Package org.moeaframework.core.indicator

Class InvertedGenerationalDistancePlus

java.lang.Object

org.moeaframework.core.indicator.NormalizedIndicator

org.moeaframework.core.indicator.InvertedGenerationalDistancePlus

All Implemented Interfaces:

Indicator

public class InvertedGenerationalDistancePlus
extends NormalizedIndicator

Inverted generational distance plus (IGD+) indicator. The "plus" variant differs in two ways:

1. Utilizes a different distance measure to construct a weakly Pareto compliant indicator, and
2. Fixes the power to 1.0 so the result is always the average distance.

References:

1. H. Ishibuchi, H. Masuda, Y. Tanigaki and Y. Nojima, “Modified distance calculation in generational distance and inverted generational distance,” Proc. of 8th International Conference on Evolutionary Multi-Criterion Optimization, Part I, pp. 110-125, Guimarães, Portugal, March 29-April 1, 2015.

Field Summary

Fields inherited from class org.moeaframework.core.indicator.NormalizedIndicator

problem

Constructor Summary

Constructors

Constructor	Description
InvertedGenerationalDistancePlus(Problem problem, NondominatedPopulation referenceSet)	Constructs an inverted generational distance plus evaluator for the specified problem and corresponding reference set.
InvertedGenerationalDistancePlus(Problem problem, NondominatedPopulation referenceSet, Normalizer normalizer)	Constructs an inverted generational distance plus evaluator for the specified problem and corresponding reference set.

Method Summary

Modifier and Type	Method	Description
double	evaluate(NondominatedPopulation approximationSet)	Returns the value of this unary quality indicator given the specified non-dominated population.

Methods inherited from class org.moeaframework.core.indicator.NormalizedIndicator

getNormalizedReferenceSet, normalize

Methods inherited from class java.lang.Object

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

Constructor Details

InvertedGenerationalDistancePlus

public InvertedGenerationalDistancePlus(Problem problem,
 NondominatedPopulation referenceSet)

Constructs an inverted generational distance plus evaluator for the specified problem and corresponding reference set. The default normalization procedure, as specified by DefaultNormalizer, is used.

Parameters:

problem - the problem

referenceSet - the reference set for the problem

InvertedGenerationalDistancePlus

public InvertedGenerationalDistancePlus(Problem problem,
 NondominatedPopulation referenceSet,
 Normalizer normalizer)

Constructs an inverted generational distance plus evaluator for the specified problem and corresponding reference set.

Parameters:

problem - the problem

referenceSet - the reference set for the problem

normalizer - the user-provided normalizer, or null if the default is used

Method Details

evaluate

public double evaluate(NondominatedPopulation approximationSet)

Description copied from interface: Indicator

Returns the value of this unary quality indicator given the specified non-dominated population.

Parameters:

approximationSet - the non-dominated population to be evaluated

Returns:

the value of this quality indicator given the specified non-dominated population