gradient_visitor.hpp

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#ifndef MLPACK_METHODS_ANN_VISITOR_GRADIENT_VISITOR_HPP
#define MLPACK_METHODS_ANN_VISITOR_GRADIENT_VISITOR_HPP

#include <mlpack/methods/ann/layer/layer_traits.hpp>
#include <mlpack/methods/ann/layer/layer_types.hpp>

#include <boost/variant.hpp>

namespace mlpack {
namespace ann {

class GradientVisitor : public boost::static_visitor<void>
{
 public:
  GradientVisitor(arma::mat&& input, arma::mat&& delta);

  GradientVisitor(arma::mat&& input, arma::mat&& delta, const size_t index);

  template<typename LayerType>
  void operator()(LayerType* layer) const;

 private:
  arma::mat&& input;

  arma::mat&& delta;

  size_t index;

  bool hasIndex;

  template<typename T>
  typename std::enable_if<
      HasGradientCheck<T, arma::mat&(T::*)()>::value &&
      !HasRunCheck<T, bool&(T::*)(void)>::value, void>::type
  LayerGradients(T* layer, arma::mat& input) const;

  template<typename T>
  typename std::enable_if<
      HasGradientCheck<T, arma::mat&(T::*)()>::value &&
      HasRunCheck<T, bool&(T::*)(void)>::value, void>::type
  LayerGradients(T* layer, arma::mat& input) const;

  template<typename T, typename P>
  typename std::enable_if<
      !HasGradientCheck<T, P&(T::*)()>::value, void>::type
  LayerGradients(T* layer, P& input) const;
};

} // namespace ann
} // namespace mlpack

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

#endif