mlpack 3.4.2
inverse_quadratic_function.hpp
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1
12#ifndef MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_INVERSE_QUAD_FUNCTION_HPP
13#define MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_INVERSE_QUAD_FUNCTION_HPP
14
15#include <mlpack/prereqs.hpp>
16
17namespace mlpack {
18namespace ann {
19
29{
30 public:
37 static double Fn(const double x)
38 {
39 return 1 / ( 1 + x * x);
40 }
41
48 template<typename InputVecType, typename OutputVecType>
49 static void Fn(const InputVecType& x, OutputVecType& y)
50 {
51 y = 1 / (1 + arma::pow(x, 2));
52 }
53
60 static double Deriv(const double y)
61 {
62 return - 2 * y / std::pow(1 + std::pow(y, 2), 2);
63 }
64
71 template<typename InputVecType, typename OutputVecType>
72 static void Deriv(const InputVecType& x, OutputVecType& y)
73 {
74 y = - 2 * x / arma::pow(1 + arma::pow(x, 2), 2);
75 }
76}; // class InvQuadFunction
77
78} // namespace ann
79} // namespace mlpack
80
81#endif
The Inverse Quadratic function, defined by.
static void Deriv(const InputVecType &x, OutputVecType &y)
Computes the first derivatives of the Inverse Quadratic function.
static double Fn(const double x)
Computes the Inverse Quadratic function.
static double Deriv(const double y)
Computes the first derivative of the Inverse Quadratic function.
static void Fn(const InputVecType &x, OutputVecType &y)
Computes the Inverse Quadratic function.
Linear algebra utility functions, generally performed on matrices or vectors.
Definition: cv.hpp:1
The core includes that mlpack expects; standard C++ includes and Armadillo.