@Override
public void assignObjectives(
MOOptimisationProblem problem, List<SinglePopulationBasedAlgorithm> populations) {
if (problem.size() > populations.size()) {
throw new IllegalArgumentException(
"There are more objectives than the number of populations required to solve this multi-objective problem.");
}
for (int i = 0; i < populations.size(); ++i) {
CriterionBasedMOProblemAdapter problemAdapter = new CriterionBasedMOProblemAdapter(problem);
problemAdapter.setActiveOptimisationProblem(problem.get(i % problem.size()));
populations.get(i).setOptimisationProblem(problemAdapter);
}
}
/** {@inheritDoc} */
@Override
public int compare(E o1, E o2) {
SinglePopulationBasedAlgorithm populationBasedAlgorithm =
(SinglePopulationBasedAlgorithm) AbstractAlgorithm.getAlgorithmList().index(0);
MOOptimisationProblem problem =
((MOOptimisationProblem) populationBasedAlgorithm.getOptimisationProblem());
Particle p1 = (Particle) o1;
Particle p2 = (Particle) o2;
MOFitness fitness1 = ((MOFitness) problem.getFitness(p1.getBestPosition()));
MOFitness fitness2 = ((MOFitness) problem.getFitness(p2.getBestPosition()));
int value = fitness1.compareTo(fitness2);
if (fitness1.compareTo(fitness2) == 0) {
int random = Rand.nextInt(20);
if (random > 10) value *= -1;
}
return value;
}