edu.udo.cs.yale.operator.features.construction
Class DirectedGeneratingMutation

java.lang.Object
  edu.udo.cs.yale.operator.features.IndividualOperator
      edu.udo.cs.yale.operator.features.construction.DirectedGeneratingMutation

All Implemented Interfaces:

PopulationOperator

public class DirectedGeneratingMutation
extends IndividualOperator

The mutation operator for directed GGAs. This operator adds single attributes from the original set, creates new ones and deselect single attributes. The number of attributes remains until longer or shorter example sets have proven to perform better.

Version:

$Id: DirectedGeneratingMutation.java,v 1.1 2006/04/14 07:47:17 ingomierswa Exp $

Author:

Ingo Mierswa

See Also:

DirectedGGA

Field Summary

private java.util.List	generators
private int	maxAddedOriginalAttributes
private int	maxDepth
private int	maxGeneratedAttributes
private Attribute[]	originalAttributes
private double	p
private RandomGenerator	random
private java.lang.String[]	unusableFunctions

Constructor Summary

DirectedGeneratingMutation(Attribute[] originalAttributes, double p, java.util.List generators, int maxGeneratedAttributes, int maxAddedOriginalAttributes, int maxDepth, java.lang.String[] unusableFunctions, RandomGenerator random)

Method Summary

private void	addGeneratedAttribute(AttributeWeightedExampleSet exampleSet)
private void	addOriginalAttribute(AttributeWeightedExampleSet exampleSet)
private void	deselect(AttributeWeightedExampleSet exampleSet, int numberNew)
java.util.List<Individual>	operate(Individual individual) Performs one of the following three mutations: add a newly generated attribute add an original attribute remove an attribute

Methods inherited from class edu.udo.cs.yale.operator.features.IndividualOperator

operate, performOperation

Methods inherited from class java.lang.Object

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

Field Detail

generators

private java.util.List generators

originalAttributes

private Attribute[] originalAttributes

p

private double p

maxGeneratedAttributes

private int maxGeneratedAttributes

maxAddedOriginalAttributes

private int maxAddedOriginalAttributes

maxDepth

private int maxDepth

unusableFunctions

private java.lang.String[] unusableFunctions

random

private RandomGenerator random

Constructor Detail

DirectedGeneratingMutation

public DirectedGeneratingMutation(Attribute[] originalAttributes,
                                  double p,
                                  java.util.List generators,
                                  int maxGeneratedAttributes,
                                  int maxAddedOriginalAttributes,
                                  int maxDepth,
                                  java.lang.String[] unusableFunctions,
                                  RandomGenerator random)

Method Detail

operate

public java.util.List<Individual> operate(Individual individual)
                                   throws java.lang.Exception

Performs one of the following three mutations:

• add a newly generated attribute
• add an original attribute
• remove an attribute

Specified by:

operate in class IndividualOperator

Throws:

java.lang.Exception

addGeneratedAttribute

private void addGeneratedAttribute(AttributeWeightedExampleSet exampleSet)
                            throws GenerationException

Throws:

GenerationException

addOriginalAttribute

private void addOriginalAttribute(AttributeWeightedExampleSet exampleSet)

deselect

private void deselect(AttributeWeightedExampleSet exampleSet,
                      int numberNew)