gradient_update_visitor.hpp

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#ifndef MLPACK_METHODS_ANN_VISITOR_GRADIENT_UPDATE_VISITOR_HPP
#define MLPACK_METHODS_ANN_VISITOR_GRADIENT_UPDATE_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 GradientUpdateVisitor : public boost::static_visitor<size_t>
{
 public:
  GradientUpdateVisitor(arma::mat&& gradient, size_t offset = 0);

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

 private:
  arma::mat&& gradient;

  size_t offset;

  template<typename T>
  typename std::enable_if<
      HasGradientCheck<T, arma::mat&(T::*)()>::value &&
      !HasModelCheck<T, std::vector<LayerTypes>&(T::*)()>::value, size_t>::type
  LayerGradients(T* layer, arma::mat& input) const;

  template<typename T>
  typename std::enable_if<
      !HasGradientCheck<T, arma::mat&(T::*)()>::value &&
      HasModelCheck<T, std::vector<LayerTypes>&(T::*)()>::value, size_t>::type
  LayerGradients(T* layer, arma::mat& input) const;

  template<typename T>
  typename std::enable_if<
      HasGradientCheck<T, arma::mat&(T::*)()>::value &&
      HasModelCheck<T, std::vector<LayerTypes>&(T::*)()>::value, size_t>::type
  LayerGradients(T* layer, arma::mat& input) const;

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

} // namespace ann
} // namespace mlpack

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

#endif