| 1 | package de.uka.ipd.sdq.dsexplore.opt4j.representation; |
| 2 | |
| 3 | import static org.opt4j.core.Individual.State.EMPTY; |
| 4 | |
| 5 | import org.opt4j.core.Individual; |
| 6 | import org.opt4j.core.IndividualBuilder; |
| 7 | import org.opt4j.operator.mutate.AdaptiveMutationRate; |
| 8 | import org.opt4j.start.Constant; |
| 9 | |
| 10 | /** |
| 11 | * The {@link AdaptiveMutationRate} always uses a mutation rate of 1 / (genome length). In this |
| 12 | * class, the ratio can be configured by a factor mutationIntensity, so that the |
| 13 | * final mutation rate is min(1, 1 / (genome length) * mutationIntensity). The higher the mutation intensity, |
| 14 | * the closer the mutation rate comes to 1. If the mutation intensity is larger than the genome length, then |
| 15 | * the mutation rate is capped to 1. |
| 16 | * |
| 17 | * A mutation intensity smaller than 1 leads to less mutation that in the {@link AdaptiveMutationRate}. |
| 18 | * A mutation intensity larger than 1 leads to more mutation than in the {@link AdaptiveMutationRate}. |
| 19 | * |
| 20 | * @author martens |
| 21 | * |
| 22 | */ |
| 23 | public class ConfigurableAdaptiveMutationRate extends AdaptiveMutationRate { |
| 24 | |
| 25 | private double mutationIntensity = 1; |
| 26 | |
| 27 | public ConfigurableAdaptiveMutationRate(IndividualBuilder individualBuilder, |
| 28 | @Constant(value = "intensity", namespace = ConfigurableAdaptiveMutationRate.class) double intensity) { |
| 29 | super(individualBuilder); |
| 30 | this.mutationIntensity = intensity; |
| 31 | } |
| 32 | |
| 33 | |
| 34 | /* |
| 35 | * (non-Javadoc) |
| 36 | * |
| 37 | * @see |
| 38 | * org.opt4j.core.IndividualStateListener#inidividualStateChanged(org.opt4j |
| 39 | * .core.Individual) |
| 40 | */ |
| 41 | public synchronized void inidividualStateChanged(Individual individual) { |
| 42 | if (!isInit && individual.getState() != EMPTY) { |
| 43 | final int size = individual.getGenotype().size(); |
| 44 | if (size > 0) { |
| 45 | set(Math.min(1.0, 1.0 / individual.getGenotype().size() * mutationIntensity)); |
| 46 | } |
| 47 | individualBuilder.removeIndividualStateListener(this); |
| 48 | isInit = true; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | |
| 53 | public void setMutationIntensity(double mutationIntensity) { |
| 54 | this.mutationIntensity = mutationIntensity; |
| 55 | } |
| 56 | |
| 57 | |
| 58 | public double getMutationIntensity() { |
| 59 | return mutationIntensity; |
| 60 | } |
| 61 | |
| 62 | } |