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package jcgp.backend.modules.mutator;
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.BooleanParameter;
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;
private BooleanParameter report;
public PointMutator(final Resources resources) {
mutationRate = new DoubleParameter(50, "Percent mutation", false, false) {
@Override
public void validate(Number newValue) {
if (newValue.doubleValue() <= 0 || newValue.doubleValue() > 100) {
status = ParameterStatus.INVALID;
status.setDetails("Mutation rate must be > 0 and <= 100");
} else if ((int) ((newValue.doubleValue() / 100) * (double) resources.nodes()) <= 0) {
status = ParameterStatus.WARNING;
status.setDetails("With mutation rate " + mutationRate.get() + ", 0 genes will be mutated.");
} else {
status = ParameterStatus.VALID;
}
}
};
report = new BooleanParameter(false, "Report") {
@Override
public void validate(Boolean newValue) {
// blank
}
};
}
@Override
public void mutate(Chromosome chromosome, Resources resources) {
int mutations = (int) ((mutationRate.get()) * (((((double) resources.nodes() + resources.outputs()))) / 100));
if (report.get()) resources.reportln("[Mutator] Number of mutations to be performed: " + mutations);
for (int i = 0; i < mutations; i++) {
MutableElement m = chromosome.getRandomMutableElement();
if (report.get()) resources.report("[Mutator] Mutation " + i + " selected " + m.toString() + ", ");
if (m instanceof Output) {
if (report.get()) resources.report("changed source from " + ((Output) m).getSource().toString() + " ");
m.setConnection(0, chromosome.getRandomConnection());
if (report.get()) resources.reportln("to " + ((Output) m).getSource().toString());
} else if (m instanceof Node) {
int geneType = resources.getRandomInt(1 + resources.arity());
if (geneType < 1) {
if (report.get()) resources.report("changed function from " + ((Node) m).getFunction().getName() + " ");
((Node) m).setFunction(resources.getRandomFunction());
if (report.get()) resources.reportln("to " + ((Node) m).getFunction().getName());
} else {
int connection = resources.getRandomInt(resources.arity());
if (report.get()) resources.report("changed connection " + connection + " from " + ((Node) m).getConnection(connection) + " ");
m.setConnection(connection, chromosome.getRandomConnection(((Node) m).getColumn()));
if (report.get()) resources.reportln("to " + ((Node) m).getConnection(connection));
}
}
}
}
@Override
public Parameter<?>[] getLocalParameters() {
return new Parameter[] {mutationRate, report};
}
@Override
public String toString() {
return "Point mutation";
}
}
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