Ejemplo n.º 1
0
        private CombinedOperator CreateReseeder()
        {
            var reseeder = new CombinedOperator {
                Name = "Reseed Layer Zero if needed"
            };
            var reseedingController = new ReseedingController {
                Name = "Reseeding needed (Generation % AgeGap == 0)?"
            };
            var removeIndividuals      = new SubScopesRemover();
            var createIndividuals      = new SolutionsCreator();
            var initializeAgeProcessor = new UniformSubScopesProcessor();
            var initializeAge          = new VariableCreator {
                Name = "Initialize Age"
            };
            var incrEvaluatedSolutionsAfterReseeding = new SubScopesCounter {
                Name = "Update EvaluatedSolutions"
            };
            var rankAndCrowdingSorter = new RankAndCrowdingSorter();

            reseeder.OperatorGraph.InitialOperator = reseedingController;

            reseedingController.GenerationsParameter.ActualName = "Generations";
            reseedingController.AgeGapParameter.ActualName      = AgeGapParameter.Name;
            reseedingController.FirstLayerOperator = removeIndividuals;
            reseedingController.Successor          = null;

            removeIndividuals.Successor = createIndividuals;

            createIndividuals.NumberOfSolutionsParameter.ActualName = PopulationSizeParameter.Name;
            createIndividuals.Successor = initializeAgeProcessor;

            initializeAgeProcessor.Operator  = initializeAge;
            initializeAgeProcessor.Successor = incrEvaluatedSolutionsAfterReseeding;

            initializeAge.CollectedValues.Add(new ValueParameter <DoubleValue>(AgeParameter.Name, new DoubleValue(0)));

            incrEvaluatedSolutionsAfterReseeding.ValueParameter.ActualName = EvaluatedSolutionsParameter.Name;
            incrEvaluatedSolutionsAfterReseeding.AccumulateParameter.Value = new BoolValue(true);

            incrEvaluatedSolutionsAfterReseeding.Successor = rankAndCrowdingSorter;

            return(reseeder);
        }
Ejemplo n.º 2
0
    private void Initialize() {
      #region Create parameters
      Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
      Parameters.Add(new ValueLookupParameter<BoolArray>("Maximization", "True if an objective should be maximized, or false if it should be minimized."));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleArray>("Qualities", "The vector of quality values."));
      Parameters.Add(new ValueLookupParameter<IntValue>("PopulationSize", "The population size."));
      Parameters.Add(new ValueLookupParameter<IOperator>("Selector", "The operator used to select solutions for reproduction."));
      Parameters.Add(new ValueLookupParameter<PercentValue>("CrossoverProbability", "The probability that the crossover operator is applied on a solution."));
      Parameters.Add(new ValueLookupParameter<IOperator>("Crossover", "The operator used to cross solutions."));
      Parameters.Add(new ValueLookupParameter<PercentValue>("MutationProbability", "The probability that the mutation operator is applied on a solution."));
      Parameters.Add(new ValueLookupParameter<IOperator>("Mutator", "The operator used to mutate solutions."));
      Parameters.Add(new ValueLookupParameter<IOperator>("Evaluator", "The operator used to evaluate solutions. This operator is executed in parallel, if an engine is used which supports parallelization."));
      Parameters.Add(new ValueLookupParameter<IntValue>("MaximumGenerations", "The maximum number of generations which should be processed."));
      Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
      Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The operator used to analyze each generation."));
      Parameters.Add(new LookupParameter<IntValue>("EvaluatedSolutions", "The number of times solutions have been evaluated."));
      Parameters.Add(new ValueLookupParameter<BoolValue>("DominateOnEqualQualities", "Flag which determines wether solutions with equal quality values should be treated as dominated."));
      #endregion

      #region Create operators
      VariableCreator variableCreator = new VariableCreator();
      ResultsCollector resultsCollector1 = new ResultsCollector();
      Placeholder analyzer1 = new Placeholder();
      Placeholder selector = new Placeholder();
      SubScopesProcessor subScopesProcessor1 = new SubScopesProcessor();
      ChildrenCreator childrenCreator = new ChildrenCreator();
      UniformSubScopesProcessor uniformSubScopesProcessor1 = new UniformSubScopesProcessor();
      StochasticBranch crossoverStochasticBranch = new StochasticBranch();
      Placeholder crossover = new Placeholder();
      ParentCopyCrossover noCrossover = new ParentCopyCrossover();
      StochasticBranch mutationStochasticBranch = new StochasticBranch();
      Placeholder mutator = new Placeholder();
      SubScopesRemover subScopesRemover = new SubScopesRemover();
      UniformSubScopesProcessor uniformSubScopesProcessor2 = new UniformSubScopesProcessor();
      Placeholder evaluator = new Placeholder();
      SubScopesCounter subScopesCounter = new SubScopesCounter();
      MergingReducer mergingReducer = new MergingReducer();
      RankAndCrowdingSorter rankAndCrowdingSorter = new RankAndCrowdingSorter();
      LeftSelector leftSelector = new LeftSelector();
      RightReducer rightReducer = new RightReducer();
      IntCounter intCounter = new IntCounter();
      Comparator comparator = new Comparator();
      Placeholder analyzer2 = new Placeholder();
      ConditionalBranch conditionalBranch = new ConditionalBranch();

      variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Generations", new IntValue(0)));

      resultsCollector1.CollectedValues.Add(new LookupParameter<IntValue>("Generations"));
      resultsCollector1.ResultsParameter.ActualName = ResultsParameter.Name;

      analyzer1.Name = "Analyzer";
      analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;

      selector.Name = "Selector";
      selector.OperatorParameter.ActualName = SelectorParameter.Name;

      childrenCreator.ParentsPerChild = new IntValue(2);

      crossoverStochasticBranch.ProbabilityParameter.ActualName = CrossoverProbabilityParameter.Name;
      crossoverStochasticBranch.RandomParameter.ActualName = RandomParameter.Name;

      crossover.Name = "Crossover";
      crossover.OperatorParameter.ActualName = CrossoverParameter.Name;

      noCrossover.Name = "Clone parent";
      noCrossover.RandomParameter.ActualName = RandomParameter.Name;

      mutationStochasticBranch.ProbabilityParameter.ActualName = MutationProbabilityParameter.Name;
      mutationStochasticBranch.RandomParameter.ActualName = RandomParameter.Name;

      mutator.Name = "Mutator";
      mutator.OperatorParameter.ActualName = MutatorParameter.Name;

      subScopesRemover.RemoveAllSubScopes = true;

      uniformSubScopesProcessor2.Parallel.Value = true;

      evaluator.Name = "Evaluator";
      evaluator.OperatorParameter.ActualName = EvaluatorParameter.Name;

      subScopesCounter.Name = "Increment EvaluatedSolutions";
      subScopesCounter.ValueParameter.ActualName = EvaluatedSolutionsParameter.Name;

      rankAndCrowdingSorter.DominateOnEqualQualitiesParameter.ActualName = DominateOnEqualQualitiesParameter.Name;
      rankAndCrowdingSorter.CrowdingDistanceParameter.ActualName = "CrowdingDistance";
      rankAndCrowdingSorter.RankParameter.ActualName = "Rank";

      leftSelector.CopySelected = new BoolValue(false);
      leftSelector.NumberOfSelectedSubScopesParameter.ActualName = PopulationSizeParameter.Name;

      intCounter.Increment = new IntValue(1);
      intCounter.ValueParameter.ActualName = "Generations";

      comparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
      comparator.LeftSideParameter.ActualName = "Generations";
      comparator.ResultParameter.ActualName = "Terminate";
      comparator.RightSideParameter.ActualName = MaximumGenerationsParameter.Name;

      analyzer2.Name = "Analyzer";
      analyzer2.OperatorParameter.ActualName = "Analyzer";

      conditionalBranch.ConditionParameter.ActualName = "Terminate";
      #endregion

      #region Create operator graph
      OperatorGraph.InitialOperator = variableCreator;
      variableCreator.Successor = resultsCollector1;
      resultsCollector1.Successor = analyzer1;
      analyzer1.Successor = selector;
      selector.Successor = subScopesProcessor1;
      subScopesProcessor1.Operators.Add(new EmptyOperator());
      subScopesProcessor1.Operators.Add(childrenCreator);
      subScopesProcessor1.Successor = mergingReducer;
      childrenCreator.Successor = uniformSubScopesProcessor1;
      uniformSubScopesProcessor1.Operator = crossoverStochasticBranch;
      uniformSubScopesProcessor1.Successor = uniformSubScopesProcessor2;
      crossoverStochasticBranch.FirstBranch = crossover;
      crossoverStochasticBranch.SecondBranch = noCrossover;
      crossoverStochasticBranch.Successor = mutationStochasticBranch;
      crossover.Successor = null;
      noCrossover.Successor = null;
      mutationStochasticBranch.FirstBranch = mutator;
      mutationStochasticBranch.SecondBranch = null;
      mutationStochasticBranch.Successor = subScopesRemover;
      mutator.Successor = null;
      subScopesRemover.Successor = null;
      uniformSubScopesProcessor2.Operator = evaluator;
      uniformSubScopesProcessor2.Successor = subScopesCounter;
      evaluator.Successor = null;
      subScopesCounter.Successor = null;
      mergingReducer.Successor = rankAndCrowdingSorter;
      rankAndCrowdingSorter.Successor = leftSelector;
      leftSelector.Successor = rightReducer;
      rightReducer.Successor = intCounter;
      intCounter.Successor = comparator;
      comparator.Successor = analyzer2;
      analyzer2.Successor = conditionalBranch;
      conditionalBranch.FalseBranch = selector;
      conditionalBranch.TrueBranch = null;
      conditionalBranch.Successor = null;
      #endregion
    }
Ejemplo n.º 3
0
    public NSGA2() {
      Parameters.Add(new ValueParameter<IntValue>("Seed", "The random seed used to initialize the new pseudo random number generator.", new IntValue(0)));
      Parameters.Add(new ValueParameter<BoolValue>("SetSeedRandomly", "True if the random seed should be set to a random value, otherwise false.", new BoolValue(true)));
      Parameters.Add(new ValueParameter<IntValue>("PopulationSize", "The size of the population of solutions.", new IntValue(100)));
      Parameters.Add(new ConstrainedValueParameter<ISelector>("Selector", "The operator used to select solutions for reproduction."));
      Parameters.Add(new ValueParameter<PercentValue>("CrossoverProbability", "The probability that the crossover operator is applied on two parents.", new PercentValue(0.9)));
      Parameters.Add(new ConstrainedValueParameter<ICrossover>("Crossover", "The operator used to cross solutions."));
      Parameters.Add(new ValueParameter<PercentValue>("MutationProbability", "The probability that the mutation operator is applied on a solution.", new PercentValue(0.05)));
      Parameters.Add(new OptionalConstrainedValueParameter<IManipulator>("Mutator", "The operator used to mutate solutions."));
      Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze each generation.", new MultiAnalyzer()));
      Parameters.Add(new ValueParameter<IntValue>("MaximumGenerations", "The maximum number of generations which should be processed.", new IntValue(1000)));
      Parameters.Add(new ValueParameter<IntValue>("SelectedParents", "Each two parents form a new child, typically this value should be twice the population size, but because the NSGA-II is maximally elitist it can be any multiple of 2 greater than 0.", new IntValue(200)));
      Parameters.Add(new FixedValueParameter<BoolValue>("DominateOnEqualQualities", "Flag which determines wether solutions with equal quality values should be treated as dominated.", new BoolValue(false)));

      RandomCreator randomCreator = new RandomCreator();
      SolutionsCreator solutionsCreator = new SolutionsCreator();
      SubScopesCounter subScopesCounter = new SubScopesCounter();
      RankAndCrowdingSorter rankAndCrowdingSorter = new RankAndCrowdingSorter();
      ResultsCollector resultsCollector = new ResultsCollector();
      NSGA2MainLoop mainLoop = new NSGA2MainLoop();

      OperatorGraph.InitialOperator = randomCreator;

      randomCreator.RandomParameter.ActualName = "Random";
      randomCreator.SeedParameter.ActualName = SeedParameter.Name;
      randomCreator.SeedParameter.Value = null;
      randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name;
      randomCreator.SetSeedRandomlyParameter.Value = null;
      randomCreator.Successor = solutionsCreator;

      solutionsCreator.NumberOfSolutionsParameter.ActualName = PopulationSizeParameter.Name;
      solutionsCreator.Successor = subScopesCounter;

      subScopesCounter.Name = "Initialize EvaluatedSolutions";
      subScopesCounter.ValueParameter.ActualName = "EvaluatedSolutions";
      subScopesCounter.Successor = rankAndCrowdingSorter;

      rankAndCrowdingSorter.DominateOnEqualQualitiesParameter.ActualName = DominateOnEqualQualitiesParameter.Name;
      rankAndCrowdingSorter.CrowdingDistanceParameter.ActualName = "CrowdingDistance";
      rankAndCrowdingSorter.RankParameter.ActualName = "Rank";
      rankAndCrowdingSorter.Successor = resultsCollector;

      resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Solutions", null, "EvaluatedSolutions"));
      resultsCollector.ResultsParameter.ActualName = "Results";
      resultsCollector.Successor = mainLoop;

      mainLoop.PopulationSizeParameter.ActualName = PopulationSizeParameter.Name;
      mainLoop.SelectorParameter.ActualName = SelectorParameter.Name;
      mainLoop.CrossoverParameter.ActualName = CrossoverParameter.Name;
      mainLoop.CrossoverProbabilityParameter.ActualName = CrossoverProbabilityParameter.Name;
      mainLoop.MaximumGenerationsParameter.ActualName = MaximumGenerationsParameter.Name;
      mainLoop.MutatorParameter.ActualName = MutatorParameter.Name;
      mainLoop.MutationProbabilityParameter.ActualName = MutationProbabilityParameter.Name;
      mainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
      mainLoop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
      mainLoop.ResultsParameter.ActualName = "Results";
      mainLoop.EvaluatedSolutionsParameter.ActualName = "EvaluatedSolutions";

      foreach (ISelector selector in ApplicationManager.Manager.GetInstances<ISelector>().Where(x => !(x is ISingleObjectiveSelector)).OrderBy(x => x.Name))
        SelectorParameter.ValidValues.Add(selector);
      ISelector tournamentSelector = SelectorParameter.ValidValues.FirstOrDefault(x => x.GetType().Name.Equals("CrowdedTournamentSelector"));
      if (tournamentSelector != null) SelectorParameter.Value = tournamentSelector;

      ParameterizeSelectors();

      paretoFrontAnalyzer = new RankBasedParetoFrontAnalyzer();
      paretoFrontAnalyzer.RankParameter.ActualName = "Rank";
      paretoFrontAnalyzer.RankParameter.Depth = 1;
      paretoFrontAnalyzer.ResultsParameter.ActualName = "Results";
      ParameterizeAnalyzers();
      UpdateAnalyzers();

      AfterDeserialization();
    }
Ejemplo n.º 4
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        private CombinedOperator CreateEldersEmigrator()
        {
            var eldersEmigrator = new CombinedOperator {
                Name = "Emigrate Elders"
            };
            var selectorProcessor    = new UniformSubScopesProcessor();
            var eldersSelector       = new EldersSelector();
            var shiftToRightMigrator = new UnidirectionalRingMigrator {
                Name = "Shift elders to next layer"
            };
            var mergingProcessor  = new UniformSubScopesProcessor();
            var mergingReducer    = new MergingReducer();
            var subScopesCounter1 = new SubScopesCounter();
            var currentPopulationSizeComparator = new Comparator {
                Name = "Is CurrentPopulationSize greater than 1?"
            };
            var currentPopulationSizeIsGreaterThanOne = new ConditionalBranch {
                Name = "CurrentPopulationSize > 1"
            };
            var reduceToPopulationSizeBranch = new ConditionalBranch {
                Name = "ReduceToPopulationSize?"
            };
            var countCalculator = new ExpressionCalculator {
                Name = "CurrentPopulationSize = Min(CurrentPopulationSize, PopulationSize)"
            };
            var leftSelector          = new LeftSelector();
            var rankAndCrowdingSorter = new RankAndCrowdingSorter();
            var subScopesCounter2     = new SubScopesCounter();
            var rightReducer          = new RightReducer();

            eldersEmigrator.OperatorGraph.InitialOperator = selectorProcessor;

            selectorProcessor.Operator  = eldersSelector;
            selectorProcessor.Successor = shiftToRightMigrator;

            eldersSelector.AgeParameter.ActualName            = AgeParameter.Name;
            eldersSelector.AgeLimitsParameter.ActualName      = AgeLimitsParameter.Name;
            eldersSelector.NumberOfLayersParameter.ActualName = NumberOfLayersParameter.Name;
            eldersSelector.LayerParameter.ActualName          = "Layer";
            eldersSelector.Successor = null;

            shiftToRightMigrator.ClockwiseMigrationParameter.Value = new BoolValue(true);
            shiftToRightMigrator.Successor = mergingProcessor;

            mergingProcessor.Operator = mergingReducer;

            mergingReducer.Successor = subScopesCounter1;

            subScopesCounter1.ValueParameter.ActualName = CurrentPopulationSizeParameter.Name;
            subScopesCounter1.AccumulateParameter.Value = new BoolValue(false);
            subScopesCounter1.Successor = currentPopulationSizeComparator;

            currentPopulationSizeComparator.LeftSideParameter.ActualName  = CurrentPopulationSizeParameter.Name;
            currentPopulationSizeComparator.RightSideParameter.ActualName = OneParameter.Name;
            currentPopulationSizeComparator.ResultParameter.ActualName    = "CurrentPopulationSizeIsGreaterThanOne";
            currentPopulationSizeComparator.Comparison = new Comparison(ComparisonType.Greater);
            currentPopulationSizeComparator.Successor  = currentPopulationSizeIsGreaterThanOne;

            currentPopulationSizeIsGreaterThanOne.ConditionParameter.ActualName = "CurrentPopulationSizeIsGreaterThanOne";
            currentPopulationSizeIsGreaterThanOne.TrueBranch = rankAndCrowdingSorter;

            // We have to sort individuals before reducing, because if we shifted some of them to another layer, it can happen that they are not correctly sorted
            rankAndCrowdingSorter.DominateOnEqualQualitiesParameter.ActualName = DominateOnEqualQualitiesParameter.Name;
            rankAndCrowdingSorter.CrowdingDistanceParameter.ActualName         = "CrowdingDistance";
            rankAndCrowdingSorter.RankParameter.ActualName = "Rank";
            rankAndCrowdingSorter.Successor = reduceToPopulationSizeBranch;

            reduceToPopulationSizeBranch.ConditionParameter.ActualName = ReduceToPopulationSizeParameter.Name;
            reduceToPopulationSizeBranch.TrueBranch = countCalculator;

            countCalculator.CollectedValues.Add(new LookupParameter <IntValue>(PopulationSizeParameter.Name));
            countCalculator.CollectedValues.Add(new LookupParameter <IntValue>(CurrentPopulationSizeParameter.Name));
            countCalculator.ExpressionParameter.Value            = new StringValue("CurrentPopulationSize PopulationSize CurrentPopulationSize PopulationSize < if toint");
            countCalculator.ExpressionResultParameter.ActualName = CurrentPopulationSizeParameter.Name;
            countCalculator.Successor = leftSelector;

            leftSelector.CopySelected = new BoolValue(false);
            leftSelector.NumberOfSelectedSubScopesParameter.ActualName = CurrentPopulationSizeParameter.Name;
            leftSelector.Successor = rightReducer;

            rightReducer.Successor = subScopesCounter2;
            subScopesCounter2.ValueParameter.ActualName = CurrentPopulationSizeParameter.Name;
            subScopesCounter2.AccumulateParameter.Value = new BoolValue(false);

            return(eldersEmigrator);
        }
Ejemplo n.º 5
0
        private void Initialize()
        {
            #region Create parameters

            Parameters.Add(new ValueLookupParameter <IRandom>("GlobalRandom", "A pseudo random number generator."));
            Parameters.Add(new ValueLookupParameter <IRandom>("LocalRandom", "A pseudo random number generator."));

            Parameters.Add(new ValueLookupParameter <BoolArray>("Maximization", "True if an objective should be maximized, or false if it should be minimized."));
            Parameters.Add(new ScopeTreeLookupParameter <DoubleArray>("Qualities", "The vector of quality values."));

            Parameters.Add(new ValueLookupParameter <IntValue>("NumberOfLayers", "The number of layers."));
            Parameters.Add(new ValueLookupParameter <IntValue>("PopulationSize", "The population size."));
            Parameters.Add(new LookupParameter <IntValue>("CurrentPopulationSize", "The current size of the population."));

            Parameters.Add(new ValueLookupParameter <IOperator>("Selector", "The operator used to select solutions for reproduction."));

            Parameters.Add(new ValueLookupParameter <PercentValue>("CrossoverProbability", "The probability that the crossover operator is applied on a solution."));
            Parameters.Add(new ValueLookupParameter <IOperator>("Crossover", "The operator used to cross solutions."));
            Parameters.Add(new ValueLookupParameter <PercentValue>("MutationProbability", "The probability that the mutation operator is applied on a solution."));
            Parameters.Add(new ValueLookupParameter <IOperator>("Mutator", "The operator used to mutate solutions."));

            Parameters.Add(new ScopeTreeLookupParameter <DoubleValue>("Age", "The age of individuals."));
            Parameters.Add(new ValueLookupParameter <IntValue>("AgeGap", "The frequency of reseeding the lowest layer and scaling factor for the age-limits for the layers."));
            Parameters.Add(new ValueLookupParameter <DoubleValue>("AgeInheritance", "A weight that determines the age of a child after crossover based on the older (1.0) and younger (0.0) parent."));
            Parameters.Add(new ValueLookupParameter <IntArray>("AgeLimits", "The maximum age an individual is allowed to reach in a certain layer."));

            Parameters.Add(new ValueLookupParameter <IntValue>("MatingPoolRange", "The range of sub - populations used for creating a mating pool. (1 = current + previous sub-population)"));
            Parameters.Add(new ValueLookupParameter <BoolValue>("ReduceToPopulationSize", "Reduce the CurrentPopulationSize after elder migration to PopulationSize"));

            Parameters.Add(new ValueLookupParameter <IOperator>("Evaluator", "The operator used to evaluate solutions. This operator is executed in parallel, if an engine is used which supports parallelization."));
            Parameters.Add(new ValueLookupParameter <VariableCollection>("Results", "The variable collection where results should be stored."));

            Parameters.Add(new ValueLookupParameter <IOperator>("Analyzer", "The operator used to analyze each generation."));
            Parameters.Add(new ValueLookupParameter <IOperator>("LayerAnalyzer", "The operator used to analyze each layer."));
            Parameters.Add(new ValueLookupParameter <IOperator>("FinalAnalyzer", "The operator used to finally analyze the solution (after termination of the algorithm)."));

            Parameters.Add(new LookupParameter <IntValue>("EvaluatedSolutions", "The number of times solutions have been evaluated."));
            Parameters.Add(new ValueLookupParameter <BoolValue>("DominateOnEqualQualities", "Flag which determines whether solutions with equal quality values should be treated as dominated."));

            Parameters.Add(new ValueLookupParameter <IOperator>("Terminator", "The termination criteria that defines if the algorithm should continue or stop"));

            Parameters.Add(new FixedValueParameter <IntValue>("Zero", "Zero Value.", new IntValue(0)));
            Parameters.Add(new FixedValueParameter <IntValue>("One", "1 as a Value.", new IntValue(1)));

            #endregion

            #region Create operators and operator graph

            var variableCreator = new VariableCreator {
                Name = "Initialize"
            };
            var resultsCollector1          = new ResultsCollector();
            var initLayerAnalyzerProcessor = new SubScopesProcessor();
            var layerVariableCreator       = new VariableCreator {
                Name = "Initialize Layer"
            };
            var initLayerAnalyzerPlaceholder = new Placeholder {
                Name = "LayerAnalyzer (Placeholder)"
            };
            var initAnalyzerPlaceholder = new Placeholder {
                Name = "Analyzer (Placeholder)"
            };
            var initFinalAnalyzerPlaceholder = new Placeholder {
                Name = "FinalAnalyzer (Placeholder)"
            };
            var matingPoolCreator = new MatingPoolCreator {
                Name = "Create Mating Pools"
            };
            var matingPoolProcessor = new UniformSubScopesProcessor {
                Name = "Process Mating Pools"
            };
            var initializeLayer = new Assigner {
                Name = "Reset LayerEvaluatedSolutions"
            };
            var mainOperator           = new AlpsNsga2MainOperator();
            var generationsIncrementer = new IntCounter {
                Name = "Increment Generations"
            };
            var evaluatedSolutionsReducer = new DataReducer {
                Name = "Increment EvaluatedSolutions"
            };
            var eldersEmigrator = CreateEldersEmigrator();
            var layerOpener     = CreateLayerOpener();
            var layerReseeder   = CreateReseeder();
            var currentPopulationSizeComparator = new Comparator {
                Name = "Isn't CurrentPopulationSize 0?"
            };
            var currentPopulationSizeIsNotZeroBranch = new ConditionalBranch {
                Name = "CurrentPopulationSize != Zero"
            };
            var layerAnalyzerProcessor   = new UniformSubScopesProcessor();
            var layerAnalyzerPlaceholder = new Placeholder {
                Name = "LayerAnalyzer (Placeholder)"
            };
            var analyzerPlaceholder = new Placeholder {
                Name = "Analyzer (Placeholder)"
            };
            var termination           = new TerminationOperator();
            var rankAndCrowdingSorter = new RankAndCrowdingSorter();
            var mergingReducer        = new MergingReducer();
            var leftSelector          = new LeftSelector();
            var rightReducer          = new RightReducer();

            OperatorGraph.InitialOperator = variableCreator;

            variableCreator.CollectedValues.Add(new ValueParameter <IntValue>("Generations", new IntValue(0)));
            variableCreator.CollectedValues.Add(new ValueParameter <IntValue>("OpenLayers", new IntValue(1)));
            variableCreator.Successor = initLayerAnalyzerProcessor;

            initLayerAnalyzerProcessor.Operators.Add(layerVariableCreator);
            initLayerAnalyzerProcessor.Successor = initAnalyzerPlaceholder;

            layerVariableCreator.CollectedValues.Add(new ValueParameter <IntValue>("Layer", new IntValue(0)));
            layerVariableCreator.CollectedValues.Add(new ValueParameter <ResultCollection>("LayerResults"));
            layerVariableCreator.Successor = initLayerAnalyzerPlaceholder;

            initLayerAnalyzerPlaceholder.OperatorParameter.ActualName = LayerAnalyzerParameter.Name;
            initLayerAnalyzerPlaceholder.Successor = null;

            initAnalyzerPlaceholder.OperatorParameter.ActualName = AnalyzerParameter.Name;
            initAnalyzerPlaceholder.Successor = resultsCollector1;

            resultsCollector1.CollectedValues.Add(new LookupParameter <IntValue>("Generations"));
            resultsCollector1.CollectedValues.Add(new ScopeTreeLookupParameter <ResultCollection>("LayerResults", "Result set for each Layer", "LayerResults"));
            resultsCollector1.CollectedValues.Add(new LookupParameter <IntValue>("OpenLayers"));
            resultsCollector1.CopyValue = new BoolValue(false);
            resultsCollector1.ResultsParameter.ActualName = ResultsParameter.Name;
            resultsCollector1.Successor = matingPoolCreator;

            matingPoolCreator.MatingPoolRangeParameter.Value      = null;
            matingPoolCreator.MatingPoolRangeParameter.ActualName = MatingPoolRangeParameter.Name;
            matingPoolCreator.Successor = matingPoolProcessor;

            matingPoolProcessor.Parallel.Value = true;
            matingPoolProcessor.Operator       = initializeLayer;
            matingPoolProcessor.Successor      = generationsIncrementer;

            initializeLayer.LeftSideParameter.ActualName = "LayerEvaluatedSolutions";
            initializeLayer.RightSideParameter.Value     = new IntValue(0);
            initializeLayer.Successor = mainOperator;

            mainOperator.RandomParameter.ActualName               = LocalRandomParameter.Name;
            mainOperator.EvaluatorParameter.ActualName            = EvaluatorParameter.Name;
            mainOperator.EvaluatedSolutionsParameter.ActualName   = "LayerEvaluatedSolutions";
            mainOperator.QualityParameter.ActualName              = QualitiesParameter.Name;
            mainOperator.MaximizationParameter.ActualName         = MaximizationParameter.Name;
            mainOperator.PopulationSizeParameter.ActualName       = PopulationSizeParameter.Name;
            mainOperator.SelectorParameter.ActualName             = SelectorParameter.Name;
            mainOperator.CrossoverParameter.ActualName            = CrossoverParameter.Name;
            mainOperator.CrossoverProbabilityParameter.ActualName = CrossoverProbabilityParameter.Name;
            mainOperator.MutatorParameter.ActualName              = MutatorParameter.ActualName;
            mainOperator.MutationProbabilityParameter.ActualName  = MutationProbabilityParameter.Name;
            mainOperator.AgeParameter.ActualName            = AgeParameter.Name;
            mainOperator.AgeInheritanceParameter.ActualName = AgeInheritanceParameter.Name;
            mainOperator.AgeIncrementParameter.Value        = new DoubleValue(1.0);
            mainOperator.Successor = null;

            generationsIncrementer.ValueParameter.ActualName = "Generations";
            generationsIncrementer.Increment = new IntValue(1);
            generationsIncrementer.Successor = evaluatedSolutionsReducer;

            evaluatedSolutionsReducer.ParameterToReduce.ActualName = "LayerEvaluatedSolutions";
            evaluatedSolutionsReducer.TargetParameter.ActualName   = EvaluatedSolutionsParameter.Name;
            evaluatedSolutionsReducer.ReductionOperation.Value     = new ReductionOperation(ReductionOperations.Sum);
            evaluatedSolutionsReducer.TargetOperation.Value        = new ReductionOperation(ReductionOperations.Sum);
            evaluatedSolutionsReducer.Successor = eldersEmigrator;

            eldersEmigrator.Successor = layerOpener;

            layerOpener.Successor = layerReseeder;

            layerReseeder.Successor = layerAnalyzerProcessor;

            // Layer analyzer is only performed if individuals count is not 0
            layerAnalyzerProcessor.Operator  = currentPopulationSizeComparator;
            layerAnalyzerProcessor.Successor = analyzerPlaceholder;

            currentPopulationSizeComparator.LeftSideParameter.ActualName  = CurrentPopulationSizeParameter.Name;
            currentPopulationSizeComparator.RightSideParameter.ActualName = ZeroParameter.Name;
            currentPopulationSizeComparator.ResultParameter.ActualName    = "CurrentPopulationSizeIsNotZero";
            currentPopulationSizeComparator.Comparison = new Comparison(ComparisonType.NotEqual);
            currentPopulationSizeComparator.Successor  = currentPopulationSizeIsNotZeroBranch;

            currentPopulationSizeIsNotZeroBranch.ConditionParameter.ActualName = "CurrentPopulationSizeIsNotZero";
            currentPopulationSizeIsNotZeroBranch.TrueBranch = layerAnalyzerPlaceholder;

            layerAnalyzerPlaceholder.OperatorParameter.ActualName = LayerAnalyzerParameter.Name;

            analyzerPlaceholder.OperatorParameter.ActualName = AnalyzerParameter.Name;
            analyzerPlaceholder.Successor = termination;

            termination.TerminatorParameter.ActualName = TerminatorParameter.Name;
            termination.ContinueBranch = matingPoolCreator;

            termination.TerminateBranch = mergingReducer;
            mergingReducer.Successor    = rankAndCrowdingSorter;

            rankAndCrowdingSorter.DominateOnEqualQualitiesParameter.ActualName = DominateOnEqualQualitiesParameter.Name;
            rankAndCrowdingSorter.CrowdingDistanceParameter.ActualName         = "CrowdingDistance";
            rankAndCrowdingSorter.RankParameter.ActualName = "Rank";
            rankAndCrowdingSorter.Successor = leftSelector;

            leftSelector.CopySelected = new BoolValue(false);
            leftSelector.NumberOfSelectedSubScopesParameter.ActualName = PopulationSizeParameter.Name;
            leftSelector.Successor = rightReducer;

            rightReducer.Successor = initFinalAnalyzerPlaceholder;

            initFinalAnalyzerPlaceholder.OperatorParameter.ActualName = FinalAnalyzerParameter.Name;

            #endregion
        }
        public AlpsNsga2MainOperator() : base()
        {
            Parameters.Add(new ValueLookupParameter <IRandom>("Random", "A pseudo random number generator."));

            Parameters.Add(new ValueLookupParameter <IOperator>("Evaluator", "The operator used to evaluate solutions. This operator is executed in parallel, if an engine is used which supports parallelization."));
            Parameters.Add(new ValueLookupParameter <IntValue>("EvaluatedSolutions", "The number of times solutions have been evaluated."));
            Parameters.Add(new ScopeTreeLookupParameter <DoubleValue>("Quality", "The value which represents the quality of a solution."));
            Parameters.Add(new ValueLookupParameter <BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));

            Parameters.Add(new ValueLookupParameter <IntValue>("PopulationSize", "The size of the population of solutions in each layer."));
            Parameters.Add(new ValueLookupParameter <IOperator>("Selector", "The operator used to select solutions for reproduction."));

            Parameters.Add(new ValueLookupParameter <IOperator>("Crossover", "The operator used to cross solutions."));
            Parameters.Add(new ValueLookupParameter <PercentValue>("CrossoverProbability", "The probability that the crossover operator is applied on a solution."));
            Parameters.Add(new ValueLookupParameter <IOperator>("Mutator", "The operator used to mutate solutions."));
            Parameters.Add(new ValueLookupParameter <PercentValue>("MutationProbability", "The probability that the mutation operator is applied on a solution."));

            Parameters.Add(new ScopeTreeLookupParameter <DoubleValue>("Age", "The age of individuals."));
            Parameters.Add(new ValueLookupParameter <DoubleValue>("AgeInheritance", "A weight that determines the age of a child after crossover based on the older (1.0) and younger (0.0) parent."));
            Parameters.Add(new ValueLookupParameter <DoubleValue>("AgeIncrement", "The value the age the individuals is incremented if they survives a generation."));

            Parameters.Add(new ValueLookupParameter <BoolValue>("DominateOnEqualQualities", "Flag which determines whether solutions with equal quality values should be treated as dominated."));

            var selector = new Placeholder {
                Name = "Selector (Placeholder)"
            };
            var subScopesProcessor1        = new SubScopesProcessor();
            var childrenCreator            = new ChildrenCreator();
            var uniformSubScopesProcessor1 = new UniformSubScopesProcessor();
            var crossoverStochasticBranch  = new StochasticBranch {
                Name = "CrossoverProbability"
            };
            var crossover = new Placeholder {
                Name = "Crossover (Placeholder)"
            };
            var noCrossover = new ParentCopyCrossover();
            var mutationStochasticBranch = new StochasticBranch {
                Name = "MutationProbability"
            };
            var mutator = new Placeholder {
                Name = "Mutator (Placeholder)"
            };
            var ageCalculator = new WeightingReducer {
                Name = "Calculate Age"
            };
            var subScopesRemover           = new SubScopesRemover();
            var uniformSubScopesProcessor2 = new UniformSubScopesProcessor();
            var evaluator = new Placeholder {
                Name = "Evaluator (Placeholder)"
            };
            var subScopesCounter = new SubScopesCounter {
                Name = "Increment EvaluatedSolutions"
            };
            var mergingReducer         = new MergingReducer();
            var rankAndCrowdingSorter1 = new RankAndCrowdingSorter();
            var rankAndCrowdingSorter2 = new RankAndCrowdingSorter();
            var leftSelector           = new LeftSelector();
            var rightReducer           = new RightReducer();
            var incrementAgeProcessor  = new UniformSubScopesProcessor();
            var ageIncrementer         = new DoubleCounter {
                Name = "Increment Age"
            };

            OperatorGraph.InitialOperator = rankAndCrowdingSorter1;

            rankAndCrowdingSorter1.DominateOnEqualQualitiesParameter.ActualName = DominateOnEqualQualitiesParameter.Name;
            rankAndCrowdingSorter1.CrowdingDistanceParameter.ActualName         = "CrowdingDistance";
            rankAndCrowdingSorter1.RankParameter.ActualName = "Rank";
            rankAndCrowdingSorter1.Successor = selector;

            selector.OperatorParameter.ActualName = SelectorParameter.Name;
            selector.Successor = subScopesProcessor1;

            subScopesProcessor1.Operators.Add(new EmptyOperator());
            subScopesProcessor1.Operators.Add(childrenCreator);
            subScopesProcessor1.Successor = mergingReducer;

            childrenCreator.ParentsPerChild = new IntValue(2);
            childrenCreator.Successor       = uniformSubScopesProcessor1;

            uniformSubScopesProcessor1.Operator  = crossoverStochasticBranch;
            uniformSubScopesProcessor1.Successor = uniformSubScopesProcessor2;

            crossoverStochasticBranch.ProbabilityParameter.ActualName = CrossoverProbabilityParameter.Name;
            crossoverStochasticBranch.RandomParameter.ActualName      = RandomParameter.Name;
            crossoverStochasticBranch.FirstBranch  = crossover;
            crossoverStochasticBranch.SecondBranch = noCrossover;
            crossoverStochasticBranch.Successor    = mutationStochasticBranch;

            crossover.Name = "Crossover";
            crossover.OperatorParameter.ActualName = CrossoverParameter.Name;
            crossover.Successor = null;

            noCrossover.Name = "Clone parent";
            noCrossover.RandomParameter.ActualName = RandomParameter.Name;
            noCrossover.Successor = null;

            mutationStochasticBranch.ProbabilityParameter.ActualName = MutationProbabilityParameter.Name;
            mutationStochasticBranch.RandomParameter.ActualName      = RandomParameter.Name;
            mutationStochasticBranch.FirstBranch  = mutator;
            mutationStochasticBranch.SecondBranch = null;
            mutationStochasticBranch.Successor    = ageCalculator;

            mutator.Name = "Mutator";
            mutator.OperatorParameter.ActualName = MutatorParameter.Name;
            mutator.Successor = null;

            ageCalculator.ParameterToReduce.ActualName = AgeParameter.Name;
            ageCalculator.TargetParameter.ActualName   = AgeParameter.Name;
            ageCalculator.WeightParameter.ActualName   = AgeInheritanceParameter.Name;
            ageCalculator.Successor = subScopesRemover;

            subScopesRemover.RemoveAllSubScopes = true;
            subScopesRemover.Successor          = null;

            uniformSubScopesProcessor2.Parallel.Value = true;
            uniformSubScopesProcessor2.Operator       = evaluator;
            uniformSubScopesProcessor2.Successor      = subScopesCounter;

            evaluator.OperatorParameter.ActualName = EvaluatorParameter.Name;
            evaluator.Successor = null;

            subScopesCounter.ValueParameter.ActualName = EvaluatedSolutionsParameter.Name;
            subScopesCounter.AccumulateParameter.Value = new BoolValue(true);
            subScopesCounter.Successor = null;

            mergingReducer.Successor = rankAndCrowdingSorter2;

            rankAndCrowdingSorter2.DominateOnEqualQualitiesParameter.ActualName = DominateOnEqualQualitiesParameter.Name;
            rankAndCrowdingSorter2.CrowdingDistanceParameter.ActualName         = "CrowdingDistance";
            rankAndCrowdingSorter2.RankParameter.ActualName = "Rank";
            rankAndCrowdingSorter2.Successor = leftSelector;

            leftSelector.CopySelected = new BoolValue(false);
            leftSelector.NumberOfSelectedSubScopesParameter.ActualName = PopulationSizeParameter.Name;
            leftSelector.Successor = rightReducer;

            rightReducer.Successor = incrementAgeProcessor;

            incrementAgeProcessor.Operator  = ageIncrementer;
            incrementAgeProcessor.Successor = null;

            ageIncrementer.ValueParameter.ActualName     = AgeParameter.Name;
            ageIncrementer.IncrementParameter.Value      = null;
            ageIncrementer.IncrementParameter.ActualName = AgeIncrementParameter.Name;
            ageIncrementer.Successor = null;
        }