binary_cross_entropy_loss.hpp

#ifndef MLPACK_METHODS_ANN_LOSS_FUNCTIONS_CROSS_ENTROPY_ERROR_HPP
#define MLPACK_METHODS_ANN_LOSS_FUNCTIONS_CROSS_ENTROPY_ERROR_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace ann  {

template <
    typename InputDataType = arma::mat,
    typename OutputDataType = arma::mat
>
class BCELoss
{
 public:
  BCELoss(const double eps = 1e-10, const bool reduction = true);

  template<typename PredictionType, typename TargetType>
  typename PredictionType::elem_type Forward(const PredictionType& prediction,
                                             const TargetType& target);

  template<typename PredictionType, typename TargetType, typename LossType>
  void Backward(const PredictionType& prediction,
                const TargetType& target,
                LossType& loss);

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

  double Eps() const { return eps; }
  double& Eps() { return eps; }

  bool Reduction() const { return reduction; }
  bool& Reduction() { return reduction; }

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

 private:
  OutputDataType outputParameter;

  double eps;

  bool reduction;
}; // class BCELoss

template <
    typename InputDataType = arma::mat,
    typename OutputDataType = arma::mat
>
using CrossEntropyError = BCELoss<
    InputDataType, OutputDataType>;

} // namespace ann
} // namespace mlpack

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

#endif