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package jcgp.modules.mutator;
import jcgp.Utilities;
import jcgp.parameters.IntegerParameter;
import jcgp.parameters.Parameters;
import jcgp.population.Chromosome;
import jcgp.population.MutableElement;
import jcgp.population.Node;
import jcgp.population.Output;
public class PointMutator implements Mutator {
public PointMutator() {
Parameters.add("mutRate", new IntegerParameter(10, "Mutation rate"));
}
@Override
public void mutate(Chromosome chromosome) {
int mutations = (int) (((int) Parameters.get("mutRate").getValue()) * ((((double) Parameters.get("nodes").getValue()) + ((double) Parameters.get("outputs").getValue())) / 100));
for (int i = 0; i < mutations; i++) {
MutableElement m = chromosome.getRandomMutableElement();
if (m instanceof Output) {
m.setConnection(chromosome.getRandomConnection());
} else if (m instanceof Node) {
int geneType = Utilities.getRandomInt(1 + ((int) Parameters.get("Max arity").getValue()));
if (geneType < 1) {
((Node) m).setFunction(Utilities.getRandomFunction());
} else {
m.setConnection(chromosome.getRandomConnection(((Node) m).getColumn()));
}
}
}
}
}
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