earth_mover_distance_impl.hpp

Go to the documentation of this file.

#ifndef MLPACK_METHODS_ANN_LOSS_FUNCTIONS_EARTH_MOVER_DISTANCE_IMPL_HPP
#define MLPACK_METHODS_ANN_LOSS_FUNCTIONS_EARTH_MOVER_DISTANCE_IMPL_HPP

// In case it hasn't yet been included.
#include "earth_mover_distance.hpp"

namespace mlpack {
namespace ann  {

template<typename InputDataType, typename OutputDataType>
EarthMoverDistance<InputDataType, OutputDataType>::EarthMoverDistance()
{
  // Nothing to do here.
}

template<typename InputDataType, typename OutputDataType>
template<typename PredictionType, typename TargetType>
typename PredictionType::elem_type
EarthMoverDistance<InputDataType, OutputDataType>::Forward(
    const PredictionType& prediction,
    const TargetType& target)
{
  return -arma::accu(target % prediction);
}

template<typename InputDataType, typename OutputDataType>
template<typename PredictionType, typename TargetType, typename LossType>
void EarthMoverDistance<InputDataType, OutputDataType>::Backward(
    const PredictionType& /* prediction */,
    const TargetType& target,
    LossType& loss)
{
  loss = -target;
}

template<typename InputDataType, typename OutputDataType>
template<typename Archive>
void EarthMoverDistance<InputDataType, OutputDataType>::serialize(
    Archive& /* ar */,
    const uint32_t /* version */)
{
  /* Nothing to do here */
}

} // namespace ann
} // namespace mlpack

#endif