examples.gp.monalisa.core
Class LMSFitnessFunction

java.lang.Object
  org.jgap.gp.GPFitnessFunction
      examples.gp.monalisa.core.LMSFitnessFunction

All Implemented Interfaces:

java.io.Serializable

public class LMSFitnessFunction
extends GPFitnessFunction

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.gp.GPFitnessFunction

MAX_FITNESS_VALUE, NO_FITNESS_VALUE

Method Summary

protected double

evaluate(IGPProgram a_subject) Determine the fitness of the given GPProgram instance.

Methods inherited from class org.jgap.gp.GPFitnessFunction

getFitnessValue, getLastComputedFitnessValue, GPFitnessFunction

Methods inherited from class java.lang.Object

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

Method Detail

evaluate

protected double evaluate(IGPProgram a_subject)

Description copied from class: GPFitnessFunction

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

Specified by:

evaluate in class GPFitnessFunction

Parameters:

a_subject - the GPProgram instance to evaluate

Returns:

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