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

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

All Implemented Interfaces:

PopulationOperator

public class AttributeGenerator
extends IndividualOperator

This PopulationOperator generates new attributes in an individual's example table. Given a generation probability pGenerate

and the maximal number of new attributes it generates on average pGenerate * numberOfNewAttributes new attributes using generators from the list generatorList
This operator can never handle value series but only single attributes.

Version:

$Id: AttributeGenerator.java,v 1.6 2006/09/02 12:14:10 ingomierswa Exp $

Author:

Ingo Mierswa

Field Summary

private java.util.List<FeatureGenerator>	generatorList A list of applicable generators.
private int	numberOfNewAttributes Maximal number of newly generated attributes.
private double	pGenerate Probability to generate a new attribute.
private RandomGenerator	random
private int	totalMaxNumberOfAttributes The total maximum number of new attributes.

Constructor Summary

AttributeGenerator(double pGenerate, int numberOfNewAttributes, int totalMaxNumberOfAttributes, java.util.List<FeatureGenerator> generatorList, RandomGenerator random)
Creates a new AttributeGenerator with given parameters.

Method Summary

java.util.List<Individual>

operate(Individual individual) Determines the applicable generators and generates up to numberOfNewAttributes new attributes.

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

pGenerate

private double pGenerate

Probability to generate a new attribute.

numberOfNewAttributes

private int numberOfNewAttributes

Maximal number of newly generated attributes.

totalMaxNumberOfAttributes

private int totalMaxNumberOfAttributes

The total maximum number of new attributes.

generatorList

private java.util.List<FeatureGenerator> generatorList

A list of applicable generators.

random

private RandomGenerator random

Constructor Detail

AttributeGenerator

public AttributeGenerator(double pGenerate,
                          int numberOfNewAttributes,
                          int totalMaxNumberOfAttributes,
                          java.util.List<FeatureGenerator> generatorList,
                          RandomGenerator random)

Creates a new AttributeGenerator with given parameters.

Method Detail

operate

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

Determines the applicable generators and generates up to numberOfNewAttributes new attributes.

Specified by:

operate in class IndividualOperator

Throws:

java.lang.Exception