[13095] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System.Linq;
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| 23 | using HeuristicLab.Algorithms.GeneticAlgorithm;
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| 24 | using HeuristicLab.Data;
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| 25 | using HeuristicLab.Operators;
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| 26 | using HeuristicLab.Optimization;
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| 27 | using HeuristicLab.Optimization.Operators;
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| 28 | using HeuristicLab.Parameters;
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| 29 | using HeuristicLab.Selection;
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| 30 |
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| 31 | namespace HeuristicLab.Algorithms.ALPS {
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| 32 | public static class AlpsGeneticAlgorithmMainOperator {
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| 33 | public static GeneticAlgorithmMainLoop Create() {
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| 34 | var mainLoop = new GeneticAlgorithmMainLoop();
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| 35 |
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| 36 | var selector = mainLoop.OperatorGraph.Iterate().OfType<Placeholder>().First(o => o.OperatorParameter.ActualName == "Selector");
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| 37 | var crossover = mainLoop.OperatorGraph.Iterate().OfType<Placeholder>().First(o => o.OperatorParameter.ActualName == "Crossover");
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| 38 | var subScopesCounter = mainLoop.OperatorGraph.Iterate().OfType<SubScopesCounter>().First();
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| 39 | var elitesMerger = mainLoop.OperatorGraph.Iterate().OfType<MergingReducer>().First();
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| 40 |
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| 41 | // Operator starts with calculating number of selected scopes base on plus/comma-selection replacement scheme
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[13096] | 42 | var numberOfSelectedSubScopesCalculator = new ExpressionCalculator() { Name = "NumberOfSelectedSubScopes = 2 * (PopulationSize - if PlusSelection then 0 else Elites)" };
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[13095] | 43 | var replacementBranch = new ConditionalBranch() { Name = "PlusSelection?" };
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| 44 |
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| 45 | // Set new initial operator
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[13096] | 46 | mainLoop.OperatorGraph.InitialOperator = numberOfSelectedSubScopesCalculator;
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[13095] | 47 |
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| 48 | numberOfSelectedSubScopesCalculator.CollectedValues.Add(new LookupParameter<IntValue>("PopulationSize"));
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| 49 | numberOfSelectedSubScopesCalculator.CollectedValues.Add(new LookupParameter<IntValue>("Elites"));
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[13096] | 50 | numberOfSelectedSubScopesCalculator.CollectedValues.Add(new LookupParameter<BoolValue>("PlusSelection"));
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[13095] | 51 | numberOfSelectedSubScopesCalculator.ExpressionResultParameter.ActualName = "NumberOfSelectedSubScopes";
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[13096] | 52 | numberOfSelectedSubScopesCalculator.ExpressionParameter.Value = new StringValue("PopulationSize 0 Elites PlusSelection if - 2 * toint");
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| 53 | numberOfSelectedSubScopesCalculator.Successor = selector;
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[13095] | 54 |
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| 55 | // Use Elitism or Plus-Selection as replacement strategy
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| 56 | var selectedProcessor = (SubScopesProcessor)selector.Successor;
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| 57 | var elitismReplacement = selectedProcessor.Successor;
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| 58 | selectedProcessor.Successor = replacementBranch;
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| 59 | replacementBranch.ConditionParameter.ActualName = "PlusSelection";
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| 60 | replacementBranch.FalseBranch = elitismReplacement;
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| 61 |
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| 62 | // Plus selection replacement
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| 63 | var replacementMergingReducer = new MergingReducer();
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| 64 | var replacementBestSelector = new BestSelector();
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| 65 | var replacementRightReducer = new RightReducer();
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| 66 | replacementBranch.TrueBranch = replacementMergingReducer;
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| 67 |
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| 68 | replacementMergingReducer.Successor = replacementBestSelector;
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| 69 |
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| 70 | replacementBestSelector.NumberOfSelectedSubScopesParameter.ActualName = "PopulationSize";
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| 71 | replacementBestSelector.CopySelected = new BoolValue(false);
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| 72 | replacementBestSelector.Successor = replacementRightReducer;
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| 73 |
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| 74 | replacementRightReducer.Successor = null;
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| 75 |
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| 76 | // Increment ages of all individuals after replacement
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| 77 | var incrementAgeProcessor = new UniformSubScopesProcessor();
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| 78 | var ageIncrementor = new DoubleCounter() { Name = "Increment Age" };
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| 79 | replacementBranch.Successor = incrementAgeProcessor;
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| 80 | incrementAgeProcessor.Operator = ageIncrementor;
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| 81 | incrementAgeProcessor.Successor = null;
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| 82 | ageIncrementor.ValueParameter.ActualName = "Age";
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| 83 | ageIncrementor.Increment = new DoubleValue(1.0);
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| 84 |
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| 85 | // Insert AgeCalculator between crossover and its successor
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| 86 | var crossoverSuccessor = crossover.Successor;
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| 87 | var ageCalculator = new WeightingReducer() { Name = "Calculate Age" };
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| 88 | crossover.Successor = ageCalculator;
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| 89 |
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| 90 | ageCalculator.ParameterToReduce.ActualName = "Age";
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| 91 | ageCalculator.TargetParameter.ActualName = "Age";
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| 92 | ageCalculator.WeightParameter.ActualName = "AgeInheritance";
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| 93 | ageCalculator.Successor = crossoverSuccessor;
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| 94 |
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| 95 | // When counting the evaluated solutions, write in LayerEvaluatedSolutions
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| 96 | subScopesCounter.ValueParameter.ActualName = "LayerEvaluatedSolutions";
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| 97 | subScopesCounter.AccumulateParameter.Value = new BoolValue(false);
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| 98 |
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| 99 | // Instead of generational loop after merging of elites, stop
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| 100 | elitesMerger.Successor = null;
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| 101 |
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| 102 | // Parameterize
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| 103 | foreach (var stochasticOperator in mainLoop.OperatorGraph.Iterate().OfType<IStochasticOperator>())
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| 104 | stochasticOperator.RandomParameter.ActualName = "LocalRandom";
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| 105 | foreach (var stochasticBranch in mainLoop.OperatorGraph.Iterate().OfType<StochasticBranch>())
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| 106 | stochasticBranch.RandomParameter.ActualName = "LocalRandom";
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| 107 |
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| 108 | // Remove unused operators
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| 109 | var usedOperators = mainLoop.OperatorGraph.Iterate();
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| 110 | var unusedOperators = mainLoop.OperatorGraph.Operators.Except(usedOperators);
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| 111 | foreach (var op in unusedOperators.ToList())
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| 112 | mainLoop.OperatorGraph.Operators.Remove(op);
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| 113 |
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| 114 | return mainLoop;
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| 115 | }
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| 116 | }
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| 117 | } |
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