org.jgap.impl

Class TournamentSelector

java.lang.Object

org.jgap.NaturalSelector

org.jgap.NaturalSelectorExt

org.jgap.impl.TournamentSelector

All Implemented Interfaces:

java.io.Serializable, Configurable, INaturalSelector

public class TournamentSelector
extends NaturalSelectorExt

Implementation of a NaturalSelector that plays tournaments to determine the chromosomes to be taken to the next generation.

The tournament size can be adjusted as well as the probability for selecting an individual.

Since:

2.0

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.jgap.NaturalSelector

NaturalSelector.AgeFitnessValueComparator, NaturalSelector.FitnessAgeValueComparator

Constructor Summary

Constructors

Constructor and Description
TournamentSelector() Default constructor.
TournamentSelector(Configuration a_config, int a_tournament_size, double a_probability)

Method Summary

Modifier and Type	Method and Description
void	empty() Empty out the working pool of Chromosomes.
double	getProbability()
int	getTournamentSize()
boolean	returnsUniqueChromosomes()
void	selectChromosomes(int a_howManyToSelect, Population a_to_pop) Select a given number of Chromosomes from the pool that will move on to the next generation population.
void	setProbability(double a_probability)
void	setTournamentSize(int a_tournament_size)

Methods inherited from class org.jgap.NaturalSelectorExt

equals, getDoubletteChromosomesAllowed, select, setDoubletteChromosomesAllowed

Methods inherited from class org.jgap.NaturalSelector

getConfiguration

Methods inherited from class java.lang.Object

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

Constructor Detail

TournamentSelector

public TournamentSelector()
                   throws InvalidConfigurationException

Default constructor.

Attention: The configuration used is the one set with the static method Genotype.setConfiguration.

Throws:

InvalidConfigurationException

TournamentSelector

public TournamentSelector(Configuration a_config,
                          int a_tournament_size,
                          double a_probability)
                   throws InvalidConfigurationException

Parameters:

a_config - the configuration to use

a_tournament_size - the size of each tournament to play

a_probability - probability for selecting the best individuals

Throws:

InvalidConfigurationException

Since:

2.0

Method Detail

setTournamentSize

public void setTournamentSize(int a_tournament_size)

getTournamentSize

public int getTournamentSize()

getProbability

public double getProbability()

setProbability

public void setProbability(double a_probability)

selectChromosomes

public void selectChromosomes(int a_howManyToSelect,
                              Population a_to_pop)

Select a given number of Chromosomes from the pool that will move on to the next generation population. This selection will be guided by the fitness values. The chromosomes with the best fitness value win.

Parameters:

a_howManyToSelect - int

a_to_pop - the population the Chromosomes will be added to

Since:

2.0

returnsUniqueChromosomes

public boolean returnsUniqueChromosomes()

Returns:

false as we allow to return the same chromosome multiple times

Since:

2.0

empty

public void empty()

Description copied from interface: INaturalSelector

Empty out the working pool of Chromosomes. This will be invoked after each evolution cycle so that the natural selector can be reused for the next one.