edu.udo.cs.yale.tools.math.optimization.ec.es
Class VarianceAdaption

java.lang.Object
  edu.udo.cs.yale.tools.math.optimization.ec.es.VarianceAdaption

All Implemented Interfaces:

PopulationOperator

public class VarianceAdaption
extends java.lang.Object
implements PopulationOperator

Implements the 1/5-Rule for dynamic parameter adaption of the variance of a GaussianMutation. The interval size should have the same size as the changable components, i.e. the number of examples (alphas).

Version:

$Id: VarianceAdaption.java,v 1.2 2006/08/25 21:54:42 ingomierswa Exp $

Author:

Ingo Mierswa

Field Summary

private static double	FACTOR Used factor for shrinking and enlarging.
private int	intervalSize The interval size in which the new variance is calculated.
private GaussianMutation	mutation The mutation.
private java.util.LinkedList<java.lang.Boolean>	successList Remember for all positions if an improval was found.
private static int	WAIT_INTERVALS Waits this number of intervals before variance adaption is applied.

Constructor Summary

VarianceAdaption(GaussianMutation mutation, int intervalSize)
The interval size should be as big as the changeable components, i.e. the number of examples (alphas).

Method Summary

void	operate(Population population)

Methods inherited from class java.lang.Object

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

Field Detail

WAIT_INTERVALS

private static final int WAIT_INTERVALS

Waits this number of intervals before variance adaption is applied. Usually 10.

See Also:

Constant Field Values

FACTOR

private static final double FACTOR

Used factor for shrinking and enlarging. Usually 0.85.

See Also:

Constant Field Values

mutation

private GaussianMutation mutation

The mutation.

intervalSize

private int intervalSize

The interval size in which the new variance is calculated.

successList

private java.util.LinkedList<java.lang.Boolean> successList

Remember for all positions if an improval was found.

Constructor Detail

VarianceAdaption

public VarianceAdaption(GaussianMutation mutation,
                        int intervalSize)

The interval size should be as big as the changeable components, i.e. the number of examples (alphas).

Method Detail

operate

public void operate(Population population)

Specified by:

operate in interface PopulationOperator