Zombie file removal.
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Marcel Kronfeld
parent
c26b394763
commit
943dc67d3c
@ -1,260 +0,0 @@
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package eva2.server.go.operators.cluster;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.LinkedList;
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import java.util.Vector;
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import eva2.gui.BeanInspector;
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import eva2.gui.GenericObjectEditor;
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import eva2.server.go.individuals.AbstractEAIndividual;
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import eva2.server.go.individuals.AbstractEAIndividualComparator;
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import eva2.server.go.operators.distancemetric.InterfaceDistanceMetric;
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import eva2.server.go.operators.distancemetric.PhenotypeMetric;
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import eva2.server.go.populations.Population;
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/**
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* Hierarchical clustering after Preuss et al., "Counteracting Genetic Drift and Disruptive Recombination
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* in (mu+,lambda)-EA on Multimodal Fitness Landscapes", GECCO '05.
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*
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* A tree is produced by assigning each individual the closest individual with better fitness.
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* Connections with a distance above a certain threshold are cut. After that, each interconnected subtree forms a cluster.
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* In the paper, the threshold is deduced as 2*d_p for d_p: the mean distance in the population.
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*
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* @author mkron
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*
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*/
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public class ClusteringHierarchical implements InterfaceClustering, Serializable {
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private static final long serialVersionUID = 1L;
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private InterfaceDistanceMetric metric = new PhenotypeMetric();
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private double absoluteDistThreshold = 0.5;
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private boolean thresholdMultipleOfMeanDist = false;
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private double meanDistFactor = 2.; // recommended setting
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private double currentMeanDistance = -1.;
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private int minimumGroupSize = 3;
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private boolean testConvergingSpeciesOnBestOnly = true; // if two species are tested for convergence, only the best indies may be compared regarding the distance threshold
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private int[] uplink;
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private double[] uplinkDist;
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private AbstractEAIndividualComparator comparator = new AbstractEAIndividualComparator();
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private Vector<Integer>[] children;
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private static boolean TRACE = false;
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public ClusteringHierarchical() {
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}
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public ClusteringHierarchical(ClusteringHierarchical o) {
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this.metric = o.metric;
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this.absoluteDistThreshold = o.absoluteDistThreshold;
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this.thresholdMultipleOfMeanDist = o.thresholdMultipleOfMeanDist;
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this.meanDistFactor = o.meanDistFactor;
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this.currentMeanDistance = o.currentMeanDistance;
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this.minimumGroupSize = o.minimumGroupSize;
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this.comparator = (AbstractEAIndividualComparator)o.comparator.clone();
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this.testConvergingSpeciesOnBestOnly = o.testConvergingSpeciesOnBestOnly;
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}
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public void hideHideable() {
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setAdaptiveThreshold(isAdaptiveThreshold());
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}
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/** This method allows you to make a deep clone of
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* the object
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* @return the deep clone
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*/
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public Object clone() {
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return (Object) new ClusteringHierarchical(this);
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}
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public boolean belongsToSpecies(AbstractEAIndividual indy,
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Population species) {
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// TODO Auto-generated method stub
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return false;
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}
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public Population[] cluster(Population pop) {
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if (pop.isEmpty()) return new Population[]{pop.cloneWithoutInds()};
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ArrayList<AbstractEAIndividual> sorted = pop.getSorted(comparator);
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if (uplink==null || (uplink.length!=pop.size())) uplink = new int[pop.size()]; // parent index of all indys
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if (uplinkDist==null || (uplinkDist.length!=pop.size())) uplinkDist = new double[pop.size()]; // parent distance for all indys
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if (children==null || (children.length!=pop.size())) children = new Vector[pop.size()]; // list of children for all indies
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else if (children.length==pop.size()) for (int i=0; i<pop.size(); i++) children[i]=null;
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if (thresholdMultipleOfMeanDist) currentMeanDistance = pop.getPopulationMeasures(metric)[0];
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if (TRACE) {
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System.out.println("Current pop measures: " + BeanInspector.toString(pop.getPopulationMeasures(metric)[0]));
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System.out.println("Current threshold: " + currentDistThreshold());
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}
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for (int i=sorted.size()-1; i>=1; i--) { // start with worst indies
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// search for closest indy which is better
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uplink[i]=-1;
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uplinkDist[i] = -1;
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for (int j=i-1; j>=0; j--) { // look at all which are better
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// if the j-th indy is closer, reset the index
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double curDist = metric.distance(sorted.get(i), sorted.get(j));
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if (uplinkDist[i]<0 || (curDist < uplinkDist[i])) {
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uplink[i] = j;
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uplinkDist[i] = curDist;
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}
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}
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// the closest best for indy i is now known. connect them in the graph.
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if (children[uplink[i]]==null) children[uplink[i]]=new Vector<Integer>();
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children[uplink[i]].add(i);
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}
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// now go through indies starting with best.
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// Add all children which are closer than threshold and recursively their children to a cluster.
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// Mark them as clustered and start with the next best unclustered.
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int current = 0; // top indy is first
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boolean[] clustered = new boolean[pop.size()];
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LinkedList<Population> allClusters = new LinkedList<Population>();
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while (current<sorted.size()) {
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Population currentClust = pop.cloneWithoutInds();
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currentClust.add(sorted.get(current));
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clustered[current]=true;
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addChildren(current, clustered, sorted, currentClust);
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// currentClust now recursively contains all children - the cluster is complete
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// now jump to the next best unclustered indy
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allClusters.add(currentClust);
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while (current<sorted.size() && (clustered[current])) current++;
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}
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ArrayList<Population> finalClusts = new ArrayList<Population>(allClusters.size());
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finalClusts.add(pop.cloneWithoutInds());
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for (Population clust : allClusters) {
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if (clust.size()<minimumGroupSize) { // add to loner population
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finalClusts.get(0).addPopulation(clust);
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} else { // add to cluster list
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finalClusts.add(clust);
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}
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}
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Population[] finalArr = new Population[finalClusts.size()];
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return finalClusts.toArray(finalArr);
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}
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/**
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* Add the next layer of children to the clustered population.
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*
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* @param current
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* @param clustered
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* @param sorted
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* @param currentClust
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*/
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private void addChildren(int current, boolean[] clustered, ArrayList<AbstractEAIndividual> sorted, Population currentClust) {
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if (children[current]!=null && (children[current].size()>0)) {
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for (int i=0; i<children[current].size(); i++) {
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if ((!clustered[children[current].get(i)]) && (uplinkDist[children[current].get(i)] < currentDistThreshold())) {
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// the first child is not clustered yet and below distance threshold.
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// so add it to the cluster, mark it, and proceed recursively.
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currentClust.add(sorted.get(children[current].get(i)));
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clustered[children[current].get(i)]=true;
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addChildren(children[current].get(i), clustered, sorted, currentClust);
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}
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}
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} else {
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// nothing more to do
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}
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}
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private double currentDistThreshold() {
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if (thresholdMultipleOfMeanDist) return meanDistFactor*currentMeanDistance;
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else return absoluteDistThreshold;
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}
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/** This method allows you to decide if two species converge.
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* @param species1 The first species.
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* @param species2 The second species.
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* @return True if species converge, else False.
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*/
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public boolean mergingSpecies(Population species1, Population species2) {
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if (testConvergingSpeciesOnBestOnly) {
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if (this.metric.distance(species1.getBestEAIndividual(), species2.getBestEAIndividual()) < this.currentDistThreshold()) return true;
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else return false;
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} else {
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Population tmpPop = new Population(species1.size()+species2.size());
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tmpPop.addPopulation(species1);
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tmpPop.addPopulation(species2);
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if (this.cluster(tmpPop).length <= 2) return true;
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else return false;
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}
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}
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public String globalInfo() {
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return "A tree is produced by assigning each individual the closest individual with better fitness. Connections with a distance above a certain threshold are cut. After that, each interconnected subtree forms a cluster.";
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}
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public String metricTipText() {
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return "The metric to use during clustering.";
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}
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public InterfaceDistanceMetric getMetric() {
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return metric;
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}
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public void setMetric(InterfaceDistanceMetric metric) {
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this.metric = metric;
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}
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public String distThresholdTipText() {
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return "In the non-adaptive case the absolute threshold below which clusters are connected.";
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}
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public double getDistThreshold() {
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return absoluteDistThreshold;
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}
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public void setDistThreshold(double distThreshold) {
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this.absoluteDistThreshold = distThreshold;
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}
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public String minimumGroupSizeTipText() {
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return "Minimum group size that makes an own cluster.";
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}
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public int getMinimumGroupSize() {
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return minimumGroupSize;
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}
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public void setMinimumGroupSize(int minimumGroupSize) {
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this.minimumGroupSize = minimumGroupSize;
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}
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public String comparatorTipText() {
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return "Define the comparator by which the population is sorted before clustering.";
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}
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public AbstractEAIndividualComparator getComparator() {
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return comparator;
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}
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// public void setComparator(AbstractEAIndividualComparator comparator) {
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// this.comparator = comparator;
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// }
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public String adaptiveThresholdTipText() {
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return "Activate adaptive threshold which is calculated from mean distance in the population and a constant factor.";
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}
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public boolean isAdaptiveThreshold() {
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return thresholdMultipleOfMeanDist;
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}
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public void setAdaptiveThreshold(boolean thresholdMultipleOfMeanDist) {
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this.thresholdMultipleOfMeanDist = thresholdMultipleOfMeanDist;
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GenericObjectEditor.setHideProperty(this.getClass(), "meanDistFactor", !thresholdMultipleOfMeanDist);
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GenericObjectEditor.setHideProperty(this.getClass(), "distThreshold", thresholdMultipleOfMeanDist);
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}
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public String meanDistFactorTipText() {
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return "Factor producing the distance threshold from population mean distance.";
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}
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public double getMeanDistFactor() {
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return meanDistFactor;
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}
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public void setMeanDistFactor(double meanDistFactor) {
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this.meanDistFactor = meanDistFactor;
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}
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public String testConvergingSpeciesOnBestOnlyTipText() {
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return "Only the best individuals may be compared when testing whether to merge two species.";
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}
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public boolean isTestConvergingSpeciesOnBestOnly() {
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return testConvergingSpeciesOnBestOnly;
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}
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public void SetTestConvergingSpeciesOnBestOnly(
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boolean testConvergingSpeciesOnBestOnly) {
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this.testConvergingSpeciesOnBestOnly = testConvergingSpeciesOnBestOnly;
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}
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}
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