adaptive_max_pooling.hpp

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#ifndef MLPACK_METHODS_ANN_LAYER_ADAPTIVE_MAX_POOLING_HPP
#define MLPACK_METHODS_ANN_LAYER_ADAPTIVE_MAX_POOLING_HPP

#include <mlpack/prereqs.hpp>
#include "layer_types.hpp"

namespace mlpack {
namespace ann  {

template <
    typename InputDataType = arma::mat,
    typename OutputDataType = arma::mat
>
class AdaptiveMaxPooling
{
 public:
  AdaptiveMaxPooling();

  AdaptiveMaxPooling(const size_t outputWidth,
                     const size_t outputHeight);

  AdaptiveMaxPooling(const std::tuple<size_t, size_t>& outputShape);

  template<typename eT>
  void Forward(const arma::Mat<eT>& input, arma::Mat<eT>& output);

  template<typename eT>
  void Backward(const arma::Mat<eT>& input,
                const arma::Mat<eT>& gy,
                arma::Mat<eT>& g);

  const OutputDataType& OutputParameter() const
  { return poolingLayer.OutputParameter(); }

  OutputDataType& OutputParameter() { return poolingLayer.OutputParameter(); }

  const OutputDataType& Delta() const { return poolingLayer.Delta(); }
  OutputDataType& Delta() { return poolingLayer.Delta(); }

  size_t InputWidth() const { return poolingLayer.InputWidth(); }
  size_t& InputWidth() { return poolingLayer.InputWidth(); }

  size_t InputHeight() const { return poolingLayer.InputHeight(); }
  size_t& InputHeight() { return poolingLayer.InputHeight(); }

  size_t OutputWidth() const { return outputWidth; }
  size_t& OutputWidth() { return outputWidth; }

  size_t OutputHeight() const { return outputHeight; }
  size_t& OutputHeight() { return outputHeight; }

  size_t InputSize() const { return poolingLayer.InputSize(); }

  size_t OutputSize() const { return poolingLayer.OutputSize(); }

  size_t WeightSize() const { return 0; }

  template<typename Archive>
  void serialize(Archive& ar, const uint32_t version);

 private:
  void IntializeAdaptivePadding()
  {
    poolingLayer.StrideWidth() = std::floor(poolingLayer.InputWidth() /
        outputWidth);
    poolingLayer.StrideHeight() = std::floor(poolingLayer.InputHeight() /
        outputHeight);

    poolingLayer.KernelWidth() = poolingLayer.InputWidth() -
        (outputWidth - 1) * poolingLayer.StrideWidth();
    poolingLayer.KernelHeight() = poolingLayer.InputHeight() -
        (outputHeight - 1) * poolingLayer.StrideHeight();

    if (poolingLayer.KernelHeight() <= 0 || poolingLayer.KernelWidth() <= 0 ||
        poolingLayer.StrideWidth() <= 0 || poolingLayer.StrideHeight() <= 0)
    {
      Log::Fatal << "Given output shape (" << outputWidth << ", "
        << outputHeight << ") is not possible for given input shape ("
        << poolingLayer.InputWidth() << ", " << poolingLayer.InputHeight()
        << ")." << std::endl;
    }
  }

  MaxPooling<InputDataType, OutputDataType> poolingLayer;

  size_t outputWidth;

  size_t outputHeight;

  bool reset;
}; // class AdaptiveMaxPooling

} // namespace ann
} // namespace mlpack

// Include implementation.
#include "adaptive_max_pooling_impl.hpp"

#endif