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package jcgp.backend.modules.mutator;
import jcgp.backend.function.Function;
import jcgp.backend.population.Chromosome;
import jcgp.backend.population.MutableElement;
import jcgp.backend.population.Node;
import jcgp.backend.population.Output;
import jcgp.backend.resources.Resources;
import jcgp.backend.resources.parameters.DoubleParameter;
import jcgp.backend.resources.parameters.Parameter;
import jcgp.backend.resources.parameters.ParameterStatus;
public class PointMutator implements Mutator {
private DoubleParameter mutationRate;
public PointMutator(final Resources resources) {
mutationRate = new DoubleParameter(50, "Percent mutation", false, false) {
@Override
public void validate(double newValue) {
if (newValue <= 0 || newValue > 100) {
status = ParameterStatus.INVALID;
status.setDetails("Mutation rate must be > 0 and <= 100");
} else if ((int) ((newValue / 100) * resources.getDouble("nodes")) <= 0) {
status = ParameterStatus.WARNING;
status.setDetails("With mutation rate " + mutationRate.get() + ", 0 genes will be mutated.");
} else {
status = ParameterStatus.VALID;
}
}
};
}
@Override
public void mutate(Chromosome chromosome, Resources resources) {
int mutations = (int) ((mutationRate.get()) * ((((resources.getDouble("nodes")) + (resources.getDouble("outputs")))) / 100));
for (int i = 0; i < mutations; i++) {
MutableElement m = chromosome.getRandomMutableElement();
if (m instanceof Output) {
m.setConnection(0, chromosome.getRandomConnection());
} else if (m instanceof Node) {
int geneType = resources.getRandomInt(1 + resources.getInt("arity"));
if (geneType < 1) {
Function f = resources.getRandomFunction();
((Node) m).setFunction(f);
} else {
m.setConnection(resources.getRandomInt(resources.getInt("arity")), chromosome.getRandomConnection(((Node) m).getColumn()));
}
}
}
}
@Override
public Parameter[] getLocalParameters() {
return new Parameter[] {mutationRate};
}
@Override
public String toString() {
return "Point mutation";
}
}
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