Package ec.multiobjective

Class HypervolumeStatistics

java.lang.Object

ec.Statistics

ec.simple.SimpleStatistics

ec.multiobjective.HypervolumeStatistics

All Implemented Interfaces:

Setup, Singleton, SteadyStateStatisticsForm, Serializable

public class HypervolumeStatistics
extends SimpleStatistics

Measures the hypervolume of a population's Pareto front. Our implementation follows the WFG algorithm, described in Lyndon While, Lucas Bradstreet, and Luigi Barone, "A Fast Way of Calculating Exact Hypervolumes," IEEE Transactions on Evolutionary Computation, 16 (1), February, 2012.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final String	P_REFERENCE_POINT

Fields inherited from class ec.simple.SimpleStatistics

best_of_run, compress, doDescription, doFinal, doGeneration, doMessage, doPerGenerationDescription, P_COMPRESS, P_DO_DESCRIPTION, P_DO_FINAL, P_DO_GENERATION, P_DO_MESSAGE, P_DO_PER_GENERATION_DESCRIPTION, P_STATISTICS_FILE, statisticslog

Fields inherited from class ec.Statistics

children, P_CHILD, P_MUZZLE, P_NUMCHILDREN, P_SILENT, P_SILENT_FILE, P_SILENT_PRINT, silentFile, silentPrint

Constructor Summary

Constructors

Constructor	Description
HypervolumeStatistics()

Method Summary

Modifier and Type	Method	Description
void	finalStatistics(EvolutionState state, int result)	Logs the best individual of the run.
double[]	getReferencePoint()
double	hypervolume(ArrayList<Individual> paretoFront)	Compute the hypervolume of the Pareto front induced by a collection of points, relative to the reference point that was provided to this class's setup() method.
static double	hypervolume(ArrayList<Individual> paretoFront, double[] referencePoint)	Compute the hypervolume of the Pareto front induced by a collection of points, relative to the provided reference point.
double	inclusiveHypervolume(Individual ind)	Compute the hypervolume covered by a single individual, relative to the reference point that was provided to this class's setup() method.
static double	inclusiveHypervolume(Individual ind, double[] referencePoint)	Compute the hypervolume covered by a single individual, relative to the provided reference point.
void	postEvaluationStatistics(EvolutionState state)	GENERATIONAL: Called immediately after evaluation occurs.
void	setup(EvolutionState state, Parameter base)	Sets up the object by reading it from the parameters stored in state, built off of the parameter base base.

Methods inherited from class ec.simple.SimpleStatistics

bypassFinalStatistics, bypassPostEvaluationStatistics, getBestSoFar, postInitializationStatistics

Methods inherited from class ec.Statistics

enteringInitialPopulationStatistics, enteringSteadyStateStatistics, generationBoundaryStatistics, individualsBredStatistics, individualsEvaluatedStatistics, postBreedingStatistics, postCheckpointStatistics, postPostBreedingExchangeStatistics, postPreBreedingExchangeStatistics, preBreedingStatistics, preCheckpointStatistics, preEvaluationStatistics, preInitializationStatistics, prePostBreedingExchangeStatistics, prePreBreedingExchangeStatistics

Methods inherited from class java.lang.Object

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

Methods inherited from interface ec.steadystate.SteadyStateStatisticsForm

enteringInitialPopulationStatistics, enteringSteadyStateStatistics, generationBoundaryStatistics, individualsBredStatistics, individualsEvaluatedStatistics, postCheckpointStatistics, postPostBreedingExchangeStatistics, postPreBreedingExchangeStatistics, preCheckpointStatistics, prePostBreedingExchangeStatistics, prePreBreedingExchangeStatistics

Field Details

P_REFERENCE_POINT

public static final String P_REFERENCE_POINT

See Also:

• Constant Field Values

Constructor Details

HypervolumeStatistics

public HypervolumeStatistics()

Method Details

getReferencePoint

public double[] getReferencePoint()

setup

public void setup(EvolutionState state,
 Parameter base)

Description copied from interface: Setup

Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. If an ancestor implements this method, be sure to call super.setup(state,base); before you do anything else.

Specified by:

setup in interface Setup

Overrides:

setup in class SimpleStatistics

postEvaluationStatistics

public void postEvaluationStatistics(EvolutionState state)

Description copied from class: Statistics

GENERATIONAL: Called immediately after evaluation occurs.

Overrides:

postEvaluationStatistics in class SimpleStatistics

hypervolume

public double hypervolume(ArrayList<Individual> paretoFront)

Compute the hypervolume of the Pareto front induced by a collection of points, relative to the reference point that was provided to this class's setup() method.

hypervolume

public static double hypervolume(ArrayList<Individual> paretoFront,
 double[] referencePoint)

Compute the hypervolume of the Pareto front induced by a collection of points, relative to the provided reference point.

inclusiveHypervolume

public double inclusiveHypervolume(Individual ind)

Compute the hypervolume covered by a single individual, relative to the reference point that was provided to this class's setup() method.

inclusiveHypervolume

public static double inclusiveHypervolume(Individual ind,
 double[] referencePoint)

Compute the hypervolume covered by a single individual, relative to the provided reference point.

finalStatistics

public void finalStatistics(EvolutionState state,
 int result)

Logs the best individual of the run.

Specified by:

finalStatistics in interface SteadyStateStatisticsForm

Overrides:

finalStatistics in class SimpleStatistics