org.encog.ml.ea.opp.selection
Class TournamentSelection

java.lang.Object
  org.encog.ml.ea.opp.selection.TournamentSelection

All Implemented Interfaces:

Serializable, SelectionOperator

public class TournamentSelection
extends Object
implements SelectionOperator, Serializable

Tournament select can be used to select a fit (or unfit) genome from a species. The selection is run a set number of rounds. Each round two random participants are chosen. The more fit participant continues to the next round. http://en.wikipedia.org/wiki/Tournament_selection

See Also:

Serialized Form

Constructor Summary

TournamentSelection(EvolutionaryAlgorithm theTrainer, int theRounds)
Construct a tournament selection.

Method Summary

int	getRounds()
EvolutionaryAlgorithm	getTrainer()
int	performAntiSelection(Random rnd, Species species) Selects an unfit genome.
int	performSelection(Random rnd, Species species) Selects an fit genome.
void	setRounds(int rounds) Set the number of rounds.
void	setTrainer(EvolutionaryAlgorithm trainer) Set the trainer.

Methods inherited from class java.lang.Object

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

Constructor Detail

TournamentSelection

public TournamentSelection(EvolutionaryAlgorithm theTrainer,
                           int theRounds)

Construct a tournament selection.

Parameters:

theTrainer - The trainer.

theRounds - The number of rounds to use.

Method Detail

getRounds

public int getRounds()

Returns:

The number of rounds.

getTrainer

public EvolutionaryAlgorithm getTrainer()

Specified by:

getTrainer in interface SelectionOperator

Returns:

The trainer being used.

performAntiSelection

public int performAntiSelection(Random rnd,
                                Species species)

Selects an unfit genome.

Specified by:

performAntiSelection in interface SelectionOperator

Parameters:

rnd - A random number generator.

species - The species to select the genome from.

Returns:

The selected genome.

performSelection

public int performSelection(Random rnd,
                            Species species)

Selects an fit genome.

Specified by:

performSelection in interface SelectionOperator

Parameters:

rnd - A random number generator.

species - The species to select the genome from.

Returns:

The selected genome.

setRounds

public void setRounds(int rounds)

Set the number of rounds.

Parameters:

rounds - The number of rounds.

setTrainer

public void setTrainer(EvolutionaryAlgorithm trainer)

Set the trainer.

Parameters:

trainer - The trainer.