triplet_margin_loss.hpp

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#ifndef MLPACK_ANN_LOSS_FUNCTION_TRIPLET_MARGIN_LOSS_HPP
#define MLPACK_ANN_LOSS_FUNCTION_TRIPLET_MARGIN_LOSS_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace ann  {

template <
    typename InputDataType = arma::mat,
    typename OutputDataType = arma::mat
>
class TripletMarginLoss
{
 public:
  TripletMarginLoss(const double margin = 1.0);

  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 Margin() const { return margin; }
  double& Margin() { return margin; }

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

 private:
  OutputDataType outputParameter;

  double margin;
}; // class TripletLossMargin

} // namespace ann
} // namespace mlpack

// include implementation.
#include "triplet_margin_loss_impl.hpp"

#endif