weka.classifiers.functions.activation

Class Sigmoid

java.lang.Object

weka.classifiers.functions.activation.Sigmoid

All Implemented Interfaces:

java.io.Serializable, ActivationFunction

public class Sigmoid
extends java.lang.Object
implements ActivationFunction

Computes sigmoid activation function f(x) = 1 / (1 + e^(-x))

Version:

$Revision: 10949 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Sigmoid()

Method Summary

Modifier and Type	Method and Description
double	activation(double x, double[] d, int index) Computes sigmoid function.
java.lang.String	globalInfo() Returns info for this class.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Sigmoid

public Sigmoid()

Method Detail

globalInfo

public java.lang.String globalInfo()

Returns info for this class.

activation

public double activation(double x,
                         double[] d,
                         int index)

Computes sigmoid function. Derivative is stored in d at position index if argument d != null.

Specified by:

activation in interface ActivationFunction