gaussian_function.hpp

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#ifndef MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_GAUSSIAN_FUNCTION_HPP
#define MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_GAUSSIAN_FUNCTION_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace ann  {

class GaussianFunction
{
 public:
  template<typename eT>
  static double Fn(const eT x)
  {
    return std::exp(-1 * std::pow(x, 2));
  }

  template<typename InputVecType, typename OutputVecType>
  static void Fn(const InputVecType& x, OutputVecType& y)
  {
    y = arma::exp(-1 * arma::pow(x, 2));
  }

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

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

} // namespace ann
} // namespace mlpack

#endif