org.encog.ml.ea.opp.selection

Class TruncationSelection

java.lang.Object

org.encog.ml.ea.opp.selection.TruncationSelection

All Implemented Interfaces:

java.io.Serializable, SelectionOperator

public class TruncationSelection
extends java.lang.Object
implements SelectionOperator, java.io.Serializable

Truncation selection chooses a random genome from the top genomes in the population. A percent determines how large this group of top genomes is. http://en.wikipedia.org/wiki/Truncation_selection

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TruncationSelection(EvolutionaryAlgorithm theTrainer, double thePercent) Construct the truncation selector.

Method Summary

Modifier and Type	Method and Description
EvolutionaryAlgorithm	getTrainer()
int	performAntiSelection(java.util.Random rnd, Species species) Selects an unfit genome.
int	performSelection(java.util.Random rnd, Species species) Selects an fit genome.

Methods inherited from class java.lang.Object

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

Constructor Detail

TruncationSelection

public TruncationSelection(EvolutionaryAlgorithm theTrainer,
                           double thePercent)

Construct the truncation selector.

Parameters:

theTrainer - The trainer.

thePercent - The top percent to select from.

Method Detail

performSelection

public int performSelection(java.util.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.

performAntiSelection

public int performAntiSelection(java.util.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.

getTrainer

public EvolutionaryAlgorithm getTrainer()

Specified by:

getTrainer in interface SelectionOperator

Returns:

The trainer being used.