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def _start_reader_thread(self, stream, chunks):
"""Starts a thread for reading output from FFMPEG.
The thread reads consecutive chunks from the stream and saves them in
the given list.
Args:
stream: output stream of the FFMPEG process.
chunks: list to save output chunks to.
Returns:
... |
def finish(self):
"""Finishes transconding and returns the video.
Returns:
bytes
Raises:
IOError: in case of transcoding error.
"""
if self.proc is None:
return None
self.proc.stdin.close()
for thread in (self._out_thread, self._err_thread):
thread.join()
(out, ... |
def validate_flags():
"""Validates flags are set to acceptable values."""
if FLAGS.cloud_mlengine_model_name:
assert not FLAGS.server
assert not FLAGS.servable_name
else:
assert FLAGS.server
assert FLAGS.servable_name |
def make_request_fn():
"""Returns a request function."""
if FLAGS.cloud_mlengine_model_name:
request_fn = serving_utils.make_cloud_mlengine_request_fn(
credentials=GoogleCredentials.get_application_default(),
model_name=FLAGS.cloud_mlengine_model_name,
version=FLAGS.cloud_mlengine_model_... |
def encoder(self, inputs, n_layers=3):
"""Convnet that encodes inputs into mean and std of a gaussian.
Args:
inputs: 5-D Tensor, shape (batch_size, num_frames, width, height, channels)
n_layers: Number of layers.
Returns:
z_mu: Mean of the latent gaussians.
z_log_var: log(var) of the l... |
def get_fc_dimensions(self, strides, kernel_sizes):
"""Get expected fully connected shape after a series of convolutions."""
output_height, output_width, _ = self.hparams.problem.frame_shape
output_steps = self.hparams.video_num_target_frames
output_shape = np.array([output_steps, output_height, output_... |
def discriminator(self, frames):
"""3-D SNGAN discriminator.
Args:
frames: a list of batch-major tensors indexed by time.
Returns:
logits: 1-D Tensor with shape=batch_size.
Positive logits imply that the discriminator thinks that it
belongs to the true class.
""... |
def d_step(self, true_frames, gen_frames):
"""Performs the discriminator step in computing the GAN loss.
Applies stop-gradient to the generated frames while computing the
discriminator loss to make sure that the gradients are not back-propagated
to the generator. This makes sure that only the discrimin... |
def g_step(self, gen_frames, fake_logits_stop):
"""Performs the generator step in computing the GAN loss.
Args:
gen_frames: Generated frames
fake_logits_stop: Logits corresponding to the generated frames as per
the discriminator. Assumed to have a stop-gradient term.
Ret... |
def get_gan_loss(self, true_frames, gen_frames, name):
"""Get the discriminator + generator loss at every step.
This performs an 1:1 update of the discriminator and generator at every
step.
Args:
true_frames: 5-D Tensor of shape (num_steps, batch_size, H, W, C)
Assumed to be g... |
def get_extra_loss(self, latent_means=None, latent_stds=None,
true_frames=None, gen_frames=None):
"""Gets extra loss from VAE and GAN."""
if not self.is_training:
return 0.0
vae_loss, d_vae_loss, d_gan_loss = 0.0, 0.0, 0.0
# Use sv2p's KL divergence computation.
if self.h... |
def pad_conv3d_lrelu(self, activations, n_filters, kernel_size, strides,
scope):
"""Pad, apply 3-D convolution and leaky relu."""
padding = [[0, 0], [1, 1], [1, 1], [1, 1], [0, 0]]
# tf.nn.conv3d accepts a list of 5 values for strides
# with first and last value equal to 1
if... |
def weight(w, sparsity):
"""Weight-level magnitude pruning."""
w_shape = common_layers.shape_list(w)
k = int(np.prod(w_shape[:-1]))
count = tf.to_int32(k * sparsity)
mask = common_layers.weight_targeting(w, count)
return (1 - mask) * w |
def unit(w, sparsity):
"""Unit-level magnitude pruning."""
w_shape = common_layers.shape_list(w)
count = tf.to_int32(w_shape[-1] * sparsity)
mask = common_layers.unit_targeting(w, count)
return (1 - mask) * w |
def sparsify(sess, eval_model, pruning_strategy, pruning_params):
"""Prune the weights of a model and evaluate."""
weights = tf.trainable_variables()
def should_prune(name):
"""Whether to prune a weight or not."""
in_whitelist = not pruning_params.white_list or any(
e in name for e in pruning_par... |
def load_config(self):
"""Loads the configuration."""
config = dict([(key, value) for key, value in iteritems(self.options)
if key in self.cfg.settings and value is not None])
for key, value in iteritems(config):
self.cfg.set(key.lower(), value) |
def ppo_base_v1():
"""Set of hyperparameters."""
hparams = common_hparams.basic_params1()
hparams.learning_rate_schedule = "constant"
hparams.learning_rate_constant = 1e-4
hparams.clip_grad_norm = 0.5
hparams.weight_decay = 0
# If set, extends the LR warmup to all epochs except the final one.
hparams.ad... |
def ppo_atari_base():
"""Pong base parameters."""
hparams = ppo_discrete_action_base()
hparams.learning_rate_constant = 1e-4
hparams.epoch_length = 200
hparams.gae_gamma = 0.985
hparams.gae_lambda = 0.985
hparams.entropy_loss_coef = 0.003
hparams.value_loss_coef = 1
hparams.optimization_epochs = 3
h... |
def ppo_original_params():
"""Parameters based on the original PPO paper."""
hparams = ppo_atari_base()
hparams.learning_rate_constant = 2.5e-4
hparams.gae_gamma = 0.99
hparams.gae_lambda = 0.95
hparams.clipping_coef = 0.1
hparams.value_loss_coef = 1
hparams.entropy_loss_coef = 0.01
hparams.eval_every... |
def ppo_original_world_model():
"""Atari parameters with world model as policy."""
hparams = ppo_original_params()
hparams.policy_network = "next_frame_basic_deterministic"
hparams_keys = hparams.values().keys()
video_hparams = basic_deterministic_params.next_frame_basic_deterministic()
for (name, value) in... |
def ppo_tiny_world_model():
"""Atari parameters with world model as policy."""
hparams = ppo_original_params()
hparams.policy_network = "next_frame_basic_deterministic"
hparams_keys = hparams.values().keys()
video_hparams = basic_deterministic_params.next_frame_tiny()
for (name, value) in six.iteritems(vide... |
def ppo_original_world_model_stochastic_discrete():
"""Atari parameters with stochastic discrete world model as policy."""
hparams = ppo_original_params()
hparams.policy_network = "next_frame_basic_stochastic_discrete"
hparams_keys = hparams.values().keys()
video_hparams = basic_stochastic.next_frame_basic_st... |
def make_simulated_env_fn(**env_kwargs):
"""Returns a function creating a simulated env, in or out of graph.
Args:
**env_kwargs: kwargs to pass to the simulated env constructor.
Returns:
Function in_graph -> env.
"""
def env_fn(in_graph):
class_ = SimulatedBatchEnv if in_graph else SimulatedBatc... |
def make_simulated_env_kwargs(real_env, hparams, **extra_kwargs):
"""Extracts simulated env kwargs from real_env and loop hparams."""
objs_and_attrs = [
(real_env, [
"reward_range", "observation_space", "action_space", "frame_height",
"frame_width"
]),
(hparams, ["frame_stack_s... |
def get_policy(observations, hparams, action_space):
"""Get a policy network.
Args:
observations: observations
hparams: parameters
action_space: action space
Returns:
Tuple (action logits, value).
"""
if not isinstance(action_space, gym.spaces.Discrete):
raise ValueError("Expecting discr... |
def rlmf_tictactoe():
"""Base set of hparams for model-free PPO."""
hparams = rlmf_original()
hparams.game = "tictactoe"
hparams.rl_env_name = "T2TEnv-TicTacToeEnv-v0"
# Since we don't have any no-op actions, otherwise we have to have an
# attribute called `get_action_meanings`.
hparams.eval_max_num_noops... |
def rlmf_tiny():
"""Tiny set of hparams for model-free PPO."""
hparams = rlmf_original()
hparams = hparams.override_from_dict(rlmf_tiny_overrides())
hparams.batch_size = 2
hparams.base_algo_params = "ppo_original_tiny"
hparams.add_hparam("ppo_epochs_num", 3)
hparams.add_hparam("ppo_epoch_length", 2)
ret... |
def rlmf_dqn_tiny():
"""Tiny DQN params."""
hparams = rlmf_original()
hparams = hparams.override_from_dict(rlmf_tiny_overrides())
hparams.batch_size = 1
hparams.base_algo = "dqn"
hparams.base_algo_params = "dqn_original_params"
hparams.add_hparam("dqn_num_frames", 128)
hparams.add_hparam("dqn_save_every... |
def rlmf_eval():
"""Eval set of hparams for model-free PPO."""
hparams = rlmf_original()
hparams.batch_size = 8
hparams.eval_sampling_temps = [0.0, 0.5, 1.0]
hparams.eval_rl_env_max_episode_steps = -1
hparams.add_hparam("ppo_epoch_length", 128)
hparams.add_hparam("ppo_optimization_batch_size", 32)
hpara... |
def feed_forward_gaussian_fun(action_space, config, observations):
"""Feed-forward Gaussian."""
if not isinstance(action_space, gym.spaces.box.Box):
raise ValueError("Expecting continuous action space.")
mean_weights_initializer = tf.initializers.variance_scaling(
scale=config.init_mean_factor)
logst... |
def _curvature_range(self):
"""Curvature range.
Returns:
h_max_t, h_min_t ops
"""
self._curv_win = tf.get_variable("curv_win",
dtype=tf.float32,
trainable=False,
shape=[self.curvature_wi... |
def _grad_variance(self):
"""Estimate of gradient Variance.
Returns:
C_t ops.
"""
grad_var_ops = []
tensor_to_avg = []
for t, g in zip(self._vars, self._grad):
if isinstance(g, tf.IndexedSlices):
tensor_to_avg.append(
tf.reshape(tf.unsorted_segment_sum(g.values,
... |
def _dist_to_opt(self):
"""Distance to optimum.
Returns:
D_t ops
"""
dist_to_opt_ops = []
# Running average of the norm of gradient
self._grad_norm = tf.sqrt(self._grad_norm_squared)
avg_op = self._moving_averager.apply([self._grad_norm,])
dist_to_opt_ops.append(avg_op)
with t... |
def _grad_sparsity(self):
"""Gradient sparsity."""
# If the sparse minibatch gradient has 10 percent of its entries
# non-zero, its sparsity is 0.1.
# The norm of dense gradient averaged from full dataset
# are roughly estimated norm of minibatch
# sparse gradient norm * sqrt(sparsity)
# An ... |
def _prepare_variables(self):
"""Prepare Variables for YellowFin.
Returns:
Grad**2, Norm, Norm**2, Mean(Norm**2) ops
"""
self._moving_averager = tf.train.ExponentialMovingAverage(
decay=self._beta, zero_debias=self._zero_debias)
# assert self._grad is not None and len(self._grad) > 0
... |
def _get_cubic_root(self):
"""Get the cubic root."""
# We have the equation x^2 D^2 + (1-x)^4 * C / h_min^2
# where x = sqrt(mu).
# We substitute x, which is sqrt(mu), with x = y + 1.
# It gives y^3 + py = q
# where p = (D^2 h_min^2)/(2*C) and q = -p.
# We use the Vieta's substitution to com... |
def _get_lr_tensor(self):
"""Get lr minimizing the surrogate.
Returns:
The lr_t.
"""
lr = tf.squared_difference(1.0, tf.sqrt(self._mu)) / self._h_min
return lr |
def _get_mu_tensor(self):
"""Get the min mu which minimize the surrogate.
Returns:
The mu_t.
"""
root = self._get_cubic_root()
dr = self._h_max / self._h_min
mu = tf.maximum(
root**2, ((tf.sqrt(dr) - 1) / (tf.sqrt(dr) + 1))**2)
return mu |
def _yellowfin(self):
"""YellowFin auto-tuning optimizer based on momentum SGD.
Returns:
YF ops
(Curvature range,
Grad_variance,
Dist_to_opt,
Single-Step,
Auto-Tuning)
"""
# List for the returned Operations.
yellowfin_ops = []
# Curvature range... |
def apply_gradients(self, grads_and_vars, global_step=None, name=None):
"""Applying gradients and tune hyperparams with YellowFin.
Args:
grads_and_vars: List of (gradient, variable) pairs as returned by
compute_gradients().
global_step: Optional Variable to increment by one after the
... |
def compute_gradients(self,
loss,
var_list,
global_step=None,
gate_gradients=GATE_OP,
aggregation_method=None,
colocate_gradients_with_ops=False,
name=N... |
def minimize(self,
loss,
global_step=None,
var_list=None,
gate_gradients=GATE_OP,
aggregation_method=None,
colocate_gradients_with_ops=False,
name=None,
grad_loss=None):
"""Adapted from TensorFlow... |
def residual_dilated_conv(x, repeat, padding, name, hparams):
"""A stack of convolution blocks with residual connections."""
with tf.variable_scope(name):
k = (hparams.kernel_height, hparams.kernel_width)
dilations_and_kernels = [((2**i, 1), k)
for i in range(hparams.num_hidden_... |
def bytenet_internal(inputs, targets, hparams):
"""ByteNet, main step used for training."""
with tf.variable_scope("bytenet"):
# Flatten inputs and extend length by 50%.
inputs = tf.expand_dims(common_layers.flatten4d3d(inputs), axis=2)
extend_length = tf.to_int32(0.5 * tf.to_float(tf.shape(inputs)[1]))... |
def bytenet_base():
"""Set of hyperparameters."""
hparams = common_hparams.basic_params1()
hparams.batch_size = 2048
hparams.hidden_size = 768
hparams.dropout = 0.2
hparams.symbol_dropout = 0.2
hparams.label_smoothing = 0.1
hparams.clip_grad_norm = 2.0
hparams.num_hidden_layers = 4
hparams.kernel_he... |
def _download_and_parse_dataset(tmp_dir, train):
"""Downloads and prepairs the dataset to be parsed by the data_generator."""
file_path = generator_utils.maybe_download(tmp_dir, _SNLI_ZIP, _SNLI_URL)
zip_ref = zipfile.ZipFile(file_path, 'r')
zip_ref.extractall(tmp_dir)
zip_ref.close()
file_name = 'train' i... |
def _get_tokens_and_tags(parse_str):
"""Parse str to tokens and pos tags."""
tokens = []
parse_split = parse_str.split(' ')
for p in parse_split:
assert p.startswith('(') or p.endswith(')')
if p.endswith(')'):
token = p.replace(')', '')
tokens.append(token)
return tokens |
def _parse_dataset(file_path, tmp_dir, train):
"""Convert the dataset in to a simpler format.
This function creates two files. One for being processed to produce a vocab
and another to generate the data.
Args:
file_path: string, path to the file to parse.
tmp_dir: string, path to the directory to outp... |
def _get_or_generate_vocab(tmp_dir, vocab_filename, vocab_size):
"""Read or create vocabulary."""
vocab_filepath = os.path.join(tmp_dir, vocab_filename)
print('Vocab file written to: ' + vocab_filepath)
if tf.gfile.Exists(vocab_filepath):
gs = text_encoder.SubwordTextEncoder(vocab_filepath)
return gs
... |
def snli_token_generator(tmp_dir, train, vocab_size):
"""Generate example dicts."""
_download_and_parse_dataset(tmp_dir, train)
symbolizer_vocab = _get_or_generate_vocab(
tmp_dir, 'vocab.subword_text_encoder', vocab_size)
file_name = 'train' if train else 'dev'
data_file = os.path.join(tmp_dir, file_n... |
def shard(items, num_shards):
"""Split items into num_shards groups."""
sharded = []
num_per_shard = len(items) // num_shards
start = 0
for _ in range(num_shards):
sharded.append(items[start:start + num_per_shard])
start += num_per_shard
remainder = len(items) % num_shards
start = len(items) - re... |
def RandomNormalInitializer(stddev=1e-2):
"""An initializer function for random normal coefficients."""
def init(shape, rng):
return (stddev * backend.random.normal(rng, shape)).astype('float32')
return init |
def GlorotNormalInitializer(out_dim=0, in_dim=1, scale=onp.sqrt(2)):
"""An initializer function for random Glorot-scaled coefficients."""
def init(shape, rng):
fan_in, fan_out = shape[in_dim], shape[out_dim]
size = onp.prod(onp.delete(shape, [in_dim, out_dim]))
std = scale / np.sqrt((fan_in + fan_out) /... |
def GlorotUniformInitializer(out_dim=0, in_dim=1):
"""An initializer function for random uniform Glorot-scaled coefficients."""
def init(shape, rng):
fan_in, fan_out = shape[in_dim], shape[out_dim]
std = np.sqrt(2.0 / (fan_in + fan_out))
a = np.sqrt(3.0) * std
return backend.random.uniform(rng, shap... |
def one_hot(x, size, dtype=np.float32):
"""Make a n+1 dim one-hot array from n dim int-categorical array."""
return np.array(x[..., np.newaxis] == np.arange(size), dtype) |
def LogSoftmax(x, params, axis=-1, **kwargs):
"""Apply log softmax to x: log-normalize along the given axis."""
del params, kwargs
return x - backend.logsumexp(x, axis, keepdims=True) |
def Softmax(x, params, axis=-1, **kwargs):
"""Apply softmax to x: exponentiate and normalize along the given axis."""
del params, kwargs
return np.exp(x - backend.logsumexp(x, axis, keepdims=True)) |
def padtype_to_pads(in_shape, window_shape, window_strides, padding):
"""Convert padding string to list of pairs of pad values."""
padding = padding.upper()
if padding == 'SAME':
out_shape = onp.ceil(
onp.true_divide(in_shape, window_strides)).astype(int)
pad_sizes = [max((out_size - 1) * stride +... |
def _flatten_output_shape(input_shape, num_axis_to_keep=1):
"""Output shape of a flatten layer."""
if num_axis_to_keep >= len(input_shape):
raise ValueError(
"num_axis_to_keep[%d] should be less than input's rank[%d]" %
(num_axis_to_keep, len(input_shape)))
return tuple(input_shape[:num_axis_t... |
def _batch_norm_new_params(input_shape, rng, axis=(0, 1, 2),
center=True, scale=True, **kwargs):
"""Helper to initialize batch norm params."""
del rng, kwargs
axis = (axis,) if np.isscalar(axis) else axis
shape = tuple(d for i, d in enumerate(input_shape) if i not in axis)
beta = np... |
def BatchNorm(x, params, axis=(0, 1, 2), epsilon=1e-5,
center=True, scale=True, **unused_kwargs):
"""Layer construction function for a batch normalization layer."""
mean = np.mean(x, axis, keepdims=True)
# Fast but less numerically-stable variance calculation than np.var.
m1 = np.mean(x**2, axis, ... |
def _pooling_output_shape(input_shape, pool_size=(2, 2),
strides=None, padding='VALID'):
"""Helper: compute the output shape for the pooling layer."""
dims = (1,) + pool_size + (1,) # NHWC
spatial_strides = strides or (1,) * len(pool_size)
strides = (1,) + spatial_strides + (1,)
pad... |
def _pooling_general(inputs, reducer, init_val, rescaler=None,
pool_size=(2, 2), strides=None, padding='VALID'):
"""Helper: general pooling computation used in pooling layers later."""
spatial_strides = strides or (1,) * len(pool_size)
rescale = rescaler(pool_size, spatial_strides, padding) i... |
def Dropout(x, params, rate=0.0, mode='train', rng=None, **kwargs):
"""Layer construction function for a dropout layer with given rate."""
del params, kwargs
if rng is None:
msg = ('Dropout layer requires apply_fun to be called with a rng keyword '
'argument. That is, instead of `Dropout(params, in... |
def _kernel_shape(self, input_shape):
"""Helper to calculate the kernel shape."""
kernel_size_iter = iter(self._kernel_size)
return [self._filters if c == 'O' else
input_shape[self._lhs_spec.index('C')] if c == 'I' else
next(kernel_size_iter) for c in self._rhs_spec] |
def _conv_shape_tuple(self, lhs_shape, rhs_shape, strides, pads):
"""Compute the shape of a conv given input shapes in canonical order."""
if isinstance(pads, str):
pads = padtype_to_pads(lhs_shape[2:], rhs_shape[2:], strides, pads)
if len(pads) != len(lhs_shape) - 2:
msg = 'Wrong number of expl... |
def _conv_general_permutations(self, dimension_numbers):
"""Utility for convolution dimension permutations relative to Conv HLO."""
lhs_spec, rhs_spec, out_spec = dimension_numbers
lhs_char, rhs_char, out_char = ('N', 'C'), ('O', 'I'), ('N', 'C')
charpairs = (lhs_char, rhs_char, out_char)
for i, (a,... |
def _conv_general_shape_tuple(self, lhs_shape, rhs_shape, window_strides,
padding, dimension_numbers):
"""Generalized computation of conv shape."""
lhs_perm, rhs_perm, out_perm = self._conv_general_permutations(
dimension_numbers)
lhs_trans = onp.take(lhs_shape, lhs_p... |
def get_create_agent(agent_kwargs):
"""Factory for dopamine agent initialization.
Args:
agent_kwargs: dict of BatchDQNAgent parameters
Returns:
Function(sess, environment, summary_writer) -> BatchDQNAgent instance.
"""
def create_agent(sess, environment, summary_writer=None):
"""Creates a DQN a... |
def get_create_batch_env_fun(batch_env_fn, time_limit):
"""Factory for dopamine environment initialization function.
Args:
batch_env_fn: function(in_graph: bool) -> batch environment.
time_limit: time steps limit for environment.
Returns:
function (with optional, unused parameters) initializing envi... |
def _parse_hparams(hparams):
"""Split hparams, based on key prefixes.
Args:
hparams: hyperparameters
Returns:
Tuple of hparams for respectably: agent, optimizer, runner, replay_buffer.
"""
prefixes = ["agent_", "optimizer_", "runner_", "replay_buffer_"]
ret = []
for prefix in prefixes:
ret_... |
def _build_replay_buffer(self, use_staging):
"""Build WrappedReplayBuffer with custom OutOfGraphReplayBuffer."""
replay_buffer_kwargs = dict(
observation_shape=dqn_agent.NATURE_DQN_OBSERVATION_SHAPE,
stack_size=dqn_agent.NATURE_DQN_STACK_SIZE,
replay_capacity=self._replay_capacity,
... |
def add(self, observation, action, reward, terminal, *args):
"""Append artificial_done to *args and run parent method."""
# If this will be a problem for maintenance, we could probably override
# DQNAgent.add() method instead.
artificial_done = self._artificial_done and terminal
args = list(args)
... |
def step(self, actions):
"""Step."""
self._elapsed_steps += 1
obs, rewards, dones = \
[np.array(r) for r in self.batch_env.step(actions)]
if self._elapsed_steps > self._max_episode_steps:
done = True
if self._elapsed_steps > self._max_episode_steps + 1:
rewards.fill(0)
el... |
def text_cnn_base():
"""Set of hyperparameters."""
hparams = common_hparams.basic_params1()
hparams.batch_size = 4096
hparams.max_length = 256
hparams.clip_grad_norm = 0. # i.e. no gradient clipping
hparams.optimizer_adam_epsilon = 1e-9
hparams.learning_rate_schedule = "legacy"
hparams.learning_rate_de... |
def next_frame_glow_hparams():
"""Hparams for next_frame_glow."""
hparams = glow.glow_hparams()
# Possible modes are conditional and unconditional
hparams.add_hparam("gen_mode", "conditional")
hparams.add_hparam("learn_top_scale", False)
hparams.add_hparam("condition_all_levels", True)
# For each video, s... |
def next_frame_glow_bair_quant():
"""Hparams to reproduce bits-per-pixel results on BAIR action-free dataset."""
hparams = next_frame_glow_hparams()
hparams.video_num_input_frames = 3
hparams.video_num_target_frames = 10
hparams.num_train_frames = 4
hparams.num_cond_latents = 3
hparams.depth = 24
hparam... |
def next_frame_glow_bair_qual():
"""Hparams for qualitative video generation results."""
hparams = next_frame_glow_bair_quant()
hparams.coupling = "additive"
hparams.temperature = 0.5
hparams.coupling_width = 392
return hparams |
def next_frame_glow_shapes():
"""Hparams for qualitative and quantitative results on shapes dataset."""
hparams = next_frame_glow_bair_quant()
hparams.video_num_input_frames = 1
hparams.video_num_target_frames = 2
hparams.num_train_frames = 2
hparams.num_cond_latents = 1
hparams.coupling = "additive"
hp... |
def get_cond_latents(all_latents=None, hparams=None):
"""Get z^{cond}_{t} given z^{1..t-1}.
Args:
all_latents: list of list of tensors,
outer-size equals no.of time_steps-1
inner-size equals hparams.n_levels.
hparams: See next_frame_glow_hparams.
Returns:
cond_latent... |
def basic_fc_small():
"""Small fully connected model."""
hparams = common_hparams.basic_params1()
hparams.learning_rate = 0.1
hparams.batch_size = 128
hparams.hidden_size = 256
hparams.num_hidden_layers = 2
hparams.initializer = "uniform_unit_scaling"
hparams.initializer_gain = 1.0
hparams.weight_deca... |
def _layer_stack(mp,
inputs,
self_attention_bias,
layers,
hparams,
encoder_output=None,
encoder_decoder_attention_bias=None):
"""A stack of layers.
Args:
mp: a Parallelism object
inputs: a list of Tensors
... |
def transformer_symshard_base():
"""Set of hyperparameters."""
hparams = common_hparams.basic_params1()
hparams.hidden_size = 256
hparams.batch_size = 2048
hparams.max_length = 0
# All hyperparameters ending in "dropout" are automatically set to 0.0
# when not in training mode.
hparams.layer_prepostproc... |
def imagenet_pixelrnn_generator(tmp_dir,
training,
size=_IMAGENET_SMALL_IMAGE_SIZE):
"""Image generator for Imagenet 64x64 downsampled images.
It assumes that the data has been downloaded from
http://image-net.org/small/*_32x32.tar or
http://image... |
def imagenet_preprocess_example(example, mode, resize_size=None,
normalize=True):
"""Preprocessing used for Imagenet and similar problems."""
resize_size = resize_size or [299, 299]
assert resize_size[0] == resize_size[1]
image = example["inputs"]
if mode == tf.estimator.ModeK... |
def _crop(image, offset_height, offset_width, crop_height, crop_width):
"""Crops the given image using the provided offsets and sizes.
Note that the method doesn't assume we know the input image size but it does
assume we know the input image rank.
Args:
image: `Tensor` image of shape [height, width, chan... |
def distorted_bounding_box_crop(image,
bbox,
min_object_covered=0.1,
aspect_ratio_range=(0.75, 1.33),
area_range=(0.05, 1.0),
max_attempts=100,
... |
def _random_crop(image, size):
"""Make a random crop of (`size` x `size`)."""
bbox = tf.constant([0.0, 0.0, 1.0, 1.0], dtype=tf.float32, shape=[1, 1, 4])
random_image, bbox = distorted_bounding_box_crop(
image,
bbox,
min_object_covered=0.1,
aspect_ratio_range=(3. / 4, 4. / 3.),
area_... |
def _at_least_x_are_true(a, b, x):
"""At least `x` of `a` and `b` `Tensors` are true."""
match = tf.equal(a, b)
match = tf.cast(match, tf.int32)
return tf.greater_equal(tf.reduce_sum(match), x) |
def _do_scale(image, size):
"""Rescale the image by scaling the smaller spatial dimension to `size`."""
shape = tf.cast(tf.shape(image), tf.float32)
w_greater = tf.greater(shape[0], shape[1])
shape = tf.cond(w_greater,
lambda: tf.cast([shape[0] / shape[1] * size, size], tf.int32),
... |
def _center_crop(image, size):
"""Crops to center of image with specified `size`."""
image_height = tf.shape(image)[0]
image_width = tf.shape(image)[1]
offset_height = ((image_height - size) + 1) / 2
offset_width = ((image_width - size) + 1) / 2
image = _crop(image, offset_height, offset_width, size, size)... |
def _normalize(image):
"""Normalize the image to zero mean and unit variance."""
offset = tf.constant(MEAN_RGB, shape=[1, 1, 3])
image -= offset
scale = tf.constant(STDDEV_RGB, shape=[1, 1, 3])
image /= scale
return image |
def preprocess_for_train(image, image_size=224, normalize=True):
"""Preprocesses the given image for evaluation.
Args:
image: `Tensor` representing an image of arbitrary size.
image_size: int, how large the output image should be.
normalize: bool, if True the image is normalized.
Returns:
A prep... |
def preprocess_for_eval(image, image_size=224, normalize=True):
"""Preprocesses the given image for evaluation.
Args:
image: `Tensor` representing an image of arbitrary size.
image_size: int, how large the output image should be.
normalize: bool, if True the image is normalized.
Returns:
A prepr... |
def MultifactorSchedule(history=None,
factors="constant * linear_warmup * rsqrt_decay",
constant=0.1,
warmup_steps=100,
decay_factor=0.5,
steps_per_decay=20000):
"""Factor-based learning rate schedu... |
def EvalAdjustingSchedule(history,
constant=0.1,
steps_to_decrease=20,
improvement_margin=0.001,
decrease_rate=1.5,
history_mode="eval",
metric="metrics/accuracy"):... |
def project_hidden(x, projection_tensors, hidden_size, num_blocks):
"""Project encoder hidden state under num_blocks using projection tensors.
Args:
x: Encoder hidden state of shape [batch_size, latent_dim, hidden_size].
projection_tensors: Projection tensors used to project the hidden state.
hidden_s... |
def slice_hidden(x, hidden_size, num_blocks):
"""Slice encoder hidden state under num_blocks.
Args:
x: Encoder hidden state of shape [batch_size, latent_dim, hidden_size].
hidden_size: Dimension of the latent space.
num_blocks: Number of blocks in DVQ.
Returns:
Sliced states of shape [batch_size... |
def nearest_neighbor(x,
means,
block_v_size,
random_top_k=1,
soft_em=False,
num_samples=1,
sum_over_latents=False,
summary=True):
"""Find the nearest element in means to e... |
def embedding_lookup(x,
means,
num_blocks,
block_v_size,
bottleneck_kind="dvq",
random_top_k=1,
soft_em=False,
num_samples=1,
do_hard_gumbel_softmax=Fal... |
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