Package org.opt4j.optimizer.ea

Class ScalingNsga2

java.lang.Object

org.opt4j.optimizer.ea.AlternativeNsga2

org.opt4j.optimizer.ea.ScalingNsga2

All Implemented Interfaces:

IndividualSetListener, IndividualStateListener, Selector

public class ScalingNsga2
extends AlternativeNsga2
implements IndividualSetListener, IndividualStateListener

Latest version of NSGA-II with the dimensions scaled on the basis of the individual ranges when calculating the crowding distance as described in K. Deb, A. Pratap, S. Agarwal, and T. Meyarivan, "A fast and elitist multiobjective genetic algorithm : Nsga-ii," Evolutionary Computation, IEEETransactions on, vol. 6, no. 2, pp. 182-197, August 2002.

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<Objective,Range>	objectiveRanges

Fields inherited from class org.opt4j.optimizer.ea.AlternativeNsga2

dist, fronts, ind, m, map, random, rank, tournament

Constructor Summary

Constructors

Constructor	Description
ScalingNsga2(Rand random, int tournament, Population population)	Constructs a ScalingNsga2 Selector.

Method Summary

Modifier and Type	Method	Description
protected void	calcDistance(List<Integer> list)
void	individualAdded(IndividualSet collection, Individual individual)	Invoked if the Individual is added to the IndividualSet.
void	individualRemoved(IndividualSet collection, Individual individual)	Invoked if the Individual is removed from the IndividualSet.
void	inidividualStateChanged(Individual individual)	Invoked if the Individual changes its state.

Methods inherited from class org.opt4j.optimizer.ea.AlternativeNsga2

fronts, getLames, getParents, init, synchronize

Methods inherited from class java.lang.Object

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

Field Details

objectiveRanges

protected Map<Objective,Range> objectiveRanges

Constructor Details

ScalingNsga2

@Inject
public ScalingNsga2(Rand random,
 int tournament,
 Population population)

Constructs a ScalingNsga2 Selector.

Parameters:

random - the random number generator

tournament - the tournament value

Method Details

calcDistance

protected void calcDistance(List<Integer> list)

Overrides:

calcDistance in class AlternativeNsga2

individualAdded

public void individualAdded(IndividualSet collection,
 Individual individual)

Description copied from interface: IndividualSetListener

Invoked if the Individual is added to the IndividualSet.

Specified by:

individualAdded in interface IndividualSetListener

Parameters:

collection - the observed collection

individual - the added individual

individualRemoved

public void individualRemoved(IndividualSet collection,
 Individual individual)

Description copied from interface: IndividualSetListener

Invoked if the Individual is removed from the IndividualSet.

Specified by:

individualRemoved in interface IndividualSetListener

Parameters:

collection - the observed collection

individual - the removed individual

inidividualStateChanged

public void inidividualStateChanged(Individual individual)

Description copied from interface: IndividualStateListener

Invoked if the Individual changes its state.

Specified by:

inidividualStateChanged in interface IndividualStateListener

Parameters:

individual - the individual that changes the state