/**
* Computes the HV contribution of a solutiontype in a solutiontype set. REQUIRES: the
* solutiontype belongs to the solutiontype set REQUIRES: the HV of the solutiontype set is
* computed beforehand and its value is passed as third parameter
*
* @return The hv contribution of the solutiontype
*/
public double computeSolutionHVContribution(
SolutionSet solutionSet, int solutionIndex, double solutionSetHV) {
double contribution;
Solution currentPoint = solutionSet.get(solutionIndex);
solutionSet.remove(solutionIndex);
if (numberOfObjectives == 2) {
contribution = solutionSetHV - get2DHV(solutionSet);
} else {
Front front = new Front(solutionSet.size(), numberOfObjectives, solutionSet);
double hv = new WFGHV(numberOfObjectives, solutionSet.size(), referencePoint).getHV(front);
contribution = solutionSetHV - hv;
}
solutionSet.add(solutionIndex, currentPoint);
solutionSet.get(solutionIndex).setCrowdingDistance(contribution);
return contribution;
}
/**
* Computes the HV contribution of the solutions
*
* @return
*/
public void computeHVContributions(SolutionSet solutionSet) {
double[] contributions = new double[solutionSet.size()];
double solutionSetHV = 0;
solutionSetHV = computeHypervolume(solutionSet);
for (int i = 0; i < solutionSet.size(); i++) {
Solution currentPoint = solutionSet.get(i);
solutionSet.remove(i);
if (numberOfObjectives == 2) {
contributions[i] = solutionSetHV - get2DHV(solutionSet);
} else {
Front front = new Front(solutionSet.size(), numberOfObjectives, solutionSet);
double hv = new WFGHV(numberOfObjectives, solutionSet.size(), referencePoint).getHV(front);
contributions[i] = solutionSetHV - hv;
}
solutionSet.add(i, currentPoint);
}
for (int i = 0; i < solutionSet.size(); i++) {
solutionSet.get(i).setCrowdingDistance(contributions[i]);
}
}