shark::FastSigmoidNeuron Struct Reference

Fast sigmoidal function, which does not need to compute an exponential function. More...

#include <shark/Models/NeuronLayers.h>

Public Types
typedef EmptyState	State

Public Member Functions
template<class Arg >
void	evalInPlace (Arg &arg) const
template<class Arg >
void	evalInPlace (Arg &arg, State &) const
template<class Output , class Derivative >
void	multiplyDerivative (Output const &output, Derivative &der, State const &state) const

Detailed Description

Fast sigmoidal function, which does not need to compute an exponential function.

It is defined as

\[ f(x)=\frac x {1+|x|}\]

it's derivative can be computed as

\[ f'(x)= (1 - |f(x)|)^2 \]

Definition at line 92 of file NeuronLayers.h.

Member Typedef Documentation

State

typedef EmptyState shark::FastSigmoidNeuron::State

Definition at line 93 of file NeuronLayers.h.

Member Function Documentation

evalInPlace() [1/2]

template<class Arg >

void shark::FastSigmoidNeuron::evalInPlace ( Arg &  arg ) const

inline

Definition at line 95 of file NeuronLayers.h.

evalInPlace() [2/2]

template<class Arg >

void shark::FastSigmoidNeuron::evalInPlace ( Arg &  arg, State &    ) const

inline

Definition at line 100 of file NeuronLayers.h.

References shark::TanhNeuron::evalInPlace().

multiplyDerivative()

template<class Output , class Derivative >

void shark::FastSigmoidNeuron::multiplyDerivative ( Output const &  output, Derivative &  der, State const &  state  ) const

inline

Definition at line 105 of file NeuronLayers.h.

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The documentation for this struct was generated from the following file:

• include/shark/Models/NeuronLayers.h