@Override
public void performIteration(NichingAlgorithm alg) {
Preconditions.checkState(
alg.getOptimisationProblem() instanceof DeratingOptimisationProblem,
"DeratingNichePSO can only be used with DeratingOptimisationProblem.");
DeratingOptimisationProblem problem =
(DeratingOptimisationProblem) alg.getOptimisationProblem();
List<PopulationBasedAlgorithm> subswarms =
List.<PopulationBasedAlgorithm>iterableList(alg.getPopulations());
subswarms =
onMainSwarm(Algorithms.<PopulationBasedAlgorithm>initialise())
.andThen(phase1(alg))
.andThen(onSubswarms(clearDeratingSolutions(problem)))
.andThen(phase2(alg))
.andThen(joinAndMerge(alg, subswarms))
.f(
NichingSwarms.of(
alg.getMainSwarm(), Collections.<PopulationBasedAlgorithm>emptyList()))
._2();
problem.clearSolutions();
problem.addSolutions(
subswarms
.map(Solutions.getPosition().o(Algorithms.<PopulationBasedAlgorithm>getBestSolution()))
.toCollection());
alg.setPopulations(Lists.newLinkedList(subswarms.toCollection()));
alg.getMainSwarm().setOptimisationProblem(problem);
// dont need to set the main swarm because it gets reinitialised
}
