ec.multiobjective.spea2
Class SPEA2MultiObjectiveFitness

java.lang.Object
  ec.multiobjective.MultiObjectiveFitness
      ec.multiobjective.spea2.SPEA2MultiObjectiveFitness

All Implemented Interfaces:

java.lang.Cloneable, Fitness, Prototype, java.io.Serializable, Setup

public class SPEA2MultiObjectiveFitness

extends MultiObjectiveFitness

SPEA2MultiObjectiveFitness is a subclass of Fitness which implements basic multiobjective fitness functions along with support for the ECJ SPEA2 (Strength Pareto Evolutionary Algorithm) extensions.

The object contains two items: an array of floating point values representing the various multiple fitnesses (ranging from 0.0 (worst) to infinity (best)), and a single SPEA2 fitness value which represents the individual's overall fitness ( a function of the number of individuals it dominates and it's raw score where 0.0 is the best).

Parameters

base.numobjectives (else)multi.numobjectives int >= 1

(the number of fitnesses in the multifitness array)

See Also:

Serialized Form

Field Summary

static java.lang.String	SPEA2FIT_PREAMBLE
double	SPEA2Fitness SPEA2 overall fitness
double	SPEA2kthNNDistance SPEA2 NN distance
double	SPEA2RawFitness SPEA2 RAW fitness
double	SPEA2Strength SPEA2 strength (# of nodes it dominates)

Fields inherited from class ec.multiobjective.MultiObjectiveFitness

FITNESS_POSTAMBLE, FITNESS_PREAMBLE, multifitness, P_FITNESS, P_NUMFITNESSES

Constructor Summary

SPEA2MultiObjectiveFitness()

Method Summary

float	calcDistance(SPEA2MultiObjectiveFitness otherFit) Returns the sum of the squared differences between the vector fitness values.
void	printFitness(EvolutionState state, int log, int verbosity) Prints the fitness in the computer-readable form:
void	printFitness(EvolutionState state, java.io.PrintWriter writer) Prints the fitness in the computer-readable form:
void	printFitnessForHumans(EvolutionState state, int log, int verbosity) Prints the fitness in the human-readable form:
void	readFitness(EvolutionState state, java.io.LineNumberReader reader) Reads in the fitness from a form printed by printFitness().

Methods inherited from class ec.multiobjective.MultiObjectiveFitness

betterThan, defaultBase, equivalentTo, fitness, isIdealFitness, protoClone, protoCloneSimple, setup

Methods inherited from class java.lang.Object

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

Field Detail

SPEA2FIT_PREAMBLE

public static final java.lang.String SPEA2FIT_PREAMBLE

See Also:

Constant Field Values

SPEA2Fitness

public double SPEA2Fitness

SPEA2 overall fitness

SPEA2Strength

public double SPEA2Strength

SPEA2 strength (# of nodes it dominates)

SPEA2RawFitness

public double SPEA2RawFitness

SPEA2 RAW fitness

SPEA2kthNNDistance

public double SPEA2kthNNDistance

SPEA2 NN distance

Constructor Detail

SPEA2MultiObjectiveFitness

public SPEA2MultiObjectiveFitness()

Method Detail

calcDistance

public float calcDistance(SPEA2MultiObjectiveFitness otherFit)

Returns the sum of the squared differences between the vector fitness values.

printFitness

public void printFitness(EvolutionState state,
                         int log,
                         int verbosity)

Prints the fitness in the computer-readable form:

Fitness: [fitness values encoded with ec.util.Code, separated by spaces]

Specified by:

printFitness in interface Fitness

Overrides:

printFitness in class MultiObjectiveFitness

printFitness

public void printFitness(EvolutionState state,
                         java.io.PrintWriter writer)

Prints the fitness in the computer-readable form:

Fitness: [fitness values encoded with ec.util.Code, separated by spaces]

Specified by:

printFitness in interface Fitness

Overrides:

printFitness in class MultiObjectiveFitness

printFitnessForHumans

public void printFitnessForHumans(EvolutionState state,
                                  int log,
                                  int verbosity)

Prints the fitness in the human-readable form:

Fitness: [fitness values separated by spaces]

Specified by:

printFitnessForHumans in interface Fitness

Overrides:

printFitnessForHumans in class MultiObjectiveFitness

readFitness

public void readFitness(EvolutionState state,
                        java.io.LineNumberReader reader)
                 throws java.io.IOException,
                        java.lang.CloneNotSupportedException

Description copied from interface: Fitness

Reads in the fitness from a form printed by printFitness().

Specified by:

readFitness in interface Fitness

Overrides:

readFitness in class MultiObjectiveFitness

Throws:

java.io.IOException

java.lang.CloneNotSupportedException