examples.monalisa.core
Class LMSFitnessFunction

java.lang.Object
  org.jgap.FitnessFunction
      examples.monalisa.core.LMSFitnessFunction

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ICloneable

public class LMSFitnessFunction
extends FitnessFunction

Computes the fitness of a program as the Least-Mean-Sqare distance between the image it generates and the target image.

Since:

3.4

See Also:

Serialized Form

Field Summary

Fields inherited from class org.jgap.FitnessFunction

DELTA, NO_FITNESS_VALUE

Method Summary

protected double

evaluate(IChromosome a_chromosome) Determine the fitness of the given Chromosome instance.

Methods inherited from class org.jgap.FitnessFunction

clone, getFitnessValue, getLastComputedFitnessValue

Methods inherited from class java.lang.Object

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

Method Detail

evaluate

protected double evaluate(IChromosome a_chromosome)

Description copied from class: FitnessFunction

Determine the fitness of the given Chromosome instance. The higher the return value, the more fit the instance. This method should always return the same fitness value for two equivalent Chromosome instances.

Specified by:

evaluate in class FitnessFunction

Parameters:

a_chromosome - the Chromosome instance to evaluate

Returns:

positive double reflecting the fitness rating of the given Chromosome. Note that if a non-positive double is returned, a RuntimeException should be generated