tanh_function.hpp
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1 
12 #ifndef MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_TANH_FUNCTION_HPP
13 #define MLPACK_METHODS_ANN_ACTIVATION_FUNCTIONS_TANH_FUNCTION_HPP
14 
15 #include <mlpack/prereqs.hpp>
16 
17 namespace mlpack {
18 namespace ann {
19 
30 {
31  public:
38  static double Fn(const double x)
39  {
40  return std::tanh(x);
41  }
42 
49  template<typename InputVecType, typename OutputVecType>
50  static void Fn(const InputVecType& x, OutputVecType& y)
51  {
52  y = arma::tanh(x);
53  }
54 
61  static double Deriv(const double y)
62  {
63  return 1 - std::pow(y, 2);
64  }
65 
72  template<typename InputVecType, typename OutputVecType>
73  static void Deriv(const InputVecType& y, OutputVecType& x)
74  {
75  x = 1 - arma::pow(y, 2);
76  }
77 
84  static double Inv(const double y)
85  {
86  return std::atanh(y);
87  }
88 
95  template<typename InputVecType, typename OutputVecType>
96  static void Inv(const InputVecType& y, OutputVecType& x)
97  {
98  x = arma::atanh(y);
99  }
100 }; // class TanhFunction
101 
102 } // namespace ann
103 } // namespace mlpack
104 
105 #endif
static void Inv(const InputVecType &y, OutputVecType &x)
Computes the inverse of the tanh function.
static void Fn(const InputVecType &x, OutputVecType &y)
Computes the tanh function.
The tanh function, defined by.
.hpp
Definition: add_to_po.hpp:21
The core includes that mlpack expects; standard C++ includes and Armadillo.
static double Deriv(const double y)
Computes the first derivative of the tanh function.
static double Inv(const double y)
Computes the inverse of the tanh function.
static double Fn(const double x)
Computes the tanh function.
static void Deriv(const InputVecType &y, OutputVecType &x)
Computes the first derivatives of the tanh function.