the variance of the noise such that the distributions not only share support in the embedding space, but also have significant overlap. Since the minimum amount of information required for binary classification is 1 bit, by selecting an information constraint $I _ { c } < 1 $ , the discriminator is prevented from from perfectly differentiating between the distributions. To illustrate the effects of the VDB, we consider a simple task of training a discriminator to differentiate between two Gaussian distributions. Figure 2 visualizes the decision boundaries learned with different bounds $I _ { c }$ on the mutual information. Without a VDB, the discriminator learns a sharp decision boundary, resulting in vanishing gradients for much of the space. But as $I _ { c }$ decreases and the bound tightens, the decision boundary is smoothed, providing more informative gradients that can be leveraged by the generator. ", + "bbox": [ + 173, + 409, + 825, + 672 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Taking this analysis further, we can extend Theorem 3.2 from Arjovsky & Bottou (2017) to analyze the VDB, and show that the gradient of the generator will be non-degenerate for a small enough constraint $I _ { c }$ , under some additional simplifying assumptions. The result in Arjovsky & Bottou (2017) states that the gradient consists of vectors that point toward samples on the data manifold, multiplied by coefficients that depend on the noise. However, these coefficients may be arbitrarily small if the generated samples are far from real samples, and the noise is not large enough. This can still cause the generator gradient to vanish. In the case of the VDB, the constraint ensures that these coefficients are always bounded below. Due to space constraints, this result is presented in Appendix A. ", + "bbox": [ + 173, + 679, + 825, + 805 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "4.2 VAIL: VARIATIONAL ADVERSARIAL IMITATION LEARNING ", + "text_level": 1, + "bbox": [ + 174, + 820, + 625, + 835 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "To extend the VDB to imitation learning, we start with the generative adversarial imitation learning (GAIL) framework (Ho & Ermon, 2016), where the discriminator’s objective is to differentiate between the state distribution induced by a target policy $\\pi ^ { * } ( \\mathbf { s } )$ and the state distribution of the agent’s policy $\\pi ( \\mathbf { s } )$ , ", + "bbox": [ + 174, + 847, + 825, + 904 + ], + "page_idx": 4 + }, + { + "type": "equation", + "img_path": "images/fee895b2e56214553f95a0fc70340c18a66373dca51679b1e745aba34bcc7d4f.jpg", + "text": "$$\n\\operatorname* { m a x } _ { \\pi } \\operatorname* { m i n } _ { D } \\quad \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ^ { * } ( \\mathbf { s } ) } \\left[ - \\log \\left( D ( \\mathbf { s } ) \\right) \\right] + \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { s } ) \\right) \\right] .\n$$", + "text_format": "latex", + "bbox": [ + 277, + 905, + 717, + 928 + ], + "page_idx": 4 + }, + { + "type": "image", + "img_path": "images/30d57dddd51de39696f83d45f9cb8ba9fe5f6258906497db5bb38f50fa1a90ca.jpg", + "image_caption": [ + "Figure 3: Simulated humanoid performing various skills. VAIL is able to closely imitate a broad range of skills from mocap data. " + ], + "image_footnote": [], + "bbox": [ + 178, + 107, + 820, + 253 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The discriminator is trained to maximize the likelihood assigned to states from the target policy, while minimizing the likelihood assigned to states from the agent’s policy. The discriminator also serves as the reward function for the agent, which encourages the policy to visit states that, to the discriminator, appear indistinguishable from the demonstrations. Similar to the GAN framework, we can incorporate a VDB into the discriminator, ", + "bbox": [ + 173, + 305, + 826, + 376 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/7a608c25030359564f767e572f40eab5f02e5e0786cfa5078532a61af3ce54d6.jpg", + "text": "$$\n\\begin{array} { r l } & { I ( D , E ) = \\underset { D , E } { \\mathrm { m i n } } \\underset { \\beta \\geq 0 } { \\mathrm { m a x } } \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ^ { * } ( \\mathbf { s } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } ) } [ - \\log ( D ( \\mathbf { z } ) ) ] ] + \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } ) } [ - \\log ( 1 - D ( \\mathbf { z } ) ) ] ] } \\\\ & { \\qquad + \\beta ( \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } [ \\mathrm { K L } [ E ( \\mathbf { z } \\mid \\mathbf { s } ) ] \\mid \\mid r ( \\mathbf { z } ) ] ] - I _ { c } ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 382, + 833, + 431 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "where $\\tilde { \\pi } = { \\textstyle \\frac { 1 } { 2 } } \\pi ^ { * } + { \\textstyle \\frac { 1 } { 2 } } \\pi$ represents a mixture of the target policy and the agent’s policy. The reward for $\\pi$ is then specified by the discriminator $r _ { t } = - \\mathrm { l o g } \\bar { ( 1 - D ( \\mu _ { E } ( \\mathbf { s } ) ) ) }$ . We refer to this method as variational adversarial imitation learning (VAIL). ", + "bbox": [ + 176, + 440, + 828, + 484 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "4.3 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING ", + "text_level": 1, + "bbox": [ + 171, + 502, + 751, + 517 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The VDB can also be applied to adversarial inverse reinforcement learning (Fu et al., 2017) to yield a new algorithm which we call variational adversarial inverse reinforcement learning (VAIRL). AIRL operates in a similar manner to GAIL, but with a discriminator of the form ", + "bbox": [ + 174, + 527, + 826, + 571 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/7212ad8fa14e280e84e215b3c1ebb3635bdd15a3d80df61875e40e7c9f5fa2cb.jpg", + "text": "$$\nD ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) = \\frac { \\exp \\left( f ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) \\right) } { \\exp \\left( f ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) \\right) + \\pi ( { \\bf a } | { \\bf s } ) } ,\n$$", + "text_format": "latex", + "bbox": [ + 359, + 579, + 635, + 613 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "where $f ( \\mathbf { s } , \\mathbf { a } , \\mathbf { s } ^ { \\prime } ) = g ( \\mathbf { s } , \\mathbf { a } ) + \\gamma h ( \\mathbf { s } ^ { \\prime } ) - h ( \\mathbf { s } )$ , with $g$ and $h$ being learned functions. Under certain restrictions on the environment, Fu et al. show that if $g ( \\mathbf { s } , \\mathbf { a } )$ is defined to depend only on the current state s, the optimal $g ( \\mathbf { s } )$ recovers the expert’s true reward function $r ^ { * } ( \\mathbf { s } )$ up to a constant $g ^ { * } ( \\mathbf { s } ) =$ $r ^ { * } ( \\mathbf { s } ) + \\mathrm { c o n s i }$ . In this case, the learned reward can be re-used to train policies in environments with different dynamics, and will yield the same policy as if the policy was trained under the expert’s true reward. In contrast, GAIL’s discriminator typically cannot be re-optimized in this way $\\mathrm { F u }$ et al., 2017). In VAIRL, we introduce stochastic encoders $E _ { g } ( \\mathbf { z } _ { g } | \\mathbf { s } ) , E _ { h } ( \\mathbf { z } _ { h } | \\mathbf { s } )$ , and $g ( \\mathbf { z } _ { g } ) , h ( \\mathbf { z } _ { h } )$ are modified to be functions of the encoding. We can reformulate Equation 13 as ", + "bbox": [ + 173, + 619, + 826, + 733 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/c1dca0371bef123778f4f080d879166ca195632e96802ff6f086b8a42f2f8f6d.jpg", + "text": "$$\nD ( { \\bf s } , { \\bf a } , { \\bf z } ) = \\frac { \\exp \\left( f ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } ) \\right) } { \\exp \\left( f ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } ) \\right) + \\pi ( { \\bf a } | { \\bf s } ) } ,\n$$", + "text_format": "latex", + "bbox": [ + 351, + 739, + 643, + 775 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "for ${ \\bf z } = ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } )$ and $f ( \\mathbf { z } _ { g } , \\mathbf { z } _ { h } , \\mathbf { z } _ { h } ^ { \\prime } ) = D _ { g } ( \\mathbf { z } _ { g } ) + \\gamma D _ { h } ( \\mathbf { z } _ { h } ^ { \\prime } ) - D _ { h } ( \\mathbf { z } _ { h } )$ . We then obtain a modified objective of the form ", + "bbox": [ + 171, + 784, + 825, + 813 + ], + "page_idx": 5 + }, + { + "type": "equation", + "img_path": "images/1b797afaffb0023bf2f8d8a496142db37efa8b3c460674ad00f77ffd5ec2295e.jpg", + "text": "$$\n\\begin{array} { r l } { J ( D , E ) = \\underset { D , E } { \\mathrm { m i n } } \\underset { \\beta \\geq 0 } { \\mathrm { m a x } } } & { \\mathbb { E } _ { \\mathbf { s } , \\mathbf { s } ^ { \\prime } \\sim \\pi ^ { * } ( \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) } \\left[ - \\log \\left( D ( \\mathbf { s } , \\mathbf { a } , \\mathbf { z } ) \\right) \\right] \\right] } \\\\ & { + \\mathbb { E } _ { \\mathbf { s } , \\mathbf { s } ^ { \\prime } \\sim \\pi ( \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { s } , \\mathbf { a } , \\mathbf { z } ) \\right) \\right] \\right] } \\\\ & { + \\beta \\left( \\mathbb { E } _ { \\mathbf { s } , \\mathbf { s } ^ { \\prime } \\sim \\pi ( \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } \\mid \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) | | r ( \\mathbf { z } ) \\right] \\right] - I _ { c } \\right) , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 243, + 819, + 753, + 888 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "where $\\pi ( s , s ^ { \\prime } )$ denotes the joint distribution of successive states from a policy, and $E ( \\mathbf { z } | \\mathbf { s } , \\mathbf { s } ^ { \\prime } ) =$ $E _ { g } ( \\mathbf { z } _ { g } | \\mathbf { s } ) { \\cdot } E _ { h } ( \\mathbf { z } _ { h } | \\mathbf { s } ) { \\cdot } E _ { h } ( \\mathbf { z } _ { h } ^ { \\prime } | \\bar { \\mathbf { s } } ^ { \\prime } )$ . ", + "bbox": [ + 173, + 895, + 825, + 925 + ], + "page_idx": 5 + }, + { + "type": "image", + "img_path": "images/f8345f9a0288395a6d57696ed487a1c948855dd61361b99c00b0067aa21d534b.jpg", + "image_caption": [ + "Figure 4: Learning curves comparing VAIL to other methods for motion imitation. Performance is measured using the average joint rotation error between the simulated character and the reference motion. Each method is evaluated with 3 random seeds. " + ], + "image_footnote": [], + "bbox": [ + 179, + 104, + 820, + 234 + ], + "page_idx": 6 + }, + { + "type": "table", + "img_path": "images/346089c245b30bd37a6cd509146d18600d174fb1785c12f06f4b747a34482c63.jpg", + "table_caption": [], + "table_footnote": [ + "Table 1: Average joint rotation error (radians) on humanoid motion imitation tasks. VAIL outperforms the other methods for all skills evaluated, except for policies trained using the manuallydesigned reward function from (Peng et al., 2018). " + ], + "table_body": "
MethodBackflipCartwheelDanceRunSpinkick
BC3.012.882.932.632.88
Merel et al., 20171.33 ± 0.031.47 ± 0.122.61 ± 0.300.52 ± 0.041.82 ± 0.35
GAIL0.74±0.150.84± 0.051.31 ± 0.160.17±0.031.07 ± 0.03
GAIL -noise0.42±0.020.92±0.070.96±0.080.21±0.050.95±0.14
GAIL - noise z0.67±0.120.72± 0.041.14 ± 0.080.14±0.030.64±0.09
GAIL - GP0.62±0.090.69 ±0.050.80± 0.320.12 ± 0.020.64± 0.04
VAIL (ours)0.36±0.130.40±0.080.40±0.210.13±0.010.34± 0.05
VAIL - GP (ours)0.46±0.170.31 ± 0.020.15±0.010.10±0.010.31 ± 0.02
Peng et al., 20180.260.210.200.140.19
", + "bbox": [ + 181, + 286, + 816, + 424 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "5 EXPERIMENTS ", + "text_level": 1, + "bbox": [ + 174, + 478, + 326, + 493 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "We evaluate our method on adversarial learning problems in imitation learning, inverse reinforcement learning, and image generation. In the case of imitation learning, we show that the VDB enables agents to learn complex motion skills from a single demonstration, including visual demonstrations provided in the form of video clips. We also show that the VDB improves the performance of inverse RL methods. Inverse RL aims to reconstruct a reward function from a set demonstrations, which can then used to perform the task in new environments, in contrast to imitation learning, which aims to recover a policy directly. Our method is also not limited to control tasks, and we demonstrate its effectiveness for unconditional image generation. ", + "bbox": [ + 174, + 510, + 825, + 622 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "5.1 VAIL: VARIATIONAL ADVERSARIAL IMITATION LEARNING ", + "text_level": 1, + "bbox": [ + 173, + 640, + 625, + 655 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "The goal of the motion imitation tasks is to train a simulated character to mimic demonstrations provided by mocap clips recorded from human actors. Each mocap clip provides a sequence of target states $\\big \\{ \\mathbf { s } _ { 0 } ^ { * } , \\mathbf { s } _ { 1 } ^ { * } , . . . , \\mathbf { s } _ { T } ^ { * } \\big \\}$ that the character should track at each timestep. We use a similar experimental setup as Peng et al. (2018), with a 34 degrees-of-freedom humanoid character. We found that the discriminator architecture can greatly affect the performance on complex skills. The particular architecture we employ differs substantially from those used in prior work (Merel et al., 2017), details of which are available in Appendix C. The encoding $Z$ is 128D and an information constraint of $I _ { c } = 0 . 5$ is applied for all skills, with a dual stepsize of $\\alpha _ { \\beta } = 1 0 ^ { - 5 }$ . All policies are trained using PPO (Schulman et al., 2017). ", + "bbox": [ + 174, + 666, + 825, + 791 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "The motions learned by the policies are best seen in the supplementary video. Snapshots of the character’s motions are shown in Figure 3. Each skill is learned from a single demonstration. VAIL is able to closely reproduce a variety of skills, including those that involve highly dynamics flips and complex contacts. We compare VAIL to a number of other techniques, including state-only GAIL (Ho & Ermon, 2016), GAIL with instance noise applied to the discriminator inputs (GAIL - noise), GAIL with instance noise applied to the last hidden layer (GAIL - noise z), and GAIL with a gradient penalty applied to the discriminator (GAIL - GP) (Mescheder et al., 2018). Since the VDB helps to prevent vanishing gradients, while GP mitigates exploding gradients, the two techniques can be seen as being complementary. Therefore, we also train a model that combines both VAIL and GP (VAIL - ", + "bbox": [ + 173, + 797, + 825, + 924 + ], + "page_idx": 6 + }, + { + "type": "image", + "img_path": "images/7497cb73e50bbfbd813c2ffce4161f7254aec761aabb16358d90c1638d8e73f8.jpg", + "image_caption": [ + "Figure 5: Left: Snapshots of the video demonstration and the simulated character trained with VAIL. The policy learns to run by directly imitating the video. Right: Saliency maps that visualize the magnitude of the discriminator’s gradient with respect to all channels of the RGB input images from both the demonstration and the simulation. Pixel values are normalized between [0, 1]. " + ], + "image_footnote": [], + "bbox": [ + 186, + 98, + 805, + 241 + ], + "page_idx": 7 + }, + { + "type": "image", + "img_path": "images/5f2f5cf0687f611bc03d408752373a1aaf35da53c395f876a101449a9d723a44.jpg", + "image_caption": [ + "Figure 6: Left: Learning curves comparing policies for the video imitation task trained using a pixel-wise loss as the reward, GAIL, and VAIL. Only VAIL successfully learns to run from a video demonstration. Middle: Effect of training with fixed values of $\\beta$ and adaptive $\\beta$ $I _ { c } = 0 . 5$ ). Right:. KL loss over the course of training with adaptive $\\beta$ . The dual gradient descent update for $\\beta$ effectively enforces the VDB constraint $I _ { c }$ . " + ], + "image_footnote": [], + "bbox": [ + 179, + 311, + 816, + 429 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "GP). Implementation details for combining the VDB and GP are available in Appendix B. Learning curves for the various methods are shown in Figure 10 and Table 1 summarizes the performance of the final policies. Performance is measured in terms of the average joint rotation error between the simulated character and the reference motion. We also include a reimplementation of the method described by Merel et al. (2017). For the purpose of our experiments, GAIL denotes policies trained using our particular architecture but without a VDB, and Merel et al. (2017) denotes policies trained using an architecture that closely mirror those from previous work. Furthermore, we include comparisons to policies trained using the handcrafted reward from Peng et al. (2018), as well as policies trained via behavioral cloning (BC). Since mocap data does not provide expert actions, we use the policies from Peng et al. (2018) as oracles to provide state-action demonstrations, which are then used to train the BC policies via supervised learning. Each BC policy is trained with $1 0 \\mathrm { k }$ samples from the oracle policies, while all other policies are trained from just a single demonstration, the equivalent of approximately 100 samples. ", + "bbox": [ + 174, + 520, + 825, + 700 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "VAIL consistently outperforms previous adversarial methods, and VAIL - GP achieves the best performance overall. Simply adding instance noise to the inputs (Salimans et al., 2016) or hidden layer without the KL constraint (Sønderby et al., 2016) leads to worse performance, since the network can learn a latent representation that renders the effects of the noise negligible. Though training with the handcrafted reward still outperforms the adversarial methods, VAIL demonstrates comparable performance to the handcrafted reward without manual reward or feature engineering, and produces motions that closely resemble the original demonstrations. The method from Merel et al. (2017) was able to imitate simple skills such as running, but was unable to reproduce more acrobatic skills such as the backflip and spinkick. In the case of running, our implementation produces more natural gaits than the results reported in Merel et al. (2017). Behavioral cloning is unable to reproduce any of the skills, despite being provided with substantially more demonstration data than the other methods. ", + "bbox": [ + 174, + 708, + 825, + 861 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Video Imitation: While our method achieves substantially better results on motion imitation when compared to prior work, previous methods can still produce reasonable behaviors. However, if the demonstrations are provided in terms of the raw pixels from video clips, instead of mocap data, the imitation task becomes substantially harder. The goal of the agent is therefore to directly imitate the skill depicted in the video. This is also a setting where manually engineering rewards is impractical, since simple losses like pixel distance do not provide a semantically meaningful measure of similarity. Figure 6 compares learning curves of policies trained with VAIL, GAIL, and policies trained using a reward function defined by the average pixel-wise difference between the frame $M _ { t } ^ { * }$ from the video demonstration and a rendered image $M _ { t }$ of the agent at each timestep $t$ , $\\begin{array} { r } { r _ { t } = 1 - \\frac { 1 } { 3 \\times 6 4 ^ { 2 } } | | M _ { t } ^ { * } - M _ { t } | | ^ { 2 } } \\end{array}$ . Each frame is represented by a $6 4 \\times 6 4$ RGB image. ", + "bbox": [ + 174, + 867, + 823, + 924 + ], + "page_idx": 7 + }, + { + "type": "image", + "img_path": "images/9a3768a8c49373d423021d089034c2c03922c0410f3b165f6f1fe6e355dafe56.jpg", + "image_caption": [ + "Figure 7: Left: C-Maze and S-Maze. When trained on the training maze on the left, AIRL learns a reward that overfits to the training task, and which cannot be transferred to the mirrored maze on the right. In contrast, VAIRL learns a smoother reward function that enables more-reliable transfer. Right: Performance on flipped test versions of our two training mazes. We report mean return ( $\\pm$ std. dev.) over five runs, and the mean return for the expert used to generate demonstrations. " + ], + "image_footnote": [], + "bbox": [ + 199, + 103, + 470, + 241 + ], + "page_idx": 8 + }, + { + "type": "table", + "img_path": "images/c028908b87244d0b992d3d4f0899e397d03395355e22beb227d88af6ea65a479.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
MethodTransferenvironments
C-mazeS-maze
GAIL-24.6±7.21.0±1.3
VAIL-65.6±18.920.8±39.7
AIRL-15.3±7.8-0.2±0.1
AIRL - GP-9.14±0.4-0.14±0.3
VAIRL (β = 0)-25.5±7.262.3±33.2
VAIRL (ours)-10.0±2.274.0±38.7
VAIRL - GP (ours)-9.18±0.4156.5±5.6
TRPO expert-5.1153.2
", + "bbox": [ + 488, + 104, + 794, + 241 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 329, + 825, + 415 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "Both GAIL and the pixel-loss are unable to learn the running gait. VAIL is the only method that successfully learns to imitate the skill from the video demonstration. Snapshots of the video demonstration and the simulated motion is available in Figure 5. To further investigate the effects of the VDB, we visualize the gradient of the discriminator with respect to images from the video demonstration and simulation. Saliency maps for discriminators trained with VAIL and GAIL are available in Figure 5. The VAIL discriminator learns to attend to spatially coherent image patches around the character, while the GAIL discriminator exhibits less structure. The magnitude of the gradients from VAIL also tend to be significantly larger than those from GAIL, which may suggests that VAIL is able to mitigate the problem of vanishing gradients present in GAIL. ", + "bbox": [ + 174, + 421, + 825, + 547 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "Adaptive Constraint: To evaluate the effects of the adaptive $\\beta$ updates, we compare policies trained with different fixed values of $\\beta$ and policies where $\\beta$ is updated adaptively to enforce a desired information constraint $I _ { c } = 0 . 5$ . Figure 6 illustrates the learning curves and the KL loss over the course of training. When $\\beta$ is too small, performance reverts to that achieved by GAIL. Large values of $\\beta$ help to smooth the discriminator landscape and improve learning speed during the early stages of training, but converges to a worse performance. Policies trained using dual gradient descent to adaptively update $\\beta$ consistently achieves the best performance overall. ", + "bbox": [ + 174, + 554, + 825, + 651 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "5.2 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING ", + "text_level": 1, + "bbox": [ + 173, + 674, + 750, + 688 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "Next, we use VAIRL to recover reward functions from demonstrations. Unlike the discriminator learned by VAIL, the reward function recovered by VAIRL can be re-optimized to train new policies from scratch in the same environment. In some cases, it can also be used to transfer similar behaviour to different environments. In Figure 7, we show the results of applying VAIRL to the C-maze from Fu et al. (2017), and a more complex S-maze; the simple 2D observation spaces of these tasks make it easy to interpret the recovered reward functions. In both mazes, the expert is trained to navigate from a start position at the bottom of the maze to a fixed target position at the top. We use each method to obtain an imitation policy and to approximate the expert’s reward on the original maze. The recovered reward is then used to train a new policy to solve a left–right flipped version of the training maze. On the C-maze, we found that plain AIRL—without a gradient penalty— would sometimes overfit and fail to transfer to the new environment, as evidenced by the reward visualization in Figure 7 (left) and the higher return variance in Figure 7 (right). In contrast, by incorporating a VDB into AIRL, VAIRL learns a substantially smoother reward function that is more suitable for transfer. Furthermore, we found that in the S-maze with two internal walls, AIRL was too unstable to acquire a meaningful reward function. This was true even with the use of a gradient penalty. In contrast, VAIRL was able to learn a reasonable reward in most cases without a gradient penalty, and its performance improved even further with the addition of a gradient penalty. To evaluate the effects of the VDB, we observe that the performance of VAIRL drops on both tasks when the KL constraint is disabled $\\mathcal { B } = 0$ ), suggesting that the improvements from the VDB cannot be attributed entirely to the noise introduced by the sampling process for z. Further details of these experiments and illustrations of the recovered reward functions are available in Appendix D. ", + "bbox": [ + 174, + 702, + 825, + 922 + ], + "page_idx": 8 + }, + { + "type": "image", + "img_path": "images/c86c34eae7b7dab70e64c321c0f81908e190aa387a041d3cc2f92e4b2ee908cc.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 207, + 99, + 789, + 252 + ], + "page_idx": 9 + }, + { + "type": "image", + "img_path": "images/78b0c0503897ba4746233494cfd31890b086ca770f3439471530fef4c520776d.jpg", + "image_caption": [ + "Figure 8: Comparison of VGAN and other methods on CIFAR-10, with performance evaluated using the Frechet Inception Distance (FID). ´ ", + "Figure 9: VGAN samples on CIFAR-10, CelebA $1 2 8 \\times 1 2 8$ , and CelebAHQ $1 0 2 4 \\times 1 0 2 4$ . " + ], + "image_footnote": [], + "bbox": [ + 176, + 285, + 823, + 386 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 412, + 825, + 482 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "5.3 VGAN: VARIATIONAL GENERATIVE ADVERSARIAL NETWORKS ", + "text_level": 1, + "bbox": [ + 178, + 492, + 658, + 507 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "Finally, we apply the VDB to image generation with generative adversarial networks, which we refer to as VGAN. Experiment are conducted on CIFAR-10 (Krizhevsky et al.), CelebA (Liu et al. (2015)), and CelebAHQ (Karras et al., 2018) datasets. We compare our approach to recent stabilization techniques: WGAN-GP (Gulrajani et al., 2017b), instance noise (Sønderby et al., 2016; Arjovsky & Bottou, 2017), spectral normalization (SN) (Miyato et al., 2018), and gradient penalty (GP) (Mescheder et al., 2018), as well as the original GAN (Goodfellow et al., 2014) on CIFAR10. To measure performance, we report the Frechet Inception Distance (FID) (Heusel et al., 2017), ´ which has been shown to be more consistent with human evaluation. All methods are implemented using the same base model, built on the resnet architecture of Mescheder et al. (2018). Aside from tuning the KL constraint $I _ { c }$ for VGAN, no additional hyperparameter optimization was performed to modify the settings provided by Mescheder et al. (2018). The performance of the various methods on CIFAR-10 are shown in Figure 8. While vanilla GAN and instance noise are prone to diverging as training progresses, VGAN remains stable. Note that instance noise can be seen as a non-adaptive version of VGAN without constraints on $I _ { c }$ . This experiment again highlights that there is a significant improvement from imposing the information bottleneck over simply adding instance noise. Combining both VDB and gradient penalty (VGAN - GP) achieves the best performance overall with an FID of 18.1. We also experimented with combining the VDB with SN, but this combination is prone to diverging. See Figure 9 for samples of images generated with our approach. Please refer to Appendix E for experimental details and more results. ", + "bbox": [ + 174, + 517, + 825, + 781 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "6 CONCLUSION ", + "text_level": 1, + "bbox": [ + 174, + 801, + 318, + 818 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "We present the variational discriminator bottleneck, a general regularization technique for adversarial learning. Our experiments show that the VDB is broadly applicable to a variety of domains, and yields significant improvements over previous techniques on a number of challenging tasks. While our experiments have produced promising results for video imitation, the results have been primarily with videos of synthetic scenes. We believe that extending the technique to imitating realworld videos is an exciting direction. Another exciting direction for future work is a more in-depth theoretical analysis of the method, to derive convergence and stability results or conditions. ", + "bbox": [ + 174, + 827, + 825, + 924 + ], + "page_idx": 9 + }, + { + "type": "text", + "text": "ACKNOWLEDGEMENTS ", + "text_level": 1, + "bbox": [ + 176, + 103, + 367, + 117 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "We would like to thank the anonymous reviewers for their helpful feedback, and AWS and NVIDIA for providing computational resources. This research was funded by an NSERC Postgraduate Scholarship, a Berkeley Fellowship for Graduate Study, BAIR, Huawei, and ONR PECASE N000141612723. ", + "bbox": [ + 174, + 133, + 825, + 189 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "REFERENCES ", + "text_level": 1, + "bbox": [ + 174, + 212, + 285, + 228 + ], + "page_idx": 10 + }, + { + "type": "text", + "text": "Alessandro Achille and Stefano Soatto. 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Energy-based generative adversarial network.¨ CoRR, abs/1609.03126, 2016. URL http://arxiv.org/abs/1609.03126. ", + "bbox": [ + 174, + 282, + 823, + 310 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "SUPPLEMENTARY MATERIAL ", + "bbox": [ + 176, + 102, + 416, + 117 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "A ANALYSIS AND PROOFS ", + "text_level": 1, + "bbox": [ + 176, + 138, + 408, + 155 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "In this appendix, we show that the gradient of the generator when the discriminator is augmented with the VDB is non-degenerate, under some mild additional assumptions. First, we assume a pointwise constraint of the form $\\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) \\| r ( \\mathbf { z } ) ] \\leq I _ { c }$ for all $\\mathbf { x }$ . In reality, we use an average KL constraint, since we found it to be more convenient to optimize, though a pointwise constraint is also possible to enforce by using the largest constraint violation to increment $\\beta$ . We could likely also extend the analysis to the average constraint, though we leave this to future work. The main theorem can then be stated as follows: ", + "bbox": [ + 173, + 172, + 825, + 271 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Theorem A.1. Let $g ( \\mathbf { u } )$ denote the generator’s mapping from a noise vector $\\mathbf { u } \\sim p ( \\mathbf { u } )$ to a point in $X$ . Given the generator distribution $G ( \\mathbf { x } )$ and data distribution $p ^ { * } ( \\mathbf { x } )$ , a VDB with an encoder $E ( \\mathbf { z } | \\mathbf { x } ) = \\mathcal { N } ( \\mu _ { E } ( \\mathbf { x } ) , \\Sigma )$ , and $\\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) \\| r ( \\mathbf { z } ) ] \\leq I _ { c } ,$ the gradient passed to the generator has the form ", + "bbox": [ + 174, + 277, + 825, + 334 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/920a9f9639a8ef920f6c11b0b0c8fb06ab956d660265caf8ebc14d08a8a5df43.jpg", + "text": "$$\n\\begin{array} { l } { \\nabla _ { g } \\mathbb { E } _ { { \\mathbf { u } } \\sim p ( { \\mathbf { u } } ) } \\left[ \\log \\left( 1 - D ^ { * } ( \\mu _ { E } ( g ( { \\mathbf { u } } ) ) ) \\right) \\right] } \\\\ { = \\mathbb { E } _ { { \\mathbf { u } } \\sim p ( { \\mathbf { u } } ) } \\left[ a ( { \\mathbf { u } } ) \\int E ( \\mu _ { E } ( g ( { \\mathbf { u } } ) ) | { \\mathbf { x } } ) \\nabla _ { g } | | \\mu _ { E } ( g ( { \\mathbf { u } } ) ) - \\mu _ { E } ( { \\mathbf { x } } ) | | ^ { 2 } d p ^ { * } ( { \\mathbf { x } } ) \\right. } \\\\ { \\left. - b ( { \\mathbf { u } } ) \\int E ( \\mu _ { E } ( g ( { \\mathbf { u } } ) ) | { \\mathbf { x } } ) \\nabla _ { g } | | \\mu _ { E } ( g ( { \\mathbf { u } } ) ) - \\mu _ { E } ( { \\mathbf { x } } ) | | ^ { 2 } d G ( { \\mathbf { x } } ) \\right] } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 220, + 343, + 776, + 435 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "where $D ^ { * } ( \\mathbf { z } )$ is the optimal discriminator, $a ( \\mathbf { x } )$ and $b ( \\mathbf { x } )$ are positive functions, and we always have $E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } ) > C ( I _ { c } )$ , where $C ( I _ { c } )$ is a continuous monotonic function, and $C ( I _ { c } ) \\delta > 0$ as $I _ { c } \\to 0$ . ", + "bbox": [ + 176, + 445, + 823, + 488 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Analysis for an encoder with an input-dependent variance $\\Sigma ( \\mathbf { x } )$ is also possible, but more involved. We’ll further assume below for notational simplicity that $\\Sigma$ is diagonal with diagonal values $\\sigma ^ { 2 }$ . This assumption is not required, but substantially simplifies the linear algebra. Analogously to Theorem 3.2 from Arjovsky & Bottou (2017), this theorem states that the gradient of the generator points in the direction of points in the data distribution, and away from points in the generator distribution. However, going beyond the theorem in Arjovsky & Bottou (2017), this result states that the coefficients on these vectors, given by $E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } )$ , are always bounded below by a value that approaches a positive constant $\\delta$ as we decrease $I _ { c }$ , meaning that the gradient does not vanish. The proof of the first part of this theorem is essentially identical to the proof presented by Arjovsky & Bottou (2017), but accounting for the fact that the noise is now injected into the latent space of the VDB, rather than being added directly to $\\mathbf { x }$ . This result assumes that $E ( { \\bf z } | { \\bf x } )$ has a learned but input-independent variance $\\Sigma = \\sigma ^ { 2 } I$ , though the proof can be repeated for an input-dependent or non-diagonal $\\Sigma$ : ", + "bbox": [ + 173, + 501, + 825, + 683 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Proof. Overloading $p ^ { * } ( \\mathbf { x } )$ and $G ( \\mathbf { x } )$ , let $p ^ { * } ( \\mathbf { z } )$ and $G ( \\mathbf { z } )$ be the distribution of embeddings $\\mathbf { z }$ under the real data and generator respectively. $p ^ { * } ( \\mathbf { z } )$ is then given by ", + "bbox": [ + 173, + 713, + 823, + 743 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/1f93fdb341111a04c1672b54c00d0252b9311dc0f1f641a44ce2a5b18432a8cf.jpg", + "text": "$$\np ^ { * } ( \\mathbf { z } ) = \\mathbb { E } _ { \\mathbf { x } \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) \\right] = \\int E ( \\mathbf { z } | \\mathbf { x } ) d p ^ { * } ( \\mathbf { x } ) ,\n$$", + "text_format": "latex", + "bbox": [ + 336, + 753, + 658, + 786 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "and similarly for $G ( z )$ ", + "bbox": [ + 173, + 797, + 323, + 813 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/8545ed1ee02b477c53feb58f46da11289d0557a3efcfea99b5bea061fb7e6b5e.jpg", + "text": "$$\nG ( \\mathbf { z } ) = \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) \\right] = \\int E ( \\mathbf { z } | \\mathbf { x } ) d G ( \\mathbf { x } ) ,\n$$", + "text_format": "latex", + "bbox": [ + 341, + 824, + 655, + 857 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "From Arjovsky $\\&$ Bottou (2017), the optimal discriminator between $p ^ { * } ( \\mathbf { z } )$ and $G ( \\mathbf { z } )$ is ", + "bbox": [ + 173, + 867, + 740, + 883 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/e6f732f58b2e640f809d173c04ce002eb98408d2d88396e38061b6d9907ee6c1.jpg", + "text": "$$\nD ^ { * } ( \\mathbf { z } ) = \\frac { p ^ { * } ( \\mathbf { z } ) } { p ^ { * } ( \\mathbf { z } ) + G ( \\mathbf { z } ) }\n$$", + "text_format": "latex", + "bbox": [ + 418, + 895, + 580, + 928 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "The gradient passed to the generator then has the form ", + "bbox": [ + 173, + 103, + 531, + 118 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/c3c05677a3c537c8dc45362d8aa1f15402b3061d3c7d69569b0300e521294a24.jpg", + "text": "$$\n\\begin{array} { r l } & { \\nabla _ { g } \\mathbb { E } _ { \\mathbf { u } \\sim p ( \\mathbf { u } ) } \\left[ \\log \\left( 1 - D ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right) \\right] } \\\\ & { \\qquad = \\mathbb { E } _ { \\mathbf { u } \\sim p ( \\mathbf { u } ) } \\left[ \\nabla _ { g } \\log \\left( G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right) - \\nabla _ { g } \\log \\left( p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right) \\right] } \\\\ & { \\qquad = \\mathbb { E } _ { \\mathbf { u } \\sim p ( \\mathbf { u } ) } \\left[ \\frac { \\nabla _ { g } G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } { G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } - \\frac { \\nabla _ { g } p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + \\nabla _ { g } G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\right] } \\\\ & { \\qquad = \\mathbb { E } _ { \\mathbf { u } \\sim p ( \\mathbf { u } ) } \\left[ \\frac { 1 } { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\nabla _ { g } \\left[ - p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right] \\right. } \\\\ & { \\qquad \\left. - \\frac { 1 } { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\frac { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } { G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\nabla _ { g } \\left[ - G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right] \\right] . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 199, + 126, + 802, + 273 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Let ", + "bbox": [ + 171, + 279, + 199, + 292 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/2e66905a8c3fb2b253efdfe547a69975a7063d613c9a6cc78142f6b0127fff32.jpg", + "text": "$$\n\\begin{array} { l } { { \\displaystyle a ( { \\bf u } ) = \\frac { 1 } { 2 \\sigma ^ { 2 } } \\frac { 1 } { p ^ { * } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) \\right) + G \\left( \\mu _ { E } ( g ( { \\bf u } ) ) \\right) } \\ ~ } } \\\\ { { \\displaystyle b ( { \\bf u } ) = \\frac { 1 } { 2 \\sigma ^ { 2 } } \\frac { 1 } { p ^ { * } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) \\right) + G \\left( \\mu _ { E } ( g ( { \\bf u } ) ) \\right) } \\frac { p ^ { * } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) \\right) } { G \\left( \\mu _ { E } ( g ( { \\bf u } ) ) \\right) } . } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 302, + 299, + 696, + 369 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "We then have ", + "bbox": [ + 174, + 375, + 266, + 388 + ], + "page_idx": 15 + }, + { + "type": "equation", + "img_path": "images/4add33a85dfc7ec8e887019d8e7a12ca2dfe40981c1f94e9f8ec9180caedc177.jpg", + "text": "$$\n\\begin{array} { r l } & { \\varepsilon _ { \\mathrm { S P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ^ { 2 } ( \\varepsilon ) ( \\varepsilon ) ( \\eta ) \\} } \\\\ & { \\quad - \\varepsilon _ { \\mathrm { S P } } ( \\varepsilon ) \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ^ { 2 } ( \\varepsilon ) ( \\eta ) \\} = \\int _ { - \\varepsilon } ^ { \\varepsilon } \\gamma _ { \\varepsilon } \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) ( \\varepsilon ) ( \\eta ) - 2 \\eta ^ { \\varepsilon } \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) ( \\eta ) \\int _ { - \\varepsilon } ^ { \\varepsilon } \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) ( \\varepsilon ) ( \\eta ) \\int _ { - \\varepsilon } ^ { \\varepsilon } \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) ( \\varepsilon ) ( \\eta ) } \\\\ & { \\quad - \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ( \\varepsilon ) ( \\eta ) \\} - \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) ( \\eta ) \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) ( \\eta ) } \\\\ & { \\quad - \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ( \\varepsilon ) ( \\eta ) \\} } \\\\ & { \\quad - \\varepsilon _ { \\mathrm { S P } } ( \\varepsilon ) \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ^ { 2 } ( \\varepsilon ) ( \\eta ) \\} \\int _ { - \\varepsilon } ^ { \\varepsilon } \\varepsilon _ { \\mathrm { P } } ^ { \\varepsilon } \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ( \\varepsilon ) ( \\eta ) \\} } \\\\ & \\quad - \\varepsilon _ { \\mathrm { P } } ( \\varepsilon ) \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon ) \\{ 2 \\sigma ^ { 2 } ( \\eta ) \\} + \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ( \\varepsilon _ { \\mathrm { P } } ^ { ( \\varepsilon ) } ) - \\mu _ \\ \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 232, + 396, + 883, + 723 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Similar to the result from Arjovsky & Bottou (2017), the gradient of the generator drives the generator’s samples in the embedding space $\\mu _ { E } ( g ( { \\bf u } ) )$ towards embeddings of the points from the dataset $\\mu _ { E } ( { \\bf x } )$ weighted by their likelihood $E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } )$ under the real data. For an arbitrary encoder $E$ , real and fake samples in the embedding may be far apart. As such, the coefficients $E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } )$ can be arbitrarily small, thereby resulting in vanishing gradients for the generator. ", + "bbox": [ + 173, + 762, + 825, + 834 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "The second part of the theorem states that $C ( I _ { c } )$ is a continuous monotonic function, and $C ( I _ { c } ) \\delta > 0$ as $I _ { c } \\to 0$ . This is the main result, and relies on the fact that $\\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) ] \\leq I _ { c }$ . The intuition behind this result is that, for any two inputs $\\mathbf { x }$ and $\\mathbf { y }$ , their encoded distributions $E ( { \\bf z } | { \\bf x } )$ and $E ( \\mathbf { z } | \\mathbf { y } )$ have means that cannot be more than some distance apart, and that distance shrinks with $I _ { c }$ . This allows us to bound $E ( \\mu _ { E } ( \\mathbf { y } ) ) | \\mathbf { x } )$ below by $C ( I _ { c } )$ , which ensures that the coefficients on the vectors in the theorem above are always at least as large as $C ( I _ { c } )$ . ", + "bbox": [ + 173, + 839, + 825, + 924 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Proof. Let $r ( \\mathbf { z } ) = \\mathcal { N } ( 0 , I )$ be the prior distribution and suppose the $\\mathrm { K L }$ divergence for all $\\mathbf { x }$ in the dataset and all $g ( \\mathbf { u } )$ generated by the generator are bounded by $I _ { c }$ ", + "bbox": [ + 171, + 102, + 823, + 133 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/08ecc46cb27f31c943c8993ae37b27a2189c9dac4e0e128d62428c0c563cd8b0.jpg", + "text": "$$\n\\begin{array} { r l } & { \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] \\leq I _ { c } , \\quad \\forall \\mathbf { x } , \\ \\mathbf { x } \\sim p ^ { * } ( \\mathbf { x } ) } \\\\ & { \\mathrm { K L } \\left[ E ( \\mathbf { z } | g ( \\mathbf { u } ) ) | | r ( \\mathbf { z } ) \\right] \\leq I _ { c } , \\quad \\forall \\mathbf { u } , \\ \\mathbf { u } \\sim p ( \\mathbf { u } ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 343, + 136, + 650, + 175 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "From the definition of the KL-divergence we can bound the length of all embedding vectors, ", + "bbox": [ + 168, + 178, + 776, + 194 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/77b5439607aaf7085bb24703beb67abeab88d69e20f121f6b063621283c06b13.jpg", + "text": "$$\n\\begin{array} { r } { \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] = \\displaystyle \\frac { 1 } { 2 } \\left( K \\sigma ^ { 2 } + \\mu _ { E } ( \\mathbf { x } ) ^ { T } \\mu _ { E } ( \\mathbf { x } ) - K - K \\log \\sigma ^ { 2 } \\right) \\leq I _ { c } } \\\\ { | | \\mu _ { E } ( \\mathbf { x } ) | | ^ { 2 } \\leq 2 I _ { c } - K \\sigma ^ { 2 } + K + K \\log \\sigma ^ { 2 } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 259, + 196, + 736, + 250 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "and similarly for $| | \\mu _ { E } ( g ( \\mathbf { u } ) ) | | ^ { 2 }$ , with $K$ denoting the dimension of $Z$ . A lower bound on $E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } )$ , where $\\mathbf { u } \\sim p ( \\mathbf { u } )$ and $\\mathbf { x } \\sim p ^ { * } ( \\mathbf { x } )$ , can then be determined by ", + "bbox": [ + 168, + 253, + 826, + 284 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/311546e19c440bc51688721a428e4a8abe5dfbb01bfb1624ec150af54752ca0e.jpg", + "text": "$$\n\\begin{array} { l } { { \\displaystyle { E ( \\mu _ { E } ( g ( { \\bf u } ) ) \\vert { \\bf x } ) } ) = - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) - \\mu _ { E } ( { \\bf x } ) \\right) ^ { T } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) - \\mu _ { E } ( { \\bf x } ) \\right) - \\frac { K } { 2 } \\log \\sigma ^ { 2 } - \\frac { K } { 2 } \\log 2 \\pi } } \\\\ { { \\displaystyle \\approx \\vert \\vert \\mu _ { E } ( { \\bf x } ) \\vert \\vert ^ { 2 } , \\vert \\vert \\mu _ { E } ( g ( { \\bf u } ) ) \\vert \\vert ^ { 2 } \\le 2 I _ { c } - K \\sigma ^ { 2 } + K + K \\log \\sigma ^ { 2 } , \\ ~ } } \\\\ { { \\displaystyle \\qquad \\vert \\vert \\mu _ { E } ( g ( { \\bf u } ) ) - \\mu _ { E } ( { \\bf x } ) \\vert \\vert ^ { 2 } \\le 8 I _ { c } - 4 K \\sigma ^ { 2 } + 4 K + 4 K \\log \\sigma ^ { 2 } , } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 205, + 287, + 848, + 366 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "and it follows that ", + "bbox": [ + 173, + 369, + 295, + 383 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/900ec915554c9024be07da47f510de1c13de78d2b44051fc70ed286905ca6f9c.jpg", + "text": "$$\n- \\frac { 1 } { 2 \\sigma ^ { 2 } } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) - \\mu _ { E } ( { \\bf x } ) \\right) ^ { T } \\left( \\mu _ { E } ( g ( { \\bf u } ) ) - \\mu _ { E } ( { \\bf x } ) \\right) \\ge - 4 \\sigma ^ { - 2 } I _ { c } + 2 K - 2 K \\sigma ^ { - 2 } - 2 K \\sigma ^ { - 2 } \\log \\sigma ^ { - 2 } .\n$$", + "text_format": "latex", + "bbox": [ + 181, + 387, + 838, + 415 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "The likelihood is therefore bounded below by ", + "bbox": [ + 173, + 420, + 473, + 435 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/74b408db71db646f321e88b174697dc2ea6e30ba60b715ad3d380042bfaeec0f.jpg", + "text": "$$\n\\begin{array} { c } { { \\displaystyle \\log \\left( E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } ) \\right) \\geq - 4 \\sigma ^ { - 2 } I _ { c } + 2 K - 2 K \\sigma ^ { - 2 } - 2 K \\sigma ^ { - 2 } \\log { \\sigma ^ { - 2 } } - \\frac { K } { 2 } \\log { \\sigma ^ { 2 } } - \\frac { K } { 2 } \\log { 2 \\pi } } } \\\\ { { \\displaystyle \\mathrm { S i n c e - } \\sigma ^ { - 2 } - \\sigma ^ { - 2 } \\log { \\sigma ^ { - 2 } } \\geq - 1 , \\hfill } } \\\\ { { \\displaystyle \\log \\left( E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } ) \\right) \\geq - 4 \\sigma ^ { - 2 } I _ { c } - \\frac { K } { 2 } \\log { \\sigma ^ { 2 } } - \\frac { K } { 2 } \\log { 2 \\pi } } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 174, + 440, + 818, + 529 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "From the KL constraint, we can derive a lower bound $\\ell ( I _ { c } )$ and an upper bound ${ \\cal U } ( I _ { c } )$ on $\\sigma ^ { 2 }$ . ", + "bbox": [ + 169, + 540, + 782, + 556 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/d9860ccf09f104ec9c74f37670c8a06696869f7760b571390f93e4fc29fb2a9c.jpg", + "text": "$$\n\\begin{array} { l } { { { \\displaystyle { \\frac { 1 } { 2 } } \\left( K \\sigma ^ { 2 } + \\mu _ { E } ( { \\bf x } ) ^ { T } \\mu _ { E } ( { \\bf x } ) - K - K \\log \\sigma ^ { 2 } \\right) \\le I _ { c } } } } \\\\ { { \\displaystyle { \\sigma ^ { 2 } - 1 - \\log \\sigma ^ { 2 } \\le \\frac { 2 I _ { c } } { K } } } } \\\\ { { \\displaystyle { \\log \\sigma ^ { 2 } \\ge - \\frac { 2 I _ { c } } { K } - 1 } } } \\\\ { { \\displaystyle { \\sigma ^ { 2 } \\ge \\exp \\left( - \\frac { 2 I _ { c } } { K } - 1 \\right) = \\ell ( I _ { c } ) } } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 333, + 561, + 665, + 689 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "For the upper bound, since $\\sigma ^ { 2 } - \\log \\sigma ^ { 2 } > { \\textstyle { \\frac { 1 } { 2 } } } \\sigma ^ { 2 }$ , ", + "bbox": [ + 173, + 712, + 488, + 729 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/2fe99374e556dc36c39b7036a726bbd87f0ab605eee95080f8a0f2dc86fb5682.jpg", + "text": "$$\n\\begin{array} { l } { { \\displaystyle { \\sigma ^ { 2 } - 1 - \\log \\sigma ^ { 2 } \\leq \\frac { 2 I _ { c } } { K } } } } \\\\ { { \\displaystyle { \\frac { 1 } { 2 } \\sigma ^ { 2 } - 1 < \\frac { 2 I _ { c } } { K } } } } \\\\ { { \\displaystyle { \\sigma ^ { 2 } < \\frac { 4 I _ { c } } { K } + 2 = \\mathcal { U } ( I _ { c } ) } } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 418, + 736, + 578, + 828 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Substituting $\\ell ( I _ { c } )$ and ${ \\cal U } ( I _ { c } )$ into Equation 14, we arrive at the following lower bound ", + "bbox": [ + 173, + 848, + 738, + 864 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/9de5fd805616c4c165d18811b4c4b929348651d8821fe8102f8942ae6359beff.jpg", + "text": "$$\nE ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } ) > \\exp \\left( - 4 I _ { c } \\exp \\left( \\frac { 2 I _ { c } } { K } + 1 \\right) - \\frac { K } { 2 } \\log \\left( \\frac { 4 I _ { c } } { K } + 2 \\right) - \\frac { K } { 2 } \\log 2 \\pi \\right) = C ( I _ { c } ) .\n$$", + "text_format": "latex", + "bbox": [ + 189, + 869, + 808, + 905 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "B GRADIENT PENALTY ", + "text_level": 1, + "bbox": [ + 176, + 102, + 382, + 118 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "To combine VDB with gradient penalty, we use the reparameterization trick to backprop through the encoder when computing the gradient of the discriminator with respect to the inputs. ", + "bbox": [ + 173, + 133, + 823, + 162 + ], + "page_idx": 17 + }, + { + "type": "equation", + "img_path": "images/96c9e6d330da69df8c7eb9055ca070d402349d07bdd61acb5189d6a209a9271e.jpg", + "text": "$$\n\\begin{array} { r l } { J ( D , E ) = \\underset { D , E } { \\operatorname* { m i n } } } & { \\mathbb { E } _ { x \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( D ( \\mathbf { z } ) \\right) \\right] \\right] + \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { z } ) \\right) \\right] \\right] } \\\\ & { \\quad + w _ { G P } \\mathbb { E } _ { x \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\epsilon \\sim \\mathcal { N } ( 0 , I ) } \\left[ \\frac { 1 } { 2 } | | \\nabla _ { x } D ( \\mu _ { E } ( x ) + \\Sigma _ { E } ( x ) \\epsilon ) | | ^ { 2 } \\right] \\right] } \\\\ { \\mathrm { s . t . } \\quad } & { \\mathbb { E } _ { \\mathbf { x } \\sim \\tilde { p } ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] \\right] \\leq I _ { c } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 185, + 823, + 268 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "The coefficient $w _ { G P }$ weights the gradient penalty in the objective, $w _ { G P } = 1 0$ for the image generation, $w _ { G P } = 1$ for motion imitation, and $w _ { G P } = 0 . 1$ (C-maze) or $w _ { G P } = 0 . 0 1$ (S-maze) for the IRL tasks. The gradient penalty is applied only to real samples $p ^ { * } ( x )$ . We have experimented with apply the penalty to both real and fake samples, but found that performance was worse than penalizing only gradients from real samples. This is consistent with the GP implementation from Mescheder et al. (2018). ", + "bbox": [ + 173, + 285, + 825, + 369 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "C IMITATION LEARNING ", + "text_level": 1, + "bbox": [ + 174, + 390, + 393, + 406 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Experimental Setup: The goal of the motion imitation tasks is to train a simulated agent to mimic a demonstration provided in the form of a mocap clip recorded from a human actor. We use a similar experimental setup as Peng et al. (2018), with a 34 degrees-of-freedom humanoid character. The state s consists of features that represent the configuration of the character’s body (link positions and velocities). We also include a phase variable $\\phi \\in [ 0 , 1 ]$ among the state features, which records the character’s progress along the motion and helps to synchronize the character with the reference motion. With 0 and 1 denoting the start and end of the motion respectively. The action a sampled from the policy $\\pi ( \\mathbf { a } | \\mathbf { s } )$ specifies target poses for PD controller positioned at each joint. Given a state, the policy specifies a Gaussian distribution over the action space $\\pi ( \\mathbf { a } | \\mathbf { s } ) = \\mathcal { N } ( \\mu ( \\mathbf { s } ) , \\Sigma )$ , with a state-dependent mean $\\mu ( \\mathbf { s } )$ and fixed diagonal covariance matrix $\\Sigma$ . $\\mu ( \\mathbf { s } )$ is modeled using a 3- layered fully-connected network with 1024 and 512 hidden units, followed by a linear output layer that specifies the mean of the Gaussian. ReLU activations are used for all hidden layers. The value function is modeled with a similar architecture but with a single linear output unit. The policy is queried at $3 0 H z$ . Physics simulation is performed at $1 . 2 \\mathrm { k H z }$ using the Bullet physics engine Bullet (2015). ", + "bbox": [ + 173, + 420, + 825, + 630 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Given the rewards from the discriminator, PPO (Schulman et al., 2017) is used to train the policy, with a stepsize of $2 . 5 \\times 1 0 ^ { - 6 }$ for the policy, a stepsize of 0.01 for the value function, and a stepsize of $1 0 ^ { - 5 }$ for the discirminator. Gradient descent with momentum 0.9 is used for all models. The PPO clipping threshold is set to 0.2. When evaluating the performance of the policies, each episode is simulated for a maximum horizon of $2 0 s$ . Early termination is triggered whenever the character’s torso contacts the ground, leaving the policy is a maximum error of $\\pi$ radians for all remaining timesteps. ", + "bbox": [ + 173, + 636, + 825, + 734 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Phase-Functioned Discriminator: Unlike the policy and value function, which are modeled with standard fully-connected networks, the discriminator is modeled by a phase-functioned neural network (PFNN) to explicitly model the time-dependency of the reference motion (Holden et al., 2017). While the parameters of a network are generally fixed, the parameters of a PFNN are functions of the phase variable $\\phi$ . The parameters $\\theta$ of the network for a given $\\phi$ is determined by a weighted combination of a set of fixed parameters $\\{ \\theta _ { 0 } , \\theta _ { 1 } , . . . , \\theta _ { k } \\}$ , ", + "bbox": [ + 173, + 741, + 825, + 825 + ], + "page_idx": 17 + }, + { + "type": "equation", + "img_path": "images/fe7ad7bac5c323fd50297e90bbcd89de94a93f57ed041dd445e5adef84f1d625.jpg", + "text": "$$\n\\theta = \\sum _ { i = 0 } ^ { k } w _ { i } ( \\phi ) \\theta _ { i } ,\n$$", + "text_format": "latex", + "bbox": [ + 436, + 832, + 560, + 875 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "where $w _ { i } ( \\phi )$ is a phase-dependent weight for $\\theta _ { i }$ . In our implementation, we use $k = 5$ sets of parameters and $w _ { i } ( \\phi )$ is designed to linearly interpolate between two adjacent sets of parameters for each phase $\\phi$ , where each set of parameters $\\theta _ { i }$ corresponds to a discrete phase value $\\phi _ { i }$ spaced ", + "bbox": [ + 174, + 881, + 825, + 924 + ], + "page_idx": 17 + }, + { + "type": "image", + "img_path": "images/d75d7a0543068769a72e9d9e205a9e3d3f0f65701de88a9b90fd8d4a628e0114.jpg", + "image_caption": [ + "Figure 10: Learning curves comparing VAIL to other methods for motion imitation. Performance is measured using the average joint rotation error between the simulated character and the reference motion. Each method is evaluated with 3 random seeds. " + ], + "image_footnote": [], + "bbox": [ + 183, + 98, + 815, + 366 + ], + "page_idx": 18 + }, + { + "type": "image", + "img_path": "images/5caec7daf65168a42ba692b0bb339931c433a0f09dde3fe83412da4879b5ec7a.jpg", + "image_caption": [ + "Figure 11: Learning curves comparing VAIL with a discriminator modeled by a phase-functioned neural network (PFNN), to modeling the discriminator with a fully-conneted network that receives the phase-variable $\\phi$ as part of the input (no PFNN), and a discriminator modeled with a fullyconnected network but does not receive $\\phi$ as an input (no phase). " + ], + "image_footnote": [], + "bbox": [ + 179, + 434, + 816, + 550 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "uniformly between $[ 0 , 1 ]$ . For a given value of $\\phi$ , the parameters of the discriminator are determined according to ", + "bbox": [ + 168, + 631, + 823, + 659 + ], + "page_idx": 18 + }, + { + "type": "equation", + "img_path": "images/4549dd0729602dde899861f7c2b8b1c6d3cbae6a82eb1cda2b009dbd80c76a79.jpg", + "text": "$$\n\\theta = w _ { i } ( \\phi ) \\theta _ { i } + w _ { i + 1 } ( \\phi ) \\theta _ { i + 1 }\n$$", + "text_format": "latex", + "bbox": [ + 401, + 659, + 594, + 676 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "where $\\theta _ { i }$ and $\\theta _ { i + 1 }$ correspond to the phase values $\\phi _ { i } ~ \\le ~ \\phi ~ < ~ \\phi _ { i + 1 }$ that form the endpoints of the phase interval that contains $\\phi$ . A PFNN is used for all motion imitation experiments, both VAIL and GAIL, except for those that use the approach proposed by Merel et al. (2017), which use standard fully-connected networks for the discriminator. Figure 11 compares the performance of VAIL when the discriminator is modeled with a phase-functioned neural network (with PFNN) to discriminators modeled with standard fully-connected networks. We increased the size of the layers of the fully-connected nets to have a similar number of parameters as a PFNN. We evaluate the performance of fully-connected nets that receive the phase variable $\\phi$ as part of the input (no PFNN), and fully-connected nets that do not receive $\\phi$ as an input. The phase-functioned discriminator leads to significant performance improvements across all tasks evaluated. Policies trained without a phase variable performs worst overall, suggesting that phase information is critical for performance. All methods perform well on simpler skills, such as running, but the additional phase structure introduced by the PFNN proved to be vital for successful imitation of more complex skills, such as the dance and backflip. ", + "bbox": [ + 174, + 680, + 825, + 875 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "Next we compare the accuracy of discriminators trained using different methods. Figure 12 illustrates accuracy of the discriminators over the course of training. Discriminators trained via GAIL quickly overpowers the policy, and learns to accurately differentiate between samples, even when instance noise is applied to the inputs. VAIL without the KL constraint slows the discriminator’s progress, but nonetheless reaches near perfect accuracy with a larger number of samples. Once the KL constraint is enforced, the information bottleneck constrains the performance of the discriminator, converging to approximately $8 0 \\%$ accuracy. Figure 12 also visualizes the value of $\\beta$ over the course of training for motion imitation tasks, along with the loss of the KL term in the objective. The dual gradient descent update effectively enforces the VDB constraint $I _ { c }$ . ", + "bbox": [ + 176, + 882, + 823, + 924 + ], + "page_idx": 18 + }, + { + "type": "image", + "img_path": "images/b6c41654bddeb136cfb4678e2198801a461d01e727e3636d2a6f1dc1cd9fd3ca.jpg", + "image_caption": [ + "Figure 12: Left: Accuracy of the discriminator trained using different methods for imitating the dance skill. Middle:. Value of the dual variable $\\beta$ over the course of training. Right: KL loss over the course of training. The dual gradient descent update for $\\beta$ effectively enforces the VDB constraint $I _ { c }$ . " + ], + "image_footnote": [], + "bbox": [ + 181, + 104, + 818, + 224 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 323, + 825, + 406 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Video Imitation: In the video imitation tasks, we use a simplified 2D biped character in order to avoid issues that may arise due to depth ambiguity from monocular videos. The biped character has a total of 12 degrees-of-freedom, with similar state and action parameters as the humanoid. The video demonstrations are generated by rendering a reference motion into a sequence of video frames, which are then provided to the agent as a demonstration. The goal of the agent is to imitate the motion depicted in the video, without access to the original reference motion, and the reference motion is used only to evaluate performance. ", + "bbox": [ + 174, + 414, + 825, + 511 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "D INVERSE REINFORCEMENT LEARNING ", + "text_level": 1, + "bbox": [ + 174, + 531, + 531, + 547 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "D.1 EXPERIMENTAL SETUP ", + "text_level": 1, + "bbox": [ + 176, + 563, + 377, + 577 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Environments We evaluate on two maze tasks, as illustrated in Figure 13. The C-maze is taken from Fu et al. (2017): in this maze, the agent starts at a random point within a small fixed distance of the mean start position. The agent has a continuous, 2D action space which allows it to accelerate in the $x$ or $y$ directions, and is able to observe its $x$ and $y$ position, but not its velocity. The ground truth reward is $r _ { t } = - d _ { t } - 1 0 ^ { - 3 } \\| a _ { t } \\| ^ { 2 }$ , where $d _ { t }$ is the agent’s distance to the goal, and $a _ { t }$ is its action (this action penalty is assumed to be zero in Figure 13). Episodes terminate after 100 steps; for evaluation, we report the undiscounted mean sum of rewards over each episode The S-maze is larger variant of the same environment with an extra wall between the agent and its goal. To make the S-maze easier to solve for the expert, we added further reward shaping to encourage the agent to pass between the gaps between walls. We also increased the maximum control forces relative to the C-maze to enable more rapid exploration. Environments will be released along with the rest of our VAIRL implementations. ", + "bbox": [ + 174, + 588, + 825, + 755 + ], + "page_idx": 19 + }, + { + "type": "text", + "text": "Hyperparameters Policy networks for all methods were two-layer ReLU MLPs with 32 hidden units per layer. Reward and discriminator networks were similar, but with 32-unit mean and standard deviation layers inserted before the final layer for VDB methods. To generate expert demonstrations, we trained a TRPO (Schulman et al., 2015) agent on the ground truth reward for the training environment for 200 iterations, and saved 107 trajectories from each of the policies corresponding to the five final iterations. TRPO used a batch size of 10,000, a step size of 0.01, and entropy bonus with a coefficient of 0.1 to increase diversity. After generating demonstrations, we trained the IRL and imitation methods on a training maze for 200 iterations; again, our policy optimizer was TRPO with the same hyperparameters used to generate demonstrations. Between each policy update, we did 100 discriminator updates using Adam with a learning rate of $5 \\times 1 0 ^ { - 5 }$ and batch size of 32. For the C-maze our VAIRL runs used a target KL of $I _ { C } = 0 . 5$ , while for the more complex S-maze we use a tighter target of $I _ { C } = 0 . 0 5$ . For the test C-maze, we trained new policies against the recovered reward using TRPO with the hyperparameters described above; for the test S-maze, we modified these parameters to use a batch size of 50,000 and learning rate of 0.001 for 400 iterations. ", + "bbox": [ + 174, + 770, + 825, + 924 + ], + "page_idx": 19 + }, + { + "type": "image", + "img_path": "images/12bc128902971697948715d483d597b425c86c8befea48689d912e331c19ad9a.jpg", + "image_caption": [ + "Figure 13: Left: The C-maze used for training and its mirror version used for testing. Colour contours show the ground truth reward function that we use to train the expert and evaluate transfer quality, while the red and green dots show the initial and goal positions, respectively. Right: The analogous diagram for the S-maze. " + ], + "image_footnote": [], + "bbox": [ + 282, + 107, + 723, + 207 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "", + "bbox": [ + 176, + 315, + 823, + 357 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "D.2 RECOVERED REWARD FUNCTIONS ", + "text_level": 1, + "bbox": [ + 178, + 381, + 452, + 395 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Figure 14 and 15 show the reward functions recovered by each IRL baseline on the C-maze and S-maze, respectively, along with sample trajectories for policies trained to optimize those rewards. Notice that VAIRL tends to recover smoother reward functions that match the ground truth reward more closely than the baselines. Addition of a gradient penalty enhances this effect for both AIRL and VAIRL. This is especially true in S-maze, where combining a gradient penalty with a variational discriminator bottleneck leads to a smooth reward that gradually increases as the agent nears its goal position at the top of the maze. ", + "bbox": [ + 174, + 409, + 825, + 507 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "E IMAGE GENERATION ", + "text_level": 1, + "bbox": [ + 176, + 534, + 382, + 550 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "We provide further experiment on image generation and details of the experimental setup. ", + "bbox": [ + 173, + 569, + 759, + 584 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "E.1 EXPERIMENTAL SETUP: ", + "text_level": 1, + "bbox": [ + 176, + 608, + 382, + 622 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "We use the non-saturating objective of Goodfellow et al. (2014) for all models except WGANGP. Following (Lucic et al., 2017), we compute FID on samples of size $1 0 0 0 0 ^ { 2 }$ . We base our implementation on (Mescheder et al., 2018), where we do not use any batch normalization for both the generator and the discriminator. We use RMSprop (Hinton et al.) and a fixed learning rate for all experiments. ", + "bbox": [ + 174, + 636, + 823, + 705 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "For convolutional GAN, variational discriminative bottleneck is implemented as a 1x1 convolution on the final embedding space that outputs a Gaussian distribution over $Z$ parametrized with a mean and a diagonal covariance matrix. For all image experiments, we preserve the dimensionality of the latent space. All experiments use adaptive $\\beta$ update with a dual stepsize of $\\alpha _ { \\beta } = 1 0 ^ { - 5 }$ . We will make our code public. Similarly to VGAN, instance noise Sønderby et al. (2016); Arjovsky & Bottou (2017) is added to the final embedding space of the discriminator right before applying the classifier. Instance noise can be interpreted as a non-adaptive VGAN without a information constraint. ", + "bbox": [ + 174, + 713, + 825, + 824 + ], + "page_idx": 20 + }, + { + "type": "text", + "text": "Architecture: For CIFAR-10, we use a resnet-based architecture adapted from (Mescheder et al., 2018) detailed in Tables 2, 3, and 4. For CelebA and CelebAHQ, we use the same architecture used in (Mescheder et al., 2018). ", + "bbox": [ + 174, + 847, + 825, + 888 + ], + "page_idx": 20 + }, + { + "type": "image", + "img_path": "images/7d3bc0d020f3fd296b0a917213f8ec69575561699ec2437043741ab56e1b2aef.jpg", + "image_caption": [ + "Figure 14: Visualizations of recovered reward functions transferred to the mirrored C-maze. Also shown are trajectories executed by policies trained to maximize the corresponding reward in the new environment. " + ], + "image_footnote": [], + "bbox": [ + 218, + 145, + 784, + 843 + ], + "page_idx": 21 + }, + { + "type": "image", + "img_path": "images/5caf8907963ae0367361848e6ba59de05031977dd75a83acfbebdb3e3a78005c.jpg", + "image_caption": [ + "Figure 15: Visualizations of recovered reward functions transferred to the mirrored S-maze, like Figure 14. " + ], + "image_footnote": [], + "bbox": [ + 325, + 116, + 686, + 848 + ], + "page_idx": 22 + }, + { + "type": "table", + "img_path": "images/305f5f9f4893f67698264da768cd6a22ab42fcc4445d8d36f7468c7e8efaea19.jpg", + "table_caption": [ + "Table 2: CIFAR-10 Generator " + ], + "table_footnote": [], + "table_body": "
LayerOutput sizeFilter
FCReshape256·4·4256×4×4256→256·4·4
Resnet-blockUpsample128×4×4128×8×8256→128
Resnet-blockUpsample64×8×864 × 16 × 16128→64
Resnet-blockUpsample32 ×16×1632× 32×3264→32
Resnet-blockConv2D32×32×323× 32× 3232→32
", + "bbox": [ + 334, + 101, + 661, + 244 + ], + "page_idx": 23 + }, + { + "type": "table", + "img_path": "images/fcb835a1c77d66c1196af64844be0e0232899e257b10117ab33e141e95b63ccb.jpg", + "table_caption": [ + "Table 3: CIFAR-10 Discriminator " + ], + "table_footnote": [], + "table_body": "
LayerOutput sizeFilter
Conv2D32 × 32 × 323→32
Resnet-blockAvgPool2D64×32×3264 ×16 ×1632→64
Resnet-blockAvgPool2D128×16×16128×8×864→128
Resnet-blockAvgPool2D256×8×8256×4×4128→256
FC1256·4·4→1
", + "bbox": [ + 339, + 284, + 656, + 404 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "E.2 RESULTS ", + "text_level": 1, + "bbox": [ + 174, + 419, + 281, + 434 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "CIFAR-10: We compare our approach with recent stabilization techniques: WGAN-GP (Gulrajani et al., 2017b), instance noise (Sønderby et al., 2016; Arjovsky & Bottou, 2017), spectral normalization (Miyato et al., 2018), and gradient penalty (Mescheder et al., 2018). We train report the networks at $7 5 0 \\mathrm { k }$ iterations. We use $I _ { c } = 0 . 1$ , and a coefficient of $w _ { G P } = 1 0$ for the gradient penalty, which is the same as the value used by the implementation from Mescheder et al. (2018). See Figure 16 for visual comparisons of randomly generated samples. ", + "bbox": [ + 173, + 445, + 825, + 529 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "CelebA: On the CelebA (Liu et al., 2015) dataset, we generate images of size $1 2 8 \\times 1 2 8$ with $I _ { c } = 0 . 2$ . On this dataset we do not see a big improvement upon the other baselines. This is likely because the architecture has been effectively tuned for this task, reflected by the fact that even the vanilla GAN trains fine on this dataset. All GAN, GP, and VGAN-GP obtain a similar FID scores of 7.64, 7.76, 7.25 respectively. See Figure 17 for more qualitative results with our approach. ", + "bbox": [ + 173, + 544, + 825, + 614 + ], + "page_idx": 23 + }, + { + "type": "text", + "text": "CelebAHQ: VGAN can also be trained on on CelebAHQ Karras et al. (2018) at 1024 by 1024 resolution directly, without progressive growing (Karras et al., 2018). We use $I _ { c } = 0 . 1$ and train with VGAN-GP. We train on a single Tesla V100, which fits a batch size of 8 in our experiments. Previous approaches (Karras et al., 2018; Mescheder et al., 2018) use a larger batch size and train over multiple GPUs. The model was trained for $3 0 0 \\mathrm { k }$ iterations. ", + "bbox": [ + 174, + 630, + 825, + 700 + ], + "page_idx": 23 + }, + { + "type": "table", + "img_path": "images/55d73e4fe661f8fd5758993a9c15961d86d8c5870a733c4e42d519d5f7dd082a.jpg", + "table_caption": [ + "Table 4: CIFAR-10 Discriminator with VDB " + ], + "table_footnote": [], + "table_body": "
LayerOutput sizeFilter
Conv2D32 ×32×323→32
Resnet-blockAvgPool2D64×32×3264×16×1632→64
Resnet-blockAvgPool2D128×16×16128×8×864→128
Resnet-blockAvgPool2D256×8×8256×4×4128→256
1×1Conv2D2:256×4×4256→2:256
Sampling256×4×4
FC1256·4·4→1
", + "bbox": [ + 333, + 750, + 663, + 895 + ], + "page_idx": 23 + }, + { + "type": "image", + "img_path": "images/093328ea8485a78bfbb984c256407e8d540314cb0606b17307debb5f2f4316cc.jpg", + "image_caption": [ + "Figure 16: Random results on CIFAR-10 (Krizhevsky et al.): GAN (Goodfellow et al., 2014) FID: 63.6, instance noise (Sønderby et al., 2016; Arjovsky & Bottou, 2017) FID: 30.7, spectral normalization (SN) (Miyato et al., 2018) FID: 23.9, gradient penalty (GP) (Mescheder et al., 2018) FID: 22.6, WGAN-GP Gulrajani et al. (2017b) FID: 19.9, and the proposed VGAN-GP FID: 18.1. The samples produced by VGAN-GP (right) look the most realistic where objects like vehicles may be discerned. " + ], + "image_footnote": [], + "bbox": [ + 179, + 289, + 818, + 633 + ], + "page_idx": 24 + }, + { + "type": "image", + "img_path": "images/0f4c1610d1c621991c4b65e2d319bf2da62a7f55619f72224c958e5aeb05677f.jpg", + "image_caption": [ + "Figure 17: Random VGAN samples on CelebA $1 2 8 \\times 1 2 8$ at $3 0 0 \\mathrm { k }$ iterations. " + ], + "image_footnote": [], + "bbox": [ + 174, + 328, + 825, + 661 + ], + "page_idx": 25 + }, + { + "type": "image", + "img_path": "images/82b55f54f72b88903dca2d47813f7ee3a93f22bbf756b31c3c5ed8a68f59a2c8.jpg", + "image_caption": [ + "Figure 18: VGAN samples on CelebA HQ (Karras et al., 2018) $1 0 2 4 \\times 1 0 2 4$ resolution at $3 0 0 \\mathrm { k }$ iterations. Models are trained from scratch at full resolution, without the progressive scheme proposed by Karras et al. (2017). 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(Video1)", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 16, + "bbox_fs": [ + 140, + 242, + 470, + 452 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 473, + 206, + 485 + ], + "lines": [ + { + "bbox": [ + 105, + 471, + 208, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 208, + 488 + ], + "score": 1.0, + "content": "1 INTRODUCTION", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 26 + }, + { + "type": "text", + "bbox": [ + 107, + 498, + 505, + 640 + ], + "lines": [ + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "score": 1.0, + "content": "Adversarial learning methods provide a promising approach to modeling distributions over high-", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 508, + 505, + 522 + ], + "spans": [ + { + "bbox": [ + 105, + 508, + 505, + 522 + ], + "score": 1.0, + "content": "dimensional data with complex internal correlation structures. These methods generally use a dis-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 520, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 505, + 532 + ], + "score": 1.0, + "content": "criminator to supervise the training of a generator in order to produce samples that are indistinguish-", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 530, + 505, + 543 + ], + "spans": [ + { + "bbox": [ + 105, + 530, + 505, + 543 + ], + "score": 1.0, + "content": "able from the data. A particular instantiation is generative adversarial networks, which can be used", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 541, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 541, + 505, + 554 + ], + "score": 1.0, + "content": "for high-fidelity generation of images (Goodfellow et al., 2014; Karras et al., 2017) and other high-", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 552, + 505, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 505, + 565 + ], + "score": 1.0, + "content": "dimensional data (Vondrick et al., 2016; Xie et al., 2018; Donahue et al., 2018). Adversarial methods", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 563, + 505, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 563, + 505, + 576 + ], + "score": 1.0, + "content": "can also be used to learn reward functions in the framework of inverse reinforcement learning (Finn", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 104, + 572, + 506, + 589 + ], + "spans": [ + { + "bbox": [ + 104, + 572, + 506, + 589 + ], + "score": 1.0, + "content": "et al., 2016a; Fu et al., 2017), or to directly imitate demonstrations (Ho & Ermon, 2016). However,", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 586, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 105, + 586, + 505, + 599 + ], + "score": 1.0, + "content": "they suffer from major optimization challenges, one of which is balancing the performance of the", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 104, + 596, + 505, + 610 + ], + "spans": [ + { + "bbox": [ + 104, + 596, + 505, + 610 + ], + "score": 1.0, + "content": "generator and discriminator. A discriminator that achieves very high accuracy can produce relatively", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 607, + 505, + 620 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 505, + 620 + ], + "score": 1.0, + "content": "uninformative gradients, but a weak discriminator can also hamper the generator’s ability to learn.", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 619, + 505, + 631 + ], + "spans": [ + { + "bbox": [ + 106, + 619, + 505, + 631 + ], + "score": 1.0, + "content": "These challenges have led to widespread interest in a variety of stabilization methods for adversarial", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 629, + 450, + 642 + ], + "spans": [ + { + "bbox": [ + 105, + 629, + 450, + 642 + ], + "score": 1.0, + "content": "learning algorithms (Arjovsky et al., 2017; Kodali et al., 2017; Berthelot et al., 2017).", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 33, + "bbox_fs": [ + 104, + 498, + 506, + 642 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 646, + 505, + 712 + ], + "lines": [ + { + "bbox": [ + 105, + 645, + 505, + 659 + ], + "spans": [ + { + "bbox": [ + 105, + 645, + 505, + 659 + ], + "score": 1.0, + "content": "In this work, we propose a simple regularization technique for adversarial learning, which constrains", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 657, + 505, + 669 + ], + "spans": [ + { + "bbox": [ + 105, + 657, + 505, + 669 + ], + "score": 1.0, + "content": "the information flow from the inputs to the discriminator using a variational approximation to the", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 667, + 505, + 681 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 505, + 681 + ], + "score": 1.0, + "content": "information bottleneck. By enforcing a constraint on the mutual information between the input", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 680, + 505, + 691 + ], + "spans": [ + { + "bbox": [ + 106, + 680, + 505, + 691 + ], + "score": 1.0, + "content": "observations and the discriminator’s internal representation, we can encourage the discriminator", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 690, + 505, + 703 + ], + "spans": [ + { + "bbox": [ + 105, + 690, + 505, + 703 + ], + "score": 1.0, + "content": "to learn a representation that has heavy overlap between the data and the generator’s distribution,", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 702, + 505, + 713 + ], + "spans": [ + { + "bbox": [ + 106, + 702, + 505, + 713 + ], + "score": 1.0, + "content": "thereby effectively modulating the discriminator’s accuracy and maintaining useful and informative", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 194, + 506, + 207 + ], + "spans": [ + { + "bbox": [ + 105, + 194, + 506, + 207 + ], + "score": 1.0, + "content": "gradients for the generator. 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Constraining the mutual", + "type": "text", + "cross_page": true + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 227, + 505, + 239 + ], + "spans": [ + { + "bbox": [ + 105, + 227, + 505, + 239 + ], + "score": 1.0, + "content": "information between the discriminator’s internal representation and the input allows the regularizer", + "type": "text", + "cross_page": true + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 238, + 505, + 249 + ], + "spans": [ + { + "bbox": [ + 106, + 238, + 505, + 249 + ], + "score": 1.0, + "content": "to directly limit the discriminator’s accuracy, which automates the choice of noise magnitude and", + "type": "text", + "cross_page": true + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 249, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 249, + 505, + 261 + ], + "score": 1.0, + "content": "applies this noise to a compressed representation of the input that is specifically optimized to model", + "type": "text", + "cross_page": true + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 260, + 415, + 272 + ], + "spans": [ + { + "bbox": [ + 105, + 260, + 415, + 272 + ], + "score": 1.0, + "content": "the most discerning differences between the generator and data distributions.", + "type": "text", + "cross_page": true + } + ], + "index": 12 + } + ], + "index": 42.5, + "bbox_fs": [ + 105, + 645, + 505, + 713 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 108, + 86, + 502, + 138 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 108, + 86, + 502, + 138 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 108, + 86, + 502, + 138 + ], + "spans": [ + { + "bbox": [ + 108, + 86, + 502, + 138 + ], + "score": 0.958, + "type": "image", + "image_path": "79dae658a21f3a99bd5d512bd39e4ed96a241605dc27ac431de015f01936586c.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 108, + 86, + 502, + 103.33333333333333 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 108, + 103.33333333333333, + 502, + 120.66666666666666 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 108, + 120.66666666666666, + 502, + 138.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 146, + 504, + 180 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 146, + 505, + 159 + ], + "spans": [ + { + "bbox": [ + 105, + 146, + 505, + 159 + ], + "score": 1.0, + "content": "Figure 1: Our method is general and can be applied to a broad range of adversarial learning tasks.", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 104, + 156, + 505, + 171 + ], + "spans": [ + { + "bbox": [ + 104, + 156, + 505, + 171 + ], + "score": 1.0, + "content": "Left: Motion imitation with adversarial imitation learning. Middle: Image generation. Right:", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 167, + 470, + 182 + ], + "spans": [ + { + "bbox": [ + 105, + 167, + 470, + 182 + ], + "score": 1.0, + "content": "Learning transferable reward functions through adversarial inverse reinforcement learning.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4 + } + ], + "index": 2.5 + }, + { + "type": "text", + "bbox": [ + 107, + 193, + 505, + 271 + ], + "lines": [ + { + "bbox": [ + 105, + 194, + 506, + 207 + ], + "spans": [ + { + "bbox": [ + 105, + 194, + 506, + 207 + ], + "score": 1.0, + "content": "gradients for the generator. Our approach to stabilizing adversarial learning can be viewed as an", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 204, + 505, + 218 + ], + "spans": [ + { + "bbox": [ + 105, + 204, + 505, + 218 + ], + "score": 1.0, + "content": "adaptive variant of instance noise (Salimans et al., 2016; Sønderby et al., 2016; Arjovsky & Bottou,", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 215, + 505, + 228 + ], + "spans": [ + { + "bbox": [ + 105, + 215, + 505, + 228 + ], + "score": 1.0, + "content": "2017). However, we show that the adaptive nature of this method is critical. Constraining the mutual", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 227, + 505, + 239 + ], + "spans": [ + { + "bbox": [ + 105, + 227, + 505, + 239 + ], + "score": 1.0, + "content": "information between the discriminator’s internal representation and the input allows the regularizer", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 238, + 505, + 249 + ], + "spans": [ + { + "bbox": [ + 106, + 238, + 505, + 249 + ], + "score": 1.0, + "content": "to directly limit the discriminator’s accuracy, which automates the choice of noise magnitude and", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 249, + 505, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 249, + 505, + 261 + ], + "score": 1.0, + "content": "applies this noise to a compressed representation of the input that is specifically optimized to model", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 260, + 415, + 272 + ], + "spans": [ + { + "bbox": [ + 105, + 260, + 415, + 272 + ], + "score": 1.0, + "content": "the most discerning differences between the generator and data distributions.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 107, + 276, + 505, + 398 + ], + "lines": [ + { + "bbox": [ + 106, + 275, + 505, + 289 + ], + "spans": [ + { + "bbox": [ + 106, + 275, + 505, + 289 + ], + "score": 1.0, + "content": "The main contribution of this work is the variational discriminator bottleneck (VDB), an adaptive", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 288, + 506, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 506, + 300 + ], + "score": 1.0, + "content": "stochastic regularization method for adversarial learning that substantially improves performance", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 299, + 505, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 505, + 311 + ], + "score": 1.0, + "content": "across a range of different application domains, examples of which are available in Figure 1. Our", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 310, + 505, + 321 + ], + "spans": [ + { + "bbox": [ + 106, + 310, + 505, + 321 + ], + "score": 1.0, + "content": "method can be easily applied to a variety of tasks and architectures. First, we evaluate our method", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 321, + 505, + 333 + ], + "spans": [ + { + "bbox": [ + 106, + 321, + 505, + 333 + ], + "score": 1.0, + "content": "on a suite of challenging imitation tasks, including learning highly acrobatic skills from mocap data", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 332, + 505, + 343 + ], + "spans": [ + { + "bbox": [ + 106, + 332, + 505, + 343 + ], + "score": 1.0, + "content": "with a simulated humanoid character. Our method also enables characters to learn dynamic contin-", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 342, + 505, + 355 + ], + "spans": [ + { + "bbox": [ + 105, + 342, + 505, + 355 + ], + "score": 1.0, + "content": "uous control skills directly from raw video demonstrations, and drastically improves upon previous", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 353, + 505, + 366 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 505, + 366 + ], + "score": 1.0, + "content": "work that uses adversarial imitation learning. We further evaluate the effectiveness of the technique", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 364, + 505, + 377 + ], + "spans": [ + { + "bbox": [ + 105, + 364, + 505, + 377 + ], + "score": 1.0, + "content": "for inverse reinforcement learning, which recovers a reward function from demonstrations in or-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 375, + 505, + 388 + ], + "spans": [ + { + "bbox": [ + 105, + 375, + 505, + 388 + ], + "score": 1.0, + "content": "der to train future policies. Finally, we apply our framework to image generation using generative", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 387, + 457, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 387, + 457, + 399 + ], + "score": 1.0, + "content": "adversarial networks, where employing VDB improves the performance in many cases.", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 18 + }, + { + "type": "title", + "bbox": [ + 108, + 415, + 211, + 427 + ], + "lines": [ + { + "bbox": [ + 105, + 414, + 213, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 414, + 213, + 429 + ], + "score": 1.0, + "content": "2 RELATED WORK", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 440, + 505, + 671 + ], + "lines": [ + { + "bbox": [ + 106, + 441, + 505, + 453 + ], + "spans": [ + { + "bbox": [ + 106, + 441, + 505, + 453 + ], + "score": 1.0, + "content": "Recent years have seen an explosion of adversarial learning techniques, spurred by the success of", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 451, + 505, + 465 + ], + "spans": [ + { + "bbox": [ + 105, + 451, + 505, + 465 + ], + "score": 1.0, + "content": "generative adversarial networks (GANs) (Goodfellow et al., 2014). A GAN framework is commonly", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "score": 1.0, + "content": "composed of a discriminator and a generator, where the discriminator’s objective is to classify sam-", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 473, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 105, + 473, + 505, + 486 + ], + "score": 1.0, + "content": "ples as real or fake, while the generator’s objective is to produce samples that fool the discriminator.", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "Similar frameworks have also been proposed for inverse reinforcement learning (IRL) (Finn et al.,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 495, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 505, + 509 + ], + "score": 1.0, + "content": "2016b) and imitation learning (Ho & Ermon, 2016). The training of adversarial models can be ex-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "score": 1.0, + "content": "tremely unstable, with one of the most prevalent challenges being balancing the interplay between", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 516, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 105, + 516, + 506, + 531 + ], + "score": 1.0, + "content": "the discriminator and the generator (Berthelot et al., 2017). The discriminator can often overpower", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 528, + 505, + 541 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 505, + 541 + ], + "score": 1.0, + "content": "the generator, easily differentiating between real and fake samples, thus providing the generator", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "score": 1.0, + "content": "with uninformative gradients for improvement (Che et al., 2016). Alternative loss functions have", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 550, + 504, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 504, + 563 + ], + "score": 1.0, + "content": "been proposed to mitigate this problem (Mao et al., 2016; Zhao et al., 2016; Arjovsky et al., 2017).", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "score": 1.0, + "content": "Regularizers have been incorporated to improve stability and convergence, such as gradient penal-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "score": 1.0, + "content": "ties (Kodali et al., 2017; Gulrajani et al., 2017a; Mescheder et al., 2018), reconstruction loss (Che", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 582, + 505, + 597 + ], + "spans": [ + { + "bbox": [ + 104, + 582, + 505, + 597 + ], + "score": 1.0, + "content": "et al., 2016), and a myriad of other heuristics (Sønderby et al., 2016; Salimans et al., 2016; Arjovsky", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 593, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 593, + 505, + 607 + ], + "score": 1.0, + "content": "& Bottou, 2017; Berthelot et al., 2017). Task-specific architectural designs can also substantially", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 605, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 506, + 617 + ], + "score": 1.0, + "content": "improve performance (Radford et al., 2015; Karras et al., 2017). Similarly, our method also aims to", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 617, + 506, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 617, + 506, + 628 + ], + "score": 1.0, + "content": "regularize the discriminator in order to improve the feedback provided to the generator. But instead", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 626, + 505, + 640 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 505, + 640 + ], + "score": 1.0, + "content": "of explicit regularization of gradients or architecture-specific constraints, we apply a general infor-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 639, + 505, + 650 + ], + "spans": [ + { + "bbox": [ + 106, + 639, + 505, + 650 + ], + "score": 1.0, + "content": "mation bottleneck to the discriminator, which previous works have shown to encourage networks to", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 649, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 649, + 506, + 662 + ], + "score": 1.0, + "content": "ignore irrelevant cues (Achille & Soatto, 2017). We hypothesize that this then allows the generator", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 660, + 450, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 660, + 450, + 673 + ], + "score": 1.0, + "content": "to focus on improving the most discerning differences between real and fake samples.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 108, + 677, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 676, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 106, + 676, + 506, + 690 + ], + "score": 1.0, + "content": "Adversarial techniques have also been applied to inverse reinforcement learning (Fu et al., 2017),", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "where a reward function is recovered from demonstrations, which can then be used to train policies to", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "score": 1.0, + "content": "reproduce a desired skill. Finn et al. (2016a) showed an equivalence between maximum entropy IRL", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 708, + 506, + 724 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 506, + 724 + ], + "score": 1.0, + "content": "and GANs. 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Middle: Image generation. Right:", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 167, + 470, + 182 + ], + "spans": [ + { + "bbox": [ + 105, + 167, + 470, + 182 + ], + "score": 1.0, + "content": "Learning transferable reward functions through adversarial inverse reinforcement learning.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4 + } + ], + "index": 2.5 + }, + { + "type": "text", + "bbox": [ + 107, + 193, + 505, + 271 + ], + "lines": [], + "index": 9, + "bbox_fs": [ + 105, + 194, + 506, + 272 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 107, + 276, + 505, + 398 + ], + "lines": [ + { + "bbox": [ + 106, + 275, + 505, + 289 + ], + "spans": [ + { + "bbox": [ + 106, + 275, + 505, + 289 + ], + "score": 1.0, + "content": "The main contribution of this work is the variational discriminator bottleneck (VDB), an adaptive", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 288, + 506, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 506, + 300 + ], + "score": 1.0, + "content": "stochastic regularization method for adversarial learning that substantially improves performance", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 299, + 505, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 505, + 311 + ], + "score": 1.0, + "content": "across a range of different application domains, examples of which are available in Figure 1. Our", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 310, + 505, + 321 + ], + "spans": [ + { + "bbox": [ + 106, + 310, + 505, + 321 + ], + "score": 1.0, + "content": "method can be easily applied to a variety of tasks and architectures. First, we evaluate our method", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 321, + 505, + 333 + ], + "spans": [ + { + "bbox": [ + 106, + 321, + 505, + 333 + ], + "score": 1.0, + "content": "on a suite of challenging imitation tasks, including learning highly acrobatic skills from mocap data", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 332, + 505, + 343 + ], + "spans": [ + { + "bbox": [ + 106, + 332, + 505, + 343 + ], + "score": 1.0, + "content": "with a simulated humanoid character. Our method also enables characters to learn dynamic contin-", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 342, + 505, + 355 + ], + "spans": [ + { + "bbox": [ + 105, + 342, + 505, + 355 + ], + "score": 1.0, + "content": "uous control skills directly from raw video demonstrations, and drastically improves upon previous", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 353, + 505, + 366 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 505, + 366 + ], + "score": 1.0, + "content": "work that uses adversarial imitation learning. We further evaluate the effectiveness of the technique", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 364, + 505, + 377 + ], + "spans": [ + { + "bbox": [ + 105, + 364, + 505, + 377 + ], + "score": 1.0, + "content": "for inverse reinforcement learning, which recovers a reward function from demonstrations in or-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 375, + 505, + 388 + ], + "spans": [ + { + "bbox": [ + 105, + 375, + 505, + 388 + ], + "score": 1.0, + "content": "der to train future policies. Finally, we apply our framework to image generation using generative", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 387, + 457, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 387, + 457, + 399 + ], + "score": 1.0, + "content": "adversarial networks, where employing VDB improves the performance in many cases.", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 18, + "bbox_fs": [ + 105, + 275, + 506, + 399 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 415, + 211, + 427 + ], + "lines": [ + { + "bbox": [ + 105, + 414, + 213, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 414, + 213, + 429 + ], + "score": 1.0, + "content": "2 RELATED WORK", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 440, + 505, + 671 + ], + "lines": [ + { + "bbox": [ + 106, + 441, + 505, + 453 + ], + "spans": [ + { + "bbox": [ + 106, + 441, + 505, + 453 + ], + "score": 1.0, + "content": "Recent years have seen an explosion of adversarial learning techniques, spurred by the success of", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 451, + 505, + 465 + ], + "spans": [ + { + "bbox": [ + 105, + 451, + 505, + 465 + ], + "score": 1.0, + "content": "generative adversarial networks (GANs) (Goodfellow et al., 2014). A GAN framework is commonly", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "score": 1.0, + "content": "composed of a discriminator and a generator, where the discriminator’s objective is to classify sam-", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 473, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 105, + 473, + 505, + 486 + ], + "score": 1.0, + "content": "ples as real or fake, while the generator’s objective is to produce samples that fool the discriminator.", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "Similar frameworks have also been proposed for inverse reinforcement learning (IRL) (Finn et al.,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 495, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 505, + 509 + ], + "score": 1.0, + "content": "2016b) and imitation learning (Ho & Ermon, 2016). The training of adversarial models can be ex-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "score": 1.0, + "content": "tremely unstable, with one of the most prevalent challenges being balancing the interplay between", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 516, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 105, + 516, + 506, + 531 + ], + "score": 1.0, + "content": "the discriminator and the generator (Berthelot et al., 2017). The discriminator can often overpower", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 528, + 505, + 541 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 505, + 541 + ], + "score": 1.0, + "content": "the generator, easily differentiating between real and fake samples, thus providing the generator", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 540, + 505, + 551 + ], + "score": 1.0, + "content": "with uninformative gradients for improvement (Che et al., 2016). Alternative loss functions have", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 550, + 504, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 504, + 563 + ], + "score": 1.0, + "content": "been proposed to mitigate this problem (Mao et al., 2016; Zhao et al., 2016; Arjovsky et al., 2017).", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "score": 1.0, + "content": "Regularizers have been incorporated to improve stability and convergence, such as gradient penal-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 106, + 573, + 505, + 584 + ], + "score": 1.0, + "content": "ties (Kodali et al., 2017; Gulrajani et al., 2017a; Mescheder et al., 2018), reconstruction loss (Che", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 582, + 505, + 597 + ], + "spans": [ + { + "bbox": [ + 104, + 582, + 505, + 597 + ], + "score": 1.0, + "content": "et al., 2016), and a myriad of other heuristics (Sønderby et al., 2016; Salimans et al., 2016; Arjovsky", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 593, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 593, + 505, + 607 + ], + "score": 1.0, + "content": "& Bottou, 2017; Berthelot et al., 2017). Task-specific architectural designs can also substantially", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 605, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 506, + 617 + ], + "score": 1.0, + "content": "improve performance (Radford et al., 2015; Karras et al., 2017). Similarly, our method also aims to", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 617, + 506, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 617, + 506, + 628 + ], + "score": 1.0, + "content": "regularize the discriminator in order to improve the feedback provided to the generator. But instead", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 626, + 505, + 640 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 505, + 640 + ], + "score": 1.0, + "content": "of explicit regularization of gradients or architecture-specific constraints, we apply a general infor-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 639, + 505, + 650 + ], + "spans": [ + { + "bbox": [ + 106, + 639, + 505, + 650 + ], + "score": 1.0, + "content": "mation bottleneck to the discriminator, which previous works have shown to encourage networks to", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 649, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 649, + 506, + 662 + ], + "score": 1.0, + "content": "ignore irrelevant cues (Achille & Soatto, 2017). We hypothesize that this then allows the generator", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 660, + 450, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 660, + 450, + 673 + ], + "score": 1.0, + "content": "to focus on improving the most discerning differences between real and fake samples.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 35, + "bbox_fs": [ + 104, + 441, + 506, + 673 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 677, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 676, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 106, + 676, + 506, + 690 + ], + "score": 1.0, + "content": "Adversarial techniques have also been applied to inverse reinforcement learning (Fu et al., 2017),", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "where a reward function is recovered from demonstrations, which can then be used to train policies to", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "score": 1.0, + "content": "reproduce a desired skill. Finn et al. (2016a) showed an equivalence between maximum entropy IRL", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 708, + 506, + 724 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 506, + 724 + ], + "score": 1.0, + "content": "and GANs. Similar techniques have been developed for adversarial imitation learning (Ho & Ermon,", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 719, + 505, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 505, + 734 + ], + "score": 1.0, + "content": "2016; Merel et al., 2017), where agents learn to imitate demonstrations without explicitly recovering", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "a reward function. One advantage of adversarial methods is that by leveraging a discriminator in", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 505, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 505, + 105 + ], + "score": 1.0, + "content": "place of a reward function, they can be applied to imitate skills where reward functions can be", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "difficult to engineer. However, the performance of policies trained through adversarial methods still", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "score": 1.0, + "content": "falls short of those produced by manually designed reward functions, when such reward functions", + "type": "text", + "cross_page": true + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 127, + 505, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 505, + 139 + ], + "score": 1.0, + "content": "are available (Rajeswaran et al., 2017; Peng et al., 2018). We show that our method can significantly", + "type": "text", + "cross_page": true + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 138, + 505, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 505, + 150 + ], + "score": 1.0, + "content": "improve upon previous works that use adversarial techniques, and produces results of comparable", + "type": "text", + "cross_page": true + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 148, + 505, + 161 + ], + "spans": [ + { + "bbox": [ + 105, + 148, + 505, + 161 + ], + "score": 1.0, + "content": "quality to those from state-of-the-art approaches that utilize manually engineered reward functions.", + "type": "text", + "cross_page": true + } + ], + "index": 6 + } + ], + "index": 48, + "bbox_fs": [ + 105, + 676, + 506, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 160 + ], + "lines": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "a reward function. One advantage of adversarial methods is that by leveraging a discriminator in", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 505, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 505, + 105 + ], + "score": 1.0, + "content": "place of a reward function, they can be applied to imitate skills where reward functions can be", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "difficult to engineer. However, the performance of policies trained through adversarial methods still", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 505, + 128 + ], + "score": 1.0, + "content": "falls short of those produced by manually designed reward functions, when such reward functions", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 127, + 505, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 505, + 139 + ], + "score": 1.0, + "content": "are available (Rajeswaran et al., 2017; Peng et al., 2018). We show that our method can significantly", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 138, + 505, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 505, + 150 + ], + "score": 1.0, + "content": "improve upon previous works that use adversarial techniques, and produces results of comparable", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 148, + 505, + 161 + ], + "spans": [ + { + "bbox": [ + 105, + 148, + 505, + 161 + ], + "score": 1.0, + "content": "quality to those from state-of-the-art approaches that utilize manually engineered reward functions.", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 3 + }, + { + "type": "text", + "bbox": [ + 107, + 165, + 505, + 363 + ], + "lines": [ + { + "bbox": [ + 105, + 164, + 505, + 178 + ], + "spans": [ + { + "bbox": [ + 105, + 164, + 505, + 178 + ], + "score": 1.0, + "content": "Our variational discriminator bottleneck is based on the information bottleneck (Tishby & Za-", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 177, + 505, + 188 + ], + "spans": [ + { + "bbox": [ + 106, + 177, + 505, + 188 + ], + "score": 1.0, + "content": "slavsky, 2015), a technique for regularizing internal representations to minimize the mutual informa-", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 187, + 505, + 200 + ], + "spans": [ + { + "bbox": [ + 105, + 187, + 505, + 200 + ], + "score": 1.0, + "content": "tion with the input. Intuitively, a compressed representation can improve generalization by ignoring", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 199, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 106, + 199, + 505, + 210 + ], + "score": 1.0, + "content": "irrelevant distractors present in the original input. The information bottleneck can be instantiated in", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 209, + 506, + 223 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 506, + 223 + ], + "score": 1.0, + "content": "practical deep models by leveraging a variational bound and the reparameterization trick, inspired", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 219, + 505, + 234 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 505, + 234 + ], + "score": 1.0, + "content": "by a similar approach in variational autoencoders (VAE) (Kingma & Welling, 2013). The resulting", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 231, + 505, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 505, + 243 + ], + "score": 1.0, + "content": "variational information bottleneck approximates this compression effect in deep networks (Alemi", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 241, + 504, + 254 + ], + "spans": [ + { + "bbox": [ + 105, + 241, + 504, + 254 + ], + "score": 1.0, + "content": "et al., 2016; Achille & Soatto, 2017). A similar bottleneck has also been applied to learn disentan-", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 253, + 506, + 265 + ], + "spans": [ + { + "bbox": [ + 105, + 253, + 506, + 265 + ], + "score": 1.0, + "content": "gled representations (Higgins et al., 2017). Building on the success of VAEs and GANs, a number", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 264, + 505, + 276 + ], + "spans": [ + { + "bbox": [ + 106, + 264, + 505, + 276 + ], + "score": 1.0, + "content": "of efforts have been made to combine the two. Makhzani et al. (2016) used adversarial discrimina-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 275, + 504, + 286 + ], + "spans": [ + { + "bbox": [ + 106, + 275, + 504, + 286 + ], + "score": 1.0, + "content": "tors during the training of VAEs to encourage the marginal distribution of the latent encoding to be", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 286, + 505, + 299 + ], + "spans": [ + { + "bbox": [ + 105, + 286, + 505, + 299 + ], + "score": 1.0, + "content": "similar to the prior distribution, similar techniques include Mescheder et al. (2017) and Chen et al.", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 296, + 506, + 310 + ], + "spans": [ + { + "bbox": [ + 105, + 296, + 506, + 310 + ], + "score": 1.0, + "content": "(2018). Conversely, Larsen et al. (2016) modeled the generator of a GAN using a VAE. Zhao et al.", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 307, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 506, + 320 + ], + "score": 1.0, + "content": "(2016) used an autoencoder instead of a VAE to model the discriminator, but does not enforce an in-", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 318, + 506, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 506, + 331 + ], + "score": 1.0, + "content": "formation bottleneck on the encoding. While instance noise is widely used in modern architectures", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 328, + 505, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 328, + 505, + 343 + ], + "score": 1.0, + "content": "(Salimans et al., 2016; Sønderby et al., 2016; Arjovsky & Bottou, 2017), we show that explicitly", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 340, + 506, + 354 + ], + "spans": [ + { + "bbox": [ + 105, + 340, + 506, + 354 + ], + "score": 1.0, + "content": "enforcing an information bottleneck leads to improved performance over simply adding noise for a", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 352, + 200, + 364 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 200, + 364 + ], + "score": 1.0, + "content": "variety of applications.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 15.5 + }, + { + "type": "title", + "bbox": [ + 108, + 379, + 208, + 391 + ], + "lines": [ + { + "bbox": [ + 105, + 377, + 209, + 393 + ], + "spans": [ + { + "bbox": [ + 105, + 377, + 209, + 393 + ], + "score": 1.0, + "content": "3 PRELIMINARIES", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 402, + 505, + 459 + ], + "lines": [ + { + "bbox": [ + 106, + 403, + 505, + 415 + ], + "spans": [ + { + "bbox": [ + 106, + 403, + 505, + 415 + ], + "score": 1.0, + "content": "In this section, we provide a review of the variational information bottleneck proposed by Alemi", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 414, + 505, + 426 + ], + "spans": [ + { + "bbox": [ + 106, + 414, + 505, + 426 + ], + "score": 1.0, + "content": "et al. (2016) in the context of supervised learning. Our variational discriminator bottleneck is based", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 425, + 505, + 437 + ], + "spans": [ + { + "bbox": [ + 106, + 425, + 505, + 437 + ], + "score": 1.0, + "content": "on the same principle, and can be instantiated in the context of GANs, inverse RL, and imitation", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 435, + 506, + 449 + ], + "spans": [ + { + "bbox": [ + 105, + 435, + 208, + 449 + ], + "score": 1.0, + "content": "learning. Given a dataset", + "type": "text" + }, + { + "bbox": [ + 208, + 436, + 242, + 448 + ], + "score": 0.93, + "content": "\\left\\{ \\mathbf { x } _ { i } , \\mathbf { y } _ { i } \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 242, + 435, + 299, + 449 + ], + "score": 1.0, + "content": ", with features", + "type": "text" + }, + { + "bbox": [ + 300, + 437, + 311, + 447 + ], + "score": 0.86, + "content": "\\mathbf { x } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 435, + 354, + 449 + ], + "score": 1.0, + "content": "and labels", + "type": "text" + }, + { + "bbox": [ + 354, + 438, + 365, + 447 + ], + "score": 0.86, + "content": "\\mathbf { y } _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 435, + 506, + 449 + ], + "score": 1.0, + "content": ", the standard maximum likelihood", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 447, + 307, + 461 + ], + "spans": [ + { + "bbox": [ + 105, + 447, + 142, + 461 + ], + "score": 1.0, + "content": "estimate", + "type": "text" + }, + { + "bbox": [ + 142, + 447, + 177, + 459 + ], + "score": 0.93, + "content": "q ( \\mathbf { y } _ { i } | \\mathbf { x } _ { i } )", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 447, + 307, + 461 + ], + "score": 1.0, + "content": "can be determined according to", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 28 + }, + { + "type": "interline_equation", + "bbox": [ + 235, + 462, + 374, + 480 + ], + "lines": [ + { + "bbox": [ + 235, + 462, + 374, + 480 + ], + "spans": [ + { + "bbox": [ + 235, + 462, + 374, + 480 + ], + "score": 0.92, + "content": "\\operatorname* { m i n } _ { \\boldsymbol { q } } \\quad \\mathbb { E } _ { \\mathbf { x } , \\mathbf { y } \\sim p ( \\mathbf { x } , \\mathbf { y } ) } \\left[ - \\log q ( \\mathbf { y } | \\mathbf { x } ) \\right] .", + "type": "interline_equation", + "image_path": "c35092374e07c47b5339c649b21f87d8f7ac11e0b2320e9cc1e9905bf0f41781.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 235, + 462, + 374, + 480 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 483, + 505, + 561 + ], + "lines": [ + { + "bbox": [ + 106, + 483, + 504, + 496 + ], + "spans": [ + { + "bbox": [ + 106, + 483, + 504, + 496 + ], + "score": 1.0, + "content": "Unfortunately, this estimate is prone to overfitting, and the resulting model can often exploit idiosyn-", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 494, + 505, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 494, + 505, + 507 + ], + "score": 1.0, + "content": "crasies in the data (Krizhevsky et al., 2012; Srivastava et al., 2014). Alemi et al. (2016) proposed", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 506, + 505, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 505, + 518 + ], + "score": 1.0, + "content": "regularizing the model using an information bottleneck to encourage the model to focus only on the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 517, + 505, + 529 + ], + "spans": [ + { + "bbox": [ + 105, + 517, + 505, + 529 + ], + "score": 1.0, + "content": "most discriminative features. 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Building on the success of VAEs and GANs, a number", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 264, + 505, + 276 + ], + "spans": [ + { + "bbox": [ + 106, + 264, + 505, + 276 + ], + "score": 1.0, + "content": "of efforts have been made to combine the two. Makhzani et al. (2016) used adversarial discrimina-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 275, + 504, + 286 + ], + "spans": [ + { + "bbox": [ + 106, + 275, + 504, + 286 + ], + "score": 1.0, + "content": "tors during the training of VAEs to encourage the marginal distribution of the latent encoding to be", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 286, + 505, + 299 + ], + "spans": [ + { + "bbox": [ + 105, + 286, + 505, + 299 + ], + "score": 1.0, + "content": "similar to the prior distribution, similar techniques include Mescheder et al. 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A schematic illustration of the framework", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 513, + 474, + 527 + ], + "spans": [ + { + "bbox": [ + 104, + 513, + 307, + 527 + ], + "score": 1.0, + "content": "is available in Figure 2. 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The regularized objective", + "type": "text" + }, + { + "bbox": [ + 307, + 513, + 343, + 525 + ], + "score": 0.93, + "content": "J ( D , E )", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 513, + 474, + 527 + ], + "score": 1.0, + "content": "for the discriminator is given by", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 22, + "bbox_fs": [ + 104, + 469, + 506, + 527 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 529, + 504, + 568 + ], + "lines": [ + { + "bbox": [ + 111, + 529, + 504, + 568 + ], + "spans": [ + { + "bbox": [ + 111, + 529, + 504, + 568 + ], + "score": 0.91, + "content": "\\begin{array} { r l } { J ( D , E ) = \\underset { D , E } { \\operatorname* { m i n } } } & { \\mathbb { E } _ { x \\sim p ^ { * } ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( D ( \\mathbf { z } ) \\right) \\right] \\right] + \\mathbb { E } _ { \\mathbf { x } \\sim G ( \\mathbf { x } ) } \\left[ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { x } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { z } ) \\right) \\right] \\right] } \\\\ { \\mathrm { s . t . } } & { \\mathbb { E } _ { \\mathbf { x } \\sim \\tilde { p } ( \\mathbf { x } ) } \\left[ \\mathrm { K L } \\left[ E ( \\mathbf { z } | \\mathbf { x } ) | | r ( \\mathbf { z } ) \\right] \\right] \\leq I _ { c } , } \\end{array}", + "type": "interline_equation", + "image_path": "db89319b4bc15a32f1fab3822a2aa5b17a7b0f55c0751a48c8d38dcd7f3a6830.jpg" + } + ] + } + ], + "index": 26, + "virtual_lines": [ + { + "bbox": [ + 111, + 529, + 504, + 542.0 + ], + "spans": [], + "index": 25 + }, + { + "bbox": [ + 111, + 542.0, + 504, + 555.0 + ], + "spans": [], + "index": 26 + }, + { + "bbox": [ + 111, + 555.0, + 504, + 568.0 + ], + "spans": [], + "index": 27 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 574, + 507, + 608 + ], + "lines": [ + { + "bbox": [ + 105, + 574, + 505, + 588 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 127, + 587 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 128, + 574, + 192, + 588 + ], + "score": 0.93, + "content": "\\tilde { p } = { \\textstyle \\frac { 1 } { 2 } } p ^ { * } + { \\textstyle \\frac { 1 } { 2 } } G", + "type": "inline_equation" + }, + { + "bbox": [ + 192, + 574, + 505, + 587 + ], + "score": 1.0, + "content": "being a mixture of the target distribution and the generator. 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Instead of computing the expecta-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 257, + 505, + 270 + ], + "spans": [ + { + "bbox": [ + 105, + 257, + 144, + 270 + ], + "score": 1.0, + "content": "tion over", + "type": "text" + }, + { + "bbox": [ + 144, + 258, + 153, + 268 + ], + "score": 0.76, + "content": "Z", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 257, + 392, + 270 + ], + "score": 1.0, + "content": ", we found that approximating the expectation by evaluating", + "type": "text" + }, + { + "bbox": [ + 392, + 258, + 402, + 268 + ], + "score": 0.83, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 402, + 257, + 451, + 270 + ], + "score": 1.0, + "content": "at the mean", + "type": "text" + }, + { + "bbox": [ + 451, + 258, + 478, + 269 + ], + "score": 0.92, + "content": "\\mu _ { E } ( { \\bf x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 479, + 257, + 505, + 270 + ], + "score": 1.0, + "content": "of the", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 269, + 505, + 281 + ], + "spans": [ + { + "bbox": [ + 106, + 269, + 505, + 281 + ], + "score": 1.0, + "content": "encoder’s distribution was sufficient for our tasks. The discriminator is modeled with a single linear", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 279, + 442, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 279, + 216, + 292 + ], + "score": 1.0, + "content": "unit followed by a sigmoid", + "type": "text" + }, + { + "bbox": [ + 216, + 279, + 312, + 292 + ], + "score": 0.93, + "content": "D ( \\mathbf { z } ) = \\sigma ( \\mathbf { w } _ { D } ^ { T } \\mathbf { z } + \\mathbf { b } _ { D } )", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 279, + 369, + 292 + ], + "score": 1.0, + "content": ", with weights", + "type": "text" + }, + { + "bbox": [ + 370, + 281, + 386, + 290 + ], + "score": 0.87, + "content": "\\mathbf { w } _ { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 279, + 423, + 292 + ], + "score": 1.0, + "content": "and bias", + "type": "text" + }, + { + "bbox": [ + 423, + 280, + 437, + 290 + ], + "score": 0.89, + "content": "\\mathbf { b } _ { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 279, + 442, + 292 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 14.5 + }, + { + "type": "title", + "bbox": [ + 108, + 304, + 252, + 315 + ], + "lines": [ + { + "bbox": [ + 105, + 302, + 254, + 317 + ], + "spans": [ + { + "bbox": [ + 105, + 302, + 254, + 317 + ], + "score": 1.0, + "content": "4.1 DISCUSSION AND ANALYSIS", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 17 + }, + { + "type": "text", + "bbox": [ + 106, + 324, + 505, + 533 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 505, + 337 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 505, + 337 + ], + "score": 1.0, + "content": "To interpret the effects of the VDB, we consider the results presented by Arjovsky & Bottou (2017),", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 335, + 504, + 348 + ], + "spans": [ + { + "bbox": [ + 106, + 335, + 504, + 348 + ], + "score": 1.0, + "content": "which show that for two distributions with disjoint support, the optimal discriminator can perfectly", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 346, + 505, + 359 + ], + "spans": [ + { + "bbox": [ + 105, + 346, + 505, + 359 + ], + "score": 1.0, + "content": "classify all samples and its gradients will be zero almost everywhere. Thus, as the discriminator con-", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 357, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 505, + 370 + ], + "score": 1.0, + "content": "verges to the optimum, the gradients for the generator vanishes accordingly. To address this issue,", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 367, + 505, + 382 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 505, + 382 + ], + "score": 1.0, + "content": "Arjovsky & Bottou (2017) proposed applying continuous noise to the discriminator inputs, thereby", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 379, + 505, + 392 + ], + "spans": [ + { + "bbox": [ + 105, + 379, + 505, + 392 + ], + "score": 1.0, + "content": "ensuring that the distributions have continuous support everywhere. In practice, if the original dis-", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 390, + 505, + 402 + ], + "spans": [ + { + "bbox": [ + 106, + 390, + 505, + 402 + ], + "score": 1.0, + "content": "tributions are sufficiently distant from each other, the added noise will have negligible effects. As", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 402, + 505, + 413 + ], + "spans": [ + { + "bbox": [ + 106, + 402, + 505, + 413 + ], + "score": 1.0, + "content": "shown by Mescheder et al. (2017), the optimal choice for the variance of the noise to ensure con-", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 411, + 506, + 425 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 506, + 425 + ], + "score": 1.0, + "content": "vergence can be quite delicate. In our method, by first using a learned encoder to map the inputs to", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 424, + 505, + 436 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 505, + 436 + ], + "score": 1.0, + "content": "an embedding and then applying an information bottleneck on the embedding, we can dynamically", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 433, + 505, + 447 + ], + "spans": [ + { + "bbox": [ + 105, + 433, + 505, + 447 + ], + "score": 1.0, + "content": "adjust the variance of the noise such that the distributions not only share support in the embedding", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 445, + 506, + 458 + ], + "spans": [ + { + "bbox": [ + 104, + 445, + 506, + 458 + ], + "score": 1.0, + "content": "space, but also have significant overlap. Since the minimum amount of information required for", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 456, + 505, + 469 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 375, + 469 + ], + "score": 1.0, + "content": "binary classification is 1 bit, by selecting an information constraint", + "type": "text" + }, + { + "bbox": [ + 375, + 456, + 403, + 467 + ], + "score": 0.91, + "content": "I _ { c } < 1 ", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 456, + 505, + 469 + ], + "score": 1.0, + "content": ", the discriminator is pre-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 467, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 106, + 467, + 505, + 479 + ], + "score": 1.0, + "content": "vented from from perfectly differentiating between the distributions. To illustrate the effects of the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 478, + 504, + 489 + ], + "spans": [ + { + "bbox": [ + 106, + 478, + 504, + 489 + ], + "score": 1.0, + "content": "VDB, we consider a simple task of training a discriminator to differentiate between two Gaussian", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 488, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 488, + 465, + 501 + ], + "score": 1.0, + "content": "distributions. Figure 2 visualizes the decision boundaries learned with different bounds", + "type": "text" + }, + { + "bbox": [ + 465, + 489, + 475, + 500 + ], + "score": 0.87, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 476, + 488, + 505, + 501 + ], + "score": 1.0, + "content": "on the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 499, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 505, + 513 + ], + "score": 1.0, + "content": "mutual information. Without a VDB, the discriminator learns a sharp decision boundary, resulting in", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 306, + 523 + ], + "score": 1.0, + "content": "vanishing gradients for much of the space. But as", + "type": "text" + }, + { + "bbox": [ + 307, + 511, + 317, + 522 + ], + "score": 0.87, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 511, + 505, + 523 + ], + "score": 1.0, + "content": "decreases and the bound tightens, the decision", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 522, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 522, + 505, + 535 + ], + "score": 1.0, + "content": "boundary is smoothed, providing more informative gradients that can be leveraged by the generator.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 27 + }, + { + "type": "text", + "bbox": [ + 106, + 538, + 505, + 638 + ], + "lines": [ + { + "bbox": [ + 106, + 538, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 538, + 505, + 551 + ], + "score": 1.0, + "content": "Taking this analysis further, we can extend Theorem 3.2 from Arjovsky & Bottou (2017) to analyze", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 549, + 505, + 562 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 505, + 562 + ], + "score": 1.0, + "content": "the VDB, and show that the gradient of the generator will be non-degenerate for a small enough", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 561, + 505, + 573 + ], + "spans": [ + { + "bbox": [ + 106, + 561, + 149, + 573 + ], + "score": 1.0, + "content": "constraint", + "type": "text" + }, + { + "bbox": [ + 149, + 561, + 159, + 572 + ], + "score": 0.86, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 159, + 561, + 505, + 573 + ], + "score": 1.0, + "content": ", under some additional simplifying assumptions. 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This", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 604, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 106, + 604, + 506, + 617 + ], + "score": 1.0, + "content": "can still cause the generator gradient to vanish. In the case of the VDB, the constraint ensures that", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 614, + 505, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 614, + 505, + 628 + ], + "score": 1.0, + "content": "these coefficients are always bounded below. 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Figure 2 visualizes the decision boundaries learned with different bounds", + "type": "text" + }, + { + "bbox": [ + 465, + 489, + 475, + 500 + ], + "score": 0.87, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 476, + 488, + 505, + 501 + ], + "score": 1.0, + "content": "on the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 499, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 499, + 505, + 513 + ], + "score": 1.0, + "content": "mutual information. Without a VDB, the discriminator learns a sharp decision boundary, resulting in", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 306, + 523 + ], + "score": 1.0, + "content": "vanishing gradients for much of the space. But as", + "type": "text" + }, + { + "bbox": [ + 307, + 511, + 317, + 522 + ], + "score": 0.87, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 511, + 505, + 523 + ], + "score": 1.0, + "content": "decreases and the bound tightens, the decision", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 522, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 522, + 505, + 535 + ], + "score": 1.0, + "content": "boundary is smoothed, providing more informative gradients that can be leveraged by the generator.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 27, + "bbox_fs": [ + 104, + 324, + 506, + 535 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 538, + 505, + 638 + ], + "lines": [ + { + "bbox": [ + 106, + 538, + 505, + 551 + ], + "spans": [ + { + "bbox": [ + 106, + 538, + 505, + 551 + ], + "score": 1.0, + "content": "Taking this analysis further, we can extend Theorem 3.2 from Arjovsky & Bottou (2017) to analyze", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 549, + 505, + 562 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 505, + 562 + ], + "score": 1.0, + "content": "the VDB, and show that the gradient of the generator will be non-degenerate for a small enough", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 561, + 505, + 573 + ], + "spans": [ + { + "bbox": [ + 106, + 561, + 149, + 573 + ], + "score": 1.0, + "content": "constraint", + "type": "text" + }, + { + "bbox": [ + 149, + 561, + 159, + 572 + ], + "score": 0.86, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 159, + 561, + 505, + 573 + ], + "score": 1.0, + "content": ", under some additional simplifying assumptions. The result in Arjovsky & Bottou", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 572, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 106, + 572, + 505, + 584 + ], + "score": 1.0, + "content": "(2017) states that the gradient consists of vectors that point toward samples on the data manifold,", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 582, + 505, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 505, + 595 + ], + "score": 1.0, + "content": "multiplied by coefficients that depend on the noise. However, these coefficients may be arbitrarily", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 593, + 506, + 606 + ], + "spans": [ + { + "bbox": [ + 105, + 593, + 506, + 606 + ], + "score": 1.0, + "content": "small if the generated samples are far from real samples, and the noise is not large enough. This", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 604, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 106, + 604, + 506, + 617 + ], + "score": 1.0, + "content": "can still cause the generator gradient to vanish. In the case of the VDB, the constraint ensures that", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 614, + 505, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 614, + 505, + 628 + ], + "score": 1.0, + "content": "these coefficients are always bounded below. Due to space constraints, this result is presented in", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 626, + 161, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 161, + 639 + ], + "score": 1.0, + "content": "Appendix A.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 41, + "bbox_fs": [ + 105, + 538, + 506, + 639 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 650, + 383, + 662 + ], + "lines": [ + { + "bbox": [ + 106, + 650, + 384, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 650, + 384, + 663 + ], + "score": 1.0, + "content": "4.2 VAIL: VARIATIONAL ADVERSARIAL IMITATION LEARNING", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 46 + }, + { + "type": "text", + "bbox": [ + 107, + 671, + 505, + 716 + ], + "lines": [ + { + "bbox": [ + 105, + 670, + 505, + 684 + ], + "spans": [ + { + "bbox": [ + 105, + 670, + 505, + 684 + ], + "score": 1.0, + "content": "To extend the VDB to imitation learning, we start with the generative adversarial imitation learning", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 682, + 504, + 693 + ], + "spans": [ + { + "bbox": [ + 106, + 682, + 504, + 693 + ], + "score": 1.0, + "content": "(GAIL) framework (Ho & Ermon, 2016), where the discriminator’s objective is to differentiate be-", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 693, + 505, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 693, + 322, + 705 + ], + "score": 1.0, + "content": "tween the state distribution induced by a target policy", + "type": "text" + }, + { + "bbox": [ + 322, + 693, + 346, + 705 + ], + "score": 0.91, + "content": "\\pi ^ { * } ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 693, + 505, + 705 + ], + "score": 1.0, + "content": "and the state distribution of the agent’s", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 703, + 158, + 717 + ], + "spans": [ + { + "bbox": [ + 105, + 703, + 133, + 717 + ], + "score": 1.0, + "content": "policy", + "type": "text" + }, + { + "bbox": [ + 134, + 704, + 153, + 716 + ], + "score": 0.89, + "content": "\\pi ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 703, + 158, + 717 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 50 + } + ], + "index": 48.5, + "bbox_fs": [ + 105, + 670, + 505, + 717 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 170, + 717, + 439, + 735 + ], + "lines": [ + { + "bbox": [ + 170, + 717, + 439, + 735 + ], + "spans": [ + { + "bbox": [ + 170, + 717, + 439, + 735 + ], + "score": 0.87, + "content": "\\operatorname* { m a x } _ { \\pi } \\operatorname* { m i n } _ { D } \\quad \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ^ { * } ( \\mathbf { s } ) } \\left[ - \\log \\left( D ( \\mathbf { s } ) \\right) \\right] + \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } \\left[ - \\log \\left( 1 - D ( \\mathbf { s } ) \\right) \\right] .", + "type": "interline_equation", + "image_path": "fee895b2e56214553f95a0fc70340c18a66373dca51679b1e745aba34bcc7d4f.jpg" + } + ] + } + ], + "index": 51, + "virtual_lines": [ + { + "bbox": [ + 170, + 717, + 439, + 735 + ], + "spans": [], + "index": 51 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 109, + 85, + 502, + 201 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 109, + 85, + 502, + 201 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 109, + 85, + 502, + 201 + ], + "spans": [ + { + "bbox": [ + 109, + 85, + 502, + 201 + ], + "score": 0.97, + "type": "image", + "image_path": "30d57dddd51de39696f83d45f9cb8ba9fe5f6258906497db5bb38f50fa1a90ca.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 109, + 85, + 502, + 123.66666666666666 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 109, + 123.66666666666666, + 502, + 162.33333333333331 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 109, + 162.33333333333331, + 502, + 200.99999999999997 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 105, + 205, + 504, + 228 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 204, + 505, + 219 + ], + "spans": [ + { + "bbox": [ + 105, + 204, + 505, + 219 + ], + "score": 1.0, + "content": "Figure 3: Simulated humanoid performing various skills. VAIL is able to closely imitate a broad", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 216, + 238, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 238, + 229 + ], + "score": 1.0, + "content": "range of skills from mocap data.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + } + ], + "index": 2.25 + }, + { + "type": "text", + "bbox": [ + 106, + 242, + 506, + 298 + ], + "lines": [ + { + "bbox": [ + 106, + 242, + 505, + 255 + ], + "spans": [ + { + "bbox": [ + 106, + 242, + 505, + 255 + ], + "score": 1.0, + "content": "The discriminator is trained to maximize the likelihood assigned to states from the target policy,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 254, + 505, + 266 + ], + "spans": [ + { + "bbox": [ + 106, + 254, + 505, + 266 + ], + "score": 1.0, + "content": "while minimizing the likelihood assigned to states from the agent’s policy. The discriminator also", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 264, + 505, + 277 + ], + "spans": [ + { + "bbox": [ + 105, + 264, + 505, + 277 + ], + "score": 1.0, + "content": "serves as the reward function for the agent, which encourages the policy to visit states that, to the", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 275, + 505, + 287 + ], + "spans": [ + { + "bbox": [ + 106, + 275, + 505, + 287 + ], + "score": 1.0, + "content": "discriminator, appear indistinguishable from the demonstrations. Similar to the GAN framework,", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 287, + 305, + 299 + ], + "spans": [ + { + "bbox": [ + 106, + 287, + 305, + 299 + ], + "score": 1.0, + "content": "we can incorporate a VDB into the discriminator,", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 7 + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 303, + 510, + 342 + ], + "lines": [ + { + "bbox": [ + 111, + 303, + 510, + 342 + ], + "spans": [ + { + "bbox": [ + 111, + 303, + 510, + 342 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { I ( D , E ) = \\underset { D , E } { \\mathrm { m i n } } \\underset { \\beta \\geq 0 } { \\mathrm { m a x } } \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ^ { * } ( \\mathbf { s } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } ) } [ - \\log ( D ( \\mathbf { z } ) ) ] ] + \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } ) } [ - \\log ( 1 - D ( \\mathbf { z } ) ) ] ] } \\\\ & { \\qquad + \\beta ( \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } [ \\mathrm { K L } [ E ( \\mathbf { z } \\mid \\mathbf { s } ) ] \\mid \\mid r ( \\mathbf { z } ) ] ] - I _ { c } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "7a608c25030359564f767e572f40eab5f02e5e0786cfa5078532a61af3ce54d6.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 111, + 303, + 510, + 316.0 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 111, + 316.0, + 510, + 329.0 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 111, + 329.0, + 510, + 342.0 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 349, + 507, + 384 + ], + "lines": [ + { + "bbox": [ + 105, + 348, + 506, + 363 + ], + "spans": [ + { + "bbox": [ + 105, + 348, + 133, + 363 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 349, + 198, + 363 + ], + "score": 0.93, + "content": "\\tilde { \\pi } = { \\textstyle \\frac { 1 } { 2 } } \\pi ^ { * } + { \\textstyle \\frac { 1 } { 2 } } \\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 348, + 506, + 363 + ], + "score": 1.0, + "content": "represents a mixture of the target policy and the agent’s policy. The reward", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 120, + 373 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 121, + 363, + 128, + 371 + ], + "score": 0.78, + "content": "\\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 129, + 360, + 280, + 373 + ], + "score": 1.0, + "content": "is then specified by the discriminator", + "type": "text" + }, + { + "bbox": [ + 280, + 361, + 391, + 373 + ], + "score": 0.92, + "content": "r _ { t } = - \\mathrm { l o g } \\bar { ( 1 - D ( \\mu _ { E } ( \\mathbf { s } ) ) ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 360, + 506, + 373 + ], + "score": 1.0, + "content": ". We refer to this method as", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 372, + 304, + 384 + ], + "spans": [ + { + "bbox": [ + 106, + 372, + 304, + 384 + ], + "score": 1.0, + "content": "variational adversarial imitation learning (VAIL).", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14 + }, + { + "type": "title", + "bbox": [ + 105, + 398, + 460, + 410 + ], + "lines": [ + { + "bbox": [ + 105, + 397, + 461, + 410 + ], + "spans": [ + { + "bbox": [ + 105, + 397, + 461, + 410 + ], + "score": 1.0, + "content": "4.3 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 16 + }, + { + "type": "text", + "bbox": [ + 107, + 418, + 506, + 453 + ], + "lines": [ + { + "bbox": [ + 106, + 418, + 505, + 432 + ], + "spans": [ + { + "bbox": [ + 106, + 418, + 505, + 432 + ], + "score": 1.0, + "content": "The VDB can also be applied to adversarial inverse reinforcement learning (Fu et al., 2017) to yield a", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 430, + 505, + 443 + ], + "spans": [ + { + "bbox": [ + 106, + 430, + 505, + 443 + ], + "score": 1.0, + "content": "new algorithm which we call variational adversarial inverse reinforcement learning (VAIRL). AIRL", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 442, + 406, + 453 + ], + "spans": [ + { + "bbox": [ + 106, + 442, + 406, + 453 + ], + "score": 1.0, + "content": "operates in a similar manner to GAIL, but with a discriminator of the form", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18 + }, + { + "type": "interline_equation", + "bbox": [ + 220, + 459, + 389, + 486 + ], + "lines": [ + { + "bbox": [ + 220, + 459, + 389, + 486 + ], + "spans": [ + { + "bbox": [ + 220, + 459, + 389, + 486 + ], + "score": 0.95, + "content": "D ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) = \\frac { \\exp \\left( f ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) \\right) } { \\exp \\left( f ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) \\right) + \\pi ( { \\bf a } | { \\bf s } ) } ,", + "type": "interline_equation", + "image_path": "7212ad8fa14e280e84e215b3c1ebb3635bdd15a3d80df61875e40e7c9f5fa2cb.jpg" + } + ] + } + ], + "index": 20.5, + "virtual_lines": [ + { + "bbox": [ + 220, + 459, + 389, + 472.5 + ], + "spans": [], + "index": 20 + }, + { + "bbox": [ + 220, + 472.5, + 389, + 486.0 + ], + "spans": [], + "index": 21 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 491, + 506, + 581 + ], + "lines": [ + { + "bbox": [ + 106, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 106, + 492, + 134, + 505 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 492, + 287, + 505 + ], + "score": 0.93, + "content": "f ( \\mathbf { s } , \\mathbf { a } , \\mathbf { s } ^ { \\prime } ) = g ( \\mathbf { s } , \\mathbf { a } ) + \\gamma h ( \\mathbf { s } ^ { \\prime } ) - h ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 492, + 312, + 505 + ], + "score": 1.0, + "content": ", with", + "type": "text" + }, + { + "bbox": [ + 312, + 495, + 319, + 504 + ], + "score": 0.81, + "content": "g", + "type": "inline_equation" + }, + { + "bbox": [ + 319, + 492, + 337, + 505 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 338, + 493, + 345, + 502 + ], + "score": 0.81, + "content": "h", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "being learned functions. Under certain", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 504, + 506, + 516 + ], + "spans": [ + { + "bbox": [ + 105, + 504, + 317, + 516 + ], + "score": 1.0, + "content": "restrictions on the environment, Fu et al. show that if", + "type": "text" + }, + { + "bbox": [ + 317, + 504, + 345, + 515 + ], + "score": 0.92, + "content": "g ( \\mathbf { s } , \\mathbf { a } )", + "type": "inline_equation" + }, + { + "bbox": [ + 346, + 504, + 506, + 516 + ], + "score": 1.0, + "content": "is defined to depend only on the current", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 514, + 505, + 527 + ], + "spans": [ + { + "bbox": [ + 105, + 514, + 186, + 527 + ], + "score": 1.0, + "content": "state s, the optimal", + "type": "text" + }, + { + "bbox": [ + 186, + 514, + 205, + 527 + ], + "score": 0.9, + "content": "g ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 514, + 377, + 527 + ], + "score": 1.0, + "content": "recovers the expert’s true reward function", + "type": "text" + }, + { + "bbox": [ + 378, + 514, + 400, + 527 + ], + "score": 0.93, + "content": "r ^ { * } ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 514, + 469, + 527 + ], + "score": 1.0, + "content": "up to a constant", + "type": "text" + }, + { + "bbox": [ + 469, + 514, + 505, + 527 + ], + "score": 0.91, + "content": "g ^ { * } ( \\mathbf { s } ) =", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 525, + 505, + 538 + ], + "spans": [ + { + "bbox": [ + 106, + 525, + 163, + 537 + ], + "score": 0.7, + "content": "r ^ { * } ( \\mathbf { s } ) + \\mathrm { c o n s i }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 525, + 505, + 538 + ], + "score": 1.0, + "content": ". In this case, the learned reward can be re-used to train policies in environments with", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 536, + 506, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 506, + 549 + ], + "score": 1.0, + "content": "different dynamics, and will yield the same policy as if the policy was trained under the expert’s", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 547, + 505, + 559 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 491, + 559 + ], + "score": 1.0, + "content": "true reward. In contrast, GAIL’s discriminator typically cannot be re-optimized in this way", + "type": "text" + }, + { + "bbox": [ + 491, + 548, + 505, + 558 + ], + "score": 0.49, + "content": "\\mathrm { F u }", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 557, + 505, + 572 + ], + "spans": [ + { + "bbox": [ + 105, + 557, + 337, + 572 + ], + "score": 1.0, + "content": "et al., 2017). In VAIRL, we introduce stochastic encoders", + "type": "text" + }, + { + "bbox": [ + 337, + 558, + 417, + 571 + ], + "score": 0.9, + "content": "E _ { g } ( \\mathbf { z } _ { g } | \\mathbf { s } ) , E _ { h } ( \\mathbf { z } _ { h } | \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 557, + 437, + 572 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 438, + 558, + 489, + 570 + ], + "score": 0.93, + "content": "g ( \\mathbf { z } _ { g } ) , h ( \\mathbf { z } _ { h } )", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 557, + 505, + 572 + ], + "score": 1.0, + "content": "are", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 569, + 417, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 417, + 581 + ], + "score": 1.0, + "content": "modified to be functions of the encoding. We can reformulate Equation 13 as", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 25.5 + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 586, + 394, + 614 + ], + "lines": [ + { + "bbox": [ + 215, + 586, + 394, + 614 + ], + "spans": [ + { + "bbox": [ + 215, + 586, + 394, + 614 + ], + "score": 0.94, + "content": "D ( { \\bf s } , { \\bf a } , { \\bf z } ) = \\frac { \\exp \\left( f ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } ) \\right) } { \\exp \\left( f ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } ) \\right) + \\pi ( { \\bf a } | { \\bf s } ) } ,", + "type": "interline_equation", + "image_path": "c1dca0371bef123778f4f080d879166ca195632e96802ff6f086b8a42f2f8f6d.jpg" + } + ] + } + ], + "index": 30.5, + "virtual_lines": [ + { + "bbox": [ + 215, + 586, + 394, + 600.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 215, + 600.0, + 394, + 614.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 621, + 505, + 644 + ], + "lines": [ + { + "bbox": [ + 105, + 619, + 506, + 635 + ], + "spans": [ + { + "bbox": [ + 105, + 619, + 120, + 635 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 121, + 621, + 187, + 633 + ], + "score": 0.92, + "content": "{ \\bf z } = ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } )", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 619, + 204, + 635 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 205, + 621, + 394, + 634 + ], + "score": 0.92, + "content": "f ( \\mathbf { z } _ { g } , \\mathbf { z } _ { h } , \\mathbf { z } _ { h } ^ { \\prime } ) = D _ { g } ( \\mathbf { z } _ { g } ) + \\gamma D _ { h } ( \\mathbf { z } _ { h } ^ { \\prime } ) - D _ { h } ( \\mathbf { z } _ { h } )", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 619, + 506, + 635 + ], + "score": 1.0, + "content": ". 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VAIL is able to closely imitate a broad", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 216, + 238, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 238, + 229 + ], + "score": 1.0, + "content": "range of skills from mocap data.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + } + ], + "index": 2.25 + }, + { + "type": "text", + "bbox": [ + 106, + 242, + 506, + 298 + ], + "lines": [ + { + "bbox": [ + 106, + 242, + 505, + 255 + ], + "spans": [ + { + "bbox": [ + 106, + 242, + 505, + 255 + ], + "score": 1.0, + "content": "The discriminator is trained to maximize the likelihood assigned to states from the target policy,", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 254, + 505, + 266 + ], + "spans": [ + { + "bbox": [ + 106, + 254, + 505, + 266 + ], + "score": 1.0, + "content": "while minimizing the likelihood assigned to states from the agent’s policy. The discriminator also", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 264, + 505, + 277 + ], + "spans": [ + { + "bbox": [ + 105, + 264, + 505, + 277 + ], + "score": 1.0, + "content": "serves as the reward function for the agent, which encourages the policy to visit states that, to the", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 275, + 505, + 287 + ], + "spans": [ + { + "bbox": [ + 106, + 275, + 505, + 287 + ], + "score": 1.0, + "content": "discriminator, appear indistinguishable from the demonstrations. Similar to the GAN framework,", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 287, + 305, + 299 + ], + "spans": [ + { + "bbox": [ + 106, + 287, + 305, + 299 + ], + "score": 1.0, + "content": "we can incorporate a VDB into the discriminator,", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 7, + "bbox_fs": [ + 105, + 242, + 505, + 299 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 303, + 510, + 342 + ], + "lines": [ + { + "bbox": [ + 111, + 303, + 510, + 342 + ], + "spans": [ + { + "bbox": [ + 111, + 303, + 510, + 342 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { I ( D , E ) = \\underset { D , E } { \\mathrm { m i n } } \\underset { \\beta \\geq 0 } { \\mathrm { m a x } } \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ^ { * } ( \\mathbf { s } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } ) } [ - \\log ( D ( \\mathbf { z } ) ) ] ] + \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } [ \\mathbb { E } _ { \\mathbf { z } \\sim E ( \\mathbf { z } \\mid \\mathbf { s } ) } [ - \\log ( 1 - D ( \\mathbf { z } ) ) ] ] } \\\\ & { \\qquad + \\beta ( \\mathbb { E } _ { \\mathbf { s } \\sim \\pi ( \\mathbf { s } ) } [ \\mathrm { K L } [ E ( \\mathbf { z } \\mid \\mathbf { s } ) ] \\mid \\mid r ( \\mathbf { z } ) ] ] - I _ { c } ) . } \\end{array}", + "type": "interline_equation", + "image_path": "7a608c25030359564f767e572f40eab5f02e5e0786cfa5078532a61af3ce54d6.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 111, + 303, + 510, + 316.0 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 111, + 316.0, + 510, + 329.0 + ], + "spans": [], + "index": 11 + }, + { + "bbox": [ + 111, + 329.0, + 510, + 342.0 + ], + "spans": [], + "index": 12 + } + ] + }, + { + "type": "text", + "bbox": [ + 108, + 349, + 507, + 384 + ], + "lines": [ + { + "bbox": [ + 105, + 348, + 506, + 363 + ], + "spans": [ + { + "bbox": [ + 105, + 348, + 133, + 363 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 349, + 198, + 363 + ], + "score": 0.93, + "content": "\\tilde { \\pi } = { \\textstyle \\frac { 1 } { 2 } } \\pi ^ { * } + { \\textstyle \\frac { 1 } { 2 } } \\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 348, + 506, + 363 + ], + "score": 1.0, + "content": "represents a mixture of the target policy and the agent’s policy. The reward", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 120, + 373 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 121, + 363, + 128, + 371 + ], + "score": 0.78, + "content": "\\pi", + "type": "inline_equation" + }, + { + "bbox": [ + 129, + 360, + 280, + 373 + ], + "score": 1.0, + "content": "is then specified by the discriminator", + "type": "text" + }, + { + "bbox": [ + 280, + 361, + 391, + 373 + ], + "score": 0.92, + "content": "r _ { t } = - \\mathrm { l o g } \\bar { ( 1 - D ( \\mu _ { E } ( \\mathbf { s } ) ) ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 360, + 506, + 373 + ], + "score": 1.0, + "content": ". We refer to this method as", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 372, + 304, + 384 + ], + "spans": [ + { + "bbox": [ + 106, + 372, + 304, + 384 + ], + "score": 1.0, + "content": "variational adversarial imitation learning (VAIL).", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 14, + "bbox_fs": [ + 105, + 348, + 506, + 384 + ] + }, + { + "type": "title", + "bbox": [ + 105, + 398, + 460, + 410 + ], + "lines": [ + { + "bbox": [ + 105, + 397, + 461, + 410 + ], + "spans": [ + { + "bbox": [ + 105, + 397, + 461, + 410 + ], + "score": 1.0, + "content": "4.3 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING", + "type": "text" + } + ], + "index": 16 + } + ], + "index": 16 + }, + { + "type": "text", + "bbox": [ + 107, + 418, + 506, + 453 + ], + "lines": [ + { + "bbox": [ + 106, + 418, + 505, + 432 + ], + "spans": [ + { + "bbox": [ + 106, + 418, + 505, + 432 + ], + "score": 1.0, + "content": "The VDB can also be applied to adversarial inverse reinforcement learning (Fu et al., 2017) to yield a", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 430, + 505, + 443 + ], + "spans": [ + { + "bbox": [ + 106, + 430, + 505, + 443 + ], + "score": 1.0, + "content": "new algorithm which we call variational adversarial inverse reinforcement learning (VAIRL). AIRL", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 442, + 406, + 453 + ], + "spans": [ + { + "bbox": [ + 106, + 442, + 406, + 453 + ], + "score": 1.0, + "content": "operates in a similar manner to GAIL, but with a discriminator of the form", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 18, + "bbox_fs": [ + 106, + 418, + 505, + 453 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 220, + 459, + 389, + 486 + ], + "lines": [ + { + "bbox": [ + 220, + 459, + 389, + 486 + ], + "spans": [ + { + "bbox": [ + 220, + 459, + 389, + 486 + ], + "score": 0.95, + "content": "D ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) = \\frac { \\exp \\left( f ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) \\right) } { \\exp \\left( f ( { \\bf s } , { \\bf a } , { \\bf s } ^ { \\prime } ) \\right) + \\pi ( { \\bf a } | { \\bf s } ) } ,", + "type": "interline_equation", + "image_path": "7212ad8fa14e280e84e215b3c1ebb3635bdd15a3d80df61875e40e7c9f5fa2cb.jpg" + } + ] + } + ], + "index": 20.5, + "virtual_lines": [ + { + "bbox": [ + 220, + 459, + 389, + 472.5 + ], + "spans": [], + "index": 20 + }, + { + "bbox": [ + 220, + 472.5, + 389, + 486.0 + ], + "spans": [], + "index": 21 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 491, + 506, + 581 + ], + "lines": [ + { + "bbox": [ + 106, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 106, + 492, + 134, + 505 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 492, + 287, + 505 + ], + "score": 0.93, + "content": "f ( \\mathbf { s } , \\mathbf { a } , \\mathbf { s } ^ { \\prime } ) = g ( \\mathbf { s } , \\mathbf { a } ) + \\gamma h ( \\mathbf { s } ^ { \\prime } ) - h ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 492, + 312, + 505 + ], + "score": 1.0, + "content": ", with", + "type": "text" + }, + { + "bbox": [ + 312, + 495, + 319, + 504 + ], + "score": 0.81, + "content": "g", + "type": "inline_equation" + }, + { + "bbox": [ + 319, + 492, + 337, + 505 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 338, + 493, + 345, + 502 + ], + "score": 0.81, + "content": "h", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "being learned functions. Under certain", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 504, + 506, + 516 + ], + "spans": [ + { + "bbox": [ + 105, + 504, + 317, + 516 + ], + "score": 1.0, + "content": "restrictions on the environment, Fu et al. show that if", + "type": "text" + }, + { + "bbox": [ + 317, + 504, + 345, + 515 + ], + "score": 0.92, + "content": "g ( \\mathbf { s } , \\mathbf { a } )", + "type": "inline_equation" + }, + { + "bbox": [ + 346, + 504, + 506, + 516 + ], + "score": 1.0, + "content": "is defined to depend only on the current", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 514, + 505, + 527 + ], + "spans": [ + { + "bbox": [ + 105, + 514, + 186, + 527 + ], + "score": 1.0, + "content": "state s, the optimal", + "type": "text" + }, + { + "bbox": [ + 186, + 514, + 205, + 527 + ], + "score": 0.9, + "content": "g ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 514, + 377, + 527 + ], + "score": 1.0, + "content": "recovers the expert’s true reward function", + "type": "text" + }, + { + "bbox": [ + 378, + 514, + 400, + 527 + ], + "score": 0.93, + "content": "r ^ { * } ( \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 514, + 469, + 527 + ], + "score": 1.0, + "content": "up to a constant", + "type": "text" + }, + { + "bbox": [ + 469, + 514, + 505, + 527 + ], + "score": 0.91, + "content": "g ^ { * } ( \\mathbf { s } ) =", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 525, + 505, + 538 + ], + "spans": [ + { + "bbox": [ + 106, + 525, + 163, + 537 + ], + "score": 0.7, + "content": "r ^ { * } ( \\mathbf { s } ) + \\mathrm { c o n s i }", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 525, + 505, + 538 + ], + "score": 1.0, + "content": ". In this case, the learned reward can be re-used to train policies in environments with", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 536, + 506, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 506, + 549 + ], + "score": 1.0, + "content": "different dynamics, and will yield the same policy as if the policy was trained under the expert’s", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 547, + 505, + 559 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 491, + 559 + ], + "score": 1.0, + "content": "true reward. In contrast, GAIL’s discriminator typically cannot be re-optimized in this way", + "type": "text" + }, + { + "bbox": [ + 491, + 548, + 505, + 558 + ], + "score": 0.49, + "content": "\\mathrm { F u }", + "type": "inline_equation" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 557, + 505, + 572 + ], + "spans": [ + { + "bbox": [ + 105, + 557, + 337, + 572 + ], + "score": 1.0, + "content": "et al., 2017). In VAIRL, we introduce stochastic encoders", + "type": "text" + }, + { + "bbox": [ + 337, + 558, + 417, + 571 + ], + "score": 0.9, + "content": "E _ { g } ( \\mathbf { z } _ { g } | \\mathbf { s } ) , E _ { h } ( \\mathbf { z } _ { h } | \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 557, + 437, + 572 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + "bbox": [ + 438, + 558, + 489, + 570 + ], + "score": 0.93, + "content": "g ( \\mathbf { z } _ { g } ) , h ( \\mathbf { z } _ { h } )", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 557, + 505, + 572 + ], + "score": 1.0, + "content": "are", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 569, + 417, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 569, + 417, + 581 + ], + "score": 1.0, + "content": "modified to be functions of the encoding. We can reformulate Equation 13 as", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 25.5, + "bbox_fs": [ + 105, + 492, + 506, + 581 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 215, + 586, + 394, + 614 + ], + "lines": [ + { + "bbox": [ + 215, + 586, + 394, + 614 + ], + "spans": [ + { + "bbox": [ + 215, + 586, + 394, + 614 + ], + "score": 0.94, + "content": "D ( { \\bf s } , { \\bf a } , { \\bf z } ) = \\frac { \\exp \\left( f ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } ) \\right) } { \\exp \\left( f ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } ) \\right) + \\pi ( { \\bf a } | { \\bf s } ) } ,", + "type": "interline_equation", + "image_path": "c1dca0371bef123778f4f080d879166ca195632e96802ff6f086b8a42f2f8f6d.jpg" + } + ] + } + ], + "index": 30.5, + "virtual_lines": [ + { + "bbox": [ + 215, + 586, + 394, + 600.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 215, + 600.0, + 394, + 614.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 105, + 621, + 505, + 644 + ], + "lines": [ + { + "bbox": [ + 105, + 619, + 506, + 635 + ], + "spans": [ + { + "bbox": [ + 105, + 619, + 120, + 635 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 121, + 621, + 187, + 633 + ], + "score": 0.92, + "content": "{ \\bf z } = ( { \\bf z } _ { g } , { \\bf z } _ { h } , { \\bf z } _ { h } ^ { \\prime } )", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 619, + 204, + 635 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 205, + 621, + 394, + 634 + ], + "score": 0.92, + "content": "f ( \\mathbf { z } _ { g } , \\mathbf { z } _ { h } , \\mathbf { z } _ { h } ^ { \\prime } ) = D _ { g } ( \\mathbf { z } _ { g } ) + \\gamma D _ { h } ( \\mathbf { z } _ { h } ^ { \\prime } ) - D _ { h } ( \\mathbf { z } _ { h } )", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 619, + 506, + 635 + ], + "score": 1.0, + "content": ". 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Performance is", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 202, + 506, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 202, + 506, + 213 + ], + "score": 1.0, + "content": "measured using the average joint rotation error between the simulated character and the reference", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 213, + 331, + 223 + ], + "spans": [ + { + "bbox": [ + 106, + 213, + 331, + 223 + ], + "score": 1.0, + "content": "motion. Each method is evaluated with 3 random seeds.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4 + } + ], + "index": 2.5 + }, + { + "type": "table", + "bbox": [ + 111, + 227, + 500, + 336 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 111, + 227, + 500, + 336 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 111, + 227, + 500, + 336 + ], + "spans": [ + { + "bbox": [ + 111, + 227, + 500, + 336 + ], + "score": 0.98, + "html": "
MethodBackflipCartwheelDanceRunSpinkick
BC3.012.882.932.632.88
Merel et al., 20171.33 ± 0.031.47 ± 0.122.61 ± 0.300.52 ± 0.041.82 ± 0.35
GAIL0.74±0.150.84± 0.051.31 ± 0.160.17±0.031.07 ± 0.03
GAIL -noise0.42±0.020.92±0.070.96±0.080.21±0.050.95±0.14
GAIL - noise z0.67±0.120.72± 0.041.14 ± 0.080.14±0.030.64±0.09
GAIL - GP0.62±0.090.69 ±0.050.80± 0.320.12 ± 0.020.64± 0.04
VAIL (ours)0.36±0.130.40±0.080.40±0.210.13±0.010.34± 0.05
VAIL - GP (ours)0.46±0.170.31 ± 0.020.15±0.010.10±0.010.31 ± 0.02
Peng et al., 20180.260.210.200.140.19
", + "type": "table", + "image_path": "346089c245b30bd37a6cd509146d18600d174fb1785c12f06f4b747a34482c63.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 111, + 227, + 500, + 263.3333333333333 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 111, + 263.3333333333333, + 500, + 299.66666666666663 + ], + "spans": [], + "index": 7 + }, + { + "bbox": [ + 111, + 299.66666666666663, + 500, + 335.99999999999994 + ], + "spans": [], + "index": 8 + } + ] + }, + { + "type": "table_footnote", + "bbox": [ + 108, + 338, + 502, + 372 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 337, + 504, + 351 + ], + "spans": [ + { + "bbox": [ + 105, + 337, + 504, + 351 + ], + "score": 1.0, + "content": "Table 1: Average joint rotation error (radians) on humanoid motion imitation tasks. VAIL outper-", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 348, + 504, + 361 + ], + "spans": [ + { + "bbox": [ + 105, + 348, + 504, + 361 + ], + "score": 1.0, + "content": "forms the other methods for all skills evaluated, except for policies trained using the manually-", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 360, + 309, + 372 + ], + "spans": [ + { + "bbox": [ + 106, + 360, + 309, + 372 + ], + "score": 1.0, + "content": "designed reward function from (Peng et al., 2018).", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10 + } + ], + "index": 8.5 + }, + { + "type": "title", + "bbox": [ + 107, + 379, + 200, + 391 + ], + "lines": [ + { + "bbox": [ + 105, + 377, + 201, + 393 + ], + "spans": [ + { + "bbox": [ + 105, + 377, + 201, + 393 + ], + "score": 1.0, + "content": "5 EXPERIMENTS", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 107, + 404, + 505, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "score": 1.0, + "content": "We evaluate our method on adversarial learning problems in imitation learning, inverse reinforce-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 416, + 505, + 427 + ], + "spans": [ + { + "bbox": [ + 105, + 416, + 505, + 427 + ], + "score": 1.0, + "content": "ment learning, and image generation. In the case of imitation learning, we show that the VDB", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 426, + 505, + 439 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 505, + 439 + ], + "score": 1.0, + "content": "enables agents to learn complex motion skills from a single demonstration, including visual demon-", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 437, + 505, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 437, + 505, + 450 + ], + "score": 1.0, + "content": "strations provided in the form of video clips. We also show that the VDB improves the performance", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 448, + 505, + 461 + ], + "spans": [ + { + "bbox": [ + 105, + 448, + 505, + 461 + ], + "score": 1.0, + "content": "of inverse RL methods. Inverse RL aims to reconstruct a reward function from a set demonstrations,", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 458, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 458, + 506, + 473 + ], + "score": 1.0, + "content": "which can then used to perform the task in new environments, in contrast to imitation learning,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "spans": [ + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "score": 1.0, + "content": "which aims to recover a policy directly. Our method is also not limited to control tasks, and we", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 480, + 368, + 493 + ], + "spans": [ + { + "bbox": [ + 105, + 480, + 368, + 493 + ], + "score": 1.0, + "content": "demonstrate its effectiveness for unconditional image generation.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 16.5 + }, + { + "type": "title", + "bbox": [ + 106, + 507, + 383, + 519 + ], + "lines": [ + { + "bbox": [ + 105, + 506, + 384, + 520 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 384, + 520 + ], + "score": 1.0, + "content": "5.1 VAIL: VARIATIONAL ADVERSARIAL IMITATION LEARNING", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 107, + 528, + 505, + 627 + ], + "lines": [ + { + "bbox": [ + 106, + 528, + 505, + 541 + ], + "spans": [ + { + "bbox": [ + 106, + 528, + 505, + 541 + ], + "score": 1.0, + "content": "The goal of the motion imitation tasks is to train a simulated character to mimic demonstrations pro-", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 539, + 505, + 552 + ], + "spans": [ + { + "bbox": [ + 106, + 539, + 505, + 552 + ], + "score": 1.0, + "content": "vided by mocap clips recorded from human actors. Each mocap clip provides a sequence of target", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 549, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 549, + 131, + 563 + ], + "score": 1.0, + "content": "states", + "type": "text" + }, + { + "bbox": [ + 132, + 550, + 192, + 562 + ], + "score": 0.93, + "content": "\\big \\{ \\mathbf { s } _ { 0 } ^ { * } , \\mathbf { s } _ { 1 } ^ { * } , . . . , \\mathbf { s } _ { T } ^ { * } \\big \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 549, + 506, + 563 + ], + "score": 1.0, + "content": "that the character should track at each timestep. We use a similar experimental", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "score": 1.0, + "content": "setup as Peng et al. (2018), with a 34 degrees-of-freedom humanoid character. We found that the", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 572, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 506, + 585 + ], + "score": 1.0, + "content": "discriminator architecture can greatly affect the performance on complex skills. The particular ar-", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 582, + 506, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 506, + 595 + ], + "score": 1.0, + "content": "chitecture we employ differs substantially from those used in prior work (Merel et al., 2017), details", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 594, + 506, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 594, + 325, + 606 + ], + "score": 1.0, + "content": "of which are available in Appendix C. The encoding", + "type": "text" + }, + { + "bbox": [ + 325, + 594, + 334, + 604 + ], + "score": 0.82, + "content": "Z", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 594, + 506, + 606 + ], + "score": 1.0, + "content": "is 128D and an information constraint of", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 107, + 603, + 506, + 619 + ], + "spans": [ + { + "bbox": [ + 107, + 605, + 144, + 616 + ], + "score": 0.91, + "content": "I _ { c } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 603, + 333, + 619 + ], + "score": 1.0, + "content": "is applied for all skills, with a dual stepsize of", + "type": "text" + }, + { + "bbox": [ + 333, + 604, + 380, + 618 + ], + "score": 0.92, + "content": "\\alpha _ { \\beta } = 1 0 ^ { - 5 }", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 603, + 506, + 619 + ], + "score": 1.0, + "content": ". All policies are trained using", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 616, + 225, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 616, + 225, + 628 + ], + "score": 1.0, + "content": "PPO (Schulman et al., 2017).", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 26 + }, + { + "type": "text", + "bbox": [ + 106, + 632, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 633, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 106, + 633, + 506, + 646 + ], + "score": 1.0, + "content": "The motions learned by the policies are best seen in the supplementary video. Snapshots of the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 644, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 505, + 656 + ], + "score": 1.0, + "content": "character’s motions are shown in Figure 3. Each skill is learned from a single demonstration. VAIL", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "is able to closely reproduce a variety of skills, including those that involve highly dynamics flips and", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 666, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 106, + 666, + 505, + 678 + ], + "score": 1.0, + "content": "complex contacts. We compare VAIL to a number of other techniques, including state-only GAIL", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 677, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 505, + 690 + ], + "score": 1.0, + "content": "(Ho & Ermon, 2016), GAIL with instance noise applied to the discriminator inputs (GAIL - noise),", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "GAIL with instance noise applied to the last hidden layer (GAIL - noise z), and GAIL with a gradient", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 699, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 506, + 712 + ], + "score": 1.0, + "content": "penalty applied to the discriminator (GAIL - GP) (Mescheder et al., 2018). Since the VDB helps to", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "score": 1.0, + "content": "prevent vanishing gradients, while GP mitigates exploding gradients, the two techniques can be seen", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "as being complementary. Therefore, we also train a model that combines both VAIL and GP (VAIL -", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 35 + } + ], + "page_idx": 6, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 303, + 751, + 309, + 759 + ], + "lines": [ + { + "bbox": [ + 302, + 750, + 309, + 762 + ], + "spans": [ + { + "bbox": [ + 302, + 750, + 309, + 762 + ], + "score": 1.0, + "content": "7", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "image", + "bbox": [ + 110, + 83, + 502, + 186 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 83, + 502, + 186 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 83, + 502, + 186 + ], + "spans": [ + { + "bbox": [ + 110, + 83, + 502, + 186 + ], + "score": 0.964, + "type": "image", + "image_path": "f8345f9a0288395a6d57696ed487a1c948855dd61361b99c00b0067aa21d534b.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 110, + 83, + 502, + 117.33333333333334 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 110, + 117.33333333333334, + 502, + 151.66666666666669 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 110, + 151.66666666666669, + 502, + 186.00000000000003 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 108, + 190, + 504, + 223 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 190, + 506, + 203 + ], + "spans": [ + { + "bbox": [ + 106, + 190, + 506, + 203 + ], + "score": 1.0, + "content": "Figure 4: Learning curves comparing VAIL to other methods for motion imitation. Performance is", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 202, + 506, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 202, + 506, + 213 + ], + "score": 1.0, + "content": "measured using the average joint rotation error between the simulated character and the reference", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 213, + 331, + 223 + ], + "spans": [ + { + "bbox": [ + 106, + 213, + 331, + 223 + ], + "score": 1.0, + "content": "motion. Each method is evaluated with 3 random seeds.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4 + } + ], + "index": 2.5 + }, + { + "type": "table", + "bbox": [ + 111, + 227, + 500, + 336 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 111, + 227, + 500, + 336 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 111, + 227, + 500, + 336 + ], + "spans": [ + { + "bbox": [ + 111, + 227, + 500, + 336 + ], + "score": 0.98, + "html": "
MethodBackflipCartwheelDanceRunSpinkick
BC3.012.882.932.632.88
Merel et al., 20171.33 ± 0.031.47 ± 0.122.61 ± 0.300.52 ± 0.041.82 ± 0.35
GAIL0.74±0.150.84± 0.051.31 ± 0.160.17±0.031.07 ± 0.03
GAIL -noise0.42±0.020.92±0.070.96±0.080.21±0.050.95±0.14
GAIL - noise z0.67±0.120.72± 0.041.14 ± 0.080.14±0.030.64±0.09
GAIL - GP0.62±0.090.69 ±0.050.80± 0.320.12 ± 0.020.64± 0.04
VAIL (ours)0.36±0.130.40±0.080.40±0.210.13±0.010.34± 0.05
VAIL - GP (ours)0.46±0.170.31 ± 0.020.15±0.010.10±0.010.31 ± 0.02
Peng et al., 20180.260.210.200.140.19
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VAIL outper-", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 348, + 504, + 361 + ], + "spans": [ + { + "bbox": [ + 105, + 348, + 504, + 361 + ], + "score": 1.0, + "content": "forms the other methods for all skills evaluated, except for policies trained using the manually-", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 360, + 309, + 372 + ], + "spans": [ + { + "bbox": [ + 106, + 360, + 309, + 372 + ], + "score": 1.0, + "content": "designed reward function from (Peng et al., 2018).", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10 + } + ], + "index": 8.5 + }, + { + "type": "title", + "bbox": [ + 107, + 379, + 200, + 391 + ], + "lines": [ + { + "bbox": [ + 105, + 377, + 201, + 393 + ], + "spans": [ + { + "bbox": [ + 105, + 377, + 201, + 393 + ], + "score": 1.0, + "content": "5 EXPERIMENTS", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 107, + 404, + 505, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "score": 1.0, + "content": "We evaluate our method on adversarial learning problems in imitation learning, inverse reinforce-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 416, + 505, + 427 + ], + "spans": [ + { + "bbox": [ + 105, + 416, + 505, + 427 + ], + "score": 1.0, + "content": "ment learning, and image generation. In the case of imitation learning, we show that the VDB", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 426, + 505, + 439 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 505, + 439 + ], + "score": 1.0, + "content": "enables agents to learn complex motion skills from a single demonstration, including visual demon-", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 437, + 505, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 437, + 505, + 450 + ], + "score": 1.0, + "content": "strations provided in the form of video clips. We also show that the VDB improves the performance", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 448, + 505, + 461 + ], + "spans": [ + { + "bbox": [ + 105, + 448, + 505, + 461 + ], + "score": 1.0, + "content": "of inverse RL methods. Inverse RL aims to reconstruct a reward function from a set demonstrations,", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 458, + 506, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 458, + 506, + 473 + ], + "score": 1.0, + "content": "which can then used to perform the task in new environments, in contrast to imitation learning,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "spans": [ + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "score": 1.0, + "content": "which aims to recover a policy directly. 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We found that the", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 572, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 506, + 585 + ], + "score": 1.0, + "content": "discriminator architecture can greatly affect the performance on complex skills. The particular ar-", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 582, + 506, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 506, + 595 + ], + "score": 1.0, + "content": "chitecture we employ differs substantially from those used in prior work (Merel et al., 2017), details", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 594, + 506, + 606 + ], + "spans": [ + { + "bbox": [ + 106, + 594, + 325, + 606 + ], + "score": 1.0, + "content": "of which are available in Appendix C. 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All policies are trained using", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 616, + 225, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 616, + 225, + 628 + ], + "score": 1.0, + "content": "PPO (Schulman et al., 2017).", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 26, + "bbox_fs": [ + 105, + 528, + 506, + 628 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 632, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 633, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 106, + 633, + 506, + 646 + ], + "score": 1.0, + "content": "The motions learned by the policies are best seen in the supplementary video. Snapshots of the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 644, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 505, + 656 + ], + "score": 1.0, + "content": "character’s motions are shown in Figure 3. Each skill is learned from a single demonstration. VAIL", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "is able to closely reproduce a variety of skills, including those that involve highly dynamics flips and", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 666, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 106, + 666, + 505, + 678 + ], + "score": 1.0, + "content": "complex contacts. We compare VAIL to a number of other techniques, including state-only GAIL", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 677, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 505, + 690 + ], + "score": 1.0, + "content": "(Ho & Ermon, 2016), GAIL with instance noise applied to the discriminator inputs (GAIL - noise),", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "GAIL with instance noise applied to the last hidden layer (GAIL - noise z), and GAIL with a gradient", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 699, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 506, + 712 + ], + "score": 1.0, + "content": "penalty applied to the discriminator (GAIL - GP) (Mescheder et al., 2018). Since the VDB helps to", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "score": 1.0, + "content": "prevent vanishing gradients, while GP mitigates exploding gradients, the two techniques can be seen", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "as being complementary. Therefore, we also train a model that combines both VAIL and GP (VAIL -", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 35, + "bbox_fs": [ + 105, + 633, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 114, + 78, + 493, + 191 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 114, + 78, + 493, + 191 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 114, + 78, + 493, + 191 + ], + "spans": [ + { + "bbox": [ + 114, + 78, + 493, + 191 + ], + "score": 0.964, + "type": "image", + "image_path": "7497cb73e50bbfbd813c2ffce4161f7254aec761aabb16358d90c1638d8e73f8.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 114, + 78, + 493, + 115.66666666666666 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 114, + 115.66666666666666, + 493, + 153.33333333333331 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 114, + 153.33333333333331, + 493, + 190.99999999999997 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 196, + 505, + 241 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 196, + 505, + 208 + ], + "spans": [ + { + "bbox": [ + 106, + 196, + 505, + 208 + ], + "score": 1.0, + "content": "Figure 5: Left: Snapshots of the video demonstration and the simulated character trained with", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 207, + 506, + 221 + ], + "spans": [ + { + "bbox": [ + 105, + 207, + 506, + 221 + ], + "score": 1.0, + "content": "VAIL. The policy learns to run by directly imitating the video. Right: Saliency maps that visualize", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 217, + 505, + 232 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 505, + 232 + ], + "score": 1.0, + "content": "the magnitude of the discriminator’s gradient with respect to all channels of the RGB input images", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 229, + 474, + 242 + ], + "spans": [ + { + "bbox": [ + 105, + 229, + 474, + 242 + ], + "score": 1.0, + "content": "from both the demonstration and the simulation. 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Only VAIL successfully learns to run from a video", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 365, + 505, + 379 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 357, + 379 + ], + "score": 1.0, + "content": "demonstration. Middle: Effect of training with fixed values of", + "type": "text" + }, + { + "bbox": [ + 357, + 367, + 365, + 378 + ], + "score": 0.85, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 365, + 417, + 379 + ], + "score": 1.0, + "content": "and adaptive", + "type": "text" + }, + { + "bbox": [ + 418, + 367, + 425, + 378 + ], + "score": 0.78, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 365, + 429, + 379 + ], + "score": 0.0, + "content": "", + "type": "text" + }, + { + "bbox": [ + 429, + 367, + 466, + 378 + ], + "score": 0.86, + "content": "I _ { c } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 365, + 505, + 379 + ], + "score": 1.0, + "content": "). Right:.", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 378, + 505, + 389 + ], + "spans": [ + { + "bbox": [ + 106, + 378, + 307, + 389 + ], + "score": 1.0, + "content": "KL loss over the course of training with adaptive", + "type": "text" + }, + { + "bbox": [ + 307, + 378, + 315, + 389 + ], + "score": 0.82, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 378, + 470, + 389 + ], + "score": 1.0, + "content": ". The dual gradient descent update for", + "type": "text" + }, + { + "bbox": [ + 470, + 378, + 478, + 389 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 478, + 378, + 505, + 389 + ], + "score": 1.0, + "content": "effec-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 388, + 261, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 388, + 247, + 402 + ], + "score": 1.0, + "content": "tively enforces the VDB constraint", + "type": "text" + }, + { + "bbox": [ + 248, + 389, + 257, + 399 + ], + "score": 0.87, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 388, + 261, + 402 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 12 + } + ], + "index": 10.0 + }, + { + "type": "text", + "bbox": [ + 107, + 412, + 505, + 555 + ], + "lines": [ + { + "bbox": [ + 105, + 411, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 506, + 426 + ], + "score": 1.0, + "content": "GP). Implementation details for combining the VDB and GP are available in Appendix B. Learning", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 424, + 506, + 436 + ], + "spans": [ + { + "bbox": [ + 106, + 424, + 506, + 436 + ], + "score": 1.0, + "content": "curves for the various methods are shown in Figure 10 and Table 1 summarizes the performance of", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 435, + 506, + 447 + ], + "spans": [ + { + "bbox": [ + 106, + 435, + 506, + 447 + ], + "score": 1.0, + "content": "the final policies. Performance is measured in terms of the average joint rotation error between the", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 445, + 506, + 458 + ], + "spans": [ + { + "bbox": [ + 106, + 445, + 506, + 458 + ], + "score": 1.0, + "content": "simulated character and the reference motion. We also include a reimplementation of the method", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 456, + 506, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 506, + 469 + ], + "score": 1.0, + "content": "described by Merel et al. (2017). For the purpose of our experiments, GAIL denotes policies trained", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 467, + 505, + 480 + ], + "spans": [ + { + "bbox": [ + 106, + 467, + 505, + 480 + ], + "score": 1.0, + "content": "using our particular architecture but without a VDB, and Merel et al. (2017) denotes policies trained", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 479, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 106, + 479, + 505, + 491 + ], + "score": 1.0, + "content": "using an architecture that closely mirror those from previous work. Furthermore, we include com-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 489, + 505, + 502 + ], + "spans": [ + { + "bbox": [ + 105, + 489, + 505, + 502 + ], + "score": 1.0, + "content": "parisons to policies trained using the handcrafted reward from Peng et al. (2018), as well as policies", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 501, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 106, + 501, + 505, + 513 + ], + "score": 1.0, + "content": "trained via behavioral cloning (BC). Since mocap data does not provide expert actions, we use the", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "score": 1.0, + "content": "policies from Peng et al. (2018) as oracles to provide state-action demonstrations, which are then", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 523, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 523, + 452, + 535 + ], + "score": 1.0, + "content": "used to train the BC policies via supervised learning. Each BC policy is trained with", + "type": "text" + }, + { + "bbox": [ + 453, + 523, + 469, + 533 + ], + "score": 0.31, + "content": "1 0 \\mathrm { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 523, + 505, + 535 + ], + "score": 1.0, + "content": "samples", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "score": 1.0, + "content": "from the oracle policies, while all other policies are trained from just a single demonstration, the", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 545, + 274, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 545, + 274, + 556 + ], + "score": 1.0, + "content": "equivalent of approximately 100 samples.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 107, + 561, + 505, + 682 + ], + "lines": [ + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "score": 1.0, + "content": "VAIL consistently outperforms previous adversarial methods, and VAIL - GP achieves the best per-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 571, + 506, + 586 + ], + "spans": [ + { + "bbox": [ + 105, + 571, + 506, + 586 + ], + "score": 1.0, + "content": "formance overall. Simply adding instance noise to the inputs (Salimans et al., 2016) or hidden layer", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 583, + 505, + 595 + ], + "spans": [ + { + "bbox": [ + 106, + 583, + 505, + 595 + ], + "score": 1.0, + "content": "without the KL constraint (Sønderby et al., 2016) leads to worse performance, since the network can", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 593, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 593, + 505, + 607 + ], + "score": 1.0, + "content": "learn a latent representation that renders the effects of the noise negligible. Though training with", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 604, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 505, + 618 + ], + "score": 1.0, + "content": "the handcrafted reward still outperforms the adversarial methods, VAIL demonstrates comparable", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 616, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 105, + 616, + 505, + 629 + ], + "score": 1.0, + "content": "performance to the handcrafted reward without manual reward or feature engineering, and produces", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 627, + 505, + 640 + ], + "spans": [ + { + "bbox": [ + 105, + 627, + 505, + 640 + ], + "score": 1.0, + "content": "motions that closely resemble the original demonstrations. The method from Merel et al. (2017) was", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "score": 1.0, + "content": "able to imitate simple skills such as running, but was unable to reproduce more acrobatic skills such", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 649, + 505, + 661 + ], + "spans": [ + { + "bbox": [ + 105, + 649, + 505, + 661 + ], + "score": 1.0, + "content": "as the backflip and spinkick. In the case of running, our implementation produces more natural gaits", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 660, + 505, + 672 + ], + "spans": [ + { + "bbox": [ + 105, + 660, + 505, + 672 + ], + "score": 1.0, + "content": "than the results reported in Merel et al. (2017). Behavioral cloning is unable to reproduce any of the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 671, + 496, + 683 + ], + "spans": [ + { + "bbox": [ + 105, + 671, + 496, + 683 + ], + "score": 1.0, + "content": "skills, despite being provided with substantially more demonstration data than the other methods.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "Video Imitation: While our method achieves substantially better results on motion imitation when", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "compared to prior work, previous methods can still produce reasonable behaviors. However, if the", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "demonstrations are provided in terms of the raw pixels from video clips, instead of mocap data,", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 721, + 505, + 732 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 505, + 732 + ], + "score": 1.0, + "content": "the imitation task becomes substantially harder. The goal of the agent is therefore to directly im-", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 40.5 + } + ], + "page_idx": 7, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 293, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 293, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 752, + 308, + 759 + ], + "lines": [ + { + "bbox": [ + 302, + 750, + 309, + 761 + ], + "spans": [ + { + "bbox": [ + 302, + 750, + 309, + 761 + ], + "score": 1.0, + "content": "8", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "image", + "bbox": [ + 114, + 78, + 493, + 191 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 114, + 78, + 493, + 191 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 114, + 78, + 493, + 191 + ], + "spans": [ + { + "bbox": [ + 114, + 78, + 493, + 191 + ], + "score": 0.964, + "type": "image", + "image_path": "7497cb73e50bbfbd813c2ffce4161f7254aec761aabb16358d90c1638d8e73f8.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 114, + 78, + 493, + 115.66666666666666 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 114, + 115.66666666666666, + 493, + 153.33333333333331 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 114, + 153.33333333333331, + 493, + 190.99999999999997 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 196, + 505, + 241 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 196, + 505, + 208 + ], + "spans": [ + { + "bbox": [ + 106, + 196, + 505, + 208 + ], + "score": 1.0, + "content": "Figure 5: Left: Snapshots of the video demonstration and the simulated character trained with", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 207, + 506, + 221 + ], + "spans": [ + { + "bbox": [ + 105, + 207, + 506, + 221 + ], + "score": 1.0, + "content": "VAIL. 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Only VAIL successfully learns to run from a video", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 365, + 505, + 379 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 357, + 379 + ], + "score": 1.0, + "content": "demonstration. Middle: Effect of training with fixed values of", + "type": "text" + }, + { + "bbox": [ + 357, + 367, + 365, + 378 + ], + "score": 0.85, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 365, + 417, + 379 + ], + "score": 1.0, + "content": "and adaptive", + "type": "text" + }, + { + "bbox": [ + 418, + 367, + 425, + 378 + ], + "score": 0.78, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 426, + 365, + 429, + 379 + ], + "score": 0.0, + "content": "", + "type": "text" + }, + { + "bbox": [ + 429, + 367, + 466, + 378 + ], + "score": 0.86, + "content": "I _ { c } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 365, + 505, + 379 + ], + "score": 1.0, + "content": "). Right:.", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 378, + 505, + 389 + ], + "spans": [ + { + "bbox": [ + 106, + 378, + 307, + 389 + ], + "score": 1.0, + "content": "KL loss over the course of training with adaptive", + "type": "text" + }, + { + "bbox": [ + 307, + 378, + 315, + 389 + ], + "score": 0.82, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 378, + 470, + 389 + ], + "score": 1.0, + "content": ". The dual gradient descent update for", + "type": "text" + }, + { + "bbox": [ + 470, + 378, + 478, + 389 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 478, + 378, + 505, + 389 + ], + "score": 1.0, + "content": "effec-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 388, + 261, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 388, + 247, + 402 + ], + "score": 1.0, + "content": "tively enforces the VDB constraint", + "type": "text" + }, + { + "bbox": [ + 248, + 389, + 257, + 399 + ], + "score": 0.87, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 388, + 261, + 402 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 12 + } + ], + "index": 10.0 + }, + { + "type": "text", + "bbox": [ + 107, + 412, + 505, + 555 + ], + "lines": [ + { + "bbox": [ + 105, + 411, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 506, + 426 + ], + "score": 1.0, + "content": "GP). Implementation details for combining the VDB and GP are available in Appendix B. Learning", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 424, + 506, + 436 + ], + "spans": [ + { + "bbox": [ + 106, + 424, + 506, + 436 + ], + "score": 1.0, + "content": "curves for the various methods are shown in Figure 10 and Table 1 summarizes the performance of", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 435, + 506, + 447 + ], + "spans": [ + { + "bbox": [ + 106, + 435, + 506, + 447 + ], + "score": 1.0, + "content": "the final policies. Performance is measured in terms of the average joint rotation error between the", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 445, + 506, + 458 + ], + "spans": [ + { + "bbox": [ + 106, + 445, + 506, + 458 + ], + "score": 1.0, + "content": "simulated character and the reference motion. We also include a reimplementation of the method", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 456, + 506, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 506, + 469 + ], + "score": 1.0, + "content": "described by Merel et al. (2017). For the purpose of our experiments, GAIL denotes policies trained", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 467, + 505, + 480 + ], + "spans": [ + { + "bbox": [ + 106, + 467, + 505, + 480 + ], + "score": 1.0, + "content": "using our particular architecture but without a VDB, and Merel et al. (2017) denotes policies trained", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 479, + 505, + 491 + ], + "spans": [ + { + "bbox": [ + 106, + 479, + 505, + 491 + ], + "score": 1.0, + "content": "using an architecture that closely mirror those from previous work. Furthermore, we include com-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 489, + 505, + 502 + ], + "spans": [ + { + "bbox": [ + 105, + 489, + 505, + 502 + ], + "score": 1.0, + "content": "parisons to policies trained using the handcrafted reward from Peng et al. (2018), as well as policies", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 501, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 106, + 501, + 505, + 513 + ], + "score": 1.0, + "content": "trained via behavioral cloning (BC). Since mocap data does not provide expert actions, we use the", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "score": 1.0, + "content": "policies from Peng et al. (2018) as oracles to provide state-action demonstrations, which are then", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 523, + 505, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 523, + 452, + 535 + ], + "score": 1.0, + "content": "used to train the BC policies via supervised learning. Each BC policy is trained with", + "type": "text" + }, + { + "bbox": [ + 453, + 523, + 469, + 533 + ], + "score": 0.31, + "content": "1 0 \\mathrm { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 470, + 523, + 505, + 535 + ], + "score": 1.0, + "content": "samples", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "score": 1.0, + "content": "from the oracle policies, while all other policies are trained from just a single demonstration, the", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 545, + 274, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 545, + 274, + 556 + ], + "score": 1.0, + "content": "equivalent of approximately 100 samples.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 411, + 506, + 556 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 561, + 505, + 682 + ], + "lines": [ + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "score": 1.0, + "content": "VAIL consistently outperforms previous adversarial methods, and VAIL - GP achieves the best per-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 571, + 506, + 586 + ], + "spans": [ + { + "bbox": [ + 105, + 571, + 506, + 586 + ], + "score": 1.0, + "content": "formance overall. 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When trained on the training maze on the left, AIRL learns", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 205, + 505, + 219 + ], + "spans": [ + { + "bbox": [ + 104, + 205, + 505, + 219 + ], + "score": 1.0, + "content": "a reward that overfits to the training task, and which cannot be transferred to the mirrored maze on", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 216, + 505, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 505, + 230 + ], + "score": 1.0, + "content": "the right. In contrast, VAIRL learns a smoother reward function that enables more-reliable transfer.", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 228, + 505, + 241 + ], + "spans": [ + { + "bbox": [ + 106, + 228, + 495, + 241 + ], + "score": 1.0, + "content": "Right: Performance on flipped test versions of our two training mazes. We report mean return (", + "type": "text" + }, + { + "bbox": [ + 495, + 229, + 505, + 239 + ], + "score": 0.63, + "content": "\\pm", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 239, + 475, + 253 + ], + "spans": [ + { + "bbox": [ + 106, + 239, + 475, + 253 + ], + "score": 1.0, + "content": "std. dev.) over five runs, and the mean return for the expert used to generate demonstrations.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18 + } + ], + "index": 10.75 + }, + { + "type": "table", + "bbox": [ + 299, + 83, + 486, + 191 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 299, + 83, + 486, + 191 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 299, + 83, + 486, + 191 + ], + "spans": [ + { + "bbox": [ + 299, + 83, + 486, + 191 + ], + "score": 0.638, + "html": "
MethodTransferenvironments
C-mazeS-maze
GAIL-24.6±7.21.0±1.3
VAIL-65.6±18.920.8±39.7
AIRL-15.3±7.8-0.2±0.1
AIRL - GP-9.14±0.4-0.14±0.3
VAIRL (β = 0)-25.5±7.262.3±33.2
VAIRL (ours)-10.0±2.274.0±38.7
VAIRL - GP (ours)-9.18±0.4156.5±5.6
TRPO expert-5.1153.2
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Figure 6 compares learning curves of policies trained with VAIL, GAIL, and", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 294, + 505, + 307 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 505, + 307 + ], + "score": 1.0, + "content": "policies trained using a reward function defined by the average pixel-wise difference between the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 304, + 506, + 318 + ], + "spans": [ + { + "bbox": [ + 105, + 304, + 132, + 318 + ], + "score": 1.0, + "content": "frame", + "type": "text" + }, + { + "bbox": [ + 133, + 306, + 149, + 317 + ], + "score": 0.85, + "content": "M _ { t } ^ { * }", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 304, + 362, + 318 + ], + "score": 1.0, + "content": "from the video demonstration and a rendered image", + "type": "text" + }, + { + "bbox": [ + 362, + 306, + 376, + 317 + ], + "score": 0.88, + "content": "M _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 377, + 304, + 496, + 318 + ], + "score": 1.0, + "content": "of the agent at each timestep", + "type": "text" + }, + { + "bbox": [ + 496, + 307, + 501, + 316 + ], + "score": 0.55, + "content": "t", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 304, + 506, + 318 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 314, + 445, + 331 + ], + "spans": [ + { + "bbox": [ + 106, + 316, + 227, + 330 + ], + "score": 0.91, + "content": "\\begin{array} { r } { r _ { t } = 1 - \\frac { 1 } { 3 \\times 6 4 ^ { 2 } } | | M _ { t } ^ { * } - M _ { t } | | ^ { 2 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 314, + 356, + 331 + ], + "score": 1.0, + "content": ". Each frame is represented by a", + "type": "text" + }, + { + "bbox": [ + 356, + 317, + 390, + 327 + ], + "score": 0.83, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 390, + 314, + 445, + 331 + ], + "score": 1.0, + "content": "RGB image.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23.5 + }, + { + "type": "text", + "bbox": [ + 107, + 334, + 505, + 434 + ], + "lines": [ + { + "bbox": [ + 106, + 335, + 505, + 347 + ], + "spans": [ + { + "bbox": [ + 106, + 335, + 505, + 347 + ], + "score": 1.0, + "content": "Both GAIL and the pixel-loss are unable to learn the running gait. VAIL is the only method that", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 345, + 505, + 357 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 505, + 357 + ], + "score": 1.0, + "content": "successfully learns to imitate the skill from the video demonstration. 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Saliency maps for discriminators trained with VAIL and GAIL are available", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "score": 1.0, + "content": "in Figure 5. The VAIL discriminator learns to attend to spatially coherent image patches around the", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 399, + 505, + 414 + ], + "spans": [ + { + "bbox": [ + 105, + 399, + 505, + 414 + ], + "score": 1.0, + "content": "character, while the GAIL discriminator exhibits less structure. The magnitude of the gradients from", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 411, + 505, + 424 + ], + "spans": [ + { + "bbox": [ + 106, + 411, + 505, + 424 + ], + "score": 1.0, + "content": "VAIL also tend to be significantly larger than those from GAIL, which may suggests that VAIL is", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 422, + 383, + 435 + ], + "spans": [ + { + "bbox": [ + 105, + 422, + 383, + 435 + ], + "score": 1.0, + "content": "able to mitigate the problem of vanishing gradients present in GAIL.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 31 + }, + { + "type": "text", + "bbox": [ + 107, + 439, + 505, + 516 + ], + "lines": [ + { + "bbox": [ + 105, + 438, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 348, + 452 + ], + "score": 1.0, + "content": "Adaptive Constraint: To evaluate the effects of the adaptive", + "type": "text" + }, + { + "bbox": [ + 349, + 440, + 356, + 451 + ], + "score": 0.85, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 438, + 506, + 452 + ], + "score": 1.0, + "content": "updates, we compare policies trained", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 450, + 505, + 463 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 230, + 463 + ], + "score": 1.0, + "content": "with different fixed values of", + "type": "text" + }, + { + "bbox": [ + 230, + 451, + 238, + 461 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 450, + 320, + 463 + ], + "score": 1.0, + "content": "and policies where", + "type": "text" + }, + { + "bbox": [ + 320, + 451, + 328, + 462 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 450, + 505, + 463 + ], + "score": 1.0, + "content": "is updated adaptively to enforce a desired", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 461, + 505, + 474 + ], + "spans": [ + { + "bbox": [ + 105, + 461, + 199, + 474 + ], + "score": 1.0, + "content": "information constraint", + "type": "text" + }, + { + "bbox": [ + 199, + 461, + 237, + 472 + ], + "score": 0.9, + "content": "I _ { c } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 461, + 505, + 474 + ], + "score": 1.0, + "content": ". Figure 6 illustrates the learning curves and the KL loss over the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 471, + 506, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 207, + 485 + ], + "score": 1.0, + "content": "course of training. When", + "type": "text" + }, + { + "bbox": [ + 208, + 473, + 215, + 483 + ], + "score": 0.85, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 471, + 506, + 485 + ], + "score": 1.0, + "content": "is too small, performance reverts to that achieved by GAIL. Large values", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 482, + 506, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 117, + 497 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 484, + 125, + 495 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 125, + 482, + 506, + 497 + ], + "score": 1.0, + "content": "help to smooth the discriminator landscape and improve learning speed during the early stages", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 494, + 505, + 506 + ], + "spans": [ + { + "bbox": [ + 105, + 494, + 505, + 506 + ], + "score": 1.0, + "content": "of training, but converges to a worse performance. Policies trained using dual gradient descent to", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 506, + 392, + 517 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 179, + 517 + ], + "score": 1.0, + "content": "adaptively update", + "type": "text" + }, + { + "bbox": [ + 179, + 506, + 187, + 517 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 506, + 392, + 517 + ], + "score": 1.0, + "content": "consistently achieves the best performance overall.", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 39 + }, + { + "type": "title", + "bbox": [ + 106, + 534, + 459, + 545 + ], + "lines": [ + { + "bbox": [ + 105, + 533, + 460, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 460, + 546 + ], + "score": 1.0, + "content": "5.2 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 43 + }, + { + "type": "text", + "bbox": [ + 107, + 556, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 556, + 505, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 556, + 505, + 568 + ], + "score": 1.0, + "content": "Next, we use VAIRL to recover reward functions from demonstrations. Unlike the discriminator", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 567, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 567, + 505, + 579 + ], + "score": 1.0, + "content": "learned by VAIL, the reward function recovered by VAIRL can be re-optimized to train new policies", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 577, + 505, + 591 + ], + "spans": [ + { + "bbox": [ + 105, + 577, + 505, + 591 + ], + "score": 1.0, + "content": "from scratch in the same environment. In some cases, it can also be used to transfer similar behaviour", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 589, + 505, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 505, + 601 + ], + "score": 1.0, + "content": "to different environments. In Figure 7, we show the results of applying VAIRL to the C-maze from", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 600, + 505, + 612 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 505, + 612 + ], + "score": 1.0, + "content": "Fu et al. (2017), and a more complex S-maze; the simple 2D observation spaces of these tasks", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 106, + 612, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 505, + 623 + ], + "score": 1.0, + "content": "make it easy to interpret the recovered reward functions. In both mazes, the expert is trained to", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 622, + 506, + 634 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 506, + 634 + ], + "score": 1.0, + "content": "navigate from a start position at the bottom of the maze to a fixed target position at the top. We use", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 632, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 505, + 645 + ], + "score": 1.0, + "content": "each method to obtain an imitation policy and to approximate the expert’s reward on the original", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 644, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 105, + 644, + 505, + 656 + ], + "score": 1.0, + "content": "maze. The recovered reward is then used to train a new policy to solve a left–right flipped version", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 655, + 504, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 504, + 667 + ], + "score": 1.0, + "content": "of the training maze. On the C-maze, we found that plain AIRL—without a gradient penalty—", + "type": "text" + } + ], + "index": 53 + }, + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "score": 1.0, + "content": "would sometimes overfit and fail to transfer to the new environment, as evidenced by the reward", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 105, + 676, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 505, + 690 + ], + "score": 1.0, + "content": "visualization in Figure 7 (left) and the higher return variance in Figure 7 (right). In contrast, by", + "type": "text" + } + ], + "index": 55 + }, + { + "bbox": [ + 105, + 688, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 506, + 700 + ], + "score": 1.0, + "content": "incorporating a VDB into AIRL, VAIRL learns a substantially smoother reward function that is", + "type": "text" + } + ], + "index": 56 + }, + { + "bbox": [ + 105, + 699, + 505, + 710 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 505, + 710 + ], + "score": 1.0, + "content": "more suitable for transfer. Furthermore, we found that in the S-maze with two internal walls, AIRL", + "type": "text" + } + ], + "index": 57 + }, + { + "bbox": [ + 105, + 710, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 506, + 722 + ], + "score": 1.0, + "content": "was too unstable to acquire a meaningful reward function. 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When trained on the training maze on the left, AIRL learns", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 205, + 505, + 219 + ], + "spans": [ + { + "bbox": [ + 104, + 205, + 505, + 219 + ], + "score": 1.0, + "content": "a reward that overfits to the training task, and which cannot be transferred to the mirrored maze on", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 216, + 505, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 216, + 505, + 230 + ], + "score": 1.0, + "content": "the right. In contrast, VAIRL learns a smoother reward function that enables more-reliable transfer.", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 228, + 505, + 241 + ], + "spans": [ + { + "bbox": [ + 106, + 228, + 495, + 241 + ], + "score": 1.0, + "content": "Right: Performance on flipped test versions of our two training mazes. We report mean return (", + "type": "text" + }, + { + "bbox": [ + 495, + 229, + 505, + 239 + ], + "score": 0.63, + "content": "\\pm", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 239, + 475, + 253 + ], + "spans": [ + { + "bbox": [ + 106, + 239, + 475, + 253 + ], + "score": 1.0, + "content": "std. dev.) over five runs, and the mean return for the expert used to generate demonstrations.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18 + } + ], + "index": 10.75 + }, + { + "type": "table", + "bbox": [ + 299, + 83, + 486, + 191 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 299, + 83, + 486, + 191 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 299, + 83, + 486, + 191 + ], + "spans": [ + { + "bbox": [ + 299, + 83, + 486, + 191 + ], + "score": 0.638, + "html": "
MethodTransferenvironments
C-mazeS-maze
GAIL-24.6±7.21.0±1.3
VAIL-65.6±18.920.8±39.7
AIRL-15.3±7.8-0.2±0.1
AIRL - GP-9.14±0.4-0.14±0.3
VAIRL (β = 0)-25.5±7.262.3±33.2
VAIRL (ours)-10.0±2.274.0±38.7
VAIRL - GP (ours)-9.18±0.4156.5±5.6
TRPO expert-5.1153.2
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VAIL is the only method that", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 345, + 505, + 357 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 505, + 357 + ], + "score": 1.0, + "content": "successfully learns to imitate the skill from the video demonstration. Snapshots of the video demon-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 357, + 505, + 369 + ], + "spans": [ + { + "bbox": [ + 105, + 357, + 505, + 369 + ], + "score": 1.0, + "content": "stration and the simulated motion is available in Figure 5. To further investigate the effects of the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 367, + 505, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 505, + 380 + ], + "score": 1.0, + "content": "VDB, we visualize the gradient of the discriminator with respect to images from the video demon-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 379, + 505, + 390 + ], + "spans": [ + { + "bbox": [ + 106, + 379, + 505, + 390 + ], + "score": 1.0, + "content": "stration and simulation. Saliency maps for discriminators trained with VAIL and GAIL are available", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "score": 1.0, + "content": "in Figure 5. The VAIL discriminator learns to attend to spatially coherent image patches around the", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 399, + 505, + 414 + ], + "spans": [ + { + "bbox": [ + 105, + 399, + 505, + 414 + ], + "score": 1.0, + "content": "character, while the GAIL discriminator exhibits less structure. The magnitude of the gradients from", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 411, + 505, + 424 + ], + "spans": [ + { + "bbox": [ + 106, + 411, + 505, + 424 + ], + "score": 1.0, + "content": "VAIL also tend to be significantly larger than those from GAIL, which may suggests that VAIL is", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 422, + 383, + 435 + ], + "spans": [ + { + "bbox": [ + 105, + 422, + 383, + 435 + ], + "score": 1.0, + "content": "able to mitigate the problem of vanishing gradients present in GAIL.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 31, + "bbox_fs": [ + 105, + 335, + 505, + 435 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 439, + 505, + 516 + ], + "lines": [ + { + "bbox": [ + 105, + 438, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 348, + 452 + ], + "score": 1.0, + "content": "Adaptive Constraint: To evaluate the effects of the adaptive", + "type": "text" + }, + { + "bbox": [ + 349, + 440, + 356, + 451 + ], + "score": 0.85, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 438, + 506, + 452 + ], + "score": 1.0, + "content": "updates, we compare policies trained", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 450, + 505, + 463 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 230, + 463 + ], + "score": 1.0, + "content": "with different fixed values of", + "type": "text" + }, + { + "bbox": [ + 230, + 451, + 238, + 461 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 238, + 450, + 320, + 463 + ], + "score": 1.0, + "content": "and policies where", + "type": "text" + }, + { + "bbox": [ + 320, + 451, + 328, + 462 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 450, + 505, + 463 + ], + "score": 1.0, + "content": "is updated adaptively to enforce a desired", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 461, + 505, + 474 + ], + "spans": [ + { + "bbox": [ + 105, + 461, + 199, + 474 + ], + "score": 1.0, + "content": "information constraint", + "type": "text" + }, + { + "bbox": [ + 199, + 461, + 237, + 472 + ], + "score": 0.9, + "content": "I _ { c } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 461, + 505, + 474 + ], + "score": 1.0, + "content": ". Figure 6 illustrates the learning curves and the KL loss over the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 471, + 506, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 207, + 485 + ], + "score": 1.0, + "content": "course of training. When", + "type": "text" + }, + { + "bbox": [ + 208, + 473, + 215, + 483 + ], + "score": 0.85, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 471, + 506, + 485 + ], + "score": 1.0, + "content": "is too small, performance reverts to that achieved by GAIL. Large values", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 482, + 506, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 117, + 497 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 484, + 125, + 495 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 125, + 482, + 506, + 497 + ], + "score": 1.0, + "content": "help to smooth the discriminator landscape and improve learning speed during the early stages", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 494, + 505, + 506 + ], + "spans": [ + { + "bbox": [ + 105, + 494, + 505, + 506 + ], + "score": 1.0, + "content": "of training, but converges to a worse performance. Policies trained using dual gradient descent to", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 506, + 392, + 517 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 179, + 517 + ], + "score": 1.0, + "content": "adaptively update", + "type": "text" + }, + { + "bbox": [ + 179, + 506, + 187, + 517 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 506, + 392, + 517 + ], + "score": 1.0, + "content": "consistently achieves the best performance overall.", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 39, + "bbox_fs": [ + 105, + 438, + 506, + 517 + ] + }, + { + "type": "title", + "bbox": [ + 106, + 534, + 459, + 545 + ], + "lines": [ + { + "bbox": [ + 105, + 533, + 460, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 460, + 546 + ], + "score": 1.0, + "content": "5.2 VAIRL: VARIATIONAL ADVERSARIAL INVERSE REINFORCEMENT LEARNING", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 43 + }, + { + "type": "text", + "bbox": [ + 107, + 556, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 556, + 505, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 556, + 505, + 568 + ], + "score": 1.0, + "content": "Next, we use VAIRL to recover reward functions from demonstrations. Unlike the discriminator", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 567, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 567, + 505, + 579 + ], + "score": 1.0, + "content": "learned by VAIL, the reward function recovered by VAIRL can be re-optimized to train new policies", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 577, + 505, + 591 + ], + "spans": [ + { + "bbox": [ + 105, + 577, + 505, + 591 + ], + "score": 1.0, + "content": "from scratch in the same environment. In some cases, it can also be used to transfer similar behaviour", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 589, + 505, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 505, + 601 + ], + "score": 1.0, + "content": "to different environments. In Figure 7, we show the results of applying VAIRL to the C-maze from", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 600, + 505, + 612 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 505, + 612 + ], + "score": 1.0, + "content": "Fu et al. (2017), and a more complex S-maze; the simple 2D observation spaces of these tasks", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 106, + 612, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 106, + 612, + 505, + 623 + ], + "score": 1.0, + "content": "make it easy to interpret the recovered reward functions. In both mazes, the expert is trained to", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 622, + 506, + 634 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 506, + 634 + ], + "score": 1.0, + "content": "navigate from a start position at the bottom of the maze to a fixed target position at the top. We use", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 632, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 505, + 645 + ], + "score": 1.0, + "content": "each method to obtain an imitation policy and to approximate the expert’s reward on the original", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 644, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 105, + 644, + 505, + 656 + ], + "score": 1.0, + "content": "maze. The recovered reward is then used to train a new policy to solve a left–right flipped version", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 655, + 504, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 504, + 667 + ], + "score": 1.0, + "content": "of the training maze. On the C-maze, we found that plain AIRL—without a gradient penalty—", + "type": "text" + } + ], + "index": 53 + }, + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "score": 1.0, + "content": "would sometimes overfit and fail to transfer to the new environment, as evidenced by the reward", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 105, + 676, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 505, + 690 + ], + "score": 1.0, + "content": "visualization in Figure 7 (left) and the higher return variance in Figure 7 (right). In contrast, by", + "type": "text" + } + ], + "index": 55 + }, + { + "bbox": [ + 105, + 688, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 506, + 700 + ], + "score": 1.0, + "content": "incorporating a VDB into AIRL, VAIRL learns a substantially smoother reward function that is", + "type": "text" + } + ], + "index": 56 + }, + { + "bbox": [ + 105, + 699, + 505, + 710 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 505, + 710 + ], + "score": 1.0, + "content": "more suitable for transfer. Furthermore, we found that in the S-maze with two internal walls, AIRL", + "type": "text" + } + ], + "index": 57 + }, + { + "bbox": [ + 105, + 710, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 506, + 722 + ], + "score": 1.0, + "content": "was too unstable to acquire a meaningful reward function. This was true even with the use of a", + "type": "text" + } + ], + "index": 58 + }, + { + "bbox": [ + 105, + 721, + 506, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 506, + 732 + ], + "score": 1.0, + "content": "gradient penalty. In contrast, VAIRL was able to learn a reasonable reward in most cases without a", + "type": "text" + } + ], + "index": 59 + }, + { + "bbox": [ + 105, + 327, + 505, + 340 + ], + "spans": [ + { + "bbox": [ + 105, + 327, + 505, + 340 + ], + "score": 1.0, + "content": "gradient penalty, and its performance improved even further with the addition of a gradient penalty.", + "type": "text", + "cross_page": true + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "score": 1.0, + "content": "To evaluate the effects of the VDB, we observe that the performance of VAIRL drops on both tasks", + "type": "text", + "cross_page": true + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 349, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 349, + 248, + 362 + ], + "score": 1.0, + "content": "when the KL constraint is disabled", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 249, + 349, + 275, + 361 + ], + "score": 0.89, + "content": "\\mathcal { B } = 0", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 276, + 349, + 506, + 362 + ], + "score": 1.0, + "content": "), suggesting that the improvements from the VDB cannot", + "type": "text", + "cross_page": true + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 361, + 505, + 373 + ], + "spans": [ + { + "bbox": [ + 106, + 361, + 505, + 373 + ], + "score": 1.0, + "content": "be attributed entirely to the noise introduced by the sampling process for z. Further details of these", + "type": "text", + "cross_page": true + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 371, + 477, + 384 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 477, + 384 + ], + "score": 1.0, + "content": "experiments and illustrations of the recovered reward functions are available in Appendix D.", + "type": "text", + "cross_page": true + } + ], + "index": 13 + } + ], + "index": 51.5, + "bbox_fs": [ + 105, + 556, + 506, + 732 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 127, + 79, + 483, + 200 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 127, + 79, + 483, + 200 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 127, + 79, + 483, + 200 + ], + "spans": [ + { + "bbox": [ + 127, + 79, + 483, + 200 + ], + "score": 0.87, + "type": "image", + "image_path": "c86c34eae7b7dab70e64c321c0f81908e190aa387a041d3cc2f92e4b2ee908cc.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 127, + 79, + 483, + 119.33333333333334 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 127, + 119.33333333333334, + 483, + 159.66666666666669 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 127, + 159.66666666666669, + 483, + 200.00000000000003 + ], + "spans": [], + "index": 2 + } + ] + } + ], + "index": 1 + }, + { + "type": "image", + "bbox": [ + 108, + 226, + 504, + 306 + ], + "blocks": [ + { + "type": "image_caption", + "bbox": [ + 106, + 203, + 504, + 225 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 203, + 506, + 216 + ], + "spans": [ + { + "bbox": [ + 105, + 203, + 506, + 216 + ], + "score": 1.0, + "content": "Figure 8: Comparison of VGAN and other methods on CIFAR-10, with performance evaluated", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 214, + 282, + 226 + ], + "spans": [ + { + "bbox": [ + 106, + 214, + 282, + 226 + ], + "score": 1.0, + "content": "using the Frechet Inception Distance (FID). ´", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + }, + { + "type": "image_body", + "bbox": [ + 108, + 226, + 504, + 306 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 108, + 226, + 504, + 306 + ], + "spans": [ + { + "bbox": [ + 108, + 226, + 504, + 306 + ], + "score": 0.967, + "type": "image", + "image_path": "78b0c0503897ba4746233494cfd31890b086ca770f3439471530fef4c520776d.jpg" + } + ] + } + ], + "index": 6, + "virtual_lines": [ + { + "bbox": [ + 108, + 226, + 504, + 252.66666666666666 + ], + "spans": [], + "index": 5 + }, + { + "bbox": [ + 108, + 252.66666666666666, + 504, + 279.3333333333333 + ], + "spans": [], + "index": 6 + }, + { + "bbox": [ + 108, + 279.3333333333333, + 504, + 306.0 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 123, + 312, + 484, + 323 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 126, + 311, + 485, + 325 + ], + "spans": [ + { + "bbox": [ + 126, + 311, + 325, + 325 + ], + "score": 1.0, + "content": "Figure 9: VGAN samples on CIFAR-10, CelebA", + "type": "text" + }, + { + "bbox": [ + 325, + 311, + 363, + 323 + ], + "score": 0.84, + "content": "1 2 8 \\times 1 2 8", + "type": "inline_equation" + }, + { + "bbox": [ + 364, + 311, + 432, + 325 + ], + "score": 1.0, + "content": ", and CelebAHQ", + "type": "text" + }, + { + "bbox": [ + 432, + 311, + 480, + 323 + ], + "score": 0.85, + "content": "1 0 2 4 \\times 1 0 2 4", + "type": "inline_equation" + }, + { + "bbox": [ + 481, + 311, + 485, + 325 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 107, + 327, + 505, + 382 + ], + "lines": [ + { + "bbox": [ + 105, + 327, + 505, + 340 + ], + "spans": [ + { + "bbox": [ + 105, + 327, + 505, + 340 + ], + "score": 1.0, + "content": "gradient penalty, and its performance improved even further with the addition of a gradient penalty.", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "score": 1.0, + "content": "To evaluate the effects of the VDB, we observe that the performance of VAIRL drops on both tasks", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 349, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 349, + 248, + 362 + ], + "score": 1.0, + "content": "when the KL constraint is disabled", + "type": "text" + }, + { + "bbox": [ + 249, + 349, + 275, + 361 + ], + "score": 0.89, + "content": "\\mathcal { B } = 0", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 349, + 506, + 362 + ], + "score": 1.0, + "content": "), suggesting that the improvements from the VDB cannot", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 361, + 505, + 373 + ], + "spans": [ + { + "bbox": [ + 106, + 361, + 505, + 373 + ], + "score": 1.0, + "content": "be attributed entirely to the noise introduced by the sampling process for z. Further details of these", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 371, + 477, + 384 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 477, + 384 + ], + "score": 1.0, + "content": "experiments and illustrations of the recovered reward functions are available in Appendix D.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 11 + }, + { + "type": "title", + "bbox": [ + 109, + 390, + 403, + 402 + ], + "lines": [ + { + "bbox": [ + 106, + 389, + 405, + 403 + ], + "spans": [ + { + "bbox": [ + 106, + 389, + 405, + 403 + ], + "score": 1.0, + "content": "5.3 VGAN: VARIATIONAL GENERATIVE ADVERSARIAL NETWORKS", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 14 + }, + { + "type": "text", + "bbox": [ + 107, + 410, + 505, + 619 + ], + "lines": [ + { + "bbox": [ + 106, + 411, + 505, + 423 + ], + "spans": [ + { + "bbox": [ + 106, + 411, + 505, + 423 + ], + "score": 1.0, + "content": "Finally, we apply the VDB to image generation with generative adversarial networks, which we", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 423, + 505, + 434 + ], + "spans": [ + { + "bbox": [ + 106, + 423, + 505, + 434 + ], + "score": 1.0, + "content": "refer to as VGAN. Experiment are conducted on CIFAR-10 (Krizhevsky et al.), CelebA (Liu et al.", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 433, + 505, + 445 + ], + "spans": [ + { + "bbox": [ + 106, + 433, + 505, + 445 + ], + "score": 1.0, + "content": "(2015)), and CelebAHQ (Karras et al., 2018) datasets. We compare our approach to recent stabi-", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "score": 1.0, + "content": "lization techniques: WGAN-GP (Gulrajani et al., 2017b), instance noise (Sønderby et al., 2016;", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 454, + 505, + 468 + ], + "spans": [ + { + "bbox": [ + 105, + 454, + 505, + 468 + ], + "score": 1.0, + "content": "Arjovsky & Bottou, 2017), spectral normalization (SN) (Miyato et al., 2018), and gradient penalty", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "score": 1.0, + "content": "(GP) (Mescheder et al., 2018), as well as the original GAN (Goodfellow et al., 2014) on CIFAR-", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 476, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 106, + 476, + 505, + 489 + ], + "score": 1.0, + "content": "10. To measure performance, we report the Frechet Inception Distance (FID) (Heusel et al., 2017), ´", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "score": 1.0, + "content": "which has been shown to be more consistent with human evaluation. All methods are implemented", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "score": 1.0, + "content": "using the same base model, built on the resnet architecture of Mescheder et al. (2018). Aside from", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 509, + 505, + 522 + ], + "spans": [ + { + "bbox": [ + 106, + 509, + 208, + 522 + ], + "score": 1.0, + "content": "tuning the KL constraint", + "type": "text" + }, + { + "bbox": [ + 208, + 510, + 218, + 521 + ], + "score": 0.88, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 509, + 505, + 522 + ], + "score": 1.0, + "content": "for VGAN, no additional hyperparameter optimization was performed", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 520, + 505, + 533 + ], + "spans": [ + { + "bbox": [ + 106, + 520, + 505, + 533 + ], + "score": 1.0, + "content": "to modify the settings provided by Mescheder et al. (2018). The performance of the various methods", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 530, + 506, + 545 + ], + "spans": [ + { + "bbox": [ + 105, + 530, + 506, + 545 + ], + "score": 1.0, + "content": "on CIFAR-10 are shown in Figure 8. While vanilla GAN and instance noise are prone to diverging", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 542, + 506, + 556 + ], + "spans": [ + { + "bbox": [ + 104, + 542, + 506, + 556 + ], + "score": 1.0, + "content": "as training progresses, VGAN remains stable. 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This experiment again highlights that there is a signif-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 564, + 505, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 505, + 577 + ], + "score": 1.0, + "content": "icant improvement from imposing the information bottleneck over simply adding instance noise.", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 576, + 505, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 576, + 505, + 587 + ], + "score": 1.0, + "content": "Combining both VDB and gradient penalty (VGAN - GP) achieves the best performance overall", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 587, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 505, + 598 + ], + "score": 1.0, + "content": "with an FID of 18.1. We also experimented with combining the VDB with SN, but this combination", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 597, + 506, + 610 + ], + "spans": [ + { + "bbox": [ + 105, + 597, + 506, + 610 + ], + "score": 1.0, + "content": "is prone to diverging. See Figure 9 for samples of images generated with our approach. Please refer", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 608, + 335, + 621 + ], + "spans": [ + { + "bbox": [ + 106, + 608, + 335, + 621 + ], + "score": 1.0, + "content": "to Appendix E for experimental details and more results.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 24 + }, + { + "type": "title", + "bbox": [ + 107, + 635, + 195, + 648 + ], + "lines": [ + { + "bbox": [ + 105, + 634, + 197, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 634, + 197, + 651 + ], + "score": 1.0, + "content": "6 CONCLUSION", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 107, + 655, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "We present the variational discriminator bottleneck, a general regularization technique for adver-", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 666, + 505, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 679 + ], + "score": 1.0, + "content": "sarial learning. Our experiments show that the VDB is broadly applicable to a variety of domains,", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 677, + 504, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 504, + 689 + ], + "score": 1.0, + "content": "and yields significant improvements over previous techniques on a number of challenging tasks.", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 688, + 505, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 688, + 505, + 700 + ], + "score": 1.0, + "content": "While our experiments have produced promising results for video imitation, the results have been", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "primarily with videos of synthetic scenes. 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We compare our approach to recent stabi-", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 505, + 457 + ], + "score": 1.0, + "content": "lization techniques: WGAN-GP (Gulrajani et al., 2017b), instance noise (Sønderby et al., 2016;", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 454, + 505, + 468 + ], + "spans": [ + { + "bbox": [ + 105, + 454, + 505, + 468 + ], + "score": 1.0, + "content": "Arjovsky & Bottou, 2017), spectral normalization (SN) (Miyato et al., 2018), and gradient penalty", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 478 + ], + "score": 1.0, + "content": "(GP) (Mescheder et al., 2018), as well as the original GAN (Goodfellow et al., 2014) on CIFAR-", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 476, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 106, + 476, + 505, + 489 + ], + "score": 1.0, + "content": "10. To measure performance, we report the Frechet Inception Distance (FID) (Heusel et al., 2017), ´", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 506, + 500 + ], + "score": 1.0, + "content": "which has been shown to be more consistent with human evaluation. All methods are implemented", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "score": 1.0, + "content": "using the same base model, built on the resnet architecture of Mescheder et al. (2018). Aside from", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 509, + 505, + 522 + ], + "spans": [ + { + "bbox": [ + 106, + 509, + 208, + 522 + ], + "score": 1.0, + "content": "tuning the KL constraint", + "type": "text" + }, + { + "bbox": [ + 208, + 510, + 218, + 521 + ], + "score": 0.88, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 219, + 509, + 505, + 522 + ], + "score": 1.0, + "content": "for VGAN, no additional hyperparameter optimization was performed", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 520, + 505, + 533 + ], + "spans": [ + { + "bbox": [ + 106, + 520, + 505, + 533 + ], + "score": 1.0, + "content": "to modify the settings provided by Mescheder et al. (2018). The performance of the various methods", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 530, + 506, + 545 + ], + "spans": [ + { + "bbox": [ + 105, + 530, + 506, + 545 + ], + "score": 1.0, + "content": "on CIFAR-10 are shown in Figure 8. While vanilla GAN and instance noise are prone to diverging", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 542, + 506, + 556 + ], + "spans": [ + { + "bbox": [ + 104, + 542, + 506, + 556 + ], + "score": 1.0, + "content": "as training progresses, VGAN remains stable. Note that instance noise can be seen as a non-adaptive", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 552, + 505, + 567 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 271, + 567 + ], + "score": 1.0, + "content": "version of VGAN without constraints on", + "type": "text" + }, + { + "bbox": [ + 272, + 554, + 281, + 564 + ], + "score": 0.86, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 552, + 505, + 567 + ], + "score": 1.0, + "content": ". This experiment again highlights that there is a signif-", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 564, + 505, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 505, + 577 + ], + "score": 1.0, + "content": "icant improvement from imposing the information bottleneck over simply adding instance noise.", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 576, + 505, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 576, + 505, + 587 + ], + "score": 1.0, + "content": "Combining both VDB and gradient penalty (VGAN - GP) achieves the best performance overall", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 587, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 505, + 598 + ], + "score": 1.0, + "content": "with an FID of 18.1. We also experimented with combining the VDB with SN, but this combination", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 597, + 506, + 610 + ], + "spans": [ + { + "bbox": [ + 105, + 597, + 506, + 610 + ], + "score": 1.0, + "content": "is prone to diverging. See Figure 9 for samples of images generated with our approach. Please refer", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 608, + 335, + 621 + ], + "spans": [ + { + "bbox": [ + 106, + 608, + 335, + 621 + ], + "score": 1.0, + "content": "to Appendix E for experimental details and more results.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 24, + "bbox_fs": [ + 104, + 411, + 506, + 621 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 635, + 195, + 648 + ], + "lines": [ + { + "bbox": [ + 105, + 634, + 197, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 634, + 197, + 651 + ], + "score": 1.0, + "content": "6 CONCLUSION", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 107, + 655, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "We present the variational discriminator bottleneck, a general regularization technique for adver-", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 666, + 505, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 679 + ], + "score": 1.0, + "content": "sarial learning. Our experiments show that the VDB is broadly applicable to a variety of domains,", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 677, + 504, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 504, + 689 + ], + "score": 1.0, + "content": "and yields significant improvements over previous techniques on a number of challenging tasks.", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 688, + 505, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 688, + 505, + 700 + ], + "score": 1.0, + "content": "While our experiments have produced promising results for video imitation, the results have been", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "primarily with videos of synthetic scenes. 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First, we assume a", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 104, + 159, + 506, + 174 + ], + "spans": [ + { + "bbox": [ + 104, + 159, + 241, + 174 + ], + "score": 1.0, + "content": "pointwise constraint of the form", + "type": "text" + }, + { + "bbox": [ + 241, + 160, + 340, + 172 + ], + "score": 0.91, + "content": "\\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) \\| r ( \\mathbf { z } ) ] \\leq I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 159, + 370, + 174 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 370, + 162, + 378, + 170 + ], + "score": 0.41, + "content": "\\mathbf { x }", + "type": "inline_equation" + }, + { + "bbox": [ + 378, + 159, + 506, + 174 + ], + "score": 1.0, + "content": ". In reality, we use an average", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 170, + 506, + 183 + ], + "spans": [ + { + "bbox": [ + 105, + 170, + 506, + 183 + ], + "score": 1.0, + "content": "KL constraint, since we found it to be more convenient to optimize, though a pointwise constraint", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 182, + 505, + 194 + ], + "spans": [ + { + "bbox": [ + 105, + 182, + 426, + 194 + ], + "score": 1.0, + "content": "is also possible to enforce by using the largest constraint violation to increment", + "type": "text" + }, + { + "bbox": [ + 427, + 182, + 434, + 193 + ], + "score": 0.8, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 434, + 182, + 505, + 194 + ], + "score": 1.0, + "content": ". We could likely", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 193, + 505, + 205 + ], + "spans": [ + { + "bbox": [ + 105, + 193, + 505, + 205 + ], + "score": 1.0, + "content": "also extend the analysis to the average constraint, though we leave this to future work. The main", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 204, + 261, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 204, + 261, + 215 + ], + "score": 1.0, + "content": "theorem can then be stated as follows:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 5 + }, + { + "type": "text", + "bbox": [ + 107, + 220, + 505, + 265 + ], + "lines": [ + { + "bbox": [ + 105, + 219, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 186, + 233 + ], + "score": 1.0, + "content": "Theorem A.1. Let", + "type": "text" + }, + { + "bbox": [ + 186, + 220, + 206, + 232 + ], + "score": 0.9, + "content": "g ( \\mathbf { u } )", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 219, + 420, + 233 + ], + "score": 1.0, + "content": "denote the generator’s mapping from a noise vector", + "type": "text" + }, + { + "bbox": [ + 420, + 221, + 462, + 232 + ], + "score": 0.91, + "content": "\\mathbf { u } \\sim p ( \\mathbf { u } )", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 219, + 506, + 233 + ], + "score": 1.0, + "content": "to a point", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 231, + 506, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 117, + 244 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 232, + 127, + 241 + ], + "score": 0.79, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 231, + 266, + 244 + ], + "score": 1.0, + "content": ". Given the generator distribution", + "type": "text" + }, + { + "bbox": [ + 266, + 232, + 289, + 243 + ], + "score": 0.89, + "content": "G ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 231, + 378, + 244 + ], + "score": 1.0, + "content": "and data distribution", + "type": "text" + }, + { + "bbox": [ + 378, + 232, + 402, + 243 + ], + "score": 0.91, + "content": "p ^ { * } ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 231, + 506, + 244 + ], + "score": 1.0, + "content": ", a VDB with an encoder", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 241, + 506, + 257 + ], + "spans": [ + { + "bbox": [ + 107, + 242, + 206, + 254 + ], + "score": 0.91, + "content": "E ( \\mathbf { z } | \\mathbf { x } ) = \\mathcal { N } ( \\mu _ { E } ( \\mathbf { x } ) , \\Sigma )", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 241, + 228, + 257 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + 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"content": "is also possible, but more involved.", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 407, + 505, + 422 + ], + "spans": [ + { + "bbox": [ + 105, + 407, + 343, + 422 + ], + "score": 1.0, + "content": "We’ll further assume below for notational simplicity that", + "type": "text" + }, + { + "bbox": [ + 343, + 410, + 352, + 419 + ], + "score": 0.8, + "content": "\\Sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 407, + 489, + 422 + ], + "score": 1.0, + "content": "is diagonal with diagonal values", + "type": "text" + }, + { + "bbox": [ + 489, + 408, + 501, + 419 + ], + "score": 0.87, + "content": "\\sigma ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 407, + 505, + 422 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 419, + 505, + 433 + ], + "spans": [ + { + "bbox": [ + 105, + 419, + 505, + 433 + ], + "score": 1.0, + "content": "This assumption is not required, but substantially simplifies the linear algebra. Analogously to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 430, + 505, + 444 + ], + "spans": [ + { + "bbox": [ + 105, + 430, + 505, + 444 + ], + "score": 1.0, + "content": "Theorem 3.2 from Arjovsky & Bottou (2017), this theorem states that the gradient of the generator", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 442, + 506, + 455 + ], + "spans": [ + { + "bbox": [ + 105, + 442, + 506, + 455 + ], + "score": 1.0, + "content": "points in the direction of points in the data distribution, and away from points in the generator", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 452, + 505, + 465 + ], + "spans": [ + { + "bbox": [ + 105, + 452, + 505, + 465 + ], + "score": 1.0, + "content": "distribution. However, going beyond the theorem in Arjovsky & Bottou (2017), this result states", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 104, + 462, + 506, + 478 + ], + "spans": [ + { + "bbox": [ + 104, + 462, + 302, + 478 + ], + "score": 1.0, + "content": "that the coefficients on these vectors, given by", + "type": "text" + }, + { + "bbox": [ + 302, + 464, + 366, + 476 + ], + "score": 0.92, + "content": "E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 367, + 462, + 506, + 478 + ], + "score": 1.0, + "content": ", are always bounded below by a", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 475, + 506, + 488 + ], + "spans": [ + { + "bbox": [ + 106, + 475, + 275, + 488 + ], + "score": 1.0, + "content": "value that approaches a positive constant", + "type": "text" + }, + { + "bbox": [ + 276, + 475, + 282, + 485 + ], + "score": 0.76, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 475, + 347, + 488 + ], + "score": 1.0, + "content": "as we decrease", + "type": "text" + }, + { + "bbox": [ + 347, + 476, + 357, + 486 + ], + "score": 0.86, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 475, + 506, + 488 + ], + "score": 1.0, + "content": ", meaning that the gradient does not", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 486, + 506, + 499 + ], + "spans": [ + { + "bbox": [ + 105, + 486, + 506, + 499 + ], + "score": 1.0, + "content": "vanish. The proof of the first part of this theorem is essentially identical to the proof presented", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 497, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 505, + 509 + ], + "score": 1.0, + "content": "by Arjovsky & Bottou (2017), but accounting for the fact that the noise is now injected into the", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 506, + 504, + 522 + ], + "spans": [ + { + "bbox": [ + 104, + 506, + 356, + 522 + ], + "score": 1.0, + "content": "latent space of the VDB, rather than being added directly to", + "type": "text" + }, + { + "bbox": [ + 357, + 509, + 364, + 518 + ], + "score": 0.61, + "content": "\\mathbf { x }", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 506, + 473, + 522 + ], + "score": 1.0, + "content": ". 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^ { * } ( \\mathbf { z } ) = \\frac { p ^ { * } ( \\mathbf { z } ) } { p ^ { * } ( \\mathbf { z } ) + G ( \\mathbf { z } ) }", + "type": "interline_equation", + "image_path": "e6f732f58b2e640f809d173c04ce002eb98408d2d88396e38061b6d9907ee6c1.jpg" + } + ] + } + ], + "index": 38, + "virtual_lines": [ + { + "bbox": [ + 256, + 709, + 355, + 735 + ], + "spans": [], + "index": 38 + } + ] + } + ], + "page_idx": 14, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "score": 1.0, + "content": "15", 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First, we assume a", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 104, + 159, + 506, + 174 + ], + "spans": [ + { + "bbox": [ + 104, + 159, + 241, + 174 + ], + "score": 1.0, + "content": "pointwise constraint of the form", + "type": "text" + }, + { + "bbox": [ + 241, + 160, + 340, + 172 + ], + "score": 0.91, + "content": "\\mathrm { K L } [ E ( \\mathbf { z } | \\mathbf { x } ) \\| r ( \\mathbf { z } ) ] \\leq I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 159, + 370, + 174 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 370, + 162, + 378, + 170 + ], + "score": 0.41, + "content": "\\mathbf { x }", + "type": "inline_equation" + }, + { + "bbox": [ + 378, + 159, + 506, + 174 + ], + "score": 1.0, + "content": ". 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We could likely", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 193, + 505, + 205 + ], + "spans": [ + { + "bbox": [ + 105, + 193, + 505, + 205 + ], + "score": 1.0, + "content": "also extend the analysis to the average constraint, though we leave this to future work. The main", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 204, + 261, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 204, + 261, + 215 + ], + "score": 1.0, + "content": "theorem can then be stated as follows:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 5, + "bbox_fs": [ + 104, + 138, + 506, + 215 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 220, + 505, + 265 + ], + "lines": [ + { + "bbox": [ + 105, + 219, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 186, + 233 + ], + "score": 1.0, + "content": "Theorem A.1. Let", + "type": "text" + }, + { + "bbox": [ + 186, + 220, + 206, + 232 + ], + "score": 0.9, + "content": "g ( \\mathbf { u } )", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 219, + 420, + 233 + ], + "score": 1.0, + "content": "denote the generator’s mapping from a noise vector", + "type": "text" + }, + { + "bbox": [ + 420, + 221, + 462, + 232 + ], + "score": 0.91, + "content": "\\mathbf { u } \\sim p ( \\mathbf { u } )", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 219, + 506, + 233 + ], + "score": 1.0, + "content": "to a point", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 231, + 506, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 117, + 244 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 232, + 127, + 241 + ], + "score": 0.79, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 231, + 266, + 244 + ], + "score": 1.0, + "content": ". Given the generator distribution", + "type": "text" + }, + { + "bbox": [ + 266, + 232, + 289, + 243 + ], + "score": 0.89, + "content": "G ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 231, + 378, + 244 + ], + "score": 1.0, + "content": "and data distribution", + "type": "text" + }, + { + "bbox": [ + 378, + 232, + 402, + 243 + ], + "score": 0.91, + "content": "p ^ { * } ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 403, + 231, + 506, + 244 + ], + "score": 1.0, + "content": ", a VDB with an encoder", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 241, + 506, + 257 + ], + "spans": [ + { + "bbox": [ + 107, + 242, + 206, + 254 + ], + "score": 0.91, + "content": "E ( \\mathbf { z } | \\mathbf { x } ) = \\mathcal { N } ( \\mu _ { E } ( \\mathbf { x } ) , \\Sigma )", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 241, + 228, + 257 + ], + "score": 1.0, + "content": ", and", + "type": "text" + }, + { + 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"C ( I _ { c } ) \\delta > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 492, + 362, + 506, + 378 + ], + "score": 1.0, + "content": "as", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 374, + 141, + 389 + ], + "spans": [ + { + "bbox": [ + 106, + 376, + 136, + 387 + ], + "score": 0.89, + "content": "I _ { c } \\to 0", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 374, + 141, + 389 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17, + "bbox_fs": [ + 105, + 352, + 506, + 389 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 397, + 505, + 541 + ], + "lines": [ + { + "bbox": [ + 106, + 398, + 505, + 411 + ], + "spans": [ + { + "bbox": [ + 106, + 398, + 339, + 411 + ], + "score": 1.0, + "content": "Analysis for an encoder with an input-dependent variance", + "type": "text" + }, + { + "bbox": [ + 339, + 398, + 361, + 410 + ], + "score": 0.91, + "content": "\\Sigma ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 398, + 505, + 411 + ], + "score": 1.0, + "content": "is also possible, but more involved.", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 407, + 505, + 422 + ], + "spans": [ + { + "bbox": [ + 105, + 407, + 343, + 422 + ], + "score": 1.0, + "content": "We’ll further assume below for notational simplicity that", + "type": "text" + }, + { + "bbox": [ + 343, + 410, + 352, + 419 + ], + "score": 0.8, + "content": "\\Sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 407, + 489, + 422 + ], + "score": 1.0, + "content": "is diagonal with diagonal values", + "type": "text" + }, + { + "bbox": [ + 489, + 408, + 501, + 419 + ], + "score": 0.87, + "content": "\\sigma ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 407, + 505, + 422 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 419, + 505, + 433 + ], + "spans": [ + { + "bbox": [ + 105, + 419, + 505, + 433 + ], + "score": 1.0, + "content": "This assumption is not required, but substantially simplifies the linear algebra. Analogously to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 430, + 505, + 444 + ], + "spans": [ + { + "bbox": [ + 105, + 430, + 505, + 444 + ], + "score": 1.0, + "content": "Theorem 3.2 from Arjovsky & Bottou (2017), this theorem states that the gradient of the generator", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 442, + 506, + 455 + ], + "spans": [ + { + "bbox": [ + 105, + 442, + 506, + 455 + ], + "score": 1.0, + "content": "points in the direction of points in the data distribution, and away from points in the generator", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 452, + 505, + 465 + ], + "spans": [ + { + "bbox": [ + 105, + 452, + 505, + 465 + ], + "score": 1.0, + "content": "distribution. However, going beyond the theorem in Arjovsky & Bottou (2017), this result states", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 104, + 462, + 506, + 478 + ], + "spans": [ + { + "bbox": [ + 104, + 462, + 302, + 478 + ], + "score": 1.0, + "content": "that the coefficients on these vectors, given by", + "type": "text" + }, + { + "bbox": [ + 302, + 464, + 366, + 476 + ], + "score": 0.92, + "content": "E ( \\mu _ { E } ( g ( \\mathbf { u } ) ) | \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 367, + 462, + 506, + 478 + ], + "score": 1.0, + "content": ", are always bounded below by a", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 475, + 506, + 488 + ], + "spans": [ + { + "bbox": [ + 106, + 475, + 275, + 488 + ], + "score": 1.0, + "content": "value that approaches a positive constant", + "type": "text" + }, + { + "bbox": [ + 276, + 475, + 282, + 485 + ], + "score": 0.76, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 475, + 347, + 488 + ], + "score": 1.0, + "content": "as we decrease", + "type": "text" + }, + { + "bbox": [ + 347, + 476, + 357, + 486 + ], + "score": 0.86, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 475, + 506, + 488 + ], + "score": 1.0, + "content": ", meaning that the gradient does not", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 486, + 506, + 499 + ], + "spans": [ + { + "bbox": [ + 105, + 486, + 506, + 499 + ], + "score": 1.0, + "content": "vanish. The proof of the first part of this theorem is essentially identical to the proof presented", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 497, + 505, + 509 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 505, + 509 + ], + "score": 1.0, + "content": "by Arjovsky & Bottou (2017), but accounting for the fact that the noise is now injected into the", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 506, + 504, + 522 + ], + "spans": [ + { + "bbox": [ + 104, + 506, + 356, + 522 + ], + "score": 1.0, + "content": "latent space of the VDB, rather than being added directly to", + "type": "text" + }, + { + "bbox": [ + 357, + 509, + 364, + 518 + ], + "score": 0.61, + "content": "\\mathbf { x }", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 506, + 473, + 522 + ], + "score": 1.0, + "content": ". This result assumes that", + "type": "text" + }, + { + "bbox": [ + 473, + 507, + 504, + 520 + ], + "score": 0.92, + "content": "E ( { \\bf z } | { \\bf x } )", + "type": "inline_equation" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 518, + 506, + 532 + ], + "spans": [ + { + "bbox": [ + 105, + 518, + 293, + 532 + ], + "score": 1.0, + "content": "has a learned but input-independent variance", + "type": "text" + }, + { + "bbox": [ + 293, + 518, + 334, + 529 + ], + "score": 0.92, + "content": "\\Sigma = \\sigma ^ { 2 } I", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 518, + 506, + 532 + ], + "score": 1.0, + "content": ", though the proof can be repeated for an", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 529, + 252, + 542 + ], + "spans": [ + { + "bbox": [ + 106, + 529, + 240, + 542 + ], + "score": 1.0, + "content": "input-dependent or non-diagonal", + "type": "text" + }, + { + "bbox": [ + 240, + 530, + 248, + 540 + ], + "score": 0.8, + "content": "\\Sigma", + "type": "inline_equation" + }, + { + "bbox": [ + 248, + 529, + 252, + 542 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 25, + "bbox_fs": [ + 104, + 398, + 506, + 542 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 565, + 504, + 589 + ], + "lines": [ + { + "bbox": [ + 106, + 565, + 505, + 578 + ], + "spans": [ + { + "bbox": [ + 106, + 565, + 188, + 578 + ], + "score": 1.0, + "content": "Proof. Overloading", + "type": "text" + }, + { + "bbox": [ + 188, + 566, + 213, + 578 + ], + "score": 0.93, + "content": "p ^ { * } ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 213, + 565, + 231, + 578 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 231, + 566, + 254, + 578 + ], + "score": 0.92, + "content": "G ( \\mathbf { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 565, + 270, + 578 + ], + "score": 1.0, + "content": ", let", + "type": "text" + }, + { + "bbox": [ + 271, + 566, + 294, + 578 + ], + "score": 0.92, + "content": "p ^ { * } ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 565, + 312, + 578 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 313, + 566, + 334, + 578 + ], + "score": 0.92, + "content": "G ( \\mathbf { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 565, + 472, + 578 + ], + "score": 1.0, + "content": "be the 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u } ) ) ) } { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\right] } \\\\ & { \\qquad = \\mathbb { E } _ { \\mathbf { u } \\sim p ( \\mathbf { u } ) } \\left[ \\frac { 1 } { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\nabla _ { g } \\left[ - p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right] \\right. } \\\\ & { \\qquad \\left. - \\frac { 1 } { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) + G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\frac { p ^ { * } ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } { G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) } \\nabla _ { g } \\left[ - G ( \\mu _ { E } ( g ( \\mathbf { u } ) ) ) \\right] \\right] . } \\end{array}", + "type": "interline_equation", + "image_path": "c3c05677a3c537c8dc45362d8aa1f15402b3061d3c7d69569b0300e521294a24.jpg" + } + ] + } + ], + "index": 2, + "virtual_lines": [ + { + "bbox": [ + 122, + 100, + 491, + 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The gradient penalty is applied only to real samples", + "type": "text" + }, + { + "bbox": [ + 381, + 249, + 405, + 261 + ], + "score": 0.92, + "content": "p ^ { * } ( x )", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 248, + 506, + 261 + ], + "score": 1.0, + "content": ". We have experimented", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 259, + 505, + 272 + ], + "spans": [ + { + "bbox": [ + 106, + 259, + 505, + 272 + ], + "score": 1.0, + "content": "with apply the penalty to both real and fake samples, but found that performance was worse than", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 271, + 505, + 283 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 505, + 283 + ], + "score": 1.0, + "content": "penalizing only gradients from real samples. This is consistent with the GP implementation from", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 281, + 206, + 294 + ], + "spans": [ + { + "bbox": [ + 105, + 281, + 206, + 294 + ], + "score": 1.0, + "content": "Mescheder et al. (2018).", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 8.5 + }, + { + "type": "title", + "bbox": [ + 107, + 309, + 241, + 322 + ], + "lines": [ + { + "bbox": [ + 106, + 308, + 242, + 324 + ], + "spans": [ + { + "bbox": [ + 106, + 308, + 242, + 324 + ], + "score": 1.0, + "content": "C IMITATION LEARNING", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 333, + 505, + 499 + ], + "lines": [ + { + "bbox": [ + 106, + 334, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 106, + 334, + 506, + 347 + ], + "score": 1.0, + "content": "Experimental Setup: The goal of the motion imitation tasks is to train a simulated agent to mimic a", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 345, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 506, + 358 + ], + "score": 1.0, + "content": "demonstration provided in the form of a mocap clip recorded from a human actor. 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(2018).", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 8.5, + "bbox_fs": [ + 105, + 226, + 506, + 294 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 309, + 241, + 322 + ], + "lines": [ + { + "bbox": [ + 106, + 308, + 242, + 324 + ], + "spans": [ + { + "bbox": [ + 106, + 308, + 242, + 324 + ], + "score": 1.0, + "content": "C IMITATION LEARNING", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 333, + 505, + 499 + ], + "lines": [ + { + "bbox": [ + 106, + 334, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 106, + 334, + 506, + 347 + ], + "score": 1.0, + "content": "Experimental Setup: The goal of the motion imitation tasks is to train a simulated agent to mimic a", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 345, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 506, + 358 + ], + "score": 1.0, + "content": "demonstration provided in the form of a mocap clip recorded from a human actor. 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We also include a phase variable", + "type": "text" + }, + { + "bbox": [ + 304, + 378, + 343, + 390 + ], + "score": 0.92, + "content": "\\phi \\in [ 0 , 1 ]", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 377, + 505, + 390 + ], + "score": 1.0, + "content": "among the state features, which records", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 389, + 506, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 506, + 402 + ], + "score": 1.0, + "content": "the character’s progress along the motion and helps to synchronize the character with the reference", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 400, + 506, + 412 + ], + "spans": [ + { + "bbox": [ + 105, + 400, + 506, + 412 + ], + "score": 1.0, + "content": "motion. With 0 and 1 denoting the start and end of the motion respectively. The action a sampled", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 411, + 506, + 424 + ], + "spans": [ + { + "bbox": [ + 106, + 411, + 173, + 424 + ], + "score": 1.0, + "content": "from the policy", + "type": "text" + }, + { + "bbox": [ + 173, + 411, + 201, + 423 + ], + "score": 0.94, + "content": "\\pi ( \\mathbf { a } | \\mathbf { s } )", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 411, + 506, + 424 + ], + "score": 1.0, + "content": "specifies target poses for PD controller positioned at each joint. 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Figure 12 illus-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "trates accuracy of the discriminators over the course of training. Discriminators trained via GAIL", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 106, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "quickly overpowers the policy, and learns to accurately differentiate between samples, even when", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 256, + 505, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 256, + 505, + 268 + ], + "score": 1.0, + "content": "instance noise is applied to the inputs. 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Figure 12 also visualizes the value of", + "type": "text" + }, + { + "bbox": [ + 460, + 290, + 468, + 300 + ], + "score": 0.84, + "content": "\\beta", + "type": "inline_equation" + }, + { + "bbox": [ + 469, + 289, + 505, + 301 + ], + "score": 1.0, + "content": "over the", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 300, + 505, + 313 + ], + "spans": [ + { + "bbox": [ + 105, + 300, + 505, + 313 + ], + "score": 1.0, + "content": "course of training for motion imitation tasks, along with the loss of the KL term in the objective.", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 312, + 415, + 323 + ], + "spans": [ + { + "bbox": [ + 106, + 312, + 401, + 323 + ], + "score": 1.0, + "content": "The dual gradient descent update effectively enforces the VDB constraint", + "type": "text" + }, + { + "bbox": [ + 401, + 312, + 411, + 322 + ], + "score": 0.86, + "content": "I _ { c }", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 312, + 415, + 323 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 9.5 + }, + { + "type": "text", + "bbox": [ + 107, + 328, + 505, + 405 + ], + "lines": [ + { + "bbox": [ + 105, + 327, + 505, + 340 + ], + "spans": [ + { + "bbox": [ + 105, + 327, + 505, + 340 + ], + "score": 1.0, + "content": "Video Imitation: In the video imitation tasks, we use a simplified 2D biped character in order to", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "score": 1.0, + "content": "avoid issues that may arise due to depth ambiguity from monocular videos. 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The goal of the agent is to imitate", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 383, + 505, + 394 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 505, + 394 + ], + "score": 1.0, + "content": "the motion depicted in the video, without access to the original reference motion, and the reference", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 394, + 289, + 407 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 289, + 407 + ], + "score": 1.0, + "content": "motion is used only to evaluate performance.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 16 + }, + { + "type": "title", + "bbox": [ + 107, + 421, + 325, + 434 + ], + "lines": [ + { + "bbox": [ + 106, + 421, + 326, + 435 + ], + "spans": [ + { + "bbox": [ + 106, + 421, + 326, + 435 + ], + "score": 1.0, + "content": "D INVERSE REINFORCEMENT LEARNING", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "title", + "bbox": [ + 108, + 446, + 231, + 457 + ], + "lines": [ + { + "bbox": [ + 106, + 446, + 232, + 458 + ], + "spans": [ + { + "bbox": [ + 106, + 446, + 232, + 458 + ], + "score": 1.0, + "content": "D.1 EXPERIMENTAL SETUP", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 21 + }, + { + "type": "text", + "bbox": [ + 107, + 466, + 505, + 598 + ], + "lines": [ + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "score": 1.0, + "content": "Environments We evaluate on two maze tasks, as illustrated in Figure 13. The C-maze is taken", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "score": 1.0, + "content": "from Fu et al. (2017): in this maze, the agent starts at a random point within a small fixed distance", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 487, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 505, + 501 + ], + "score": 1.0, + "content": "of the mean start position. The agent has a continuous, 2D action space which allows it to accelerate", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 500, + 505, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 131, + 512 + ], + "score": 1.0, + "content": "in the", + "type": "text" + }, + { + "bbox": [ + 132, + 502, + 139, + 510 + ], + "score": 0.72, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 139, + 500, + 151, + 512 + ], + "score": 1.0, + "content": "or", + "type": "text" + }, + { + "bbox": [ + 151, + 502, + 158, + 511 + ], + "score": 0.79, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 500, + 305, + 512 + ], + "score": 1.0, + "content": "directions, and is able to observe its", + "type": "text" + }, + { + "bbox": [ + 305, + 502, + 312, + 510 + ], + "score": 0.78, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 500, + 330, + 512 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 331, + 502, + 338, + 511 + ], + "score": 0.81, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 500, + 505, + 512 + ], + "score": 1.0, + "content": "position, but not its velocity. The ground", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 509, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 169, + 524 + ], + "score": 1.0, + "content": "truth reward is", + "type": "text" + }, + { + "bbox": [ + 169, + 510, + 267, + 523 + ], + "score": 0.92, + "content": "r _ { t } = - d _ { t } - 1 0 ^ { - 3 } \\| a _ { t } \\| ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 509, + 299, + 524 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 300, + 511, + 310, + 522 + ], + "score": 0.87, + "content": "d _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 509, + 471, + 524 + ], + "score": 1.0, + "content": "is the agent’s distance to the goal, and", + "type": "text" + }, + { + "bbox": [ + 471, + 512, + 481, + 522 + ], + "score": 0.85, + "content": "a _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 509, + 505, + 524 + ], + "score": 1.0, + "content": "is its", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 520, + 505, + 536 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 505, + 536 + ], + "score": 1.0, + "content": "action (this action penalty is assumed to be zero in Figure 13). Episodes terminate after 100 steps;", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 533, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 505, + 545 + ], + "score": 1.0, + "content": "for evaluation, we report the undiscounted mean sum of rewards over each episode The S-maze is", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 544, + 505, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 505, + 556 + ], + "score": 1.0, + "content": "larger variant of the same environment with an extra wall between the agent and its goal. To make", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 554, + 506, + 567 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 506, + 567 + ], + "score": 1.0, + "content": "the S-maze easier to solve for the expert, we added further reward shaping to encourage the agent to", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 565, + 505, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 505, + 577 + ], + "score": 1.0, + "content": "pass between the gaps between walls. We also increased the maximum control forces relative to the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 577, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 577, + 505, + 589 + ], + "score": 1.0, + "content": "C-maze to enable more rapid exploration. Environments will be released along with the rest of our", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 587, + 209, + 599 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 209, + 599 + ], + "score": 1.0, + "content": "VAIRL implementations.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 27.5 + }, + { + "type": "text", + "bbox": [ + 107, + 610, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 611, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 106, + 611, + 505, + 623 + ], + "score": 1.0, + "content": "Hyperparameters Policy networks for all methods were two-layer ReLU MLPs with 32 hidden", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 622, + 505, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 505, + 633 + ], + "score": 1.0, + "content": "units per layer. Reward and discriminator networks were similar, but with 32-unit mean and standard", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 632, + 505, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 505, + 646 + ], + "score": 1.0, + "content": "deviation layers inserted before the final layer for VDB methods. To generate expert demonstrations,", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 644, + 505, + 657 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 505, + 657 + ], + "score": 1.0, + "content": "we trained a TRPO (Schulman et al., 2015) agent on the ground truth reward for the training envi-", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "ronment for 200 iterations, and saved 107 trajectories from each of the policies corresponding to the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "score": 1.0, + "content": "five final iterations. 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For", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 302, + 733 + ], + "score": 1.0, + "content": "the C-maze our VAIRL runs used a target KL of", + "type": "text" + }, + { + "bbox": [ + 302, + 721, + 340, + 732 + ], + "score": 0.91, + "content": "I _ { C } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 720, + 505, + 733 + ], + "score": 1.0, + "content": ", while for the more complex S-maze we", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 39 + } + ], + "page_idx": 19, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 293, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 294, + 38 + ], + "score": 1.0, + "content": "Published as a conference paper at ICLR 2019", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 298, + 750, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 298, + 750, + 313, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 15 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "image", + "bbox": [ + 111, + 83, + 501, + 178 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 111, + 83, + 501, + 178 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 111, + 83, + 501, + 178 + ], + "spans": [ + { + "bbox": [ + 111, + 83, + 501, + 178 + ], + "score": 0.957, + "type": "image", + "image_path": "b6c41654bddeb136cfb4678e2198801a461d01e727e3636d2a6f1dc1cd9fd3ca.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 111, + 83, + 501, + 114.66666666666667 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 111, + 114.66666666666667, + 501, + 146.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 111, + 146.33333333333334, + 501, + 178.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 190, + 505, + 234 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 190, + 505, + 202 + ], + "spans": [ + { + "bbox": [ + 106, + 190, + 505, + 202 + ], + "score": 1.0, + "content": "Figure 12: Left: Accuracy of the discriminator trained using different methods for imitating the", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 201, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 106, + 201, + 311, + 213 + ], + "score": 1.0, + "content": "dance skill. 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The C-maze is taken", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 505, + 489 + ], + "score": 1.0, + "content": "from Fu et al. (2017): in this maze, the agent starts at a random point within a small fixed distance", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 487, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 505, + 501 + ], + "score": 1.0, + "content": "of the mean start position. The agent has a continuous, 2D action space which allows it to accelerate", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 500, + 505, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 131, + 512 + ], + "score": 1.0, + "content": "in the", + "type": "text" + }, + { + "bbox": [ + 132, + 502, + 139, + 510 + ], + "score": 0.72, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 139, + 500, + 151, + 512 + ], + "score": 1.0, + "content": "or", + "type": "text" + }, + { + "bbox": [ + 151, + 502, + 158, + 511 + ], + "score": 0.79, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 500, + 305, + 512 + ], + "score": 1.0, + "content": "directions, and is able to observe its", + "type": "text" + }, + { + "bbox": [ + 305, + 502, + 312, + 510 + ], + "score": 0.78, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 500, + 330, + 512 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 331, + 502, + 338, + 511 + ], + "score": 0.81, + "content": "y", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 500, + 505, + 512 + ], + "score": 1.0, + "content": "position, but not its velocity. The ground", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 509, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 169, + 524 + ], + "score": 1.0, + "content": "truth reward is", + "type": "text" + }, + { + "bbox": [ + 169, + 510, + 267, + 523 + ], + "score": 0.92, + "content": "r _ { t } = - d _ { t } - 1 0 ^ { - 3 } \\| a _ { t } \\| ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 509, + 299, + 524 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 300, + 511, + 310, + 522 + ], + "score": 0.87, + "content": "d _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 509, + 471, + 524 + ], + "score": 1.0, + "content": "is the agent’s distance to the goal, and", + "type": "text" + }, + { + "bbox": [ + 471, + 512, + 481, + 522 + ], + "score": 0.85, + "content": "a _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 509, + 505, + 524 + ], + "score": 1.0, + "content": "is its", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 520, + 505, + 536 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 505, + 536 + ], + "score": 1.0, + "content": "action (this action penalty is assumed to be zero in Figure 13). Episodes terminate after 100 steps;", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 533, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 505, + 545 + ], + "score": 1.0, + "content": "for evaluation, we report the undiscounted mean sum of rewards over each episode The S-maze is", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 544, + 505, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 505, + 556 + ], + "score": 1.0, + "content": "larger variant of the same environment with an extra wall between the agent and its goal. To make", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 554, + 506, + 567 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 506, + 567 + ], + "score": 1.0, + "content": "the S-maze easier to solve for the expert, we added further reward shaping to encourage the agent to", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 565, + 505, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 505, + 577 + ], + "score": 1.0, + "content": "pass between the gaps between walls. We also increased the maximum control forces relative to the", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 577, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 577, + 505, + 589 + ], + "score": 1.0, + "content": "C-maze to enable more rapid exploration. Environments will be released along with the rest of our", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 587, + 209, + 599 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 209, + 599 + ], + "score": 1.0, + "content": "VAIRL implementations.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 27.5, + "bbox_fs": [ + 105, + 466, + 506, + 599 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 610, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 611, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 106, + 611, + 505, + 623 + ], + "score": 1.0, + "content": "Hyperparameters Policy networks for all methods were two-layer ReLU MLPs with 32 hidden", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 622, + 505, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 505, + 633 + ], + "score": 1.0, + "content": "units per layer. Reward and discriminator networks were similar, but with 32-unit mean and standard", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 632, + 505, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 505, + 646 + ], + "score": 1.0, + "content": "deviation layers inserted before the final layer for VDB methods. To generate expert demonstrations,", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 644, + 505, + 657 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 505, + 657 + ], + "score": 1.0, + "content": "we trained a TRPO (Schulman et al., 2015) agent on the ground truth reward for the training envi-", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "ronment for 200 iterations, and saved 107 trajectories from each of the policies corresponding to the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "score": 1.0, + "content": "five final iterations. TRPO used a batch size of 10,000, a step size of 0.01, and entropy bonus with", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "a coefficient of 0.1 to increase diversity. After generating demonstrations, we trained the IRL and", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 687, + 506, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 701 + ], + "score": 1.0, + "content": "imitation methods on a training maze for 200 iterations; again, our policy optimizer was TRPO with", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "the same hyperparameters used to generate demonstrations. Between each policy update, we did", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 359, + 722 + ], + "score": 1.0, + "content": "100 discriminator updates using Adam with a learning rate of", + "type": "text" + }, + { + "bbox": [ + 359, + 709, + 398, + 720 + ], + "score": 0.92, + "content": "5 \\times 1 0 ^ { - 5 }", + "type": "inline_equation" + }, + { + "bbox": [ + 399, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "and batch size of 32. For", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 302, + 733 + ], + "score": 1.0, + "content": "the C-maze our VAIRL runs used a target KL of", + "type": "text" + }, + { + "bbox": [ + 302, + 721, + 340, + 732 + ], + "score": 0.91, + "content": "I _ { C } = 0 . 5", + "type": "inline_equation" + }, + { + "bbox": [ + 341, + 720, + 505, + 733 + ], + "score": 1.0, + "content": ", while for the more complex S-maze we", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 249, + 505, + 263 + ], + "spans": [ + { + "bbox": [ + 106, + 249, + 192, + 263 + ], + "score": 1.0, + "content": "use a tighter target of", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 192, + 250, + 236, + 261 + ], + "score": 0.9, + "content": "I _ { C } = 0 . 0 5", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 236, + 249, + 505, + 263 + ], + "score": 1.0, + "content": ". For the test C-maze, we trained new policies against the recovered", + "type": "text", + "cross_page": true + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 261, + 505, + 273 + ], + "spans": [ + { + "bbox": [ + 105, + 261, + 505, + 273 + ], + "score": 1.0, + "content": "reward using TRPO with the hyperparameters described above; for the test S-maze, we modified", + "type": "text", + "cross_page": true + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 271, + 471, + 285 + ], + "spans": [ + { + "bbox": [ + 106, + 271, + 471, + 285 + ], + "score": 1.0, + "content": "these parameters to use a batch size of 50,000 and learning rate of 0.001 for 400 iterations.", + "type": "text", + "cross_page": true + } + ], + "index": 9 + } + ], + "index": 39, + "bbox_fs": [ + 105, + 611, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 173, + 85, + 443, + 164 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 173, + 85, + 443, + 164 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 173, + 85, + 443, + 164 + ], + "spans": [ + { + "bbox": [ + 173, + 85, + 443, + 164 + ], + "score": 0.963, + "type": "image", + "image_path": "12bc128902971697948715d483d597b425c86c8befea48689d912e331c19ad9a.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 173, + 85, + 443, + 111.33333333333333 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 173, + 111.33333333333333, + 443, + 137.66666666666666 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 173, + 137.66666666666666, + 443, + 164.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 179, + 506, + 223 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 179, + 505, + 191 + ], + "spans": [ + { + "bbox": [ + 105, + 179, + 505, + 191 + ], + "score": 1.0, + "content": "Figure 13: Left: The C-maze used for training and its mirror version used for testing. Colour", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 190, + 504, + 201 + ], + "spans": [ + { + "bbox": [ + 106, + 190, + 504, + 201 + ], + "score": 1.0, + "content": "contours show the ground truth reward function that we use to train the expert and evaluate transfer", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 201, + 506, + 214 + ], + "spans": [ + { + "bbox": [ + 105, + 201, + 506, + 214 + ], + "score": 1.0, + "content": "quality, while the red and green dots show the initial and goal positions, respectively. Right: The", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 213, + 249, + 225 + ], + "spans": [ + { + "bbox": [ + 106, + 213, + 249, + 225 + ], + "score": 1.0, + "content": "analogous diagram for the S-maze.", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 4.5 + } + ], + "index": 2.75 + }, + { + "type": "text", + "bbox": [ + 108, + 250, + 504, + 283 + ], + "lines": [ + { + "bbox": [ + 106, + 249, + 505, + 263 + ], + "spans": [ + { + "bbox": [ + 106, + 249, + 192, + 263 + ], + "score": 1.0, + "content": "use a tighter target of", + "type": "text" + }, + { + "bbox": [ + 192, + 250, + 236, + 261 + ], + "score": 0.9, + "content": "I _ { C } = 0 . 0 5", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 249, + 505, + 263 + ], + "score": 1.0, + "content": ". For the test C-maze, we trained new policies against the recovered", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 261, + 505, + 273 + ], + "spans": [ + { + "bbox": [ + 105, + 261, + 505, + 273 + ], + "score": 1.0, + "content": "reward using TRPO with the hyperparameters described above; for the test S-maze, we modified", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 271, + 471, + 285 + ], + "spans": [ + { + "bbox": [ + 106, + 271, + 471, + 285 + ], + "score": 1.0, + "content": "these parameters to use a batch size of 50,000 and learning rate of 0.001 for 400 iterations.", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 8 + }, + { + "type": "title", + "bbox": [ + 109, + 302, + 277, + 313 + ], + "lines": [ + { + "bbox": [ + 106, + 302, + 279, + 315 + ], + "spans": [ + { + "bbox": [ + 106, + 302, + 279, + 315 + ], + "score": 1.0, + "content": "D.2 RECOVERED REWARD FUNCTIONS", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 107, + 324, + 505, + 402 + ], + "lines": [ + { + "bbox": [ + 106, + 325, + 505, + 336 + ], + "spans": [ + { + "bbox": [ + 106, + 325, + 505, + 336 + ], + "score": 1.0, + "content": "Figure 14 and 15 show the reward functions recovered by each IRL baseline on the C-maze and", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 336, + 505, + 348 + ], + "spans": [ + { + "bbox": [ + 105, + 336, + 505, + 348 + ], + "score": 1.0, + "content": "S-maze, respectively, along with sample trajectories for policies trained to optimize those rewards.", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 346, + 505, + 359 + ], + "spans": [ + { + "bbox": [ + 105, + 346, + 505, + 359 + ], + "score": 1.0, + "content": "Notice that VAIRL tends to recover smoother reward functions that match the ground truth reward", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 358, + 505, + 370 + ], + "spans": [ + { + "bbox": [ + 105, + 358, + 505, + 370 + ], + "score": 1.0, + "content": "more closely than the baselines. Addition of a gradient penalty enhances this effect for both AIRL", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 369, + 505, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 369, + 505, + 381 + ], + "score": 1.0, + "content": "and VAIRL. This is especially true in S-maze, where combining a gradient penalty with a variational", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 380, + 505, + 392 + ], + "spans": [ + { + "bbox": [ + 105, + 380, + 505, + 392 + ], + "score": 1.0, + "content": "discriminator bottleneck leads to a smooth reward that gradually increases as the agent nears its goal", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 390, + 232, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 390, + 232, + 404 + ], + "score": 1.0, + "content": "position at the top of the maze.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 14 + }, + { + "type": "title", + "bbox": [ + 108, + 423, + 234, + 436 + ], + "lines": [ + { + "bbox": [ + 105, + 423, + 235, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 423, + 235, + 438 + ], + "score": 1.0, + "content": "E IMAGE GENERATION", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 106, + 451, + 465, + 463 + ], + "lines": [ + { + "bbox": [ + 105, + 449, + 468, + 466 + ], + "spans": [ + { + "bbox": [ + 105, + 449, + 468, + 466 + ], + "score": 1.0, + "content": "We provide further experiment on image generation and details of the experimental setup.", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 19 + }, + { + "type": "title", + "bbox": [ + 108, + 482, + 234, + 493 + ], + "lines": [ + { + "bbox": [ + 106, + 482, + 235, + 493 + ], + "spans": [ + { + "bbox": [ + 106, + 482, + 235, + 493 + ], + "score": 1.0, + "content": "E.1 EXPERIMENTAL SETUP:", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 107, + 504, + 504, + 559 + ], + "lines": [ + { + "bbox": [ + 106, + 505, + 505, + 516 + ], + "spans": [ + { + "bbox": [ + 106, + 505, + 505, + 516 + ], + "score": 1.0, + "content": "We use the non-saturating objective of Goodfellow et al. (2014) for all models except WGAN-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 514, + 505, + 527 + ], + "spans": [ + { + "bbox": [ + 105, + 514, + 412, + 527 + ], + "score": 1.0, + "content": "GP. Following (Lucic et al., 2017), we compute FID on samples of size", + "type": "text" + }, + { + "bbox": [ + 412, + 515, + 442, + 526 + ], + "score": 0.87, + "content": "1 0 0 0 0 ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 514, + 505, + 527 + ], + "score": 1.0, + "content": ". We base our", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 526, + 505, + 538 + ], + "spans": [ + { + "bbox": [ + 106, + 526, + 505, + 538 + ], + "score": 1.0, + "content": "implementation on (Mescheder et al., 2018), where we do not use any batch normalization for both", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 537, + 506, + 550 + ], + "spans": [ + { + "bbox": [ + 105, + 537, + 506, + 550 + ], + "score": 1.0, + "content": "the generator and the discriminator. We use RMSprop (Hinton et al.) and a fixed learning rate for", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 547, + 173, + 562 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 173, + 562 + ], + "score": 1.0, + "content": "all experiments.", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23 + }, + { + "type": "text", + "bbox": [ + 107, + 565, + 505, + 653 + ], + "lines": [ + { + "bbox": [ + 106, + 566, + 504, + 577 + ], + "spans": [ + { + "bbox": [ + 106, + 566, + 504, + 577 + ], + "score": 1.0, + "content": "For convolutional GAN, variational discriminative bottleneck is implemented as a 1x1 convolution", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 576, + 506, + 588 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 389, + 588 + ], + "score": 1.0, + "content": "on the final embedding space that outputs a Gaussian distribution over", + "type": "text" + }, + { + "bbox": [ + 389, + 577, + 398, + 586 + ], + "score": 0.73, + "content": "Z", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 576, + 506, + 588 + ], + "score": 1.0, + "content": "parametrized with a mean", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 587, + 506, + 600 + ], + "spans": [ + { + "bbox": [ + 105, + 587, + 506, + 600 + ], + "score": 1.0, + "content": "and a diagonal covariance matrix. 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Colour", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 190, + 504, + 201 + ], + "spans": [ + { + "bbox": [ + 106, + 190, + 504, + 201 + ], + "score": 1.0, + "content": "contours show the ground truth reward function that we use to train the expert and evaluate transfer", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 201, + 506, + 214 + ], + "spans": [ + { + "bbox": [ + 105, + 201, + 506, + 214 + ], + "score": 1.0, + "content": "quality, while the red and green dots show the initial and goal positions, respectively. 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MethodBackflipCartwheelDanceRunSpinkick
BC3.012.882.932.632.88
Merel et al., 20171.33 ± 0.031.47 ± 0.122.61 ± 0.300.52 ± 0.041.82 ± 0.35
GAIL0.74±0.150.84± 0.051.31 ± 0.160.17±0.031.07 ± 0.03
GAIL -noise0.42±0.020.92±0.070.96±0.080.21±0.050.95±0.14
GAIL - noise z0.67±0.120.72± 0.041.14 ± 0.080.14±0.030.64±0.09
GAIL - GP0.62±0.090.69 ±0.050.80± 0.320.12 ± 0.020.64± 0.04
VAIL (ours)0.36±0.130.40±0.080.40±0.210.13±0.010.34± 0.05
VAIL - GP (ours)0.46±0.170.31 ± 0.020.15±0.010.10±0.010.31 ± 0.02
Peng et al., 20180.260.210.200.140.19
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MethodTransferenvironments
C-mazeS-maze
GAIL-24.6±7.21.0±1.3
VAIL-65.6±18.920.8±39.7
AIRL-15.3±7.8-0.2±0.1
AIRL - GP-9.14±0.4-0.14±0.3
VAIRL (β = 0)-25.5±7.262.3±33.2
VAIRL (ours)-10.0±2.274.0±38.7
VAIRL - GP (ours)-9.18±0.4156.5±5.6
TRPO expert-5.1153.2
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However, standard VAE training is not possible in this case, which has motivated different strategies to manipulate discrete distributions in order to train discrete VAEs similarly to conventional ones. Here we ask if it is also possible to keep the discrete nature of the latents fully intact by applying a direct discrete optimization for the encoding model. The studied approach is consequently strongly diverting from standard VAE training by altogether sidestepping absolute standard VAE mechanisms such as sampling approximation, reparameterization trick and amortization. Discrete optimization is realized in a variational setting using truncated posteriors in conjunction with evolutionary algorithms (using a recently suggested approach). For VAEs with binary latents, we first show how such a discrete variational method (A) ties into gradient ascent for network weights and (B) uses the decoder network to select latent states for training. More conventional amortized training is, as may be expected, more efficient than direct discrete optimization, and applicable to large neural networks. However, we here find direct optimization to be efficiently scalable to hundreds of latent variables using smaller networks. More importantly, we find the effectiveness of direct optimization to be highly competitive in ‘zero-shot’ learning (where high effectiveness for small networks is required). In contrast to large supervised neural networks, the here investigated VAEs can, e.g., denoise a single image without previous training on clean data and/or training on large image datasets. More generally, the studied approach shows that training of VAEs is indeed possible without sampling-based approximation and reparameterization, which may be interesting for the analysis of VAE-training in general. In the regime of few data, direct optimization, furthermore, makes VAEs competitive for denoising where they have previously been outperformed by non-generative approaches. + +# 1 INTRODUCTION AND RELATED WORK + +Variational autoencoders (Kingma & Welling, 2014; Rezende et al., 2014) are prominent and very actively researched models for unsupervised learning. VAEs, in their many different variations, have successfully been applied to a large number of tasks including semi-supervised learning (e.g. Maaløe et al., 2016), anomaly detection (e.g. An & Cho, 2015; Kiran et al., 2018), sentence interpolation (Bowman et al., 2016), music interpolation (Roberts et al., 2018) and drug response prediction (Rampasek et al., 2017). The success of VAEs rests on a series of methods that enable the derivation of scalable training algorithms to optimize their model parameters (discussed further below). A desired feature when applying VAEs to a given problem is that their latent variables (i.e., the encoder output variables) correspond to meaningful properties of the data, ideally to those latent causes that have originally generated the data. However, many real-world datasets suggest the use of discrete latents as they often describe the data generation process more naturally. For instance, the presence or absence of objects in images is best described by binary latents (e.g. Jojic & Frey, 2001). Discrete latents are also a popular choice in modeling sounds; for instance, describing piano sounds may naturally involve binary latents: keys are pressed or not (e.g. Titsias & Lazaro-Gredilla, ´ 2011; Goodfellow et al., 2013; Sheikh et al., 2014). The success of standard forms of VAEs has + +consequently spurred research on novel formulations that feature discrete latents (e.g. Rolfe, 2016; +Khoshaman & Amin, 2018; Roy et al., 2018; Sadeghi et al., 2019; Vahdat et al., 2019). + +The objective of VAE training is the optimization of a generative data model which parameterizes a given data distribution. Typically we seek model parameters $\Theta$ of a VAE that maximize the data log-likelihood, $\begin{array} { r } { \mathrm { L } ( \Theta ) = \sum _ { n } \log \left( p _ { \Theta } ( \vec { x } ^ { ( n ) } ) \right) } \end{array}$ , where we denote by $\vec { x } ^ { ( 1 : N ) }$ a set of $N$ observed data points, and where $p _ { \Theta } ( \vec { x } )$ denotes the modeled data distribution. Like conventional autoencoders (e.g., Bengio et al., 2007), VAEs use a deep neural network (DNN) to generate (or decode) observables $\vec { x }$ from a latent code $\vec { z }$ . Unlike conventional autoencoders, however, the generation of data $\vec { x }$ is not deterministic but it takes the form of a probabilistic generative model. + +For VAEs with binary latent variables, as they will be of interest here, we consider the following VAE generative model: + +$$ +\begin{array} { r } { p _ { \Theta } ( \vec { z } ) = \mathrm { B e r n } ( \vec { z } ; \vec { \pi } ) = \prod _ { h } \big ( \pi _ { h } ^ { z _ { h } } ( 1 - \pi _ { h } ) ^ { ( 1 - z _ { h } ) } \big ) , \qquad p _ { \Theta } ( \vec { x } \mid \vec { z } ) = \mathcal { N } \big ( \vec { x } ; \vec { \mu } ( \vec { z } ; W ) , \sigma ^ { 2 } \mathbb { I } \big ) , } \end{array} +$$ + +where $\vec { z } \in \{ 0 , 1 \} ^ { H }$ is a binary code and the non-linear function $\vec { \mu } ( \vec { z } ; W )$ is a DNN that outputs the mean of the Gaussian distribution. $p _ { \Theta } ( \vec { x } \vert \vec { z } )$ is commonly referred to as decoder. The set of model parameters is $\Theta = \{ \vec { \pi } , W , \sigma ^ { 2 } \}$ , where $W$ incorporates DNN weights and biases. We assume homoscedasticity of the Gaussian distribution, but note that there is no obstacle to generalizing the model by inserting a DNN non-linearity that outputs a correlation matrix. Similarly, the algorithm could easily be generalized to different noise distributions should the task at hand call for it. For the purpose of this work, however, we will focus on as elementary as possible VAEs, with the form shown in Eqn. (1). + +Given standard or binary-latent VAEs, essentially all learning algorithms seek to approximately maximize the log-likelihood using the following series of methods (we elaborate in the appendix): + +(A) Instead of the log-likelihood, a variational lower-bound (a.k.a. ELBO) is optimized. +(B) VAE posteriors are approximated by an encoding model, that is a specific distribution (often Gaussian) parameterized by one or more DNNs. +(C) The variational parameters of the encoder are optimized using gradient ascent on the lower bound, where the gradient is evaluated based on sampling and reparameterization trick to obtain sufficiently low-variance and yet efficiently computable estimates. +(D) Using samples from the encoder, the parameters of the decoder are optimized using gradient ascent on the variational lower bound. + +Optimization procedures for VAEs with discrete latents follow the same steps (Points A to D). However, discrete or binary latents pose substantial further obstacles in learning, mainly due to the fact that backpropagation through discrete variables is generally not possible (Rolfe, 2016; Bengio et al., 2013). In order to maintain the general VAE framework for encoder optimization, different groups have therefore suggested different possible solutions: work by Rolfe (2016), for instance, extends VAEs with discrete latents by auxiliary continuous latents such that gradients can still be computed. Work on the concrete distribution (Maddison et al., 2016) or Gumbel-softmax distribution (Jang et al., 2016) proposes newly defined continuous distributions that contain discrete distributions as limit cases. Work by Lorberbom et al. (2019) merges the Gumbel-Max reparameterization with the use of direct loss minimization for gradient estimation, enabling efficient training on structured latent spaces. Finally, work by van den Oord et al. (2017), and Roy et al. (2018) combines VAEs with a vector quantization (VQ) stage in the latent layer. Latents become discrete through quantization but gradients for learning are adapted from latent values before they are processed by the VQ stage. All methods have the goal of treating discrete distributions such that standard VAE training as developed for continuous latents can still be applied. These techniques interact during training with the standard methods (Points A-D) already in place for VAE optimization. Furthermore, they add further types of design decisions and hyper-parameters, for example parameters for annealing from softened discrete distributions to the (hard) original distributions for discrete latents. + +For discrete VAEs, it may consequently be a desirable goal to investigate alternative, more direct optimization procedures that do not require a softening of discrete distributions or the use of other indirect solutions. Such a direct approach is challenging, however, because once DNNs are used to define the encoding model (Point B) standard tricks to estimate gradients (Point C) seem unavoidable. A direct optimization procedure, as is investigated here, consequently has to substantially change VAE training. For the data model (1) we will maintain the variational setting and a decoding model with DNNs as non-linearity (Points A and D). However, we will not use an encoder model parameterized by DNNs (Point B). Instead, the variational bound will be increased w.r.t. the encoder model by using a discrete optimization approach. The procedure does not require gradients to be computed for the encoder such that discrete latents are addressed without the use of reparameterization trick and sampling approximations. + +# 2 TRUNCATED VARIATIONAL OPTIMIZATION + +Let us consider the variational lower bound of the likelihood. If we denote by $q _ { \Phi } ^ { ( n ) } ( { \vec { z } } )$ the variational distributions with parameters $\boldsymbol { \Phi } ^ { ( n ) }$ , and by $\begin{array} { r } { \left. h ( \vec { z } ) \right. _ { q _ { \Phi } ^ { ( n ) } } = \sum _ { \vec { z } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) h ( \vec { z } ) } \end{array}$ expectation values w.r.t. to $q _ { \Phi } ^ { ( n ) } ( { \vec { z } } )$ , then the lower bound can be written as: + +$$ +\begin{array} { r } { \mathcal { F } ( \Phi , \Theta ) = \sum _ { n } \big \langle \log \big ( p _ { \Theta } ( \vec { x } ^ { ( n ) } \vert \vec { z } ) p _ { \Theta } ( \vec { z } ) \big ) \big \rangle _ { q _ { \Phi } ^ { ( n ) } } - \sum _ { n } \big \langle \log \big ( q _ { \Phi } ^ { ( n ) } ( \vec { z } ) \big ) \big \rangle _ { q _ { \Phi } ^ { ( n ) } } , } \end{array} +$$ + +The general challenge for the maximization of $\mathcal { F } ( \Phi , \Theta )$ is the optimization of the encoding model $q _ { \Phi } ^ { ( n ) }$ . VAEs with discrete latents add to this challenge the problem of taking gradients w.r.t. discrete latents. If we seek to avoid derivatives w.r.t. discrete variables, we have to define an alternative encoding model $q _ { \Phi } ^ { ( n ) }$ but such an encoding has to remain sufficiently efficient. Considering prior work on generative models with discrete latents, variational distributions based on truncated posteriors offer themselves as such an alternative (Lucke & Sahani, 2008). Truncated posterior approxima- ¨ tions have been shown to be functionally competitive (e.g. Sheikh et al., 2014; Hughes & Sudderth, 2016; Shelton et al., 2017), and they are able to efficiently train also very large scale models with hundreds or thousands of latents (e.g. Shelton et al., 2011; Sheikh & Lucke, 2016; Forster & L ¨ ucke, ¨ 2018). However, the important question for training discrete VAEs is if or how truncated variational distributions can be used in gradient-based optimization of neural network parameters. We here, for the first time, address this question noting that all previous approaches relied on closed-form (or pseudo-closed form) parameter update equations in an expectation-maximization learning paradigm. + +Optimization of the Decoding Model. In order to optimize the parameters $W$ of the decoder DNN $\vec { \mu } ( \vec { z } , W )$ , the gradient of the variational bound (2) w.r.t. $W$ has to be computed. We consequently need, for any VAE, a sufficiently precise and efficient approximation of the expectation value w.r.t. the encoder $q _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . Gradient estimation is of central importance for deep unsupervised learning, and approaches, e.g., for variance reduction of estimators have played an important role and are dedicated solely to this purpose (e.g., Williams, 1992). Reparameterization finally emerged as a key method because it allowed for sufficiently low-variance estimation of gradients based, e.g., on Gaussian middle-layer units (Kingma & Welling, 2014; Rezende et al., 2014). + +For discrete VAEs, however, reparameterization requires the introduction of additional manipulations of discrete distributions that we here seek to fully avoid. + +Instead of using reparameterization or variance reduction, we will compute gradients based on truncated posterior as variational distributions. A truncated posterior has the following form: + +$$ +\begin{array} { r l } { q _ { \Phi } ^ { ( n ) } ( \vec { z } ) : = } & { \frac { p _ { \Theta } ( \vec { z } | \vec { x } ^ { ( n ) } ) } { \sum _ { \vec { z } ^ { \prime } \in \Phi ^ { ( n ) } } p _ { \Theta } \left( \vec { z } ^ { \prime } | \vec { x } ^ { ( n ) } \right) } = \frac { p _ { \Theta } ( \vec { x } ^ { ( n ) } | \vec { z } ) p _ { \Theta } ( \vec { z } ) } { \sum _ { \vec { z } ^ { \prime } \in \Phi ^ { ( n ) } } p _ { \Theta } ( \vec { x } ^ { ( n ) } | \vec { z } ^ { \prime } ) p _ { \Theta } \left( \vec { z } ^ { \prime } \right) } \mathrm { i f } \vec { z } \in \Phi ^ { ( n ) } , } \end{array} +$$ + +where for all $\vec { z } \not \in \boldsymbol { \Phi } ^ { ( n ) }$ the probability $q _ { \Phi } ^ { ( n ) } ( \vec { z } )$ equals zero. That is, a variational distribution q(n)Φ (\~z) is proportional to the true posteriors in a subset $\boldsymbol { \Phi } ^ { ( n ) }$ , which acts as its variational parameter. + +We can now compute the gradient of (2) w.r.t. the decoder weights $W$ which results in: + +$$ +\vec { \nabla } _ { W } \mathcal { F } ( \Phi , \Theta ) = - \frac { 1 } { 2 \sigma ^ { 2 } } \sum _ { n } \sum _ { \vec { z } \in \Phi ^ { ( n ) } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) ~ \vec { \nabla } _ { W } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } . +$$ + +The right-hand-side has salient similarities to the standard gradient ascent for VAE decoders. Especially the familiar gradient of the mean squared error (MSE) shows that, e.g., standard automatic differentiation tools can be applied. However, the decisive difference are the weighting factors $q _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . Considering (3), in order to compute the weighting factors we require all $\vec { z } \in \boldsymbol { \Phi } ^ { ( n ) }$ to be passed through the decoder DNN. As all states of Φ(n) anyway have to be passed through the decoder for the MSE term of (4), the overall computational complexity is not higher than an estimation of the gradient with samples instead of states in $\boldsymbol { \Phi } ^ { ( n ) }$ (we elaborate in Appendix A). + +To complete the decoder optimization, update equations for variance $\sigma ^ { 2 }$ and prior parameters $\vec { \pi }$ can be computed in closed-form (compare, e.g., Shelton et al., 2011) and are given by: + +$$ +\begin{array} { r } { \sigma ^ { 2 , \mathrm { n e w } } = \frac { 1 } { D N } \displaystyle \sum _ { n } \displaystyle \sum _ { \vec { z } \in \Phi ^ { ( n ) } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } , \qquad \vec { \pi } ^ { \mathrm { n e w } } = \frac { 1 } { N } \displaystyle \sum _ { n } \displaystyle \sum _ { \vec { z } \in \Phi ^ { ( n ) } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) \vec { z } , } \end{array} +$$ + +where $N$ is the number of samples in the training dataset and $D$ is the number of observables. + +Optimization of the Encoding Model. After having established that the decoder can be optimized efficiently and by using standard DNN methods, the important question is if the encoder can be trained efficiently. Encoder optimization is usually based on a reformulation of the variational bound (2) given by: + +$$ +\begin{array} { r } { \mathcal { F } ( \Phi , \Theta ) = \sum _ { n } \big \langle \log \big ( p _ { \Theta } ( \vec { x } ^ { ( n ) } \mid \vec { z } ) \big ) \big \rangle _ { q _ { \Phi } ^ { ( n ) } } - \sum _ { n } D _ { \mathrm { K L } } \big ( q _ { \Phi } ^ { ( n ) } ( \vec { z } ) , p _ { \Theta } ( \vec { z } ) \big ) . } \end{array} +$$ + +Centrally for this work, truncated posteriors allow a specific alternative reformulation of the bound that enables efficient optimization. The reformulation recombines the entropy term of the original form (2) with the first expectation value into a single term, and is given by (see Lucke, 2019, for ¨ details): + +$$ +\mathcal { F } ( \Phi , \Theta ) = \sum _ { n } \log \big ( \sum _ { \vec { z } \in \Phi ^ { ( n ) } } p _ { \Theta } ( \vec { x } ^ { ( n ) } | \vec { z } ) p _ { \Theta } ( \vec { z } ) \big ) . +$$ + +Thanks to the simplified form of the bound, the variational parameters $\boldsymbol { \Phi } ^ { ( n ) }$ of the encoding model can now be sought using direct discrete optimization procedures. More concretely, because of the specific form (7), pairwise comparisons of joint probabilities are sufficient to maximize the lower bound: if we update the set $\Phi ^ { ( { \bar { n } } ) }$ for a given $\vec { x } ^ { ( n ) }$ by replacing a state $\vec { z } ^ { \mathrm { o l d } } \in \boldsymbol { \Phi } ^ { ( n ) }$ with a state $\vec { z } ^ { \mathrm { n e w } } \not \in \boldsymbol { \Phi } ^ { ( n ) }$ , then $\mathcal { F } ( \Phi , \Theta )$ increases if and only if: + +$$ +\log \left( p _ { \Theta } ( \vec { x } ^ { ( n ) } , \vec { z } ^ { \mathrm { n e w } } ) \right) > \log \left( p _ { \Theta } ( \vec { x } ^ { ( n ) } , \vec { z } ^ { \mathrm { o l d } } ) \right) . +$$ + +To obtain intuition for the pairwise comparison, consider its form when inserting the binary VAE (1) into the left- and right-hand sides. Eliding terms that do not depend on $\vec { z }$ we obtain: + +$$ +\begin{array} { r } { \widetilde { \log p } _ { \Theta } ( \vec { x } , \vec { z } ) = - \| \vec { x } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } - 2 \sigma ^ { 2 } \sum _ { h } \widetilde { \pi } _ { h } z _ { h } } \end{array} +$$ + +where $\tilde { \pi } _ { h } = \log \left( ( 1 - \pi _ { h } ) / \pi _ { h } \right)$ . The expression assumes an even more familiar form if we restrict ourselves for a moment to sparse priors $\pi < { \frac { 1 } { 2 } }$ , i.e., $\tilde { \pi } > 0$ . Criterion (8) then becomes: + +$$ +\begin{array} { r } { \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } ^ { \mathrm { n e w } } , W ) \| ^ { 2 } + 2 \sigma ^ { 2 } \tilde { \pi } | \vec { z } ^ { \mathrm { n e w } } | ~ < ~ \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } ^ { \mathrm { o l d } } , W ) \| ^ { 2 } + 2 \sigma ^ { 2 } \tilde { \pi } | \vec { z } ^ { \mathrm { o l d } } | } \end{array} +$$ + +where $\begin{array} { r } { | \vec { z } | = \sum _ { h = 1 } ^ { H } z _ { h } } \end{array}$ . Such functions are routinely encountered in sparse coding or compressive sensing (Eldar & Kutyniok, 2012): for each set $\boldsymbol { \Phi } ^ { ( n ) }$ we seek those states $\vec { z }$ that are reconstructing $\vec { x } ^ { ( n ) }$ well while being sparse $\vec { z }$ with few non-zero bits). For VAEs, $\vec { \mu } ( \vec { z } ^ { \mathrm { n e w } } , W )$ is a DNN and as such much more flexible in matching the distribution of observables $\vec { x }$ than can be expected from linear mappings. Furthermore, criteria like (10) usually emerge for maximum a-posteriori (MAP) training in sparse coding (Olshausen & Field, 1996). In contrast, we here seek a population of states $\vec { z }$ in $\Phi ^ { ( n ) }$ for each data point. It is a consequence of the reformulated lower bound (7) that it remains optimal to evaluate joint probabilities (as for MAP) although the constructed population of states $\boldsymbol { \Phi } ^ { ( n ) }$ can capture (unlike MAP training) a rich posterior structure. + +But how can new states ${ \vec { z } } ^ { \mathrm { n e w } }$ that optimize $\boldsymbol { \Phi } ^ { ( n ) }$ be found efficiently in high-dimensional latent spaces? Random search and search by sampling has recently been explored for elementary generative models (Lucke et al., 2018). Here we will follow another recent suggestion (Guiraud et al., ¨ 2018) and make use of a search based on evolutionary algorithms (EAs). In this setting we interpret sets $\boldsymbol { \Phi } ^ { ( n ) }$ as populations of binary genomes $\vec { z }$ and base the fitness function on Eqn. (9). + +Concretely, using $\boldsymbol { \Phi } ^ { ( n ) }$ as initial parent pool, we apply the following genetic operators in sequence: firstly, parent selection picks $N _ { p }$ states from the parent pool. In our numerical experiments we used + +A.Parent selectionB.MutationC.New population + +![](images/9ac5796e15c2abf03775e735e88196f8ed4ac0a48e8267479695a7378d10fa67.jpg) +Figure 1: The optimization process of the variational parameters $\Phi ^ { ( n ) }$ using evolutionary search. A. Some states are selected as parents. B. Each child undergoes mutation. C. Children are merged with the original population and the least fit are discarded. + +fitness-proportional parent selection, for which we add an offset (constant w.r.t. $\vec { z }$ ) to the fitness values in order to make them strictly non-negative. Each of the children undergoes mutation: one or more bits are flipped to further increase offspring diversity. In our experiments we perform random uniform selection of the bits to flip. Crossover could also be employed to increase offspring diversity. We repeat the procedure using the children generated this way as the parent pool, giving birth to multiple generations of candidate states. Finally, we update $\boldsymbol { \Phi } ^ { ( n ) }$ by substituting individuals with low fitness with candidates with higher fitness. The whole procedure can be seen as an evolutionary algorithm with perfect memory or very strong elitism (individuals with higher fitness never drop out of the gene pool). Note that the improvement of the variational lower bound depends on generating as many as possible different children with high fitness over the course of training. + +We point out that the EAs optimize each $\boldsymbol { \Phi } ^ { ( n ) }$ independently, so this technique can be applied to large datasets in conjunction with stochastic or batch gradient descent on the model parameters $\Theta$ : it does not require to keep the full dataset (or all sets $\boldsymbol { \Phi } ^ { ( n ) }$ ) in memory at a given time. Fig 1 shows how EAs produce new states that are used to update each set $\boldsymbol { \Phi } ^ { ( n ) }$ . The full training procedure for binary VAEs is summarized in Algorithm 1. + +# Algorithm 1 Training Truncated Variational Autoencoders + +Initialize model parameters $\Theta = \{ W , \vec { \pi } , \sigma ^ { 2 } \}$ +Initialize each Φ(n) with $S$ distinct latent states +repeat for all batches in dataset do for sample $_ n$ in batch do $\Phi ^ { n e w } = \Phi ^ { ^ { ( n ) } }$ for all generations do Φnew mutation (crossover (selection $( \Phi ^ { n e w } ) )$ ) $\boldsymbol { \Phi } ^ { ( n ) } = \boldsymbol { \Phi } ^ { ( n ) } \cup \boldsymbol { \Phi } ^ { n e w }$ end for Truncate $\boldsymbol { \Phi } ^ { ( n ) }$ to $S$ fittest elements based on (9) end for Use Adam to update $W$ using objective (4) end for Use (5) to update $\vec { \pi }$ , $\sigma ^ { 2 }$ +until parameters $\Theta$ have sufficiently converged + +![](images/2bc6269339c0e4affc63a21c98617219d8cf4f53bbc0d2971dd59f7f4f440ed2.jpg) +Figure 2: Graphical representation of the model architecture used in numerical experiments. + +# 3 NUMERICAL EXPERIMENTS + +Having defined the training procedure, we numerically investigated its properties. After first verifying that the procedure can recover generating parameters using ground-truth data (see Appendix B), we conducted experiments to address the following two standard questions: + +(1) How efficient, i.e. how scalable, is the direct discrete optimization of binary VAEs? (2) How effective is the procedure, i.e., how well does it perform for a given VAE model? + +In all numerical experiments, the training of the DNN parameters based on (4) is performed with mini-batches, the Adam optimizer (Kingma & Ba, 2014) and decaying or cyclical learning rate scheduling (Smith, 2017). Xavier/Glorot initialization (Glorot $\&$ Bengio, 2010) is used for the DNN weights, while biases are always zero-initialized. Parameters $\vec { \pi }$ and $\sigma ^ { 2 }$ are updated via Eqn. (5) and initialized to $\textstyle { \frac { 1 } { H } }$ $H$ is the size of $\vec { \pi }$ ) and 0.01 respectively. Hyper-parameter optimization was conducted manually and, for the more complex datasets, it also made use of black box Bayesian optimization based on Gaussian Processes (Nogueira, 2019). We will refer to the binary VAE trained with the method described above as Truncated Variational Autoencoder (TVAE) as the use of truncated posteriors is the main distinguishing feature. + +
g=15g=25g=50
MTMKL34.2931.8828.08
GSC32.6831.1028.02
VAR-BSC32.2531.1528.62
TVAE34.27 ± .0232.65 ± .0629.61± .02
+ +Scalability and improvement on linear models. Let us first numerically investigate scalability properties of TVAE especially in comparison with linear models. After verifying parameter recovery for ground-truth data (see Appendix B), we used natural data in the form of image patches as an intermediately large scale and natural dataset. Concretely, we used 100,000 whitened image patches of $1 6 \times 1 6$ pixels extracted from a standard image database (van Hateren & van der Schaaf, 1998) and pre-processed as in Guiraud et al. (2018). + +![](images/a89cb8777ccb03c1af036831a57ce347819b931b4fcc37a3ff12df3f99e95270.jpg) +Table 1: Denoising performance in PSNR (dB) for the ‘house’ image under controlled conditions $\scriptstyle { \mathcal { D } } = 8 \times 8$ , $H { = } 6 4$ for all algorithms). + +The simplest possible VAEs would use linear mappings for the decoder $\vec { \mu } ( \vec { z } , W )$ . For standard Gaussian latents, a linear VAE can recover probabilistic PCA solutions (e.g. Lucas et al., 2019). For Bernoulli latents, we would recover binary sparse coding (Haft et al., 2004; Shelton et al., 2011) solutions. We therefore start training (using $H = 3 0 0$ latents) with a linear VAE. After 100 epochs the weights of the linear mapping were used to initialize the bottom layer of a deeper decoder network with three layers of 300, 300 and $1 6 \times 1 6 = 2 5 6$ units. The weights of the deeper layers were simply initialized to the identity matrix. Furthermore, prior and variance were optimized. The described setup guarantees a common starting point for linear and non-linear VAEs such that the difference provided by deeper decoder DNNs can be highlighted. Fig. 3 shows the variational bounds during learning of the linear VAE compared to the non-linear VAE for a typical experiment. The non-linear VAE can be observed to quickly and significantly optimize the lower bound beyond a linear VAE. We will later (when we are not interested in comparisons to linear VAEs) simply optimize the weights of non-linear TVAE directly as we did not observed an advantage by first optimizing a linear VAE. + +![](images/be5972d41617605cdac7f1e82da43139d1803097042d0f2204b119824795367a.jpg) +Figure 3: ELBO gain of TVAE compared to linear VAE with binary latents (on $1 6 \times 1 6$ image patches). +Figure 4: TVAE denoising of house image with noise level $\sigma ~ = ~ 5 0$ . The denoised image has $\mathrm { P S N R } { = } 3 0 . 0 3$ , the best of the runs of Tab. 2. + +Compared to shallow linear models, we observed a similar efficiency and scalability of TVAE. The main additional computational costs are given by passing the latent states through the a full decoder DNN instead of just through a linear mapping. The sets of states used could be kept small, at size $S = | \boldsymbol \Phi ^ { ^ { ( n ) } } | = 6 \dot { 4 }$ , such that $N \times ( | \Phi ^ { ( n ) } | + | \bar { \Phi _ { \mathrm { n e w } } ^ { ( n ) } } | )$ states had to be evaluated for each epoch. This compares to $N \times M$ states that would be used for standard VAE training (given $M$ samples are drawn per data point). Differently to standard VAE training the $\boldsymbol { \Phi } ^ { ( n ) }$ have to be remembered across iterations. For very large datasets, the additional $\mathcal { O } ( N \times | \Phi ^ { ( n ) } | \times H )$ memory demand can be distributed over compute nodes, however. To further investigate scalability, we went to up to $H { = } 1 0 0 0$ latent variables (while using 100 units in the DNN middle layer). TVAE training time remained in line with the theoretical linear scaling with $H$ while the variational bound further increased. + +Effectiveness: Image Denoising. As we have observed, scaling to large latent spaces does not pose a problem for the presented approach. It is clear, however, that memory and computational cost + +Table 2: Denoising performance in PSNR (dB) for the ‘house’ image for different algorithms with different optimized hyper-parameters. The top category only requires the noisy image. The middle requires additional information such as noise level (KSVD, WNNM, BM3D) or additional noisy images with matched noise level $( \mathrm { n } 2 \mathrm { v } ^ { \dag } )$ . The bottom requires large clean datasets. + +
g=15g=25g=50
N2v*32.0529.2025.42
MTMKL34.2931.8828.08
GSC33.7832.0128.35
S5C33.5032.0828.35
VAR-BSC33.5032.3228.91
TVAE34.27± .0232.65±.0629.98 ± .05
N2vt33.9132.1028.94
KSVD34.3232.1527.95
WNNM35.1333.2230.33
BM3D34.9432.8629.37
EPLL34.1732.1729.12
BDGAN34.5733.2830.61
DPDNN35.4033.5431.04
+ +increase with the number of data points. Above, we processed 100, 000 data points which is still feasible for the small DNNs used. However, larger DNNs increase computational load significantly because $N \times ( | \Phi ^ { ( n ) } | + | \Phi _ { \mathrm { n e w } } ^ { ( n ) } | )$ latent states have to be passed through the decoder. Furthermore, larger DNNs require more data points to not overfit which further increases computational load of our $N$ -dependent method. In many applications, there is, however, anyway relatively few data available which makes the application of large DNNs prohibitive. One example is the task of ‘zeroshot’ denoising, i.e., denoising of an image when only the image itself is available. Learning without clean data recently became very popular. The task is currently addressed using approaches based on standard feed-forward DNNs whose training objectives have been altered to allow for training on noisy images (e.g. Lehtinen et al., 2018; Krull et al., 2019). Deep generative models are, on the other hand, more naturally suited for training on noisy data as their learning objective can be used directly. Shocher et al. (2018) also argue that smaller DNNs are sufficient for the ‘zero-shot’ setting. Because of its recent popularity and suitability for approaches with smaller DNNs, we consequently focus on ‘zero-shot’ denoising. As a very significant additional benefit, the task allows for directly comparing the VAE approach to a large range of other approaches that have recently been suggested. Most notably we can compare to non-deep generative models, large feed-forward DNNs (Zhu et al., 2019; Dong et al., 2019) and DNNs dedicated to learning from noisy data (Lehtinen et al., 2018; Krull et al., 2019). + +The one denoising benchmark that offers the broadest possible comparison to other methods is probably the ‘house’ image (Fig. 4 left). The standard benchmark settings for ‘house’ make use of additive Gaussian white noise with standard deviations $\sigma \in \{ 1 5 , 2 5 , 5 0 \}$ . First, consider the comparison in Tab. 1 where all models used the same patch size of $D = 8 \times 8$ pixels and $H = 6 4$ latent variables (Appendix B for details). Tab. 1 lists the different approaches in terms of the standard measure of peak signal-to-noise ratio (PSNR). Values for MTMKL (Titsias & Lazaro-Gredilla, ´ 2011), GSC (Sheikh et al., 2014) and S5C (Sheikh & Lucke, 2016) were taken from the respective ¨ original publications (which all established new state-of-the-art results when first published). As can be observed, TVAE significantly improves performance for high noise levels. TVAE is able to learn the best data representation for denoising and represents the state-of-the-art in this controlled setting (i.e., fixed $D$ and $H$ ). The decoder DNN of TVAE provides the decisive performance advantage: TVAE significantly improves performance compared to the linear Binary Sparse Coding (var-BSC, Henniges et al., 2010; Shelton et al., 2011), confirming that the high lower bounds of TVAE on natural images translate into improved performance on a concrete benchmark. For $\sigma = 2 5$ and $\sigma = 5 0$ , TVAE also significantly improves on MTMKL, GSC, and S5C. These three approaches are based on a spike-and-slab sparse coding model (also compare Goodfellow et al., 2012). Despite the less flexible Bernoulli prior, the decoder DNN of TVAE provides the highest PSNR values for high noise levels. + +In order to further extend our comparison, in the last experiment we considered the denoising task without controlling for equal conditions. Concretely, we allowed for any approach that performs denoising on the benchmark including approaches that are trained on large image datasets and/or use different patch sizes (including multi-scale and whole image processing). Note that different approaches may employ very different sets of hyper-parameters that can be optimized for denoising performance: for sparse coding approaches, hyper-parameters include patch and dictionary sizes; for DNN approaches they include all network and training scheme hyper-parameters. By allowing for comparison in this less controlled setting, we can include a number of recent approaches including large DNNs trained on clean data and training schemes specifically targeted to noisy training data. Tab. 2 shows the denoising performance for the three noise levels we investigated, with results for other algorithms taken from their corresponding original publications unless specified otherwise. For WNNM and EPLL we cite values from Zhang et al. (2017). The results reported for noise2void (n2v, Krull et al., 2019) were produced specifically for this work (see Appendix B). + +Note that the best performing approaches in Tab. 2 cannot be trained on noisy data: EPLL (Zoran & Weiss, 2011), BDGAN (Zhu et al., 2019) and DPDNN (Dong et al., 2019) all make use of clean training data (typically hundreds of thousands of data points or more). For denoising, EPLL also requires the ground-truth noise level of the test image. Ground-truth noise level information is also required by KSVD (Elad & Aharon, 2006) and WNNM (Gu et al., 2014). As noisy data is very frequently occurring, removing the requirement of clean data has been of considerable interest with, e.g., approaches like noise2noise (n2n, Lehtinen et al., 2018) and noise2void being very actively discussed currently. The n2n approach can achieve denoising performance on noisy training data which is almost as high as the performance of a given DNN when trained on clean data. It would thus outperform all approaches in Tab. 2 except for the bottom three. However, n2n requires different noise realizations of the very same underlying image. noise2void aims to remove this artificial assumption. Considering Tab. 2, PSNR values of TVAE were consistently higher than those of $\mathbf { n } 2 \mathbf { v }$ even if $\mathrm { n } 2 \mathrm { v }$ was trained on external data with matched-noise level $( { \bf n } 2 { \bf v } ^ { \dagger }$ in Tab. 2). Performance of TVAE is $0 . 2 \mathrm { d B }$ lower than BM3D for $\sigma = 2 5$ and $0 . 6 \mathrm { d B }$ higher for $\sigma = 5 0$ , which makes it, for large noise levels, the state-of-the-art on this benchmark in the ‘zero-shot’ setting (i.e., the setting n2n and $\mathrm { n } 2 \mathrm { v }$ aim to address). + +# 4 DISCUSSION + +We investigated a novel way to train VAEs with binary latents. In order to avoid derivatives w.r.t. stochastic discrete latents, we here changed the standard training setup substantially. Updates of the decoder DNN now involve a weighted sum over states (4) and the encoder DNN is replaced by a discrete evolutionary optimization. The direct optimization of the encoder replaces methods that are usually considered indispensable for the training of VAEs: sampling approximation and reparameterization trick. Furthermore, the here investigated encoding model does not use a joint mapping for all datapoints to latent space, i.e., the approach is not amortized. While amortization can be advantageous as information can be shared across datapoints, disadvantages in terms of less tight lower bounds have also been pointed out (e.g. Kim et al., 2018; Cremer et al., 2018). Related to this point, standard VAE training usually involves factored Gaussian approximations of VAE posteriors which can introduce biases (e.g., discussion by Vertes & Sahani, 2018). The investigation ´ of alternatives may therefore, more generally, shed further light on the consequences of specific approximation choices used to define VAE encoders. + +The price we pay for not using amortization is efficiency: we optimize variational parameters for each data point which is, of course, more costly. However, direct optimization can scale VAEs to large latent spaces if smaller DNNs are used. When the use of large DNNs is anyway prohibitive because of limited data, the here studied approach can play out its effectiveness. For the recently popular task of ‘zero-shot’ denoising, we observed state-of-the-art results in a domain where VAEs have not been reported to be competitive before. The competitive performance is presumably due to the approach not being subject to an amortization gap as well as not being based on factored variational distributions. + +Our conclusion is consequently that direct discrete optimization can serve as an alternative for training discrete VAEs. In a sense, the approach can be considered as a brute-force optimization which is slower than conventional amortized training but more effective for scales at which it can be applied. 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In Chinese Conference on Pattern Recognition and Computer Vision, pp. 241–252, 2019. + +Daniel Zoran and Yair Weiss. From Learning Models of Natural Image Patches to Whole Image Restoration. In IEEE International Conference on Computer Vision, pp. 479–486, 2011. + +# A DETAILS OF ENCODER AND DECODER OPTIMIZATION + +![](images/2b7855043a370020906d659795f7c6fcd5c7b6e3f849b7fdfc411ca3e69fc1bf.jpg) +Figure 5: From left to right: generic VAE decoding model, continuous-latent VAE model with Gaussian noise and the binary-latent VAE model of Eqn. (1), in plate notation. + +See Fig. 5 for a graphical comparison between the decoding models of a vanilla VAE and the binary VAE considered here (1). Fig. 6 graphically illustrates different steps to optimize standard VAEs, and additional steps suggested by different contributions in order to optimize discrete VAEs. + +For the optimization of the binary VAE (1), consider the original form of the lower bound, Eqn. (2). When taking derivatives of $\mathcal { F } ( \Phi , \Theta )$ w.r.t. $\Theta$ we can ignore the entropy term1. For the binary VAE model of Eqn. (1) the gradient of the lower bound w.r.t. $W$ is then given by: + +$$ +\begin{array} { r c l } { { \displaystyle \vec { \nabla } _ { W } \mathcal { F } ( \Phi , \Theta ) } } & { { = } } & { { \displaystyle \sum _ { n } \vec { \nabla } _ { W } \big \langle \log \big ( p _ { \Theta } ( \vec { x } ^ { ( n ) } \mid \vec { z } ) p _ { \Theta } ( \vec { z } ) \big ) \big \rangle _ { q _ { \Phi } ^ { ( n ) } } } } \\ { { } } & { { = } } & { { \displaystyle \sum _ { n } \vec { \nabla } _ { W } \big \langle \log \big ( p _ { \Theta } ( \vec { x } ^ { ( n ) } \mid \vec { z } ) \big ) \big \rangle _ { q _ { \Phi } ^ { ( n ) } } = \displaystyle \sum _ { n } \vec { \nabla } _ { W } \big \langle \log \big ( \mathcal { N } ( \vec { x } ^ { ( n ) } ; \vec { \mu } ( \vec { z } , W ) , \sigma ^ { 2 } \mathbb { I } \big ) \big \rangle _ { q _ { \Phi } ^ { ( n ) } } } } \\ { { } } & { { = } } & { { \displaystyle - \frac { 1 } { 2 \sigma ^ { 2 } } \sum _ { n } \vec { \nabla } _ { W } \sum _ { \vec { z } \in \Phi ^ { ( n ) } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } } } \\ { { } } & { { = } } & { { \displaystyle - \frac { 1 } { 2 \sigma ^ { 2 } } \sum _ { n } \sum _ { \vec { z } \in \Phi ^ { ( n ) } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) \vec { \nabla } _ { W } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } , } } \end{array} +$$ + +where the weighting factors $q _ { \Phi } ^ { ( n ) } ( { \vec { z } } )$ are by using (3) and (1) given by: + +$$ +\begin{array} { r c l } { { q _ { \Phi } ^ { ( n ) } ( \vec { z } ) } } & { { = } } & { { \displaystyle \frac { p _ { \Theta } ( \vec { x } ^ { ( n ) } \mid \vec { z } ) p _ { \Theta } ( \vec { z } ) } { \sum _ { \vec { z } ^ { \prime } \in \Phi ^ { ( n ) } } p _ { \Theta } ( \vec { x } ^ { ( n ) } \mid \vec { z } ^ { \prime } ) p _ { \Theta } ( \vec { z } ^ { \prime } ) } } } \\ { { } } & { { = } } & { { \displaystyle \frac { \exp \big ( - \frac { 1 } { 2 \sigma ^ { 2 } } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } - \tilde { \vec { \pi } } ^ { T } \vec { z } \big ) } { \sum _ { \vec { z } ^ { \prime } \in \Phi ^ { ( n ) } } \exp \big ( - \frac { 1 } { 2 \sigma ^ { 2 } } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } ^ { \prime } , W ) \| ^ { 2 } - \tilde { \vec { \pi } } ^ { T } \vec { z } ^ { \prime } \big ) } } } \end{array} +$$ + +for all of the $\vec { z } \in \boldsymbol { \Phi } ^ { ( n ) }$ , rs ere , th $\begin{array} { r } { \tilde { \pi } _ { h } = \log \left( \frac { 1 - \pi _ { h } } { \pi _ { h } } \right) } \end{array}$ . Note that the ated as constan $q _ { \Phi } ^ { ( n ) } ( \vec { z } )$ are evaluated at theor the gradient w.r.t. rent values. $\Theta$ $W$ + +It may be interesting to compare the gradient estimate (11) to the gradient estimate of conventional VAE training. For this consider a standard encoder given by an amortized variational distribution which we shall denote by $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . The distribution $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ could be a Gaussian whose mean and variance are set by passing data point $\vec { x } ^ { ( n ) }$ through encoder DNNs. For discrete VAEs, $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ can be thought of as an analog discrete distribution. If we now take gradients of (6) w.r.t. $W$ and estimate using samples from $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ , we obtain the familiar form: + +$$ +\begin{array} { r c l } { \displaystyle \vec { \nabla } _ { W } \mathcal { F } ( \Phi , \Theta ) } & { = } & { \displaystyle \sum _ { n } \vec { \nabla } _ { W } \Big \langle \log \big ( p _ { \Theta } ( \vec { x } ^ { ( n ) } \mid \vec { z } ) p _ { \Theta } ( \vec { z } ) \big ) \Big \rangle _ { \vec { q } _ { \Phi } ^ { ( n ) } } } \\ & { = } & { \displaystyle \sum _ { n } \vec { \nabla } _ { W } \Big \langle \log \big ( \mathcal { N } ( \vec { x } ^ { ( n ) } ; \vec { \mu } ( \vec { z } , W ) , \sigma ^ { 2 } \mathbb { I } ) \big \rangle _ { \vec { q } _ { \Phi } ^ { ( n ) } } } \\ & { \approx } & { \displaystyle - \frac { 1 } { 2 \sigma ^ { 2 } } \sum _ { n } \frac { 1 } { M } \sum _ { m = 1 } ^ { M } \vec { \nabla } _ { W } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } ^ { ( m ) } , W ) \| ^ { 2 } , \mathrm { ~ w h e r e ~ } \vec { z } ^ { ( m ) } \sim \tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } ) } \end{array} +$$ + +We can slightly rewrite this expression to obtain: + +$$ +\vec { \nabla } _ { W } \mathcal { F } ( \Phi , \Theta ) ~ \approx ~ - \frac { 1 } { 2 \sigma ^ { 2 } } \sum _ { n } \sum _ { \vec { z } \sim \tilde { q } _ { \Phi } ^ { ( n ) } } \left( \frac { 1 } { M } \right) \vec { \nabla } _ { W } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } , +$$ + +If we now compare with the gradient using the truncated approximation $q _ { \Phi } ^ { ( n ) } ( { \vec { z } } )$ + +$$ +\vec { \nabla } _ { W } \mathcal { F } ( \Phi , \Theta ) = - \frac { 1 } { 2 \sigma ^ { 2 } } \sum _ { n } \sum _ { \vec { z } \in \Phi ^ { ( n ) } } q _ { \Phi } ^ { ( n ) } ( \vec { z } ) \vec { \nabla } _ { W } \| \vec { x } ^ { ( n ) } - \vec { \mu } ( \vec { z } , W ) \| ^ { 2 } , +$$ + +one can discuss analogous roles played by the subsets $\boldsymbol { \Phi } ^ { ( n ) }$ (the variational parameters of q(n)Φ (\~z)) and by a standard encoder $\tilde { q } _ { \Phi } ^ { ( n ) }$ . The states in a subset Φ(n) are used to estimate the gradient similar to the samples from a standard encoder $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . The size of $\boldsymbol { \Phi } ^ { ( n ) }$ can consequently be thought of as analog to the number of samples used in a conventional estimation of the gradient. Standard VAE training estimates the gradient by weighting all samples equally (with $( 1 / M )$ ) and the gradient direction is approximated using sufficiently many samples drawn from the current $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . In contrast, truncated gradient estimation uses the states in $\boldsymbol { \Phi } ^ { ( n ) }$ , and the gradient is computed using a weighted summation with weights $q _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . These weights are computed by passing the states $\vec { z }$ through the decoder network. The gradient is then, notably, not a stochastic estimation but exact: gradient ascent is guaranteed (for small steps) to always monotonically increase the variational lower bound. + +Computational Complexity. To add to the discussion of computational complexity of TVAE compared to standard VAE training, consider again Eqns. 13 and 14. If as many samples $M$ are used, per data point, as there are states in each $\boldsymbol { \Phi } ^ { ( n ) }$ , then both sums have the same number of summands. The evaluation of the gradients of the mean square error (MSE) is consequently precisely the same for both approaches. The additional weighting factors $q _ { \Phi } ^ { ( n ) } ( \vec { z } )$ have to be computed for TVAE. However, the weighting factors just represent a small overhead because the evaluation of the decoder DNN for the states in $\boldsymbol { \Phi } ^ { ( n ) }$ is a computation that can be reused from the updates of $\boldsymbol { \Phi } ^ { ( n ) }$ + +The main computational differences are in the updates of Φ(n) compared to the update of encoder DNNs for conventional VAEs. Once the parameters $\Theta = ( W , \sigma ^ { 2 } , { \bar { \vec { \pi } } } )$ are updated using (14), new states for $\boldsymbol { \Phi } ^ { ( n ) }$ have to be sought based on criterion (9). In practice and for each $n$ , we generate $M ^ { \prime }$ new states according to the applied evolutionary procedure. To select the best states we have to pass all these $M ^ { \prime }$ new states through the decoder DNN to evaluate (9). Furthermore, we have to pass all M states already in Φ(n) through the DNN to re-evaluate (9) because the parameters $\Theta$ have changed. In summary, we do require $\mathcal { O } ( N \times \left( M + M ^ { \prime } \right) )$ passes through the decoder DNN. Selecting the $M$ best states from the $( M + M ^ { \prime } )$ states does not add complexity as this can be done in $\mathcal { O } ( M + M ^ { \prime } )$ for each $n$ (Blum et al., 1973). The EA does add to the computational load but parent selection and mutation only add a constant offset for each of the considered states. + +For comparison with standard VAEs, if we use $M$ samples of an encoder $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ , we require $\mathcal { O } ( M \times$ ) passes through the decoder DNN to update the parameters according to (13). For the encoder update, one requires $N \times { \tilde { M } }$ passes through encoder and decoder DNN to estimate the gradient w.r.t. the encoder weights (if we draw $\tilde { M }$ samples for each data point from a conventional encoder distribution $\tilde { q } _ { \Phi } ^ { ( n ) } ( \vec { z } )$ . The additional overhead to actually draw the samples is usually negligible. + +Hence, the computational complexity of TVAE training is comparable if $M \approx M ^ { \prime } \approx \tilde { M }$ . However, conventional VAE training is amortized, i.e., the update of encoder weights uses information from all data points $n$ . In contrast, TVAE training is not amortized, i.e., the $\boldsymbol { \Phi } ^ { ( n ) }$ are updated per data point. The advantage of amortization is that in practice, weights of a conventional encoder can converge faster or (alternatively) less samples $\tilde { M }$ are required. Considering the observed runtimes, more efficient conventional VAE training can presumably in large parts attributed to faster convergence using amortization. Furthermore, the used number of samples $M$ for conventional VAE training is usually smaller than best working sizes of Φ(n) (we used, e.g., |Φ(n) | $| { \Phi } ^ { ^ { ( n ) } } | = 6 4$ and $| { \boldsymbol { \Phi } } ^ { ( n ) } | = 2 0 0$ for denoising, see Tab. 3); and the required storage of $\boldsymbol { \Phi } ^ { ( n ) }$ results in overhead computations. On the other hand, amortization also has disadvantages (e.g. Kim et al., 2018; Cremer et al., 2018). The competitive performance for denoising may consequently be attributed at least in part to TVAE not being subject to an amortization gap. + +![](images/28fcf2926d4d74e4346e81bf3b7039d35652023639a4ede0fe18b3fa6a2251ca.jpg) +Figure 6: Standard series of methods applied to optimize the encoding model of VAEs. Left: methods applied for encoding models of standard VAEs. Middle: additional methods applied to maintain the standard procedure of encoding model optimization also for discrete latent variables. Right: alternative approach to optimize the VAE encoding model using direct discrete optimization. + +# B DETAILS ON THE NUMERICAL EXPERIMENTS + +# B.1 VERIFICATION ON GROUND-TRUTH DATA + +We first evaluated TVAE training on artificial datasets with known ground-truth parameters and loglikelihood, in order to verify the correct functioning of the algorithm and to investigate possible local optima effects. The dataset consisted of $5 0 0 4 \mathrm { x } 4$ images generated by linear superposition of vertical and horizontal bars, with a small amount of Gaussian noise. The DNN’s input and middle layers had 8 units each. The $\Phi ^ { ( n ) }$ variational sets consisted of 64 hidden states each. Fig. 7 shows the evolution of the run that achieved the highest ELBO value out of ten. All parameters were correctly recovered, and the ELBO value was consistent with actual ground-truth log-likelihood. + +Such a simple test, however, can also be solved by linear models. In order to demonstrate that TVAEs can solve non-linear problems, taking advantage of the neural network non-linearity embedded in the generative model, we introduced correlations between pairs of bars: the bars combinations shown in the first two datapoints from the left in Fig. 8 were discouraged from appearing together. We employed the same evolutionary scheme and again we selected the run with highest peak ELBO value out of ten. The model correctly learns that certain combinations of bars are much more unlikely than others, and correctly estimates their likelihood. + +![](images/2a6b04221e9ae44435f5a6d9105878e4322c3702f6543e98f05d8e32a9dce63d.jpg) +Figure 7: TVAE training on simple bars data: noiseless output of the TVAE’s DNN for the 8 possible one-hot input vectors over several training epochs. Generating parameters are in the last row. + +![](images/18ac5c6b9ab26009afa724c2a4f8213b294d061feb31af9d3055cb0d8f1edbce.jpg) +Figure 8: Correlated bars test. The plot shows the ratio between inferred and ground-truth loglikelihoods $\log p _ { \Theta } ( \vec { x } )$ of datapoints with interesting bar combinations. The inferred values are reported below the datapoints themselves. + +Fig. 9 offers some more insight into the correlated bars test experiment described. The left section of the figure shows the generative parameters for the dataset used: $W _ { 0 }$ is the $8 \mathrm { x } 8$ weight matrix of the top-to-middle layer: this makes it so that the activation of the first latent variable inhibits activation of the second, and activation of the last latent variable inhibits activation of the last. Concretely, this results in a dataset where these specific bars combinations are discouraged from appearing. The weights $W _ { 1 }$ , visualized as $8 4 \mathrm { x } 4$ matrices, generate the actual bars. $\sigma ^ { 2 }$ was set to 0.01 and the dataset contained an average of two superimposing bars per datapoint $\pi _ { h } = 2 / 8$ for each $h$ ). + +The middle section of the figure shows the ELBO values (averages over all batches for each epoch) as training progresses. The cyclic learning rate schedule is responsible for the oscillatory behavior. + +The right section shows some example datapoints together with samples from the trained TVAE model that reached the highest ELBO value out of the ten runs. + +![](images/dc0cbe1af3b8b15e73702eaecae44249051888aa76aa16c38dc8063e30376cb5.jpg) +Figure 9: From left to right: generative parameters for the correlated bars test; ELBO values over epochs for 10 runs; example datapoints and samples from the generative model. + +# B.2 DENOISING + +Given a trained TVAE with parameters $\Theta$ , we estimated the value of a pixel in a single patch as $x _ { d } ^ { \mathrm { e s t } } = \langle x _ { d } \rangle _ { p \Theta ( x _ { d } | \vec { x } ) }$ . When using $\begin{array} { r } { p _ { \Theta } ( x _ { d } \mid \vec { x } ) = \sum _ { \{ \vec { z } \} } p _ { \Theta } ( x _ { d } \mid \vec { z } ) p _ { \Theta } ( \vec { z } \mid \vec { x } ) } \end{array}$ we obtain: + +$$ +x _ { d } ^ { \mathrm { e s t } } = \Big \langle \langle x _ { d } \rangle _ { p _ { \Theta } ( x _ { d } | \vec { z } ) } \Big \rangle _ { p _ { \Theta } ( \vec { z } | \vec { x } ) } = \langle \mu _ { d } ( \vec { z } ) \rangle _ { p _ { \Theta } ( \vec { z } | \vec { x } ) } . +$$ + +The expectation value on the right-hand-side of Eqn. (15) is then approximated based on the encoding parameters $\boldsymbol { \Phi } ^ { ( n ) }$ using truncated posteriors. Finally, we took a weighted average of the estimates of a pixel value in different patches (see, e.g., Burger et al., 2012) in order to generate the pixel values of the full denoised image. + +In Tab. 3 we list the exact hyper-parameters used to obtain the PSNR values reported. In parentheses, the parameters for the run on data with noise level $\sigma = 5 0$ and unconstrained hyper-parameters are given, when they differ from the other experiments. + +Table 3: Hyper-parameters for the denoising experiments on the house image. + +
Neural network units Input (H) 64 (512) Middle 64 (512)
Output (D) 64 (144) Cyclic Learning Rates
Min 1.r. 0.0001
Max l.r. 0.01 (0.05)
Epochs/cycle 20 Batch size 32
Evolutionaryparameters
Parents 10 (5) Children 9 (4) Generations 4(1)
+ +Table 4: Denoising performance of $\mathbf { n } 2 \mathbf { v }$ in PSNR (dB) for the ‘house’ image with AWG noise. For comparison, we additionally list the performance of TVAE (numbers copied from Tab. 2). PSNR values for $\mathrm { n } 2 \mathrm { v } ^ { \star }$ are obtained by training only on the noisy image (i.e., in the same setting as used for MTMKL, GSC, var-BSC and TVAE in Tab. 2. More training data improves performance for $\mathbf { n } 2 \mathbf { v } .$ . PSNR values for $\mathrm { n } 2 \mathrm { \bar { v } } ^ { \dagger }$ show performance if additional training data in the form of noisy images with AWG noise $\sigma = 2 5$ is used. Further improvements (especially for high noise) are obtained if the $\mathrm { n } 2 \mathrm { v }$ network is trained on training data with a noise level that matches the noise of the test set $\mathrm { ( s e e \ n 2 v ^ { \ddagger } ) }$ ). For instance, we used for $\mathrm { n } 2 \mathrm { v } ^ { \ddag }$ training data with $\sigma = 5 0$ to denoise the ‘house’ with $\sigma = 5 0$ . See text for further details. + +
0=15g=25q=50
n2v*32.0529.2025.42
n2vt32.9332.1020.96
n2vt33.9132.1028.94
TVAE34.27 ± .0232.65 ± .0629.98 ± .05
+ +To evaluate the performance on standard denoising benchmarks, we first compared TVAE to related probabilistic sparse coding approaches such as MTMKL, GSC and var-BSC (Tab. 1). MTMKL and GSC use the data model of spike-and-slab sparse coding and for training mean-field and truncated posterior approximations with pre-selection are used, respectively. Compared to MTMKL and GSC, var-BSC uses a less complex data model and a training scheme also based on evolutionary optimization (Guiraud et al., 2018). The denoising performance observed in the scenario with controlled conditions (Tab. 1) shows that for high noise level $( \sigma = 5 0 $ ), var-BSC achieves higher PSNR values than MTMKL and GSC although the method uses a simpler data model. This observation demonstrates the effectiveness of the evolutionary training method used by var-BSC. However, PSNR values for TVAE are significantly higher due to the higher flexibility in modeling the data distribution provided by the used DNN. + +In a second step, Tab. 2 compared the performance of TVAE with respect to different denoising approaches including deterministic sparse coding (KSVD), a mixture model approach (EPLL), a non-local image processing method (WNNM) and state-of-the-art denoising methods based on deep neural networks (BDGAN and DPDNN). These approaches can be distinguished, e.g., by the amount of employed training data and by the requirement for clean data. + +TVAE as well as MTMKL, GSC and var-BSC do not require clean images for training. Furthermore, all these approaches can be trained if only the single noisy image is available (‘zero-shot’ learning; compare, e.g., Shocher et al., 2018; Imamura et al., 2019). Instead, EPLL, BDGAN and DPDNN use clean training data (typically tens or hundreds of thousands of data points are collected for training). + +Approaches such as noise2noise $\mathtt { n 2 n }$ Lehtinen et al., 2018) and noise2void (n2v Krull et al., 2019) occupy a middle ground: they can be trained on noisy data but they typically require much larger amounts of data than, e.g., TVAE or MTMKL. In the original n2v publication, for instance, 400 (noisy) $1 8 0 \times 1 8 0$ BSD (Martin et al., 2001) images were used to create a training dataset (this procedure also involved data augmentation; compare Krull et al. 2019). For our comparison with results of Tab. 2, we used the standard, publicly available code for $\mathbf { n } 2 \mathbf { v }$ together with the default training set $\sigma = 2 5$ ) employed in the original n2v publication. We then applied the trained $\mathbf { n } 2 \mathbf { v }$ network to denoise the ‘house’ image with $\sigma = 2 5$ . The resulting PSNR value was $3 2 . 1 0 d B$ which is $0 . 7 6 d B$ lower than the PSNR value for BM3D $( 3 2 . 8 6 d B )$ . The difference is consistent with an on average $0 . 8 8 d B$ lower performance of $\mathbf { n } 2 \mathbf { v }$ compared to BM3D on the BSD68 test set (see Krull et al., 2019). The same network can also be used to denoise an image with lower or higher noise level. The $\mathbf { n } 2 \mathbf { v }$ network trained on $\sigma = 2 5$ does, for instance, result in PSNR values of $3 2 . 9 3 d B$ for the ‘house’ image with $\sigma = 1 5$ and in $2 0 . 9 6 d B$ for the ‘house’ image with $\sigma = 5 0$ (see $n 2 v ^ { \dagger }$ in Tab. 4). Especially for high noise levels performance can be much improved, however, if the n2v network is trained using images with the same noise level as the test image. In order to do so, we followed the procedure described in the $\mathbf { n } 2 \mathbf { v }$ publication while adapting the noise level of $\sigma = 1 5$ in one case and $\sigma = 5 0$ for the other case. Trained on a dataset with matched noise, we then denoised the ‘house’ image with $\sigma = 1 5$ in the one, and $\sigma = 5 0$ in the other case (results listed as $\mathrm { n } 2 \mathrm { v } ^ { \ddag }$ in Tab. 4). The PSNR values obtained for ‘house’ in this matched-noise-level scenario are much higher compared to the scenario with unmatched noise level (e.g., for $\sigma = 5 0$ the PSNR improvement is approximately 8 dB). The much lower performance for mismatched noise for $\mathbf { n } 2 \mathbf { v }$ is in this respect consistent with observations for standard DNN denoising for which training with the ground-truth noise level has been pointed out as important for performance (Chaudhury & Roy, 2017; Zhang et al., 2018). + +The $\mathrm { n } 2 \mathrm { v }$ approach can avoid having to know the exact noise level, e.g., if it is trained on just the single noisy image. In a last experiment, we hence investigated this ‘zero-shot’ denoising feature of n2v and applied the algorithm to denoise the ‘house’ image while using the same noisy image for training that we seek to denoise (we took the publicly available code of $\mathrm { n } 2 \mathrm { v }$ as an example and manually adjusted hyperparameters as follows: we set the ”Percentage of pixel to manipulate per patch” to a value of 0.4, as ”Number of training epochs” we used 400 and we set the ”Number of parameter update steps per epoch” to 33). The obtained PSNR values are listed as $\mathrm { n } 2 \mathrm { v } ^ { \ast }$ in Tab. 4. + +From Tab. 4 it can be observed, that for all considered training settings of $\mathrm { n } 2 \mathrm { v }$ and all noise levels, PSNR values of TVAE are consistently higher than those of $\mathbf { n } 2 \mathbf { v }$ even if $\mathrm { n } 2 \mathrm { v }$ is trained on external data with matched-noise level. Additional parameter tuning may improve performance of $\mathrm { n } 2 \mathrm { v } ^ { \ast }$ to a certain extent but PSNRs are in general much lower than $\mathrm { \hat { n } } 2 \mathrm { v } ^ { \ddag }$ . While we followed for $\mathrm { n } 2 \mathrm { v } ^ { \ddag }$ the standard hyperparameter setting of the original paper/code publication of $\mathbf { n } 2 \mathbf { v }$ (Krull et al., 2019), we cannot exclude further improvements with parameter fine tuning for the ‘house’ benchmark. However, we remark that the difference of $\mathrm { n } 2 \mathrm { v } ^ { \ddag }$ and BM3D for the ‘house’ benchmark is on the very same range as the differences between n2v and BM3D as reported on the BSD data set in the original n2v publication. The stronger performing BM3D is according to denoising performance the preferable comparison and as such included in Tab. 2. In terms of efficiency, the $\mathrm { n } 2 \mathrm { v }$ approach is in general (once trained) faster than BM3D as well as TVAE, however. + +PSNR values of noise2noise $( \mathtt { n 2 n } )$ are usually very closely aligned with PSNR values achievable by feed-forward DNNs. More concretely, $\mathfrak { n } 2 \mathfrak { n }$ uses, for instance, a RED30 network (Mao et al., 2016) which achieves 31.07 dB PSNR on the BSD300 data set if trained on clean data. If directly trained on noisy data, RED30 achieves 31.06 dB (Lehtinen et al., 2018). n2n is thus strongly performing in terms of PSNR. The caveat of n2n compared to n2v is, however, that the noisy data n2n uses is rather artificial. The pairs of images n2n is trained on consist of two different noise realization of the same underlying clean image. For real data, such a setting is only approximately occurring at most, which has motivated the n2v approach. + +Like n2v, BDGAN and DPDNN are optimized for specific noise levels (specific standard deviations are used to generate the noisy training examples). EPLL is trained exclusively on clean image patches; for denoising, the algorithm requires the ground-truth noise level of the test image as input parameter. Ground-truth noise level information is also required by KSVD and WNNM. + +Like all approaches in the top category of Tab. 2, TVAE does not require ground-truth noise level information, nor clean images, nor large amounts of training data. For the ‘zero-shot’ setting, TVAE is consequently the best performing system on the ‘house’ benchmark. Such a high performance is notably achieved using a basic DNN and relatively small patch sizes of $D = 8 \times 8$ (for $\sigma = 1 5$ and $\sigma = 2 5$ ) or $D = 1 2 \times 1 2$ (for $\sigma = 5 0$ ). All feed-forward DNNs for denoising use much larger patches (e.g., n2v use $6 4 \times 6 4$ ). That a competitive denoising performance can be achieved for small patches, in general, argues in favor for VAE approaches to denoising. Indeed, TVAE even comes close to state-of-the-art approaches (BDGAN and DPDNN) that use very intricate DNN architectures and large amounts of clean training data. We believe that such results underline the potential of the here investigated approach although the novelty of the approach is the focus rather than extensive benchmarking. + +On the other hand, an important limitation of TVAE is its computational demand. For our experiments on the ‘house’ image with noise level $\sigma = 5 0$ in Tab. 2 we used $N = 6 0 0 2 5$ patches of $D = 1 2 \times 1 2$ pixels, which amounts to all possible non-overlapping square patches of that size that can be extracted from the image. For training and denoising we used a TVAE with $H = 5 1 2$ latent variables, sizes of $| { \Phi } ^ { ( n ) } | = 6 4 $ , and 512 units in the DNN middle layer of the decoder. TVAE training required 49 seconds per training epoch when executing on a single NVIDIA Titan $\mathrm { X p }$ GPU and $2 . 5 \mathrm { G B }$ of GPU memory. We ran for 500 epochs which required between seven and eight hours on the single GPU. We did not observe significant changes in variational bound values or in denoising performance after 500 epochs in any of the experiments we conducted for Tabs 1 and 2. Runtime complexity increased linear with the number of data points $N$ , with the dimensionality of the data $D$ , with the number of the latents $H$ , and with the size of the DNN used. Runtimes also increased approximately proportional w.r.t. the size of $\boldsymbol { \Phi } ^ { ( n ) }$ . Empirically we observed a sublinear scaling with |Φ(n) | presumably because of significant overhead computations: for example, increasing from $| { \boldsymbol { \Phi } } ^ { ( n ) } | = 6 4$ to $| { \Phi } ^ { ( n ) } | = 1 2 8$ (while keeping all other parameters as above) computational time increases from 49 seconds per training epoch to 75 seconds. + +For noise levels $\sigma = 1 5$ and $\sigma = 2 5$ in Tab. 2 we used smaller patch sizes $( D = 8 \times 8 )$ ) and fewer stochastic latents $H = 6 4$ ) but larger $\boldsymbol { \Phi } ^ { ( n ) }$ (i.e., $| { \Phi } ^ { ( n ) } | = 2 0 \bar { 0 } )$ . In general, if the patch size $D$ is increased, more structure has to be captured. This can be done either by increasing the size of the stochastic latents $H$ or by using larger DNNs. Both, in turn, requires more training data in order to estimate the increased number of parameters. In the current setup, the sizes of $D$ which are currently feasible are comparably small. The denoising performance based on small patches is, however, notably very high. + +For comparison, n2v uses up to $D = 6 4 \times 6 4$ and also all other feed-forward DNN approaches use significantly larger patch sizes than TVAE (and the other approaches in category 1). Still, n2v can be trained efficiently on large patches requiring approximately 19 hours on a NVIDIA Tesla K80 GPU for training on approximately $3 \mathrm { k }$ noisy images of shape $1 8 0 \mathrm { x } 1 8 0$ and seconds for the denoising of one 256x256 image. The higher computational demand of TVAE is also the reason why averaging across databases with many images (such as BSD68) or applications to large single images quickly becomes infeasible. As a novel approach, TVAE is, however, far from being fully optimized algorithmically compared to large feed-forward approaches, and there is certainly further potential to improve training efficiency. + +While denoising is, in general, well suited for deep generative models, performance for standard image denoising is by far not as common as such results for standard DNNs (which may also be related to efficiency aspects). An exception is a recent GAN approach (BDGAN; Zhu et al., 2019). VAEs are often evaluated using binarized MNIST with approximate log-likelihoods for comparison; that benchmark, however, is not consistent with the Gaussian noise model used here and does not allow a direct comparison with feed-forward DNNs which are the state-of-the-art. \ No newline at end of file diff --git a/parse/train/P42rXLGZQ07/P42rXLGZQ07_content_list.json b/parse/train/P42rXLGZQ07/P42rXLGZQ07_content_list.json new file mode 100644 index 0000000000000000000000000000000000000000..6355b4c245a4981c6d1071240d25d77afaba8145 --- /dev/null +++ b/parse/train/P42rXLGZQ07/P42rXLGZQ07_content_list.json @@ -0,0 +1,2231 @@ +[ + { + "type": "text", + "text": "DIRECT EVOLUTIONARY OPTIMIZATION OF VARIATIONAL AUTOENCODERS WITH BINARY LATENTS ", + "text_level": 1, + "bbox": [ + 176, + 99, + 839, + 146 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Anonymous authors Paper under double-blind review ", + "bbox": [ + 183, + 171, + 398, + 198 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "ABSTRACT ", + "text_level": 1, + "bbox": [ + 454, + 236, + 544, + 251 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Discrete latent variables are considered important to model the generation process of real world data, which has motivated research on Variational Autoencoders (VAEs) with discrete latents. However, standard VAE training is not possible in this case, which has motivated different strategies to manipulate discrete distributions in order to train discrete VAEs similarly to conventional ones. Here we ask if it is also possible to keep the discrete nature of the latents fully intact by applying a direct discrete optimization for the encoding model. The studied approach is consequently strongly diverting from standard VAE training by altogether sidestepping absolute standard VAE mechanisms such as sampling approximation, reparameterization trick and amortization. Discrete optimization is realized in a variational setting using truncated posteriors in conjunction with evolutionary algorithms (using a recently suggested approach). For VAEs with binary latents, we first show how such a discrete variational method (A) ties into gradient ascent for network weights and (B) uses the decoder network to select latent states for training. More conventional amortized training is, as may be expected, more efficient than direct discrete optimization, and applicable to large neural networks. However, we here find direct optimization to be efficiently scalable to hundreds of latent variables using smaller networks. More importantly, we find the effectiveness of direct optimization to be highly competitive in ‘zero-shot’ learning (where high effectiveness for small networks is required). In contrast to large supervised neural networks, the here investigated VAEs can, e.g., denoise a single image without previous training on clean data and/or training on large image datasets. More generally, the studied approach shows that training of VAEs is indeed possible without sampling-based approximation and reparameterization, which may be interesting for the analysis of VAE-training in general. In the regime of few data, direct optimization, furthermore, makes VAEs competitive for denoising where they have previously been outperformed by non-generative approaches. ", + "bbox": [ + 233, + 272, + 764, + 643 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "1 INTRODUCTION AND RELATED WORK ", + "text_level": 1, + "bbox": [ + 176, + 680, + 522, + 696 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Variational autoencoders (Kingma & Welling, 2014; Rezende et al., 2014) are prominent and very actively researched models for unsupervised learning. VAEs, in their many different variations, have successfully been applied to a large number of tasks including semi-supervised learning (e.g. Maaløe et al., 2016), anomaly detection (e.g. An & Cho, 2015; Kiran et al., 2018), sentence interpolation (Bowman et al., 2016), music interpolation (Roberts et al., 2018) and drug response prediction (Rampasek et al., 2017). The success of VAEs rests on a series of methods that enable the derivation of scalable training algorithms to optimize their model parameters (discussed further below). A desired feature when applying VAEs to a given problem is that their latent variables (i.e., the encoder output variables) correspond to meaningful properties of the data, ideally to those latent causes that have originally generated the data. However, many real-world datasets suggest the use of discrete latents as they often describe the data generation process more naturally. For instance, the presence or absence of objects in images is best described by binary latents (e.g. Jojic & Frey, 2001). Discrete latents are also a popular choice in modeling sounds; for instance, describing piano sounds may naturally involve binary latents: keys are pressed or not (e.g. Titsias & Lazaro-Gredilla, ´ 2011; Goodfellow et al., 2013; Sheikh et al., 2014). The success of standard forms of VAEs has ", + "bbox": [ + 174, + 715, + 825, + 922 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "consequently spurred research on novel formulations that feature discrete latents (e.g. Rolfe, 2016; \nKhoshaman & Amin, 2018; Roy et al., 2018; Sadeghi et al., 2019; Vahdat et al., 2019). ", + "bbox": [ + 171, + 103, + 823, + 132 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "The objective of VAE training is the optimization of a generative data model which parameterizes a given data distribution. Typically we seek model parameters $\\Theta$ of a VAE that maximize the data log-likelihood, $\\begin{array} { r } { \\mathrm { L } ( \\Theta ) = \\sum _ { n } \\log \\left( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } ) \\right) } \\end{array}$ , where we denote by $\\vec { x } ^ { ( 1 : N ) }$ a set of $N$ observed data points, and where $p _ { \\Theta } ( \\vec { x } )$ denotes the modeled data distribution. Like conventional autoencoders (e.g., Bengio et al., 2007), VAEs use a deep neural network (DNN) to generate (or decode) observables $\\vec { x }$ from a latent code $\\vec { z }$ . Unlike conventional autoencoders, however, the generation of data $\\vec { x }$ is not deterministic but it takes the form of a probabilistic generative model. ", + "bbox": [ + 173, + 138, + 825, + 239 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "For VAEs with binary latent variables, as they will be of interest here, we consider the following VAE generative model: ", + "bbox": [ + 176, + 246, + 825, + 273 + ], + "page_idx": 1 + }, + { + "type": "equation", + "img_path": "images/f8edc23be805e25f0d5792a4bb55f7f28d732c15601a166dea0c72075c0ffe0f.jpg", + "text": "$$\n\\begin{array} { r } { p _ { \\Theta } ( \\vec { z } ) = \\mathrm { B e r n } ( \\vec { z } ; \\vec { \\pi } ) = \\prod _ { h } \\big ( \\pi _ { h } ^ { z _ { h } } ( 1 - \\pi _ { h } ) ^ { ( 1 - z _ { h } ) } \\big ) , \\qquad p _ { \\Theta } ( \\vec { x } \\mid \\vec { z } ) = \\mathcal { N } \\big ( \\vec { x } ; \\vec { \\mu } ( \\vec { z } ; W ) , \\sigma ^ { 2 } \\mathbb { I } \\big ) , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 191, + 281, + 785, + 301 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "where $\\vec { z } \\in \\{ 0 , 1 \\} ^ { H }$ is a binary code and the non-linear function $\\vec { \\mu } ( \\vec { z } ; W )$ is a DNN that outputs the mean of the Gaussian distribution. $p _ { \\Theta } ( \\vec { x } \\vert \\vec { z } )$ is commonly referred to as decoder. The set of model parameters is $\\Theta = \\{ \\vec { \\pi } , W , \\sigma ^ { 2 } \\}$ , where $W$ incorporates DNN weights and biases. We assume homoscedasticity of the Gaussian distribution, but note that there is no obstacle to generalizing the model by inserting a DNN non-linearity that outputs a correlation matrix. Similarly, the algorithm could easily be generalized to different noise distributions should the task at hand call for it. For the purpose of this work, however, we will focus on as elementary as possible VAEs, with the form shown in Eqn. (1). ", + "bbox": [ + 174, + 306, + 825, + 420 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Given standard or binary-latent VAEs, essentially all learning algorithms seek to approximately maximize the log-likelihood using the following series of methods (we elaborate in the appendix): ", + "bbox": [ + 176, + 426, + 823, + 455 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "(A) Instead of the log-likelihood, a variational lower-bound (a.k.a. ELBO) is optimized. \n(B) VAE posteriors are approximated by an encoding model, that is a specific distribution (often Gaussian) parameterized by one or more DNNs. \n(C) The variational parameters of the encoder are optimized using gradient ascent on the lower bound, where the gradient is evaluated based on sampling and reparameterization trick to obtain sufficiently low-variance and yet efficiently computable estimates. \n(D) Using samples from the encoder, the parameters of the decoder are optimized using gradient ascent on the variational lower bound. ", + "bbox": [ + 200, + 463, + 825, + 579 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Optimization procedures for VAEs with discrete latents follow the same steps (Points A to D). However, discrete or binary latents pose substantial further obstacles in learning, mainly due to the fact that backpropagation through discrete variables is generally not possible (Rolfe, 2016; Bengio et al., 2013). In order to maintain the general VAE framework for encoder optimization, different groups have therefore suggested different possible solutions: work by Rolfe (2016), for instance, extends VAEs with discrete latents by auxiliary continuous latents such that gradients can still be computed. Work on the concrete distribution (Maddison et al., 2016) or Gumbel-softmax distribution (Jang et al., 2016) proposes newly defined continuous distributions that contain discrete distributions as limit cases. Work by Lorberbom et al. (2019) merges the Gumbel-Max reparameterization with the use of direct loss minimization for gradient estimation, enabling efficient training on structured latent spaces. Finally, work by van den Oord et al. (2017), and Roy et al. (2018) combines VAEs with a vector quantization (VQ) stage in the latent layer. Latents become discrete through quantization but gradients for learning are adapted from latent values before they are processed by the VQ stage. All methods have the goal of treating discrete distributions such that standard VAE training as developed for continuous latents can still be applied. These techniques interact during training with the standard methods (Points A-D) already in place for VAE optimization. Furthermore, they add further types of design decisions and hyper-parameters, for example parameters for annealing from softened discrete distributions to the (hard) original distributions for discrete latents. ", + "bbox": [ + 173, + 583, + 825, + 833 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "For discrete VAEs, it may consequently be a desirable goal to investigate alternative, more direct optimization procedures that do not require a softening of discrete distributions or the use of other indirect solutions. Such a direct approach is challenging, however, because once DNNs are used to define the encoding model (Point B) standard tricks to estimate gradients (Point C) seem unavoidable. A direct optimization procedure, as is investigated here, consequently has to substantially change VAE training. For the data model (1) we will maintain the variational setting and a decoding model with DNNs as non-linearity (Points A and D). However, we will not use an encoder model parameterized by DNNs (Point B). Instead, the variational bound will be increased w.r.t. the encoder model by using a discrete optimization approach. The procedure does not require gradients to be computed for the encoder such that discrete latents are addressed without the use of reparameterization trick and sampling approximations. ", + "bbox": [ + 174, + 840, + 823, + 924 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 102, + 825, + 174 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "2 TRUNCATED VARIATIONAL OPTIMIZATION ", + "text_level": 1, + "bbox": [ + 174, + 194, + 562, + 210 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Let us consider the variational lower bound of the likelihood. If we denote by $q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )$ the variational distributions with parameters $\\boldsymbol { \\Phi } ^ { ( n ) }$ , and by $\\begin{array} { r } { \\left. h ( \\vec { z } ) \\right. _ { q _ { \\Phi } ^ { ( n ) } } = \\sum _ { \\vec { z } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) h ( \\vec { z } ) } \\end{array}$ expectation values w.r.t. to $q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )$ , then the lower bound can be written as: ", + "bbox": [ + 173, + 223, + 825, + 281 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/7a7ed7bc476115e84ca37d44ec70dd0ac296dc0bedebfaf09aa23f522754f058.jpg", + "text": "$$\n\\begin{array} { r } { \\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\vert \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } - \\sum _ { n } \\big \\langle \\log \\big ( q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 248, + 289, + 748, + 314 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "The general challenge for the maximization of $\\mathcal { F } ( \\Phi , \\Theta )$ is the optimization of the encoding model $q _ { \\Phi } ^ { ( n ) }$ . VAEs with discrete latents add to this challenge the problem of taking gradients w.r.t. discrete latents. If we seek to avoid derivatives w.r.t. discrete variables, we have to define an alternative encoding model $q _ { \\Phi } ^ { ( n ) }$ but such an encoding has to remain sufficiently efficient. Considering prior work on generative models with discrete latents, variational distributions based on truncated posteriors offer themselves as such an alternative (Lucke & Sahani, 2008). Truncated posterior approxima- ¨ tions have been shown to be functionally competitive (e.g. Sheikh et al., 2014; Hughes & Sudderth, 2016; Shelton et al., 2017), and they are able to efficiently train also very large scale models with hundreds or thousands of latents (e.g. Shelton et al., 2011; Sheikh & Lucke, 2016; Forster & L ¨ ucke, ¨ 2018). However, the important question for training discrete VAEs is if or how truncated variational distributions can be used in gradient-based optimization of neural network parameters. We here, for the first time, address this question noting that all previous approaches relied on closed-form (or pseudo-closed form) parameter update equations in an expectation-maximization learning paradigm. ", + "bbox": [ + 173, + 320, + 826, + 508 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Optimization of the Decoding Model. In order to optimize the parameters $W$ of the decoder DNN $\\vec { \\mu } ( \\vec { z } , W )$ , the gradient of the variational bound (2) w.r.t. $W$ has to be computed. We consequently need, for any VAE, a sufficiently precise and efficient approximation of the expectation value w.r.t. the encoder $q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . Gradient estimation is of central importance for deep unsupervised learning, and approaches, e.g., for variance reduction of estimators have played an important role and are dedicated solely to this purpose (e.g., Williams, 1992). Reparameterization finally emerged as a key method because it allowed for sufficiently low-variance estimation of gradients based, e.g., on Gaussian middle-layer units (Kingma & Welling, 2014; Rezende et al., 2014). ", + "bbox": [ + 173, + 513, + 825, + 631 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "For discrete VAEs, however, reparameterization requires the introduction of additional manipulations of discrete distributions that we here seek to fully avoid. ", + "bbox": [ + 174, + 636, + 820, + 665 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Instead of using reparameterization or variance reduction, we will compute gradients based on truncated posterior as variational distributions. A truncated posterior has the following form: ", + "bbox": [ + 174, + 671, + 821, + 700 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/c047b01917f1235f0c1dd8f594493139afbcafd1bb643a621681b0e6261b243b.jpg", + "text": "$$\n\\begin{array} { r l } { q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) : = } & { \\frac { p _ { \\Theta } ( \\vec { z } | \\vec { x } ^ { ( n ) } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } \\left( \\vec { z } ^ { \\prime } | \\vec { x } ^ { ( n ) } \\right) } = \\frac { p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ^ { \\prime } ) p _ { \\Theta } \\left( \\vec { z } ^ { \\prime } \\right) } \\mathrm { i f } \\vec { z } \\in \\Phi ^ { ( n ) } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 194, + 707, + 782, + 746 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "where for all $\\vec { z } \\not \\in \\boldsymbol { \\Phi } ^ { ( n ) }$ the probability $q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ equals zero. That is, a variational distribution q(n)Φ (\\~z) is proportional to the true posteriors in a subset $\\boldsymbol { \\Phi } ^ { ( n ) }$ , which acts as its variational parameter. ", + "bbox": [ + 174, + 753, + 830, + 790 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "We can now compute the gradient of (2) w.r.t. the decoder weights $W$ which results in: ", + "bbox": [ + 171, + 795, + 745, + 810 + ], + "page_idx": 2 + }, + { + "type": "equation", + "img_path": "images/133d65dbd4628205618395c413dccfe7f428cedfb6b93985c1d45467fe477069.jpg", + "text": "$$\n\\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) = - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) ~ \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } .\n$$", + "text_format": "latex", + "bbox": [ + 274, + 816, + 723, + 858 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "The right-hand-side has salient similarities to the standard gradient ascent for VAE decoders. Especially the familiar gradient of the mean squared error (MSE) shows that, e.g., standard automatic differentiation tools can be applied. However, the decisive difference are the weighting factors $q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . Considering (3), in order to compute the weighting factors we require all $\\vec { z } \\in \\boldsymbol { \\Phi } ^ { ( n ) }$ to be passed through the decoder DNN. As all states of Φ(n) anyway have to be passed through the decoder for the MSE term of (4), the overall computational complexity is not higher than an estimation of the gradient with samples instead of states in $\\boldsymbol { \\Phi } ^ { ( n ) }$ (we elaborate in Appendix A). ", + "bbox": [ + 173, + 864, + 825, + 925 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 101, + 825, + 150 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "To complete the decoder optimization, update equations for variance $\\sigma ^ { 2 }$ and prior parameters $\\vec { \\pi }$ can be computed in closed-form (compare, e.g., Shelton et al., 2011) and are given by: ", + "bbox": [ + 171, + 155, + 823, + 185 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/7c860de06ef9e51d22ce71284f77c4fbec8a7e41914a4ff2af80875324988396.jpg", + "text": "$$\n\\begin{array} { r } { \\sigma ^ { 2 , \\mathrm { n e w } } = \\frac { 1 } { D N } \\displaystyle \\sum _ { n } \\displaystyle \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } , \\qquad \\vec { \\pi } ^ { \\mathrm { n e w } } = \\frac { 1 } { N } \\displaystyle \\sum _ { n } \\displaystyle \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\vec { z } , } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 196, + 189, + 781, + 223 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where $N$ is the number of samples in the training dataset and $D$ is the number of observables. ", + "bbox": [ + 173, + 227, + 785, + 242 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Optimization of the Encoding Model. After having established that the decoder can be optimized efficiently and by using standard DNN methods, the important question is if the encoder can be trained efficiently. Encoder optimization is usually based on a reformulation of the variational bound (2) given by: ", + "bbox": [ + 173, + 248, + 826, + 305 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/af4af5b504a73659e4afd012cbf0204eaf8e2792c228836182bf08c923eaf4ab.jpg", + "text": "$$\n\\begin{array} { r } { \\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } - \\sum _ { n } D _ { \\mathrm { K L } } \\big ( q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) , p _ { \\Theta } ( \\vec { z } ) \\big ) . } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 264, + 309, + 733, + 335 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Centrally for this work, truncated posteriors allow a specific alternative reformulation of the bound that enables efficient optimization. The reformulation recombines the entropy term of the original form (2) with the first expectation value into a single term, and is given by (see Lucke, 2019, for ¨ details): ", + "bbox": [ + 174, + 338, + 825, + 393 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/20ac1161402cbccc5fd371a47ba60e20971824da08658e271cf3e5743f28cd23.jpg", + "text": "$$\n\\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\log \\big ( \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) .\n$$", + "text_format": "latex", + "bbox": [ + 336, + 391, + 660, + 429 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Thanks to the simplified form of the bound, the variational parameters $\\boldsymbol { \\Phi } ^ { ( n ) }$ of the encoding model can now be sought using direct discrete optimization procedures. More concretely, because of the specific form (7), pairwise comparisons of joint probabilities are sufficient to maximize the lower bound: if we update the set $\\Phi ^ { ( { \\bar { n } } ) }$ for a given $\\vec { x } ^ { ( n ) }$ by replacing a state $\\vec { z } ^ { \\mathrm { o l d } } \\in \\boldsymbol { \\Phi } ^ { ( n ) }$ with a state $\\vec { z } ^ { \\mathrm { n e w } } \\not \\in \\boldsymbol { \\Phi } ^ { ( n ) }$ , then $\\mathcal { F } ( \\Phi , \\Theta )$ increases if and only if: ", + "bbox": [ + 173, + 434, + 825, + 512 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/e146622ce45fea5b3d5dbb827339176fa3b94cb5e79a2c728275ed59cffb9308.jpg", + "text": "$$\n\\log \\left( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } , \\vec { z } ^ { \\mathrm { n e w } } ) \\right) > \\log \\left( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } , \\vec { z } ^ { \\mathrm { o l d } } ) \\right) .\n$$", + "text_format": "latex", + "bbox": [ + 341, + 517, + 655, + 537 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "To obtain intuition for the pairwise comparison, consider its form when inserting the binary VAE (1) into the left- and right-hand sides. Eliding terms that do not depend on $\\vec { z }$ we obtain: ", + "bbox": [ + 174, + 541, + 823, + 570 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/ac24f96e6a022cc22fd5e5dd2a9e577ee8ad0f9f641cc5b4a9146788615e6a74.jpg", + "text": "$$\n\\begin{array} { r } { \\widetilde { \\log p } _ { \\Theta } ( \\vec { x } , \\vec { z } ) = - \\| \\vec { x } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } - 2 \\sigma ^ { 2 } \\sum _ { h } \\widetilde { \\pi } _ { h } z _ { h } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 323, + 574, + 673, + 595 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where $\\tilde { \\pi } _ { h } = \\log \\left( ( 1 - \\pi _ { h } ) / \\pi _ { h } \\right)$ . The expression assumes an even more familiar form if we restrict ourselves for a moment to sparse priors $\\pi < { \\frac { 1 } { 2 } }$ , i.e., $\\tilde { \\pi } > 0$ . Criterion (8) then becomes: ", + "bbox": [ + 173, + 601, + 825, + 632 + ], + "page_idx": 3 + }, + { + "type": "equation", + "img_path": "images/6a64438f88fe5029b0400ee7b2a9b2a20ee9497fbac0142c1537f9987a3d32f7.jpg", + "text": "$$\n\\begin{array} { r } { \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } ^ { \\mathrm { n e w } } , W ) \\| ^ { 2 } + 2 \\sigma ^ { 2 } \\tilde { \\pi } | \\vec { z } ^ { \\mathrm { n e w } } | ~ < ~ \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } ^ { \\mathrm { o l d } } , W ) \\| ^ { 2 } + 2 \\sigma ^ { 2 } \\tilde { \\pi } | \\vec { z } ^ { \\mathrm { o l d } } | } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 202, + 638, + 767, + 657 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "where $\\begin{array} { r } { | \\vec { z } | = \\sum _ { h = 1 } ^ { H } z _ { h } } \\end{array}$ . Such functions are routinely encountered in sparse coding or compressive sensing (Eldar & Kutyniok, 2012): for each set $\\boldsymbol { \\Phi } ^ { ( n ) }$ we seek those states $\\vec { z }$ that are reconstructing $\\vec { x } ^ { ( n ) }$ well while being sparse $\\vec { z }$ with few non-zero bits). For VAEs, $\\vec { \\mu } ( \\vec { z } ^ { \\mathrm { n e w } } , W )$ is a DNN and as such much more flexible in matching the distribution of observables $\\vec { x }$ than can be expected from linear mappings. Furthermore, criteria like (10) usually emerge for maximum a-posteriori (MAP) training in sparse coding (Olshausen & Field, 1996). In contrast, we here seek a population of states $\\vec { z }$ in $\\Phi ^ { ( n ) }$ for each data point. It is a consequence of the reformulated lower bound (7) that it remains optimal to evaluate joint probabilities (as for MAP) although the constructed population of states $\\boldsymbol { \\Phi } ^ { ( n ) }$ can capture (unlike MAP training) a rich posterior structure. ", + "bbox": [ + 173, + 661, + 825, + 803 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "But how can new states ${ \\vec { z } } ^ { \\mathrm { n e w } }$ that optimize $\\boldsymbol { \\Phi } ^ { ( n ) }$ be found efficiently in high-dimensional latent spaces? Random search and search by sampling has recently been explored for elementary generative models (Lucke et al., 2018). Here we will follow another recent suggestion (Guiraud et al., ¨ 2018) and make use of a search based on evolutionary algorithms (EAs). In this setting we interpret sets $\\boldsymbol { \\Phi } ^ { ( n ) }$ as populations of binary genomes $\\vec { z }$ and base the fitness function on Eqn. (9). ", + "bbox": [ + 173, + 809, + 825, + 886 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Concretely, using $\\boldsymbol { \\Phi } ^ { ( n ) }$ as initial parent pool, we apply the following genetic operators in sequence: firstly, parent selection picks $N _ { p }$ states from the parent pool. In our numerical experiments we used ", + "bbox": [ + 174, + 893, + 823, + 924 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "A.Parent selectionB.MutationC.New population ", + "bbox": [ + 174, + 102, + 500, + 113 + ], + "page_idx": 4 + }, + { + "type": "image", + "img_path": "images/9ac5796e15c2abf03775e735e88196f8ed4ac0a48e8267479695a7378d10fa67.jpg", + "image_caption": [ + "Figure 1: The optimization process of the variational parameters $\\Phi ^ { ( n ) }$ using evolutionary search. A. Some states are selected as parents. B. Each child undergoes mutation. C. Children are merged with the original population and the least fit are discarded. " + ], + "image_footnote": [], + "bbox": [ + 179, + 114, + 493, + 184 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "fitness-proportional parent selection, for which we add an offset (constant w.r.t. $\\vec { z }$ ) to the fitness values in order to make them strictly non-negative. Each of the children undergoes mutation: one or more bits are flipped to further increase offspring diversity. In our experiments we perform random uniform selection of the bits to flip. Crossover could also be employed to increase offspring diversity. We repeat the procedure using the children generated this way as the parent pool, giving birth to multiple generations of candidate states. Finally, we update $\\boldsymbol { \\Phi } ^ { ( n ) }$ by substituting individuals with low fitness with candidates with higher fitness. The whole procedure can be seen as an evolutionary algorithm with perfect memory or very strong elitism (individuals with higher fitness never drop out of the gene pool). Note that the improvement of the variational lower bound depends on generating as many as possible different children with high fitness over the course of training. ", + "bbox": [ + 173, + 210, + 825, + 353 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "We point out that the EAs optimize each $\\boldsymbol { \\Phi } ^ { ( n ) }$ independently, so this technique can be applied to large datasets in conjunction with stochastic or batch gradient descent on the model parameters $\\Theta$ : it does not require to keep the full dataset (or all sets $\\boldsymbol { \\Phi } ^ { ( n ) }$ ) in memory at a given time. Fig 1 shows how EAs produce new states that are used to update each set $\\boldsymbol { \\Phi } ^ { ( n ) }$ . The full training procedure for binary VAEs is summarized in Algorithm 1. ", + "bbox": [ + 173, + 361, + 825, + 440 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Algorithm 1 Training Truncated Variational Autoencoders ", + "text_level": 1, + "bbox": [ + 155, + 463, + 544, + 478 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Initialize model parameters $\\Theta = \\{ W , \\vec { \\pi } , \\sigma ^ { 2 } \\}$ \nInitialize each Φ(n) with $S$ distinct latent states \nrepeat for all batches in dataset do for sample $_ n$ in batch do $\\Phi ^ { n e w } = \\Phi ^ { ^ { ( n ) } }$ for all generations do Φnew mutation (crossover (selection $( \\Phi ^ { n e w } ) )$ ) $\\boldsymbol { \\Phi } ^ { ( n ) } = \\boldsymbol { \\Phi } ^ { ( n ) } \\cup \\boldsymbol { \\Phi } ^ { n e w }$ end for Truncate $\\boldsymbol { \\Phi } ^ { ( n ) }$ to $S$ fittest elements based on (9) end for Use Adam to update $W$ using objective (4) end for Use (5) to update $\\vec { \\pi }$ , $\\sigma ^ { 2 }$ \nuntil parameters $\\Theta$ have sufficiently converged ", + "bbox": [ + 163, + 482, + 532, + 700 + ], + "page_idx": 4 + }, + { + "type": "image", + "img_path": "images/2bc6269339c0e4affc63a21c98617219d8cf4f53bbc0d2971dd59f7f4f440ed2.jpg", + "image_caption": [ + "Figure 2: Graphical representation of the model architecture used in numerical experiments. " + ], + "image_footnote": [], + "bbox": [ + 563, + 496, + 821, + 613 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "3 NUMERICAL EXPERIMENTS ", + "text_level": 1, + "bbox": [ + 176, + 723, + 436, + 739 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Having defined the training procedure, we numerically investigated its properties. After first verifying that the procedure can recover generating parameters using ground-truth data (see Appendix B), we conducted experiments to address the following two standard questions: ", + "bbox": [ + 174, + 756, + 825, + 797 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "(1) How efficient, i.e. how scalable, is the direct discrete optimization of binary VAEs? (2) How effective is the procedure, i.e., how well does it perform for a given VAE model? ", + "bbox": [ + 169, + 804, + 758, + 833 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "In all numerical experiments, the training of the DNN parameters based on (4) is performed with mini-batches, the Adam optimizer (Kingma & Ba, 2014) and decaying or cyclical learning rate scheduling (Smith, 2017). Xavier/Glorot initialization (Glorot $\\&$ Bengio, 2010) is used for the DNN weights, while biases are always zero-initialized. Parameters $\\vec { \\pi }$ and $\\sigma ^ { 2 }$ are updated via Eqn. (5) and initialized to $\\textstyle { \\frac { 1 } { H } }$ $H$ is the size of $\\vec { \\pi }$ ) and 0.01 respectively. Hyper-parameter optimization was conducted manually and, for the more complex datasets, it also made use of black box Bayesian optimization based on Gaussian Processes (Nogueira, 2019). We will refer to the binary VAE trained with the method described above as Truncated Variational Autoencoder (TVAE) as the use of truncated posteriors is the main distinguishing feature. ", + "bbox": [ + 174, + 840, + 825, + 924 + ], + "page_idx": 4 + }, + { + "type": "table", + "img_path": "images/997f51ca42eb09e30f90f7c8c3a01162e1a29303d506b67f4943e4ea07f8f49b.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
g=15g=25g=50
MTMKL34.2931.8828.08
GSC32.6831.1028.02
VAR-BSC32.2531.1528.62
TVAE34.27 ± .0232.65 ± .0629.61± .02
", + "bbox": [ + 408, + 102, + 781, + 180 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "", + "bbox": [ + 176, + 218, + 823, + 260 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Scalability and improvement on linear models. Let us first numerically investigate scalability properties of TVAE especially in comparison with linear models. After verifying parameter recovery for ground-truth data (see Appendix B), we used natural data in the form of image patches as an intermediately large scale and natural dataset. Concretely, we used 100,000 whitened image patches of $1 6 \\times 1 6$ pixels extracted from a standard image database (van Hateren & van der Schaaf, 1998) and pre-processed as in Guiraud et al. (2018). ", + "bbox": [ + 173, + 267, + 825, + 351 + ], + "page_idx": 5 + }, + { + "type": "image", + "img_path": "images/a89cb8777ccb03c1af036831a57ce347819b931b4fcc37a3ff12df3f99e95270.jpg", + "image_caption": [ + "Table 1: Denoising performance in PSNR (dB) for the ‘house’ image under controlled conditions $\\scriptstyle { \\mathcal { D } } = 8 \\times 8$ , $H { = } 6 4$ for all algorithms). " + ], + "image_footnote": [], + "bbox": [ + 176, + 577, + 460, + 676 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "The simplest possible VAEs would use linear mappings for the decoder $\\vec { \\mu } ( \\vec { z } , W )$ . For standard Gaussian latents, a linear VAE can recover probabilistic PCA solutions (e.g. Lucas et al., 2019). For Bernoulli latents, we would recover binary sparse coding (Haft et al., 2004; Shelton et al., 2011) solutions. We therefore start training (using $H = 3 0 0$ latents) with a linear VAE. After 100 epochs the weights of the linear mapping were used to initialize the bottom layer of a deeper decoder network with three layers of 300, 300 and $1 6 \\times 1 6 = 2 5 6$ units. The weights of the deeper layers were simply initialized to the identity matrix. Furthermore, prior and variance were optimized. The described setup guarantees a common starting point for linear and non-linear VAEs such that the difference provided by deeper decoder DNNs can be highlighted. Fig. 3 shows the variational bounds during learning of the linear VAE compared to the non-linear VAE for a typical experiment. The non-linear VAE can be observed to quickly and significantly optimize the lower bound beyond a linear VAE. We will later (when we are not interested in comparisons to linear VAEs) simply optimize the weights of non-linear TVAE directly as we did not observed an advantage by first optimizing a linear VAE. ", + "bbox": [ + 173, + 358, + 825, + 551 + ], + "page_idx": 5 + }, + { + "type": "image", + "img_path": "images/be5972d41617605cdac7f1e82da43139d1803097042d0f2204b119824795367a.jpg", + "image_caption": [ + "Figure 3: ELBO gain of TVAE compared to linear VAE with binary latents (on $1 6 \\times 1 6$ image patches). ", + "Figure 4: TVAE denoising of house image with noise level $\\sigma ~ = ~ 5 0$ . The denoised image has $\\mathrm { P S N R } { = } 3 0 . 0 3$ , the best of the runs of Tab. 2. " + ], + "image_footnote": [], + "bbox": [ + 500, + 580, + 821, + 670 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Compared to shallow linear models, we observed a similar efficiency and scalability of TVAE. The main additional computational costs are given by passing the latent states through the a full decoder DNN instead of just through a linear mapping. The sets of states used could be kept small, at size $S = | \\boldsymbol \\Phi ^ { ^ { ( n ) } } | = 6 \\dot { 4 }$ , such that $N \\times ( | \\Phi ^ { ( n ) } | + | \\bar { \\Phi _ { \\mathrm { n e w } } ^ { ( n ) } } | )$ states had to be evaluated for each epoch. This compares to $N \\times M$ states that would be used for standard VAE training (given $M$ samples are drawn per data point). Differently to standard VAE training the $\\boldsymbol { \\Phi } ^ { ( n ) }$ have to be remembered across iterations. For very large datasets, the additional $\\mathcal { O } ( N \\times | \\Phi ^ { ( n ) } | \\times H )$ memory demand can be distributed over compute nodes, however. To further investigate scalability, we went to up to $H { = } 1 0 0 0$ latent variables (while using 100 units in the DNN middle layer). TVAE training time remained in line with the theoretical linear scaling with $H$ while the variational bound further increased. ", + "bbox": [ + 173, + 739, + 825, + 888 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Effectiveness: Image Denoising. As we have observed, scaling to large latent spaces does not pose a problem for the presented approach. It is clear, however, that memory and computational cost ", + "bbox": [ + 173, + 895, + 823, + 924 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Table 2: Denoising performance in PSNR (dB) for the ‘house’ image for different algorithms with different optimized hyper-parameters. The top category only requires the noisy image. The middle requires additional information such as noise level (KSVD, WNNM, BM3D) or additional noisy images with matched noise level $( \\mathrm { n } 2 \\mathrm { v } ^ { \\dag } )$ . The bottom requires large clean datasets. ", + "bbox": [ + 173, + 99, + 370, + 292 + ], + "page_idx": 6 + }, + { + "type": "table", + "img_path": "images/b9819f33d12bf14a37d6ecfb62362c20dc7e594b2e6f05c851cf808f251cbf24.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
g=15g=25g=50
N2v*32.0529.2025.42
MTMKL34.2931.8828.08
GSC33.7832.0128.35
S5C33.5032.0828.35
VAR-BSC33.5032.3228.91
TVAE34.27± .0232.65±.0629.98 ± .05
N2vt33.9132.1028.94
KSVD34.3232.1527.95
WNNM35.1333.2230.33
BM3D34.9432.8629.37
EPLL34.1732.1729.12
BDGAN34.5733.2830.61
DPDNN35.4033.5431.04
", + "bbox": [ + 411, + 101, + 782, + 308 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "increase with the number of data points. Above, we processed 100, 000 data points which is still feasible for the small DNNs used. However, larger DNNs increase computational load significantly because $N \\times ( | \\Phi ^ { ( n ) } | + | \\Phi _ { \\mathrm { n e w } } ^ { ( n ) } | )$ latent states have to be passed through the decoder. Furthermore, larger DNNs require more data points to not overfit which further increases computational load of our $N$ -dependent method. In many applications, there is, however, anyway relatively few data available which makes the application of large DNNs prohibitive. One example is the task of ‘zeroshot’ denoising, i.e., denoising of an image when only the image itself is available. Learning without clean data recently became very popular. The task is currently addressed using approaches based on standard feed-forward DNNs whose training objectives have been altered to allow for training on noisy images (e.g. Lehtinen et al., 2018; Krull et al., 2019). Deep generative models are, on the other hand, more naturally suited for training on noisy data as their learning objective can be used directly. Shocher et al. (2018) also argue that smaller DNNs are sufficient for the ‘zero-shot’ setting. Because of its recent popularity and suitability for approaches with smaller DNNs, we consequently focus on ‘zero-shot’ denoising. As a very significant additional benefit, the task allows for directly comparing the VAE approach to a large range of other approaches that have recently been suggested. Most notably we can compare to non-deep generative models, large feed-forward DNNs (Zhu et al., 2019; Dong et al., 2019) and DNNs dedicated to learning from noisy data (Lehtinen et al., 2018; Krull et al., 2019). ", + "bbox": [ + 174, + 335, + 825, + 590 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "The one denoising benchmark that offers the broadest possible comparison to other methods is probably the ‘house’ image (Fig. 4 left). The standard benchmark settings for ‘house’ make use of additive Gaussian white noise with standard deviations $\\sigma \\in \\{ 1 5 , 2 5 , 5 0 \\}$ . First, consider the comparison in Tab. 1 where all models used the same patch size of $D = 8 \\times 8$ pixels and $H = 6 4$ latent variables (Appendix B for details). Tab. 1 lists the different approaches in terms of the standard measure of peak signal-to-noise ratio (PSNR). Values for MTMKL (Titsias & Lazaro-Gredilla, ´ 2011), GSC (Sheikh et al., 2014) and S5C (Sheikh & Lucke, 2016) were taken from the respective ¨ original publications (which all established new state-of-the-art results when first published). As can be observed, TVAE significantly improves performance for high noise levels. TVAE is able to learn the best data representation for denoising and represents the state-of-the-art in this controlled setting (i.e., fixed $D$ and $H$ ). The decoder DNN of TVAE provides the decisive performance advantage: TVAE significantly improves performance compared to the linear Binary Sparse Coding (var-BSC, Henniges et al., 2010; Shelton et al., 2011), confirming that the high lower bounds of TVAE on natural images translate into improved performance on a concrete benchmark. For $\\sigma = 2 5$ and $\\sigma = 5 0$ , TVAE also significantly improves on MTMKL, GSC, and S5C. These three approaches are based on a spike-and-slab sparse coding model (also compare Goodfellow et al., 2012). Despite the less flexible Bernoulli prior, the decoder DNN of TVAE provides the highest PSNR values for high noise levels. ", + "bbox": [ + 173, + 597, + 825, + 847 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "In order to further extend our comparison, in the last experiment we considered the denoising task without controlling for equal conditions. Concretely, we allowed for any approach that performs denoising on the benchmark including approaches that are trained on large image datasets and/or use different patch sizes (including multi-scale and whole image processing). Note that different approaches may employ very different sets of hyper-parameters that can be optimized for denoising performance: for sparse coding approaches, hyper-parameters include patch and dictionary sizes; for DNN approaches they include all network and training scheme hyper-parameters. By allowing for comparison in this less controlled setting, we can include a number of recent approaches including large DNNs trained on clean data and training schemes specifically targeted to noisy training data. Tab. 2 shows the denoising performance for the three noise levels we investigated, with results for other algorithms taken from their corresponding original publications unless specified otherwise. For WNNM and EPLL we cite values from Zhang et al. (2017). The results reported for noise2void (n2v, Krull et al., 2019) were produced specifically for this work (see Appendix B). ", + "bbox": [ + 174, + 854, + 823, + 924 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 825, + 215 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Note that the best performing approaches in Tab. 2 cannot be trained on noisy data: EPLL (Zoran & Weiss, 2011), BDGAN (Zhu et al., 2019) and DPDNN (Dong et al., 2019) all make use of clean training data (typically hundreds of thousands of data points or more). For denoising, EPLL also requires the ground-truth noise level of the test image. Ground-truth noise level information is also required by KSVD (Elad & Aharon, 2006) and WNNM (Gu et al., 2014). As noisy data is very frequently occurring, removing the requirement of clean data has been of considerable interest with, e.g., approaches like noise2noise (n2n, Lehtinen et al., 2018) and noise2void being very actively discussed currently. The n2n approach can achieve denoising performance on noisy training data which is almost as high as the performance of a given DNN when trained on clean data. It would thus outperform all approaches in Tab. 2 except for the bottom three. However, n2n requires different noise realizations of the very same underlying image. noise2void aims to remove this artificial assumption. Considering Tab. 2, PSNR values of TVAE were consistently higher than those of $\\mathbf { n } 2 \\mathbf { v }$ even if $\\mathrm { n } 2 \\mathrm { v }$ was trained on external data with matched-noise level $( { \\bf n } 2 { \\bf v } ^ { \\dagger }$ in Tab. 2). Performance of TVAE is $0 . 2 \\mathrm { d B }$ lower than BM3D for $\\sigma = 2 5$ and $0 . 6 \\mathrm { d B }$ higher for $\\sigma = 5 0$ , which makes it, for large noise levels, the state-of-the-art on this benchmark in the ‘zero-shot’ setting (i.e., the setting n2n and $\\mathrm { n } 2 \\mathrm { v }$ aim to address). ", + "bbox": [ + 174, + 222, + 825, + 444 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "4 DISCUSSION ", + "text_level": 1, + "bbox": [ + 174, + 464, + 310, + 479 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "We investigated a novel way to train VAEs with binary latents. In order to avoid derivatives w.r.t. stochastic discrete latents, we here changed the standard training setup substantially. Updates of the decoder DNN now involve a weighted sum over states (4) and the encoder DNN is replaced by a discrete evolutionary optimization. The direct optimization of the encoder replaces methods that are usually considered indispensable for the training of VAEs: sampling approximation and reparameterization trick. Furthermore, the here investigated encoding model does not use a joint mapping for all datapoints to latent space, i.e., the approach is not amortized. While amortization can be advantageous as information can be shared across datapoints, disadvantages in terms of less tight lower bounds have also been pointed out (e.g. Kim et al., 2018; Cremer et al., 2018). Related to this point, standard VAE training usually involves factored Gaussian approximations of VAE posteriors which can introduce biases (e.g., discussion by Vertes & Sahani, 2018). The investigation ´ of alternatives may therefore, more generally, shed further light on the consequences of specific approximation choices used to define VAE encoders. ", + "bbox": [ + 174, + 496, + 825, + 676 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "The price we pay for not using amortization is efficiency: we optimize variational parameters for each data point which is, of course, more costly. However, direct optimization can scale VAEs to large latent spaces if smaller DNNs are used. When the use of large DNNs is anyway prohibitive because of limited data, the here studied approach can play out its effectiveness. For the recently popular task of ‘zero-shot’ denoising, we observed state-of-the-art results in a domain where VAEs have not been reported to be competitive before. The competitive performance is presumably due to the approach not being subject to an amortization gap as well as not being based on factored variational distributions. ", + "bbox": [ + 174, + 683, + 823, + 794 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "Our conclusion is consequently that direct discrete optimization can serve as an alternative for training discrete VAEs. In a sense, the approach can be considered as a brute-force optimization which is slower than conventional amortized training but more effective for scales at which it can be applied. To our knowledge, the approach is also the first training method for VAEs that is not using samplingbased gradient estimates, and the first which makes VAEs competitive for ‘zero-shot’ denoising. ", + "bbox": [ + 174, + 801, + 823, + 871 + ], + "page_idx": 7 + }, + { + "type": "text", + "text": "REFERENCES ", + "text_level": 1, + "bbox": [ + 174, + 102, + 287, + 118 + ], + "page_idx": 8 + }, + { + "type": "text", + "text": "Jinwon An and Sungzoon Cho. Variational autoencoder based anomaly detection using reconstruction probability. Special Lecture on IE, 2(1), 2015. 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", + "bbox": [ + 174, + 155, + 823, + 184 + ], + "page_idx": 11 + }, + { + "type": "text", + "text": "A DETAILS OF ENCODER AND DECODER OPTIMIZATION ", + "text_level": 1, + "bbox": [ + 174, + 102, + 658, + 118 + ], + "page_idx": 12 + }, + { + "type": "image", + "img_path": "images/2b7855043a370020906d659795f7c6fcd5c7b6e3f849b7fdfc411ca3e69fc1bf.jpg", + "image_caption": [ + "Figure 5: From left to right: generic VAE decoding model, continuous-latent VAE model with Gaussian noise and the binary-latent VAE model of Eqn. (1), in plate notation. " + ], + "image_footnote": [], + "bbox": [ + 192, + 148, + 808, + 275 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "See Fig. 5 for a graphical comparison between the decoding models of a vanilla VAE and the binary VAE considered here (1). Fig. 6 graphically illustrates different steps to optimize standard VAEs, and additional steps suggested by different contributions in order to optimize discrete VAEs. ", + "bbox": [ + 174, + 356, + 825, + 398 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "For the optimization of the binary VAE (1), consider the original form of the lower bound, Eqn. (2). When taking derivatives of $\\mathcal { F } ( \\Phi , \\Theta )$ w.r.t. $\\Theta$ we can ignore the entropy term1. For the binary VAE model of Eqn. (1) the gradient of the lower bound w.r.t. $W$ is then given by: ", + "bbox": [ + 173, + 405, + 826, + 448 + ], + "page_idx": 12 + }, + { + "type": "equation", + "img_path": "images/fa9f8a048c7882355c6971eed8da677a56cc9fabe6d3e4738dfe3bfd8bc6dbea.jpg", + "text": "$$\n\\begin{array} { r c l } { { \\displaystyle \\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) } } & { { = } } & { { \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } } } \\\\ { { } } & { { = } } & { { \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } = \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\big \\langle \\log \\big ( \\mathcal { N } ( \\vec { x } ^ { ( n ) } ; \\vec { \\mu } ( \\vec { z } , W ) , \\sigma ^ { 2 } \\mathbb { I } \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } } } \\\\ { { } } & { { = } } & { { \\displaystyle - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\vec { \\nabla } _ { W } \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } } } \\\\ { { } } & { { = } } & { { \\displaystyle - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } , } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 181, + 457, + 833, + 609 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "where the weighting factors $q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )$ are by using (3) and (1) given by: ", + "bbox": [ + 174, + 619, + 632, + 638 + ], + "page_idx": 12 + }, + { + "type": "equation", + "img_path": "images/7c06a3d6a560ff2e03cee56fdad6b4387ec09243225dcc70ec014ecc3c266dd7.jpg", + "text": "$$\n\\begin{array} { r c l } { { q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) } } & { { = } } & { { \\displaystyle \\frac { p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ^ { \\prime } ) p _ { \\Theta } ( \\vec { z } ^ { \\prime } ) } } } \\\\ { { } } & { { = } } & { { \\displaystyle \\frac { \\exp \\big ( - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } - \\tilde { \\vec { \\pi } } ^ { T } \\vec { z } \\big ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } \\exp \\big ( - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } ^ { \\prime } , W ) \\| ^ { 2 } - \\tilde { \\vec { \\pi } } ^ { T } \\vec { z } ^ { \\prime } \\big ) } } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 271, + 647, + 723, + 741 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "for all of the $\\vec { z } \\in \\boldsymbol { \\Phi } ^ { ( n ) }$ , rs ere , th $\\begin{array} { r } { \\tilde { \\pi } _ { h } = \\log \\left( \\frac { 1 - \\pi _ { h } } { \\pi _ { h } } \\right) } \\end{array}$ . Note that the ated as constan $q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ are evaluated at theor the gradient w.r.t. rent values. $\\Theta$ $W$ ", + "bbox": [ + 171, + 751, + 825, + 785 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "It may be interesting to compare the gradient estimate (11) to the gradient estimate of conventional VAE training. For this consider a standard encoder given by an amortized variational distribution which we shall denote by $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . The distribution $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ could be a Gaussian whose mean and variance are set by passing data point $\\vec { x } ^ { ( n ) }$ through encoder DNNs. For discrete VAEs, $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ can be thought of as an analog discrete distribution. If we now take gradients of (6) w.r.t. $W$ and estimate using samples from $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ , we obtain the familiar form: ", + "bbox": [ + 173, + 790, + 825, + 868 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "", + "bbox": [ + 171, + 102, + 547, + 119 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/c21763cd400d333e7bb89b04bfb361a65c0e4bff247d329c7e9e8ec9e46e5e35.jpg", + "text": "$$\n\\begin{array} { r c l } { \\displaystyle \\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) } & { = } & { \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\Big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) \\Big \\rangle _ { \\vec { q } _ { \\Phi } ^ { ( n ) } } } \\\\ & { = } & { \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\Big \\langle \\log \\big ( \\mathcal { N } ( \\vec { x } ^ { ( n ) } ; \\vec { \\mu } ( \\vec { z } , W ) , \\sigma ^ { 2 } \\mathbb { I } ) \\big \\rangle _ { \\vec { q } _ { \\Phi } ^ { ( n ) } } } \\\\ & { \\approx } & { \\displaystyle - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\frac { 1 } { M } \\sum _ { m = 1 } ^ { M } \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } ^ { ( m ) } , W ) \\| ^ { 2 } , \\mathrm { ~ w h e r e ~ } \\vec { z } ^ { ( m ) } \\sim \\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 191, + 122, + 808, + 236 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "We can slightly rewrite this expression to obtain: ", + "bbox": [ + 173, + 236, + 493, + 251 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/6352337080329949ec83a6012209aee7816dd9c7a5573d1a378cdd4f056af58b.jpg", + "text": "$$\n\\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) ~ \\approx ~ - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\sum _ { \\vec { z } \\sim \\tilde { q } _ { \\Phi } ^ { ( n ) } } \\left( \\frac { 1 } { M } \\right) \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } ,\n$$", + "text_format": "latex", + "bbox": [ + 269, + 252, + 727, + 296 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "If we now compare with the gradient using the truncated approximation $q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )$ ", + "bbox": [ + 174, + 303, + 700, + 319 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/325c06c086a32d7495506bdbd76b4ea2a33036ff04fedf900c08d770c515ba19.jpg", + "text": "$$\n\\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) = - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } ,\n$$", + "text_format": "latex", + "bbox": [ + 261, + 320, + 735, + 363 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "one can discuss analogous roles played by the subsets $\\boldsymbol { \\Phi } ^ { ( n ) }$ (the variational parameters of q(n)Φ (\\~z)) and by a standard encoder $\\tilde { q } _ { \\Phi } ^ { ( n ) }$ . The states in a subset Φ(n) are used to estimate the gradient similar to the samples from a standard encoder $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . The size of $\\boldsymbol { \\Phi } ^ { ( n ) }$ can consequently be thought of as analog to the number of samples used in a conventional estimation of the gradient. Standard VAE training estimates the gradient by weighting all samples equally (with $( 1 / M )$ ) and the gradient direction is approximated using sufficiently many samples drawn from the current $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . In contrast, truncated gradient estimation uses the states in $\\boldsymbol { \\Phi } ^ { ( n ) }$ , and the gradient is computed using a weighted summation with weights $q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . These weights are computed by passing the states $\\vec { z }$ through the decoder network. The gradient is then, notably, not a stochastic estimation but exact: gradient ascent is guaranteed (for small steps) to always monotonically increase the variational lower bound. ", + "bbox": [ + 173, + 367, + 826, + 529 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Computational Complexity. To add to the discussion of computational complexity of TVAE compared to standard VAE training, consider again Eqns. 13 and 14. If as many samples $M$ are used, per data point, as there are states in each $\\boldsymbol { \\Phi } ^ { ( n ) }$ , then both sums have the same number of summands. The evaluation of the gradients of the mean square error (MSE) is consequently precisely the same for both approaches. The additional weighting factors $q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ have to be computed for TVAE. However, the weighting factors just represent a small overhead because the evaluation of the decoder DNN for the states in $\\boldsymbol { \\Phi } ^ { ( n ) }$ is a computation that can be reused from the updates of $\\boldsymbol { \\Phi } ^ { ( n ) }$ ", + "bbox": [ + 173, + 535, + 825, + 643 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "The main computational differences are in the updates of Φ(n) compared to the update of encoder DNNs for conventional VAEs. Once the parameters $\\Theta = ( W , \\sigma ^ { 2 } , { \\bar { \\vec { \\pi } } } )$ are updated using (14), new states for $\\boldsymbol { \\Phi } ^ { ( n ) }$ have to be sought based on criterion (9). In practice and for each $n$ , we generate $M ^ { \\prime }$ new states according to the applied evolutionary procedure. To select the best states we have to pass all these $M ^ { \\prime }$ new states through the decoder DNN to evaluate (9). Furthermore, we have to pass all M states already in Φ(n) through the DNN to re-evaluate (9) because the parameters $\\Theta$ have changed. In summary, we do require $\\mathcal { O } ( N \\times \\left( M + M ^ { \\prime } \\right) )$ passes through the decoder DNN. Selecting the $M$ best states from the $( M + M ^ { \\prime } )$ states does not add complexity as this can be done in $\\mathcal { O } ( M + M ^ { \\prime } )$ for each $n$ (Blum et al., 1973). The EA does add to the computational load but parent selection and mutation only add a constant offset for each of the considered states. ", + "bbox": [ + 173, + 650, + 825, + 799 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "For comparison with standard VAEs, if we use $M$ samples of an encoder $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ , we require $\\mathcal { O } ( M \\times$ ) passes through the decoder DNN to update the parameters according to (13). For the encoder update, one requires $N \\times { \\tilde { M } }$ passes through encoder and decoder DNN to estimate the gradient w.r.t. the encoder weights (if we draw $\\tilde { M }$ samples for each data point from a conventional encoder distribution $\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )$ . The additional overhead to actually draw the samples is usually negligible. ", + "bbox": [ + 174, + 808, + 825, + 887 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Hence, the computational complexity of TVAE training is comparable if $M \\approx M ^ { \\prime } \\approx \\tilde { M }$ . However, conventional VAE training is amortized, i.e., the update of encoder weights uses information from all data points $n$ . In contrast, TVAE training is not amortized, i.e., the $\\boldsymbol { \\Phi } ^ { ( n ) }$ are updated per data point. The advantage of amortization is that in practice, weights of a conventional encoder can converge faster or (alternatively) less samples $\\tilde { M }$ are required. Considering the observed runtimes, more efficient conventional VAE training can presumably in large parts attributed to faster convergence using amortization. Furthermore, the used number of samples $M$ for conventional VAE training is usually smaller than best working sizes of Φ(n) (we used, e.g., |Φ(n) | $| { \\Phi } ^ { ^ { ( n ) } } | = 6 4$ and $| { \\boldsymbol { \\Phi } } ^ { ( n ) } | = 2 0 0$ for denoising, see Tab. 3); and the required storage of $\\boldsymbol { \\Phi } ^ { ( n ) }$ results in overhead computations. On the other hand, amortization also has disadvantages (e.g. Kim et al., 2018; Cremer et al., 2018). The competitive performance for denoising may consequently be attributed at least in part to TVAE not being subject to an amortization gap. ", + "bbox": [ + 174, + 895, + 823, + 924 + ], + "page_idx": 13 + }, + { + "type": "image", + "img_path": "images/28fcf2926d4d74e4346e81bf3b7039d35652023639a4ede0fe18b3fa6a2251ca.jpg", + "image_caption": [ + "Figure 6: Standard series of methods applied to optimize the encoding model of VAEs. Left: methods applied for encoding models of standard VAEs. Middle: additional methods applied to maintain the standard procedure of encoding model optimization also for discrete latent variables. Right: alternative approach to optimize the VAE encoding model using direct discrete optimization. " + ], + "image_footnote": [], + "bbox": [ + 267, + 99, + 728, + 449 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 547, + 825, + 699 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "B DETAILS ON THE NUMERICAL EXPERIMENTS ", + "text_level": 1, + "bbox": [ + 173, + 719, + 580, + 734 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "B.1 VERIFICATION ON GROUND-TRUTH DATA ", + "text_level": 1, + "bbox": [ + 174, + 750, + 508, + 763 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "We first evaluated TVAE training on artificial datasets with known ground-truth parameters and loglikelihood, in order to verify the correct functioning of the algorithm and to investigate possible local optima effects. The dataset consisted of $5 0 0 4 \\mathrm { x } 4$ images generated by linear superposition of vertical and horizontal bars, with a small amount of Gaussian noise. The DNN’s input and middle layers had 8 units each. The $\\Phi ^ { ( n ) }$ variational sets consisted of 64 hidden states each. Fig. 7 shows the evolution of the run that achieved the highest ELBO value out of ten. All parameters were correctly recovered, and the ELBO value was consistent with actual ground-truth log-likelihood. ", + "bbox": [ + 174, + 775, + 825, + 875 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Such a simple test, however, can also be solved by linear models. In order to demonstrate that TVAEs can solve non-linear problems, taking advantage of the neural network non-linearity embedded in the generative model, we introduced correlations between pairs of bars: the bars combinations shown in the first two datapoints from the left in Fig. 8 were discouraged from appearing together. We employed the same evolutionary scheme and again we selected the run with highest peak ELBO value out of ten. The model correctly learns that certain combinations of bars are much more unlikely than others, and correctly estimates their likelihood. ", + "bbox": [ + 176, + 882, + 823, + 924 + ], + "page_idx": 14 + }, + { + "type": "image", + "img_path": "images/2a6b04221e9ae44435f5a6d9105878e4322c3702f6543e98f05d8e32a9dce63d.jpg", + "image_caption": [ + "Figure 7: TVAE training on simple bars data: noiseless output of the TVAE’s DNN for the 8 possible one-hot input vectors over several training epochs. Generating parameters are in the last row. " + ], + "image_footnote": [], + "bbox": [ + 392, + 104, + 611, + 199 + ], + "page_idx": 15 + }, + { + "type": "image", + "img_path": "images/18ac5c6b9ab26009afa724c2a4f8213b294d061feb31af9d3055cb0d8f1edbce.jpg", + "image_caption": [ + "Figure 8: Correlated bars test. The plot shows the ratio between inferred and ground-truth loglikelihoods $\\log p _ { \\Theta } ( \\vec { x } )$ of datapoints with interesting bar combinations. The inferred values are reported below the datapoints themselves. " + ], + "image_footnote": [], + "bbox": [ + 320, + 272, + 678, + 377 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "", + "bbox": [ + 173, + 473, + 825, + 530 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "Fig. 9 offers some more insight into the correlated bars test experiment described. The left section of the figure shows the generative parameters for the dataset used: $W _ { 0 }$ is the $8 \\mathrm { x } 8$ weight matrix of the top-to-middle layer: this makes it so that the activation of the first latent variable inhibits activation of the second, and activation of the last latent variable inhibits activation of the last. Concretely, this results in a dataset where these specific bars combinations are discouraged from appearing. The weights $W _ { 1 }$ , visualized as $8 4 \\mathrm { x } 4$ matrices, generate the actual bars. $\\sigma ^ { 2 }$ was set to 0.01 and the dataset contained an average of two superimposing bars per datapoint $\\pi _ { h } = 2 / 8$ for each $h$ ). ", + "bbox": [ + 173, + 537, + 825, + 636 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "The middle section of the figure shows the ELBO values (averages over all batches for each epoch) as training progresses. The cyclic learning rate schedule is responsible for the oscillatory behavior. ", + "bbox": [ + 173, + 641, + 823, + 670 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "The right section shows some example datapoints together with samples from the trained TVAE model that reached the highest ELBO value out of the ten runs. ", + "bbox": [ + 171, + 676, + 823, + 705 + ], + "page_idx": 15 + }, + { + "type": "image", + "img_path": "images/dc0cbe1af3b8b15e73702eaecae44249051888aa76aa16c38dc8063e30376cb5.jpg", + "image_caption": [ + "Figure 9: From left to right: generative parameters for the correlated bars test; ELBO values over epochs for 10 runs; example datapoints and samples from the generative model. " + ], + "image_footnote": [], + "bbox": [ + 210, + 729, + 792, + 858 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "B.2 DENOISING ", + "text_level": 1, + "bbox": [ + 174, + 103, + 299, + 118 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Given a trained TVAE with parameters $\\Theta$ , we estimated the value of a pixel in a single patch as $x _ { d } ^ { \\mathrm { e s t } } = \\langle x _ { d } \\rangle _ { p \\Theta ( x _ { d } | \\vec { x } ) }$ . When using $\\begin{array} { r } { p _ { \\Theta } ( x _ { d } \\mid \\vec { x } ) = \\sum _ { \\{ \\vec { z } \\} } p _ { \\Theta } ( x _ { d } \\mid \\vec { z } ) p _ { \\Theta } ( \\vec { z } \\mid \\vec { x } ) } \\end{array}$ we obtain: ", + "bbox": [ + 174, + 128, + 825, + 161 + ], + "page_idx": 16 + }, + { + "type": "equation", + "img_path": "images/bc3ae83dbff8bede298f7bfe73f865f1edc26b6a4b41f5b08b13b602ed7d9df4.jpg", + "text": "$$\nx _ { d } ^ { \\mathrm { e s t } } = \\Big \\langle \\langle x _ { d } \\rangle _ { p _ { \\Theta } ( x _ { d } | \\vec { z } ) } \\Big \\rangle _ { p _ { \\Theta } ( \\vec { z } | \\vec { x } ) } = \\langle \\mu _ { d } ( \\vec { z } ) \\rangle _ { p _ { \\Theta } ( \\vec { z } | \\vec { x } ) } .\n$$", + "text_format": "latex", + "bbox": [ + 338, + 167, + 660, + 198 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "The expectation value on the right-hand-side of Eqn. (15) is then approximated based on the encoding parameters $\\boldsymbol { \\Phi } ^ { ( n ) }$ using truncated posteriors. Finally, we took a weighted average of the estimates of a pixel value in different patches (see, e.g., Burger et al., 2012) in order to generate the pixel values of the full denoised image. ", + "bbox": [ + 174, + 204, + 825, + 263 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "In Tab. 3 we list the exact hyper-parameters used to obtain the PSNR values reported. In parentheses, the parameters for the run on data with noise level $\\sigma = 5 0$ and unconstrained hyper-parameters are given, when they differ from the other experiments. ", + "bbox": [ + 174, + 270, + 825, + 313 + ], + "page_idx": 16 + }, + { + "type": "table", + "img_path": "images/e7e2392040c03770e2a9249a8eafb5b87fdc864c763b65e3553313e58078db78.jpg", + "table_caption": [ + "Table 3: Hyper-parameters for the denoising experiments on the house image. " + ], + "table_footnote": [], + "table_body": "
Neural network units Input (H) 64 (512) Middle 64 (512)
Output (D) 64 (144) Cyclic Learning Rates
Min 1.r. 0.0001
Max l.r. 0.01 (0.05)
Epochs/cycle 20 Batch size 32
Evolutionaryparameters
Parents 10 (5) Children 9 (4) Generations 4(1)
", + "bbox": [ + 178, + 386, + 367, + 585 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Table 4: Denoising performance of $\\mathbf { n } 2 \\mathbf { v }$ in PSNR (dB) for the ‘house’ image with AWG noise. For comparison, we additionally list the performance of TVAE (numbers copied from Tab. 2). PSNR values for $\\mathrm { n } 2 \\mathrm { v } ^ { \\star }$ are obtained by training only on the noisy image (i.e., in the same setting as used for MTMKL, GSC, var-BSC and TVAE in Tab. 2. More training data improves performance for $\\mathbf { n } 2 \\mathbf { v } .$ . PSNR values for $\\mathrm { n } 2 \\mathrm { \\bar { v } } ^ { \\dagger }$ show performance if additional training data in the form of noisy images with AWG noise $\\sigma = 2 5$ is used. Further improvements (especially for high noise) are obtained if the $\\mathrm { n } 2 \\mathrm { v }$ network is trained on training data with a noise level that matches the noise of the test set $\\mathrm { ( s e e \\ n 2 v ^ { \\ddagger } ) }$ ). For instance, we used for $\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }$ training data with $\\sigma = 5 0$ to denoise the ‘house’ with $\\sigma = 5 0$ . See text for further details. ", + "bbox": [ + 433, + 337, + 823, + 531 + ], + "page_idx": 16 + }, + { + "type": "table", + "img_path": "images/c425fd391cd8fc944e87795092b57c8aac91610ed44014a53c090355e4f0675d.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
0=15g=25q=50
n2v*32.0529.2025.42
n2vt32.9332.1020.96
n2vt33.9132.1028.94
TVAE34.27 ± .0232.65 ± .0629.98 ± .05
", + "bbox": [ + 464, + 535, + 794, + 617 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "To evaluate the performance on standard denoising benchmarks, we first compared TVAE to related probabilistic sparse coding approaches such as MTMKL, GSC and var-BSC (Tab. 1). MTMKL and GSC use the data model of spike-and-slab sparse coding and for training mean-field and truncated posterior approximations with pre-selection are used, respectively. Compared to MTMKL and GSC, var-BSC uses a less complex data model and a training scheme also based on evolutionary optimization (Guiraud et al., 2018). The denoising performance observed in the scenario with controlled conditions (Tab. 1) shows that for high noise level $( \\sigma = 5 0 $ ), var-BSC achieves higher PSNR values than MTMKL and GSC although the method uses a simpler data model. This observation demonstrates the effectiveness of the evolutionary training method used by var-BSC. However, PSNR values for TVAE are significantly higher due to the higher flexibility in modeling the data distribution provided by the used DNN. ", + "bbox": [ + 173, + 631, + 825, + 784 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "In a second step, Tab. 2 compared the performance of TVAE with respect to different denoising approaches including deterministic sparse coding (KSVD), a mixture model approach (EPLL), a non-local image processing method (WNNM) and state-of-the-art denoising methods based on deep neural networks (BDGAN and DPDNN). These approaches can be distinguished, e.g., by the amount of employed training data and by the requirement for clean data. ", + "bbox": [ + 174, + 790, + 825, + 861 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "TVAE as well as MTMKL, GSC and var-BSC do not require clean images for training. Furthermore, all these approaches can be trained if only the single noisy image is available (‘zero-shot’ learning; compare, e.g., Shocher et al., 2018; Imamura et al., 2019). Instead, EPLL, BDGAN and DPDNN use clean training data (typically tens or hundreds of thousands of data points are collected for training). ", + "bbox": [ + 174, + 867, + 823, + 924 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "Approaches such as noise2noise $\\mathtt { n 2 n }$ Lehtinen et al., 2018) and noise2void (n2v Krull et al., 2019) occupy a middle ground: they can be trained on noisy data but they typically require much larger amounts of data than, e.g., TVAE or MTMKL. In the original n2v publication, for instance, 400 (noisy) $1 8 0 \\times 1 8 0$ BSD (Martin et al., 2001) images were used to create a training dataset (this procedure also involved data augmentation; compare Krull et al. 2019). For our comparison with results of Tab. 2, we used the standard, publicly available code for $\\mathbf { n } 2 \\mathbf { v }$ together with the default training set $\\sigma = 2 5$ ) employed in the original n2v publication. We then applied the trained $\\mathbf { n } 2 \\mathbf { v }$ network to denoise the ‘house’ image with $\\sigma = 2 5$ . The resulting PSNR value was $3 2 . 1 0 d B$ which is $0 . 7 6 d B$ lower than the PSNR value for BM3D $( 3 2 . 8 6 d B )$ . The difference is consistent with an on average $0 . 8 8 d B$ lower performance of $\\mathbf { n } 2 \\mathbf { v }$ compared to BM3D on the BSD68 test set (see Krull et al., 2019). The same network can also be used to denoise an image with lower or higher noise level. The $\\mathbf { n } 2 \\mathbf { v }$ network trained on $\\sigma = 2 5$ does, for instance, result in PSNR values of $3 2 . 9 3 d B$ for the ‘house’ image with $\\sigma = 1 5$ and in $2 0 . 9 6 d B$ for the ‘house’ image with $\\sigma = 5 0$ (see $n 2 v ^ { \\dagger }$ in Tab. 4). Especially for high noise levels performance can be much improved, however, if the n2v network is trained using images with the same noise level as the test image. In order to do so, we followed the procedure described in the $\\mathbf { n } 2 \\mathbf { v }$ publication while adapting the noise level of $\\sigma = 1 5$ in one case and $\\sigma = 5 0$ for the other case. Trained on a dataset with matched noise, we then denoised the ‘house’ image with $\\sigma = 1 5$ in the one, and $\\sigma = 5 0$ in the other case (results listed as $\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }$ in Tab. 4). The PSNR values obtained for ‘house’ in this matched-noise-level scenario are much higher compared to the scenario with unmatched noise level (e.g., for $\\sigma = 5 0$ the PSNR improvement is approximately 8 dB). The much lower performance for mismatched noise for $\\mathbf { n } 2 \\mathbf { v }$ is in this respect consistent with observations for standard DNN denoising for which training with the ground-truth noise level has been pointed out as important for performance (Chaudhury & Roy, 2017; Zhang et al., 2018). ", + "bbox": [ + 173, + 103, + 825, + 435 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "The $\\mathrm { n } 2 \\mathrm { v }$ approach can avoid having to know the exact noise level, e.g., if it is trained on just the single noisy image. In a last experiment, we hence investigated this ‘zero-shot’ denoising feature of n2v and applied the algorithm to denoise the ‘house’ image while using the same noisy image for training that we seek to denoise (we took the publicly available code of $\\mathrm { n } 2 \\mathrm { v }$ as an example and manually adjusted hyperparameters as follows: we set the ”Percentage of pixel to manipulate per patch” to a value of 0.4, as ”Number of training epochs” we used 400 and we set the ”Number of parameter update steps per epoch” to 33). The obtained PSNR values are listed as $\\mathrm { n } 2 \\mathrm { v } ^ { \\ast }$ in Tab. 4. ", + "bbox": [ + 174, + 443, + 825, + 541 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "From Tab. 4 it can be observed, that for all considered training settings of $\\mathrm { n } 2 \\mathrm { v }$ and all noise levels, PSNR values of TVAE are consistently higher than those of $\\mathbf { n } 2 \\mathbf { v }$ even if $\\mathrm { n } 2 \\mathrm { v }$ is trained on external data with matched-noise level. Additional parameter tuning may improve performance of $\\mathrm { n } 2 \\mathrm { v } ^ { \\ast }$ to a certain extent but PSNRs are in general much lower than $\\mathrm { \\hat { n } } 2 \\mathrm { v } ^ { \\ddag }$ . While we followed for $\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }$ the standard hyperparameter setting of the original paper/code publication of $\\mathbf { n } 2 \\mathbf { v }$ (Krull et al., 2019), we cannot exclude further improvements with parameter fine tuning for the ‘house’ benchmark. However, we remark that the difference of $\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }$ and BM3D for the ‘house’ benchmark is on the very same range as the differences between n2v and BM3D as reported on the BSD data set in the original n2v publication. The stronger performing BM3D is according to denoising performance the preferable comparison and as such included in Tab. 2. In terms of efficiency, the $\\mathrm { n } 2 \\mathrm { v }$ approach is in general (once trained) faster than BM3D as well as TVAE, however. ", + "bbox": [ + 174, + 547, + 825, + 700 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "PSNR values of noise2noise $( \\mathtt { n 2 n } )$ are usually very closely aligned with PSNR values achievable by feed-forward DNNs. More concretely, $\\mathfrak { n } 2 \\mathfrak { n }$ uses, for instance, a RED30 network (Mao et al., 2016) which achieves 31.07 dB PSNR on the BSD300 data set if trained on clean data. If directly trained on noisy data, RED30 achieves 31.06 dB (Lehtinen et al., 2018). n2n is thus strongly performing in terms of PSNR. The caveat of n2n compared to n2v is, however, that the noisy data n2n uses is rather artificial. The pairs of images n2n is trained on consist of two different noise realization of the same underlying clean image. For real data, such a setting is only approximately occurring at most, which has motivated the n2v approach. ", + "bbox": [ + 174, + 707, + 825, + 819 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Like n2v, BDGAN and DPDNN are optimized for specific noise levels (specific standard deviations are used to generate the noisy training examples). EPLL is trained exclusively on clean image patches; for denoising, the algorithm requires the ground-truth noise level of the test image as input parameter. Ground-truth noise level information is also required by KSVD and WNNM. ", + "bbox": [ + 174, + 825, + 823, + 882 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "Like all approaches in the top category of Tab. 2, TVAE does not require ground-truth noise level information, nor clean images, nor large amounts of training data. For the ‘zero-shot’ setting, TVAE is consequently the best performing system on the ‘house’ benchmark. Such a high performance is notably achieved using a basic DNN and relatively small patch sizes of $D = 8 \\times 8$ (for $\\sigma = 1 5$ and $\\sigma = 2 5$ ) or $D = 1 2 \\times 1 2$ (for $\\sigma = 5 0$ ). All feed-forward DNNs for denoising use much larger patches (e.g., n2v use $6 4 \\times 6 4$ ). That a competitive denoising performance can be achieved for small patches, in general, argues in favor for VAE approaches to denoising. Indeed, TVAE even comes close to state-of-the-art approaches (BDGAN and DPDNN) that use very intricate DNN architectures and large amounts of clean training data. We believe that such results underline the potential of the here investigated approach although the novelty of the approach is the focus rather than extensive benchmarking. ", + "bbox": [ + 174, + 888, + 823, + 916 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 825, + 229 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "On the other hand, an important limitation of TVAE is its computational demand. For our experiments on the ‘house’ image with noise level $\\sigma = 5 0$ in Tab. 2 we used $N = 6 0 0 2 5$ patches of $D = 1 2 \\times 1 2$ pixels, which amounts to all possible non-overlapping square patches of that size that can be extracted from the image. For training and denoising we used a TVAE with $H = 5 1 2$ latent variables, sizes of $| { \\Phi } ^ { ( n ) } | = 6 4 $ , and 512 units in the DNN middle layer of the decoder. TVAE training required 49 seconds per training epoch when executing on a single NVIDIA Titan $\\mathrm { X p }$ GPU and $2 . 5 \\mathrm { G B }$ of GPU memory. We ran for 500 epochs which required between seven and eight hours on the single GPU. We did not observe significant changes in variational bound values or in denoising performance after 500 epochs in any of the experiments we conducted for Tabs 1 and 2. Runtime complexity increased linear with the number of data points $N$ , with the dimensionality of the data $D$ , with the number of the latents $H$ , and with the size of the DNN used. Runtimes also increased approximately proportional w.r.t. the size of $\\boldsymbol { \\Phi } ^ { ( n ) }$ . Empirically we observed a sublinear scaling with |Φ(n) | presumably because of significant overhead computations: for example, increasing from $| { \\boldsymbol { \\Phi } } ^ { ( n ) } | = 6 4$ to $| { \\Phi } ^ { ( n ) } | = 1 2 8$ (while keeping all other parameters as above) computational time increases from 49 seconds per training epoch to 75 seconds. ", + "bbox": [ + 173, + 236, + 825, + 457 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "For noise levels $\\sigma = 1 5$ and $\\sigma = 2 5$ in Tab. 2 we used smaller patch sizes $( D = 8 \\times 8 )$ ) and fewer stochastic latents $H = 6 4$ ) but larger $\\boldsymbol { \\Phi } ^ { ( n ) }$ (i.e., $| { \\Phi } ^ { ( n ) } | = 2 0 \\bar { 0 } )$ . In general, if the patch size $D$ is increased, more structure has to be captured. This can be done either by increasing the size of the stochastic latents $H$ or by using larger DNNs. Both, in turn, requires more training data in order to estimate the increased number of parameters. In the current setup, the sizes of $D$ which are currently feasible are comparably small. The denoising performance based on small patches is, however, notably very high. ", + "bbox": [ + 174, + 463, + 825, + 564 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "For comparison, n2v uses up to $D = 6 4 \\times 6 4$ and also all other feed-forward DNN approaches use significantly larger patch sizes than TVAE (and the other approaches in category 1). Still, n2v can be trained efficiently on large patches requiring approximately 19 hours on a NVIDIA Tesla K80 GPU for training on approximately $3 \\mathrm { k }$ noisy images of shape $1 8 0 \\mathrm { x } 1 8 0$ and seconds for the denoising of one 256x256 image. The higher computational demand of TVAE is also the reason why averaging across databases with many images (such as BSD68) or applications to large single images quickly becomes infeasible. As a novel approach, TVAE is, however, far from being fully optimized algorithmically compared to large feed-forward approaches, and there is certainly further potential to improve training efficiency. ", + "bbox": [ + 173, + 570, + 825, + 696 + ], + "page_idx": 18 + }, + { + "type": "text", + "text": "While denoising is, in general, well suited for deep generative models, performance for standard image denoising is by far not as common as such results for standard DNNs (which may also be related to efficiency aspects). An exception is a recent GAN approach (BDGAN; Zhu et al., 2019). VAEs are often evaluated using binarized MNIST with approximate log-likelihoods for comparison; that benchmark, however, is not consistent with the Gaussian noise model used here and does not allow a direct comparison with feed-forward DNNs which are the state-of-the-art. ", + "bbox": [ + 174, + 703, + 825, + 786 + ], + "page_idx": 18 + } +] \ No newline at end of file diff --git a/parse/train/P42rXLGZQ07/P42rXLGZQ07_middle.json b/parse/train/P42rXLGZQ07/P42rXLGZQ07_middle.json new file mode 100644 index 0000000000000000000000000000000000000000..17c7be389bb9f7e8b4f40e0e1637830a48d60862 --- /dev/null +++ b/parse/train/P42rXLGZQ07/P42rXLGZQ07_middle.json @@ -0,0 +1,57234 @@ +{ + "pdf_info": [ + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 79, + 514, + 116 + ], + "lines": [ + { + "bbox": [ + 106, + 78, + 428, + 97 + ], + "spans": [ + { + "bbox": [ + 106, + 78, + 428, + 97 + ], + "score": 1.0, + "content": "DIRECT EVOLUTIONARY OPTIMIZATION OF", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 99, + 514, + 117 + ], + "spans": [ + { + "bbox": [ + 107, + 99, + 514, + 117 + ], + "score": 1.0, + "content": "VARIATIONAL AUTOENCODERS WITH BINARY LATENTS", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 112, + 136, + 244, + 157 + ], + "lines": [ + { + "bbox": [ + 113, + 136, + 201, + 147 + ], + "spans": [ + { + "bbox": [ + 113, + 136, + 201, + 147 + ], + "score": 1.0, + "content": "Anonymous authors", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 112, + 146, + 245, + 159 + ], + "spans": [ + { + "bbox": [ + 112, + 146, + 245, + 159 + ], + "score": 1.0, + "content": "Paper under double-blind review", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5 + }, + { + "type": "title", + "bbox": [ + 278, + 187, + 333, + 199 + ], + "lines": [ + { + "bbox": [ + 276, + 186, + 335, + 200 + ], + "spans": [ + { + "bbox": [ + 276, + 186, + 335, + 200 + ], + "score": 1.0, + "content": "ABSTRACT", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + }, + { + "type": "text", + "bbox": [ + 143, + 216, + 468, + 510 + ], + "lines": [ + { + "bbox": [ + 141, + 214, + 469, + 227 + ], + "spans": [ + { + "bbox": [ + 141, + 214, + 469, + 227 + ], + "score": 1.0, + "content": "Discrete latent variables are considered important to model the generation process", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 142, + 226, + 469, + 237 + ], + "spans": [ + { + "bbox": [ + 142, + 226, + 469, + 237 + ], + "score": 1.0, + "content": "of real world data, which has motivated research on Variational Autoencoders", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 142, + 237, + 469, + 249 + ], + "spans": [ + { + "bbox": [ + 142, + 237, + 469, + 249 + ], + "score": 1.0, + "content": "(VAEs) with discrete latents. However, standard VAE training is not possible", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 141, + 248, + 469, + 259 + ], + "spans": [ + { + "bbox": [ + 141, + 248, + 469, + 259 + ], + "score": 1.0, + "content": "in this case, which has motivated different strategies to manipulate discrete dis-", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 142, + 259, + 469, + 270 + ], + "spans": [ + { + "bbox": [ + 142, + 259, + 469, + 270 + ], + "score": 1.0, + "content": "tributions in order to train discrete VAEs similarly to conventional ones. Here", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 142, + 270, + 469, + 281 + ], + "spans": [ + { + "bbox": [ + 142, + 270, + 469, + 281 + ], + "score": 1.0, + "content": "we ask if it is also possible to keep the discrete nature of the latents fully intact", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 141, + 281, + 469, + 292 + ], + "spans": [ + { + "bbox": [ + 141, + 281, + 469, + 292 + ], + "score": 1.0, + "content": "by applying a direct discrete optimization for the encoding model. The studied", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 141, + 291, + 469, + 304 + ], + "spans": [ + { + "bbox": [ + 141, + 291, + 469, + 304 + ], + "score": 1.0, + "content": "approach is consequently strongly diverting from standard VAE training by al-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 141, + 301, + 470, + 316 + ], + "spans": [ + { + "bbox": [ + 141, + 301, + 470, + 316 + ], + "score": 1.0, + "content": "together sidestepping absolute standard VAE mechanisms such as sampling ap-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 141, + 313, + 470, + 326 + ], + "spans": [ + { + "bbox": [ + 141, + 313, + 470, + 326 + ], + "score": 1.0, + "content": "proximation, reparameterization trick and amortization. Discrete optimization is", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 141, + 325, + 469, + 336 + ], + "spans": [ + { + "bbox": [ + 141, + 325, + 469, + 336 + ], + "score": 1.0, + "content": "realized in a variational setting using truncated posteriors in conjunction with evo-", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 141, + 334, + 469, + 348 + ], + "spans": [ + { + "bbox": [ + 141, + 334, + 469, + 348 + ], + "score": 1.0, + "content": "lutionary algorithms (using a recently suggested approach). For VAEs with binary", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 142, + 347, + 469, + 357 + ], + "spans": [ + { + "bbox": [ + 142, + 347, + 469, + 357 + ], + "score": 1.0, + "content": "latents, we first show how such a discrete variational method (A) ties into gradient", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 142, + 358, + 469, + 369 + ], + "spans": [ + { + "bbox": [ + 142, + 358, + 469, + 369 + ], + "score": 1.0, + "content": "ascent for network weights and (B) uses the decoder network to select latent states", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 142, + 369, + 469, + 380 + ], + "spans": [ + { + "bbox": [ + 142, + 369, + 469, + 380 + ], + "score": 1.0, + "content": "for training. More conventional amortized training is, as may be expected, more", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 141, + 379, + 469, + 392 + ], + "spans": [ + { + "bbox": [ + 141, + 379, + 469, + 392 + ], + "score": 1.0, + "content": "efficient than direct discrete optimization, and applicable to large neural networks.", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 142, + 391, + 469, + 401 + ], + "spans": [ + { + "bbox": [ + 142, + 391, + 469, + 401 + ], + "score": 1.0, + "content": "However, we here find direct optimization to be efficiently scalable to hundreds of", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 142, + 401, + 469, + 413 + ], + "spans": [ + { + "bbox": [ + 142, + 401, + 469, + 413 + ], + "score": 1.0, + "content": "latent variables using smaller networks. More importantly, we find the effective-", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 141, + 412, + 469, + 424 + ], + "spans": [ + { + "bbox": [ + 141, + 412, + 469, + 424 + ], + "score": 1.0, + "content": "ness of direct optimization to be highly competitive in ‘zero-shot’ learning (where", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 141, + 423, + 470, + 435 + ], + "spans": [ + { + "bbox": [ + 141, + 423, + 470, + 435 + ], + "score": 1.0, + "content": "high effectiveness for small networks is required). In contrast to large supervised", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 433, + 469, + 447 + ], + "spans": [ + { + "bbox": [ + 141, + 433, + 469, + 447 + ], + "score": 1.0, + "content": "neural networks, the here investigated VAEs can, e.g., denoise a single image", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 444, + 469, + 457 + ], + "spans": [ + { + "bbox": [ + 141, + 444, + 469, + 457 + ], + "score": 1.0, + "content": "without previous training on clean data and/or training on large image datasets.", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 141, + 456, + 469, + 469 + ], + "spans": [ + { + "bbox": [ + 141, + 456, + 469, + 469 + ], + "score": 1.0, + "content": "More generally, the studied approach shows that training of VAEs is indeed possi-", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 141, + 466, + 470, + 480 + ], + "spans": [ + { + "bbox": [ + 141, + 466, + 470, + 480 + ], + "score": 1.0, + "content": "ble without sampling-based approximation and reparameterization, which may be", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 141, + 478, + 469, + 490 + ], + "spans": [ + { + "bbox": [ + 141, + 478, + 469, + 490 + ], + "score": 1.0, + "content": "interesting for the analysis of VAE-training in general. In the regime of few data,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 142, + 489, + 469, + 501 + ], + "spans": [ + { + "bbox": [ + 142, + 489, + 469, + 501 + ], + "score": 1.0, + "content": "direct optimization, furthermore, makes VAEs competitive for denoising where", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 142, + 500, + 429, + 511 + ], + "spans": [ + { + "bbox": [ + 142, + 500, + 429, + 511 + ], + "score": 1.0, + "content": "they have previously been outperformed by non-generative approaches.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 18 + }, + { + "type": "title", + "bbox": [ + 108, + 539, + 320, + 552 + ], + "lines": [ + { + "bbox": [ + 105, + 538, + 321, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 538, + 321, + 554 + ], + "score": 1.0, + "content": "1 INTRODUCTION AND RELATED WORK", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 32 + }, + { + "type": "text", + "bbox": [ + 107, + 567, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 565, + 505, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 505, + 581 + ], + "score": 1.0, + "content": "Variational autoencoders (Kingma & Welling, 2014; Rezende et al., 2014) are prominent and very", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 578, + 505, + 591 + ], + "spans": [ + { + "bbox": [ + 105, + 578, + 505, + 591 + ], + "score": 1.0, + "content": "actively researched models for unsupervised learning. VAEs, in their many different variations,", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 104, + 587, + 505, + 603 + ], + "spans": [ + { + "bbox": [ + 104, + 587, + 505, + 603 + ], + "score": 1.0, + "content": "have successfully been applied to a large number of tasks including semi-supervised learning (e.g.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 600, + 505, + 613 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 505, + 613 + ], + "score": 1.0, + "content": "Maaløe et al., 2016), anomaly detection (e.g. An & Cho, 2015; Kiran et al., 2018), sentence in-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "score": 1.0, + "content": "terpolation (Bowman et al., 2016), music interpolation (Roberts et al., 2018) and drug response", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 622, + 505, + 634 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 505, + 634 + ], + "score": 1.0, + "content": "prediction (Rampasek et al., 2017). The success of VAEs rests on a series of methods that enable", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "score": 1.0, + "content": "the derivation of scalable training algorithms to optimize their model parameters (discussed further", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 643, + 505, + 657 + ], + "spans": [ + { + "bbox": [ + 105, + 643, + 505, + 657 + ], + "score": 1.0, + "content": "below). A desired feature when applying VAEs to a given problem is that their latent variables (i.e.,", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "the encoder output variables) correspond to meaningful properties of the data, ideally to those latent", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "score": 1.0, + "content": "causes that have originally generated the data. However, many real-world datasets suggest the use", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 676, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 506, + 691 + ], + "score": 1.0, + "content": "of discrete latents as they often describe the data generation process more naturally. For instance,", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 687, + 506, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 702 + ], + "score": 1.0, + "content": "the presence or absence of objects in images is best described by binary latents (e.g. Jojic & Frey,", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "score": 1.0, + "content": "2001). Discrete latents are also a popular choice in modeling sounds; for instance, describing piano", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 104, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 104, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "sounds may naturally involve binary latents: keys are pressed or not (e.g. Titsias & Lazaro-Gredilla, ´", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "2011; Goodfellow et al., 2013; Sheikh et al., 2014). The success of standard forms of VAEs has", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 40 + } + ], + "page_idx": 0, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 307, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 308, + 760 + ], + "lines": [ + { + "bbox": [ + 302, + 751, + 309, + 762 + ], + "spans": [ + { + "bbox": [ + 302, + 751, + 309, + 762 + ], + "score": 1.0, + "content": "1", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 79, + 514, + 116 + ], + "lines": [ + { + "bbox": [ + 106, + 78, + 428, + 97 + ], + "spans": [ + { + "bbox": [ + 106, + 78, + 428, + 97 + ], + "score": 1.0, + "content": "DIRECT EVOLUTIONARY OPTIMIZATION OF", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 107, + 99, + 514, + 117 + ], + "spans": [ + { + "bbox": [ + 107, + 99, + 514, + 117 + ], + "score": 1.0, + "content": "VARIATIONAL AUTOENCODERS WITH BINARY LATENTS", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 112, + 136, + 244, + 157 + ], + "lines": [ + { + "bbox": [ + 113, + 136, + 201, + 147 + ], + "spans": [ + { + "bbox": [ + 113, + 136, + 201, + 147 + ], + "score": 1.0, + "content": "Anonymous authors", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 112, + 146, + 245, + 159 + ], + "spans": [ + { + "bbox": [ + 112, + 146, + 245, + 159 + ], + "score": 1.0, + "content": "Paper under double-blind review", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5, + "bbox_fs": [ + 112, + 136, + 245, + 159 + ] + }, + { + "type": "title", + "bbox": [ + 278, + 187, + 333, + 199 + ], + "lines": [ + { + "bbox": [ + 276, + 186, + 335, + 200 + ], + "spans": [ + { + "bbox": [ + 276, + 186, + 335, + 200 + ], + "score": 1.0, + "content": "ABSTRACT", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4 + }, + { + "type": "text", + "bbox": [ + 143, + 216, + 468, + 510 + ], + "lines": [ + { + "bbox": [ + 141, + 214, + 469, + 227 + ], + "spans": [ + { + "bbox": [ + 141, + 214, + 469, + 227 + ], + "score": 1.0, + "content": "Discrete latent variables are considered important to model the generation process", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 142, + 226, + 469, + 237 + ], + "spans": [ + { + "bbox": [ + 142, + 226, + 469, + 237 + ], + "score": 1.0, + "content": "of real world data, which has motivated research on Variational Autoencoders", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 142, + 237, + 469, + 249 + ], + "spans": [ + { + "bbox": [ + 142, + 237, + 469, + 249 + ], + "score": 1.0, + "content": "(VAEs) with discrete latents. However, standard VAE training is not possible", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 141, + 248, + 469, + 259 + ], + "spans": [ + { + "bbox": [ + 141, + 248, + 469, + 259 + ], + "score": 1.0, + "content": "in this case, which has motivated different strategies to manipulate discrete dis-", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 142, + 259, + 469, + 270 + ], + "spans": [ + { + "bbox": [ + 142, + 259, + 469, + 270 + ], + "score": 1.0, + "content": "tributions in order to train discrete VAEs similarly to conventional ones. Here", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 142, + 270, + 469, + 281 + ], + "spans": [ + { + "bbox": [ + 142, + 270, + 469, + 281 + ], + "score": 1.0, + "content": "we ask if it is also possible to keep the discrete nature of the latents fully intact", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 141, + 281, + 469, + 292 + ], + "spans": [ + { + "bbox": [ + 141, + 281, + 469, + 292 + ], + "score": 1.0, + "content": "by applying a direct discrete optimization for the encoding model. The studied", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 141, + 291, + 469, + 304 + ], + "spans": [ + { + "bbox": [ + 141, + 291, + 469, + 304 + ], + "score": 1.0, + "content": "approach is consequently strongly diverting from standard VAE training by al-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 141, + 301, + 470, + 316 + ], + "spans": [ + { + "bbox": [ + 141, + 301, + 470, + 316 + ], + "score": 1.0, + "content": "together sidestepping absolute standard VAE mechanisms such as sampling ap-", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 141, + 313, + 470, + 326 + ], + "spans": [ + { + "bbox": [ + 141, + 313, + 470, + 326 + ], + "score": 1.0, + "content": "proximation, reparameterization trick and amortization. Discrete optimization is", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 141, + 325, + 469, + 336 + ], + "spans": [ + { + "bbox": [ + 141, + 325, + 469, + 336 + ], + "score": 1.0, + "content": "realized in a variational setting using truncated posteriors in conjunction with evo-", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 141, + 334, + 469, + 348 + ], + "spans": [ + { + "bbox": [ + 141, + 334, + 469, + 348 + ], + "score": 1.0, + "content": "lutionary algorithms (using a recently suggested approach). For VAEs with binary", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 142, + 347, + 469, + 357 + ], + "spans": [ + { + "bbox": [ + 142, + 347, + 469, + 357 + ], + "score": 1.0, + "content": "latents, we first show how such a discrete variational method (A) ties into gradient", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 142, + 358, + 469, + 369 + ], + "spans": [ + { + "bbox": [ + 142, + 358, + 469, + 369 + ], + "score": 1.0, + "content": "ascent for network weights and (B) uses the decoder network to select latent states", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 142, + 369, + 469, + 380 + ], + "spans": [ + { + "bbox": [ + 142, + 369, + 469, + 380 + ], + "score": 1.0, + "content": "for training. More conventional amortized training is, as may be expected, more", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 141, + 379, + 469, + 392 + ], + "spans": [ + { + "bbox": [ + 141, + 379, + 469, + 392 + ], + "score": 1.0, + "content": "efficient than direct discrete optimization, and applicable to large neural networks.", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 142, + 391, + 469, + 401 + ], + "spans": [ + { + "bbox": [ + 142, + 391, + 469, + 401 + ], + "score": 1.0, + "content": "However, we here find direct optimization to be efficiently scalable to hundreds of", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 142, + 401, + 469, + 413 + ], + "spans": [ + { + "bbox": [ + 142, + 401, + 469, + 413 + ], + "score": 1.0, + "content": "latent variables using smaller networks. More importantly, we find the effective-", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 141, + 412, + 469, + 424 + ], + "spans": [ + { + "bbox": [ + 141, + 412, + 469, + 424 + ], + "score": 1.0, + "content": "ness of direct optimization to be highly competitive in ‘zero-shot’ learning (where", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 141, + 423, + 470, + 435 + ], + "spans": [ + { + "bbox": [ + 141, + 423, + 470, + 435 + ], + "score": 1.0, + "content": "high effectiveness for small networks is required). In contrast to large supervised", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 433, + 469, + 447 + ], + "spans": [ + { + "bbox": [ + 141, + 433, + 469, + 447 + ], + "score": 1.0, + "content": "neural networks, the here investigated VAEs can, e.g., denoise a single image", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 444, + 469, + 457 + ], + "spans": [ + { + "bbox": [ + 141, + 444, + 469, + 457 + ], + "score": 1.0, + "content": "without previous training on clean data and/or training on large image datasets.", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 141, + 456, + 469, + 469 + ], + "spans": [ + { + "bbox": [ + 141, + 456, + 469, + 469 + ], + "score": 1.0, + "content": "More generally, the studied approach shows that training of VAEs is indeed possi-", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 141, + 466, + 470, + 480 + ], + "spans": [ + { + "bbox": [ + 141, + 466, + 470, + 480 + ], + "score": 1.0, + "content": "ble without sampling-based approximation and reparameterization, which may be", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 141, + 478, + 469, + 490 + ], + "spans": [ + { + "bbox": [ + 141, + 478, + 469, + 490 + ], + "score": 1.0, + "content": "interesting for the analysis of VAE-training in general. In the regime of few data,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 142, + 489, + 469, + 501 + ], + "spans": [ + { + "bbox": [ + 142, + 489, + 469, + 501 + ], + "score": 1.0, + "content": "direct optimization, furthermore, makes VAEs competitive for denoising where", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 142, + 500, + 429, + 511 + ], + "spans": [ + { + "bbox": [ + 142, + 500, + 429, + 511 + ], + "score": 1.0, + "content": "they have previously been outperformed by non-generative approaches.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 18, + "bbox_fs": [ + 141, + 214, + 470, + 511 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 539, + 320, + 552 + ], + "lines": [ + { + "bbox": [ + 105, + 538, + 321, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 538, + 321, + 554 + ], + "score": 1.0, + "content": "1 INTRODUCTION AND RELATED WORK", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 32 + }, + { + "type": "text", + "bbox": [ + 107, + 567, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 105, + 565, + 505, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 505, + 581 + ], + "score": 1.0, + "content": "Variational autoencoders (Kingma & Welling, 2014; Rezende et al., 2014) are prominent and very", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 578, + 505, + 591 + ], + "spans": [ + { + "bbox": [ + 105, + 578, + 505, + 591 + ], + "score": 1.0, + "content": "actively researched models for unsupervised learning. VAEs, in their many different variations,", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 104, + 587, + 505, + 603 + ], + "spans": [ + { + "bbox": [ + 104, + 587, + 505, + 603 + ], + "score": 1.0, + "content": "have successfully been applied to a large number of tasks including semi-supervised learning (e.g.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 600, + 505, + 613 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 505, + 613 + ], + "score": 1.0, + "content": "Maaløe et al., 2016), anomaly detection (e.g. An & Cho, 2015; Kiran et al., 2018), sentence in-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "score": 1.0, + "content": "terpolation (Bowman et al., 2016), music interpolation (Roberts et al., 2018) and drug response", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 622, + 505, + 634 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 505, + 634 + ], + "score": 1.0, + "content": "prediction (Rampasek et al., 2017). 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A desired feature when applying VAEs to a given problem is that their latent variables (i.e.,", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 505, + 667 + ], + "score": 1.0, + "content": "the encoder output variables) correspond to meaningful properties of the data, ideally to those latent", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 678 + ], + "score": 1.0, + "content": "causes that have originally generated the data. However, many real-world datasets suggest the use", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 676, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 506, + 691 + ], + "score": 1.0, + "content": "of discrete latents as they often describe the data generation process more naturally. For instance,", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 687, + 506, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 702 + ], + "score": 1.0, + "content": "the presence or absence of objects in images is best described by binary latents (e.g. Jojic & Frey,", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 505, + 712 + ], + "score": 1.0, + "content": "2001). Discrete latents are also a popular choice in modeling sounds; for instance, describing piano", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 104, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 104, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "sounds may naturally involve binary latents: keys are pressed or not (e.g. Titsias & Lazaro-Gredilla, ´", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "2011; Goodfellow et al., 2013; Sheikh et al., 2014). The success of standard forms of VAEs has", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 40, + "bbox_fs": [ + 104, + 565, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 82, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "consequently spurred research on novel formulations that feature discrete latents (e.g. Rolfe, 2016;", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 454, + 105 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 454, + 105 + ], + "score": 1.0, + "content": "Khoshaman & Amin, 2018; Roy et al., 2018; Sadeghi et al., 2019; Vahdat et al., 2019).", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 106, + 110, + 505, + 190 + ], + "lines": [ + { + "bbox": [ + 105, + 110, + 505, + 123 + ], + "spans": [ + { + "bbox": [ + 105, + 110, + 505, + 123 + ], + "score": 1.0, + "content": "The objective of VAE training is the optimization of a generative data model which parameterizes", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 122, + 505, + 133 + ], + "spans": [ + { + "bbox": [ + 105, + 122, + 360, + 133 + ], + "score": 1.0, + "content": "a given data distribution. Typically we seek model parameters", + "type": "text" + }, + { + "bbox": [ + 360, + 122, + 369, + 131 + ], + "score": 0.81, + "content": "\\Theta", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 122, + 505, + 133 + ], + "score": 1.0, + "content": "of a VAE that maximize the data", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 104, + 131, + 507, + 147 + ], + "spans": [ + { + "bbox": [ + 104, + 131, + 168, + 147 + ], + "score": 1.0, + "content": "log-likelihood,", + "type": "text" + }, + { + "bbox": [ + 168, + 132, + 285, + 146 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\mathrm { L } ( \\Theta ) = \\sum _ { n } \\log \\left( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } ) \\right) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 131, + 374, + 147 + ], + "score": 1.0, + "content": ", where we denote by", + "type": "text" + }, + { + "bbox": [ + 374, + 132, + 401, + 144 + ], + "score": 0.91, + "content": "\\vec { x } ^ { ( 1 : N ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 131, + 435, + 147 + ], + "score": 1.0, + "content": "a set of", + "type": "text" + }, + { + "bbox": [ + 435, + 133, + 446, + 143 + ], + "score": 0.8, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 131, + 507, + 147 + ], + "score": 1.0, + "content": "observed data", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 146, + 505, + 158 + ], + "spans": [ + { + "bbox": [ + 106, + 146, + 182, + 158 + ], + "score": 1.0, + "content": "points, and where", + "type": "text" + }, + { + "bbox": [ + 183, + 146, + 209, + 157 + ], + "score": 0.9, + "content": "p _ { \\Theta } ( \\vec { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 146, + 505, + 158 + ], + "score": 1.0, + "content": "denotes the modeled data distribution. Like conventional autoencoders", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 156, + 506, + 169 + ], + "spans": [ + { + "bbox": [ + 105, + 156, + 506, + 169 + ], + "score": 1.0, + "content": "(e.g., Bengio et al., 2007), VAEs use a deep neural network (DNN) to generate (or decode) observ-", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 167, + 504, + 180 + ], + "spans": [ + { + "bbox": [ + 105, + 167, + 129, + 180 + ], + "score": 1.0, + "content": "ables", + "type": "text" + }, + { + "bbox": [ + 130, + 167, + 137, + 177 + ], + "score": 0.81, + "content": "\\vec { x }", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 167, + 214, + 180 + ], + "score": 1.0, + "content": "from a latent code", + "type": "text" + }, + { + "bbox": [ + 214, + 168, + 221, + 177 + ], + "score": 0.74, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 221, + 167, + 497, + 180 + ], + "score": 1.0, + "content": ". Unlike conventional autoencoders, however, the generation of data", + "type": "text" + }, + { + "bbox": [ + 497, + 168, + 504, + 177 + ], + "score": 0.81, + "content": "\\vec { x }", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 179, + 411, + 190 + ], + "spans": [ + { + "bbox": [ + 106, + 179, + 411, + 190 + ], + "score": 1.0, + "content": "is not deterministic but it takes the form of a probabilistic generative model.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 5 + }, + { + "type": "text", + "bbox": [ + 108, + 195, + 505, + 217 + ], + "lines": [ + { + "bbox": [ + 105, + 193, + 506, + 209 + ], + "spans": [ + { + "bbox": [ + 105, + 193, + 506, + 209 + ], + "score": 1.0, + "content": "For VAEs with binary latent variables, as they will be of interest here, we consider the following", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 205, + 201, + 218 + ], + "spans": [ + { + "bbox": [ + 106, + 205, + 201, + 218 + ], + "score": 1.0, + "content": "VAE generative model:", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9.5 + }, + { + "type": "interline_equation", + "bbox": [ + 117, + 223, + 481, + 239 + ], + "lines": [ + { + "bbox": [ + 117, + 223, + 481, + 239 + ], + "spans": [ + { + "bbox": [ + 117, + 223, + 481, + 239 + ], + "score": 0.91, + "content": "\\begin{array} { r } { p _ { \\Theta } ( \\vec { z } ) = \\mathrm { B e r n } ( \\vec { z } ; \\vec { \\pi } ) = \\prod _ { h } \\big ( \\pi _ { h } ^ { z _ { h } } ( 1 - \\pi _ { h } ) ^ { ( 1 - z _ { h } ) } \\big ) , \\qquad p _ { \\Theta } ( \\vec { x } \\mid \\vec { z } ) = \\mathcal { N } \\big ( \\vec { x } ; \\vec { \\mu } ( \\vec { z } ; W ) , \\sigma ^ { 2 } \\mathbb { I } \\big ) , } \\end{array}", + "type": "interline_equation", + "image_path": "f8edc23be805e25f0d5792a4bb55f7f28d732c15601a166dea0c72075c0ffe0f.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 117, + 223, + 481, + 239 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 243, + 505, + 333 + ], + "lines": [ + { + "bbox": [ + 105, + 243, + 505, + 257 + ], + "spans": [ + { + "bbox": [ + 105, + 244, + 134, + 257 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 135, + 243, + 188, + 256 + ], + "score": 0.94, + "content": "\\vec { z } \\in \\{ 0 , 1 \\} ^ { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 244, + 374, + 257 + ], + "score": 1.0, + "content": "is a binary code and the non-linear function", + "type": "text" + }, + { + "bbox": [ + 374, + 244, + 409, + 257 + ], + "score": 0.93, + "content": "\\vec { \\mu } ( \\vec { z } ; W )", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 244, + 505, + 257 + ], + "score": 1.0, + "content": "is a DNN that outputs", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 255, + 505, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 255, + 267, + 268 + ], + "score": 1.0, + "content": "the mean of the Gaussian distribution.", + "type": "text" + }, + { + "bbox": [ + 267, + 255, + 305, + 267 + ], + "score": 0.92, + "content": "p _ { \\Theta } ( \\vec { x } \\vert \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 306, + 255, + 505, + 268 + ], + "score": 1.0, + "content": "is commonly referred to as decoder. The set of", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 266, + 506, + 279 + ], + "spans": [ + { + "bbox": [ + 105, + 266, + 190, + 279 + ], + "score": 1.0, + "content": "model parameters is", + "type": "text" + }, + { + "bbox": [ + 190, + 266, + 256, + 279 + ], + "score": 0.93, + "content": "\\Theta = \\{ \\vec { \\pi } , W , \\sigma ^ { 2 } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 266, + 287, + 279 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 288, + 267, + 299, + 277 + ], + "score": 0.69, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 266, + 506, + 279 + ], + "score": 1.0, + "content": "incorporates DNN weights and biases. We assume", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 277, + 505, + 290 + ], + "spans": [ + { + "bbox": [ + 105, + 277, + 505, + 290 + ], + "score": 1.0, + "content": "homoscedasticity of the Gaussian distribution, but note that there is no obstacle to generalizing the", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 289, + 505, + 301 + ], + "spans": [ + { + "bbox": [ + 106, + 289, + 505, + 301 + ], + "score": 1.0, + "content": "model by inserting a DNN non-linearity that outputs a correlation matrix. Similarly, the algorithm", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 299, + 505, + 312 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 505, + 312 + ], + "score": 1.0, + "content": "could easily be generalized to different noise distributions should the task at hand call for it. For", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 310, + 505, + 323 + ], + "spans": [ + { + "bbox": [ + 105, + 310, + 505, + 323 + ], + "score": 1.0, + "content": "the purpose of this work, however, we will focus on as elementary as possible VAEs, with the form", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 320, + 185, + 334 + ], + "spans": [ + { + "bbox": [ + 105, + 320, + 185, + 334 + ], + "score": 1.0, + "content": "shown in Eqn. (1).", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 15.5 + }, + { + "type": "text", + "bbox": [ + 108, + 338, + 504, + 361 + ], + "lines": [ + { + "bbox": [ + 106, + 338, + 504, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 338, + 504, + 351 + ], + "score": 1.0, + "content": "Given standard or binary-latent VAEs, essentially all learning algorithms seek to approximately", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 349, + 500, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 349, + 500, + 362 + ], + "score": 1.0, + "content": "maximize the log-likelihood using the following series of methods (we elaborate in the appendix):", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20.5 + }, + { + "type": "text", + "bbox": [ + 123, + 367, + 505, + 459 + ], + "lines": [ + { + "bbox": [ + 123, + 367, + 478, + 381 + ], + "spans": [ + { + "bbox": [ + 123, + 367, + 478, + 381 + ], + "score": 1.0, + "content": "(A) Instead of the log-likelihood, a variational lower-bound (a.k.a. ELBO) is optimized.", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 124, + 379, + 505, + 393 + ], + "spans": [ + { + "bbox": [ + 124, + 379, + 505, + 393 + ], + "score": 1.0, + "content": "(B) VAE posteriors are approximated by an encoding model, that is a specific distribution (often", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 141, + 390, + 338, + 404 + ], + "spans": [ + { + "bbox": [ + 141, + 390, + 338, + 404 + ], + "score": 1.0, + "content": "Gaussian) parameterized by one or more DNNs.", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 124, + 402, + 505, + 416 + ], + "spans": [ + { + "bbox": [ + 124, + 403, + 140, + 415 + ], + "score": 1.0, + "content": "(C)", + "type": "text" + }, + { + "bbox": [ + 141, + 402, + 505, + 416 + ], + "score": 1.0, + "content": "The variational parameters of the encoder are optimized using gradient ascent on the lower", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 414, + 505, + 427 + ], + "spans": [ + { + "bbox": [ + 141, + 414, + 505, + 427 + ], + "score": 1.0, + "content": "bound, where the gradient is evaluated based on sampling and reparameterization trick to", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 141, + 423, + 436, + 438 + ], + "spans": [ + { + "bbox": [ + 141, + 423, + 436, + 438 + ], + "score": 1.0, + "content": "obtain sufficiently low-variance and yet efficiently computable estimates.", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 124, + 436, + 505, + 450 + ], + "spans": [ + { + "bbox": [ + 124, + 436, + 505, + 450 + ], + "score": 1.0, + "content": "(D) Using samples from the encoder, the parameters of the decoder are optimized using gradient", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 141, + 448, + 296, + 459 + ], + "spans": [ + { + "bbox": [ + 141, + 448, + 296, + 459 + ], + "score": 1.0, + "content": "ascent on the variational lower bound.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 25.5 + }, + { + "type": "text", + "bbox": [ + 106, + 462, + 505, + 660 + ], + "lines": [ + { + "bbox": [ + 106, + 462, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 106, + 462, + 505, + 475 + ], + "score": 1.0, + "content": "Optimization procedures for VAEs with discrete latents follow the same steps (Points A to D). How-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 474, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 106, + 474, + 505, + 486 + ], + "score": 1.0, + "content": "ever, discrete or binary latents pose substantial further obstacles in learning, mainly due to the fact", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "that backpropagation through discrete variables is generally not possible (Rolfe, 2016; Bengio et al.,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 495, + 505, + 508 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 505, + 508 + ], + "score": 1.0, + "content": "2013). In order to maintain the general VAE framework for encoder optimization, different groups", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "score": 1.0, + "content": "have therefore suggested different possible solutions: work by Rolfe (2016), for instance, extends", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 516, + 505, + 530 + ], + "spans": [ + { + "bbox": [ + 105, + 516, + 505, + 530 + ], + "score": 1.0, + "content": "VAEs with discrete latents by auxiliary continuous latents such that gradients can still be computed.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 526, + 506, + 542 + ], + "spans": [ + { + "bbox": [ + 105, + 526, + 506, + 542 + ], + "score": 1.0, + "content": "Work on the concrete distribution (Maddison et al., 2016) or Gumbel-softmax distribution (Jang", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 539, + 506, + 552 + ], + "spans": [ + { + "bbox": [ + 105, + 539, + 506, + 552 + ], + "score": 1.0, + "content": "et al., 2016) proposes newly defined continuous distributions that contain discrete distributions as", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "score": 1.0, + "content": "limit cases. Work by Lorberbom et al. (2019) merges the Gumbel-Max reparameterization with the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "score": 1.0, + "content": "use of direct loss minimization for gradient estimation, enabling efficient training on structured la-", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 572, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 505, + 584 + ], + "score": 1.0, + "content": "tent spaces. Finally, work by van den Oord et al. (2017), and Roy et al. (2018) combines VAEs with", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 584, + 504, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 584, + 504, + 595 + ], + "score": 1.0, + "content": "a vector quantization (VQ) stage in the latent layer. Latents become discrete through quantization", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 594, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 505, + 607 + ], + "score": 1.0, + "content": "but gradients for learning are adapted from latent values before they are processed by the VQ stage.", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 605, + 505, + 617 + ], + "spans": [ + { + "bbox": [ + 106, + 605, + 505, + 617 + ], + "score": 1.0, + "content": "All methods have the goal of treating discrete distributions such that standard VAE training as de-", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "score": 1.0, + "content": "veloped for continuous latents can still be applied. These techniques interact during training with", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "score": 1.0, + "content": "the standard methods (Points A-D) already in place for VAE optimization. Furthermore, they add", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 638, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 106, + 638, + 505, + 651 + ], + "score": 1.0, + "content": "further types of design decisions and hyper-parameters, for example parameters for annealing from", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 648, + 445, + 661 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 445, + 661 + ], + "score": 1.0, + "content": "softened discrete distributions to the (hard) original distributions for discrete latents.", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 38.5 + }, + { + "type": "text", + "bbox": [ + 107, + 666, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "For discrete VAEs, it may consequently be a desirable goal to investigate alternative, more direct", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "optimization procedures that do not require a softening of discrete distributions or the use of other", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "indirect solutions. Such a direct approach is challenging, however, because once DNNs are used to", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "define the encoding model (Point B) standard tricks to estimate gradients (Point C) seem unavoid-", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "able. A direct optimization procedure, as is investigated here, consequently has to substantially", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 719, + 506, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 506, + 734 + ], + "score": 1.0, + "content": "change VAE training. 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Typically we seek model parameters", + "type": "text" + }, + { + "bbox": [ + 360, + 122, + 369, + 131 + ], + "score": 0.81, + "content": "\\Theta", + "type": "inline_equation" + }, + { + "bbox": [ + 369, + 122, + 505, + 133 + ], + "score": 1.0, + "content": "of a VAE that maximize the data", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 104, + 131, + 507, + 147 + ], + "spans": [ + { + "bbox": [ + 104, + 131, + 168, + 147 + ], + "score": 1.0, + "content": "log-likelihood,", + "type": "text" + }, + { + "bbox": [ + 168, + 132, + 285, + 146 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\mathrm { L } ( \\Theta ) = \\sum _ { n } \\log \\left( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } ) \\right) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 131, + 374, + 147 + ], + "score": 1.0, + "content": ", where we denote by", + "type": "text" + }, + { + "bbox": [ + 374, + 132, + 401, + 144 + ], + "score": 0.91, + "content": "\\vec { x } ^ { ( 1 : N ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 131, + 435, + 147 + ], + "score": 1.0, + "content": "a set of", + "type": "text" + }, + { + "bbox": [ + 435, + 133, + 446, + 143 + ], + "score": 0.8, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 131, + 507, + 147 + ], + "score": 1.0, + "content": "observed data", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 146, + 505, + 158 + ], + "spans": [ + { + "bbox": [ + 106, + 146, + 182, + 158 + ], + "score": 1.0, + "content": "points, and where", + "type": "text" + }, + { + "bbox": [ + 183, + 146, + 209, + 157 + ], + "score": 0.9, + "content": "p _ { \\Theta } ( \\vec { x } )", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 146, + 505, + 158 + ], + "score": 1.0, + "content": "denotes the modeled data distribution. 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Unlike conventional autoencoders, however, the generation of data", + "type": "text" + }, + { + "bbox": [ + 497, + 168, + 504, + 177 + ], + "score": 0.81, + "content": "\\vec { x }", + "type": "inline_equation" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 179, + 411, + 190 + ], + "spans": [ + { + "bbox": [ + 106, + 179, + 411, + 190 + ], + "score": 1.0, + "content": "is not deterministic but it takes the form of a probabilistic generative model.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 5, + "bbox_fs": [ + 104, + 110, + 507, + 190 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 195, + 505, + 217 + ], + "lines": [ + { + "bbox": [ + 105, + 193, + 506, + 209 + ], + "spans": [ + { + "bbox": [ + 105, + 193, + 506, + 209 + ], + "score": 1.0, + "content": "For VAEs with binary latent variables, as they will be of interest here, we consider the following", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 205, + 201, + 218 + ], + "spans": [ + { + "bbox": [ + 106, + 205, + 201, + 218 + ], + "score": 1.0, + "content": "VAE generative model:", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 9.5, + "bbox_fs": [ + 105, + 193, + 506, + 218 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 117, + 223, + 481, + 239 + ], + "lines": [ + { + "bbox": [ + 117, + 223, + 481, + 239 + ], + "spans": [ + { + "bbox": [ + 117, + 223, + 481, + 239 + ], + "score": 0.91, + "content": "\\begin{array} { r } { p _ { \\Theta } ( \\vec { z } ) = \\mathrm { B e r n } ( \\vec { z } ; \\vec { \\pi } ) = \\prod _ { h } \\big ( \\pi _ { h } ^ { z _ { h } } ( 1 - \\pi _ { h } ) ^ { ( 1 - z _ { h } ) } \\big ) , \\qquad p _ { \\Theta } ( \\vec { x } \\mid \\vec { z } ) = \\mathcal { N } \\big ( \\vec { x } ; \\vec { \\mu } ( \\vec { z } ; W ) , \\sigma ^ { 2 } \\mathbb { I } \\big ) , } \\end{array}", + "type": "interline_equation", + "image_path": "f8edc23be805e25f0d5792a4bb55f7f28d732c15601a166dea0c72075c0ffe0f.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 117, + 223, + 481, + 239 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 243, + 505, + 333 + ], + "lines": [ + { + "bbox": [ + 105, + 243, + 505, + 257 + ], + "spans": [ + { + "bbox": [ + 105, + 244, + 134, + 257 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 135, + 243, + 188, + 256 + ], + "score": 0.94, + "content": "\\vec { z } \\in \\{ 0 , 1 \\} ^ { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 244, + 374, + 257 + ], + "score": 1.0, + "content": "is a binary code and the non-linear function", + "type": "text" + }, + { + "bbox": [ + 374, + 244, + 409, + 257 + ], + "score": 0.93, + "content": "\\vec { \\mu } ( \\vec { z } ; W )", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 244, + 505, + 257 + ], + "score": 1.0, + "content": "is a DNN that outputs", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 255, + 505, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 255, + 267, + 268 + ], + "score": 1.0, + "content": "the mean of the Gaussian distribution.", + "type": "text" + }, + { + "bbox": [ + 267, + 255, + 305, + 267 + ], + "score": 0.92, + "content": "p _ { \\Theta } ( \\vec { x } \\vert \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 306, + 255, + 505, + 268 + ], + "score": 1.0, + "content": "is commonly referred to as decoder. The set of", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 266, + 506, + 279 + ], + "spans": [ + { + "bbox": [ + 105, + 266, + 190, + 279 + ], + "score": 1.0, + "content": "model parameters is", + "type": "text" + }, + { + "bbox": [ + 190, + 266, + 256, + 279 + ], + "score": 0.93, + "content": "\\Theta = \\{ \\vec { \\pi } , W , \\sigma ^ { 2 } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 257, + 266, + 287, + 279 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 288, + 267, + 299, + 277 + ], + "score": 0.69, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 300, + 266, + 506, + 279 + ], + "score": 1.0, + "content": "incorporates DNN weights and biases. We assume", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 277, + 505, + 290 + ], + "spans": [ + { + "bbox": [ + 105, + 277, + 505, + 290 + ], + "score": 1.0, + "content": "homoscedasticity of the Gaussian distribution, but note that there is no obstacle to generalizing the", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 289, + 505, + 301 + ], + "spans": [ + { + "bbox": [ + 106, + 289, + 505, + 301 + ], + "score": 1.0, + "content": "model by inserting a DNN non-linearity that outputs a correlation matrix. Similarly, the algorithm", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 299, + 505, + 312 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 505, + 312 + ], + "score": 1.0, + "content": "could easily be generalized to different noise distributions should the task at hand call for it. For", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 310, + 505, + 323 + ], + "spans": [ + { + "bbox": [ + 105, + 310, + 505, + 323 + ], + "score": 1.0, + "content": "the purpose of this work, however, we will focus on as elementary as possible VAEs, with the form", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 320, + 185, + 334 + ], + "spans": [ + { + "bbox": [ + 105, + 320, + 185, + 334 + ], + "score": 1.0, + "content": "shown in Eqn. (1).", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 243, + 506, + 334 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 338, + 504, + 361 + ], + "lines": [ + { + "bbox": [ + 106, + 338, + 504, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 338, + 504, + 351 + ], + "score": 1.0, + "content": "Given standard or binary-latent VAEs, essentially all learning algorithms seek to approximately", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 349, + 500, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 349, + 500, + 362 + ], + "score": 1.0, + "content": "maximize the log-likelihood using the following series of methods (we elaborate in the appendix):", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 20.5, + "bbox_fs": [ + 106, + 338, + 504, + 362 + ] + }, + { + "type": "list", + "bbox": [ + 123, + 367, + 505, + 459 + ], + "lines": [ + { + "bbox": [ + 123, + 367, + 478, + 381 + ], + "spans": [ + { + "bbox": [ + 123, + 367, + 478, + 381 + ], + "score": 1.0, + "content": "(A) Instead of the log-likelihood, a variational lower-bound (a.k.a. ELBO) is optimized.", + "type": "text" + } + ], + "index": 22, + "is_list_start_line": true, + "is_list_end_line": true + }, + { + "bbox": [ + 124, + 379, + 505, + 393 + ], + "spans": [ + { + "bbox": [ + 124, + 379, + 505, + 393 + ], + "score": 1.0, + "content": "(B) VAE posteriors are approximated by an encoding model, that is a specific distribution (often", + "type": "text" + } + ], + "index": 23, + "is_list_start_line": true + }, + { + "bbox": [ + 141, + 390, + 338, + 404 + ], + "spans": [ + { + "bbox": [ + 141, + 390, + 338, + 404 + ], + "score": 1.0, + "content": "Gaussian) parameterized by one or more DNNs.", + "type": "text" + } + ], + "index": 24, + "is_list_end_line": true + }, + { + "bbox": [ + 124, + 402, + 505, + 416 + ], + "spans": [ + { + "bbox": [ + 124, + 403, + 140, + 415 + ], + "score": 1.0, + "content": "(C)", + "type": "text" + }, + { + "bbox": [ + 141, + 402, + 505, + 416 + ], + "score": 1.0, + "content": "The variational parameters of the encoder are optimized using gradient ascent on the lower", + "type": "text" + } + ], + "index": 25, + "is_list_start_line": true + }, + { + "bbox": [ + 141, + 414, + 505, + 427 + ], + "spans": [ + { + "bbox": [ + 141, + 414, + 505, + 427 + ], + "score": 1.0, + "content": "bound, where the gradient is evaluated based on sampling and reparameterization trick to", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 141, + 423, + 436, + 438 + ], + "spans": [ + { + "bbox": [ + 141, + 423, + 436, + 438 + ], + "score": 1.0, + "content": "obtain sufficiently low-variance and yet efficiently computable estimates.", + "type": "text" + } + ], + "index": 27, + "is_list_end_line": true + }, + { + "bbox": [ + 124, + 436, + 505, + 450 + ], + "spans": [ + { + "bbox": [ + 124, + 436, + 505, + 450 + ], + "score": 1.0, + "content": "(D) Using samples from the encoder, the parameters of the decoder are optimized using gradient", + "type": "text" + } + ], + "index": 28, + "is_list_start_line": true + }, + { + "bbox": [ + 141, + 448, + 296, + 459 + ], + "spans": [ + { + "bbox": [ + 141, + 448, + 296, + 459 + ], + "score": 1.0, + "content": "ascent on the variational lower bound.", + "type": "text" + } + ], + "index": 29, + "is_list_end_line": true + } + ], + "index": 25.5, + "bbox_fs": [ + 123, + 367, + 505, + 459 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 462, + 505, + 660 + ], + "lines": [ + { + "bbox": [ + 106, + 462, + 505, + 475 + ], + "spans": [ + { + "bbox": [ + 106, + 462, + 505, + 475 + ], + "score": 1.0, + "content": "Optimization procedures for VAEs with discrete latents follow the same steps (Points A to D). How-", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 474, + 505, + 486 + ], + "spans": [ + { + "bbox": [ + 106, + 474, + 505, + 486 + ], + "score": 1.0, + "content": "ever, discrete or binary latents pose substantial further obstacles in learning, mainly due to the fact", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 505, + 497 + ], + "score": 1.0, + "content": "that backpropagation through discrete variables is generally not possible (Rolfe, 2016; Bengio et al.,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 495, + 505, + 508 + ], + "spans": [ + { + "bbox": [ + 105, + 495, + 505, + 508 + ], + "score": 1.0, + "content": "2013). In order to maintain the general VAE framework for encoder optimization, different groups", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 505, + 519 + ], + "score": 1.0, + "content": "have therefore suggested different possible solutions: work by Rolfe (2016), for instance, extends", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 516, + 505, + 530 + ], + "spans": [ + { + "bbox": [ + 105, + 516, + 505, + 530 + ], + "score": 1.0, + "content": "VAEs with discrete latents by auxiliary continuous latents such that gradients can still be computed.", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 526, + 506, + 542 + ], + "spans": [ + { + "bbox": [ + 105, + 526, + 506, + 542 + ], + "score": 1.0, + "content": "Work on the concrete distribution (Maddison et al., 2016) or Gumbel-softmax distribution (Jang", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 539, + 506, + 552 + ], + "spans": [ + { + "bbox": [ + 105, + 539, + 506, + 552 + ], + "score": 1.0, + "content": "et al., 2016) proposes newly defined continuous distributions that contain discrete distributions as", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "score": 1.0, + "content": "limit cases. Work by Lorberbom et al. (2019) merges the Gumbel-Max reparameterization with the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 505, + 574 + ], + "score": 1.0, + "content": "use of direct loss minimization for gradient estimation, enabling efficient training on structured la-", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 572, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 505, + 584 + ], + "score": 1.0, + "content": "tent spaces. Finally, work by van den Oord et al. (2017), and Roy et al. (2018) combines VAEs with", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 584, + 504, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 584, + 504, + 595 + ], + "score": 1.0, + "content": "a vector quantization (VQ) stage in the latent layer. Latents become discrete through quantization", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 594, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 505, + 607 + ], + "score": 1.0, + "content": "but gradients for learning are adapted from latent values before they are processed by the VQ stage.", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 605, + 505, + 617 + ], + "spans": [ + { + "bbox": [ + 106, + 605, + 505, + 617 + ], + "score": 1.0, + "content": "All methods have the goal of treating discrete distributions such that standard VAE training as de-", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 505, + 629 + ], + "score": 1.0, + "content": "veloped for continuous latents can still be applied. These techniques interact during training with", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 627, + 505, + 639 + ], + "score": 1.0, + "content": "the standard methods (Points A-D) already in place for VAE optimization. Furthermore, they add", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 638, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 106, + 638, + 505, + 651 + ], + "score": 1.0, + "content": "further types of design decisions and hyper-parameters, for example parameters for annealing from", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 648, + 445, + 661 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 445, + 661 + ], + "score": 1.0, + "content": "softened discrete distributions to the (hard) original distributions for discrete latents.", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 38.5, + "bbox_fs": [ + 105, + 462, + 506, + 661 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 666, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "For discrete VAEs, it may consequently be a desirable goal to investigate alternative, more direct", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "optimization procedures that do not require a softening of discrete distributions or the use of other", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "indirect solutions. Such a direct approach is challenging, however, because once DNNs are used to", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "define the encoding model (Point B) standard tricks to estimate gradients (Point C) seem unavoid-", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "able. A direct optimization procedure, as is investigated here, consequently has to substantially", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 719, + 506, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 506, + 734 + ], + "score": 1.0, + "content": "change VAE training. For the data model (1) we will maintain the variational setting and a decoding", + "type": "text" + } + ], + "index": 53 + }, + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "score": 1.0, + "content": "model with DNNs as non-linearity (Points A and D). However, we will not use an encoder model", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "score": 1.0, + "content": "parameterized by DNNs (Point B). Instead, the variational bound will be increased w.r.t. the encoder", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "model by using a discrete optimization approach. The procedure does not require gradients to be", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "score": 1.0, + "content": "computed for the encoder such that discrete latents are addressed without the use of reparameteriza-", + "type": "text", + "cross_page": true + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 126, + 267, + 139 + ], + "spans": [ + { + "bbox": [ + 106, + 126, + 267, + 139 + ], + "score": 1.0, + "content": "tion trick and sampling approximations.", + "type": "text", + "cross_page": true + } + ], + "index": 4 + } + ], + "index": 50.5, + "bbox_fs": [ + 105, + 665, + 506, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 81, + 505, + 138 + ], + "lines": [ + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "score": 1.0, + "content": "model with DNNs as non-linearity (Points A and D). However, we will not use an encoder model", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "score": 1.0, + "content": "parameterized by DNNs (Point B). Instead, the variational bound will be increased w.r.t. the encoder", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "spans": [ + { + "bbox": [ + 106, + 105, + 505, + 117 + ], + "score": 1.0, + "content": "model by using a discrete optimization approach. The procedure does not require gradients to be", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "score": 1.0, + "content": "computed for the encoder such that discrete latents are addressed without the use of reparameteriza-", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 126, + 267, + 139 + ], + "spans": [ + { + "bbox": [ + 106, + 126, + 267, + 139 + ], + "score": 1.0, + "content": "tion trick and sampling approximations.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2 + }, + { + "type": "title", + "bbox": [ + 107, + 154, + 344, + 167 + ], + "lines": [ + { + "bbox": [ + 104, + 151, + 345, + 170 + ], + "spans": [ + { + "bbox": [ + 104, + 151, + 345, + 170 + ], + "score": 1.0, + "content": "2 TRUNCATED VARIATIONAL OPTIMIZATION", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 5 + }, + { + "type": "text", + "bbox": [ + 106, + 177, + 505, + 223 + ], + "lines": [ + { + "bbox": [ + 103, + 177, + 506, + 193 + ], + "spans": [ + { + "bbox": [ + 103, + 177, + 414, + 193 + ], + "score": 1.0, + "content": "Let us consider the variational lower bound of the likelihood. If we denote by", + "type": "text" + }, + { + "bbox": [ + 415, + 177, + 444, + 192 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 177, + 506, + 193 + ], + "score": 1.0, + "content": "the variational", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 103, + 189, + 507, + 210 + ], + "spans": [ + { + "bbox": [ + 103, + 189, + 225, + 210 + ], + "score": 1.0, + "content": "distributions with parameters", + "type": "text" + }, + { + "bbox": [ + 225, + 191, + 243, + 204 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 189, + 277, + 210 + ], + "score": 1.0, + "content": ", and by", + "type": "text" + }, + { + "bbox": [ + 277, + 191, + 406, + 209 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\left. h ( \\vec { z } ) \\right. _ { q _ { \\Phi } ^ { ( n ) } } = \\sum _ { \\vec { z } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) h ( \\vec { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 189, + 507, + 210 + ], + "score": 1.0, + "content": "expectation values w.r.t.", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 208, + 311, + 225 + ], + "spans": [ + { + "bbox": [ + 106, + 209, + 117, + 225 + ], + "score": 1.0, + "content": "to", + "type": "text" + }, + { + "bbox": [ + 117, + 208, + 147, + 224 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 209, + 311, + 225 + ], + "score": 1.0, + "content": ", then the lower bound can be written as:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7 + }, + { + "type": "interline_equation", + "bbox": [ + 152, + 229, + 458, + 249 + ], + "lines": [ + { + "bbox": [ + 152, + 229, + 458, + 249 + ], + "spans": [ + { + "bbox": [ + 152, + 229, + 458, + 249 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\vert \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } - \\sum _ { n } \\big \\langle \\log \\big ( q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } , } \\end{array}", + "type": "interline_equation", + "image_path": "7a7ed7bc476115e84ca37d44ec70dd0ac296dc0bedebfaf09aa23f522754f058.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 152, + 229, + 458, + 249 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 254, + 506, + 403 + ], + "lines": [ + { + "bbox": [ + 105, + 253, + 506, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 253, + 296, + 268 + ], + "score": 1.0, + "content": "The general challenge for the maximization of", + "type": "text" + }, + { + "bbox": [ + 297, + 255, + 333, + 267 + ], + "score": 0.94, + "content": "\\mathcal { F } ( \\Phi , \\Theta )", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 253, + 506, + 268 + ], + "score": 1.0, + "content": "is the optimization of the encoding model", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 266, + 505, + 281 + ], + "spans": [ + { + "bbox": [ + 107, + 266, + 124, + 281 + ], + "score": 0.91, + "content": "q _ { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 267, + 505, + 281 + ], + "score": 1.0, + "content": ". VAEs with discrete latents add to this challenge the problem of taking gradients w.r.t. discrete", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 280, + 505, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 280, + 505, + 292 + ], + "score": 1.0, + "content": "latents. If we seek to avoid derivatives w.r.t. discrete variables, we have to define an alternative en-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 289, + 505, + 308 + ], + "spans": [ + { + "bbox": [ + 104, + 289, + 163, + 308 + ], + "score": 1.0, + "content": "coding model", + "type": "text" + }, + { + "bbox": [ + 163, + 290, + 181, + 305 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 289, + 505, + 308 + ], + "score": 1.0, + "content": "but such an encoding has to remain sufficiently efficient. Considering prior work", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 304, + 505, + 316 + ], + "spans": [ + { + "bbox": [ + 105, + 304, + 505, + 316 + ], + "score": 1.0, + "content": "on generative models with discrete latents, variational distributions based on truncated posteriors", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 314, + 505, + 327 + ], + "spans": [ + { + "bbox": [ + 105, + 314, + 505, + 327 + ], + "score": 1.0, + "content": "offer themselves as such an alternative (Lucke & Sahani, 2008). Truncated posterior approxima- ¨", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 326, + 505, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 326, + 505, + 338 + ], + "score": 1.0, + "content": "tions have been shown to be functionally competitive (e.g. Sheikh et al., 2014; Hughes & Sudderth,", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 336, + 506, + 349 + ], + "spans": [ + { + "bbox": [ + 105, + 336, + 506, + 349 + ], + "score": 1.0, + "content": "2016; Shelton et al., 2017), and they are able to efficiently train also very large scale models with", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 345, + 506, + 360 + ], + "spans": [ + { + "bbox": [ + 104, + 345, + 506, + 360 + ], + "score": 1.0, + "content": "hundreds or thousands of latents (e.g. Shelton et al., 2011; Sheikh & Lucke, 2016; Forster & L ¨ ucke, ¨", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 358, + 506, + 371 + ], + "spans": [ + { + "bbox": [ + 105, + 358, + 506, + 371 + ], + "score": 1.0, + "content": "2018). However, the important question for training discrete VAEs is if or how truncated variational", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 368, + 506, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 368, + 506, + 381 + ], + "score": 1.0, + "content": "distributions can be used in gradient-based optimization of neural network parameters. We here,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 380, + 506, + 394 + ], + "spans": [ + { + "bbox": [ + 105, + 380, + 506, + 394 + ], + "score": 1.0, + "content": "for the first time, address this question noting that all previous approaches relied on closed-form (or", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 391, + 505, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 391, + 505, + 404 + ], + "score": 1.0, + "content": "pseudo-closed form) parameter update equations in an expectation-maximization learning paradigm.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 16 + }, + { + "type": "text", + "bbox": [ + 106, + 407, + 505, + 500 + ], + "lines": [ + { + "bbox": [ + 106, + 408, + 505, + 420 + ], + "spans": [ + { + "bbox": [ + 106, + 408, + 408, + 420 + ], + "score": 1.0, + "content": "Optimization of the Decoding Model. In order to optimize the parameters", + "type": "text" + }, + { + "bbox": [ + 409, + 408, + 421, + 418 + ], + "score": 0.5, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 408, + 505, + 420 + ], + "score": 1.0, + "content": "of the decoder DNN", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 107, + 419, + 505, + 432 + ], + "spans": [ + { + "bbox": [ + 107, + 419, + 141, + 431 + ], + "score": 0.92, + "content": "\\vec { \\mu } ( \\vec { z } , W )", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 419, + 334, + 432 + ], + "score": 1.0, + "content": ", the gradient of the variational bound (2) w.r.t.", + "type": "text" + }, + { + "bbox": [ + 334, + 419, + 346, + 429 + ], + "score": 0.3, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 419, + 505, + 432 + ], + "score": 1.0, + "content": "has to be computed. We consequently", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 430, + 505, + 443 + ], + "spans": [ + { + "bbox": [ + 105, + 430, + 505, + 443 + ], + "score": 1.0, + "content": "need, for any VAE, a sufficiently precise and efficient approximation of the expectation value w.r.t.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 441, + 506, + 458 + ], + "spans": [ + { + "bbox": [ + 105, + 441, + 156, + 458 + ], + "score": 1.0, + "content": "the encoder", + "type": "text" + }, + { + "bbox": [ + 156, + 441, + 187, + 456 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 441, + 506, + 458 + ], + "score": 1.0, + "content": ". Gradient estimation is of central importance for deep unsupervised learning,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 455, + 505, + 467 + ], + "spans": [ + { + "bbox": [ + 105, + 455, + 505, + 467 + ], + "score": 1.0, + "content": "and approaches, e.g., for variance reduction of estimators have played an important role and are", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 465, + 506, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 465, + 506, + 478 + ], + "score": 1.0, + "content": "dedicated solely to this purpose (e.g., Williams, 1992). Reparameterization finally emerged as a", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 476, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 505, + 489 + ], + "score": 1.0, + "content": "key method because it allowed for sufficiently low-variance estimation of gradients based, e.g., on", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 488, + 420, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 420, + 500 + ], + "score": 1.0, + "content": "Gaussian middle-layer units (Kingma & Welling, 2014; Rezende et al., 2014).", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 26.5 + }, + { + "type": "text", + "bbox": [ + 107, + 504, + 502, + 527 + ], + "lines": [ + { + "bbox": [ + 106, + 504, + 504, + 516 + ], + "spans": [ + { + "bbox": [ + 106, + 504, + 504, + 516 + ], + "score": 1.0, + "content": "For discrete VAEs, however, reparameterization requires the introduction of additional manipula-", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 515, + 354, + 527 + ], + "spans": [ + { + "bbox": [ + 106, + 515, + 354, + 527 + ], + "score": 1.0, + "content": "tions of discrete distributions that we here seek to fully avoid.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5 + }, + { + "type": "text", + "bbox": [ + 107, + 532, + 503, + 555 + ], + "lines": [ + { + "bbox": [ + 106, + 532, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 106, + 532, + 505, + 545 + ], + "score": 1.0, + "content": "Instead of using reparameterization or variance reduction, we will compute gradients based on trun-", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 542, + 462, + 557 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 462, + 557 + ], + "score": 1.0, + "content": "cated posterior as variational distributions. A truncated posterior has the following form:", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33.5 + }, + { + "type": "interline_equation", + "bbox": [ + 119, + 560, + 479, + 591 + ], + "lines": [ + { + "bbox": [ + 119, + 560, + 479, + 591 + ], + "spans": [ + { + "bbox": [ + 119, + 560, + 479, + 591 + ], + "score": 0.94, + "content": "\\begin{array} { r l } { q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) : = } & { \\frac { p _ { \\Theta } ( \\vec { z } | \\vec { x } ^ { ( n ) } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } \\left( \\vec { z } ^ { \\prime } | \\vec { x } ^ { ( n ) } \\right) } = \\frac { p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ^ { \\prime } ) p _ { \\Theta } \\left( \\vec { z } ^ { \\prime } \\right) } \\mathrm { i f } \\vec { z } \\in \\Phi ^ { ( n ) } , } \\end{array}", + "type": "interline_equation", + "image_path": "c047b01917f1235f0c1dd8f594493139afbcafd1bb643a621681b0e6261b243b.jpg" + } + ] + } + ], + "index": 36, + "virtual_lines": [ + { + "bbox": [ + 119, + 560, + 479, + 570.3333333333334 + ], + "spans": [], + "index": 35 + }, + { + "bbox": [ + 119, + 570.3333333333334, + 479, + 580.6666666666667 + ], + "spans": [], + "index": 36 + }, + { + "bbox": [ + 119, + 580.6666666666667, + 479, + 591.0000000000001 + ], + "spans": [], + "index": 37 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 597, + 508, + 626 + ], + "lines": [ + { + "bbox": [ + 103, + 592, + 505, + 617 + ], + "spans": [ + { + "bbox": [ + 103, + 592, + 160, + 617 + ], + "score": 1.0, + "content": "where for all", + "type": "text" + }, + { + "bbox": [ + 160, + 596, + 196, + 611 + ], + "score": 0.93, + "content": "\\vec { z } \\not \\in \\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 592, + 259, + 617 + ], + "score": 1.0, + "content": "the probability", + "type": "text" + }, + { + "bbox": [ + 259, + 596, + 289, + 612 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 592, + 473, + 617 + ], + "score": 1.0, + "content": "equals zero. That is, a variational distribution", + "type": "text" + }, + { + "bbox": [ + 475, + 594, + 505, + 613 + ], + "score": 1.0, + "content": "q(n)Φ (~z)", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 103, + 607, + 479, + 629 + ], + "spans": [ + { + "bbox": [ + 103, + 607, + 297, + 629 + ], + "score": 1.0, + "content": "is proportional to the true posteriors in a subset", + "type": "text" + }, + { + "bbox": [ + 297, + 611, + 316, + 624 + ], + "score": 0.88, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 607, + 479, + 629 + ], + "score": 1.0, + "content": ", which acts as its variational parameter.", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 38.5 + }, + { + "type": "text", + "bbox": [ + 105, + 630, + 456, + 642 + ], + "lines": [ + { + "bbox": [ + 105, + 629, + 456, + 644 + ], + "spans": [ + { + "bbox": [ + 105, + 629, + 373, + 644 + ], + "score": 1.0, + "content": "We can now compute the gradient of (2) w.r.t. the decoder weights", + "type": "text" + }, + { + "bbox": [ + 374, + 631, + 385, + 640 + ], + "score": 0.71, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 629, + 456, + 644 + ], + "score": 1.0, + "content": "which results in:", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 40 + }, + { + "type": "interline_equation", + "bbox": [ + 168, + 647, + 443, + 680 + ], + "lines": [ + { + "bbox": [ + 168, + 647, + 443, + 680 + ], + "spans": [ + { + "bbox": [ + 168, + 647, + 443, + 680 + ], + "score": 0.94, + "content": "\\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) = - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) ~ \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } .", + "type": "interline_equation", + "image_path": "133d65dbd4628205618395c413dccfe7f428cedfb6b93985c1d45467fe477069.jpg" + } + ] + } + ], + "index": 42, + "virtual_lines": [ + { + "bbox": [ + 168, + 647, + 443, + 658.0 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 168, + 658.0, + 443, + 669.0 + ], + "spans": [], + "index": 42 + }, + { + "bbox": [ + 168, + 669.0, + 443, + 680.0 + ], + "spans": [], + "index": 43 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 685, + 505, + 733 + ], + "lines": [ + { + "bbox": [ + 106, + 685, + 505, + 697 + ], + "spans": [ + { + "bbox": [ + 106, + 685, + 505, + 697 + ], + "score": 1.0, + "content": "The right-hand-side has salient similarities to the standard gradient ascent for VAE decoders. Es-", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 104, + 695, + 505, + 708 + ], + "spans": [ + { + "bbox": [ + 104, + 695, + 505, + 708 + ], + "score": 1.0, + "content": "pecially the familiar gradient of the mean squared error (MSE) shows that, e.g., standard automatic", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 707, + 505, + 720 + ], + "spans": [ + { + "bbox": [ + 105, + 707, + 505, + 720 + ], + "score": 1.0, + "content": "differentiation tools can be applied. However, the decisive difference are the weighting factors", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 718, + 505, + 734 + ], + "spans": [ + { + "bbox": [ + 106, + 718, + 137, + 733 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 718, + 442, + 734 + ], + "score": 1.0, + "content": ". 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If we denote by", + "type": "text" + }, + { + "bbox": [ + 415, + 177, + 444, + 192 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 445, + 177, + 506, + 193 + ], + "score": 1.0, + "content": "the variational", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 103, + 189, + 507, + 210 + ], + "spans": [ + { + "bbox": [ + 103, + 189, + 225, + 210 + ], + "score": 1.0, + "content": "distributions with parameters", + "type": "text" + }, + { + "bbox": [ + 225, + 191, + 243, + 204 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 189, + 277, + 210 + ], + "score": 1.0, + "content": ", and by", + "type": "text" + }, + { + "bbox": [ + 277, + 191, + 406, + 209 + ], + "score": 0.94, + "content": "\\begin{array} { r } { \\left. h ( \\vec { z } ) \\right. _ { q _ { \\Phi } ^ { ( n ) } } = \\sum _ { \\vec { z } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) h ( \\vec { z } ) } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 189, + 507, + 210 + ], + "score": 1.0, + "content": "expectation values w.r.t.", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 208, + 311, + 225 + ], + "spans": [ + { + "bbox": [ + 106, + 209, + 117, + 225 + ], + "score": 1.0, + "content": "to", + "type": "text" + }, + { + "bbox": [ + 117, + 208, + 147, + 224 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( { \\vec { z } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 209, + 311, + 225 + ], + "score": 1.0, + "content": ", then the lower bound can be written as:", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 7, + "bbox_fs": [ + 103, + 177, + 507, + 225 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 152, + 229, + 458, + 249 + ], + "lines": [ + { + "bbox": [ + 152, + 229, + 458, + 249 + ], + "spans": [ + { + "bbox": [ + 152, + 229, + 458, + 249 + ], + "score": 0.91, + "content": "\\begin{array} { r } { \\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\vert \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } - \\sum _ { n } \\big \\langle \\log \\big ( q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } , } \\end{array}", + "type": "interline_equation", + "image_path": "7a7ed7bc476115e84ca37d44ec70dd0ac296dc0bedebfaf09aa23f522754f058.jpg" + } + ] + } + ], + "index": 9, + "virtual_lines": [ + { + "bbox": [ + 152, + 229, + 458, + 249 + ], + "spans": [], + "index": 9 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 254, + 506, + 403 + ], + "lines": [ + { + "bbox": [ + 105, + 253, + 506, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 253, + 296, + 268 + ], + "score": 1.0, + "content": "The general challenge for the maximization of", + "type": "text" + }, + { + "bbox": [ + 297, + 255, + 333, + 267 + ], + "score": 0.94, + "content": "\\mathcal { F } ( \\Phi , \\Theta )", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 253, + 506, + 268 + ], + "score": 1.0, + "content": "is the optimization of the encoding model", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 107, + 266, + 505, + 281 + ], + "spans": [ + { + "bbox": [ + 107, + 266, + 124, + 281 + ], + "score": 0.91, + "content": "q _ { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 267, + 505, + 281 + ], + "score": 1.0, + "content": ". VAEs with discrete latents add to this challenge the problem of taking gradients w.r.t. discrete", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 280, + 505, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 280, + 505, + 292 + ], + "score": 1.0, + "content": "latents. If we seek to avoid derivatives w.r.t. discrete variables, we have to define an alternative en-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 289, + 505, + 308 + ], + "spans": [ + { + "bbox": [ + 104, + 289, + 163, + 308 + ], + "score": 1.0, + "content": "coding model", + "type": "text" + }, + { + "bbox": [ + 163, + 290, + 181, + 305 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 289, + 505, + 308 + ], + "score": 1.0, + "content": "but such an encoding has to remain sufficiently efficient. Considering prior work", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 304, + 505, + 316 + ], + "spans": [ + { + "bbox": [ + 105, + 304, + 505, + 316 + ], + "score": 1.0, + "content": "on generative models with discrete latents, variational distributions based on truncated posteriors", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 314, + 505, + 327 + ], + "spans": [ + { + "bbox": [ + 105, + 314, + 505, + 327 + ], + "score": 1.0, + "content": "offer themselves as such an alternative (Lucke & Sahani, 2008). Truncated posterior approxima- ¨", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 326, + 505, + 338 + ], + "spans": [ + { + "bbox": [ + 105, + 326, + 505, + 338 + ], + "score": 1.0, + "content": "tions have been shown to be functionally competitive (e.g. Sheikh et al., 2014; Hughes & Sudderth,", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 336, + 506, + 349 + ], + "spans": [ + { + "bbox": [ + 105, + 336, + 506, + 349 + ], + "score": 1.0, + "content": "2016; Shelton et al., 2017), and they are able to efficiently train also very large scale models with", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 104, + 345, + 506, + 360 + ], + "spans": [ + { + "bbox": [ + 104, + 345, + 506, + 360 + ], + "score": 1.0, + "content": "hundreds or thousands of latents (e.g. Shelton et al., 2011; Sheikh & Lucke, 2016; Forster & L ¨ ucke, ¨", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 358, + 506, + 371 + ], + "spans": [ + { + "bbox": [ + 105, + 358, + 506, + 371 + ], + "score": 1.0, + "content": "2018). However, the important question for training discrete VAEs is if or how truncated variational", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 368, + 506, + 381 + ], + "spans": [ + { + "bbox": [ + 105, + 368, + 506, + 381 + ], + "score": 1.0, + "content": "distributions can be used in gradient-based optimization of neural network parameters. We here,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 380, + 506, + 394 + ], + "spans": [ + { + "bbox": [ + 105, + 380, + 506, + 394 + ], + "score": 1.0, + "content": "for the first time, address this question noting that all previous approaches relied on closed-form (or", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 391, + 505, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 391, + 505, + 404 + ], + "score": 1.0, + "content": "pseudo-closed form) parameter update equations in an expectation-maximization learning paradigm.", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 16, + "bbox_fs": [ + 104, + 253, + 506, + 404 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 407, + 505, + 500 + ], + "lines": [ + { + "bbox": [ + 106, + 408, + 505, + 420 + ], + "spans": [ + { + "bbox": [ + 106, + 408, + 408, + 420 + ], + "score": 1.0, + "content": "Optimization of the Decoding Model. In order to optimize the parameters", + "type": "text" + }, + { + "bbox": [ + 409, + 408, + 421, + 418 + ], + "score": 0.5, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 408, + 505, + 420 + ], + "score": 1.0, + "content": "of the decoder DNN", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 107, + 419, + 505, + 432 + ], + "spans": [ + { + "bbox": [ + 107, + 419, + 141, + 431 + ], + "score": 0.92, + "content": "\\vec { \\mu } ( \\vec { z } , W )", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 419, + 334, + 432 + ], + "score": 1.0, + "content": ", the gradient of the variational bound (2) w.r.t.", + "type": "text" + }, + { + "bbox": [ + 334, + 419, + 346, + 429 + ], + "score": 0.3, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 419, + 505, + 432 + ], + "score": 1.0, + "content": "has to be computed. We consequently", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 430, + 505, + 443 + ], + "spans": [ + { + "bbox": [ + 105, + 430, + 505, + 443 + ], + "score": 1.0, + "content": "need, for any VAE, a sufficiently precise and efficient approximation of the expectation value w.r.t.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 441, + 506, + 458 + ], + "spans": [ + { + "bbox": [ + 105, + 441, + 156, + 458 + ], + "score": 1.0, + "content": "the encoder", + "type": "text" + }, + { + "bbox": [ + 156, + 441, + 187, + 456 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 441, + 506, + 458 + ], + "score": 1.0, + "content": ". Gradient estimation is of central importance for deep unsupervised learning,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 455, + 505, + 467 + ], + "spans": [ + { + "bbox": [ + 105, + 455, + 505, + 467 + ], + "score": 1.0, + "content": "and approaches, e.g., for variance reduction of estimators have played an important role and are", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 465, + 506, + 478 + ], + "spans": [ + { + "bbox": [ + 105, + 465, + 506, + 478 + ], + "score": 1.0, + "content": "dedicated solely to this purpose (e.g., Williams, 1992). Reparameterization finally emerged as a", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 476, + 505, + 489 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 505, + 489 + ], + "score": 1.0, + "content": "key method because it allowed for sufficiently low-variance estimation of gradients based, e.g., on", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 488, + 420, + 500 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 420, + 500 + ], + "score": 1.0, + "content": "Gaussian middle-layer units (Kingma & Welling, 2014; Rezende et al., 2014).", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 26.5, + "bbox_fs": [ + 105, + 408, + 506, + 500 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 504, + 502, + 527 + ], + "lines": [ + { + "bbox": [ + 106, + 504, + 504, + 516 + ], + "spans": [ + { + "bbox": [ + 106, + 504, + 504, + 516 + ], + "score": 1.0, + "content": "For discrete VAEs, however, reparameterization requires the introduction of additional manipula-", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 515, + 354, + 527 + ], + "spans": [ + { + "bbox": [ + 106, + 515, + 354, + 527 + ], + "score": 1.0, + "content": "tions of discrete distributions that we here seek to fully avoid.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 31.5, + "bbox_fs": [ + 106, + 504, + 504, + 527 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 532, + 503, + 555 + ], + "lines": [ + { + "bbox": [ + 106, + 532, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 106, + 532, + 505, + 545 + ], + "score": 1.0, + "content": "Instead of using reparameterization or variance reduction, we will compute gradients based on trun-", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 542, + 462, + 557 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 462, + 557 + ], + "score": 1.0, + "content": "cated posterior as variational distributions. A truncated posterior has the following form:", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 33.5, + "bbox_fs": [ + 105, + 532, + 505, + 557 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 119, + 560, + 479, + 591 + ], + "lines": [ + { + "bbox": [ + 119, + 560, + 479, + 591 + ], + "spans": [ + { + "bbox": [ + 119, + 560, + 479, + 591 + ], + "score": 0.94, + "content": "\\begin{array} { r l } { q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) : = } & { \\frac { p _ { \\Theta } ( \\vec { z } | \\vec { x } ^ { ( n ) } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } \\left( \\vec { z } ^ { \\prime } | \\vec { x } ^ { ( n ) } \\right) } = \\frac { p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) } { \\sum _ { \\vec { z } ^ { \\prime } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ^ { \\prime } ) p _ { \\Theta } \\left( \\vec { z } ^ { \\prime } \\right) } \\mathrm { i f } \\vec { z } \\in \\Phi ^ { ( n ) } , } \\end{array}", + "type": "interline_equation", + "image_path": "c047b01917f1235f0c1dd8f594493139afbcafd1bb643a621681b0e6261b243b.jpg" + } + ] + } + ], + "index": 36, + "virtual_lines": [ + { + "bbox": [ + 119, + 560, + 479, + 570.3333333333334 + ], + "spans": [], + "index": 35 + }, + { + "bbox": [ + 119, + 570.3333333333334, + 479, + 580.6666666666667 + ], + "spans": [], + "index": 36 + }, + { + "bbox": [ + 119, + 580.6666666666667, + 479, + 591.0000000000001 + ], + "spans": [], + "index": 37 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 597, + 508, + 626 + ], + "lines": [ + { + "bbox": [ + 103, + 592, + 505, + 617 + ], + "spans": [ + { + "bbox": [ + 103, + 592, + 160, + 617 + ], + "score": 1.0, + "content": "where for all", + "type": "text" + }, + { + "bbox": [ + 160, + 596, + 196, + 611 + ], + "score": 0.93, + "content": "\\vec { z } \\not \\in \\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 592, + 259, + 617 + ], + "score": 1.0, + "content": "the probability", + "type": "text" + }, + { + "bbox": [ + 259, + 596, + 289, + 612 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 592, + 473, + 617 + ], + "score": 1.0, + "content": "equals zero. That is, a variational distribution", + "type": "text" + }, + { + "bbox": [ + 475, + 594, + 505, + 613 + ], + "score": 1.0, + "content": "q(n)Φ (~z)", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 103, + 607, + 479, + 629 + ], + "spans": [ + { + "bbox": [ + 103, + 607, + 297, + 629 + ], + "score": 1.0, + "content": "is proportional to the true posteriors in a subset", + "type": "text" + }, + { + "bbox": [ + 297, + 611, + 316, + 624 + ], + "score": 0.88, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 607, + 479, + 629 + ], + "score": 1.0, + "content": ", which acts as its variational parameter.", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 38.5, + "bbox_fs": [ + 103, + 592, + 505, + 629 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 630, + 456, + 642 + ], + "lines": [ + { + "bbox": [ + 105, + 629, + 456, + 644 + ], + "spans": [ + { + "bbox": [ + 105, + 629, + 373, + 644 + ], + "score": 1.0, + "content": "We can now compute the gradient of (2) w.r.t. the decoder weights", + "type": "text" + }, + { + "bbox": [ + 374, + 631, + 385, + 640 + ], + "score": 0.71, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 386, + 629, + 456, + 644 + ], + "score": 1.0, + "content": "which results in:", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 40, + "bbox_fs": [ + 105, + 629, + 456, + 644 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 168, + 647, + 443, + 680 + ], + "lines": [ + { + "bbox": [ + 168, + 647, + 443, + 680 + ], + "spans": [ + { + "bbox": [ + 168, + 647, + 443, + 680 + ], + "score": 0.94, + "content": "\\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) = - \\frac { 1 } { 2 \\sigma ^ { 2 } } \\sum _ { n } \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) ~ \\vec { \\nabla } _ { W } \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } .", + "type": "interline_equation", + "image_path": "133d65dbd4628205618395c413dccfe7f428cedfb6b93985c1d45467fe477069.jpg" + } + ] + } + ], + "index": 42, + "virtual_lines": [ + { + "bbox": [ + 168, + 647, + 443, + 658.0 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 168, + 658.0, + 443, + 669.0 + ], + "spans": [], + "index": 42 + }, + { + "bbox": [ + 168, + 669.0, + 443, + 680.0 + ], + "spans": [], + "index": 43 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 685, + 505, + 733 + ], + "lines": [ + { + "bbox": [ + 106, + 685, + 505, + 697 + ], + "spans": [ + { + "bbox": [ + 106, + 685, + 505, + 697 + ], + "score": 1.0, + "content": "The right-hand-side has salient similarities to the standard gradient ascent for VAE decoders. Es-", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 104, + 695, + 505, + 708 + ], + "spans": [ + { + "bbox": [ + 104, + 695, + 505, + 708 + ], + "score": 1.0, + "content": "pecially the familiar gradient of the mean squared error (MSE) shows that, e.g., standard automatic", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 707, + 505, + 720 + ], + "spans": [ + { + "bbox": [ + 105, + 707, + 505, + 720 + ], + "score": 1.0, + "content": "differentiation tools can be applied. However, the decisive difference are the weighting factors", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 718, + 505, + 734 + ], + "spans": [ + { + "bbox": [ + 106, + 718, + 137, + 733 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 718, + 442, + 734 + ], + "score": 1.0, + "content": ". 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As all states of Φ(n)", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 330, + 81, + 504, + 96 + ], + "score": 1.0, + "content": "anyway have to be passed through the de-", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "score": 1.0, + "content": "coder for the MSE term of (4), the overall computational complexity is not higher than an estimation", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 105, + 443, + 120 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 298, + 119 + ], + "score": 1.0, + "content": "of the gradient with samples instead of states in", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 298, + 105, + 317, + 118 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 318, + 107, + 443, + 120 + ], + "score": 1.0, + "content": "(we elaborate in Appendix A).", + "type": "text", + "cross_page": true + } + ], + "index": 2 + } + ], + "index": 45.5, + "bbox_fs": [ + 104, + 685, + 505, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 80, + 505, + 119 + ], + "lines": [ + { + "bbox": [ + 104, + 80, + 504, + 96 + ], + "spans": [ + { + "bbox": [ + 104, + 80, + 333, + 96 + ], + "score": 1.0, + "content": "passed through the decoder DNN. As all states of Φ(n)", + "type": "text" + }, + { + "bbox": [ + 330, + 81, + 504, + 96 + ], + "score": 1.0, + "content": "anyway have to be passed through the de-", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 93, + 505, + 106 + ], + "score": 1.0, + "content": "coder for the MSE term of (4), the overall computational complexity is not higher than an estimation", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 105, + 443, + 120 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 298, + 119 + ], + "score": 1.0, + "content": "of the gradient with samples instead of states in", + "type": "text" + }, + { + "bbox": [ + 298, + 105, + 317, + 118 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 107, + 443, + 120 + ], + "score": 1.0, + "content": "(we elaborate in Appendix A).", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 105, + 123, + 504, + 147 + ], + "lines": [ + { + "bbox": [ + 105, + 122, + 505, + 138 + ], + "spans": [ + { + "bbox": [ + 105, + 122, + 382, + 138 + ], + "score": 1.0, + "content": "To complete the decoder optimization, update equations for variance", + "type": "text" + }, + { + "bbox": [ + 382, + 123, + 394, + 134 + ], + "score": 0.87, + "content": "\\sigma ^ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 122, + 480, + 138 + ], + "score": 1.0, + "content": "and prior parameters", + "type": "text" + }, + { + "bbox": [ + 480, + 124, + 488, + 134 + ], + "score": 0.82, + "content": "\\vec { \\pi }", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 122, + 505, + 138 + ], + "score": 1.0, + "content": "can", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 134, + 437, + 148 + ], + "spans": [ + { + "bbox": [ + 105, + 134, + 437, + 148 + ], + "score": 1.0, + "content": "be computed in closed-form (compare, e.g., Shelton et al., 2011) and are given by:", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 3.5 + }, + { + "type": "interline_equation", + "bbox": [ + 120, + 150, + 478, + 177 + ], + "lines": [ + { + "bbox": [ + 120, + 150, + 478, + 177 + ], + "spans": [ + { + "bbox": [ + 120, + 150, + 478, + 177 + ], + "score": 0.92, + "content": "\\begin{array} { r } { \\sigma ^ { 2 , \\mathrm { n e w } } = \\frac { 1 } { D N } \\displaystyle \\sum _ { n } \\displaystyle \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\| \\vec { x } ^ { ( n ) } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } , \\qquad \\vec { \\pi } ^ { \\mathrm { n e w } } = \\frac { 1 } { N } \\displaystyle \\sum _ { n } \\displaystyle \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) \\vec { z } , } \\end{array}", + "type": "interline_equation", + "image_path": "7c860de06ef9e51d22ce71284f77c4fbec8a7e41914a4ff2af80875324988396.jpg" + } + ] + } + ], + "index": 5, + "virtual_lines": [ + { + "bbox": [ + 120, + 150, + 478, + 177 + ], + "spans": [], + "index": 5 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 180, + 481, + 192 + ], + "lines": [ + { + "bbox": [ + 106, + 179, + 483, + 193 + ], + "spans": [ + { + "bbox": [ + 106, + 179, + 133, + 193 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 181, + 144, + 190 + ], + "score": 0.83, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 144, + 179, + 352, + 193 + ], + "score": 1.0, + "content": "is the number of samples in the training dataset and", + "type": "text" + }, + { + "bbox": [ + 353, + 181, + 362, + 190 + ], + "score": 0.84, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 363, + 179, + 483, + 193 + ], + "score": 1.0, + "content": "is the number of observables.", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "text", + "bbox": [ + 106, + 197, + 506, + 242 + ], + "lines": [ + { + "bbox": [ + 106, + 196, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 106, + 196, + 505, + 210 + ], + "score": 1.0, + "content": "Optimization of the Encoding Model. After having established that the decoder can be optimized", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 208, + 505, + 221 + ], + "spans": [ + { + "bbox": [ + 105, + 208, + 505, + 221 + ], + "score": 1.0, + "content": "efficiently and by using standard DNN methods, the important question is if the encoder can be", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 219, + 505, + 231 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 505, + 231 + ], + "score": 1.0, + "content": "trained efficiently. Encoder optimization is usually based on a reformulation of the variational bound", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 230, + 161, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 230, + 161, + 244 + ], + "score": 1.0, + "content": "(2) given by:", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 8.5 + }, + { + "type": "interline_equation", + "bbox": [ + 162, + 245, + 449, + 266 + ], + "lines": [ + { + "bbox": [ + 162, + 245, + 449, + 266 + ], + "spans": [ + { + "bbox": [ + 162, + 245, + 449, + 266 + ], + "score": 0.93, + "content": "\\begin{array} { r } { \\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } - \\sum _ { n } D _ { \\mathrm { K L } } \\big ( q _ { \\Phi } ^ { ( n ) } ( \\vec { z } ) , p _ { \\Theta } ( \\vec { z } ) \\big ) . } \\end{array}", + "type": "interline_equation", + "image_path": "af4af5b504a73659e4afd012cbf0204eaf8e2792c228836182bf08c923eaf4ab.jpg" + } + ] + } + ], + "index": 11, + "virtual_lines": [ + { + "bbox": [ + 162, + 245, + 449, + 266 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 107, + 268, + 505, + 312 + ], + "lines": [ + { + "bbox": [ + 106, + 268, + 504, + 281 + ], + "spans": [ + { + "bbox": [ + 106, + 268, + 504, + 281 + ], + "score": 1.0, + "content": "Centrally for this work, truncated posteriors allow a specific alternative reformulation of the bound", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 280, + 505, + 292 + ], + "spans": [ + { + "bbox": [ + 106, + 280, + 505, + 292 + ], + "score": 1.0, + "content": "that enables efficient optimization. The reformulation recombines the entropy term of the original", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 290, + 505, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 505, + 304 + ], + "score": 1.0, + "content": "form (2) with the first expectation value into a single term, and is given by (see Lucke, 2019, for ¨", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 300, + 142, + 315 + ], + "spans": [ + { + "bbox": [ + 105, + 300, + 142, + 315 + ], + "score": 1.0, + "content": "details):", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 13.5 + }, + { + "type": "interline_equation", + "bbox": [ + 206, + 310, + 404, + 340 + ], + "lines": [ + { + "bbox": [ + 206, + 310, + 404, + 340 + ], + "spans": [ + { + "bbox": [ + 206, + 310, + 404, + 340 + ], + "score": 0.94, + "content": "\\mathcal { F } ( \\Phi , \\Theta ) = \\sum _ { n } \\log \\big ( \\sum _ { \\vec { z } \\in \\Phi ^ { ( n ) } } p _ { \\Theta } ( \\vec { x } ^ { ( n ) } | \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) .", + "type": "interline_equation", + "image_path": "20ac1161402cbccc5fd371a47ba60e20971824da08658e271cf3e5743f28cd23.jpg" + } + ] + } + ], + "index": 16.5, + "virtual_lines": [ + { + "bbox": [ + 206, + 310, + 404, + 325.0 + ], + "spans": [], + "index": 16 + }, + { + "bbox": [ + 206, + 325.0, + 404, + 340.0 + ], + "spans": [], + "index": 17 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 344, + 505, + 406 + ], + "lines": [ + { + "bbox": [ + 103, + 343, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 103, + 343, + 391, + 358 + ], + "score": 1.0, + "content": "Thanks to the simplified form of the bound, the variational parameters", + "type": "text" + }, + { + "bbox": [ + 392, + 343, + 410, + 356 + ], + "score": 0.91, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 343, + 505, + 358 + ], + "score": 1.0, + "content": "of the encoding model", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 357, + 505, + 369 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 505, + 369 + ], + "score": 1.0, + "content": "can now be sought using direct discrete optimization procedures. 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Eliding terms that do not depend on", + "type": "text" + }, + { + "bbox": [ + 390, + 441, + 397, + 450 + ], + "score": 0.83, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 398, + 440, + 442, + 453 + ], + "score": 1.0, + "content": "we obtain:", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 24.5 + }, + { + "type": "interline_equation", + "bbox": [ + 198, + 455, + 412, + 472 + ], + "lines": [ + { + "bbox": [ + 198, + 455, + 412, + 472 + ], + "spans": [ + { + "bbox": [ + 198, + 455, + 412, + 472 + ], + "score": 0.88, + "content": "\\begin{array} { r } { \\widetilde { \\log p } _ { \\Theta } ( \\vec { x } , \\vec { z } ) = - \\| \\vec { x } - \\vec { \\mu } ( \\vec { z } , W ) \\| ^ { 2 } - 2 \\sigma ^ { 2 } \\sum _ { h } \\widetilde { \\pi } _ { h } z _ { h } } \\end{array}", + "type": "interline_equation", + "image_path": "ac24f96e6a022cc22fd5e5dd2a9e577ee8ad0f9f641cc5b4a9146788615e6a74.jpg" + } + ] + } + ], + "index": 26, + "virtual_lines": [ + { + "bbox": [ + 198, + 455, + 412, + 472 + ], + "spans": [], + "index": 26 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 476, + 505, + 501 + ], + "lines": [ + { + "bbox": [ + 106, + 475, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 475, + 133, + 490 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 134, + 475, + 235, + 489 + ], + "score": 0.91, + "content": "\\tilde { \\pi } _ { h } = \\log \\left( ( 1 - \\pi _ { h } ) / \\pi _ { h } \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 235, + 475, + 506, + 490 + ], + "score": 1.0, + "content": ". The expression assumes an even more familiar form if we restrict", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 488, + 456, + 503 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 266, + 503 + ], + "score": 1.0, + "content": "ourselves for a moment to sparse priors", + "type": "text" + }, + { + "bbox": [ + 266, + 488, + 293, + 502 + ], + "score": 0.93, + "content": "\\pi < { \\frac { 1 } { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 488, + 313, + 503 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + }, + { + "bbox": [ + 314, + 489, + 339, + 500 + ], + "score": 0.88, + "content": "\\tilde { \\pi } > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 488, + 456, + 503 + ], + "score": 1.0, + "content": ". 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Such functions are routinely encountered in sparse coding or compressive", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 538, + 505, + 555 + ], + "spans": [ + { + "bbox": [ + 105, + 541, + 299, + 554 + ], + "score": 1.0, + "content": "sensing (Eldar & Kutyniok, 2012): for each set", + "type": "text" + }, + { + "bbox": [ + 300, + 538, + 318, + 552 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 319, + 541, + 404, + 555 + ], + "score": 1.0, + "content": "we seek those states", + "type": "text" + }, + { + "bbox": [ + 405, + 542, + 412, + 551 + ], + "score": 0.83, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 541, + 505, + 555 + ], + "score": 1.0, + "content": "that are reconstructing", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 550, + 506, + 568 + ], + "spans": [ + { + "bbox": [ + 106, + 552, + 126, + 564 + ], + "score": 0.9, + "content": "\\vec { x } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 550, + 229, + 568 + ], + "score": 1.0, + "content": "well while being sparse", + "type": "text" + }, + { + "bbox": [ + 230, + 554, + 237, + 564 + ], + "score": 0.78, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 550, + 383, + 568 + ], + "score": 1.0, + "content": "with few non-zero bits). 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Furthermore, criteria like (10) usually emerge for maximum a-posteriori (MAP)", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 586, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 105, + 586, + 505, + 599 + ], + "score": 1.0, + "content": "training in sparse coding (Olshausen & Field, 1996). In contrast, we here seek a population of states", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 597, + 506, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 599, + 113, + 610 + ], + "score": 0.47, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 599, + 124, + 612 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 124, + 597, + 142, + 610 + ], + "score": 0.87, + "content": "\\Phi ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 597, + 506, + 615 + ], + "score": 1.0, + "content": "for each data point. It is a consequence of the reformulated lower bound (7) that it remains", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "score": 1.0, + "content": "optimal to evaluate joint probabilities (as for MAP) although the constructed population of states", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 622, + 369, + 637 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 126, + 634 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 624, + 369, + 637 + ], + "score": 1.0, + "content": "can capture (unlike MAP training) a rich posterior structure.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 106, + 641, + 505, + 702 + ], + "lines": [ + { + "bbox": [ + 104, + 641, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 104, + 642, + 208, + 656 + ], + "score": 1.0, + "content": "But how can new states", + "type": "text" + }, + { + "bbox": [ + 208, + 644, + 230, + 654 + ], + "score": 0.89, + "content": "{ \\vec { z } } ^ { \\mathrm { n e w } }", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 642, + 289, + 656 + ], + "score": 1.0, + "content": "that optimize", + "type": "text" + }, + { + "bbox": [ + 290, + 641, + 309, + 654 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 642, + 505, + 656 + ], + "score": 1.0, + "content": "be found efficiently in high-dimensional latent", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 654, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 505, + 667 + ], + "score": 1.0, + "content": "spaces? Random search and search by sampling has recently been explored for elementary gener-", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "score": 1.0, + "content": "ative models (Lucke et al., 2018). Here we will follow another recent suggestion (Guiraud et al., ¨", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "score": 1.0, + "content": "2018) and make use of a search based on evolutionary algorithms (EAs). In this setting we interpret", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 104, + 687, + 454, + 703 + ], + "spans": [ + { + "bbox": [ + 104, + 689, + 124, + 701 + ], + "score": 1.0, + "content": "sets", + "type": "text" + }, + { + "bbox": [ + 124, + 687, + 143, + 700 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 690, + 281, + 703 + ], + "score": 1.0, + "content": "as populations of binary genomes", + "type": "text" + }, + { + "bbox": [ + 281, + 690, + 288, + 700 + ], + "score": 0.78, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 690, + 454, + 703 + ], + "score": 1.0, + "content": "and base the fitness function on Eqn. (9).", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 107, + 708, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 104, + 707, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 104, + 707, + 179, + 723 + ], + "score": 1.0, + "content": "Concretely, using", + "type": "text" + }, + { + "bbox": [ + 179, + 707, + 198, + 720 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 707, + 506, + 723 + ], + "score": 1.0, + "content": "as initial parent pool, we apply the following genetic operators in sequence:", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 720, + 505, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 223, + 734 + ], + "score": 1.0, + "content": "firstly, parent selection picks", + "type": "text" + }, + { + "bbox": [ + 224, + 721, + 237, + 733 + ], + "score": 0.88, + "content": "N _ { p }", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 720, + 505, + 734 + ], + "score": 1.0, + "content": "states from the parent pool. 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The expression assumes an even more familiar form if we restrict", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 488, + 456, + 503 + ], + "spans": [ + { + "bbox": [ + 106, + 488, + 266, + 503 + ], + "score": 1.0, + "content": "ourselves for a moment to sparse priors", + "type": "text" + }, + { + "bbox": [ + 266, + 488, + 293, + 502 + ], + "score": 0.93, + "content": "\\pi < { \\frac { 1 } { 2 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 293, + 488, + 313, + 503 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + }, + { + "bbox": [ + 314, + 489, + 339, + 500 + ], + "score": 0.88, + "content": "\\tilde { \\pi } > 0", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 488, + 456, + 503 + ], + "score": 1.0, + "content": ". 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Such functions are routinely encountered in sparse coding or compressive", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 538, + 505, + 555 + ], + "spans": [ + { + "bbox": [ + 105, + 541, + 299, + 554 + ], + "score": 1.0, + "content": "sensing (Eldar & Kutyniok, 2012): for each set", + "type": "text" + }, + { + "bbox": [ + 300, + 538, + 318, + 552 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 319, + 541, + 404, + 555 + ], + "score": 1.0, + "content": "we seek those states", + "type": "text" + }, + { + "bbox": [ + 405, + 542, + 412, + 551 + ], + "score": 0.83, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 412, + 541, + 505, + 555 + ], + "score": 1.0, + "content": "that are reconstructing", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 550, + 506, + 568 + ], + "spans": [ + { + "bbox": [ + 106, + 552, + 126, + 564 + ], + "score": 0.9, + "content": "\\vec { x } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 550, + 229, + 568 + ], + "score": 1.0, + "content": "well while being sparse", + "type": "text" + }, + { + "bbox": [ + 230, + 554, + 237, + 564 + ], + "score": 0.78, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 550, + 383, + 568 + ], + "score": 1.0, + "content": "with few non-zero bits). 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Furthermore, criteria like (10) usually emerge for maximum a-posteriori (MAP)", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 586, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 105, + 586, + 505, + 599 + ], + "score": 1.0, + "content": "training in sparse coding (Olshausen & Field, 1996). In contrast, we here seek a population of states", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 597, + 506, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 599, + 113, + 610 + ], + "score": 0.47, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 599, + 124, + 612 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 124, + 597, + 142, + 610 + ], + "score": 0.87, + "content": "\\Phi ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 143, + 597, + 506, + 615 + ], + "score": 1.0, + "content": "for each data point. It is a consequence of the reformulated lower bound (7) that it remains", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "spans": [ + { + "bbox": [ + 105, + 611, + 505, + 623 + ], + "score": 1.0, + "content": "optimal to evaluate joint probabilities (as for MAP) although the constructed population of states", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 622, + 369, + 637 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 126, + 634 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 126, + 624, + 369, + 637 + ], + "score": 1.0, + "content": "can capture (unlike MAP training) a rich posterior structure.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 34, + "bbox_fs": [ + 104, + 524, + 507, + 637 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 641, + 505, + 702 + ], + "lines": [ + { + "bbox": [ + 104, + 641, + 505, + 656 + ], + "spans": [ + { + "bbox": [ + 104, + 642, + 208, + 656 + ], + "score": 1.0, + "content": "But how can new states", + "type": "text" + }, + { + "bbox": [ + 208, + 644, + 230, + 654 + ], + "score": 0.89, + "content": "{ \\vec { z } } ^ { \\mathrm { n e w } }", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 642, + 289, + 656 + ], + "score": 1.0, + "content": "that optimize", + "type": "text" + }, + { + "bbox": [ + 290, + 641, + 309, + 654 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 309, + 642, + 505, + 656 + ], + "score": 1.0, + "content": "be found efficiently in high-dimensional latent", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 654, + 505, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 505, + 667 + ], + "score": 1.0, + "content": "spaces? Random search and search by sampling has recently been explored for elementary gener-", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 505, + 678 + ], + "score": 1.0, + "content": "ative models (Lucke et al., 2018). Here we will follow another recent suggestion (Guiraud et al., ¨", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 505, + 689 + ], + "score": 1.0, + "content": "2018) and make use of a search based on evolutionary algorithms (EAs). 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(9).", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 41, + "bbox_fs": [ + 104, + 641, + 505, + 703 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 708, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 104, + 707, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 104, + 707, + 179, + 723 + ], + "score": 1.0, + "content": "Concretely, using", + "type": "text" + }, + { + "bbox": [ + 179, + 707, + 198, + 720 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 707, + 506, + 723 + ], + "score": 1.0, + "content": "as initial parent pool, we apply the following genetic operators in sequence:", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 720, + 505, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 223, + 734 + ], + "score": 1.0, + "content": "firstly, parent selection picks", + "type": "text" + }, + { + "bbox": [ + 224, + 721, + 237, + 733 + ], + "score": 0.88, + "content": "N _ { p }", + "type": "inline_equation" + }, + { + "bbox": [ + 237, + 720, + 505, + 734 + ], + "score": 1.0, + "content": "states from the parent pool. 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A. Some states are selected as", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 306, + 123, + 487, + 135 + ], + "spans": [ + { + "bbox": [ + 306, + 123, + 487, + 135 + ], + "score": 1.0, + "content": "parents. B. Each child undergoes mutation.", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 306, + 134, + 488, + 146 + ], + "spans": [ + { + "bbox": [ + 306, + 134, + 488, + 146 + ], + "score": 1.0, + "content": "C. 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Each of the children undergoes mutation: one or", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 190, + 505, + 203 + ], + "spans": [ + { + "bbox": [ + 105, + 190, + 505, + 203 + ], + "score": 1.0, + "content": "more bits are flipped to further increase offspring diversity. In our experiments we perform random", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 200, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 106, + 200, + 505, + 213 + ], + "score": 1.0, + "content": "uniform selection of the bits to flip. Crossover could also be employed to increase offspring diversity.", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 212, + 506, + 225 + ], + "spans": [ + { + "bbox": [ + 106, + 212, + 506, + 225 + ], + "score": 1.0, + "content": "We repeat the procedure using the children generated this way as the parent pool, giving birth to", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 222, + 505, + 238 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 353, + 238 + ], + "score": 1.0, + "content": "multiple generations of candidate states. Finally, we update", + "type": "text" + }, + { + "bbox": [ + 353, + 222, + 372, + 235 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 223, + 505, + 238 + ], + "score": 1.0, + "content": "by substituting individuals with", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 234, + 505, + 250 + ], + "spans": [ + { + "bbox": [ + 104, + 234, + 505, + 250 + ], + "score": 1.0, + "content": "low fitness with candidates with higher fitness. The whole procedure can be seen as an evolutionary", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 246, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 246, + 506, + 261 + ], + "score": 1.0, + "content": "algorithm with perfect memory or very strong elitism (individuals with higher fitness never drop out", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 256, + 506, + 272 + ], + "spans": [ + { + "bbox": [ + 105, + 256, + 506, + 272 + ], + "score": 1.0, + "content": "of the gene pool). Note that the improvement of the variational lower bound depends on generating", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 267, + 437, + 283 + ], + "spans": [ + { + "bbox": [ + 104, + 267, + 437, + 283 + ], + "score": 1.0, + "content": "as many as possible different children with high fitness over the course of training.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 15.5 + }, + { + "type": "text", + "bbox": [ + 106, + 286, + 505, + 349 + ], + "lines": [ + { + "bbox": [ + 104, + 285, + 505, + 300 + ], + "spans": [ + { + "bbox": [ + 104, + 286, + 276, + 300 + ], + "score": 1.0, + "content": "We point out that the EAs optimize each", + "type": "text" + }, + { + "bbox": [ + 277, + 285, + 295, + 298 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 296, + 286, + 505, + 300 + ], + "score": 1.0, + "content": "independently, so this technique can be applied to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 299, + 505, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 299, + 492, + 311 + ], + "score": 1.0, + "content": "large datasets in conjunction with stochastic or batch gradient descent on the model parameters", + "type": "text" + }, + { + "bbox": [ + 492, + 299, + 501, + 309 + ], + "score": 0.75, + "content": "\\Theta", + "type": "inline_equation" + }, + { + "bbox": [ + 501, + 299, + 505, + 311 + ], + "score": 1.0, + "content": ":", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 310, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 104, + 311, + 320, + 326 + ], + "score": 1.0, + "content": "it does not require to keep the full dataset (or all sets", + "type": "text" + }, + { + "bbox": [ + 320, + 310, + 339, + 323 + ], + "score": 0.88, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 339, + 311, + 506, + 326 + ], + "score": 1.0, + "content": ") in memory at a given time. Fig 1 shows", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 322, + 506, + 339 + ], + "spans": [ + { + "bbox": [ + 104, + 322, + 354, + 339 + ], + "score": 1.0, + "content": "how EAs produce new states that are used to update each set", + "type": "text" + }, + { + "bbox": [ + 354, + 323, + 373, + 336 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 322, + 506, + 339 + ], + "score": 1.0, + "content": ". 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Fig 1 shows", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 322, + 506, + 339 + ], + "spans": [ + { + "bbox": [ + 104, + 322, + 354, + 339 + ], + "score": 1.0, + "content": "how EAs produce new states that are used to update each set", + "type": "text" + }, + { + "bbox": [ + 354, + 323, + 373, + 336 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 322, + 506, + 339 + ], + "score": 1.0, + "content": ". 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After first verify-", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 105, + 610, + 505, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 505, + 622 + ], + "score": 1.0, + "content": "ing that the procedure can recover generating parameters using ground-truth data (see Appendix B),", + "type": "text" + } + ], + "index": 55 + }, + { + "bbox": [ + 105, + 621, + 410, + 634 + ], + "spans": [ + { + "bbox": [ + 105, + 621, + 410, + 634 + ], + "score": 1.0, + "content": "we conducted experiments to address the following two standard questions:", + "type": "text" + } + ], + "index": 56 + } + ], + "index": 55, + "bbox_fs": [ + 105, + 598, + 505, + 634 + ] + }, + { + "type": "text", + "bbox": [ + 104, + 637, + 464, + 660 + ], + "lines": [ + { + "bbox": [ + 106, + 637, + 455, + 650 + ], + "spans": [ + { + "bbox": [ + 106, + 637, + 455, + 650 + ], + "score": 1.0, + "content": "(1) How efficient, i.e. how scalable, is the direct discrete optimization of binary VAEs?", + "type": "text" + } + ], + "index": 57 + }, + { + "bbox": [ + 106, + 649, + 465, + 662 + ], + "spans": [ + { + "bbox": [ + 106, + 649, + 465, + 662 + ], + "score": 1.0, + "content": "(2) How effective is the procedure, i.e., how well does it perform for a given VAE model?", + "type": "text" + } + ], + "index": 58 + } + ], + "index": 57.5, + "bbox_fs": [ + 106, + 637, + 465, + 662 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 666, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 666, + 505, + 677 + ], + "spans": [ + { + "bbox": [ + 106, + 666, + 505, + 677 + ], + "score": 1.0, + "content": "In all numerical experiments, the training of the DNN parameters based on (4) is performed with", + "type": "text" + } + ], + "index": 59 + }, + { + "bbox": [ + 105, + 677, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 505, + 690 + ], + "score": 1.0, + "content": "mini-batches, the Adam optimizer (Kingma & Ba, 2014) and decaying or cyclical learning rate", + "type": "text" + } + ], + "index": 60 + }, + { + "bbox": [ + 105, + 687, + 505, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 354, + 700 + ], + "score": 1.0, + "content": "scheduling (Smith, 2017). 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g=15g=25g=50
MTMKL34.2931.8828.08
GSC32.6831.1028.02
VAR-BSC32.2531.1528.62
TVAE34.27 ± .0232.65 ± .0629.61± .02
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We will refer to the binary VAE trained", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 183, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 106, + 183, + 505, + 196 + ], + "score": 1.0, + "content": "with the method described above as Truncated Variational Autoencoder (TVAE) as the use of trun-", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 195, + 310, + 207 + ], + "spans": [ + { + "bbox": [ + 106, + 195, + 310, + 207 + ], + "score": 1.0, + "content": "cated posteriors is the main distinguishing feature.", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 106, + 212, + 505, + 278 + ], + "lines": [ + { + "bbox": [ + 105, + 210, + 505, + 225 + ], + "spans": [ + { + "bbox": [ + 105, + 210, + 505, + 225 + ], + "score": 1.0, + "content": "Scalability and improvement on linear models. Let us first numerically investigate scalability", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 222, + 505, + 237 + ], + "spans": [ + { + "bbox": [ + 104, + 222, + 505, + 237 + ], + "score": 1.0, + "content": "properties of TVAE especially in comparison with linear models. After verifying parameter recovery", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 233, + 506, + 246 + ], + "spans": [ + { + "bbox": [ + 105, + 233, + 506, + 246 + ], + "score": 1.0, + "content": "for ground-truth data (see Appendix B), we used natural data in the form of image patches as an", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 245, + 505, + 258 + ], + "spans": [ + { + "bbox": [ + 105, + 245, + 505, + 258 + ], + "score": 1.0, + "content": "intermediately large scale and natural dataset. 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For standard", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 294, + 506, + 308 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 506, + 308 + ], + "score": 1.0, + "content": "Gaussian latents, a linear VAE can recover probabilistic PCA solutions (e.g. Lucas et al., 2019). For", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 306, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 105, + 306, + 505, + 318 + ], + "score": 1.0, + "content": "Bernoulli latents, we would recover binary sparse coding (Haft et al., 2004; Shelton et al., 2011)", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 316, + 505, + 329 + ], + "spans": [ + { + "bbox": [ + 105, + 316, + 284, + 329 + ], + "score": 1.0, + "content": "solutions. We therefore start training (using", + "type": "text" + }, + { + "bbox": [ + 284, + 317, + 324, + 327 + ], + "score": 0.9, + "content": "H = 3 0 0", + "type": "inline_equation" + }, + { + "bbox": [ + 324, + 316, + 505, + 329 + ], + "score": 1.0, + "content": "latents) with a linear VAE. 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The weights of the deeper layers", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "score": 1.0, + "content": "were simply initialized to the identity matrix. Furthermore, prior and variance were optimized.", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "score": 1.0, + "content": "The described setup guarantees a common starting point for linear and non-linear VAEs such that", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 371, + 505, + 384 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 505, + 384 + ], + "score": 1.0, + "content": "the difference provided by deeper decoder DNNs can be highlighted. Fig. 3 shows the variational", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 382, + 505, + 395 + ], + "spans": [ + { + "bbox": [ + 105, + 382, + 505, + 395 + ], + "score": 1.0, + "content": "bounds during learning of the linear VAE compared to the non-linear VAE for a typical experiment.", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 392, + 505, + 406 + ], + "spans": [ + { + "bbox": [ + 105, + 392, + 505, + 406 + ], + "score": 1.0, + "content": "The non-linear VAE can be observed to quickly and significantly optimize the lower bound beyond", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 404, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 104, + 404, + 505, + 417 + ], + "score": 1.0, + "content": "a linear VAE. We will later (when we are not interested in comparisons to linear VAEs) simply", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 415, + 506, + 428 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 506, + 428 + ], + "score": 1.0, + "content": "optimize the weights of non-linear TVAE directly as we did not observed an advantage by first", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 426, + 208, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 208, + 438 + ], + "score": 1.0, + "content": "optimizing a linear VAE.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 24.5 + }, + { + "type": "image", + "bbox": [ + 306, + 460, + 503, + 531 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 306, + 460, + 503, + 531 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 306, + 460, + 503, + 531 + ], + "spans": [ + { + "bbox": [ + 306, + 460, + 503, + 531 + ], + "score": 0.964, + "type": "image", + "image_path": "be5972d41617605cdac7f1e82da43139d1803097042d0f2204b119824795367a.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 306, + 460, + 503, + 474.2 + ], + "spans": [], + "index": 38 + }, + { + "bbox": [ + 306, + 474.2, + 503, + 488.4 + ], + "spans": [], + "index": 39 + }, + { + "bbox": [ + 306, + 488.4, + 503, + 502.59999999999997 + ], + "spans": [], + "index": 40 + }, + { + "bbox": [ + 306, + 502.59999999999997, + 503, + 516.8 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 306, + 516.8, + 503, + 531.0 + ], + "spans": [], + "index": 42 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 549, + 287, + 582 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 106, + 548, + 288, + 561 + ], + "spans": [ + { + "bbox": [ + 106, + 548, + 288, + 561 + ], + "score": 1.0, + "content": "Figure 3: ELBO gain of TVAE compared to", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 559, + 286, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 251, + 572 + ], + "score": 1.0, + "content": "linear VAE with binary latents (on", + "type": "text" + }, + { + "bbox": [ + 252, + 560, + 286, + 570 + ], + "score": 0.89, + "content": "1 6 \\times 1 6", + "type": "inline_equation" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 570, + 172, + 583 + ], + "spans": [ + { + "bbox": [ + 106, + 570, + 172, + 583 + ], + "score": 1.0, + "content": "image patches).", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 44 + }, + { + "type": "image_caption", + "bbox": [ + 304, + 544, + 504, + 577 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 304, + 543, + 505, + 556 + ], + "spans": [ + { + "bbox": [ + 304, + 543, + 505, + 556 + ], + "score": 1.0, + "content": "Figure 4: TVAE denoising of house image with", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 303, + 554, + 505, + 567 + ], + "spans": [ + { + "bbox": [ + 303, + 554, + 353, + 567 + ], + "score": 1.0, + "content": "noise level", + "type": "text" + }, + { + "bbox": [ + 353, + 555, + 391, + 565 + ], + "score": 0.89, + "content": "\\sigma ~ = ~ 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 554, + 505, + 567 + ], + "score": 1.0, + "content": ". The denoised image has", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 304, + 564, + 480, + 578 + ], + "spans": [ + { + "bbox": [ + 304, + 566, + 358, + 576 + ], + "score": 0.67, + "content": "\\mathrm { P S N R } { = } 3 0 . 0 3", + "type": "inline_equation" + }, + { + "bbox": [ + 359, + 564, + 480, + 578 + ], + "score": 1.0, + "content": ", the best of the runs of Tab. 2.", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 47 + } + ], + "index": 44 + }, + { + "type": "text", + "bbox": [ + 106, + 586, + 505, + 704 + ], + "lines": [ + { + "bbox": [ + 106, + 586, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 106, + 586, + 505, + 599 + ], + "score": 1.0, + "content": "Compared to shallow linear models, we observed a similar efficiency and scalability of TVAE. The", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 106, + 597, + 505, + 610 + ], + "spans": [ + { + "bbox": [ + 106, + 597, + 505, + 610 + ], + "score": 1.0, + "content": "main additional computational costs are given by passing the latent states through the a full decoder", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 607, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 506, + 622 + ], + "score": 1.0, + "content": "DNN instead of just through a linear mapping. 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This", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 632, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 159, + 646 + ], + "score": 1.0, + "content": "compares to", + "type": "text" + }, + { + "bbox": [ + 159, + 633, + 194, + 644 + ], + "score": 0.91, + "content": "N \\times M", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 632, + 441, + 646 + ], + "score": 1.0, + "content": "states that would be used for standard VAE training (given", + "type": "text" + }, + { + "bbox": [ + 441, + 633, + 453, + 643 + ], + "score": 0.71, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 453, + 632, + 506, + 646 + ], + "score": 1.0, + "content": "samples are", + "type": "text" + } + ], + "index": 53 + }, + { + "bbox": [ + 104, + 642, + 507, + 660 + ], + "spans": [ + { + "bbox": [ + 104, + 642, + 361, + 660 + ], + "score": 1.0, + "content": "drawn per data point). Differently to standard VAE training the", + "type": "text" + }, + { + "bbox": [ + 361, + 644, + 380, + 656 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 642, + 507, + 660 + ], + "score": 1.0, + "content": "have to be remembered across", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 103, + 657, + 506, + 673 + ], + "spans": [ + { + "bbox": [ + 103, + 657, + 309, + 673 + ], + "score": 1.0, + "content": "iterations. For very large datasets, the additional", + "type": "text" + }, + { + "bbox": [ + 310, + 657, + 384, + 672 + ], + "score": 0.93, + "content": "\\mathcal { O } ( N \\times | \\Phi ^ { ( n ) } | \\times H )", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 657, + 506, + 673 + ], + "score": 1.0, + "content": "memory demand can be dis-", + "type": "text" + } + ], + "index": 55 + }, + { + "bbox": [ + 105, + 671, + 504, + 683 + ], + "spans": [ + { + "bbox": [ + 105, + 671, + 468, + 683 + ], + "score": 1.0, + "content": "tributed over compute nodes, however. To further investigate scalability, we went to up to", + "type": "text" + }, + { + "bbox": [ + 468, + 671, + 504, + 681 + ], + "score": 0.88, + "content": "H { = } 1 0 0 0", + "type": "inline_equation" + } + ], + "index": 56 + }, + { + "bbox": [ + 105, + 681, + 505, + 693 + ], + "spans": [ + { + "bbox": [ + 105, + 681, + 505, + 693 + ], + "score": 1.0, + "content": "latent variables (while using 100 units in the DNN middle layer). TVAE training time remained in", + "type": "text" + } + ], + "index": 57 + }, + { + "bbox": [ + 106, + 692, + 475, + 704 + ], + "spans": [ + { + "bbox": [ + 106, + 692, + 280, + 704 + ], + "score": 1.0, + "content": "line with the theoretical linear scaling with", + "type": "text" + }, + { + "bbox": [ + 280, + 695, + 289, + 703 + ], + "score": 0.88, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 290, + 692, + 475, + 704 + ], + "score": 1.0, + "content": "while the variational bound further increased.", + "type": "text" + } + ], + "index": 58 + } + ], + "index": 53.5 + }, + { + "type": "text", + "bbox": [ + 106, + 709, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 708, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 505, + 722 + ], + "score": 1.0, + "content": "Effectiveness: Image Denoising. As we have observed, scaling to large latent spaces does not pose", + "type": "text" + } + ], + "index": 59 + }, + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "score": 1.0, + "content": "a problem for the presented approach. 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g=15g=25g=50
MTMKL34.2931.8828.08
GSC32.6831.1028.02
VAR-BSC32.2531.1528.62
TVAE34.27 ± .0232.65 ± .0629.61± .02
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Let us first numerically investigate scalability", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 222, + 505, + 237 + ], + "spans": [ + { + "bbox": [ + 104, + 222, + 505, + 237 + ], + "score": 1.0, + "content": "properties of TVAE especially in comparison with linear models. After verifying parameter recovery", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 233, + 506, + 246 + ], + "spans": [ + { + "bbox": [ + 105, + 233, + 506, + 246 + ], + "score": 1.0, + "content": "for ground-truth data (see Appendix B), we used natural data in the form of image patches as an", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 245, + 505, + 258 + ], + "spans": [ + { + "bbox": [ + 105, + 245, + 505, + 258 + ], + "score": 1.0, + "content": "intermediately large scale and natural dataset. Concretely, we used 100,000 whitened image patches", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 255, + 505, + 268 + ], + "spans": [ + { + "bbox": [ + 106, + 255, + 118, + 268 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 118, + 256, + 152, + 267 + ], + "score": 0.9, + "content": "1 6 \\times 1 6", + "type": "inline_equation" + }, + { + "bbox": [ + 152, + 255, + 505, + 268 + ], + "score": 1.0, + "content": "pixels extracted from a standard image database (van Hateren & van der Schaaf, 1998)", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 267, + 290, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 267, + 290, + 279 + ], + "score": 1.0, + "content": "and pre-processed as in Guiraud et al. (2018).", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 14.5, + "bbox_fs": [ + 104, + 210, + 506, + 279 + ] + }, + { + "type": "image", + "bbox": [ + 108, + 457, + 282, + 536 + ], + "blocks": [ + { + "type": "image_caption", + "bbox": [ + 106, + 79, + 227, + 135 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 78, + 228, + 92 + ], + "spans": [ + { + "bbox": [ + 105, + 78, + 228, + 92 + ], + "score": 1.0, + "content": "Table 1: Denoising perfor-", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 89, + 228, + 102 + ], + "spans": [ + { + "bbox": [ + 105, + 89, + 228, + 102 + ], + "score": 1.0, + "content": "mance in PSNR (dB) for", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 100, + 228, + 114 + ], + "spans": [ + { + "bbox": [ + 105, + 100, + 228, + 114 + ], + "score": 1.0, + "content": "the ‘house’ image under con-", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 111, + 228, + 124 + ], + "spans": [ + { + "bbox": [ + 106, + 111, + 190, + 124 + ], + "score": 1.0, + "content": "trolled conditions", + "type": "text" + }, + { + "bbox": [ + 190, + 113, + 225, + 123 + ], + "score": 0.88, + "content": "\\scriptstyle { \\mathcal { D } } = 8 \\times 8", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 111, + 228, + 124 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 121, + 212, + 136 + ], + "spans": [ + { + "bbox": [ + 106, + 123, + 133, + 134 + ], + "score": 0.86, + "content": "H { = } 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 121, + 212, + 136 + ], + "score": 1.0, + "content": "for all algorithms).", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 2 + }, + { + "type": "image_body", + "bbox": [ + 108, + 457, + 282, + 536 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 108, + 457, + 282, + 536 + ], + "spans": [ + { + "bbox": [ + 108, + 457, + 282, + 536 + ], + "score": 0.961, + "type": "image", + "image_path": "a89cb8777ccb03c1af036831a57ce347819b931b4fcc37a3ff12df3f99e95270.jpg" + } + ] + } + ], + "index": 34.5, + "virtual_lines": [ + { + "bbox": [ + 108, + 457, + 282, + 470.1666666666667 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 108, + 470.1666666666667, + 282, + 483.33333333333337 + ], + "spans": [], + "index": 33 + }, + { + "bbox": [ + 108, + 483.33333333333337, + 282, + 496.50000000000006 + ], + "spans": [], + "index": 34 + }, + { + "bbox": [ + 108, + 496.50000000000006, + 282, + 509.66666666666674 + ], + "spans": [], + "index": 35 + }, + { + "bbox": [ + 108, + 509.66666666666674, + 282, + 522.8333333333334 + ], + "spans": [], + "index": 36 + }, + { + "bbox": [ + 108, + 522.8333333333334, + 282, + 536.0 + ], + "spans": [], + "index": 37 + } + ] + } + ], + "index": 18.25 + }, + { + "type": "text", + "bbox": [ + 106, + 284, + 505, + 437 + ], + "lines": [ + { + "bbox": [ + 105, + 283, + 506, + 297 + ], + "spans": [ + { + "bbox": [ + 105, + 283, + 407, + 297 + ], + "score": 1.0, + "content": "The simplest possible VAEs would use linear mappings for the decoder", + "type": "text" + }, + { + "bbox": [ + 408, + 284, + 443, + 296 + ], + "score": 0.93, + "content": "\\vec { \\mu } ( \\vec { z } , W )", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 283, + 506, + 297 + ], + "score": 1.0, + "content": ". For standard", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 294, + 506, + 308 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 506, + 308 + ], + "score": 1.0, + "content": "Gaussian latents, a linear VAE can recover probabilistic PCA solutions (e.g. Lucas et al., 2019). For", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 306, + 505, + 318 + ], + "spans": [ + { + "bbox": [ + 105, + 306, + 505, + 318 + ], + "score": 1.0, + "content": "Bernoulli latents, we would recover binary sparse coding (Haft et al., 2004; Shelton et al., 2011)", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 316, + 505, + 329 + ], + "spans": [ + { + "bbox": [ + 105, + 316, + 284, + 329 + ], + "score": 1.0, + "content": "solutions. We therefore start training (using", + "type": "text" + }, + { + "bbox": [ + 284, + 317, + 324, + 327 + ], + "score": 0.9, + "content": "H = 3 0 0", + "type": "inline_equation" + }, + { + "bbox": [ + 324, + 316, + 505, + 329 + ], + "score": 1.0, + "content": "latents) with a linear VAE. After 100 epochs", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 327, + 506, + 340 + ], + "spans": [ + { + "bbox": [ + 106, + 327, + 506, + 340 + ], + "score": 1.0, + "content": "the weights of the linear mapping were used to initialize the bottom layer of a deeper decoder", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 338, + 505, + 352 + ], + "spans": [ + { + "bbox": [ + 105, + 338, + 279, + 352 + ], + "score": 1.0, + "content": "network with three layers of 300, 300 and", + "type": "text" + }, + { + "bbox": [ + 279, + 339, + 343, + 349 + ], + "score": 0.91, + "content": "1 6 \\times 1 6 = 2 5 6", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 338, + 505, + 352 + ], + "score": 1.0, + "content": "units. The weights of the deeper layers", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "spans": [ + { + "bbox": [ + 105, + 349, + 506, + 362 + ], + "score": 1.0, + "content": "were simply initialized to the identity matrix. Furthermore, prior and variance were optimized.", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "score": 1.0, + "content": "The described setup guarantees a common starting point for linear and non-linear VAEs such that", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 371, + 505, + 384 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 505, + 384 + ], + "score": 1.0, + "content": "the difference provided by deeper decoder DNNs can be highlighted. Fig. 3 shows the variational", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 382, + 505, + 395 + ], + "spans": [ + { + "bbox": [ + 105, + 382, + 505, + 395 + ], + "score": 1.0, + "content": "bounds during learning of the linear VAE compared to the non-linear VAE for a typical experiment.", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 392, + 505, + 406 + ], + "spans": [ + { + "bbox": [ + 105, + 392, + 505, + 406 + ], + "score": 1.0, + "content": "The non-linear VAE can be observed to quickly and significantly optimize the lower bound beyond", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 404, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 104, + 404, + 505, + 417 + ], + "score": 1.0, + "content": "a linear VAE. We will later (when we are not interested in comparisons to linear VAEs) simply", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 415, + 506, + 428 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 506, + 428 + ], + "score": 1.0, + "content": "optimize the weights of non-linear TVAE directly as we did not observed an advantage by first", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 426, + 208, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 208, + 438 + ], + "score": 1.0, + "content": "optimizing a linear VAE.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 24.5, + "bbox_fs": [ + 104, + 283, + 506, + 438 + ] + }, + { + "type": "image", + "bbox": [ + 306, + 460, + 503, + 531 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 306, + 460, + 503, + 531 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 306, + 460, + 503, + 531 + ], + "spans": [ + { + "bbox": [ + 306, + 460, + 503, + 531 + ], + "score": 0.964, + "type": "image", + "image_path": "be5972d41617605cdac7f1e82da43139d1803097042d0f2204b119824795367a.jpg" + } + ] + } + ], + "index": 40, + "virtual_lines": [ + { + "bbox": [ + 306, + 460, + 503, + 474.2 + ], + "spans": [], + "index": 38 + }, + { + "bbox": [ + 306, + 474.2, + 503, + 488.4 + ], + "spans": [], + "index": 39 + }, + { + "bbox": [ + 306, + 488.4, + 503, + 502.59999999999997 + ], + "spans": [], + "index": 40 + }, + { + "bbox": [ + 306, + 502.59999999999997, + 503, + 516.8 + ], + "spans": [], + "index": 41 + }, + { + "bbox": [ + 306, + 516.8, + 503, + 531.0 + ], + "spans": [], + "index": 42 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 549, + 287, + 582 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 106, + 548, + 288, + 561 + ], + "spans": [ + { + "bbox": [ + 106, + 548, + 288, + 561 + ], + "score": 1.0, + "content": "Figure 3: ELBO gain of TVAE compared to", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 559, + 286, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 251, + 572 + ], + "score": 1.0, + "content": "linear VAE with binary latents (on", + "type": "text" + }, + { + "bbox": [ + 252, + 560, + 286, + 570 + ], + "score": 0.89, + "content": "1 6 \\times 1 6", + "type": "inline_equation" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 570, + 172, + 583 + ], + "spans": [ + { + "bbox": [ + 106, + 570, + 172, + 583 + ], + "score": 1.0, + "content": "image patches).", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 44 + }, + { + "type": "image_caption", + "bbox": [ + 304, + 544, + 504, + 577 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 304, + 543, + 505, + 556 + ], + "spans": [ + { + "bbox": [ + 304, + 543, + 505, + 556 + ], + "score": 1.0, + "content": "Figure 4: TVAE denoising of house image with", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 303, + 554, + 505, + 567 + ], + "spans": [ + { + "bbox": [ + 303, + 554, + 353, + 567 + ], + "score": 1.0, + "content": "noise level", + "type": "text" + }, + { + "bbox": [ + 353, + 555, + 391, + 565 + ], + "score": 0.89, + "content": "\\sigma ~ = ~ 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 554, + 505, + 567 + ], + "score": 1.0, + "content": ". The denoised image has", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 304, + 564, + 480, + 578 + ], + "spans": [ + { + "bbox": [ + 304, + 566, + 358, + 576 + ], + "score": 0.67, + "content": "\\mathrm { P S N R } { = } 3 0 . 0 3", + "type": "inline_equation" + }, + { + "bbox": [ + 359, + 564, + 480, + 578 + ], + "score": 1.0, + "content": ", the best of the runs of Tab. 2.", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 47 + } + ], + "index": 44 + }, + { + "type": "text", + "bbox": [ + 106, + 586, + 505, + 704 + ], + "lines": [ + { + "bbox": [ + 106, + 586, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 106, + 586, + 505, + 599 + ], + "score": 1.0, + "content": "Compared to shallow linear models, we observed a similar efficiency and scalability of TVAE. The", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 106, + 597, + 505, + 610 + ], + "spans": [ + { + "bbox": [ + 106, + 597, + 505, + 610 + ], + "score": 1.0, + "content": "main additional computational costs are given by passing the latent states through the a full decoder", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 607, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 506, + 622 + ], + "score": 1.0, + "content": "DNN instead of just through a linear mapping. The sets of states used could be kept small, at size", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 107, + 617, + 508, + 639 + ], + "spans": [ + { + "bbox": [ + 107, + 619, + 177, + 634 + ], + "score": 0.93, + "content": "S = | \\boldsymbol \\Phi ^ { ^ { ( n ) } } | = 6 \\dot { 4 }", + "type": "inline_equation" + }, + { + "bbox": [ + 177, + 617, + 219, + 639 + ], + "score": 1.0, + "content": ", such that", + "type": "text" + }, + { + "bbox": [ + 219, + 619, + 312, + 634 + ], + "score": 0.93, + "content": "N \\times ( | \\Phi ^ { ( n ) } | + | \\bar { \\Phi _ { \\mathrm { n e w } } ^ { ( n ) } } | )", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 617, + 508, + 639 + ], + "score": 1.0, + "content": "states had to be evaluated for each epoch. This", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 632, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 159, + 646 + ], + "score": 1.0, + "content": "compares to", + "type": "text" + }, + { + "bbox": [ + 159, + 633, + 194, + 644 + ], + "score": 0.91, + "content": "N \\times M", + "type": "inline_equation" + }, + { + "bbox": [ + 195, + 632, + 441, + 646 + ], + "score": 1.0, + "content": "states that would be used for standard VAE training (given", + "type": "text" + }, + { + "bbox": [ + 441, + 633, + 453, + 643 + ], + "score": 0.71, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 453, + 632, + 506, + 646 + ], + "score": 1.0, + "content": "samples are", + "type": "text" + } + ], + "index": 53 + }, + { + "bbox": [ + 104, + 642, + 507, + 660 + ], + "spans": [ + { + "bbox": [ + 104, + 642, + 361, + 660 + ], + "score": 1.0, + "content": "drawn per data point). Differently to standard VAE training the", + "type": "text" + }, + { + "bbox": [ + 361, + 644, + 380, + 656 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 642, + 507, + 660 + ], + "score": 1.0, + "content": "have to be remembered across", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 103, + 657, + 506, + 673 + ], + "spans": [ + { + "bbox": [ + 103, + 657, + 309, + 673 + ], + "score": 1.0, + "content": "iterations. For very large datasets, the additional", + "type": "text" + }, + { + "bbox": [ + 310, + 657, + 384, + 672 + ], + "score": 0.93, + "content": "\\mathcal { O } ( N \\times | \\Phi ^ { ( n ) } | \\times H )", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 657, + 506, + 673 + ], + "score": 1.0, + "content": "memory demand can be dis-", + "type": "text" + } + ], + "index": 55 + }, + { + "bbox": [ + 105, + 671, + 504, + 683 + ], + "spans": [ + { + "bbox": [ + 105, + 671, + 468, + 683 + ], + "score": 1.0, + "content": "tributed over compute nodes, however. To further investigate scalability, we went to up to", + "type": "text" + }, + { + "bbox": [ + 468, + 671, + 504, + 681 + ], + "score": 0.88, + "content": "H { = } 1 0 0 0", + "type": "inline_equation" + } + ], + "index": 56 + }, + { + "bbox": [ + 105, + 681, + 505, + 693 + ], + "spans": [ + { + "bbox": [ + 105, + 681, + 505, + 693 + ], + "score": 1.0, + "content": "latent variables (while using 100 units in the DNN middle layer). TVAE training time remained in", + "type": "text" + } + ], + "index": 57 + }, + { + "bbox": [ + 106, + 692, + 475, + 704 + ], + "spans": [ + { + "bbox": [ + 106, + 692, + 280, + 704 + ], + "score": 1.0, + "content": "line with the theoretical linear scaling with", + "type": "text" + }, + { + "bbox": [ + 280, + 695, + 289, + 703 + ], + "score": 0.88, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 290, + 692, + 475, + 704 + ], + "score": 1.0, + "content": "while the variational bound further increased.", + "type": "text" + } + ], + "index": 58 + } + ], + "index": 53.5, + "bbox_fs": [ + 103, + 586, + 508, + 704 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 709, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 708, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 505, + 722 + ], + "score": 1.0, + "content": "Effectiveness: Image Denoising. As we have observed, scaling to large latent spaces does not pose", + "type": "text" + } + ], + "index": 59 + }, + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "score": 1.0, + "content": "a problem for the presented approach. 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These three approaches are based", + "type": "text" + } + ], + "index": 58 + }, + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "score": 1.0, + "content": "on a spike-and-slab sparse coding model (also compare Goodfellow et al., 2012). Despite the less", + "type": "text" + } + ], + "index": 59 + }, + { + "bbox": [ + 105, + 648, + 505, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 505, + 662 + ], + "score": 1.0, + "content": "flexible Bernoulli prior, the decoder DNN of TVAE provides the highest PSNR values for high noise", + "type": "text" + } + ], + "index": 60 + }, + { + "bbox": [ + 105, + 660, + 135, + 672 + ], + "spans": [ + { + "bbox": [ + 105, + 660, + 135, + 672 + ], + "score": 1.0, + "content": "levels.", + "type": "text" + } + ], + "index": 61 + } + ], + "index": 52.5, + "bbox_fs": [ + 104, + 473, + 506, + 672 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 677, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 676, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 506, + 690 + ], + "score": 1.0, + "content": "In order to further extend our comparison, in the last experiment we considered the denoising task", + "type": "text" + } + ], + "index": 62 + }, + { + "bbox": [ + 106, + 687, + 505, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 687, + 505, + 700 + ], + "score": 1.0, + "content": "without controlling for equal conditions. Concretely, we allowed for any approach that performs", + "type": "text" + } + ], + "index": 63 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "denoising on the benchmark including approaches that are trained on large image datasets and/or", + "type": "text" + } + ], + "index": 64 + }, + { + "bbox": [ + 106, + 710, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 710, + 505, + 722 + ], + "score": 1.0, + "content": "use different patch sizes (including multi-scale and whole image processing). Note that different", + "type": "text" + } + ], + "index": 65 + }, + { + "bbox": [ + 106, + 721, + 506, + 734 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 506, + 734 + ], + "score": 1.0, + "content": "approaches may employ very different sets of hyper-parameters that can be optimized for denoising", + "type": "text" + } + ], + "index": 66 + }, + { + "bbox": [ + 105, + 82, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 506, + 96 + ], + "score": 1.0, + "content": "performance: for sparse coding approaches, hyper-parameters include patch and dictionary sizes; for", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "score": 1.0, + "content": "DNN approaches they include all network and training scheme hyper-parameters. By allowing for", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 506, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 506, + 118 + ], + "score": 1.0, + "content": "comparison in this less controlled setting, we can include a number of recent approaches including", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "score": 1.0, + "content": "large DNNs trained on clean data and training schemes specifically targeted to noisy training data.", + "type": "text", + "cross_page": true + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 505, + 138 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 505, + 138 + ], + "score": 1.0, + "content": "Tab. 2 shows the denoising performance for the three noise levels we investigated, with results for", + "type": "text", + "cross_page": true + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "score": 1.0, + "content": "other algorithms taken from their corresponding original publications unless specified otherwise.", + "type": "text", + "cross_page": true + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 148, + 505, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 148, + 505, + 160 + ], + "score": 1.0, + "content": "For WNNM and EPLL we cite values from Zhang et al. (2017). The results reported for noise2void", + "type": "text", + "cross_page": true + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 160, + 441, + 172 + ], + "spans": [ + { + "bbox": [ + 106, + 160, + 441, + 172 + ], + "score": 1.0, + "content": "(n2v, Krull et al., 2019) were produced specifically for this work (see Appendix B).", + "type": "text", + "cross_page": true + } + ], + "index": 7 + } + ], + "index": 64, + "bbox_fs": [ + 105, + 676, + 506, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 171 + ], + "lines": [ + { + "bbox": [ + 105, + 82, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 82, + 506, + 96 + ], + "score": 1.0, + "content": "performance: for sparse coding approaches, hyper-parameters include patch and dictionary sizes; for", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 93, + 506, + 107 + ], + "score": 1.0, + "content": "DNN approaches they include all network and training scheme hyper-parameters. By allowing for", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 506, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 506, + 118 + ], + "score": 1.0, + "content": "comparison in this less controlled setting, we can include a number of recent approaches including", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "spans": [ + { + "bbox": [ + 105, + 114, + 505, + 129 + ], + "score": 1.0, + "content": "large DNNs trained on clean data and training schemes specifically targeted to noisy training data.", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 505, + 138 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 505, + 138 + ], + "score": 1.0, + "content": "Tab. 2 shows the denoising performance for the three noise levels we investigated, with results for", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "score": 1.0, + "content": "other algorithms taken from their corresponding original publications unless specified otherwise.", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 148, + 505, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 148, + 505, + 160 + ], + "score": 1.0, + "content": "For WNNM and EPLL we cite values from Zhang et al. (2017). The results reported for noise2void", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 160, + 441, + 172 + ], + "spans": [ + { + "bbox": [ + 106, + 160, + 441, + 172 + ], + "score": 1.0, + "content": "(n2v, Krull et al., 2019) were produced specifically for this work (see Appendix B).", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 3.5 + }, + { + "type": "text", + "bbox": [ + 107, + 176, + 505, + 352 + ], + "lines": [ + { + "bbox": [ + 105, + 176, + 505, + 189 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 505, + 189 + ], + "score": 1.0, + "content": "Note that the best performing approaches in Tab. 2 cannot be trained on noisy data: EPLL (Zoran", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 187, + 505, + 199 + ], + "spans": [ + { + "bbox": [ + 106, + 187, + 505, + 199 + ], + "score": 1.0, + "content": "& Weiss, 2011), BDGAN (Zhu et al., 2019) and DPDNN (Dong et al., 2019) all make use of clean", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 198, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 505, + 210 + ], + "score": 1.0, + "content": "training data (typically hundreds of thousands of data points or more). For denoising, EPLL also", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 209, + 505, + 221 + ], + "spans": [ + { + "bbox": [ + 105, + 209, + 505, + 221 + ], + "score": 1.0, + "content": "requires the ground-truth noise level of the test image. Ground-truth noise level information is also", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 219, + 505, + 233 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 505, + 233 + ], + "score": 1.0, + "content": "required by KSVD (Elad & Aharon, 2006) and WNNM (Gu et al., 2014). As noisy data is very", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 231, + 505, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 505, + 244 + ], + "score": 1.0, + "content": "frequently occurring, removing the requirement of clean data has been of considerable interest with,", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 242, + 505, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 505, + 255 + ], + "score": 1.0, + "content": "e.g., approaches like noise2noise (n2n, Lehtinen et al., 2018) and noise2void being very actively", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 252, + 505, + 265 + ], + "spans": [ + { + "bbox": [ + 105, + 252, + 505, + 265 + ], + "score": 1.0, + "content": "discussed currently. The n2n approach can achieve denoising performance on noisy training data", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 264, + 505, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 264, + 505, + 277 + ], + "score": 1.0, + "content": "which is almost as high as the performance of a given DNN when trained on clean data. It would", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 275, + 506, + 287 + ], + "spans": [ + { + "bbox": [ + 105, + 275, + 506, + 287 + ], + "score": 1.0, + "content": "thus outperform all approaches in Tab. 2 except for the bottom three. However, n2n requires different", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 286, + 505, + 298 + ], + "spans": [ + { + "bbox": [ + 105, + 286, + 505, + 298 + ], + "score": 1.0, + "content": "noise realizations of the very same underlying image. noise2void aims to remove this artificial", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 297, + 504, + 308 + ], + "spans": [ + { + "bbox": [ + 105, + 297, + 487, + 308 + ], + "score": 1.0, + "content": "assumption. Considering Tab. 2, PSNR values of TVAE were consistently higher than those of", + "type": "text" + }, + { + "bbox": [ + 487, + 297, + 504, + 307 + ], + "score": 0.53, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 307, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 136, + 320 + ], + "score": 1.0, + "content": "even if", + "type": "text" + }, + { + "bbox": [ + 136, + 308, + 153, + 318 + ], + "score": 0.32, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 307, + 374, + 320 + ], + "score": 1.0, + "content": "was trained on external data with matched-noise level", + "type": "text" + }, + { + "bbox": [ + 375, + 307, + 396, + 318 + ], + "score": 0.78, + "content": "( { \\bf n } 2 { \\bf v } ^ { \\dagger }", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 307, + 506, + 320 + ], + "score": 1.0, + "content": "in Tab. 2). Performance of", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 318, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 144, + 331 + ], + "score": 1.0, + "content": "TVAE is", + "type": "text" + }, + { + "bbox": [ + 145, + 319, + 170, + 329 + ], + "score": 0.37, + "content": "0 . 2 \\mathrm { d B }", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 318, + 263, + 331 + ], + "score": 1.0, + "content": "lower than BM3D for", + "type": "text" + }, + { + "bbox": [ + 263, + 319, + 297, + 329 + ], + "score": 0.9, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 318, + 315, + 331 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 316, + 319, + 341, + 329 + ], + "score": 0.38, + "content": "0 . 6 \\mathrm { d B }", + "type": "inline_equation" + }, + { + "bbox": [ + 342, + 318, + 386, + 331 + ], + "score": 1.0, + "content": "higher for", + "type": "text" + }, + { + "bbox": [ + 386, + 319, + 419, + 329 + ], + "score": 0.9, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 318, + 505, + 331 + ], + "score": 1.0, + "content": ", which makes it, for", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 328, + 506, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 328, + 506, + 343 + ], + "score": 1.0, + "content": "large noise levels, the state-of-the-art on this benchmark in the ‘zero-shot’ setting (i.e., the setting", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 340, + 223, + 352 + ], + "spans": [ + { + "bbox": [ + 106, + 340, + 140, + 352 + ], + "score": 1.0, + "content": "n2n and", + "type": "text" + }, + { + "bbox": [ + 141, + 341, + 157, + 351 + ], + "score": 0.45, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 340, + 223, + 352 + ], + "score": 1.0, + "content": "aim to address).", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 15.5 + }, + { + "type": "title", + "bbox": [ + 107, + 368, + 190, + 380 + ], + "lines": [ + { + "bbox": [ + 105, + 366, + 192, + 383 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 192, + 383 + ], + "score": 1.0, + "content": "4 DISCUSSION", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 393, + 505, + 536 + ], + "lines": [ + { + "bbox": [ + 106, + 394, + 505, + 405 + ], + "spans": [ + { + "bbox": [ + 106, + 394, + 505, + 405 + ], + "score": 1.0, + "content": "We investigated a novel way to train VAEs with binary latents. In order to avoid derivatives w.r.t.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 404, + 506, + 417 + ], + "spans": [ + { + "bbox": [ + 105, + 404, + 506, + 417 + ], + "score": 1.0, + "content": "stochastic discrete latents, we here changed the standard training setup substantially. Updates of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 415, + 505, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 505, + 426 + ], + "score": 1.0, + "content": "the decoder DNN now involve a weighted sum over states (4) and the encoder DNN is replaced", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 426, + 506, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 506, + 438 + ], + "score": 1.0, + "content": "by a discrete evolutionary optimization. The direct optimization of the encoder replaces methods", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 437, + 506, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 437, + 506, + 450 + ], + "score": 1.0, + "content": "that are usually considered indispensable for the training of VAEs: sampling approximation and", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 448, + 506, + 461 + ], + "spans": [ + { + "bbox": [ + 105, + 448, + 506, + 461 + ], + "score": 1.0, + "content": "reparameterization trick. Furthermore, the here investigated encoding model does not use a joint", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 459, + 506, + 471 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 506, + 471 + ], + "score": 1.0, + "content": "mapping for all datapoints to latent space, i.e., the approach is not amortized. While amortization", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "spans": [ + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "score": 1.0, + "content": "can be advantageous as information can be shared across datapoints, disadvantages in terms of less", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 480, + 506, + 493 + ], + "spans": [ + { + "bbox": [ + 105, + 480, + 506, + 493 + ], + "score": 1.0, + "content": "tight lower bounds have also been pointed out (e.g. Kim et al., 2018; Cremer et al., 2018). Related", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "to this point, standard VAE training usually involves factored Gaussian approximations of VAE", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 502, + 505, + 515 + ], + "spans": [ + { + "bbox": [ + 105, + 502, + 505, + 515 + ], + "score": 1.0, + "content": "posteriors which can introduce biases (e.g., discussion by Vertes & Sahani, 2018). The investigation ´", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 104, + 513, + 505, + 527 + ], + "spans": [ + { + "bbox": [ + 104, + 513, + 505, + 527 + ], + "score": 1.0, + "content": "of alternatives may therefore, more generally, shed further light on the consequences of specific", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 525, + 320, + 537 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 320, + 537 + ], + "score": 1.0, + "content": "approximation choices used to define VAE encoders.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 31 + }, + { + "type": "text", + "bbox": [ + 107, + 541, + 504, + 629 + ], + "lines": [ + { + "bbox": [ + 105, + 541, + 506, + 555 + ], + "spans": [ + { + "bbox": [ + 105, + 541, + 506, + 555 + ], + "score": 1.0, + "content": "The price we pay for not using amortization is efficiency: we optimize variational parameters for", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 553, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 553, + 506, + 565 + ], + "score": 1.0, + "content": "each data point which is, of course, more costly. However, direct optimization can scale VAEs to", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "score": 1.0, + "content": "large latent spaces if smaller DNNs are used. When the use of large DNNs is anyway prohibitive", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 574, + 505, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 505, + 587 + ], + "score": 1.0, + "content": "because of limited data, the here studied approach can play out its effectiveness. For the recently", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 585, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 506, + 598 + ], + "score": 1.0, + "content": "popular task of ‘zero-shot’ denoising, we observed state-of-the-art results in a domain where VAEs", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 596, + 506, + 608 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 506, + 608 + ], + "score": 1.0, + "content": "have not been reported to be competitive before. The competitive performance is presumably due", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 607, + 506, + 621 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 506, + 621 + ], + "score": 1.0, + "content": "to the approach not being subject to an amortization gap as well as not being based on factored", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 619, + 206, + 630 + ], + "spans": [ + { + "bbox": [ + 106, + 619, + 206, + 630 + ], + "score": 1.0, + "content": "variational distributions.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 41.5 + }, + { + "type": "text", + "bbox": [ + 107, + 635, + 504, + 690 + ], + "lines": [ + { + "bbox": [ + 106, + 635, + 505, + 647 + ], + "spans": [ + { + "bbox": [ + 106, + 635, + 505, + 647 + ], + "score": 1.0, + "content": "Our conclusion is consequently that direct discrete optimization can serve as an alternative for train-", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 646, + 505, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 646, + 505, + 658 + ], + "score": 1.0, + "content": "ing discrete VAEs. In a sense, the approach can be considered as a brute-force optimization which is", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 657, + 505, + 670 + ], + "spans": [ + { + "bbox": [ + 105, + 657, + 505, + 670 + ], + "score": 1.0, + "content": "slower than conventional amortized training but more effective for scales at which it can be applied.", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 666, + 505, + 682 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 682 + ], + "score": 1.0, + "content": "To our knowledge, the approach is also the first training method for VAEs that is not using sampling-", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 678, + 492, + 693 + ], + "spans": [ + { + "bbox": [ + 105, + 678, + 492, + 693 + ], + "score": 1.0, + "content": "based gradient estimates, and the first which makes VAEs competitive for ‘zero-shot’ denoising.", + "type": "text" + } + ], + "index": 50 + } + ], + "index": 48 + } + ], + "page_idx": 7, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 306, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 752, + 308, + 759 + ], + "lines": [ + { + "bbox": [ + 302, + 750, + 309, + 761 + ], + "spans": [ + { + "bbox": [ + 302, + 750, + 309, + 761 + ], + "score": 1.0, + "content": "8", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 171 + ], + "lines": [], + "index": 3.5, + "bbox_fs": [ + 105, + 82, + 506, + 172 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 107, + 176, + 505, + 352 + ], + "lines": [ + { + "bbox": [ + 105, + 176, + 505, + 189 + ], + "spans": [ + { + "bbox": [ + 105, + 176, + 505, + 189 + ], + "score": 1.0, + "content": "Note that the best performing approaches in Tab. 2 cannot be trained on noisy data: EPLL (Zoran", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 187, + 505, + 199 + ], + "spans": [ + { + "bbox": [ + 106, + 187, + 505, + 199 + ], + "score": 1.0, + "content": "& Weiss, 2011), BDGAN (Zhu et al., 2019) and DPDNN (Dong et al., 2019) all make use of clean", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 198, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 505, + 210 + ], + "score": 1.0, + "content": "training data (typically hundreds of thousands of data points or more). 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As noisy data is very", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 231, + 505, + 244 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 505, + 244 + ], + "score": 1.0, + "content": "frequently occurring, removing the requirement of clean data has been of considerable interest with,", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 242, + 505, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 505, + 255 + ], + "score": 1.0, + "content": "e.g., approaches like noise2noise (n2n, Lehtinen et al., 2018) and noise2void being very actively", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 252, + 505, + 265 + ], + "spans": [ + { + "bbox": [ + 105, + 252, + 505, + 265 + ], + "score": 1.0, + "content": "discussed currently. The n2n approach can achieve denoising performance on noisy training data", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 264, + 505, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 264, + 505, + 277 + ], + "score": 1.0, + "content": "which is almost as high as the performance of a given DNN when trained on clean data. It would", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 275, + 506, + 287 + ], + "spans": [ + { + "bbox": [ + 105, + 275, + 506, + 287 + ], + "score": 1.0, + "content": "thus outperform all approaches in Tab. 2 except for the bottom three. 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Considering Tab. 2, PSNR values of TVAE were consistently higher than those of", + "type": "text" + }, + { + "bbox": [ + 487, + 297, + 504, + 307 + ], + "score": 0.53, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 307, + 506, + 320 + ], + "spans": [ + { + "bbox": [ + 105, + 307, + 136, + 320 + ], + "score": 1.0, + "content": "even if", + "type": "text" + }, + { + "bbox": [ + 136, + 308, + 153, + 318 + ], + "score": 0.32, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 307, + 374, + 320 + ], + "score": 1.0, + "content": "was trained on external data with matched-noise level", + "type": "text" + }, + { + "bbox": [ + 375, + 307, + 396, + 318 + ], + "score": 0.78, + "content": "( { \\bf n } 2 { \\bf v } ^ { \\dagger }", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 307, + 506, + 320 + ], + "score": 1.0, + "content": "in Tab. 2). Performance of", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 318, + 505, + 331 + ], + "spans": [ + { + "bbox": [ + 105, + 318, + 144, + 331 + ], + "score": 1.0, + "content": "TVAE is", + "type": "text" + }, + { + "bbox": [ + 145, + 319, + 170, + 329 + ], + "score": 0.37, + "content": "0 . 2 \\mathrm { d B }", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 318, + 263, + 331 + ], + "score": 1.0, + "content": "lower than BM3D for", + "type": "text" + }, + { + "bbox": [ + 263, + 319, + 297, + 329 + ], + "score": 0.9, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 318, + 315, + 331 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 316, + 319, + 341, + 329 + ], + "score": 0.38, + "content": "0 . 6 \\mathrm { d B }", + "type": "inline_equation" + }, + { + "bbox": [ + 342, + 318, + 386, + 331 + ], + "score": 1.0, + "content": "higher for", + "type": "text" + }, + { + "bbox": [ + 386, + 319, + 419, + 329 + ], + "score": 0.9, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 419, + 318, + 505, + 331 + ], + "score": 1.0, + "content": ", which makes it, for", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 328, + 506, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 328, + 506, + 343 + ], + "score": 1.0, + "content": "large noise levels, the state-of-the-art on this benchmark in the ‘zero-shot’ setting (i.e., the setting", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 340, + 223, + 352 + ], + "spans": [ + { + "bbox": [ + 106, + 340, + 140, + 352 + ], + "score": 1.0, + "content": "n2n and", + "type": "text" + }, + { + "bbox": [ + 141, + 341, + 157, + 351 + ], + "score": 0.45, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 340, + 223, + 352 + ], + "score": 1.0, + "content": "aim to address).", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 176, + 506, + 352 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 368, + 190, + 380 + ], + "lines": [ + { + "bbox": [ + 105, + 366, + 192, + 383 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 192, + 383 + ], + "score": 1.0, + "content": "4 DISCUSSION", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 393, + 505, + 536 + ], + "lines": [ + { + "bbox": [ + 106, + 394, + 505, + 405 + ], + "spans": [ + { + "bbox": [ + 106, + 394, + 505, + 405 + ], + "score": 1.0, + "content": "We investigated a novel way to train VAEs with binary latents. In order to avoid derivatives w.r.t.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 404, + 506, + 417 + ], + "spans": [ + { + "bbox": [ + 105, + 404, + 506, + 417 + ], + "score": 1.0, + "content": "stochastic discrete latents, we here changed the standard training setup substantially. Updates of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 415, + 505, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 415, + 505, + 426 + ], + "score": 1.0, + "content": "the decoder DNN now involve a weighted sum over states (4) and the encoder DNN is replaced", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 426, + 506, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 426, + 506, + 438 + ], + "score": 1.0, + "content": "by a discrete evolutionary optimization. The direct optimization of the encoder replaces methods", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 437, + 506, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 437, + 506, + 450 + ], + "score": 1.0, + "content": "that are usually considered indispensable for the training of VAEs: sampling approximation and", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 448, + 506, + 461 + ], + "spans": [ + { + "bbox": [ + 105, + 448, + 506, + 461 + ], + "score": 1.0, + "content": "reparameterization trick. Furthermore, the here investigated encoding model does not use a joint", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 459, + 506, + 471 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 506, + 471 + ], + "score": 1.0, + "content": "mapping for all datapoints to latent space, i.e., the approach is not amortized. While amortization", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "spans": [ + { + "bbox": [ + 105, + 470, + 505, + 483 + ], + "score": 1.0, + "content": "can be advantageous as information can be shared across datapoints, disadvantages in terms of less", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 480, + 506, + 493 + ], + "spans": [ + { + "bbox": [ + 105, + 480, + 506, + 493 + ], + "score": 1.0, + "content": "tight lower bounds have also been pointed out (e.g. Kim et al., 2018; Cremer et al., 2018). Related", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "to this point, standard VAE training usually involves factored Gaussian approximations of VAE", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 502, + 505, + 515 + ], + "spans": [ + { + "bbox": [ + 105, + 502, + 505, + 515 + ], + "score": 1.0, + "content": "posteriors which can introduce biases (e.g., discussion by Vertes & Sahani, 2018). The investigation ´", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 104, + 513, + 505, + 527 + ], + "spans": [ + { + "bbox": [ + 104, + 513, + 505, + 527 + ], + "score": 1.0, + "content": "of alternatives may therefore, more generally, shed further light on the consequences of specific", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 525, + 320, + 537 + ], + "spans": [ + { + "bbox": [ + 105, + 525, + 320, + 537 + ], + "score": 1.0, + "content": "approximation choices used to define VAE encoders.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 31, + "bbox_fs": [ + 104, + 394, + 506, + 537 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 541, + 504, + 629 + ], + "lines": [ + { + "bbox": [ + 105, + 541, + 506, + 555 + ], + "spans": [ + { + "bbox": [ + 105, + 541, + 506, + 555 + ], + "score": 1.0, + "content": "The price we pay for not using amortization is efficiency: we optimize variational parameters for", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 553, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 553, + 506, + 565 + ], + "score": 1.0, + "content": "each data point which is, of course, more costly. However, direct optimization can scale VAEs to", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 564, + 506, + 576 + ], + "score": 1.0, + "content": "large latent spaces if smaller DNNs are used. When the use of large DNNs is anyway prohibitive", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 574, + 505, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 505, + 587 + ], + "score": 1.0, + "content": "because of limited data, the here studied approach can play out its effectiveness. For the recently", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 585, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 506, + 598 + ], + "score": 1.0, + "content": "popular task of ‘zero-shot’ denoising, we observed state-of-the-art results in a domain where VAEs", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 596, + 506, + 608 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 506, + 608 + ], + "score": 1.0, + "content": "have not been reported to be competitive before. The competitive performance is presumably due", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 607, + 506, + 621 + ], + "spans": [ + { + "bbox": [ + 105, + 607, + 506, + 621 + ], + "score": 1.0, + "content": "to the approach not being subject to an amortization gap as well as not being based on factored", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 619, + 206, + 630 + ], + "spans": [ + { + "bbox": [ + 106, + 619, + 206, + 630 + ], + "score": 1.0, + "content": "variational distributions.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 41.5, + "bbox_fs": [ + 105, + 541, + 506, + 630 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 635, + 504, + 690 + ], + "lines": [ + { + "bbox": [ + 106, + 635, + 505, + 647 + ], + "spans": [ + { + "bbox": [ + 106, + 635, + 505, + 647 + ], + "score": 1.0, + "content": "Our conclusion is consequently that direct discrete optimization can serve as an alternative for train-", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 646, + 505, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 646, + 505, + 658 + ], + "score": 1.0, + "content": "ing discrete VAEs. In a sense, the approach can be considered as a brute-force optimization which is", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 657, + 505, + 670 + ], + "spans": [ + { + "bbox": [ + 105, + 657, + 505, + 670 + ], + "score": 1.0, + "content": "slower than conventional amortized training but more effective for scales at which it can be applied.", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 666, + 505, + 682 + ], + "spans": [ + { + "bbox": [ + 105, + 666, + 505, + 682 + ], + "score": 1.0, + "content": "To our knowledge, the approach is also the first training method for VAEs that is not using sampling-", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 678, + 492, + 693 + ], + "spans": [ + { + "bbox": [ + 105, + 678, + 492, + 693 + ], + "score": 1.0, + "content": "based gradient estimates, and the first which makes VAEs competitive for ‘zero-shot’ denoising.", + "type": "text" + } + ], + "index": 50 + } + ], + "index": 48, + "bbox_fs": [ + 105, + 635, + 505, + 693 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 107, + 81, + 176, + 94 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 176, + 94 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 176, + 94 + ], + "score": 1.0, + "content": "REFERENCES", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 106, + 100, + 504, + 123 + ], + "lines": [ + { + "bbox": [ + 105, + 99, + 504, + 114 + ], + "spans": [ + { + "bbox": [ + 105, + 99, + 504, + 114 + ], + "score": 1.0, + "content": "Jinwon An and Sungzoon Cho. 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(1) the gradient of the lower bound w.r.t.", + "type": "text" + }, + { + "bbox": [ + 328, + 344, + 340, + 353 + ], + "score": 0.67, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 340, + 343, + 410, + 357 + ], + "score": 1.0, + "content": "is then given by:", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10, + "bbox_fs": [ + 105, + 321, + 506, + 357 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 111, + 362, + 510, + 483 + ], + "lines": [ + { + "bbox": [ + 111, + 362, + 510, + 483 + ], + "spans": [ + { + "bbox": [ + 111, + 362, + 510, + 483 + ], + "score": 0.94, + "content": "\\begin{array} { r c l } { { \\displaystyle \\vec { \\nabla } _ { W } \\mathcal { F } ( \\Phi , \\Theta ) } } & { { = } } & { { \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) p _ { \\Theta } ( \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } } } \\\\ { { } } & { { = } } & { { \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\big \\langle \\log \\big ( p _ { \\Theta } ( \\vec { x } ^ { ( n ) } \\mid \\vec { z } ) \\big ) \\big \\rangle _ { q _ { \\Phi } ^ { ( n ) } } = \\displaystyle \\sum _ { n } \\vec { \\nabla } _ { W } \\big \\langle \\log \\big ( \\mathcal { N } ( \\vec { x } ^ { ( n ) } ; 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Standard VAE", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 343, + 506, + 357 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 390, + 357 + ], + "score": 1.0, + "content": "training estimates the gradient by weighting all samples equally (with", + "type": "text" + }, + { + "bbox": [ + 390, + 344, + 419, + 356 + ], + "score": 0.88, + "content": "( 1 / M )", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 343, + 506, + 357 + ], + "score": 1.0, + "content": ") and the gradient di-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 102, + 352, + 508, + 375 + ], + "spans": [ + { + "bbox": [ + 102, + 352, + 423, + 375 + ], + "score": 1.0, + "content": "rection is approximated using sufficiently many samples drawn from the current", + "type": "text" + }, + { + "bbox": [ + 424, + 355, + 453, + 370 + ], + "score": 0.93, + "content": "\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 454, + 352, + 508, + 375 + ], + "score": 1.0, + "content": ". 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These weights are computed by passing the states", + "type": "text" + }, + { + "bbox": [ + 448, + 385, + 456, + 396 + ], + "score": 0.78, + "content": "\\vec { z }", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 381, + 508, + 400 + ], + "score": 1.0, + "content": "through the", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 397, + 505, + 408 + ], + "spans": [ + { + "bbox": [ + 106, + 397, + 505, + 408 + ], + "score": 1.0, + "content": "decoder network. The gradient is then, notably, not a stochastic estimation but exact: gradient ascent", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 408, + 478, + 420 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 478, + 420 + ], + "score": 1.0, + "content": "is guaranteed (for small steps) to always monotonically increase the variational lower bound.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 16.5 + }, + { + "type": "text", + "bbox": [ + 106, + 424, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 106, + 424, + 504, + 437 + ], + "spans": [ + { + "bbox": [ + 106, + 424, + 504, + 437 + ], + "score": 1.0, + "content": "Computational Complexity. To add to the discussion of computational complexity of TVAE com-", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 434, + 505, + 449 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 439, + 449 + ], + "score": 1.0, + "content": "pared to standard VAE training, consider again Eqns. 13 and 14. If as many samples", + "type": "text" + }, + { + "bbox": [ + 440, + 436, + 451, + 445 + ], + "score": 0.8, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 434, + 505, + 449 + ], + "score": 1.0, + "content": "are used, per", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 445, + 506, + 463 + ], + "spans": [ + { + "bbox": [ + 104, + 445, + 253, + 463 + ], + "score": 1.0, + "content": "data point, as there are states in each", + "type": "text" + }, + { + "bbox": [ + 253, + 446, + 271, + 459 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 445, + 506, + 463 + ], + "score": 1.0, + "content": ", then both sums have the same number of summands. The", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 459, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 505, + 473 + ], + "score": 1.0, + "content": "evaluation of the gradients of the mean square error (MSE) is consequently precisely the same for", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 104, + 469, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 104, + 469, + 307, + 490 + ], + "score": 1.0, + "content": "both approaches. The additional weighting factors", + "type": "text" + }, + { + "bbox": [ + 307, + 471, + 337, + 486 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 469, + 506, + 490 + ], + "score": 1.0, + "content": "have to be computed for TVAE. However,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 484, + 505, + 496 + ], + "spans": [ + { + "bbox": [ + 106, + 484, + 505, + 496 + ], + "score": 1.0, + "content": "the weighting factors just represent a small overhead because the evaluation of the decoder DNN for", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 495, + 418, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 156, + 509 + ], + "score": 1.0, + "content": "the states in", + "type": "text" + }, + { + "bbox": [ + 156, + 495, + 175, + 508 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 497, + 400, + 510 + ], + "score": 1.0, + "content": "is a computation that can be reused from the updates of", + "type": "text" + }, + { + "bbox": [ + 400, + 495, + 418, + 508 + ], + "score": 0.91, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + } + ], + "index": 28 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 515, + 505, + 633 + ], + "lines": [ + { + "bbox": [ + 103, + 514, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 103, + 514, + 363, + 532 + ], + "score": 1.0, + "content": "The main computational differences are in the updates of Φ(n)", + "type": "text" + }, + { + "bbox": [ + 360, + 517, + 505, + 529 + ], + "score": 1.0, + "content": "compared to the update of encoder", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 528, + 506, + 541 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 321, + 541 + ], + "score": 1.0, + "content": "DNNs for conventional VAEs. Once the parameters", + "type": "text" + }, + { + "bbox": [ + 321, + 528, + 387, + 541 + ], + "score": 0.93, + "content": "\\Theta = ( W , \\sigma ^ { 2 } , { \\bar { \\vec { \\pi } } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 528, + 506, + 541 + ], + "score": 1.0, + "content": "are updated using (14), new", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 104, + 538, + 507, + 556 + ], + "spans": [ + { + "bbox": [ + 104, + 538, + 147, + 556 + ], + "score": 1.0, + "content": "states for", + "type": "text" + }, + { + "bbox": [ + 147, + 540, + 166, + 552 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 538, + 441, + 556 + ], + "score": 1.0, + "content": "have to be sought based on criterion (9). In practice and for each", + "type": "text" + }, + { + "bbox": [ + 442, + 545, + 449, + 552 + ], + "score": 0.67, + "content": "n", + "type": "inline_equation" + }, + { + "bbox": [ + 449, + 538, + 507, + 556 + ], + "score": 1.0, + "content": ", we generate", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 107, + 552, + 506, + 566 + ], + "spans": [ + { + "bbox": [ + 107, + 553, + 121, + 563 + ], + "score": 0.87, + "content": "M ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 122, + 552, + 506, + 566 + ], + "score": 1.0, + "content": "new states according to the applied evolutionary procedure. 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Furthermore, we have", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 104, + 576, + 504, + 591 + ], + "spans": [ + { + "bbox": [ + 104, + 576, + 255, + 591 + ], + "score": 1.0, + "content": "to pass all M states already in Φ(n)", + "type": "text" + }, + { + "bbox": [ + 251, + 576, + 495, + 590 + ], + "score": 1.0, + "content": "through the DNN to re-evaluate (9) because the parameters", + "type": "text" + }, + { + "bbox": [ + 495, + 577, + 504, + 588 + ], + "score": 0.78, + "content": "\\Theta", + "type": "inline_equation" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 588, + 505, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 588, + 281, + 601 + ], + "score": 1.0, + "content": "have changed. 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The additional overhead to actually draw the samples is usually negligible.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 107, + 709, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 708, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 397, + 722 + ], + "score": 1.0, + "content": "Hence, the computational complexity of TVAE training is comparable if", + "type": "text" + }, + { + "bbox": [ + 397, + 708, + 460, + 720 + ], + "score": 0.91, + "content": "M \\approx M ^ { \\prime } \\approx \\tilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 709, + 505, + 722 + ], + "score": 1.0, + "content": ". 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The size of", + "type": "text" + }, + { + "bbox": [ + 347, + 319, + 365, + 332 + ], + "score": 0.91, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 318, + 506, + 337 + ], + "score": 1.0, + "content": "can consequently be thought of as", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 333, + 505, + 345 + ], + "spans": [ + { + "bbox": [ + 106, + 333, + 505, + 345 + ], + "score": 1.0, + "content": "analog to the number of samples used in a conventional estimation of the gradient. Standard VAE", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 343, + 506, + 357 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 390, + 357 + ], + "score": 1.0, + "content": "training estimates the gradient by weighting all samples equally (with", + "type": "text" + }, + { + "bbox": [ + 390, + 344, + 419, + 356 + ], + "score": 0.88, + "content": "( 1 / M )", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 343, + 506, + 357 + ], + "score": 1.0, + "content": ") and the gradient di-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 102, + 352, + 508, + 375 + ], + "spans": [ + { + "bbox": [ + 102, + 352, + 423, + 375 + ], + "score": 1.0, + "content": "rection is approximated using sufficiently many samples drawn from the current", + "type": "text" + }, + { + "bbox": [ + 424, + 355, + 453, + 370 + ], + "score": 0.93, + "content": "\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 454, + 352, + 508, + 375 + ], + "score": 1.0, + "content": ". 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The gradient is then, notably, not a stochastic estimation but exact: gradient ascent", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 408, + 478, + 420 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 478, + 420 + ], + "score": 1.0, + "content": "is guaranteed (for small steps) to always monotonically increase the variational lower bound.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 16.5, + "bbox_fs": [ + 102, + 289, + 508, + 420 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 424, + 505, + 510 + ], + "lines": [ + { + "bbox": [ + 106, + 424, + 504, + 437 + ], + "spans": [ + { + "bbox": [ + 106, + 424, + 504, + 437 + ], + "score": 1.0, + "content": "Computational Complexity. To add to the discussion of computational complexity of TVAE com-", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 434, + 505, + 449 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 439, + 449 + ], + "score": 1.0, + "content": "pared to standard VAE training, consider again Eqns. 13 and 14. If as many samples", + "type": "text" + }, + { + "bbox": [ + 440, + 436, + 451, + 445 + ], + "score": 0.8, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 434, + 505, + 449 + ], + "score": 1.0, + "content": "are used, per", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 104, + 445, + 506, + 463 + ], + "spans": [ + { + "bbox": [ + 104, + 445, + 253, + 463 + ], + "score": 1.0, + "content": "data point, as there are states in each", + "type": "text" + }, + { + "bbox": [ + 253, + 446, + 271, + 459 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 445, + 506, + 463 + ], + "score": 1.0, + "content": ", then both sums have the same number of summands. The", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 459, + 505, + 473 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 505, + 473 + ], + "score": 1.0, + "content": "evaluation of the gradients of the mean square error (MSE) is consequently precisely the same for", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 104, + 469, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 104, + 469, + 307, + 490 + ], + "score": 1.0, + "content": "both approaches. The additional weighting factors", + "type": "text" + }, + { + "bbox": [ + 307, + 471, + 337, + 486 + ], + "score": 0.93, + "content": "q _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 337, + 469, + 506, + 490 + ], + "score": 1.0, + "content": "have to be computed for TVAE. However,", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 484, + 505, + 496 + ], + "spans": [ + { + "bbox": [ + 106, + 484, + 505, + 496 + ], + "score": 1.0, + "content": "the weighting factors just represent a small overhead because the evaluation of the decoder DNN for", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 495, + 418, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 156, + 509 + ], + "score": 1.0, + "content": "the states in", + "type": "text" + }, + { + "bbox": [ + 156, + 495, + 175, + 508 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 175, + 497, + 400, + 510 + ], + "score": 1.0, + "content": "is a computation that can be reused from the updates of", + "type": "text" + }, + { + "bbox": [ + 400, + 495, + 418, + 508 + ], + "score": 0.91, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + } + ], + "index": 28 + } + ], + "index": 25, + "bbox_fs": [ + 104, + 424, + 506, + 510 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 515, + 505, + 633 + ], + "lines": [ + { + "bbox": [ + 103, + 514, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 103, + 514, + 363, + 532 + ], + "score": 1.0, + "content": "The main computational differences are in the updates of Φ(n)", + "type": "text" + }, + { + "bbox": [ + 360, + 517, + 505, + 529 + ], + "score": 1.0, + "content": "compared to the update of encoder", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 528, + 506, + 541 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 321, + 541 + ], + "score": 1.0, + "content": "DNNs for conventional VAEs. Once the parameters", + "type": "text" + }, + { + "bbox": [ + 321, + 528, + 387, + 541 + ], + "score": 0.93, + "content": "\\Theta = ( W , \\sigma ^ { 2 } , { \\bar { \\vec { \\pi } } } )", + "type": "inline_equation" + }, + { + "bbox": [ + 388, + 528, + 506, + 541 + ], + "score": 1.0, + "content": "are updated using (14), new", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 104, + 538, + 507, + 556 + ], + "spans": [ + { + "bbox": [ + 104, + 538, + 147, + 556 + ], + "score": 1.0, + "content": "states for", + "type": "text" + }, + { + "bbox": [ + 147, + 540, + 166, + 552 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 538, + 441, + 556 + ], + "score": 1.0, + "content": "have to be sought based on criterion (9). In practice and for each", + "type": "text" + }, + { + "bbox": [ + 442, + 545, + 449, + 552 + ], + "score": 0.67, + "content": "n", + "type": "inline_equation" + }, + { + "bbox": [ + 449, + 538, + 507, + 556 + ], + "score": 1.0, + "content": ", we generate", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 107, + 552, + 506, + 566 + ], + "spans": [ + { + "bbox": [ + 107, + 553, + 121, + 563 + ], + "score": 0.87, + "content": "M ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 122, + 552, + 506, + 566 + ], + "score": 1.0, + "content": "new states according to the applied evolutionary procedure. To select the best states we have", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 104, + 564, + 506, + 577 + ], + "spans": [ + { + "bbox": [ + 104, + 564, + 175, + 577 + ], + "score": 1.0, + "content": "to pass all these", + "type": "text" + }, + { + "bbox": [ + 175, + 564, + 190, + 574 + ], + "score": 0.86, + "content": "M ^ { \\prime }", + "type": "inline_equation" + }, + { + "bbox": [ + 190, + 564, + 506, + 577 + ], + "score": 1.0, + "content": "new states through the decoder DNN to evaluate (9). Furthermore, we have", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 104, + 576, + 504, + 591 + ], + "spans": [ + { + "bbox": [ + 104, + 576, + 255, + 591 + ], + "score": 1.0, + "content": "to pass all M states already in Φ(n)", + "type": "text" + }, + { + "bbox": [ + 251, + 576, + 495, + 590 + ], + "score": 1.0, + "content": "through the DNN to re-evaluate (9) because the parameters", + "type": "text" + }, + { + "bbox": [ + 495, + 577, + 504, + 588 + ], + "score": 0.78, + "content": "\\Theta", + "type": "inline_equation" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 588, + 505, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 588, + 281, + 601 + ], + "score": 1.0, + "content": "have changed. 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The EA does add to the computational load but parent", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 621, + 437, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 621, + 437, + 633 + ], + "score": 1.0, + "content": "selection and mutation only add a constant offset for each of the considered states.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 33.5, + "bbox_fs": [ + 103, + 514, + 507, + 633 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 640, + 505, + 703 + ], + "lines": [ + { + "bbox": [ + 102, + 634, + 505, + 659 + ], + "spans": [ + { + "bbox": [ + 102, + 634, + 291, + 659 + ], + "score": 1.0, + "content": "For comparison with standard VAEs, if we use", + "type": "text" + }, + { + "bbox": [ + 291, + 641, + 303, + 651 + ], + "score": 0.75, + "content": "M", + "type": "inline_equation" + }, + { + "bbox": [ + 303, + 634, + 393, + 659 + ], + "score": 1.0, + "content": "samples of an encoder", + "type": "text" + }, + { + "bbox": [ + 394, + 638, + 424, + 654 + ], + "score": 0.95, + "content": "\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 424, + 634, + 471, + 659 + ], + "score": 1.0, + "content": ", we require", + "type": "text" + }, + { + "bbox": [ + 472, + 640, + 505, + 653 + ], + "score": 0.88, + "content": "\\mathcal { O } ( M \\times", + "type": "inline_equation" + } + ], + "index": 39 + }, + { + "bbox": [ + 117, + 652, + 505, + 664 + ], + "spans": [ + { + "bbox": [ + 117, + 652, + 356, + 664 + ], + "score": 1.0, + "content": ") passes through the decoder DNN to update the parameters", + "type": "text" + }, + { + "bbox": [ + 365, + 652, + 505, + 664 + ], + "score": 1.0, + "content": "according to (13). For the encoder", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 663, + 505, + 677 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 192, + 677 + ], + "score": 1.0, + "content": "update, one requires", + "type": "text" + }, + { + "bbox": [ + 193, + 663, + 227, + 675 + ], + "score": 0.92, + "content": "N \\times { \\tilde { M } }", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 665, + 505, + 677 + ], + "score": 1.0, + "content": "passes through encoder and decoder DNN to estimate the gradient", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 675, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 261, + 690 + ], + "score": 1.0, + "content": "w.r.t. the encoder weights (if we draw", + "type": "text" + }, + { + "bbox": [ + 262, + 675, + 273, + 687 + ], + "score": 0.86, + "content": "\\tilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 274, + 676, + 506, + 690 + ], + "score": 1.0, + "content": "samples for each data point from a conventional encoder", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 688, + 491, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 155, + 705 + ], + "score": 1.0, + "content": "distribution", + "type": "text" + }, + { + "bbox": [ + 155, + 688, + 185, + 703 + ], + "score": 0.93, + "content": "\\tilde { q } _ { \\Phi } ^ { ( n ) } ( \\vec { z } )", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 688, + 491, + 705 + ], + "score": 1.0, + "content": ". The additional overhead to actually draw the samples is usually negligible.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 41, + "bbox_fs": [ + 102, + 634, + 506, + 705 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 709, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 708, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 397, + 722 + ], + "score": 1.0, + "content": "Hence, the computational complexity of TVAE training is comparable if", + "type": "text" + }, + { + "bbox": [ + 397, + 708, + 460, + 720 + ], + "score": 0.91, + "content": "M \\approx M ^ { \\prime } \\approx \\tilde { M }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 709, + 505, + 722 + ], + "score": 1.0, + "content": ". 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Left: meth-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 383, + 505, + 395 + ], + "spans": [ + { + "bbox": [ + 106, + 383, + 505, + 395 + ], + "score": 1.0, + "content": "ods applied for encoding models of standard VAEs. Middle: additional methods applied to maintain", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 394, + 505, + 407 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 505, + 407 + ], + "score": 1.0, + "content": "the standard procedure of encoding model optimization also for discrete latent variables. 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Neural network units Input (H) 64 (512) Middle 64 (512)
Output (D) 64 (144) Cyclic Learning Rates
Min 1.r. 0.0001
Max l.r. 0.01 (0.05)
Epochs/cycle 20 Batch size 32
Evolutionaryparameters
Parents 10 (5) Children 9 (4) Generations 4(1)
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0=15g=25q=50
n2v*32.0529.2025.42
n2vt32.9332.1020.96
n2vt33.9132.1028.94
TVAE34.27 ± .0232.65 ± .0629.98 ± .05
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Neural network units Input (H) 64 (512) Middle 64 (512)
Output (D) 64 (144) Cyclic Learning Rates
Min 1.r. 0.0001
Max l.r. 0.01 (0.05)
Epochs/cycle 20 Batch size 32
Evolutionaryparameters
Parents 10 (5) Children 9 (4) Generations 4(1)
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n2v*32.0529.2025.42
n2vt32.9332.1020.96
n2vt33.9132.1028.94
TVAE34.27 ± .0232.65 ± .0629.98 ± .05
", + "type": "table", + "image_path": "c425fd391cd8fc944e87795092b57c8aac91610ed44014a53c090355e4f0675d.jpg" + } + ] + } + ], + "index": 31, + "virtual_lines": [ + { + "bbox": [ + 284, + 424, + 486, + 437.0 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 284, + 437.0, + 486, + 450.0 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 284, + 450.0, + 486, + 463.0 + ], + "spans": [], + "index": 31 + }, + { + "bbox": [ + 284, + 463.0, + 486, + 476.0 + ], + "spans": [], + "index": 32 + }, + { + "bbox": [ + 284, + 476.0, + 486, + 489.0 + ], + "spans": [], + "index": 33 + } + ] + } + ], + "index": 31 + }, + { + "type": "text", + "bbox": [ + 106, + 500, + 505, + 621 + ], + "lines": [ + { + "bbox": [ + 105, + 500, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 505, + 513 + ], + "score": 1.0, + "content": "To evaluate the performance on standard denoising benchmarks, we first compared TVAE to related", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 511, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 505, + 524 + ], + "score": 1.0, + "content": "probabilistic sparse coding approaches such as MTMKL, GSC and var-BSC (Tab. 1). MTMKL", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 522, + 505, + 536 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 505, + 536 + ], + "score": 1.0, + "content": "and GSC use the data model of spike-and-slab sparse coding and for training mean-field and trun-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 533, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 505, + 546 + ], + "score": 1.0, + "content": "cated posterior approximations with pre-selection are used, respectively. Compared to MTMKL", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 544, + 505, + 557 + ], + "spans": [ + { + "bbox": [ + 106, + 544, + 505, + 557 + ], + "score": 1.0, + "content": "and GSC, var-BSC uses a less complex data model and a training scheme also based on evolution-", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 555, + 505, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 555, + 505, + 568 + ], + "score": 1.0, + "content": "ary optimization (Guiraud et al., 2018). The denoising performance observed in the scenario with", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 566, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 566, + 359, + 579 + ], + "score": 1.0, + "content": "controlled conditions (Tab. 1) shows that for high noise level", + "type": "text" + }, + { + "bbox": [ + 360, + 567, + 394, + 577 + ], + "score": 0.86, + "content": "( \\sigma = 5 0 ", + "type": "inline_equation" + }, + { + "bbox": [ + 395, + 566, + 505, + 579 + ], + "score": 1.0, + "content": "), var-BSC achieves higher", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 576, + 505, + 590 + ], + "spans": [ + { + "bbox": [ + 105, + 576, + 505, + 590 + ], + "score": 1.0, + "content": "PSNR values than MTMKL and GSC although the method uses a simpler data model. This observa-", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 104, + 587, + 505, + 601 + ], + "spans": [ + { + "bbox": [ + 104, + 587, + 505, + 601 + ], + "score": 1.0, + "content": "tion demonstrates the effectiveness of the evolutionary training method used by var-BSC. However,", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 599, + 506, + 613 + ], + "spans": [ + { + "bbox": [ + 105, + 599, + 506, + 613 + ], + "score": 1.0, + "content": "PSNR values for TVAE are significantly higher due to the higher flexibility in modeling the data", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 609, + 267, + 622 + ], + "spans": [ + { + "bbox": [ + 105, + 609, + 267, + 622 + ], + "score": 1.0, + "content": "distribution provided by the used DNN.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 39, + "bbox_fs": [ + 104, + 500, + 506, + 622 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 626, + 505, + 682 + ], + "lines": [ + { + "bbox": [ + 105, + 625, + 506, + 641 + ], + "spans": [ + { + "bbox": [ + 105, + 625, + 506, + 641 + ], + "score": 1.0, + "content": "In a second step, Tab. 2 compared the performance of TVAE with respect to different denoising", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 637, + 506, + 652 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 506, + 652 + ], + "score": 1.0, + "content": "approaches including deterministic sparse coding (KSVD), a mixture model approach (EPLL), a", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 104, + 646, + 506, + 664 + ], + "spans": [ + { + "bbox": [ + 104, + 646, + 506, + 664 + ], + "score": 1.0, + "content": "non-local image processing method (WNNM) and state-of-the-art denoising methods based on deep", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 659, + 505, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 505, + 673 + ], + "score": 1.0, + "content": "neural networks (BDGAN and DPDNN). These approaches can be distinguished, e.g., by the amount", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 671, + 365, + 684 + ], + "spans": [ + { + "bbox": [ + 105, + 671, + 365, + 684 + ], + "score": 1.0, + "content": "of employed training data and by the requirement for clean data.", + "type": "text" + } + ], + "index": 49 + } + ], + "index": 47, + "bbox_fs": [ + 104, + 625, + 506, + 684 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 686, + 506, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 686, + 506, + 701 + ], + "score": 1.0, + "content": "TVAE as well as MTMKL, GSC and var-BSC do not require clean images for training. Furthermore,", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "score": 1.0, + "content": "all these approaches can be trained if only the single noisy image is available (‘zero-shot’ learning;", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 710, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 506, + 722 + ], + "score": 1.0, + "content": "compare, e.g., Shocher et al., 2018; Imamura et al., 2019). Instead, EPLL, BDGAN and DPDNN use", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "clean training data (typically tens or hundreds of thousands of data points are collected for training).", + "type": "text" + } + ], + "index": 53 + } + ], + "index": 51.5, + "bbox_fs": [ + 105, + 686, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 505, + 345 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 241, + 95 + ], + "score": 1.0, + "content": "Approaches such as noise2noise", + "type": "text" + }, + { + "bbox": [ + 241, + 83, + 258, + 93 + ], + "score": 0.36, + "content": "\\mathtt { n 2 n }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 82, + 506, + 95 + ], + "score": 1.0, + "content": "Lehtinen et al., 2018) and noise2void (n2v Krull et al., 2019)", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "score": 1.0, + "content": "occupy a middle ground: they can be trained on noisy data but they typically require much larger", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 506, + 117 + ], + "score": 1.0, + "content": "amounts of data than, e.g., TVAE or MTMKL. In the original n2v publication, for instance, 400", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 138, + 128 + ], + "score": 1.0, + "content": "(noisy)", + "type": "text" + }, + { + "bbox": [ + 138, + 115, + 183, + 126 + ], + "score": 0.85, + "content": "1 8 0 \\times 1 8 0", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 115, + 506, + 128 + ], + "score": 1.0, + "content": "BSD (Martin et al., 2001) images were used to create a training dataset (this", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 506, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 506, + 139 + ], + "score": 1.0, + "content": "procedure also involved data augmentation; compare Krull et al. 2019). For our comparison with", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 104, + 137, + 506, + 150 + ], + "spans": [ + { + "bbox": [ + 104, + 137, + 383, + 150 + ], + "score": 1.0, + "content": "results of Tab. 2, we used the standard, publicly available code for", + "type": "text" + }, + { + "bbox": [ + 383, + 138, + 400, + 148 + ], + "score": 0.39, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 137, + 506, + 150 + ], + "score": 1.0, + "content": "together with the default", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 149, + 504, + 161 + ], + "spans": [ + { + "bbox": [ + 106, + 149, + 158, + 161 + ], + "score": 1.0, + "content": "training set", + "type": "text" + }, + { + "bbox": [ + 158, + 149, + 192, + 159 + ], + "score": 0.85, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 149, + 487, + 161 + ], + "score": 1.0, + "content": ") employed in the original n2v publication. We then applied the trained", + "type": "text" + }, + { + "bbox": [ + 487, + 149, + 504, + 159 + ], + "score": 0.48, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 159, + 505, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 159, + 279, + 172 + ], + "score": 1.0, + "content": "network to denoise the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 279, + 160, + 310, + 169 + ], + "score": 0.89, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 159, + 439, + 172 + ], + "score": 1.0, + "content": ". The resulting PSNR value was", + "type": "text" + }, + { + "bbox": [ + 440, + 159, + 477, + 170 + ], + "score": 0.84, + "content": "3 2 . 1 0 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 159, + 505, + 172 + ], + "score": 1.0, + "content": "which", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 170, + 505, + 182 + ], + "spans": [ + { + "bbox": [ + 106, + 171, + 116, + 182 + ], + "score": 1.0, + "content": "is", + "type": "text" + }, + { + "bbox": [ + 116, + 170, + 149, + 181 + ], + "score": 0.87, + "content": "0 . 7 6 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 171, + 309, + 182 + ], + "score": 1.0, + "content": "lower than the PSNR value for BM3D", + "type": "text" + }, + { + "bbox": [ + 309, + 171, + 352, + 181 + ], + "score": 0.77, + "content": "( 3 2 . 8 6 d B )", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 171, + 505, + 182 + ], + "score": 1.0, + "content": ". The difference is consistent with an", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 181, + 505, + 193 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 152, + 193 + ], + "score": 1.0, + "content": "on average", + "type": "text" + }, + { + "bbox": [ + 152, + 181, + 184, + 192 + ], + "score": 0.86, + "content": "0 . 8 8 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 181, + 274, + 193 + ], + "score": 1.0, + "content": "lower performance of", + "type": "text" + }, + { + "bbox": [ + 274, + 182, + 291, + 192 + ], + "score": 0.44, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 291, + 181, + 505, + 193 + ], + "score": 1.0, + "content": "compared to BM3D on the BSD68 test set (see Krull", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 192, + 505, + 205 + ], + "spans": [ + { + "bbox": [ + 105, + 192, + 505, + 205 + ], + "score": 1.0, + "content": "et al., 2019). The same network can also be used to denoise an image with lower or higher noise", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 203, + 504, + 215 + ], + "spans": [ + { + "bbox": [ + 105, + 203, + 151, + 215 + ], + "score": 1.0, + "content": "level. The", + "type": "text" + }, + { + "bbox": [ + 151, + 204, + 168, + 214 + ], + "score": 0.28, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 169, + 203, + 249, + 215 + ], + "score": 1.0, + "content": "network trained on", + "type": "text" + }, + { + "bbox": [ + 250, + 203, + 283, + 213 + ], + "score": 0.9, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 203, + 466, + 215 + ], + "score": 1.0, + "content": "does, for instance, result in PSNR values of", + "type": "text" + }, + { + "bbox": [ + 467, + 203, + 504, + 213 + ], + "score": 0.8, + "content": "3 2 . 9 3 d B", + "type": "inline_equation" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 213, + 504, + 226 + ], + "spans": [ + { + "bbox": [ + 105, + 213, + 217, + 226 + ], + "score": 1.0, + "content": "for the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 217, + 214, + 250, + 224 + ], + "score": 0.9, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 213, + 279, + 226 + ], + "score": 1.0, + "content": "and in", + "type": "text" + }, + { + "bbox": [ + 280, + 214, + 317, + 225 + ], + "score": 0.86, + "content": "2 0 . 9 6 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 213, + 429, + 226 + ], + "score": 1.0, + "content": "for the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 429, + 214, + 462, + 225 + ], + "score": 0.89, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 213, + 482, + 226 + ], + "score": 1.0, + "content": "(see", + "type": "text" + }, + { + "bbox": [ + 482, + 213, + 504, + 224 + ], + "score": 0.87, + "content": "n 2 v ^ { \\dagger }", + "type": "inline_equation" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 225, + 505, + 237 + ], + "spans": [ + { + "bbox": [ + 105, + 225, + 505, + 237 + ], + "score": 1.0, + "content": "in Tab. 4). Especially for high noise levels performance can be much improved, however, if the n2v", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 237, + 505, + 248 + ], + "spans": [ + { + "bbox": [ + 106, + 237, + 505, + 248 + ], + "score": 1.0, + "content": "network is trained using images with the same noise level as the test image. In order to do so, we", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 247, + 505, + 259 + ], + "spans": [ + { + "bbox": [ + 106, + 247, + 266, + 259 + ], + "score": 1.0, + "content": "followed the procedure described in the", + "type": "text" + }, + { + "bbox": [ + 266, + 248, + 283, + 258 + ], + "score": 0.45, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 247, + 463, + 259 + ], + "score": 1.0, + "content": "publication while adapting the noise level of", + "type": "text" + }, + { + "bbox": [ + 463, + 247, + 494, + 257 + ], + "score": 0.89, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 247, + 505, + 259 + ], + "score": 1.0, + "content": "in", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 258, + 506, + 270 + ], + "spans": [ + { + "bbox": [ + 105, + 258, + 160, + 270 + ], + "score": 1.0, + "content": "one case and", + "type": "text" + }, + { + "bbox": [ + 160, + 258, + 191, + 268 + ], + "score": 0.9, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 258, + 506, + 270 + ], + "score": 1.0, + "content": "for the other case. Trained on a dataset with matched noise, we then denoised", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 268, + 505, + 281 + ], + "spans": [ + { + "bbox": [ + 105, + 268, + 202, + 281 + ], + "score": 1.0, + "content": "the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 203, + 269, + 235, + 279 + ], + "score": 0.89, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 268, + 300, + 281 + ], + "score": 1.0, + "content": "in the one, and", + "type": "text" + }, + { + "bbox": [ + 300, + 269, + 333, + 279 + ], + "score": 0.89, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 268, + 472, + 281 + ], + "score": 1.0, + "content": "in the other case (results listed as", + "type": "text" + }, + { + "bbox": [ + 472, + 268, + 493, + 280 + ], + "score": 0.88, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 268, + 505, + 281 + ], + "score": 1.0, + "content": "in", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 279, + 506, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 279, + 506, + 292 + ], + "score": 1.0, + "content": "Tab. 4). The PSNR values obtained for ‘house’ in this matched-noise-level scenario are much higher", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 290, + 506, + 303 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 362, + 303 + ], + "score": 1.0, + "content": "compared to the scenario with unmatched noise level (e.g., for", + "type": "text" + }, + { + "bbox": [ + 362, + 291, + 396, + 301 + ], + "score": 0.9, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 290, + 506, + 303 + ], + "score": 1.0, + "content": "the PSNR improvement is", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 302, + 506, + 315 + ], + "spans": [ + { + "bbox": [ + 105, + 302, + 419, + 315 + ], + "score": 1.0, + "content": "approximately 8 dB). The much lower performance for mismatched noise for", + "type": "text" + }, + { + "bbox": [ + 419, + 302, + 436, + 312 + ], + "score": 0.36, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 302, + 506, + 315 + ], + "score": 1.0, + "content": "is in this respect", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 312, + 505, + 325 + ], + "spans": [ + { + "bbox": [ + 106, + 312, + 505, + 325 + ], + "score": 1.0, + "content": "consistent with observations for standard DNN denoising for which training with the ground-truth", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 104, + 322, + 505, + 338 + ], + "spans": [ + { + "bbox": [ + 104, + 322, + 505, + 338 + ], + "score": 1.0, + "content": "noise level has been pointed out as important for performance (Chaudhury & Roy, 2017; Zhang", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 334, + 158, + 346 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 158, + 346 + ], + "score": 1.0, + "content": "et al., 2018).", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 11.5 + }, + { + "type": "text", + "bbox": [ + 107, + 351, + 505, + 429 + ], + "lines": [ + { + "bbox": [ + 105, + 350, + 505, + 364 + ], + "spans": [ + { + "bbox": [ + 105, + 350, + 124, + 364 + ], + "score": 1.0, + "content": "The", + "type": "text" + }, + { + "bbox": [ + 125, + 352, + 142, + 362 + ], + "score": 0.47, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 350, + 505, + 364 + ], + "score": 1.0, + "content": "approach can avoid having to know the exact noise level, e.g., if it is trained on just the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 362, + 506, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 506, + 375 + ], + "score": 1.0, + "content": "single noisy image. In a last experiment, we hence investigated this ‘zero-shot’ denoising feature", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 372, + 505, + 387 + ], + "spans": [ + { + "bbox": [ + 105, + 372, + 505, + 387 + ], + "score": 1.0, + "content": "of n2v and applied the algorithm to denoise the ‘house’ image while using the same noisy image", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 385, + 505, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 385, + 410, + 397 + ], + "score": 1.0, + "content": "for training that we seek to denoise (we took the publicly available code of", + "type": "text" + }, + { + "bbox": [ + 411, + 385, + 427, + 395 + ], + "score": 0.43, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 385, + 505, + 397 + ], + "score": 1.0, + "content": "as an example and", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 394, + 506, + 408 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 506, + 408 + ], + "score": 1.0, + "content": "manually adjusted hyperparameters as follows: we set the ”Percentage of pixel to manipulate per", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 406, + 506, + 418 + ], + "spans": [ + { + "bbox": [ + 105, + 406, + 506, + 418 + ], + "score": 1.0, + "content": "patch” to a value of 0.4, as ”Number of training epochs” we used 400 and we set the ”Number of", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 417, + 496, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 418, + 434, + 429 + ], + "score": 1.0, + "content": "parameter update steps per epoch” to 33). The obtained PSNR values are listed as", + "type": "text" + }, + { + "bbox": [ + 435, + 417, + 455, + 428 + ], + "score": 0.85, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ast }", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 418, + 496, + 429 + ], + "score": 1.0, + "content": "in Tab. 4.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 27 + }, + { + "type": "text", + "bbox": [ + 107, + 434, + 505, + 555 + ], + "lines": [ + { + "bbox": [ + 105, + 433, + 505, + 446 + ], + "spans": [ + { + "bbox": [ + 105, + 433, + 405, + 446 + ], + "score": 1.0, + "content": "From Tab. 4 it can be observed, that for all considered training settings of", + "type": "text" + }, + { + "bbox": [ + 405, + 435, + 422, + 444 + ], + "score": 0.54, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 433, + 505, + 446 + ], + "score": 1.0, + "content": "and all noise levels,", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 444, + 506, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 444, + 351, + 457 + ], + "score": 1.0, + "content": "PSNR values of TVAE are consistently higher than those of", + "type": "text" + }, + { + "bbox": [ + 351, + 446, + 368, + 456 + ], + "score": 0.3, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 444, + 399, + 457 + ], + "score": 1.0, + "content": "even if", + "type": "text" + }, + { + "bbox": [ + 399, + 446, + 416, + 456 + ], + "score": 0.45, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 444, + 506, + 457 + ], + "score": 1.0, + "content": "is trained on external", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 456, + 505, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 472, + 469 + ], + "score": 1.0, + "content": "data with matched-noise level. Additional parameter tuning may improve performance of", + "type": "text" + }, + { + "bbox": [ + 472, + 456, + 493, + 466 + ], + "score": 0.86, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ast }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 456, + 505, + 469 + ], + "score": 1.0, + "content": "to", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 467, + 347, + 479 + ], + "score": 1.0, + "content": "a certain extent but PSNRs are in general much lower than", + "type": "text" + }, + { + "bbox": [ + 347, + 466, + 367, + 478 + ], + "score": 0.87, + "content": "\\mathrm { \\hat { n } } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 467, + 468, + 479 + ], + "score": 1.0, + "content": ". While we followed for", + "type": "text" + }, + { + "bbox": [ + 468, + 467, + 489, + 478 + ], + "score": 0.87, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 467, + 505, + 479 + ], + "score": 1.0, + "content": "the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 478, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 478, + 405, + 490 + ], + "score": 1.0, + "content": "standard hyperparameter setting of the original paper/code publication of", + "type": "text" + }, + { + "bbox": [ + 405, + 479, + 422, + 489 + ], + "score": 0.41, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 423, + 478, + 505, + 490 + ], + "score": 1.0, + "content": "(Krull et al., 2019),", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 489, + 504, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 504, + 501 + ], + "score": 1.0, + "content": "we cannot exclude further improvements with parameter fine tuning for the ‘house’ benchmark.", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 499, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 106, + 500, + 283, + 511 + ], + "score": 1.0, + "content": "However, we remark that the difference of", + "type": "text" + }, + { + "bbox": [ + 284, + 499, + 304, + 510 + ], + "score": 0.88, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 500, + 505, + 511 + ], + "score": 1.0, + "content": "and BM3D for the ‘house’ benchmark is on the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "score": 1.0, + "content": "very same range as the differences between n2v and BM3D as reported on the BSD data set in the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 522, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 505, + 534 + ], + "score": 1.0, + "content": "original n2v publication. The stronger performing BM3D is according to denoising performance the", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 533, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 428, + 545 + ], + "score": 1.0, + "content": "preferable comparison and as such included in Tab. 2. In terms of efficiency, the", + "type": "text" + }, + { + "bbox": [ + 429, + 533, + 446, + 543 + ], + "score": 0.26, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 533, + 505, + 545 + ], + "score": 1.0, + "content": "approach is in", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 544, + 380, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 380, + 556 + ], + "score": 1.0, + "content": "general (once trained) faster than BM3D as well as TVAE, however.", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 36 + }, + { + "type": "text", + "bbox": [ + 107, + 560, + 505, + 649 + ], + "lines": [ + { + "bbox": [ + 105, + 560, + 505, + 573 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 222, + 573 + ], + "score": 1.0, + "content": "PSNR values of noise2noise", + "type": "text" + }, + { + "bbox": [ + 222, + 561, + 244, + 572 + ], + "score": 0.35, + "content": "( \\mathtt { n 2 n } )", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 560, + 505, + 573 + ], + "score": 1.0, + "content": "are usually very closely aligned with PSNR values achievable by", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 572, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 263, + 584 + ], + "score": 1.0, + "content": "feed-forward DNNs. More concretely,", + "type": "text" + }, + { + "bbox": [ + 263, + 572, + 280, + 582 + ], + "score": 0.33, + "content": "\\mathfrak { n } 2 \\mathfrak { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 572, + 505, + 584 + ], + "score": 1.0, + "content": "uses, for instance, a RED30 network (Mao et al., 2016)", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 582, + 505, + 594 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 505, + 594 + ], + "score": 1.0, + "content": "which achieves 31.07 dB PSNR on the BSD300 data set if trained on clean data. If directly trained", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 592, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 592, + 506, + 607 + ], + "score": 1.0, + "content": "on noisy data, RED30 achieves 31.06 dB (Lehtinen et al., 2018). n2n is thus strongly performing", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 605, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 106, + 605, + 506, + 617 + ], + "score": 1.0, + "content": "in terms of PSNR. The caveat of n2n compared to n2v is, however, that the noisy data n2n uses is", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 616, + 505, + 627 + ], + "spans": [ + { + "bbox": [ + 106, + 616, + 505, + 627 + ], + "score": 1.0, + "content": "rather artificial. The pairs of images n2n is trained on consist of two different noise realization of", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 626, + 506, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 506, + 639 + ], + "score": 1.0, + "content": "the same underlying clean image. For real data, such a setting is only approximately occurring at", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 637, + 289, + 650 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 289, + 650 + ], + "score": 1.0, + "content": "most, which has motivated the n2v approach.", + "type": "text" + } + ], + "index": 49 + } + ], + "index": 45.5 + }, + { + "type": "text", + "bbox": [ + 107, + 654, + 504, + 699 + ], + "lines": [ + { + "bbox": [ + 105, + 654, + 506, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 506, + 667 + ], + "score": 1.0, + "content": "Like n2v, BDGAN and DPDNN are optimized for specific noise levels (specific standard deviations", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "are used to generate the noisy training examples). EPLL is trained exclusively on clean image", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "patches; for denoising, the algorithm requires the ground-truth noise level of the test image as input", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 687, + 461, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 461, + 700 + ], + "score": 1.0, + "content": "parameter. Ground-truth noise level information is also required by KSVD and WNNM.", + "type": "text" + } + ], + "index": 53 + } + ], + "index": 51.5 + }, + { + "type": "text", + "bbox": [ + 107, + 704, + 504, + 726 + ], + "lines": [ + { + "bbox": [ + 105, + 704, + 505, + 717 + ], + "spans": [ + { + "bbox": [ + 105, + 704, + 505, + 717 + ], + "score": 1.0, + "content": "Like all approaches in the top category of Tab. 2, TVAE does not require ground-truth noise level", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 106, + 715, + 505, + 727 + ], + "spans": [ + { + "bbox": [ + 106, + 715, + 505, + 727 + ], + "score": 1.0, + "content": "information, nor clean images, nor large amounts of training data. For the ‘zero-shot’ setting, TVAE", + "type": "text" + } + ], + "index": 55 + } + ], + "index": 54.5 + } + ], + "page_idx": 17, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 306, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 301, + 752, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 763 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 763 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 13, + "width": 13 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 82, + 505, + 345 + ], + "lines": [ + { + "bbox": [ + 106, + 82, + 506, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 82, + 241, + 95 + ], + "score": 1.0, + "content": "Approaches such as noise2noise", + "type": "text" + }, + { + "bbox": [ + 241, + 83, + 258, + 93 + ], + "score": 0.36, + "content": "\\mathtt { n 2 n }", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 82, + 506, + 95 + ], + "score": 1.0, + "content": "Lehtinen et al., 2018) and noise2void (n2v Krull et al., 2019)", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 506, + 106 + ], + "score": 1.0, + "content": "occupy a middle ground: they can be trained on noisy data but they typically require much larger", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 506, + 117 + ], + "score": 1.0, + "content": "amounts of data than, e.g., TVAE or MTMKL. In the original n2v publication, for instance, 400", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 138, + 128 + ], + "score": 1.0, + "content": "(noisy)", + "type": "text" + }, + { + "bbox": [ + 138, + 115, + 183, + 126 + ], + "score": 0.85, + "content": "1 8 0 \\times 1 8 0", + "type": "inline_equation" + }, + { + "bbox": [ + 184, + 115, + 506, + 128 + ], + "score": 1.0, + "content": "BSD (Martin et al., 2001) images were used to create a training dataset (this", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 506, + 139 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 506, + 139 + ], + "score": 1.0, + "content": "procedure also involved data augmentation; compare Krull et al. 2019). For our comparison with", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 104, + 137, + 506, + 150 + ], + "spans": [ + { + "bbox": [ + 104, + 137, + 383, + 150 + ], + "score": 1.0, + "content": "results of Tab. 2, we used the standard, publicly available code for", + "type": "text" + }, + { + "bbox": [ + 383, + 138, + 400, + 148 + ], + "score": 0.39, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 137, + 506, + 150 + ], + "score": 1.0, + "content": "together with the default", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 149, + 504, + 161 + ], + "spans": [ + { + "bbox": [ + 106, + 149, + 158, + 161 + ], + "score": 1.0, + "content": "training set", + "type": "text" + }, + { + "bbox": [ + 158, + 149, + 192, + 159 + ], + "score": 0.85, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 193, + 149, + 487, + 161 + ], + "score": 1.0, + "content": ") employed in the original n2v publication. We then applied the trained", + "type": "text" + }, + { + "bbox": [ + 487, + 149, + 504, + 159 + ], + "score": 0.48, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 159, + 505, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 159, + 279, + 172 + ], + "score": 1.0, + "content": "network to denoise the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 279, + 160, + 310, + 169 + ], + "score": 0.89, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 159, + 439, + 172 + ], + "score": 1.0, + "content": ". The resulting PSNR value was", + "type": "text" + }, + { + "bbox": [ + 440, + 159, + 477, + 170 + ], + "score": 0.84, + "content": "3 2 . 1 0 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 159, + 505, + 172 + ], + "score": 1.0, + "content": "which", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 170, + 505, + 182 + ], + "spans": [ + { + "bbox": [ + 106, + 171, + 116, + 182 + ], + "score": 1.0, + "content": "is", + "type": "text" + }, + { + "bbox": [ + 116, + 170, + 149, + 181 + ], + "score": 0.87, + "content": "0 . 7 6 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 149, + 171, + 309, + 182 + ], + "score": 1.0, + "content": "lower than the PSNR value for BM3D", + "type": "text" + }, + { + "bbox": [ + 309, + 171, + 352, + 181 + ], + "score": 0.77, + "content": "( 3 2 . 8 6 d B )", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 171, + 505, + 182 + ], + "score": 1.0, + "content": ". The difference is consistent with an", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 181, + 505, + 193 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 152, + 193 + ], + "score": 1.0, + "content": "on average", + "type": "text" + }, + { + "bbox": [ + 152, + 181, + 184, + 192 + ], + "score": 0.86, + "content": "0 . 8 8 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 185, + 181, + 274, + 193 + ], + "score": 1.0, + "content": "lower performance of", + "type": "text" + }, + { + "bbox": [ + 274, + 182, + 291, + 192 + ], + "score": 0.44, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 291, + 181, + 505, + 193 + ], + "score": 1.0, + "content": "compared to BM3D on the BSD68 test set (see Krull", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 192, + 505, + 205 + ], + "spans": [ + { + "bbox": [ + 105, + 192, + 505, + 205 + ], + "score": 1.0, + "content": "et al., 2019). The same network can also be used to denoise an image with lower or higher noise", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 203, + 504, + 215 + ], + "spans": [ + { + "bbox": [ + 105, + 203, + 151, + 215 + ], + "score": 1.0, + "content": "level. The", + "type": "text" + }, + { + "bbox": [ + 151, + 204, + 168, + 214 + ], + "score": 0.28, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 169, + 203, + 249, + 215 + ], + "score": 1.0, + "content": "network trained on", + "type": "text" + }, + { + "bbox": [ + 250, + 203, + 283, + 213 + ], + "score": 0.9, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 203, + 466, + 215 + ], + "score": 1.0, + "content": "does, for instance, result in PSNR values of", + "type": "text" + }, + { + "bbox": [ + 467, + 203, + 504, + 213 + ], + "score": 0.8, + "content": "3 2 . 9 3 d B", + "type": "inline_equation" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 213, + 504, + 226 + ], + "spans": [ + { + "bbox": [ + 105, + 213, + 217, + 226 + ], + "score": 1.0, + "content": "for the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 217, + 214, + 250, + 224 + ], + "score": 0.9, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 213, + 279, + 226 + ], + "score": 1.0, + "content": "and in", + "type": "text" + }, + { + "bbox": [ + 280, + 214, + 317, + 225 + ], + "score": 0.86, + "content": "2 0 . 9 6 d B", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 213, + 429, + 226 + ], + "score": 1.0, + "content": "for the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 429, + 214, + 462, + 225 + ], + "score": 0.89, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 213, + 482, + 226 + ], + "score": 1.0, + "content": "(see", + "type": "text" + }, + { + "bbox": [ + 482, + 213, + 504, + 224 + ], + "score": 0.87, + "content": "n 2 v ^ { \\dagger }", + "type": "inline_equation" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 225, + 505, + 237 + ], + "spans": [ + { + "bbox": [ + 105, + 225, + 505, + 237 + ], + "score": 1.0, + "content": "in Tab. 4). Especially for high noise levels performance can be much improved, however, if the n2v", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 237, + 505, + 248 + ], + "spans": [ + { + "bbox": [ + 106, + 237, + 505, + 248 + ], + "score": 1.0, + "content": "network is trained using images with the same noise level as the test image. In order to do so, we", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 247, + 505, + 259 + ], + "spans": [ + { + "bbox": [ + 106, + 247, + 266, + 259 + ], + "score": 1.0, + "content": "followed the procedure described in the", + "type": "text" + }, + { + "bbox": [ + 266, + 248, + 283, + 258 + ], + "score": 0.45, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 247, + 463, + 259 + ], + "score": 1.0, + "content": "publication while adapting the noise level of", + "type": "text" + }, + { + "bbox": [ + 463, + 247, + 494, + 257 + ], + "score": 0.89, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 494, + 247, + 505, + 259 + ], + "score": 1.0, + "content": "in", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 258, + 506, + 270 + ], + "spans": [ + { + "bbox": [ + 105, + 258, + 160, + 270 + ], + "score": 1.0, + "content": "one case and", + "type": "text" + }, + { + "bbox": [ + 160, + 258, + 191, + 268 + ], + "score": 0.9, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 258, + 506, + 270 + ], + "score": 1.0, + "content": "for the other case. Trained on a dataset with matched noise, we then denoised", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 268, + 505, + 281 + ], + "spans": [ + { + "bbox": [ + 105, + 268, + 202, + 281 + ], + "score": 1.0, + "content": "the ‘house’ image with", + "type": "text" + }, + { + "bbox": [ + 203, + 269, + 235, + 279 + ], + "score": 0.89, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 236, + 268, + 300, + 281 + ], + "score": 1.0, + "content": "in the one, and", + "type": "text" + }, + { + "bbox": [ + 300, + 269, + 333, + 279 + ], + "score": 0.89, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 268, + 472, + 281 + ], + "score": 1.0, + "content": "in the other case (results listed as", + "type": "text" + }, + { + "bbox": [ + 472, + 268, + 493, + 280 + ], + "score": 0.88, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 268, + 505, + 281 + ], + "score": 1.0, + "content": "in", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 279, + 506, + 292 + ], + "spans": [ + { + "bbox": [ + 105, + 279, + 506, + 292 + ], + "score": 1.0, + "content": "Tab. 4). The PSNR values obtained for ‘house’ in this matched-noise-level scenario are much higher", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 290, + 506, + 303 + ], + "spans": [ + { + "bbox": [ + 105, + 290, + 362, + 303 + ], + "score": 1.0, + "content": "compared to the scenario with unmatched noise level (e.g., for", + "type": "text" + }, + { + "bbox": [ + 362, + 291, + 396, + 301 + ], + "score": 0.9, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 290, + 506, + 303 + ], + "score": 1.0, + "content": "the PSNR improvement is", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 302, + 506, + 315 + ], + "spans": [ + { + "bbox": [ + 105, + 302, + 419, + 315 + ], + "score": 1.0, + "content": "approximately 8 dB). The much lower performance for mismatched noise for", + "type": "text" + }, + { + "bbox": [ + 419, + 302, + 436, + 312 + ], + "score": 0.36, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 436, + 302, + 506, + 315 + ], + "score": 1.0, + "content": "is in this respect", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 312, + 505, + 325 + ], + "spans": [ + { + "bbox": [ + 106, + 312, + 505, + 325 + ], + "score": 1.0, + "content": "consistent with observations for standard DNN denoising for which training with the ground-truth", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 104, + 322, + 505, + 338 + ], + "spans": [ + { + "bbox": [ + 104, + 322, + 505, + 338 + ], + "score": 1.0, + "content": "noise level has been pointed out as important for performance (Chaudhury & Roy, 2017; Zhang", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 334, + 158, + 346 + ], + "spans": [ + { + "bbox": [ + 105, + 334, + 158, + 346 + ], + "score": 1.0, + "content": "et al., 2018).", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 11.5, + "bbox_fs": [ + 104, + 82, + 506, + 346 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 351, + 505, + 429 + ], + "lines": [ + { + "bbox": [ + 105, + 350, + 505, + 364 + ], + "spans": [ + { + "bbox": [ + 105, + 350, + 124, + 364 + ], + "score": 1.0, + "content": "The", + "type": "text" + }, + { + "bbox": [ + 125, + 352, + 142, + 362 + ], + "score": 0.47, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 350, + 505, + 364 + ], + "score": 1.0, + "content": "approach can avoid having to know the exact noise level, e.g., if it is trained on just the", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 362, + 506, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 506, + 375 + ], + "score": 1.0, + "content": "single noisy image. In a last experiment, we hence investigated this ‘zero-shot’ denoising feature", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 372, + 505, + 387 + ], + "spans": [ + { + "bbox": [ + 105, + 372, + 505, + 387 + ], + "score": 1.0, + "content": "of n2v and applied the algorithm to denoise the ‘house’ image while using the same noisy image", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 385, + 505, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 385, + 410, + 397 + ], + "score": 1.0, + "content": "for training that we seek to denoise (we took the publicly available code of", + "type": "text" + }, + { + "bbox": [ + 411, + 385, + 427, + 395 + ], + "score": 0.43, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 385, + 505, + 397 + ], + "score": 1.0, + "content": "as an example and", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 394, + 506, + 408 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 506, + 408 + ], + "score": 1.0, + "content": "manually adjusted hyperparameters as follows: we set the ”Percentage of pixel to manipulate per", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 406, + 506, + 418 + ], + "spans": [ + { + "bbox": [ + 105, + 406, + 506, + 418 + ], + "score": 1.0, + "content": "patch” to a value of 0.4, as ”Number of training epochs” we used 400 and we set the ”Number of", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 417, + 496, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 418, + 434, + 429 + ], + "score": 1.0, + "content": "parameter update steps per epoch” to 33). The obtained PSNR values are listed as", + "type": "text" + }, + { + "bbox": [ + 435, + 417, + 455, + 428 + ], + "score": 0.85, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ast }", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 418, + 496, + 429 + ], + "score": 1.0, + "content": "in Tab. 4.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 27, + "bbox_fs": [ + 105, + 350, + 506, + 429 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 434, + 505, + 555 + ], + "lines": [ + { + "bbox": [ + 105, + 433, + 505, + 446 + ], + "spans": [ + { + "bbox": [ + 105, + 433, + 405, + 446 + ], + "score": 1.0, + "content": "From Tab. 4 it can be observed, that for all considered training settings of", + "type": "text" + }, + { + "bbox": [ + 405, + 435, + 422, + 444 + ], + "score": 0.54, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 422, + 433, + 505, + 446 + ], + "score": 1.0, + "content": "and all noise levels,", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 444, + 506, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 444, + 351, + 457 + ], + "score": 1.0, + "content": "PSNR values of TVAE are consistently higher than those of", + "type": "text" + }, + { + "bbox": [ + 351, + 446, + 368, + 456 + ], + "score": 0.3, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 444, + 399, + 457 + ], + "score": 1.0, + "content": "even if", + "type": "text" + }, + { + "bbox": [ + 399, + 446, + 416, + 456 + ], + "score": 0.45, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 444, + 506, + 457 + ], + "score": 1.0, + "content": "is trained on external", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 456, + 505, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 472, + 469 + ], + "score": 1.0, + "content": "data with matched-noise level. Additional parameter tuning may improve performance of", + "type": "text" + }, + { + "bbox": [ + 472, + 456, + 493, + 466 + ], + "score": 0.86, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ast }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 456, + 505, + 469 + ], + "score": 1.0, + "content": "to", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 466, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 467, + 347, + 479 + ], + "score": 1.0, + "content": "a certain extent but PSNRs are in general much lower than", + "type": "text" + }, + { + "bbox": [ + 347, + 466, + 367, + 478 + ], + "score": 0.87, + "content": "\\mathrm { \\hat { n } } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 368, + 467, + 468, + 479 + ], + "score": 1.0, + "content": ". While we followed for", + "type": "text" + }, + { + "bbox": [ + 468, + 467, + 489, + 478 + ], + "score": 0.87, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 467, + 505, + 479 + ], + "score": 1.0, + "content": "the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 478, + 505, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 478, + 405, + 490 + ], + "score": 1.0, + "content": "standard hyperparameter setting of the original paper/code publication of", + "type": "text" + }, + { + "bbox": [ + 405, + 479, + 422, + 489 + ], + "score": 0.41, + "content": "\\mathbf { n } 2 \\mathbf { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 423, + 478, + 505, + 490 + ], + "score": 1.0, + "content": "(Krull et al., 2019),", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 489, + 504, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 504, + 501 + ], + "score": 1.0, + "content": "we cannot exclude further improvements with parameter fine tuning for the ‘house’ benchmark.", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 499, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 106, + 500, + 283, + 511 + ], + "score": 1.0, + "content": "However, we remark that the difference of", + "type": "text" + }, + { + "bbox": [ + 284, + 499, + 304, + 510 + ], + "score": 0.88, + "content": "\\mathrm { n } 2 \\mathrm { v } ^ { \\ddag }", + "type": "inline_equation" + }, + { + "bbox": [ + 305, + 500, + 505, + 511 + ], + "score": 1.0, + "content": "and BM3D for the ‘house’ benchmark is on the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 511, + 505, + 523 + ], + "score": 1.0, + "content": "very same range as the differences between n2v and BM3D as reported on the BSD data set in the", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 522, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 105, + 522, + 505, + 534 + ], + "score": 1.0, + "content": "original n2v publication. The stronger performing BM3D is according to denoising performance the", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 533, + 505, + 545 + ], + "spans": [ + { + "bbox": [ + 105, + 533, + 428, + 545 + ], + "score": 1.0, + "content": "preferable comparison and as such included in Tab. 2. In terms of efficiency, the", + "type": "text" + }, + { + "bbox": [ + 429, + 533, + 446, + 543 + ], + "score": 0.26, + "content": "\\mathrm { n } 2 \\mathrm { v }", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 533, + 505, + 545 + ], + "score": 1.0, + "content": "approach is in", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 544, + 380, + 556 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 380, + 556 + ], + "score": 1.0, + "content": "general (once trained) faster than BM3D as well as TVAE, however.", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 36, + "bbox_fs": [ + 105, + 433, + 506, + 556 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 560, + 505, + 649 + ], + "lines": [ + { + "bbox": [ + 105, + 560, + 505, + 573 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 222, + 573 + ], + "score": 1.0, + "content": "PSNR values of noise2noise", + "type": "text" + }, + { + "bbox": [ + 222, + 561, + 244, + 572 + ], + "score": 0.35, + "content": "( \\mathtt { n 2 n } )", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 560, + 505, + 573 + ], + "score": 1.0, + "content": "are usually very closely aligned with PSNR values achievable by", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 572, + 505, + 584 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 263, + 584 + ], + "score": 1.0, + "content": "feed-forward DNNs. More concretely,", + "type": "text" + }, + { + "bbox": [ + 263, + 572, + 280, + 582 + ], + "score": 0.33, + "content": "\\mathfrak { n } 2 \\mathfrak { n }", + "type": "inline_equation" + }, + { + "bbox": [ + 280, + 572, + 505, + 584 + ], + "score": 1.0, + "content": "uses, for instance, a RED30 network (Mao et al., 2016)", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 582, + 505, + 594 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 505, + 594 + ], + "score": 1.0, + "content": "which achieves 31.07 dB PSNR on the BSD300 data set if trained on clean data. If directly trained", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 592, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 592, + 506, + 607 + ], + "score": 1.0, + "content": "on noisy data, RED30 achieves 31.06 dB (Lehtinen et al., 2018). n2n is thus strongly performing", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 605, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 106, + 605, + 506, + 617 + ], + "score": 1.0, + "content": "in terms of PSNR. The caveat of n2n compared to n2v is, however, that the noisy data n2n uses is", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 106, + 616, + 505, + 627 + ], + "spans": [ + { + "bbox": [ + 106, + 616, + 505, + 627 + ], + "score": 1.0, + "content": "rather artificial. The pairs of images n2n is trained on consist of two different noise realization of", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 626, + 506, + 639 + ], + "spans": [ + { + "bbox": [ + 105, + 626, + 506, + 639 + ], + "score": 1.0, + "content": "the same underlying clean image. For real data, such a setting is only approximately occurring at", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 637, + 289, + 650 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 289, + 650 + ], + "score": 1.0, + "content": "most, which has motivated the n2v approach.", + "type": "text" + } + ], + "index": 49 + } + ], + "index": 45.5, + "bbox_fs": [ + 105, + 560, + 506, + 650 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 654, + 504, + 699 + ], + "lines": [ + { + "bbox": [ + 105, + 654, + 506, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 506, + 667 + ], + "score": 1.0, + "content": "Like n2v, BDGAN and DPDNN are optimized for specific noise levels (specific standard deviations", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "are used to generate the noisy training examples). EPLL is trained exclusively on clean image", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 689 + ], + "score": 1.0, + "content": "patches; for denoising, the algorithm requires the ground-truth noise level of the test image as input", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 687, + 461, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 461, + 700 + ], + "score": 1.0, + "content": "parameter. Ground-truth noise level information is also required by KSVD and WNNM.", + "type": "text" + } + ], + "index": 53 + } + ], + "index": 51.5, + "bbox_fs": [ + 105, + 654, + 506, + 700 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 704, + 504, + 726 + ], + "lines": [ + { + "bbox": [ + 105, + 704, + 505, + 717 + ], + "spans": [ + { + "bbox": [ + 105, + 704, + 505, + 717 + ], + "score": 1.0, + "content": "Like all approaches in the top category of Tab. 2, TVAE does not require ground-truth noise level", + "type": "text" + } + ], + "index": 54 + }, + { + "bbox": [ + 106, + 715, + 505, + 727 + ], + "spans": [ + { + "bbox": [ + 106, + 715, + 505, + 727 + ], + "score": 1.0, + "content": "information, nor clean images, nor large amounts of training data. For the ‘zero-shot’ setting, TVAE", + "type": "text" + } + ], + "index": 55 + }, + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "score": 1.0, + "content": "is consequently the best performing system on the ‘house’ benchmark. Such a high performance is", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 94, + 504, + 105 + ], + "spans": [ + { + "bbox": [ + 105, + 94, + 401, + 105 + ], + "score": 1.0, + "content": "notably achieved using a basic DNN and relatively small patch sizes of", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 401, + 94, + 451, + 104 + ], + "score": 0.92, + "content": "D = 8 \\times 8", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 451, + 94, + 470, + 105 + ], + "score": 1.0, + "content": "(for", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 470, + 94, + 504, + 104 + ], + "score": 0.88, + "content": "\\sigma = 1 5", + "type": "inline_equation", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 124, + 117 + ], + "score": 1.0, + "content": "and", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 124, + 105, + 159, + 115 + ], + "score": 0.87, + "content": "\\sigma = 2 5", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 160, + 104, + 177, + 117 + ], + "score": 1.0, + "content": ") or", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 177, + 105, + 238, + 115 + ], + "score": 0.91, + "content": "D = 1 2 \\times 1 2", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 239, + 104, + 259, + 117 + ], + "score": 1.0, + "content": "(for", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 259, + 105, + 294, + 115 + ], + "score": 0.88, + "content": "\\sigma = 5 0", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 294, + 104, + 506, + 117 + ], + "score": 1.0, + "content": "). All feed-forward DNNs for denoising use much", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 222, + 128 + ], + "score": 1.0, + "content": "larger patches (e.g., n2v use", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 222, + 116, + 257, + 126 + ], + "score": 0.88, + "content": "6 4 \\times 6 4", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 258, + 115, + 506, + 128 + ], + "score": 1.0, + "content": "). That a competitive denoising performance can be achieved", + "type": "text", + "cross_page": true + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "score": 1.0, + "content": "for small patches, in general, argues in favor for VAE approaches to denoising. Indeed, TVAE", + "type": "text", + "cross_page": true + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "score": 1.0, + "content": "even comes close to state-of-the-art approaches (BDGAN and DPDNN) that use very intricate DNN", + "type": "text", + "cross_page": true + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 149, + 505, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 149, + 505, + 160 + ], + "score": 1.0, + "content": "architectures and large amounts of clean training data. We believe that such results underline the", + "type": "text", + "cross_page": true + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 159, + 506, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 159, + 506, + 172 + ], + "score": 1.0, + "content": "potential of the here investigated approach although the novelty of the approach is the focus rather", + "type": "text", + "cross_page": true + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 168, + 228, + 184 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 228, + 184 + ], + "score": 1.0, + "content": "than extensive benchmarking.", + "type": "text", + "cross_page": true + } + ], + "index": 8 + } + ], + "index": 54.5, + "bbox_fs": [ + 105, + 704, + 505, + 727 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 182 + ], + "lines": [ + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 106, + 83, + 505, + 95 + ], + "score": 1.0, + "content": "is consequently the best performing system on the ‘house’ benchmark. Such a high performance is", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 94, + 504, + 105 + ], + "spans": [ + { + "bbox": [ + 105, + 94, + 401, + 105 + ], + "score": 1.0, + "content": "notably achieved using a basic DNN and relatively small patch sizes of", + "type": "text" + }, + { + "bbox": [ + 401, + 94, + 451, + 104 + ], + "score": 0.92, + "content": "D = 8 \\times 8", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 94, + 470, + 105 + ], + "score": 1.0, + "content": "(for", + "type": "text" + }, + { + "bbox": [ + 470, + 94, + 504, + 104 + ], + "score": 0.88, + "content": "\\sigma = 1 5", + "type": "inline_equation" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 104, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 104, + 124, + 117 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 124, + 105, + 159, + 115 + ], + "score": 0.87, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 104, + 177, + 117 + ], + "score": 1.0, + "content": ") or", + "type": "text" + }, + { + "bbox": [ + 177, + 105, + 238, + 115 + ], + "score": 0.91, + "content": "D = 1 2 \\times 1 2", + "type": "inline_equation" + }, + { + "bbox": [ + 239, + 104, + 259, + 117 + ], + "score": 1.0, + "content": "(for", + "type": "text" + }, + { + "bbox": [ + 259, + 105, + 294, + 115 + ], + "score": 0.88, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 104, + 506, + 117 + ], + "score": 1.0, + "content": "). All feed-forward DNNs for denoising use much", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 115, + 506, + 128 + ], + "spans": [ + { + "bbox": [ + 105, + 115, + 222, + 128 + ], + "score": 1.0, + "content": "larger patches (e.g., n2v use", + "type": "text" + }, + { + "bbox": [ + 222, + 116, + 257, + 126 + ], + "score": 0.88, + "content": "6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 115, + 506, + 128 + ], + "score": 1.0, + "content": "). That a competitive denoising performance can be achieved", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 506, + 140 + ], + "score": 1.0, + "content": "for small patches, in general, argues in favor for VAE approaches to denoising. Indeed, TVAE", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "spans": [ + { + "bbox": [ + 105, + 137, + 505, + 150 + ], + "score": 1.0, + "content": "even comes close to state-of-the-art approaches (BDGAN and DPDNN) that use very intricate DNN", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 149, + 505, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 149, + 505, + 160 + ], + "score": 1.0, + "content": "architectures and large amounts of clean training data. We believe that such results underline the", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 159, + 506, + 172 + ], + "spans": [ + { + "bbox": [ + 105, + 159, + 506, + 172 + ], + "score": 1.0, + "content": "potential of the here investigated approach although the novelty of the approach is the focus rather", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 168, + 228, + 184 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 228, + 184 + ], + "score": 1.0, + "content": "than extensive benchmarking.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 4 + }, + { + "type": "text", + "bbox": [ + 106, + 187, + 505, + 362 + ], + "lines": [ + { + "bbox": [ + 106, + 186, + 505, + 199 + ], + "spans": [ + { + "bbox": [ + 106, + 186, + 505, + 199 + ], + "score": 1.0, + "content": "On the other hand, an important limitation of TVAE is its computational demand. For our exper-", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 197, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 106, + 197, + 294, + 210 + ], + "score": 1.0, + "content": "iments on the ‘house’ image with noise level", + "type": "text" + }, + { + "bbox": [ + 295, + 198, + 329, + 208 + ], + "score": 0.89, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 197, + 406, + 210 + ], + "score": 1.0, + "content": "in Tab. 2 we used", + "type": "text" + }, + { + "bbox": [ + 406, + 198, + 459, + 209 + ], + "score": 0.9, + "content": "N = 6 0 0 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 197, + 505, + 210 + ], + "score": 1.0, + "content": "patches of", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 208, + 505, + 222 + ], + "spans": [ + { + "bbox": [ + 106, + 209, + 167, + 220 + ], + "score": 0.9, + "content": "D = 1 2 \\times 1 2", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 208, + 505, + 222 + ], + "score": 1.0, + "content": "pixels, which amounts to all possible non-overlapping square patches of that size", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 220, + 504, + 232 + ], + "spans": [ + { + "bbox": [ + 106, + 220, + 463, + 232 + ], + "score": 1.0, + "content": "that can be extracted from the image. For training and denoising we used a TVAE with", + "type": "text" + }, + { + "bbox": [ + 464, + 220, + 504, + 231 + ], + "score": 0.89, + "content": "H = 5 1 2", + "type": "inline_equation" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 229, + 506, + 246 + ], + "spans": [ + { + "bbox": [ + 104, + 229, + 205, + 246 + ], + "score": 1.0, + "content": "latent variables, sizes of", + "type": "text" + }, + { + "bbox": [ + 205, + 231, + 253, + 245 + ], + "score": 0.93, + "content": "| { \\Phi } ^ { ( n ) } | = 6 4 ", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 229, + 506, + 246 + ], + "score": 1.0, + "content": ", and 512 units in the DNN middle layer of the decoder. TVAE", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 244, + 505, + 257 + ], + "spans": [ + { + "bbox": [ + 106, + 244, + 468, + 257 + ], + "score": 1.0, + "content": "training required 49 seconds per training epoch when executing on a single NVIDIA Titan", + "type": "text" + }, + { + "bbox": [ + 468, + 245, + 482, + 256 + ], + "score": 0.32, + "content": "\\mathrm { X p }", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 244, + 505, + 257 + ], + "score": 1.0, + "content": "GPU", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 254, + 505, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 254, + 123, + 268 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 255, + 153, + 266 + ], + "score": 0.41, + "content": "2 . 5 \\mathrm { G B }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 254, + 505, + 268 + ], + "score": 1.0, + "content": "of GPU memory. We ran for 500 epochs which required between seven and eight hours", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 266, + 505, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 266, + 505, + 279 + ], + "score": 1.0, + "content": "on the single GPU. We did not observe significant changes in variational bound values or in de-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 277, + 505, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 277, + 505, + 289 + ], + "score": 1.0, + "content": "noising performance after 500 epochs in any of the experiments we conducted for Tabs 1 and 2.", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 288, + 506, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 382, + 300 + ], + "score": 1.0, + "content": "Runtime complexity increased linear with the number of data points", + "type": "text" + }, + { + "bbox": [ + 383, + 289, + 393, + 298 + ], + "score": 0.78, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 288, + 506, + 300 + ], + "score": 1.0, + "content": ", with the dimensionality of", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 298, + 506, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 298, + 141, + 311 + ], + "score": 1.0, + "content": "the data", + "type": "text" + }, + { + "bbox": [ + 142, + 300, + 151, + 309 + ], + "score": 0.8, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 298, + 281, + 311 + ], + "score": 1.0, + "content": ", with the number of the latents", + "type": "text" + }, + { + "bbox": [ + 281, + 300, + 291, + 309 + ], + "score": 0.81, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 298, + 506, + 311 + ], + "score": 1.0, + "content": ", and with the size of the DNN used. Runtimes also", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 309, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 104, + 309, + 329, + 326 + ], + "score": 1.0, + "content": "increased approximately proportional w.r.t. the size of", + "type": "text" + }, + { + "bbox": [ + 329, + 309, + 347, + 322 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 309, + 506, + 326 + ], + "score": 1.0, + "content": ". 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In general, if the patch size", + "type": "text" + }, + { + "bbox": [ + 494, + 381, + 504, + 391 + ], + "score": 0.72, + "content": "D", + "type": "inline_equation" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 392, + 506, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 392, + 506, + 404 + ], + "score": 1.0, + "content": "is increased, more structure has to be captured. This can be done either by increasing the size of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 402, + 506, + 415 + ], + "spans": [ + { + "bbox": [ + 105, + 402, + 195, + 415 + ], + "score": 1.0, + "content": "the stochastic latents", + "type": "text" + }, + { + "bbox": [ + 195, + 403, + 205, + 412 + ], + "score": 0.77, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 402, + 506, + 415 + ], + "score": 1.0, + "content": "or by using larger DNNs. Both, in turn, requires more training data in", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 414, + 505, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 414, + 466, + 426 + ], + "score": 1.0, + "content": "order to estimate the increased number of parameters. In the current setup, the sizes of", + "type": "text" + }, + { + "bbox": [ + 466, + 414, + 476, + 424 + ], + "score": 0.76, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 414, + 505, + 426 + ], + "score": 1.0, + "content": "which", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 425, + 505, + 437 + ], + "spans": [ + { + "bbox": [ + 106, + 425, + 505, + 437 + ], + "score": 1.0, + "content": "are currently feasible are comparably small. The denoising performance based on small patches is,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 436, + 220, + 448 + ], + "spans": [ + { + "bbox": [ + 105, + 436, + 220, + 448 + ], + "score": 1.0, + "content": "however, notably very high.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 27 + }, + { + "type": "text", + "bbox": [ + 106, + 452, + 505, + 552 + ], + "lines": [ + { + "bbox": [ + 106, + 453, + 505, + 465 + ], + "spans": [ + { + "bbox": [ + 106, + 453, + 240, + 465 + ], + "score": 1.0, + "content": "For comparison, n2v uses up to", + "type": "text" + }, + { + "bbox": [ + 240, + 453, + 301, + 463 + ], + "score": 0.9, + "content": "D = 6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 301, + 453, + 505, + 465 + ], + "score": 1.0, + "content": "and also all other feed-forward DNN approaches", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "score": 1.0, + "content": "use significantly larger patch sizes than TVAE (and the other approaches in category 1). Still, n2v", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 474, + 506, + 487 + ], + "spans": [ + { + "bbox": [ + 105, + 474, + 506, + 487 + ], + "score": 1.0, + "content": "can be trained efficiently on large patches requiring approximately 19 hours on a NVIDIA Tesla", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 484, + 506, + 498 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 275, + 498 + ], + "score": 1.0, + "content": "K80 GPU for training on approximately", + "type": "text" + }, + { + "bbox": [ + 275, + 486, + 287, + 496 + ], + "score": 0.39, + "content": "3 \\mathrm { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 484, + 384, + 498 + ], + "score": 1.0, + "content": "noisy images of shape", + "type": "text" + }, + { + "bbox": [ + 384, + 486, + 420, + 496 + ], + "score": 0.69, + "content": "1 8 0 \\mathrm { x } 1 8 0", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 484, + 506, + 498 + ], + "score": 1.0, + "content": "and seconds for the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 496, + 506, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 496, + 506, + 509 + ], + "score": 1.0, + "content": "denoising of one 256x256 image. The higher computational demand of TVAE is also the reason", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 507, + 506, + 521 + ], + "spans": [ + { + "bbox": [ + 105, + 507, + 506, + 521 + ], + "score": 1.0, + "content": "why averaging across databases with many images (such as BSD68) or applications to large single", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 518, + 505, + 531 + ], + "spans": [ + { + "bbox": [ + 106, + 518, + 505, + 531 + ], + "score": 1.0, + "content": "images quickly becomes infeasible. As a novel approach, TVAE is, however, far from being fully", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 529, + 506, + 542 + ], + "spans": [ + { + "bbox": [ + 105, + 529, + 506, + 542 + ], + "score": 1.0, + "content": "optimized algorithmically compared to large feed-forward approaches, and there is certainly further", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 540, + 266, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 540, + 266, + 554 + ], + "score": 1.0, + "content": "potential to improve training efficiency.", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 107, + 557, + 505, + 623 + ], + "lines": [ + { + "bbox": [ + 106, + 557, + 505, + 569 + ], + "spans": [ + { + "bbox": [ + 106, + 557, + 505, + 569 + ], + "score": 1.0, + "content": "While denoising is, in general, well suited for deep generative models, performance for standard", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 568, + 505, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 568, + 505, + 581 + ], + "score": 1.0, + "content": "image denoising is by far not as common as such results for standard DNNs (which may also be", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 578, + 506, + 592 + ], + "spans": [ + { + "bbox": [ + 105, + 578, + 506, + 592 + ], + "score": 1.0, + "content": "related to efficiency aspects). An exception is a recent GAN approach (BDGAN; Zhu et al., 2019).", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "score": 1.0, + "content": "VAEs are often evaluated using binarized MNIST with approximate log-likelihoods for comparison;", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 601, + 506, + 613 + ], + "spans": [ + { + "bbox": [ + 105, + 601, + 506, + 613 + ], + "score": 1.0, + "content": "that benchmark, however, is not consistent with the Gaussian noise model used here and does not", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 612, + 434, + 623 + ], + "spans": [ + { + "bbox": [ + 105, + 612, + 434, + 623 + ], + "score": 1.0, + "content": "allow a direct comparison with feed-forward DNNs which are the state-of-the-art.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 42.5 + } + ], + "page_idx": 18, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 300, + 751, + 311, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 313, + 764 + ], + "score": 1.0, + "content": "19", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 108, + 27, + 306, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 82, + 505, + 182 + ], + "lines": [], + "index": 4, + "bbox_fs": [ + 105, + 83, + 506, + 184 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 106, + 187, + 505, + 362 + ], + "lines": [ + { + "bbox": [ + 106, + 186, + 505, + 199 + ], + "spans": [ + { + "bbox": [ + 106, + 186, + 505, + 199 + ], + "score": 1.0, + "content": "On the other hand, an important limitation of TVAE is its computational demand. For our exper-", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 197, + 505, + 210 + ], + "spans": [ + { + "bbox": [ + 106, + 197, + 294, + 210 + ], + "score": 1.0, + "content": "iments on the ‘house’ image with noise level", + "type": "text" + }, + { + "bbox": [ + 295, + 198, + 329, + 208 + ], + "score": 0.89, + "content": "\\sigma = 5 0", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 197, + 406, + 210 + ], + "score": 1.0, + "content": "in Tab. 2 we used", + "type": "text" + }, + { + "bbox": [ + 406, + 198, + 459, + 209 + ], + "score": 0.9, + "content": "N = 6 0 0 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 197, + 505, + 210 + ], + "score": 1.0, + "content": "patches of", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 208, + 505, + 222 + ], + "spans": [ + { + "bbox": [ + 106, + 209, + 167, + 220 + ], + "score": 0.9, + "content": "D = 1 2 \\times 1 2", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 208, + 505, + 222 + ], + "score": 1.0, + "content": "pixels, which amounts to all possible non-overlapping square patches of that size", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 220, + 504, + 232 + ], + "spans": [ + { + "bbox": [ + 106, + 220, + 463, + 232 + ], + "score": 1.0, + "content": "that can be extracted from the image. For training and denoising we used a TVAE with", + "type": "text" + }, + { + "bbox": [ + 464, + 220, + 504, + 231 + ], + "score": 0.89, + "content": "H = 5 1 2", + "type": "inline_equation" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 229, + 506, + 246 + ], + "spans": [ + { + "bbox": [ + 104, + 229, + 205, + 246 + ], + "score": 1.0, + "content": "latent variables, sizes of", + "type": "text" + }, + { + "bbox": [ + 205, + 231, + 253, + 245 + ], + "score": 0.93, + "content": "| { \\Phi } ^ { ( n ) } | = 6 4 ", + "type": "inline_equation" + }, + { + "bbox": [ + 254, + 229, + 506, + 246 + ], + "score": 1.0, + "content": ", and 512 units in the DNN middle layer of the decoder. TVAE", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 244, + 505, + 257 + ], + "spans": [ + { + "bbox": [ + 106, + 244, + 468, + 257 + ], + "score": 1.0, + "content": "training required 49 seconds per training epoch when executing on a single NVIDIA Titan", + "type": "text" + }, + { + "bbox": [ + 468, + 245, + 482, + 256 + ], + "score": 0.32, + "content": "\\mathrm { X p }", + "type": "inline_equation" + }, + { + "bbox": [ + 482, + 244, + 505, + 257 + ], + "score": 1.0, + "content": "GPU", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 254, + 505, + 268 + ], + "spans": [ + { + "bbox": [ + 105, + 254, + 123, + 268 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 123, + 255, + 153, + 266 + ], + "score": 0.41, + "content": "2 . 5 \\mathrm { G B }", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 254, + 505, + 268 + ], + "score": 1.0, + "content": "of GPU memory. We ran for 500 epochs which required between seven and eight hours", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 266, + 505, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 266, + 505, + 279 + ], + "score": 1.0, + "content": "on the single GPU. We did not observe significant changes in variational bound values or in de-", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 277, + 505, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 277, + 505, + 289 + ], + "score": 1.0, + "content": "noising performance after 500 epochs in any of the experiments we conducted for Tabs 1 and 2.", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 288, + 506, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 382, + 300 + ], + "score": 1.0, + "content": "Runtime complexity increased linear with the number of data points", + "type": "text" + }, + { + "bbox": [ + 383, + 289, + 393, + 298 + ], + "score": 0.78, + "content": "N", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 288, + 506, + 300 + ], + "score": 1.0, + "content": ", with the dimensionality of", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 298, + 506, + 311 + ], + "spans": [ + { + "bbox": [ + 105, + 298, + 141, + 311 + ], + "score": 1.0, + "content": "the data", + "type": "text" + }, + { + "bbox": [ + 142, + 300, + 151, + 309 + ], + "score": 0.8, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 151, + 298, + 281, + 311 + ], + "score": 1.0, + "content": ", with the number of the latents", + "type": "text" + }, + { + "bbox": [ + 281, + 300, + 291, + 309 + ], + "score": 0.81, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 292, + 298, + 506, + 311 + ], + "score": 1.0, + "content": ", and with the size of the DNN used. Runtimes also", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 104, + 309, + 506, + 326 + ], + "spans": [ + { + "bbox": [ + 104, + 309, + 329, + 326 + ], + "score": 1.0, + "content": "increased approximately proportional w.r.t. the size of", + "type": "text" + }, + { + "bbox": [ + 329, + 309, + 347, + 322 + ], + "score": 0.9, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 309, + 506, + 326 + ], + "score": 1.0, + "content": ". Empirically we observed a sublinear", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 104, + 322, + 505, + 339 + ], + "spans": [ + { + "bbox": [ + 104, + 322, + 185, + 339 + ], + "score": 1.0, + "content": "scaling with |Φ(n) |", + "type": "text" + }, + { + "bbox": [ + 182, + 324, + 505, + 338 + ], + "score": 1.0, + "content": "presumably because of significant overhead computations: for example, increas-", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 103, + 334, + 505, + 353 + ], + "spans": [ + { + "bbox": [ + 103, + 334, + 144, + 353 + ], + "score": 1.0, + "content": "ing from", + "type": "text" + }, + { + "bbox": [ + 144, + 337, + 194, + 352 + ], + "score": 0.92, + "content": "| { \\boldsymbol { \\Phi } } ^ { ( n ) } | = 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 334, + 205, + 353 + ], + "score": 1.0, + "content": "to", + "type": "text" + }, + { + "bbox": [ + 205, + 336, + 259, + 352 + ], + "score": 0.92, + "content": "| { \\Phi } ^ { ( n ) } | = 1 2 8", + "type": "inline_equation" + }, + { + "bbox": [ + 260, + 334, + 505, + 353 + ], + "score": 1.0, + "content": "(while keeping all other parameters as above) computational", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 350, + 369, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 350, + 369, + 362 + ], + "score": 1.0, + "content": "time increases from 49 seconds per training epoch to 75 seconds.", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 16, + "bbox_fs": [ + 103, + 186, + 506, + 362 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 367, + 505, + 447 + ], + "lines": [ + { + "bbox": [ + 105, + 366, + 506, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 172, + 380 + ], + "score": 1.0, + "content": "For noise levels", + "type": "text" + }, + { + "bbox": [ + 173, + 368, + 204, + 378 + ], + "score": 0.9, + "content": "\\sigma = 1 5", + "type": "inline_equation" + }, + { + "bbox": [ + 205, + 366, + 223, + 380 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 223, + 367, + 255, + 378 + ], + "score": 0.89, + "content": "\\sigma = 2 5", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 366, + 409, + 380 + ], + "score": 1.0, + "content": "in Tab. 2 we used smaller patch sizes", + "type": "text" + }, + { + "bbox": [ + 410, + 367, + 459, + 378 + ], + "score": 0.88, + "content": "( D = 8 \\times 8 )", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 366, + 506, + 380 + ], + "score": 1.0, + "content": ") and fewer", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 103, + 376, + 504, + 394 + ], + "spans": [ + { + "bbox": [ + 103, + 376, + 181, + 394 + ], + "score": 1.0, + "content": "stochastic latents", + "type": "text" + }, + { + "bbox": [ + 182, + 381, + 220, + 392 + ], + "score": 0.85, + "content": "H = 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 220, + 376, + 267, + 394 + ], + "score": 1.0, + "content": ") but larger", + "type": "text" + }, + { + "bbox": [ + 267, + 378, + 286, + 391 + ], + "score": 0.89, + "content": "\\boldsymbol { \\Phi } ^ { ( n ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 376, + 311, + 394 + ], + "score": 1.0, + "content": "(i.e.,", + "type": "text" + }, + { + "bbox": [ + 311, + 378, + 369, + 393 + ], + "score": 0.92, + "content": "| { \\Phi } ^ { ( n ) } | = 2 0 \\bar { 0 } )", + "type": "inline_equation" + }, + { + "bbox": [ + 370, + 376, + 494, + 394 + ], + "score": 1.0, + "content": ". In general, if the patch size", + "type": "text" + }, + { + "bbox": [ + 494, + 381, + 504, + 391 + ], + "score": 0.72, + "content": "D", + "type": "inline_equation" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 392, + 506, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 392, + 506, + 404 + ], + "score": 1.0, + "content": "is increased, more structure has to be captured. This can be done either by increasing the size of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 402, + 506, + 415 + ], + "spans": [ + { + "bbox": [ + 105, + 402, + 195, + 415 + ], + "score": 1.0, + "content": "the stochastic latents", + "type": "text" + }, + { + "bbox": [ + 195, + 403, + 205, + 412 + ], + "score": 0.77, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 402, + 506, + 415 + ], + "score": 1.0, + "content": "or by using larger DNNs. Both, in turn, requires more training data in", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 414, + 505, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 414, + 466, + 426 + ], + "score": 1.0, + "content": "order to estimate the increased number of parameters. In the current setup, the sizes of", + "type": "text" + }, + { + "bbox": [ + 466, + 414, + 476, + 424 + ], + "score": 0.76, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 414, + 505, + 426 + ], + "score": 1.0, + "content": "which", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 425, + 505, + 437 + ], + "spans": [ + { + "bbox": [ + 106, + 425, + 505, + 437 + ], + "score": 1.0, + "content": "are currently feasible are comparably small. The denoising performance based on small patches is,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 436, + 220, + 448 + ], + "spans": [ + { + "bbox": [ + 105, + 436, + 220, + 448 + ], + "score": 1.0, + "content": "however, notably very high.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 27, + "bbox_fs": [ + 103, + 366, + 506, + 448 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 452, + 505, + 552 + ], + "lines": [ + { + "bbox": [ + 106, + 453, + 505, + 465 + ], + "spans": [ + { + "bbox": [ + 106, + 453, + 240, + 465 + ], + "score": 1.0, + "content": "For comparison, n2v uses up to", + "type": "text" + }, + { + "bbox": [ + 240, + 453, + 301, + 463 + ], + "score": 0.9, + "content": "D = 6 4 \\times 6 4", + "type": "inline_equation" + }, + { + "bbox": [ + 301, + 453, + 505, + 465 + ], + "score": 1.0, + "content": "and also all other feed-forward DNN approaches", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "spans": [ + { + "bbox": [ + 105, + 463, + 505, + 476 + ], + "score": 1.0, + "content": "use significantly larger patch sizes than TVAE (and the other approaches in category 1). Still, n2v", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 474, + 506, + 487 + ], + "spans": [ + { + "bbox": [ + 105, + 474, + 506, + 487 + ], + "score": 1.0, + "content": "can be trained efficiently on large patches requiring approximately 19 hours on a NVIDIA Tesla", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 484, + 506, + 498 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 275, + 498 + ], + "score": 1.0, + "content": "K80 GPU for training on approximately", + "type": "text" + }, + { + "bbox": [ + 275, + 486, + 287, + 496 + ], + "score": 0.39, + "content": "3 \\mathrm { k }", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 484, + 384, + 498 + ], + "score": 1.0, + "content": "noisy images of shape", + "type": "text" + }, + { + "bbox": [ + 384, + 486, + 420, + 496 + ], + "score": 0.69, + "content": "1 8 0 \\mathrm { x } 1 8 0", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 484, + 506, + 498 + ], + "score": 1.0, + "content": "and seconds for the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 496, + 506, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 496, + 506, + 509 + ], + "score": 1.0, + "content": "denoising of one 256x256 image. The higher computational demand of TVAE is also the reason", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 507, + 506, + 521 + ], + "spans": [ + { + "bbox": [ + 105, + 507, + 506, + 521 + ], + "score": 1.0, + "content": "why averaging across databases with many images (such as BSD68) or applications to large single", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 518, + 505, + 531 + ], + "spans": [ + { + "bbox": [ + 106, + 518, + 505, + 531 + ], + "score": 1.0, + "content": "images quickly becomes infeasible. As a novel approach, TVAE is, however, far from being fully", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 529, + 506, + 542 + ], + "spans": [ + { + "bbox": [ + 105, + 529, + 506, + 542 + ], + "score": 1.0, + "content": "optimized algorithmically compared to large feed-forward approaches, and there is certainly further", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 540, + 266, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 540, + 266, + 554 + ], + "score": 1.0, + "content": "potential to improve training efficiency.", + "type": "text" + } + ], + "index": 39 + } + ], + "index": 35, + "bbox_fs": [ + 105, + 453, + 506, + 554 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 557, + 505, + 623 + ], + "lines": [ + { + "bbox": [ + 106, + 557, + 505, + 569 + ], + "spans": [ + { + "bbox": [ + 106, + 557, + 505, + 569 + ], + "score": 1.0, + "content": "While denoising is, in general, well suited for deep generative models, performance for standard", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 568, + 505, + 581 + ], + "spans": [ + { + "bbox": [ + 105, + 568, + 505, + 581 + ], + "score": 1.0, + "content": "image denoising is by far not as common as such results for standard DNNs (which may also be", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 578, + 506, + 592 + ], + "spans": [ + { + "bbox": [ + 105, + 578, + 506, + 592 + ], + "score": 1.0, + "content": "related to efficiency aspects). An exception is a recent GAN approach (BDGAN; Zhu et al., 2019).", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "spans": [ + { + "bbox": [ + 105, + 589, + 505, + 603 + ], + "score": 1.0, + "content": "VAEs are often evaluated using binarized MNIST with approximate log-likelihoods for comparison;", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 601, + 506, + 613 + ], + "spans": [ + { + "bbox": [ + 105, + 601, + 506, + 613 + ], + "score": 1.0, + "content": "that benchmark, however, is not consistent with the Gaussian noise model used here and does not", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 612, + 434, + 623 + ], + "spans": [ + { + "bbox": [ + 105, + 612, + 434, + 623 + ], + "score": 1.0, + "content": "allow a direct comparison with feed-forward DNNs which are the state-of-the-art.", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 42.5, + "bbox_fs": [ + 105, + 557, + 506, 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Initialize model parameters Θ= {W,,²} Initialize eachΦ (n) with S distinct latent states repeat forall batches in dataset do forsample n in batch do (n) Φnew forall generations do
new = mutation (crossover (selection (Φnew))) Φ (n) Φ (n) UΦnew
end for (n) to S fitest elements based on (9)
TruncateΦ end for Use Adam to update W using objective (4)
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n2v*32.0529.2025.42
n2vt32.9332.1020.96
n2vt33.9132.1028.94
TVAE34.27 ± .0232.65 ± .0629.98 ± .05
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Neural network units Input (H) 64 (512) Middle 64 (512)
Output (D) 64 (144) Cyclic Learning Rates
Min 1.r. 0.0001
Max l.r. 0.01 (0.05)
Epochs/cycle 20 Batch size 32
Evolutionaryparameters
Parents 10 (5) Children 9 (4) Generations 4(1)
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a/parse/train/SUyxNGzUsH/SUyxNGzUsH.md b/parse/train/SUyxNGzUsH/SUyxNGzUsH.md new file mode 100644 index 0000000000000000000000000000000000000000..cdc6dc25c94a3265ce47287ad3de643082f0ee53 --- /dev/null +++ b/parse/train/SUyxNGzUsH/SUyxNGzUsH.md @@ -0,0 +1,386 @@ +# VILNMN: A NEURAL MODULE NETWORK APPROACHTO VIDEO-GROUNDED LANGUAGE TASKS + +Anonymous authors Paper under double-blind review + +# ABSTRACT + +Neural module networks (NMN) have achieved success in image-grounded tasks such as Visual Question Answering (VQA) on synthetic images. However, very limited work on NMN has been studied in the video-grounded language tasks. These tasks extend the complexity of traditional visual tasks with the additional visual temporal variance. Motivated by recent NMN approaches on image-grounded tasks, we introduce Visio-Linguistic Neural Module Network (VilNMN) to model the information retrieval process in video-grounded language tasks as a pipeline of neural modules. VilNMN first decomposes all language components to explicitly resolve any entity references and detect corresponding action-based inputs from the question. The detected entities and actions are used as parameters to instantiate neural module networks and extract visual cues from the video. Our experiments show that VilNMN can achieve promising performance on two video-grounded language tasks: video QA and video-grounded dialogues. + +# 1 INTRODUCTION + +Vision-language tasks have been studied to build intelligent systems that can perceive information from multiple modalities, such as images, videos, and text. Extended from imaged-grounded tasks, e.g. (Antol et al., 2015), recently Jang et al. (2017); Lei et al. (2018) propose to use video as the grounding features. This modification poses a significant challenge to previous image-based models with the additional temporal variance through video frames. Recently Alamri et al. (2019) further develop video-grounded language research into the dialogue domain. In the proposed task, videogrounded dialogues, the dialogue agent is required to answer questions about a video over multiple dialogue turns. Using Figure 1 as an example, to answer questions correctly, a dialogue agent has to resolve references in dialogue context, e.g. “he” and “it”, and identify the original entity, e.g. “a boy" and “a backpack". In addition, the dialogue agent also needs to identify the actions of these entities, e.g. “carrying a backpack” to retrieve information along the temporal dimension of the video. + +Current state-of-the-art approaches to video-grounded language tasks, e.g. (Le et al., 2019b; Fan et al., 2019) have achieved remarkable performance through the use of deep neural networks to retrieve grounding video signals based on language inputs. However, these approaches often assume the reasoning structure, including resolving references of entities and detecting the corresponding actions to retrieve visual cues, is implicitly learned. An explicit reasoning structure becomes more beneficial as the tasks complicates in two scenarios: video with complex spatial and temporal dynamics, and language inputs with sophisticated semantic dependencies, e.g. questions positioned in a dialogue context. In these cases, it becomes challenging to interpret model outputs, assess model reasoning capability, and identify errors in neural network models. + +Similar challenges have been observed in image-grounded tasks in which deep neural networks often exhibit shallow understanding capability as they simply exploit superficial visual cues (Agrawal et al., 2016; Goyal et al., 2017; Feng et al., 2018; Serrano & Smith, 2019). Andreas et al. (2016b) propose neural model networks (NMNs) by decomposing a question into sub-sequences called program and assembling a network of neural operations. Motivated by this line of research, we propose an NMN approach to video-grounded language tasks. Our approach benefits from integrating neural networks with a compositional reasoning structure to exploit low-level information signals in video. An example of the reasoning structure can be seen on the right side of Figure 1. + +![](images/08dfa3054943d0f06eb58bf4e0e2e48e82ee934f1926997c0219cf2c8c6783ea.jpg) +Figure 1: A sample video-grounded dialogue: Inputs are question, dialogue history, video with caption, visual and audio input, and the output is the answer to the question. On the right side, we demonstrate an example symbolic reasoning process a dialogue agent can perform to extract textual and visual clues for the answer. + +We propose Visio-Linguistic Neural Module Network (VilNMN) for video-grounded language tasks. VilNMN leverages entity-based dialogue representations as inputs to neural operations on spatial and temporal-level visual features. Previous approaches exploit question-level and token-level representations to extract question-dependent information from video (Jang et al., 2017; Fan et al., 2019; Le et al., 2019b). In complex videos with many entities or actions, these approaches might not be optimal to locate the right features. To exploit object-level features, VilNMN is trained to identify relevant entities first, and then to extract the temporal steps using detected actions of these entities. + +VilNMN is also trained to resolve any co-references in language inputs, e.g. questions in a dialogue context, to identify the original entities. Previous approaches to video-grounded dialogues often obtain question global representations in relation to dialogue context. These approaches might be suitable to represent general semantics in open-domain or chit-chat dialogues (Serban et al., 2016; Li et al., 2016) but they are not ideal to detect fine-grained entity-based information as the dialogue context evolves over time. + +In summary, we introduce a neural module network approach to video-grounded language tasks through a reasoning pipeline with entity and action representations applied on the spatio-temporal dynamics of video. To cater to complex semantic inputs in language inputs, e.g. dialogues, our approach also allows models to resolve entity references to incorporate question representations with fine-grained entity information. In our evaluation, we achieve competitive performance on the large-scale benchmark Audio-visual Scene-aware Dialogues (AVSD) (Alamri et al., 2019). We also adapt VilNMN for video QA and obtain the state-of-the-art on the TGIF-QA benchmark (Jang et al., 2017) across all tasks. Our experiments and ablation analysis indicate a potential direction to develop compositional and interpretable neural models for video-grounded language tasks. + +# 2 RELATED WORK + +Video QA has been a proxy for evaluating a model’s understanding capability of language and video and the task is treated as a visual information retrieval task. Jang et al. (2017); Gao et al. (2018); Jiang et al. (2020) propose to learn attention guided by question global representation to retrieve spatial-level and temporal-level visual features. Li et al. (2019); Fan et al. (2019); Jiang & Han (2020) model interaction between all pairs of question token-level representations and temporal-level features of input video. Extended from video QA, video-grounded dialogue is an emerging task that combines dialogue response generation and video-language understanding research. Nguyen et al. (2018); Hori et al. (2019); Hori et al. (2019); Sanabria et al. (2019); Le et al. (2019a;b) extend traditional QA models by adding dialogue history neural encoders. Kumar et al. (2019) enhances dialogue features with topic-level representations to express the general topic in each dialogue. Sanabria et al. (2019) considers the task as a video summary task and concatenates question and dialogue history into a single sequence and proposes to transfer parameter weights from a large-scale video summary model. Different from prior work, we dissect the question sequence and explicitly detect and decode any entities and their references. Our models also benefit from the additional insights on how models learn to use component linguistic inputs for extraction of visual information. + +![](images/c1042d57aa0064953fc1ccfac4878bbe8349871223ee844ed91ddeaf1edb3ed5.jpg) +Figure 2: VilNMN includes 4 major components: (1) encoders that encode dialogue and video components into continuous vector representations; (2) question parsers that parse question of the current dialogue turn into compositional programs for dialogue and video understanding; (3) an inventory of neural modules that operate on dialogue and video input components; and (4) a response decoder that generates natural language sequence using dialogue-based and video-based execution outputs. + +Extending from the line of research on neural semantic parsing (Jia & Liang, 2016; Liang et al., 2017), Andreas et al. (2016b;a) introduce NMNs to address visual QA by decomposing questions into linguistic sub-structures, known as programs, to instantiate a network of neural modules. NMN models have achieved significant success in synthetic image domains where complex reasoning process is required (Johnson et al., 2017b; Hu et al., 2018; Han et al., 2019). Our work is related to the recent work that extends NMN models to real data domains. For instance, Kottur et al. (2018); Jiang & Bansal (2019); Gupta et al. (2020) extend NMNs to visual dialogues and reading comprehension tasks. In this paper, we introduce a new approach that exploits NMN to learn dependencies between the lexical composition in language inputs and the spatio-temporal dynamics in videos. This is not present in prior NMN models which are designed to apply on a two-dimensional image input without temporal variance. In video represented as sequence of images, each represented by object-level features, applying prior NMN models require aggregating frame-level features, e.g. through average pooling, resulting in potential loss of information. An alternative solution is a late-fusion method in which an NMN model performs reasoning structure programs on sampled video frames only. An object tracking mechanism or attention mechanism is then used to fuse the output representations. Instead, we propose to construct a reasoning structure with multi-step interaction between the space-time information in video with entity-action detected in text. + +# 3 METHOD + +In this section, we present the design of our model, called Visio-Linguistic Neural Module Networks (VilNMN). An overview of the model can be seen in Figure 2. The input to the model consists of a dialogue $\mathcal { D }$ which is grounded on a video $\nu$ . The input components include the question of current dialogue turn $\mathcal { Q }$ , dialogue history $\mathcal { H }$ , and the features of input video, including visual and audio input. The output is a dialogue response, denoted as $\mathcal { R }$ . Each text input component is a sequence of words $w _ { 1 } , . . . , \bar { w } _ { m } \in \mathbb { V } ^ { i n }$ , the input vocabulary. Similarly, the output response $\mathcal { R }$ is a sequence of tokens $w _ { 1 } , . . . , w _ { n } \in \mathbb { V } ^ { o u t }$ , the output vocabulary. + +To learn compositional programs, we follow Johnson et al. (2017a); Hu et al. (2017) and consider program generation as a sequence-to-sequence task. Different from prior approaches, our models are trained to fully generate the parameters of component modules in text. This approach is appropriate as reasoning programs in real data domains such as current video-grounded dialogues are usually shorter than those for synthetic data (Johnson et al., 2017a) and thus, program generation takes less computational cost. However, module parameters, i.e. entities and actions, contain much higher semantic variance than synthetic data, and our approach facilitates better transparency and interpretability. We adopt a simple template $\mathrm { \langle \langle p a r a m _ { 1 } \rangle \langle m o d u l e _ { 1 } \rangle \langle p a r a m _ { 2 } \rangle \langle m o d u l e _ { 2 } \rangle . }$ .” as the target sequence. The resulting target sequences for dialogue and video understanding programs are sequences $\mathcal { P } _ { \mathrm { d i a l } }$ and $\mathcal { P } _ { \mathrm { v i d } }$ respectively. + +Table 1: Description of the modules and their functionalities. We denote $P$ as the parameter to instantiate each module, $H$ as the dialogue history, $Q$ as the question of the current dialogue turn, and $V$ as video input. + +
ModuleInputOutputDescription
findP,HHentForrelated entities in question,select the relevant tokens from dialogue history
summarizeHent,QQctxBased on contextual entity representations,summarise the question semantics
whereP,VVentSelect the relevant spatial position corresponding to original (resolved) entities
whenP,VentVent+actSelect the relevant entity-aware temporal steps corresponding to the action parameter
describeP,Vent+actVctx VctxSelect visual entity-action features based on non-binary question types
existQ,Vent+actSelect visual entity-action features based on binary (yes/no) question types
+ +# 3.1 ENCODERS + +Text Encoder. A text encoder is shared to encode text inputs, including dialogue history, questions, and captions. The text encoder converts each text sequence $\mathcal { X } = w _ { 1 } , . . . , w _ { m }$ into a sequence of embeddings $\boldsymbol { X } \in \mathbb { R } ^ { m \times d }$ . We use a trainable embedding matrix to map token indices to vector representations of $d$ dimensions through a mapping function $\phi$ . These vectors are then integrated with ordering information of tokens through a positional encoding function with layer normalization (Ba et al., 2016; Vaswani et al., 2017). The embedding and positional representations are combined through element-wise summation. The encoded dialogue history and question of the current turn are defined as $H = \operatorname { N o r m } ( \phi ( \mathcal { H } ) + \operatorname { P E } ( \mathcal { H } ) ) \in \mathbb { R } ^ { L _ { \mathrm { H } } \times d }$ and $Q = \dot { \mathrm { N o r m } } ( \dot { \phi ( \mathcal { Q } ) } + \mathrm { P E } ( \mathcal { Q } ) ) \in \mathbb { R } ^ { L _ { \mathrm { Q } } \times d }$ . + +To decode program and response sequences auto-repressively, a special token “_sos” is concatenated as the first token $w _ { 0 }$ . The decoded token $w _ { 1 }$ is then appended to $w _ { 0 }$ as input to decode $w _ { 2 }$ and so on. Similarly to input source sequences, at decoding time step $j$ , the input target sequence is encoded to obtain representations for dialogue understanding program $P _ { \mathrm { d i a l } } | _ { 0 } ^ { j - 1 }$ , video understanding program $P _ { \mathrm { v i d } } | _ { 0 } ^ { j - 1 }$ , and system response $R | _ { 0 } ^ { j - 1 }$ . We combine vocabulary of input and output sequences and share the embedding matrix $E \in \mathbb { R } ^ { | \mathbb { V } | \times d }$ where $\mathbb { V } = \mathbb { V } ^ { i n } \cap \mathbb { V } ^ { o u t }$ . + +Video Encoder. To encode video input, we use pre-trained models to extract visual features and audio features. We denote $F$ as the sampled video frames or video clips. For object-level visual features, we denote $O$ as the maximum number of objects considered in each frame. The resulting output from a pretrained object detection model is $Z _ { \mathrm { o b j } } \in \mathbb { R } ^ { F \times O \times d _ { \mathrm { v i s } } }$ . We concatenate each object representation with the corresponding coordinates projected to $d _ { \mathrm { v i s } }$ dimensions. We also make use of a CNN-based pre-trained model to obtain features of temporal dimension $Z _ { \mathrm { c n n } } \in \mathbb { R } ^ { F \times d _ { \mathrm { v i s } } }$ . The audio feature is obtained through a pretrained audio model, $\boldsymbol { Z _ { \mathrm { a u d } } ^ { \star } } \in \mathbb { R } ^ { F \times d _ { \mathrm { a u d } } }$ . We passed all video features through a linear transformation layer with ReLU activation to the same embedding dimension $d$ . + +# 3.2 NEURAL MODULES + +We introduce neural modules that are used to assemble an executable program constructed by the generated sequence from question parsers. We provide an overview of neural modules in Table 1 and demonstrate dialogue understanding and video understanding modules in Figure 3 and 4 respectively. Each module parameter, e.g. “a backpack”, is extracted from the parsed program. For each parameter, we denote $P \in \mathbb { R } ^ { d }$ as the average pooling of component token embeddings. + +find $( \pmb { \mathbb { P } } , \pmb { \mathbb { H } } ) \to \pmb { \mathbb { H } } _ { \mathrm { e n t } }$ . This module handles entity tracing by obtaining a distribution over tokens in dialogue history. We use an entity-to-dialogue-history attention mechanism applied from an entity $P _ { i }$ to all tokens in dialogue history. Any neural network that learn to generate attention between two tensors is applicable .e.g. (Bahdanau et al., 2015; Vaswani et al., 2017). The attention matrix normalized by softmax, $A _ { \mathrm { f i n d , i } } \in \mathbb { R } ^ { L _ { \mathrm { H } } }$ , is used to compute the weighted sum of dialogue history token representations. The output is combined with entity embedding $P _ { i }$ to obtain contextual entity representation $H _ { \mathrm { e n t , i } } \in \mathbb { R } ^ { d }$ . + +summarize $( \mathbf { \delta H } _ { \mathrm { e n t } } , \mathbf { \delta Q } ) \to \mathbf { \delta Q } _ { \mathrm { c t x } }$ . For each contextual entity representation $H _ { \mathrm { e n t , i } }$ , $i = 1 , . . . , N _ { \mathrm { e n t } }$ , it is projected to $L _ { \mathrm { Q } }$ dimensions and is combined with question token embeddings through elementwise summation to obtain entity-aware question representation $Q _ { \mathrm { e n t , i } } \in \mathbb { R } ^ { L _ { \mathrm { Q } } \times d }$ . It is fed to a one-dimensional CNN with max pooling layer (Kim, 2014) to obtain a contextual entity-aware question representation. We denote the final output as $Q _ { \mathrm { c t x } } \in \mathbb { R } ^ { N _ { \mathrm { e n t } } \times d }$ . + +While previous models usually focus on global or token-level dependencies (Hori et al., 2019; Le et al., 2019b) to encode question features, our modules compress fine-grained question representations at entity level. Specifically, find and summarize modules can generate entity-dependent local and global representations of question semantics. We show that our modularized approach can achieve better performance and transparency than traditional approaches to encode dialogue context (Serban et al., 2016; Vaswani et al., 2017) (Section 4). + +![](images/f85b6a3de3efb5d106598bd63ca55e04399de8753853806ee05d04fae2725123.jpg) +Figure 3: find and summarize neural modules for dialogue understanding + +where $( \pmb { \mathrm { p } } , \pmb { \mathrm { v } } ) \pmb { \mathrm { v } } _ { \mathrm { e n t } }$ . Similar to the find module, this module handle entity-based attention to the video input. However, the entity representation $P$ in this case is parameterized by the original entity in dialogue rather than in question (See Section 3.3 for more description). Each entity $P _ { i }$ is stacked to match the number of sampled video frames/clips $F$ . An attention network is used to obtain entity-to-object attention matrix $A _ { \mathrm { w h e r e , i } } ^ { \bullet } \in \mathbb { R } ^ { F \times O }$ . The attended feature are compressed through weighted sum pooling along the spatial dimension, resulting in $V _ { \mathrm { e n t , i } } \in \mathbb { R } ^ { F \times d }$ , $i = 1 , . . . , N _ { \mathrm { e n t } }$ . + +when $( \mathbb { P } , \pmb { \nabla } _ { \mathrm { e n t } } ) \pmb { \nabla } _ { \mathrm { e n t + a c t } }$ . This module follows a similar architecture as the where module. However, the action parameter $P _ { i }$ is stacked to match $N _ { \mathrm { e n t } }$ dimensions. The attention matrix $A _ { \mathrm { w h e n , i } } \in \mathbb { R } ^ { F }$ is then used to compute the visual entity-action representations through weighted sum along the temporal dimension. We denote the output for all actions $P _ { i }$ as $V _ { \mathrm { e n t + a c t } } \in \mathbb { R } ^ { N _ { \mathrm { e n t } } \times N _ { \mathrm { a c t } } \times d }$ describe $( \mathbb { P } , \nabla _ { \mathrm { e n t + a c t } } ) \to \mathbf { \nabla } \mathbf { V } _ { \mathrm { c t x } }$ . This module is a linear transformation to compute $V _ { \mathrm { c t x } } ~ =$ ${ W _ { \mathrm { d e s c } } } ^ { T } [ V _ { \mathrm { e n t + a c t } } ; P _ { \mathrm { s t a c k } } ] \in \mathbb { R } ^ { N _ { \mathrm { e n t } } \times N _ { \mathrm { a c t } } \times d }$ where $W _ { \mathrm { d e s c } } \in \mathrm { R } ^ { 2 d \times d }$ , $P _ { \mathrm { s t a c k } }$ is the stacked representations of parameter embedding $P$ to $N _ { \mathrm { e n t } } \times N _ { \mathrm { a c t } }$ dimensions, and $[ ; ]$ is the concatenation operation. + +The exist module is a special case of describe module where the parameter $P$ is the average pooled question embeddings. The above where module is applied to object-level features. For temporal-based features such as CNN-based and audio features, the same neural operation is applied along the temporal dimension. Each resulting entity-aware output is then incorporated to frame-level features through element-wise summation (Please refer to Appendix A.1). + +![](images/fccd4959bc59d2dd1c8e856c9749101d47a87e9632762e7aba9a6f87cfbf6d66.jpg) +Figure 4: where and when neural modules for video understanding + +An advantage of our architecture is that it separates dialogue and video understanding. We adopt a transparent approach to solve linguistic entity references during the dialogue understanding phase. The resolved entities are fed to the video understanding phase to learn entity-action dynamics in video. We show that our approach is robust when dialogue evolves to many turns and video extends over time (Please see Section 4 and Appendix C). + +# 3.3 DECODERS + +Question parsers. The parsers decompose questions into sub-sequences to construct compositional reasoning programs for dialogue and video understanding. Each parser is an attention-based Transformer decoder. Given the encoded question $Q$ , to decode program for dialogue understanding, the contextual signals are integrated through 2 attention layers: one attention on previously generated tokens, and the other on question tokens. + +To generate programs for video understanding, the contextual signals are learned and incorporated in a similar manner. However, to exploit dialogue contextual cues, the execution output of dialogue understanding neural modules $Q _ { \mathrm { c t x } }$ (See Section 3.2) is incorporated to each vector in $P _ { \mathrm { v i d } }$ through an additional attention layer. This layer integrates the entity-dependent contextual representations from $Q _ { \mathrm { c t x } }$ to explicitly decode the original entities for video understanding programs. + +Response Decoder. System response is decoded by incorporating the dialogue context and video context outputs from the corresponding reasoning programs to target token representations. We follows a vanilla Transformer decoder architecture (Le et al., 2019b), which consists of 3 attention layers: self-attention to attend on existing tokens, attention to $Q _ { \mathrm { c t x } }$ from dialogue understanding program execution, and attention to $V _ { \mathrm { c t x } }$ from video understanding program execution. + +Optimization. We use the standard cross-entropy losses for prediction of dialogue and video understanding programs and output responses. We optimize models by joint training to minimize: $\begin{array} { r } { \mathcal { L } = \alpha \mathcal { L } _ { \mathrm { d i a l } } + \beta \mathcal { L } _ { \mathrm { v i d } } + \mathcal { L } _ { \mathrm { r e s } } = \alpha \sum _ { j } - \log ( \mathbf { P } _ { \mathrm { d i a l } } ( \mathcal { P } _ { \mathrm { d i a l } , \mathbf { j } } ) ) + \beta \sum _ { l } - \log ( \mathbf { P } _ { \mathrm { v i d e o } } ( \mathcal { P } _ { \mathrm { v i d e o } , 1 } ) ) + \sum _ { n } - \log ( \mathbf { P } _ { \mathrm { r e s } } ( \mathcal { R } _ { \mathrm { n } } ) ) } \end{array}$ where $\mathbf { P }$ is the probability distribution of an output token. The probability is computed by passing output representations from the parsers and decoder to a linear layer $\dot { W } \in \mathbb { R } ^ { d \times V }$ with softmax activation. We share the parameters between $W$ and embedding matrix $E$ . The hyper-parameters $\alpha \geq 0$ and $\beta \geq$ are fine-tuned during training. + +# 4 EXPERIMENTS + +Datasets. We use the AVSD benchmark from the $7 ^ { t h }$ Dialogue System Technology Challenge (DSTC7) (Hori et al., 2019). In the experiments with AVSD, we consider two settings: one with video summary and one without video summary as input. In the setting with video summary, the summary is concatenated to the dialogue history before the first dialogue turn. We also adapt VilNMN to the video QA benchmark TGIF-QA (Jang et al., 2017). Different from AVSD, TGIF-QA contains a diverse set of tasks, which address different visual aspects in video. + +Training Procedure. We follow prior approaches (Hu et al., 2017; 2018; Kottur et al., 2018) by obtaining the annotations of the programs through a language parser (Hu et al., 2016) and a reference resolution model (Clark & Manning, 2016). During training, we directly use these soft labels of programs and the given ground-truth responses to train the models. The labels are augmented with label smoothing technique (Szegedy et al., 2016). During inference time, we generate all programs and responses from given dialogues and videos. We run beam search to enumerate programs for dialogue and video understanding and dialogue responses. (Please see Appendix B for more details). + +AVSD Results. We evaluate model performance by the objective metrics based on word overlapping, including BLEU (Papineni et al., 2002), METEOR (Banerjee & Lavie, 2005), ROUGE-L (Lin, 2004), and CIDEr (Vedantam et al., 2015), between each generated response and 6 reference gold responses. As seen in Table 2, our models outperform most of existing approaches. In particular, the performance of our model in the setting without video summary input is comparable to the GPT-based RLM (Li et al., 2020) with much smaller model size. The Student-Teacher baseline (Hori et al., 2019) specifically focuses on the performance gap between models with and without textual signals from video summary through a dual network of expert and student models. Instead, VilNMN reduces this performance gap through efficiently extracting relevant visual/audio information based on fine-grained entity and action signals. We also found that VilNMN applied on object-level features is competitive to the model applied on CNN-based features. The flexibility of VilNMN neural programs can also be seen in the experiment when the video understanding program is applied on the caption input as a visual feature. + +Ablation Analysis. We experiment with several variants of VilMNM (either NMN or non-NMNbased) in the setting with CNN based features and video summary input As can be seen in Table 3, our approach to video and dialogue understanding through compositional reasoning programs exhibits better performance than non-compositional approaches. Compared to the approaches that directly process frame-level features in videos (Row B) or token-level features in dialogues (Row C, D), our full VilNMN (Row A) considers entity-level and action-level information extraction and thus, avoids unnecessary and possibly noisy extraction. Compared to the approaches that obtain dialogue contextual cues through a hierarchical encoding architecture (Row E, F) such as (Serban et al., 2016; Hori et al., 2019), VilNMN directly addresses the challenge of entity references in dialogues. As mentioned, we hypothesize that the hierarchical encoding architecture is more appropriate for less entity-sensitive dialogues such as chit-chat and open-domain dialogues. Please see Appendix C for additional analysis of performance breakdown by dialogue turns and video lengths. + +Table 2: AVSD test results: The visual features are: I (I3D), ResNeXt-101 (RX), Faster-RCNN (FR), C (caption as a video input). The audio features are: VGGish (V), AclNet (A). Xon PT denotes models using pretrained weights and/or additional finetuning. Best and second best results are bold and underlined respectively. + +
ModelPTVisualAudioBLEU4METEORROUGE-LCIDEr
Audio/Visual only (without Video Summary/Caption)
Baseline (Hori et al.,2019)I■0.3050.2170.4810.733
Baseline (Hori et al.,2019)IV0.3090.2150.4870.746
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3150.2390.5090.848
FGA (Schwartz et al.,2019)IV0.806
JMAN (Chu et al., 2020)I-0.3090.2400.5200.890
Student-Teacher (Hori et al.,2019)IV0.3710.2480.5270.966
MTN (Le et al.,2019b)I-0.3430.2470.5200.936
MTN (Le et al., 2019b)IV0.3680.2590.5370.964
MSTN (Lee et al.,2020)IV0.3790.2610.5481.028
RLM-GPT2 (Li et al., 2020)√IV0.4020.2540.5441.052
VilNMN=I-0.3970.2620.5501.059
VilNMNFR■0.3880.2590.5491.040
VilNMN-V0.3810.2520.5341.004
VilNMNIV0.3960.2630.5491.059
Audio/Visual only (with Video Summary/Caption)
TopicEmb (Kumar et al.,2019)IA0.3290.2230.4880.762
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3100.2420.5150.856
JMAN (Chu et al., 2020)I-0.3340.2390.5330.941
FA+HRED (Nguyen et al., 2018)=IV0.3600.2490.5440.997
VideoSum (Sanabria etal.,2019)=RX-0.3940.2670.5631.094
VideoSum+How2 (Sanabria et al.,2019)√RX-0.3870.2660.5641.087
MSTN (Lee et al.,2020)IV0.3770.2750.5661.115
Student-Teacher (Hori et al.,2019)IV0.4050.2730.5661.118
MTN (Le et al.,2019b)I-0.3920.2690.5591.066
MTN (Le et al.,2019b)IV0.4100.2740.5691.129
VGD-GPT2 (Le & Hoi,2020)√IV0.4360.2820.5791.194
RLM-GPT2 (Li et al., 2020)√IV0.4590.2940.6061.308
VilNMN■I10.4210.2770.5741.171
VilNMNFR-0.4210.2750.5711.148
VilNMNIV0.4210.2770.5731.167
VilNMNI+CV0.4290.2780.5781.188
+ +Table 3: Ablation analysis of VilNMN with different model variants on the test split of the AVSD benchmark + +
#ModelVariantBLEU4CIDEr
AFullVilNMN0.4211.171
BNo video NMNs; + vanilla text-→video attention0.4151.159
C→No dial.NMNs;+ response-→history attention0.4121.151
D→No dial.NMNs;+ response-→concat(history+question) attention0.4111.133
ENo dial.NMNs;+ HREDLsTM(history) + question attn.0.4141.153
F→No dial.NMNs; + HREDGRU(history) + question attn.0.4151.138
+ +Intepretability. A difference of VilNMN from previous approaches to video-grounded dialogues is the model interpretability based on the predicted dialogue and video programs. From Figure 5, we observe that in cases where predicted dialogue programs and video program match or are close to the gold labels, the model can generate generally correct responses. In cases of wrong predicted responses, we can further look at how the model understands the questions based on predicted programs. In the $3 ^ { r d }$ turn of example 1, the output response is missing a minor detail as compared to the label response because the video program fails to capture the parameter “rooftop”. These subtle yet important details can determine whether output responses can fully address user queries. Similarly, in example 2, the model answers the question “what room” instead of question about “an object”. For additional qualitative analysis, please see Appendix D. + +TGIF-QA Results. In TGIF-QA experiments, we report the result using the L2 loss in Count task and accuracy in other tasks. From Table 4, VilNMN outperforms all baseline models in all tasks by a large margin. Compared to AVSD experiments, the TGIF-QA experiments emphasize video understanding ability of the models, removing the requirement for dialogue understanding and natural language generation. This is demonstrated through higher performance gaps between VilNMN with generated programs and soft label programs as compared to ones in AVSD experiments. We also observe that an attention layer attending to question is important during the response decoding phase in TGIF-QA as there is no dialogue context $Q _ { \mathrm { c t x } }$ in Video QA tasks. + +![](images/b76cdb81c535fa60c73e2ed0fbce53a5355fe5d0af1cb511403543cd18aa93a9.jpg) + +
TurnQuestionDialogue NMNVideo NMNResponse
3...what are theydoing in the scene ?are they on arooftop?Predicted:find(they),find(the scene)→summarize()×Gold: find(they)→summarize()Predicted: where(two men in thevideo),where(the scene)→when(doing inthe scene)→describe(what)Gold:where(two men),where (rooftop)→when(doing in the scene)-describe(what)Predicted: one is washinga chair and the other istaking picturesXGold: yes,on a secondfloor roof deck ,one man iswashing a chair,anotherman is either filming ortaking pictures
4does he sit in thechair after washingit?Predicted:find (he),find(the chair)→summarize()Gold: find(he),find(the chair)→summarize()Predicted: where(one man in the video),where(a chair)→ when(sit in the chairafter washing it)-exist()Gold:where(one man),where(a chair)→when(sit in the chair after washingit)-exist()Predicted: no, he does notsit in the chair√Gold: no he does not,thereis a pipe with water runningall over
+ +![](images/b2ce15a7da399a54da904703872d8a7d046bcc27067064f947a84577c92b87c0.jpg) + +![](images/181282280ef506314f5ed0b0226febd77d1a2bd127b0b5c7121f865b44526cc7.jpg) + +Figure 5: Intepretability of model outputs from a dialogue in the test split of the AVSD benchmark. +Table 4: Experiment results on the TGIF-QA benchmark. The visual features are: ResNet-152 (R), C3D (C), Flow CNN from two-stream model (F), VGG (V), ResNeXt-101 (RX). + +
ModelVisualCount (Loss)Action (Acc)Transition (Acc)FrameQA (Acc)
VIS(avg) (Ren et al.,2015a)R4.800.4880.3480.350
MCB (aggr) (Fukui et al.,2016)R5.170.5890.2430.257
Yu et al. (Yu et al., 2017)R5.130.5610.6400.396
ST-VQA (t) (Gao et al., 2018)R+F4.320.6290.6940.495
Co-Mem (Gao et al.,2018)R+F4.100.6820.7430.515
PSAC (Li et al.,2019)R4.270.7040.7690.557
HME (Fan et al.,2019)R+C4.020.7390.7780.538
STA (Gao et al.,2019)R4.250.7230.7900.566
CRN+MAC (Le et al.,2019c)R4.230.7130.7870.592
MQL (Lei et al., 2020)V---0.598
QueST (Jiang et al.,2020)R4.190.7590.8100.597
HGA (Jiang & Han,2020)R+C4.090.7540.8100.551
GCN (Huang et al., 2020)R+C3.950.7430.8110.563
HCRN (Le et al.,2020)R+RX3.820.7500.8140.559
VilNMNR2.650.8450.8870.747
→soft label programsR1.900.8570.8980.780
→- res-to-question attn.R3.280.8010.7760.679
+ +# 5 CONCLUSION + +While conventional neural network approaches have achieved notable successes in video-grounded dialogues and video QA, they often rely on superficial pattern learning principles between contextual cues from questions/dialogues and videos. In this work, we introduce Visio-Linguistic Neural Module Network (VilNMN). VilNMN consists of dialogue and video understanding neural modules, each of which performs entity and action-level operations on language and video components. Our comprehensive experiments on AVSD and TGIF-QA benchmarks show that our models can achieve competitive performance while promoting a compositional and interpretable learning approach. + +# REFERENCES + +Aishwarya Agrawal, Dhruv Batra, and Devi Parikh. Analyzing the behavior of visual question answering models. In Proceedings of the 2016 Conference on Empirical Methods in Natural Language Processing, pp. 1955–1960, Austin, Texas, November 2016. 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URL https: //www.aclweb.org/anthology/P19-1282. + +Gunnar A Sigurdsson, Gül Varol, Xiaolong Wang, Ali Farhadi, Ivan Laptev, and Abhinav Gupta. Hollywood in homes: Crowdsourcing data collection for activity understanding. In European Conference on Computer Vision, pp. 510–526. Springer, 2016. + +Nitish Srivastava, Geoffrey Hinton, Alex Krizhevsky, Ilya Sutskever, and Ruslan Salakhutdinov. Dropout: a simple way to prevent neural networks from overfitting. The Journal of Machine Learning Research, 15(1):1929–1958, 2014. + +Christian Szegedy, Vincent Vanhoucke, Sergey Ioffe, Jon Shlens, and Zbigniew Wojna. Rethinking the inception architecture for computer vision. In Proceedings of the IEEE conference on computer vision and pattern recognition, pp. 2818–2826, 2016. + +Ashish Vaswani, Noam Shazeer, Niki Parmar, Jakob Uszkoreit, Llion Jones, Aidan N Gomez, Ł ukasz Kaiser, and Illia Polosukhin. Attention is all you need. In I. Guyon, U. V. Luxburg, S. Bengio, H. Wallach, R. Fergus, S. Vishwanathan, and R. Garnett (eds.), Advances in Neural Information Processing Systems 30, pp. 5998–6008. Curran Associates, Inc., 2017. URL http: //papers.nips.cc/paper/7181-attention-is-all-you-need.pdf. + +Ramakrishna Vedantam, C Lawrence Zitnick, and Devi Parikh. Cider: Consensus-based image description evaluation. In Proceedings of the IEEE conference on computer vision and pattern recognition, pp. 4566–4575, 2015. + +Youngjae Yu, Hyungjin Ko, Jongwook Choi, and Gunhee Kim. End-to-end concept word detection for video captioning, retrieval, and question answering. In Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, pp. 3165–3173, 2017. + +# A ADDITIONAL MODEL DETAILS + +# A.1 NEURAL MODULES ON TEMPORAL FEATURES + +To adapt our neural modules to temporal features, we apply the same neural architectures in all modules except for the where module. In object-level features, this module operates on object-based or spatial-based level. We can apply this module to temporal-based features similarly simply by not stacking the parameter and pooling the attended features along the temporal dimension. For an entity parameter $P _ { i }$ , the attention matrix in this case is an entity-to-temporal-step matrix $A _ { \mathrm { w h e r e , i } } \in \mathbb { R } ^ { \tilde { F } }$ and the resulting pooled feature is $V _ { \mathrm { e n t , i } } \in \mathbb { R } ^ { d }$ . Before feeding this representation to a when module, we incorporate each $V _ { \mathrm { e n t , i } }$ into feature of each temporal step through an MLP layer and element-wise summation, resulting in overview of the where $V _ { \mathrm { e n t , i } } ^ { s t a c k } \in \mathbb { R } ^ { \mathrm { F } \times d }$ where poral $F$ is the number of sampled video frames/clips. Antures can be seen in Figure 6. + +![](images/00f0a2cc042a838be019c96ec5a63325ec1007abd58e16de83f1037dc0c8f8c8.jpg) +Figure 6: Adaptation of the where module to temporal-based features + +We adapt this module in a similar manner to other temporal-level features such as audio and textual features such as video caption. We keep the same architecture in the when module. We denote the resulting output from the when module for all actions $P _ { i }$ is $V _ { \mathrm { a c t } } \in \mathbb { R } ^ { N _ { \mathrm { a c t } } \times d }$ . We concatenate this to the output from the previous where module $V _ { \mathrm { e n t } }$ to obtain $V _ { \mathrm { e n t + a c t } } \in \mathbb { R } ^ { ( N _ { \mathrm { e n t } } + N _ { \mathrm { a c t } } ) \times d }$ . This is used as input to the describe or exist module. + +# A.2 QUESTION PARSER + +The parsers decompose questions into sub-sequences to construct compositional reasoning programs for dialogue and video understanding. Each parser is an attention-based Transformer decoder. The Transformer attention is a multi-head attention on query, key, and value tensors, denoted as Attention(Query, Key, Value). For each token in the Query sequence , the distribution over tokens in the Key sequence is used to obtain the weighted sum of the corresponding representations in the Value sequence. + +$$ +{ \mathrm { A t t e n t i o n } } ( Q u e r y , K e y , V a l u e ) = { \mathrm { s o f t m a x } } ( { \frac { Q u e r y K e y ^ { T } } { \sqrt { d _ { k e y } } } } ) V a l u e \in \mathbb { R } ^ { L _ { \mathrm { q u e r y } } \times d _ { \mathrm { q u e r y } } } +$$ + +Each attention is followed by a feed-forward network applied on each position identically. We exploit the multi-head and feed-forward architecture, which show good performance in NLP tasks such as NMT and QA (Vaswani et al., 2017; Dehghani et al., 2019), to efficiently incorporate contextual cues from dialogue components to parse question into reasoning programs. Given the encoded question $Q$ , to decode program for dialogue understanding, the contextual signals are integrated through 2 attention layers: one attention on previously generated tokens, and the other on question tokens. At time step $j$ , we denote the output from an attention layer as $A _ { \mathrm { d i a l , j } }$ . + +$$ +\begin{array} { r l } & { A _ { \mathrm { d i a l } } ^ { ( 1 ) } = \mathrm { A t t e n t i o n } ( P _ { \mathrm { d i a l } } | _ { 0 } ^ { j - 1 } , P _ { \mathrm { d i a l } } | _ { 0 } ^ { j - 1 } , P _ { \mathrm { d i a l } } | _ { 0 } ^ { j - 1 } ) \in \mathbb { R } ^ { j \times d } } \\ & { A _ { \mathrm { d i a l } } ^ { ( 2 ) } = \mathrm { A t t e n t i o n } ( A _ { \mathrm { d i a l } } ^ { ( 1 ) } , Q , Q ) \in \mathbb { R } ^ { j \times d } } \end{array} +$$ + +Similarly, to generate programs for video understanding, the contextual signals are learned and incorporated in a similar manner. However, to exploit dialogue contextual cues, the execution output of dialogue understanding neural modules $Q _ { \mathrm { c t x } }$ is incorporated to each vector in $P _ { \mathrm { d i a l } }$ through an additional attention layer. This layer integrates the resolved entity information to decode the original entities for video understanding. It is equivalent to a reasoning process that converts the question from its original multi-turn semantics to single-turn semantics. + +$$ +{ \cal A } _ { \mathrm { v i d } } ^ { ( 3 ) } = \mathrm { A t t e n t i o n } ( A _ { \mathrm { v i d } } ^ { ( 2 ) } , Q _ { \mathrm { c t x } } , Q _ { \mathrm { c t x } } ) \in \mathbb { R } ^ { j \times d } +$$ + +# A.3 NON-NMN MODELS + +For ablation analysis, we evaluate several variants of VilNMN, based on the following categories: + +To test the contribution of our NMN approach for video understanding, we remove the parser for video understanding program and related neural modules and replace them with pure neural network architecture (Model $B$ ). Specifically, we remove neural modules where, when, describe, and exist. We then directly use video feature embeddings $V$ as $V _ { \mathrm { c t x } }$ as input to the original attention layer in response decoder similarly to (Hori et al., 2019; Sanabria et al., 2019). + +$$ +A _ { \mathrm { r e s } } ^ { ( 3 ) } = \mathrm { A t t e n t i o n } ( A _ { \mathrm { r e s } } ^ { ( 2 ) } , V , V ) \in \mathbb { R } ^ { j \times d } +$$ + +To further test the contribution of NMN architecture for dialogue understanding, we similarly remove the question parser for dialogue understanding program and neural modules find and describe. We then directly use the dialogue history embeddings $H$ and question embeddings $Q$ as inputs to the response decoder in two different ways. First, we replace the original attention on dialogue context $Q _ { \mathrm { c t x } }$ with two attention layers to attend on dialogue history and question sequentially (Model $C$ ). As noted by Le et al. (2019b), question input contains much more relevant signals than dialogue history and attention operation should be separated from the one on dialogue history. + +$$ +\begin{array} { r } { A _ { \mathrm { r e s } } ^ { ( 2 a ) } = \mathrm { A t t e n t i o n } ( A _ { \mathrm { r e s } } ^ { ( 1 ) } , H , H ) \in \mathbb { R } ^ { j \times d } } \\ { A _ { \mathrm { r e s } } ^ { ( 2 b ) } = \mathrm { A t t e n t i o n } ( A _ { \mathrm { r e s } } ^ { ( 2 a ) } , Q , Q ) \in \mathbb { R } ^ { j \times d } } \end{array} +$$ + +Alternatively, we simply concatenate dialogue and question embeddings similarly to (Hori et al., 2019; Sanabria et al., 2019) and use it as input to the original attention layer (Model $D$ ). + +$$ +A _ { \mathrm { r e s } } ^ { ( 2 ) } = \mathrm { A t t e n t i o n } ( A _ { \mathrm { r e s } } ^ { ( 1 ) } , [ H ; Q ] , [ H ; Q ] ) \in \mathbb { R } ^ { j \times d } +$$ + +To use more sophisticated neural models for dialogue understanding, we further adopt the hierarchical encoding architecture with question attention (Li et al., 2016; Serban et al., 2016; Hori et al., 2019). Each dialogue turn $\mathcal { H } _ { t }$ , including a pair of human utterance and system response, is processed separately by a word-level RNN such as LSTM (Model $E$ ) or GRU (Model $F$ ). A sentence-level RNN is used to sequentially process the last hidden states obtained previously turn by turn. The output in each recurrent step is fed to an attention layer such as (Bahdanau et al., 2015; Vaswani et al., 2017) to obtain question-aware representations of dialogue history. + +$$ +\begin{array} { r l } & { H _ { t } ^ { \mathrm { w o r d } } = \mathrm { R N N } ( H _ { t } ) \in \mathbb { R } ^ { d } } \\ & { H _ { t } ^ { \mathrm { s e n t } } = \mathrm { R N N } ( H _ { t } ^ { \mathrm { w o r d } } ) \in \mathbb { R } ^ { d } } \\ & { \qquad H = [ H _ { t } ^ { \mathrm { s e n t } } ] | _ { t = 1 } ^ { T - 1 } \in \mathbb { R } ^ { d \times ( T - 1 ) } } \\ & { Q _ { \mathrm { c t x } } = \mathrm { A t t e n t i o n } ( Q , H , H ) \in \mathbb { R } ^ { L _ { Q } \times d } } \end{array} +$$ + +where $T$ is the current dialogue turn. The output is treated as $Q _ { \mathrm { c t x } }$ and is fed to the corresponding attention layer in the response decoder. + +# B ADDITIONAL EXPERIMENT DETAILS + +# B.1 DATASETS + +We use the AVSD benchmark from DSTC7 (Hori et al., 2019) which consists of dialogues grounded on the Charades videos (Sigurdsson et al., 2016). Each dialogue contains up to 10 dialogue turns, each turn consists of a question and expected response about a given video. For visual features, we use the 3D CNN based features from a pretrained I3D model (Carreira & Zisserman, 2017) and object-level features from a pretrained FasterRNN model (Ren et al., 2015b). The audio features are obtained from a pretrained VGGish model (Hershey et al., 2017). In the experiments with AVSD, we consider two settings: one with video summary and one without video summary as input. In the setting with video summary, the summary is concatenated to the dialogue history before the first dialogue turn. We also adapt VilNMN to the video QA benchmark TGIF-QA (Jang et al., 2017). Different from AVSD, TGIF-QA contains a diverse set of QA tasks: + +• Count: open-ended task which counts the number of repetitions of an action • Action: multiple-choice (MC) task which asks about a certain action occurring for a fixed number of times • Transition: MC task which emphasizes temporal transition in video • Frame: open-ended task which can be answered from visual contents of one of video frames + +For the TGIF-QA benchmark, we use the extracted features from a pretrained ResNet model (He et al., 2016). + +Table 5: Summary of DSTC7 AVSD and TGIF-QA benchmark + +
#TrainVal.Test
AVSDDialogs7,6591,7871,710
Turns153,18035,74013,490
Words1,450,754339,006110,252
TGIFQACount QA24,1592,6843,554
Action QA18,4282,0472,274
Trans. QA47,4345,2706,232
Frame QA35,4533,93913,691
+ +# B.2 TRAINING DETAILS + +We use a training batch size of 32 and embedding dimension $d = 1 2 8$ in all experiments. Where Transformer attention is used, we fix the number of attention heads to 8 in all attention layers. In neural modules with MLP layers, the MLP network is fixed to 2 linear layers with a ReLU activation in between. In neural modules with CNN, we adopt a vanilla CNN architecture for text classification (without the last MLP layer) where the number of input channels is 1, the kernel sizes are $\{ 3 , 4 , 5 \}$ , and the number of output channels is $d$ . We initialize models with uniform distribution (Glorot & Bengio, 2010). During training, we adopt the Adam optimizer (Kingma & Ba, 2015) and a decaying learning rate Vaswani et al. (2017) where we fix the warm-up steps to 15K training steps. We employ dropout (Srivastava et al., 2014) of 0.2 at all networks except the last linear layers of question parsers and response decoder. We train models up to 50 epochs and select the best models based on the average loss per epoch in the validation set. + +# C ADDITIONAL RESULTS + +To evaluate model robustness, we report the relative performance by calculating the difference of CIDEr in experimental settings against the most basic setting. Specifically, we compare against performance of output responses in the first dialogue turn position (i.e. $2 ^ { n \dot { d } } – 1 0 ^ { t h }$ turn vs. the $1 ^ { s t }$ turn), or responses grounded on the shortest video length range (video ranges are intervals of $0 – 1 0 ^ { t h }$ , $1 0 \ – 2 0 ^ { t h }$ percentile and so on). We report the results of the model variants A, B, and E (See the Ablation Analysis section in the main paper and Appendix A.3 for model description). First, as can be seen in Figure 7, for various dialogue turn positions, we observe that the original VilNMN (model A) suffers less than model E when dialogues extend over time up the $8 ^ { t h }$ turn. This explains the contribution of dialogue understanding modules in solving entities even when the dialogues grow longer. Secondly, as compared to model B, we observe that the Full VilNMN (model A) is less affected as the videos grounding the dialogues grow longer. The difference is clear when the video length increases up to 33 seconds. + +We also report the absolute scores and compare model variants. In Table 6a, we compare model variants B and E. We observe that model B generally performs better than model E in overall, especially in higher turn positions, i.e. from the $4 ^ { t h }$ turn to $8 ^ { t h }$ turn. Interestingly, we note some mixed results in very low turn position, i.e. the $2 ^ { n d }$ and $3 ^ { r d }$ turn, and very high turn position, i.e. the $1 0 ^ { t h }$ turn. Potentially, in very high turn position, the neural based approach such as hierarchical RNN can better capture the global dependencies within dialogue context than the entity-based compositional NMN method. + +In Table 6b, we compare model variants A and B. We note that the performance gap between model A and B is quite distinct, with 7/10 cases of video ranges in which model A outperforms. However, similarly to our prior observations in experiments by dialogue turn, in lower ranges (i.e. 1-23 seconds) and higher ranges (37-75 seconds), model A performs not as well as model B. There are additional factors that we will need to examine further to explain the results, such as the complexity of the questions for these short and long-range videos. Potentially, our question parser for video understanding program needs more sophisticated composition method to retrieve information from these video ranges. + +![](images/398de27efc81f7e3642d1abc7c7b4de47175198fb1e45e3f27e2fc1e430a106c.jpg) +Figure 7: Performance of model variants A, B, and E, by dialogue turn position and video length. The performance is calculated relatively to performance of the most basic setting, i.e. responses of the first dialogue turn $\Delta \mathrm { C I D E r _ { t u r n \_ i } } = \mathrm { C I D E r _ { t u r n \_ i } } - \mathrm { C I D E r _ { t u r n \_ 1 } }$ , or responses grounding on the lowest video range (0 to 23 seconds) $\Delta \mathrm { C I D E r _ { r a n g e \mathrm { _ i } } } = \mathrm { C I D E r _ { r a n g e \mathrm { _ i } } } - \mathrm { C I D E r _ { 0 - 2 3 } }$ . + +Table 6: Performance breakdown in BLEU4 and CIDEr +(a) by dialogue turn between model variants B and E. + +
BLEU4CIDEr
turn positionModel BModel EModel BModel E
10.5790.5871.6231.650
20.4290.4301.1551.142
30.2750.2890.8670.846
40.3090.3050.8590.855
50.3550.3351.0881.023
60.3570.3291.0440.950
70.3420.3250.8960.847
80.3610.3321.0250.973
90.3830.4311.0431.182
100.3950.3710.9310.977
+ +(b) by video length range (in seconds) between model variants A and B. + +
BLEU4CIDEr
video range (seconds)Model AModel BModel AModel B
1-230.4320.4471.2981.355
23-280.4360.4331.2641.165
28-300.3980.3761.2031.164
30-30.60.4410.4181.2201.202
30.6-310.4130.4111.2501.166
31-31.60.4390.4511.2491.295
31.6-320.4300.4191.2171.192
32-330.4680.4451.3431.237
33-370.3880.3811.1491.124
37-750.3560.3650.9100.962
+ +# D QUALITATIVE ANALYSIS + +We extract the predicted programs and responses for some example dialogues in Figure 8, 9, 10, and 11 and report our observations: + +• We observe that when the predicted programs are correct, the output responses generally match the ground-truth (See the $1 ^ { s t }$ and $2 ^ { n d }$ turn in Figure 8, and the $1 ^ { s t }$ and $4 ^ { { \bar { t } } h }$ turn in Figure 10) or close to the ground-truth responses ( $1 ^ { s t }$ turn in Figure 9). +• When the output responses do not match the ground truth, we can understand the model mistakes by interpreting the predicted programs. For example, in the $3 ^ { r d }$ turn in Figure 8, the output response describes a room because the predicted video program focuses on the entity “what room” instead of the entity “an object” in the question. Another example is the $3 ^ { \dot { r } d }$ turn in Figure 10 where the entity “rooftop” is missing in the video program. These mismatches can deviate the information retrieved from the video during video program execution, leading to wrong output responses with wrong visual contents. +We also note that in some cases, one or both of the predicted programs are incorrect, but the predicted responses still match the ground-truth responses. This might be explained as the predicted module parameters are not exactly the same as the ground truth but they are close enough (e.g. $4 ^ { t h }$ turn in Figure 8). Sometimes, our model predicted programs that are more appropriate than the ground truth. For example, in the $2 ^ { { \bar { n } } d }$ turn in Figure 9, the program is added with a where module parameterized by the entity “the shopping bag” which was solved from the reference “them” mentioned in the question. +• We observe that for complex questions that involve more than one queries (e.g. the $3 ^ { r d }$ turn in Figure 10), it becomes more challenging to decode an appropriate video understanding program and generate responses that can address all queries. +• In Figure 11, we demonstrate some output examples of VilNMN and compare with two baselines: Baseline (Hori et al., 2019) and MTN (Le et al., 2019b). We noted that VilNMN can include important entities relevant to the current dialogue turn to construct output responses while other models might miss some entity details, e.g. “them/dishes” in example A and “the magazine” in example B. These small yet important details can determine the correctness of dialogue responses. + +![](images/5e39bc95a0ceb8e3fb3d5469b7dd1efdd1618424facc2e40e32d72bd986dd909.jpg) + +![](images/4418977275529630c424ae9a011e6eb6302163738aca0446dbfdcd78de7e81e8.jpg) + +![](images/5ae7eb0ce394e9a325452d0eab7ff74705e152d97186a68063a0e73b0f9fe07c.jpg) + +![](images/d13d1be16d3744b012c2f4f68213120b43ec9510bcc6defd08e26fb98b5bceec.jpg) + +![](images/bcaefdb7909d644203e7c3e16b22b646729f276040913b46cc890612139a86e9.jpg) + +Figure 10: Example output programs and responses from a dialogue in the test split of the AVSD benchmark. + +
TurnQuestionDialogue UnderstandingProgramVideo UnderstandingProgramResponse
1hi how many peopleare in the video fromstart to finish ?Predicted: summari ze()Gold: summarize ()Predicted: describe (how manypeople)Gold:describe (how manypeople)Predicted: there are twopeople in the video.Gold: hello,there aretwo men
2are they carrying ona conversationbetween themselves?Predicted:find(they)→summarize()Gold:find(they),find(themselves)→summarize()Predicted: where(two men in the←video)→when(carrying on aconversation betweenthemselves)-exist()Gold:where(two men)→ when(carrying a conversationbetween themselves)-exist()Predicted: yes,they arecarrying a conversation×Gold: no,backgroundnoise is birdsong andshuffling noises
3what are they doingin the scene ?arethey on a rooftop ?Predicted: find(they),find(the scene)→summarize() ×Gold: find(they)→summarize()Predicted:where(two men in thevideo),where(the scene)→when(doing in the scene)→describe(what) ×Gold: where(two men),where(rooftop)→when(doingin the scene)-describe(what)Predicted: one iswashing a chair and theother is taking pictures×Gold: yes,on a secondfloor roof deck ,oneman is washing a chair,another man is eitherfilming or taking pictures
4does he sit in thechair after washingit?Predicted: find(he),find(the chair)→summarize()Gold: find (he),find(the chair)→summarize()Predicted: where(one man in thevideo),where(a chair)→when(sit in the chair afterwashing it)→exist()Gold:where(one man),where(achair)→ when(sit in thechair after washing it)→exist()Predicted: no,he doesnot sit in the chairGold: no he does not,there is a pipe withwater running all over
+ +![](images/b020b5ccf752b45a137b3877cf43d0b9573cdb8ca1bd4a82fc366971a6c29af8.jpg) +Figure 11: Intepretability of example outputs from VilNMN and baselines models (Hori et al., 2019; Le et al., 2019b) \ No newline at end of file diff --git a/parse/train/SUyxNGzUsH/SUyxNGzUsH_content_list.json b/parse/train/SUyxNGzUsH/SUyxNGzUsH_content_list.json new file mode 100644 index 0000000000000000000000000000000000000000..4d2c1d20f1c6d7e5677f42a4102f8d622212a787 --- /dev/null +++ b/parse/train/SUyxNGzUsH/SUyxNGzUsH_content_list.json @@ -0,0 +1,2105 @@ +[ + { + "type": "text", + "text": "VILNMN: A NEURAL MODULE NETWORK APPROACHTO VIDEO-GROUNDED LANGUAGE TASKS", + "text_level": 1, + "bbox": [ + 174, + 98, + 823, + 146 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Anonymous authors Paper under double-blind review ", + "bbox": [ + 183, + 170, + 398, + 198 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "ABSTRACT ", + "text_level": 1, + "bbox": [ + 454, + 234, + 544, + 250 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Neural module networks (NMN) have achieved success in image-grounded tasks such as Visual Question Answering (VQA) on synthetic images. However, very limited work on NMN has been studied in the video-grounded language tasks. These tasks extend the complexity of traditional visual tasks with the additional visual temporal variance. Motivated by recent NMN approaches on image-grounded tasks, we introduce Visio-Linguistic Neural Module Network (VilNMN) to model the information retrieval process in video-grounded language tasks as a pipeline of neural modules. VilNMN first decomposes all language components to explicitly resolve any entity references and detect corresponding action-based inputs from the question. The detected entities and actions are used as parameters to instantiate neural module networks and extract visual cues from the video. Our experiments show that VilNMN can achieve promising performance on two video-grounded language tasks: video QA and video-grounded dialogues. ", + "bbox": [ + 233, + 270, + 766, + 450 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "1 INTRODUCTION ", + "text_level": 1, + "bbox": [ + 176, + 486, + 336, + 502 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Vision-language tasks have been studied to build intelligent systems that can perceive information from multiple modalities, such as images, videos, and text. Extended from imaged-grounded tasks, e.g. (Antol et al., 2015), recently Jang et al. (2017); Lei et al. (2018) propose to use video as the grounding features. This modification poses a significant challenge to previous image-based models with the additional temporal variance through video frames. Recently Alamri et al. (2019) further develop video-grounded language research into the dialogue domain. In the proposed task, videogrounded dialogues, the dialogue agent is required to answer questions about a video over multiple dialogue turns. Using Figure 1 as an example, to answer questions correctly, a dialogue agent has to resolve references in dialogue context, e.g. “he” and “it”, and identify the original entity, e.g. “a boy\" and “a backpack\". In addition, the dialogue agent also needs to identify the actions of these entities, e.g. “carrying a backpack” to retrieve information along the temporal dimension of the video. ", + "bbox": [ + 174, + 520, + 825, + 674 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Current state-of-the-art approaches to video-grounded language tasks, e.g. (Le et al., 2019b; Fan et al., 2019) have achieved remarkable performance through the use of deep neural networks to retrieve grounding video signals based on language inputs. However, these approaches often assume the reasoning structure, including resolving references of entities and detecting the corresponding actions to retrieve visual cues, is implicitly learned. An explicit reasoning structure becomes more beneficial as the tasks complicates in two scenarios: video with complex spatial and temporal dynamics, and language inputs with sophisticated semantic dependencies, e.g. questions positioned in a dialogue context. In these cases, it becomes challenging to interpret model outputs, assess model reasoning capability, and identify errors in neural network models. ", + "bbox": [ + 174, + 680, + 825, + 805 + ], + "page_idx": 0 + }, + { + "type": "text", + "text": "Similar challenges have been observed in image-grounded tasks in which deep neural networks often exhibit shallow understanding capability as they simply exploit superficial visual cues (Agrawal et al., 2016; Goyal et al., 2017; Feng et al., 2018; Serrano & Smith, 2019). Andreas et al. (2016b) propose neural model networks (NMNs) by decomposing a question into sub-sequences called program and assembling a network of neural operations. Motivated by this line of research, we propose an NMN approach to video-grounded language tasks. Our approach benefits from integrating neural networks with a compositional reasoning structure to exploit low-level information signals in video. An example of the reasoning structure can be seen on the right side of Figure 1. ", + "bbox": [ + 174, + 811, + 825, + 924 + ], + "page_idx": 0 + }, + { + "type": "image", + "img_path": "images/08dfa3054943d0f06eb58bf4e0e2e48e82ee934f1926997c0219cf2c8c6783ea.jpg", + "image_caption": [ + "Figure 1: A sample video-grounded dialogue: Inputs are question, dialogue history, video with caption, visual and audio input, and the output is the answer to the question. On the right side, we demonstrate an example symbolic reasoning process a dialogue agent can perform to extract textual and visual clues for the answer. " + ], + "image_footnote": [], + "bbox": [ + 179, + 101, + 820, + 265 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "We propose Visio-Linguistic Neural Module Network (VilNMN) for video-grounded language tasks. VilNMN leverages entity-based dialogue representations as inputs to neural operations on spatial and temporal-level visual features. Previous approaches exploit question-level and token-level representations to extract question-dependent information from video (Jang et al., 2017; Fan et al., 2019; Le et al., 2019b). In complex videos with many entities or actions, these approaches might not be optimal to locate the right features. To exploit object-level features, VilNMN is trained to identify relevant entities first, and then to extract the temporal steps using detected actions of these entities. ", + "bbox": [ + 173, + 342, + 825, + 440 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "VilNMN is also trained to resolve any co-references in language inputs, e.g. questions in a dialogue context, to identify the original entities. Previous approaches to video-grounded dialogues often obtain question global representations in relation to dialogue context. These approaches might be suitable to represent general semantics in open-domain or chit-chat dialogues (Serban et al., 2016; Li et al., 2016) but they are not ideal to detect fine-grained entity-based information as the dialogue context evolves over time. ", + "bbox": [ + 174, + 446, + 825, + 530 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "In summary, we introduce a neural module network approach to video-grounded language tasks through a reasoning pipeline with entity and action representations applied on the spatio-temporal dynamics of video. To cater to complex semantic inputs in language inputs, e.g. dialogues, our approach also allows models to resolve entity references to incorporate question representations with fine-grained entity information. In our evaluation, we achieve competitive performance on the large-scale benchmark Audio-visual Scene-aware Dialogues (AVSD) (Alamri et al., 2019). We also adapt VilNMN for video QA and obtain the state-of-the-art on the TGIF-QA benchmark (Jang et al., 2017) across all tasks. Our experiments and ablation analysis indicate a potential direction to develop compositional and interpretable neural models for video-grounded language tasks. ", + "bbox": [ + 174, + 537, + 825, + 662 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "2 RELATED WORK ", + "text_level": 1, + "bbox": [ + 176, + 683, + 344, + 699 + ], + "page_idx": 1 + }, + { + "type": "text", + "text": "Video QA has been a proxy for evaluating a model’s understanding capability of language and video and the task is treated as a visual information retrieval task. Jang et al. (2017); Gao et al. (2018); Jiang et al. (2020) propose to learn attention guided by question global representation to retrieve spatial-level and temporal-level visual features. Li et al. (2019); Fan et al. (2019); Jiang & Han (2020) model interaction between all pairs of question token-level representations and temporal-level features of input video. Extended from video QA, video-grounded dialogue is an emerging task that combines dialogue response generation and video-language understanding research. Nguyen et al. (2018); Hori et al. (2019); Hori et al. (2019); Sanabria et al. (2019); Le et al. (2019a;b) extend traditional QA models by adding dialogue history neural encoders. Kumar et al. (2019) enhances dialogue features with topic-level representations to express the general topic in each dialogue. Sanabria et al. (2019) considers the task as a video summary task and concatenates question and dialogue history into a single sequence and proposes to transfer parameter weights from a large-scale video summary model. Different from prior work, we dissect the question sequence and explicitly detect and decode any entities and their references. Our models also benefit from the additional insights on how models learn to use component linguistic inputs for extraction of visual information. ", + "bbox": [ + 174, + 715, + 825, + 922 + ], + "page_idx": 1 + }, + { + "type": "image", + "img_path": "images/c1042d57aa0064953fc1ccfac4878bbe8349871223ee844ed91ddeaf1edb3ed5.jpg", + "image_caption": [ + "Figure 2: VilNMN includes 4 major components: (1) encoders that encode dialogue and video components into continuous vector representations; (2) question parsers that parse question of the current dialogue turn into compositional programs for dialogue and video understanding; (3) an inventory of neural modules that operate on dialogue and video input components; and (4) a response decoder that generates natural language sequence using dialogue-based and video-based execution outputs. " + ], + "image_footnote": [], + "bbox": [ + 174, + 101, + 825, + 247 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "Extending from the line of research on neural semantic parsing (Jia & Liang, 2016; Liang et al., 2017), Andreas et al. (2016b;a) introduce NMNs to address visual QA by decomposing questions into linguistic sub-structures, known as programs, to instantiate a network of neural modules. NMN models have achieved significant success in synthetic image domains where complex reasoning process is required (Johnson et al., 2017b; Hu et al., 2018; Han et al., 2019). Our work is related to the recent work that extends NMN models to real data domains. For instance, Kottur et al. (2018); Jiang & Bansal (2019); Gupta et al. (2020) extend NMNs to visual dialogues and reading comprehension tasks. In this paper, we introduce a new approach that exploits NMN to learn dependencies between the lexical composition in language inputs and the spatio-temporal dynamics in videos. This is not present in prior NMN models which are designed to apply on a two-dimensional image input without temporal variance. In video represented as sequence of images, each represented by object-level features, applying prior NMN models require aggregating frame-level features, e.g. through average pooling, resulting in potential loss of information. An alternative solution is a late-fusion method in which an NMN model performs reasoning structure programs on sampled video frames only. An object tracking mechanism or attention mechanism is then used to fuse the output representations. Instead, we propose to construct a reasoning structure with multi-step interaction between the space-time information in video with entity-action detected in text. ", + "bbox": [ + 173, + 363, + 826, + 601 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "3 METHOD ", + "text_level": 1, + "bbox": [ + 174, + 637, + 281, + 654 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "In this section, we present the design of our model, called Visio-Linguistic Neural Module Networks (VilNMN). An overview of the model can be seen in Figure 2. The input to the model consists of a dialogue $\\mathcal { D }$ which is grounded on a video $\\nu$ . The input components include the question of current dialogue turn $\\mathcal { Q }$ , dialogue history $\\mathcal { H }$ , and the features of input video, including visual and audio input. The output is a dialogue response, denoted as $\\mathcal { R }$ . Each text input component is a sequence of words $w _ { 1 } , . . . , \\bar { w } _ { m } \\in \\mathbb { V } ^ { i n }$ , the input vocabulary. Similarly, the output response $\\mathcal { R }$ is a sequence of tokens $w _ { 1 } , . . . , w _ { n } \\in \\mathbb { V } ^ { o u t }$ , the output vocabulary. ", + "bbox": [ + 173, + 680, + 825, + 777 + ], + "page_idx": 2 + }, + { + "type": "text", + "text": "To learn compositional programs, we follow Johnson et al. (2017a); Hu et al. (2017) and consider program generation as a sequence-to-sequence task. Different from prior approaches, our models are trained to fully generate the parameters of component modules in text. This approach is appropriate as reasoning programs in real data domains such as current video-grounded dialogues are usually shorter than those for synthetic data (Johnson et al., 2017a) and thus, program generation takes less computational cost. However, module parameters, i.e. entities and actions, contain much higher semantic variance than synthetic data, and our approach facilitates better transparency and interpretability. We adopt a simple template $\\mathrm { \\langle \\langle p a r a m _ { 1 } \\rangle \\langle m o d u l e _ { 1 } \\rangle \\langle p a r a m _ { 2 } \\rangle \\langle m o d u l e _ { 2 } \\rangle . }$ .” as the target sequence. The resulting target sequences for dialogue and video understanding programs are sequences $\\mathcal { P } _ { \\mathrm { d i a l } }$ and $\\mathcal { P } _ { \\mathrm { v i d } }$ respectively. ", + "bbox": [ + 174, + 785, + 825, + 924 + ], + "page_idx": 2 + }, + { + "type": "table", + "img_path": "images/91fd9fc66916815f9b1f48c7c6d18de05b45b6cb2c85d1011ed42bce2d5c0650.jpg", + "table_caption": [ + "Table 1: Description of the modules and their functionalities. We denote $P$ as the parameter to instantiate each module, $H$ as the dialogue history, $Q$ as the question of the current dialogue turn, and $V$ as video input. " + ], + "table_footnote": [], + "table_body": "
ModuleInputOutputDescription
findP,HHentForrelated entities in question,select the relevant tokens from dialogue history
summarizeHent,QQctxBased on contextual entity representations,summarise the question semantics
whereP,VVentSelect the relevant spatial position corresponding to original (resolved) entities
whenP,VentVent+actSelect the relevant entity-aware temporal steps corresponding to the action parameter
describeP,Vent+actVctx VctxSelect visual entity-action features based on non-binary question types
existQ,Vent+actSelect visual entity-action features based on binary (yes/no) question types
", + "bbox": [ + 176, + 137, + 820, + 215 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "3.1 ENCODERS ", + "text_level": 1, + "bbox": [ + 174, + 241, + 292, + 255 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Text Encoder. A text encoder is shared to encode text inputs, including dialogue history, questions, and captions. The text encoder converts each text sequence $\\mathcal { X } = w _ { 1 } , . . . , w _ { m }$ into a sequence of embeddings $\\boldsymbol { X } \\in \\mathbb { R } ^ { m \\times d }$ . We use a trainable embedding matrix to map token indices to vector representations of $d$ dimensions through a mapping function $\\phi$ . These vectors are then integrated with ordering information of tokens through a positional encoding function with layer normalization (Ba et al., 2016; Vaswani et al., 2017). The embedding and positional representations are combined through element-wise summation. The encoded dialogue history and question of the current turn are defined as $H = \\operatorname { N o r m } ( \\phi ( \\mathcal { H } ) + \\operatorname { P E } ( \\mathcal { H } ) ) \\in \\mathbb { R } ^ { L _ { \\mathrm { H } } \\times d }$ and $Q = \\dot { \\mathrm { N o r m } } ( \\dot { \\phi ( \\mathcal { Q } ) } + \\mathrm { P E } ( \\mathcal { Q } ) ) \\in \\mathbb { R } ^ { L _ { \\mathrm { Q } } \\times d }$ . ", + "bbox": [ + 173, + 266, + 825, + 378 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "To decode program and response sequences auto-repressively, a special token “_sos” is concatenated as the first token $w _ { 0 }$ . The decoded token $w _ { 1 }$ is then appended to $w _ { 0 }$ as input to decode $w _ { 2 }$ and so on. Similarly to input source sequences, at decoding time step $j$ , the input target sequence is encoded to obtain representations for dialogue understanding program $P _ { \\mathrm { d i a l } } | _ { 0 } ^ { j - 1 }$ , video understanding program $P _ { \\mathrm { v i d } } | _ { 0 } ^ { j - 1 }$ , and system response $R | _ { 0 } ^ { j - 1 }$ . We combine vocabulary of input and output sequences and share the embedding matrix $E \\in \\mathbb { R } ^ { | \\mathbb { V } | \\times d }$ where $\\mathbb { V } = \\mathbb { V } ^ { i n } \\cap \\mathbb { V } ^ { o u t }$ . ", + "bbox": [ + 174, + 385, + 825, + 474 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "Video Encoder. To encode video input, we use pre-trained models to extract visual features and audio features. We denote $F$ as the sampled video frames or video clips. For object-level visual features, we denote $O$ as the maximum number of objects considered in each frame. The resulting output from a pretrained object detection model is $Z _ { \\mathrm { o b j } } \\in \\mathbb { R } ^ { F \\times O \\times d _ { \\mathrm { v i s } } }$ . We concatenate each object representation with the corresponding coordinates projected to $d _ { \\mathrm { v i s } }$ dimensions. We also make use of a CNN-based pre-trained model to obtain features of temporal dimension $Z _ { \\mathrm { c n n } } \\in \\mathbb { R } ^ { F \\times d _ { \\mathrm { v i s } } }$ . The audio feature is obtained through a pretrained audio model, $\\boldsymbol { Z _ { \\mathrm { a u d } } ^ { \\star } } \\in \\mathbb { R } ^ { F \\times d _ { \\mathrm { a u d } } }$ . We passed all video features through a linear transformation layer with ReLU activation to the same embedding dimension $d$ . ", + "bbox": [ + 174, + 481, + 825, + 593 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "3.2 NEURAL MODULES ", + "text_level": 1, + "bbox": [ + 176, + 609, + 349, + 625 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "We introduce neural modules that are used to assemble an executable program constructed by the generated sequence from question parsers. We provide an overview of neural modules in Table 1 and demonstrate dialogue understanding and video understanding modules in Figure 3 and 4 respectively. Each module parameter, e.g. “a backpack”, is extracted from the parsed program. For each parameter, we denote $P \\in \\mathbb { R } ^ { d }$ as the average pooling of component token embeddings. ", + "bbox": [ + 174, + 636, + 825, + 705 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "find $( \\pmb { \\mathbb { P } } , \\pmb { \\mathbb { H } } ) \\to \\pmb { \\mathbb { H } } _ { \\mathrm { e n t } }$ . This module handles entity tracing by obtaining a distribution over tokens in dialogue history. We use an entity-to-dialogue-history attention mechanism applied from an entity $P _ { i }$ to all tokens in dialogue history. Any neural network that learn to generate attention between two tensors is applicable .e.g. (Bahdanau et al., 2015; Vaswani et al., 2017). The attention matrix normalized by softmax, $A _ { \\mathrm { f i n d , i } } \\in \\mathbb { R } ^ { L _ { \\mathrm { H } } }$ , is used to compute the weighted sum of dialogue history token representations. The output is combined with entity embedding $P _ { i }$ to obtain contextual entity representation $H _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { d }$ . ", + "bbox": [ + 174, + 713, + 825, + 810 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "summarize $( \\mathbf { \\delta H } _ { \\mathrm { e n t } } , \\mathbf { \\delta Q } ) \\to \\mathbf { \\delta Q } _ { \\mathrm { c t x } }$ . For each contextual entity representation $H _ { \\mathrm { e n t , i } }$ , $i = 1 , . . . , N _ { \\mathrm { e n t } }$ , it is projected to $L _ { \\mathrm { Q } }$ dimensions and is combined with question token embeddings through elementwise summation to obtain entity-aware question representation $Q _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { L _ { \\mathrm { Q } } \\times d }$ . It is fed to a one-dimensional CNN with max pooling layer (Kim, 2014) to obtain a contextual entity-aware question representation. We denote the final output as $Q _ { \\mathrm { c t x } } \\in \\mathbb { R } ^ { N _ { \\mathrm { e n t } } \\times d }$ . ", + "bbox": [ + 174, + 816, + 825, + 888 + ], + "page_idx": 3 + }, + { + "type": "text", + "text": "While previous models usually focus on global or token-level dependencies (Hori et al., 2019; Le et al., 2019b) to encode question features, our modules compress fine-grained question representations at entity level. Specifically, find and summarize modules can generate entity-dependent local and global representations of question semantics. We show that our modularized approach can achieve better performance and transparency than traditional approaches to encode dialogue context (Serban et al., 2016; Vaswani et al., 2017) (Section 4). ", + "bbox": [ + 173, + 895, + 823, + 924 + ], + "page_idx": 3 + }, + { + "type": "image", + "img_path": "images/f85b6a3de3efb5d106598bd63ca55e04399de8753853806ee05d04fae2725123.jpg", + "image_caption": [ + "Figure 3: find and summarize neural modules for dialogue understanding " + ], + "image_footnote": [], + "bbox": [ + 179, + 99, + 820, + 178 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 232, + 825, + 287 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "where $( \\pmb { \\mathrm { p } } , \\pmb { \\mathrm { v } } ) \\pmb { \\mathrm { v } } _ { \\mathrm { e n t } }$ . Similar to the find module, this module handle entity-based attention to the video input. However, the entity representation $P$ in this case is parameterized by the original entity in dialogue rather than in question (See Section 3.3 for more description). Each entity $P _ { i }$ is stacked to match the number of sampled video frames/clips $F$ . An attention network is used to obtain entity-to-object attention matrix $A _ { \\mathrm { w h e r e , i } } ^ { \\bullet } \\in \\mathbb { R } ^ { F \\times O }$ . The attended feature are compressed through weighted sum pooling along the spatial dimension, resulting in $V _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { F \\times d }$ , $i = 1 , . . . , N _ { \\mathrm { e n t } }$ . ", + "bbox": [ + 173, + 295, + 825, + 381 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "when $( \\mathbb { P } , \\pmb { \\nabla } _ { \\mathrm { e n t } } ) \\pmb { \\nabla } _ { \\mathrm { e n t + a c t } }$ . This module follows a similar architecture as the where module. However, the action parameter $P _ { i }$ is stacked to match $N _ { \\mathrm { e n t } }$ dimensions. The attention matrix $A _ { \\mathrm { w h e n , i } } \\in \\mathbb { R } ^ { F }$ is then used to compute the visual entity-action representations through weighted sum along the temporal dimension. We denote the output for all actions $P _ { i }$ as $V _ { \\mathrm { e n t + a c t } } \\in \\mathbb { R } ^ { N _ { \\mathrm { e n t } } \\times N _ { \\mathrm { a c t } } \\times d }$ describe $( \\mathbb { P } , \\nabla _ { \\mathrm { e n t + a c t } } ) \\to \\mathbf { \\nabla } \\mathbf { V } _ { \\mathrm { c t x } }$ . This module is a linear transformation to compute $V _ { \\mathrm { c t x } } ~ =$ ${ W _ { \\mathrm { d e s c } } } ^ { T } [ V _ { \\mathrm { e n t + a c t } } ; P _ { \\mathrm { s t a c k } } ] \\in \\mathbb { R } ^ { N _ { \\mathrm { e n t } } \\times N _ { \\mathrm { a c t } } \\times d }$ where $W _ { \\mathrm { d e s c } } \\in \\mathrm { R } ^ { 2 d \\times d }$ , $P _ { \\mathrm { s t a c k } }$ is the stacked representations of parameter embedding $P$ to $N _ { \\mathrm { e n t } } \\times N _ { \\mathrm { a c t } }$ dimensions, and $[ ; ]$ is the concatenation operation. ", + "bbox": [ + 174, + 387, + 825, + 445 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "", + "bbox": [ + 176, + 452, + 825, + 497 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "The exist module is a special case of describe module where the parameter $P$ is the average pooled question embeddings. The above where module is applied to object-level features. For temporal-based features such as CNN-based and audio features, the same neural operation is applied along the temporal dimension. Each resulting entity-aware output is then incorporated to frame-level features through element-wise summation (Please refer to Appendix A.1). ", + "bbox": [ + 174, + 502, + 825, + 573 + ], + "page_idx": 4 + }, + { + "type": "image", + "img_path": "images/fccd4959bc59d2dd1c8e856c9749101d47a87e9632762e7aba9a6f87cfbf6d66.jpg", + "image_caption": [ + "Figure 4: where and when neural modules for video understanding " + ], + "image_footnote": [], + "bbox": [ + 178, + 587, + 821, + 662 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "An advantage of our architecture is that it separates dialogue and video understanding. We adopt a transparent approach to solve linguistic entity references during the dialogue understanding phase. The resolved entities are fed to the video understanding phase to learn entity-action dynamics in video. We show that our approach is robust when dialogue evolves to many turns and video extends over time (Please see Section 4 and Appendix C). ", + "bbox": [ + 174, + 704, + 825, + 773 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "3.3 DECODERS ", + "text_level": 1, + "bbox": [ + 174, + 791, + 292, + 806 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "Question parsers. The parsers decompose questions into sub-sequences to construct compositional reasoning programs for dialogue and video understanding. Each parser is an attention-based Transformer decoder. Given the encoded question $Q$ , to decode program for dialogue understanding, the contextual signals are integrated through 2 attention layers: one attention on previously generated tokens, and the other on question tokens. ", + "bbox": [ + 174, + 819, + 825, + 888 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "To generate programs for video understanding, the contextual signals are learned and incorporated in a similar manner. However, to exploit dialogue contextual cues, the execution output of dialogue understanding neural modules $Q _ { \\mathrm { c t x } }$ (See Section 3.2) is incorporated to each vector in $P _ { \\mathrm { v i d } }$ through an additional attention layer. This layer integrates the entity-dependent contextual representations from $Q _ { \\mathrm { c t x } }$ to explicitly decode the original entities for video understanding programs. ", + "bbox": [ + 173, + 895, + 823, + 924 + ], + "page_idx": 4 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 103, + 823, + 146 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Response Decoder. System response is decoded by incorporating the dialogue context and video context outputs from the corresponding reasoning programs to target token representations. We follows a vanilla Transformer decoder architecture (Le et al., 2019b), which consists of 3 attention layers: self-attention to attend on existing tokens, attention to $Q _ { \\mathrm { c t x } }$ from dialogue understanding program execution, and attention to $V _ { \\mathrm { c t x } }$ from video understanding program execution. ", + "bbox": [ + 174, + 152, + 825, + 223 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Optimization. We use the standard cross-entropy losses for prediction of dialogue and video understanding programs and output responses. We optimize models by joint training to minimize: $\\begin{array} { r } { \\mathcal { L } = \\alpha \\mathcal { L } _ { \\mathrm { d i a l } } + \\beta \\mathcal { L } _ { \\mathrm { v i d } } + \\mathcal { L } _ { \\mathrm { r e s } } = \\alpha \\sum _ { j } - \\log ( \\mathbf { P } _ { \\mathrm { d i a l } } ( \\mathcal { P } _ { \\mathrm { d i a l } , \\mathbf { j } } ) ) + \\beta \\sum _ { l } - \\log ( \\mathbf { P } _ { \\mathrm { v i d e o } } ( \\mathcal { P } _ { \\mathrm { v i d e o } , 1 } ) ) + \\sum _ { n } - \\log ( \\mathbf { P } _ { \\mathrm { r e s } } ( \\mathcal { R } _ { \\mathrm { n } } ) ) } \\end{array}$ where $\\mathbf { P }$ is the probability distribution of an output token. The probability is computed by passing output representations from the parsers and decoder to a linear layer $\\dot { W } \\in \\mathbb { R } ^ { d \\times V }$ with softmax activation. We share the parameters between $W$ and embedding matrix $E$ . The hyper-parameters $\\alpha \\geq 0$ and $\\beta \\geq$ are fine-tuned during training. ", + "bbox": [ + 176, + 229, + 825, + 273 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 279, + 825, + 335 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "4 EXPERIMENTS ", + "text_level": 1, + "bbox": [ + 176, + 364, + 326, + 381 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Datasets. We use the AVSD benchmark from the $7 ^ { t h }$ Dialogue System Technology Challenge (DSTC7) (Hori et al., 2019). In the experiments with AVSD, we consider two settings: one with video summary and one without video summary as input. In the setting with video summary, the summary is concatenated to the dialogue history before the first dialogue turn. We also adapt VilNMN to the video QA benchmark TGIF-QA (Jang et al., 2017). Different from AVSD, TGIF-QA contains a diverse set of tasks, which address different visual aspects in video. ", + "bbox": [ + 174, + 401, + 825, + 486 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Training Procedure. We follow prior approaches (Hu et al., 2017; 2018; Kottur et al., 2018) by obtaining the annotations of the programs through a language parser (Hu et al., 2016) and a reference resolution model (Clark & Manning, 2016). During training, we directly use these soft labels of programs and the given ground-truth responses to train the models. The labels are augmented with label smoothing technique (Szegedy et al., 2016). During inference time, we generate all programs and responses from given dialogues and videos. We run beam search to enumerate programs for dialogue and video understanding and dialogue responses. (Please see Appendix B for more details). ", + "bbox": [ + 174, + 492, + 825, + 590 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "AVSD Results. We evaluate model performance by the objective metrics based on word overlapping, including BLEU (Papineni et al., 2002), METEOR (Banerjee & Lavie, 2005), ROUGE-L (Lin, 2004), and CIDEr (Vedantam et al., 2015), between each generated response and 6 reference gold responses. As seen in Table 2, our models outperform most of existing approaches. In particular, the performance of our model in the setting without video summary input is comparable to the GPT-based RLM (Li et al., 2020) with much smaller model size. The Student-Teacher baseline (Hori et al., 2019) specifically focuses on the performance gap between models with and without textual signals from video summary through a dual network of expert and student models. Instead, VilNMN reduces this performance gap through efficiently extracting relevant visual/audio information based on fine-grained entity and action signals. We also found that VilNMN applied on object-level features is competitive to the model applied on CNN-based features. The flexibility of VilNMN neural programs can also be seen in the experiment when the video understanding program is applied on the caption input as a visual feature. ", + "bbox": [ + 174, + 597, + 825, + 777 + ], + "page_idx": 5 + }, + { + "type": "text", + "text": "Ablation Analysis. We experiment with several variants of VilMNM (either NMN or non-NMNbased) in the setting with CNN based features and video summary input As can be seen in Table 3, our approach to video and dialogue understanding through compositional reasoning programs exhibits better performance than non-compositional approaches. Compared to the approaches that directly process frame-level features in videos (Row B) or token-level features in dialogues (Row C, D), our full VilNMN (Row A) considers entity-level and action-level information extraction and thus, avoids unnecessary and possibly noisy extraction. Compared to the approaches that obtain dialogue contextual cues through a hierarchical encoding architecture (Row E, F) such as (Serban et al., 2016; Hori et al., 2019), VilNMN directly addresses the challenge of entity references in dialogues. As mentioned, we hypothesize that the hierarchical encoding architecture is more appropriate for less entity-sensitive dialogues such as chit-chat and open-domain dialogues. Please see Appendix C for additional analysis of performance breakdown by dialogue turns and video lengths. ", + "bbox": [ + 173, + 784, + 825, + 924 + ], + "page_idx": 5 + }, + { + "type": "table", + "img_path": "images/32bb465e4936cc178783926f750ad8a86e6976966e86b8b1d28234e0bcaaf9a9.jpg", + "table_caption": [ + "Table 2: AVSD test results: The visual features are: I (I3D), ResNeXt-101 (RX), Faster-RCNN (FR), C (caption as a video input). The audio features are: VGGish (V), AclNet (A). Xon PT denotes models using pretrained weights and/or additional finetuning. Best and second best results are bold and underlined respectively. " + ], + "table_footnote": [], + "table_body": "
ModelPTVisualAudioBLEU4METEORROUGE-LCIDEr
Audio/Visual only (without Video Summary/Caption)
Baseline (Hori et al.,2019)I■0.3050.2170.4810.733
Baseline (Hori et al.,2019)IV0.3090.2150.4870.746
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3150.2390.5090.848
FGA (Schwartz et al.,2019)IV0.806
JMAN (Chu et al., 2020)I-0.3090.2400.5200.890
Student-Teacher (Hori et al.,2019)IV0.3710.2480.5270.966
MTN (Le et al.,2019b)I-0.3430.2470.5200.936
MTN (Le et al., 2019b)IV0.3680.2590.5370.964
MSTN (Lee et al.,2020)IV0.3790.2610.5481.028
RLM-GPT2 (Li et al., 2020)√IV0.4020.2540.5441.052
VilNMN=I-0.3970.2620.5501.059
VilNMNFR■0.3880.2590.5491.040
VilNMN-V0.3810.2520.5341.004
VilNMNIV0.3960.2630.5491.059
Audio/Visual only (with Video Summary/Caption)
TopicEmb (Kumar et al.,2019)IA0.3290.2230.4880.762
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3100.2420.5150.856
JMAN (Chu et al., 2020)I-0.3340.2390.5330.941
FA+HRED (Nguyen et al., 2018)=IV0.3600.2490.5440.997
VideoSum (Sanabria etal.,2019)=RX-0.3940.2670.5631.094
VideoSum+How2 (Sanabria et al.,2019)√RX-0.3870.2660.5641.087
MSTN (Lee et al.,2020)IV0.3770.2750.5661.115
Student-Teacher (Hori et al.,2019)IV0.4050.2730.5661.118
MTN (Le et al.,2019b)I-0.3920.2690.5591.066
MTN (Le et al.,2019b)IV0.4100.2740.5691.129
VGD-GPT2 (Le & Hoi,2020)√IV0.4360.2820.5791.194
RLM-GPT2 (Li et al., 2020)√IV0.4590.2940.6061.308
VilNMN■I10.4210.2770.5741.171
VilNMNFR-0.4210.2750.5711.148
VilNMNIV0.4210.2770.5731.167
VilNMNI+CV0.4290.2780.5781.188
", + "bbox": [ + 174, + 151, + 823, + 530 + ], + "page_idx": 6 + }, + { + "type": "table", + "img_path": "images/45d1a0e3d1e858e13c8e59ad95c7215837e70717f59a1b27f5eeecdd41fd6113.jpg", + "table_caption": [ + "Table 3: Ablation analysis of VilNMN with different model variants on the test split of the AVSD benchmark " + ], + "table_footnote": [], + "table_body": "
#ModelVariantBLEU4CIDEr
AFullVilNMN0.4211.171
BNo video NMNs; + vanilla text-→video attention0.4151.159
C→No dial.NMNs;+ response-→history attention0.4121.151
D→No dial.NMNs;+ response-→concat(history+question) attention0.4111.133
ENo dial.NMNs;+ HREDLsTM(history) + question attn.0.4141.153
F→No dial.NMNs; + HREDGRU(history) + question attn.0.4151.138
", + "bbox": [ + 240, + 571, + 756, + 655 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 686, + 823, + 715 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "Intepretability. A difference of VilNMN from previous approaches to video-grounded dialogues is the model interpretability based on the predicted dialogue and video programs. From Figure 5, we observe that in cases where predicted dialogue programs and video program match or are close to the gold labels, the model can generate generally correct responses. In cases of wrong predicted responses, we can further look at how the model understands the questions based on predicted programs. In the $3 ^ { r d }$ turn of example 1, the output response is missing a minor detail as compared to the label response because the video program fails to capture the parameter “rooftop”. These subtle yet important details can determine whether output responses can fully address user queries. Similarly, in example 2, the model answers the question “what room” instead of question about “an object”. For additional qualitative analysis, please see Appendix D. ", + "bbox": [ + 173, + 722, + 825, + 861 + ], + "page_idx": 6 + }, + { + "type": "text", + "text": "TGIF-QA Results. In TGIF-QA experiments, we report the result using the L2 loss in Count task and accuracy in other tasks. From Table 4, VilNMN outperforms all baseline models in all tasks by a large margin. Compared to AVSD experiments, the TGIF-QA experiments emphasize video understanding ability of the models, removing the requirement for dialogue understanding and natural language generation. This is demonstrated through higher performance gaps between VilNMN with generated programs and soft label programs as compared to ones in AVSD experiments. We also observe that an attention layer attending to question is important during the response decoding phase in TGIF-QA as there is no dialogue context $Q _ { \\mathrm { c t x } }$ in Video QA tasks. ", + "bbox": [ + 174, + 867, + 823, + 924 + ], + "page_idx": 6 + }, + { + "type": "image", + "img_path": "images/b76cdb81c535fa60c73e2ed0fbce53a5355fe5d0af1cb511403543cd18aa93a9.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 214, + 107, + 789, + 143 + ], + "page_idx": 7 + }, + { + "type": "table", + "img_path": "images/33e71536504413a88c710c5878224640309454fcf4bcf146c2fa0cdb4bbd1372.jpg", + "table_caption": [], + "table_footnote": [], + "table_body": "
TurnQuestionDialogue NMNVideo NMNResponse
3...what are theydoing in the scene ?are they on arooftop?Predicted:find(they),find(the scene)→summarize()×Gold: find(they)→summarize()Predicted: where(two men in thevideo),where(the scene)→when(doing inthe scene)→describe(what)Gold:where(two men),where (rooftop)→when(doing in the scene)-describe(what)Predicted: one is washinga chair and the other istaking picturesXGold: yes,on a secondfloor roof deck ,one man iswashing a chair,anotherman is either filming ortaking pictures
4does he sit in thechair after washingit?Predicted:find (he),find(the chair)→summarize()Gold: find(he),find(the chair)→summarize()Predicted: where(one man in the video),where(a chair)→ when(sit in the chairafter washing it)-exist()Gold:where(one man),where(a chair)→when(sit in the chair after washingit)-exist()Predicted: no, he does notsit in the chair√Gold: no he does not,thereis a pipe with water runningall over
", + "bbox": [ + 181, + 145, + 820, + 318 + ], + "page_idx": 7 + }, + { + "type": "image", + "img_path": "images/b2ce15a7da399a54da904703872d8a7d046bcc27067064f947a84577c92b87c0.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 215, + 321, + 774, + 357 + ], + "page_idx": 7 + }, + { + "type": "image", + "img_path": "images/181282280ef506314f5ed0b0226febd77d1a2bd127b0b5c7121f865b44526cc7.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 181, + 361, + 821, + 532 + ], + "page_idx": 7 + }, + { + "type": "table", + "img_path": "images/39a9caa58b578c606ce269d6b7819a57486a17e50febfa628a8eb262c45d475c.jpg", + "table_caption": [ + "Figure 5: Intepretability of model outputs from a dialogue in the test split of the AVSD benchmark. ", + "Table 4: Experiment results on the TGIF-QA benchmark. The visual features are: ResNet-152 (R), C3D (C), Flow CNN from two-stream model (F), VGG (V), ResNeXt-101 (RX). " + ], + "table_footnote": [], + "table_body": "
ModelVisualCount (Loss)Action (Acc)Transition (Acc)FrameQA (Acc)
VIS(avg) (Ren et al.,2015a)R4.800.4880.3480.350
MCB (aggr) (Fukui et al.,2016)R5.170.5890.2430.257
Yu et al. (Yu et al., 2017)R5.130.5610.6400.396
ST-VQA (t) (Gao et al., 2018)R+F4.320.6290.6940.495
Co-Mem (Gao et al.,2018)R+F4.100.6820.7430.515
PSAC (Li et al.,2019)R4.270.7040.7690.557
HME (Fan et al.,2019)R+C4.020.7390.7780.538
STA (Gao et al.,2019)R4.250.7230.7900.566
CRN+MAC (Le et al.,2019c)R4.230.7130.7870.592
MQL (Lei et al., 2020)V---0.598
QueST (Jiang et al.,2020)R4.190.7590.8100.597
HGA (Jiang & Han,2020)R+C4.090.7540.8100.551
GCN (Huang et al., 2020)R+C3.950.7430.8110.563
HCRN (Le et al.,2020)R+RX3.820.7500.8140.559
VilNMNR2.650.8450.8870.747
→soft label programsR1.900.8570.8980.780
→- res-to-question attn.R3.280.8010.7760.679
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", + "bbox": [ + 176, + 684, + 825, + 728 + ], + "page_idx": 12 + }, + { + "type": "text", + "text": "A ADDITIONAL MODEL DETAILS ", + "text_level": 1, + "bbox": [ + 176, + 102, + 467, + 118 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "A.1 NEURAL MODULES ON TEMPORAL FEATURES ", + "text_level": 1, + "bbox": [ + 174, + 133, + 532, + 147 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "To adapt our neural modules to temporal features, we apply the same neural architectures in all modules except for the where module. In object-level features, this module operates on object-based or spatial-based level. We can apply this module to temporal-based features similarly simply by not stacking the parameter and pooling the attended features along the temporal dimension. For an entity parameter $P _ { i }$ , the attention matrix in this case is an entity-to-temporal-step matrix $A _ { \\mathrm { w h e r e , i } } \\in \\mathbb { R } ^ { \\tilde { F } }$ and the resulting pooled feature is $V _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { d }$ . Before feeding this representation to a when module, we incorporate each $V _ { \\mathrm { e n t , i } }$ into feature of each temporal step through an MLP layer and element-wise summation, resulting in overview of the where $V _ { \\mathrm { e n t , i } } ^ { s t a c k } \\in \\mathbb { R } ^ { \\mathrm { F } \\times d }$ where poral $F$ is the number of sampled video frames/clips. Antures can be seen in Figure 6. ", + "bbox": [ + 173, + 159, + 826, + 287 + ], + "page_idx": 13 + }, + { + "type": "image", + "img_path": "images/00f0a2cc042a838be019c96ec5a63325ec1007abd58e16de83f1037dc0c8f8c8.jpg", + "image_caption": [ + "Figure 6: Adaptation of the where module to temporal-based features " + ], + "image_footnote": [], + "bbox": [ + 274, + 299, + 725, + 375 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "We adapt this module in a similar manner to other temporal-level features such as audio and textual features such as video caption. We keep the same architecture in the when module. We denote the resulting output from the when module for all actions $P _ { i }$ is $V _ { \\mathrm { a c t } } \\in \\mathbb { R } ^ { N _ { \\mathrm { a c t } } \\times d }$ . We concatenate this to the output from the previous where module $V _ { \\mathrm { e n t } }$ to obtain $V _ { \\mathrm { e n t + a c t } } \\in \\mathbb { R } ^ { ( N _ { \\mathrm { e n t } } + N _ { \\mathrm { a c t } } ) \\times d }$ . This is used as input to the describe or exist module. ", + "bbox": [ + 173, + 421, + 826, + 493 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "A.2 QUESTION PARSER ", + "text_level": 1, + "bbox": [ + 176, + 510, + 351, + 525 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "The parsers decompose questions into sub-sequences to construct compositional reasoning programs for dialogue and video understanding. Each parser is an attention-based Transformer decoder. The Transformer attention is a multi-head attention on query, key, and value tensors, denoted as Attention(Query, Key, Value). For each token in the Query sequence , the distribution over tokens in the Key sequence is used to obtain the weighted sum of the corresponding representations in the Value sequence. ", + "bbox": [ + 173, + 535, + 826, + 619 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/894e461c9beb521e1344e910a38eadfd669bec601fba5781d38ce4f55ed8ddac.jpg", + "text": "$$\n{ \\mathrm { A t t e n t i o n } } ( Q u e r y , K e y , V a l u e ) = { \\mathrm { s o f t m a x } } ( { \\frac { Q u e r y K e y ^ { T } } { \\sqrt { d _ { k e y } } } } ) V a l u e \\in \\mathbb { R } ^ { L _ { \\mathrm { q u e r y } } \\times d _ { \\mathrm { q u e r y } } }\n$$", + "text_format": "latex", + "bbox": [ + 217, + 622, + 777, + 661 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Each attention is followed by a feed-forward network applied on each position identically. We exploit the multi-head and feed-forward architecture, which show good performance in NLP tasks such as NMT and QA (Vaswani et al., 2017; Dehghani et al., 2019), to efficiently incorporate contextual cues from dialogue components to parse question into reasoning programs. Given the encoded question $Q$ , to decode program for dialogue understanding, the contextual signals are integrated through 2 attention layers: one attention on previously generated tokens, and the other on question tokens. At time step $j$ , we denote the output from an attention layer as $A _ { \\mathrm { d i a l , j } }$ . ", + "bbox": [ + 173, + 662, + 826, + 761 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/380438424de5e6a09cf9c72fd9b30ed10dd2548384f941d193ddbb7541916e97.jpg", + "text": "$$\n\\begin{array} { r l } & { A _ { \\mathrm { d i a l } } ^ { ( 1 ) } = \\mathrm { A t t e n t i o n } ( P _ { \\mathrm { d i a l } } | _ { 0 } ^ { j - 1 } , P _ { \\mathrm { d i a l } } | _ { 0 } ^ { j - 1 } , P _ { \\mathrm { d i a l } } | _ { 0 } ^ { j - 1 } ) \\in \\mathbb { R } ^ { j \\times d } } \\\\ & { A _ { \\mathrm { d i a l } } ^ { ( 2 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { d i a l } } ^ { ( 1 ) } , Q , Q ) \\in \\mathbb { R } ^ { j \\times d } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 302, + 765, + 696, + 810 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "Similarly, to generate programs for video understanding, the contextual signals are learned and incorporated in a similar manner. However, to exploit dialogue contextual cues, the execution output of dialogue understanding neural modules $Q _ { \\mathrm { c t x } }$ is incorporated to each vector in $P _ { \\mathrm { d i a l } }$ through an additional attention layer. This layer integrates the resolved entity information to decode the original entities for video understanding. It is equivalent to a reasoning process that converts the question from its original multi-turn semantics to single-turn semantics. ", + "bbox": [ + 173, + 818, + 826, + 901 + ], + "page_idx": 13 + }, + { + "type": "equation", + "img_path": "images/335ad4722cdd4bc3bba8fb642d8cfdf0d0e4a5a042b1db1e3ba3900ae0c730af.jpg", + "text": "$$\n{ \\cal A } _ { \\mathrm { v i d } } ^ { ( 3 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { v i d } } ^ { ( 2 ) } , Q _ { \\mathrm { c t x } } , Q _ { \\mathrm { c t x } } ) \\in \\mathbb { R } ^ { j \\times d }\n$$", + "text_format": "latex", + "bbox": [ + 348, + 905, + 650, + 926 + ], + "page_idx": 13 + }, + { + "type": "text", + "text": "A.3 NON-NMN MODELS ", + "text_level": 1, + "bbox": [ + 176, + 103, + 364, + 117 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "For ablation analysis, we evaluate several variants of VilNMN, based on the following categories: ", + "bbox": [ + 171, + 128, + 812, + 145 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "To test the contribution of our NMN approach for video understanding, we remove the parser for video understanding program and related neural modules and replace them with pure neural network architecture (Model $B$ ). Specifically, we remove neural modules where, when, describe, and exist. We then directly use video feature embeddings $V$ as $V _ { \\mathrm { c t x } }$ as input to the original attention layer in response decoder similarly to (Hori et al., 2019; Sanabria et al., 2019). ", + "bbox": [ + 173, + 150, + 825, + 220 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/a64039d80b0768602dda3b32d7281868fb23b3f63ea8cf6017adafc8f16007e0.jpg", + "text": "$$\nA _ { \\mathrm { r e s } } ^ { ( 3 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 2 ) } , V , V ) \\in \\mathbb { R } ^ { j \\times d }\n$$", + "text_format": "latex", + "bbox": [ + 369, + 227, + 629, + 246 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "To further test the contribution of NMN architecture for dialogue understanding, we similarly remove the question parser for dialogue understanding program and neural modules find and describe. We then directly use the dialogue history embeddings $H$ and question embeddings $Q$ as inputs to the response decoder in two different ways. First, we replace the original attention on dialogue context $Q _ { \\mathrm { c t x } }$ with two attention layers to attend on dialogue history and question sequentially (Model $C$ ). As noted by Le et al. (2019b), question input contains much more relevant signals than dialogue history and attention operation should be separated from the one on dialogue history. ", + "bbox": [ + 173, + 251, + 825, + 351 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/67b6fd4ca874e4b641145983c7d5e1caccd86a85b112bff258860efc295e4c70.jpg", + "text": "$$\n\\begin{array} { r } { A _ { \\mathrm { r e s } } ^ { ( 2 a ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 1 ) } , H , H ) \\in \\mathbb { R } ^ { j \\times d } } \\\\ { A _ { \\mathrm { r e s } } ^ { ( 2 b ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 2 a ) } , Q , Q ) \\in \\mathbb { R } ^ { j \\times d } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 361, + 354, + 637, + 398 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "Alternatively, we simply concatenate dialogue and question embeddings similarly to (Hori et al., 2019; Sanabria et al., 2019) and use it as input to the original attention layer (Model $D$ ). ", + "bbox": [ + 173, + 402, + 823, + 431 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/9807127436c12da449db19c4727e8cd774eaf3bc4bac9d756378aa28cc1fd385.jpg", + "text": "$$\nA _ { \\mathrm { r e s } } ^ { ( 2 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 1 ) } , [ H ; Q ] , [ H ; Q ] ) \\in \\mathbb { R } ^ { j \\times d }\n$$", + "text_format": "latex", + "bbox": [ + 336, + 436, + 661, + 457 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "To use more sophisticated neural models for dialogue understanding, we further adopt the hierarchical encoding architecture with question attention (Li et al., 2016; Serban et al., 2016; Hori et al., 2019). Each dialogue turn $\\mathcal { H } _ { t }$ , including a pair of human utterance and system response, is processed separately by a word-level RNN such as LSTM (Model $E$ ) or GRU (Model $F$ ). A sentence-level RNN is used to sequentially process the last hidden states obtained previously turn by turn. The output in each recurrent step is fed to an attention layer such as (Bahdanau et al., 2015; Vaswani et al., 2017) to obtain question-aware representations of dialogue history. ", + "bbox": [ + 173, + 462, + 826, + 560 + ], + "page_idx": 14 + }, + { + "type": "equation", + "img_path": "images/6b500eb54336338b23fae1788baf2b04763d7328a4509692dfd78778ea5abe21.jpg", + "text": "$$\n\\begin{array} { r l } & { H _ { t } ^ { \\mathrm { w o r d } } = \\mathrm { R N N } ( H _ { t } ) \\in \\mathbb { R } ^ { d } } \\\\ & { H _ { t } ^ { \\mathrm { s e n t } } = \\mathrm { R N N } ( H _ { t } ^ { \\mathrm { w o r d } } ) \\in \\mathbb { R } ^ { d } } \\\\ & { \\qquad H = [ H _ { t } ^ { \\mathrm { s e n t } } ] | _ { t = 1 } ^ { T - 1 } \\in \\mathbb { R } ^ { d \\times ( T - 1 ) } } \\\\ & { Q _ { \\mathrm { c t x } } = \\mathrm { A t t e n t i o n } ( Q , H , H ) \\in \\mathbb { R } ^ { L _ { Q } \\times d } } \\end{array}\n$$", + "text_format": "latex", + "bbox": [ + 361, + 564, + 637, + 647 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "where $T$ is the current dialogue turn. The output is treated as $Q _ { \\mathrm { c t x } }$ and is fed to the corresponding attention layer in the response decoder. ", + "bbox": [ + 173, + 652, + 823, + 681 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "B ADDITIONAL EXPERIMENT DETAILS ", + "text_level": 1, + "bbox": [ + 174, + 700, + 513, + 717 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "B.1 DATASETS ", + "text_level": 1, + "bbox": [ + 174, + 732, + 290, + 747 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "We use the AVSD benchmark from DSTC7 (Hori et al., 2019) which consists of dialogues grounded on the Charades videos (Sigurdsson et al., 2016). Each dialogue contains up to 10 dialogue turns, each turn consists of a question and expected response about a given video. For visual features, we use the 3D CNN based features from a pretrained I3D model (Carreira & Zisserman, 2017) and object-level features from a pretrained FasterRNN model (Ren et al., 2015b). The audio features are obtained from a pretrained VGGish model (Hershey et al., 2017). In the experiments with AVSD, we consider two settings: one with video summary and one without video summary as input. In the setting with video summary, the summary is concatenated to the dialogue history before the first dialogue turn. We also adapt VilNMN to the video QA benchmark TGIF-QA (Jang et al., 2017). Different from AVSD, TGIF-QA contains a diverse set of QA tasks: ", + "bbox": [ + 173, + 757, + 826, + 897 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "• Count: open-ended task which counts the number of repetitions of an action • Action: multiple-choice (MC) task which asks about a certain action occurring for a fixed number of times • Transition: MC task which emphasizes temporal transition in video • Frame: open-ended task which can be answered from visual contents of one of video frames ", + "bbox": [ + 217, + 909, + 730, + 924 + ], + "page_idx": 14 + }, + { + "type": "text", + "text": "", + "bbox": [ + 218, + 103, + 825, + 170 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "For the TGIF-QA benchmark, we use the extracted features from a pretrained ResNet model (He et al., 2016). ", + "bbox": [ + 169, + 179, + 825, + 208 + ], + "page_idx": 15 + }, + { + "type": "table", + "img_path": "images/057536ca5fb42f426767597d75a989865e3eba12ccdb91afc2f12866db2f8544.jpg", + "table_caption": [ + "Table 5: Summary of DSTC7 AVSD and TGIF-QA benchmark " + ], + "table_footnote": [], + "table_body": "
#TrainVal.Test
AVSDDialogs7,6591,7871,710
Turns153,18035,74013,490
Words1,450,754339,006110,252
TGIFQACount QA24,1592,6843,554
Action QA18,4282,0472,274
Trans. QA47,4345,2706,232
Frame QA35,4533,93913,691
", + "bbox": [ + 310, + 244, + 687, + 351 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "B.2 TRAINING DETAILS ", + "text_level": 1, + "bbox": [ + 174, + 373, + 354, + 387 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "We use a training batch size of 32 and embedding dimension $d = 1 2 8$ in all experiments. Where Transformer attention is used, we fix the number of attention heads to 8 in all attention layers. In neural modules with MLP layers, the MLP network is fixed to 2 linear layers with a ReLU activation in between. In neural modules with CNN, we adopt a vanilla CNN architecture for text classification (without the last MLP layer) where the number of input channels is 1, the kernel sizes are $\\{ 3 , 4 , 5 \\}$ , and the number of output channels is $d$ . We initialize models with uniform distribution (Glorot & Bengio, 2010). During training, we adopt the Adam optimizer (Kingma & Ba, 2015) and a decaying learning rate Vaswani et al. (2017) where we fix the warm-up steps to 15K training steps. We employ dropout (Srivastava et al., 2014) of 0.2 at all networks except the last linear layers of question parsers and response decoder. We train models up to 50 epochs and select the best models based on the average loss per epoch in the validation set. ", + "bbox": [ + 173, + 398, + 826, + 553 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "C ADDITIONAL RESULTS ", + "text_level": 1, + "bbox": [ + 176, + 571, + 398, + 588 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "To evaluate model robustness, we report the relative performance by calculating the difference of CIDEr in experimental settings against the most basic setting. Specifically, we compare against performance of output responses in the first dialogue turn position (i.e. $2 ^ { n \\dot { d } } – 1 0 ^ { t h }$ turn vs. the $1 ^ { s t }$ turn), or responses grounded on the shortest video length range (video ranges are intervals of $0 – 1 0 ^ { t h }$ , $1 0 \\ – 2 0 ^ { t h }$ percentile and so on). We report the results of the model variants A, B, and E (See the Ablation Analysis section in the main paper and Appendix A.3 for model description). First, as can be seen in Figure 7, for various dialogue turn positions, we observe that the original VilNMN (model A) suffers less than model E when dialogues extend over time up the $8 ^ { t h }$ turn. This explains the contribution of dialogue understanding modules in solving entities even when the dialogues grow longer. Secondly, as compared to model B, we observe that the Full VilNMN (model A) is less affected as the videos grounding the dialogues grow longer. The difference is clear when the video length increases up to 33 seconds. ", + "bbox": [ + 173, + 603, + 825, + 770 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "We also report the absolute scores and compare model variants. In Table 6a, we compare model variants B and E. We observe that model B generally performs better than model E in overall, especially in higher turn positions, i.e. from the $4 ^ { t h }$ turn to $8 ^ { t h }$ turn. Interestingly, we note some mixed results in very low turn position, i.e. the $2 ^ { n d }$ and $3 ^ { r d }$ turn, and very high turn position, i.e. the $1 0 ^ { t h }$ turn. Potentially, in very high turn position, the neural based approach such as hierarchical RNN can better capture the global dependencies within dialogue context than the entity-based compositional NMN method. ", + "bbox": [ + 174, + 777, + 825, + 875 + ], + "page_idx": 15 + }, + { + "type": "text", + "text": "In Table 6b, we compare model variants A and B. We note that the performance gap between model A and B is quite distinct, with 7/10 cases of video ranges in which model A outperforms. However, similarly to our prior observations in experiments by dialogue turn, in lower ranges (i.e. 1-23 seconds) and higher ranges (37-75 seconds), model A performs not as well as model B. There are additional factors that we will need to examine further to explain the results, such as the complexity of the questions for these short and long-range videos. Potentially, our question parser for video understanding program needs more sophisticated composition method to retrieve information from these video ranges. ", + "bbox": [ + 176, + 882, + 825, + 924 + ], + "page_idx": 15 + }, + { + "type": "image", + "img_path": "images/398de27efc81f7e3642d1abc7c7b4de47175198fb1e45e3f27e2fc1e430a106c.jpg", + "image_caption": [ + "Figure 7: Performance of model variants A, B, and E, by dialogue turn position and video length. The performance is calculated relatively to performance of the most basic setting, i.e. responses of the first dialogue turn $\\Delta \\mathrm { C I D E r _ { t u r n \\_ i } } = \\mathrm { C I D E r _ { t u r n \\_ i } } - \\mathrm { C I D E r _ { t u r n \\_ 1 } }$ , or responses grounding on the lowest video range (0 to 23 seconds) $\\Delta \\mathrm { C I D E r _ { r a n g e \\mathrm { _ i } } } = \\mathrm { C I D E r _ { r a n g e \\mathrm { _ i } } } - \\mathrm { C I D E r _ { 0 - 2 3 } }$ . " + ], + "image_footnote": [], + "bbox": [ + 181, + 103, + 815, + 276 + ], + "page_idx": 16 + }, + { + "type": "table", + "img_path": "images/73e24b5fb7c70449fd1da2a91d16a5d31fb3c543a6d4c9cf39a066804160be6e.jpg", + "table_caption": [ + "Table 6: Performance breakdown in BLEU4 and CIDEr ", + "(a) by dialogue turn between model variants B and E. " + ], + "table_footnote": [], + "table_body": "
BLEU4CIDEr
turn positionModel BModel EModel BModel E
10.5790.5871.6231.650
20.4290.4301.1551.142
30.2750.2890.8670.846
40.3090.3050.8590.855
50.3550.3351.0881.023
60.3570.3291.0440.950
70.3420.3250.8960.847
80.3610.3321.0250.973
90.3830.4311.0431.182
100.3950.3710.9310.977
", + "bbox": [ + 282, + 424, + 709, + 594 + ], + "page_idx": 16 + }, + { + "type": "table", + "img_path": "images/44c07e6525454cb2469d907cda1fd76adf3ba08c705eaf1f74e3b93ca2b12dab.jpg", + "table_caption": [ + "(b) by video length range (in seconds) between model variants A and B. " + ], + "table_footnote": [], + "table_body": "
BLEU4CIDEr
video range (seconds)Model AModel BModel AModel B
1-230.4320.4471.2981.355
23-280.4360.4331.2641.165
28-300.3980.3761.2031.164
30-30.60.4410.4181.2201.202
30.6-310.4130.4111.2501.166
31-31.60.4390.4511.2491.295
31.6-320.4300.4191.2171.192
32-330.4680.4451.3431.237
33-370.3880.3811.1491.124
37-750.3560.3650.9100.962
", + "bbox": [ + 287, + 622, + 709, + 806 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "", + "bbox": [ + 174, + 853, + 825, + 924 + ], + "page_idx": 16 + }, + { + "type": "text", + "text": "D QUALITATIVE ANALYSIS ", + "text_level": 1, + "bbox": [ + 176, + 102, + 415, + 118 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "We extract the predicted programs and responses for some example dialogues in Figure 8, 9, 10, and 11 and report our observations: ", + "bbox": [ + 173, + 133, + 823, + 161 + ], + "page_idx": 17 + }, + { + "type": "text", + "text": "• We observe that when the predicted programs are correct, the output responses generally match the ground-truth (See the $1 ^ { s t }$ and $2 ^ { n d }$ turn in Figure 8, and the $1 ^ { s t }$ and $4 ^ { { \\bar { t } } h }$ turn in Figure 10) or close to the ground-truth responses ( $1 ^ { s t }$ turn in Figure 9). \n• When the output responses do not match the ground truth, we can understand the model mistakes by interpreting the predicted programs. For example, in the $3 ^ { r d }$ turn in Figure 8, the output response describes a room because the predicted video program focuses on the entity “what room” instead of the entity “an object” in the question. Another example is the $3 ^ { \\dot { r } d }$ turn in Figure 10 where the entity “rooftop” is missing in the video program. These mismatches can deviate the information retrieved from the video during video program execution, leading to wrong output responses with wrong visual contents. \nWe also note that in some cases, one or both of the predicted programs are incorrect, but the predicted responses still match the ground-truth responses. This might be explained as the predicted module parameters are not exactly the same as the ground truth but they are close enough (e.g. $4 ^ { t h }$ turn in Figure 8). Sometimes, our model predicted programs that are more appropriate than the ground truth. For example, in the $2 ^ { { \\bar { n } } d }$ turn in Figure 9, the program is added with a where module parameterized by the entity “the shopping bag” which was solved from the reference “them” mentioned in the question. \n• We observe that for complex questions that involve more than one queries (e.g. the $3 ^ { r d }$ turn in Figure 10), it becomes more challenging to decode an appropriate video understanding program and generate responses that can address all queries. \n• In Figure 11, we demonstrate some output examples of VilNMN and compare with two baselines: Baseline (Hori et al., 2019) and MTN (Le et al., 2019b). We noted that VilNMN can include important entities relevant to the current dialogue turn to construct output responses while other models might miss some entity details, e.g. “them/dishes” in example A and “the magazine” in example B. These small yet important details can determine the correctness of dialogue responses. ", + "bbox": [ + 217, + 174, + 825, + 556 + ], + "page_idx": 17 + }, + { + "type": "image", + "img_path": "images/5e39bc95a0ceb8e3fb3d5469b7dd1efdd1618424facc2e40e32d72bd986dd909.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 209, + 132, + 794, + 167 + ], + "page_idx": 18 + }, + { + "type": "image", + "img_path": "images/4418977275529630c424ae9a011e6eb6302163738aca0446dbfdcd78de7e81e8.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 174, + 172, + 818, + 508 + ], + "page_idx": 18 + }, + { + "type": "image", + "img_path": "images/5ae7eb0ce394e9a325452d0eab7ff74705e152d97186a68063a0e73b0f9fe07c.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 209, + 606, + 787, + 643 + ], + "page_idx": 18 + }, + { + "type": "image", + "img_path": "images/d13d1be16d3744b012c2f4f68213120b43ec9510bcc6defd08e26fb98b5bceec.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 176, + 645, + 818, + 866 + ], + "page_idx": 18 + }, + { + "type": "image", + "img_path": "images/bcaefdb7909d644203e7c3e16b22b646729f276040913b46cc890612139a86e9.jpg", + "image_caption": [], + "image_footnote": [], + "bbox": [ + 194, + 127, + 797, + 165 + ], + "page_idx": 19 + }, + { + "type": "table", + "img_path": "images/cb9d48d1285ba2803fe38b1d96f3f6eab058cf35aec13929da3a49ac899515af.jpg", + "table_caption": [ + "Figure 10: Example output programs and responses from a dialogue in the test split of the AVSD benchmark. " + ], + "table_footnote": [], + "table_body": "
TurnQuestionDialogue UnderstandingProgramVideo UnderstandingProgramResponse
1hi how many peopleare in the video fromstart to finish ?Predicted: summari ze()Gold: summarize ()Predicted: describe (how manypeople)Gold:describe (how manypeople)Predicted: there are twopeople in the video.Gold: hello,there aretwo men
2are they carrying ona conversationbetween themselves?Predicted:find(they)→summarize()Gold:find(they),find(themselves)→summarize()Predicted: where(two men in the←video)→when(carrying on aconversation betweenthemselves)-exist()Gold:where(two men)→ when(carrying a conversationbetween themselves)-exist()Predicted: yes,they arecarrying a conversation×Gold: no,backgroundnoise is birdsong andshuffling noises
3what are they doingin the scene ?arethey on a rooftop ?Predicted: find(they),find(the scene)→summarize() ×Gold: find(they)→summarize()Predicted:where(two men in thevideo),where(the scene)→when(doing in the scene)→describe(what) ×Gold: where(two men),where(rooftop)→when(doingin the scene)-describe(what)Predicted: one iswashing a chair and theother is taking pictures×Gold: yes,on a secondfloor roof deck ,oneman is washing a chair,another man is eitherfilming or taking pictures
4does he sit in thechair after washingit?Predicted: find(he),find(the chair)→summarize()Gold: find (he),find(the chair)→summarize()Predicted: where(one man in thevideo),where(a chair)→when(sit in the chair afterwashing it)→exist()Gold:where(one man),where(achair)→ when(sit in thechair after washing it)→exist()Predicted: no,he doesnot sit in the chairGold: no he does not,there is a pipe withwater running all over
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(2019) further", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 468, + 506, + 480 + ], + "spans": [ + { + "bbox": [ + 106, + 468, + 506, + 480 + ], + "score": 1.0, + "content": "develop video-grounded language research into the dialogue domain. In the proposed task, video-", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "score": 1.0, + "content": "grounded dialogues, the dialogue agent is required to answer questions about a video over multiple", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 489, + 505, + 502 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 505, + 502 + ], + "score": 1.0, + "content": "dialogue turns. 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However, very", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 141, + 236, + 470, + 249 + ], + "spans": [ + { + "bbox": [ + 141, + 236, + 470, + 249 + ], + "score": 1.0, + "content": "limited work on NMN has been studied in the video-grounded language tasks.", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 141, + 247, + 471, + 259 + ], + "spans": [ + { + "bbox": [ + 141, + 247, + 471, + 259 + ], + "score": 1.0, + "content": "These tasks extend the complexity of traditional visual tasks with the additional vi-", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 141, + 258, + 470, + 272 + ], + "spans": [ + { + "bbox": [ + 141, + 258, + 470, + 272 + ], + "score": 1.0, + "content": "sual temporal variance. 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Our experiments", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 141, + 334, + 470, + 348 + ], + "spans": [ + { + "bbox": [ + 141, + 334, + 470, + 348 + ], + "score": 1.0, + "content": "show that VilNMN can achieve promising performance on two video-grounded", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 141, + 345, + 374, + 359 + ], + "spans": [ + { + "bbox": [ + 141, + 345, + 374, + 359 + ], + "score": 1.0, + "content": "language tasks: video QA and video-grounded dialogues.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 11, + "bbox_fs": [ + 141, + 214, + 471, + 359 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 385, + 206, + 398 + ], + "lines": [ + { + "bbox": [ + 105, + 384, + 208, + 401 + ], + "spans": [ + { + "bbox": [ + 105, + 384, + 208, + 401 + ], + "score": 1.0, + "content": "1 INTRODUCTION", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 107, + 412, + 505, + 534 + ], + "lines": [ + { + "bbox": [ + 106, + 412, + 505, + 425 + ], + "spans": [ + { + "bbox": [ + 106, + 412, + 505, + 425 + ], + "score": 1.0, + "content": "Vision-language tasks have been studied to build intelligent systems that can perceive information", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 425, + 506, + 436 + ], + "spans": [ + { + "bbox": [ + 106, + 425, + 506, + 436 + ], + "score": 1.0, + "content": "from multiple modalities, such as images, videos, and text. Extended from imaged-grounded tasks,", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 434, + 506, + 447 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 506, + 447 + ], + "score": 1.0, + "content": "e.g. (Antol et al., 2015), recently Jang et al. (2017); Lei et al. (2018) propose to use video as the", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 446, + 506, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 446, + 506, + 459 + ], + "score": 1.0, + "content": "grounding features. This modification poses a significant challenge to previous image-based models", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 456, + 506, + 469 + ], + "spans": [ + { + "bbox": [ + 106, + 456, + 506, + 469 + ], + "score": 1.0, + "content": "with the additional temporal variance through video frames. Recently Alamri et al. (2019) further", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 468, + 506, + 480 + ], + "spans": [ + { + "bbox": [ + 106, + 468, + 506, + 480 + ], + "score": 1.0, + "content": "develop video-grounded language research into the dialogue domain. In the proposed task, video-", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "score": 1.0, + "content": "grounded dialogues, the dialogue agent is required to answer questions about a video over multiple", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 489, + 505, + 502 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 505, + 502 + ], + "score": 1.0, + "content": "dialogue turns. 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However, these approaches often assume the", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 572, + 505, + 585 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 505, + 585 + ], + "score": 1.0, + "content": "reasoning structure, including resolving references of entities and detecting the corresponding actions", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 583, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 583, + 506, + 596 + ], + "score": 1.0, + "content": "to retrieve visual cues, is implicitly learned. An explicit reasoning structure becomes more beneficial", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 594, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 505, + 607 + ], + "score": 1.0, + "content": "as the tasks complicates in two scenarios: video with complex spatial and temporal dynamics, and", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 605, + 505, + 618 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 505, + 618 + ], + "score": 1.0, + "content": "language inputs with sophisticated semantic dependencies, e.g. questions positioned in a dialogue", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 615, + 505, + 630 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 505, + 630 + ], + "score": 1.0, + "content": "context. In these cases, it becomes challenging to interpret model outputs, assess model reasoning", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 627, + 333, + 640 + ], + "spans": [ + { + "bbox": [ + 106, + 627, + 333, + 640 + ], + "score": 1.0, + "content": "capability, and identify errors in neural network models.", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 34, + "bbox_fs": [ + 105, + 538, + 507, + 640 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 643, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 643, + 505, + 657 + ], + "spans": [ + { + "bbox": [ + 105, + 643, + 505, + 657 + ], + "score": 1.0, + "content": "Similar challenges have been observed in image-grounded tasks in which deep neural networks often", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 655, + 506, + 667 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 506, + 667 + ], + "score": 1.0, + "content": "exhibit shallow understanding capability as they simply exploit superficial visual cues (Agrawal et al.,", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 664, + 505, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 664, + 505, + 679 + ], + "score": 1.0, + "content": "2016; Goyal et al., 2017; Feng et al., 2018; Serrano & Smith, 2019). Andreas et al. (2016b) propose", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 677, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 505, + 690 + ], + "score": 1.0, + "content": "neural model networks (NMNs) by decomposing a question into sub-sequences called program", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 687, + 505, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 505, + 701 + ], + "score": 1.0, + "content": "and assembling a network of neural operations. Motivated by this line of research, we propose an", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "NMN approach to video-grounded language tasks. Our approach benefits from integrating neural", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 710, + 507, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 507, + 722 + ], + "score": 1.0, + "content": "networks with a compositional reasoning structure to exploit low-level information signals in video.", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 106, + 721, + 426, + 733 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 426, + 733 + ], + "score": 1.0, + "content": "An example of the reasoning structure can be seen on the right side of Figure 1.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 42.5, + "bbox_fs": [ + 105, + 643, + 507, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 110, + 80, + 502, + 210 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 80, + 502, + 210 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 80, + 502, + 210 + ], + "spans": [ + { + "bbox": [ + 110, + 80, + 502, + 210 + ], + "score": 0.972, + "type": "image", + "image_path": "08dfa3054943d0f06eb58bf4e0e2e48e82ee934f1926997c0219cf2c8c6783ea.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 110, + 80, + 502, + 123.33333333333334 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 110, + 123.33333333333334, + 502, + 166.66666666666669 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 110, + 166.66666666666669, + 502, + 210.00000000000003 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 219, + 506, + 250 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 219, + 506, + 231 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 506, + 231 + ], + "score": 1.0, + "content": "Figure 1: A sample video-grounded dialogue: Inputs are question, dialogue history, video with caption, visual", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 230, + 505, + 240 + ], + "spans": [ + { + "bbox": [ + 106, + 230, + 505, + 240 + ], + "score": 1.0, + "content": "and audio input, and the output is the answer to the question. On the right side, we demonstrate an example", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 239, + 492, + 251 + ], + "spans": [ + { + "bbox": [ + 106, + 239, + 492, + 251 + ], + "score": 1.0, + "content": "symbolic reasoning process a dialogue agent can perform to extract textual and visual clues for the answer.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4 + } + ], + "index": 2.5 + }, + { + "type": "text", + "bbox": [ + 106, + 271, + 505, + 349 + ], + "lines": [ + { + "bbox": [ + 105, + 271, + 506, + 285 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 506, + 285 + ], + "score": 1.0, + "content": "We propose Visio-Linguistic Neural Module Network (VilNMN) for video-grounded language tasks.", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 282, + 506, + 296 + ], + "spans": [ + { + "bbox": [ + 105, + 282, + 506, + 296 + ], + "score": 1.0, + "content": "VilNMN leverages entity-based dialogue representations as inputs to neural operations on spatial", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 294, + 506, + 306 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 506, + 306 + ], + "score": 1.0, + "content": "and temporal-level visual features. Previous approaches exploit question-level and token-level", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 305, + 506, + 317 + ], + "spans": [ + { + "bbox": [ + 105, + 305, + 506, + 317 + ], + "score": 1.0, + "content": "representations to extract question-dependent information from video (Jang et al., 2017; Fan et al.,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 315, + 506, + 328 + ], + "spans": [ + { + "bbox": [ + 106, + 315, + 506, + 328 + ], + "score": 1.0, + "content": "2019; Le et al., 2019b). In complex videos with many entities or actions, these approaches might not", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 326, + 505, + 339 + ], + "spans": [ + { + "bbox": [ + 106, + 326, + 505, + 339 + ], + "score": 1.0, + "content": "be optimal to locate the right features. To exploit object-level features, VilNMN is trained to identify", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 338, + 503, + 350 + ], + "spans": [ + { + "bbox": [ + 105, + 338, + 503, + 350 + ], + "score": 1.0, + "content": "relevant entities first, and then to extract the temporal steps using detected actions of these entities.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 9 + }, + { + "type": "text", + "bbox": [ + 107, + 354, + 505, + 420 + ], + "lines": [ + { + "bbox": [ + 105, + 353, + 505, + 367 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 505, + 367 + ], + "score": 1.0, + "content": "VilNMN is also trained to resolve any co-references in language inputs, e.g. questions in a dialogue", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 365, + 505, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 505, + 378 + ], + "score": 1.0, + "content": "context, to identify the original entities. Previous approaches to video-grounded dialogues often", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 377, + 505, + 388 + ], + "spans": [ + { + "bbox": [ + 106, + 377, + 505, + 388 + ], + "score": 1.0, + "content": "obtain question global representations in relation to dialogue context. These approaches might be", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 387, + 506, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 387, + 506, + 399 + ], + "score": 1.0, + "content": "suitable to represent general semantics in open-domain or chit-chat dialogues (Serban et al., 2016;", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 397, + 505, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 397, + 505, + 411 + ], + "score": 1.0, + "content": "Li et al., 2016) but they are not ideal to detect fine-grained entity-based information as the dialogue", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 410, + 212, + 420 + ], + "spans": [ + { + "bbox": [ + 106, + 410, + 212, + 420 + ], + "score": 1.0, + "content": "context evolves over time.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 15.5 + }, + { + "type": "text", + "bbox": [ + 107, + 426, + 505, + 525 + ], + "lines": [ + { + "bbox": [ + 106, + 426, + 505, + 439 + ], + "spans": [ + { + "bbox": [ + 106, + 426, + 505, + 439 + ], + "score": 1.0, + "content": "In summary, we introduce a neural module network approach to video-grounded language tasks", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 436, + 505, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 436, + 505, + 450 + ], + "score": 1.0, + "content": "through a reasoning pipeline with entity and action representations applied on the spatio-temporal", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 448, + 505, + 461 + ], + "spans": [ + { + "bbox": [ + 106, + 448, + 505, + 461 + ], + "score": 1.0, + "content": "dynamics of video. To cater to complex semantic inputs in language inputs, e.g. dialogues, our", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 459, + 506, + 472 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 506, + 472 + ], + "score": 1.0, + "content": "approach also allows models to resolve entity references to incorporate question representations", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 470, + 505, + 482 + ], + "spans": [ + { + "bbox": [ + 106, + 470, + 505, + 482 + ], + "score": 1.0, + "content": "with fine-grained entity information. In our evaluation, we achieve competitive performance on the", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 481, + 505, + 493 + ], + "spans": [ + { + "bbox": [ + 105, + 481, + 505, + 493 + ], + "score": 1.0, + "content": "large-scale benchmark Audio-visual Scene-aware Dialogues (AVSD) (Alamri et al., 2019). We also", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 106, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "adapt VilNMN for video QA and obtain the state-of-the-art on the TGIF-QA benchmark (Jang et al.,", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 501, + 505, + 517 + ], + "spans": [ + { + "bbox": [ + 105, + 501, + 505, + 517 + ], + "score": 1.0, + "content": "2017) across all tasks. Our experiments and ablation analysis indicate a potential direction to develop", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 513, + 437, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 513, + 437, + 528 + ], + "score": 1.0, + "content": "compositional and interpretable neural models for video-grounded language tasks.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 23 + }, + { + "type": "title", + "bbox": [ + 108, + 541, + 211, + 554 + ], + "lines": [ + { + "bbox": [ + 104, + 540, + 213, + 557 + ], + "spans": [ + { + "bbox": [ + 104, + 540, + 213, + 557 + ], + "score": 1.0, + "content": "2 RELATED WORK", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 567, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 106, + 567, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 106, + 567, + 505, + 579 + ], + "score": 1.0, + "content": "Video QA has been a proxy for evaluating a model’s understanding capability of language and video", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 577, + 506, + 592 + ], + "spans": [ + { + "bbox": [ + 105, + 577, + 506, + 592 + ], + "score": 1.0, + "content": "and the task is treated as a visual information retrieval task. Jang et al. (2017); Gao et al. (2018);", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 588, + 505, + 602 + ], + "spans": [ + { + "bbox": [ + 105, + 588, + 505, + 602 + ], + "score": 1.0, + "content": "Jiang et al. (2020) propose to learn attention guided by question global representation to retrieve", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 600, + 506, + 614 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 506, + 614 + ], + "score": 1.0, + "content": "spatial-level and temporal-level visual features. Li et al. (2019); Fan et al. (2019); Jiang & Han (2020)", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 610, + 506, + 624 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 506, + 624 + ], + "score": 1.0, + "content": "model interaction between all pairs of question token-level representations and temporal-level features", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 622, + 506, + 635 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 506, + 635 + ], + "score": 1.0, + "content": "of input video. Extended from video QA, video-grounded dialogue is an emerging task that combines", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 632, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 506, + 646 + ], + "score": 1.0, + "content": "dialogue response generation and video-language understanding research. Nguyen et al. (2018); Hori", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 104, + 643, + 506, + 657 + ], + "spans": [ + { + "bbox": [ + 104, + 643, + 506, + 657 + ], + "score": 1.0, + "content": "et al. (2019); Hori et al. (2019); Sanabria et al. (2019); Le et al. (2019a;b) extend traditional QA", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 655, + 506, + 667 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 506, + 667 + ], + "score": 1.0, + "content": "models by adding dialogue history neural encoders. Kumar et al. (2019) enhances dialogue features", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 666, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 106, + 666, + 506, + 678 + ], + "score": 1.0, + "content": "with topic-level representations to express the general topic in each dialogue. Sanabria et al. (2019)", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 677, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 690 + ], + "score": 1.0, + "content": "considers the task as a video summary task and concatenates question and dialogue history into a", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 688, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 688, + 506, + 700 + ], + "score": 1.0, + "content": "single sequence and proposes to transfer parameter weights from a large-scale video summary model.", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "score": 1.0, + "content": "Different from prior work, we dissect the question sequence and explicitly detect and decode any", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 711, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 711, + 505, + 722 + ], + "score": 1.0, + "content": "entities and their references. Our models also benefit from the additional insights on how models", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 721, + 414, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 414, + 733 + ], + "score": 1.0, + "content": "learn to use component linguistic inputs for extraction of visual information.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 36 + } + ], + "page_idx": 1, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 108, + 27, + 306, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 309, + 760 + ], + "lines": [ + { + "bbox": [ + 301, + 750, + 310, + 763 + ], + "spans": [ + { + "bbox": [ + 301, + 750, + 310, + 763 + ], + "score": 1.0, + "content": "2", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "image", + "bbox": [ + 110, + 80, + 502, + 210 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 80, + 502, + 210 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 80, + 502, + 210 + ], + "spans": [ + { + "bbox": [ + 110, + 80, + 502, + 210 + ], + "score": 0.972, + "type": "image", + "image_path": "08dfa3054943d0f06eb58bf4e0e2e48e82ee934f1926997c0219cf2c8c6783ea.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 110, + 80, + 502, + 123.33333333333334 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 110, + 123.33333333333334, + 502, + 166.66666666666669 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 110, + 166.66666666666669, + 502, + 210.00000000000003 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 219, + 506, + 250 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 219, + 506, + 231 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 506, + 231 + ], + "score": 1.0, + "content": "Figure 1: A sample video-grounded dialogue: Inputs are question, dialogue history, video with caption, visual", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 230, + 505, + 240 + ], + "spans": [ + { + "bbox": [ + 106, + 230, + 505, + 240 + ], + "score": 1.0, + "content": "and audio input, and the output is the answer to the question. On the right side, we demonstrate an example", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 239, + 492, + 251 + ], + "spans": [ + { + "bbox": [ + 106, + 239, + 492, + 251 + ], + "score": 1.0, + "content": "symbolic reasoning process a dialogue agent can perform to extract textual and visual clues for the answer.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4 + } + ], + "index": 2.5 + }, + { + "type": "text", + "bbox": [ + 106, + 271, + 505, + 349 + ], + "lines": [ + { + "bbox": [ + 105, + 271, + 506, + 285 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 506, + 285 + ], + "score": 1.0, + "content": "We propose Visio-Linguistic Neural Module Network (VilNMN) for video-grounded language tasks.", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 282, + 506, + 296 + ], + "spans": [ + { + "bbox": [ + 105, + 282, + 506, + 296 + ], + "score": 1.0, + "content": "VilNMN leverages entity-based dialogue representations as inputs to neural operations on spatial", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 294, + 506, + 306 + ], + "spans": [ + { + "bbox": [ + 105, + 294, + 506, + 306 + ], + "score": 1.0, + "content": "and temporal-level visual features. Previous approaches exploit question-level and token-level", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 305, + 506, + 317 + ], + "spans": [ + { + "bbox": [ + 105, + 305, + 506, + 317 + ], + "score": 1.0, + "content": "representations to extract question-dependent information from video (Jang et al., 2017; Fan et al.,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 315, + 506, + 328 + ], + "spans": [ + { + "bbox": [ + 106, + 315, + 506, + 328 + ], + "score": 1.0, + "content": "2019; Le et al., 2019b). In complex videos with many entities or actions, these approaches might not", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 326, + 505, + 339 + ], + "spans": [ + { + "bbox": [ + 106, + 326, + 505, + 339 + ], + "score": 1.0, + "content": "be optimal to locate the right features. To exploit object-level features, VilNMN is trained to identify", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 338, + 503, + 350 + ], + "spans": [ + { + "bbox": [ + 105, + 338, + 503, + 350 + ], + "score": 1.0, + "content": "relevant entities first, and then to extract the temporal steps using detected actions of these entities.", + "type": "text" + } + ], + "index": 12 + } + ], + "index": 9, + "bbox_fs": [ + 105, + 271, + 506, + 350 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 354, + 505, + 420 + ], + "lines": [ + { + "bbox": [ + 105, + 353, + 505, + 367 + ], + "spans": [ + { + "bbox": [ + 105, + 353, + 505, + 367 + ], + "score": 1.0, + "content": "VilNMN is also trained to resolve any co-references in language inputs, e.g. questions in a dialogue", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 365, + 505, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 505, + 378 + ], + "score": 1.0, + "content": "context, to identify the original entities. Previous approaches to video-grounded dialogues often", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 377, + 505, + 388 + ], + "spans": [ + { + "bbox": [ + 106, + 377, + 505, + 388 + ], + "score": 1.0, + "content": "obtain question global representations in relation to dialogue context. These approaches might be", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 387, + 506, + 399 + ], + "spans": [ + { + "bbox": [ + 105, + 387, + 506, + 399 + ], + "score": 1.0, + "content": "suitable to represent general semantics in open-domain or chit-chat dialogues (Serban et al., 2016;", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 397, + 505, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 397, + 505, + 411 + ], + "score": 1.0, + "content": "Li et al., 2016) but they are not ideal to detect fine-grained entity-based information as the dialogue", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 410, + 212, + 420 + ], + "spans": [ + { + "bbox": [ + 106, + 410, + 212, + 420 + ], + "score": 1.0, + "content": "context evolves over time.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 15.5, + "bbox_fs": [ + 105, + 353, + 506, + 420 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 426, + 505, + 525 + ], + "lines": [ + { + "bbox": [ + 106, + 426, + 505, + 439 + ], + "spans": [ + { + "bbox": [ + 106, + 426, + 505, + 439 + ], + "score": 1.0, + "content": "In summary, we introduce a neural module network approach to video-grounded language tasks", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 436, + 505, + 450 + ], + "spans": [ + { + "bbox": [ + 105, + 436, + 505, + 450 + ], + "score": 1.0, + "content": "through a reasoning pipeline with entity and action representations applied on the spatio-temporal", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 106, + 448, + 505, + 461 + ], + "spans": [ + { + "bbox": [ + 106, + 448, + 505, + 461 + ], + "score": 1.0, + "content": "dynamics of video. To cater to complex semantic inputs in language inputs, e.g. dialogues, our", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 459, + 506, + 472 + ], + "spans": [ + { + "bbox": [ + 105, + 459, + 506, + 472 + ], + "score": 1.0, + "content": "approach also allows models to resolve entity references to incorporate question representations", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 470, + 505, + 482 + ], + "spans": [ + { + "bbox": [ + 106, + 470, + 505, + 482 + ], + "score": 1.0, + "content": "with fine-grained entity information. In our evaluation, we achieve competitive performance on the", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 481, + 505, + 493 + ], + "spans": [ + { + "bbox": [ + 105, + 481, + 505, + 493 + ], + "score": 1.0, + "content": "large-scale benchmark Audio-visual Scene-aware Dialogues (AVSD) (Alamri et al., 2019). We also", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 106, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "adapt VilNMN for video QA and obtain the state-of-the-art on the TGIF-QA benchmark (Jang et al.,", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 501, + 505, + 517 + ], + "spans": [ + { + "bbox": [ + 105, + 501, + 505, + 517 + ], + "score": 1.0, + "content": "2017) across all tasks. Our experiments and ablation analysis indicate a potential direction to develop", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 513, + 437, + 528 + ], + "spans": [ + { + "bbox": [ + 105, + 513, + 437, + 528 + ], + "score": 1.0, + "content": "compositional and interpretable neural models for video-grounded language tasks.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 23, + "bbox_fs": [ + 105, + 426, + 506, + 528 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 541, + 211, + 554 + ], + "lines": [ + { + "bbox": [ + 104, + 540, + 213, + 557 + ], + "spans": [ + { + "bbox": [ + 104, + 540, + 213, + 557 + ], + "score": 1.0, + "content": "2 RELATED WORK", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 567, + 505, + 731 + ], + "lines": [ + { + "bbox": [ + 106, + 567, + 505, + 579 + ], + "spans": [ + { + "bbox": [ + 106, + 567, + 505, + 579 + ], + "score": 1.0, + "content": "Video QA has been a proxy for evaluating a model’s understanding capability of language and video", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 577, + 506, + 592 + ], + "spans": [ + { + "bbox": [ + 105, + 577, + 506, + 592 + ], + "score": 1.0, + "content": "and the task is treated as a visual information retrieval task. Jang et al. (2017); Gao et al. (2018);", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 588, + 505, + 602 + ], + "spans": [ + { + "bbox": [ + 105, + 588, + 505, + 602 + ], + "score": 1.0, + "content": "Jiang et al. (2020) propose to learn attention guided by question global representation to retrieve", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 600, + 506, + 614 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 506, + 614 + ], + "score": 1.0, + "content": "spatial-level and temporal-level visual features. Li et al. (2019); Fan et al. (2019); Jiang & Han (2020)", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 610, + 506, + 624 + ], + "spans": [ + { + "bbox": [ + 105, + 610, + 506, + 624 + ], + "score": 1.0, + "content": "model interaction between all pairs of question token-level representations and temporal-level features", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 622, + 506, + 635 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 506, + 635 + ], + "score": 1.0, + "content": "of input video. Extended from video QA, video-grounded dialogue is an emerging task that combines", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 632, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 105, + 632, + 506, + 646 + ], + "score": 1.0, + "content": "dialogue response generation and video-language understanding research. Nguyen et al. (2018); Hori", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 104, + 643, + 506, + 657 + ], + "spans": [ + { + "bbox": [ + 104, + 643, + 506, + 657 + ], + "score": 1.0, + "content": "et al. (2019); Hori et al. (2019); Sanabria et al. (2019); Le et al. (2019a;b) extend traditional QA", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 655, + 506, + 667 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 506, + 667 + ], + "score": 1.0, + "content": "models by adding dialogue history neural encoders. Kumar et al. (2019) enhances dialogue features", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 666, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 106, + 666, + 506, + 678 + ], + "score": 1.0, + "content": "with topic-level representations to express the general topic in each dialogue. Sanabria et al. (2019)", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 677, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 690 + ], + "score": 1.0, + "content": "considers the task as a video summary task and concatenates question and dialogue history into a", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 688, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 106, + 688, + 506, + 700 + ], + "score": 1.0, + "content": "single sequence and proposes to transfer parameter weights from a large-scale video summary model.", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 698, + 506, + 712 + ], + "score": 1.0, + "content": "Different from prior work, we dissect the question sequence and explicitly detect and decode any", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 711, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 711, + 505, + 722 + ], + "score": 1.0, + "content": "entities and their references. Our models also benefit from the additional insights on how models", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 721, + 414, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 414, + 733 + ], + "score": 1.0, + "content": "learn to use component linguistic inputs for extraction of visual information.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 36, + "bbox_fs": [ + 104, + 567, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 107, + 80, + 505, + 196 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 107, + 80, + 505, + 196 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 107, + 80, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 107, + 80, + 505, + 196 + ], + "score": 0.969, + "type": "image", + "image_path": "c1042d57aa0064953fc1ccfac4878bbe8349871223ee844ed91ddeaf1edb3ed5.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 107, + 80, + 505, + 118.66666666666666 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 107, + 118.66666666666666, + 505, + 157.33333333333331 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 107, + 157.33333333333331, + 505, + 195.99999999999997 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 204, + 505, + 254 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 203, + 506, + 216 + ], + "spans": [ + { + "bbox": [ + 105, + 203, + 506, + 216 + ], + "score": 1.0, + "content": "Figure 2: VilNMN includes 4 major components: (1) encoders that encode dialogue and video components", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 214, + 505, + 225 + ], + "spans": [ + { + "bbox": [ + 106, + 214, + 505, + 225 + ], + "score": 1.0, + "content": "into continuous vector representations; (2) question parsers that parse question of the current dialogue turn into", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 223, + 506, + 236 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 506, + 236 + ], + "score": 1.0, + "content": "compositional programs for dialogue and video understanding; (3) an inventory of neural modules that operate", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 233, + 506, + 246 + ], + "spans": [ + { + "bbox": [ + 105, + 233, + 506, + 246 + ], + "score": 1.0, + "content": "on dialogue and video input components; and (4) a response decoder that generates natural language sequence", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 243, + 314, + 257 + ], + "spans": [ + { + "bbox": [ + 105, + 243, + 314, + 257 + ], + "score": 1.0, + "content": "using dialogue-based and video-based execution outputs.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5 + } + ], + "index": 3.0 + }, + { + "type": "text", + "bbox": [ + 106, + 288, + 506, + 476 + ], + "lines": [ + { + "bbox": [ + 106, + 288, + 506, + 301 + ], + "spans": [ + { + "bbox": [ + 106, + 288, + 506, + 301 + ], + "score": 1.0, + "content": "Extending from the line of research on neural semantic parsing (Jia & Liang, 2016; Liang et al.,", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 106, + 299, + 506, + 312 + ], + "spans": [ + { + "bbox": [ + 106, + 299, + 506, + 312 + ], + "score": 1.0, + "content": "2017), Andreas et al. (2016b;a) introduce NMNs to address visual QA by decomposing questions", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 311, + 506, + 324 + ], + "spans": [ + { + "bbox": [ + 106, + 311, + 506, + 324 + ], + "score": 1.0, + "content": "into linguistic sub-structures, known as programs, to instantiate a network of neural modules. NMN", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 321, + 506, + 335 + ], + "spans": [ + { + "bbox": [ + 105, + 321, + 506, + 335 + ], + "score": 1.0, + "content": "models have achieved significant success in synthetic image domains where complex reasoning", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 333, + 506, + 345 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 506, + 345 + ], + "score": 1.0, + "content": "process is required (Johnson et al., 2017b; Hu et al., 2018; Han et al., 2019). Our work is related to the", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 343, + 506, + 356 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 506, + 356 + ], + "score": 1.0, + "content": "recent work that extends NMN models to real data domains. For instance, Kottur et al. (2018); Jiang &", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 355, + 506, + 366 + ], + "spans": [ + { + "bbox": [ + 106, + 355, + 506, + 366 + ], + "score": 1.0, + "content": "Bansal (2019); Gupta et al. (2020) extend NMNs to visual dialogues and reading comprehension tasks.", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 365, + 506, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 506, + 378 + ], + "score": 1.0, + "content": "In this paper, we introduce a new approach that exploits NMN to learn dependencies between the", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 376, + 506, + 390 + ], + "spans": [ + { + "bbox": [ + 105, + 376, + 506, + 390 + ], + "score": 1.0, + "content": "lexical composition in language inputs and the spatio-temporal dynamics in videos. This is not present", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 387, + 506, + 400 + ], + "spans": [ + { + "bbox": [ + 105, + 387, + 506, + 400 + ], + "score": 1.0, + "content": "in prior NMN models which are designed to apply on a two-dimensional image input without temporal", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 398, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 398, + 506, + 411 + ], + "score": 1.0, + "content": "variance. In video represented as sequence of images, each represented by object-level features,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 408, + 506, + 423 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 506, + 423 + ], + "score": 1.0, + "content": "applying prior NMN models require aggregating frame-level features, e.g. through average pooling,", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 420, + 506, + 432 + ], + "spans": [ + { + "bbox": [ + 105, + 420, + 506, + 432 + ], + "score": 1.0, + "content": "resulting in potential loss of information. An alternative solution is a late-fusion method in which", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 429, + 506, + 444 + ], + "spans": [ + { + "bbox": [ + 105, + 429, + 506, + 444 + ], + "score": 1.0, + "content": "an NMN model performs reasoning structure programs on sampled video frames only. An object", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 442, + 506, + 455 + ], + "spans": [ + { + "bbox": [ + 106, + 442, + 506, + 455 + ], + "score": 1.0, + "content": "tracking mechanism or attention mechanism is then used to fuse the output representations. Instead,", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 453, + 505, + 466 + ], + "spans": [ + { + "bbox": [ + 105, + 453, + 505, + 466 + ], + "score": 1.0, + "content": "we propose to construct a reasoning structure with multi-step interaction between the space-time", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 464, + 329, + 477 + ], + "spans": [ + { + "bbox": [ + 105, + 464, + 329, + 477 + ], + "score": 1.0, + "content": "information in video with entity-action detected in text.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 16 + }, + { + "type": "title", + "bbox": [ + 107, + 505, + 172, + 518 + ], + "lines": [ + { + "bbox": [ + 104, + 503, + 174, + 521 + ], + "spans": [ + { + "bbox": [ + 104, + 503, + 174, + 521 + ], + "score": 1.0, + "content": "3 METHOD", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 539, + 505, + 616 + ], + "lines": [ + { + "bbox": [ + 104, + 538, + 506, + 552 + ], + "spans": [ + { + "bbox": [ + 104, + 538, + 506, + 552 + ], + "score": 1.0, + "content": "In this section, we present the design of our model, called Visio-Linguistic Neural Module Networks", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "score": 1.0, + "content": "(VilNMN). An overview of the model can be seen in Figure 2. The input to the model consists of a", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 143, + 574 + ], + "score": 1.0, + "content": "dialogue", + "type": "text" + }, + { + "bbox": [ + 144, + 562, + 153, + 571 + ], + "score": 0.8, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 560, + 275, + 574 + ], + "score": 1.0, + "content": "which is grounded on a video", + "type": "text" + }, + { + "bbox": [ + 275, + 562, + 283, + 571 + ], + "score": 0.61, + "content": "\\nu", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 560, + 505, + 574 + ], + "score": 1.0, + "content": ". The input components include the question of current", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 572, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 106, + 572, + 161, + 585 + ], + "score": 1.0, + "content": "dialogue turn", + "type": "text" + }, + { + "bbox": [ + 161, + 573, + 170, + 583 + ], + "score": 0.77, + "content": "\\mathcal { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 572, + 239, + 585 + ], + "score": 1.0, + "content": ", dialogue history", + "type": "text" + }, + { + "bbox": [ + 239, + 573, + 249, + 582 + ], + "score": 0.81, + "content": "\\mathcal { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 572, + 506, + 585 + ], + "score": 1.0, + "content": ", and the features of input video, including visual and audio input.", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 289, + 596 + ], + "score": 1.0, + "content": "The output is a dialogue response, denoted as", + "type": "text" + }, + { + "bbox": [ + 289, + 583, + 299, + 593 + ], + "score": 0.76, + "content": "\\mathcal { R }", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 582, + 506, + 596 + ], + "score": 1.0, + "content": ". 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(2017a); Hu et al. (2017) and consider", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "score": 1.0, + "content": "program generation as a sequence-to-sequence task. Different from prior approaches, our models are", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 644, + 504, + 656 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 504, + 656 + ], + "score": 1.0, + "content": "trained to fully generate the parameters of component modules in text. This approach is appropriate", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 655, + 504, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 504, + 668 + ], + "score": 1.0, + "content": "as reasoning programs in real data domains such as current video-grounded dialogues are usually", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 665, + 506, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 679 + ], + "score": 1.0, + "content": "shorter than those for synthetic data (Johnson et al., 2017a) and thus, program generation takes", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "less computational cost. 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(2016b;a) introduce NMNs to address visual QA by decomposing questions", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 106, + 311, + 506, + 324 + ], + "spans": [ + { + "bbox": [ + 106, + 311, + 506, + 324 + ], + "score": 1.0, + "content": "into linguistic sub-structures, known as programs, to instantiate a network of neural modules. NMN", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 321, + 506, + 335 + ], + "spans": [ + { + "bbox": [ + 105, + 321, + 506, + 335 + ], + "score": 1.0, + "content": "models have achieved significant success in synthetic image domains where complex reasoning", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 333, + 506, + 345 + ], + "spans": [ + { + "bbox": [ + 105, + 333, + 506, + 345 + ], + "score": 1.0, + "content": "process is required (Johnson et al., 2017b; Hu et al., 2018; Han et al., 2019). Our work is related to the", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 343, + 506, + 356 + ], + "spans": [ + { + "bbox": [ + 105, + 343, + 506, + 356 + ], + "score": 1.0, + "content": "recent work that extends NMN models to real data domains. For instance, Kottur et al. (2018); Jiang &", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 355, + 506, + 366 + ], + "spans": [ + { + "bbox": [ + 106, + 355, + 506, + 366 + ], + "score": 1.0, + "content": "Bansal (2019); Gupta et al. (2020) extend NMNs to visual dialogues and reading comprehension tasks.", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 365, + 506, + 378 + ], + "spans": [ + { + "bbox": [ + 105, + 365, + 506, + 378 + ], + "score": 1.0, + "content": "In this paper, we introduce a new approach that exploits NMN to learn dependencies between the", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 376, + 506, + 390 + ], + "spans": [ + { + "bbox": [ + 105, + 376, + 506, + 390 + ], + "score": 1.0, + "content": "lexical composition in language inputs and the spatio-temporal dynamics in videos. This is not present", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 387, + 506, + 400 + ], + "spans": [ + { + "bbox": [ + 105, + 387, + 506, + 400 + ], + "score": 1.0, + "content": "in prior NMN models which are designed to apply on a two-dimensional image input without temporal", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 398, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 398, + 506, + 411 + ], + "score": 1.0, + "content": "variance. In video represented as sequence of images, each represented by object-level features,", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 408, + 506, + 423 + ], + "spans": [ + { + "bbox": [ + 105, + 408, + 506, + 423 + ], + "score": 1.0, + "content": "applying prior NMN models require aggregating frame-level features, e.g. through average pooling,", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 420, + 506, + 432 + ], + "spans": [ + { + "bbox": [ + 105, + 420, + 506, + 432 + ], + "score": 1.0, + "content": "resulting in potential loss of information. An alternative solution is a late-fusion method in which", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 429, + 506, + 444 + ], + "spans": [ + { + "bbox": [ + 105, + 429, + 506, + 444 + ], + "score": 1.0, + "content": "an NMN model performs reasoning structure programs on sampled video frames only. An object", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 442, + 506, + 455 + ], + "spans": [ + { + "bbox": [ + 106, + 442, + 506, + 455 + ], + "score": 1.0, + "content": "tracking mechanism or attention mechanism is then used to fuse the output representations. Instead,", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 453, + 505, + 466 + ], + "spans": [ + { + "bbox": [ + 105, + 453, + 505, + 466 + ], + "score": 1.0, + "content": "we propose to construct a reasoning structure with multi-step interaction between the space-time", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 464, + 329, + 477 + ], + "spans": [ + { + "bbox": [ + 105, + 464, + 329, + 477 + ], + "score": 1.0, + "content": "information in video with entity-action detected in text.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 16, + "bbox_fs": [ + 105, + 288, + 506, + 477 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 505, + 172, + 518 + ], + "lines": [ + { + "bbox": [ + 104, + 503, + 174, + 521 + ], + "spans": [ + { + "bbox": [ + 104, + 503, + 174, + 521 + ], + "score": 1.0, + "content": "3 METHOD", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 539, + 505, + 616 + ], + "lines": [ + { + "bbox": [ + 104, + 538, + 506, + 552 + ], + "spans": [ + { + "bbox": [ + 104, + 538, + 506, + 552 + ], + "score": 1.0, + "content": "In this section, we present the design of our model, called Visio-Linguistic Neural Module Networks", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "score": 1.0, + "content": "(VilNMN). An overview of the model can be seen in Figure 2. The input to the model consists of a", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 560, + 505, + 574 + ], + "spans": [ + { + "bbox": [ + 105, + 560, + 143, + 574 + ], + "score": 1.0, + "content": "dialogue", + "type": "text" + }, + { + "bbox": [ + 144, + 562, + 153, + 571 + ], + "score": 0.8, + "content": "\\mathcal { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 154, + 560, + 275, + 574 + ], + "score": 1.0, + "content": "which is grounded on a video", + "type": "text" + }, + { + "bbox": [ + 275, + 562, + 283, + 571 + ], + "score": 0.61, + "content": "\\nu", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 560, + 505, + 574 + ], + "score": 1.0, + "content": ". The input components include the question of current", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 572, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 106, + 572, + 161, + 585 + ], + "score": 1.0, + "content": "dialogue turn", + "type": "text" + }, + { + "bbox": [ + 161, + 573, + 170, + 583 + ], + "score": 0.77, + "content": "\\mathcal { Q }", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 572, + 239, + 585 + ], + "score": 1.0, + "content": ", dialogue history", + "type": "text" + }, + { + "bbox": [ + 239, + 573, + 249, + 582 + ], + "score": 0.81, + "content": "\\mathcal { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 572, + 506, + 585 + ], + "score": 1.0, + "content": ", and the features of input video, including visual and audio input.", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 289, + 596 + ], + "score": 1.0, + "content": "The output is a dialogue response, denoted as", + "type": "text" + }, + { + "bbox": [ + 289, + 583, + 299, + 593 + ], + "score": 0.76, + "content": "\\mathcal { R }", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 582, + 506, + 596 + ], + "score": 1.0, + "content": ". Each text input component is a sequence of words", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 592, + 507, + 609 + ], + "spans": [ + { + "bbox": [ + 107, + 594, + 180, + 605 + ], + "score": 0.9, + "content": "w _ { 1 } , . . . , \\bar { w } _ { m } \\in \\mathbb { V } ^ { i n }", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 592, + 397, + 609 + ], + "score": 1.0, + "content": ", the input vocabulary. 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(2017a); Hu et al. (2017) and consider", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 105, + 633, + 505, + 645 + ], + "score": 1.0, + "content": "program generation as a sequence-to-sequence task. Different from prior approaches, our models are", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 644, + 504, + 656 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 504, + 656 + ], + "score": 1.0, + "content": "trained to fully generate the parameters of component modules in text. 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We adopt a simple template", + "type": "text" + }, + { + "bbox": [ + 291, + 699, + 468, + 711 + ], + "score": 0.89, + "content": "\\mathrm { \\langle \\langle p a r a m _ { 1 } \\rangle \\langle m o d u l e _ { 1 } \\rangle \\langle p a r a m _ { 2 } \\rangle \\langle m o d u l e _ { 2 } \\rangle . }", + "type": "inline_equation" + }, + { + "bbox": [ + 469, + 699, + 505, + 712 + ], + "score": 1.0, + "content": ".” as the", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 710, + 505, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 505, + 723 + ], + "score": 1.0, + "content": "target sequence. 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We denote", + "type": "text" + }, + { + "bbox": [ + 368, + 81, + 376, + 90 + ], + "score": 0.8, + "content": "P", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 81, + 505, + 91 + ], + "score": 1.0, + "content": "as the parameter to instantiate each", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 89, + 481, + 102 + ], + "spans": [ + { + "bbox": [ + 105, + 89, + 138, + 102 + ], + "score": 1.0, + "content": "module,", + "type": "text" + }, + { + "bbox": [ + 138, + 91, + 147, + 99 + ], + "score": 0.7, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 148, + 89, + 233, + 102 + ], + "score": 1.0, + "content": "as the dialogue history,", + "type": "text" + }, + { + "bbox": [ + 234, + 91, + 242, + 101 + ], + "score": 0.84, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 242, + 89, + 416, + 102 + ], + "score": 1.0, + "content": "as the question of the current dialogue turn, and", + "type": "text" + }, + { + "bbox": [ + 416, + 91, + 425, + 99 + ], + "score": 0.73, + "content": "V", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 89, + 481, + 102 + ], + "score": 1.0, + "content": "as video input.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "table_body", + "bbox": [ + 108, + 109, + 502, + 171 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 108, + 109, + 502, + 171 + ], + "spans": [ + { + "bbox": [ + 108, + 109, + 502, + 171 + ], + "score": 0.978, + "html": "
ModuleInputOutputDescription
findP,HHentForrelated entities in question,select the relevant tokens from dialogue history
summarizeHent,QQctxBased on contextual entity representations,summarise the question semantics
whereP,VVentSelect the relevant spatial position corresponding to original (resolved) entities
whenP,VentVent+actSelect the relevant entity-aware temporal steps corresponding to the action parameter
describeP,Vent+actVctx VctxSelect visual entity-action features based on non-binary question types
existQ,Vent+actSelect visual entity-action features based on binary (yes/no) question types
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We concatenate each object", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 425, + 506, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 425, + 353, + 438 + ], + "score": 1.0, + "content": "representation with the corresponding coordinates projected to", + "type": "text" + }, + { + "bbox": [ + 354, + 426, + 370, + 437 + ], + "score": 0.88, + "content": "d _ { \\mathrm { v i s } }", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 425, + 506, + 438 + ], + "score": 1.0, + "content": "dimensions. We also make use of", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 104, + 435, + 506, + 450 + ], + "spans": [ + { + "bbox": [ + 104, + 435, + 393, + 450 + ], + "score": 1.0, + "content": "a CNN-based pre-trained model to obtain features of temporal dimension", + "type": "text" + }, + { + "bbox": [ + 393, + 436, + 459, + 448 + ], + "score": 0.92, + "content": "Z _ { \\mathrm { c n n } } \\in \\mathbb { R } ^ { F \\times d _ { \\mathrm { v i s } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 435, + 506, + 450 + ], + "score": 1.0, + "content": ". The audio", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 104, + 445, + 507, + 461 + ], + "spans": [ + { + "bbox": [ + 104, + 445, + 317, + 461 + ], + "score": 1.0, + "content": "feature is obtained through a pretrained audio model,", + "type": "text" + }, + { + "bbox": [ + 318, + 447, + 386, + 459 + ], + "score": 0.92, + "content": "\\boldsymbol { Z _ { \\mathrm { a u d } } ^ { \\star } } \\in \\mathbb { R } ^ { F \\times d _ { \\mathrm { a u d } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 445, + 507, + 461 + ], + "score": 1.0, + "content": ". We passed all video features", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 459, + 493, + 471 + ], + "spans": [ + { + "bbox": [ + 106, + 459, + 483, + 471 + ], + "score": 1.0, + "content": "through a linear transformation layer with ReLU activation to the same embedding dimension", + "type": "text" + }, + { + "bbox": [ + 483, + 459, + 489, + 469 + ], + "score": 0.78, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 459, + 493, + 471 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 23.5 + }, + { + "type": "title", + "bbox": [ + 108, + 483, + 214, + 495 + ], + "lines": [ + { + "bbox": [ + 105, + 482, + 216, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 216, + 496 + ], + "score": 1.0, + "content": "3.2 NEURAL MODULES", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 504, + 505, + 559 + ], + "lines": [ + { + "bbox": [ + 106, + 504, + 505, + 516 + ], + "spans": [ + { + "bbox": [ + 106, + 504, + 505, + 516 + ], + "score": 1.0, + "content": "We introduce neural modules that are used to assemble an executable program constructed by the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 514, + 506, + 527 + ], + "spans": [ + { + "bbox": [ + 105, + 514, + 506, + 527 + ], + "score": 1.0, + "content": "generated sequence from question parsers. We provide an overview of neural modules in Table 1 and", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 526, + 506, + 538 + ], + "spans": [ + { + "bbox": [ + 106, + 526, + 506, + 538 + ], + "score": 1.0, + "content": "demonstrate dialogue understanding and video understanding modules in Figure 3 and 4 respectively.", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 536, + 506, + 550 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 506, + 550 + ], + "score": 1.0, + "content": "Each module parameter, e.g. “a backpack”, is extracted from the parsed program. 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This module handles entity tracing by obtaining a distribution over tokens in", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 574, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 505, + 589 + ], + "score": 1.0, + "content": "dialogue history. We use an entity-to-dialogue-history attention mechanism applied from an entity", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 107, + 587, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 107, + 587, + 117, + 598 + ], + "score": 0.86, + "content": "P _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 587, + 505, + 599 + ], + "score": 1.0, + "content": "to all tokens in dialogue history. Any neural network that learn to generate attention between", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 598, + 506, + 610 + ], + "spans": [ + { + "bbox": [ + 105, + 598, + 506, + 610 + ], + "score": 1.0, + "content": "two tensors is applicable .e.g. (Bahdanau et al., 2015; Vaswani et al., 2017). The attention matrix", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 606, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 104, + 606, + 207, + 622 + ], + "score": 1.0, + "content": "normalized by softmax,", + "type": "text" + }, + { + "bbox": [ + 207, + 608, + 265, + 621 + ], + "score": 0.93, + "content": "A _ { \\mathrm { f i n d , i } } \\in \\mathbb { R } ^ { L _ { \\mathrm { H } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 606, + 506, + 622 + ], + "score": 1.0, + "content": ", is used to compute the weighted sum of dialogue history", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 620, + 505, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 620, + 386, + 632 + ], + "score": 1.0, + "content": "token representations. The output is combined with entity embedding", + "type": "text" + }, + { + "bbox": [ + 387, + 620, + 397, + 631 + ], + "score": 0.88, + "content": "P _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 620, + 505, + 632 + ], + "score": 1.0, + "content": "to obtain contextual entity", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 630, + 219, + 643 + ], + "spans": [ + { + "bbox": [ + 104, + 631, + 165, + 643 + ], + "score": 1.0, + "content": "representation", + "type": "text" + }, + { + "bbox": [ + 166, + 630, + 215, + 643 + ], + "score": 0.92, + "content": "H _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 631, + 219, + 643 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 37 + }, + { + "type": "text", + "bbox": [ + 107, + 647, + 505, + 704 + ], + "lines": [ + { + "bbox": [ + 105, + 646, + 506, + 661 + ], + "spans": [ + { + "bbox": [ + 105, + 646, + 164, + 661 + ], + "score": 1.0, + "content": "summarize", + "type": "text" + }, + { + "bbox": [ + 164, + 648, + 230, + 659 + ], + "score": 0.9, + "content": "( \\mathbf { \\delta H } _ { \\mathrm { e n t } } , \\mathbf { \\delta Q } ) \\to \\mathbf { \\delta Q } _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 646, + 403, + 661 + ], + "score": 1.0, + "content": ". For each contextual entity representation", + "type": "text" + }, + { + "bbox": [ + 404, + 648, + 429, + 660 + ], + "score": 0.85, + "content": "H _ { \\mathrm { e n t , i } }", + "type": "inline_equation" + }, + { + "bbox": [ + 429, + 646, + 433, + 661 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 433, + 648, + 493, + 659 + ], + "score": 0.9, + "content": "i = 1 , . . . , N _ { \\mathrm { e n t } }", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 646, + 506, + 661 + ], + "score": 1.0, + "content": ", it", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 657, + 507, + 672 + ], + "spans": [ + { + "bbox": [ + 105, + 657, + 166, + 672 + ], + "score": 1.0, + "content": "is projected to", + "type": "text" + }, + { + "bbox": [ + 167, + 659, + 181, + 671 + ], + "score": 0.88, + "content": "L _ { \\mathrm { Q } }", + "type": "inline_equation" + }, + { + "bbox": [ + 182, + 657, + 507, + 672 + ], + "score": 1.0, + "content": "dimensions and is combined with question token embeddings through element-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 104, + 668, + 507, + 685 + ], + "spans": [ + { + "bbox": [ + 104, + 668, + 371, + 685 + ], + "score": 1.0, + "content": "wise summation to obtain entity-aware question representation", + "type": "text" + }, + { + "bbox": [ + 371, + 670, + 442, + 683 + ], + "score": 0.92, + "content": "Q _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { L _ { \\mathrm { Q } } \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 668, + 507, + 685 + ], + "score": 1.0, + "content": ". It is fed to a", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 681, + 506, + 695 + ], + "spans": [ + { + "bbox": [ + 105, + 681, + 506, + 695 + ], + "score": 1.0, + "content": "one-dimensional CNN with max pooling layer (Kim, 2014) to obtain a contextual entity-aware", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 692, + 394, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 692, + 323, + 705 + ], + "score": 1.0, + "content": "question representation. 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We denote", + "type": "text" + }, + { + "bbox": [ + 368, + 81, + 376, + 90 + ], + "score": 0.8, + "content": "P", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 81, + 505, + 91 + ], + "score": 1.0, + "content": "as the parameter to instantiate each", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 89, + 481, + 102 + ], + "spans": [ + { + "bbox": [ + 105, + 89, + 138, + 102 + ], + "score": 1.0, + "content": "module,", + "type": "text" + }, + { + "bbox": [ + 138, + 91, + 147, + 99 + ], + "score": 0.7, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 148, + 89, + 233, + 102 + ], + "score": 1.0, + "content": "as the dialogue history,", + "type": "text" + }, + { + "bbox": [ + 234, + 91, + 242, + 101 + ], + "score": 0.84, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 242, + 89, + 416, + 102 + ], + "score": 1.0, + "content": "as the question of the current dialogue turn, and", + "type": "text" + }, + { + "bbox": [ + 416, + 91, + 425, + 99 + ], + "score": 0.73, + "content": "V", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 89, + 481, + 102 + ], + "score": 1.0, + "content": "as video input.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "table_body", + "bbox": [ + 108, + 109, + 502, + 171 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 108, + 109, + 502, + 171 + ], + "spans": [ + { + "bbox": [ + 108, + 109, + 502, + 171 + ], + "score": 0.978, + "html": "
ModuleInputOutputDescription
findP,HHentForrelated entities in question,select the relevant tokens from dialogue history
summarizeHent,QQctxBased on contextual entity representations,summarise the question semantics
whereP,VVentSelect the relevant spatial position corresponding to original (resolved) entities
whenP,VentVent+actSelect the relevant entity-aware temporal steps corresponding to the action parameter
describeP,Vent+actVctx VctxSelect visual entity-action features based on non-binary question types
existQ,Vent+actSelect visual entity-action features based on binary (yes/no) question types
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A text encoder is shared to encode text inputs, including dialogue history, questions,", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 222, + 506, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 356, + 235 + ], + "score": 1.0, + "content": "and captions. The text encoder converts each text sequence", + "type": "text" + }, + { + "bbox": [ + 356, + 223, + 425, + 234 + ], + "score": 0.92, + "content": "\\mathcal { X } = w _ { 1 } , . . . , w _ { m }", + "type": "inline_equation" + }, + { + "bbox": [ + 425, + 222, + 506, + 235 + ], + "score": 1.0, + "content": "into a sequence of", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 231, + 507, + 247 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 159, + 247 + ], + "score": 1.0, + "content": "embeddings", + "type": "text" + }, + { + "bbox": [ + 159, + 233, + 210, + 244 + ], + "score": 0.93, + "content": "\\boldsymbol { X } \\in \\mathbb { R } ^ { m \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 210, + 231, + 507, + 247 + ], + "score": 1.0, + "content": ". 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The encoded dialogue history and question of the current turn are", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 286, + 492, + 301 + ], + "spans": [ + { + "bbox": [ + 104, + 286, + 149, + 301 + ], + "score": 1.0, + "content": "defined as", + "type": "text" + }, + { + "bbox": [ + 149, + 288, + 311, + 300 + ], + "score": 0.91, + "content": "H = \\operatorname { N o r m } ( \\phi ( \\mathcal { H } ) + \\operatorname { P E } ( \\mathcal { H } ) ) \\in \\mathbb { R } ^ { L _ { \\mathrm { H } } \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 311, + 286, + 329, + 301 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 329, + 287, + 488, + 300 + ], + "score": 0.91, + "content": "Q = \\dot { \\mathrm { N o r m } } ( \\dot { \\phi ( \\mathcal { Q } ) } + \\mathrm { P E } ( \\mathcal { Q } ) ) \\in \\mathbb { R } ^ { L _ { \\mathrm { Q } } \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 286, + 492, + 301 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 9.5, + "bbox_fs": [ + 104, + 211, + 507, + 301 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 305, + 505, + 376 + ], + "lines": [ + { + "bbox": [ + 106, + 305, + 505, + 317 + ], + "spans": [ + { + "bbox": [ + 106, + 305, + 505, + 317 + ], + "score": 1.0, + "content": "To decode program and response sequences auto-repressively, a special token “_sos” is concatenated", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 315, + 506, + 329 + ], + "spans": [ + { + "bbox": [ + 106, + 315, + 173, + 329 + ], + "score": 1.0, + "content": "as the first token", + "type": "text" + }, + { + "bbox": [ + 174, + 317, + 186, + 327 + ], + "score": 0.85, + "content": "w _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 187, + 315, + 268, + 329 + ], + "score": 1.0, + "content": ". The decoded token", + "type": "text" + }, + { + "bbox": [ + 268, + 317, + 281, + 327 + ], + "score": 0.86, + "content": "w _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 315, + 361, + 329 + ], + "score": 1.0, + "content": "is then appended to", + "type": "text" + }, + { + "bbox": [ + 362, + 318, + 374, + 327 + ], + "score": 0.86, + "content": "w _ { 0 }", + "type": "inline_equation" + }, + { + "bbox": [ + 375, + 315, + 450, + 329 + ], + "score": 1.0, + "content": "as input to decode", + "type": "text" + }, + { + "bbox": [ + 450, + 317, + 462, + 327 + ], + "score": 0.84, + "content": "w _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 463, + 315, + 506, + 329 + ], + "score": 1.0, + "content": "and so on.", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 326, + 505, + 340 + ], + "spans": [ + { + "bbox": [ + 106, + 326, + 339, + 340 + ], + "score": 1.0, + "content": "Similarly to input source sequences, at decoding time step", + "type": "text" + }, + { + "bbox": [ + 339, + 328, + 345, + 338 + ], + "score": 0.78, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 326, + 505, + 340 + ], + "score": 1.0, + "content": ", the input target sequence is encoded to", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 338, + 506, + 355 + ], + "spans": [ + { + "bbox": [ + 104, + 338, + 343, + 355 + ], + "score": 1.0, + "content": "obtain representations for dialogue understanding program", + "type": "text" + }, + { + "bbox": [ + 343, + 338, + 381, + 352 + ], + "score": 0.94, + "content": "P _ { \\mathrm { d i a l } } | _ { 0 } ^ { j - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 338, + 506, + 355 + ], + "score": 1.0, + "content": ", video understanding program", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 107, + 349, + 507, + 367 + ], + "spans": [ + { + "bbox": [ + 107, + 351, + 142, + 365 + ], + "score": 0.95, + "content": "P _ { \\mathrm { v i d } } | _ { 0 } ^ { j - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 349, + 232, + 367 + ], + "score": 1.0, + "content": ", and system response", + "type": "text" + }, + { + "bbox": [ + 233, + 351, + 258, + 365 + ], + "score": 0.92, + "content": "R | _ { 0 } ^ { j - 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 349, + 507, + 367 + ], + "score": 1.0, + "content": ". We combine vocabulary of input and output sequences and", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 364, + 367, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 364, + 220, + 376 + ], + "score": 1.0, + "content": "share the embedding matrix", + "type": "text" + }, + { + "bbox": [ + 220, + 364, + 269, + 375 + ], + "score": 0.91, + "content": "E \\in \\mathbb { R } ^ { | \\mathbb { V } | \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 364, + 297, + 376 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 297, + 364, + 365, + 375 + ], + "score": 0.91, + "content": "\\mathbb { V } = \\mathbb { V } ^ { i n } \\cap \\mathbb { V } ^ { o u t }", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 364, + 367, + 376 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 16.5, + "bbox_fs": [ + 104, + 305, + 507, + 376 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 381, + 505, + 470 + ], + "lines": [ + { + "bbox": [ + 105, + 381, + 506, + 395 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 395 + ], + "score": 1.0, + "content": "Video Encoder. To encode video input, we use pre-trained models to extract visual features and", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 393, + 506, + 405 + ], + "spans": [ + { + "bbox": [ + 105, + 393, + 217, + 405 + ], + "score": 1.0, + "content": "audio features. We denote", + "type": "text" + }, + { + "bbox": [ + 218, + 393, + 227, + 403 + ], + "score": 0.83, + "content": "F", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 393, + 506, + 405 + ], + "score": 1.0, + "content": "as the sampled video frames or video clips. For object-level visual", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 403, + 505, + 416 + ], + "spans": [ + { + "bbox": [ + 105, + 403, + 187, + 416 + ], + "score": 1.0, + "content": "features, we denote", + "type": "text" + }, + { + "bbox": [ + 187, + 405, + 196, + 414 + ], + "score": 0.8, + "content": "O", + "type": "inline_equation" + }, + { + "bbox": [ + 197, + 403, + 505, + 416 + ], + "score": 1.0, + "content": "as the maximum number of objects considered in each frame. The resulting", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 104, + 412, + 507, + 428 + ], + "spans": [ + { + "bbox": [ + 104, + 412, + 309, + 428 + ], + "score": 1.0, + "content": "output from a pretrained object detection model is", + "type": "text" + }, + { + "bbox": [ + 310, + 414, + 387, + 427 + ], + "score": 0.91, + "content": "Z _ { \\mathrm { o b j } } \\in \\mathbb { R } ^ { F \\times O \\times d _ { \\mathrm { v i s } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 412, + 507, + 428 + ], + "score": 1.0, + "content": ". We concatenate each object", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 425, + 506, + 438 + ], + "spans": [ + { + "bbox": [ + 105, + 425, + 353, + 438 + ], + "score": 1.0, + "content": "representation with the corresponding coordinates projected to", + "type": "text" + }, + { + "bbox": [ + 354, + 426, + 370, + 437 + ], + "score": 0.88, + "content": "d _ { \\mathrm { v i s } }", + "type": "inline_equation" + }, + { + "bbox": [ + 371, + 425, + 506, + 438 + ], + "score": 1.0, + "content": "dimensions. We also make use of", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 104, + 435, + 506, + 450 + ], + "spans": [ + { + "bbox": [ + 104, + 435, + 393, + 450 + ], + "score": 1.0, + "content": "a CNN-based pre-trained model to obtain features of temporal dimension", + "type": "text" + }, + { + "bbox": [ + 393, + 436, + 459, + 448 + ], + "score": 0.92, + "content": "Z _ { \\mathrm { c n n } } \\in \\mathbb { R } ^ { F \\times d _ { \\mathrm { v i s } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 459, + 435, + 506, + 450 + ], + "score": 1.0, + "content": ". The audio", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 104, + 445, + 507, + 461 + ], + "spans": [ + { + "bbox": [ + 104, + 445, + 317, + 461 + ], + "score": 1.0, + "content": "feature is obtained through a pretrained audio model,", + "type": "text" + }, + { + "bbox": [ + 318, + 447, + 386, + 459 + ], + "score": 0.92, + "content": "\\boldsymbol { Z _ { \\mathrm { a u d } } ^ { \\star } } \\in \\mathbb { R } ^ { F \\times d _ { \\mathrm { a u d } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 445, + 507, + 461 + ], + "score": 1.0, + "content": ". We passed all video features", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 459, + 493, + 471 + ], + "spans": [ + { + "bbox": [ + 106, + 459, + 483, + 471 + ], + "score": 1.0, + "content": "through a linear transformation layer with ReLU activation to the same embedding dimension", + "type": "text" + }, + { + "bbox": [ + 483, + 459, + 489, + 469 + ], + "score": 0.78, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 489, + 459, + 493, + 471 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 23.5, + "bbox_fs": [ + 104, + 381, + 507, + 471 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 483, + 214, + 495 + ], + "lines": [ + { + "bbox": [ + 105, + 482, + 216, + 496 + ], + "spans": [ + { + "bbox": [ + 105, + 482, + 216, + 496 + ], + "score": 1.0, + "content": "3.2 NEURAL MODULES", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 28 + }, + { + "type": "text", + "bbox": [ + 107, + 504, + 505, + 559 + ], + "lines": [ + { + "bbox": [ + 106, + 504, + 505, + 516 + ], + "spans": [ + { + "bbox": [ + 106, + 504, + 505, + 516 + ], + "score": 1.0, + "content": "We introduce neural modules that are used to assemble an executable program constructed by the", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 514, + 506, + 527 + ], + "spans": [ + { + "bbox": [ + 105, + 514, + 506, + 527 + ], + "score": 1.0, + "content": "generated sequence from question parsers. We provide an overview of neural modules in Table 1 and", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 526, + 506, + 538 + ], + "spans": [ + { + "bbox": [ + 106, + 526, + 506, + 538 + ], + "score": 1.0, + "content": "demonstrate dialogue understanding and video understanding modules in Figure 3 and 4 respectively.", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 536, + 506, + 550 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 506, + 550 + ], + "score": 1.0, + "content": "Each module parameter, e.g. “a backpack”, is extracted from the parsed program. For each parameter,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 547, + 410, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 149, + 561 + ], + "score": 1.0, + "content": "we denote", + "type": "text" + }, + { + "bbox": [ + 150, + 547, + 182, + 558 + ], + "score": 0.91, + "content": "P \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 183, + 547, + 410, + 561 + ], + "score": 1.0, + "content": "as the average pooling of component token embeddings.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 31, + "bbox_fs": [ + 105, + 504, + 506, + 561 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 565, + 505, + 642 + ], + "lines": [ + { + "bbox": [ + 106, + 565, + 505, + 577 + ], + "spans": [ + { + "bbox": [ + 106, + 565, + 133, + 577 + ], + "score": 1.0, + "content": "find", + "type": "text" + }, + { + "bbox": [ + 133, + 566, + 189, + 576 + ], + "score": 0.89, + "content": "( \\pmb { \\mathbb { P } } , \\pmb { \\mathbb { H } } ) \\to \\pmb { \\mathbb { H } } _ { \\mathrm { e n t } }", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 565, + 505, + 577 + ], + "score": 1.0, + "content": ". This module handles entity tracing by obtaining a distribution over tokens in", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 574, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 505, + 589 + ], + "score": 1.0, + "content": "dialogue history. We use an entity-to-dialogue-history attention mechanism applied from an entity", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 107, + 587, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 107, + 587, + 117, + 598 + ], + "score": 0.86, + "content": "P _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 587, + 505, + 599 + ], + "score": 1.0, + "content": "to all tokens in dialogue history. Any neural network that learn to generate attention between", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 598, + 506, + 610 + ], + "spans": [ + { + "bbox": [ + 105, + 598, + 506, + 610 + ], + "score": 1.0, + "content": "two tensors is applicable .e.g. (Bahdanau et al., 2015; Vaswani et al., 2017). The attention matrix", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 606, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 104, + 606, + 207, + 622 + ], + "score": 1.0, + "content": "normalized by softmax,", + "type": "text" + }, + { + "bbox": [ + 207, + 608, + 265, + 621 + ], + "score": 0.93, + "content": "A _ { \\mathrm { f i n d , i } } \\in \\mathbb { R } ^ { L _ { \\mathrm { H } } }", + "type": "inline_equation" + }, + { + "bbox": [ + 266, + 606, + 506, + 622 + ], + "score": 1.0, + "content": ", is used to compute the weighted sum of dialogue history", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 620, + 505, + 632 + ], + "spans": [ + { + "bbox": [ + 105, + 620, + 386, + 632 + ], + "score": 1.0, + "content": "token representations. The output is combined with entity embedding", + "type": "text" + }, + { + "bbox": [ + 387, + 620, + 397, + 631 + ], + "score": 0.88, + "content": "P _ { i }", + "type": "inline_equation" + }, + { + "bbox": [ + 397, + 620, + 505, + 632 + ], + "score": 1.0, + "content": "to obtain contextual entity", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 630, + 219, + 643 + ], + "spans": [ + { + "bbox": [ + 104, + 631, + 165, + 643 + ], + "score": 1.0, + "content": "representation", + "type": "text" + }, + { + "bbox": [ + 166, + 630, + 215, + 643 + ], + "score": 0.92, + "content": "H _ { \\mathrm { e n t , i } } \\in \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 631, + 219, + 643 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 37, + "bbox_fs": [ + 104, + 565, + 506, + 643 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 647, + 505, + 704 + ], + "lines": [ + { + "bbox": [ + 105, + 646, + 506, + 661 + ], + "spans": [ + { + "bbox": [ + 105, + 646, + 164, + 661 + ], + "score": 1.0, + "content": "summarize", + "type": "text" + }, + { + "bbox": [ + 164, + 648, + 230, + 659 + ], + "score": 0.9, + "content": "( \\mathbf { \\delta H } _ { \\mathrm { e n t } } , \\mathbf { \\delta Q } ) \\to \\mathbf { \\delta Q } _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 646, + 403, + 661 + ], + "score": 1.0, + "content": ". 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It is fed to a", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 681, + 506, + 695 + ], + "spans": [ + { + "bbox": [ + 105, + 681, + 506, + 695 + ], + "score": 1.0, + "content": "one-dimensional CNN with max pooling layer (Kim, 2014) to obtain a contextual entity-aware", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 692, + 394, + 705 + ], + "spans": [ + { + "bbox": [ + 105, + 692, + 323, + 705 + ], + "score": 1.0, + "content": "question representation. We denote the final output as", + "type": "text" + }, + { + "bbox": [ + 323, + 692, + 389, + 704 + ], + "score": 0.91, + "content": "Q _ { \\mathrm { c t x } } \\in \\mathbb { R } ^ { N _ { \\mathrm { e n t } } \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 390, + 692, + 394, + 705 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 43, + "bbox_fs": [ + 104, + 646, + 507, + 705 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 709, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 709, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 709, + 505, + 722 + ], + "score": 1.0, + "content": "While previous models usually focus on global or token-level dependencies (Hori et al., 2019; Le", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 720, + 505, + 733 + ], + "score": 1.0, + "content": "et al., 2019b) to encode question features, our modules compress fine-grained question representations", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 184, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 184, + 505, + 196 + ], + "score": 1.0, + "content": "at entity level. Specifically, find and summarize modules can generate entity-dependent local and", + "type": "text", + "cross_page": true + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 195, + 506, + 208 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 506, + 208 + ], + "score": 1.0, + "content": "global representations of question semantics. We show that our modularized approach can achieve", + "type": "text", + "cross_page": true + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 207, + 505, + 218 + ], + "spans": [ + { + "bbox": [ + 105, + 207, + 505, + 218 + ], + "score": 1.0, + "content": "better performance and transparency than traditional approaches to encode dialogue context (Serban", + "type": "text", + "cross_page": true + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 217, + 291, + 229 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 291, + 229 + ], + "score": 1.0, + "content": "et al., 2016; Vaswani et al., 2017) (Section 4).", + "type": "text", + "cross_page": true + } + ], + "index": 7 + } + ], + "index": 46.5, + "bbox_fs": [ + 105, + 709, + 505, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 110, + 79, + 502, + 141 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 110, + 79, + 502, + 141 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 110, + 79, + 502, + 141 + ], + "spans": [ + { + "bbox": [ + 110, + 79, + 502, + 141 + ], + "score": 0.961, + "type": "image", + "image_path": "f85b6a3de3efb5d106598bd63ca55e04399de8753853806ee05d04fae2725123.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 110, + 79, + 502, + 99.66666666666667 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 110, + 99.66666666666667, + 502, + 120.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 110, + 120.33333333333334, + 502, + 141.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 164, + 151, + 446, + 162 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 163, + 149, + 447, + 164 + ], + "spans": [ + { + "bbox": [ + 163, + 149, + 447, + 164 + ], + "score": 1.0, + "content": "Figure 3: find and summarize neural modules for dialogue understanding", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 3 + } + ], + "index": 2.0 + }, + { + "type": "text", + "bbox": [ + 107, + 184, + 505, + 228 + ], + "lines": [ + { + "bbox": [ + 105, + 184, + 505, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 184, + 505, + 196 + ], + "score": 1.0, + "content": "at entity level. 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In the setting with video summary, the summary", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "score": 1.0, + "content": "is concatenated to the dialogue history before the first dialogue turn. We also adapt VilNMN to the", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 362, + 506, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 506, + 376 + ], + "score": 1.0, + "content": "video QA benchmark TGIF-QA (Jang et al., 2017). Different from AVSD, TGIF-QA contains a", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 373, + 378, + 387 + ], + "spans": [ + { + "bbox": [ + 105, + 373, + 378, + 387 + ], + "score": 1.0, + "content": "diverse set of tasks, which address different visual aspects in video.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 18.5 + }, + { + "type": "text", + "bbox": [ + 107, + 390, + 505, + 468 + ], + "lines": [ + { + "bbox": [ + 105, + 389, + 505, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 404 + ], + "score": 1.0, + "content": "Training Procedure. We follow prior approaches (Hu et al., 2017; 2018; Kottur et al., 2018) by", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 401, + 506, + 415 + ], + "spans": [ + { + "bbox": [ + 105, + 401, + 506, + 415 + ], + "score": 1.0, + "content": "obtaining the annotations of the programs through a language parser (Hu et al., 2016) and a reference", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 412, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 412, + 506, + 426 + ], + "score": 1.0, + "content": "resolution model (Clark & Manning, 2016). During training, we directly use these soft labels of", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 424, + 506, + 436 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 506, + 436 + ], + "score": 1.0, + "content": "programs and the given ground-truth responses to train the models. The labels are augmented with", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 434, + 505, + 447 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 505, + 447 + ], + "score": 1.0, + "content": "label smoothing technique (Szegedy et al., 2016). During inference time, we generate all programs", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 445, + 506, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 506, + 459 + ], + "score": 1.0, + "content": "and responses from given dialogues and videos. We run beam search to enumerate programs for", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 456, + 503, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 503, + 470 + ], + "score": 1.0, + "content": "dialogue and video understanding and dialogue responses. 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System response is decoded by incorporating the dialogue context and video", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 132, + 505, + 146 + ], + "spans": [ + { + "bbox": [ + 105, + 132, + 505, + 146 + ], + "score": 1.0, + "content": "context outputs from the corresponding reasoning programs to target token representations. We", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 143, + 505, + 156 + ], + "spans": [ + { + "bbox": [ + 105, + 143, + 505, + 156 + ], + "score": 1.0, + "content": "follows a vanilla Transformer decoder architecture (Le et al., 2019b), which consists of 3 attention", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 153, + 505, + 168 + ], + "spans": [ + { + "bbox": [ + 105, + 153, + 362, + 168 + ], + "score": 1.0, + "content": "layers: self-attention to attend on existing tokens, attention to", + "type": "text" + }, + { + "bbox": [ + 362, + 155, + 383, + 166 + ], + "score": 0.9, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 153, + 505, + 168 + ], + "score": 1.0, + "content": "from dialogue understanding", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 165, + 455, + 179 + ], + "spans": [ + { + "bbox": [ + 105, + 165, + 250, + 179 + ], + "score": 1.0, + "content": "program execution, and attention to", + "type": "text" + }, + { + "bbox": [ + 251, + 165, + 269, + 176 + ], + "score": 0.9, + "content": "V _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 165, + 455, + 179 + ], + "score": 1.0, + "content": "from video understanding program execution.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 5, + "bbox_fs": [ + 105, + 121, + 505, + 179 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 182, + 505, + 217 + ], + "lines": [ + { + "bbox": [ + 105, + 181, + 506, + 196 + ], + "spans": [ + { + "bbox": [ + 105, + 181, + 506, + 196 + ], + "score": 1.0, + "content": "Optimization. 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We share the parameters between", + "type": "text" + }, + { + "bbox": [ + 291, + 243, + 303, + 253 + ], + "score": 0.69, + "content": "W", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 243, + 399, + 256 + ], + "score": 1.0, + "content": "and embedding matrix", + "type": "text" + }, + { + "bbox": [ + 399, + 244, + 408, + 253 + ], + "score": 0.79, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 243, + 505, + 256 + ], + "score": 1.0, + "content": ". The hyper-parameters", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 107, + 254, + 291, + 267 + ], + "spans": [ + { + "bbox": [ + 107, + 254, + 133, + 265 + ], + "score": 0.9, + "content": "\\alpha \\geq 0", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 254, + 150, + 267 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 151, + 254, + 169, + 266 + ], + "score": 0.9, + "content": "\\beta \\geq", + "type": "inline_equation" + }, + { + "bbox": [ + 169, + 254, + 291, + 267 + ], + "score": 1.0, + "content": "are fine-tuned during training.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 9, + "bbox_fs": [ + 105, + 181, + 506, + 218 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 221, + 505, + 266 + ], + "lines": [], + "index": 12.5, + "bbox_fs": [ + 105, + 220, + 507, + 267 + ], + "lines_deleted": true + }, + { + "type": "title", + "bbox": [ + 108, + 289, + 200, + 302 + ], + "lines": [ + { + "bbox": [ + 105, + 288, + 201, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 201, + 304 + ], + "score": 1.0, + "content": "4 EXPERIMENTS", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 107, + 318, + 505, + 385 + ], + "lines": [ + { + "bbox": [ + 105, + 317, + 505, + 333 + ], + "spans": [ + { + "bbox": [ + 105, + 317, + 318, + 333 + ], + "score": 1.0, + "content": "Datasets. We use the AVSD benchmark from the", + "type": "text" + }, + { + "bbox": [ + 318, + 318, + 333, + 329 + ], + "score": 0.87, + "content": "7 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 317, + 505, + 333 + ], + "score": 1.0, + "content": "Dialogue System Technology Challenge", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 330, + 505, + 343 + ], + "spans": [ + { + "bbox": [ + 105, + 330, + 505, + 343 + ], + "score": 1.0, + "content": "(DSTC7) (Hori et al., 2019). In the experiments with AVSD, we consider two settings: one with video", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 341, + 505, + 354 + ], + "spans": [ + { + "bbox": [ + 105, + 341, + 505, + 354 + ], + "score": 1.0, + "content": "summary and one without video summary as input. In the setting with video summary, the summary", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "spans": [ + { + "bbox": [ + 105, + 352, + 505, + 365 + ], + "score": 1.0, + "content": "is concatenated to the dialogue history before the first dialogue turn. We also adapt VilNMN to the", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 362, + 506, + 376 + ], + "spans": [ + { + "bbox": [ + 105, + 362, + 506, + 376 + ], + "score": 1.0, + "content": "video QA benchmark TGIF-QA (Jang et al., 2017). Different from AVSD, TGIF-QA contains a", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 373, + 378, + 387 + ], + "spans": [ + { + "bbox": [ + 105, + 373, + 378, + 387 + ], + "score": 1.0, + "content": "diverse set of tasks, which address different visual aspects in video.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 18.5, + "bbox_fs": [ + 105, + 317, + 506, + 387 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 390, + 505, + 468 + ], + "lines": [ + { + "bbox": [ + 105, + 389, + 505, + 404 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 404 + ], + "score": 1.0, + "content": "Training Procedure. We follow prior approaches (Hu et al., 2017; 2018; Kottur et al., 2018) by", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 401, + 506, + 415 + ], + "spans": [ + { + "bbox": [ + 105, + 401, + 506, + 415 + ], + "score": 1.0, + "content": "obtaining the annotations of the programs through a language parser (Hu et al., 2016) and a reference", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 412, + 506, + 426 + ], + "spans": [ + { + "bbox": [ + 105, + 412, + 506, + 426 + ], + "score": 1.0, + "content": "resolution model (Clark & Manning, 2016). During training, we directly use these soft labels of", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 424, + 506, + 436 + ], + "spans": [ + { + "bbox": [ + 105, + 424, + 506, + 436 + ], + "score": 1.0, + "content": "programs and the given ground-truth responses to train the models. The labels are augmented with", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 434, + 505, + 447 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 505, + 447 + ], + "score": 1.0, + "content": "label smoothing technique (Szegedy et al., 2016). During inference time, we generate all programs", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 445, + 506, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 506, + 459 + ], + "score": 1.0, + "content": "and responses from given dialogues and videos. We run beam search to enumerate programs for", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 456, + 503, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 503, + 470 + ], + "score": 1.0, + "content": "dialogue and video understanding and dialogue responses. (Please see Appendix B for more details).", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 25, + "bbox_fs": [ + 105, + 389, + 506, + 470 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 473, + 505, + 616 + ], + "lines": [ + { + "bbox": [ + 105, + 471, + 507, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 471, + 507, + 488 + ], + "score": 1.0, + "content": "AVSD Results. We evaluate model performance by the objective metrics based on word overlapping,", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 484, + 506, + 498 + ], + "spans": [ + { + "bbox": [ + 105, + 484, + 506, + 498 + ], + "score": 1.0, + "content": "including BLEU (Papineni et al., 2002), METEOR (Banerjee & Lavie, 2005), ROUGE-L (Lin,", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 106, + 496, + 506, + 509 + ], + "spans": [ + { + "bbox": [ + 106, + 496, + 506, + 509 + ], + "score": 1.0, + "content": "2004), and CIDEr (Vedantam et al., 2015), between each generated response and 6 reference gold", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 506, + 506, + 520 + ], + "spans": [ + { + "bbox": [ + 105, + 506, + 506, + 520 + ], + "score": 1.0, + "content": "responses. As seen in Table 2, our models outperform most of existing approaches. In particular,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 517, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 105, + 517, + 506, + 531 + ], + "score": 1.0, + "content": "the performance of our model in the setting without video summary input is comparable to the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 528, + 505, + 540 + ], + "spans": [ + { + "bbox": [ + 106, + 528, + 505, + 540 + ], + "score": 1.0, + "content": "GPT-based RLM (Li et al., 2020) with much smaller model size. The Student-Teacher baseline (Hori", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 539, + 506, + 552 + ], + "spans": [ + { + "bbox": [ + 105, + 539, + 506, + 552 + ], + "score": 1.0, + "content": "et al., 2019) specifically focuses on the performance gap between models with and without textual", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "spans": [ + { + "bbox": [ + 105, + 550, + 506, + 563 + ], + "score": 1.0, + "content": "signals from video summary through a dual network of expert and student models. Instead, VilNMN", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 561, + 506, + 575 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 506, + 575 + ], + "score": 1.0, + "content": "reduces this performance gap through efficiently extracting relevant visual/audio information based on", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 572, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 506, + 585 + ], + "score": 1.0, + "content": "fine-grained entity and action signals. We also found that VilNMN applied on object-level features is", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 506, + 596 + ], + "score": 1.0, + "content": "competitive to the model applied on CNN-based features. The flexibility of VilNMN neural programs", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 594, + 505, + 607 + ], + "spans": [ + { + "bbox": [ + 106, + 594, + 505, + 607 + ], + "score": 1.0, + "content": "can also be seen in the experiment when the video understanding program is applied on the caption", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 606, + 205, + 618 + ], + "spans": [ + { + "bbox": [ + 106, + 606, + 205, + 618 + ], + "score": 1.0, + "content": "input as a visual feature.", + "type": "text" + } + ], + "index": 41 + } + ], + "index": 35, + "bbox_fs": [ + 105, + 471, + 507, + 618 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 621, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 622, + 506, + 633 + ], + "spans": [ + { + "bbox": [ + 106, + 622, + 506, + 633 + ], + "score": 1.0, + "content": "Ablation Analysis. We experiment with several variants of VilMNM (either NMN or non-NMN-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 633, + 505, + 645 + ], + "spans": [ + { + "bbox": [ + 106, + 633, + 505, + 645 + ], + "score": 1.0, + "content": "based) in the setting with CNN based features and video summary input As can be seen in Table", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 644, + 505, + 657 + ], + "spans": [ + { + "bbox": [ + 106, + 644, + 505, + 657 + ], + "score": 1.0, + "content": "3, our approach to video and dialogue understanding through compositional reasoning programs", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 654, + 506, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 654, + 506, + 668 + ], + "score": 1.0, + "content": "exhibits better performance than non-compositional approaches. Compared to the approaches that", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "spans": [ + { + "bbox": [ + 105, + 665, + 506, + 678 + ], + "score": 1.0, + "content": "directly process frame-level features in videos (Row B) or token-level features in dialogues (Row C,", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 676, + 507, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 676, + 507, + 690 + ], + "score": 1.0, + "content": "D), our full VilNMN (Row A) considers entity-level and action-level information extraction and thus,", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "avoids unnecessary and possibly noisy extraction. Compared to the approaches that obtain dialogue", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 106, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "contextual cues through a hierarchical encoding architecture (Row E, F) such as (Serban et al., 2016;", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 722 + ], + "score": 1.0, + "content": "Hori et al., 2019), VilNMN directly addresses the challenge of entity references in dialogues. As", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 106, + 721, + 506, + 733 + ], + "spans": [ + { + "bbox": [ + 106, + 721, + 506, + 733 + ], + "score": 1.0, + "content": "mentioned, we hypothesize that the hierarchical encoding architecture is more appropriate for less", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 543, + 506, + 557 + ], + "spans": [ + { + "bbox": [ + 105, + 543, + 506, + 557 + ], + "score": 1.0, + "content": "entity-sensitive dialogues such as chit-chat and open-domain dialogues. Please see Appendix C for", + "type": "text", + "cross_page": true + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 556, + 439, + 567 + ], + "spans": [ + { + "bbox": [ + 106, + 556, + 439, + 567 + ], + "score": 1.0, + "content": "additional analysis of performance breakdown by dialogue turns and video lengths.", + "type": "text", + "cross_page": true + } + ], + "index": 11 + } + ], + "index": 46.5, + "bbox_fs": [ + 105, + 622, + 507, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "table", + "bbox": [ + 107, + 120, + 504, + 420 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 106, + 80, + 505, + 111 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 79, + 505, + 92 + ], + "spans": [ + { + "bbox": [ + 105, + 79, + 505, + 92 + ], + "score": 1.0, + "content": "Table 2: AVSD test results: The visual features are: I (I3D), ResNeXt-101 (RX), Faster-RCNN (FR), C (caption", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 90, + 506, + 102 + ], + "spans": [ + { + "bbox": [ + 105, + 90, + 506, + 102 + ], + "score": 1.0, + "content": "as a video input). The audio features are: VGGish (V), AclNet (A). Xon PT denotes models using pretrained", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 100, + 478, + 112 + ], + "spans": [ + { + "bbox": [ + 105, + 100, + 478, + 112 + ], + "score": 1.0, + "content": "weights and/or additional finetuning. Best and second best results are bold and underlined respectively.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "table_body", + "bbox": [ + 107, + 120, + 504, + 420 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 107, + 120, + 504, + 420 + ], + "spans": [ + { + "bbox": [ + 107, + 120, + 504, + 420 + ], + "score": 0.983, + "html": "
ModelPTVisualAudioBLEU4METEORROUGE-LCIDEr
Audio/Visual only (without Video Summary/Caption)
Baseline (Hori et al.,2019)I■0.3050.2170.4810.733
Baseline (Hori et al.,2019)IV0.3090.2150.4870.746
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3150.2390.5090.848
FGA (Schwartz et al.,2019)IV0.806
JMAN (Chu et al., 2020)I-0.3090.2400.5200.890
Student-Teacher (Hori et al.,2019)IV0.3710.2480.5270.966
MTN (Le et al.,2019b)I-0.3430.2470.5200.936
MTN (Le et al., 2019b)IV0.3680.2590.5370.964
MSTN (Lee et al.,2020)IV0.3790.2610.5481.028
RLM-GPT2 (Li et al., 2020)√IV0.4020.2540.5441.052
VilNMN=I-0.3970.2620.5501.059
VilNMNFR■0.3880.2590.5491.040
VilNMN-V0.3810.2520.5341.004
VilNMNIV0.3960.2630.5491.059
Audio/Visual only (with Video Summary/Caption)
TopicEmb (Kumar et al.,2019)IA0.3290.2230.4880.762
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3100.2420.5150.856
JMAN (Chu et al., 2020)I-0.3340.2390.5330.941
FA+HRED (Nguyen et al., 2018)=IV0.3600.2490.5440.997
VideoSum (Sanabria etal.,2019)=RX-0.3940.2670.5631.094
VideoSum+How2 (Sanabria et al.,2019)√RX-0.3870.2660.5641.087
MSTN (Lee et al.,2020)IV0.3770.2750.5661.115
Student-Teacher (Hori et al.,2019)IV0.4050.2730.5661.118
MTN (Le et al.,2019b)I-0.3920.2690.5591.066
MTN (Le et al.,2019b)IV0.4100.2740.5691.129
VGD-GPT2 (Le & Hoi,2020)√IV0.4360.2820.5791.194
RLM-GPT2 (Li et al., 2020)√IV0.4590.2940.6061.308
VilNMN■I10.4210.2770.5741.171
VilNMNFR-0.4210.2750.5711.148
VilNMNIV0.4210.2770.5731.167
VilNMNI+CV0.4290.2780.5781.188
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#ModelVariantBLEU4CIDEr
AFullVilNMN0.4211.171
BNo video NMNs; + vanilla text-→video attention0.4151.159
C→No dial.NMNs;+ response-→history attention0.4121.151
D→No dial.NMNs;+ response-→concat(history+question) attention0.4111.133
ENo dial.NMNs;+ HREDLsTM(history) + question attn.0.4141.153
F→No dial.NMNs; + HREDGRU(history) + question attn.0.4151.138
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Please see Appendix C for", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 106, + 556, + 439, + 567 + ], + "spans": [ + { + "bbox": [ + 106, + 556, + 439, + 567 + ], + "score": 1.0, + "content": "additional analysis of performance breakdown by dialogue turns and video lengths.", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10.5 + }, + { + "type": "text", + "bbox": [ + 106, + 572, + 505, + 682 + ], + "lines": [ + { + "bbox": [ + 106, + 572, + 505, + 585 + ], + "spans": [ + { + "bbox": [ + 106, + 572, + 505, + 585 + ], + "score": 1.0, + "content": "Intepretability. A difference of VilNMN from previous approaches to video-grounded dialogues", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 582, + 506, + 595 + ], + "spans": [ + { + "bbox": [ + 105, + 582, + 506, + 595 + ], + "score": 1.0, + "content": "is the model interpretability based on the predicted dialogue and video programs. From Figure 5,", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 594, + 506, + 607 + ], + "spans": [ + { + "bbox": [ + 106, + 594, + 506, + 607 + ], + "score": 1.0, + "content": "we observe that in cases where predicted dialogue programs and video program match or are close", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 605, + 506, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 605, + 506, + 617 + ], + "score": 1.0, + "content": "to the gold labels, the model can generate generally correct responses. In cases of wrong predicted", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 616, + 506, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 616, + 506, + 628 + ], + "score": 1.0, + "content": "responses, we can further look at how the model understands the questions based on predicted", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 626, + 506, + 640 + ], + "spans": [ + { + "bbox": [ + 104, + 626, + 176, + 640 + ], + "score": 1.0, + "content": "programs. In the", + "type": "text" + }, + { + "bbox": [ + 176, + 626, + 191, + 637 + ], + "score": 0.88, + "content": "3 ^ { r d }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 626, + 506, + 640 + ], + "score": 1.0, + "content": "turn of example 1, the output response is missing a minor detail as compared", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "score": 1.0, + "content": "to the label response because the video program fails to capture the parameter “rooftop”. These", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 648, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 506, + 662 + ], + "score": 1.0, + "content": "subtle yet important details can determine whether output responses can fully address user queries.", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 659, + 505, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 505, + 673 + ], + "score": 1.0, + "content": "Similarly, in example 2, the model answers the question “what room” instead of question about “an", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 671, + 377, + 683 + ], + "spans": [ + { + "bbox": [ + 105, + 671, + 377, + 683 + ], + "score": 1.0, + "content": "object”. For additional qualitative analysis, please see Appendix D.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 16.5 + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "TGIF-QA Results. In TGIF-QA experiments, we report the result using the L2 loss in Count task", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "and accuracy in other tasks. From Table 4, VilNMN outperforms all baseline models in all tasks", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "score": 1.0, + "content": "by a large margin. Compared to AVSD experiments, the TGIF-QA experiments emphasize video", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 721, + 506, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 506, + 734 + ], + "score": 1.0, + "content": "understanding ability of the models, removing the requirement for dialogue understanding and natural", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 23.5 + } + ], + "page_idx": 6, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 307, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 25, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 25, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 302, + 751, + 308, + 759 + ], + "lines": [ + { + "bbox": [ + 302, + 750, + 309, + 762 + ], + "spans": [ + { + "bbox": [ + 302, + 750, + 309, + 762 + ], + "score": 1.0, + "content": "7", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "table", + "bbox": [ + 107, + 120, + 504, + 420 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 106, + 80, + 505, + 111 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 79, + 505, + 92 + ], + "spans": [ + { + "bbox": [ + 105, + 79, + 505, + 92 + ], + "score": 1.0, + "content": "Table 2: AVSD test results: The visual features are: I (I3D), ResNeXt-101 (RX), Faster-RCNN (FR), C (caption", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 90, + 506, + 102 + ], + "spans": [ + { + "bbox": [ + 105, + 90, + 506, + 102 + ], + "score": 1.0, + "content": "as a video input). The audio features are: VGGish (V), AclNet (A). Xon PT denotes models using pretrained", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 100, + 478, + 112 + ], + "spans": [ + { + "bbox": [ + 105, + 100, + 478, + 112 + ], + "score": 1.0, + "content": "weights and/or additional finetuning. Best and second best results are bold and underlined respectively.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "table_body", + "bbox": [ + 107, + 120, + 504, + 420 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 107, + 120, + 504, + 420 + ], + "spans": [ + { + "bbox": [ + 107, + 120, + 504, + 420 + ], + "score": 0.983, + "html": "
ModelPTVisualAudioBLEU4METEORROUGE-LCIDEr
Audio/Visual only (without Video Summary/Caption)
Baseline (Hori et al.,2019)I■0.3050.2170.4810.733
Baseline (Hori et al.,2019)IV0.3090.2150.4870.746
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3150.2390.5090.848
FGA (Schwartz et al.,2019)IV0.806
JMAN (Chu et al., 2020)I-0.3090.2400.5200.890
Student-Teacher (Hori et al.,2019)IV0.3710.2480.5270.966
MTN (Le et al.,2019b)I-0.3430.2470.5200.936
MTN (Le et al., 2019b)IV0.3680.2590.5370.964
MSTN (Lee et al.,2020)IV0.3790.2610.5481.028
RLM-GPT2 (Li et al., 2020)√IV0.4020.2540.5441.052
VilNMN=I-0.3970.2620.5501.059
VilNMNFR■0.3880.2590.5491.040
VilNMN-V0.3810.2520.5341.004
VilNMNIV0.3960.2630.5491.059
Audio/Visual only (with Video Summary/Caption)
TopicEmb (Kumar et al.,2019)IA0.3290.2230.4880.762
Baseline+GRU+Attn.(Le et al.,2019a)IV0.3100.2420.5150.856
JMAN (Chu et al., 2020)I-0.3340.2390.5330.941
FA+HRED (Nguyen et al., 2018)=IV0.3600.2490.5440.997
VideoSum (Sanabria etal.,2019)=RX-0.3940.2670.5631.094
VideoSum+How2 (Sanabria et al.,2019)√RX-0.3870.2660.5641.087
MSTN (Lee et al.,2020)IV0.3770.2750.5661.115
Student-Teacher (Hori et al.,2019)IV0.4050.2730.5661.118
MTN (Le et al.,2019b)I-0.3920.2690.5591.066
MTN (Le et al.,2019b)IV0.4100.2740.5691.129
VGD-GPT2 (Le & Hoi,2020)√IV0.4360.2820.5791.194
RLM-GPT2 (Li et al., 2020)√IV0.4590.2940.6061.308
VilNMN■I10.4210.2770.5741.171
VilNMNFR-0.4210.2750.5711.148
VilNMNIV0.4210.2770.5731.167
VilNMNI+CV0.4290.2780.5781.188
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#ModelVariantBLEU4CIDEr
AFullVilNMN0.4211.171
BNo video NMNs; + vanilla text-→video attention0.4151.159
C→No dial.NMNs;+ response-→history attention0.4121.151
D→No dial.NMNs;+ response-→concat(history+question) attention0.4111.133
ENo dial.NMNs;+ HREDLsTM(history) + question attn.0.4141.153
F→No dial.NMNs; + HREDGRU(history) + question attn.0.4151.138
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In cases of wrong predicted", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 616, + 506, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 616, + 506, + 628 + ], + "score": 1.0, + "content": "responses, we can further look at how the model understands the questions based on predicted", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 626, + 506, + 640 + ], + "spans": [ + { + "bbox": [ + 104, + 626, + 176, + 640 + ], + "score": 1.0, + "content": "programs. In the", + "type": "text" + }, + { + "bbox": [ + 176, + 626, + 191, + 637 + ], + "score": 0.88, + "content": "3 ^ { r d }", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 626, + 506, + 640 + ], + "score": 1.0, + "content": "turn of example 1, the output response is missing a minor detail as compared", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "spans": [ + { + "bbox": [ + 105, + 638, + 505, + 651 + ], + "score": 1.0, + "content": "to the label response because the video program fails to capture the parameter “rooftop”. These", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 648, + 506, + 662 + ], + "spans": [ + { + "bbox": [ + 105, + 648, + 506, + 662 + ], + "score": 1.0, + "content": "subtle yet important details can determine whether output responses can fully address user queries.", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 659, + 505, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 659, + 505, + 673 + ], + "score": 1.0, + "content": "Similarly, in example 2, the model answers the question “what room” instead of question about “an", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 671, + 377, + 683 + ], + "spans": [ + { + "bbox": [ + 105, + 671, + 377, + 683 + ], + "score": 1.0, + "content": "object”. For additional qualitative analysis, please see Appendix D.", + "type": "text" + } + ], + "index": 21 + } + ], + "index": 16.5, + "bbox_fs": [ + 104, + 572, + 506, + 683 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 687, + 504, + 732 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 506, + 700 + ], + "score": 1.0, + "content": "TGIF-QA Results. In TGIF-QA experiments, we report the result using the L2 loss in Count task", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "and accuracy in other tasks. From Table 4, VilNMN outperforms all baseline models in all tasks", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 709, + 506, + 723 + ], + "score": 1.0, + "content": "by a large margin. Compared to AVSD experiments, the TGIF-QA experiments emphasize video", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 721, + 506, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 506, + 734 + ], + "score": 1.0, + "content": "understanding ability of the models, removing the requirement for dialogue understanding and natural", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 687, + 505, + 700 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 505, + 700 + ], + "score": 1.0, + "content": "language generation. This is demonstrated through higher performance gaps between VilNMN with", + "type": "text", + "cross_page": true + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 699, + 506, + 711 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 506, + 711 + ], + "score": 1.0, + "content": "generated programs and soft label programs as compared to ones in AVSD experiments. We also", + "type": "text", + "cross_page": true + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 710, + 504, + 722 + ], + "spans": [ + { + "bbox": [ + 105, + 710, + 504, + 722 + ], + "score": 1.0, + "content": "observe that an attention layer attending to question is important during the response decoding phase", + "type": "text", + "cross_page": true + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 721, + 382, + 732 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 282, + 732 + ], + "score": 1.0, + "content": "in TGIF-QA as there is no dialogue context", + "type": "text", + "cross_page": true + }, + { + "bbox": [ + 282, + 721, + 303, + 732 + ], + "score": 0.91, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 303, + 721, + 382, + 732 + ], + "score": 1.0, + "content": "in Video QA tasks.", + "type": "text", + "cross_page": true + } + ], + "index": 21 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 687, + 506, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 131, + 85, + 483, + 114 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 131, + 85, + 483, + 114 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 131, + 85, + 483, + 114 + ], + "spans": [ + { + "bbox": [ + 131, + 85, + 483, + 114 + ], + "score": 0.699, + "type": "image", + "image_path": "b76cdb81c535fa60c73e2ed0fbce53a5355fe5d0af1cb511403543cd18aa93a9.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 131, + 85, + 483, + 94.66666666666667 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 131, + 94.66666666666667, + 483, + 104.33333333333334 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 131, + 104.33333333333334, + 483, + 114.00000000000001 + ], + "spans": [], + "index": 2 + } + ] + } + ], + "index": 1 + }, + { + "type": "table", + "bbox": [ + 111, + 115, + 502, + 252 + ], + "blocks": [ + { + "type": "table_body", + "bbox": [ + 111, + 115, + 502, + 252 + ], + "group_id": 1, + "lines": [ + { + "bbox": [ + 111, + 115, + 502, + 252 + ], + "spans": [ + { + "bbox": [ + 111, + 115, + 502, + 252 + ], + "score": 0.744, + "html": "
TurnQuestionDialogue NMNVideo NMNResponse
3...what are theydoing in the scene ?are they on arooftop?Predicted:find(they),find(the scene)→summarize()×Gold: find(they)→summarize()Predicted: where(two men in thevideo),where(the scene)→when(doing inthe scene)→describe(what)Gold:where(two men),where (rooftop)→when(doing in the scene)-describe(what)Predicted: one is washinga chair and the other istaking picturesXGold: yes,on a secondfloor roof deck ,one man iswashing a chair,anotherman is either filming ortaking pictures
4does he sit in thechair after washingit?Predicted:find (he),find(the chair)→summarize()Gold: find(he),find(the chair)→summarize()Predicted: where(one man in the video),where(a chair)→ when(sit in the chairafter washing it)-exist()Gold:where(one man),where(a chair)→when(sit in the chair after washingit)-exist()Predicted: no, he does notsit in the chair√Gold: no he does not,thereis a pipe with water runningall over
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ModelVisualCount (Loss)Action (Acc)Transition (Acc)FrameQA (Acc)
VIS(avg) (Ren et al.,2015a)R4.800.4880.3480.350
MCB (aggr) (Fukui et al.,2016)R5.170.5890.2430.257
Yu et al. (Yu et al., 2017)R5.130.5610.6400.396
ST-VQA (t) (Gao et al., 2018)R+F4.320.6290.6940.495
Co-Mem (Gao et al.,2018)R+F4.100.6820.7430.515
PSAC (Li et al.,2019)R4.270.7040.7690.557
HME (Fan et al.,2019)R+C4.020.7390.7780.538
STA (Gao et al.,2019)R4.250.7230.7900.566
CRN+MAC (Le et al.,2019c)R4.230.7130.7870.592
MQL (Lei et al., 2020)V---0.598
QueST (Jiang et al.,2020)R4.190.7590.8100.597
HGA (Jiang & Han,2020)R+C4.090.7540.8100.551
GCN (Huang et al., 2020)R+C3.950.7430.8110.563
HCRN (Le et al.,2020)R+RX3.820.7500.8140.559
VilNMNR2.650.8450.8870.747
→soft label programsR1.900.8570.8980.780
→- res-to-question attn.R3.280.8010.7760.679
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TurnQuestionDialogue NMNVideo NMNResponse
3...what are theydoing in the scene ?are they on arooftop?Predicted:find(they),find(the scene)→summarize()×Gold: find(they)→summarize()Predicted: where(two men in thevideo),where(the scene)→when(doing inthe scene)→describe(what)Gold:where(two men),where (rooftop)→when(doing in the scene)-describe(what)Predicted: one is washinga chair and the other istaking picturesXGold: yes,on a secondfloor roof deck ,one man iswashing a chair,anotherman is either filming ortaking pictures
4does he sit in thechair after washingit?Predicted:find (he),find(the chair)→summarize()Gold: find(he),find(the chair)→summarize()Predicted: where(one man in the video),where(a chair)→ when(sit in the chairafter washing it)-exist()Gold:where(one man),where(a chair)→when(sit in the chair after washingit)-exist()Predicted: no, he does notsit in the chair√Gold: no he does not,thereis a pipe with water runningall over
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ModelVisualCount (Loss)Action (Acc)Transition (Acc)FrameQA (Acc)
VIS(avg) (Ren et al.,2015a)R4.800.4880.3480.350
MCB (aggr) (Fukui et al.,2016)R5.170.5890.2430.257
Yu et al. (Yu et al., 2017)R5.130.5610.6400.396
ST-VQA (t) (Gao et al., 2018)R+F4.320.6290.6940.495
Co-Mem (Gao et al.,2018)R+F4.100.6820.7430.515
PSAC (Li et al.,2019)R4.270.7040.7690.557
HME (Fan et al.,2019)R+C4.020.7390.7780.538
STA (Gao et al.,2019)R4.250.7230.7900.566
CRN+MAC (Le et al.,2019c)R4.230.7130.7870.592
MQL (Lei et al., 2020)V---0.598
QueST (Jiang et al.,2020)R4.190.7590.8100.597
HGA (Jiang & Han,2020)R+C4.090.7540.8100.551
GCN (Huang et al., 2020)R+C3.950.7430.8110.563
HCRN (Le et al.,2020)R+RX3.820.7500.8140.559
VilNMNR2.650.8450.8870.747
→soft label programsR1.900.8570.8980.780
→- res-to-question attn.R3.280.8010.7760.679
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In this work, we introduce Visio-Linguistic Neural Module", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 138, + 506, + 153 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 506, + 153 + ], + "score": 1.0, + "content": "Network (VilNMN). VilNMN consists of dialogue and video understanding neural modules, each", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 150, + 505, + 163 + ], + "spans": [ + { + "bbox": [ + 106, + 150, + 505, + 163 + ], + "score": 1.0, + "content": "of which performs entity and action-level operations on language and video components. Our", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 162, + 505, + 173 + ], + "spans": [ + { + "bbox": [ + 105, + 162, + 505, + 173 + ], + "score": 1.0, + "content": "comprehensive experiments on AVSD and TGIF-QA benchmarks show that our models can achieve", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 173, + 489, + 185 + ], + "spans": [ + { + "bbox": [ + 105, + 173, + 489, + 185 + ], + "score": 1.0, + "content": "competitive performance while promoting a compositional and interpretable learning approach.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 4 + }, + { + "type": "title", + "bbox": [ + 108, + 201, + 175, + 213 + ], + "lines": [ + { + "bbox": [ + 106, + 200, + 176, + 215 + ], + "spans": [ + { + "bbox": [ + 106, + 200, + 176, + 215 + ], + "score": 1.0, + "content": "REFERENCES", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "text", + "bbox": [ + 108, + 220, + 506, + 264 + ], + "lines": [ + { + "bbox": [ + 105, + 219, + 507, + 233 + ], + "spans": [ + { + "bbox": [ + 105, + 219, + 507, + 233 + ], + "score": 1.0, + "content": "Aishwarya Agrawal, Dhruv Batra, and Devi Parikh. 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We exploit", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 536, + 505, + 549 + ], + "spans": [ + { + "bbox": [ + 105, + 536, + 505, + 549 + ], + "score": 1.0, + "content": "the multi-head and feed-forward architecture, which show good performance in NLP tasks such as", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 104, + 546, + 506, + 561 + ], + "spans": [ + { + "bbox": [ + 104, + 546, + 506, + 561 + ], + "score": 1.0, + "content": "NMT and QA (Vaswani et al., 2017; Dehghani et al., 2019), to efficiently incorporate contextual cues", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 558, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 506, + 572 + ], + "score": 1.0, + "content": "from dialogue components to parse question into reasoning programs. 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However, to exploit dialogue contextual cues, the execution output", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 669, + 506, + 683 + ], + "spans": [ + { + "bbox": [ + 105, + 669, + 280, + 683 + ], + "score": 1.0, + "content": "of dialogue understanding neural modules", + "type": "text" + }, + { + "bbox": [ + 281, + 670, + 301, + 682 + ], + "score": 0.91, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 302, + 669, + 436, + 683 + ], + "score": 1.0, + "content": "is incorporated to each vector in", + "type": "text" + }, + { + "bbox": [ + 436, + 670, + 457, + 681 + ], + "score": 0.9, + "content": "P _ { \\mathrm { d i a l } }", + "type": "inline_equation" + }, + { + "bbox": [ + 458, + 669, + 506, + 683 + ], + "score": 1.0, + "content": "through an", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 681, + 505, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 681, + 505, + 694 + ], + "score": 1.0, + "content": "additional attention layer. 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It is equivalent to a reasoning process that converts the question", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 703, + 358, + 716 + ], + "spans": [ + { + "bbox": [ + 106, + 703, + 358, + 716 + ], + "score": 1.0, + "content": "from its original multi-turn semantics to single-turn semantics.", + "type": "text" + } + ], + "index": 43 + } + ], + "index": 40.5, + "bbox_fs": [ + 105, + 648, + 506, + 716 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 213, + 717, + 398, + 734 + ], + "lines": [ + { + "bbox": [ + 213, + 717, + 398, + 734 + ], + "spans": [ + { + "bbox": [ + 213, + 717, + 398, + 734 + ], + "score": 0.92, + "content": "{ \\cal A } _ { \\mathrm { v i d } } ^ { ( 3 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { v i d } } ^ { ( 2 ) } , Q _ { \\mathrm { c t x } } , Q _ { \\mathrm { c t x } } ) \\in \\mathbb { R } ^ { j \\times d }", + "type": "interline_equation", + "image_path": "335ad4722cdd4bc3bba8fb642d8cfdf0d0e4a5a042b1db1e3ba3900ae0c730af.jpg" + } + ] + } + ], + "index": 44, + "virtual_lines": [ + { + "bbox": [ + 213, + 717, + 398, + 734 + ], + "spans": [], + "index": 44 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 82, + 223, + 93 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 224, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 224, + 96 + ], + "score": 1.0, + "content": "A.3 NON-NMN MODELS", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 105, + 102, + 497, + 115 + ], + "lines": [ + { + "bbox": [ + 105, + 101, + 497, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 101, + 497, + 117 + ], + "score": 1.0, + "content": "For ablation analysis, we evaluate several variants of VilNMN, based on the following categories:", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 106, + 119, + 505, + 175 + ], + "lines": [ + { + "bbox": [ + 105, + 119, + 506, + 133 + ], + "spans": [ + { + "bbox": [ + 105, + 119, + 506, + 133 + ], + "score": 1.0, + "content": "To test the contribution of our NMN approach for video understanding, we remove the parser for", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 131, + 505, + 143 + ], + "spans": [ + { + "bbox": [ + 106, + 131, + 505, + 143 + ], + "score": 1.0, + "content": "video understanding program and related neural modules and replace them with pure neural network", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 142, + 505, + 154 + ], + "spans": [ + { + "bbox": [ + 106, + 142, + 189, + 154 + ], + "score": 1.0, + "content": "architecture (Model", + "type": "text" + }, + { + "bbox": [ + 189, + 143, + 197, + 152 + ], + "score": 0.4, + "content": "B", + "type": "inline_equation" + }, + { + "bbox": [ + 197, + 142, + 505, + 154 + ], + "score": 1.0, + "content": "). 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First, we replace the original attention on dialogue context", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 107, + 244, + 506, + 257 + ], + "spans": [ + { + "bbox": [ + 107, + 244, + 127, + 256 + ], + "score": 0.9, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 244, + 477, + 257 + ], + "score": 1.0, + "content": "with two attention layers to attend on dialogue history and question sequentially (Model", + "type": "text" + }, + { + "bbox": [ + 477, + 245, + 485, + 254 + ], + "score": 0.55, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 244, + 506, + 257 + ], + "score": 1.0, + "content": "). As", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 254, + 505, + 269 + ], + "spans": [ + { + "bbox": [ + 104, + 254, + 505, + 269 + ], + "score": 1.0, + "content": "noted by Le et al. (2019b), question input contains much more relevant signals than dialogue history", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 266, + 417, + 280 + ], + "spans": [ + { + "bbox": [ + 105, + 266, + 417, + 280 + ], + "score": 1.0, + "content": "and attention operation should be separated from the one on dialogue history.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 11 + }, + { + "type": "interline_equation", + "bbox": [ + 221, + 281, + 390, + 316 + ], + "lines": [ + { + "bbox": [ + 221, + 281, + 390, + 316 + ], + "spans": [ + { + "bbox": [ + 221, + 281, + 390, + 316 + ], + "score": 0.92, + "content": "\\begin{array} { r } { A _ { \\mathrm { r e s } } ^ { ( 2 a ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 1 ) } , H , H ) \\in \\mathbb { R } ^ { j \\times d } } \\\\ { A _ { \\mathrm { r e s } } ^ { ( 2 b ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 2 a ) } , Q , Q ) \\in \\mathbb { R } ^ { j \\times d } } \\end{array}", + "type": "interline_equation", + "image_path": "67b6fd4ca874e4b641145983c7d5e1caccd86a85b112bff258860efc295e4c70.jpg" + } + ] + } + ], + "index": 15.5, + "virtual_lines": [ + { + "bbox": [ + 221, + 281, + 390, + 298.5 + ], + "spans": [], + "index": 15 + }, + { + "bbox": [ + 221, + 298.5, + 390, + 316.0 + ], + "spans": [], + "index": 16 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 319, + 504, + 342 + ], + "lines": [ + { + "bbox": [ + 106, + 319, + 506, + 332 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 506, + 332 + ], + "score": 1.0, + "content": "Alternatively, we simply concatenate dialogue and question embeddings similarly to (Hori et al.,", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 329, + 458, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 329, + 443, + 342 + ], + "score": 1.0, + "content": "2019; Sanabria et al., 2019) and use it as input to the original attention layer (Model", + "type": "text" + }, + { + "bbox": [ + 443, + 331, + 451, + 340 + ], + "score": 0.57, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 329, + 458, + 342 + ], + "score": 1.0, + "content": ").", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17.5 + }, + { + "type": "interline_equation", + "bbox": [ + 206, + 346, + 405, + 362 + ], + "lines": [ + { + "bbox": [ + 206, + 346, + 405, + 362 + ], + "spans": [ + { + "bbox": [ + 206, + 346, + 405, + 362 + ], + "score": 0.88, + "content": "A _ { \\mathrm { r e s } } ^ { ( 2 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 1 ) } , [ H ; Q ] , [ H ; Q ] ) \\in \\mathbb { R } ^ { j \\times d }", + "type": "interline_equation", + "image_path": "9807127436c12da449db19c4727e8cd774eaf3bc4bac9d756378aa28cc1fd385.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 206, + 346, + 405, + 362 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 366, + 506, + 444 + ], + "lines": [ + { + "bbox": [ + 105, + 366, + 506, + 379 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 506, + 379 + ], + "score": 1.0, + "content": "To use more sophisticated neural models for dialogue understanding, we further adopt the hierarchical", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 378, + 506, + 389 + ], + "spans": [ + { + "bbox": [ + 105, + 378, + 506, + 389 + ], + "score": 1.0, + "content": "encoding architecture with question attention (Li et al., 2016; Serban et al., 2016; Hori et al., 2019).", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 388, + 506, + 401 + ], + "spans": [ + { + "bbox": [ + 105, + 388, + 189, + 401 + ], + "score": 1.0, + "content": "Each dialogue turn", + "type": "text" + }, + { + "bbox": [ + 189, + 389, + 202, + 399 + ], + "score": 0.88, + "content": "\\mathcal { H } _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 388, + 506, + 401 + ], + "score": 1.0, + "content": ", including a pair of human utterance and system response, is processed", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 399, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 399, + 324, + 411 + ], + "score": 1.0, + "content": "separately by a word-level RNN such as LSTM (Model", + "type": "text" + }, + { + "bbox": [ + 324, + 400, + 332, + 409 + ], + "score": 0.51, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 399, + 399, + 411 + ], + "score": 1.0, + "content": ") or GRU (Model", + "type": "text" + }, + { + "bbox": [ + 400, + 400, + 408, + 410 + ], + "score": 0.6, + "content": "F", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 399, + 506, + 411 + ], + "score": 1.0, + "content": "). A sentence-level RNN", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 411, + 506, + 423 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 506, + 423 + ], + "score": 1.0, + "content": "is used to sequentially process the last hidden states obtained previously turn by turn. The output in", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 421, + 506, + 434 + ], + "spans": [ + { + "bbox": [ + 106, + 421, + 506, + 434 + ], + "score": 1.0, + "content": "each recurrent step is fed to an attention layer such as (Bahdanau et al., 2015; Vaswani et al., 2017) to", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 431, + 340, + 446 + ], + "spans": [ + { + "bbox": [ + 105, + 431, + 340, + 446 + ], + "score": 1.0, + "content": "obtain question-aware representations of dialogue history.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23 + }, + { + "type": "interline_equation", + "bbox": [ + 221, + 447, + 390, + 513 + ], + "lines": [ + { + "bbox": [ + 221, + 447, + 390, + 513 + ], + "spans": [ + { + "bbox": [ + 221, + 447, + 390, + 513 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { H _ { t } ^ { \\mathrm { w o r d } } = \\mathrm { R N N } ( H _ { t } ) \\in \\mathbb { R } ^ { d } } \\\\ & { H _ { t } ^ { \\mathrm { s e n t } } = \\mathrm { R N N } ( H _ { t } ^ { \\mathrm { w o r d } } ) \\in \\mathbb { R } ^ { d } } \\\\ & { \\qquad H = [ H _ { t } ^ { \\mathrm { s e n t } } ] | _ { t = 1 } ^ { T - 1 } \\in \\mathbb { R } ^ { d \\times ( T - 1 ) } } \\\\ & { Q _ { \\mathrm { c t x } } = \\mathrm { A t t e n t i o n } ( Q , H , H ) \\in \\mathbb { R } ^ { L _ { Q } \\times d } } \\end{array}", + "type": "interline_equation", + "image_path": "6b500eb54336338b23fae1788baf2b04763d7328a4509692dfd78778ea5abe21.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 221, + 447, + 390, + 460.2 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 221, + 460.2, + 390, + 473.4 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 221, + 473.4, + 390, + 486.59999999999997 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 221, + 486.59999999999997, + 390, + 499.79999999999995 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 221, + 499.79999999999995, + 390, + 513.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 517, + 504, + 540 + ], + "lines": [ + { + "bbox": [ + 105, + 516, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 105, + 516, + 133, + 531 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 518, + 142, + 527 + ], + "score": 0.83, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 516, + 355, + 531 + ], + "score": 1.0, + "content": "is the current dialogue turn. The output is treated as", + "type": "text" + }, + { + "bbox": [ + 356, + 518, + 376, + 529 + ], + "score": 0.92, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 516, + 506, + 531 + ], + "score": 1.0, + "content": "and is fed to the corresponding", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 528, + 263, + 540 + ], + "spans": [ + { + "bbox": [ + 106, + 528, + 263, + 540 + ], + "score": 1.0, + "content": "attention layer in the response decoder.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5 + }, + { + "type": "title", + "bbox": [ + 107, + 555, + 314, + 568 + ], + "lines": [ + { + "bbox": [ + 105, + 554, + 315, + 570 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 315, + 570 + ], + "score": 1.0, + "content": "B ADDITIONAL EXPERIMENT DETAILS", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "title", + "bbox": [ + 107, + 580, + 178, + 592 + ], + "lines": [ + { + "bbox": [ + 105, + 580, + 179, + 593 + ], + "spans": [ + { + "bbox": [ + 105, + 580, + 179, + 593 + ], + "score": 1.0, + "content": "B.1 DATASETS", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 106, + 600, + 506, + 711 + ], + "lines": [ + { + "bbox": [ + 105, + 600, + 505, + 614 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 505, + 614 + ], + "score": 1.0, + "content": "We use the AVSD benchmark from DSTC7 (Hori et al., 2019) which consists of dialogues grounded", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 611, + 507, + 626 + ], + "spans": [ + { + "bbox": [ + 105, + 611, + 507, + 626 + ], + "score": 1.0, + "content": "on the Charades videos (Sigurdsson et al., 2016). Each dialogue contains up to 10 dialogue turns,", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 623, + 506, + 636 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 506, + 636 + ], + "score": 1.0, + "content": "each turn consists of a question and expected response about a given video. For visual features, we", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 634, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 106, + 634, + 506, + 646 + ], + "score": 1.0, + "content": "use the 3D CNN based features from a pretrained I3D model (Carreira & Zisserman, 2017) and", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 645, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 645, + 506, + 658 + ], + "score": 1.0, + "content": "object-level features from a pretrained FasterRNN model (Ren et al., 2015b). The audio features are", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 656, + 506, + 669 + ], + "spans": [ + { + "bbox": [ + 106, + 656, + 506, + 669 + ], + "score": 1.0, + "content": "obtained from a pretrained VGGish model (Hershey et al., 2017). In the experiments with AVSD,", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 667, + 506, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 506, + 680 + ], + "score": 1.0, + "content": "we consider two settings: one with video summary and one without video summary as input. In the", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 678, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 678, + 506, + 690 + ], + "score": 1.0, + "content": "setting with video summary, the summary is concatenated to the dialogue history before the first", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 688, + 507, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 507, + 702 + ], + "score": 1.0, + "content": "dialogue turn. We also adapt VilNMN to the video QA benchmark TGIF-QA (Jang et al., 2017).", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 700, + 380, + 713 + ], + "spans": [ + { + "bbox": [ + 105, + 700, + 380, + 713 + ], + "score": 1.0, + "content": "Different from AVSD, TGIF-QA contains a diverse set of QA tasks:", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 40.5 + }, + { + "type": "text", + "bbox": [ + 133, + 720, + 447, + 732 + ], + "lines": [ + { + "bbox": [ + 133, + 719, + 448, + 734 + ], + "spans": [ + { + "bbox": [ + 133, + 719, + 448, + 734 + ], + "score": 1.0, + "content": "• Count: open-ended task which counts the number of repetitions of an action", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 46 + } + ], + "page_idx": 14, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 307, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 751, + 310, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 13 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "title", + "bbox": [ + 108, + 82, + 223, + 93 + ], + "lines": [ + { + "bbox": [ + 105, + 81, + 224, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 81, + 224, + 96 + ], + "score": 1.0, + "content": "A.3 NON-NMN MODELS", + "type": "text" + } + ], + "index": 0 + } + ], + "index": 0 + }, + { + "type": "text", + "bbox": [ + 105, + 102, + 497, + 115 + ], + "lines": [ + { + "bbox": [ + 105, + 101, + 497, + 117 + ], + "spans": [ + { + "bbox": [ + 105, + 101, + 497, + 117 + ], + "score": 1.0, + "content": "For ablation analysis, we evaluate several variants of VilNMN, based on the following categories:", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 1, + "bbox_fs": [ + 105, + 101, + 497, + 117 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 119, + 505, + 175 + ], + "lines": [ + { + "bbox": [ + 105, + 119, + 506, + 133 + ], + "spans": [ + { + "bbox": [ + 105, + 119, + 506, + 133 + ], + "score": 1.0, + "content": "To test the contribution of our NMN approach for video understanding, we remove the parser for", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 106, + 131, + 505, + 143 + ], + "spans": [ + { + "bbox": [ + 106, + 131, + 505, + 143 + ], + "score": 1.0, + "content": "video understanding program and related neural modules and replace them with pure neural network", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 106, + 142, + 505, + 154 + ], + "spans": [ + { + "bbox": [ + 106, + 142, + 189, + 154 + ], + "score": 1.0, + "content": "architecture (Model", + "type": "text" + }, + { + "bbox": [ + 189, + 143, + 197, + 152 + ], + "score": 0.4, + "content": "B", + "type": "inline_equation" + }, + { + "bbox": [ + 197, + 142, + 505, + 154 + ], + "score": 1.0, + "content": "). Specifically, we remove neural modules where, when, describe, and", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 153, + 505, + 166 + ], + "spans": [ + { + "bbox": [ + 106, + 153, + 333, + 166 + ], + "score": 1.0, + "content": "exist. We then directly use video feature embeddings", + "type": "text" + }, + { + "bbox": [ + 333, + 153, + 343, + 163 + ], + "score": 0.77, + "content": "V", + "type": "inline_equation" + }, + { + "bbox": [ + 343, + 153, + 354, + 166 + ], + "score": 1.0, + "content": "as", + "type": "text" + }, + { + "bbox": [ + 354, + 153, + 373, + 164 + ], + "score": 0.91, + "content": "V _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 153, + 505, + 166 + ], + "score": 1.0, + "content": "as input to the original attention", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 106, + 164, + 421, + 176 + ], + "spans": [ + { + "bbox": [ + 106, + 164, + 421, + 176 + ], + "score": 1.0, + "content": "layer in response decoder similarly to (Hori et al., 2019; Sanabria et al., 2019).", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 4, + "bbox_fs": [ + 105, + 119, + 506, + 176 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 226, + 180, + 385, + 195 + ], + "lines": [ + { + "bbox": [ + 226, + 180, + 385, + 195 + ], + "spans": [ + { + "bbox": [ + 226, + 180, + 385, + 195 + ], + "score": 0.93, + "content": "A _ { \\mathrm { r e s } } ^ { ( 3 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 2 ) } , V , V ) \\in \\mathbb { R } ^ { j \\times d }", + "type": "interline_equation", + "image_path": "a64039d80b0768602dda3b32d7281868fb23b3f63ea8cf6017adafc8f16007e0.jpg" + } + ] + } + ], + "index": 7, + "virtual_lines": [ + { + "bbox": [ + 226, + 180, + 385, + 195 + ], + "spans": [], + "index": 7 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 199, + 505, + 278 + ], + "lines": [ + { + "bbox": [ + 105, + 199, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 199, + 505, + 213 + ], + "score": 1.0, + "content": "To further test the contribution of NMN architecture for dialogue understanding, we similarly remove", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 211, + 506, + 224 + ], + "spans": [ + { + "bbox": [ + 105, + 211, + 506, + 224 + ], + "score": 1.0, + "content": "the question parser for dialogue understanding program and neural modules find and describe.", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 222, + 505, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 319, + 235 + ], + "score": 1.0, + "content": "We then directly use the dialogue history embeddings", + "type": "text" + }, + { + "bbox": [ + 319, + 223, + 329, + 232 + ], + "score": 0.83, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 222, + 433, + 235 + ], + "score": 1.0, + "content": "and question embeddings", + "type": "text" + }, + { + "bbox": [ + 433, + 223, + 442, + 234 + ], + "score": 0.85, + "content": "Q", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 222, + 505, + 235 + ], + "score": 1.0, + "content": "as inputs to the", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 233, + 505, + 246 + ], + "spans": [ + { + "bbox": [ + 105, + 233, + 505, + 246 + ], + "score": 1.0, + "content": "response decoder in two different ways. First, we replace the original attention on dialogue context", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 107, + 244, + 506, + 257 + ], + "spans": [ + { + "bbox": [ + 107, + 244, + 127, + 256 + ], + "score": 0.9, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 127, + 244, + 477, + 257 + ], + "score": 1.0, + "content": "with two attention layers to attend on dialogue history and question sequentially (Model", + "type": "text" + }, + { + "bbox": [ + 477, + 245, + 485, + 254 + ], + "score": 0.55, + "content": "C", + "type": "inline_equation" + }, + { + "bbox": [ + 485, + 244, + 506, + 257 + ], + "score": 1.0, + "content": "). As", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 104, + 254, + 505, + 269 + ], + "spans": [ + { + "bbox": [ + 104, + 254, + 505, + 269 + ], + "score": 1.0, + "content": "noted by Le et al. (2019b), question input contains much more relevant signals than dialogue history", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 266, + 417, + 280 + ], + "spans": [ + { + "bbox": [ + 105, + 266, + 417, + 280 + ], + "score": 1.0, + "content": "and attention operation should be separated from the one on dialogue history.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 11, + "bbox_fs": [ + 104, + 199, + 506, + 280 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 221, + 281, + 390, + 316 + ], + "lines": [ + { + "bbox": [ + 221, + 281, + 390, + 316 + ], + "spans": [ + { + "bbox": [ + 221, + 281, + 390, + 316 + ], + "score": 0.92, + "content": "\\begin{array} { r } { A _ { \\mathrm { r e s } } ^ { ( 2 a ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 1 ) } , H , H ) \\in \\mathbb { R } ^ { j \\times d } } \\\\ { A _ { \\mathrm { r e s } } ^ { ( 2 b ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 2 a ) } , Q , Q ) \\in \\mathbb { R } ^ { j \\times d } } \\end{array}", + "type": "interline_equation", + "image_path": "67b6fd4ca874e4b641145983c7d5e1caccd86a85b112bff258860efc295e4c70.jpg" + } + ] + } + ], + "index": 15.5, + "virtual_lines": [ + { + "bbox": [ + 221, + 281, + 390, + 298.5 + ], + "spans": [], + "index": 15 + }, + { + "bbox": [ + 221, + 298.5, + 390, + 316.0 + ], + "spans": [], + "index": 16 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 319, + 504, + 342 + ], + "lines": [ + { + "bbox": [ + 106, + 319, + 506, + 332 + ], + "spans": [ + { + "bbox": [ + 106, + 319, + 506, + 332 + ], + "score": 1.0, + "content": "Alternatively, we simply concatenate dialogue and question embeddings similarly to (Hori et al.,", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 329, + 458, + 342 + ], + "spans": [ + { + "bbox": [ + 106, + 329, + 443, + 342 + ], + "score": 1.0, + "content": "2019; Sanabria et al., 2019) and use it as input to the original attention layer (Model", + "type": "text" + }, + { + "bbox": [ + 443, + 331, + 451, + 340 + ], + "score": 0.57, + "content": "D", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 329, + 458, + 342 + ], + "score": 1.0, + "content": ").", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 17.5, + "bbox_fs": [ + 106, + 319, + 506, + 342 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 206, + 346, + 405, + 362 + ], + "lines": [ + { + "bbox": [ + 206, + 346, + 405, + 362 + ], + "spans": [ + { + "bbox": [ + 206, + 346, + 405, + 362 + ], + "score": 0.88, + "content": "A _ { \\mathrm { r e s } } ^ { ( 2 ) } = \\mathrm { A t t e n t i o n } ( A _ { \\mathrm { r e s } } ^ { ( 1 ) } , [ H ; Q ] , [ H ; Q ] ) \\in \\mathbb { R } ^ { j \\times d }", + "type": "interline_equation", + "image_path": "9807127436c12da449db19c4727e8cd774eaf3bc4bac9d756378aa28cc1fd385.jpg" + } + ] + } + ], + "index": 19, + "virtual_lines": [ + { + "bbox": [ + 206, + 346, + 405, + 362 + ], + "spans": [], + "index": 19 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 366, + 506, + 444 + ], + "lines": [ + { + "bbox": [ + 105, + 366, + 506, + 379 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 506, + 379 + ], + "score": 1.0, + "content": "To use more sophisticated neural models for dialogue understanding, we further adopt the hierarchical", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 378, + 506, + 389 + ], + "spans": [ + { + "bbox": [ + 105, + 378, + 506, + 389 + ], + "score": 1.0, + "content": "encoding architecture with question attention (Li et al., 2016; Serban et al., 2016; Hori et al., 2019).", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 388, + 506, + 401 + ], + "spans": [ + { + "bbox": [ + 105, + 388, + 189, + 401 + ], + "score": 1.0, + "content": "Each dialogue turn", + "type": "text" + }, + { + "bbox": [ + 189, + 389, + 202, + 399 + ], + "score": 0.88, + "content": "\\mathcal { H } _ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 388, + 506, + 401 + ], + "score": 1.0, + "content": ", including a pair of human utterance and system response, is processed", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 399, + 506, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 399, + 324, + 411 + ], + "score": 1.0, + "content": "separately by a word-level RNN such as LSTM (Model", + "type": "text" + }, + { + "bbox": [ + 324, + 400, + 332, + 409 + ], + "score": 0.51, + "content": "E", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 399, + 399, + 411 + ], + "score": 1.0, + "content": ") or GRU (Model", + "type": "text" + }, + { + "bbox": [ + 400, + 400, + 408, + 410 + ], + "score": 0.6, + "content": "F", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 399, + 506, + 411 + ], + "score": 1.0, + "content": "). A sentence-level RNN", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 411, + 506, + 423 + ], + "spans": [ + { + "bbox": [ + 105, + 411, + 506, + 423 + ], + "score": 1.0, + "content": "is used to sequentially process the last hidden states obtained previously turn by turn. The output in", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 421, + 506, + 434 + ], + "spans": [ + { + "bbox": [ + 106, + 421, + 506, + 434 + ], + "score": 1.0, + "content": "each recurrent step is fed to an attention layer such as (Bahdanau et al., 2015; Vaswani et al., 2017) to", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 431, + 340, + 446 + ], + "spans": [ + { + "bbox": [ + 105, + 431, + 340, + 446 + ], + "score": 1.0, + "content": "obtain question-aware representations of dialogue history.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23, + "bbox_fs": [ + 105, + 366, + 506, + 446 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 221, + 447, + 390, + 513 + ], + "lines": [ + { + "bbox": [ + 221, + 447, + 390, + 513 + ], + "spans": [ + { + "bbox": [ + 221, + 447, + 390, + 513 + ], + "score": 0.92, + "content": "\\begin{array} { r l } & { H _ { t } ^ { \\mathrm { w o r d } } = \\mathrm { R N N } ( H _ { t } ) \\in \\mathbb { R } ^ { d } } \\\\ & { H _ { t } ^ { \\mathrm { s e n t } } = \\mathrm { R N N } ( H _ { t } ^ { \\mathrm { w o r d } } ) \\in \\mathbb { R } ^ { d } } \\\\ & { \\qquad H = [ H _ { t } ^ { \\mathrm { s e n t } } ] | _ { t = 1 } ^ { T - 1 } \\in \\mathbb { R } ^ { d \\times ( T - 1 ) } } \\\\ & { Q _ { \\mathrm { c t x } } = \\mathrm { A t t e n t i o n } ( Q , H , H ) \\in \\mathbb { R } ^ { L _ { Q } \\times d } } \\end{array}", + "type": "interline_equation", + "image_path": "6b500eb54336338b23fae1788baf2b04763d7328a4509692dfd78778ea5abe21.jpg" + } + ] + } + ], + "index": 29, + "virtual_lines": [ + { + "bbox": [ + 221, + 447, + 390, + 460.2 + ], + "spans": [], + "index": 27 + }, + { + "bbox": [ + 221, + 460.2, + 390, + 473.4 + ], + "spans": [], + "index": 28 + }, + { + "bbox": [ + 221, + 473.4, + 390, + 486.59999999999997 + ], + "spans": [], + "index": 29 + }, + { + "bbox": [ + 221, + 486.59999999999997, + 390, + 499.79999999999995 + ], + "spans": [], + "index": 30 + }, + { + "bbox": [ + 221, + 499.79999999999995, + 390, + 513.0 + ], + "spans": [], + "index": 31 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 517, + 504, + 540 + ], + "lines": [ + { + "bbox": [ + 105, + 516, + 506, + 531 + ], + "spans": [ + { + "bbox": [ + 105, + 516, + 133, + 531 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 133, + 518, + 142, + 527 + ], + "score": 0.83, + "content": "T", + "type": "inline_equation" + }, + { + "bbox": [ + 142, + 516, + 355, + 531 + ], + "score": 1.0, + "content": "is the current dialogue turn. The output is treated as", + "type": "text" + }, + { + "bbox": [ + 356, + 518, + 376, + 529 + ], + "score": 0.92, + "content": "Q _ { \\mathrm { c t x } }", + "type": "inline_equation" + }, + { + "bbox": [ + 376, + 516, + 506, + 531 + ], + "score": 1.0, + "content": "and is fed to the corresponding", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 528, + 263, + 540 + ], + "spans": [ + { + "bbox": [ + 106, + 528, + 263, + 540 + ], + "score": 1.0, + "content": "attention layer in the response decoder.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 32.5, + "bbox_fs": [ + 105, + 516, + 506, + 540 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 555, + 314, + 568 + ], + "lines": [ + { + "bbox": [ + 105, + 554, + 315, + 570 + ], + "spans": [ + { + "bbox": [ + 105, + 554, + 315, + 570 + ], + "score": 1.0, + "content": "B ADDITIONAL EXPERIMENT DETAILS", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 34 + }, + { + "type": "title", + "bbox": [ + 107, + 580, + 178, + 592 + ], + "lines": [ + { + "bbox": [ + 105, + 580, + 179, + 593 + ], + "spans": [ + { + "bbox": [ + 105, + 580, + 179, + 593 + ], + "score": 1.0, + "content": "B.1 DATASETS", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 106, + 600, + 506, + 711 + ], + "lines": [ + { + "bbox": [ + 105, + 600, + 505, + 614 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 505, + 614 + ], + "score": 1.0, + "content": "We use the AVSD benchmark from DSTC7 (Hori et al., 2019) which consists of dialogues grounded", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 611, + 507, + 626 + ], + "spans": [ + { + "bbox": [ + 105, + 611, + 507, + 626 + ], + "score": 1.0, + "content": "on the Charades videos (Sigurdsson et al., 2016). Each dialogue contains up to 10 dialogue turns,", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 623, + 506, + 636 + ], + "spans": [ + { + "bbox": [ + 106, + 623, + 506, + 636 + ], + "score": 1.0, + "content": "each turn consists of a question and expected response about a given video. For visual features, we", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 634, + 506, + 646 + ], + "spans": [ + { + "bbox": [ + 106, + 634, + 506, + 646 + ], + "score": 1.0, + "content": "use the 3D CNN based features from a pretrained I3D model (Carreira & Zisserman, 2017) and", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 645, + 506, + 658 + ], + "spans": [ + { + "bbox": [ + 105, + 645, + 506, + 658 + ], + "score": 1.0, + "content": "object-level features from a pretrained FasterRNN model (Ren et al., 2015b). The audio features are", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 656, + 506, + 669 + ], + "spans": [ + { + "bbox": [ + 106, + 656, + 506, + 669 + ], + "score": 1.0, + "content": "obtained from a pretrained VGGish model (Hershey et al., 2017). In the experiments with AVSD,", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 667, + 506, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 506, + 680 + ], + "score": 1.0, + "content": "we consider two settings: one with video summary and one without video summary as input. In the", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 678, + 506, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 678, + 506, + 690 + ], + "score": 1.0, + "content": "setting with video summary, the summary is concatenated to the dialogue history before the first", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 688, + 507, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 507, + 702 + ], + "score": 1.0, + "content": "dialogue turn. We also adapt VilNMN to the video QA benchmark TGIF-QA (Jang et al., 2017).", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 700, + 380, + 713 + ], + "spans": [ + { + "bbox": [ + 105, + 700, + 380, + 713 + ], + "score": 1.0, + "content": "Different from AVSD, TGIF-QA contains a diverse set of QA tasks:", + "type": "text" + } + ], + "index": 45 + } + ], + "index": 40.5, + "bbox_fs": [ + 105, + 600, + 507, + 713 + ] + }, + { + "type": "text", + "bbox": [ + 133, + 720, + 447, + 732 + ], + "lines": [ + { + "bbox": [ + 133, + 719, + 448, + 734 + ], + "spans": [ + { + "bbox": [ + 133, + 719, + 448, + 734 + ], + "score": 1.0, + "content": "• Count: open-ended task which counts the number of repetitions of an action", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 133, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 133, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "• Action: multiple-choice (MC) task which asks about a certain action occurring for a fixed", + "type": "text", + "cross_page": true + } + ], + "index": 0 + }, + { + "bbox": [ + 141, + 94, + 210, + 105 + ], + "spans": [ + { + "bbox": [ + 141, + 94, + 210, + 105 + ], + "score": 1.0, + "content": "number of times", + "type": "text", + "cross_page": true + } + ], + "index": 1 + }, + { + "bbox": [ + 132, + 107, + 414, + 120 + ], + "spans": [ + { + "bbox": [ + 132, + 107, + 414, + 120 + ], + "score": 1.0, + "content": "• Transition: MC task which emphasizes temporal transition in video", + "type": "text", + "cross_page": true + } + ], + "index": 2 + }, + { + "bbox": [ + 133, + 122, + 505, + 135 + ], + "spans": [ + { + "bbox": [ + 133, + 122, + 505, + 135 + ], + "score": 1.0, + "content": "• Frame: open-ended task which can be answered from visual contents of one of video frames", + "type": "text", + "cross_page": true + } + ], + "index": 3 + } + ], + "index": 46, + "bbox_fs": [ + 133, + 719, + 448, + 734 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 134, + 82, + 505, + 135 + ], + "lines": [ + { + "bbox": [ + 133, + 82, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 133, + 82, + 505, + 95 + ], + "score": 1.0, + "content": "• Action: multiple-choice (MC) task which asks about a certain action occurring for a fixed", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 141, + 94, + 210, + 105 + ], + "spans": [ + { + "bbox": [ + 141, + 94, + 210, + 105 + ], + "score": 1.0, + "content": "number of times", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 132, + 107, + 414, + 120 + ], + "spans": [ + { + "bbox": [ + 132, + 107, + 414, + 120 + ], + "score": 1.0, + "content": "• Transition: MC task which emphasizes temporal transition in video", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 133, + 122, + 505, + 135 + ], + "spans": [ + { + "bbox": [ + 133, + 122, + 505, + 135 + ], + "score": 1.0, + "content": "• Frame: open-ended task which can be answered from visual contents of one of video frames", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 1.5 + }, + { + "type": "text", + "bbox": [ + 104, + 142, + 505, + 165 + ], + "lines": [ + { + "bbox": [ + 105, + 141, + 506, + 156 + ], + "spans": [ + { + "bbox": [ + 105, + 141, + 506, + 156 + ], + "score": 1.0, + "content": "For the TGIF-QA benchmark, we use the extracted features from a pretrained ResNet model (He", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 153, + 160, + 166 + ], + "spans": [ + { + "bbox": [ + 105, + 153, + 160, + 166 + ], + "score": 1.0, + "content": "et al., 2016).", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5 + }, + { + "type": "table", + "bbox": [ + 190, + 194, + 421, + 278 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 190, + 174, + 420, + 186 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 191, + 174, + 420, + 187 + ], + "spans": [ + { + "bbox": [ + 191, + 174, + 420, + 187 + ], + "score": 1.0, + "content": "Table 5: Summary of DSTC7 AVSD and TGIF-QA benchmark", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "table_body", + "bbox": [ + 190, + 194, + 421, + 278 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 190, + 194, + 421, + 278 + ], + "spans": [ + { + "bbox": [ + 190, + 194, + 421, + 278 + ], + "score": 0.979, + "html": "
#TrainVal.Test
AVSDDialogs7,6591,7871,710
Turns153,18035,74013,490
Words1,450,754339,006110,252
TGIFQACount QA24,1592,6843,554
Action QA18,4282,0472,274
Trans. QA47,4345,2706,232
Frame QA35,4533,93913,691
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Where", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 329, + 505, + 340 + ], + "spans": [ + { + "bbox": [ + 106, + 329, + 505, + 340 + ], + "score": 1.0, + "content": "Transformer attention is used, we fix the number of attention heads to 8 in all attention layers. In", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "score": 1.0, + "content": "neural modules with MLP layers, the MLP network is fixed to 2 linear layers with a ReLU activation", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 351, + 505, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 351, + 505, + 362 + ], + "score": 1.0, + "content": "in between. In neural modules with CNN, we adopt a vanilla CNN architecture for text classification", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 468, + 373 + ], + "score": 1.0, + "content": "(without the last MLP layer) where the number of input channels is 1, the kernel sizes are", + "type": "text" + }, + { + "bbox": [ + 468, + 361, + 502, + 372 + ], + "score": 0.92, + "content": "\\{ 3 , 4 , 5 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 360, + 506, + 373 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 371, + 506, + 384 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 260, + 384 + ], + "score": 1.0, + "content": "and the number of output channels is", + "type": "text" + }, + { + "bbox": [ + 260, + 372, + 267, + 381 + ], + "score": 0.62, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 371, + 506, + 384 + ], + "score": 1.0, + "content": ". We initialize models with uniform distribution (Glorot &", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 381, + 506, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 397 + ], + "score": 1.0, + "content": "Bengio, 2010). During training, we adopt the Adam optimizer (Kingma & Ba, 2015) and a decaying", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 104, + 392, + 506, + 407 + ], + "spans": [ + { + "bbox": [ + 104, + 392, + 506, + 407 + ], + "score": 1.0, + "content": "learning rate Vaswani et al. (2017) where we fix the warm-up steps to 15K training steps. We employ", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "score": 1.0, + "content": "dropout (Srivastava et al., 2014) of 0.2 at all networks except the last linear layers of question parsers", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 416, + 506, + 428 + ], + "spans": [ + { + "bbox": [ + 106, + 416, + 506, + 428 + ], + "score": 1.0, + "content": "and response decoder. We train models up to 50 epochs and select the best models based on the", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 427, + 282, + 439 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 282, + 439 + ], + "score": 1.0, + "content": "average loss per epoch in the validation set.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 19 + }, + { + "type": "title", + "bbox": [ + 108, + 453, + 244, + 466 + ], + "lines": [ + { + "bbox": [ + 106, + 453, + 246, + 468 + ], + "spans": [ + { + "bbox": [ + 106, + 453, + 246, + 468 + ], + "score": 1.0, + "content": "C ADDITIONAL RESULTS", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 478, + 505, + 610 + ], + "lines": [ + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "score": 1.0, + "content": "To evaluate model robustness, we report the relative performance by calculating the difference of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 489, + 506, + 502 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 506, + 502 + ], + "score": 1.0, + "content": "CIDEr in experimental settings against the most basic setting. Specifically, we compare against", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 500, + 504, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 400, + 512 + ], + "score": 1.0, + "content": "performance of output responses in the first dialogue turn position (i.e.", + "type": "text" + }, + { + "bbox": [ + 400, + 500, + 438, + 511 + ], + "score": 0.87, + "content": "2 ^ { n \\dot { d } } – 1 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 500, + 490, + 512 + ], + "score": 1.0, + "content": "turn vs. the", + "type": "text" + }, + { + "bbox": [ + 491, + 500, + 504, + 510 + ], + "score": 0.85, + "content": "1 ^ { s t }", + "type": "inline_equation" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 511, + 506, + 524 + ], + "spans": [ + { + "bbox": [ + 104, + 511, + 475, + 524 + ], + "score": 1.0, + "content": "turn), or responses grounded on the shortest video length range (video ranges are intervals of", + "type": "text" + }, + { + "bbox": [ + 475, + 511, + 502, + 522 + ], + "score": 0.89, + "content": "0 – 1 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 511, + 506, + 524 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 521, + 506, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 522, + 139, + 533 + ], + "score": 0.9, + "content": "1 0 \\ – 2 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 139, + 521, + 506, + 535 + ], + "score": 1.0, + "content": "percentile and so on). We report the results of the model variants A, B, and E (See the", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "score": 1.0, + "content": "Ablation Analysis section in the main paper and Appendix A.3 for model description). First, as can", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 544, + 506, + 558 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 506, + 558 + ], + "score": 1.0, + "content": "be seen in Figure 7, for various dialogue turn positions, we observe that the original VilNMN (model", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 555, + 506, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 555, + 393, + 568 + ], + "score": 1.0, + "content": "A) suffers less than model E when dialogues extend over time up the", + "type": "text" + }, + { + "bbox": [ + 393, + 555, + 407, + 565 + ], + "score": 0.89, + "content": "8 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 555, + 506, + 568 + ], + "score": 1.0, + "content": "turn. This explains the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 565, + 506, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 506, + 579 + ], + "score": 1.0, + "content": "contribution of dialogue understanding modules in solving entities even when the dialogues grow", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 577, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 106, + 577, + 505, + 589 + ], + "score": 1.0, + "content": "longer. Secondly, as compared to model B, we observe that the Full VilNMN (model A) is less", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 587, + 506, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 587, + 506, + 601 + ], + "score": 1.0, + "content": "affected as the videos grounding the dialogues grow longer. The difference is clear when the video", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 600, + 244, + 611 + ], + "spans": [ + { + "bbox": [ + 106, + 600, + 244, + 611 + ], + "score": 1.0, + "content": "length increases up to 33 seconds.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 31.5 + }, + { + "type": "text", + "bbox": [ + 107, + 616, + 505, + 693 + ], + "lines": [ + { + "bbox": [ + 106, + 616, + 505, + 628 + ], + "spans": [ + { + "bbox": [ + 106, + 616, + 505, + 628 + ], + "score": 1.0, + "content": "We also report the absolute scores and compare model variants. In Table 6a, we compare model", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 627, + 506, + 639 + ], + "spans": [ + { + "bbox": [ + 106, + 627, + 506, + 639 + ], + "score": 1.0, + "content": "variants B and E. We observe that model B generally performs better than model E in overall,", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 636, + 507, + 652 + ], + "spans": [ + { + "bbox": [ + 104, + 636, + 304, + 652 + ], + "score": 1.0, + "content": "especially in higher turn positions, i.e. from the", + "type": "text" + }, + { + "bbox": [ + 305, + 637, + 320, + 648 + ], + "score": 0.87, + "content": "4 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 636, + 351, + 652 + ], + "score": 1.0, + "content": "turn to", + "type": "text" + }, + { + "bbox": [ + 351, + 637, + 365, + 648 + ], + "score": 0.87, + "content": "8 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 636, + 507, + 652 + ], + "score": 1.0, + "content": "turn. Interestingly, we note some", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 104, + 647, + 507, + 662 + ], + "spans": [ + { + "bbox": [ + 104, + 647, + 302, + 662 + ], + "score": 1.0, + "content": "mixed results in very low turn position, i.e. the", + "type": "text" + }, + { + "bbox": [ + 302, + 648, + 318, + 659 + ], + "score": 0.87, + "content": "2 ^ { n d }", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 647, + 336, + 662 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 337, + 648, + 352, + 659 + ], + "score": 0.88, + "content": "3 ^ { r d }", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 647, + 507, + 662 + ], + "score": 1.0, + "content": "turn, and very high turn position, i.e.", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 658, + 506, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 658, + 121, + 673 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 122, + 659, + 140, + 670 + ], + "score": 0.9, + "content": "1 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 658, + 506, + 673 + ], + "score": 1.0, + "content": "turn. Potentially, in very high turn position, the neural based approach such as hierarchical", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 670, + 506, + 684 + ], + "spans": [ + { + "bbox": [ + 105, + 670, + 506, + 684 + ], + "score": 1.0, + "content": "RNN can better capture the global dependencies within dialogue context than the entity-based", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 682, + 226, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 682, + 226, + 694 + ], + "score": 1.0, + "content": "compositional NMN method.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 41 + }, + { + "type": "text", + "bbox": [ + 108, + 699, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "In Table 6b, we compare model variants A and B. We note that the performance gap between model", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "score": 1.0, + "content": "A and B is quite distinct, with 7/10 cases of video ranges in which model A outperforms. However,", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "score": 1.0, + "content": "similarly to our prior observations in experiments by dialogue turn, in lower ranges (i.e. 1-23", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 46 + } + ], + "page_idx": 15, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 107, + 27, + 307, + 37 + ], + "lines": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "spans": [ + { + "bbox": [ + 106, + 26, + 308, + 38 + ], + "score": 1.0, + "content": "Under review as a conference paper at ICLR 2021", + "type": "text" + } + ] + } + ] + }, + { + "type": "discarded", + "bbox": [ + 300, + 752, + 310, + 760 + ], + "lines": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "spans": [ + { + "bbox": [ + 299, + 750, + 312, + 764 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 14, + "width": 13 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 134, + 82, + 505, + 135 + ], + "lines": [], + "index": 1.5, + "bbox_fs": [ + 132, + 82, + 505, + 135 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 104, + 142, + 505, + 165 + ], + "lines": [ + { + "bbox": [ + 105, + 141, + 506, + 156 + ], + "spans": [ + { + "bbox": [ + 105, + 141, + 506, + 156 + ], + "score": 1.0, + "content": "For the TGIF-QA benchmark, we use the extracted features from a pretrained ResNet model (He", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 153, + 160, + 166 + ], + "spans": [ + { + "bbox": [ + 105, + 153, + 160, + 166 + ], + "score": 1.0, + "content": "et al., 2016).", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5, + "bbox_fs": [ + 105, + 141, + 506, + 166 + ] + }, + { + "type": "table", + "bbox": [ + 190, + 194, + 421, + 278 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 190, + 174, + 420, + 186 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 191, + 174, + 420, + 187 + ], + "spans": [ + { + "bbox": [ + 191, + 174, + 420, + 187 + ], + "score": 1.0, + "content": "Table 5: Summary of DSTC7 AVSD and TGIF-QA benchmark", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 6 + }, + { + "type": "table_body", + "bbox": [ + 190, + 194, + 421, + 278 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 190, + 194, + 421, + 278 + ], + "spans": [ + { + "bbox": [ + 190, + 194, + 421, + 278 + ], + "score": 0.979, + "html": "
#TrainVal.Test
AVSDDialogs7,6591,7871,710
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Where", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 329, + 505, + 340 + ], + "spans": [ + { + "bbox": [ + 106, + 329, + 505, + 340 + ], + "score": 1.0, + "content": "Transformer attention is used, we fix the number of attention heads to 8 in all attention layers. In", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "spans": [ + { + "bbox": [ + 106, + 339, + 505, + 351 + ], + "score": 1.0, + "content": "neural modules with MLP layers, the MLP network is fixed to 2 linear layers with a ReLU activation", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 351, + 505, + 362 + ], + "spans": [ + { + "bbox": [ + 106, + 351, + 505, + 362 + ], + "score": 1.0, + "content": "in between. In neural modules with CNN, we adopt a vanilla CNN architecture for text classification", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 360, + 506, + 373 + ], + "spans": [ + { + "bbox": [ + 105, + 360, + 468, + 373 + ], + "score": 1.0, + "content": "(without the last MLP layer) where the number of input channels is 1, the kernel sizes are", + "type": "text" + }, + { + "bbox": [ + 468, + 361, + 502, + 372 + ], + "score": 0.92, + "content": "\\{ 3 , 4 , 5 \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 360, + 506, + 373 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 371, + 506, + 384 + ], + "spans": [ + { + "bbox": [ + 105, + 371, + 260, + 384 + ], + "score": 1.0, + "content": "and the number of output channels is", + "type": "text" + }, + { + "bbox": [ + 260, + 372, + 267, + 381 + ], + "score": 0.62, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 267, + 371, + 506, + 384 + ], + "score": 1.0, + "content": ". We initialize models with uniform distribution (Glorot &", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 381, + 506, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 381, + 506, + 397 + ], + "score": 1.0, + "content": "Bengio, 2010). During training, we adopt the Adam optimizer (Kingma & Ba, 2015) and a decaying", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 104, + 392, + 506, + 407 + ], + "spans": [ + { + "bbox": [ + 104, + 392, + 506, + 407 + ], + "score": 1.0, + "content": "learning rate Vaswani et al. (2017) where we fix the warm-up steps to 15K training steps. We employ", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "spans": [ + { + "bbox": [ + 106, + 405, + 505, + 417 + ], + "score": 1.0, + "content": "dropout (Srivastava et al., 2014) of 0.2 at all networks except the last linear layers of question parsers", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 416, + 506, + 428 + ], + "spans": [ + { + "bbox": [ + 106, + 416, + 506, + 428 + ], + "score": 1.0, + "content": "and response decoder. We train models up to 50 epochs and select the best models based on the", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 427, + 282, + 439 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 282, + 439 + ], + "score": 1.0, + "content": "average loss per epoch in the validation set.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 19, + "bbox_fs": [ + 104, + 317, + 506, + 439 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 453, + 244, + 466 + ], + "lines": [ + { + "bbox": [ + 106, + 453, + 246, + 468 + ], + "spans": [ + { + "bbox": [ + 106, + 453, + 246, + 468 + ], + "score": 1.0, + "content": "C ADDITIONAL RESULTS", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 106, + 478, + 505, + 610 + ], + "lines": [ + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "spans": [ + { + "bbox": [ + 105, + 478, + 506, + 491 + ], + "score": 1.0, + "content": "To evaluate model robustness, we report the relative performance by calculating the difference of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 489, + 506, + 502 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 506, + 502 + ], + "score": 1.0, + "content": "CIDEr in experimental settings against the most basic setting. Specifically, we compare against", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 500, + 504, + 512 + ], + "spans": [ + { + "bbox": [ + 105, + 500, + 400, + 512 + ], + "score": 1.0, + "content": "performance of output responses in the first dialogue turn position (i.e.", + "type": "text" + }, + { + "bbox": [ + 400, + 500, + 438, + 511 + ], + "score": 0.87, + "content": "2 ^ { n \\dot { d } } – 1 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 500, + 490, + 512 + ], + "score": 1.0, + "content": "turn vs. the", + "type": "text" + }, + { + "bbox": [ + 491, + 500, + 504, + 510 + ], + "score": 0.85, + "content": "1 ^ { s t }", + "type": "inline_equation" + } + ], + "index": 28 + }, + { + "bbox": [ + 104, + 511, + 506, + 524 + ], + "spans": [ + { + "bbox": [ + 104, + 511, + 475, + 524 + ], + "score": 1.0, + "content": "turn), or responses grounded on the shortest video length range (video ranges are intervals of", + "type": "text" + }, + { + "bbox": [ + 475, + 511, + 502, + 522 + ], + "score": 0.89, + "content": "0 – 1 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 511, + 506, + 524 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 106, + 521, + 506, + 535 + ], + "spans": [ + { + "bbox": [ + 106, + 522, + 139, + 533 + ], + "score": 0.9, + "content": "1 0 \\ – 2 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 139, + 521, + 506, + 535 + ], + "score": 1.0, + "content": "percentile and so on). We report the results of the model variants A, B, and E (See the", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 532, + 505, + 546 + ], + "score": 1.0, + "content": "Ablation Analysis section in the main paper and Appendix A.3 for model description). First, as can", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 544, + 506, + 558 + ], + "spans": [ + { + "bbox": [ + 105, + 544, + 506, + 558 + ], + "score": 1.0, + "content": "be seen in Figure 7, for various dialogue turn positions, we observe that the original VilNMN (model", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 555, + 506, + 568 + ], + "spans": [ + { + "bbox": [ + 105, + 555, + 393, + 568 + ], + "score": 1.0, + "content": "A) suffers less than model E when dialogues extend over time up the", + "type": "text" + }, + { + "bbox": [ + 393, + 555, + 407, + 565 + ], + "score": 0.89, + "content": "8 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 555, + 506, + 568 + ], + "score": 1.0, + "content": "turn. This explains the", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 565, + 506, + 579 + ], + "spans": [ + { + "bbox": [ + 105, + 565, + 506, + 579 + ], + "score": 1.0, + "content": "contribution of dialogue understanding modules in solving entities even when the dialogues grow", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 577, + 505, + 589 + ], + "spans": [ + { + "bbox": [ + 106, + 577, + 505, + 589 + ], + "score": 1.0, + "content": "longer. Secondly, as compared to model B, we observe that the Full VilNMN (model A) is less", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 587, + 506, + 601 + ], + "spans": [ + { + "bbox": [ + 105, + 587, + 506, + 601 + ], + "score": 1.0, + "content": "affected as the videos grounding the dialogues grow longer. The difference is clear when the video", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 600, + 244, + 611 + ], + "spans": [ + { + "bbox": [ + 106, + 600, + 244, + 611 + ], + "score": 1.0, + "content": "length increases up to 33 seconds.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 31.5, + "bbox_fs": [ + 104, + 478, + 506, + 611 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 616, + 505, + 693 + ], + "lines": [ + { + "bbox": [ + 106, + 616, + 505, + 628 + ], + "spans": [ + { + "bbox": [ + 106, + 616, + 505, + 628 + ], + "score": 1.0, + "content": "We also report the absolute scores and compare model variants. In Table 6a, we compare model", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 627, + 506, + 639 + ], + "spans": [ + { + "bbox": [ + 106, + 627, + 506, + 639 + ], + "score": 1.0, + "content": "variants B and E. We observe that model B generally performs better than model E in overall,", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 104, + 636, + 507, + 652 + ], + "spans": [ + { + "bbox": [ + 104, + 636, + 304, + 652 + ], + "score": 1.0, + "content": "especially in higher turn positions, i.e. from the", + "type": "text" + }, + { + "bbox": [ + 305, + 637, + 320, + 648 + ], + "score": 0.87, + "content": "4 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 320, + 636, + 351, + 652 + ], + "score": 1.0, + "content": "turn to", + "type": "text" + }, + { + "bbox": [ + 351, + 637, + 365, + 648 + ], + "score": 0.87, + "content": "8 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 636, + 507, + 652 + ], + "score": 1.0, + "content": "turn. Interestingly, we note some", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 104, + 647, + 507, + 662 + ], + "spans": [ + { + "bbox": [ + 104, + 647, + 302, + 662 + ], + "score": 1.0, + "content": "mixed results in very low turn position, i.e. the", + "type": "text" + }, + { + "bbox": [ + 302, + 648, + 318, + 659 + ], + "score": 0.87, + "content": "2 ^ { n d }", + "type": "inline_equation" + }, + { + "bbox": [ + 318, + 647, + 336, + 662 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 337, + 648, + 352, + 659 + ], + "score": 0.88, + "content": "3 ^ { r d }", + "type": "inline_equation" + }, + { + "bbox": [ + 352, + 647, + 507, + 662 + ], + "score": 1.0, + "content": "turn, and very high turn position, i.e.", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 658, + 506, + 673 + ], + "spans": [ + { + "bbox": [ + 105, + 658, + 121, + 673 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 122, + 659, + 140, + 670 + ], + "score": 0.9, + "content": "1 0 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 658, + 506, + 673 + ], + "score": 1.0, + "content": "turn. Potentially, in very high turn position, the neural based approach such as hierarchical", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 670, + 506, + 684 + ], + "spans": [ + { + "bbox": [ + 105, + 670, + 506, + 684 + ], + "score": 1.0, + "content": "RNN can better capture the global dependencies within dialogue context than the entity-based", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 682, + 226, + 694 + ], + "spans": [ + { + "bbox": [ + 105, + 682, + 226, + 694 + ], + "score": 1.0, + "content": "compositional NMN method.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 41, + "bbox_fs": [ + 104, + 616, + 507, + 694 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 699, + 505, + 732 + ], + "lines": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "In Table 6b, we compare model variants A and B. We note that the performance gap between model", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "score": 1.0, + "content": "A and B is quite distinct, with 7/10 cases of video ranges in which model A outperforms. However,", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "spans": [ + { + "bbox": [ + 105, + 721, + 505, + 733 + ], + "score": 1.0, + "content": "similarly to our prior observations in experiments by dialogue turn, in lower ranges (i.e. 1-23", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "spans": [ + { + "bbox": [ + 106, + 677, + 505, + 689 + ], + "score": 1.0, + "content": "seconds) and higher ranges (37-75 seconds), model A performs not as well as model B. There are", + "type": "text", + "cross_page": true + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 686, + 505, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 686, + 505, + 701 + ], + "score": 1.0, + "content": "additional factors that we will need to examine further to explain the results, such as the complexity", + "type": "text", + "cross_page": true + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "of the questions for these short and long-range videos. Potentially, our question parser for video", + "type": "text", + "cross_page": true + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 708, + 506, + 723 + ], + "score": 1.0, + "content": "understanding program needs more sophisticated composition method to retrieve information from", + "type": "text", + "cross_page": true + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 719, + 185, + 734 + ], + "spans": [ + { + "bbox": [ + 105, + 719, + 185, + 734 + ], + "score": 1.0, + "content": "these video ranges.", + "type": "text", + "cross_page": true + } + ], + "index": 20 + } + ], + "index": 46, + "bbox_fs": [ + 105, + 699, + 506, + 733 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 111, + 82, + 499, + 219 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 111, + 82, + 499, + 219 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 111, + 82, + 499, + 219 + ], + "spans": [ + { + "bbox": [ + 111, + 82, + 499, + 219 + ], + "score": 0.966, + "type": "image", + "image_path": "398de27efc81f7e3642d1abc7c7b4de47175198fb1e45e3f27e2fc1e430a106c.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 111, + 82, + 499, + 127.66666666666666 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 111, + 127.66666666666666, + 499, + 173.33333333333331 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 111, + 173.33333333333331, + 499, + 218.99999999999997 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 106, + 232, + 505, + 273 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 106, + 232, + 505, + 244 + ], + "spans": [ + { + "bbox": [ + 106, + 232, + 505, + 244 + ], + "score": 1.0, + "content": "Figure 7: Performance of model variants A, B, and E, by dialogue turn position and video length. The", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 243, + 505, + 254 + ], + "spans": [ + { + "bbox": [ + 105, + 243, + 505, + 254 + ], + "score": 1.0, + "content": "performance is calculated relatively to performance of the most basic setting, i.e. responses of the first dialogue", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 251, + 505, + 265 + ], + "spans": [ + { + "bbox": [ + 105, + 251, + 122, + 265 + ], + "score": 1.0, + "content": "turn", + "type": "text" + }, + { + "bbox": [ + 123, + 253, + 295, + 263 + ], + "score": 0.89, + "content": "\\Delta \\mathrm { C I D E r _ { t u r n \\_ i } } = \\mathrm { C I D E r _ { t u r n \\_ i } } - \\mathrm { C I D E r _ { t u r n \\_ 1 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 296, + 251, + 505, + 265 + ], + "score": 1.0, + "content": ", or responses grounding on the lowest video range (0 to 23", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 261, + 321, + 276 + ], + "spans": [ + { + "bbox": [ + 105, + 261, + 140, + 276 + ], + "score": 1.0, + "content": "seconds)", + "type": "text" + }, + { + "bbox": [ + 141, + 263, + 317, + 274 + ], + "score": 0.77, + "content": "\\Delta \\mathrm { C I D E r _ { r a n g e \\mathrm { _ i } } } = \\mathrm { C I D E r _ { r a n g e \\mathrm { _ i } } } - \\mathrm { C I D E r _ { 0 - 2 3 } }", + "type": "inline_equation" + }, + { + "bbox": [ + 317, + 261, + 321, + 276 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 4.5 + } + ], + "index": 2.75 + }, + { + "type": "table", + "bbox": [ + 173, + 336, + 434, + 471 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 205, + 301, + 406, + 312 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 204, + 301, + 407, + 312 + ], + "spans": [ + { + "bbox": [ + 204, + 301, + 407, + 312 + ], + "score": 1.0, + "content": "Table 6: Performance breakdown in BLEU4 and CIDEr", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 7 + }, + { + "type": "table_caption", + "bbox": [ + 209, + 321, + 402, + 332 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 208, + 320, + 403, + 333 + ], + "spans": [ + { + "bbox": [ + 208, + 320, + 403, + 333 + ], + "score": 1.0, + "content": "(a) by dialogue turn between model variants B and E.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 8 + }, + { + "type": "table_body", + "bbox": [ + 173, + 336, + 434, + 471 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 173, + 336, + 434, + 471 + ], + "spans": [ + { + "bbox": [ + 173, + 336, + 434, + 471 + ], + "score": 0.981, + "html": "
BLEU4CIDEr
turn positionModel BModel EModel BModel E
10.5790.5871.6231.650
20.4290.4301.1551.142
30.2750.2890.8670.846
40.3090.3050.8590.855
50.3550.3351.0881.023
60.3570.3291.0440.950
70.3420.3250.8960.847
80.3610.3321.0250.973
90.3830.4311.0431.182
100.3950.3710.9310.977
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BLEU4CIDEr
video range (seconds)Model AModel BModel AModel B
1-230.4320.4471.2981.355
23-280.4360.4331.2641.165
28-300.3980.3761.2031.164
30-30.60.4410.4181.2201.202
30.6-310.4130.4111.2501.166
31-31.60.4390.4511.2491.295
31.6-320.4300.4191.2171.192
32-330.4680.4451.3431.237
33-370.3880.3811.1491.124
37-750.3560.3650.9100.962
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There are", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 686, + 505, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 686, + 505, + 701 + ], + "score": 1.0, + "content": "additional factors that we will need to examine further to explain the results, such as the complexity", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "spans": [ + { + "bbox": [ + 106, + 699, + 505, + 711 + ], + "score": 1.0, + "content": "of the questions for these short and long-range videos. 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BLEU4CIDEr
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20.4290.4301.1551.142
30.2750.2890.8670.846
40.3090.3050.8590.855
50.3550.3351.0881.023
60.3570.3291.0440.950
70.3420.3250.8960.847
80.3610.3321.0250.973
90.3830.4311.0431.182
100.3950.3710.9310.977
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BLEU4CIDEr
video range (seconds)Model AModel BModel AModel B
1-230.4320.4471.2981.355
23-280.4360.4331.2641.165
28-300.3980.3761.2031.164
30-30.60.4410.4181.2201.202
30.6-310.4130.4111.2501.166
31-31.60.4390.4511.2491.295
31.6-320.4300.4191.2171.192
32-330.4680.4451.3431.237
33-370.3880.3811.1491.124
37-750.3560.3650.9100.962
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For example, in the", + "type": "text" + }, + { + "bbox": [ + 422, + 185, + 437, + 196 + ], + "score": 0.88, + "content": "3 ^ { r d }", + "type": "inline_equation" + }, + { + "bbox": [ + 437, + 185, + 506, + 198 + ], + "score": 1.0, + "content": "turn in Figure 8,", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 142, + 197, + 505, + 209 + ], + "spans": [ + { + "bbox": [ + 142, + 197, + 505, + 209 + ], + "score": 1.0, + "content": "the output response describes a room because the predicted video program focuses on the", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 141, + 208, + 505, + 220 + ], + "spans": [ + { + "bbox": [ + 141, + 208, + 505, + 220 + ], + "score": 1.0, + "content": "entity “what room” instead of the entity “an object” in the question. Another example is", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 140, + 217, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 140, + 217, + 156, + 233 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 157, + 218, + 172, + 229 + ], + "score": 0.88, + "content": "3 ^ { \\dot { r } d }", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 217, + 506, + 233 + ], + "score": 1.0, + "content": "turn in Figure 10 where the entity “rooftop” is missing in the video program. These", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 141, + 230, + 505, + 243 + ], + "spans": [ + { + "bbox": [ + 141, + 230, + 505, + 243 + ], + "score": 1.0, + "content": "mismatches can deviate the information retrieved from the video during video program", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 141, + 241, + 437, + 253 + ], + "spans": [ + { + "bbox": [ + 141, + 241, + 437, + 253 + ], + "score": 1.0, + "content": "execution, leading to wrong output responses with wrong visual contents.", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 138, + 255, + 506, + 269 + ], + "spans": [ + { + "bbox": [ + 138, + 255, + 506, + 269 + ], + "score": 1.0, + "content": "We also note that in some cases, one or both of the predicted programs are incorrect, but the", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 141, + 267, + 506, + 279 + ], + "spans": [ + { + "bbox": [ + 141, + 267, + 506, + 279 + ], + "score": 1.0, + "content": "predicted responses still match the ground-truth responses. This might be explained as the", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 140, + 277, + 506, + 291 + ], + "spans": [ + { + "bbox": [ + 140, + 277, + 506, + 291 + ], + "score": 1.0, + "content": "predicted module parameters are not exactly the same as the ground truth but they are close", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 140, + 286, + 506, + 302 + ], + "spans": [ + { + "bbox": [ + 140, + 286, + 194, + 302 + ], + "score": 1.0, + "content": "enough (e.g.", + "type": "text" + }, + { + "bbox": [ + 194, + 288, + 209, + 299 + ], + "score": 0.86, + "content": "4 ^ { t h }", + "type": "inline_equation" + }, + { + "bbox": [ + 209, + 286, + 506, + 302 + ], + "score": 1.0, + "content": "turn in Figure 8). Sometimes, our model predicted programs that are more", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 140, + 298, + 506, + 313 + ], + "spans": [ + { + "bbox": [ + 140, + 298, + 365, + 313 + ], + "score": 1.0, + "content": "appropriate than the ground truth. For example, in the", + "type": "text" + }, + { + "bbox": [ + 366, + 299, + 382, + 310 + ], + "score": 0.87, + "content": "2 ^ { { \\bar { n } } d }", + "type": "inline_equation" + }, + { + "bbox": [ + 382, + 298, + 506, + 313 + ], + "score": 1.0, + "content": "turn in Figure 9, the program", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 141, + 311, + 505, + 323 + ], + "spans": [ + { + "bbox": [ + 141, + 311, + 505, + 323 + ], + "score": 1.0, + "content": "is added with a where module parameterized by the entity “the shopping bag” which was", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 141, + 321, + 386, + 334 + ], + "spans": [ + { + "bbox": [ + 141, + 321, + 386, + 334 + ], + "score": 1.0, + "content": "solved from the reference “them” mentioned in the question.", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 136, + 335, + 506, + 350 + ], + "spans": [ + { + "bbox": [ + 136, + 335, + 470, + 350 + ], + "score": 1.0, + "content": "• We observe that for complex questions that involve more than one queries (e.g. the", + "type": "text" + }, + { + "bbox": [ + 471, + 335, + 485, + 347 + ], + "score": 0.87, + "content": "3 ^ { r d }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 335, + 506, + 350 + ], + "score": 1.0, + "content": "turn", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 141, + 347, + 505, + 361 + ], + "spans": [ + { + "bbox": [ + 141, + 347, + 505, + 361 + ], + "score": 1.0, + "content": "in Figure 10), it becomes more challenging to decode an appropriate video understanding", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 140, + 358, + 385, + 371 + ], + "spans": [ + { + "bbox": [ + 140, + 358, + 385, + 371 + ], + "score": 1.0, + "content": "program and generate responses that can address all queries.", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 135, + 372, + 505, + 385 + ], + "spans": [ + { + "bbox": [ + 135, + 372, + 505, + 385 + ], + "score": 1.0, + "content": "• In Figure 11, we demonstrate some output examples of VilNMN and compare with two", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 141, + 384, + 505, + 396 + ], + "spans": [ + { + "bbox": [ + 141, + 384, + 505, + 396 + ], + "score": 1.0, + "content": "baselines: Baseline (Hori et al., 2019) and MTN (Le et al., 2019b). We noted that VilNMN", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 141, + 396, + 505, + 407 + ], + "spans": [ + { + "bbox": [ + 141, + 396, + 505, + 407 + ], + "score": 1.0, + "content": "can include important entities relevant to the current dialogue turn to construct output", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 141, + 407, + 505, + 419 + ], + "spans": [ + { + "bbox": [ + 141, + 407, + 505, + 419 + ], + "score": 1.0, + "content": "responses while other models might miss some entity details, e.g. “them/dishes” in example", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 141, + 417, + 505, + 429 + ], + "spans": [ + { + "bbox": [ + 141, + 417, + 505, + 429 + ], + "score": 1.0, + "content": "A and “the magazine” in example B. 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Another example is", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 140, + 217, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 140, + 217, + 156, + 233 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 157, + 218, + 172, + 229 + ], + "score": 0.88, + "content": "3 ^ { \\dot { r } d }", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 217, + 506, + 233 + ], + "score": 1.0, + "content": "turn in Figure 10 where the entity “rooftop” is missing in the video program. 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TurnQuestionDialogue UnderstandingProgramVideo UnderstandingProgramResponse
1hi how many peopleare in the video fromstart to finish ?Predicted: summari ze()Gold: summarize ()Predicted: describe (how manypeople)Gold:describe (how manypeople)Predicted: there are twopeople in the video.Gold: hello,there aretwo men
2are they carrying ona conversationbetween themselves?Predicted:find(they)→summarize()Gold:find(they),find(themselves)→summarize()Predicted: where(two men in the←video)→when(carrying on aconversation betweenthemselves)-exist()Gold:where(two men)→ when(carrying a conversationbetween themselves)-exist()Predicted: yes,they arecarrying a conversation×Gold: no,backgroundnoise is birdsong andshuffling noises
3what are they doingin the scene ?arethey on a rooftop ?Predicted: find(they),find(the scene)→summarize() ×Gold: find(they)→summarize()Predicted:where(two men in thevideo),where(the scene)→when(doing in the scene)→describe(what) ×Gold: where(two men),where(rooftop)→when(doingin the scene)-describe(what)Predicted: one iswashing a chair and theother is taking pictures×Gold: yes,on a secondfloor roof deck ,oneman is washing a chair,another man is eitherfilming or taking pictures
4does he sit in thechair after washingit?Predicted: find(he),find(the chair)→summarize()Gold: find (he),find(the chair)→summarize()Predicted: where(one man in thevideo),where(a chair)→when(sit in the chair afterwashing it)→exist()Gold:where(one man),where(achair)→ when(sit in thechair after washing it)→exist()Predicted: no,he doesnot sit in the chairGold: no he does not,there is a pipe withwater running all over
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TurnQuestionDialogue UnderstandingProgramVideo UnderstandingProgramResponse
1hi how many peopleare in the video fromstart to finish ?Predicted: summari ze()Gold: summarize ()Predicted: describe (how manypeople)Gold:describe (how manypeople)Predicted: there are twopeople in the video.Gold: hello,there aretwo men
2are they carrying ona conversationbetween themselves?Predicted:find(they)→summarize()Gold:find(they),find(themselves)→summarize()Predicted: where(two men in the←video)→when(carrying on aconversation betweenthemselves)-exist()Gold:where(two men)→ when(carrying a conversationbetween themselves)-exist()Predicted: yes,they arecarrying a conversation×Gold: no,backgroundnoise is birdsong andshuffling noises
3what are they doingin the scene ?arethey on a rooftop ?Predicted: find(they),find(the scene)→summarize() ×Gold: find(they)→summarize()Predicted:where(two men in thevideo),where(the scene)→when(doing in the scene)→describe(what) ×Gold: where(two men),where(rooftop)→when(doingin the scene)-describe(what)Predicted: one iswashing a chair and theother is taking pictures×Gold: yes,on a secondfloor roof deck ,oneman is washing a chair,another man is eitherfilming or taking pictures
4does he sit in thechair after washingit?Predicted: find(he),find(the chair)→summarize()Gold: find (he),find(the chair)→summarize()Predicted: where(one man in thevideo),where(a chair)→when(sit in the chair afterwashing it)→exist()Gold:where(one man),where(achair)→ when(sit in thechair after washing it)→exist()Predicted: no,he doesnot sit in the chairGold: no he does not,there is a pipe withwater running all over
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Consequently, machine learning on graphs is an active research area", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 546, + 507, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 546, + 507, + 561 + ], + "score": 1.0, + "content": "with numerous proposed approaches—notably GNNs [21, 42, 45] being the most representative case of", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 106, + 559, + 167, + 570 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 167, + 570 + ], + "score": 1.0, + "content": "GRL methods.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30, + "bbox_fs": [ + 105, + 515, + 507, + 570 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 575, + 505, + 684 + ], + "lines": [ + { + "bbox": [ + 106, + 576, + 505, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 576, + 505, + 587 + ], + "score": 1.0, + "content": "Arguably, GRL’s most interesting results arise from a cross-over between graph theory and representation", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 587, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 505, + 598 + ], + "score": 1.0, + "content": "learning. For instance, the representational limits of GNNs are upper-bounded by a simple heuristic", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 597, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 597, + 506, + 609 + ], + "score": 1.0, + "content": "for the graph isomorphism problem [78, 105], the 1-dimensional Weisfeiler-Leman algorithm (1-", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 607, + 506, + 620 + ], + "spans": [ + { + "bbox": [ + 106, + 607, + 506, + 620 + ], + "score": 1.0, + "content": "WL) [44, 73, 75, 101, 102], which might miss crucial structural information in the data [5]. Further", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 619, + 505, + 631 + ], + "spans": [ + { + "bbox": [ + 106, + 619, + 505, + 631 + ], + "score": 1.0, + "content": "works show how GNNs cannot approximate graph properties such as diameter, radius, girth, and subgraph", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 630, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 106, + 630, + 444, + 642 + ], + "score": 1.0, + "content": "counts [25, 38], inspiring architectures [6, 66, 77, 78] based on the more powerful", + "type": "text" + }, + { + "bbox": [ + 445, + 631, + 452, + 640 + ], + "score": 0.77, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 630, + 506, + 642 + ], + "score": 1.0, + "content": "-dimensional", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 640, + 506, + 653 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 223, + 653 + ], + "score": 1.0, + "content": "Weisfeiler-Leman algorithm (", + "type": "text" + }, + { + "bbox": [ + 223, + 642, + 230, + 651 + ], + "score": 0.53, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 230, + 640, + 506, + 653 + ], + "score": 1.0, + "content": "-WL) [44].1 On the other hand, despite the limited expressiveness of", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 650, + 507, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 650, + 507, + 665 + ], + "score": 1.0, + "content": "GNNs, they still can overfit the training data, offering limited generalization performance [105]. Hence,", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 105, + 662, + 505, + 676 + ], + "spans": [ + { + "bbox": [ + 105, + 662, + 505, + 676 + ], + "score": 1.0, + "content": "devising GRL architectures that are simultaneously sufficiently expressive and avoid overfitting remains", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 673, + 178, + 686 + ], + "spans": [ + { + "bbox": [ + 105, + 673, + 178, + 686 + ], + "score": 1.0, + "content": "an open problem.", + "type": "text" + } + ], + "index": 42 + } + ], + "index": 37.5, + "bbox_fs": [ + 105, + 576, + 507, + 686 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 72, + 505, + 171 + ], + "lines": [ + { + "bbox": [ + 105, + 73, + 506, + 86 + ], + "spans": [ + { + "bbox": [ + 105, + 73, + 506, + 86 + ], + "score": 1.0, + "content": "An under-explored connection between graph theory and GRL is graph reconstruction, which studies", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 84, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 84, + 506, + 96 + ], + "score": 1.0, + "content": "graphs and graph properties uniquely determined by their subgraphs. In this direction, both the", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 94, + 506, + 108 + ], + "spans": [ + { + "bbox": [ + 105, + 94, + 506, + 108 + ], + "score": 1.0, + "content": "pioneering work of Shawe-Taylor [88] and the more recent work of Bouritsas et al. [18], show that", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "score": 1.0, + "content": "assuming the reconstruction conjecture (see Conjecture 1) holds, their models are most-expressive", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 117, + 506, + 130 + ], + "spans": [ + { + "bbox": [ + 105, + 117, + 506, + 130 + ], + "score": 1.0, + "content": "representations (universal approximators) of graphs. Unfortunately, Shawe-Taylor’s computational", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 127, + 506, + 141 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 506, + 141 + ], + "score": 1.0, + "content": "graph grows exponentially with the number of vertices, and Bouritsas et al.’s full representation power", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 138, + 506, + 151 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 443, + 151 + ], + "score": 1.0, + "content": "requires performing multiple graph isomorphism tests on potentially large graphs (with", + "type": "text" + }, + { + "bbox": [ + 443, + 138, + 468, + 149 + ], + "score": 0.88, + "content": "n - 1", + "type": "inline_equation" + }, + { + "bbox": [ + 468, + 138, + 506, + 151 + ], + "score": 1.0, + "content": "vertices).", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 147, + 507, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 147, + 507, + 163 + ], + "score": 1.0, + "content": "Moreover, these methods were not inspired by the more general subject of graph reconstruction; instead,", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 160, + 464, + 173 + ], + "spans": [ + { + "bbox": [ + 106, + 160, + 464, + 173 + ], + "score": 1.0, + "content": "they rely on the reconstruction conjecture to prove their architecture’s expressive powers.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 4 + }, + { + "type": "text", + "bbox": [ + 107, + 176, + 505, + 275 + ], + "lines": [ + { + "bbox": [ + 106, + 176, + 505, + 189 + ], + "spans": [ + { + "bbox": [ + 106, + 176, + 505, + 189 + ], + "score": 1.0, + "content": "Contributions. In this work, we directly connect graph reconstruction to GRL. We first show how", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 186, + 505, + 200 + ], + "spans": [ + { + "bbox": [ + 105, + 186, + 121, + 200 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 121, + 188, + 128, + 197 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 128, + 186, + 350, + 200 + ], + "score": 1.0, + "content": "-reconstruction of graphs—reconstruction from induced", + "type": "text" + }, + { + "bbox": [ + 351, + 188, + 357, + 198 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 186, + 505, + 200 + ], + "score": 1.0, + "content": "-vertex subgraphs—induces a natural", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 198, + 506, + 211 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 434, + 211 + ], + "score": 1.0, + "content": "class of expressive GRL architectures for supervised learning with graphs, denoted", + "type": "text" + }, + { + "bbox": [ + 434, + 199, + 441, + 208 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 198, + 506, + 211 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 208, + 505, + 222 + ], + "spans": [ + { + "bbox": [ + 105, + 208, + 505, + 222 + ], + "score": 1.0, + "content": "Neural Networks. We then show how several existing works have their expressive power limited by", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 220, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 106, + 221, + 113, + 230 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 220, + 506, + 233 + ], + "score": 1.0, + "content": "-reconstruction. Further, we show how the reconstruction conjecture’s insights lead to a provably", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 231, + 506, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 506, + 243 + ], + "score": 1.0, + "content": "most expressive representation of graphs. Unlike Shawe-Taylor [88] and Bouritsas et al. [18], which,", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 242, + 507, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 507, + 255 + ], + "score": 1.0, + "content": "for graph tasks, require fixed-size unattributed graphs and multiple (large) graph isomorphism tests,", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 253, + 506, + 266 + ], + "spans": [ + { + "bbox": [ + 105, + 253, + 506, + 266 + ], + "score": 1.0, + "content": "respectively, our method represents bounded-size graphs with vertex attributes and does not rely on", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 264, + 184, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 264, + 184, + 277 + ], + "score": 1.0, + "content": "isomorphism tests.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 13 + }, + { + "type": "text", + "bbox": [ + 107, + 280, + 505, + 400 + ], + "lines": [ + { + "bbox": [ + 105, + 280, + 505, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 280, + 278, + 293 + ], + "score": 1.0, + "content": "To make our models scalable, we propose", + "type": "text" + }, + { + "bbox": [ + 278, + 281, + 285, + 290 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 280, + 505, + 293 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, a general tool for boosting the", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 291, + 505, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 505, + 304 + ], + "score": 1.0, + "content": "expressive power and performance of GNNs with graph reconstruction. Theoretically, we characterize", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 302, + 505, + 314 + ], + "spans": [ + { + "bbox": [ + 105, + 302, + 253, + 314 + ], + "score": 1.0, + "content": "their expressive power showing that", + "type": "text" + }, + { + "bbox": [ + 253, + 302, + 260, + 312 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 302, + 505, + 314 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish graph classes that the", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 312, + 505, + 326 + ], + "spans": [ + { + "bbox": [ + 105, + 312, + 505, + 326 + ], + "score": 1.0, + "content": "1-WL and 2-WL cannot, such as cycle graphs and strongly regular graphs, respectively. Further, to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 325, + 505, + 336 + ], + "spans": [ + { + "bbox": [ + 106, + 325, + 505, + 336 + ], + "score": 1.0, + "content": "explain gains in real-world tasks, we show how reconstruction can act as a lower-variance risk estimator", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "score": 1.0, + "content": "when the graph-generating distribution is invariant to vertex removals. Empirically, we show that", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "score": 1.0, + "content": "reconstruction enhances GNNs’ expressive power, making them solve multiple synthetic graph property", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 356, + 505, + 369 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 505, + 369 + ], + "score": 1.0, + "content": "tasks in the literature not solvable by the original GNN. On real-world datasets, we show that the", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 366, + 505, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 505, + 380 + ], + "score": 1.0, + "content": "increase in expressive power coupled with the lower-variance risk estimator boosts GNNs’ performance", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 378, + 506, + 391 + ], + "spans": [ + { + "bbox": [ + 105, + 378, + 128, + 391 + ], + "score": 1.0, + "content": "up to", + "type": "text" + }, + { + "bbox": [ + 128, + 378, + 147, + 389 + ], + "score": 0.87, + "content": "2 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 378, + 506, + 391 + ], + "score": 1.0, + "content": ". Our combined theoretical and empirical results make another important connection between", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 389, + 202, + 401 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 202, + 401 + ], + "score": 1.0, + "content": "graph theory and GRL.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 23 + }, + { + "type": "title", + "bbox": [ + 107, + 420, + 187, + 432 + ], + "lines": [ + { + "bbox": [ + 106, + 420, + 189, + 433 + ], + "spans": [ + { + "bbox": [ + 106, + 420, + 189, + 433 + ], + "score": 1.0, + "content": "1.1 Related work", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 107, + 443, + 504, + 466 + ], + "lines": [ + { + "bbox": [ + 106, + 442, + 505, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 442, + 505, + 456 + ], + "score": 1.0, + "content": "We review related work from GNNs, their limitations, data augmentation, and the reconstruction", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 454, + 412, + 467 + ], + "spans": [ + { + "bbox": [ + 105, + 454, + 412, + 467 + ], + "score": 1.0, + "content": "conjecture in the following. See Appendix A for a more detailed discussion.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30.5 + }, + { + "type": "text", + "bbox": [ + 107, + 470, + 505, + 514 + ], + "lines": [ + { + "bbox": [ + 106, + 470, + 505, + 483 + ], + "spans": [ + { + "bbox": [ + 106, + 470, + 505, + 483 + ], + "score": 1.0, + "content": "GNNs. Notable instances of this architecture include, e.g., [31, 47, 97], and the spectral approaches", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 481, + 507, + 494 + ], + "spans": [ + { + "bbox": [ + 105, + 481, + 507, + 494 + ], + "score": 1.0, + "content": "proposed in, e.g., [19, 30, 56, 72]—all of which descend from early work in [10, 57, 69, 70, 71, 87, 90].", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "Aligned with the field’s recent rise in popularity, there exists a plethora of surveys on recent advances in", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 503, + 383, + 515 + ], + "spans": [ + { + "bbox": [ + 106, + 503, + 383, + 515 + ], + "score": 1.0, + "content": "GNN methods. Some of the most recent ones include [21, 104, 114].", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 33.5 + }, + { + "type": "text", + "bbox": [ + 106, + 520, + 505, + 651 + ], + "lines": [ + { + "bbox": [ + 104, + 519, + 506, + 533 + ], + "spans": [ + { + "bbox": [ + 104, + 519, + 506, + 533 + ], + "score": 1.0, + "content": "Limits of GNNs. Recently, connections to Weisfeiler-Leman type algorithms have been shown [9,", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 530, + 506, + 543 + ], + "spans": [ + { + "bbox": [ + 105, + 530, + 506, + 543 + ], + "score": 1.0, + "content": "27, 39, 40, 64, 66, 77, 78, 105]. Specifically, the authors of [78, 105] show how the 1-WL limits the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 542, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 420, + 554 + ], + "score": 1.0, + "content": "expressive power of any possible GNN architecture. Morris et al. [78] introduce", + "type": "text" + }, + { + "bbox": [ + 420, + 543, + 427, + 551 + ], + "score": 0.68, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 427, + 542, + 505, + 554 + ], + "score": 1.0, + "content": "-dimensional GNNs", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 552, + 506, + 566 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 469, + 566 + ], + "score": 1.0, + "content": "which rely on a more expressive message-passing scheme between subgraphs of cardinality", + "type": "text" + }, + { + "bbox": [ + 469, + 554, + 477, + 563 + ], + "score": 0.67, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 552, + 506, + 566 + ], + "score": 1.0, + "content": ". Later,", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 563, + 506, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 563, + 447, + 577 + ], + "score": 1.0, + "content": "this was refined in [6, 66] and in [76] by deriving models equivalent to the more powerful", + "type": "text" + }, + { + "bbox": [ + 447, + 565, + 454, + 574 + ], + "score": 0.79, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 455, + 563, + 506, + 577 + ], + "score": 1.0, + "content": "-dimensional", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 574, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 574, + 506, + 587 + ], + "score": 1.0, + "content": "Weisfeiler-Leman algorithm. Chen et al. [27] connect the theory of universal approximation of", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 585, + 506, + 597 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 506, + 597 + ], + "score": 1.0, + "content": "permutation-invariant functions and graph isomorphism testing, further introducing a variation of the 2-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "WL. Recently, a large body of work propose enhancements to GNNs, e.g., see [3, 11, 14, 18, 80, 98, 109],", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 608, + 505, + 619 + ], + "spans": [ + { + "bbox": [ + 106, + 608, + 505, + 619 + ], + "score": 1.0, + "content": "making them more powerful than the 1-WL; see [75] for a survey and see Appendix A for a in-depth", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 617, + 506, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 617, + 506, + 631 + ], + "score": 1.0, + "content": "discussion. For clarity, throughout this work, we will use the term GNNs to denote the class of", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 628, + 506, + 643 + ], + "spans": [ + { + "bbox": [ + 105, + 628, + 506, + 643 + ], + "score": 1.0, + "content": "message-passing architectures limited by the 1-WL algorithm, where the class of distinguishable graphs", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 640, + 199, + 652 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 199, + 652 + ], + "score": 1.0, + "content": "is well understood [5].", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 41.5 + }, + { + "type": "text", + "bbox": [ + 107, + 656, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 105, + 655, + 505, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 505, + 668 + ], + "score": 1.0, + "content": "Data augmentation, generalization and subgraph-based inductive biases. There exist few works", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 667, + 505, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 505, + 680 + ], + "score": 1.0, + "content": "proposing data augmentation for GNNs for graph classification. Kong et al. [59] introduces a simple", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 677, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 691 + ], + "score": 1.0, + "content": "feature perturbation framework to achieve this, while Rong et al. [85], Feng et al. [34] focus on", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 689, + 506, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 689, + 506, + 702 + ], + "score": 1.0, + "content": "vertex-level tasks. Garg et al. [38] study the generalization abilities of GNNs showing bounds on the", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 700, + 506, + 713 + ], + "spans": [ + { + "bbox": [ + 105, + 700, + 506, + 713 + ], + "score": 1.0, + "content": "Rademacher complexity, while Liao et al. [62] offer a refined analysis within the PAC-Bayes framework.", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 711, + 507, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 711, + 507, + 723 + ], + "score": 1.0, + "content": "Recently, Bouritsas et al. [18] proposed to use subgraph counts as vertex and edge features in GNNs.", + "type": "text" + } + ], + "index": 53 + } + ], + "index": 50.5 + } + ], + "page_idx": 1, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 302, + 742, + 309, + 750 + ], + "lines": [ + { + "bbox": [ + 301, + 741, + 310, + 753 + ], + "spans": [ + { + "bbox": [ + 301, + 741, + 310, + 753 + ], + "score": 1.0, + "content": "2", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 72, + 505, + 171 + ], + "lines": [ + { + "bbox": [ + 105, + 73, + 506, + 86 + ], + "spans": [ + { + "bbox": [ + 105, + 73, + 506, + 86 + ], + "score": 1.0, + "content": "An under-explored connection between graph theory and GRL is graph reconstruction, which studies", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 84, + 506, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 84, + 506, + 96 + ], + "score": 1.0, + "content": "graphs and graph properties uniquely determined by their subgraphs. In this direction, both the", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 94, + 506, + 108 + ], + "spans": [ + { + "bbox": [ + 105, + 94, + 506, + 108 + ], + "score": 1.0, + "content": "pioneering work of Shawe-Taylor [88] and the more recent work of Bouritsas et al. [18], show that", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "spans": [ + { + "bbox": [ + 105, + 105, + 505, + 118 + ], + "score": 1.0, + "content": "assuming the reconstruction conjecture (see Conjecture 1) holds, their models are most-expressive", + "type": "text" + } + ], + "index": 3 + }, + { + "bbox": [ + 105, + 117, + 506, + 130 + ], + "spans": [ + { + "bbox": [ + 105, + 117, + 506, + 130 + ], + "score": 1.0, + "content": "representations (universal approximators) of graphs. Unfortunately, Shawe-Taylor’s computational", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 127, + 506, + 141 + ], + "spans": [ + { + "bbox": [ + 105, + 127, + 506, + 141 + ], + "score": 1.0, + "content": "graph grows exponentially with the number of vertices, and Bouritsas et al.’s full representation power", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 138, + 506, + 151 + ], + "spans": [ + { + "bbox": [ + 105, + 138, + 443, + 151 + ], + "score": 1.0, + "content": "requires performing multiple graph isomorphism tests on potentially large graphs (with", + "type": "text" + }, + { + "bbox": [ + 443, + 138, + 468, + 149 + ], + "score": 0.88, + "content": "n - 1", + "type": "inline_equation" + }, + { + "bbox": [ + 468, + 138, + 506, + 151 + ], + "score": 1.0, + "content": "vertices).", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 147, + 507, + 163 + ], + "spans": [ + { + "bbox": [ + 105, + 147, + 507, + 163 + ], + "score": 1.0, + "content": "Moreover, these methods were not inspired by the more general subject of graph reconstruction; instead,", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 160, + 464, + 173 + ], + "spans": [ + { + "bbox": [ + 106, + 160, + 464, + 173 + ], + "score": 1.0, + "content": "they rely on the reconstruction conjecture to prove their architecture’s expressive powers.", + "type": "text" + } + ], + "index": 8 + } + ], + "index": 4, + "bbox_fs": [ + 105, + 73, + 507, + 173 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 176, + 505, + 275 + ], + "lines": [ + { + "bbox": [ + 106, + 176, + 505, + 189 + ], + "spans": [ + { + "bbox": [ + 106, + 176, + 505, + 189 + ], + "score": 1.0, + "content": "Contributions. In this work, we directly connect graph reconstruction to GRL. We first show how", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 186, + 505, + 200 + ], + "spans": [ + { + "bbox": [ + 105, + 186, + 121, + 200 + ], + "score": 1.0, + "content": "the", + "type": "text" + }, + { + "bbox": [ + 121, + 188, + 128, + 197 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 128, + 186, + 350, + 200 + ], + "score": 1.0, + "content": "-reconstruction of graphs—reconstruction from induced", + "type": "text" + }, + { + "bbox": [ + 351, + 188, + 357, + 198 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 358, + 186, + 505, + 200 + ], + "score": 1.0, + "content": "-vertex subgraphs—induces a natural", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 198, + 506, + 211 + ], + "spans": [ + { + "bbox": [ + 105, + 198, + 434, + 211 + ], + "score": 1.0, + "content": "class of expressive GRL architectures for supervised learning with graphs, denoted", + "type": "text" + }, + { + "bbox": [ + 434, + 199, + 441, + 208 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 198, + 506, + 211 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 208, + 505, + 222 + ], + "spans": [ + { + "bbox": [ + 105, + 208, + 505, + 222 + ], + "score": 1.0, + "content": "Neural Networks. We then show how several existing works have their expressive power limited by", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 220, + 506, + 233 + ], + "spans": [ + { + "bbox": [ + 106, + 221, + 113, + 230 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 220, + 506, + 233 + ], + "score": 1.0, + "content": "-reconstruction. Further, we show how the reconstruction conjecture’s insights lead to a provably", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 231, + 506, + 243 + ], + "spans": [ + { + "bbox": [ + 105, + 231, + 506, + 243 + ], + "score": 1.0, + "content": "most expressive representation of graphs. Unlike Shawe-Taylor [88] and Bouritsas et al. [18], which,", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 242, + 507, + 255 + ], + "spans": [ + { + "bbox": [ + 105, + 242, + 507, + 255 + ], + "score": 1.0, + "content": "for graph tasks, require fixed-size unattributed graphs and multiple (large) graph isomorphism tests,", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 253, + 506, + 266 + ], + "spans": [ + { + "bbox": [ + 105, + 253, + 506, + 266 + ], + "score": 1.0, + "content": "respectively, our method represents bounded-size graphs with vertex attributes and does not rely on", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 264, + 184, + 277 + ], + "spans": [ + { + "bbox": [ + 106, + 264, + 184, + 277 + ], + "score": 1.0, + "content": "isomorphism tests.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 13, + "bbox_fs": [ + 105, + 176, + 507, + 277 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 280, + 505, + 400 + ], + "lines": [ + { + "bbox": [ + 105, + 280, + 505, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 280, + 278, + 293 + ], + "score": 1.0, + "content": "To make our models scalable, we propose", + "type": "text" + }, + { + "bbox": [ + 278, + 281, + 285, + 290 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 280, + 505, + 293 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, a general tool for boosting the", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 291, + 505, + 304 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 505, + 304 + ], + "score": 1.0, + "content": "expressive power and performance of GNNs with graph reconstruction. Theoretically, we characterize", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 302, + 505, + 314 + ], + "spans": [ + { + "bbox": [ + 105, + 302, + 253, + 314 + ], + "score": 1.0, + "content": "their expressive power showing that", + "type": "text" + }, + { + "bbox": [ + 253, + 302, + 260, + 312 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 261, + 302, + 505, + 314 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish graph classes that the", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 312, + 505, + 326 + ], + "spans": [ + { + "bbox": [ + 105, + 312, + 505, + 326 + ], + "score": 1.0, + "content": "1-WL and 2-WL cannot, such as cycle graphs and strongly regular graphs, respectively. Further, to", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 325, + 505, + 336 + ], + "spans": [ + { + "bbox": [ + 106, + 325, + 505, + 336 + ], + "score": 1.0, + "content": "explain gains in real-world tasks, we show how reconstruction can act as a lower-variance risk estimator", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "spans": [ + { + "bbox": [ + 105, + 335, + 506, + 347 + ], + "score": 1.0, + "content": "when the graph-generating distribution is invariant to vertex removals. Empirically, we show that", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 105, + 345, + 505, + 358 + ], + "score": 1.0, + "content": "reconstruction enhances GNNs’ expressive power, making them solve multiple synthetic graph property", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 356, + 505, + 369 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 505, + 369 + ], + "score": 1.0, + "content": "tasks in the literature not solvable by the original GNN. On real-world datasets, we show that the", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 366, + 505, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 505, + 380 + ], + "score": 1.0, + "content": "increase in expressive power coupled with the lower-variance risk estimator boosts GNNs’ performance", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 378, + 506, + 391 + ], + "spans": [ + { + "bbox": [ + 105, + 378, + 128, + 391 + ], + "score": 1.0, + "content": "up to", + "type": "text" + }, + { + "bbox": [ + 128, + 378, + 147, + 389 + ], + "score": 0.87, + "content": "2 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 147, + 378, + 506, + 391 + ], + "score": 1.0, + "content": ". Our combined theoretical and empirical results make another important connection between", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 389, + 202, + 401 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 202, + 401 + ], + "score": 1.0, + "content": "graph theory and GRL.", + "type": "text" + } + ], + "index": 28 + } + ], + "index": 23, + "bbox_fs": [ + 105, + 280, + 506, + 401 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 420, + 187, + 432 + ], + "lines": [ + { + "bbox": [ + 106, + 420, + 189, + 433 + ], + "spans": [ + { + "bbox": [ + 106, + 420, + 189, + 433 + ], + "score": 1.0, + "content": "1.1 Related work", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 107, + 443, + 504, + 466 + ], + "lines": [ + { + "bbox": [ + 106, + 442, + 505, + 456 + ], + "spans": [ + { + "bbox": [ + 106, + 442, + 505, + 456 + ], + "score": 1.0, + "content": "We review related work from GNNs, their limitations, data augmentation, and the reconstruction", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 454, + 412, + 467 + ], + "spans": [ + { + "bbox": [ + 105, + 454, + 412, + 467 + ], + "score": 1.0, + "content": "conjecture in the following. See Appendix A for a more detailed discussion.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 30.5, + "bbox_fs": [ + 105, + 442, + 505, + 467 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 470, + 505, + 514 + ], + "lines": [ + { + "bbox": [ + 106, + 470, + 505, + 483 + ], + "spans": [ + { + "bbox": [ + 106, + 470, + 505, + 483 + ], + "score": 1.0, + "content": "GNNs. Notable instances of this architecture include, e.g., [31, 47, 97], and the spectral approaches", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 481, + 507, + 494 + ], + "spans": [ + { + "bbox": [ + 105, + 481, + 507, + 494 + ], + "score": 1.0, + "content": "proposed in, e.g., [19, 30, 56, 72]—all of which descend from early work in [10, 57, 69, 70, 71, 87, 90].", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "spans": [ + { + "bbox": [ + 105, + 492, + 506, + 505 + ], + "score": 1.0, + "content": "Aligned with the field’s recent rise in popularity, there exists a plethora of surveys on recent advances in", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 503, + 383, + 515 + ], + "spans": [ + { + "bbox": [ + 106, + 503, + 383, + 515 + ], + "score": 1.0, + "content": "GNN methods. Some of the most recent ones include [21, 104, 114].", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 33.5, + "bbox_fs": [ + 105, + 470, + 507, + 515 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 520, + 505, + 651 + ], + "lines": [ + { + "bbox": [ + 104, + 519, + 506, + 533 + ], + "spans": [ + { + "bbox": [ + 104, + 519, + 506, + 533 + ], + "score": 1.0, + "content": "Limits of GNNs. Recently, connections to Weisfeiler-Leman type algorithms have been shown [9,", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 530, + 506, + 543 + ], + "spans": [ + { + "bbox": [ + 105, + 530, + 506, + 543 + ], + "score": 1.0, + "content": "27, 39, 40, 64, 66, 77, 78, 105]. Specifically, the authors of [78, 105] show how the 1-WL limits the", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 542, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 542, + 420, + 554 + ], + "score": 1.0, + "content": "expressive power of any possible GNN architecture. Morris et al. [78] introduce", + "type": "text" + }, + { + "bbox": [ + 420, + 543, + 427, + 551 + ], + "score": 0.68, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 427, + 542, + 505, + 554 + ], + "score": 1.0, + "content": "-dimensional GNNs", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 552, + 506, + 566 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 469, + 566 + ], + "score": 1.0, + "content": "which rely on a more expressive message-passing scheme between subgraphs of cardinality", + "type": "text" + }, + { + "bbox": [ + 469, + 554, + 477, + 563 + ], + "score": 0.67, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 477, + 552, + 506, + 566 + ], + "score": 1.0, + "content": ". Later,", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 563, + 506, + 577 + ], + "spans": [ + { + "bbox": [ + 105, + 563, + 447, + 577 + ], + "score": 1.0, + "content": "this was refined in [6, 66] and in [76] by deriving models equivalent to the more powerful", + "type": "text" + }, + { + "bbox": [ + 447, + 565, + 454, + 574 + ], + "score": 0.79, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 455, + 563, + 506, + 577 + ], + "score": 1.0, + "content": "-dimensional", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 574, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 574, + 506, + 587 + ], + "score": 1.0, + "content": "Weisfeiler-Leman algorithm. Chen et al. [27] connect the theory of universal approximation of", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 585, + 506, + 597 + ], + "spans": [ + { + "bbox": [ + 105, + 585, + 506, + 597 + ], + "score": 1.0, + "content": "permutation-invariant functions and graph isomorphism testing, further introducing a variation of the 2-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "WL. Recently, a large body of work propose enhancements to GNNs, e.g., see [3, 11, 14, 18, 80, 98, 109],", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 608, + 505, + 619 + ], + "spans": [ + { + "bbox": [ + 106, + 608, + 505, + 619 + ], + "score": 1.0, + "content": "making them more powerful than the 1-WL; see [75] for a survey and see Appendix A for a in-depth", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 617, + 506, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 617, + 506, + 631 + ], + "score": 1.0, + "content": "discussion. For clarity, throughout this work, we will use the term GNNs to denote the class of", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 628, + 506, + 643 + ], + "spans": [ + { + "bbox": [ + 105, + 628, + 506, + 643 + ], + "score": 1.0, + "content": "message-passing architectures limited by the 1-WL algorithm, where the class of distinguishable graphs", + "type": "text" + } + ], + "index": 46 + }, + { + "bbox": [ + 105, + 640, + 199, + 652 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 199, + 652 + ], + "score": 1.0, + "content": "is well understood [5].", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 41.5, + "bbox_fs": [ + 104, + 519, + 506, + 652 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 656, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 105, + 655, + 505, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 505, + 668 + ], + "score": 1.0, + "content": "Data augmentation, generalization and subgraph-based inductive biases. There exist few works", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 667, + 505, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 505, + 680 + ], + "score": 1.0, + "content": "proposing data augmentation for GNNs for graph classification. Kong et al. [59] introduces a simple", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 677, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 506, + 691 + ], + "score": 1.0, + "content": "feature perturbation framework to achieve this, while Rong et al. [85], Feng et al. [34] focus on", + "type": "text" + } + ], + "index": 50 + }, + { + "bbox": [ + 105, + 689, + 506, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 689, + 506, + 702 + ], + "score": 1.0, + "content": "vertex-level tasks. Garg et al. [38] study the generalization abilities of GNNs showing bounds on the", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 105, + 700, + 506, + 713 + ], + "spans": [ + { + "bbox": [ + 105, + 700, + 506, + 713 + ], + "score": 1.0, + "content": "Rademacher complexity, while Liao et al. [62] offer a refined analysis within the PAC-Bayes framework.", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 105, + 711, + 507, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 711, + 507, + 723 + ], + "score": 1.0, + "content": "Recently, Bouritsas et al. [18] proposed to use subgraph counts as vertex and edge features in GNNs.", + "type": "text" + } + ], + "index": 53 + } + ], + "index": 50.5, + "bbox_fs": [ + 105, + 655, + 507, + 723 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "image", + "bbox": [ + 175, + 0, + 435, + 122 + ], + "blocks": [ + { + "type": "image_body", + "bbox": [ + 175, + 0, + 435, + 122 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 175, + 0, + 435, + 122 + ], + "spans": [ + { + "bbox": [ + 175, + 0, + 435, + 122 + ], + "score": 0.19, + "type": "image", + "image_path": "dca081efcdea705c93b7b98b692adfc66ee28516f8f4a81b121c6c24cf78495d.jpg" + } + ] + } + ], + "index": 1, + "virtual_lines": [ + { + "bbox": [ + 175, + 0, + 435, + 40.666666666666664 + ], + "spans": [], + "index": 0 + }, + { + "bbox": [ + 175, + 40.666666666666664, + 435, + 81.33333333333333 + ], + "spans": [], + "index": 1 + }, + { + "bbox": [ + 175, + 81.33333333333333, + 435, + 122.0 + ], + "spans": [], + "index": 2 + } + ] + }, + { + "type": "image_caption", + "bbox": [ + 122, + 123, + 486, + 134 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 124, + 121, + 486, + 135 + ], + "spans": [ + { + "bbox": [ + 124, + 121, + 192, + 135 + ], + "score": 1.0, + "content": "Figure 1: A graph", + "type": "text" + }, + { + "bbox": [ + 192, + 123, + 201, + 132 + ], + "score": 0.77, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 201, + 121, + 246, + 135 + ], + "score": 1.0, + "content": "and its deck", + "type": "text" + }, + { + "bbox": [ + 247, + 123, + 284, + 133 + ], + "score": 0.92, + "content": "{ \\mathcal { D } } _ { n - 1 } ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 121, + 486, + 135 + ], + "score": 1.0, + "content": ", faded out vertices are not part of each card in the deck.", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 3 + } + ], + "index": 2.0 + }, + { + "type": "text", + "bbox": [ + 106, + 155, + 505, + 232 + ], + "lines": [ + { + "bbox": [ + 105, + 155, + 506, + 169 + ], + "spans": [ + { + "bbox": [ + 105, + 155, + 506, + 169 + ], + "score": 1.0, + "content": "Although the authors show an increase in expressiveness, the extent, e.g., which graph classes their", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 167, + 505, + 180 + ], + "spans": [ + { + "bbox": [ + 105, + 167, + 505, + 180 + ], + "score": 1.0, + "content": "model can distinguish, is still mostly unclear. Moreover, Yehudai et al. [107] investigate GNNs’ ability", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 177, + 506, + 191 + ], + "spans": [ + { + "bbox": [ + 104, + 177, + 506, + 191 + ], + "score": 1.0, + "content": "to generalize to larger graphs. Concurrently, Bevilacqua et al. [12] show how subgraph densities can", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 189, + 505, + 201 + ], + "spans": [ + { + "bbox": [ + 105, + 189, + 505, + 201 + ], + "score": 1.0, + "content": "be used to build size-invariant graph representations. However, the performance of such models in", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 200, + 505, + 211 + ], + "spans": [ + { + "bbox": [ + 106, + 200, + 505, + 211 + ], + "score": 1.0, + "content": "in-distribution tasks, their expressiveness, and scalability remain unclear. Finally, Yuan et al. [111]", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 210, + 506, + 223 + ], + "spans": [ + { + "bbox": [ + 105, + 210, + 506, + 223 + ], + "score": 1.0, + "content": "show how GNNs’ decisions can be explained by (often large) subgraphs, further motivating our use of", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 222, + 344, + 233 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 344, + 233 + ], + "score": 1.0, + "content": "graph reconstruction as a powerful inductive bias for GRL.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 7 + }, + { + "type": "text", + "bbox": [ + 106, + 237, + 505, + 315 + ], + "lines": [ + { + "bbox": [ + 106, + 238, + 505, + 250 + ], + "spans": [ + { + "bbox": [ + 106, + 238, + 505, + 250 + ], + "score": 1.0, + "content": "Reconstruction conjecture. The reconstruction conjecture is a longstanding open problem in graph", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 248, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 248, + 506, + 261 + ], + "score": 1.0, + "content": "theory, which has been solved in many particular settings. Such results come in two flavors. Either", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 259, + 506, + 273 + ], + "spans": [ + { + "bbox": [ + 105, + 259, + 506, + 273 + ], + "score": 1.0, + "content": "proving that graphs from a specific class are reconstructible or determining which graph functions are", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 271, + 506, + 283 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 506, + 283 + ], + "score": 1.0, + "content": "reconstructible. Known results of the former are, for instance, that regular graphs, disconnected graphs,", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 281, + 505, + 294 + ], + "spans": [ + { + "bbox": [ + 106, + 281, + 505, + 294 + ], + "score": 1.0, + "content": "and trees are reconstructible [16, 53]. In particular, we highlight that outerplanar graphs, which account", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 291, + 505, + 306 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 505, + 306 + ], + "score": 1.0, + "content": "for most molecule graphs, are known to be reconstructible [41]. For a comprehensive review of graph", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 304, + 263, + 316 + ], + "spans": [ + { + "bbox": [ + 105, + 304, + 263, + 316 + ], + "score": 1.0, + "content": "reconstruction results, see Bondy [16].", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 14 + }, + { + "type": "title", + "bbox": [ + 107, + 331, + 195, + 344 + ], + "lines": [ + { + "bbox": [ + 104, + 329, + 196, + 347 + ], + "spans": [ + { + "bbox": [ + 104, + 329, + 196, + 347 + ], + "score": 1.0, + "content": "2 Preliminaries", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 107, + 357, + 505, + 379 + ], + "lines": [ + { + "bbox": [ + 106, + 357, + 505, + 369 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 505, + 369 + ], + "score": 1.0, + "content": "Here, we introduce notation and give an overview of the main results in graph reconstruction theory [16,", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 367, + 503, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 503, + 380 + ], + "score": 1.0, + "content": "43], including the reconstruction conjecture [96], which forms the basis of the models in this work.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19.5 + }, + { + "type": "text", + "bbox": [ + 107, + 383, + 506, + 461 + ], + "lines": [ + { + "bbox": [ + 105, + 383, + 506, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 383, + 270, + 397 + ], + "score": 1.0, + "content": "Notation and definitions. As usual, let", + "type": "text" + }, + { + "bbox": [ + 270, + 384, + 362, + 396 + ], + "score": 0.91, + "content": "[ n ] = \\left\\{ 1 , \\dots , n \\right\\} \\subset \\mathbb { N }", + "type": "inline_equation" + }, + { + "bbox": [ + 363, + 383, + 378, + 397 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 378, + 385, + 405, + 395 + ], + "score": 0.9, + "content": "n \\geq 1", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 383, + 439, + 397 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 439, + 384, + 467, + 396 + ], + "score": 0.91, + "content": "\\mathbb { f } \\dots \\mathbb { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 467, + 383, + 506, + 397 + ], + "score": 1.0, + "content": "denote a", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 394, + 506, + 408 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 273, + 408 + ], + "score": 1.0, + "content": "multiset. In an abuse of notation, for a set", + "type": "text" + }, + { + "bbox": [ + 273, + 396, + 284, + 405 + ], + "score": 0.82, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 394, + 304, + 408 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 305, + 397, + 312, + 405 + ], + "score": 0.8, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 394, + 323, + 408 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 324, + 396, + 333, + 405 + ], + "score": 0.82, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 394, + 392, + 408 + ], + "score": 1.0, + "content": ", we denote by", + "type": "text" + }, + { + "bbox": [ + 393, + 396, + 421, + 406 + ], + "score": 0.9, + "content": "X - x", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 394, + 450, + 408 + ], + "score": 1.0, + "content": "the set", + "type": "text" + }, + { + "bbox": [ + 450, + 395, + 485, + 407 + ], + "score": 0.92, + "content": "X { \\bar { \\backslash } } \\left\\{ x \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 394, + 506, + 408 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "score": 1.0, + "content": "also assume elementary definitions from graph theory, such as graphs, directed graphs, vertices, edges,", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 417, + 504, + 429 + ], + "spans": [ + { + "bbox": [ + 106, + 417, + 495, + 429 + ], + "score": 1.0, + "content": "neighbors, trees, isomorphism, et cetera; see Appendix B. The vertex and the edge set of a graph", + "type": "text" + }, + { + "bbox": [ + 495, + 417, + 504, + 427 + ], + "score": 0.78, + "content": "G", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 427, + 507, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 166, + 441 + ], + "score": 1.0, + "content": "are denoted by", + "type": "text" + }, + { + "bbox": [ + 166, + 428, + 191, + 440 + ], + "score": 0.92, + "content": "V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 427, + 209, + 441 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 209, + 428, + 233, + 440 + ], + "score": 0.92, + "content": "E ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 427, + 365, + 441 + ], + "score": 1.0, + "content": ", respectively. The size of a graph", + "type": "text" + }, + { + "bbox": [ + 365, + 428, + 374, + 438 + ], + "score": 0.81, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 427, + 507, + 441 + ], + "score": 1.0, + "content": "is equal to its number of vertices.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 438, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 245, + 452 + ], + "score": 1.0, + "content": "Unless indicated otherwise, we use", + "type": "text" + }, + { + "bbox": [ + 246, + 439, + 298, + 451 + ], + "score": 0.93, + "content": "n : = | V ( G ) |", + "type": "inline_equation" + }, + { + "bbox": [ + 298, + 438, + 506, + 452 + ], + "score": 1.0, + "content": ". If not otherwise stated, we assume that vertices and", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 450, + 341, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 341, + 462 + ], + "score": 1.0, + "content": "edges are annoted with attributes, i.e., real-valued vectors.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 24 + }, + { + "type": "text", + "bbox": [ + 107, + 465, + 505, + 522 + ], + "lines": [ + { + "bbox": [ + 105, + 465, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 465, + 305, + 479 + ], + "score": 1.0, + "content": "We denote the set of all finite and simple graphs by", + "type": "text" + }, + { + "bbox": [ + 306, + 466, + 313, + 477 + ], + "score": 0.79, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 465, + 371, + 479 + ], + "score": 1.0, + "content": ". The subset of", + "type": "text" + }, + { + "bbox": [ + 372, + 466, + 379, + 477 + ], + "score": 0.85, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 465, + 505, + 479 + ], + "score": 1.0, + "content": "without edge attributes (or edge", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 476, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 195, + 490 + ], + "score": 1.0, + "content": "directions) is denoted", + "type": "text" + }, + { + "bbox": [ + 196, + 477, + 224, + 488 + ], + "score": 0.89, + "content": "{ \\mathfrak { G } } \\subset { \\mathcal { G } }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 476, + 267, + 490 + ], + "score": 1.0, + "content": ". We write", + "type": "text" + }, + { + "bbox": [ + 267, + 478, + 299, + 487 + ], + "score": 0.9, + "content": "G \\simeq H", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 476, + 352, + 490 + ], + "score": 1.0, + "content": "if the graphs", + "type": "text" + }, + { + "bbox": [ + 353, + 478, + 362, + 487 + ], + "score": 0.83, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 476, + 380, + 490 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 380, + 478, + 390, + 487 + ], + "score": 0.82, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 390, + 476, + 506, + 490 + ], + "score": 1.0, + "content": "are isomorphic. Further, we", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 487, + 506, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 484, + 501 + ], + "score": 1.0, + "content": "denote the isomorphism type, i.e., the equivalence class of the isomorphism relation, of a graph", + "type": "text" + }, + { + "bbox": [ + 484, + 488, + 493, + 498 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 487, + 506, + 501 + ], + "score": 1.0, + "content": "a s", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 497, + 503, + 512 + ], + "spans": [ + { + "bbox": [ + 107, + 500, + 129, + 511 + ], + "score": 0.91, + "content": "{ \\mathcal { T } } ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 129, + 497, + 150, + 512 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 151, + 499, + 196, + 511 + ], + "score": 0.91, + "content": "S \\subseteq V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 497, + 220, + 512 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 220, + 499, + 241, + 511 + ], + "score": 0.92, + "content": "G [ S ]", + "type": "inline_equation" + }, + { + "bbox": [ + 241, + 497, + 396, + 512 + ], + "score": 1.0, + "content": "is the induced subgraph with edge set", + "type": "text" + }, + { + "bbox": [ + 396, + 498, + 503, + 511 + ], + "score": 0.91, + "content": "E ( G ) [ S ] = \\{ S ^ { \\tilde { 2 } } \\cap ^ { } E ( G ) \\}", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 509, + 384, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 384, + 523 + ], + "score": 1.0, + "content": "We will refer to induced subgraphs simply as subgraphs in this work.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30 + }, + { + "type": "text", + "bbox": [ + 106, + 525, + 505, + 614 + ], + "lines": [ + { + "bbox": [ + 105, + 524, + 507, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 524, + 123, + 539 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 527, + 133, + 536 + ], + "score": 0.75, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 524, + 344, + 539 + ], + "score": 1.0, + "content": "be a family of graph representations, such that for", + "type": "text" + }, + { + "bbox": [ + 344, + 526, + 372, + 537 + ], + "score": 0.84, + "content": "d \\ge 1", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 524, + 376, + 539 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 376, + 528, + 383, + 536 + ], + "score": 0.62, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 524, + 396, + 539 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 396, + 526, + 406, + 536 + ], + "score": 0.55, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 524, + 410, + 539 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 410, + 525, + 461, + 537 + ], + "score": 0.89, + "content": "r \\colon \\mathcal { G } \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 524, + 507, + 539 + ], + "score": 1.0, + "content": ", assigns a", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 107, + 536, + 506, + 550 + ], + "spans": [ + { + "bbox": [ + 107, + 539, + 113, + 547 + ], + "score": 0.84, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 113, + 536, + 250, + 550 + ], + "score": 1.0, + "content": "-dimensional representation vector", + "type": "text" + }, + { + "bbox": [ + 250, + 538, + 272, + 549 + ], + "score": 0.91, + "content": "r ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 536, + 318, + 550 + ], + "score": 1.0, + "content": "for a graph", + "type": "text" + }, + { + "bbox": [ + 319, + 537, + 328, + 547 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 328, + 536, + 339, + 550 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 339, + 537, + 347, + 547 + ], + "score": 0.79, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 536, + 382, + 550 + ], + "score": 1.0, + "content": ". We say", + "type": "text" + }, + { + "bbox": [ + 382, + 537, + 392, + 547 + ], + "score": 0.77, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 536, + 486, + 550 + ], + "score": 1.0, + "content": "can distinguish a graph", + "type": "text" + }, + { + "bbox": [ + 486, + 537, + 495, + 547 + ], + "score": 0.84, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 496, + 536, + 506, + 550 + ], + "score": 1.0, + "content": "if", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 547, + 505, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 151, + 561 + ], + "score": 1.0, + "content": "there exists", + "type": "text" + }, + { + "bbox": [ + 152, + 550, + 158, + 558 + ], + "score": 0.75, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 547, + 168, + 561 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 168, + 549, + 178, + 558 + ], + "score": 0.8, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 547, + 420, + 561 + ], + "score": 1.0, + "content": "that assigns a unique representation to the isomorphism type of", + "type": "text" + }, + { + "bbox": [ + 420, + 549, + 429, + 558 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 429, + 547, + 448, + 561 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + }, + { + "bbox": [ + 449, + 548, + 505, + 560 + ], + "score": 0.93, + "content": "r ( G ) = r ( H )", + "type": "inline_equation" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 558, + 505, + 571 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 157, + 571 + ], + "score": 1.0, + "content": "if and only if", + "type": "text" + }, + { + "bbox": [ + 158, + 559, + 189, + 569 + ], + "score": 0.88, + "content": "G \\simeq H", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 558, + 253, + 571 + ], + "score": 1.0, + "content": ". 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Intuitively, the reconstruction conjecture states that an undirected edge-", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 630, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 106, + 630, + 506, + 642 + ], + "score": 1.0, + "content": "unattributed graph can be fully recovered up to its isomorphism type given the multiset of its vertex-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 640, + 506, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 506, + 654 + ], + "score": 1.0, + "content": "deleted subgraphs’ isomorphism types. This multiset of subgraphs is usually referred to as the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 651, + 505, + 664 + ], + "spans": [ + { + "bbox": [ + 105, + 651, + 403, + 664 + ], + "score": 1.0, + "content": "deck of the graph, see Figure 1 for an illustration. Formally, for a graph", + "type": "text" + }, + { + "bbox": [ + 404, + 652, + 413, + 662 + ], + "score": 0.8, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 413, + 651, + 505, + 664 + ], + "score": 1.0, + "content": ", we define its deck as", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 662, + 505, + 675 + ], + "spans": [ + { + "bbox": [ + 106, + 662, + 295, + 675 + ], + "score": 0.92, + "content": "{ \\mathcal { D } } _ { n - 1 } ( G ) = \\left\\{ \\left\\{ { G } [ V ( G ) - v ] ) \\colon v \\in V ( G ) \\right\\} \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 662, + 415, + 675 + ], + "score": 1.0, + "content": ". We often call an element in", + "type": "text" + }, + { + "bbox": [ + 415, + 662, + 455, + 675 + ], + "score": 0.93, + "content": "{ \\mathcal { D } } _ { n - 1 } ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 662, + 505, + 675 + ], + "score": 1.0, + "content": "a card. 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Moreover, Yehudai et al. [107] investigate GNNs’ ability", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 104, + 177, + 506, + 191 + ], + "spans": [ + { + "bbox": [ + 104, + 177, + 506, + 191 + ], + "score": 1.0, + "content": "to generalize to larger graphs. Concurrently, Bevilacqua et al. [12] show how subgraph densities can", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 189, + 505, + 201 + ], + "spans": [ + { + "bbox": [ + 105, + 189, + 505, + 201 + ], + "score": 1.0, + "content": "be used to build size-invariant graph representations. However, the performance of such models in", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 106, + 200, + 505, + 211 + ], + "spans": [ + { + "bbox": [ + 106, + 200, + 505, + 211 + ], + "score": 1.0, + "content": "in-distribution tasks, their expressiveness, and scalability remain unclear. Finally, Yuan et al. [111]", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 210, + 506, + 223 + ], + "spans": [ + { + "bbox": [ + 105, + 210, + 506, + 223 + ], + "score": 1.0, + "content": "show how GNNs’ decisions can be explained by (often large) subgraphs, further motivating our use of", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 222, + 344, + 233 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 344, + 233 + ], + "score": 1.0, + "content": "graph reconstruction as a powerful inductive bias for GRL.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 7, + "bbox_fs": [ + 104, + 155, + 506, + 233 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 237, + 505, + 315 + ], + "lines": [ + { + "bbox": [ + 106, + 238, + 505, + 250 + ], + "spans": [ + { + "bbox": [ + 106, + 238, + 505, + 250 + ], + "score": 1.0, + "content": "Reconstruction conjecture. The reconstruction conjecture is a longstanding open problem in graph", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 248, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 105, + 248, + 506, + 261 + ], + "score": 1.0, + "content": "theory, which has been solved in many particular settings. Such results come in two flavors. Either", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 259, + 506, + 273 + ], + "spans": [ + { + "bbox": [ + 105, + 259, + 506, + 273 + ], + "score": 1.0, + "content": "proving that graphs from a specific class are reconstructible or determining which graph functions are", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 271, + 506, + 283 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 506, + 283 + ], + "score": 1.0, + "content": "reconstructible. Known results of the former are, for instance, that regular graphs, disconnected graphs,", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 106, + 281, + 505, + 294 + ], + "spans": [ + { + "bbox": [ + 106, + 281, + 505, + 294 + ], + "score": 1.0, + "content": "and trees are reconstructible [16, 53]. In particular, we highlight that outerplanar graphs, which account", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 291, + 505, + 306 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 505, + 306 + ], + "score": 1.0, + "content": "for most molecule graphs, are known to be reconstructible [41]. For a comprehensive review of graph", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 105, + 304, + 263, + 316 + ], + "spans": [ + { + "bbox": [ + 105, + 304, + 263, + 316 + ], + "score": 1.0, + "content": "reconstruction results, see Bondy [16].", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 14, + "bbox_fs": [ + 105, + 238, + 506, + 316 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 331, + 195, + 344 + ], + "lines": [ + { + "bbox": [ + 104, + 329, + 196, + 347 + ], + "spans": [ + { + "bbox": [ + 104, + 329, + 196, + 347 + ], + "score": 1.0, + "content": "2 Preliminaries", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 107, + 357, + 505, + 379 + ], + "lines": [ + { + "bbox": [ + 106, + 357, + 505, + 369 + ], + "spans": [ + { + "bbox": [ + 106, + 357, + 505, + 369 + ], + "score": 1.0, + "content": "Here, we introduce notation and give an overview of the main results in graph reconstruction theory [16,", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 367, + 503, + 380 + ], + "spans": [ + { + "bbox": [ + 105, + 367, + 503, + 380 + ], + "score": 1.0, + "content": "43], including the reconstruction conjecture [96], which forms the basis of the models in this work.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 19.5, + "bbox_fs": [ + 105, + 357, + 505, + 380 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 383, + 506, + 461 + ], + "lines": [ + { + "bbox": [ + 105, + 383, + 506, + 397 + ], + "spans": [ + { + "bbox": [ + 105, + 383, + 270, + 397 + ], + "score": 1.0, + "content": "Notation and definitions. As usual, let", + "type": "text" + }, + { + "bbox": [ + 270, + 384, + 362, + 396 + ], + "score": 0.91, + "content": "[ n ] = \\left\\{ 1 , \\dots , n \\right\\} \\subset \\mathbb { N }", + "type": "inline_equation" + }, + { + "bbox": [ + 363, + 383, + 378, + 397 + ], + "score": 1.0, + "content": "for", + "type": "text" + }, + { + "bbox": [ + 378, + 385, + 405, + 395 + ], + "score": 0.9, + "content": "n \\geq 1", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 383, + 439, + 397 + ], + "score": 1.0, + "content": ", and let", + "type": "text" + }, + { + "bbox": [ + 439, + 384, + 467, + 396 + ], + "score": 0.91, + "content": "\\mathbb { f } \\dots \\mathbb { Y }", + "type": "inline_equation" + }, + { + "bbox": [ + 467, + 383, + 506, + 397 + ], + "score": 1.0, + "content": "denote a", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 394, + 506, + 408 + ], + "spans": [ + { + "bbox": [ + 105, + 394, + 273, + 408 + ], + "score": 1.0, + "content": "multiset. In an abuse of notation, for a set", + "type": "text" + }, + { + "bbox": [ + 273, + 396, + 284, + 405 + ], + "score": 0.82, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 394, + 304, + 408 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 305, + 397, + 312, + 405 + ], + "score": 0.8, + "content": "x", + "type": "inline_equation" + }, + { + "bbox": [ + 312, + 394, + 323, + 408 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 324, + 396, + 333, + 405 + ], + "score": 0.82, + "content": "X", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 394, + 392, + 408 + ], + "score": 1.0, + "content": ", we denote by", + "type": "text" + }, + { + "bbox": [ + 393, + 396, + 421, + 406 + ], + "score": 0.9, + "content": "X - x", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 394, + 450, + 408 + ], + "score": 1.0, + "content": "the set", + "type": "text" + }, + { + "bbox": [ + 450, + 395, + 485, + 407 + ], + "score": 0.92, + "content": "X { \\bar { \\backslash } } \\left\\{ x \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 394, + 506, + 408 + ], + "score": 1.0, + "content": ". We", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 106, + 406, + 506, + 419 + ], + "score": 1.0, + "content": "also assume elementary definitions from graph theory, such as graphs, directed graphs, vertices, edges,", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 417, + 504, + 429 + ], + "spans": [ + { + "bbox": [ + 106, + 417, + 495, + 429 + ], + "score": 1.0, + "content": "neighbors, trees, isomorphism, et cetera; see Appendix B. The vertex and the edge set of a graph", + "type": "text" + }, + { + "bbox": [ + 495, + 417, + 504, + 427 + ], + "score": 0.78, + "content": "G", + "type": "inline_equation" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 427, + 507, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 427, + 166, + 441 + ], + "score": 1.0, + "content": "are denoted by", + "type": "text" + }, + { + "bbox": [ + 166, + 428, + 191, + 440 + ], + "score": 0.92, + "content": "V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 191, + 427, + 209, + 441 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 209, + 428, + 233, + 440 + ], + "score": 0.92, + "content": "E ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 234, + 427, + 365, + 441 + ], + "score": 1.0, + "content": ", respectively. The size of a graph", + "type": "text" + }, + { + "bbox": [ + 365, + 428, + 374, + 438 + ], + "score": 0.81, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 374, + 427, + 507, + 441 + ], + "score": 1.0, + "content": "is equal to its number of vertices.", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 438, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 438, + 245, + 452 + ], + "score": 1.0, + "content": "Unless indicated otherwise, we use", + "type": "text" + }, + { + "bbox": [ + 246, + 439, + 298, + 451 + ], + "score": 0.93, + "content": "n : = | V ( G ) |", + "type": "inline_equation" + }, + { + "bbox": [ + 298, + 438, + 506, + 452 + ], + "score": 1.0, + "content": ". If not otherwise stated, we assume that vertices and", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 106, + 450, + 341, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 450, + 341, + 462 + ], + "score": 1.0, + "content": "edges are annoted with attributes, i.e., real-valued vectors.", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 24, + "bbox_fs": [ + 105, + 383, + 507, + 462 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 465, + 505, + 522 + ], + "lines": [ + { + "bbox": [ + 105, + 465, + 505, + 479 + ], + "spans": [ + { + "bbox": [ + 105, + 465, + 305, + 479 + ], + "score": 1.0, + "content": "We denote the set of all finite and simple graphs by", + "type": "text" + }, + { + "bbox": [ + 306, + 466, + 313, + 477 + ], + "score": 0.79, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 313, + 465, + 371, + 479 + ], + "score": 1.0, + "content": ". The subset of", + "type": "text" + }, + { + "bbox": [ + 372, + 466, + 379, + 477 + ], + "score": 0.85, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 465, + 505, + 479 + ], + "score": 1.0, + "content": "without edge attributes (or edge", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 476, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 195, + 490 + ], + "score": 1.0, + "content": "directions) is denoted", + "type": "text" + }, + { + "bbox": [ + 196, + 477, + 224, + 488 + ], + "score": 0.89, + "content": "{ \\mathfrak { G } } \\subset { \\mathcal { G } }", + "type": "inline_equation" + }, + { + "bbox": [ + 224, + 476, + 267, + 490 + ], + "score": 1.0, + "content": ". We write", + "type": "text" + }, + { + "bbox": [ + 267, + 478, + 299, + 487 + ], + "score": 0.9, + "content": "G \\simeq H", + "type": "inline_equation" + }, + { + "bbox": [ + 299, + 476, + 352, + 490 + ], + "score": 1.0, + "content": "if the graphs", + "type": "text" + }, + { + "bbox": [ + 353, + 478, + 362, + 487 + ], + "score": 0.83, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 362, + 476, + 380, + 490 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 380, + 478, + 390, + 487 + ], + "score": 0.82, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 390, + 476, + 506, + 490 + ], + "score": 1.0, + "content": "are isomorphic. Further, we", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 487, + 506, + 501 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 484, + 501 + ], + "score": 1.0, + "content": "denote the isomorphism type, i.e., the equivalence class of the isomorphism relation, of a graph", + "type": "text" + }, + { + "bbox": [ + 484, + 488, + 493, + 498 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 493, + 487, + 506, + 501 + ], + "score": 1.0, + "content": "a s", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 497, + 503, + 512 + ], + "spans": [ + { + "bbox": [ + 107, + 500, + 129, + 511 + ], + "score": 0.91, + "content": "{ \\mathcal { T } } ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 129, + 497, + 150, + 512 + ], + "score": 1.0, + "content": ". Let", + "type": "text" + }, + { + "bbox": [ + 151, + 499, + 196, + 511 + ], + "score": 0.91, + "content": "S \\subseteq V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 497, + 220, + 512 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 220, + 499, + 241, + 511 + ], + "score": 0.92, + "content": "G [ S ]", + "type": "inline_equation" + }, + { + "bbox": [ + 241, + 497, + 396, + 512 + ], + "score": 1.0, + "content": "is the induced subgraph with edge set", + "type": "text" + }, + { + "bbox": [ + 396, + 498, + 503, + 511 + ], + "score": 0.91, + "content": "E ( G ) [ S ] = \\{ S ^ { \\tilde { 2 } } \\cap ^ { } E ( G ) \\}", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 509, + 384, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 384, + 523 + ], + "score": 1.0, + "content": "We will refer to induced subgraphs simply as subgraphs in this work.", + "type": "text" + } + ], + "index": 32 + } + ], + "index": 30, + "bbox_fs": [ + 105, + 465, + 506, + 523 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 525, + 505, + 614 + ], + "lines": [ + { + "bbox": [ + 105, + 524, + 507, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 524, + 123, + 539 + ], + "score": 1.0, + "content": "Let", + "type": "text" + }, + { + "bbox": [ + 123, + 527, + 133, + 536 + ], + "score": 0.75, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 133, + 524, + 344, + 539 + ], + "score": 1.0, + "content": "be a family of graph representations, such that for", + "type": "text" + }, + { + "bbox": [ + 344, + 526, + 372, + 537 + ], + "score": 0.84, + "content": "d \\ge 1", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 524, + 376, + 539 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 376, + 528, + 383, + 536 + ], + "score": 0.62, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 383, + 524, + 396, + 539 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 396, + 526, + 406, + 536 + ], + "score": 0.55, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 524, + 410, + 539 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 410, + 525, + 461, + 537 + ], + "score": 0.89, + "content": "r \\colon \\mathcal { G } \\mathbb { R } ^ { d }", + "type": "inline_equation" + }, + { + "bbox": [ + 461, + 524, + 507, + 539 + ], + "score": 1.0, + "content": ", assigns a", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 107, + 536, + 506, + 550 + ], + "spans": [ + { + "bbox": [ + 107, + 539, + 113, + 547 + ], + "score": 0.84, + "content": "d", + "type": "inline_equation" + }, + { + "bbox": [ + 113, + 536, + 250, + 550 + ], + "score": 1.0, + "content": "-dimensional representation vector", + "type": "text" + }, + { + "bbox": [ + 250, + 538, + 272, + 549 + ], + "score": 0.91, + "content": "r ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 272, + 536, + 318, + 550 + ], + "score": 1.0, + "content": "for a graph", + "type": "text" + }, + { + "bbox": [ + 319, + 537, + 328, + 547 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 328, + 536, + 339, + 550 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 339, + 537, + 347, + 547 + ], + "score": 0.79, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 347, + 536, + 382, + 550 + ], + "score": 1.0, + "content": ". We say", + "type": "text" + }, + { + "bbox": [ + 382, + 537, + 392, + 547 + ], + "score": 0.77, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 392, + 536, + 486, + 550 + ], + "score": 1.0, + "content": "can distinguish a graph", + "type": "text" + }, + { + "bbox": [ + 486, + 537, + 495, + 547 + ], + "score": 0.84, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 496, + 536, + 506, + 550 + ], + "score": 1.0, + "content": "if", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 547, + 505, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 151, + 561 + ], + "score": 1.0, + "content": "there exists", + "type": "text" + }, + { + "bbox": [ + 152, + 550, + 158, + 558 + ], + "score": 0.75, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 158, + 547, + 168, + 561 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 168, + 549, + 178, + 558 + ], + "score": 0.8, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 547, + 420, + 561 + ], + "score": 1.0, + "content": "that assigns a unique representation to the isomorphism type of", + "type": "text" + }, + { + "bbox": [ + 420, + 549, + 429, + 558 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 429, + 547, + 448, + 561 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + }, + { + "bbox": [ + 449, + 548, + 505, + 560 + ], + "score": 0.93, + "content": "r ( G ) = r ( H )", + "type": "inline_equation" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 558, + 505, + 571 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 157, + 571 + ], + "score": 1.0, + "content": "if and only if", + "type": "text" + }, + { + "bbox": [ + 158, + 559, + 189, + 569 + ], + "score": 0.88, + "content": "G \\simeq H", + "type": "inline_equation" + }, + { + "bbox": [ + 189, + 558, + 253, + 571 + ], + "score": 1.0, + "content": ". Further, we say", + "type": "text" + }, + { + "bbox": [ + 254, + 561, + 263, + 569 + ], + "score": 0.85, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 263, + 558, + 438, + 571 + ], + "score": 1.0, + "content": "distinguishes a pair of non-isomorphic graphs", + "type": "text" + }, + { + "bbox": [ + 438, + 559, + 448, + 569 + ], + "score": 0.83, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 448, + 558, + 464, + 571 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 464, + 560, + 475, + 569 + ], + "score": 0.82, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 475, + 558, + 505, + 571 + ], + "score": 1.0, + "content": "if there", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 568, + 506, + 583 + ], + "spans": [ + { + "bbox": [ + 105, + 568, + 153, + 583 + ], + "score": 1.0, + "content": "exists some", + "type": "text" + }, + { + "bbox": [ + 153, + 572, + 159, + 579 + ], + "score": 0.78, + "content": "r", + "type": "inline_equation" + }, + { + "bbox": [ + 159, + 568, + 169, + 583 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 170, + 570, + 180, + 579 + ], + "score": 0.8, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 180, + 568, + 217, + 583 + ], + "score": 1.0, + "content": "such that", + "type": "text" + }, + { + "bbox": [ + 217, + 571, + 273, + 581 + ], + "score": 0.92, + "content": "r ( G ) \\neq r ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 568, + 354, + 583 + ], + "score": 1.0, + "content": ". Moreover, we write", + "type": "text" + }, + { + "bbox": [ + 354, + 570, + 394, + 581 + ], + "score": 0.92, + "content": "\\Re _ { 1 } \\preceq \\Re _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 394, + 568, + 403, + 583 + ], + "score": 1.0, + "content": "if", + "type": "text" + }, + { + "bbox": [ + 404, + 570, + 418, + 581 + ], + "score": 0.9, + "content": "\\Re _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 418, + 568, + 506, + 583 + ], + "score": 1.0, + "content": "distinguishes between", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 105, + 580, + 506, + 594 + ], + "spans": [ + { + "bbox": [ + 105, + 580, + 146, + 594 + ], + "score": 1.0, + "content": "all graphs", + "type": "text" + }, + { + "bbox": [ + 147, + 581, + 161, + 592 + ], + "score": 0.89, + "content": "\\Re _ { 1 }", + "type": "inline_equation" + }, + { + "bbox": [ + 161, + 580, + 201, + 594 + ], + "score": 1.0, + "content": "does, and", + "type": "text" + }, + { + "bbox": [ + 201, + 581, + 241, + 592 + ], + "score": 0.92, + "content": "\\Re _ { 1 } \\equiv \\Re _ { 2 }", + "type": "inline_equation" + }, + { + "bbox": [ + 241, + 580, + 506, + 594 + ], + "score": 1.0, + "content": "if both directions hold. The corresponding strict relation is denoted", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 592, + 505, + 604 + ], + "spans": [ + { + "bbox": [ + 106, + 592, + 119, + 604 + ], + "score": 1.0, + "content": "by", + "type": "text" + }, + { + "bbox": [ + 119, + 593, + 128, + 602 + ], + "score": 0.74, + "content": "\\prec", + "type": "inline_equation" + }, + { + "bbox": [ + 128, + 592, + 194, + 604 + ], + "score": 1.0, + "content": ". Finally, we say", + "type": "text" + }, + { + "bbox": [ + 194, + 592, + 203, + 601 + ], + "score": 0.82, + "content": "\\Re", + "type": "inline_equation" + }, + { + "bbox": [ + 204, + 592, + 505, + 604 + ], + "score": 1.0, + "content": "is a most-expressive representation of a class of graphs if it distinguishes all", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 603, + 253, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 603, + 253, + 615 + ], + "score": 1.0, + "content": "non-isomorphic graphs in that class.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 36.5, + "bbox_fs": [ + 105, + 524, + 507, + 615 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 618, + 505, + 685 + ], + "lines": [ + { + "bbox": [ + 106, + 618, + 506, + 632 + ], + "spans": [ + { + "bbox": [ + 106, + 618, + 506, + 632 + ], + "score": 1.0, + "content": "Graph reconstruction. Intuitively, the reconstruction conjecture states that an undirected edge-", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 630, + 506, + 642 + ], + "spans": [ + { + "bbox": [ + 106, + 630, + 506, + 642 + ], + "score": 1.0, + "content": "unattributed graph can be fully recovered up to its isomorphism type given the multiset of its vertex-", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 640, + 506, + 654 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 506, + 654 + ], + "score": 1.0, + "content": "deleted subgraphs’ isomorphism types. This multiset of subgraphs is usually referred to as the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 651, + 505, + 664 + ], + "spans": [ + { + "bbox": [ + 105, + 651, + 403, + 664 + ], + "score": 1.0, + "content": "deck of the graph, see Figure 1 for an illustration. Formally, for a graph", + "type": "text" + }, + { + "bbox": [ + 404, + 652, + 413, + 662 + ], + "score": 0.8, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 413, + 651, + 505, + 664 + ], + "score": 1.0, + "content": ", we define its deck as", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 106, + 662, + 505, + 675 + ], + "spans": [ + { + "bbox": [ + 106, + 662, + 295, + 675 + ], + "score": 0.92, + "content": "{ \\mathcal { D } } _ { n - 1 } ( G ) = \\left\\{ \\left\\{ { G } [ V ( G ) - v ] ) \\colon v \\in V ( G ) \\right\\} \\right\\}", + "type": "inline_equation" + }, + { + "bbox": [ + 295, + 662, + 415, + 675 + ], + "score": 1.0, + "content": ". We often call an element in", + "type": "text" + }, + { + "bbox": [ + 415, + 662, + 455, + 675 + ], + "score": 0.93, + "content": "{ \\mathcal { D } } _ { n - 1 } ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 456, + 662, + 505, + 675 + ], + "score": 1.0, + "content": "a card. We", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 672, + 315, + 686 + ], + "spans": [ + { + "bbox": [ + 105, + 672, + 315, + 686 + ], + "score": 1.0, + "content": "define the graph reconstruction problem as follows.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 43.5, + "bbox_fs": [ + 105, + 618, + 506, + 686 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 688, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 105, + 687, + 507, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 178, + 701 + ], + "score": 1.0, + "content": "Definition 1. Let", + "type": "text" + }, + { + "bbox": [ + 178, + 689, + 187, + 699 + ], + "score": 0.75, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 188, + 687, + 205, + 701 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 205, + 689, + 216, + 699 + ], + "score": 0.73, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 216, + 687, + 278, + 701 + ], + "score": 1.0, + "content": "be graphs, then", + "type": "text" + }, + { + "bbox": [ + 278, + 689, + 288, + 699 + ], + "score": 0.74, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 289, + 687, + 372, + 701 + ], + "score": 1.0, + "content": "is a reconstruction of", + "type": "text" + }, + { + "bbox": [ + 372, + 690, + 381, + 699 + ], + "score": 0.75, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 687, + 390, + 701 + ], + "score": 1.0, + "content": "if", + "type": "text" + }, + { + "bbox": [ + 390, + 689, + 400, + 699 + ], + "score": 0.62, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 401, + 687, + 418, + 701 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 419, + 689, + 427, + 699 + ], + "score": 0.74, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 687, + 507, + 701 + ], + "score": 1.0, + "content": "have the same deck,", + "type": "text" + } + ], + "index": 47 + }, + { + "bbox": [ + 105, + 699, + 506, + 713 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 141, + 713 + ], + "score": 1.0, + "content": "denoted", + "type": "text" + }, + { + "bbox": [ + 141, + 700, + 173, + 710 + ], + "score": 0.86, + "content": "H \\sim G", + "type": "inline_equation" + }, + { + "bbox": [ + 173, + 699, + 177, + 713 + ], + "score": 1.0, + "content": ".", + "type": "text" + }, + { + "bbox": [ + 177, + 701, + 186, + 710 + ], + "score": 0.29, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 186, + 699, + 213, + 713 + ], + "score": 1.0, + "content": "graph", + "type": "text" + }, + { + "bbox": [ + 213, + 700, + 223, + 710 + ], + "score": 0.81, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 699, + 398, + 713 + ], + "score": 1.0, + "content": "is reconstructible if every reconstruction of", + "type": "text" + }, + { + "bbox": [ + 399, + 700, + 408, + 710 + ], + "score": 0.74, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 408, + 699, + 477, + 713 + ], + "score": 1.0, + "content": "is isomorphic to", + "type": "text" + }, + { + "bbox": [ + 477, + 700, + 486, + 710 + ], + "score": 0.69, + "content": "G _ { : }", + "type": "inline_equation" + }, + { + "bbox": [ + 486, + 699, + 506, + 713 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 107, + 711, + 206, + 723 + ], + "spans": [ + { + "bbox": [ + 107, + 711, + 138, + 721 + ], + "score": 0.89, + "content": "H \\sim G", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 711, + 171, + 723 + ], + "score": 1.0, + "content": "implies", + "type": "text" + }, + { + "bbox": [ + 171, + 711, + 201, + 721 + ], + "score": 0.9, + "content": "H \\simeq G", + "type": "inline_equation" + }, + { + "bbox": [ + 202, + 711, + 206, + 723 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 49 + } + ], + "index": 48, + "bbox_fs": [ + 105, + 687, + 507, + 723 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 73, + 504, + 95 + ], + "lines": [ + { + "bbox": [ + 105, + 70, + 505, + 87 + ], + "spans": [ + { + "bbox": [ + 105, + 70, + 505, + 87 + ], + "score": 1.0, + "content": "Similarly, we define function reconstruction, which relates functions that map two graphs to the same", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 83, + 241, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 83, + 241, + 96 + ], + "score": 1.0, + "content": "value if they have the same deck.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 108, + 97, + 504, + 120 + ], + "lines": [ + { + "bbox": [ + 105, + 96, + 506, + 111 + ], + "spans": [ + { + "bbox": [ + 105, + 96, + 178, + 111 + ], + "score": 1.0, + "content": "Definition 2. Let", + "type": "text" + }, + { + "bbox": [ + 178, + 97, + 222, + 109 + ], + "score": 0.89, + "content": "f \\colon { \\mathcal { G } } { \\mathcal { V } }", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 96, + 297, + 111 + ], + "score": 1.0, + "content": "be a function, then", + "type": "text" + }, + { + "bbox": [ + 297, + 98, + 304, + 109 + ], + "score": 0.83, + "content": "f", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 96, + 380, + 111 + ], + "score": 1.0, + "content": "is reconstructible if", + "type": "text" + }, + { + "bbox": [ + 381, + 97, + 439, + 110 + ], + "score": 0.92, + "content": "f ( G ) = f ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 96, + 506, + 111 + ], + "score": 1.0, + "content": "for all graphs in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 107, + 108, + 354, + 122 + ], + "spans": [ + { + "bbox": [ + 107, + 108, + 206, + 121 + ], + "score": 0.91, + "content": "\\{ ( H , G ) \\in \\mathcal { G } ^ { 2 } : H \\sim G \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 108, + 227, + 122 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + }, + { + "bbox": [ + 228, + 109, + 259, + 119 + ], + "score": 0.89, + "content": "G \\sim H", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 108, + 291, + 122 + ], + "score": 1.0, + "content": "implies", + "type": "text" + }, + { + "bbox": [ + 292, + 108, + 350, + 121 + ], + "score": 0.93, + "content": "{ \\dot { f } } ( G ) = f ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 350, + 108, + 354, + 122 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5 + }, + { + "type": "text", + "bbox": [ + 106, + 123, + 504, + 145 + ], + "lines": [ + { + "bbox": [ + 106, + 123, + 505, + 136 + ], + "spans": [ + { + "bbox": [ + 106, + 123, + 411, + 136 + ], + "score": 1.0, + "content": "We can now state the reconstruction conjecture, which in short says that every", + "type": "text" + }, + { + "bbox": [ + 412, + 124, + 421, + 133 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 123, + 432, + 136 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 432, + 124, + 441, + 133 + ], + "score": 0.67, + "content": "\\mathfrak { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 123, + 462, + 136 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 462, + 123, + 495, + 135 + ], + "score": 0.92, + "content": "| V | \\geq 3", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 123, + 505, + 136 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 134, + 171, + 145 + ], + "spans": [ + { + "bbox": [ + 105, + 134, + 171, + 145 + ], + "score": 1.0, + "content": "reconstructible.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5 + }, + { + "type": "text", + "bbox": [ + 107, + 147, + 504, + 171 + ], + "lines": [ + { + "bbox": [ + 106, + 147, + 504, + 160 + ], + "spans": [ + { + "bbox": [ + 106, + 147, + 276, + 160 + ], + "score": 1.0, + "content": "Conjecture 1 (Kelly [52], Ulam [96]). Let", + "type": "text" + }, + { + "bbox": [ + 277, + 149, + 287, + 158 + ], + "score": 0.75, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 147, + 304, + 160 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 305, + 149, + 314, + 158 + ], + "score": 0.79, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 147, + 324, + 160 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 325, + 149, + 333, + 158 + ], + "score": 0.64, + "content": "\\mathfrak { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 147, + 504, + 160 + ], + "score": 1.0, + "content": "be two finite, undirected, simple graphs with", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 158, + 441, + 173 + ], + "spans": [ + { + "bbox": [ + 105, + 158, + 206, + 173 + ], + "score": 1.0, + "content": "at least three vertices. If", + "type": "text" + }, + { + "bbox": [ + 206, + 160, + 216, + 169 + ], + "score": 0.56, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 158, + 304, + 173 + ], + "score": 1.0, + "content": "is a reconstruction of", + "type": "text" + }, + { + "bbox": [ + 305, + 160, + 313, + 169 + ], + "score": 0.69, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 158, + 337, + 173 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 337, + 160, + 347, + 169 + ], + "score": 0.71, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 158, + 366, + 173 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 366, + 160, + 375, + 169 + ], + "score": 0.62, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 375, + 158, + 441, + 173 + ], + "score": 1.0, + "content": "are isomorphic.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6.5 + }, + { + "type": "text", + "bbox": [ + 106, + 173, + 505, + 251 + ], + "lines": [ + { + "bbox": [ + 106, + 173, + 505, + 186 + ], + "spans": [ + { + "bbox": [ + 106, + 173, + 505, + 186 + ], + "score": 1.0, + "content": "We note here that the reconstruction conjecture does not hold for directed graphs, hypergraphs, and", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 183, + 507, + 198 + ], + "spans": [ + { + "bbox": [ + 104, + 183, + 507, + 198 + ], + "score": 1.0, + "content": "infinite graphs [16, 92, 93]. In particular, edge directions can be seen as edge attributes. Thus,", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 195, + 505, + 208 + ], + "spans": [ + { + "bbox": [ + 105, + 195, + 340, + 208 + ], + "score": 1.0, + "content": "the reconstruction conjecture does not hold for the class", + "type": "text" + }, + { + "bbox": [ + 341, + 196, + 349, + 207 + ], + "score": 0.79, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 195, + 505, + 208 + ], + "score": 1.0, + "content": ". In contrast, the conjecture has been", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 104, + 207, + 506, + 219 + ], + "spans": [ + { + "bbox": [ + 104, + 207, + 506, + 219 + ], + "score": 1.0, + "content": "proved for practical-relevant graph classes, such as disconnected graphs, regular graphs, trees, and", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 217, + 506, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 506, + 230 + ], + "score": 1.0, + "content": "outerplanar graphs [16]. Further, computational searches show that graphs with up to eleven vertices are", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 228, + 505, + 241 + ], + "spans": [ + { + "bbox": [ + 105, + 228, + 505, + 241 + ], + "score": 1.0, + "content": "reconstructible [68]. 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In practice,", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 446, + 504, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 446, + 265, + 459 + ], + "score": 1.0, + "content": "these results imply that for some fixed", + "type": "text" + }, + { + "bbox": [ + 265, + 447, + 272, + 456 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 446, + 497, + 459 + ], + "score": 1.0, + "content": "there will be graphs with not many more vertices than", + "type": "text" + }, + { + "bbox": [ + 497, + 446, + 504, + 456 + ], + "score": 0.77, + "content": "k", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 456, + 506, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 153, + 470 + ], + "score": 1.0, + "content": "that are not", + "type": "text" + }, + { + "bbox": [ + 153, + 457, + 160, + 467 + ], + "score": 0.83, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 456, + 258, + 470 + ], + "score": 1.0, + "content": "-reconstructible. 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In Appendix C, we discuss", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 480, + 187, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 480, + 187, + 490 + ], + "score": 1.0, + "content": "further such results.", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 30 + }, + { + "type": "title", + "bbox": [ + 107, + 505, + 294, + 519 + ], + "lines": [ + { + "bbox": [ + 104, + 504, + 295, + 520 + ], + "spans": [ + { + "bbox": [ + 104, + 504, + 295, + 520 + ], + "score": 1.0, + "content": "3 Reconstruction Neural Networks", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 106, + 529, + 505, + 585 + ], + "lines": [ + { + "bbox": [ + 105, + 528, + 505, + 542 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 438, + 542 + ], + "score": 1.0, + "content": "Building on the previous section, we propose two neural architectures based on graph", + "type": "text" + }, + { + "bbox": [ + 439, + 530, + 446, + 540 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 528, + 505, + 542 + ], + "score": 1.0, + "content": "-reconstruction", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 540, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 540, + 277, + 554 + ], + "score": 1.0, + "content": "and graph reconstruction. 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Secondly, we look at Full Reconstruction Neural Networks, where we", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 561, + 505, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 505, + 576 + ], + "score": 1.0, + "content": "leverage the Reconstruction Conjecture to build a most-expressive representation for the class of graphs", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 572, + 267, + 586 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 267, + 586 + ], + "score": 1.0, + "content": "of bounded size and unattributed edges.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 38 + }, + { + "type": "text", + "bbox": [ + 106, + 589, + 505, + 669 + ], + "lines": [ + { + "bbox": [ + 107, + 588, + 505, + 602 + ], + "spans": [ + { + "bbox": [ + 107, + 591, + 113, + 600 + ], + "score": 0.75, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 588, + 365, + 602 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks. Intuitively, the key idea of", + "type": "text" + }, + { + "bbox": [ + 366, + 590, + 372, + 600 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 372, + 588, + 505, + 602 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 600, + 506, + 613 + ], + "spans": [ + { + "bbox": [ + 105, + 600, + 403, + 613 + ], + "score": 1.0, + "content": "is that of learning a joint representation based on subgraphs induced by", + "type": "text" + }, + { + "bbox": [ + 403, + 601, + 410, + 610 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 410, + 600, + 506, + 613 + ], + "score": 1.0, + "content": "vertices. Formally, let", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 107, + 608, + 505, + 626 + ], + "spans": [ + { + "bbox": [ + 107, + 611, + 205, + 624 + ], + "score": 0.91, + "content": "f _ { \\mathbf { W } } \\colon \\cup _ { m = 1 } ^ { \\infty } \\mathbb { R } ^ { m \\times \\breve { d } } \\overline { { \\mathbb { R } } } ^ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 206, + 608, + 400, + 626 + ], + "score": 1.0, + "content": "be a (row-wise) permutation-invariant function and", + "type": "text" + }, + { + "bbox": [ + 401, + 611, + 505, + 624 + ], + "score": 0.9, + "content": "\\mathcal { G } _ { k } = \\{ G \\in \\mathcal { G } \\colon | V ( \\dot { G } ) | =", + "type": "inline_equation" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 621, + 506, + 637 + ], + "spans": [ + { + "bbox": [ + 106, + 624, + 118, + 636 + ], + "score": 0.87, + "content": "k \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 118, + 621, + 245, + 637 + ], + "score": 1.0, + "content": "be the set of graphs with exactly", + "type": "text" + }, + { + "bbox": [ + 245, + 624, + 252, + 634 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 621, + 331, + 637 + ], + "score": 1.0, + "content": "vertices. 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Note that", + "type": "text" + }, + { + "bbox": [ + 390, + 710, + 407, + 721 + ], + "score": 0.9, + "content": "h ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 709, + 505, + 724 + ], + "score": 1.0, + "content": "might also be a function", + "type": "text" + } + ], + "index": 50 + } + ], + "index": 49.5 + } + ], + "page_idx": 3, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 302, + 741, + 308, + 750 + ], + "lines": [ + { + "bbox": [ + 301, + 740, + 310, + 752 + ], + "spans": [ + { + "bbox": [ + 301, + 740, + 310, + 752 + ], + "score": 1.0, + "content": "", + "type": "text", + "height": 12, + "width": 9 + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 73, + 504, + 95 + ], + "lines": [ + { + "bbox": [ + 105, + 70, + 505, + 87 + ], + "spans": [ + { + "bbox": [ + 105, + 70, + 505, + 87 + ], + "score": 1.0, + "content": "Similarly, we define function reconstruction, which relates functions that map two graphs to the same", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 83, + 241, + 96 + ], + "spans": [ + { + "bbox": [ + 105, + 83, + 241, + 96 + ], + "score": 1.0, + "content": "value if they have the same deck.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 105, + 70, + 505, + 96 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 97, + 504, + 120 + ], + "lines": [ + { + "bbox": [ + 105, + 96, + 506, + 111 + ], + "spans": [ + { + "bbox": [ + 105, + 96, + 178, + 111 + ], + "score": 1.0, + "content": "Definition 2. Let", + "type": "text" + }, + { + "bbox": [ + 178, + 97, + 222, + 109 + ], + "score": 0.89, + "content": "f \\colon { \\mathcal { G } } { \\mathcal { V } }", + "type": "inline_equation" + }, + { + "bbox": [ + 223, + 96, + 297, + 111 + ], + "score": 1.0, + "content": "be a function, then", + "type": "text" + }, + { + "bbox": [ + 297, + 98, + 304, + 109 + ], + "score": 0.83, + "content": "f", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 96, + 380, + 111 + ], + "score": 1.0, + "content": "is reconstructible if", + "type": "text" + }, + { + "bbox": [ + 381, + 97, + 439, + 110 + ], + "score": 0.92, + "content": "f ( G ) = f ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 439, + 96, + 506, + 111 + ], + "score": 1.0, + "content": "for all graphs in", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 107, + 108, + 354, + 122 + ], + "spans": [ + { + "bbox": [ + 107, + 108, + 206, + 121 + ], + "score": 0.91, + "content": "\\{ ( H , G ) \\in \\mathcal { G } ^ { 2 } : H \\sim G \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 108, + 227, + 122 + ], + "score": 1.0, + "content": ", i.e.,", + "type": "text" + }, + { + "bbox": [ + 228, + 109, + 259, + 119 + ], + "score": 0.89, + "content": "G \\sim H", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 108, + 291, + 122 + ], + "score": 1.0, + "content": "implies", + "type": "text" + }, + { + "bbox": [ + 292, + 108, + 350, + 121 + ], + "score": 0.93, + "content": "{ \\dot { f } } ( G ) = f ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 350, + 108, + 354, + 122 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5, + "bbox_fs": [ + 105, + 96, + 506, + 122 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 123, + 504, + 145 + ], + "lines": [ + { + "bbox": [ + 106, + 123, + 505, + 136 + ], + "spans": [ + { + "bbox": [ + 106, + 123, + 411, + 136 + ], + "score": 1.0, + "content": "We can now state the reconstruction conjecture, which in short says that every", + "type": "text" + }, + { + "bbox": [ + 412, + 124, + 421, + 133 + ], + "score": 0.82, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 421, + 123, + 432, + 136 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 432, + 124, + 441, + 133 + ], + "score": 0.67, + "content": "\\mathfrak { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 123, + 462, + 136 + ], + "score": 1.0, + "content": "with", + "type": "text" + }, + { + "bbox": [ + 462, + 123, + 495, + 135 + ], + "score": 0.92, + "content": "| V | \\geq 3", + "type": "inline_equation" + }, + { + "bbox": [ + 495, + 123, + 505, + 136 + ], + "score": 1.0, + "content": "is", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 134, + 171, + 145 + ], + "spans": [ + { + "bbox": [ + 105, + 134, + 171, + 145 + ], + "score": 1.0, + "content": "reconstructible.", + "type": "text" + } + ], + "index": 5 + } + ], + "index": 4.5, + "bbox_fs": [ + 105, + 123, + 505, + 145 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 147, + 504, + 171 + ], + "lines": [ + { + "bbox": [ + 106, + 147, + 504, + 160 + ], + "spans": [ + { + "bbox": [ + 106, + 147, + 276, + 160 + ], + "score": 1.0, + "content": "Conjecture 1 (Kelly [52], Ulam [96]). Let", + "type": "text" + }, + { + "bbox": [ + 277, + 149, + 287, + 158 + ], + "score": 0.75, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 287, + 147, + 304, + 160 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 305, + 149, + 314, + 158 + ], + "score": 0.79, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 147, + 324, + 160 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 325, + 149, + 333, + 158 + ], + "score": 0.64, + "content": "\\mathfrak { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 334, + 147, + 504, + 160 + ], + "score": 1.0, + "content": "be two finite, undirected, simple graphs with", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 158, + 441, + 173 + ], + "spans": [ + { + "bbox": [ + 105, + 158, + 206, + 173 + ], + "score": 1.0, + "content": "at least three vertices. If", + "type": "text" + }, + { + "bbox": [ + 206, + 160, + 216, + 169 + ], + "score": 0.56, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 217, + 158, + 304, + 173 + ], + "score": 1.0, + "content": "is a reconstruction of", + "type": "text" + }, + { + "bbox": [ + 305, + 160, + 313, + 169 + ], + "score": 0.69, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 314, + 158, + 337, + 173 + ], + "score": 1.0, + "content": ", then", + "type": "text" + }, + { + "bbox": [ + 337, + 160, + 347, + 169 + ], + "score": 0.71, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 348, + 158, + 366, + 173 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 366, + 160, + 375, + 169 + ], + "score": 0.62, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 375, + 158, + 441, + 173 + ], + "score": 1.0, + "content": "are isomorphic.", + "type": "text" + } + ], + "index": 7 + } + ], + "index": 6.5, + "bbox_fs": [ + 105, + 147, + 504, + 173 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 173, + 505, + 251 + ], + "lines": [ + { + "bbox": [ + 106, + 173, + 505, + 186 + ], + "spans": [ + { + "bbox": [ + 106, + 173, + 505, + 186 + ], + "score": 1.0, + "content": "We note here that the reconstruction conjecture does not hold for directed graphs, hypergraphs, and", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 104, + 183, + 507, + 198 + ], + "spans": [ + { + "bbox": [ + 104, + 183, + 507, + 198 + ], + "score": 1.0, + "content": "infinite graphs [16, 92, 93]. 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In contrast, the conjecture has been", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 104, + 207, + 506, + 219 + ], + "spans": [ + { + "bbox": [ + 104, + 207, + 506, + 219 + ], + "score": 1.0, + "content": "proved for practical-relevant graph classes, such as disconnected graphs, regular graphs, trees, and", + "type": "text" + } + ], + "index": 11 + }, + { + "bbox": [ + 105, + 217, + 506, + 230 + ], + "spans": [ + { + "bbox": [ + 105, + 217, + 506, + 230 + ], + "score": 1.0, + "content": "outerplanar graphs [16]. Further, computational searches show that graphs with up to eleven vertices are", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 228, + 505, + 241 + ], + "spans": [ + { + "bbox": [ + 105, + 228, + 505, + 241 + ], + "score": 1.0, + "content": "reconstructible [68]. 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In practice,", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 446, + 504, + 459 + ], + "spans": [ + { + "bbox": [ + 105, + 446, + 265, + 459 + ], + "score": 1.0, + "content": "these results imply that for some fixed", + "type": "text" + }, + { + "bbox": [ + 265, + 447, + 272, + 456 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 273, + 446, + 497, + 459 + ], + "score": 1.0, + "content": "there will be graphs with not many more vertices than", + "type": "text" + }, + { + "bbox": [ + 497, + 446, + 504, + 456 + ], + "score": 0.77, + "content": "k", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 456, + 506, + 470 + ], + "spans": [ + { + "bbox": [ + 105, + 456, + 153, + 470 + ], + "score": 1.0, + "content": "that are not", + "type": "text" + }, + { + "bbox": [ + 153, + 457, + 160, + 467 + ], + "score": 0.83, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 160, + 456, + 258, + 470 + ], + "score": 1.0, + "content": "-reconstructible. 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In Appendix C, we discuss", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 480, + 187, + 490 + ], + "spans": [ + { + "bbox": [ + 106, + 480, + 187, + 490 + ], + "score": 1.0, + "content": "further such results.", + "type": "text" + } + ], + "index": 34 + } + ], + "index": 30, + "bbox_fs": [ + 105, + 392, + 507, + 490 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 505, + 294, + 519 + ], + "lines": [ + { + "bbox": [ + 104, + 504, + 295, + 520 + ], + "spans": [ + { + "bbox": [ + 104, + 504, + 295, + 520 + ], + "score": 1.0, + "content": "3 Reconstruction Neural Networks", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 106, + 529, + 505, + 585 + ], + "lines": [ + { + "bbox": [ + 105, + 528, + 505, + 542 + ], + "spans": [ + { + "bbox": [ + 105, + 528, + 438, + 542 + ], + "score": 1.0, + "content": "Building on the previous section, we propose two neural architectures based on graph", + "type": "text" + }, + { + "bbox": [ + 439, + 530, + 446, + 540 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 446, + 528, + 505, + 542 + ], + "score": 1.0, + "content": "-reconstruction", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 540, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 540, + 277, + 554 + ], + "score": 1.0, + "content": "and graph reconstruction. 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Secondly, we look at Full Reconstruction Neural Networks, where we", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 561, + 505, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 561, + 505, + 576 + ], + "score": 1.0, + "content": "leverage the Reconstruction Conjecture to build a most-expressive representation for the class of graphs", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 572, + 267, + 586 + ], + "spans": [ + { + "bbox": [ + 105, + 572, + 267, + 586 + ], + "score": 1.0, + "content": "of bounded size and unattributed edges.", + "type": "text" + } + ], + "index": 40 + } + ], + "index": 38, + "bbox_fs": [ + 105, + 528, + 506, + 586 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 589, + 505, + 669 + ], + "lines": [ + { + "bbox": [ + 107, + 588, + 505, + 602 + ], + "spans": [ + { + "bbox": [ + 107, + 591, + 113, + 600 + ], + "score": 0.75, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 588, + 365, + 602 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks. 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We also refer to Appendix", + "type": "text" + }, + { + "bbox": [ + 276, + 213, + 285, + 222 + ], + "score": 0.45, + "content": "\\mathrm { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 212, + 505, + 225 + ], + "score": 1.0, + "content": "for the proofs, a discussion on the model’s computational", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 223, + 374, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 374, + 235 + ], + "score": 1.0, + "content": "complexity, approximation methods, and relation to existing work.", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10 + }, + { + "type": "text", + "bbox": [ + 106, + 239, + 506, + 337 + ], + "lines": [ + { + "bbox": [ + 106, + 239, + 507, + 252 + ], + "spans": [ + { + "bbox": [ + 106, + 239, + 507, + 252 + ], + "score": 1.0, + "content": "Full Reconstruction Neural Networks. Here, we propose a recursive scheme based on the recon-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 250, + 505, + 262 + ], + "spans": [ + { + "bbox": [ + 106, + 250, + 505, + 262 + ], + "score": 1.0, + "content": "struction conjecture to build a most-expressive representation for graphs. Intuitively, Full Reconstruction", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 260, + 506, + 274 + ], + "spans": [ + { + "bbox": [ + 105, + 260, + 506, + 274 + ], + "score": 1.0, + "content": "Neural Networks recursively compute subgraph representations based on smaller subgraph represen-", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 271, + 506, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 196, + 289 + ], + "score": 1.0, + "content": "tations. Formally, let", + "type": "text" + }, + { + "bbox": [ + 197, + 272, + 345, + 288 + ], + "score": 0.92, + "content": "{ \\mathfrak { G } } _ { \\leq n ^ { * } } ^ { \\dagger } : = \\{ G \\in { \\mathfrak { G } } \\colon | V ( G ) | \\leq n ^ { * } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 271, + 506, + 289 + ], + "score": 1.0, + "content": "be the class of undirected graphs with", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 102, + 282, + 509, + 307 + ], + "spans": [ + { + "bbox": [ + 102, + 282, + 263, + 307 + ], + "score": 1.0, + "content": "unattributed edges and maximum size", + "type": "text" + }, + { + "bbox": [ + 263, + 290, + 275, + 300 + ], + "score": 0.87, + "content": "n ^ { * }", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 282, + 329, + 307 + ], + "score": 1.0, + "content": ". Further, let", + "type": "text" + }, + { + "bbox": [ + 329, + 287, + 438, + 302 + ], + "score": 0.9, + "content": "f _ { \\mathbf { W } } ^ { ( k ) } \\colon \\cup _ { m = 1 } ^ { \\infty } \\mathbb { R } ^ { m \\times d } \\mathbb { R } ^ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 282, + 509, + 307 + ], + "score": 1.0, + "content": "be a (row-wise)", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 299, + 506, + 316 + ], + "spans": [ + { + "bbox": [ + 104, + 299, + 261, + 316 + ], + "score": 1.0, + "content": "permutation invariant function and let", + "type": "text" + }, + { + "bbox": [ + 262, + 301, + 286, + 314 + ], + "score": 0.91, + "content": "h _ { \\{ i , j \\} }", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 299, + 506, + 316 + ], + "score": 1.0, + "content": "be a most-expressive representation of the two-vertex", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 311, + 504, + 326 + ], + "spans": [ + { + "bbox": [ + 105, + 311, + 221, + 326 + ], + "score": 1.0, + "content": "subgraph induced by vertices", + "type": "text" + }, + { + "bbox": [ + 222, + 313, + 226, + 322 + ], + "score": 0.76, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 311, + 244, + 326 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 244, + 313, + 250, + 324 + ], + "score": 0.78, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 311, + 401, + 326 + ], + "score": 1.0, + "content": ". We can now define the representation", + "type": "text" + }, + { + "bbox": [ + 401, + 312, + 451, + 325 + ], + "score": 0.92, + "content": "r ( G [ V ( G ) ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 311, + 495, + 326 + ], + "score": 1.0, + "content": "of a graph", + "type": "text" + }, + { + "bbox": [ + 495, + 313, + 504, + 322 + ], + "score": 0.79, + "content": "G", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 324, + 243, + 340 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 117, + 339 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 324, + 141, + 340 + ], + "score": 0.93, + "content": "{ \\mathfrak { G } } _ { \\leq n ^ { * } } ^ { \\dagger }", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 324, + 243, + 339 + ], + "score": 1.0, + "content": "in a recursive fashion as", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 15.5 + }, + { + "type": "interline_equation", + "bbox": [ + 152, + 339, + 449, + 374 + ], + "lines": [ + { + "bbox": [ + 152, + 339, + 449, + 374 + ], + "spans": [ + { + "bbox": [ + 152, + 339, + 449, + 374 + ], + "score": 0.93, + "content": "r ( G [ S ] ) = \\left\\{ \\begin{array} { l l } { f _ { \\mathbf { W } } ^ { ( | S | ) } \\left( \\mathbf { C o n c a r } ( \\left\\{ \\left\\{ r ( G [ S - v ] ) \\colon v \\in S \\right\\} \\right\\} ) \\right) , \\mathrm { ~ i f ~ } 3 \\leq | S | \\leq n } \\\\ { h _ { S } ( G [ S ] ) , \\quad \\quad \\quad \\quad \\quad \\quad \\mathrm { i f ~ } | S | = 2 . } \\end{array} \\right.", + "type": "interline_equation", + "image_path": "27c86e83bd6536eb4af812cf7d1031575a91752d0842bf6464337c0eb590f199.jpg" + } + ] + } + ], + "index": 21, + "virtual_lines": [ + { + "bbox": [ + 152, + 339, + 449, + 350.6666666666667 + ], + "spans": [], + "index": 20 + }, + { + "bbox": [ + 152, + 350.6666666666667, + 449, + 362.33333333333337 + ], + "spans": [], + "index": 21 + }, + { + "bbox": [ + 152, + 362.33333333333337, + 449, + 374.00000000000006 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 378, + 505, + 456 + ], + "lines": [ + { + "bbox": [ + 106, + 379, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 106, + 379, + 505, + 391 + ], + "score": 1.0, + "content": "Again, CONCAT is row-wise concatenation in some arbitrary order. Note that in practice, it is easier to", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "score": 1.0, + "content": "build the subgraph representations in a bottom-up fashion. First, use two-vertex subgraph representations", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 401, + 506, + 414 + ], + "spans": [ + { + "bbox": [ + 105, + 401, + 506, + 414 + ], + "score": 1.0, + "content": "to compute all three-vertex subgraph representations. Then, perform this inductively until we arrive at a", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 412, + 505, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 412, + 505, + 424 + ], + "score": 1.0, + "content": "single whole-graph representation. In Appendix E, we prove the expressive power of Full Reconstruction", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 421, + 506, + 435 + ], + "spans": [ + { + "bbox": [ + 104, + 421, + 506, + 435 + ], + "score": 1.0, + "content": "Neural Networks, i.e., we show how if the reconstruction conjecture holds, it is a most-expressive", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 434, + 506, + 446 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 506, + 446 + ], + "score": 1.0, + "content": "representation of undirected edge-unattributed graphs. Finally, we show its quadratic number of", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 445, + 432, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 432, + 457 + ], + "score": 1.0, + "content": "parameters, exponential computational complexity, and relation to existing work.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 26 + }, + { + "type": "title", + "bbox": [ + 107, + 469, + 331, + 484 + ], + "lines": [ + { + "bbox": [ + 105, + 469, + 332, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 469, + 332, + 485 + ], + "score": 1.0, + "content": "4 Reconstruction Graph Neural Networks", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 30 + }, + { + "type": "text", + "bbox": [ + 106, + 493, + 506, + 571 + ], + "lines": [ + { + "bbox": [ + 105, + 493, + 507, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 493, + 507, + 507 + ], + "score": 1.0, + "content": "Although Full Reconstruction Neural Networks provide a most-expressive representation for undi-", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 505, + 506, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 506, + 518 + ], + "score": 1.0, + "content": "rected, unattributed-edge graphs, they are impractical due to their computational cost. Similarly,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 107, + 516, + 505, + 528 + ], + "spans": [ + { + "bbox": [ + 107, + 516, + 113, + 526 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 516, + 505, + 528 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks are not scalable since increasing their expressive power requires", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 527, + 506, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 322, + 539 + ], + "score": 1.0, + "content": "computing most-expressive representations of larger", + "type": "text" + }, + { + "bbox": [ + 322, + 527, + 329, + 537 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 527, + 506, + 539 + ], + "score": 1.0, + "content": "-size subgraphs. Hence, to circumvent the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 537, + 505, + 550 + ], + "spans": [ + { + "bbox": [ + 106, + 537, + 436, + 550 + ], + "score": 1.0, + "content": "computational cost, we replace the most-expressive representations of subgraphs from", + "type": "text" + }, + { + "bbox": [ + 437, + 538, + 443, + 548 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 537, + 505, + 550 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 549, + 505, + 561 + ], + "spans": [ + { + "bbox": [ + 106, + 549, + 386, + 561 + ], + "score": 1.0, + "content": "Neural Networks with GNN representations, resulting in what we name", + "type": "text" + }, + { + "bbox": [ + 387, + 549, + 393, + 559 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 549, + 505, + 561 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. This", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 559, + 494, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 382, + 572 + ], + "score": 1.0, + "content": "change allows for scaling the model to larger subgraph sizes, such as", + "type": "text" + }, + { + "bbox": [ + 383, + 560, + 450, + 570 + ], + "score": 0.38, + "content": "n - 1 , n - 2 , . . .", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 559, + 494, + 572 + ], + "score": 1.0, + "content": ", et cetera.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 34 + }, + { + "type": "text", + "bbox": [ + 106, + 576, + 505, + 675 + ], + "lines": [ + { + "bbox": [ + 106, + 577, + 506, + 588 + ], + "spans": [ + { + "bbox": [ + 106, + 577, + 506, + 588 + ], + "score": 1.0, + "content": "Since, in the general case, graph reconstruction assumes most-expressive representations of subgraphs,", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 587, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 174, + 599 + ], + "score": 1.0, + "content": "it cannot capture", + "type": "text" + }, + { + "bbox": [ + 174, + 587, + 181, + 597 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 587, + 505, + 599 + ], + "score": 1.0, + "content": "-Reconstruction GNNs’ expressive power directly. Hence, we provide a theoretical", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 598, + 506, + 611 + ], + "spans": [ + { + "bbox": [ + 106, + 598, + 269, + 611 + ], + "score": 1.0, + "content": "characterization of the expressive power of", + "type": "text" + }, + { + "bbox": [ + 269, + 598, + 275, + 608 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 598, + 506, + 611 + ], + "score": 1.0, + "content": "-Reconstruction GNNs by coupling graph reconstruction and", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 609, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 106, + 609, + 506, + 622 + ], + "score": 1.0, + "content": "the GNN expressive power characterization based on the 1-WL algorithm. Nevertheless, in Appendix F.2,", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 619, + 506, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 619, + 241, + 633 + ], + "score": 1.0, + "content": "we devise conditions under which", + "type": "text" + }, + { + "bbox": [ + 242, + 620, + 248, + 630 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 619, + 434, + 633 + ], + "score": 1.0, + "content": "-Reconstruction GNNs have the same power as", + "type": "text" + }, + { + "bbox": [ + 435, + 620, + 441, + 630 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 619, + 506, + 633 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 630, + 505, + 643 + ], + "spans": [ + { + "bbox": [ + 105, + 630, + 505, + 643 + ], + "score": 1.0, + "content": "Neural Networks. Finally, we show how graph reconstruction can act as a (provably) powerful inductive", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 642, + 505, + 654 + ], + "spans": [ + { + "bbox": [ + 106, + 642, + 505, + 654 + ], + "score": 1.0, + "content": "bias for invariances to vertex removals, which boosts the performance of GNNs even in tasks where all", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 651, + 505, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 651, + 505, + 665 + ], + "score": 1.0, + "content": "graphs are already distinguishable by them (see Appendix G). We refer to Appendix F for a discussion", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 663, + 271, + 676 + ], + "spans": [ + { + "bbox": [ + 105, + 663, + 271, + 676 + ], + "score": 1.0, + "content": "on the model’s relation to existing work.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 42 + }, + { + "type": "text", + "bbox": [ + 105, + 678, + 504, + 704 + ], + "lines": [ + { + "bbox": [ + 104, + 676, + 505, + 695 + ], + "spans": [ + { + "bbox": [ + 104, + 676, + 157, + 695 + ], + "score": 1.0, + "content": "Formally, let", + "type": "text" + }, + { + "bbox": [ + 157, + 679, + 259, + 692 + ], + "score": 0.9, + "content": "f _ { \\mathbf { W } } \\colon \\cup _ { m = 1 } ^ { \\infty } \\mathbb { R } ^ { m \\times d } \\to \\mathbb { R } ^ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 676, + 455, + 695 + ], + "score": 1.0, + "content": "be a (row-wise) permutation invariant function and", + "type": "text" + }, + { + "bbox": [ + 455, + 678, + 505, + 692 + ], + "score": 0.88, + "content": "h _ { \\mathbf { W } } ^ { \\mathrm { G N N } } \\colon \\mathcal { G } \\to", + "type": "inline_equation" + } + ], + "index": 47 + }, + { + "bbox": [ + 106, + 689, + 497, + 706 + ], + "spans": [ + { + "bbox": [ + 106, + 691, + 130, + 702 + ], + "score": 0.88, + "content": "\\mathbb { R } ^ { 1 \\times d }", + "type": "inline_equation" + }, + { + "bbox": [ + 130, + 689, + 264, + 706 + ], + "score": 1.0, + "content": "a GNN representation. Then, for", + "type": "text" + }, + { + "bbox": [ + 264, + 692, + 330, + 704 + ], + "score": 0.92, + "content": "3 \\leq k < | V ( G ) |", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 689, + 342, + 706 + ], + "score": 1.0, + "content": ", a", + "type": "text" + }, + { + "bbox": [ + 342, + 693, + 348, + 702 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 689, + 497, + 706 + ], + "score": 1.0, + "content": "-Reconstruction GNN takes the form", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 47.5 + }, + { + "type": "interline_equation", + "bbox": [ + 182, + 705, + 426, + 725 + ], + "lines": [ + { + "bbox": [ + 182, + 705, + 426, + 725 + ], + "spans": [ + { + "bbox": [ + 182, + 705, + 426, + 725 + ], + "score": 0.89, + "content": "r _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) } ( G ) = f _ { \\mathbf { W } _ { 1 } } \\Big ( \\mathrm { C O N C A T } \\big ( \\{ \\{ h _ { \\mathbf { W } _ { 2 } } ^ { \\mathrm { G N N } } ( G [ S ] ) : S \\in \\mathcal { S } ^ { ( k ) } \\} \\} \\big ) \\Big ) ,", + "type": "interline_equation", + "image_path": "df13df724914f8373072dc4d5c6a2f5f95c40596dc04cb840689962de1e4a423.jpg" + } + ] + } + ], + "index": 49, + "virtual_lines": [ + { + "bbox": [ + 182, + 705, + 426, + 725 + ], + "spans": [], + "index": 49 + } + ] + } + ], + "page_idx": 4, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 302, + 741, + 309, + 750 + ], + "lines": [ + { + "bbox": [ + 301, + 740, + 310, + 753 + ], + "spans": [ + { + "bbox": [ + 301, + 740, + 310, + 753 + ], + "score": 1.0, + "content": "5", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 106, + 72, + 504, + 95 + ], + "lines": [], + "index": 0.5, + "bbox_fs": [ + 106, + 73, + 505, + 96 + ], + "lines_deleted": true + }, + { + "type": "text", + "bbox": [ + 106, + 99, + 504, + 122 + ], + "lines": [ + { + "bbox": [ + 103, + 93, + 506, + 117 + ], + "spans": [ + { + "bbox": [ + 103, + 93, + 468, + 117 + ], + "score": 1.0, + "content": "Proposition 1. Let fW be a universal approximator of multisets [112, 100, 79]. Then,", + "type": "text" + }, + { + "bbox": [ + 469, + 96, + 486, + 112 + ], + "score": 0.89, + "content": "r _ { \\mathbf { W } } ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 100, + 506, + 111 + ], + "score": 1.0, + "content": "can", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 110, + 387, + 122 + ], + "spans": [ + { + "bbox": [ + 105, + 110, + 313, + 122 + ], + "score": 1.0, + "content": "approximate a function if and only if the function is", + "type": "text" + }, + { + "bbox": [ + 321, + 110, + 387, + 122 + ], + "score": 1.0, + "content": "-reconstructible.", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 2.5, + "bbox_fs": [ + 103, + 93, + 506, + 122 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 128, + 271, + 140 + ], + "lines": [ + { + "bbox": [ + 105, + 126, + 272, + 142 + ], + "spans": [ + { + "bbox": [ + 105, + 126, + 272, + 142 + ], + "score": 1.0, + "content": "Moreover, we can observe the following.", + "type": "text" + } + ], + "index": 4 + } + ], + "index": 4, + "bbox_fs": [ + 105, + 126, + 272, + 142 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 142, + 502, + 165 + ], + "lines": [ + { + "bbox": [ + 105, + 141, + 505, + 155 + ], + "spans": [ + { + "bbox": [ + 105, + 141, + 397, + 155 + ], + "score": 1.0, + "content": "Observation 1 (Nydl [84], Kostochka and West [60]) ` . For any graph", + "type": "text" + }, + { + "bbox": [ + 397, + 142, + 406, + 152 + ], + "score": 0.76, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 407, + 141, + 419, + 155 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 420, + 142, + 427, + 153 + ], + "score": 0.76, + "content": "\\mathcal { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 141, + 445, + 155 + ], + "score": 1.0, + "content": ", its", + "type": "text" + }, + { + "bbox": [ + 445, + 142, + 452, + 152 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 141, + 475, + 155 + ], + "score": 1.0, + "content": "-deck", + "type": "text" + }, + { + "bbox": [ + 475, + 142, + 505, + 154 + ], + "score": 0.91, + "content": "\\mathcal { D } _ { k } ( G )", + "type": "inline_equation" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 151, + 262, + 165 + ], + "spans": [ + { + "bbox": [ + 105, + 151, + 165, + 165 + ], + "score": 1.0, + "content": "determines its", + "type": "text" + }, + { + "bbox": [ + 165, + 153, + 196, + 165 + ], + "score": 0.91, + "content": "\\left( k - 1 \\right)", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 151, + 218, + 165 + ], + "score": 1.0, + "content": "-deck", + "type": "text" + }, + { + "bbox": [ + 219, + 153, + 258, + 165 + ], + "score": 0.93, + "content": "{ \\mathcal { D } } _ { k - 1 } ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 258, + 151, + 262, + 165 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 6 + } + ], + "index": 5.5, + "bbox_fs": [ + 105, + 141, + 505, + 165 + ] + }, + { + "type": "text", + "bbox": [ + 108, + 171, + 505, + 197 + ], + "lines": [ + { + "bbox": [ + 106, + 171, + 505, + 183 + ], + "spans": [ + { + "bbox": [ + 106, + 171, + 403, + 183 + ], + "score": 1.0, + "content": "From Observation 1, we can derive a hierarchy in the expressive power of", + "type": "text" + }, + { + "bbox": [ + 404, + 172, + 410, + 181 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 411, + 171, + 505, + 183 + ], + "score": 1.0, + "content": "-Reconstruction Neural", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 102, + 176, + 474, + 203 + ], + "spans": [ + { + "bbox": [ + 102, + 176, + 280, + 203 + ], + "score": 1.0, + "content": "Networks with respect to the subgraph size", + "type": "text" + }, + { + "bbox": [ + 281, + 185, + 287, + 195 + ], + "score": 0.7, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 288, + 176, + 324, + 203 + ], + "score": 1.0, + "content": ". That is,", + "type": "text" + }, + { + "bbox": [ + 324, + 182, + 474, + 198 + ], + "score": 0.92, + "content": "r _ { \\mathbf { W } } ^ { ( 3 ) } \\preceq r _ { \\mathbf { W } } ^ { ( 4 ) } \\preceq \\cdots \\preceq r _ { \\mathbf { W } } ^ { ( n - 2 ) } \\preceq r _ { \\mathbf { W } } ^ { ( n - 1 ) }", + "type": "inline_equation" + } + ], + "index": 8 + } + ], + "index": 7.5, + "bbox_fs": [ + 102, + 171, + 505, + 203 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 201, + 504, + 235 + ], + "lines": [ + { + "bbox": [ + 105, + 200, + 505, + 214 + ], + "spans": [ + { + "bbox": [ + 105, + 200, + 505, + 214 + ], + "score": 1.0, + "content": "In Appendix D, we show how many existing architectures have their expressive power limited by", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 107, + 212, + 505, + 225 + ], + "spans": [ + { + "bbox": [ + 107, + 213, + 113, + 222 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 212, + 276, + 225 + ], + "score": 1.0, + "content": "-reconstruction. We also refer to Appendix", + "type": "text" + }, + { + "bbox": [ + 276, + 213, + 285, + 222 + ], + "score": 0.45, + "content": "\\mathrm { D }", + "type": "inline_equation" + }, + { + "bbox": [ + 285, + 212, + 505, + 225 + ], + "score": 1.0, + "content": "for the proofs, a discussion on the model’s computational", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 223, + 374, + 235 + ], + "spans": [ + { + "bbox": [ + 105, + 223, + 374, + 235 + ], + "score": 1.0, + "content": "complexity, approximation methods, and relation to existing work.", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 10, + "bbox_fs": [ + 105, + 200, + 505, + 235 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 239, + 506, + 337 + ], + "lines": [ + { + "bbox": [ + 106, + 239, + 507, + 252 + ], + "spans": [ + { + "bbox": [ + 106, + 239, + 507, + 252 + ], + "score": 1.0, + "content": "Full Reconstruction Neural Networks. Here, we propose a recursive scheme based on the recon-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 250, + 505, + 262 + ], + "spans": [ + { + "bbox": [ + 106, + 250, + 505, + 262 + ], + "score": 1.0, + "content": "struction conjecture to build a most-expressive representation for graphs. Intuitively, Full Reconstruction", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 260, + 506, + 274 + ], + "spans": [ + { + "bbox": [ + 105, + 260, + 506, + 274 + ], + "score": 1.0, + "content": "Neural Networks recursively compute subgraph representations based on smaller subgraph represen-", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 271, + 506, + 289 + ], + "spans": [ + { + "bbox": [ + 105, + 271, + 196, + 289 + ], + "score": 1.0, + "content": "tations. Formally, let", + "type": "text" + }, + { + "bbox": [ + 197, + 272, + 345, + 288 + ], + "score": 0.92, + "content": "{ \\mathfrak { G } } _ { \\leq n ^ { * } } ^ { \\dagger } : = \\{ G \\in { \\mathfrak { G } } \\colon | V ( G ) | \\leq n ^ { * } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 271, + 506, + 289 + ], + "score": 1.0, + "content": "be the class of undirected graphs with", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 102, + 282, + 509, + 307 + ], + "spans": [ + { + "bbox": [ + 102, + 282, + 263, + 307 + ], + "score": 1.0, + "content": "unattributed edges and maximum size", + "type": "text" + }, + { + "bbox": [ + 263, + 290, + 275, + 300 + ], + "score": 0.87, + "content": "n ^ { * }", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 282, + 329, + 307 + ], + "score": 1.0, + "content": ". Further, let", + "type": "text" + }, + { + "bbox": [ + 329, + 287, + 438, + 302 + ], + "score": 0.9, + "content": "f _ { \\mathbf { W } } ^ { ( k ) } \\colon \\cup _ { m = 1 } ^ { \\infty } \\mathbb { R } ^ { m \\times d } \\mathbb { R } ^ { t }", + "type": "inline_equation" + }, + { + "bbox": [ + 438, + 282, + 509, + 307 + ], + "score": 1.0, + "content": "be a (row-wise)", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 299, + 506, + 316 + ], + "spans": [ + { + "bbox": [ + 104, + 299, + 261, + 316 + ], + "score": 1.0, + "content": "permutation invariant function and let", + "type": "text" + }, + { + "bbox": [ + 262, + 301, + 286, + 314 + ], + "score": 0.91, + "content": "h _ { \\{ i , j \\} }", + "type": "inline_equation" + }, + { + "bbox": [ + 286, + 299, + 506, + 316 + ], + "score": 1.0, + "content": "be a most-expressive representation of the two-vertex", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 311, + 504, + 326 + ], + "spans": [ + { + "bbox": [ + 105, + 311, + 221, + 326 + ], + "score": 1.0, + "content": "subgraph induced by vertices", + "type": "text" + }, + { + "bbox": [ + 222, + 313, + 226, + 322 + ], + "score": 0.76, + "content": "i", + "type": "inline_equation" + }, + { + "bbox": [ + 227, + 311, + 244, + 326 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 244, + 313, + 250, + 324 + ], + "score": 0.78, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 250, + 311, + 401, + 326 + ], + "score": 1.0, + "content": ". We can now define the representation", + "type": "text" + }, + { + "bbox": [ + 401, + 312, + 451, + 325 + ], + "score": 0.92, + "content": "r ( G [ V ( G ) ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 311, + 495, + 326 + ], + "score": 1.0, + "content": "of a graph", + "type": "text" + }, + { + "bbox": [ + 495, + 313, + 504, + 322 + ], + "score": 0.79, + "content": "G", + "type": "inline_equation" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 324, + 243, + 340 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 117, + 339 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 324, + 141, + 340 + ], + "score": 0.93, + "content": "{ \\mathfrak { G } } _ { \\leq n ^ { * } } ^ { \\dagger }", + "type": "inline_equation" + }, + { + "bbox": [ + 141, + 324, + 243, + 339 + ], + "score": 1.0, + "content": "in a recursive fashion as", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 15.5, + "bbox_fs": [ + 102, + 239, + 509, + 340 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 152, + 339, + 449, + 374 + ], + "lines": [ + { + "bbox": [ + 152, + 339, + 449, + 374 + ], + "spans": [ + { + "bbox": [ + 152, + 339, + 449, + 374 + ], + "score": 0.93, + "content": "r ( G [ S ] ) = \\left\\{ \\begin{array} { l l } { f _ { \\mathbf { W } } ^ { ( | S | ) } \\left( \\mathbf { C o n c a r } ( \\left\\{ \\left\\{ r ( G [ S - v ] ) \\colon v \\in S \\right\\} \\right\\} ) \\right) , \\mathrm { ~ i f ~ } 3 \\leq | S | \\leq n } \\\\ { h _ { S } ( G [ S ] ) , \\quad \\quad \\quad \\quad \\quad \\quad \\mathrm { i f ~ } | S | = 2 . } \\end{array} \\right.", + "type": "interline_equation", + "image_path": "27c86e83bd6536eb4af812cf7d1031575a91752d0842bf6464337c0eb590f199.jpg" + } + ] + } + ], + "index": 21, + "virtual_lines": [ + { + "bbox": [ + 152, + 339, + 449, + 350.6666666666667 + ], + "spans": [], + "index": 20 + }, + { + "bbox": [ + 152, + 350.6666666666667, + 449, + 362.33333333333337 + ], + "spans": [], + "index": 21 + }, + { + "bbox": [ + 152, + 362.33333333333337, + 449, + 374.00000000000006 + ], + "spans": [], + "index": 22 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 378, + 505, + 456 + ], + "lines": [ + { + "bbox": [ + 106, + 379, + 505, + 391 + ], + "spans": [ + { + "bbox": [ + 106, + 379, + 505, + 391 + ], + "score": 1.0, + "content": "Again, CONCAT is row-wise concatenation in some arbitrary order. Note that in practice, it is easier to", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 402 + ], + "score": 1.0, + "content": "build the subgraph representations in a bottom-up fashion. First, use two-vertex subgraph representations", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 401, + 506, + 414 + ], + "spans": [ + { + "bbox": [ + 105, + 401, + 506, + 414 + ], + "score": 1.0, + "content": "to compute all three-vertex subgraph representations. Then, perform this inductively until we arrive at a", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 412, + 505, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 412, + 505, + 424 + ], + "score": 1.0, + "content": "single whole-graph representation. In Appendix E, we prove the expressive power of Full Reconstruction", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 104, + 421, + 506, + 435 + ], + "spans": [ + { + "bbox": [ + 104, + 421, + 506, + 435 + ], + "score": 1.0, + "content": "Neural Networks, i.e., we show how if the reconstruction conjecture holds, it is a most-expressive", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 434, + 506, + 446 + ], + "spans": [ + { + "bbox": [ + 105, + 434, + 506, + 446 + ], + "score": 1.0, + "content": "representation of undirected edge-unattributed graphs. Finally, we show its quadratic number of", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 445, + 432, + 457 + ], + "spans": [ + { + "bbox": [ + 105, + 445, + 432, + 457 + ], + "score": 1.0, + "content": "parameters, exponential computational complexity, and relation to existing work.", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 26, + "bbox_fs": [ + 104, + 379, + 506, + 457 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 469, + 331, + 484 + ], + "lines": [ + { + "bbox": [ + 105, + 469, + 332, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 469, + 332, + 485 + ], + "score": 1.0, + "content": "4 Reconstruction Graph Neural Networks", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 30 + }, + { + "type": "text", + "bbox": [ + 106, + 493, + 506, + 571 + ], + "lines": [ + { + "bbox": [ + 105, + 493, + 507, + 507 + ], + "spans": [ + { + "bbox": [ + 105, + 493, + 507, + 507 + ], + "score": 1.0, + "content": "Although Full Reconstruction Neural Networks provide a most-expressive representation for undi-", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 505, + 506, + 518 + ], + "spans": [ + { + "bbox": [ + 105, + 505, + 506, + 518 + ], + "score": 1.0, + "content": "rected, unattributed-edge graphs, they are impractical due to their computational cost. Similarly,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 107, + 516, + 505, + 528 + ], + "spans": [ + { + "bbox": [ + 107, + 516, + 113, + 526 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 516, + 505, + 528 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks are not scalable since increasing their expressive power requires", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 527, + 506, + 539 + ], + "spans": [ + { + "bbox": [ + 105, + 527, + 322, + 539 + ], + "score": 1.0, + "content": "computing most-expressive representations of larger", + "type": "text" + }, + { + "bbox": [ + 322, + 527, + 329, + 537 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 527, + 506, + 539 + ], + "score": 1.0, + "content": "-size subgraphs. Hence, to circumvent the", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 537, + 505, + 550 + ], + "spans": [ + { + "bbox": [ + 106, + 537, + 436, + 550 + ], + "score": 1.0, + "content": "computational cost, we replace the most-expressive representations of subgraphs from", + "type": "text" + }, + { + "bbox": [ + 437, + 538, + 443, + 548 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 443, + 537, + 505, + 550 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 106, + 549, + 505, + 561 + ], + "spans": [ + { + "bbox": [ + 106, + 549, + 386, + 561 + ], + "score": 1.0, + "content": "Neural Networks with GNN representations, resulting in what we name", + "type": "text" + }, + { + "bbox": [ + 387, + 549, + 393, + 559 + ], + "score": 0.78, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 393, + 549, + 505, + 561 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. This", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 559, + 494, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 382, + 572 + ], + "score": 1.0, + "content": "change allows for scaling the model to larger subgraph sizes, such as", + "type": "text" + }, + { + "bbox": [ + 383, + 560, + 450, + 570 + ], + "score": 0.38, + "content": "n - 1 , n - 2 , . . .", + "type": "inline_equation" + }, + { + "bbox": [ + 451, + 559, + 494, + 572 + ], + "score": 1.0, + "content": ", et cetera.", + "type": "text" + } + ], + "index": 37 + } + ], + "index": 34, + "bbox_fs": [ + 105, + 493, + 507, + 572 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 576, + 505, + 675 + ], + "lines": [ + { + "bbox": [ + 106, + 577, + 506, + 588 + ], + "spans": [ + { + "bbox": [ + 106, + 577, + 506, + 588 + ], + "score": 1.0, + "content": "Since, in the general case, graph reconstruction assumes most-expressive representations of subgraphs,", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 106, + 587, + 505, + 599 + ], + "spans": [ + { + "bbox": [ + 106, + 587, + 174, + 599 + ], + "score": 1.0, + "content": "it cannot capture", + "type": "text" + }, + { + "bbox": [ + 174, + 587, + 181, + 597 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 181, + 587, + 505, + 599 + ], + "score": 1.0, + "content": "-Reconstruction GNNs’ expressive power directly. Hence, we provide a theoretical", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 598, + 506, + 611 + ], + "spans": [ + { + "bbox": [ + 106, + 598, + 269, + 611 + ], + "score": 1.0, + "content": "characterization of the expressive power of", + "type": "text" + }, + { + "bbox": [ + 269, + 598, + 275, + 608 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 276, + 598, + 506, + 611 + ], + "score": 1.0, + "content": "-Reconstruction GNNs by coupling graph reconstruction and", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 609, + 506, + 622 + ], + "spans": [ + { + "bbox": [ + 106, + 609, + 506, + 622 + ], + "score": 1.0, + "content": "the GNN expressive power characterization based on the 1-WL algorithm. Nevertheless, in Appendix F.2,", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 619, + 506, + 633 + ], + "spans": [ + { + "bbox": [ + 105, + 619, + 241, + 633 + ], + "score": 1.0, + "content": "we devise conditions under which", + "type": "text" + }, + { + "bbox": [ + 242, + 620, + 248, + 630 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 249, + 619, + 434, + 633 + ], + "score": 1.0, + "content": "-Reconstruction GNNs have the same power as", + "type": "text" + }, + { + "bbox": [ + 435, + 620, + 441, + 630 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 442, + 619, + 506, + 633 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 630, + 505, + 643 + ], + "spans": [ + { + "bbox": [ + 105, + 630, + 505, + 643 + ], + "score": 1.0, + "content": "Neural Networks. Finally, we show how graph reconstruction can act as a (provably) powerful inductive", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 106, + 642, + 505, + 654 + ], + "spans": [ + { + "bbox": [ + 106, + 642, + 505, + 654 + ], + "score": 1.0, + "content": "bias for invariances to vertex removals, which boosts the performance of GNNs even in tasks where all", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 105, + 651, + 505, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 651, + 505, + 665 + ], + "score": 1.0, + "content": "graphs are already distinguishable by them (see Appendix G). 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Then, for", + "type": "text" + }, + { + "bbox": [ + 264, + 692, + 330, + 704 + ], + "score": 0.92, + "content": "3 \\leq k < | V ( G ) |", + "type": "inline_equation" + }, + { + "bbox": [ + 331, + 689, + 342, + 706 + ], + "score": 1.0, + "content": ", a", + "type": "text" + }, + { + "bbox": [ + 342, + 693, + 348, + 702 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 349, + 689, + 497, + 706 + ], + "score": 1.0, + "content": "-Reconstruction GNN takes the form", + "type": "text" + } + ], + "index": 48 + } + ], + "index": 47.5, + "bbox_fs": [ + 104, + 676, + 505, + 706 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 182, + 705, + 426, + 725 + ], + "lines": [ + { + "bbox": [ + 182, + 705, + 426, + 725 + ], + "spans": [ + { + "bbox": [ + 182, + 705, + 426, + 725 + ], + "score": 0.89, + "content": "r _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) } ( G ) = f _ { \\mathbf { W } _ { 1 } } \\Big ( \\mathrm { C O N C A T } \\big ( \\{ \\{ h _ { \\mathbf { W } _ { 2 } } ^ { \\mathrm { G N N } } ( G [ S ] ) : S \\in \\mathcal { S } ^ { ( k ) } \\} \\} \\big ) \\Big ) ,", + "type": "interline_equation", + "image_path": "df13df724914f8373072dc4d5c6a2f5f95c40596dc04cb840689962de1e4a423.jpg" + } + ] + } + ], + "index": 49, + "virtual_lines": [ + { + "bbox": [ + 182, + 705, + 426, + 725 + ], + "spans": [], + "index": 49 + } + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 72, + 505, + 95 + ], + "lines": [ + { + "bbox": [ + 105, + 70, + 505, + 86 + ], + "spans": [ + { + "bbox": [ + 105, + 70, + 171, + 86 + ], + "score": 1.0, + "content": "with parameters", + "type": "text" + }, + { + "bbox": [ + 172, + 72, + 245, + 85 + ], + "score": 0.92, + "content": "\\mathbf { W } = \\{ \\mathbf { W } _ { 1 } , \\mathbf { W } _ { 2 } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 70, + 274, + 86 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 275, + 72, + 293, + 83 + ], + "score": 0.91, + "content": "\\mathcal { S } ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 70, + 354, + 86 + ], + "score": 1.0, + "content": "is the set of all", + "type": "text" + }, + { + "bbox": [ + 354, + 73, + 361, + 83 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 70, + 421, + 86 + ], + "score": 1.0, + "content": "-size subsets of", + "type": "text" + }, + { + "bbox": [ + 422, + 73, + 446, + 85 + ], + "score": 0.92, + "content": "V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 447, + 70, + 505, + 86 + ], + "score": 1.0, + "content": ", and CONCAT", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 84, + 308, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 84, + 308, + 96 + ], + "score": 1.0, + "content": "is row-wise concatenation in some arbitrary order.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5 + }, + { + "type": "text", + "bbox": [ + 106, + 98, + 506, + 219 + ], + "lines": [ + { + "bbox": [ + 104, + 97, + 507, + 120 + ], + "spans": [ + { + "bbox": [ + 104, + 97, + 173, + 120 + ], + "score": 1.0, + "content": "Approximating", + "type": "text" + }, + { + "bbox": [ + 173, + 98, + 507, + 118 + ], + "score": 1.0, + "content": "r(k,GNN)W . 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[48, 79, 80, 112].", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 15.5 + }, + { + "type": "title", + "bbox": [ + 107, + 396, + 205, + 408 + ], + "lines": [ + { + "bbox": [ + 105, + 395, + 206, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 395, + 206, + 411 + ], + "score": 1.0, + "content": "4.1 Expressive power", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 506, + 484 + ], + "lines": [ + { + "bbox": [ + 105, + 417, + 505, + 430 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 273, + 430 + ], + "score": 1.0, + "content": "Now, we analyze the expressive power of", + "type": "text" + }, + { + "bbox": [ + 274, + 418, + 280, + 428 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 417, + 433, + 430 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. It is clear that", + "type": "text" + }, + { + "bbox": [ + 434, + 418, + 440, + 428 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 417, + 505, + 430 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 428, + 505, + 440 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 135, + 440 + ], + "score": 1.0, + "content": "GNNs", + "type": "text" + }, + { + "bbox": [ + 135, + 429, + 153, + 439 + ], + "score": 0.83, + "content": "\\preceq k", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 428, + 433, + 440 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks, however the relationship between", + "type": "text" + }, + { + "bbox": [ + 433, + 429, + 440, + 439 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 428, + 505, + 440 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "score": 1.0, + "content": "GNNs and GNNs is not that straightforward. At first, one expects that there exists a well-defined", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 451, + 505, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 451, + 222, + 462 + ], + "score": 1.0, + "content": "hierarchy—such as the one in", + "type": "text" + }, + { + "bbox": [ + 222, + 451, + 229, + 460 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 451, + 505, + 462 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks (see Observation 1)—between GNNs,", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 461, + 506, + 474 + ], + "spans": [ + { + "bbox": [ + 106, + 461, + 137, + 473 + ], + "score": 0.9, + "content": "( n - 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 461, + 232, + 474 + ], + "score": 1.0, + "content": "-Reconstruction GNNs,", + "type": "text" + }, + { + "bbox": [ + 232, + 461, + 263, + 473 + ], + "score": 0.91, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 461, + 506, + 474 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, and so on. However, there is no such", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 472, + 212, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 212, + 485 + ], + "score": 1.0, + "content": "hierarchy, as we see next.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23.5 + }, + { + "type": "text", + "bbox": [ + 106, + 488, + 505, + 544 + ], + "lines": [ + { + "bbox": [ + 106, + 489, + 506, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 248, + 501 + ], + "score": 1.0, + "content": "Are GNNs more expressive than", + "type": "text" + }, + { + "bbox": [ + 248, + 489, + 254, + 498 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 489, + 506, + 501 + ], + "score": 1.0, + "content": "-Reconstruction GNNs? It is well-known that GNNs cannot", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 499, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 106, + 499, + 505, + 513 + ], + "score": 1.0, + "content": "distinguish regular graphs [5, 78]. By leveraging the fact that regular graphs are reconstructible [53], we", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 510, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 510, + 505, + 524 + ], + "score": 1.0, + "content": "show that cycles and circular skip link (CSL) graphs—two classes of regular graphs—can indeed be", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 520, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 171, + 534 + ], + "score": 1.0, + "content": "distinguished by", + "type": "text" + }, + { + "bbox": [ + 172, + 522, + 178, + 531 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 520, + 322, + 534 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, implying that", + "type": "text" + }, + { + "bbox": [ + 322, + 522, + 329, + 531 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 520, + 505, + 534 + ], + "score": 1.0, + "content": "-Reconstruction GNNs are not less expressive", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 531, + 506, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 531, + 252, + 546 + ], + "score": 1.0, + "content": "than GNNs. We start by showing that", + "type": "text" + }, + { + "bbox": [ + 253, + 533, + 259, + 542 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 531, + 506, + 546 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish the class of cycle graphs.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 29 + }, + { + "type": "text", + "bbox": [ + 106, + 547, + 505, + 594 + ], + "lines": [ + { + "bbox": [ + 105, + 547, + 504, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 159, + 561 + ], + "score": 1.0, + "content": "Theorem 1 (", + "type": "text" + }, + { + "bbox": [ + 159, + 549, + 165, + 558 + ], + "score": 0.72, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 547, + 374, + 561 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish cycles). Let", + "type": "text" + }, + { + "bbox": [ + 374, + 549, + 405, + 559 + ], + "score": 0.89, + "content": "G \\in \\mathfrak { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 547, + 496, + 561 + ], + "score": 1.0, + "content": "be a cycle graph with", + "type": "text" + }, + { + "bbox": [ + 497, + 550, + 504, + 558 + ], + "score": 0.62, + "content": "n", + "type": "inline_equation" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 559, + 498, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 157, + 572 + ], + "score": 1.0, + "content": "vertices and", + "type": "text" + }, + { + "bbox": [ + 158, + 559, + 203, + 570 + ], + "score": 0.84, + "content": "k : = n - \\ell .", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 559, + 221, + 572 + ], + "score": 1.0, + "content": ". An", + "type": "text" + }, + { + "bbox": [ + 221, + 559, + 251, + 571 + ], + "score": 0.88, + "content": "( n - \\ell )", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 559, + 478, + 572 + ], + "score": 1.0, + "content": "-Reconstruction GNN assigns a unique representation to", + "type": "text" + }, + { + "bbox": [ + 479, + 560, + 488, + 569 + ], + "score": 0.63, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 559, + 498, + 572 + ], + "score": 1.0, + "content": "if", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 569, + 446, + 594 + ], + "spans": [ + { + "bbox": [ + 106, + 571, + 229, + 594 + ], + "score": 0.28, + "content": "\\begin{array} { r } { i ) \\ell < ( 1 + o ( 1 ) ) \\left( \\frac { 2 \\log n } { \\log \\log n } \\right) ^ { 1 / 2 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 569, + 258, + 594 + ], + "score": 1.0, + "content": "2 and ii)", + "type": "text" + }, + { + "bbox": [ + 258, + 572, + 446, + 594 + ], + "score": 0.81, + "content": "\\begin{array} { r } { \\begin{array} { r } { n \\geq ( \\ell - \\log \\ell + 1 ) \\biggl ( \\frac { e + e \\log \\ell + e + 1 } { ( \\ell - 1 ) \\log \\ell - 1 } \\biggr ) + 1 h o l d . } \\end{array} } \\end{array}", + "type": "inline_equation", + "image_path": "7da022d0c73f6a5a51a2e4c41f982bdee97a4e5cedbc178fad8bf83129d71c66.jpg" + } + ], + "index": 34 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 105, + 601, + 499, + 614 + ], + "lines": [ + { + "bbox": [ + 106, + 601, + 499, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 601, + 238, + 615 + ], + "score": 1.0, + "content": "The following results shows that", + "type": "text" + }, + { + "bbox": [ + 238, + 603, + 245, + 612 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 601, + 499, + 615 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish the class of CSL graphs.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 35 + }, + { + "type": "text", + "bbox": [ + 106, + 617, + 504, + 651 + ], + "lines": [ + { + "bbox": [ + 106, + 617, + 506, + 630 + ], + "spans": [ + { + "bbox": [ + 106, + 617, + 160, + 630 + ], + "score": 1.0, + "content": "Theorem 2", + "type": "text" + }, + { + "bbox": [ + 161, + 619, + 167, + 628 + ], + "score": 0.69, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 617, + 405, + 630 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish CSL graphs). Let", + "type": "text" + }, + { + "bbox": [ + 405, + 618, + 452, + 629 + ], + "score": 0.9, + "content": "G , H \\in \\mathfrak { S }", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 617, + 506, + 630 + ], + "score": 1.0, + "content": "be two non-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 628, + 502, + 641 + ], + "spans": [ + { + "bbox": [ + 105, + 628, + 470, + 641 + ], + "score": 1.0, + "content": "isomorphic circular skip link (CSL) graphs (a class of 4-regular graphs, cf. [23, 80]). Then,", + "type": "text" + }, + { + "bbox": [ + 471, + 629, + 502, + 641 + ], + "score": 0.91, + "content": "( n - 1 )", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 640, + 300, + 651 + ], + "spans": [ + { + "bbox": [ + 106, + 640, + 259, + 651 + ], + "score": 1.0, + "content": "Reconstruction GNNs can distinguish", + "type": "text" + }, + { + "bbox": [ + 259, + 640, + 268, + 650 + ], + "score": 0.74, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 640, + 287, + 651 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 287, + 640, + 297, + 650 + ], + "score": 0.73, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 640, + 300, + 651 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37 + }, + { + "type": "text", + "bbox": [ + 107, + 655, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 106, + 655, + 506, + 668 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 314, + 668 + ], + "score": 1.0, + "content": "Hence, if the conditions in Theorem 1 hold, GNNs", + "type": "text" + }, + { + "bbox": [ + 315, + 656, + 356, + 668 + ], + "score": 0.61, + "content": "\\not \\simeq ( n - \\ell )", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 655, + 506, + 668 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. Figure 2 (cf.", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 667, + 506, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 211, + 679 + ], + "score": 1.0, + "content": "Appendix F) depicts how", + "type": "text" + }, + { + "bbox": [ + 211, + 668, + 218, + 677 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 667, + 506, + 679 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish a graph that GNNs cannot. 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See Appendix F for the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 711, + 261, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 711, + 261, + 723 + ], + "score": 1.0, + "content": "complete proofs of Theorems 1 and 2.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 41.5 + } + ], + "page_idx": 5, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 302, + 741, + 309, + 750 + ], + "lines": [ + { + "bbox": [ + 302, + 741, + 310, + 752 + ], + "spans": [ + { + "bbox": [ + 302, + 741, + 310, + 752 + ], + "score": 1.0, + "content": "6", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "text", + "bbox": [ + 105, + 72, + 505, + 95 + ], + "lines": [ + { + "bbox": [ + 105, + 70, + 505, + 86 + ], + "spans": [ + { + "bbox": [ + 105, + 70, + 171, + 86 + ], + "score": 1.0, + "content": "with parameters", + "type": "text" + }, + { + "bbox": [ + 172, + 72, + 245, + 85 + ], + "score": 0.92, + "content": "\\mathbf { W } = \\{ \\mathbf { W } _ { 1 } , \\mathbf { W } _ { 2 } \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 70, + 274, + 86 + ], + "score": 1.0, + "content": ", where", + "type": "text" + }, + { + "bbox": [ + 275, + 72, + 293, + 83 + ], + "score": 0.91, + "content": "\\mathcal { S } ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 70, + 354, + 86 + ], + "score": 1.0, + "content": "is the set of all", + "type": "text" + }, + { + "bbox": [ + 354, + 73, + 361, + 83 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 70, + 421, + 86 + ], + "score": 1.0, + "content": "-size subsets of", + "type": "text" + }, + { + "bbox": [ + 422, + 73, + 446, + 85 + ], + "score": 0.92, + "content": "V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 447, + 70, + 505, + 86 + ], + "score": 1.0, + "content": ", and CONCAT", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 106, + 84, + 308, + 96 + ], + "spans": [ + { + "bbox": [ + 106, + 84, + 308, + 96 + ], + "score": 1.0, + "content": "is row-wise concatenation in some arbitrary order.", + "type": "text" + } + ], + "index": 1 + } + ], + "index": 0.5, + "bbox_fs": [ + 105, + 70, + 505, + 96 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 98, + 506, + 219 + ], + "lines": [ + { + "bbox": [ + 104, + 97, + 507, + 120 + ], + "spans": [ + { + "bbox": [ + 104, + 97, + 173, + 120 + ], + "score": 1.0, + "content": "Approximating", + "type": "text" + }, + { + "bbox": [ + 173, + 98, + 507, + 118 + ], + "score": 1.0, + "content": "r(k,GNN)W . By design, k-Reconstruction GNNs require computing GNN representations", + "type": "text" + } + ], + "index": 2 + }, + { + "bbox": [ + 105, + 112, + 506, + 127 + ], + "spans": [ + { + "bbox": [ + 105, + 112, + 132, + 127 + ], + "score": 1.0, + "content": "for all", + "type": "text" + }, + { + "bbox": [ + 139, + 112, + 506, + 127 + ], + "score": 1.0, + "content": "-vertex subgraphs, which might not be feasible for large graphs or datasets. 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We can learn the", + "type": "text" + }, + { + "bbox": [ + 298, + 193, + 304, + 203 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 304, + 191, + 506, + 205 + ], + "score": 1.0, + "content": "-Reconstruction GNN model over a training dataset", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 107, + 197, + 424, + 224 + ], + "spans": [ + { + "bbox": [ + 107, + 204, + 200, + 218 + ], + "score": 0.93, + "content": "{ \\mathcal D } ^ { ( \\mathrm { t r } ) } : = \\{ ( G _ { i } , y _ { i } ) \\} _ { i = 1 } ^ { N ^ { ( \\mathrm { t r } ) } }", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 197, + 279, + 224 + ], + "score": 1.0, + "content": "and a loss function", + "type": "text" + }, + { + "bbox": [ + 280, + 207, + 284, + 216 + ], + "score": 0.62, + "content": "l", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 197, + 424, + 224 + ], + "score": 1.0, + "content": "by minimizing the empirical risk", + "type": "text" + } + ], + "index": 9 + } + ], + "index": 5.5, + "bbox_fs": [ + 104, + 97, + 510, + 224 + ] + }, + { + "type": "interline_equation", + "bbox": [ + 189, + 226, + 422, + 262 + ], + "lines": [ + { + "bbox": [ + 189, + 226, + 422, + 262 + ], + "spans": [ + { + "bbox": [ + 189, + 226, + 422, + 262 + ], + "score": 0.93, + "content": "\\widehat { \\mathcal { R } } _ { k } ( \\mathcal { D } ^ { ( \\mathrm { t r } ) } ; \\mathbf { W } _ { 1 } , \\mathbf { W } _ { 2 } , \\mathbf { W } _ { 3 } ) = \\frac { 1 } { N ^ { \\mathrm { t r } } } \\sum _ { i = 1 } ^ { N ^ { \\mathrm { t r } } } l \\big ( r _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) } ( G _ { i } ) , y _ { i } \\big ) .", + "type": "interline_equation", + "image_path": "64f4cd4cbddf745c31a3d3d079e8cdf7ea8534bda5b8f2269411aa16e6d6840a.jpg" + } + ] + } + ], + "index": 10.5, + "virtual_lines": [ + { + "bbox": [ + 189, + 226, + 422, + 244.0 + ], + "spans": [], + "index": 10 + }, + { + "bbox": [ + 189, + 244.0, + 422, + 262.0 + ], + "spans": [], + "index": 11 + } + ] + }, + { + "type": "text", + "bbox": [ + 106, + 268, + 506, + 383 + ], + "lines": [ + { + "bbox": [ + 105, + 267, + 508, + 301 + ], + "spans": [ + { + "bbox": [ + 105, + 270, + 399, + 285 + ], + "score": 1.0, + "content": "Equation (1) is impractical for all but the smallest graphs, since", + "type": "text" + }, + { + "bbox": [ + 400, + 268, + 435, + 284 + ], + "score": 0.9, + "content": "r _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 267, + 508, + 301 + ], + "score": 1.0, + "content": "s a sum overusing a sam-", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 103, + 282, + 443, + 301 + ], + "spans": [ + { + "bbox": [ + 103, + 282, + 428, + 301 + ], + "score": 1.0, + "content": "all k-vertex induced subgraphs S(k) of G. Hence, we approximate r(k,GW", + "type": "text" + }, + { + "bbox": [ + 409, + 284, + 443, + 299 + ], + "score": 0.89, + "content": "r _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) }", + "type": "inline_equation" + } + ], + "index": 13 + }, + { + "bbox": [ + 118, + 292, + 505, + 334 + ], + "spans": [ + { + "bbox": [ + 118, + 295, + 149, + 314 + ], + "score": 1.0, + "content": "S (k)B", + "type": "text" + }, + { + "bbox": [ + 124, + 297, + 185, + 312 + ], + "score": 0.88, + "content": "{ \\mathcal S } _ { B } ^ { ( k ) } ~ \\subset ~ { \\mathcal S } ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 315, + 292, + 430, + 334 + ], + "score": 1.0, + "content": "at every gradient step, i.e.. 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However,", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 342, + 508, + 380 + ], + "spans": [ + { + "bbox": [ + 104, + 342, + 115, + 380 + ], + "score": 1.0, + "content": "if i.", + "type": "text" + }, + { + "bbox": [ + 115, + 345, + 168, + 357 + ], + "score": 0.91, + "content": "l ( \\rho _ { \\mathbf { W } _ { 1 } } ( a ) , y )", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 347, + 224, + 354 + ], + "score": 0.75, + "content": "a", + "type": "inline_equation" + }, + { + "bbox": [ + 396, + 342, + 508, + 380 + ], + "score": 1.0, + "content": "per upper bound of our loss,. In practice, many models", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 101, + 352, + 508, + 376 + ], + "spans": [ + { + "bbox": [ + 101, + 352, + 178, + 376 + ], + "score": 1.0, + "content": "e., 1/N tr PN tri=1 l", + "type": "text" + }, + { + "bbox": [ + 124, + 356, + 396, + 372 + ], + "score": 0.88, + "content": "\\begin{array} { r } { 1 / N ^ { \\mathrm { t r } } \\sum _ { i = 1 } ^ { N ^ { \\mathrm { t r } } } l \\big ( r _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) } ( G _ { i } ) , y _ { i } \\big ) \\leq 1 / N ^ { \\mathrm { t r } } \\sum _ { i = 1 } ^ { N ^ { \\mathrm { t r } } } l \\big ( \\widehat { r } _ { \\mathbf { W } } ^ { ( k , \\mathrm { G N N } ) } ( G _ { i } ) , y _ { i } \\big ) . } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 310, + 353, + 508, + 374 + ], + "score": 1.0, + "content": "tr1 l\u0000r (k,GNN)W (Gi), yi\u0001", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 369, + 507, + 383 + ], + "spans": [ + { + "bbox": [ + 105, + 369, + 507, + 383 + ], + "score": 1.0, + "content": "brely on this approximation and provide scalable and reliable training procedures, cf. [48, 79, 80, 112].", + "type": "text" + } + ], + "index": 19 + } + ], + "index": 15.5, + "bbox_fs": [ + 101, + 267, + 511, + 383 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 396, + 205, + 408 + ], + "lines": [ + { + "bbox": [ + 105, + 395, + 206, + 411 + ], + "spans": [ + { + "bbox": [ + 105, + 395, + 206, + 411 + ], + "score": 1.0, + "content": "4.1 Expressive power", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 20 + }, + { + "type": "text", + "bbox": [ + 106, + 417, + 506, + 484 + ], + "lines": [ + { + "bbox": [ + 105, + 417, + 505, + 430 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 273, + 430 + ], + "score": 1.0, + "content": "Now, we analyze the expressive power of", + "type": "text" + }, + { + "bbox": [ + 274, + 418, + 280, + 428 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 417, + 433, + 430 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. It is clear that", + "type": "text" + }, + { + "bbox": [ + 434, + 418, + 440, + 428 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 417, + 505, + 430 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 428, + 505, + 440 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 135, + 440 + ], + "score": 1.0, + "content": "GNNs", + "type": "text" + }, + { + "bbox": [ + 135, + 429, + 153, + 439 + ], + "score": 0.83, + "content": "\\preceq k", + "type": "inline_equation" + }, + { + "bbox": [ + 153, + 428, + 433, + 440 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks, however the relationship between", + "type": "text" + }, + { + "bbox": [ + 433, + 429, + 440, + 439 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 428, + 505, + 440 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 506, + 452 + ], + "score": 1.0, + "content": "GNNs and GNNs is not that straightforward. At first, one expects that there exists a well-defined", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 106, + 451, + 505, + 462 + ], + "spans": [ + { + "bbox": [ + 106, + 451, + 222, + 462 + ], + "score": 1.0, + "content": "hierarchy—such as the one in", + "type": "text" + }, + { + "bbox": [ + 222, + 451, + 229, + 460 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 451, + 505, + 462 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks (see Observation 1)—between GNNs,", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 106, + 461, + 506, + 474 + ], + "spans": [ + { + "bbox": [ + 106, + 461, + 137, + 473 + ], + "score": 0.9, + "content": "( n - 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 137, + 461, + 232, + 474 + ], + "score": 1.0, + "content": "-Reconstruction GNNs,", + "type": "text" + }, + { + "bbox": [ + 232, + 461, + 263, + 473 + ], + "score": 0.91, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 264, + 461, + 506, + 474 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, and so on. However, there is no such", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 472, + 212, + 485 + ], + "spans": [ + { + "bbox": [ + 105, + 472, + 212, + 485 + ], + "score": 1.0, + "content": "hierarchy, as we see next.", + "type": "text" + } + ], + "index": 26 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 417, + 506, + 485 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 488, + 505, + 544 + ], + "lines": [ + { + "bbox": [ + 106, + 489, + 506, + 501 + ], + "spans": [ + { + "bbox": [ + 106, + 489, + 248, + 501 + ], + "score": 1.0, + "content": "Are GNNs more expressive than", + "type": "text" + }, + { + "bbox": [ + 248, + 489, + 254, + 498 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 255, + 489, + 506, + 501 + ], + "score": 1.0, + "content": "-Reconstruction GNNs? It is well-known that GNNs cannot", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 106, + 499, + 505, + 513 + ], + "spans": [ + { + "bbox": [ + 106, + 499, + 505, + 513 + ], + "score": 1.0, + "content": "distinguish regular graphs [5, 78]. By leveraging the fact that regular graphs are reconstructible [53], we", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 106, + 510, + 505, + 524 + ], + "spans": [ + { + "bbox": [ + 106, + 510, + 505, + 524 + ], + "score": 1.0, + "content": "show that cycles and circular skip link (CSL) graphs—two classes of regular graphs—can indeed be", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 520, + 505, + 534 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 171, + 534 + ], + "score": 1.0, + "content": "distinguished by", + "type": "text" + }, + { + "bbox": [ + 172, + 522, + 178, + 531 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 520, + 322, + 534 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, implying that", + "type": "text" + }, + { + "bbox": [ + 322, + 522, + 329, + 531 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 520, + 505, + 534 + ], + "score": 1.0, + "content": "-Reconstruction GNNs are not less expressive", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 531, + 506, + 546 + ], + "spans": [ + { + "bbox": [ + 105, + 531, + 252, + 546 + ], + "score": 1.0, + "content": "than GNNs. We start by showing that", + "type": "text" + }, + { + "bbox": [ + 253, + 533, + 259, + 542 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 259, + 531, + 506, + 546 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish the class of cycle graphs.", + "type": "text" + } + ], + "index": 31 + } + ], + "index": 29, + "bbox_fs": [ + 105, + 489, + 506, + 546 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 547, + 505, + 594 + ], + "lines": [ + { + "bbox": [ + 105, + 547, + 504, + 561 + ], + "spans": [ + { + "bbox": [ + 105, + 547, + 159, + 561 + ], + "score": 1.0, + "content": "Theorem 1 (", + "type": "text" + }, + { + "bbox": [ + 159, + 549, + 165, + 558 + ], + "score": 0.72, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 166, + 547, + 374, + 561 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish cycles). Let", + "type": "text" + }, + { + "bbox": [ + 374, + 549, + 405, + 559 + ], + "score": 0.89, + "content": "G \\in \\mathfrak { G }", + "type": "inline_equation" + }, + { + "bbox": [ + 405, + 547, + 496, + 561 + ], + "score": 1.0, + "content": "be a cycle graph with", + "type": "text" + }, + { + "bbox": [ + 497, + 550, + 504, + 558 + ], + "score": 0.62, + "content": "n", + "type": "inline_equation" + } + ], + "index": 32 + }, + { + "bbox": [ + 106, + 559, + 498, + 572 + ], + "spans": [ + { + "bbox": [ + 106, + 559, + 157, + 572 + ], + "score": 1.0, + "content": "vertices and", + "type": "text" + }, + { + "bbox": [ + 158, + 559, + 203, + 570 + ], + "score": 0.84, + "content": "k : = n - \\ell .", + "type": "inline_equation" + }, + { + "bbox": [ + 203, + 559, + 221, + 572 + ], + "score": 1.0, + "content": ". An", + "type": "text" + }, + { + "bbox": [ + 221, + 559, + 251, + 571 + ], + "score": 0.88, + "content": "( n - \\ell )", + "type": "inline_equation" + }, + { + "bbox": [ + 252, + 559, + 478, + 572 + ], + "score": 1.0, + "content": "-Reconstruction GNN assigns a unique representation to", + "type": "text" + }, + { + "bbox": [ + 479, + 560, + 488, + 569 + ], + "score": 0.63, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 488, + 559, + 498, + 572 + ], + "score": 1.0, + "content": "if", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 569, + 446, + 594 + ], + "spans": [ + { + "bbox": [ + 106, + 571, + 229, + 594 + ], + "score": 0.28, + "content": "\\begin{array} { r } { i ) \\ell < ( 1 + o ( 1 ) ) \\left( \\frac { 2 \\log n } { \\log \\log n } \\right) ^ { 1 / 2 } } \\end{array}", + "type": "inline_equation" + }, + { + "bbox": [ + 229, + 569, + 258, + 594 + ], + "score": 1.0, + "content": "2 and ii)", + "type": "text" + }, + { + "bbox": [ + 258, + 572, + 446, + 594 + ], + "score": 0.81, + "content": "\\begin{array} { r } { \\begin{array} { r } { n \\geq ( \\ell - \\log \\ell + 1 ) \\biggl ( \\frac { e + e \\log \\ell + e + 1 } { ( \\ell - 1 ) \\log \\ell - 1 } \\biggr ) + 1 h o l d . } \\end{array} } \\end{array}", + "type": "inline_equation", + "image_path": "7da022d0c73f6a5a51a2e4c41f982bdee97a4e5cedbc178fad8bf83129d71c66.jpg" + } + ], + "index": 34 + } + ], + "index": 33, + "bbox_fs": [ + 105, + 547, + 504, + 594 + ] + }, + { + "type": "text", + "bbox": [ + 105, + 601, + 499, + 614 + ], + "lines": [ + { + "bbox": [ + 106, + 601, + 499, + 615 + ], + "spans": [ + { + "bbox": [ + 106, + 601, + 238, + 615 + ], + "score": 1.0, + "content": "The following results shows that", + "type": "text" + }, + { + "bbox": [ + 238, + 603, + 245, + 612 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 245, + 601, + 499, + 615 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish the class of CSL graphs.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 35, + "bbox_fs": [ + 106, + 601, + 499, + 615 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 617, + 504, + 651 + ], + "lines": [ + { + "bbox": [ + 106, + 617, + 506, + 630 + ], + "spans": [ + { + "bbox": [ + 106, + 617, + 160, + 630 + ], + "score": 1.0, + "content": "Theorem 2", + "type": "text" + }, + { + "bbox": [ + 161, + 619, + 167, + 628 + ], + "score": 0.69, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 168, + 617, + 405, + 630 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish CSL graphs). Let", + "type": "text" + }, + { + "bbox": [ + 405, + 618, + 452, + 629 + ], + "score": 0.9, + "content": "G , H \\in \\mathfrak { S }", + "type": "inline_equation" + }, + { + "bbox": [ + 452, + 617, + 506, + 630 + ], + "score": 1.0, + "content": "be two non-", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 105, + 628, + 502, + 641 + ], + "spans": [ + { + "bbox": [ + 105, + 628, + 470, + 641 + ], + "score": 1.0, + "content": "isomorphic circular skip link (CSL) graphs (a class of 4-regular graphs, cf. [23, 80]). Then,", + "type": "text" + }, + { + "bbox": [ + 471, + 629, + 502, + 641 + ], + "score": 0.91, + "content": "( n - 1 )", + "type": "inline_equation" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 640, + 300, + 651 + ], + "spans": [ + { + "bbox": [ + 106, + 640, + 259, + 651 + ], + "score": 1.0, + "content": "Reconstruction GNNs can distinguish", + "type": "text" + }, + { + "bbox": [ + 259, + 640, + 268, + 650 + ], + "score": 0.74, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 268, + 640, + 287, + 651 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 287, + 640, + 297, + 650 + ], + "score": 0.73, + "content": "H", + "type": "inline_equation" + }, + { + "bbox": [ + 297, + 640, + 300, + 651 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 38 + } + ], + "index": 37, + "bbox_fs": [ + 105, + 617, + 506, + 651 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 655, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 106, + 655, + 506, + 668 + ], + "spans": [ + { + "bbox": [ + 106, + 655, + 314, + 668 + ], + "score": 1.0, + "content": "Hence, if the conditions in Theorem 1 hold, GNNs", + "type": "text" + }, + { + "bbox": [ + 315, + 656, + 356, + 668 + ], + "score": 0.61, + "content": "\\not \\simeq ( n - \\ell )", + "type": "inline_equation" + }, + { + "bbox": [ + 357, + 655, + 506, + 668 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. Figure 2 (cf.", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 105, + 667, + 506, + 679 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 211, + 679 + ], + "score": 1.0, + "content": "Appendix F) depicts how", + "type": "text" + }, + { + "bbox": [ + 211, + 668, + 218, + 677 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 667, + 506, + 679 + ], + "score": 1.0, + "content": "-Reconstruction GNNs can distinguish a graph that GNNs cannot. The", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 104, + 677, + 506, + 691 + ], + "spans": [ + { + "bbox": [ + 104, + 677, + 506, + 691 + ], + "score": 1.0, + "content": "process essentially breaks the local symmetries that make GNNs struggle by removing one (or a few)", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 689, + 505, + 701 + ], + "spans": [ + { + "bbox": [ + 106, + 689, + 505, + 701 + ], + "score": 1.0, + "content": "vertices from the graph. By doing so, we arrive at distinguishable subgraphs. Since we can reconstruct", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 106, + 700, + 505, + 713 + ], + "spans": [ + { + "bbox": [ + 106, + 700, + 505, + 713 + ], + "score": 1.0, + "content": "the original graph with its unique subgraph representations, we can identify it. See Appendix F for the", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 711, + 261, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 711, + 261, + 723 + ], + "score": 1.0, + "content": "complete proofs of Theorems 1 and 2.", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 41.5, + "bbox_fs": [ + 104, + 655, + 506, + 723 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "text", + "bbox": [ + 107, + 72, + 504, + 105 + ], + "lines": [ + { + "bbox": [ + 105, + 72, + 505, + 85 + ], + "spans": [ + { + "bbox": [ + 105, + 72, + 237, + 85 + ], + "score": 1.0, + "content": "Are GNNs less expressive than", + "type": "text" + }, + { + "bbox": [ + 237, + 73, + 244, + 83 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 244, + 72, + 505, + 85 + ], + "score": 1.0, + "content": "-Reconstruction GNNs? We now show that GNNs can distinguish", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 83, + 506, + 97 + ], + "spans": [ + { + "bbox": [ + 105, + 83, + 151, + 97 + ], + "score": 1.0, + "content": "graphs that", + "type": "text" + }, + { + "bbox": [ + 152, + 84, + 158, + 93 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 159, + 83, + 291, + 97 + ], + "score": 1.0, + "content": "-Reconstruction GNNs with small", + "type": "text" + }, + { + "bbox": [ + 291, + 84, + 298, + 93 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 298, + 83, + 506, + 97 + ], + "score": 1.0, + "content": "cannot. We start with Proposition 2 stating that there", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 94, + 499, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 94, + 315, + 107 + ], + "score": 1.0, + "content": "exist some graphs that GNNs can distinguish which", + "type": "text" + }, + { + "bbox": [ + 315, + 95, + 322, + 104 + ], + "score": 0.83, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 94, + 459, + 107 + ], + "score": 1.0, + "content": "-Reconstruction GNNs with small", + "type": "text" + }, + { + "bbox": [ + 459, + 95, + 466, + 104 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 94, + 499, + 107 + ], + "score": 1.0, + "content": "cannot.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "text", + "bbox": [ + 107, + 109, + 368, + 121 + ], + "lines": [ + { + "bbox": [ + 105, + 107, + 369, + 123 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 171, + 123 + ], + "score": 1.0, + "content": "Proposition 2.", + "type": "text" + }, + { + "bbox": [ + 171, + 109, + 214, + 121 + ], + "score": 0.42, + "content": "G N N s \\Zt k", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 107, + 320, + 123 + ], + "score": 1.0, + "content": "-Reconstruction GNNs for", + "type": "text" + }, + { + "bbox": [ + 320, + 109, + 364, + 122 + ], + "score": 0.91, + "content": "k \\leq \\lceil n / 2 \\rceil", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 107, + 369, + 123 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 3 + }, + { + "type": "text", + "bbox": [ + 106, + 124, + 505, + 245 + ], + "lines": [ + { + "bbox": [ + 105, + 123, + 506, + 138 + ], + "spans": [ + { + "bbox": [ + 105, + 123, + 447, + 138 + ], + "score": 1.0, + "content": "On the other hand, the analysis is more interesting for larger subgraph sizes, e.g.,", + "type": "text" + }, + { + "bbox": [ + 447, + 126, + 473, + 135 + ], + "score": 0.86, + "content": "n - 1", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 123, + 506, + 138 + ], + "score": 1.0, + "content": ", where", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 136, + 505, + 147 + ], + "spans": [ + { + "bbox": [ + 106, + 136, + 505, + 147 + ], + "score": 1.0, + "content": "there are no known examples of (undirected, edge-unattributed) non-reconstructible graphs. There", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 146, + 506, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 146, + 506, + 160 + ], + "score": 1.0, + "content": "are graphs distinguishable by GNNs with at least one subgraph not distinguishable by them; see", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 158, + 505, + 170 + ], + "spans": [ + { + "bbox": [ + 106, + 158, + 505, + 170 + ], + "score": 1.0, + "content": "Appendix F. However, the analysis is whether the multiset of all subgraphs’ representations can", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 168, + 505, + 181 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 505, + 181 + ], + "score": 1.0, + "content": "distinguish the original graph. Since we could not find any counter-examples, we conjecture that every", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 178, + 505, + 192 + ], + "spans": [ + { + "bbox": [ + 105, + 178, + 346, + 192 + ], + "score": 1.0, + "content": "graph distinguishable by a GNN is also distinguishable by a", + "type": "text" + }, + { + "bbox": [ + 347, + 180, + 353, + 189 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 178, + 461, + 192 + ], + "score": 1.0, + "content": "-Reconstruction GNN with", + "type": "text" + }, + { + "bbox": [ + 461, + 179, + 505, + 190 + ], + "score": 0.91, + "content": "k = n - 1", + "type": "inline_equation" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 190, + 506, + 203 + ], + "spans": [ + { + "bbox": [ + 105, + 190, + 254, + 203 + ], + "score": 1.0, + "content": "or possibly more generally with any", + "type": "text" + }, + { + "bbox": [ + 255, + 191, + 262, + 200 + ], + "score": 0.76, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 190, + 329, + 203 + ], + "score": 1.0, + "content": "close enough to", + "type": "text" + }, + { + "bbox": [ + 329, + 192, + 336, + 200 + ], + "score": 0.6, + "content": "n", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 190, + 506, + 203 + ], + "score": 1.0, + "content": ". In Appendix F, we state and discuss the", + "type": "text" + } + ], + "index": 10 + }, + { + "bbox": [ + 105, + 201, + 505, + 213 + ], + "spans": [ + { + "bbox": [ + 105, + 201, + 495, + 213 + ], + "score": 1.0, + "content": "conjecture, which we name WL reconstruction conjecture. If true, the conjecture implies GNNs", + "type": "text" + }, + { + "bbox": [ + 495, + 202, + 505, + 212 + ], + "score": 0.65, + "content": "\\prec", + "type": "inline_equation" + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 212, + 504, + 223 + ], + "spans": [ + { + "bbox": [ + 106, + 212, + 137, + 223 + ], + "score": 0.91, + "content": "( n - 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 212, + 504, + 223 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. Moreover, if we use the original GNN representation together with", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 107, + 222, + 505, + 236 + ], + "spans": [ + { + "bbox": [ + 107, + 224, + 113, + 233 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 222, + 505, + 236 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, Theorems 1 and 2 imply that the resulting model is strictly more powerful", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 106, + 234, + 201, + 246 + ], + "spans": [ + { + "bbox": [ + 106, + 234, + 201, + 246 + ], + "score": 1.0, + "content": "than the original GNN.", + "type": "text" + } + ], + "index": 14 + } + ], + "index": 9 + }, + { + "type": "title", + "bbox": [ + 108, + 249, + 438, + 261 + ], + "lines": [ + { + "bbox": [ + 106, + 249, + 439, + 263 + ], + "spans": [ + { + "bbox": [ + 106, + 249, + 124, + 263 + ], + "score": 1.0, + "content": "Are", + "type": "text" + }, + { + "bbox": [ + 124, + 250, + 131, + 260 + ], + "score": 0.77, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 131, + 249, + 375, + 263 + ], + "score": 1.0, + "content": "-Reconstruction GNNs less expressive than higher-order (", + "type": "text" + }, + { + "bbox": [ + 375, + 252, + 381, + 260 + ], + "score": 0.52, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 381, + 249, + 439, + 263 + ], + "score": 1.0, + "content": "-WL) GNNs?", + "type": "text" + } + ], + "index": 15 + } + ], + "index": 15 + }, + { + "type": "text", + "bbox": [ + 107, + 266, + 506, + 321 + ], + "lines": [ + { + "bbox": [ + 106, + 266, + 506, + 279 + ], + "spans": [ + { + "bbox": [ + 106, + 266, + 441, + 279 + ], + "score": 1.0, + "content": "Recently a line of work, e.g., [6, 67, 76], explored higher-order GNNs aligning with the", + "type": "text" + }, + { + "bbox": [ + 441, + 268, + 448, + 277 + ], + "score": 0.73, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 448, + 266, + 506, + 279 + ], + "score": 1.0, + "content": "-WL hierarchy.", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 276, + 506, + 290 + ], + "spans": [ + { + "bbox": [ + 106, + 276, + 348, + 290 + ], + "score": 1.0, + "content": "Such architectures have, in principle, the same power as the", + "type": "text" + }, + { + "bbox": [ + 348, + 279, + 355, + 287 + ], + "score": 0.72, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 355, + 276, + 506, + 290 + ], + "score": 1.0, + "content": "-WL algorithm in distinguishing non-", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 288, + 505, + 300 + ], + "spans": [ + { + "bbox": [ + 105, + 288, + 308, + 300 + ], + "score": 1.0, + "content": "isomorphic graphs. Hence, one might wonder how", + "type": "text" + }, + { + "bbox": [ + 309, + 289, + 315, + 298 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 288, + 452, + 300 + ], + "score": 1.0, + "content": "-Reconstruction GNNs stack up to", + "type": "text" + }, + { + "bbox": [ + 452, + 290, + 460, + 298 + ], + "score": 0.79, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 288, + 505, + 300 + ], + "score": 1.0, + "content": "-WL-based", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 299, + 506, + 312 + ], + "spans": [ + { + "bbox": [ + 106, + 299, + 469, + 312 + ], + "score": 1.0, + "content": "algorithms. The following result shows that pairs of non-isomorphic graphs exist that a", + "type": "text" + }, + { + "bbox": [ + 469, + 299, + 502, + 311 + ], + "score": 0.91, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 299, + 506, + 312 + ], + "score": 1.0, + "content": "-", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 310, + 343, + 322 + ], + "spans": [ + { + "bbox": [ + 106, + 310, + 343, + 322 + ], + "score": 1.0, + "content": "Reconstruction GNN can distinguish but the 2-WL cannot.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 106, + 325, + 504, + 347 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 506, + 337 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 506, + 337 + ], + "score": 1.0, + "content": "Proposition 3. Let 2-GNNs be neural architectures with the same expressiveness as the 2-WL algorithm.", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 106, + 335, + 335, + 348 + ], + "spans": [ + { + "bbox": [ + 106, + 335, + 131, + 348 + ], + "score": 1.0, + "content": "Then,", + "type": "text" + }, + { + "bbox": [ + 131, + 336, + 163, + 348 + ], + "score": 0.9, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 335, + 228, + 348 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + }, + { + "bbox": [ + 228, + 336, + 332, + 348 + ], + "score": 0.75, + "content": "G N N \\ne 2 \\ – G N N s \\equiv 2 \\ – W L .", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 335, + 335, + 348 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22 + } + ], + "index": 21.5 + }, + { + "type": "text", + "bbox": [ + 107, + 351, + 504, + 374 + ], + "lines": [ + { + "bbox": [ + 106, + 351, + 505, + 363 + ], + "spans": [ + { + "bbox": [ + 106, + 351, + 244, + 363 + ], + "score": 1.0, + "content": "As a result of Proposition 3, using a", + "type": "text" + }, + { + "bbox": [ + 244, + 351, + 275, + 363 + ], + "score": 0.91, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 351, + 505, + 363 + ], + "score": 1.0, + "content": "-Reconstruction GNN representation together with a 2-GNN", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 361, + 306, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 361, + 306, + 375 + ], + "score": 1.0, + "content": "increases the original 2-GNN’s expressive power.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5 + }, + { + "type": "title", + "bbox": [ + 107, + 386, + 407, + 398 + ], + "lines": [ + { + "bbox": [ + 104, + 384, + 408, + 401 + ], + "spans": [ + { + "bbox": [ + 104, + 384, + 408, + 401 + ], + "score": 1.0, + "content": "4.2 Reconstruction as a powerful extra invariance for general graphs", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 107, + 406, + 506, + 450 + ], + "lines": [ + { + "bbox": [ + 105, + 406, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 105, + 406, + 506, + 419 + ], + "score": 1.0, + "content": "An essential feature of modern machine learning models is capturing invariances of the problem of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 417, + 506, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 506, + 429 + ], + "score": 1.0, + "content": "interest [63]. It reduces degrees of freedom while allowing for better generalization [13, 63]. GRL is", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 428, + 505, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 505, + 441 + ], + "score": 1.0, + "content": "predicated on invariance to vertex permutations, i.e., assigning the same representation to isomorphic", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 439, + 441, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 441, + 452 + ], + "score": 1.0, + "content": "graphs. But are there other invariances that could improve the generalization error?", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27.5 + }, + { + "type": "text", + "bbox": [ + 107, + 455, + 505, + 532 + ], + "lines": [ + { + "bbox": [ + 107, + 455, + 505, + 469 + ], + "spans": [ + { + "bbox": [ + 107, + 456, + 113, + 465 + ], + "score": 0.77, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 455, + 291, + 469 + ], + "score": 1.0, + "content": "-reconstruction is an extra invariance. Let", + "type": "text" + }, + { + "bbox": [ + 292, + 455, + 329, + 468 + ], + "score": 0.93, + "content": "P ( G , Y )", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 455, + 505, + 469 + ], + "score": 1.0, + "content": "be the joint probability of observing a graph", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 465, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 107, + 467, + 116, + 477 + ], + "score": 0.79, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 465, + 162, + 478 + ], + "score": 1.0, + "content": "with label", + "type": "text" + }, + { + "bbox": [ + 162, + 466, + 171, + 477 + ], + "score": 0.71, + "content": "Y", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 465, + 200, + 478 + ], + "score": 1.0, + "content": ". Any", + "type": "text" + }, + { + "bbox": [ + 200, + 467, + 207, + 476 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 207, + 465, + 360, + 478 + ], + "score": 1.0, + "content": "-reconstruction-based model, such as", + "type": "text" + }, + { + "bbox": [ + 360, + 467, + 367, + 476 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 367, + 465, + 505, + 478 + ], + "score": 1.0, + "content": "-Reconstruction Neural Networks", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 477, + 506, + 490 + ], + "spans": [ + { + "bbox": [ + 105, + 477, + 124, + 490 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 125, + 478, + 131, + 487 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 132, + 477, + 323, + 490 + ], + "score": 1.0, + "content": "-Reconstruction GNNs, by definition assumes", + "type": "text" + }, + { + "bbox": [ + 324, + 477, + 360, + 489 + ], + "score": 0.93, + "content": "P ( G , Y )", + "type": "inline_equation" + }, + { + "bbox": [ + 361, + 477, + 454, + 490 + ], + "score": 1.0, + "content": "to be invariant to the", + "type": "text" + }, + { + "bbox": [ + 455, + 478, + 461, + 488 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 462, + 477, + 506, + 490 + ], + "score": 1.0, + "content": "-deck, i.e.,", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 107, + 488, + 505, + 501 + ], + "spans": [ + { + "bbox": [ + 107, + 488, + 196, + 500 + ], + "score": 0.92, + "content": "P ( G , Y ) = P ( H , Y )", + "type": "inline_equation" + }, + { + "bbox": [ + 196, + 488, + 207, + 501 + ], + "score": 1.0, + "content": "if", + "type": "text" + }, + { + "bbox": [ + 208, + 488, + 282, + 500 + ], + "score": 0.92, + "content": "{ \\mathcal { D } } _ { k } ( G ) { \\dot { } } = { \\mathcal { D } } _ { k } ( H )", + "type": "inline_equation" + }, + { + "bbox": [ + 282, + 488, + 433, + 501 + ], + "score": 1.0, + "content": ". Hence, our neural architectures for", + "type": "text" + }, + { + "bbox": [ + 433, + 489, + 440, + 498 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 488, + 505, + 501 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 191, + 511 + ], + "score": 1.0, + "content": "Neural Networks and", + "type": "text" + }, + { + "bbox": [ + 191, + 500, + 198, + 509 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 498, + 505, + 511 + ], + "score": 1.0, + "content": "-Reconstruction GNNs directly define this extra invariance beyond permutation", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 510, + 506, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 510, + 506, + 523 + ], + "score": 1.0, + "content": "invariance. How we do know it is an extra invariance and not a consequence of permutation invariance?", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 520, + 434, + 533 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 434, + 533 + ], + "score": 1.0, + "content": "It does not hold on directed graphs [93], where permutation invariance still holds.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 33 + }, + { + "type": "text", + "bbox": [ + 106, + 537, + 505, + 648 + ], + "lines": [ + { + "bbox": [ + 106, + 537, + 506, + 549 + ], + "spans": [ + { + "bbox": [ + 106, + 537, + 495, + 549 + ], + "score": 1.0, + "content": "Hereditary property variance reduction. We now show that the invariance imposed by", + "type": "text" + }, + { + "bbox": [ + 495, + 537, + 502, + 547 + ], + "score": 0.74, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 537, + 506, + 549 + ], + "score": 1.0, + "content": "-", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 547, + 506, + 561 + ], + "spans": [ + { + "bbox": [ + 104, + 547, + 444, + 561 + ], + "score": 1.0, + "content": "reconstruction helps in tasks based on hereditary properties [17]. A graph property", + "type": "text" + }, + { + "bbox": [ + 445, + 548, + 467, + 560 + ], + "score": 0.91, + "content": "\\mu ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 468, + 547, + 506, + 561 + ], + "score": 1.0, + "content": "is called", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 558, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 302, + 572 + ], + "score": 1.0, + "content": "hereditary if it is invariant to vertex removals, i.e.", + "type": "text" + }, + { + "bbox": [ + 302, + 559, + 406, + 571 + ], + "score": 0.92, + "content": "\\mu ( G ) = \\mu ( G [ V ( G ) - v ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 558, + 445, + 572 + ], + "score": 1.0, + "content": "for every", + "type": "text" + }, + { + "bbox": [ + 446, + 559, + 487, + 571 + ], + "score": 0.92, + "content": "v \\in V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 558, + 506, + 572 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 107, + 568, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 107, + 570, + 134, + 581 + ], + "score": 0.89, + "content": "G \\in { \\mathcal { G } }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 568, + 396, + 585 + ], + "score": 1.0, + "content": ". By induction the property is invariant to every size subgraph, i.e.,", + "type": "text" + }, + { + "bbox": [ + 397, + 570, + 466, + 582 + ], + "score": 0.93, + "content": "{ \\dot { \\mu } } ( G ) = \\mu ( G [ S ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 568, + 506, + 585 + ], + "score": 1.0, + "content": "for every", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 107, + 580, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 107, + 581, + 178, + 594 + ], + "score": 0.9, + "content": "S \\in { \\mathcal { S } } ^ { ( k ) } , k \\in [ n ]", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 580, + 206, + 596 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 206, + 581, + 225, + 593 + ], + "score": 0.9, + "content": "\\mathcal { S } ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 580, + 286, + 596 + ], + "score": 1.0, + "content": "is the set of all", + "type": "text" + }, + { + "bbox": [ + 287, + 583, + 293, + 592 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 580, + 355, + 596 + ], + "score": 1.0, + "content": "-size subsets of", + "type": "text" + }, + { + "bbox": [ + 356, + 582, + 380, + 595 + ], + "score": 0.92, + "content": "V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 580, + 506, + 596 + ], + "score": 1.0, + "content": ". Here, the property is invariant", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 594, + 505, + 606 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 505, + 606 + ], + "score": 1.0, + "content": "to any given subgraph. For example, every subgraph of a planar graph is also planar, every subgraph", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 604, + 505, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 320, + 617 + ], + "score": 1.0, + "content": "of an acyclic graph is also acyclic, any subgraph of a", + "type": "text" + }, + { + "bbox": [ + 320, + 605, + 326, + 616 + ], + "score": 0.82, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 604, + 421, + 617 + ], + "score": 1.0, + "content": "-colorable graph is also", + "type": "text" + }, + { + "bbox": [ + 421, + 605, + 427, + 616 + ], + "score": 0.8, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 604, + 505, + 617 + ], + "score": 1.0, + "content": "-colorable. A more", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 615, + 505, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 505, + 628 + ], + "score": 1.0, + "content": "practically interesting (weaker) invariance would be invariance to a few vertex removals. Next we define", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 107, + 625, + 506, + 639 + ], + "spans": [ + { + "bbox": [ + 107, + 627, + 113, + 636 + ], + "score": 0.77, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 113, + 625, + 271, + 639 + ], + "score": 1.0, + "content": "-hereditary properties (a special case of a", + "type": "text" + }, + { + "bbox": [ + 271, + 627, + 280, + 637 + ], + "score": 0.81, + "content": "\\preceq", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 625, + 448, + 639 + ], + "score": 1.0, + "content": "-hereditary property). 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We start with Proposition 2 stating that there", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 94, + 499, + 107 + ], + "spans": [ + { + "bbox": [ + 105, + 94, + 315, + 107 + ], + "score": 1.0, + "content": "exist some graphs that GNNs can distinguish which", + "type": "text" + }, + { + "bbox": [ + 315, + 95, + 322, + 104 + ], + "score": 0.83, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 94, + 459, + 107 + ], + "score": 1.0, + "content": "-Reconstruction GNNs with small", + "type": "text" + }, + { + "bbox": [ + 459, + 95, + 466, + 104 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 94, + 499, + 107 + ], + "score": 1.0, + "content": "cannot.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1, + "bbox_fs": [ + 105, + 72, + 506, + 107 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 109, + 368, + 121 + ], + "lines": [ + { + "bbox": [ + 105, + 107, + 369, + 123 + ], + "spans": [ + { + "bbox": [ + 105, + 107, + 171, + 123 + ], + "score": 1.0, + "content": "Proposition 2.", + "type": "text" + }, + { + "bbox": [ + 171, + 109, + 214, + 121 + ], + "score": 0.42, + "content": "G N N s \\Zt k", + "type": "inline_equation" + }, + { + "bbox": [ + 215, + 107, + 320, + 123 + ], + "score": 1.0, + "content": "-Reconstruction GNNs for", + "type": "text" + }, + { + "bbox": [ + 320, + 109, + 364, + 122 + ], + "score": 0.91, + "content": "k \\leq \\lceil n / 2 \\rceil", + "type": "inline_equation" + }, + { + "bbox": [ + 365, + 107, + 369, + 123 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 3, + "bbox_fs": [ + 105, + 107, + 369, + 123 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 124, + 505, + 245 + ], + "lines": [ + { + "bbox": [ + 105, + 123, + 506, + 138 + ], + "spans": [ + { + "bbox": [ + 105, + 123, + 447, + 138 + ], + "score": 1.0, + "content": "On the other hand, the analysis is more interesting for larger subgraph sizes, e.g.,", + "type": "text" + }, + { + "bbox": [ + 447, + 126, + 473, + 135 + ], + "score": 0.86, + "content": "n - 1", + "type": "inline_equation" + }, + { + "bbox": [ + 473, + 123, + 506, + 138 + ], + "score": 1.0, + "content": ", where", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 106, + 136, + 505, + 147 + ], + "spans": [ + { + "bbox": [ + 106, + 136, + 505, + 147 + ], + "score": 1.0, + "content": "there are no known examples of (undirected, edge-unattributed) non-reconstructible graphs. There", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 146, + 506, + 160 + ], + "spans": [ + { + "bbox": [ + 105, + 146, + 506, + 160 + ], + "score": 1.0, + "content": "are graphs distinguishable by GNNs with at least one subgraph not distinguishable by them; see", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 106, + 158, + 505, + 170 + ], + "spans": [ + { + "bbox": [ + 106, + 158, + 505, + 170 + ], + "score": 1.0, + "content": "Appendix F. However, the analysis is whether the multiset of all subgraphs’ representations can", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 168, + 505, + 181 + ], + "spans": [ + { + "bbox": [ + 105, + 168, + 505, + 181 + ], + "score": 1.0, + "content": "distinguish the original graph. Since we could not find any counter-examples, we conjecture that every", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 178, + 505, + 192 + ], + "spans": [ + { + "bbox": [ + 105, + 178, + 346, + 192 + ], + "score": 1.0, + "content": "graph distinguishable by a GNN is also distinguishable by a", + "type": "text" + }, + { + "bbox": [ + 347, + 180, + 353, + 189 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 353, + 178, + 461, + 192 + ], + "score": 1.0, + "content": "-Reconstruction GNN with", + "type": "text" + }, + { + "bbox": [ + 461, + 179, + 505, + 190 + ], + "score": 0.91, + "content": "k = n - 1", + "type": "inline_equation" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 190, + 506, + 203 + ], + "spans": [ + { + "bbox": [ + 105, + 190, + 254, + 203 + ], + "score": 1.0, + "content": "or possibly more generally with any", + "type": "text" + }, + { + "bbox": [ + 255, + 191, + 262, + 200 + ], + "score": 0.76, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 262, + 190, + 329, + 203 + ], + "score": 1.0, + "content": "close enough to", + "type": "text" + }, + { + "bbox": [ + 329, + 192, + 336, + 200 + ], + "score": 0.6, + "content": "n", + "type": "inline_equation" + }, + { + "bbox": [ + 336, + 190, + 506, + 203 + ], + "score": 1.0, + "content": ". 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Hence, one might wonder how", + "type": "text" + }, + { + "bbox": [ + 309, + 289, + 315, + 298 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 316, + 288, + 452, + 300 + ], + "score": 1.0, + "content": "-Reconstruction GNNs stack up to", + "type": "text" + }, + { + "bbox": [ + 452, + 290, + 460, + 298 + ], + "score": 0.79, + "content": "\\kappa", + "type": "inline_equation" + }, + { + "bbox": [ + 460, + 288, + 505, + 300 + ], + "score": 1.0, + "content": "-WL-based", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 106, + 299, + 506, + 312 + ], + "spans": [ + { + "bbox": [ + 106, + 299, + 469, + 312 + ], + "score": 1.0, + "content": "algorithms. The following result shows that pairs of non-isomorphic graphs exist that a", + "type": "text" + }, + { + "bbox": [ + 469, + 299, + 502, + 311 + ], + "score": 0.91, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 299, + 506, + 312 + ], + "score": 1.0, + "content": "-", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 310, + 343, + 322 + ], + "spans": [ + { + "bbox": [ + 106, + 310, + 343, + 322 + ], + "score": 1.0, + "content": "Reconstruction GNN can distinguish but the 2-WL cannot.", + "type": "text" + } + ], + "index": 20 + } + ], + "index": 18, + "bbox_fs": [ + 105, + 266, + 506, + 322 + ] + }, + { + "type": "list", + "bbox": [ + 106, + 325, + 504, + 347 + ], + "lines": [ + { + "bbox": [ + 105, + 324, + 506, + 337 + ], + "spans": [ + { + "bbox": [ + 105, + 324, + 506, + 337 + ], + "score": 1.0, + "content": "Proposition 3. Let 2-GNNs be neural architectures with the same expressiveness as the 2-WL algorithm.", + "type": "text" + } + ], + "index": 21, + "is_list_end_line": true + }, + { + "bbox": [ + 106, + 335, + 335, + 348 + ], + "spans": [ + { + "bbox": [ + 106, + 335, + 131, + 348 + ], + "score": 1.0, + "content": "Then,", + "type": "text" + }, + { + "bbox": [ + 131, + 336, + 163, + 348 + ], + "score": 0.9, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 163, + 335, + 228, + 348 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + }, + { + "bbox": [ + 228, + 336, + 332, + 348 + ], + "score": 0.75, + "content": "G N N \\ne 2 \\ – G N N s \\equiv 2 \\ – W L .", + "type": "inline_equation" + }, + { + "bbox": [ + 333, + 335, + 335, + 348 + ], + "score": 1.0, + "content": ".", + "type": "text" + } + ], + "index": 22, + "is_list_start_line": true, + "is_list_end_line": true + } + ], + "index": 21.5, + "bbox_fs": [ + 105, + 324, + 506, + 348 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 351, + 504, + 374 + ], + "lines": [ + { + "bbox": [ + 106, + 351, + 505, + 363 + ], + "spans": [ + { + "bbox": [ + 106, + 351, + 244, + 363 + ], + "score": 1.0, + "content": "As a result of Proposition 3, using a", + "type": "text" + }, + { + "bbox": [ + 244, + 351, + 275, + 363 + ], + "score": 0.91, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 275, + 351, + 505, + 363 + ], + "score": 1.0, + "content": "-Reconstruction GNN representation together with a 2-GNN", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 361, + 306, + 375 + ], + "spans": [ + { + "bbox": [ + 105, + 361, + 306, + 375 + ], + "score": 1.0, + "content": "increases the original 2-GNN’s expressive power.", + "type": "text" + } + ], + "index": 24 + } + ], + "index": 23.5, + "bbox_fs": [ + 105, + 351, + 505, + 375 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 386, + 407, + 398 + ], + "lines": [ + { + "bbox": [ + 104, + 384, + 408, + 401 + ], + "spans": [ + { + "bbox": [ + 104, + 384, + 408, + 401 + ], + "score": 1.0, + "content": "4.2 Reconstruction as a powerful extra invariance for general graphs", + "type": "text" + } + ], + "index": 25 + } + ], + "index": 25 + }, + { + "type": "text", + "bbox": [ + 107, + 406, + 506, + 450 + ], + "lines": [ + { + "bbox": [ + 105, + 406, + 506, + 419 + ], + "spans": [ + { + "bbox": [ + 105, + 406, + 506, + 419 + ], + "score": 1.0, + "content": "An essential feature of modern machine learning models is capturing invariances of the problem of", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 417, + 506, + 429 + ], + "spans": [ + { + "bbox": [ + 105, + 417, + 506, + 429 + ], + "score": 1.0, + "content": "interest [63]. It reduces degrees of freedom while allowing for better generalization [13, 63]. GRL is", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 428, + 505, + 441 + ], + "spans": [ + { + "bbox": [ + 105, + 428, + 505, + 441 + ], + "score": 1.0, + "content": "predicated on invariance to vertex permutations, i.e., assigning the same representation to isomorphic", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 439, + 441, + 452 + ], + "spans": [ + { + "bbox": [ + 105, + 439, + 441, + 452 + ], + "score": 1.0, + "content": "graphs. But are there other invariances that could improve the generalization error?", + "type": "text" + } + ], + "index": 29 + } + ], + "index": 27.5, + "bbox_fs": [ + 105, + 406, + 506, + 452 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 455, + 505, + 532 + ], + "lines": [ + { + "bbox": [ + 107, + 455, + 505, + 469 + ], + "spans": [ + { + "bbox": [ + 107, + 456, + 113, + 465 + ], + "score": 0.77, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 114, + 455, + 291, + 469 + ], + "score": 1.0, + "content": "-reconstruction is an extra invariance. Let", + "type": "text" + }, + { + "bbox": [ + 292, + 455, + 329, + 468 + ], + "score": 0.93, + "content": "P ( G , Y )", + "type": "inline_equation" + }, + { + "bbox": [ + 329, + 455, + 505, + 469 + ], + "score": 1.0, + "content": "be the joint probability of observing a graph", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 107, + 465, + 505, + 478 + ], + "spans": [ + { + "bbox": [ + 107, + 467, + 116, + 477 + ], + "score": 0.79, + "content": "G", + "type": "inline_equation" + }, + { + "bbox": [ + 116, + 465, + 162, + 478 + ], + "score": 1.0, + "content": "with label", + "type": "text" + }, + { + "bbox": [ + 162, + 466, + 171, + 477 + ], + "score": 0.71, + "content": "Y", + "type": "inline_equation" + }, + { + "bbox": [ + 172, + 465, + 200, + 478 + ], + "score": 1.0, + "content": ". 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Hence, our neural architectures for", + "type": "text" + }, + { + "bbox": [ + 433, + 489, + 440, + 498 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 441, + 488, + 505, + 501 + ], + "score": 1.0, + "content": "-Reconstruction", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 105, + 498, + 505, + 511 + ], + "spans": [ + { + "bbox": [ + 105, + 498, + 191, + 511 + ], + "score": 1.0, + "content": "Neural Networks and", + "type": "text" + }, + { + "bbox": [ + 191, + 500, + 198, + 509 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 198, + 498, + 505, + 511 + ], + "score": 1.0, + "content": "-Reconstruction GNNs directly define this extra invariance beyond permutation", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 105, + 510, + 506, + 523 + ], + "spans": [ + { + "bbox": [ + 105, + 510, + 506, + 523 + ], + "score": 1.0, + "content": "invariance. How we do know it is an extra invariance and not a consequence of permutation invariance?", + "type": "text" + } + ], + "index": 35 + }, + { + "bbox": [ + 105, + 520, + 434, + 533 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 434, + 533 + ], + "score": 1.0, + "content": "It does not hold on directed graphs [93], where permutation invariance still holds.", + "type": "text" + } + ], + "index": 36 + } + ], + "index": 33, + "bbox_fs": [ + 105, + 455, + 506, + 533 + ] + }, + { + "type": "text", + "bbox": [ + 106, + 537, + 505, + 648 + ], + "lines": [ + { + "bbox": [ + 106, + 537, + 506, + 549 + ], + "spans": [ + { + "bbox": [ + 106, + 537, + 495, + 549 + ], + "score": 1.0, + "content": "Hereditary property variance reduction. We now show that the invariance imposed by", + "type": "text" + }, + { + "bbox": [ + 495, + 537, + 502, + 547 + ], + "score": 0.74, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 537, + 506, + 549 + ], + "score": 1.0, + "content": "-", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 104, + 547, + 506, + 561 + ], + "spans": [ + { + "bbox": [ + 104, + 547, + 444, + 561 + ], + "score": 1.0, + "content": "reconstruction helps in tasks based on hereditary properties [17]. A graph property", + "type": "text" + }, + { + "bbox": [ + 445, + 548, + 467, + 560 + ], + "score": 0.91, + "content": "\\mu ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 468, + 547, + 506, + 561 + ], + "score": 1.0, + "content": "is called", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 105, + 558, + 506, + 572 + ], + "spans": [ + { + "bbox": [ + 105, + 558, + 302, + 572 + ], + "score": 1.0, + "content": "hereditary if it is invariant to vertex removals, i.e.", + "type": "text" + }, + { + "bbox": [ + 302, + 559, + 406, + 571 + ], + "score": 0.92, + "content": "\\mu ( G ) = \\mu ( G [ V ( G ) - v ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 406, + 558, + 445, + 572 + ], + "score": 1.0, + "content": "for every", + "type": "text" + }, + { + "bbox": [ + 446, + 559, + 487, + 571 + ], + "score": 0.92, + "content": "v \\in V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 487, + 558, + 506, + 572 + ], + "score": 1.0, + "content": "and", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 107, + 568, + 506, + 585 + ], + "spans": [ + { + "bbox": [ + 107, + 570, + 134, + 581 + ], + "score": 0.89, + "content": "G \\in { \\mathcal { G } }", + "type": "inline_equation" + }, + { + "bbox": [ + 135, + 568, + 396, + 585 + ], + "score": 1.0, + "content": ". By induction the property is invariant to every size subgraph, i.e.,", + "type": "text" + }, + { + "bbox": [ + 397, + 570, + 466, + 582 + ], + "score": 0.93, + "content": "{ \\dot { \\mu } } ( G ) = \\mu ( G [ S ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 568, + 506, + 585 + ], + "score": 1.0, + "content": "for every", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 107, + 580, + 506, + 596 + ], + "spans": [ + { + "bbox": [ + 107, + 581, + 178, + 594 + ], + "score": 0.9, + "content": "S \\in { \\mathcal { S } } ^ { ( k ) } , k \\in [ n ]", + "type": "inline_equation" + }, + { + "bbox": [ + 178, + 580, + 206, + 596 + ], + "score": 1.0, + "content": "where", + "type": "text" + }, + { + "bbox": [ + 206, + 581, + 225, + 593 + ], + "score": 0.9, + "content": "\\mathcal { S } ^ { ( k ) }", + "type": "inline_equation" + }, + { + "bbox": [ + 225, + 580, + 286, + 596 + ], + "score": 1.0, + "content": "is the set of all", + "type": "text" + }, + { + "bbox": [ + 287, + 583, + 293, + 592 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 294, + 580, + 355, + 596 + ], + "score": 1.0, + "content": "-size subsets of", + "type": "text" + }, + { + "bbox": [ + 356, + 582, + 380, + 595 + ], + "score": 0.92, + "content": "V ( G )", + "type": "inline_equation" + }, + { + "bbox": [ + 380, + 580, + 506, + 596 + ], + "score": 1.0, + "content": ". Here, the property is invariant", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 105, + 594, + 505, + 606 + ], + "spans": [ + { + "bbox": [ + 105, + 594, + 505, + 606 + ], + "score": 1.0, + "content": "to any given subgraph. For example, every subgraph of a planar graph is also planar, every subgraph", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 604, + 505, + 617 + ], + "spans": [ + { + "bbox": [ + 105, + 604, + 320, + 617 + ], + "score": 1.0, + "content": "of an acyclic graph is also acyclic, any subgraph of a", + "type": "text" + }, + { + "bbox": [ + 320, + 605, + 326, + 616 + ], + "score": 0.82, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 326, + 604, + 421, + 617 + ], + "score": 1.0, + "content": "-colorable graph is also", + "type": "text" + }, + { + "bbox": [ + 421, + 605, + 427, + 616 + ], + "score": 0.8, + "content": "j", + "type": "inline_equation" + }, + { + "bbox": [ + 428, + 604, + 505, + 617 + ], + "score": 1.0, + "content": "-colorable. A more", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 615, + 505, + 628 + ], + "spans": [ + { + "bbox": [ + 105, + 615, + 505, + 628 + ], + "score": 1.0, + "content": "practically interesting (weaker) invariance would be invariance to a few vertex removals. Next we define", + "type": "text" + } + ], + "index": 44 + }, + { + "bbox": [ + 107, + 625, + 506, + 639 + ], + "spans": [ + { + "bbox": [ + 107, + 627, + 113, + 636 + ], + "score": 0.77, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 113, + 625, + 271, + 639 + ], + "score": 1.0, + "content": "-hereditary properties (a special case of a", + "type": "text" + }, + { + "bbox": [ + 271, + 627, + 280, + 637 + ], + "score": 0.81, + "content": "\\preceq", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 625, + 448, + 639 + ], + "score": 1.0, + "content": "-hereditary property). In short, a property is", + "type": "text" + }, + { + "bbox": [ + 448, + 627, + 454, + 636 + ], + "score": 0.81, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 454, + 625, + 506, + 639 + ], + "score": 1.0, + "content": "-hereditary if", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 637, + 359, + 650 + ], + "spans": [ + { + "bbox": [ + 105, + 637, + 316, + 650 + ], + "score": 1.0, + "content": "it is a hereditary property for graphs with more than", + "type": "text" + }, + { + "bbox": [ + 316, + 637, + 322, + 647 + ], + "score": 0.76, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 322, + 637, + 359, + 650 + ], + "score": 1.0, + "content": "vertices.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 41.5, + "bbox_fs": [ + 104, + 537, + 506, + 650 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 651, + 505, + 685 + ], + "lines": [ + { + "bbox": [ + 105, + 650, + 505, + 665 + ], + "spans": [ + { + "bbox": [ + 105, + 650, + 164, + 665 + ], + "score": 1.0, + "content": "Definition 5", + "type": "text" + }, + { + "bbox": [ + 165, + 652, + 171, + 662 + ], + "score": 0.67, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 171, + 650, + 261, + 665 + ], + "score": 1.0, + "content": "-hereditary property).", + "type": "text" + }, + { + "bbox": [ + 261, + 653, + 270, + 662 + ], + "score": 0.39, + "content": "A", + "type": "inline_equation" + }, + { + "bbox": [ + 270, + 650, + 337, + 665 + ], + "score": 1.0, + "content": "graph property", + "type": "text" + }, + { + "bbox": [ + 338, + 652, + 387, + 663 + ], + "score": 0.9, + "content": "\\mu \\colon \\mathcal G \\ \\ \\mathcal { y }", + "type": "inline_equation" + }, + { + "bbox": [ + 387, + 650, + 443, + 665 + ], + "score": 1.0, + "content": "is said to be", + "type": "text" + }, + { + "bbox": [ + 444, + 652, + 450, + 662 + ], + "score": 0.61, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 450, + 650, + 496, + 665 + ], + "score": 1.0, + "content": "-hereditary", + "type": "text" + }, + { + "bbox": [ + 497, + 652, + 505, + 663 + ], + "score": 0.35, + "content": "i f", + "type": "inline_equation" + } + ], + "index": 47 + }, + { + "bbox": [ + 107, + 662, + 506, + 676 + ], + "spans": [ + { + "bbox": [ + 107, + 663, + 209, + 675 + ], + "score": 0.89, + "content": "\\mu ( G ) = \\mu ( G [ V ( G ) - v ] )", + "type": "inline_equation" + }, + { + "bbox": [ + 210, + 662, + 213, + 676 + ], + "score": 1.0, + "content": ",", + "type": "text" + }, + { + "bbox": [ + 213, + 663, + 383, + 675 + ], + "score": 0.9, + "content": "\\forall v \\in V ( G ) , G \\in \\{ H \\in { \\mathcal { G } } : | V ( H ) | > \\delta \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 384, + 662, + 418, + 676 + ], + "score": 1.0, + "content": ". 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[28], where we want to determine", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 106, + 323, + 505, + 336 + ], + "spans": [ + { + "bbox": [ + 106, + 323, + 505, + 336 + ], + "score": 1.0, + "content": "whether a graph is connected, its diameter, and its spectral radius. See Appendix H for datasets statistics.", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 16, + "bbox_fs": [ + 105, + 279, + 506, + 336 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 335, + 505, + 389 + ], + "lines": [ + { + "bbox": [ + 106, + 334, + 506, + 346 + ], + "spans": [ + { + "bbox": [ + 106, + 334, + 352, + 346 + ], + "score": 1.0, + "content": "Real-world datasets. To address Q2 and Q3, we evaluated", + "type": "text" + }, + { + "bbox": [ + 353, + 335, + 360, + 344 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 360, + 334, + 506, + 346 + ], + "score": 1.0, + "content": "-Reconstruction GNNs on a diverse", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 106, + 345, + 506, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 345, + 506, + 358 + ], + "score": 1.0, + "content": "set of large-scale, standard benchmark instances [49, 74]. Specifically, we used the ZINC (10K) [32],", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 356, + 506, + 369 + ], + "spans": [ + { + "bbox": [ + 105, + 356, + 506, + 369 + ], + "score": 1.0, + "content": "ALCHEMY (10K) [23], OGBG-MOLFREESOLV, OGBG-MOLESOL, and OGBG-MOLLIPO [49] regression", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 366, + 507, + 379 + ], + "spans": [ + { + "bbox": [ + 105, + 366, + 507, + 379 + ], + "score": 1.0, + "content": "datasets. For the case of graph classification, we used OGBG-MOLHIV, OGBG-MOLPCBA, OGBG-TOX21,", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 106, + 378, + 372, + 390 + ], + "spans": [ + { + "bbox": [ + 106, + 378, + 274, + 390 + ], + "score": 1.0, + "content": "and OGBG-TOXCAST [49]. See Appendix", + "type": "text" + }, + { + "bbox": [ + 275, + 379, + 284, + 388 + ], + "score": 0.29, + "content": "_ \\mathrm { H }", + "type": "inline_equation" + }, + { + "bbox": [ + 284, + 378, + 372, + 390 + ], + "score": 1.0, + "content": "for datasets statistics.", + "type": "text" + } + ], + "index": 23 + } + ], + "index": 21, + "bbox_fs": [ + 105, + 334, + 507, + 390 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 389, + 505, + 466 + ], + "lines": [ + { + "bbox": [ + 105, + 389, + 505, + 401 + ], + "spans": [ + { + "bbox": [ + 105, + 389, + 505, + 401 + ], + "score": 1.0, + "content": "Neural architectures. We used the GIN [106], GCN [56], and the PNA [28] architectures as GNN", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 399, + 505, + 412 + ], + "spans": [ + { + "bbox": [ + 105, + 399, + 505, + 412 + ], + "score": 1.0, + "content": "baselines. We always replicated the exact architectures from the original paper, building on the respective", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 105, + 410, + 506, + 424 + ], + "spans": [ + { + "bbox": [ + 105, + 410, + 506, + 424 + ], + "score": 1.0, + "content": "PyTorch Geometric implementation [35]. For the OGBG regression datasets, we noticed how using a", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 422, + 506, + 434 + ], + "spans": [ + { + "bbox": [ + 105, + 422, + 506, + 434 + ], + "score": 1.0, + "content": "jumping knowledge layer yields better validation and test results for GIN and GCN. Thus we made this", + "type": "text" + } + ], + "index": 27 + }, + { + "bbox": [ + 105, + 432, + 504, + 444 + ], + "spans": [ + { + "bbox": [ + 105, + 432, + 383, + 444 + ], + "score": 1.0, + "content": "small change. For each of these three architectures, we implemented", + "type": "text" + }, + { + "bbox": [ + 383, + 433, + 390, + 442 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 390, + 432, + 497, + 444 + ], + "score": 1.0, + "content": "-Reconstruction GNNs for", + "type": "text" + }, + { + "bbox": [ + 497, + 433, + 504, + 442 + ], + "score": 0.77, + "content": "k", + "type": "inline_equation" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 443, + 506, + 456 + ], + "spans": [ + { + "bbox": [ + 105, + 443, + 117, + 456 + ], + "score": 1.0, + "content": "in", + "type": "text" + }, + { + "bbox": [ + 117, + 443, + 235, + 455 + ], + "score": 0.89, + "content": "\\{ n - 1 , \\bar { n } - 2 , n - 3 , \\lceil n / 2 \\rceil \\}", + "type": "inline_equation" + }, + { + "bbox": [ + 235, + 443, + 506, + 456 + ], + "score": 1.0, + "content": "using a Deep Sets function [112] over the exact same original GNN", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 455, + 299, + 467 + ], + "spans": [ + { + "bbox": [ + 105, + 455, + 299, + 467 + ], + "score": 1.0, + "content": "architecture. For more details, see Appendix G.", + "type": "text" + } + ], + "index": 30 + } + ], + "index": 27, + "bbox_fs": [ + 105, + 389, + 506, + 467 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 466, + 505, + 520 + ], + "lines": [ + { + "bbox": [ + 106, + 464, + 506, + 478 + ], + "spans": [ + { + "bbox": [ + 106, + 464, + 506, + 478 + ], + "score": 1.0, + "content": "Experimental setup. To establish fair comparisons, we retain all hyperparameters and training", + "type": "text" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 476, + 506, + 488 + ], + "spans": [ + { + "bbox": [ + 105, + 476, + 347, + 488 + ], + "score": 1.0, + "content": "procedures from the original GNNs to train the corresponding", + "type": "text" + }, + { + "bbox": [ + 348, + 477, + 354, + 486 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 354, + 476, + 506, + 488 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. Tables 1 and 2", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 487, + 506, + 500 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 506, + 500 + ], + "score": 1.0, + "content": "and Table 6 in Appendix I present results with the same number of runs as previous work [28, 32, 49, 77,", + "type": "text" + } + ], + "index": 33 + }, + { + "bbox": [ + 106, + 498, + 505, + 510 + ], + "spans": [ + { + "bbox": [ + 106, + 498, + 505, + 510 + ], + "score": 1.0, + "content": "98], i.e., five for all datasets execpt the OGBG datasets, where we use ten runs. For more details, such as", + "type": "text" + } + ], + "index": 34 + }, + { + "bbox": [ + 106, + 508, + 505, + 521 + ], + "spans": [ + { + "bbox": [ + 106, + 508, + 273, + 521 + ], + "score": 1.0, + "content": "the number of subgraphs sampled for each", + "type": "text" + }, + { + "bbox": [ + 274, + 509, + 280, + 519 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 281, + 508, + 505, + 521 + ], + "score": 1.0, + "content": "-Reconstruction GNN and each dataset, see Appendix G.", + "type": "text" + } + ], + "index": 35 + } + ], + "index": 33, + "bbox_fs": [ + 105, + 464, + 506, + 521 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 520, + 505, + 619 + ], + "lines": [ + { + "bbox": [ + 105, + 519, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 105, + 519, + 505, + 532 + ], + "score": 1.0, + "content": "Non-GNN baselines. For the graph property tasks, original work used vertex identifiers or Laplacian", + "type": "text" + } + ], + "index": 36 + }, + { + "bbox": [ + 106, + 530, + 506, + 543 + ], + "spans": [ + { + "bbox": [ + 106, + 530, + 506, + 543 + ], + "score": 1.0, + "content": "embeddings to make GNNs solve them. This trick is effective for the tasks but violates an important", + "type": "text" + } + ], + "index": 37 + }, + { + "bbox": [ + 106, + 542, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 106, + 542, + 505, + 554 + ], + "score": 1.0, + "content": "premise of graph representations, invariance to vertex permutations. To illustrate this line of work, we", + "type": "text" + } + ], + "index": 38 + }, + { + "bbox": [ + 104, + 551, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 104, + 551, + 506, + 565 + ], + "score": 1.0, + "content": "compare against Positional GIN, which uses Laplacian embeddings [32] for the CSL task and vertex", + "type": "text" + } + ], + "index": 39 + }, + { + "bbox": [ + 106, + 563, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 106, + 563, + 408, + 576 + ], + "score": 1.0, + "content": "identifiers for the others [98, 28]. To compare against other methods that like", + "type": "text" + }, + { + "bbox": [ + 408, + 564, + 415, + 573 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 415, + 563, + 506, + 576 + ], + "score": 1.0, + "content": "-Reconstruction GNNs", + "type": "text" + } + ], + "index": 40 + }, + { + "bbox": [ + 106, + 575, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 106, + 575, + 506, + 587 + ], + "score": 1.0, + "content": "are invariant to vertex permutations and increase the expressive power of GNNs, we compare against", + "type": "text" + } + ], + "index": 41 + }, + { + "bbox": [ + 106, + 585, + 505, + 598 + ], + "spans": [ + { + "bbox": [ + 106, + 585, + 505, + 598 + ], + "score": 1.0, + "content": "Ring-GNNs [27] and (3-WL) PPGNs [66]. For real-world tasks, Table 6 in Appendix I shows the", + "type": "text" + } + ], + "index": 42 + }, + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "results from GRL alternatives that incorporate higher-order representations in different ways, LRP [27],", + "type": "text" + } + ], + "index": 43 + }, + { + "bbox": [ + 105, + 606, + 280, + 620 + ], + "spans": [ + { + "bbox": [ + 105, + 606, + 150, + 620 + ], + "score": 1.0, + "content": "GSN [18],", + "type": "text" + }, + { + "bbox": [ + 150, + 608, + 156, + 617 + ], + "score": 0.53, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 157, + 606, + 280, + 620 + ], + "score": 1.0, + "content": "-2-LGNN [77], and SMP [98].", + "type": "text" + } + ], + "index": 44 + } + ], + "index": 40, + "bbox_fs": [ + 104, + 519, + 506, + 620 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 623, + 504, + 646 + ], + "lines": [ + { + "bbox": [ + 105, + 622, + 505, + 637 + ], + "spans": [ + { + "bbox": [ + 105, + 622, + 505, + 637 + ], + "score": 1.0, + "content": "All results are fully reproducible from the source and are available at https://github.com/", + "type": "text" + } + ], + "index": 45 + }, + { + "bbox": [ + 105, + 634, + 274, + 647 + ], + "spans": [ + { + "bbox": [ + 105, + 634, + 274, + 647 + ], + "score": 1.0, + "content": "PurdueMINDS/reconstruction-gnns.", + "type": "text" + } + ], + "index": 46 + } + ], + "index": 45.5, + "bbox_fs": [ + 105, + 622, + 505, + 647 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 650, + 205, + 662 + ], + "lines": [ + { + "bbox": [ + 106, + 649, + 207, + 663 + ], + "spans": [ + { + "bbox": [ + 106, + 649, + 207, + 663 + ], + "score": 1.0, + "content": "Results and discussion.", + "type": "text" + } + ], + "index": 47 + } + ], + "index": 47 + }, + { + "type": "text", + "bbox": [ + 107, + 667, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 106, + 667, + 505, + 679 + ], + "spans": [ + { + "bbox": [ + 106, + 667, + 505, + 679 + ], + "score": 1.0, + "content": "A1 (Graph property tasks). Table 1 confirms Theorem 2, where the increase in expressive power", + "type": "text" + } + ], + "index": 48 + }, + { + "bbox": [ + 105, + 677, + 505, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 210, + 690 + ], + "score": 1.0, + "content": "from reconstruction allows", + "type": "text" + }, + { + "bbox": [ + 211, + 678, + 217, + 688 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 218, + 677, + 505, + 690 + ], + "score": 1.0, + "content": "-Reconstruction GNNs to distinguish CSL graphs, a task that GNNs cannot", + "type": "text" + } + ], + "index": 49 + }, + { + "bbox": [ + 105, + 688, + 503, + 701 + ], + "spans": [ + { + "bbox": [ + 105, + 688, + 158, + 701 + ], + "score": 1.0, + "content": "solve. Here,", + "type": "text" + }, + { + "bbox": [ + 158, + 689, + 165, + 699 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 165, + 688, + 447, + 701 + ], + "score": 1.0, + "content": "-Reconstruction GNNs boost the accuracy of standard GNNs between", + "type": "text" + }, + { + "bbox": [ + 447, + 689, + 466, + 700 + ], + "score": 0.87, + "content": "1 0 \\times", + "type": "inline_equation" + }, + { + "bbox": [ + 466, + 688, + 484, + 701 + ], + "score": 1.0, + "content": "and", + "type": "text" + }, + { + "bbox": [ + 484, + 689, + 503, + 699 + ], + "score": 0.86, + "content": "2 0 \\times", + "type": "inline_equation" + } + ], + "index": 50 + }, + { + "bbox": [ + 106, + 700, + 505, + 712 + ], + "spans": [ + { + "bbox": [ + 106, + 700, + 342, + 712 + ], + "score": 1.0, + "content": "Theorem 2 only guarantees GNN expressiveness boosting for", + "type": "text" + }, + { + "bbox": [ + 343, + 700, + 373, + 712 + ], + "score": 0.9, + "content": "( n - 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 373, + 700, + 505, + 712 + ], + "score": 1.0, + "content": "-Reconstruction, but our empirical", + "type": "text" + } + ], + "index": 51 + }, + { + "bbox": [ + 106, + 711, + 505, + 722 + ], + "spans": [ + { + "bbox": [ + 106, + 711, + 219, + 722 + ], + "score": 1.0, + "content": "results also show benefits for", + "type": "text" + }, + { + "bbox": [ + 219, + 711, + 225, + 721 + ], + "score": 0.82, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 226, + 711, + 306, + 722 + ], + "score": 1.0, + "content": "-Reconstruction with", + "type": "text" + }, + { + "bbox": [ + 307, + 712, + 345, + 722 + ], + "score": 0.89, + "content": "k \\leq n - 2", + "type": "inline_equation" + }, + { + "bbox": [ + 345, + 711, + 505, + 722 + ], + "score": 1.0, + "content": ". Table 1 also confirms Theorem 1, where", + "type": "text" + } + ], + "index": 52 + }, + { + "bbox": [ + 106, + 465, + 505, + 477 + ], + "spans": [ + { + "bbox": [ + 106, + 466, + 113, + 475 + ], + "score": 0.71, + "content": "k", + "type": "inline_equation", + "cross_page": true + }, + { + "bbox": [ + 113, + 465, + 505, + 477 + ], + "score": 1.0, + "content": "-Reconstruction GNNs provide significant accuracy boosts on all cycle detection tasks (4 CYCLES, 6", + "type": "text", + "cross_page": true + } + ], + "index": 11 + }, + { + "bbox": [ + 106, + 476, + 506, + 488 + ], + "spans": [ + { + "bbox": [ + 106, + 476, + 506, + 488 + ], + "score": 1.0, + "content": "CYCLES and 8 CYCLES). See Appendix J.1, for a detailed discussion on results for CONNECTIVITY,", + "type": "text", + "cross_page": true + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 487, + 369, + 500 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 369, + 500 + ], + "score": 1.0, + "content": "DIAMETER, and SPECTRAL RADIUS, which also show boostings.", + "type": "text", + "cross_page": true + } + ], + "index": 13 + } + ], + "index": 50, + "bbox_fs": [ + 105, + 667, + 505, + 722 + ] + } + ] + }, + { + "preproc_blocks": [ + { + "type": "table", + "bbox": [ + 107, + 102, + 504, + 264 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 106, + 70, + 505, + 100 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 70, + 505, + 82 + ], + "spans": [ + { + "bbox": [ + 105, + 70, + 324, + 82 + ], + "score": 1.0, + "content": "Table 1: Synthetic graph property tasks. We highlight in green", + "type": "text" + }, + { + "bbox": [ + 324, + 71, + 330, + 79 + ], + "score": 0.74, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 330, + 70, + 505, + 82 + ], + "score": 1.0, + "content": "-Reconstruction GNNs boosting the original GNN", + "type": "text" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 79, + 506, + 92 + ], + "spans": [ + { + "bbox": [ + 105, + 79, + 506, + 92 + ], + "score": 1.0, + "content": "architecture. †: Std. not reported in original work. +: Laplacian embeddings used as positional features. ∗: Vertex", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 105, + 90, + 244, + 102 + ], + "spans": [ + { + "bbox": [ + 105, + 90, + 244, + 102 + ], + "score": 1.0, + "content": "identifiers used as positional features.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "table_body", + "bbox": [ + 107, + 102, + 504, + 264 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 107, + 102, + 504, + 264 + ], + "spans": [ + { + "bbox": [ + 107, + 102, + 504, + 264 + ], + "score": 0.978, + "html": "
CSL4 CYCLES6 CYCLESCONNECTIVITYMulti-taskInvariant to vertex permutations?
(Accuracy %%)↑(Accuracy % %) ↑(Accuracy %)↑8 CYCLES (Accuracy %)↑(logMSE)↓DIAMETER (logMSE)↓SPECTRAL RADIUS (logMSE)↓
(n-1)GIN (orig.)4.66 ± 4.0093.0t92.7t92.5t-3.419 ± 0.3200.588 ± 0.354-2.130 ± 1.396
88.66 ± 22.6695.17 ± 4.9197.35 ± 0.7494.69 ± 2.34-3.575 ± 0.395-0.195 ± 0.714-2.732 ± 0.793
Reeooor(n-2)78.66 ± 22.1794.06±5.1097.50±0.7295.04 ± 2.69-3.799 ± 0.187-0.207 ± 0.381-2.344 ± 0.569
(n-3)73.33 ± 16.1996.61 ± 1.4097.84 ± 1.3794.48 ± 2.13-3.779 ± 0.0640.105 ±0.225-1.908 ± 0.860<<<<
[n/2]40.66 ± 9.0475.13 ± 0.2663.28 ± 0.5963.53 ± 1.14-3.765 ± 0.0830.564 ± 0.025-2.130 ± 0.166
GCN(orig.)6.66 ± 2.1098.336 ± 0.2495.73 ± 2.7287.14 ± 12.73-3.781 ± 0.0750.087 ± 0.186-2.204 ± 0.362
(n-1)100.00 ±0.0099.00 ±0.1097.63 ± 0.1994.99 ± 2.31-4.039 ± 0.101-1.175 ± 0.425-3.625 ± 0.536
(n-2)100.00±0.0098.77 ±0.6197.89 ± 0.6997.82 ± 1.10-3.970 ± 0.059-0.577 ± 0.135-3.397 ± 0.273
Reeeoss(n-3)96.00 ±6.4699.11 ± 0.1998.31 ± 0.5297.18 ± 0.58-3.995 ± 0.031-0.333 ± 0.117-3.105 ± 0.286
[n/2]49.33 ± 7.4275.19 ± 0.1966.04 ± 0.5963.66 ± 0.51-3.693 ± 0.0630.8518 ± 0.016-1.838 ± 0.054
PNA (orig.)10.00 ± 2.9881.59 ± 19.8695.57 ± 0.3684.81 ± 16.48-3.794 ± 0.155-0.605 ± 0.097-3.610 ± 0.137
(n-1)100.00 ±0.0097.88 ± 2.1999.18 ±0.2098.92 ± 0.72-3.904 ± 0.001-0.765 ± 0.032-3.954 ±0.118
Rreeoor (n-2)95.33 ± 7.7799.12 ± 0.2899.10 ± 0.5799.22 ± 0.27-3.781 ± 0.085-0.090 ± 0.135-3.478 ± 0.206
(n-3)95.33 ± 5.8189.36 ± 0.22 75.34 ±0.1899.34 ± 0.2693.92 ± 8.15 64.01 ± 0.30-3.710 ± 0.209 -2.977 ± 0.0650.042 ± 0.047-3.311 ± 0.067√
[n/2]42.66 ± 11.0365.58 ± 0.951.445 ± 0.037-1.073 ± 0.075
Positional GIN Ring-GNN99.33+ ± 1.3388.3†96.1†95.3t-1.61t-2.17-2.66tx<ν
10.00 ± 0.0099.9†100.0†71.4二
PPGN (3-WL)97.80 ± 10.9199.8†87.1†76.5†二二
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OGBG-MOLTOX21 OGBG-MOLTOXCAST OGBG-MOLFREESOLV OGBG-MOLESOL 0GBG-MOLLIPO OGBG-MOLPCBA(ROC-AUC %)↑ (ROC-AUC %) ↑ (RSMSE)↓ (RSMSE)↓ (RSMSE)↓ (AP%)↑
GIN (orig.)74.91 ± 0.5163.41 ± 0.742.411 ± 0.123 1.111 ± 0.038 0.754 ± 0.010 21.16 ± 0.28
(n-1)75.15 ± 1.4063.95 ± 0.532.283 ± 0.2791.026 ± 0.0330.716± 0.02023.60 ± 0.02
(n-2)76.84 ± 0.6265.36 ± 0.492.117 ± 0.1811.006 ± 0.0300.736± 0.02523.25 ± 0.00
(n-3)76.78 ± 0.6464.84 ± 0.712.370 ± 0.3261.055 ± 0.0310.738 ± 0.01823.33 ± 0.09
[n/2]74.40 ± 0.7562.29 ± 0.282.531 ± 0.2061.343 ± 0.0530.842 ± 0.02013.50 ± 0.32
GCN (orig.)75.29 ± 0.6963.54 ± 0.422.417 ± 0.1781.106 ± 0.0360.793 ± 0.04020.20 ± 0.24
上(n-1)76.46 ± 0.7764.51 ± 0.602.524 ± 0.3001.096 ± 0.0450.760 ± 0.01521.25 ± 0.25
(n-2)75.58 ± 0.9964.38 ± 0.392.467 ± 0.2311.086 ± 0.0480.766 ± 0.02520.10 ± 0.08
(n-3)75.88 ± 0.7364.70 ±0.812.345 ± 0.2611.114 ± 0.0470.754 ± 0.02119.04 ± 0.03
[n/2]74.03 ± 0.6362.80 ± 0.772.599 ± 0.1611.372 ± 0.0480.835± 0.02011.69 ± 1.41
PNA (orig.)74.28 ± 0.5262.69 ± 0.632.192 ± 0.1251.140 ± 0.0320.759 ± 0.01725.45 ± 0.04
(n-1)73.64 ± 0.7464.14 ±0.762.341 ± 0.0701.723 ± 0.1450.743 ± 0.01523.11 ± 0.05
(n-2)74.89 ± 0.2965.22 ± 0.472.298 ± 0.1151.392 ± 0.2720.794 ± 0.06522.10±0.03
(n-3)75.10 ± 0.7365.03 ± 0.582.133 ± 0.0861.360 ± 0.1630.785 ± 0.04120.05 ± 0.15
[n/2]73.71 ± 0.6161.25 ± 0.492.185 ± 0.2311.157 ± 0.0560.843 ± 0.01812.33 ± 1.20
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See Appendix J.1, for a detailed discussion on results for CONNECTIVITY,", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 105, + 487, + 369, + 500 + ], + "spans": [ + { + "bbox": [ + 105, + 487, + 369, + 500 + ], + "score": 1.0, + "content": "DIAMETER, and SPECTRAL RADIUS, which also show boostings.", + "type": "text" + } + ], + "index": 13 + } + ], + "index": 12 + }, + { + "type": "text", + "bbox": [ + 106, + 498, + 505, + 651 + ], + "lines": [ + { + "bbox": [ + 105, + 497, + 506, + 510 + ], + "spans": [ + { + "bbox": [ + 105, + 497, + 436, + 510 + ], + "score": 1.0, + "content": "A2 (Real-world tasks). Table 2 and Table 6 in Appendix I show that applying", + "type": "text" + }, + { + "bbox": [ + 437, + 498, + 443, + 508 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 497, + 506, + 510 + ], + "score": 1.0, + "content": "-reconstruction", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 509, + 505, + 520 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 505, + 520 + ], + "score": 1.0, + "content": "to GNNs significantly boosts their performance across all eight real-world tasks. In particular, in", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 520, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 236, + 532 + ], + "score": 1.0, + "content": "Table 2, we see a boost of up to", + "type": "text" + }, + { + "bbox": [ + 236, + 520, + 251, + 530 + ], + "score": 0.87, + "content": "5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 520, + 505, + 532 + ], + "score": 1.0, + "content": "while achieving the best results in five out of six datasets. The", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 106, + 531, + 505, + 543 + ], + "spans": [ + { + "bbox": [ + 106, + 531, + 138, + 543 + ], + "score": 0.92, + "content": "( n - 2 )", + "type": "inline_equation" + }, + { + "bbox": [ + 138, + 531, + 505, + 543 + ], + "score": 1.0, + "content": "-reconstruction applied to GIN gives the best results in the OGBG tasks, with the exception", + "type": "text" + } + ], + "index": 17 + }, + { + "bbox": [ + 105, + 541, + 505, + 554 + ], + "spans": [ + { + "bbox": [ + 105, + 541, + 305, + 554 + ], + "score": 1.0, + "content": "of OGBG-MOLLIPO and OGBG-MOLPCBA where", + "type": "text" + }, + { + "bbox": [ + 306, + 542, + 337, + 554 + ], + "score": 0.92, + "content": "( n - 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 338, + 541, + 505, + 554 + ], + "score": 1.0, + "content": "-reconstruction performs better. The only", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 552, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 506, + 565 + ], + "score": 1.0, + "content": "settings where we did not get any boost were PNA for OGBG-MOLESOL and OGBG-MOLPCBA. Table 6", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 563, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 563, + 400, + 576 + ], + "score": 1.0, + "content": "in Appendix I also shows consistent boost in GNNs’ performance of up to", + "type": "text" + }, + { + "bbox": [ + 401, + 564, + 420, + 574 + ], + "score": 0.88, + "content": "2 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 563, + 506, + 576 + ], + "score": 1.0, + "content": "in other datasets. On", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 574, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 132, + 587 + ], + "score": 1.0, + "content": "ZINC,", + "type": "text" + }, + { + "bbox": [ + 132, + 575, + 139, + 585 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 139, + 574, + 457, + 587 + ], + "score": 1.0, + "content": "-Reconstruction yields better results than the higher-order alternatives LRP and", + "type": "text" + }, + { + "bbox": [ + 458, + 574, + 464, + 584 + ], + "score": 0.42, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 574, + 506, + 587 + ], + "score": 1.0, + "content": "-2-LGNN.", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 584, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 584, + 506, + 598 + ], + "score": 1.0, + "content": "While GSN gives the best ZINC results, we note that GSN requires application-specific features. In", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 172, + 609 + ], + "score": 1.0, + "content": "OGBG-MOLHIV,", + "type": "text" + }, + { + "bbox": [ + 172, + 597, + 179, + 606 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "-reconstruction is able to boost both GIN and GCN. The results in Appendix G show", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 606, + 506, + 619 + ], + "spans": [ + { + "bbox": [ + 105, + 606, + 151, + 619 + ], + "score": 1.0, + "content": "that nearly", + "type": "text" + }, + { + "bbox": [ + 151, + 607, + 176, + 618 + ], + "score": 0.9, + "content": "1 0 0 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 606, + 506, + 619 + ], + "score": 1.0, + "content": "of the graphs in our real-world datasets are distinguishable by the 1-WL algorithm,", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 618, + 506, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 618, + 506, + 631 + ], + "score": 1.0, + "content": "thus we can conclude that traditional GNNs are expressive enough for all our real-world tasks. Hence,", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 630, + 506, + 641 + ], + "spans": [ + { + "bbox": [ + 106, + 630, + 506, + 641 + ], + "score": 1.0, + "content": "real-world boosts of reconstruction over GNNs can be attributed to the gains from invariances to vertex", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 640, + 447, + 652 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 447, + 652 + ], + "score": 1.0, + "content": "removals (cf. Section 4.2) rather than the boost in expressive power (cf. Section 4.1).", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 20.5 + }, + { + "type": "text", + "bbox": [ + 107, + 656, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 105, + 655, + 506, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 378, + 668 + ], + "score": 1.0, + "content": "A3 (Subgraph sizes). Overall we observe that removing one vertex", + "type": "text" + }, + { + "bbox": [ + 379, + 657, + 417, + 667 + ], + "score": 0.87, + "content": "k = n - 1 )", + "type": "inline_equation" + }, + { + "bbox": [ + 417, + 655, + 506, + 668 + ], + "score": 1.0, + "content": ") is enough to improve", + "type": "text" + } + ], + "index": 28 + }, + { + "bbox": [ + 105, + 667, + 506, + 680 + ], + "spans": [ + { + "bbox": [ + 105, + 667, + 461, + 680 + ], + "score": 1.0, + "content": "the performance of GNNs in most experiments. At the other extreme end of vertex removals,", + "type": "text" + }, + { + "bbox": [ + 461, + 667, + 502, + 679 + ], + "score": 0.93, + "content": "k = \\lceil n / 2 \\rceil", + "type": "inline_equation" + }, + { + "bbox": [ + 502, + 667, + 506, + 680 + ], + "score": 1.0, + "content": ",", + "type": "text" + } + ], + "index": 29 + }, + { + "bbox": [ + 105, + 677, + 507, + 690 + ], + "spans": [ + { + "bbox": [ + 105, + 677, + 507, + 690 + ], + "score": 1.0, + "content": "there is a significant loss in expressiveness compared to the original GNN. In most real-world tasks,", + "type": "text" + } + ], + "index": 30 + }, + { + "bbox": [ + 105, + 687, + 503, + 702 + ], + "spans": [ + { + "bbox": [ + 105, + 687, + 430, + 702 + ], + "score": 1.0, + "content": "Table 2 and Table 6 in Appendix I show a variety of performance boosts also with", + "type": "text" + }, + { + "bbox": [ + 430, + 689, + 503, + 701 + ], + "score": 0.92, + "content": "k \\in \\{ n { - } 2 , n { - } 3 \\}", + "type": "inline_equation" + } + ], + "index": 31 + }, + { + "bbox": [ + 105, + 699, + 507, + 712 + ], + "spans": [ + { + "bbox": [ + 105, + 699, + 359, + 712 + ], + "score": 1.0, + "content": "For GCN and PNA in OGBG-MOLESOL, specifically, we only see", + "type": "text" + }, + { + "bbox": [ + 360, + 700, + 366, + 710 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 366, + 699, + 507, + 712 + ], + "score": 1.0, + "content": "-Reconstruction boosts over smaller", + "type": "text" + } + ], + "index": 32 + }, + { + "bbox": [ + 105, + 711, + 506, + 723 + ], + "spans": [ + { + "bbox": [ + 105, + 711, + 177, + 723 + ], + "score": 1.0, + "content": "subgraphs such as", + "type": "text" + }, + { + "bbox": [ + 177, + 711, + 199, + 721 + ], + "score": 0.86, + "content": "n - 3", + "type": "inline_equation" + }, + { + "bbox": [ + 200, + 711, + 506, + 723 + ], + "score": 1.0, + "content": ", which might be due to the task’s need of more invariance to vertex removals (cf.", + "type": "text" + } + ], + "index": 33 + } + ], + "index": 30.5 + } + ], + "page_idx": 8, + "page_size": [ + 612, + 792 + ], + "discarded_blocks": [ + { + "type": "discarded", + "bbox": [ + 302, + 741, + 308, + 750 + ], + "lines": [ + { + "bbox": [ + 302, + 741, + 309, + 752 + ], + "spans": [ + { + "bbox": [ + 302, + 741, + 309, + 752 + ], + "score": 1.0, + "content": "9", + "type": "text" + } + ] + } + ] + } + ], + "para_blocks": [ + { + "type": "table", + "bbox": [ + 107, + 102, + 504, + 264 + ], + "blocks": [ + { + "type": "table_caption", + "bbox": [ + 106, + 70, + 505, + 100 + ], + "group_id": 0, + "lines": [ + { + "bbox": [ + 105, + 70, + 505, + 82 + ], + "spans": [ + { + "bbox": [ + 105, + 70, + 324, + 82 + ], + "score": 1.0, + "content": "Table 1: Synthetic graph property tasks. 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CSL4 CYCLES6 CYCLESCONNECTIVITYMulti-taskInvariant to vertex permutations?
(Accuracy %%)↑(Accuracy % %) ↑(Accuracy %)↑8 CYCLES (Accuracy %)↑(logMSE)↓DIAMETER (logMSE)↓SPECTRAL RADIUS (logMSE)↓
(n-1)GIN (orig.)4.66 ± 4.0093.0t92.7t92.5t-3.419 ± 0.3200.588 ± 0.354-2.130 ± 1.396
88.66 ± 22.6695.17 ± 4.9197.35 ± 0.7494.69 ± 2.34-3.575 ± 0.395-0.195 ± 0.714-2.732 ± 0.793
Reeooor(n-2)78.66 ± 22.1794.06±5.1097.50±0.7295.04 ± 2.69-3.799 ± 0.187-0.207 ± 0.381-2.344 ± 0.569
(n-3)73.33 ± 16.1996.61 ± 1.4097.84 ± 1.3794.48 ± 2.13-3.779 ± 0.0640.105 ±0.225-1.908 ± 0.860<<<<
[n/2]40.66 ± 9.0475.13 ± 0.2663.28 ± 0.5963.53 ± 1.14-3.765 ± 0.0830.564 ± 0.025-2.130 ± 0.166
GCN(orig.)6.66 ± 2.1098.336 ± 0.2495.73 ± 2.7287.14 ± 12.73-3.781 ± 0.0750.087 ± 0.186-2.204 ± 0.362
(n-1)100.00 ±0.0099.00 ±0.1097.63 ± 0.1994.99 ± 2.31-4.039 ± 0.101-1.175 ± 0.425-3.625 ± 0.536
(n-2)100.00±0.0098.77 ±0.6197.89 ± 0.6997.82 ± 1.10-3.970 ± 0.059-0.577 ± 0.135-3.397 ± 0.273
Reeeoss(n-3)96.00 ±6.4699.11 ± 0.1998.31 ± 0.5297.18 ± 0.58-3.995 ± 0.031-0.333 ± 0.117-3.105 ± 0.286
[n/2]49.33 ± 7.4275.19 ± 0.1966.04 ± 0.5963.66 ± 0.51-3.693 ± 0.0630.8518 ± 0.016-1.838 ± 0.054
PNA (orig.)10.00 ± 2.9881.59 ± 19.8695.57 ± 0.3684.81 ± 16.48-3.794 ± 0.155-0.605 ± 0.097-3.610 ± 0.137
(n-1)100.00 ±0.0097.88 ± 2.1999.18 ±0.2098.92 ± 0.72-3.904 ± 0.001-0.765 ± 0.032-3.954 ±0.118
Rreeoor (n-2)95.33 ± 7.7799.12 ± 0.2899.10 ± 0.5799.22 ± 0.27-3.781 ± 0.085-0.090 ± 0.135-3.478 ± 0.206
(n-3)95.33 ± 5.8189.36 ± 0.22 75.34 ±0.1899.34 ± 0.2693.92 ± 8.15 64.01 ± 0.30-3.710 ± 0.209 -2.977 ± 0.0650.042 ± 0.047-3.311 ± 0.067√
[n/2]42.66 ± 11.0365.58 ± 0.951.445 ± 0.037-1.073 ± 0.075
Positional GIN Ring-GNN99.33+ ± 1.3388.3†96.1†95.3t-1.61t-2.17-2.66tx<ν
10.00 ± 0.0099.9†100.0†71.4二
PPGN (3-WL)97.80 ± 10.9199.8†87.1†76.5†二二
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OGBG-MOLTOX21 OGBG-MOLTOXCAST OGBG-MOLFREESOLV OGBG-MOLESOL 0GBG-MOLLIPO OGBG-MOLPCBA(ROC-AUC %)↑ (ROC-AUC %) ↑ (RSMSE)↓ (RSMSE)↓ (RSMSE)↓ (AP%)↑
GIN (orig.)74.91 ± 0.5163.41 ± 0.742.411 ± 0.123 1.111 ± 0.038 0.754 ± 0.010 21.16 ± 0.28
(n-1)75.15 ± 1.4063.95 ± 0.532.283 ± 0.2791.026 ± 0.0330.716± 0.02023.60 ± 0.02
(n-2)76.84 ± 0.6265.36 ± 0.492.117 ± 0.1811.006 ± 0.0300.736± 0.02523.25 ± 0.00
(n-3)76.78 ± 0.6464.84 ± 0.712.370 ± 0.3261.055 ± 0.0310.738 ± 0.01823.33 ± 0.09
[n/2]74.40 ± 0.7562.29 ± 0.282.531 ± 0.2061.343 ± 0.0530.842 ± 0.02013.50 ± 0.32
GCN (orig.)75.29 ± 0.6963.54 ± 0.422.417 ± 0.1781.106 ± 0.0360.793 ± 0.04020.20 ± 0.24
上(n-1)76.46 ± 0.7764.51 ± 0.602.524 ± 0.3001.096 ± 0.0450.760 ± 0.01521.25 ± 0.25
(n-2)75.58 ± 0.9964.38 ± 0.392.467 ± 0.2311.086 ± 0.0480.766 ± 0.02520.10 ± 0.08
(n-3)75.88 ± 0.7364.70 ±0.812.345 ± 0.2611.114 ± 0.0470.754 ± 0.02119.04 ± 0.03
[n/2]74.03 ± 0.6362.80 ± 0.772.599 ± 0.1611.372 ± 0.0480.835± 0.02011.69 ± 1.41
PNA (orig.)74.28 ± 0.5262.69 ± 0.632.192 ± 0.1251.140 ± 0.0320.759 ± 0.01725.45 ± 0.04
(n-1)73.64 ± 0.7464.14 ±0.762.341 ± 0.0701.723 ± 0.1450.743 ± 0.01523.11 ± 0.05
(n-2)74.89 ± 0.2965.22 ± 0.472.298 ± 0.1151.392 ± 0.2720.794 ± 0.06522.10±0.03
(n-3)75.10 ± 0.7365.03 ± 0.582.133 ± 0.0861.360 ± 0.1630.785 ± 0.04120.05 ± 0.15
[n/2]73.71 ± 0.6161.25 ± 0.492.185 ± 0.2311.157 ± 0.0560.843 ± 0.01812.33 ± 1.20
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Table 2 and Table 6 in Appendix I show that applying", + "type": "text" + }, + { + "bbox": [ + 437, + 498, + 443, + 508 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 444, + 497, + 506, + 510 + ], + "score": 1.0, + "content": "-reconstruction", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 509, + 505, + 520 + ], + "spans": [ + { + "bbox": [ + 105, + 509, + 505, + 520 + ], + "score": 1.0, + "content": "to GNNs significantly boosts their performance across all eight real-world tasks. In particular, in", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 520, + 505, + 532 + ], + "spans": [ + { + "bbox": [ + 105, + 520, + 236, + 532 + ], + "score": 1.0, + "content": "Table 2, we see a boost of up to", + "type": "text" + }, + { + "bbox": [ + 236, + 520, + 251, + 530 + ], + "score": 0.87, + "content": "5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 251, + 520, + 505, + 532 + ], + "score": 1.0, + "content": "while achieving the best results in five out of six datasets. 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The only", + "type": "text" + } + ], + "index": 18 + }, + { + "bbox": [ + 105, + 552, + 506, + 565 + ], + "spans": [ + { + "bbox": [ + 105, + 552, + 506, + 565 + ], + "score": 1.0, + "content": "settings where we did not get any boost were PNA for OGBG-MOLESOL and OGBG-MOLPCBA. Table 6", + "type": "text" + } + ], + "index": 19 + }, + { + "bbox": [ + 105, + 563, + 506, + 576 + ], + "spans": [ + { + "bbox": [ + 105, + 563, + 400, + 576 + ], + "score": 1.0, + "content": "in Appendix I also shows consistent boost in GNNs’ performance of up to", + "type": "text" + }, + { + "bbox": [ + 401, + 564, + 420, + 574 + ], + "score": 0.88, + "content": "2 5 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 420, + 563, + 506, + 576 + ], + "score": 1.0, + "content": "in other datasets. On", + "type": "text" + } + ], + "index": 20 + }, + { + "bbox": [ + 105, + 574, + 506, + 587 + ], + "spans": [ + { + "bbox": [ + 105, + 574, + 132, + 587 + ], + "score": 1.0, + "content": "ZINC,", + "type": "text" + }, + { + "bbox": [ + 132, + 575, + 139, + 585 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 139, + 574, + 457, + 587 + ], + "score": 1.0, + "content": "-Reconstruction yields better results than the higher-order alternatives LRP and", + "type": "text" + }, + { + "bbox": [ + 458, + 574, + 464, + 584 + ], + "score": 0.42, + "content": "\\delta", + "type": "inline_equation" + }, + { + "bbox": [ + 464, + 574, + 506, + 587 + ], + "score": 1.0, + "content": "-2-LGNN.", + "type": "text" + } + ], + "index": 21 + }, + { + "bbox": [ + 105, + 584, + 506, + 598 + ], + "spans": [ + { + "bbox": [ + 105, + 584, + 506, + 598 + ], + "score": 1.0, + "content": "While GSN gives the best ZINC results, we note that GSN requires application-specific features. In", + "type": "text" + } + ], + "index": 22 + }, + { + "bbox": [ + 105, + 596, + 506, + 609 + ], + "spans": [ + { + "bbox": [ + 105, + 596, + 172, + 609 + ], + "score": 1.0, + "content": "OGBG-MOLHIV,", + "type": "text" + }, + { + "bbox": [ + 172, + 597, + 179, + 606 + ], + "score": 0.79, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 179, + 596, + 506, + 609 + ], + "score": 1.0, + "content": "-reconstruction is able to boost both GIN and GCN. The results in Appendix G show", + "type": "text" + } + ], + "index": 23 + }, + { + "bbox": [ + 105, + 606, + 506, + 619 + ], + "spans": [ + { + "bbox": [ + 105, + 606, + 151, + 619 + ], + "score": 1.0, + "content": "that nearly", + "type": "text" + }, + { + "bbox": [ + 151, + 607, + 176, + 618 + ], + "score": 0.9, + "content": "1 0 0 \\%", + "type": "inline_equation" + }, + { + "bbox": [ + 176, + 606, + 506, + 619 + ], + "score": 1.0, + "content": "of the graphs in our real-world datasets are distinguishable by the 1-WL algorithm,", + "type": "text" + } + ], + "index": 24 + }, + { + "bbox": [ + 105, + 618, + 506, + 631 + ], + "spans": [ + { + "bbox": [ + 105, + 618, + 506, + 631 + ], + "score": 1.0, + "content": "thus we can conclude that traditional GNNs are expressive enough for all our real-world tasks. Hence,", + "type": "text" + } + ], + "index": 25 + }, + { + "bbox": [ + 106, + 630, + 506, + 641 + ], + "spans": [ + { + "bbox": [ + 106, + 630, + 506, + 641 + ], + "score": 1.0, + "content": "real-world boosts of reconstruction over GNNs can be attributed to the gains from invariances to vertex", + "type": "text" + } + ], + "index": 26 + }, + { + "bbox": [ + 105, + 640, + 447, + 652 + ], + "spans": [ + { + "bbox": [ + 105, + 640, + 447, + 652 + ], + "score": 1.0, + "content": "removals (cf. Section 4.2) rather than the boost in expressive power (cf. Section 4.1).", + "type": "text" + } + ], + "index": 27 + } + ], + "index": 20.5, + "bbox_fs": [ + 105, + 497, + 506, + 652 + ] + }, + { + "type": "text", + "bbox": [ + 107, + 656, + 505, + 722 + ], + "lines": [ + { + "bbox": [ + 105, + 655, + 506, + 668 + ], + "spans": [ + { + "bbox": [ + 105, + 655, + 378, + 668 + ], + "score": 1.0, + "content": "A3 (Subgraph sizes). 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In the graph property tasks (Table 1), we see significant boosts also for", + "type": "text" + }, + { + "bbox": [ + 431, + 73, + 504, + 85 + ], + "score": 0.91, + "content": "k \\in \\{ n { - } 2 , n { - } 3 \\}", + "type": "inline_equation" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 83, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 83, + 505, + 95 + ], + "score": 1.0, + "content": "in all models across most tasks, except PNA. However, as in real-world tasks the extreme case of small", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 94, + 495, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 149, + 106 + ], + "score": 1.0, + "content": "subgraphs", + "type": "text" + }, + { + "bbox": [ + 150, + 94, + 194, + 106 + ], + "score": 0.93, + "content": "k = \\lceil n / 2 \\rceil", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 94, + 393, + 106 + ], + "score": 1.0, + "content": "significantly harms the ability to solve tasks with", + "type": "text" + }, + { + "bbox": [ + 393, + 95, + 399, + 104 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 94, + 495, + 106 + ], + "score": 1.0, + "content": "-Reconstruction GNNs.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1 + }, + { + "type": "title", + "bbox": [ + 107, + 111, + 188, + 124 + ], + "lines": [ + { + "bbox": [ + 104, + 109, + 190, + 127 + ], + "spans": [ + { + "bbox": [ + 104, + 109, + 190, + 127 + ], + "score": 1.0, + "content": "6 Conclusions", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 3 + }, + { + "type": "text", + "bbox": [ + 107, + 131, + 505, + 208 + ], + "lines": [ + { + "bbox": [ + 106, + 131, + 505, + 144 + ], + "spans": [ + { + "bbox": [ + 106, + 131, + 212, + 144 + ], + "score": 1.0, + "content": "Our work connected graph", + "type": "text" + }, + { + "bbox": [ + 213, + 132, + 228, + 142 + ], + "score": 0.31, + "content": "( k - )", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 131, + 505, + 144 + ], + "score": 1.0, + "content": "reconstruction and modern GRL. We first showed how such connection", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 142, + 505, + 154 + ], + "spans": [ + { + "bbox": [ + 105, + 142, + 505, + 154 + ], + "score": 1.0, + "content": "results in two natural expressive graph representation classes. To make our models practical, we", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 153, + 506, + 165 + ], + "spans": [ + { + "bbox": [ + 105, + 153, + 384, + 165 + ], + "score": 1.0, + "content": "combined insights from graph reconstruction and GNNs, resulting in", + "type": "text" + }, + { + "bbox": [ + 384, + 153, + 391, + 163 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 153, + 506, + 165 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. Our", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 164, + 506, + 176 + ], + "spans": [ + { + "bbox": [ + 105, + 164, + 506, + 176 + ], + "score": 1.0, + "content": "theory shows that reconstruction boosts the expressiveness of GNNs and has a lower-variance risk", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 175, + 505, + 187 + ], + "spans": [ + { + "bbox": [ + 105, + 175, + 505, + 187 + ], + "score": 1.0, + "content": "estimator in distributions invariant to vertex removals. Empirically, we showed how the theoretical gains", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 185, + 505, + 199 + ], + "spans": [ + { + "bbox": [ + 105, + 185, + 117, + 199 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 186, + 124, + 195 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 185, + 505, + 199 + ], + "score": 1.0, + "content": "-Reconstruction GNNs translate into practice, solving graph property tasks not originally solvable", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 197, + 356, + 209 + ], + "spans": [ + { + "bbox": [ + 105, + 197, + 356, + 209 + ], + "score": 1.0, + "content": "by GNNs and boosting their performance on real-world tasks.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 7 + }, + { + "type": "title", + "bbox": [ + 108, + 223, + 207, + 237 + ], + "lines": [ + { + "bbox": [ + 105, + 222, + 208, + 240 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 208, + 240 + ], + "score": 1.0, + "content": "Acknowledgements", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 248, + 505, + 314 + ], + "lines": [ + { + "bbox": [ + 106, + 248, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 106, + 248, + 506, + 261 + ], + "score": 1.0, + "content": "This work was funded in part by the National Science Foundation (NSF) awards CAREER IIS-1943364", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 258, + 505, + 271 + ], + "spans": [ + { + "bbox": [ + 106, + 258, + 505, + 271 + ], + "score": 1.0, + "content": "and CCF-1918483. Any opinions, findings and conclusions or recommendations expressed in this", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 270, + 506, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 270, + 506, + 282 + ], + "score": 1.0, + "content": "material are those of the authors and do not necessarily reflect the views of the sponsors. Christopher", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "score": 1.0, + "content": "Morris is funded by the German Academic Exchange Service (DAAD) through a DAAD IFI postdoctoral", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 291, + 505, + 305 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 505, + 305 + ], + "score": 1.0, + "content": "scholarship (57515245). We want to thank our reviewers, who gave excellent suggestions to improve", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 300, + 149, + 317 + ], + "spans": [ + { + "bbox": [ + 104, + 300, + 149, + 317 + ], + "score": 1.0, + "content": "the paper.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 14.5 + }, + { + "type": "title", + "bbox": [ + 107, + 329, + 163, + 342 + ], + "lines": [ + { + "bbox": [ + 106, + 328, + 165, + 343 + ], + "spans": [ + { + "bbox": [ + 106, + 328, + 165, + 343 + ], + "score": 1.0, + "content": "References", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "text", + "bbox": [ + 105, + 340, + 507, + 723 + ], + "lines": [ + { + "bbox": [ + 106, + 346, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 346, + 505, + 358 + ], + "score": 1.0, + "content": "[1] Abboud, R., Ceylan, ˙I. ˙I., Grohe, M., and Lukasiewicz, T. (2020). 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In the graph property tasks (Table 1), we see significant boosts also for", + "type": "text" + }, + { + "bbox": [ + 431, + 73, + 504, + 85 + ], + "score": 0.91, + "content": "k \\in \\{ n { - } 2 , n { - } 3 \\}", + "type": "inline_equation" + } + ], + "index": 0 + }, + { + "bbox": [ + 105, + 83, + 505, + 95 + ], + "spans": [ + { + "bbox": [ + 105, + 83, + 505, + 95 + ], + "score": 1.0, + "content": "in all models across most tasks, except PNA. However, as in real-world tasks the extreme case of small", + "type": "text" + } + ], + "index": 1 + }, + { + "bbox": [ + 106, + 94, + 495, + 106 + ], + "spans": [ + { + "bbox": [ + 106, + 94, + 149, + 106 + ], + "score": 1.0, + "content": "subgraphs", + "type": "text" + }, + { + "bbox": [ + 150, + 94, + 194, + 106 + ], + "score": 0.93, + "content": "k = \\lceil n / 2 \\rceil", + "type": "inline_equation" + }, + { + "bbox": [ + 194, + 94, + 393, + 106 + ], + "score": 1.0, + "content": "significantly harms the ability to solve tasks with", + "type": "text" + }, + { + "bbox": [ + 393, + 95, + 399, + 104 + ], + "score": 0.81, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 400, + 94, + 495, + 106 + ], + "score": 1.0, + "content": "-Reconstruction GNNs.", + "type": "text" + } + ], + "index": 2 + } + ], + "index": 1, + "bbox_fs": [ + 105, + 73, + 505, + 106 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 111, + 188, + 124 + ], + "lines": [ + { + "bbox": [ + 104, + 109, + 190, + 127 + ], + "spans": [ + { + "bbox": [ + 104, + 109, + 190, + 127 + ], + "score": 1.0, + "content": "6 Conclusions", + "type": "text" + } + ], + "index": 3 + } + ], + "index": 3 + }, + { + "type": "text", + "bbox": [ + 107, + 131, + 505, + 208 + ], + "lines": [ + { + "bbox": [ + 106, + 131, + 505, + 144 + ], + "spans": [ + { + "bbox": [ + 106, + 131, + 212, + 144 + ], + "score": 1.0, + "content": "Our work connected graph", + "type": "text" + }, + { + "bbox": [ + 213, + 132, + 228, + 142 + ], + "score": 0.31, + "content": "( k - )", + "type": "inline_equation" + }, + { + "bbox": [ + 228, + 131, + 505, + 144 + ], + "score": 1.0, + "content": "reconstruction and modern GRL. We first showed how such connection", + "type": "text" + } + ], + "index": 4 + }, + { + "bbox": [ + 105, + 142, + 505, + 154 + ], + "spans": [ + { + "bbox": [ + 105, + 142, + 505, + 154 + ], + "score": 1.0, + "content": "results in two natural expressive graph representation classes. To make our models practical, we", + "type": "text" + } + ], + "index": 5 + }, + { + "bbox": [ + 105, + 153, + 506, + 165 + ], + "spans": [ + { + "bbox": [ + 105, + 153, + 384, + 165 + ], + "score": 1.0, + "content": "combined insights from graph reconstruction and GNNs, resulting in", + "type": "text" + }, + { + "bbox": [ + 384, + 153, + 391, + 163 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 391, + 153, + 506, + 165 + ], + "score": 1.0, + "content": "-Reconstruction GNNs. Our", + "type": "text" + } + ], + "index": 6 + }, + { + "bbox": [ + 105, + 164, + 506, + 176 + ], + "spans": [ + { + "bbox": [ + 105, + 164, + 506, + 176 + ], + "score": 1.0, + "content": "theory shows that reconstruction boosts the expressiveness of GNNs and has a lower-variance risk", + "type": "text" + } + ], + "index": 7 + }, + { + "bbox": [ + 105, + 175, + 505, + 187 + ], + "spans": [ + { + "bbox": [ + 105, + 175, + 505, + 187 + ], + "score": 1.0, + "content": "estimator in distributions invariant to vertex removals. Empirically, we showed how the theoretical gains", + "type": "text" + } + ], + "index": 8 + }, + { + "bbox": [ + 105, + 185, + 505, + 199 + ], + "spans": [ + { + "bbox": [ + 105, + 185, + 117, + 199 + ], + "score": 1.0, + "content": "of", + "type": "text" + }, + { + "bbox": [ + 117, + 186, + 124, + 195 + ], + "score": 0.8, + "content": "k", + "type": "inline_equation" + }, + { + "bbox": [ + 124, + 185, + 505, + 199 + ], + "score": 1.0, + "content": "-Reconstruction GNNs translate into practice, solving graph property tasks not originally solvable", + "type": "text" + } + ], + "index": 9 + }, + { + "bbox": [ + 105, + 197, + 356, + 209 + ], + "spans": [ + { + "bbox": [ + 105, + 197, + 356, + 209 + ], + "score": 1.0, + "content": "by GNNs and boosting their performance on real-world tasks.", + "type": "text" + } + ], + "index": 10 + } + ], + "index": 7, + "bbox_fs": [ + 105, + 131, + 506, + 209 + ] + }, + { + "type": "title", + "bbox": [ + 108, + 223, + 207, + 237 + ], + "lines": [ + { + "bbox": [ + 105, + 222, + 208, + 240 + ], + "spans": [ + { + "bbox": [ + 105, + 222, + 208, + 240 + ], + "score": 1.0, + "content": "Acknowledgements", + "type": "text" + } + ], + "index": 11 + } + ], + "index": 11 + }, + { + "type": "text", + "bbox": [ + 106, + 248, + 505, + 314 + ], + "lines": [ + { + "bbox": [ + 106, + 248, + 506, + 261 + ], + "spans": [ + { + "bbox": [ + 106, + 248, + 506, + 261 + ], + "score": 1.0, + "content": "This work was funded in part by the National Science Foundation (NSF) awards CAREER IIS-1943364", + "type": "text" + } + ], + "index": 12 + }, + { + "bbox": [ + 106, + 258, + 505, + 271 + ], + "spans": [ + { + "bbox": [ + 106, + 258, + 505, + 271 + ], + "score": 1.0, + "content": "and CCF-1918483. Any opinions, findings and conclusions or recommendations expressed in this", + "type": "text" + } + ], + "index": 13 + }, + { + "bbox": [ + 105, + 270, + 506, + 282 + ], + "spans": [ + { + "bbox": [ + 105, + 270, + 506, + 282 + ], + "score": 1.0, + "content": "material are those of the authors and do not necessarily reflect the views of the sponsors. Christopher", + "type": "text" + } + ], + "index": 14 + }, + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "spans": [ + { + "bbox": [ + 105, + 281, + 506, + 293 + ], + "score": 1.0, + "content": "Morris is funded by the German Academic Exchange Service (DAAD) through a DAAD IFI postdoctoral", + "type": "text" + } + ], + "index": 15 + }, + { + "bbox": [ + 105, + 291, + 505, + 305 + ], + "spans": [ + { + "bbox": [ + 105, + 291, + 505, + 305 + ], + "score": 1.0, + "content": "scholarship (57515245). We want to thank our reviewers, who gave excellent suggestions to improve", + "type": "text" + } + ], + "index": 16 + }, + { + "bbox": [ + 104, + 300, + 149, + 317 + ], + "spans": [ + { + "bbox": [ + 104, + 300, + 149, + 317 + ], + "score": 1.0, + "content": "the paper.", + "type": "text" + } + ], + "index": 17 + } + ], + "index": 14.5, + "bbox_fs": [ + 104, + 248, + 506, + 317 + ] + }, + { + "type": "title", + "bbox": [ + 107, + 329, + 163, + 342 + ], + "lines": [ + { + "bbox": [ + 106, + 328, + 165, + 343 + ], + "spans": [ + { + "bbox": [ + 106, + 328, + 165, + 343 + ], + "score": 1.0, + "content": "References", + "type": "text" + } + ], + "index": 18 + } + ], + "index": 18 + }, + { + "type": "list", + "bbox": [ + 105, + 340, + 507, + 723 + ], + "lines": [ + { + "bbox": [ + 106, + 346, + 505, + 358 + ], + "spans": [ + { + "bbox": [ + 106, + 346, + 505, + 358 + ], + "score": 1.0, + "content": "[1] Abboud, R., Ceylan, ˙I. ˙I., Grohe, M., and Lukasiewicz, T. (2020). 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OGBG-MOLTOX21 OGBG-MOLTOXCAST OGBG-MOLFREESOLV OGBG-MOLESOL 0GBG-MOLLIPO OGBG-MOLPCBA(ROC-AUC %)↑ (ROC-AUC %) ↑ (RSMSE)↓ (RSMSE)↓ (RSMSE)↓ (AP%)↑
GIN (orig.)74.91 ± 0.5163.41 ± 0.742.411 ± 0.123 1.111 ± 0.038 0.754 ± 0.010 21.16 ± 0.28
(n-1)75.15 ± 1.4063.95 ± 0.532.283 ± 0.2791.026 ± 0.0330.716± 0.02023.60 ± 0.02
(n-2)76.84 ± 0.6265.36 ± 0.492.117 ± 0.1811.006 ± 0.0300.736± 0.02523.25 ± 0.00
(n-3)76.78 ± 0.6464.84 ± 0.712.370 ± 0.3261.055 ± 0.0310.738 ± 0.01823.33 ± 0.09
[n/2]74.40 ± 0.7562.29 ± 0.282.531 ± 0.2061.343 ± 0.0530.842 ± 0.02013.50 ± 0.32
GCN (orig.)75.29 ± 0.6963.54 ± 0.422.417 ± 0.1781.106 ± 0.0360.793 ± 0.04020.20 ± 0.24
上(n-1)76.46 ± 0.7764.51 ± 0.602.524 ± 0.3001.096 ± 0.0450.760 ± 0.01521.25 ± 0.25
(n-2)75.58 ± 0.9964.38 ± 0.392.467 ± 0.2311.086 ± 0.0480.766 ± 0.02520.10 ± 0.08
(n-3)75.88 ± 0.7364.70 ±0.812.345 ± 0.2611.114 ± 0.0470.754 ± 0.02119.04 ± 0.03
[n/2]74.03 ± 0.6362.80 ± 0.772.599 ± 0.1611.372 ± 0.0480.835± 0.02011.69 ± 1.41
PNA (orig.)74.28 ± 0.5262.69 ± 0.632.192 ± 0.1251.140 ± 0.0320.759 ± 0.01725.45 ± 0.04
(n-1)73.64 ± 0.7464.14 ±0.762.341 ± 0.0701.723 ± 0.1450.743 ± 0.01523.11 ± 0.05
(n-2)74.89 ± 0.2965.22 ± 0.472.298 ± 0.1151.392 ± 0.2720.794 ± 0.06522.10±0.03
(n-3)75.10 ± 0.7365.03 ± 0.582.133 ± 0.0861.360 ± 0.1630.785 ± 0.04120.05 ± 0.15
[n/2]73.71 ± 0.6161.25 ± 0.492.185 ± 0.2311.157 ± 0.0560.843 ± 0.01812.33 ± 1.20
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CSL4 CYCLES6 CYCLESCONNECTIVITYMulti-taskInvariant to vertex permutations?
(Accuracy %%)↑(Accuracy % %) ↑(Accuracy %)↑8 CYCLES (Accuracy %)↑(logMSE)↓DIAMETER (logMSE)↓SPECTRAL RADIUS (logMSE)↓
(n-1)GIN (orig.)4.66 ± 4.0093.0t92.7t92.5t-3.419 ± 0.3200.588 ± 0.354-2.130 ± 1.396
88.66 ± 22.6695.17 ± 4.9197.35 ± 0.7494.69 ± 2.34-3.575 ± 0.395-0.195 ± 0.714-2.732 ± 0.793
Reeooor(n-2)78.66 ± 22.1794.06±5.1097.50±0.7295.04 ± 2.69-3.799 ± 0.187-0.207 ± 0.381-2.344 ± 0.569
(n-3)73.33 ± 16.1996.61 ± 1.4097.84 ± 1.3794.48 ± 2.13-3.779 ± 0.0640.105 ±0.225-1.908 ± 0.860<<<<
[n/2]40.66 ± 9.0475.13 ± 0.2663.28 ± 0.5963.53 ± 1.14-3.765 ± 0.0830.564 ± 0.025-2.130 ± 0.166
GCN(orig.)6.66 ± 2.1098.336 ± 0.2495.73 ± 2.7287.14 ± 12.73-3.781 ± 0.0750.087 ± 0.186-2.204 ± 0.362
(n-1)100.00 ±0.0099.00 ±0.1097.63 ± 0.1994.99 ± 2.31-4.039 ± 0.101-1.175 ± 0.425-3.625 ± 0.536
(n-2)100.00±0.0098.77 ±0.6197.89 ± 0.6997.82 ± 1.10-3.970 ± 0.059-0.577 ± 0.135-3.397 ± 0.273
Reeeoss(n-3)96.00 ±6.4699.11 ± 0.1998.31 ± 0.5297.18 ± 0.58-3.995 ± 0.031-0.333 ± 0.117-3.105 ± 0.286
[n/2]49.33 ± 7.4275.19 ± 0.1966.04 ± 0.5963.66 ± 0.51-3.693 ± 0.0630.8518 ± 0.016-1.838 ± 0.054
PNA (orig.)10.00 ± 2.9881.59 ± 19.8695.57 ± 0.3684.81 ± 16.48-3.794 ± 0.155-0.605 ± 0.097-3.610 ± 0.137
(n-1)100.00 ±0.0097.88 ± 2.1999.18 ±0.2098.92 ± 0.72-3.904 ± 0.001-0.765 ± 0.032-3.954 ±0.118
Rreeoor (n-2)95.33 ± 7.7799.12 ± 0.2899.10 ± 0.5799.22 ± 0.27-3.781 ± 0.085-0.090 ± 0.135-3.478 ± 0.206
(n-3)95.33 ± 5.8189.36 ± 0.22 75.34 ±0.1899.34 ± 0.2693.92 ± 8.15 64.01 ± 0.30-3.710 ± 0.209 -2.977 ± 0.0650.042 ± 0.047-3.311 ± 0.067√
[n/2]42.66 ± 11.0365.58 ± 0.951.445 ± 0.037-1.073 ± 0.075
Positional GIN Ring-GNN99.33+ ± 1.3388.3†96.1†95.3t-1.61t-2.17-2.66tx<ν
10.00 ± 0.0099.9†100.0†71.4二
PPGN (3-WL)97.80 ± 10.9199.8†87.1†76.5†二二
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To pursue a high attack transferability, one plausible way is to find a common property across detectors, which facilitates the discovery of common weaknesses. We are the first to suggest that the relevance map for detectors is such a property. Based on it, we design a Relevance Attack on Detectors (RAD), which achieves a state-of-the-art transferability, exceeding existing results by above $20 \%$ . On MS COCO, the detection mAPs for all 8 black-box architectures are more than halved and the segmentation mAPs are also significantly influenced. Given the great transferability of RAD, we generate the first adversarial dataset for object detection, i.e., Adversarial Objects in COntext (AOCO), which helps to quickly evaluate and improve the robustness of detectors. + +# 1 INTRODUCTION + +Adversarial attacks (Szegedy et al. (2014); Goodfellow et al. (2015); Carlini & Wagner (2017); M ˛adry et al. (2017); Baluja & Fischer (2017); Su et al. (2019)) have revealed the fragility of Deep Neural Networks (DNNs) by fooling them with elaborately-crafted imperceptible perturbations. Among them, the black-box attack, i.e., attacking without knowledge of their inner structure and weights, is much harder, more aggressive and closer to real-world scenarios. For classifiers, there exist some promising black-box attacks (Papernot et al. (2016); Brendel et al. (2018); Dong et al. (2018); Xie et al. (2019); Lin et al. (2020); Chen et al. (2020)). It is also severe to attack object detection (Zhang & Wang (2019)) in a black-box manner, e.g., hiding certain objects from unknown detectors (Thys et al. (2019)). By that, life-concerning systems based on detection such as autonomous driving and security surveillance would be greatly influence. + +To the best of our knowledge, no existing attack is specifically designed for black-box transferability in detectors, because they have multiple-outputs and a high diversity across architectures. In such situations, adversarial samples do not transfer well (Su et al. (2018)), and most attacks only decrease mAP of black-box detectors by 5 to $10 \%$ (Xie et al. (2017); Li et al. (2018c;b)). To overcome this, we propose one plausible way to find common properties across detectors, which facilitates the discovery of common weaknesses. Based on them, the designed attack can threaten variable victims. + +In this paper, we adopt the relevance map as a common property, on which different detectors have similar interpretable results, as shown in Fig. 1. Based on relevance maps, we design a Relevance Attack on Detectors (RAD). RAD focuses on suppressing the relevance map rather than directly attacking the prediction as in existing works (Xie et al. (2017); Li et al. (2018c;a)). Because the relevance maps are quite similar across models, those of black-box models are influenced and misled as well in attack, leading to the great transferability. Although some works have adopted the relevance map as an indicator or reference of success attacks (Dong et al. (2019); Zhang & Zhu (2019); Chen et al. (2020); Wu et al. (2020a)), there is no work to directly attack the relevance maps of detectors to the best of our knowledge. + +In our comprehensive evaluation, RAD achieves the state-of-the-art transferability on 8 black-box models for COCO) dataset (Lin et al. (2014)), nearly halving the detection mAP. Interestingly, the adversarial samples of RAD also greatly influence the performance of instance segmentation, even only detectors are attacked. Given the high transferability of RAD, we create Adversarial Objects in COntext (AOCO), the first adversarial dataset for object detection. AOCO contains 10K samples that significantly decrease the performance of black-box models for detection and segmentation. AOCO may serve as a benchmark to test the robustness of a DNN or improve it by adversarial training. + +![](images/532cf52146221673a00f7d8064e690df7110aa3752fa5b8559f71cea00249ecd.jpg) +Figure 1: Relevance maps for models with different architectures. Three models not only predict the “stop sign” right, but also share similar relevance maps. + +# CONTRIBUTIONS + +• We propose a novel attack framework on relevance maps for detectors. We extend network visualization methods to detectors, find out the most suitable nodes to attack by relevance maps, and explore on the best update techniques to increase the transferability. • We evaluate RAD comprehensively and find its state-of-the-art transferability, which exceeds existing results by above $20 \%$ . Detection mAPs are more than halved, invalidating the stateof-the-art detectors to a large extent. By RAD, we create the first adversarial dataset for object detection, i.e., AOCO. As a potential benchmark, AOCO is generated from COCO and contains 10K high-transferable samples. AOCO helps to quickly evaluate and improve the robustness of detectors. + +# 2 RELATED WORK + +Since (Szegedy et al. (2014)), there have been lots of promising adversarial attacks (Goodfellow et al. (2015); Carlini & Wagner (2017); M ˛adry et al. (2017)). Generally, they fix the network weights and change the input slightly to optimize the attack loss. The network then predicts incorrectly on adversarial samples with a high confidence. (Papernot et al. (2016; 2017)) find that adversarial samples crafted by attacking a white-box surrogate model may transfer to other black-box models as well. Input modification (Xie et al. (2019); Dong et al. (2019); Lin et al. (2020)) or other optimization ways (Dong et al. (2018); Lin et al. (2020)) are validated to be effective in enhancing the transferability. + +(Xie et al. (2017)) extends adversarial attacks to detectors. It proposes to attack on densely generated bounding boxes. After that, losses about localization and classification are designed (Li et al. (2018c)) for attacking detectors. (Lu et al. (2017)) and (Li et al. (2018a)) propose to attack detectors in a restricted area. Existing works achieve good results in white-box scenarios, but are not specifically designed for transferability. The adversarial impact on black-box models is quite limited, i.e., a 5 to $10 \%$ decrease from the original mAP, even when two models only differ in backbone (Xie et al. (2017); Li et al. (2018c;b)). (Wang et al. (2020)) discusses black-box attacks towards detectors based on queries rather than the transferability as we do. The performance is satisfactory, but it requires over 30K queries, which is easy to be discovered by the model owner. Besides, physical attacks on white-box detectors are also feasible (Huang et al. (2020); Wu et al. (2020b); Xu et al. (2020)). + +For the great transferability, we propose to attack on relevance maps, which are calculated by network visualization methods (Zeiler & Fergus (2014); Selvaraju et al. (2017); Shrikumar et al. (2017)). They are originally developed to interpret how DNNs predict and help users gain trust on them. Specifically, they display how the input contributes to a certain node output in a pixel-wise manner. Typical works include Layer-wise Relevance Propagation (LRP) (Bach et al. (2015)), Contrastive LRP (Gu et al. (2018)) and Softmax Gradient LRP (SGLRP) (Iwana et al. (2019)). These methods encourage the reference of relevance maps in attack (Dong et al. (2019); Zhang & Zhu (2019); Chen et al. (2020); Wu et al. (2020a)), and also inspire us. However, none of them attack on relevance maps for detectors. + +RAD differs from (Ghorbani et al. (2019); Zhang et al. (2020)) in the goal. RAD misleads detectors by suppressing relevance maps. In contrast, (Ghorbani et al. (2019)) misleads the relevance maps while keeping the prediction unchanged. (Zhang et al. (2020)) also misleads DNNs, but it keeps the relevance maps unchanged. + +# 3 RELEVANCE ATTACK ON DETECTORS + +We propose an attack specifically designed for black-box transferability, named Relevance Attack on Detectors (RAD). RAD suppresses multi-node relevance maps for several bounding boxes. Since the relevance map is commonly shared by different detectors as shown in Fig. 1, attacking on it in the white-box surrogate model achieves a high transferability towards black-box models. In this section, we first provide a high-level overview of RAD, and analyze the potential reasons of its transferability. Then we thoroughly discuss three crucial concrete issues in RAD. + +• In Section 3.3, we specify the calculation of relevance maps for detectors, where current visualization methods are not applicable. +• In Section 3.4, we introduce the proper nodes to attack by RAD. +• In Section 3.5, we explore on the suitable techniques to update samples in RAD. + +# 3.1 WHAT IS RAD? + +We present the framework of RAD in Fig. 2. Initialized by the original sample $x _ { 0 }$ , the adversarial sample $x _ { k }$ in the $k ^ { \mathrm { { t h } } }$ iteration is forward propagated in the surrogate model, getting the prediction $f ( x _ { k } )$ . Current attacks generally suppress the prediction values of all attacked output nodes in $T$ . In contrast, RAD suppresses the corresponding relevance map $h ( \boldsymbol { x } _ { k } , T )$ . To restrain that, gradients of $h ( \boldsymbol { x } _ { k } , T )$ back propagate to $x _ { k }$ , which is then modified to $x _ { k + 1 }$ . + +![](images/d176c9609254b18a9a20a0467bc55eedcff17b807a627c6824363aab7ff06f3a.jpg) +Figure 2: Framework of RAD. $x _ { k }$ is the sample in iteration $k$ and $f ( x _ { k } )$ is the network prediction for it. $h ( \boldsymbol { x } _ { k } , T )$ stands for the relevance map for all attacked nodes in $T$ . RAD works by repeating processes denoted by “black”, “red” and “blue” arrows in turn. + +It is notable that RAD is a complete framework to attack detectors, and its each component requires a special design. Besides the calculation of relevance maps of detectors, other components in RAD, e.g., the attacked nodes or the update techniques, also need a customized analysis. The reason is that no existing work directly attacks the relevance of detectors, and the experience in attacking predictions is not totally applicable here. For example, (Zhang & Wang (2019)) emphasizes classification loss and localization loss equally, but the former is validated to be significantly better in attacking the relevance in Section 3.4. + +# 3.2 WHY RAD TRANSFERS? + +RAD’s transferability comes from the attack goal: changing the common properties, i.e., the relevance maps. As shown in Fig. 3, the relevance maps are clear and structured for the original sample in both detectors. After RAD, the relevance maps are induced to be meaningless without a correct focus, leading to wrong predictions, i.e., no or false detection. Because relevance maps transfer well across models, those for black-box detectors are also significantly influenced, causing a great performance drop, which is illustrated visually in Section 4.2. + +![](images/249f41e82d757b53efe52a9a203cba6c688813a5d70a898f39c29cb9afebf958.jpg) +Figure 3: RAD’s transferability origins from the change of relevance maps. The image contains a person and a skateboard. By attacking on relevance maps, both surrogate models make extremely confusing predictions. + +RAD also attacks quite “precisely”, i.e., the perturbation pattern is significantly focused on distinct areas and has a clear structure as shown in Fig. 4. That is to say, RAD accurately locates the most discriminating parts of a sample and concentrates the perturbation on them, leading to a great transferability when the perturbations is equally bounded. + +![](images/63ab5ec8395fab7e9a3955a560451309ecf40525acdc32dadc207a0abe714629.jpg) +Figure 4: The original image and the adversarial perturbations $\times 5$ in magnitude for demonstration) generated by Dfool (Lu et al. (2017)), DAG (Xie et al. (2017)), and RAD (from left to right) + +3.3 WHAT IS THE RELEVANCE MAPS FOR DETECTORS? + +We analyze the potential of RAD above, below we make it feasible by addressing three crucial issues. +To conduct the relevance attack, we first need to know the relevance maps for detectors. + +Currently, there have been lots of methods to calculate the relevance maps for classifiers as described in Section 2, but none of them are suitable for detectors. We take SGLRP (Iwana et al. (2019)) as an example to explain this and then to modify, because it excels in discriminating ability against irrelevant regions of a certain target node. + +SGLRP visualizes how the input contributes to one output node in a pixel-wise way by backpropagating the relevance from the output to the input based on Deep Taylor Decomposition (DTD) as illustrated in Appendix A. $R ^ { ( L ) }$ is the initial relevance in the output layer $L$ and its $n ^ { \mathrm { t h } }$ component is calculated as + +$$ +R _ { n } ^ { ( L ) } = { \left\{ \begin{array} { l l } { y _ { n } \left( 1 - y _ { n } \right) } & { n = t , } \\ { - y _ { n } y _ { t } } & { n \neq t , } \end{array} \right. } +$$ + +where $y _ { n }$ is the predicted probability of class $n$ , and $y _ { t }$ is that for the single-node target $t$ . The pixel-wise relevance map $h ( x , t )$ for the single-node target $t$ is calculated by back propagating the relevance $R$ from the final layer to the input following rules specified in (Iwana et al. (2019)). + +In detectors, we need the pixel-wise contributions from the input to $m$ bounding boxes. This multi-node relevance map could not be directly calculated by (1), so we naturally modify SGLRP as + +$$ +R _ { n } ^ { ( L ) } = \left\{ \begin{array} { l l } { y _ { n } \left( 1 - y _ { n } \right) } & { n \in T , } \\ { - \frac { 1 } { m } y _ { n } \sum _ { i = 1 } ^ { m } y _ { t _ { i } } } & { n \notin T , } \end{array} \right. +$$ + +where $y _ { t _ { i } }$ is the predicted probabilities for one target node $t _ { i }$ . $T$ is the set containing all target nodes $\{ t _ { 1 } , t _ { 2 } , . . . , t _ { m } \}$ . With iNNvestigate Library (Alber et al. (2019)) to implement Multi-Node SGLRP and Deep Learning platforms supporting auto-gradient, the gradients from RAD loss $L _ { \mathrm { R A D } } ( x ) = h ( x , T )$ to sample $x$ could be obtained according to the calculation rules of relevance maps in Appendix A. + +We illustrate the difference between SGLRP and our Multi-Node SGLRP in Fig. 5. SGLRP only displays the relevance map for one bounding box, e.g., “TV”, “chair” and “bottle”. Multi- Node SGLRP, in contrast, visualizes the overall relevance. + +![](images/a45412ecf81682fd77f346e329b0e1b5ce65e40a7e142423efbe4588b2d04216.jpg) +Figure 5: Difference between relevance maps from SGLRP and Multi-Node SGLRP. The relevance maps are for YOLOv3 (Redmon & Farhadi (2018)). + +# 3.4 WHERE TO ATTACK? + +Besides the calculation of relevance maps, it is also important to choose a proper node set $T$ to attack. +Specifically, we need to select certain bounding boxes and the corresponding output nodes for RAD. + +Heuristically, the most “obvious” bounding boxes are desired to be eliminated, so we select the bounding boxes with the highest confidence, following (Xie et al. (2017)). Concretely, it is feasible to statically choose $m$ bounding boxes to attack in each iteration, or dynamically attack all bounding boxes whose confidence exceeds a threshold. In our evaluation, the two strategies differ a little in performance and are not sensitive to hyper-parameter as demonstrated in Appendix C. This shows that RAD does not require a sophisticated tuning of parameters, which is user-friendly. In our following experiments, we statically attack $m = 2 0$ nodes. + +After selecting bounding boxes, we could attack their size, leading them to shrink; or their localization, leading them to shift; or their confidence, leading them to be misclassified. To adopt the best strategy, we conduct a toy experiment by attacking YOLOv3 (Redmon & Farhadi (2018)), denoted as M2 and other models are specified in Appendix B. Given the results in Table 1, the classification loss induces a better black-box transferability. This may because detectors generally include a pre-trained classification as the feature extractor, and relevance maps are believed to be an indicator of success attacks (Dong et al. (2019); Zhang & Zhu (2019)). + +Table 1: Detection mAP in RAD with different attacked nodes + +
StrategyM1M2M3M4M5M6M7M8M9
No Attack29.333.438.140.742.142.545.746.953.9
Size26.014.731.932.535.635.438.640.047.8
Localization22.86.427.428.131.730.834.435.945.1
Classification18.11.219.920.524.322.626.428.239.9
+ +# 3.5 HOW TO UPDATE? + +By the relevance map $h ( x , T )$ for certain attacked nodes $T$ , we are able to attack, i.e., update the original sample to become adversarial with the guidance of the attack gradients $g ( x )$ as + +$$ +g ( x ) = \frac { \partial L _ { \mathrm { R A D } } ( x ) } { \partial x } = \frac { \partial h ( x , T ) } { \partial x } . +$$ + +Some update techniques are validated to be effective for enhancing the transferability in classification. For example, Scale-Invariant (SI) (Lin et al. (2020)) proposes to average the attack gradients by scale copies of the samples as + +$$ +g _ { \mathrm { s i } } ( x ) = \frac { 1 } { k } \sum _ { i = 0 } ^ { k } g ( x / 2 ^ { i } ) . +$$ + +Besides SI, Diverse Input (DI) (Xie et al. (2019)), Translation-Invariant (TI) (Dong et al. (2019)) are also promising in classification. We are curious about whether they also work well in object detection. To explore on this, we adopt these techniques in RAD as the setting suggested by their designers (see Appendix E). From the results in Table 2, we discover that SI is quite effective, further decreasing the mAP from the baseline to a large extent. Accordingly, we adopt (4) to update the sample in RAD. + +Table 2: Detection mAP in RAD with different update techniques + +
TechniqueM1M2M3M4M5M6M7M8M9
None18.11.219.920.524.322.626.428.239.9
DI18.11.019.920.523.922.426.327.939.6
TI17.02.420.820.825.223.027.929.741.5
SI14.60.716.317.020.419.122.323.835.0
+ +With the calculated gradient, we update the sample as + +$$ +x _ { k + 1 } = \mathrm { c l i p } _ { \varepsilon } \left( x _ { k } - \alpha \frac { g _ { \mathrm { s i } } ( x _ { k } ) } { | | g _ { \mathrm { s i } } ( x _ { k } ) | | _ { 1 } / N } \right) , +$$ + +where $\alpha$ stands for the step length. $x$ is $\ell _ { \infty }$ -norm bounded by $\varepsilon$ from the original sample in each iteration as in (Xie et al. (2019); Dong et al. (2019); Lin et al. (2020)). Gradient $g ( x )$ is normalized by its average $\ell _ { 1 }$ -norm,i.e., $| | g ( x ) | | _ { 1 } / N$ to prevent numerical errors and control the degree of perturbations. $N$ is the dimension of the image, i.e., $N = h e i g h t \times w i d t h \times c h a n n e l .$ Division by $N$ is necessary because $\ell _ { 1 }$ -norm sums all components of the tensor $x$ , which is too large as a normalization factor. We do not adopt the mainstream sign method because it is not suitable to generate small perturbations as shown in other attacks in detectors (Xie et al. (2017)). + +# 4 EXPERIMENTS + +In this section, we evaluate the performance of RAD, especially its transferability. The results are presented numerically and visually. In comprehensive evaluation, RAD achieves a great transferability in across models and even across tasks. + +# 4.1 SETUP + +Our experiments are based on Keras (Chollet et al. (2015)), Tensorflow (Abadi et al. (2015)) and PyTorch (Paszke et al. (2019)) in 4 NVIDIA GeForce RTX 2080Ti GPUs. Library iNNvestigate (Alber et al. (2019)) is used to implement Multi-Node SGLRP. + +We conduct experiments on MS COCO 2017 dataset (Lin et al. (2014)), which is a large-scale benchmark for object detection, instance segmentation and image captioning. For a fair evaluation, we generate adversarial samples from all 5K samples in its validation set and test several black-box models on their mAP, a standard criteria in many works (He et al. (2017); Chen et al. (2019a)). + +All attacks are conducted with the step length $\alpha = 2$ for 10 iterations and the perturbation is $\ell _ { \infty }$ - bounded in $\varepsilon = 1 6$ to guarantee the imperceptibility as in (Dong et al. (2019)). To validate that the mAP drop comes from the attack instead of resizing or perturbation, we add large Gaussian noises $( \sigma = 9$ ) to the resized images, and report it as “Ablation”. + +We choose 8 typical detectors ranging from the first end-to-end detector to recent ones for attack and test. The variety of model guarantees the validity of results. We specify their information in Appendix B and the corresponding pre-processing in Appendix E. + +# 4.2 VISUAL RESULTS OF RAD + +We visualize several predictions on the same adversarial sample by black-box models in Fig. 6 to intuitively illustrate the transferability of RAD. The objects in the image, e.g., the laptop and keyboard, are quite large and obvious to detect. However, with a small perturbation from RAD, 5 black-box models all fail to detect the laptop, keyboard and mouse. Surprisingly, 4 of them even detect a non-existent “bed”, which is neither relevant nor similar in the image. The attack process of RAD is analyzed in Appendix F. + +![](images/f3ddcdba9a9215b81c2eaf82d628a1c96039b1c11d3762d6ba4245add204ea1f.jpg) +Figure 6: RAD has a great transferability. The same adversarial sample generated by attacking Mask R-CNN fools all 5 black-box detectors. + +# 4.3 RAD’S TRANSFERABILITY IN OBJECT DETECTION + +To evaluate the in-domain transferability of detection attacks and cross-domain transferability of classification attacks, we test the detection mAP of 8 models in COCO adversarial samples generated in the same setting. + +For detection attacks, adversarial samples are crafted by attacking surrogate model M2 (YOLOv3 Redmon & Farhadi (2018)). Results of attacking other surrogates are reported in Appendix D. For classification attacks, we use the model output on the clean sample as the label. By several state-of-the-art attacks on surrogate classifiers (InceptionV3 Szegedy et al. (2016) here as in Xie et al. (2019); Dong et al. (2019)), the adversarial samples are generated and tested the mAP as the transferability towards detectors. Details of implementation are described in Appendix E. + +We present the results in Table 3. Among the classification attacks and detection ones, cross-domain attack (Naseer et al. (2019)) is effective, but RAD is more aggressive. RAD enjoys a state-of-theart transferability towards most black-box models, outperforming other methods for above $20 \%$ . The detection mAPs are more than halved, making state-of-the-art detectors worse than the early single-shot detector (SSD Liu et al. (2016), M1). + +Table 3: Detection mAP in different attacks + +
MethodM1M2M3M4M5M6M7M8M9
ReferenceNo Attack Ablation29.3 24.933.4 31.438.1 31.240.7 31.642.1 35.042.5 34.345.7 37.546.9 38.853.9 48.6
Classification AttackPGD SI-PGD26.4 27.530.4 31.634.4 36.135.4 37.138.438.341.743.151.1
MI-DI-PGD22.926.240.040.143.544.852.4
MI-TI-PGD29.330.033.232.136.037.548.0
CD-painting20.1 16.423.7 20.824.9 21.325.4 22.830.1 26.627.4 24.532.8 28.934.5 29.547.1 42.3
Detection AttackCD-comics16.621.621.722.726.824.329.142.343.7
Dfool23.32.529.229.833.332.936.538.047.5
Loc DAG21.9 20.80.225.826.629.829.433.233.245.2
OursRAD14.60.6 0.722.8 16.323.4 17.026.8 20.425.6 19.128.9 22.331.0 23.840.6 35.0
+ +The influence of $\varepsilon$ on detection mAP in RAD are displayed in Fig. 7. With the $\ell _ { \infty }$ bound increases, the resulting mAP greatly decreases for all black-box models especially for $\varepsilon$ from 8 to 12. + +![](images/a2da1b2cd3f09b13287065c5673de5c813feaeb1b97bca2660057b3e05804b22.jpg) +Figure 7: The influence of $\varepsilon$ on detection mAP in RAD + +# 4.4 RAD’S TRANSFERABILITY TO INSTANCE SEGMENTATION + +Detection and segmentation are similar in some aspects, so they could be implemented in one network (He et al. (2017); Cai & Vasconcelos (2018); Chen et al. (2019a)). Also, adversarial samples for object detection tend to transfer to instance segmentation (Xie et al. (2017)). Accordingly, we evaluate this cross-task transferability by RAD on surrogate detectors YOLOv3 (Redmon & Farhadi (2018), M2), RetinaNet (Lin et al. (2017), M3) and Mask R-CNN (He et al. (2017), M5). From the results in Table 4, we find that RAD also greatly hurts the performance of instance segmentation, leading to a drop on mAP of over $70 \%$ . This inspire the segmentation attackers to indirectly attack detectors. + +Table 4: Segmentation mAP of RAD + +
mAPmAP50mAP75
SurrogateM5M7M8M5M7M8M5M7M8
None38.039.440.860.661.363.340.942.944.1
Ablation31.031.933.551.251.053.732.434.335.4
M217.918.620.331.631.734.518.018.920.7
M311.611.912.919.219.120.712.112.613.7
M51.211.111.82.417.918.91.011.912.6
+ +# 5 ADVERSARIAL OBJECTS IN CONTEXT + +Given the great transferability of RAD, we create Adversarial Objects in COntext (AOCO), the first adversarial dataset for object detection. AOCO dataset serves as a potential benchmark to evaluate the robustness of detectors, which will be beneficial to network designers. It will also be useful for adversarial training, as the most effective practice to improve the robustness of DNNs Zhang et al. (2019); Tramèr et al. (2018). Notice that there is no other adversarial dataset for detection at all. This is not because the dataset is useless, but due to the low transferability of attack methods such that the examples are detector-dependent. Now we have achieved high transferability and can then make such an adversarial dataset publicly available. + +AOCO is generated from the full COCO 2017 validation set (Lin et al. (2014)) with $5 \mathrm { k }$ samples. It contains 5K adversarial samples for evaluating object detection (AOCO detection) and 5K for instance segmentation (AOCO segmentation). All 10K samples in AOCO are crafted by RAD. The surrogate model we attack is YOLOv3 for AOCO detection and Mask R-CNN for AOCO segmentation given the results in Table 3 and Table 4. + +We measure the perturbation $\Delta x$ in AOCO by Root Mean Squared Error (RMSE) as in (Xie et al. (2017); Liu et al. (2017)). It is calculated as $\sqrt { \textstyle \sum _ { i } ( \Delta x _ { i } ) ^ { 2 } / N }$ in a pixel-wise way, and $N$ is the size of the image. Performance of AOCO is reported in Table 5. The RMSE in AOCO is lower than that in (Wu et al. (2019)), and the perturbation is quite imperceptible. Details and samples of AOCO are presented in Appendix G. + +Table 5: Detection mAP and segmentation mAP on COCO and AOCO + +
RMSEM1M2M3M4M5M6M7M8M9
COCO detection AOCO detection0.000 6.46929.3 14.633.4 0.738.1 16.340.7 1742.1 20.442.5 19.145.7 22.346.9 23.853.9 35.0
COCO segmentation0.000N38.039.440.8\\
AOCO segmentation6.606广广\\1.2一11.111.8
+ +# 6 CONCLUSION + +To pursue a high transferability, this paper proposes Relevance Attack on Detectors (RAD), which works by suppressing the multi-node relevance, a common property across detectors calculated by our Multi-Node SGLRP. We also thoroughly discuss where to attack and the how to update in attacking relevance maps. RAD achieves a state-of-the-art transferability towards 8 diverse black-box models, exceeding existing results by above $20 \%$ , and also significantly hurts the instance segmentation. Given the great transferability of RAD, we generate the first adversarial dataset for object detection, i.e., Adversarial Objects in COntext (AOCO), which helps to quickly evaluate and improve the robustness of detectors. Also, attacking other common properties is promising for a good transferability. + +# REFERENCES + +Martín Abadi, Ashish Agarwal, Paul Barham, Eugene Brevdo, Zhifeng Chen, Craig Citro, Greg S. 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You only propagate once: Painless adversarial training using maximal principle. arXiv preprint arXiv:1905.00877, 2019. + +Haichao Zhang and Jianyu Wang. Towards adversarially robust object detection. In Proceedings of the IEEE International Conference on Computer Vision, pp. 421–430, 2019. + +Tianyuan Zhang and Zhanxing Zhu. Interpreting adversarially trained convolutional neural networks. In Proceedings of the 36th International Conference on Machine Learning, ICML 2019, 9-15 June 2019, Long Beach, California, USA, pp. 7502–7511, 2019. + +Xinyang Zhang, Ningfei Wang, Hua Shen, Shouling Ji, Xiapu Luo, and Ting Wang. Interpretable deep learning under fire. In 29th {USENIX} Security Symposium ({USENIX} Security 20), 2020. + +# A RELEVANCE BACK-PROPAGATION RULES (DTD) + +DTD-based network visualization methods, such as LRP, CLRP and SGLRP, back-propagate the relevance from the output layer to the input layer according to the rules specified in this section. Their only difference is the relevance in the initial output layer $\bar { R } _ { n } ^ { ( L ) }$ . + +For each layer $l$ in a DNN with $L$ layers in total, suppose layer $l$ has $N$ nodes and layer $l + 1$ has $M$ nodes, the relevance $R _ { n } ^ { ( L ) }$ at node $n$ in layer $l$ is defined recursively by + +$$ +R _ { n } ^ { ( l ) } = \sum _ { m } \frac { a _ { n } ^ { ( l ) } w _ { n , m } ^ { + ( l ) } } { \sum _ { n ^ { \prime } } a _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { + ( l ) } } R _ { m } ^ { ( l + 1 ) } , +$$ + +for nodes with definite positive values (such as after ReLU), and + +$$ +R _ { n } ^ { ( l ) } = \sum _ { m } \frac { z _ { n } ^ { ( l ) } w _ { n , m } ^ { ( l ) } - b _ { n } ^ { ( l ) } w _ { n , m } ^ { + ( l ) } - h _ { n } ^ { ( l ) } w _ { n , m } ^ { - ( l ) } } { \sum _ { n ^ { \prime } } z _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { ( l ) } - b _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { + ( l ) } - h _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { - ( l ) } } R _ { m } ^ { ( l + 1 ) } , +$$ + +for nodes that may have negative values. In the formulas above, $a _ { n } ^ { ( l ) }$ is the post-activation output of node in layer $l$ and $z _ { n } ^ { ( l ) }$ is the pre-activation one. The range $[ b _ { n } ^ { ( l ) } , h _ { n } ^ { ( l ) } ]$ stands for the minimum and maximum of $z _ { n } ^ { ( l ) }$ . Finally, $w _ { n , m } ^ { + ( l ) } = \operatorname* { m a x } \left( w _ { n , m , 0 } ^ { ( l ) } \right)$ and $w _ { n , m } ^ { - ( l ) } = \operatorname* { m i n } \left( w _ { n , m , 0 } ^ { ( l ) } \right)$ . + +According to the propagation rules above as mentioned in (Iwana et al. (2019)), we could naturally obtain the attack gradients as + +$$ +\frac { \partial R _ { m } ^ { ( l + 1 ) } } { \partial R _ { n } ^ { ( l ) } } = \left\{ \begin{array} { l l } { \big ( \sum _ { m } \frac { a _ { n } ^ { ( l ) } w _ { n , m } ^ { + ( l ) } } { \sum _ { n ^ { \prime } } a _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { + ( l ) } } \big ) ^ { - 1 } , \mathrm { f o r ~ n o d e s ~ w i t h ~ d e f i n i t e ~ p o s i t i v e ~ v a l u e s } } \\ { \big ( \sum _ { m } \frac { z _ { n } ^ { ( l ) } w _ { n , m } ^ { ( l ) } - b _ { n } ^ { ( l ) } w _ { n , m } ^ { + ( l ) } - h _ { n } ^ { ( l ) } w _ { n , m } ^ { - ( l ) } } { \sum _ { n ^ { \prime } } z _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { ( l ) } - b _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { + ( l ) } - h _ { n ^ { \prime } } ^ { ( l ) } w _ { n ^ { \prime } , m } ^ { - ( l ) } } \big ) ^ { - 1 } , \mathrm { o t h e r w i s e } } \end{array} \right. . +$$ + +# B MODEL INFORMATION + +Table 6 presents the models’ information from our evaluation and MMdetection (Chen et al. (2019b)). + +Table 6: Model backbone and mAPs + +
IDModelBackbonemAP
M1SSD512 (Liu et al. (2016))VGG1629.3
M2YOLOv3 (Redmon & Farhadi (2018))Darknet33.4
M3RetinaNet (Lin et al. (2017))ResNet-10138.1
M4Faster R-CNN (Ren et al. (2015))ResNeXt-101-64*4d40.7
M5Mask R-CNN (He et al. (2017))ResNeXt-101-64*4d42.1
M6Cascade RCNN (Cai & Vasconcelos (2018))ResNet-10142.5
M7Cascade Mask R-CNN (Cai & Vasconcelos (2018))ResNeXt-101-64*4d45.7
M8Hyrbrid Task Cascade (Chen et al. (2019a))ResNeXt-101-64*4d46.9
M9EfficientDet (Tan et al. (2020))EfficientNet+BiFPN53.9
+ +# C INFLUENCE OF HYPER-PARAMETERS IN NODE SELECTION + +Performance of RAD is not sensitive to hyper-parameter, no matter the strategy to select bounding boxes is dynamic or static as Table 7. Attackers are not bothered to tune them carefully. The parameter for dynamic strategy refers to the pre-softmax confidence threshold to select a bounding box. The parameter for static strategy refers to the fixed number of selected bounding boxes in each iteration. + +# D RAD ON MORE SURROGATES + +The results on attacking more surrogates by RAD are reported in Table 8. + +Table 7: Detection mAP in different hyper-parameters in RAD + +
StrategyParameterM1M2M3M4M5M6M7M8M9
Dynamic-118.31.220.020.624.322.826.728.340.0
-218.21.220.120.724.222.826.628.039.8
-318.41.320.320.824.322.926.728.540.2
Static1018.21.119.920.524.222.826.228.039.8
2018.11.219.920.524.322.626.428.239.9
3018.21.320.120.724.322.826.027.940.1
+ +Table 8: Detection mAP of RAD on different surrogates + +
SurrogateM1M2M3M4M5M6M7M8M9
YOLOv314.60.716.317.020.419.122.323.835.0
Mask R-CNN20.424.225.726.51.128.933.134.945.4
RetinaNet20.76.12.325.729.328.231.733.844.1
+ +# E IMPLEMENTATION DETAILS + +# E.1 PRE-PROCESSING + +To pre-process, we resize the image with its long side as 416 for YOLOv3 or RetinaNet and 448 for Mask R-CNN, and then zero-pad it to a square. The resolution is kept relatively the same for a fair evaluation. Images are normalized to [0,1] in YOLOv3 or subtracted by the mean of COCO training set in RetinaNet and Mask R-CNN. Accordingly, samples in AOCO detection have the long side 416 and that for AOCO segmentation is 448. + +# E.2 TRANSFER-ENHANCING UPDATE TECHNIQUES + +DI (Xie et al. (2019)) transforms the image for 4 times with probability $p$ $\mathbf { \boldsymbol { p } } = 1$ for better transferability as suggested) and averaging the gradients. The transformation is to resize the image to $0 . 9 \times$ its size and randomly padding the outer areas with white pixels. SI (Lin et al. (2020)) divides the sample numerically by the power 2 for 4 times and averages the 4 obtained gradients. TI (Dong et al. (2019)) translates the image to calculate the augmented gradients. To implement it efficiently, it adopts a kernel to simulate the averaging of gradients. We choose the kernel size 15 as suggested. MI (Dong et al. (2018)) uses momentum optimization (parameter $\mu = 1$ as suggested) for a better transferability and a faster attack. Cross-domain attack (Naseer et al. (2019)) uses extra datasets (paintings, denoted as CD-paintings, and comics, denoted as CD-comics) to train a perturbation generator with the relative loss. The adopted surrogate model is also InceptionV3 for consistency. All perturbations are resized to fit the sample size. + +# E.3 DETECTION ATTACKS + +For DAG (Xie et al. (2017)), we follow the setting of generating dense proposals. The classification probabilities of 3000 bounding boxes with highest confidence are attacked. But we alter its optimization to (5) because its original update produces quite small perturbation, leading to a poor transferability, which is unfair for comparison. Dfool (Lu et al. (2017)) suppresses the classification confidence for the original bounding boxes, which is the same in our experiment. Localization loss is shown to be useful in (Zhang & Wang (2019)), and here we suppress the width and height of the original bounding boxes. + +# F VISUAL RESULTS OF RAD PROCESS + +By RAD, the relevance map is attacked to be meaningless and loss its focus. In Fig. 8, the initial prediction is correct and the relevance map is clear. RAD constantly misleads the relevance map to be unstructured without outline of objects. Finally, all bounding boxes vanish. + +![](images/95ea87cc03ebb9e5d0232975306185915289b6e281665271ac23ef4ee01c0c56.jpg) +Figure 8: Transition of prediction and relevance map in RAD (from top to bottom and left to right). + +# G MORE ABOUT AOCO + +We report the mAP50 and mAP75 of AOCO in Table 9 and Table 10. We show in Fig. 9 the visual comparative results. + +Table 9: Detection mAP50 and segmentation mAP50 on COCO and AOCO + +
M1M2M3M4M5M6M7M8M9
COCO detection AOCO detection49.2 26.756.4 1.658.1 27.662.0 29.163.8 34.560.7 29.964.1 34.366.0 37.474.3 51.7
COCO segmentation人一60.6一61.363.3一
AOCO segmentation2.4一17.918.9一
+ +Table 10: Detection mAP75 and segmentation mAP75 on COCO and AOCO + +
M1M2M3M4M5M6M7M8M9
COCO detection AOCO detection30.8 14.235.8 0.640.6 16.544.6 17.146.3 20.846.3 19.950.0 23.351.2 24.659.9 37.4
COCO segmentation//40.9一42.944.1一
AOCO segmentation1.0/11.912.6
+ +![](images/93f75b8037c78908db07fd96e74d56484522f7c49490b9643c1b77d5e76d509b.jpg) +Figure 9: Detection and segmentation results in COCO and AOCO by YOLOv3 and Mask R-CNN. For COCO, both networks predict correctly. 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MethodM1M2M3M4M5M6M7M8M9
ReferenceNo Attack Ablation29.3 24.933.4 31.438.1 31.240.7 31.642.1 35.042.5 34.345.7 37.546.9 38.853.9 48.6
Classification AttackPGD SI-PGD26.4 27.530.4 31.634.4 36.135.4 37.138.438.341.743.151.1
MI-DI-PGD22.926.240.040.143.544.852.4
MI-TI-PGD29.330.033.232.136.037.548.0
CD-painting20.1 16.423.7 20.824.9 21.325.4 22.830.1 26.627.4 24.532.8 28.934.5 29.547.1 42.3
Detection AttackCD-comics16.621.621.722.726.824.329.142.343.7
Dfool23.32.529.229.833.332.936.538.047.5
Loc DAG21.9 20.80.225.826.629.829.433.233.245.2
OursRAD14.60.6 0.722.8 16.323.4 17.026.8 20.425.6 19.128.9 22.331.0 23.840.6 35.0
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mAPmAP50mAP75
SurrogateM5M7M8M5M7M8M5M7M8
None38.039.440.860.661.363.340.942.944.1
Ablation31.031.933.551.251.053.732.434.335.4
M217.918.620.331.631.734.518.018.920.7
M311.611.912.919.219.120.712.112.613.7
M51.211.111.82.417.918.91.011.912.6
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IDModelBackbonemAP
M1SSD512 (Liu et al. (2016))VGG1629.3
M2YOLOv3 (Redmon & Farhadi (2018))Darknet33.4
M3RetinaNet (Lin et al. (2017))ResNet-10138.1
M4Faster R-CNN (Ren et al. (2015))ResNeXt-101-64*4d40.7
M5Mask R-CNN (He et al. (2017))ResNeXt-101-64*4d42.1
M6Cascade RCNN (Cai & Vasconcelos (2018))ResNet-10142.5
M7Cascade Mask R-CNN (Cai & Vasconcelos (2018))ResNeXt-101-64*4d45.7
M8Hyrbrid Task Cascade (Chen et al. (2019a))ResNeXt-101-64*4d46.9
M9EfficientDet (Tan et al. (2020))EfficientNet+BiFPN53.9
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StrategyParameterM1M2M3M4M5M6M7M8M9
Dynamic-118.31.220.020.624.322.826.728.340.0
-218.21.220.120.724.222.826.628.039.8
-318.41.320.320.824.322.926.728.540.2
Static1018.21.119.920.524.222.826.228.039.8
2018.11.219.920.524.322.626.428.239.9
3018.21.320.120.724.322.826.027.940.1
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SurrogateM1M2M3M4M5M6M7M8M9
YOLOv314.60.716.317.020.419.122.323.835.0
Mask R-CNN20.424.225.726.51.128.933.134.945.4
RetinaNet20.76.12.325.729.328.231.733.844.1
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M1M2M3M4M5M6M7M8M9
COCO detection AOCO detection49.2 26.756.4 1.658.1 27.662.0 29.163.8 34.560.7 29.964.1 34.366.0 37.474.3 51.7
COCO segmentation人一60.6一61.363.3一
AOCO segmentation2.4一17.918.9一
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M1M2M3M4M5M6M7M8M9
COCO detection AOCO detection30.8 14.235.8 0.640.6 16.544.6 17.146.3 20.846.3 19.950.0 23.351.2 24.659.9 37.4
COCO segmentation//40.9一42.944.1一
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No newline at end of file diff --git a/parse/train/g-wu9TMPODo/g-wu9TMPODo.md b/parse/train/g-wu9TMPODo/g-wu9TMPODo.md new file mode 100644 index 0000000000000000000000000000000000000000..6f99e2694ccc18867852ae803be8021fb6bb37f2 --- /dev/null +++ b/parse/train/g-wu9TMPODo/g-wu9TMPODo.md @@ -0,0 +1,673 @@ +# HOW BENIGN IS BENIGN OVERFITTING? + +# Amartya Sanyal + +# Varun Kanade + +Department of Computer Science, +University of Oxford, +Oxford, UK +The Alan Turing Institute, London, UK +amartya.sanyal@cs.ox.ac.uk +Department of Computer Science +University of Oxford, +Oxford, UK +The Alan Turing Institute, London, UK +varunk@cs.ox.ac.uk Puneet K.Dokania +Department of Engineering Science University of Oxford, Oxford, UK Five AI Limited +puneet@robots.ox.ac.uk + +Philip H.S. Torr Department of Engineering Science University of Oxford, Oxford, UK phst@robots.ox.ac.uk + +# ABSTRACT + +We investigate two causes for adversarial vulnerability in deep neural networks: bad data and (poorly) trained models. When trained with SGD, deep neural networks essentially achieve zero training error, even in the presence of label noise, while also exhibiting good generalization on natural test data, something referred to as benign overfitting (Bartlett et al., 2020; Chatterji & Long, 2020). However, these models are vulnerable to adversarial attacks. We identify label noise as one of the causes for adversarial vulnerability, and provide theoretical and empirical evidence in support of this. Surprisingly, we find several instances of label noise in datasets such as MNIST and CIFAR, and that robustly trained models incur training error on some of these, i.e. they don’t fit the noise. However, removing noisy labels alone does not suffice to achieve adversarial robustness. We conjecture that in part sub-optimal representation learning is also responsible for adversarial vulnerability. By means of simple theoretical setups, we show how the choice of representation can drastically affect adversarial robustness. + +# 1 INTRODUCTION + +Modern machine learning methods achieve a very high accuracy on wide range of tasks, e.g. in computer vision, natural language processing etc. However, especially in vision tasks, they have been shown to be highly vulnerable to small adversarial perturbations that are imperceptible to the human eye (Dalvi et al., 2004; Biggio & Roli, 2018; Goodfellow et al., 2014) . This vulnerability poses serious security concerns when these models are deployed in real-world tasks (cf. (Papernot et al., 2017; Schonherr et al., 2018; Hendrycks et al., 2019b; Li et al., 2019a)). A large body of research has been ¨ devoted to crafting defences to protect neural networks from adversarial attacks (e.g. (Goodfellow et al., 2014; Papernot et al., 2015; Tramer et al., 2018; Madry et al., 2018; Zhang et al., 2019)). \` However, such defences have usually been broken by future attacks (Athalye et al., 2018; Tramer et al., 2020). This arms race between attacks and defenses suggests that to create a truly robust model would require a deeper understanding of the source of this vulnerability. + +Our goal in this paper is not to propose new defenses, but to provide better answers to the question: what causes adversarial vulnerability? In doing so, we also seek to understand how existing methods designed to achieve adversarial robustness overcome some of the hurdles pointed out by our work. We identify two sources of adversarial vulnerability that, to the best of our knowledge, have not been properly studied before: a) memorization of label noise, and b) improper representation learning. + +Overfitting Label Noise: Starting with the celebrated work of Zhang et al. (2016) it has been observed that neural networks trained with SGD are capable of memorizing large amounts of label noise. Recent theoretical work (e.g. (Liang & Rakhlin, 2018; Belkin et al., 2018b;a; Hastie et al., 2019; + +![](images/8688c97a8556d473dbdf86805384d6b5d52c8d427a1c16c674193607253c40a1.jpg) +Figure 1: Label noise in CIFAR10 and MNIST. Text above the image indicates the training set label. + +Belkin et al., 2019a;b; Bartlett et al., 2020; Muthukumar et al., 2020; Chatterji & Long, 2020)) has also sought to explain why fitting training data perfectly does not lead to a large drop in test accuracy, as the classical notion of overfitting might suggest. This is commonly referred to as memorization or interpolation. We show through simple theoretical models, as well as experiments on standard datasets, that there are scenarios where label noise causes significant adversarial vulnerability, even when high natural (test) accuracy can be achieved. Surprisingly, we find that label noise is not at all uncommon in datasets such as MNIST and CIFAR-10 (see Figure 1). + +Our experiments show that robust training methods like Adversarial training (AT) (Madry et al., 2018) and TRADES (Zhang et al., 2019) produce models that incur training error on at least some of the noisy examples,but also on atypical examples from the classes (Zhang & Feldman, 2020). Viewed differently, robust training methods are unable to differentiate between atypical correctly labelled examples (rare dog) and a mislabelled example (cat labelled as dog) and end up not memorizing either; interestingly, the lack of memorizing these atypical examples has been pointed out as an explanation for slight drops in test accuracy, as the test set often contains similarly atypical (or even identical) examples in some cases Feldman (2019); Zhang & Feldman (2020). We point out this phenomenon for robust models through visual examples on MNIST, CIFAR10, and Imagenet (c.f. Figure 4). + +Representation Learning and Robustness: Recent works (Tsipras et al., 2019) and Zhang et al. (2019) have argued that the trade-off between robustness and accuracy might be unavoidable. However, their setting involves a distribution that is not robustly separable by any classifier. In such a situation there is indeed a trade-off between robustness and accuracy. In this paper, we focus on settings where robust classifiers exist, which is a more realistic scenario for real-world data. At least for vision, one may well argue that “humans” are robust classifiers, and as a result we would expect that classes are well-separated at least in some representation space. In fact, Yang et al. (2020) show that classes are already well-separated in the input space. In such situations, there is no need for robustness to be at odds with accuracy. A more plausible scenario which we posit, and provide theoretical evidence in support of in Theorem 2, is that depending on the choice of representations, the trade-off may exist or can be avoided. Recent empirical work (Sanyal et al., 2020a; Mao et al., 2020) has also established that modifying the training objective to favour certain properties in the learned representations can automatically lead to improved robustness. However, we show in Section 3.2 that some training algorithms can create an apparent trade-off even though the trade-off might not necessarily be fundamental to the problem. + +On a related note, it has been suggested in recent works that adversarially robust learning may require more “complex” decision boundaries, and as a result may require more data (Shah et al.; Schmidt et al., 2018; Yin et al., 2019; Nakkiran, 2019; Madry et al., 2018). However, the question of decision boundaries in neural networks is subtle as the network learns a feature representation as well as a decision boundary on top of it. We develop concrete theoretical examples in Theorem 2 and 3 to establish that choosing one feature representation over another may lead to visually more complex decision boundaries on the input space, though these are not necessarily more complex in terms of statistical learning theoretic concepts such as VC dimension. + +# Summary of Theoretical Contributions + +1. We provide simple sufficient conditions on the data distribution under which any classifier that fits the training data with label noise perfectly is adversarially vulnerable. + +2. There exists data distributions and training algorithms, which when trained with (some fraction of) random label noise have the following property: (i) using one representation, it is possible + +to have high natural and robust test accuracies but at the cost of having training error; (ii) using another representation, it is possible to have no training error (including fitting noise) and high test accuracy, but low robust accuracy. (See Theorem 2). + +The second example shows that the choice of representation matters significantly when it comes to adversarial accuracy, and that memorizing label noise directly leads to loss of robust accuracy. + +# Summary of Experimental Contributions + +1. As predicted theoretically, neural nets trained to convergence with label noise have greater adversarial vulnerability. (See Section 3.1). +2. Robust training methods, such as AT and TRADES that have higher robust accuracy, avoid overfitting (some) label noise. This behaviour is also partly responsible for their decrease in natural test accuracy. (See Section 3.2). +3. To demonstrate the benefit of representation learning for adversarial robustness, we show that learning richer representation by training with more fine-grained labels, subclasses within each class, leads to higher robust accuracy. (Due to lack of space we moved this to Appendix C.3). + +While our primary contribution is showing the effect of overfitting label noise on adversarial robustness, we hope our theoretical and experimental evidences on the importance of representation learning for robustness will inspire further research in this direction. + +# 2 THEORETICAL SETTING + +We develop a simple theoretical framework to demonstrate how overfitting, even very minimal, label noise causes significant adversarial vulnerability. We also show in Theorem 2 and 3 how the choice of representation can significantly affect robust accuracy. Although we state the results for binary classification, they can easily be generalized to multi-class problems. We formally define the notions of natural (test) error and adversarial error. + +Definition 1 (Natural and Adversarial Error). For any distribution $\mathcal { D }$ defined over $( \mathbf { x } , y ) \in \mathbb { R } ^ { d } \times$ $\{ 0 , 1 \}$ and any binary classifier $f : \mathbb { R } ^ { d } \{ 0 , 1 \}$ , + +• the natural error is + +$$ +\mathcal { R } ( f ; \mathcal { D } ) = \mathbb { P } _ { ( \mathbf { x } , y ) \sim \mathcal { D } } \left[ f \left( \mathbf { x } \right) \neq y \right] , +$$ + +• i ${ { \bf \mathcal { C } } \it { B _ { \gamma } } } ( { \bf { x } } )$ is a ball of radius $\gamma \geq 0$ around $\mathbf { x }$ under some norm1, the $\gamma$ -adversarial error is + +$$ +\begin{array} { r } { \mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { D } ) = \mathbb { P } _ { ( \mathbf { x } , y ) \sim \mathcal { D } } \left[ \exists \mathbf { z } \in \mathcal { B } _ { \gamma } \left( \mathbf { x } \right) ; f \left( \mathbf { z } \right) \neq y \right] , } \end{array} +$$ + +In the rest of the section, we provide theoretical results to show the effect of overfitting label noise on the robustness of classifiers. + +# 2.1 OVERFITTING LABEL NOISE + +The following result provides a sufficient condition under which even a small amount of label noise causes any classifier that fits the training data perfectly to have significant adversarial error. Informally, Theorem 1 states that if the data distribution has significant probability mass in a union of (a relatively small number of, and possibly overlapping) balls, each of which has roughly the same probability mass (cf. Eq. (3)), then even a small amount of label noise renders this entire region vulnerable to adversarial attacks to classifiers that fit the training data perfectly. + +Theorem 1. Let c be the target classifier, and let $\mathcal { D }$ be a distribution over $\left( \mathbf { x } , y \right)$ , such that $y = c \left( \mathbf { x } \right)$ in its support. Using the notation $\mathbb { P } _ { \mathcal { D } } [ A ]$ to denote $\mathbb { P } _ { ( \mathbf { x } , y ) \sim \mathcal { D } } [ \mathbf { x } \in A ]$ for any measurable subset $A \subseteq \mathbb { R } ^ { d }$ , suppose that there exist $c _ { 1 } \geq c _ { 2 } > 0$ , $\rho > 0$ , and a finite set $\zeta \subset \mathbb { R } ^ { d }$ satisfying + +$$ +\mathbb { P } _ { \mathcal { D } } \left[ \bigcup _ { \mathbf { s } \in \zeta } \mathcal { B } _ { \rho } ^ { p } \left( \mathbf { s } \right) \right] \geq c _ { 1 } \quad a n d \quad \forall \mathbf { s } \in \zeta , \mathbb { P } _ { \mathcal { D } } \left[ \mathcal { B } _ { \rho } ^ { p } \left( \mathbf { s } \right) \right] \geq \frac { c _ { 2 } } { | \zeta | } +$$ + +1Throughout, we will mostly use the (most commonly used) $\ell _ { \infty }$ norm, but the results hold for other norms. + +![](images/e5b88231f2d0e20df33064e3e41175c86f1f5b087d9df849c184712d5399ad8e.jpg) +Figure 2: Adversarial Error increases with increasing label noise $\eta$ . Shaded region indicates $9 5 \%$ confidence interval. Absence of shaded region indicates that it is invisible due to low variance. + +where $B _ { \rho } ^ { p }$ (s) represents a $\ell _ { p }$ -ball of radius $\rho$ around s. Further, suppose that each of these balls contain points from a single class i.e. for all s $\in \zeta ,$ , for all $\mathbf { x } , \mathbf { z } \in B _ { \rho } ^ { p } \left( \mathbf { s } \right) : c \left( \mathbf { x } \right) = c \left( \mathbf { z } \right)$ . + +Let $S _ { m }$ be a dataset of m i.i.d. samples drawn from $\mathcal { D }$ , which subsequently has each label flipped independently with probability $\eta$ . For any classifier $f$ that perfectly fits the training data $S _ { m }$ i.e. $\forall \ \mathbf { x } , y \in { \mathcal { S } } _ { m } , f \left( \mathbf { x } \right) = y , \forall \delta \ \geq$ $\forall \delta \ : > \ : 0$ and $\begin{array} { r } { m \geq \frac { | \zeta | } { \eta c _ { 2 } } \log \left( \frac { | \zeta | } { \delta } \right) } \end{array}$ , with probability at least $1 - \delta$ $\mathcal { R } _ { \mathrm { A d v } , 2 \rho } ( f ; \mathcal { D } ) \geq c _ { 1 }$ . + +The goal is to find a relatively small set $\zeta$ that satisfies the condition as this will mean that even for modest sample sizes, the trained models have significant adversarial error. We remark that it is easy to construct concrete instantiations of problems that satisfy the conditions of the theorem, e.g. each class represented by a spherical (truncated) Gaussian with radius $\rho$ , with the classes being well-separated satisfies Eq. (3). The main idea of the proof is that there is sufficient probability mass for points which are within distance $2 \rho$ of a training datum that was mislabelled. We note that the generality of the result, namely that any classifier (including neural networks) that fits the training data must be vulnerable irrespective of its structure, requires a result like Theorem 1. For instance, one could construct the classifier $h$ , where $h ( \mathbf { x } ) = c ( \mathbf { x } )$ , if $( \mathbf { x } , b ) \notin \mathcal { S } _ { m }$ for $b = 0 , 1$ , and $h ( \mathbf { x } ) = y$ if $( \mathbf { x } , y ) \in S _ { m }$ . Note that the classifier $h$ agrees with the target $c$ on every point of $\mathbb { R } ^ { d }$ except the mislabelled training examples, and as a result these examples are the only source of vulnerability. The complete proof is presented in Appendix B.1. + +There are a few things to note about Theorem 1. First, the lower bound on adversarial error applies to any classifier $f$ that fits the training data $S _ { m }$ perfectly and is agnostic to the type of model $f$ is. Second, for a given $c _ { 1 }$ , there maybe multiple $\zeta \mathbf { s }$ that satisfy the bounds in (3) and the adversarial risk holds for all of them. Thus, smaller the value of $| \zeta |$ the smaller the size of the training data it needs to fit and it can be done by simpler classifiers. Third, if the distribution of the data is such that it is concentrated around some points then for a fixed $c _ { 1 } , c _ { 2 }$ , a smaller value of $\rho$ would be required to satisfy (3) and thus a weaker adversary (smaller perturbation budget $2 \rho$ ) can cause a much larger adversarial error. + +In practice, classifiers exhibit much greater vulnerability than purely arising from the presence of memorized noisy data. Experiments in Section 3.1 show how label noise causes vulnerability in a toy MNIST model, the full MNIST and CIFAR10 for a variety of architectures. + +# 3 EXPERIMENTS ON OVERFITTING LABEL NOISE + +In Section 2, we provided theoretical settings to highlight how fitting label noise hurts adversarial robustness. In this section, we provide empirical evidence on synthetic data inspired by the theory and on the standard datasets: MNIST (LeCun et al., 1998), CIFAR10 (Krizhevsky & Hinton, 2009), + +![](images/ae72c7f2c9f19bf78d052926035c16e228903b1990635e7e3f7530adb693c561.jpg) +Figure 3: Two dimensional PCA projections of the original correctly labelled (blue and orange), original mis-labelled (green and red), and adversarial examples (purple and brown) at different stages of training. The correct label for True $O$ (blue), Noisy $O$ (green), Adv $O$ (purple $+$ ) are the same i.e. 0 and similar for the other class. + +and on a lesser scale Imagenet to support the theory. Further details about the experimental settings including model architectures are in Appendix D. + +# 3.1 OVERFITTING LABEL NOISE DECREASES ADVERSARIAL ACCURACY + +We design a simple binary classification problem, toy-MNIST, and show that when fitting a complex classifier on a training dataset with label noise, adversarial vulnerability increases with the amount of label noise, and that this vulnerability is caused by the label noise. The problem is constructed by selecting two random images from MNIST: one $\mathbf { \vec { \Delta } } ^ { 6 } 0 ^ { 9 }$ and one “1”. Each training/test example is generated by selecting one of these images and adding i.i.d. Gaussian noise sampled from ${ \mathcal { N } } \left( 0 , \sigma ^ { 2 } \right)$ We create a training dataset of 4000 samples by sampling uniformly from either class. Finally, $\eta$ fraction of the training data is chosen randomly and its labels are flipped. We train a neural network with four fully connected layers followed by a softmax layer and minimize the cross-entropy loss using an SGD optimizer until the training error becomes zero. Then, we attack this network with a strong $\ell _ { \infty }$ PGD adversary (Madry et al., 2018) with $\begin{array} { r } { \epsilon = \frac { 6 4 } { 2 5 5 } } \end{array}$ for 400 steps with a step size of 0.01. + +In Figure 2a, we plot the adversarial error, test error and training error as the amount of label noise $( \eta )$ varies, for three different values of sample variance $( \sigma ^ { 2 } )$ . For low values of $\sigma ^ { 2 }$ $( \sigma ^ { 2 } = 0 . 1 )$ ), the training data from each class is all concentrated around the same point; as a result these models are unable to memorize the label noise and the training error is high. In this case, over-fitting label noise is impossible and the test error, as well as the adversarial error, is low. However, as $\bar { \sigma } ^ { 2 }$ increases to $\sigma ^ { 2 } = 0 . 5$ , the neural network is flexible enough to use the “noise component” to extract features that allow it to memorize label noise and fit the training data perfectly. This brings the training error down to zero, while causing the test error to increase, and the adversarial error even more so. This is in line with Theorem 1. + +Remark 1. The case when $\sigma ^ { 2 } = 0 . 3$ is particularly interesting; when the label noise is low and the training error is high, there is no overfitting and the test error and the adversarial error is zero. When the network starts memorizing label noise (i.e. train error gets lesser than label noise), test error still remains very low but adversarial error increases rapidly. + +We perform a similar experiment on the full MNIST dataset trained on a 4-layered Convolutional Neural Network. For varying values of $\eta$ , for a uniformly randomly chosen $\eta$ fraction of the training data we assigned the class label randomly. We compute the natural test accuracy and the adversarial test accuracy for when the network is attacked with a $\ell _ { \infty }$ bounded PGD adversary for varying perturbation budget $\epsilon$ , with a step size of 0.01 and for 20 steps and plot the results in Figure 2b. We repeat the same experiment for CIFAR10 with a DenseNet121 (Huang et al., 2017), ResNet18 (He et al., 2016), and VGG19 (Simonyan & Zisserman, 2014) to test the phenomenon across multiple state of the art architectures and plot the results in Figure 2c to 2e. The results on both datasets show that the effect of over-fitting label noise on adversarial error is even more clearly visible here; for the same PGD adversary the adversarial error jumps sharply with increasing label noise, while the growth of natural test error is much slower. This confirms the hypothesis that benign overfitting may not be so benign when it comes to adversarial error. + +![](images/0b6cf6096bcf0bd05b1d3e2b1c94e048a25726528211b6732960fa92c165f1f1.jpg) +Figure 4: Each pair is a training (left) and test (right) image mis-classified by the adversarially trained model. They were both correctly classified by the naturally-trained model. + +For the toy-MNIST problem, we plot a 2-d projection (using PCA) of the learned representations (activations before the last layer) at various stages of training in Figure 3. (We remark that the simplicity of the data model ensures that even a 1-d PCA projection suffices to perfectly separate the classes when there is no label noise; however, the representations learned by a neural network in the presence of noise maybe very different!) We highlight two key observations: (i) The bulk of adversarial examples $( \sp { 6 6 } + \sp { 7 3 } - \mathsf { e s } )$ are concentrated around the mis-labelled training data (“◦”-es) of the opposite class. For example, the purple $^ +$ -es (Adversarially perturbed: True: 0, Pred:1 ) are very close to the green ◦-es (Mislabelled: True:0, Pred: 1). This provides empirical validation for the hypothesis that if there is a mis-labelled data-point in the vicinity that has been fit by the model, an adversarial example is created by moving towards that data point as predicted by Theorem 1. (ii) The mis-labelled training data take longer to be fit by the classifier. For example by iteration 20, the network actually learns a fairly good representation and classification boundary that correctly fits the clean training data (but not the noisy training data). At this stage, the number of adversarial examples are much lower as compared to Iteration 160, by which point the network has completely fit the noisy training data. Thus early stopping helps in avoiding memorizing the label noise, and consequently also reduces adversarial vulnerability. Early stopping has indeed been used as a defence in quite a few recent papers in context of adversarial robustness (Wong et al., 2020; Hendrycks et al., 2019a), as well as learning in the presence of label-noise (Li et al., 2019b). Our work provides an explanation regarding why early stopping may reduce adversarial vulnerability by avoiding fitting noisy training data. + +# 3.2 ROBUST TRAINING AVOIDS MEMORIZATION OF LABEL NOISE AND ATYPICAL EXAMPLES + +Robust training methods like AT (Madry et al., 2018) and TRADES (Zhang et al., 2019) are commonly used techniques to increase adversarial robustness of deep neural networks. However, it has been pointed out that this comes at a cost to clean accuracy (Raghunathan et al., 2019; Tsipras et al., 2019). When trained with these methods, both the training and test accuracy (on clean data) for commonly used deep learning models drops with increasing strength of the PGD adversary used (see Table 1). In this section, we provide evidence to show that robust training avoids memorization of label noise and this also results in the drop of clean train and test accuracy. + +Robust training ignores label noise Figure 1 shows that label noise is not uncommon in standard datasets like MNIST and CIFAR10. In fact, upon closely monitoring the mis-classified training set examples for both AT and TRADES, we found that neither predicts correctly on the training set labels for any of the examples identified in Figure 1, all examples that have a wrong label in the training set, whereas natural training does. Thus, in line with Theorem 1, robust training methods ignore fitting noisy labels. + +(a) Fraction of train points that have a self-influence greater than $s$ is plotted versus $s$ . + +![](images/9b62541402929cdc78f4f52ebd2ccc36442dac1ac3e15aedea512bb9f9ee9bf4.jpg) +(b) Distribution of the influence of training point on all test points compared to the distribution of influence on test points mis-classified by adversarially trained points. + +![](images/ac0b640ea7d08db7a8a7868a851315226466e9abc8d2fcd7cd260905b49aec38.jpg) +Figure 5: The blue represents the points mis-classified by an adversarially trained model. The orange represents the distribution for all points in the dataset (of the concerned class for CIFAR10). + +We also observe this in a synthetic experiment on the full MNIST dataset where we assigned random labels to $15 \%$ of the dataset. A naturally trained CNN model achieved $1 0 0 \%$ accuracy on this dataset whereas an adversarially trained model (standard setting with $\epsilon = 0 . 3$ for 30 steps) mis-classified 997 examples in the training set after the same training regime. Out of these 997 samples, 994 examples were mislabelled in the dataset. + +Robust training ignores rare examples Certain examples in the training set belong to rare subpopulations (eg. a special kind of cat) and this sub-population is sufficiently distinct from the rest of the examples of that class in the training dataset (other cats in the dataset). Next, we show that though ignoring rare samples helps in adversarial robustness, it hurts the natural test accuracy. Our hypothesis is that one of the effects of robust training is to not memorize rare examples, which would otherwise be memorized by a naturally trained model. As Feldman (2019) points out, if these subpopulations are very infrequent in the training dataset, they are indistinguishable from data-points with label noise with the difference being that examples from that sub-population are also present in the test-set. Natural training by memorizing those rare training examples reduces the test error on the corresponding test examples. Robust training, by not memorizing these rare samples (and label noise), achieves better robustness but sacrifices the test accuracy on the test examples corresponding to those training points. + +Experiments on MNIST, CIFAR10, and ImageNet We visually demonstrate this effect in Figure 4 with examples from CIFAR10, MNIST, and ImageNet and then provide more statistical evidence using the notions of memorization score and influence (Zhang & Feldman, 2020) in Figure 5. Each pair of images contains a mis-classified (by robustly trained models) test image and the mis-classified training image “responsible” for it (see Appendix D.2 for details on how they were found and further details on memorization and influence.). Importantly both of these images were correctly classified by a naturally trained model. Visually, it is evident that the training images are extremely similar to the corresponding test image. Inspecting the rest of the training set, they are also very different from other images in the training set. We can thus refer to these as rare sub-populations. + +The notion that certain test examples were not classified correctly due to a particular training examples not being classified correctly is measured by the influence a training image has on the test image (c.f. defn 3 in Zhang & Feldman (2020)). We obtained the influence of each training image on each test image for that class from Zhang & Feldman (2020) and the training images in Figure 4 has a disproportionately higher influence on the corresponding test image compared to influences of other train-test image pairs in CIFAR10. A precise notion of measuring if a sample is rare is through the concept of self-influence or memorization. Self-influence for a rare example, that is unlike other examples of that class, will be high as the rest of the dataset will not provide relevant information that will help the model in correctly predicting on that particular example. + +In Figure 5a, we show that the self-influence of training samples that were mis-classified by adversarially trained models but correctly classified by a naturally trained model is higher compared to the distribution of self-influence on the entire train dataset. In other words, it means that the self-influence of the training examples mis-classified by the robustly trained models is larger than the average self-influence of (all) examples belonging to that class. This supports our hypothesis that adversarial training excludes fitting these rare (or ones that need to be memorized) samples. In Figure 5b, we show that the influence of training images are higher on test images that are mis-classified by adversarially trained models as compared to an average test image from the dataset. In other words, this means that adversarially trained models mis-classify test examples that are heavily influenced by some particular training example. As we saw in Figure 5a, AT models do not memorize atypical train examples; consequently they misclassify test examples that are heavily influenced by those atypical train examples (visualized in Figure 4). This confirms our hypothesis that the loss in test accuracy of robustly trained models are due to test images that are rare and thus has a particularly high influence from a training image. + +# 4 REPRESENTATION LEARNING AND ROBUSTNESS + +Label noise by itself is not the sole cause for adversarial vulnerability especially in deep learning models trained with standard optimization procedures like SGD. A second cause is the choice of representation of the data, which in turn affects the shape of the decision boundary. The choice of model affects representations and introduces desirable and possibly even undesirable (cf. (Liu et al., 2018)) invariances; for example, training convolutional networks are invariant to (some) translations, while training fully connected networks are invariant to permutations of input features. This means that fully connected networks can learn even if the pixels of each training image in the training set are permuted with a fixed permutation (Zhang et al., 2016). This invariance is worrying as it means that such a network can effectively classify a tensor that is visually nothing like a real image into an image category. While CNNs don’t have this particular invariance, as Liu et al. (2018) shows, CNNs are unable to predict where in the image a particular object is. + +In Theorem 2, we show that for one (”correct”) choice of representation, it will be impossible to fit the training data perfectly in the presence of label noise, but the classifier that best fits the training data, in that restricted class of classifiers,2 will have good test accuracy and adversarial accuracy. On the other hand, when a different (“incorrect”) representation is used, we show that it is possible to find a classifier that has no training error, has good test accuracy, but has high adversarial error. We posit this as an (partial) explanation of why classifiers trained on real data (with label noise, or at least atypical examples) have good test accuracy, while still being vulnerable to adversarial attacks. + +Theorem 2. For any $n \in \mathbb { Z } _ { + }$ , there exists a family of distributions $\mathcal { D } ^ { n }$ over $\mathbb { R } \times \{ 0 , 1 \}$ and function classes $\mathcal { C } , \mathcal { H }$ , such that for any $\mathcal { P }$ from $\mathcal { D } ^ { n }$ , and for any $0 < \gamma < 1 / 4$ , and $\eta \in \left( 0 , 1 / 2 \right) i f$ ${ \cal { S } } _ { m } = \{ ( { \bf { x } } _ { i } , y _ { i } ) \} _ { i = 1 } ^ { m }$ denotes a sample of size $m$ drawn from $\mathcal { P }$ where + +$$ +m = O \left( \operatorname* { m a x } \left\{ n \log \frac { n } { \delta } \left( \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } + 1 \right) , \frac { n } { \eta \gamma ^ { 2 } } \log \left( \frac { n } { \gamma \delta } \right) \right\} \right) +$$ + +and if $\mathcal { S } _ { m , \eta }$ denotes the sample where each label is flipped independently with probability $\eta$ + +(i) the classifier $c \in \mathcal { C }$ that minimizes the training error on $\begin{array} { r } { { \cal { S } } _ { m , \eta } , } \end{array}$ has $\mathcal { R } ( c ; \mathcal { P } ) ~ = ~ 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( c ; \mathcal { P } ) = 0$ for $0 \leq \gamma < 1 / 4$ . + +(ii) there exist $h \in \mathcal { H }$ , $h$ has zero training error on $\mathcal { S } _ { m , \eta }$ , and $\mathcal { R } ( h ; \mathcal { P } ) = 0 .$ . However, for any $\gamma > 0$ , and for any $h \in \mathcal H$ with zero training error on $S _ { m , \eta } , \mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { P } ) \geq 0 . 1$ . + +Furthermore, the required $ { \mathcal { C } } _ { \mathbf { { \mathcal { C } } } } \in { \mathcal { C } }$ and $ { \mathcal { h } } _ { \mathbf { \Phi } } \in { \mathcal { H } }$ above can be computed in $\begin{array} { r } { O \left( \mathrm { p o l y } \left( n \right) , \mathrm { p o l y } \left( \frac { 1 } { \frac { 1 } { 2 } - \eta } \right) , \mathrm { p o l y } \left( \frac { 1 } { \delta } \right) \right) t i n } \end{array}$ e. + +In Theorem 3, we show a similar result without the effect of label noise. In Appendix C.3, we provide experimental results learning more meaningful representations by training on more fine-grained labels (instead of the relevant coarse labels directly) can improve adversarial robustness. + +# 5 RELATED WORK + +Montasser et al. (2019) established that there are concept classes with finite VC dimensions i.e. are properly PAC-learnable but are only improperly robustly PAC learnable. This implies that to learn the problem with small adversarial error, a different class of models (or representations) needs to be used whereas for small natural test risk, the original model class (or representation) can be used. Recent empirical works have also shown evidence towards this (eg. (Sanyal et al., 2020a)). In particular, the examples from Montasser et al. (2019) that uses improper learning to learn a robust classifier has a much higher sample complexity. In our example, learning algorithms for both the hypotheses classes that we use have polynomial sample complexity. Another point of distinction is that Theorem 2 uses a training set induced with random classification noise and hypothesis class $\mathcal { H }$ obtains zero training on this noisy training set whereas the examples in Montasser et al. (2019) do not have any label noise. + +Hanin & Rolnick (2019) have shown that though the number of possible linear regions that can be created by a deep ReLU network is exponential in depth, in practice for networks trained with SGD this tends to grow only linearly thus creating much simpler decision boundaries than is possible due to sheer expresssivity of deep networks. Experiments on the data models from our theoretical settings indeed show that adversarial training indeed produces more “complex” decision boundaries + +Jacobsen et al. (2019) have discussed that excessive invariance in neural networks might increase adversarial error. However, their argument is that excessive invariance can allow sufficient changes in the semantically important features without changing the network’s prediction. They describe this as Invariance based adversarial examples as opposed to perturbation based adversarial examples. We show that excessive (incorrect) invariance might also result in perturbation based adversarial examples. + +Another contemporary work (Geirhos et al.) discusses a phenomenon they refer to as Shortcut Learning where deep learning models perform very well on standard tasks like reducing classification error but fail to perform in more difficult real world situations. We discuss this in the context of models that have small test error but large adversarial error and provide and theoretical and empirical to discuss why one of the reasons for this is sub-optimal representation learning. + +# 6 CONCLUSION + +Recent research has largely shone a positive light on interpolation (zero training error) by highly over-parameterized models even in the presence of label noise. While overfitting noisy data may not harm generalisation, we have shown that this can be severely detrimental to robustness. This raises a new security threat where label noise can be inserted into datasets to make the models learnt from them vulnerable to adversarial attacks without hurting their test accuracy. As a result, further research into learning without memorization is ever more important (Sanyal et al., 2020b; Shen & Sanghavi, 2019). Further, we underscore the importance of proper representation learning in regards to adversarial robustness. Representations learnt by deep networks often encode a lot of different invariances, e.g., location, permutation, rotation, etc. While some of them are useful for the particular task at hand, we highlight that certain invariances can increase adversarial vulnerability. Thus we believe that making significant progress towards training robust models with good test error requires us to rethink representation learning and closely examine the data on which we are training these models. + +# 7 ACKNOWLEDGEMENT + +We thank Vitaly Feldman and Chiyuan Zhang for providing us with data that helped to significantly speed up some parts of this work. We also thank Nicholas Lord for feedback on the draft. AS acknowledges support from The Alan Turing Institute under the Turing Doctoral Studentship grant TU/C/000023. VK is supported in part by the Alan Turing Institute under the EPSRC grant EP/N510129/1. PHS and PD acknowledges support from the Royal Academy of Engineering under the Research Chair and Senior Research Fellowships scheme, EPSRC/MURI grant EP/N019474/1 and FiveAI. + +# REFERENCES + +Anish Athalye, Nicholas Carlini, and David Wagner. Obfuscated gradients give a false sense of security: Circumventing defenses to adversarial examples. 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Understanding deep learning requires rethinking generalization. International Conference on Learning Representations (ICLR), nov 2016. URL http://arxiv.org/abs/1611.03530. + +Hongyang Zhang, Yaodong Yu, Jiantao Jiao, Eric P. Xing, Laurent El Ghaoui, and Michael I. Jordan. Theoretically principled trade-off between robustness and accuracy. In Kamalika Chaudhuri and Ruslan Salakhutdinov (eds.), Proceedings of the 36th International Conference on Machine Learning, ICML 2019, 9-15 June 2019, Long Beach, California, USA, volume 97 of Proceedings of Machine Learning Research, pp. 7472–7482. PMLR, 2019. URL http://proceedings. mlr.press/v97/zhang19p.html. + +![](images/9cfb84e58cbe4f745edc06b542632685f12c04eff80e9214242c60291905b456.jpg) + +(a) Both Parity and Union of Interval classifier predicts red if inside any green interval and blue if outside all intervals. The $\times$ -es are correctly labelled and the ◦-es are mis-labelled points. Reference integer points on the line labelled in binary. + +![](images/84667bc87e72097786748baad81117bac2470f551698b478c0d1cf05483a8c0d.jpg) +(b) Robust generalization needs more complex boundaries + +Figure 6: Visualization of the distribution and classifiers used in the Proof of Theorem 2 and 3. The Red and Blue indicate the two classes. + +# A REPRESENTATION LEARNING AND ADVERSARIAL ROBUSTNESS + +In this section we present another result to show that there exists a data distribution where proper representation is necessary even in the absence of label noise for small adversarial error as well as small test error whereas another representation can provide low test error but necessarily have large adversarial error. Interestingly, the representation that can achieve small adversarial error can look visually more complex due to larger number of distinct linear regions in its decision boundary. However, statistically it will have a smaller VC dimension than its counterpart. + +We first present the theorems with a proof sketch for ease of understanding and the more detailed proofs in Appendix B. + +Theorem 3. For some universal constant $c ,$ and any $0 < \gamma _ { 0 } < 1 / \sqrt { 2 }$ , there exists a family of distributions $\mathcal { D }$ defined on $\mathcal { X } \times \{ 0 , 1 \}$ where $\mathcal { X } \subseteq \mathbb { R } ^ { 2 }$ such that for all distributions $\mathcal { P } \in \mathcal { D }$ , and denoting by ${ { \cal { S } } _ { m } } = \left\{ \left( { \bf { x } } _ { 1 } , y _ { 1 } \right) , \cdot \cdot \cdot , \left( { \bf { x } } _ { m } , y _ { m } \right) \right\}$ a sample of size m drawn i.i.d. from $\mathcal { P }$ , + +(i) For any $m \geq 0$ , $S _ { m }$ is linearly separable i.e., $\forall ( \mathbf { x } _ { i } , y _ { i } ) \in S _ { m }$ , there exist $\mathbf { w } \in \mathbb { R } ^ { 2 } , w _ { 0 } \in \mathbb { R }$ s.t. $y _ { i } \left( \mathbf { w } ^ { \top } \mathbf { x } _ { i } + w _ { 0 } \right) \geq 0 .$ . Furthermore, for every $\gamma > \gamma _ { 0 }$ , any linear separator $f$ that perfectly fits the training data $S _ { m }$ has $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { P } ) \ge 0 . 0 0 0 5 ,$ , even though $\mathcal { R } ( f ; \mathcal { P } ) 0$ as $m \infty$ . + +(ii) There exists a function class $\mathcal { H }$ such that for some $m \in O ( \log ( \delta ^ { - 1 } ) )$ , any $h \in \mathcal H$ that perfectly fits the $S _ { m }$ , satisfies with probability at least $1 - \delta$ , $\mathcal { R } ( h ; \mathcal { P } ) = 0$ and $\begin{array} { r } { \mathcal { R } _ { \operatorname { A d v } , \gamma } ( h ; \mathcal { P } ) = 0 , } \end{array}$ , for any $\gamma \in [ 0 , \gamma _ { 0 } + 1 / 8 ]$ . + +A complete proof of this result appears in Appendix B.2, but first, we provide a sketch of the key idea√ here.The distributions in family $\mathcal { D }$ will be supported on balls of radius at most $1 / \sqrt { 2 }$ on the integer lattice in $\mathbb { R } ^ { 2 }$ . The true class label for any point $\mathbf { x }$ is provided by the parity of $a + b$ , where $( a , b )$ is the lattice point closest to $\mathbf { x }$ . However, the distributions in $\mathcal { D }$ are chosen to be such that there is also a linear classifier that can separate these classes, e.g. a distribution only supported on balls centered at the points $( a , a )$ and $( a , a + 1 )$ for some integer $a$ (See Figure 6b). Visually learning the classification problem using the parity of $a + b$ results in a seemingly more complex decision boundary, a point that has been made earlier regarding the need for more complex boundaries to achieve adversarial robustness (Nakkiran, 2019; Degwekar et al., 2019). However, it is worth noting that this complexity is not rooted in any statistical theory, e.g. the VC dimension of the classes considered in Theorem 3 is essentially the same (even lower for $\mathcal { H }$ by 1). This visual complexity arises purely due to the fact that the linear classifier looks at a geometric representation of the data whereas the parity classifier looks at the binary representation of the sum of the nearest integer of the coordinates. In the case of neural networks, recent works (Kamath et al., 2020) have indeed provided empirical results to support that excessive invariance (eg. rotation invariance) increases adversarial error. + +REPRESENTATION LEARNING IN THE PRESENCE OF LABEL NOISE + +Here we restate Theorem 2 and present a proof sketch for the result. + +Theorem 2. For any $n \in \mathbb { Z } _ { + }$ , there exists a family of distributions $\mathcal { D } ^ { n }$ over $\mathbb { R } \times \{ 0 , 1 \}$ and function classes $\mathcal { C } , \mathcal { H }$ , such that for any $\mathcal { P }$ from $\mathcal { D } ^ { n }$ , and for any $0 < \gamma < 1 / 4$ , and $\eta \in \left( 0 , 1 / 2 \right) i f$ ${ \cal { S } } _ { m } = \{ ( { \bf { x } } _ { i } , y _ { i } ) \} _ { i = 1 } ^ { m }$ denotes a sample of size m drawn from $\mathcal { P }$ where + +$$ +m = O \left( \operatorname* { m a x } \left\{ n \log \frac { n } { \delta } \left( \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } + 1 \right) , \frac { n } { \eta \gamma ^ { 2 } } \log \left( \frac { n } { \gamma \delta } \right) \right\} \right) +$$ + +and if $\mathcal { S } _ { m , \eta }$ denotes the sample where each label is flipped independently with probability $\eta$ $( i )$ the classifier $c \in \mathcal { C }$ that minimizes the training error on $\begin{array} { r } { { \cal { S } } _ { m , \eta } , } \end{array}$ , has $\mathcal { R } ( c ; \mathcal { P } ) ~ = ~ 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( c ; \mathcal { P } ) = 0$ for $0 \leq \gamma < 1 / 4$ . + +(ii) there exist $h \in \mathcal { H }$ , h has zero training error on $\mathcal { S } _ { m , \eta }$ , and $\mathcal { R } ( h ; \mathcal { P } ) = 0$ . However, for any $\gamma > 0$ and for any $h \in \mathcal H$ with zero training error on $S _ { m , \eta } , \mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { P } ) \geq 0 . 1$ . + +Furthermore, the required $ { \mathcal { C } } _ { \mathbf { { \mathcal { C } } } } \in { \mathcal { C } }$ and $ { \mathcal { h } } _ { \mathbf { \Phi } } \in { \mathcal { H } }$ above can be computed in $\begin{array} { r } { O \left( \mathrm { p o l y } \left( n \right) , \mathrm { p o l y } \left( \frac { 1 } { \frac { 1 } { 2 } - \eta } \right) , \mathrm { p o l y } \left( \frac { 1 } { \delta } \right) \right) t i m e } \end{array}$ . + +We sketch the proof here and present the complete the proof in Appendix B.3; as in Appendix A we will make use of parity functions, though the key point is the representations used. Let $\mathcal { X } = [ 0 , N ]$ , where $N = 2 ^ { n }$ , we consider distributions that are supported on intervals $( i - 1 / 4 , i + 1 / \bar { 4 } )$ for $i \in \{ 1 , \ldots , N - 1 \}$ (See Figure 6a), but any such distribution will only have a small number, $O ( n )$ , intervals on which it is supported. The true class label is given by a function that depends on the parity of some hidden subsets $S$ of bits in the bit-representation of the closest integer $i$ , e.g. as in Figure 6a if $S = \{ 0 , 2 \}$ , then only the least significant and the third least significant bit of $i$ are examined and the class label is 1 if an odd number of them are 1 and 0 otherwise. Despite the noise, the correct label on any interval can be guessed by using the majority vote and as a result, the correct parity learnt using Gaussian elimination. (This corresponds to the class $\mathcal { C }$ in Theorem 2.) On the other hand it is also possible to learn the function as a union of intervals, i.e. find intervals, $I _ { 1 } , I _ { 2 } , \ldots , I _ { k }$ such that any point that lies in one of these intervals is given the label 1 and any other point is given the label 0. By choosing intervals carefully, it is possible to fit all the training data, including noisy examples, but yet not compromise on test accuracy (Fig. 6a). Such a classifier, however, will be vulnerable to adversarial examples by applying Theorem 1. A classifier such as union of intervals ( $\mathcal { H }$ in Theorem 2) is translation-invariant, whereas the parity classifier is not. This suggests that using classifiers, such as neural networks, that are designed to have too many built-in invariances might hurt its robustness accuracy. + +# B PROOFS FOR SECTION 2 + +In this section, we present the formal proofs to the theorems stated in Section 2. + +# B.1 PROOF OF THEOREM 1 + +Theorem 1. Let c be the target classifier, and let $\mathcal { D }$ be a distribution over $\left( \mathbf { x } , y \right)$ , such that $y = c \left( \mathbf { x } \right)$ in its support. Using the notation $\mathbb { P } _ { \mathcal { D } } [ A ]$ to denote $\mathbb { P } _ { ( \mathbf { x } , y ) \sim \mathcal { D } } [ \mathbf { x } \in A ]$ for any measurable subset $A \subseteq \mathbb { R } ^ { d }$ , suppose that there exist $c _ { 1 } \geq c _ { 2 } > 0$ , $\rho > 0$ , and $a$ finite set $\zeta \subset \mathbb { R } ^ { d }$ satisfying + +$$ +\mathbb { P } _ { \mathcal { D } } \left[ \bigcup _ { \mathbf { s } \in \zeta } \mathcal { B } _ { \rho } ^ { p } \left( \mathbf { s } \right) \right] \geq c _ { 1 } \quad a n d \quad \forall \mathbf { s } \in \zeta , \mathbb { P } _ { \mathcal { D } } \left[ \mathcal { B } _ { \rho } ^ { p } \left( \mathbf { s } \right) \right] \geq \frac { c _ { 2 } } { | \zeta | } +$$ + +where $B _ { \rho } ^ { p }$ (s) represents a $\ell _ { p }$ -ball of radius $\rho$ around s. Further, suppose that each of these balls contain points from a single class i.e. for all $\mathbf { s } \in { \zeta } ,$ , for all $\mathbf { x } , \mathbf { z } \in B _ { \rho } ^ { p } \left( \mathbf { s } \right) : c \left( \mathbf { x } \right) = c \left( \mathbf { z } \right)$ . + +Let $S _ { m }$ be a dataset of m i.i.d. samples drawn from $\mathcal { D }$ , which subsequently has each label flipped independently with probability $\eta$ . For any classifier $f$ that perfectly fits the training data $S _ { m }$ i.e. $\forall \mathbf { x } , y \in S _ { m } , f \left( \mathbf { x } \right) = y , \forall \delta$ $\forall \delta \ : > \ : 0$ and $\begin{array} { r } { m \ge \frac { | \zeta | } { \eta c _ { 2 } } \log \left( \frac { | \zeta | } { \delta } \right) } \end{array}$ , with probability at least $1 - \delta$ $\mathcal { R } _ { \mathrm { A d v } , 2 \rho } ( f ; \mathcal { D } ) \ge c _ { 1 }$ . + +Proof of Theorem 1. From (3), for any $\zeta$ and $s \in \zeta$ , + +$$ +\mathbb { P } _ { ( \mathbf { x } , y ) \sim \mathcal { D } } \left[ \mathbf { x } \in \mathcal { B } _ { \rho } \left( s \right) \right] \geq \frac { c _ { 2 } } { | \zeta | } +$$ + +As the sampling of the point and the injection of label noise are independent events, + +$$ +\mathbb { P } _ { ( \mathbf { x } , y ) \sim \mathcal { D } } \left[ \mathbf { x } \in \mathcal { B } _ { \rho } \left( s \right) \wedge \mathbf { x } \mathrm { g e t s ~ m i s l a b e l l e d } \right] \geq \frac { c _ { 2 } \eta } { \left| \zeta \right| } +$$ + +Thus, + +$$ +\begin{array} { r l } { \mathbb { P } _ { \mathcal { S } _ { m } \sim \mathcal { D } ^ { m } } [ ] ( \mathbf { x } , y ) \in \mathcal { S } _ { m } : \mathbf { x } \in \mathcal { B } _ { \rho } ( s ) \wedge \mathbf { x } \mathrm { ~ i s ~ m i s l a b e l l e d } ] \geq 1 - ( 1 - \frac { c _ { 2 } \eta } { \vert \zeta \vert } ) ^ { m } } & { } \\ & { \geq 1 - \exp ( \frac { - c _ { 2 } \eta m } { \vert \zeta \vert } ) } \end{array} +$$ + +Substituting $\begin{array} { r } { m \geq \frac { | \zeta | } { \eta c _ { 2 } } \log \left( \frac { | \zeta | } { \delta } \right) } \end{array}$ and applying the union bound over all $s \in \zeta$ , we get + +$$ +\mathbb { P } _ { { \mathcal S } _ { m } \sim \mathcal { D } ^ { m } } \left[ \forall s \in \zeta , \ \exists \left( \mathbf { x } , y \right) \in { \mathcal S } _ { m } : \mathbf { x } \in { \mathcal { B } } _ { \rho } \left( s \right) \land \mathbf { x } \ \mathrm { i s } \ \mathrm { m i s l a b e l l e d } \right] \geq 1 - \delta +$$ + +As for all $\mathbf { s } \in \mathbb { R } ^ { d }$ and $\forall \mathbf { x } , \mathbf { z } , \in B _ { \rho } ^ { p } \left( \mathbf { s } \right) , \left\| \mathbf { x } - \mathbf { z } \right\| _ { p } \leq 2 \rho$ , we have that + +$$ +\begin{array} { r l } { \mathcal { R } _ { \mathrm { A d v } , 2 \rho } ( f ; \mathcal { D } ) = \mathbb { P } _ { S _ { n } \sim \mathcal { D } ^ { n } } \left[ \mathbb { P } _ { ( x _ { 1 } , y _ { 2 } ) \sim \mathcal { D } } \left[ \mathbb { 1 } _ { \mathbb { Z } } \in B _ { 2 \rho } \left( \mathbf { x } \right) \wedge y \neq f \left( \mathbf { z } \right) \right] \right] } & { } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \times \zeta } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ { \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } \\ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \ \end{array} +$$ + +where $c$ is the true concept for the distribution $\mathcal { D }$ . Equality (1) follows from the fact that the event $\begin{array} { r } { \mathbf { x } \in \bigcup _ { s \in \zeta } B _ { \rho } ^ { p } \left( s \right) } \end{array}$ is equivalent to the event that there exists an $i \in \{ 1 , . . , | \zeta | \}$ such that $\mathbf { x } \in B _ { \rho } ^ { p } \left( s _ { i } \right)$ . Equality (2) follows from the assumptions that each of the balls around s $\in \zeta$ are pure in their labels. Equality (3) follows from 4 by using the $\mathbf { x }$ that is guaranteed to exist in the ball around s and be mis-labelled with probability atleast $1 - \delta$ . To see how, replace the $\mathbf { x }$ in Assumption 4 with $\mathbf { z }$ . The last equality follows from the first Assumption in 3. □ + +# B.2 PROOFS OF APPENDIX A + +Theorem 3. For some universal constant $c ,$ and any $0 < \gamma _ { 0 } < 1 / \sqrt { 2 }$ , there exists a family of distributions $\mathcal { D }$ defined on $\mathcal { X } \times \{ 0 , 1 \}$ where $\mathcal { X } \subseteq \mathbb { R } ^ { 2 }$ such that for all distributions $\mathcal { P } \in \mathcal { D }$ , and denoting by ${ { \cal { S } } _ { m } } = \left\{ \left( { \bf { x } } _ { 1 } , y _ { 1 } \right) , \cdot \cdot \cdot , \left( { \bf { x } } _ { m } , y _ { m } \right) \right\}$ a sample of size $m$ drawn i.i.d. from $\mathcal { P }$ , + +(i) For any $m \geq 0$ , $S _ { m }$ is linearly separable i.e., $\forall ( \mathbf { x } _ { i } , y _ { i } ) \in S _ { m }$ , there exist $\mathbf { w } \in \mathbb { R } ^ { 2 } , w _ { 0 } \in \mathbb { R }$ s.t. $y _ { i } \left( \mathbf { w } ^ { \top } \mathbf { x } _ { i } + w _ { 0 } \right) \geq 0 .$ . Furthermore, for every $\gamma > \gamma _ { 0 }$ , any linear separator $f$ that perfectly fits the training data $S _ { m }$ has $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { P } ) \geq 0 . 0 0 0 5$ , even though $\mathcal { R } ( f ; \mathcal { P } ) 0$ as $m \infty$ . + +(ii) There exists a function class $\mathcal { H }$ such that for some $m \in O ( \log ( \delta ^ { - 1 } ) )$ , any $h \in \mathcal H$ that perfectly fits the $S _ { m }$ , satisfies with probability at least $1 - \delta$ , $\mathcal { R } ( h ; \mathcal { P } ) = 0$ and $\begin{array} { r } { \mathcal { R } _ { \operatorname { A d v } , \gamma } ( h ; \mathcal { P } ) = 0 , } \end{array}$ , for any $\gamma \in [ 0 , \gamma _ { 0 } + 1 / 8 ]$ . + +Proof of Theorem 3. We define a family of distribution $\mathcal { D }$ , such that each distribution in $\mathcal { D }$ is supported on balls of radius $r$ around $( i , i )$ and $( i + 1 , i )$ for positive integers $i$ . Either all the balls around $( i , i )$ have the labels 1 and the balls around $( i + 1 , i )$ have the label 0 or vice versa. Figure 6b shows an example where the colors indicate the label. + +Formally, for $r \ > \ 0$ , $k \in \mathbb { Z } _ { + }$ , the $( r , k )$ -1 bit parity class conditional model is defined over $( x , y ) \in \mathbf { \bar { \mathbb { R } } ^ { 2 } } \times \{ 0 , 1 \}$ as follows. First, a label $y$ is sampled uniformly from $\{ 0 , 1 \}$ , then and integer $i$ is sampled uniformly from the set $\{ 1 , \cdots , k \}$ and finally $\mathbf { x }$ is generated by sampling uniformly from the $\ell _ { 2 }$ ball of radius $r$ around $( i + y , i )$ . + +In Lemma 1 we first show that a set of $m$ points sampled iid from any distribution as defined above for $\begin{array} { r } { r < \frac { 1 } { 2 \sqrt { 2 } } } \end{array}$ is with probability 1 linear separable for any $m$ . In addition, standard VC bounds show that any linear classifier that separates $S _ { m }$ for large enough $m$ will have small test error. Lemma 1 also proves that there exists a range of $\gamma , r$ such that for any distribution defined with $r$ in that range, though it is possible to obtain a linear classifier with 0 training and test error, the minimum adversarial risk will be bounded from 0. + +However while it is possible to obtain a linear classifier with 0 test error, all such linear classifiers has a large adversarial vulnerability. In Lemma 2, we show that there exists a different representation for this problem, which also achieves zero training and test error and in addition has zero adversarial risk for a range of $r , \gamma$ where the linear classifier’s adversarial error was atleast a constant. + +Lemma 1 (Linear Classifier). There exists universal constants $\gamma _ { 0 } , \rho _ { : }$ , such that for any perturbation $\gamma > \gamma _ { 0 }$ , radius $r \geq \rho ,$ , and $k \in \mathbb { Z } _ { + }$ , the following holds. Let $\mathcal { D }$ be the family of $( r , k )$ - 1-bit parity class conditional model, $\mathcal { P } \in \mathcal { D }$ and $S _ { n } = \left\{ \left( \mathbf { x } _ { 1 } , y _ { 1 } \right) , \cdot \cdot \cdot , \left( \mathbf { x } _ { n } , y _ { 1 } \right) \right\}$ be a set of n points sampled i.i.d. from $\mathcal { P }$ . + +1) For any $n > 0$ , $S _ { n }$ is linearly separable with probability 1 i.e. there exists a $h : ( \mathbf { w } , w _ { 0 } )$ , $\mathbf { w } \in \mathbb { R } ^ { 2 } , w _ { 0 } \in \mathbb { R }$ such that the linear hyperplane $\mathbf { x } \mathbf { w } ^ { \top } \mathbf { x } + w _ { 0 }$ separates $S _ { n }$ with probability 1: + +$$ +\forall \left( \mathbf { x } , y \right) \in S _ { n } \quad z \left( \mathbf { w } ^ { \top } \mathbf { x } + w _ { 0 } \right) > 0 \quad w h e r e \ z = 2 y - 1 +$$ + +2) Further there exists an universal constant c such that for any $\epsilon , \delta > 0$ with probability $1 - \delta$ for any $S _ { n }$ with $\begin{array} { r } { n = c \frac { 1 } { \epsilon ^ { 2 } } \log \frac { 1 } { \delta } } \end{array}$ , any linear classifier $\tilde { h }$ that separates $S _ { n }$ has $\begin{array} { r } { \mathcal { R } ( \tilde { h } ; \mathcal { P } ) \leq \epsilon . } \end{array}$ . 3) Let $h : ( \mathbf { w } , w _ { 0 } )$ be any linear classifier that has $\mathcal { R } ( h ; \mathcal { P } _ { P } ) = 0$ . Then, $\mathcal { R } _ { \operatorname { A d v } , \gamma } ( h ; \mathcal { P } ) >$ 0.0005. + +We will prove the first part for any r < 12√2 by constructing a w, w0 such that it satisfies the constraints of linear separability. Let $\mathbf { w } = ( 1 , - 1 )$ , $w _ { 0 } = - 0 . 5$ . Consider any point $( \mathbf { x } , y ) \in S _ { n }$ and $z = 2 y - 1$ . Converting to the polar coordinate system there exists a $\theta \in \left[ 0 , 2 \pi \right] , j \in \left[ 0 , \cdot \cdot \cdot , k \right]$ such that $\begin{array} { r } { \mathbf { x } = \left( j + \frac { z + 1 } { 2 } + r \mathrm { c o s } \left( \theta \right) , j + r \mathrm { s i n } \left( \theta \right) \right) } \end{array}$ + +$$ +{ \begin{array} { r l r } { \left. \mathbf { w } ^ { \top } \mathbf { x } + w _ { 0 } \right. = z \left( j + { \frac { z + 1 } { 2 } } + r \cos \left( \theta \right) - j - r \sin \left( \theta \right) - 0 . 5 \right) } & { \mathbf { w } = \left( 1 , - 1 \right) ^ { \top } } \\ & { = z \left( { \frac { z } { 2 } } + 0 . 5 + r \cos \left( \theta \right) - r \sin \left( \theta \right) - 0 . 5 \right) } \\ & { = { \frac { 1 } { 2 } } + z r \left( \cos \left( \theta \right) - \sin \left( \theta \right) \right) } & { \left| \cos \left( \theta \right) - \sin \left( \theta \right) \right| < { \sqrt { 2 } } , \ z \in \cdot } \\ & { > { \frac { 1 } { 2 } } - r { \sqrt { 2 } } } \\ & { > 0 } & { r < { \frac { 1 } { 2 { \sqrt { 2 } } } } } \end{array} } +$$ + +Part 2 follows with simple VC bounds of linear classifiers. + +Let the universal constants $\gamma _ { 0 } , \rho$ be 0.02 and $\frac { 1 } { 2 \sqrt { 2 } } - 0 . 0 0 8$ respectively. Note that there is nothing special about this constants except that some constant is required to bound the adversarial risk away from 0. Now, consider a distribution $\mathcal { P }$ 1-bit parity model such that the radius of each ball is atleast $\rho$ . This is smaller than $\scriptstyle { \frac { 1 } { 2 { \sqrt { 2 } } } }$ and thus satisfies the linear separability criterion. + +Consider $h$ to be a hyper-plane that has 0 test error. Let the $\ell _ { 2 }$ radius of adversarial perturbation be $\gamma > \gamma _ { 0 }$ . The region of each circle that will be vulnerable to the attack will be a circular segment with the chord of the segment parallel to the hyper-plane. Let the minimum height of all such circular segments be $r _ { 0 }$ . Thus, $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { P } )$ is greater than the mass of the circular segment of radius $r _ { 0 }$ Let the radius of each ball in the support of $\mathcal { P }$ be $r$ . + +Using the fact that $h$ has zero test error; and thus classifies the balls in the support of $\mathcal { P }$ correctly and simple geometry + +$$ +\begin{array} { c } { { \displaystyle \frac 1 { \sqrt { 2 } } \geq r + ( \gamma - r _ { 0 } ) + r } } \\ { { { } } } \\ { { { r _ { 0 } \geq 2 r + \gamma - \displaystyle \frac 1 { \sqrt { 2 } } } } } \end{array} +$$ + +To compute $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { P } )$ we need to compute the ratio of the area of a circular segment of height $r _ { 0 }$ of a circle of radius $r$ to the area of the circle. The ratio can be written + +$$ +A \left( \frac { r _ { 0 } } { r } \right) = \frac { c o s ^ { - 1 } \left( 1 - \frac { r _ { 0 } } { r } \right) - \left( 1 - \frac { r _ { 0 } } { r } \right) \sqrt { 2 \frac { r _ { 0 } } { r } - \frac { r _ { 0 } ^ { 2 } } { { r } ^ { 2 } } } } { \pi } +$$ + +As (6) is increasing with $\textstyle { \frac { r _ { 0 } } { r } }$ , we can evaluate + +$$ +\begin{array} { l } { { \displaystyle { \frac { r _ { 0 } } { r } \geq \frac { 2 r - \frac { 1 } { \sqrt 2 } + \gamma } { r } } \qquad } } & { { \mathrm { U s i n g ~ ( 5 ) } } } \\ { { \displaystyle { \quad \geq 2 - \frac { \frac { 1 } { \sqrt 2 } - 0 . 0 2 } { r } \qquad } } } & { { \gamma > \gamma _ { 0 } = 0 . 0 2 } } \\ { { \displaystyle { \quad \geq 2 - \frac { \frac { 1 } { \sqrt 2 } - 0 . 0 2 } { \frac { 1 } { \sqrt 2 } - 0 . 0 0 8 } > 0 . 0 1 \qquad } } } & { { r > \rho = \displaystyle { \frac { 1 } { 2 \sqrt 2 } - 0 . 0 0 8 } } } \end{array} +$$ + +Substituting $\textstyle { \frac { r _ { 0 } } { r } } > 0 . 0 1$ into Eq. (6), we get that $A \left( { \frac { r _ { 0 } } { r } } \right) > 0 . 0 0 0 5$ . Thus, for all $\gamma > 0 . 0 2$ , we have $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { P } ) > 0 . 0 0 0 5$ . + +Lemma 2 (Robustness of parity classifier). There exists a concept class $\mathcal { H }$ such that for any $\gamma \in$ $\begin{array} { r } { [ \gamma _ { 0 } , \gamma _ { 0 } + \frac { 1 } { 8 } ] } \end{array}$ , $k \in \mathbb { Z } _ { + }$ , $\mathcal { P }$ being the corresponding $( \rho , k )$ $I$ -bit parity class distribution where $\rho , \gamma _ { 0 }$ are the same as in Lemma $I$ there exists $g \in { \mathcal { H } }$ such that + +$$ +\begin{array} { r } { \mathcal { R } ( g ; \mathcal { P } ) = 0 \qquad \mathcal { R } _ { \mathrm { A d v } , \gamma } ( g ; \mathcal { P } ) = 0 } \end{array} +$$ + +Proof of Lemma 2. We will again provide a proof by construction. Consider the following class of concepts $\mathcal { H }$ such that $g _ { b } \in \mathcal { H }$ is defined as + +$$ +g \left( \left( x _ { 1 } , x _ { 2 } \right) ^ { \top } \right) = { \left\{ \begin{array} { l l } { 1 } & { { \mathrm { i f } } \left[ x _ { 1 } \right] + \left[ x _ { 2 } \right] = b \left( { \bmod { 2 } } \right) } \\ { 1 - b } & { { \mathrm { 0 . w . } } } \end{array} \right. } +$$ + +where $[ x ]$ rounds $x$ to the nearest integer and $b \in \{ 0 , 1 \}$ . In Figure $^ \mathrm { 6 b }$ , the green staircase-like classifier belongs to this class. Consider the classifier $g _ { 1 }$ . Note that by construction $\mathcal { R } ( g _ { 1 } ; \mathcal { P } ) = 0$ . The decision boundary of $g _ { 1 }$ that are closest to a ball in the support of $\mathcal { P }$ centered at $( a , b )$ are the lines $x = a \pm 0 . 5$ and $y = b \pm 0 . 5$ . + +As $\gamma < \gamma _ { 0 } + \frac { 1 } { 8 }$ , the adversarial perturbation is upper bounded by $\textstyle { \frac { 1 } { 5 0 } } + { \frac { 1 } { 8 } }$ . The radius of the ball is upper bounded by $\scriptstyle { \frac { 1 } { 2 { \sqrt { 2 } } } }$ , and as we noted the center of the ball is at a distance of 0.5 from the decision boundary. If the sum of the maximum adversarial perturbation and the maximum radius of the ball is less than the minimum distance of the center of the ball from the decision boundary, then the adversarial error is 0. Substituting the values, + +$$ +\frac { 1 } { 5 0 } + \frac { 1 } { 8 } + \frac { 1 } { 2 \sqrt { 2 } } < 0 . 4 9 9 < \frac { 1 } { 2 } +$$ + +This completes the proof. + +# B.3 PROOF OF APPENDIX A + +Theorem 2. For any $n \in \mathbb { Z } _ { + }$ , there exists a family of distributions $\mathcal { D } ^ { n }$ over $\mathbb { R } \times \{ 0 , 1 \}$ and function classes $\mathcal { C } , \mathcal { H }$ , such that for any $\mathcal { P }$ from $\mathcal { D } ^ { n }$ , and for any $0 < \gamma < 1 / 4$ , and $\eta \in \left( 0 , 1 / 2 \right) i f$ ${ \cal { S } } _ { m } = \{ ( { \bf { x } } _ { i } , y _ { i } ) \} _ { i = 1 } ^ { m }$ denotes a sample of size m drawn from $\mathcal { P }$ where + +$$ +m = O \left( \operatorname* { m a x } \left\{ n \log \frac { n } { \delta } \left( \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } + 1 \right) , \frac { n } { \eta \gamma ^ { 2 } } \log \left( \frac { n } { \gamma \delta } \right) \right\} \right) +$$ + +and if $\mathcal { S } _ { m , \eta }$ denotes the sample where each label is flipped independently with probability $\eta$ + +$( i )$ the classifier $c \in \mathcal { C }$ that minimizes the training error on $\begin{array} { r } { { \cal { S } } _ { m , \eta } , } \end{array}$ , has $\mathcal { R } ( c ; \mathcal { P } ) ~ = ~ 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( c ; \mathcal { P } ) = 0$ for $0 \leq \gamma < 1 / 4$ . + +(ii) there exist $h \in \mathcal { H }$ , h has zero training error on $\mathcal { S } _ { m , \eta }$ , and $\mathcal { R } ( h ; \mathcal { P } ) = 0$ . However, for any $\gamma > 0$ , and for any $h \in \mathcal H$ with zero training error on $\mathfrak { s } _ { m , \eta } , \mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { P } ) \geq 0 . 1$ . + +Furthermore, the required $ { \mathcal { C } } _ { \mathbf { { \mathcal { C } } } } \in { \mathcal { C } }$ and $ { \mathcal { h } } _ { \mathbf { \Phi } } \in { \mathcal { H } }$ above can be computed in $\begin{array} { r } { O \left( \mathrm { p o l y } \left( n \right) , \mathrm { p o l y } \left( \frac { 1 } { \frac { 1 } { 2 } - \eta } \right) , \mathrm { p o l y } \left( \frac { 1 } { \delta } \right) \right) } \end{array}$ time. + +Proof of Theorem 2. We will provide a constructive proof to this theorem by constructing a distribution $\mathcal { D }$ , two concept classes $\mathcal { C }$ and $\mathcal { H }$ and provide the ERM algorithms to learn the concepts and then use Lemma 3 and 4 to complete the proof. + +Distribution: Consider the family of distribution $\mathcal { D } ^ { n }$ such that $\mathcal { D } _ { S , \zeta } \in \mathcal { D } ^ { n }$ is defined on $\mathcal { X } _ { \zeta } \times \{ 0 , 1 \}$ for $S \subseteq \{ 1 , \cdots , n \} , \zeta \subseteq \{ 1 , \cdots , 2 ^ { n } - 1 \}$ such that the support of $\mathcal { X } _ { \zeta }$ is a union of intervals. + +$$ +\operatorname { s u p p } \left( { \mathcal { X } } \right) _ { \zeta } = \bigcup _ { j \in \zeta } I _ { j } { \mathrm { ~ w h e r e ~ } } I _ { j } : = \left( j - { \frac { 1 } { 4 } } , j + { \frac { 1 } { 4 } } \right) +$$ + +We consider distributions with a relatively small support i.e. where $| \zeta | = O \left( n \right)$ . Each sample is defined below (9). We define the family of distributions $( \mathbf { x } , y ) \sim \mathcal { D } _ { S , \zeta }$ is created by sampling $\mathbf { x }$ uniformly from $\mathcal { X } _ { \zeta }$ $\begin{array} { r } { \mathcal { D } = \bigcup _ { n \in \mathbb { Z } _ { + } } \mathcal { D } ^ { n } } \end{array}$ and assigning $y = c _ { S } \left( \mathbf { x } \right)$ . Finally, we create where $c _ { S } \in { \mathcal { C } }$ $\mathcal { D } _ { S , \zeta } ^ { \eta }$ -a noisy version of $\mathcal { D } _ { S , \zeta }$ , by flipping $y$ in each sample $( x , y )$ with probability $\begin{array} { r } { \eta < { \frac { 1 } { 2 } } } \end{array}$ . Samples from $\mathcal { D } _ { S , \zeta }$ can be obtained using the example oracle EX $( \mathcal { D } _ { S , \zeta } )$ and samples from the noisy distribution can be obtained through the noisy oracle $\mathrm { E X } ^ { \eta } \left( \mathcal { D } _ { S , \zeta } \right)$ ) + +Concept Class $\mathcal { C }$ : We define the concept class ${ \mathcal { C } } ^ { n }$ of concepts $c _ { S } : [ 0 , 2 ^ { n } ] \to \{ 0 , 1 \}$ such that + +$$ +c _ { S } \left( \mathbf { x } \right) = \left\{ \begin{array} { l l } { 1 , } & { \mathrm { i f } \left( \langle [ \mathbf { x } ] \rangle _ { b } \mathrm { X O R } S \right) \mathrm { i s o d d } . } \\ { 0 } & { \mathrm { o . w . } } \end{array} \right. +$$ + +where $[ \cdot ] : \mathbb { R } \to \mathbb { Z }$ rounds a decimal to its nearest integer, $\langle \cdot \rangle _ { b } : \{ 0 , \cdot \cdot \cdot , 2 ^ { n } \} \{ 0 , 1 \} ^ { n }$ returns the binary encoding of the integer, and $\begin{array} { r } { ( \langle [ \mathbf { x } ] \rangle _ { b } \mathbf { X O R } \ : S ) = \sum _ { j \in S } \langle [ \dot { x } ] \rangle _ { b } \ : [ j ] } \end{array}$ mod 2. $\langle [ x ] \rangle _ { b } [ j ]$ is the $j ^ { t h }$ least significant bit in the binary encoding of the nearest integer to $\mathbf { x }$ . It is essentially the class of parity functions defined on the bits corresponding to the indices in $S$ for the binary encoding of the nearest integer to $\mathbf { x }$ . For example, as in Figure 6a if $S = \{ 0 , 2 \}$ , then only the least significant and the third least significant bit of $i$ are examined and the class label is 1 if an odd number of them are 1 and 0 otherwise. + +Concept Class $\mathcal { H }$ : Finally, we define the concept class $\textstyle { \mathcal { H } } = \bigcup _ { k = 1 } ^ { \infty } { \mathcal { H } } _ { k }$ where $\mathcal { H } _ { k }$ is the class of union of $k$ intervals on the real line $\mathcal { H } ^ { k }$ . Each concept $h _ { I } \in \mathcal { H } ^ { k }$ can be written as a set of $k$ disjoint intervals $I = \{ I _ { 1 } , \cdots , I _ { k } \}$ on the real line i.e. for $1 \le j \le k$ , $I _ { j } = [ a , b ]$ where $0 \leq a \leq b$ and + +$$ +h _ { I } \left( \mathbf { x } \right) = \left\{ \begin{array} { l l } { 1 } & { \mathrm { i f } \ \mathbf { x } \in \bigcup _ { j } I _ { j } } \\ { 0 } & { 0 . \mathrm { w } . } \end{array} \right. +$$ + +Now, we look at the algorithms to learn the concepts from $\mathcal { C }$ and $\mathcal { H }$ that minimize the train error. Both of the algorithms will use a majority vote to determine the correct (de-noised) label for each interval, which will be necessary to minimize the test error. The intuition is that if we draw a sufficiently large number of samples, then the majority of samples on each interval will have the correct label with a high probability. + +Lemma 3 proves that there ex ithm $\mathcal { A }$ such that $\mathcal { A }$ d $\begin{array} { r } { m = O \left( \left. \zeta \right. ^ { 2 } \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } \log \frac { \left. \zeta \right. } { \delta } \right) } \end{array}$ $\mathrm { E X } ^ { \eta } \left( \mathcal { D } _ { s , \zeta } \right)$ $1 - \delta$ +the randomization in the oracle, returns $f \in { \mathcal { C } }$ such that $\mathcal { R } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ for all $\begin{array} { r } { \gamma < \frac { 1 } { 4 } } \end{array}$ . As Lemma 3 states, the algorithm involves gaussian elimination over $| \zeta |$ variables and $| \zeta |$ majority votes (one in each interval) involving a total of $m$ samples. Thus the algorithm runs in $\dot { O } \left( \mathrm { p o l y } \left( m \right) + \mathrm { p o l y } \left( \left| \zeta \right| \right) \right)$ time. Replacing the complexity of $m$ and the fact that $| \zeta | = O \left( n \right)$ , the complexity of the algorithm is $\begin{array} { r } { O \left( \operatorname { p o l y } \left( n , \frac { 1 } { 1 - 2 \eta } , \frac { 1 } { \delta } \right) \right) } \end{array}$ . + +Lemma 4 proves that there exists an algorithm $\widetilde { A }$ such that $\widetilde { A }$ draws + +$$ +m > \operatorname* { m a x } \left\{ 2 \left. \zeta \right. ^ { 2 } \log \frac { 2 \left. \zeta \right. } { \delta } \left( 8 \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } + 1 \right) , \frac { 0 . 1 \left. \zeta \right. } { \eta \gamma ^ { 2 } } \log \left( \frac { 0 . 1 \left. \zeta \right. } { \gamma \delta } \right) \right\} +$$ + +samples and returns $h \in \mathcal H$ such that $h$ has 0 training error, 0 test error and an adversarial test error of atleast 0.1. We can replace $\left| \zeta \right| = O \left( n \right)$ to get the required bound on $m$ in the theorem. The algorithm to construct $h$ visits every point atmost twice - once during the construction of the intervals using majority voting, and once while accommodating for the mislabelled points. Replacing the complexity of $m$ , the complexity of the algorithm is $\begin{array} { r } { O \left( \operatorname { p o l y } \left( n , \frac { 1 } { 1 - 2 \eta } , \frac { 1 } { \gamma } , \frac { 1 } { \delta } \right) \right) ^ { - } } \end{array}$ . This completes the proof. + +Lemma 3 (Parity Concept Class). There exists a learning algorithm $\mathcal { A }$ such that given access to the noisy example oracle EXη (DS,ζ ), A makes m = O |ζ|2 (1−η)(1−2η)2 l og |ζ|δ calls to the oracle and returns a hypothesis $f \in { \mathcal { C } }$ such that with probability $1 - \delta$ , we have that $\mathcal { R } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ for all $\gamma < \frac { 1 } { 4 }$ . + +Proof. The algorithm $\mathcal { A }$ works as follows. It makes $m$ calls to the oracle $\operatorname { E X } \left( \mathcal { D } _ { s } ^ { m } \right)$ to obtain a set of points $\{ ( x _ { 1 } , y _ { 1 } ) , \cdot \cdot \cdot , ( x _ { m } , y _ { m } ) \}$ where $\begin{array} { r } { m \geq 2 \left. \zeta \right. ^ { 2 } \log \frac { 2 \left. \zeta \right. } { \delta } \left( 8 \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } + 1 \right) } \end{array}$ 8 (1−η)(1−2η)2 + 1 . Then, it replaces each $x _ { i }$ with $[ x _ { i } ]$ ([·] rounds a decimal to the nearest integer) and then removes duplicate $x _ { i } \mathbf { s }$ by preserving the most frequent label $y _ { i }$ associated with each $x _ { i }$ . For example, if $S _ { 5 } ~ = ~ \{ ( \bar { 2 } . 8 \bar { , 1 } ) , ( 2 . 9 \bar { , 0 } ) , ( 3 . 1 , 1 ) , ( 3 . \bar { 2 } , 1 ) , ( 3 . 9 , 0 ) \}$ then after this operation, we will have $\{ ( 3 , 1 ) , ( 4 , 0 ) \}$ . + +$\begin{array} { r } { m \geq 2 \left. \zeta \right. ^ { 2 } \log \frac { 2 \left. \zeta \right. } { \delta } \left( 8 \frac { ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } + 1 \right) } \end{array}$ , using $\delta _ { 2 } ~ = ~ \frac { \delta } { 2 }$ and $\begin{array} { r } { k = \frac { 8 ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } \log \frac { 2 | \zeta | } { \delta } } \end{array}$ in Lemma 5 guarantees that with probability $\textstyle 1 - { \frac { \delta } { 2 } }$ , each interval will have atleast $\begin{array} { r } { \frac { 8 ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } \log \frac { 2 | \zeta | } { \delta } } \end{array}$ samples. + +r any specific interval, using , the majority vote for the la $\begin{array} { r } { \delta _ { 1 } = \frac { 2 | \zeta | } { \delta } } \end{array}$ in Lemma 6 guarantees that with probability atleast interval will succeed in returning the de-noised label. $1 - \frac { 2 | \zeta | } { \delta }$ Applying a union bound over all $| \zeta |$ intervals, will guarantee that with probability atleast $1 - \delta$ , the majority label of every interval will be the denoised label. + +Now, the problem reduces to solving a parity problem on this reduced dataset of $| \zeta |$ points (after denoising, all points in that interval can be reduced to the integer in the interval and the denoised label). We know that there exists a polynomial algorithm using Gaussian Elimination that finds a consistent hypothesis for this problem. We have already guaranteed that there is a point in $S _ { m }$ from every interval in the support of $\mathcal { D } _ { S , \zeta }$ . Further, $f$ is consistent on $S _ { m }$ and $f$ is constant in each of these intervals by design. Thus, with probability atleast $1 - \delta$ we have that $\mathcal { R } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ . + +By construction, $f$ makes a constant prediction on each interval $\begin{array} { r l r } { { \big ( j - \frac { 1 } { 2 } , j + \frac { 1 } { 2 } \big ) } } \end{array}$ for all $j \in \zeta$ . Thus, for any perturbation radius $\begin{array} { r } { \gamma < \frac { 1 } { 4 } } \end{array}$ the adversarial risk $\mathcal { R } _ { \mathrm { A d v } , \mathcal { D } _ { S , \prime \zeta } } ( f ) = 0$ . Combining everything, we have shown that there is an algorithm that makes $\begin{array} { r } { 2 \left. \zeta \right. ^ { 2 } \log \frac { 2 \lvert \zeta \rvert } { \delta } \left( 8 \frac { ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } + 1 \right) } \end{array}$ calls to the $\mathrm { E X } \left( \mathcal { D } _ { S , \zeta } ^ { \eta } \right)$ oracle, runs in time polynomial in $\begin{array} { r } { \left| \zeta \right| , \frac { 1 } { 1 - 2 \eta } } \end{array}$ , $\frac { 1 } { \delta }$ to return $f \in { \mathcal { C } }$ such that $\mathcal { R } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { D } _ { S , \zeta } ) = 0$ for $\gamma < \frac { 1 } { 4 }$ . □ access to a noisy example oracle makes Lemma 4 (Union of Interval Concept Class). There exists a learning algorithm $\begin{array} { r } { m = O \left( \left. \zeta \right. ^ { 2 } \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } \log \frac { \left. \zeta \right. } { \delta } \right) } \end{array}$ ecalls to the oracle and returns $\widetilde { A }$ such that given a hypothesis such that training error is 0 and with probability , . + +Further for any $h \in \mathcal H$ that has zero training error on $m ^ { \prime }$ samples drawn from $\mathrm { E X } ^ { \eta } \left( \mathcal { D } _ { S , \zeta } \right)$ for $\begin{array} { r } { m ^ { \prime } > \frac { | \zeta | } { 1 0 \eta \gamma ^ { 2 } } \log \frac { | \zeta | } { 1 0 \gamma \delta } } \end{array}$ and $\eta \in \left( 0 , \frac { 1 } { 2 } \right)$ then $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( f ; \mathcal { D } _ { S , \zeta } ) \geq 0 . 1$ for all $\gamma > 0$ . + +Proof of Lemma 4. The first part of the algorithm works similarly to Lemma 3. The algorithm $\widetilde { A }$ makes $m$ calls to the oracle EX $( \mathcal { D } _ { s } ^ { m } )$ to obtain a set of points ${ \cal { S } } _ { m } = \left\{ \left( x _ { 1 } , y _ { 1 } \right) , \cdot \cdot \cdot , \left( x _ { m } , y _ { m } \right) \right\}$ where $\begin{array} { r } { m \geq 2 \left| \zeta \right| ^ { 2 } \log \frac { 2 | \zeta | } { \delta } \left( 8 \frac { ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } + 1 \right) } \end{array}$ . $\widetilde { A }$ computes $h \in \mathcal H$ as follows. To begin, let the list of intervals in $h$ be $I$ and $\mathcal { M } _ { z } = \{ \}$ Then do the following for every $( x , y ) \in S _ { m }$ . + +1. let $z : = [ x ]$ , +2. Let $\mathcal { N } _ { z } \subseteq { S } _ { m }$ be the set of all $( x , y ) \in S _ { m }$ such that $| x - z | < 0 . 5$ . +3. Compute the majority label $\tilde { y }$ of $\mathcal { N } _ { z }$ . +4. Add all $( x , y ) \in \mathcal { N } _ { z }$ such that $y \ne \tilde { y }$ to $\mathcal { M } _ { z }$ +5. If $\tilde { y } = 1$ , then add the interval $( z - 0 . 5 , z + 0 . 5 )$ to $I$ . +6. Remove all elements of $\mathcal { N } _ { z }$ from $S _ { m }$ i.e. $\begin{array} { r } { S _ { m } : = { S _ { m } } \setminus \mathcal { N } _ { z } } \end{array}$ . + +For reasons similar to Lemma 3, as $\begin{array} { r } { m \geq 2 \left| \zeta \right| ^ { 2 } \log \frac { 2 | \zeta | } { \delta } \left( 8 \frac { ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } + 1 \right) } \end{array}$ , Lemma 5 guarantees that with probability $\begin{array} { r } { 1 - \frac { \delta } { 2 } } \end{array}$ , each interval will have atleast $\begin{array} { r } { \frac { 8 ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } \log \frac { 2 | \zeta | } { \delta } } \end{array}$ samples. Then for any specific interval, Lemma 6 guarantees that with probability atleast $\begin{array} { r } { 1 - \frac { 2 | \zeta | } { \delta } } \\ { . } \end{array}$ , the majority vote for the label in that interval will succeed in returning the de-noised label. Applying a union bound over all intervals, will guarantee that with probability atleast $1 - \delta$ , the majority label of every interval will be the denoised label. As each interval $\operatorname { i n } \zeta$ has atleast one point, all the intervals in $\zeta$ with label 1 will be included in $I$ with probability $1 - \delta$ . Thus, $\mathcal { R } ( h ; \mathcal { D } _ { S , \zeta } ) = 0$ . + +Now, for all $( x , y ) \in \mathcal { M } _ { z }$ , add the interval $[ x ]$ to $I$ if $y = 1$ . If $y = 0$ then $x$ must lie a interval $( a , b ) \in I$ . Replace that interval as follows $I : = I \setminus ( a , b ) \cup \{ ( a , x ) , ( x , b ) \} ,$ . As only a finite number of sets with Lebesgue measure of 0 were added or deleted from $I$ , the net test error of $h$ doesn’t change and is still 0 i.e. $\mathcal { R } ( h ; \mathcal { D } _ { S , \zeta } ) = 0$ + +For the second part, we will invoke Theorem 1. To avoid confusion in notation, we will use $\Gamma$ instead of $\zeta$ to refer to the sets in Theorem 1 and reserve $\zeta$ for the support of interval of $\mathcal { D } _ { S , \zeta }$ . Let $\Gamma$ be any set of disjoint intervals of width $\frac { \gamma } { 2 }$ such that $\begin{array} { r } { | \Gamma | = \frac { 0 . 1 | \zeta | } { \gamma } } \end{array}$ 0.1|ζ|γ . This is always possible as the total width of all intervals in $\Gamma$ is $\begin{array} { r } { \frac { 0 . 1 | \zeta | } { \gamma } \frac { \gamma } { 2 } = 0 . 1 \frac { | \zeta | } { 2 } } \end{array}$ which is less than the total width of the support |ζ|2 . c1, c2 from Eq. (3) is + +$$ +c _ { 1 } = \mathbb { P } _ { \mathcal { D } _ { S , \zeta } } \left[ \Gamma \right] = \frac { 2 * 0 . 1 \left| \zeta \right| } { 2 \left| \zeta \right| } = 0 . 1 , \quad c _ { 2 } = \frac { 2 \gamma } { 2 \left| \zeta \right| } \left| \zeta \right| = \gamma +$$ + +Thus, if $h$ has an error of zero on a set of $m ^ { \prime }$ examples drawn from $\mathrm { E X } ^ { \eta } \left( \mathcal { D } _ { S , \zeta } \right)$ where $m ^ { \prime } >$ $\frac { 0 . 1 | \zeta | } { \eta \gamma ^ { 2 } } \log { \left( \frac { 0 . 1 | \zeta | } { \gamma \delta } \right) }$ , then by Theorem 1, $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { D } _ { S , \zeta } ) > 0 . 1$ . + +Combining the two parts for + +$$ +m > \operatorname* { m a x } \left\{ 2 \left. \zeta \right. ^ { 2 } \log \frac { 2 \left. \zeta \right. } { \delta } \left( 8 \frac { \left( 1 - \eta \right) } { \left( 1 - 2 \eta \right) ^ { 2 } } + 1 \right) , \frac { 0 . 1 \left. \zeta \right. } { \eta \gamma ^ { 2 } } \log \left( \frac { 0 . 1 \left. \zeta \right. } { \gamma \delta } \right) \right\} +$$ + +it is possible to obtain $\textit { h } \in \textit { \textbf { \mathscr { H } } }$ such that $h$ has zero training error, $\mathcal { R } ( \mathcal { D } _ { S , \zeta } ; h ) ~ = ~ 0$ and $\mathcal { R } _ { \mathrm { A d v } , \gamma } ( h ; \mathcal { D } _ { S , \zeta } ) > 0 . 1$ for any $\gamma > 0$ . + +Lemma 5. Given samples are draw $k \in \mathbb { Z } _ { + }$ aX istribution then with $\mathcal { D } _ { S , \zeta }$ , for any ability atl ${ \delta } _ { 2 } > 0$ $\begin{array} { r } { m > 2 \left. \zeta \right. ^ { 2 } k + 2 \left. \zeta \right. ^ { 2 } \log \frac { \left. \zeta \right. } { \delta _ { 2 } } } \end{array}$ $( \mathcal { D } _ { S , \zeta } )$ $1 - \delta _ { 2 }$ $k$ in each interval $\begin{array} { r } { ( j - \frac { 1 } { 4 } , j + \frac { 1 } { 4 } ) } \end{array}$ for all $j \in \zeta$ . + +Proof of Lemma 5. We will repeat the following procedure $| \zeta |$ times once for each interval in $\zeta$ and show that with probability $\frac { \delta } { | \zeta | }$ the $j ^ { t h }$ run will result in atleast $k$ samples in the $j ^ { t h }$ interval. + +Corresponding to each interval in $\zeta$ , we will sample atleast $m ^ { \prime }$ samples where $m ^ { \prime } = 2 \left. \zeta \right. k +$ $2 \left| \zeta \right| \log \frac { \left| \zeta \right| } { \delta _ { 2 } }$ . If $z _ { i } ^ { j }$ is the random variable that is 1 when the $i ^ { t h }$ sample belongs to the $j ^ { t h }$ interval, then $j ^ { t h }$ interval has atleast $k$ points out of the $m ^ { \prime }$ points sampled for that interval with probability less than $\frac { \delta _ { 2 } } { | \zeta | }$ . + +$$ +\begin{array} { r l r l } & { \mathbb { P } \left[ \displaystyle \sum _ { i } z _ { i } ^ { j } \leq k \right] = \mathbb { P } \left[ \displaystyle \sum _ { i } z _ { i } ^ { j } \leq \left( 1 - \delta \right) \mu \right] } & & { \delta = 1 - \frac { k } { \mu } , \mu = \mathbb { E } \left[ \displaystyle \sum _ { i } z _ { i } ^ { j } \right] } \\ & { \leq \exp \left( - \left( 1 - \frac { k } { \mu } \right) ^ { 2 } \frac { \mu } { 2 } \right) } & & { \mathrm { B y ~ C h e r n o f f y ~ s i n e q u a l i t y } } \\ & { \leq \exp \left( - \left( \displaystyle \frac { m ^ { \prime } } { 2 \left. \zeta \right. } - k + \frac { k ^ { 2 } \left. \zeta \right. } { 2 m ^ { \prime } } \right) \right) } & & { \mu = \frac { m ^ { \prime } } { \left. \zeta \right. } } \\ & { \leq \exp \left( k - \frac { m ^ { \prime } } { 2 \left. \zeta \right. } \right) \leq \frac { \delta _ { 2 } } { \left. \zeta \right. } } \end{array} +$$ + +where the last step follows from m0 > 2 |ζ| k + 2 |ζ| log |ζ|δ2 . With probability atleast $\frac { \delta } { | \zeta | }$ , every interval will have atleast $k$ samples. Finally, an union bound over each interval gives the desired result. As we repeat the process for all $| \zeta |$ intervals, the total number of samples drawn will be atleast $\begin{array} { r } { \left| \zeta \right| m ^ { \prime } = 2 \left| \zeta \right| ^ { 2 } k + 2 \left| \zeta \right| ^ { 2 } \log \frac { \left| \zeta \right| } { \delta _ { 2 } } . } \end{array}$ . □ + +Lemma 6 (Majority Vote). For a given $y \in \{ 0 , 1 \}$ , let $S = \{ s _ { 1 } , \cdots , s _ { m } \}$ be a set of size m where each element is $y$ with probability $1 - \eta$ and $1 - y$ otherwise. If $\begin{array} { r } { m > \frac { 8 ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } \log \frac { 1 } { \delta _ { 1 } } } \end{array}$ then with probability atleast $1 - \delta _ { 1 }$ the majority of $S$ is $y$ . + +Proof of Lemma $6$ . Without loss of generality let $y = 1$ . For the majority to be 1 we need to show that there are more than $\frac { m } { 2 }$ “1”s in $S$ i.e. we need to show that the following probability is less than $\delta _ { 1 }$ . + +$$ +\begin{array} { r l } & { \mathbb { P } [ \sum s _ { i } < \frac { m _ { 1 } } { 2 } ] = \mathbb { P } [ \sum s _ { i } < \frac { m _ { 1 } } { 2 \mu } * \mu + \mu - \mu ] } \\ & { \qquad = \mathbb { P } [ \sum s _ { i } < ( 1 - \frac { m _ { 1 } } { 2 \mu } ) ) \mu ] } \\ & { \qquad \le \exp ( - \frac { ( 1 - 2 \eta ) ^ { 2 } } { 8 ( 1 - \eta ) ^ { 2 } } \mu ) } \\ & { \qquad = \exp ( - \frac { ( 1 - 2 \eta ) ^ { 2 } } { 8 ( 1 - \eta ) } m ) } \\ & { \qquad < \delta _ { 1 } } \end{array} +$$ + +$$ +\mu = \mathbb { E } \left[ \sum s _ { i } \right] +$$ + +$$ +\begin{array} { l } { \displaystyle \ddot { \cdot } { \mu } = ( 1 - \eta ) m } \\ { \displaystyle \ddot { \cdot } m > \frac { 8 ( 1 - \eta ) } { ( 1 - 2 \eta ) ^ { 2 } } \log \frac { 1 } { \delta _ { 1 } } } \end{array} +$$ + +# C ADDITIONAL EXPERIMENTS + +# C.1 ROBUST TRAINING IGNORES RARER SUB-POPULATIONS (SYNTHETIC SETTING) + +This phenomenon is demonstrated more clearly in a simpler distribution for different NN configurations in Figure 7. We create a binary classification problem on $\mathbb { R } ^ { 2 }$ . The data is uniformly supported + +
ETrain-Acc. (%) Test-Acc (%)
0.0 99.9895.25
0.2597.23 92.77
1.0 86.0381.62
+ +Table 1: Train and test accuracies on clean CIFAR10 for ResNet-50 trained using $\ell _ { 2 }$ $\epsilon$ -adversaries. +The $\epsilon = 0$ setting represents the natural training. + +on non-overlapping circles of varying radiuses. All points in one circle have the same label i.e. it is either blue or red depending on the color of the circle. We train a shallow network with 2 layers and 1000 neurons in each layer (Shallow-Wide NN) and a deep network with 4 layers and 100 neurons in each layer using cross entropy loss and SGD. The background color shows the decision region of the learnt neural network. Figure 7 shows that the adversarially trained (AT) models ignore the smaller circles (i.e. rare sub-populations) and tries to get a larger margin around the circles it does classify correctly whereas the naturally trained (NAT) models correctly predicts every circle but ends up with very small margin around a lot of circles. + +![](images/b97365b01ed70d6b2e3879b0343afdb654e6edad648a42a8d76f51eb4db1c7a2.jpg) +Figure 7: Adversarial training (AT) leads to larger margin, and thus adversarial robustness around high density regions (larger circles) but causes training error on low density sub-populations (smaller circles) whereas naturally trained models (NAT) minimizes the training error but leads to regions with very small margins. + +# C.2 COMPLEXITY OF DECISION BOUNDARIES + +When neural networks are trained they create classifiers whose decisions boundaries are much simpler than they need to be for being adversarially robust. A few recent papers (Nakkiran, 2019; Schmidt et al., 2018) have discussed that robustness might require more complex classifiers. In Theorem 2 and 3 we discussed this theoretically and also why this might not violate the traditional wisdom of Occam’s Razor. In particular, complex decision boundaries does not necessarily mean more complex classifiers in statistical notions of complexity like VC dimension. In this section, we show through a simple experiment how the decision boundaries of neural networks are not “complex” enough to provide large enough margins and are thus adversarially much more vulnerable than is possible. + +We train three different neural networks with ReLU activations, a shallow network (Shallow NN) with 2 layers and 100 neurons in each layer, a shallow network with 2 layers and 1000 neurons in each layer (Shallow-Wide NN), and a deep network with 4 layers and 100 neurons in each layer. We train them for 200 epochs on a binary classification problem as constructed in Figure 8. The distribution is supported on blobs and the color of each blob represent its label. On the right side, we have the decision boundary of a large margin classifier, which is simulated using a 1-nearest neighbour. + +From Figure 8, it is evident that the decision boundaries of neural networks trained with standard optimizers have far simpler decision boundaries than is needed to be robust (eg. the 1- nearest neighbour is much more robust than the neural networks.) + +![](images/0893b4c752469406fcd18849c0240599309727c06b8e4b55356926749d47d7da.jpg) +Figure 8: Decision boundaries of neural networks are much simpler than they should be. + +# C.3 ACCOUNTING FOR FINE GRAINED SUB-POPULATIONS LEADS TO BETTER ROBUSTNESS + +One way to evaluate whether more meaningful representations lead to better robust accuracy is to use training data with more fine-grained labels (e.g. subclasses of a class); for example, one would expect that if different breeds of dogs are labelled differently the network will learn features that are relevant to that extra information. We show both using synthetic data, CIFAR100 (Krizhevsky & Hinton, 2009), and Restricted Imagenet (Tsipras et al., 2019) that training on fine-grained labels does increase robust accuracy. + +We hypothesize that learning more meaningful representations by accounting for fine-grained subpopulations within each class may lead to better robustness. We use the theoretical setup presented in Appendix A and Figure 6b. However, if each of the circles belonged to a separate class then the decision boundary would have to be necessarily more complex as it needs to, now, separate the balls that were previously within the same class. We test this hypothesis with two experiments. First, we test it on the the distribution defined in Theorem 3 where for each ball with label 1, we assign it a different label (say $\alpha _ { 1 } , \cdots , \alpha _ { k } )$ and similarly for balls with label 0, we assign it a different label $( \beta _ { 1 } , \cdots , \beta _ { k } )$ . Now, we solve a multi-class classification problem for $2 k$ classes with a deep neural network and then later aggregate the results by reporting all $\alpha _ { i } \mathbf { s }$ as 1 and all $\beta _ { i } \mathbf { s }$ as 0.The resulting decision boundary is drawn in Figure 9a along with the decision boundary for natural training and AT. Clearly, the decision boundary for AT is the most complex and has the highest margin (and robustness) followed by the multi-class model and then the naturally trained model. + +Second, we also repeat the experiment with CIFAR-100. We train a ResNet50 (He et al., 2016) on the fine labels of CIFAR100 and then aggregate the fine labels corresponding to a coarse label by summing up the logits. We call this model the Fine2Coarse model and compare the adversarial risk of this network to a ResNet-50 trained directly on the coarse labels. Note that the model is end-to-end differentiable as the only addition is a layer to aggregate the logits corresponding to the fine classes pertaining to each coarse class. Thus PGD adversarial attacks can be applied out of the box. Figure 9b shows that for all perturbation budgets, Fine2Coarse has smaller adversarial risk than the naturally trained model. + +We also repeat the experiment with Restricted Imagenet (Tsipras et al., 2019) where we obtain the fine and coarse class as mentioned in Table 2. There are 60 fine classes and 10 coarse classes with each coarse class having 6 distinct fine classes in them. The train set size is 77237 and the test set size is 3000. The fine classes within each coarse are balanced i.e. given a coarse class all the fine classes in it are equally represented in this dataset. + +# D EXPERIMENTAL DETAILS + +In this section, we will discuss details about the experiments and model architectures used to help make sure that the experiments are reproducible. + +# D.1 MODEL ARCHITECTURES IN SECTION 3.1 + +The model architecture used for MNIST experiments has four convolutional layers, followed by two fully connected layers. The first four convolutional layers have 32, 64, 128, 256 output filters + +![](images/101eb05e59dd7a818689ac37c5718896ae75bfef6d112e1e4023204cdabe7ee7.jpg) + +(a) Decision Region of neural networks are more complex for adversarially trained models. Treating it as a multi-class classification problem, with natural training (MULTICLASS), also increases robustness by increasing the margin. + +![](images/77e35769acbf51ff48ed238cd8e11f861b04031257dbe402529b648103e62ff2.jpg) +Figure 9: Assigning a separate class to each sub-population within the original class during training increases robustness by learning more meaningful representations. + +Table 2: Fine-grained classes in Restricted Imagenet + +
Coarse ClassFine Classes
Dog Bird Insect Monkey Car Feline Truck Fruit Fungus BoatChihuahua,Japanese spaniel, Maltese dog,Pekinese, Shih-Tzu, Blenheim spaniel cock,hen,ostrich, brambling,goldfinch, house finch tiger beetle,ladybug,ground beetle, long-horned beetle,leaf beetle, dung beetle guenon, patas, baboon, macaque,langur, colobus jeep,limousine,cab,beach wagon,ambulance,convertible leopard, snow leopard, jaguar, lion,cougar, lynx tow truck, moving van, fire engine, pickup, garbage truck, police van Granny Smith, rapeseed, corn, acorn, hip, buckeye agaric,gyromitra, stinkhorn, earthstar, hen-of-the-woods, coral fungus
+ +and 3, 4, 3, 3 sized kernels respectively. This is followed by a fully connected layers with a hidden dimension of 1024. The network is optimized with SGD with a batch size of 128, learning rate of 0.1 for 60 epochs and learning rate is decreased to 0.01 after 50epochs. + +For experiments on CIFAR we use standard VGG19, ResNet18 and DenseNet architectures and training procedures. + +# D.2 DETAILS ON EXPERIMENTS ON MEMORIZATION AND INFLUENCE + +For a given dataset $s$ , training algorithm $\mathcal { A }$ , Zhang & Feldman (2020) measure the label memorization by $\mathcal { A }$ on $S$ using two related quantities of memorization and influence. For a training example $( x _ { i } , y _ { i } ) \in S$ and a test example $( x _ { j } ^ { \prime } , y _ { j } ^ { \prime } )$ , the two quantities are a special case of measuring the influence of $( x _ { i } , y _ { i } )$ on the expected accuracy at some example $z = ( x , y )$ . Influence on test example measures the impact of $( x _ { j } ^ { \prime } , y _ { j } ^ { \prime } )$ on the expected accuracy of $( x _ { j } ^ { \prime } , y _ { j } ^ { \prime } )$ . Memorization corresponds to the influence of example $( x _ { i } , y _ { i } )$ on the accuracy on itself (or self-influence). + +Memorization or Self-Influence: Self influence of an example with respect to an algorithm (model, optimizer etc) can be defined as how unlikely it is for the model learnt by that algorithm to be correct on an example if it had not seen that example during training compared to if it had seen the example during training. It can be formalized as followed which is borrowed from Eq (1) in Zhang & Feldman (2020) + +Memorization by $\mathcal { A }$ on example $( x _ { i } , y _ { i } ) \in S$ is defined as + +$$ +\mathrm { m e m } ( \mathcal { A } , \mathcal { S } , i ) : = \mathbb { P } _ { h A ( \mathcal { S } ) } [ h ( x _ { i } ) = y _ { i } ] - \mathbb { P } _ { h A ( \mathcal { S } ^ { \setminus i } ) } [ h ( x _ { i } ) = y _ { i } ] +$$ + +where $s ^ { \backslash i }$ denotes the dataset $s$ with $( x _ { i } , y _ { i } )$ removed, $h A ( S )$ denotes the model $h$ obtained by training using algorithm $\mathcal { A }$ (which includes the model architecture) on the dataset $s$ and the probability is taken over the randomization inherent in the training algorithm $\mathcal { A }$ . + +Influence of a training sample: Intuitively, it measures the probability that a certain test example would be classified correctly if the model were learned using a training set that did not contain the training point compared to if the training set did contain that particular training point. This can be defined as follows which is borrowed from Eq 2 in Zhang $\&$ Feldman (2020). Using a similar notation as memorization the influence of $( x _ { i } , y _ { i } )$ on $( x _ { j } ^ { \prime } , y _ { j } ^ { \prime } )$ can be measured as + +$$ +\begin{array} { r } { \operatorname* { i n f } ( \mathcal { A } , \mathcal { S } , ( x _ { i } , y _ { i } ) , ( x _ { j } ^ { \prime } , y _ { j } ^ { \prime } ) ) : = \mathbb { P } _ { h A ( \mathcal { S } ) } [ h ( x _ { j } ^ { \prime } ) = y _ { j } ^ { \prime } ] - \mathbb { P } _ { h A ( \mathcal { S } ^ { \setminus i } ) } [ h ( x _ { j } ^ { \prime } ) = y _ { j } ^ { \prime } ] } \end{array} +$$ + +We found the images in Figure 4 by manually searching for each test image, the training image that is misclassified and is visually close to it. Our search space was shortened with the help of the influence scores each training image has on the classification of a test image. We searched in the set of top-10 most influential mis-classified train images for each mis-classified test image. The model used for Figure 4 is a AT model for CIFAR10 with $\ell _ { 2 }$ -adversary with an $\epsilon = 0 . 2 5$ and a model trained with TRADES for MNIST with $\begin{array} { r } { \lambda = \frac { 1 } { 6 } } \end{array}$ and $\epsilon = 0 . 3$ . Zhang & Feldman (2020) had provided us the with the memorization scores for each image in CIFAR10 as well as the influence score of each training image on each test image for each class in CIFAR-10. High Influence pairs of Imagenet were obtained from https://pluskid.github.io/influence-memorization/. 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Coarse ClassFine Classes
Dog Bird Insect Monkey Car Feline Truck Fruit Fungus BoatChihuahua,Japanese spaniel, Maltese dog,Pekinese, Shih-Tzu, Blenheim spaniel cock,hen,ostrich, brambling,goldfinch, house finch tiger beetle,ladybug,ground beetle, long-horned beetle,leaf beetle, dung beetle guenon, patas, baboon, macaque,langur, colobus jeep,limousine,cab,beach wagon,ambulance,convertible leopard, snow leopard, jaguar, lion,cougar, lynx tow truck, moving van, fire engine, pickup, garbage truck, police van Granny Smith, rapeseed, corn, acorn, hip, buckeye agaric,gyromitra, stinkhorn, earthstar, hen-of-the-woods, coral fungus
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