Examples of org.uncommons.watchmaker.framework.selection.RouletteWheelSelection

Package org.uncommons.watchmaker.framework.selection

Examples of org.uncommons.watchmaker.framework.selection.RouletteWheelSelection

org.uncommons.watchmaker.framework.selection.RouletteWheelSelection

Implements selection of n candidates from a population by selecting n candidates at random where the probability of each candidate getting selected is proportional to its fitness score. This is analogous to each candidate being assigned an area on a roulette wheel proportionate to its fitness and the wheel being spun i times. Candidates may be selected more than once.

In some instances, particularly with small population sizes, the randomness of selection may result in excessively high occurrences of particular candidates. If this is a problem, {@link StochasticUniversalSampling} provides an alternativefitness-proportionate strategy for selection.
@author Daniel Dyer

    public void testElitism()
    {
        SteadyStateEvolutionEngine<Integer> steadyState = new SteadyStateEvolutionEngine<Integer>(new StubIntegerFactory(),
                                                                                                  new IntegerAdjuster(10),
                                                                                                  new NullFitnessEvaluator(),
                                                                                                  new RouletteWheelSelection(),
                                                                                                  1,
                                                                                                  true,
                                                                                                  FrameworkTestUtils.getRNG());
        @SuppressWarnings("unchecked")
        List<EvaluatedCandidate<Integer>> population = Arrays.asList(new EvaluatedCandidate<Integer>(1, 1),

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      innerPanel.add(generationsSpinner);
      
      selectionLabel = new JLabel("Selection Strategy: ");
      innerPanel.add(selectionLabel);
      
      SelectionStrategy<?>[] selectionStrategies = {new RankSelection(), new RouletteWheelSelection(),
                                                    new StochasticUniversalSampling(),
                                                    new TournamentSelection(new Probability(0.95)),
                                                    new TruncationSelection(0.5)};
      
      selectionCombo = new JComboBox(selectionStrategies);

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