com.anji.integration
Class ExponentialTargetFitnessFunction

java.lang.Object
  com.anji.integration.TargetFitnessFunction
      com.anji.integration.ExponentialTargetFitnessFunction

All Implemented Interfaces:

Configurable, java.io.Serializable, BulkFitnessFunction

public class ExponentialTargetFitnessFunction
extends TargetFitnessFunction

Fitness function where error is exponential; i.e., as the error gets closer to 0, the fitness increases exponentially, at a greater rate than simply squaring the error. Fitness is skewed such that max fitness is Integer.MAX_VALUE. See calculateErrorFitness() and calculateSkewedFitness() for details.

Author:

Philip Tucker

See Also:

TargetFitnessFunction, Serialized Form

Field Summary

Fields inherited from class com.anji.integration.TargetFitnessFunction

STIMULI_FILE_NAME_KEY, TARGETS_FILE_NAME_KEY

Constructor Summary

ExponentialTargetFitnessFunction()

Method Summary

protected int	calculateErrorFitness(double[][] responses, double minResponse, double maxResponse)
void	init(Properties newProps) See Parameter Details for specific property settings.

Methods inherited from class com.anji.integration.TargetFitnessFunction

evaluate, getMaxFitnessValue, getStimuli, getTargetRange, getTargets, setMaxFitnessValue

Methods inherited from class java.lang.Object

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

Constructor Detail

ExponentialTargetFitnessFunction

public ExponentialTargetFitnessFunction()

Method Detail

init

public void init(Properties newProps)

See Parameter Details for specific property settings.

Specified by:

init in interface Configurable

Overrides:

init in class TargetFitnessFunction

Parameters:

newProps - configuration parameters

calculateErrorFitness

protected int calculateErrorFitness(double[][] responses,
                                    double minResponse,
                                    double maxResponse)

Specified by:

calculateErrorFitness in class TargetFitnessFunction

Parameters:

responses -

minResponse -

maxResponse -

Returns:

int exponential fitness, calculated by squaring the error of each response, summing those errors, and using that error as an exponent to Math.E.

See Also:

TargetFitnessFunction.evaluate(List)