bicubic_interpolation.hpp

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#ifndef MLPACK_METHODS_ANN_LAYER_BICUBIC_INTERPOLATION_HPP
#define MLPACK_METHODS_ANN_LAYER_BICUBIC_INTERPOLATION_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace ann  {

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

  BicubicInterpolation(const size_t inRowSize,
                       const size_t inColSize,
                       const size_t outRowSize,
                       const size_t outColSize,
                       const size_t depth,
                       const double alpha = -0.75);

  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>& gradient,
                arma::Mat<eT>& output);

  void GetKernalWeight(double delta, arma::mat& coeffs);

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

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

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

  size_t const& InRowSize() const { return inRowSize; }
  size_t& InRowSize() { return inRowSize; }

  size_t const& InColSize() const { return inColSize; }
  size_t& InColSize() { return inColSize; }

  size_t const& OutRowSize() const { return outRowSize; }
  size_t& OutRowSize() { return outRowSize; }

  size_t const& OutColSize() const { return outColSize; }
  size_t& OutColSize() { return outColSize; }

  size_t const& InDepth() const { return depth; }
  size_t& InDepth() { return depth; }

  double const& Alpha() const { return alpha; }
  double& Alpha() { return alpha; }

  size_t InputShape() const
  {
    return inRowSize;
  }

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

 private:
  typedef typename OutputDataType::elem_type ElemType;

  size_t inRowSize;
  size_t inColSize;
  size_t outRowSize;
  size_t outColSize;
  size_t depth;
  double alpha;
  size_t batchSize;
  OutputDataType delta;
  OutputDataType outputParameter;
  OutputDataType weights;
}; // class BicubicInterpolation

} // namespace ann
} // namespace mlpack

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

#endif