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source: trunk/sources/HeuristicLab.Algorithms.LocalSearch/3.3/LocalSearchMainLoop.cs @ 5594

Last change on this file since 5594 was 5445, checked in by swagner, 14 years ago

Updated year of copyrights (#1406)
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Data;
25using HeuristicLab.Operators;
26using HeuristicLab.Optimization.Operators;
27using HeuristicLab.Parameters;
28using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
29using HeuristicLab.Selection;
30
31namespace HeuristicLab.Algorithms.LocalSearch {
32  /// <summary>
33  /// An operator which represents a local search.
34  /// </summary>
35  [Item("LocalSearchMainLoop", "An operator which represents the main loop of a best improvement local search (if only a single move is generated in each iteration it is a first improvement local search).")]
36  [StorableClass]
37  public sealed class LocalSearchMainLoop : AlgorithmOperator {
38    #region Parameter properties
39    public ValueLookupParameter<IRandom> RandomParameter {
40      get { return (ValueLookupParameter<IRandom>)Parameters["Random"]; }
41    }
42    public ValueLookupParameter<BoolValue> MaximizationParameter {
43      get { return (ValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
44    }
45    public LookupParameter<DoubleValue> QualityParameter {
46      get { return (LookupParameter<DoubleValue>)Parameters["Quality"]; }
47    }
48    public ValueLookupParameter<DoubleValue> BestKnownQualityParameter {
49      get { return (ValueLookupParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
50    }
51    public LookupParameter<DoubleValue> MoveQualityParameter {
52      get { return (LookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
53    }
54    public ValueLookupParameter<IntValue> MaximumIterationsParameter {
55      get { return (ValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
56    }
57    public ValueLookupParameter<VariableCollection> ResultsParameter {
58      get { return (ValueLookupParameter<VariableCollection>)Parameters["Results"]; }
59    }
60    public ValueLookupParameter<IOperator> MoveGeneratorParameter {
61      get { return (ValueLookupParameter<IOperator>)Parameters["MoveGenerator"]; }
62    }
63    public ValueLookupParameter<IOperator> MoveEvaluatorParameter {
64      get { return (ValueLookupParameter<IOperator>)Parameters["MoveEvaluator"]; }
65    }
66    public ValueLookupParameter<IOperator> MoveMakerParameter {
67      get { return (ValueLookupParameter<IOperator>)Parameters["MoveMaker"]; }
68    }
69    public ValueLookupParameter<IOperator> AnalyzerParameter {
70      get { return (ValueLookupParameter<IOperator>)Parameters["Analyzer"]; }
71    }
72    public LookupParameter<IntValue> EvaluatedMovesParameter {
73      get { return (LookupParameter<IntValue>)Parameters["EvaluatedMoves"]; }
74    }
75    #endregion
76
77    [StorableConstructor]
78    private LocalSearchMainLoop(bool deserializing) : base(deserializing) { }
79    public LocalSearchMainLoop()
80      : base() {
81      Initialize();
82    }
83    private LocalSearchMainLoop(LocalSearchMainLoop original, Cloner cloner)
84      : base(original, cloner) {
85    }
86    public override IDeepCloneable Clone(Cloner cloner) {
87      return new LocalSearchMainLoop(this, cloner);
88    }
89
90    private void Initialize() {
91      #region Create parameters
92      Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
93      Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
94      Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The value which represents the quality of a solution."));
95      Parameters.Add(new ValueLookupParameter<DoubleValue>("BestKnownQuality", "The best known quality value found so far."));
96      Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", "The value which represents the quality of a move."));
97      Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed."));
98      Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
99
100      Parameters.Add(new ValueLookupParameter<IOperator>("MoveGenerator", "The operator that generates the moves."));
101      Parameters.Add(new ValueLookupParameter<IOperator>("MoveMaker", "The operator that performs a move and updates the quality."));
102      Parameters.Add(new ValueLookupParameter<IOperator>("MoveEvaluator", "The operator that evaluates a move."));
103
104      Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The operator used to analyze the solution and moves."));
105      Parameters.Add(new LookupParameter<IntValue>("EvaluatedMoves", "The number of evaluated moves."));
106      #endregion
107
108      #region Create operators
109      VariableCreator variableCreator = new VariableCreator();
110      SubScopesProcessor subScopesProcessor0 = new SubScopesProcessor();
111      Assigner bestQualityInitializer = new Assigner();
112      Placeholder analyzer1 = new Placeholder();
113      ResultsCollector resultsCollector1 = new ResultsCollector();
114      SubScopesProcessor mainProcessor = new SubScopesProcessor();
115      Placeholder moveGenerator = new Placeholder();
116      UniformSubScopesProcessor moveEvaluationProcessor = new UniformSubScopesProcessor();
117      Placeholder moveEvaluator = new Placeholder();
118      SubScopesCounter subScopesCounter = new SubScopesCounter();
119      BestSelector bestSelector = new BestSelector();
120      SubScopesProcessor moveMakingProcessor = new SubScopesProcessor();
121      UniformSubScopesProcessor selectedMoveMakingProcessor = new UniformSubScopesProcessor();
122      QualityComparator qualityComparator = new QualityComparator();
123      ConditionalBranch improvesQualityBranch = new ConditionalBranch();
124      Placeholder moveMaker = new Placeholder();
125      Assigner bestQualityUpdater = new Assigner();
126      MergingReducer mergingReducer = new MergingReducer();
127      Placeholder analyzer2 = new Placeholder();
128      SubScopesRemover subScopesRemover = new SubScopesRemover();
129      IntCounter iterationsCounter = new IntCounter();
130      Comparator iterationsComparator = new Comparator();
131      ConditionalBranch iterationsTermination = new ConditionalBranch();
132
133      variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0))); // Class LocalSearch expects this to be called Iterations
134      variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("BestQuality", new DoubleValue(0)));
135
136      bestQualityInitializer.Name = "Initialize BestQuality";
137      bestQualityInitializer.LeftSideParameter.ActualName = "BestQuality";
138      bestQualityInitializer.RightSideParameter.ActualName = QualityParameter.Name;
139
140      analyzer1.Name = "Analyzer (placeholder)";
141      analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
142
143      resultsCollector1.CopyValue = new BoolValue(false);
144      resultsCollector1.CollectedValues.Add(new LookupParameter<IntValue>("Iterations"));
145      resultsCollector1.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Quality", null, "BestQuality"));
146      resultsCollector1.ResultsParameter.ActualName = ResultsParameter.Name;
147
148      moveGenerator.Name = "MoveGenerator (placeholder)";
149      moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
150
151      moveEvaluationProcessor.Parallel = new BoolValue(true);
152
153      moveEvaluator.Name = "MoveEvaluator (placeholder)";
154      moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
155
156      subScopesCounter.Name = "Increment EvaluatedMoves";
157      subScopesCounter.ValueParameter.ActualName = EvaluatedMovesParameter.Name;
158
159      bestSelector.CopySelected = new BoolValue(false);
160      bestSelector.MaximizationParameter.ActualName = MaximizationParameter.Name;
161      bestSelector.NumberOfSelectedSubScopesParameter.Value = new IntValue(1);
162      bestSelector.QualityParameter.ActualName = MoveQualityParameter.Name;
163
164      qualityComparator.LeftSideParameter.ActualName = MoveQualityParameter.Name;
165      qualityComparator.RightSideParameter.ActualName = QualityParameter.Name;
166      qualityComparator.ResultParameter.ActualName = "IsBetter";
167
168      improvesQualityBranch.ConditionParameter.ActualName = "IsBetter";
169
170      moveMaker.Name = "MoveMaker (placeholder)";
171      moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
172
173      bestQualityUpdater.Name = "Update BestQuality";
174      bestQualityUpdater.LeftSideParameter.ActualName = "BestQuality";
175      bestQualityUpdater.RightSideParameter.ActualName = QualityParameter.Name;
176
177      analyzer2.Name = "Analyzer (placeholder)";
178      analyzer2.OperatorParameter.ActualName = AnalyzerParameter.Name;
179
180      subScopesRemover.RemoveAllSubScopes = true;
181
182      iterationsCounter.Name = "Iterations Counter";
183      iterationsCounter.Increment = new IntValue(1);
184      iterationsCounter.ValueParameter.ActualName = "Iterations";
185
186      iterationsComparator.Name = "Iterations >= MaximumIterations";
187      iterationsComparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
188      iterationsComparator.LeftSideParameter.ActualName = "Iterations";
189      iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
190      iterationsComparator.ResultParameter.ActualName = "Terminate";
191
192      iterationsTermination.Name = "Iterations Termination Condition";
193      iterationsTermination.ConditionParameter.ActualName = "Terminate";
194      #endregion
195
196      #region Create operator graph
197      OperatorGraph.InitialOperator = variableCreator;
198      variableCreator.Successor = subScopesProcessor0;
199      subScopesProcessor0.Operators.Add(bestQualityInitializer);
200      subScopesProcessor0.Successor = resultsCollector1;
201      bestQualityInitializer.Successor = analyzer1;
202      analyzer1.Successor = null;
203      resultsCollector1.Successor = mainProcessor;
204      mainProcessor.Operators.Add(moveGenerator);
205      mainProcessor.Successor = iterationsCounter;
206      moveGenerator.Successor = moveEvaluationProcessor;
207      moveEvaluationProcessor.Operator = moveEvaluator;
208      moveEvaluationProcessor.Successor = subScopesCounter;
209      moveEvaluator.Successor = null;
210      subScopesCounter.Successor = bestSelector;
211      bestSelector.Successor = moveMakingProcessor;
212      moveMakingProcessor.Operators.Add(new EmptyOperator());
213      moveMakingProcessor.Operators.Add(selectedMoveMakingProcessor);
214      moveMakingProcessor.Successor = mergingReducer;
215      selectedMoveMakingProcessor.Operator = qualityComparator;
216      qualityComparator.Successor = improvesQualityBranch;
217      improvesQualityBranch.TrueBranch = moveMaker;
218      improvesQualityBranch.FalseBranch = null;
219      improvesQualityBranch.Successor = null;
220      moveMaker.Successor = bestQualityUpdater;
221      bestQualityUpdater.Successor = null;
222      mergingReducer.Successor = analyzer2;
223      analyzer2.Successor = subScopesRemover;
224      subScopesRemover.Successor = null;
225      iterationsCounter.Successor = iterationsComparator;
226      iterationsComparator.Successor = iterationsTermination;
227      iterationsTermination.TrueBranch = null;
228      iterationsTermination.FalseBranch = mainProcessor;
229      #endregion
230    }
231
232    public override IOperation Apply() {
233      if (MoveGeneratorParameter.ActualValue == null || MoveEvaluatorParameter.ActualValue == null || MoveMakerParameter.ActualValue == null)
234        return null;
235      return base.Apply();
236    }
237  }
238}
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