cv_function.hpp

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#ifndef MLPACK_CORE_HPT_CV_FUNCTION_HPP
#define MLPACK_CORE_HPT_CV_FUNCTION_HPP

#include <mlpack/core.hpp>

namespace mlpack {
namespace hpt {

template<typename CVType,
         typename MLAlgorithm,
         size_t TotalArgs,
         typename... BoundArgs>
class CVFunction
{
 public:
  CVFunction(CVType& cv,
             const double relativeDelta,
             const double minDelta,
             const BoundArgs&... args);

  double Evaluate(const arma::mat& parameters);

  void Gradient(const arma::mat& parameters, arma::mat& gradient);

  MLAlgorithm& BestModel() { return bestModel; }

 private:
  using BoundArgsTupleType = std::tuple<BoundArgs...>;

  static const size_t BoundArgsAmount =
      std::tuple_size<BoundArgsTupleType>::value;

  template<size_t BoundArgIndex,
           size_t ParamIndex,
           bool BoundArgsIndexInRange = (BoundArgIndex < BoundArgsAmount)>
  struct UseBoundArg;

  CVType& cv;

  BoundArgsTupleType boundArgs;

  double bestObjective;

  MLAlgorithm bestModel;

  double relativeDelta;

  double minDelta;

  template<size_t BoundArgIndex,
           size_t ParamIndex,
           typename... Args,
           typename = typename
               std::enable_if<(BoundArgIndex + ParamIndex < TotalArgs)>::type>
  inline double Evaluate(const arma::mat& parameters, const Args&... args);

  template<size_t BoundArgIndex,
           size_t ParamIndex,
           typename... Args,
           typename = typename
               std::enable_if<BoundArgIndex + ParamIndex == TotalArgs>::type,
           typename = void>
  inline double Evaluate(const arma::mat& parameters, const Args&... args);

  template<size_t BoundArgIndex,
           size_t ParamIndex,
           typename... Args,
           typename = typename std::enable_if<
               UseBoundArg<BoundArgIndex, ParamIndex>::value>::type>
  inline double PutNextArg(const arma::mat& parameters, const Args&... args);

  template<size_t BoundArgIndex,
           size_t ParamIndex,
           typename... Args,
           typename = typename std::enable_if<
               !UseBoundArg<BoundArgIndex, ParamIndex>::value>::type,
           typename = void>
  inline double PutNextArg(const arma::mat& parameters, const Args&... args);
};


} // namespace hpt
} // namespace mlpack

// Include implementation
#include "cv_function_impl.hpp"

#endif