| --- |
| title: Sigmoid Layer |
| --- |
| |
| # Sigmoid Layer |
|
|
| * Layer type: `Sigmoid` |
| * [Doxygen Documentation](http://caffe.berkeleyvision.org/doxygen/classcaffe_1_1SigmoidLayer.html) |
| * Header: [`./include/caffe/layers/sigmoid_layer.hpp`](https://github.com/BVLC/caffe/blob/master/include/caffe/layers/sigmoid_layer.hpp) |
| * CPU implementation: [`./src/caffe/layers/sigmoid_layer.cpp`](https://github.com/BVLC/caffe/blob/master/src/caffe/layers/sigmoid_layer.cpp) |
| * CUDA GPU implementation: [`./src/caffe/layers/sigmoid_layer.cu`](https://github.com/BVLC/caffe/blob/master/src/caffe/layers/sigmoid_layer.cu) |
| * Example (from [`./examples/mnist/mnist_autoencoder.prototxt`](https://github.com/BVLC/caffe/blob/master/examples/mnist/mnist_autoencoder.prototxt)): |
|
|
| layer { |
| name: "encode1neuron" |
| bottom: "encode1" |
| top: "encode1neuron" |
| type: "Sigmoid" |
| } |
| |
| The `Sigmoid` layer computes `sigmoid(x)` for each element `x` in the bottom blob. |
|
|
| ## Parameters |
|
|
| * Parameters (`SigmoidParameter sigmoid_param`) |
| * From [`./src/caffe/proto/caffe.proto`](https://github.com/BVLC/caffe/blob/master/src/caffe/proto/caffe.proto): |
|
|
| {% highlight Protobuf %} |
| {% include proto/SigmoidParameter.txt %} |
| {% endhighlight %} |
|
|
