Package org.moeaframework.core.fitness

Class HypervolumeFitnessEvaluator

java.lang.Object

org.moeaframework.core.fitness.IndicatorFitnessEvaluator

org.moeaframework.core.fitness.HypervolumeFitnessEvaluator

All Implemented Interfaces:

FitnessEvaluator

public class HypervolumeFitnessEvaluator
extends IndicatorFitnessEvaluator

Indicator-based fitness using the hypervolume metric.

Field Summary

Fields

Modifier and Type	Field	Description
static final double	rho	Determines the reference point for the hypervolume metric.

Constructor Summary

Constructors

Constructor	Description
HypervolumeFitnessEvaluator(Problem problem)	Constructs a hypervolume fitness evaluator.

Method Summary

Modifier and Type	Method	Description
boolean	areLargerValuesPreferred()	Returns true if larger fitness values are preferred; otherwise smaller fitness values are preferred.
double	calculateHypervolume(Solution solution1, Solution solution2, int d)	Calculates the hypervolume of the portion of the objective space that is dominated by solution1 but not by solution2.
protected double	calculateIndicator(Solution solution1, Solution solution2)	Returns the indicator value relative to the two solutions.

Methods inherited from class org.moeaframework.core.fitness.IndicatorFitnessEvaluator

evaluate, getProblem, removeAndUpdate

Methods inherited from class java.lang.Object

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

Field Details

rho

public static final double rho

Determines the reference point for the hypervolume metric. Larger fitness values are worse!

See Also:

• Constant Field Values

Constructor Details

HypervolumeFitnessEvaluator

public HypervolumeFitnessEvaluator(Problem problem)

Constructs a hypervolume fitness evaluator.

Parameters:

problem - the problem

Method Details

calculateIndicator

protected double calculateIndicator(Solution solution1,
 Solution solution2)

Description copied from class: IndicatorFitnessEvaluator

Returns the indicator value relative to the two solutions.

Specified by:

calculateIndicator in class IndicatorFitnessEvaluator

Parameters:

solution1 - the first solution

solution2 - the second solution

Returns:

the indicator value relative to the two solutions

calculateHypervolume

public double calculateHypervolume(Solution solution1,
 Solution solution2,
 int d)

Calculates the hypervolume of the portion of the objective space that is dominated by solution1 but not by solution2.

Parameters:

solution1 - the first solution

solution2 - the second solution

d - the current objective

Returns:

the hypervolume of the portion of the objective space that is dominated by solution1 but not by solution2.

areLargerValuesPreferred

public boolean areLargerValuesPreferred()

Description copied from interface: FitnessEvaluator

Returns true if larger fitness values are preferred; otherwise smaller fitness values are preferred.

Returns:

true if larger fitness values are preferred; otherwise smaller fitness values are preferred