negative_log_likelihood.hpp

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#ifndef MLPACK_METHODS_ANN_LAYER_NEGATIVE_LOG_LIKELIHOOD_HPP
#define MLPACK_METHODS_ANN_LAYER_NEGATIVE_LOG_LIKELIHOOD_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace ann  {

template<typename MatType = arma::mat>
class NegativeLogLikelihoodType
{
 public:
  NegativeLogLikelihoodType(const bool reduction = true);

  double Forward(const MatType& prediction,
                 const MatType& target);

  void Backward(const MatType& prediction,
                const MatType& target,
                MatType& loss);

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

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

 private:
  bool reduction;
}; // class NegativeLogLikelihoodType

// Default typedef for typical `arma::mat` usage.
typedef NegativeLogLikelihoodType<arma::mat> NegativeLogLikelihood;

} // namespace ann
} // namespace mlpack

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

#endif