org.encog.neural.neat.training.opp.links
Class MutatePerturbLinkWeight

java.lang.Object
  extended by org.encog.neural.neat.training.opp.links.MutatePerturbLinkWeight
All Implemented Interfaces:
MutateLinkWeight

public class MutatePerturbLinkWeight
extends Object
implements MutateLinkWeight

Mutate weight links by perturbing their weights. This will be done by adding a Gaussian random number with the specified sigma. The sigma specifies the standard deviation of the random number. Because the random numbers are clustered at zero, this can be either an increase or decrease. ----------------------------------------------------------------------------- http://www.cs.ucf.edu/~kstanley/ Encog's NEAT implementation was drawn from the following three Journal Articles. For more complete BibTeX sources, see NEATNetwork.java. Evolving Neural Networks Through Augmenting Topologies Generating Large-Scale Neural Networks Through Discovering Geometric Regularities Automatic feature selection in neuroevolution


Constructor Summary
MutatePerturbLinkWeight(double theSigma)
          Construct the perturbing mutator.
 
Method Summary
 EvolutionaryAlgorithm getTrainer()
          
 void init(EvolutionaryAlgorithm theTrainer)
          Setup the link mutator.
 void mutateWeight(Random rnd, NEATLinkGene linkGene, double weightRange)
          Perform the weight mutation on the specified link.
 String toString()
          
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

MutatePerturbLinkWeight

public MutatePerturbLinkWeight(double theSigma)
Construct the perturbing mutator.

Parameters:
theSigma - The sigma (standard deviation) for all random numbers.
Method Detail

getTrainer

public EvolutionaryAlgorithm getTrainer()

Specified by:
getTrainer in interface MutateLinkWeight
Returns:
The training class that this mutator is being used with.

init

public void init(EvolutionaryAlgorithm theTrainer)
Setup the link mutator.

Specified by:
init in interface MutateLinkWeight
Parameters:
theTrainer - The training class that this mutator is used with.

mutateWeight

public void mutateWeight(Random rnd,
                         NEATLinkGene linkGene,
                         double weightRange)
Perform the weight mutation on the specified link.

Specified by:
mutateWeight in interface MutateLinkWeight
Parameters:
rnd - A random number generator.
linkGene - The link to mutate.
weightRange - The weight range, weights are between -weightRange and +weightRange.

toString

public String toString()

Overrides:
toString in class Object


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