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package jcgp.backend.modules.mutator;
import jcgp.backend.parameters.BooleanParameter;
import jcgp.backend.parameters.DoubleParameter;
import jcgp.backend.parameters.ParameterStatus;
import jcgp.backend.parameters.monitors.IntegerMonitor;
import jcgp.backend.resources.Resources;
/**
* Percent point mutator
* <br><br>
* This operator calculates how many genes to mutate based on the mutation rate
* parameter. The total number of genes is computed from the number of nodes,
* the arity and the number of outputs. It then uses the point mutation
* algorithm to perform the required number of mutations.
*
*
* @see PointMutator
* @author Eduardo Pedroni
*
*/
public class PercentPointMutator extends PointMutator {
private DoubleParameter mutationRate;
/**
* Creates a new instance of PointMutator.
*
* @param resources a reference to the experiment's resources.
*/
public PercentPointMutator(final Resources resources) {
super();
mutationRate = new DoubleParameter(10, "Percent mutation", false, false) {
@Override
public void validate(Number newValue) {
genesMutated.set((int) ((newValue.intValue()) * (((((double) resources.nodes() + resources.outputs()))) / 100)));
if (newValue.doubleValue() <= 0 || newValue.doubleValue() > 100) {
status = ParameterStatus.INVALID;
status.setDetails("Mutation rate must be > 0 and <= 100");
} else if (genesMutated.get() <= 0) {
status = ParameterStatus.WARNING;
status.setDetails("With mutation rate " + mutationRate.get() + ", 0 genes will be mutated.");
} else {
status = ParameterStatus.VALID;
}
}
};
genesMutated = new IntegerMonitor(0, "Genes mutated");
report = new BooleanParameter(false, "Report");
setName("Percent point mutation");
registerParameters(mutationRate, genesMutated, report);
}
}
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