private Gene mutateNode(NEATNodeGene mutatee) {
double perturbRandVal = perturbRand.nextDouble();
double mutateBias = perturbRand.nextDouble();
NEATNodeGene mutated = mutatee;
double newSF = mutatee.sigmoidFactor();
double newBias = mutatee.bias();
if (perturbRandVal < this.pPerturb) {
newSF = mutatee.sigmoidFactor() + MathUtils.nextClampedDouble(-perturb, perturb);
mutated =
new NEATNodeGene(
mutated.getInnovationNumber(),
mutated.id(),
newSF,
mutated.getType(),
mutated.bias());
}
if (mutateBias < this.pMutateBias) {
newBias += MathUtils.nextClampedDouble(-biasPerturb, biasPerturb);
mutated =
new NEATNodeGene(
mutated.getInnovationNumber(),
mutated.id(),
mutated.sigmoidFactor(),
mutated.getType(),
newBias);
}
return (mutated);
}
private Gene mutateLink(NEATLinkGene mutatee) {
double perturbRandVal = perturbRand.nextDouble();
double disableRandVal = disableRand.nextDouble();
double newWeight;
NEATLinkGene mutated = mutatee;
if (perturbRandVal < this.pPerturb) {
if (this.pWeightReplaced > perturbRand.nextDouble()) {
newWeight = MathUtils.nextPlusMinusOne();
} else {
newWeight = mutatee.getWeight() + MathUtils.nextClampedDouble(-perturb, perturb);
}
// newWeight = mutatee.getWeight() + MathUtils.nextClampedDouble(-PERTURB, PERTURB);
mutated =
new NEATLinkGene(
mutatee.getInnovationNumber(),
mutatee.isEnabled(),
mutatee.getFromId(),
mutatee.getToId(),
newWeight);
}
if (disableRandVal < this.pToggle) {
if (this.featureSelection) {
mutated.setEnabled(!mutated.isEnabled());
}
}
return (mutated);
}
private Gene mutateFeature(NEATFeatureGene mutatee) {
double perturbRandVal = perturbRand.nextDouble();
Gene mutated = mutatee;
if (perturbRandVal < this.pPerturb) {
mutated =
new NEATFeatureGene(
mutatee.getInnovationNumber(),
mutatee.geneAsNumber().doubleValue()
+ MathUtils.nextClampedDouble(-perturb, perturb));
}
return (mutated);
}
private void mutateAddLink(Chromosome mutatee) {
double linkRandVal = linkRand.nextDouble();
NEATNodeGene from;
NEATNodeGene to;
int rIdx;
int i = 0;
ArrayList links;
ArrayList nodes;
Gene[] genes = new Gene[mutatee.size() + 1];
System.arraycopy(mutatee.genes(), 0, genes, 0, mutatee.genes().length);
Gene newLink = null;
if (linkRandVal < this.pAddLink) {
nodes = this.candidateNodes(mutatee.genes());
links = this.candidateLinks(mutatee.genes(), false);
// find a new available link
while (newLink == null && i < MAX_LINK_ATTEMPTS) {
rIdx = linkRand.nextInt(nodes.size());
from = ((NEATNodeGene) nodes.get(rIdx));
rIdx = linkRand.nextInt(nodes.size());
to = ((NEATNodeGene) nodes.get(rIdx));
// TODO Remove
if (from.getInnovationNumber() == 2 && to.getInnovationNumber() == 5) {
System.out.println("a");
}
if (!this.linkIllegal(from, to, links)) {
// set it to a random value
newLink = InnovationDatabase.database().submitLinkInnovation(from.id(), to.id());
((NEATLinkGene) newLink).setWeight(MathUtils.nextPlusMinusOne());
// add link between 2 unconnected nodes
genes[genes.length - 1] = newLink;
mutatee.updateChromosome(genes);
}
i++;
}
}
}