ec.es

Class MuPlusLambdaBreeder

java.lang.Object

ec.Breeder

ec.es.MuCommaLambdaBreeder

ec.es.MuPlusLambdaBreeder

All Implemented Interfaces:

Setup, Singleton, java.io.Serializable

public class MuPlusLambdaBreeder
extends MuCommaLambdaBreeder

MuPlusLambdaBreeder is a subclass of MuCommaLambdaBreeder which, together with ESSelection, implements the (mu + lambda) breeding strategy and gathers the comparison data you can use to implement a 1/5-rule mutation mechanism. Note that MuPlusLambdaBreeder increases subpopulation sizes by their mu values in the second generation and keep them at that size thereafter. See MuCommaLambdaBreeder for information about how to set mu and lambda.

See Also:

Serialized Form

Field Summary

Fields inherited from class ec.es.MuCommaLambdaBreeder

C_EXACTLY_ONE_FIFTH_BETTER, C_OVER_ONE_FIFTH_BETTER, C_UNDER_ONE_FIFTH_BETTER, comparison, count, lambda, mu, P_LAMBDA, P_MU, P_MU_FRACTION, parentPopulation

Constructor Summary

Constructors

Constructor and Description
MuPlusLambdaBreeder()

Method Summary

Modifier and Type	Method and Description
int	maximumMuLambdaDivisor() lambda should be no SMALLER than mu times this value.
Population	postProcess(Population newpop, Population oldpop, EvolutionState state) A hook for Mu+Lambda, not used in Mu,Lambda
Population	setToMuPlusLambda(Population pop, EvolutionState state) Sets all subpopulations in pop to the expected mu+lambda size.

Methods inherited from class ec.es.MuCommaLambdaBreeder

breedPopChunk, breedPopulation, setToLambda, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

MuPlusLambdaBreeder

public MuPlusLambdaBreeder()

Method Detail

maximumMuLambdaDivisor

public int maximumMuLambdaDivisor()

Description copied from class: MuCommaLambdaBreeder

lambda should be no SMALLER than mu times this value. This varies between (mu,lambda) (where it's 2) and (mu + lambda) (where it's 1).

Overrides:

maximumMuLambdaDivisor in class MuCommaLambdaBreeder

setToMuPlusLambda

public Population setToMuPlusLambda(Population pop,
                                    EvolutionState state)

Sets all subpopulations in pop to the expected mu+lambda size. Does not fill new slots with individuals.

postProcess

public Population postProcess(Population newpop,
                              Population oldpop,
                              EvolutionState state)

Description copied from class: MuCommaLambdaBreeder

A hook for Mu+Lambda, not used in Mu,Lambda

Overrides:

postProcess in class MuCommaLambdaBreeder