org.opt4j.optimizer.ea

Class Hypervolume

java.lang.Object

org.opt4j.optimizer.ea.Hypervolume

All Implemented Interfaces:

FrontDensityIndicator

public class Hypervolume
extends Object
implements FrontDensityIndicator

The Hypervolume is a FrontDensityIndicator based on determination of the hypervolume contribution. The calculation is based on a normalization between 0 and 1 in each dimension and a transformation to a maximization problem. Additionally an offset values (default 1) is added to each dimension.

Author:

Ramin Etemaadi, Johannes Kruisselbrink, Rui Li, lukasiewycz

See Also:

SMSModule, "Zitzler, E., and Thiele, L. (1998): Multiobjective Optimization Using Evolutionary Algorithms - A Comparative Case Study. Parallel Problem Solving from Nature (PPSN-V), 292-301."

Constructor Summary

Constructors

Constructor and Description
Hypervolume(double offset) Constructs a Hypervolume.

Method Summary

Modifier and Type	Method and Description
Map<Individual,Double>	getDensityValues(Collection<Individual> individuals) Returns the density values for a collection on Individuals.

Methods inherited from class java.lang.Object

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

Constructor Detail

Hypervolume

@Inject
public Hypervolume(double offset)

Constructs a Hypervolume.

Parameters:

offset - the offset that is added to each dimension before the hypervolume is calculated

Method Detail

getDensityValues

public Map<Individual,Double> getDensityValues(Collection<Individual> individuals)

Description copied from interface: FrontDensityIndicator

Returns the density values for a collection on Individuals.

Specified by:

getDensityValues in interface FrontDensityIndicator

Parameters:

individuals - the individuals

Returns:

a map of each individual to its density value