tanh_exponential_function.hpp

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#ifndef MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_TANH_EXPONENTIAL_FUNCTION_HPP
#define MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_TANH_EXPONENTIAL_FUNCTION_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace ann  {

class TanhExpFunction
{
 public:
  static double Fn(const double x)
  {
    return x * std::tanh(std::exp(x));
  }

  template<typename InputVecType, typename OutputVecType>
  static void Fn(const InputVecType& x, OutputVecType& y)
  {
    y = x % arma::tanh(arma::exp(x));
  }

  static double Deriv(const double y)
  {
    return std::tanh(std::exp(y)) - y * std::exp(y) *
        (std::pow(std::tanh(std::exp(y)), 2) - 1);
  }

  template<typename InputVecType, typename OutputVecType>
  static void Deriv(const InputVecType& y, OutputVecType& x)
  {
    x = arma::tanh(arma::exp(y)) - y % arma::exp(y) %
        (arma::pow(arma::tanh(arma::exp(y)), 2) - 1);
  }
}; // class TanhExpFunction

} // namespace ann
} // namespace mlpack

#endif