backward_visitor.hpp

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#ifndef MLPACK_METHODS_ANN_VISITOR_BACKWARD_VISITOR_HPP
#define MLPACK_METHODS_ANN_VISITOR_BACKWARD_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 BackwardVisitor : public boost::static_visitor<void>
{
 public:
  BackwardVisitor(const arma::mat& input,
                  const arma::mat& error,
                  arma::mat& delta);

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

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

  void operator()(MoreTypes layer) const;

 private:
  const arma::mat& input;

  const arma::mat& error;

  arma::mat& delta;

  size_t index;

  bool hasIndex;

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

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

} // namespace ann
} // namespace mlpack

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

#endif