ec

Class SelectionMethod

java.lang.Object

ec.BreedingSource

ec.SelectionMethod

All Implemented Interfaces:

Prototype, Setup, RandomChoiceChooserD, Serializable, Cloneable

Direct Known Subclasses:

BestSelection, BucketTournamentSelection, DoubleTournamentSelection, ESSelection, FirstSelection, FitProportionateSelection, GreedyOverselection, MultiSelection, OurSelection, RandomSelection, RatioBucketTournamentSelection, SUSSelection, TournamentSelection

public abstract class SelectionMethod
extends BreedingSource

A SelectionMethod is a BreedingSource which provides direct IMMUTABLE pointers to original individuals in an old population, not fresh mutable copies. If you use a SelectionMethod as your BreedingSource, you must SelectionMethods might include Tournament Selection, Fitness Proportional Selection, etc. SelectionMethods don't have parent sources.

Typical Number of Individuals Produced Per produce(...) call
Always 1.

Version:

1.0

Author:

Sean Luke

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	INDS_PRODUCED

Fields inherited from class ec.BreedingSource

NO_PROBABILITY, P_PROB, probability

Constructor Summary

Constructors

Constructor and Description
SelectionMethod()

Method Summary

Methods

Modifier and Type	Method and Description
void	finishProducing(EvolutionState s, int subpopulation, int thread) A default version of finishProducing, which does nothing.
void	prepareToProduce(EvolutionState s, int subpopulation, int thread) A default version of prepareToProduce which does nothing.
abstract int	produce(int subpopulation, EvolutionState state, int thread) An alternative form of "produce" special to Selection Methods; selects an individual from the given subpopulation and returns its position in that subpopulation.
int	produce(int min, int max, int start, int subpopulation, Individual[] inds, EvolutionState state, int thread) Produces n individuals from the given subpopulation and puts them into inds[start...start+n-1], where n = Min(Max(q,min),max), where q is the "typical" number of individuals the BreedingSource produces in one shot, and returns n.
boolean	produces(EvolutionState state, Population newpop, int subpopulation, int thread) A default version of produces -- this method always returns true under the assumption that the selection method works with all Fitnesses.
int	typicalIndsProduced() Returns 1 (the typical default value)

Methods inherited from class ec.BreedingSource

clone, getProbability, pickRandom, preparePipeline, setProbability, setup, setupProbabilities

Methods inherited from class java.lang.Object

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

Methods inherited from interface ec.Prototype

defaultBase

Field Detail

INDS_PRODUCED

public static final int INDS_PRODUCED

See Also:

Constant Field Values

Constructor Detail

SelectionMethod

public SelectionMethod()

Method Detail

typicalIndsProduced

public int typicalIndsProduced()

Returns 1 (the typical default value)

Specified by:

typicalIndsProduced in class BreedingSource

produces

public boolean produces(EvolutionState state,
               Population newpop,
               int subpopulation,
               int thread)

A default version of produces -- this method always returns true under the assumption that the selection method works with all Fitnesses. If this isn't the case, you should override this to return your own assessment.

Specified by:

produces in class BreedingSource

prepareToProduce

public void prepareToProduce(EvolutionState s,
                    int subpopulation,
                    int thread)

A default version of prepareToProduce which does nothing.

Specified by:

prepareToProduce in class BreedingSource

finishProducing

public void finishProducing(EvolutionState s,
                   int subpopulation,
                   int thread)

A default version of finishProducing, which does nothing.

Specified by:

finishProducing in class BreedingSource

produce

public int produce(int min,
          int max,
          int start,
          int subpopulation,
          Individual[] inds,
          EvolutionState state,
          int thread)

Description copied from class: BreedingSource

Produces n individuals from the given subpopulation and puts them into inds[start...start+n-1], where n = Min(Max(q,min),max), where q is the "typical" number of individuals the BreedingSource produces in one shot, and returns n. max must be >= min, and min must be >= 1. For example, crossover might typically produce two individuals, tournament selection might typically produce a single individual, etc.

Specified by:

produce in class BreedingSource

produce

public abstract int produce(int subpopulation,
          EvolutionState state,
          int thread)

An alternative form of "produce" special to Selection Methods; selects an individual from the given subpopulation and returns its position in that subpopulation.