minibatch_discrimination.hpp

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#ifndef MLPACK_METHODS_ANN_LAYER_MINIBATCH_DISCRIMINATION_HPP
#define MLPACK_METHODS_ANN_LAYER_MINIBATCH_DISCRIMINATION_HPP

#include <mlpack/prereqs.hpp>

#include "layer_types.hpp"

namespace mlpack {
namespace ann  {

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

  MiniBatchDiscrimination(const size_t inSize,
                          const size_t outSize,
                          const size_t features);

  void Reset();

  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);

  template<typename eT>
  void Gradient(const arma::Mat<eT>& input,
                const arma::Mat<eT>& /* error */,
                arma::Mat<eT>& gradient);

  OutputDataType const& Parameters() const { return weights; }
  OutputDataType& Parameters() { return weights; }

  InputDataType const& InputParameter() const { return inputParameter; }
  InputDataType& InputParameter() { return inputParameter; }

  OutputDataType const& OutputParameter() const { return outputParameter; }
  OutputDataType& OutputParameter() { return outputParameter; }

  OutputDataType const& Delta() const { return delta; }
  OutputDataType& Delta() { return delta; }

  OutputDataType const& Gradient() const { return gradient; }
  OutputDataType& Gradient() { return gradient; }

  size_t InputShape() const
  {
    return A;
  }

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

 private:
  size_t A, B, C;

  size_t batchSize;

  arma::mat tempM;

  OutputDataType weights;

  OutputDataType weight;

  arma::cube M;

  arma::cube deltaM;

  arma::cube distances;

  OutputDataType delta;

  OutputDataType deltaTemp;

  OutputDataType gradient;

  InputDataType inputParameter;

  OutputDataType outputParameter;
}; // class MiniBatchDiscrimination

} // namespace ann
} // namespace mlpack

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

#endif