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);
}
