GClasses::GActivationBiDir Class Reference

This is an output-layer activation function shaped like a sigmoid, but with both a co-domain and domain that spans the continuous values. At very negative values, this is shaped like y=-sqrt(-2x). Near zero, it is shaped like y=x. At very positive values, it is shaped like y=sqrt(2x). More...

#include <GActivation.h>

Inheritance diagram for GClasses::GActivationBiDir:

Public Member Functions
virtual double	center ()
	Returns 0.0. More...
virtual GActivationFunction *	clone ()
	See the comment for GActivationFunction::clone. More...
virtual double	derivative (double x)
	The derivative of the activation function. More...
virtual double	halfRange ()
	Returns 10000. More...
virtual double	identityBias ()
	Returns 0.0. More...
virtual double	identityDiag ()
	Returns 1.0. More...
virtual double	inverse (double y)
	The inverse of the activation function. (This function may throw an exception if the activation function cannot be inverted.) More...
virtual const char *	name () const
	Returns the name of this activation function. More...
virtual double	squash (double x)
	The activation function. More...
Public Member Functions inherited from GClasses::GActivationFunction
	GActivationFunction ()
virtual	~GActivationFunction ()
virtual double	derivativeOfNet (double net, double activation)
	This computes the derivative of the net value. (Sometimes, such as with GActivationLogistic, it is more efficient to compute this from the activation value, so both are provided.) More...
GDomNode *	serialize (GDom *pDoc) const
	Serialize this object. More...

Additional Inherited Members
Static Public Member Functions inherited from GClasses::GActivationFunction
static GActivationFunction *	deserialize (GDomNode *pNode)
	Deserialize this object. More...

Detailed Description

This is an output-layer activation function shaped like a sigmoid, but with both a co-domain and domain that spans the continuous values. At very negative values, this is shaped like y=-sqrt(-2x). Near zero, it is shaped like y=x. At very positive values, it is shaped like y=sqrt(2x).

Member Function Documentation

virtual double GClasses::GActivationBiDir::center ( )

inlinevirtual

Returns 0.0.

Implements GClasses::GActivationFunction.

virtual GActivationFunction* GClasses::GActivationBiDir::clone ( )

inlinevirtual

See the comment for GActivationFunction::clone.

Implements GClasses::GActivationFunction.

virtual double GClasses::GActivationBiDir::derivative ( double  x )

inlinevirtual

The derivative of the activation function.

Implements GClasses::GActivationFunction.

virtual double GClasses::GActivationBiDir::halfRange ( )

inlinevirtual

Returns 10000.

Implements GClasses::GActivationFunction.

virtual double GClasses::GActivationBiDir::identityBias ( )

inlinevirtual

Returns 0.0.

Implements GClasses::GActivationFunction.

virtual double GClasses::GActivationBiDir::identityDiag ( )

inlinevirtual

Returns 1.0.

Implements GClasses::GActivationFunction.

virtual double GClasses::GActivationBiDir::inverse ( double  y )

inlinevirtual

The inverse of the activation function. (This function may throw an exception if the activation function cannot be inverted.)

Implements GClasses::GActivationFunction.

virtual const char* GClasses::GActivationBiDir::name ( ) const

inlinevirtual

Returns the name of this activation function.

Implements GClasses::GActivationFunction.

virtual double GClasses::GActivationBiDir::squash ( double  x )

inlinevirtual

The activation function.

Implements GClasses::GActivationFunction.