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source: stable/HeuristicLab.Algorithms.LocalSearch/3.3/LocalSearchMainLoop.cs @ 10972

Last change on this file since 10972 was 9456, checked in by swagner, 12 years ago

Updated copyright year and added some missing license headers (#1889)
File size: 13.4 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2013 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 LookupParameter<DoubleValue> BestLocalQualityParameter {
49      get { return (LookupParameter<DoubleValue>)Parameters["BestLocalQuality"]; }
50    }
51    public ValueLookupParameter<DoubleValue> BestKnownQualityParameter {
52      get { return (ValueLookupParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
53    }
54    public LookupParameter<DoubleValue> MoveQualityParameter {
55      get { return (LookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
56    }
57    public LookupParameter<IntValue> IterationsParameter {
58      get { return (LookupParameter<IntValue>)Parameters["Iterations"]; }
59    }
60    public ValueLookupParameter<IntValue> MaximumIterationsParameter {
61      get { return (ValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
62    }
63    public ValueLookupParameter<VariableCollection> ResultsParameter {
64      get { return (ValueLookupParameter<VariableCollection>)Parameters["Results"]; }
65    }
66    public ValueLookupParameter<IOperator> MoveGeneratorParameter {
67      get { return (ValueLookupParameter<IOperator>)Parameters["MoveGenerator"]; }
68    }
69    public ValueLookupParameter<IOperator> MoveEvaluatorParameter {
70      get { return (ValueLookupParameter<IOperator>)Parameters["MoveEvaluator"]; }
71    }
72    public ValueLookupParameter<IOperator> MoveMakerParameter {
73      get { return (ValueLookupParameter<IOperator>)Parameters["MoveMaker"]; }
74    }
75    public ValueLookupParameter<IOperator> AnalyzerParameter {
76      get { return (ValueLookupParameter<IOperator>)Parameters["Analyzer"]; }
77    }
78    public LookupParameter<IntValue> EvaluatedMovesParameter {
79      get { return (LookupParameter<IntValue>)Parameters["EvaluatedMoves"]; }
80    }
81    #endregion
82
83    [StorableConstructor]
84    private LocalSearchMainLoop(bool deserializing) : base(deserializing) { }
85    public LocalSearchMainLoop()
86      : base() {
87      Initialize();
88    }
89    private LocalSearchMainLoop(LocalSearchMainLoop original, Cloner cloner)
90      : base(original, cloner) {
91    }
92    public override IDeepCloneable Clone(Cloner cloner) {
93      return new LocalSearchMainLoop(this, cloner);
94    }
95
96    private void Initialize() {
97      #region Create parameters
98      Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
99      Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
100      Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The value which represents the quality of a solution."));
101      Parameters.Add(new LookupParameter<DoubleValue>("BestLocalQuality", "The value which represents the best quality found so far."));
102      Parameters.Add(new ValueLookupParameter<DoubleValue>("BestKnownQuality", "The problem's best known quality value found so far."));
103      Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", "The value which represents the quality of a move."));
104      Parameters.Add(new LookupParameter<IntValue>("Iterations", "The number of iterations performed."));
105      Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed."));
106      Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
107
108      Parameters.Add(new ValueLookupParameter<IOperator>("MoveGenerator", "The operator that generates the moves."));
109      Parameters.Add(new ValueLookupParameter<IOperator>("MoveMaker", "The operator that performs a move and updates the quality."));
110      Parameters.Add(new ValueLookupParameter<IOperator>("MoveEvaluator", "The operator that evaluates a move."));
111
112      Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The operator used to analyze the solution and moves."));
113      Parameters.Add(new LookupParameter<IntValue>("EvaluatedMoves", "The number of evaluated moves."));
114      #endregion
115
116      #region Create operators
117      SubScopesProcessor subScopesProcessor0 = new SubScopesProcessor();
118      Assigner bestQualityInitializer = new Assigner();
119      Placeholder analyzer1 = new Placeholder();
120      ResultsCollector resultsCollector1 = new ResultsCollector();
121      SubScopesProcessor mainProcessor = new SubScopesProcessor();
122      Placeholder moveGenerator = new Placeholder();
123      UniformSubScopesProcessor moveEvaluationProcessor = new UniformSubScopesProcessor();
124      Placeholder moveEvaluator = new Placeholder();
125      SubScopesCounter subScopesCounter = new SubScopesCounter();
126      BestSelector bestSelector = new BestSelector();
127      SubScopesProcessor moveMakingProcessor = new SubScopesProcessor();
128      UniformSubScopesProcessor selectedMoveMakingProcessor = new UniformSubScopesProcessor();
129      QualityComparator qualityComparator = new QualityComparator();
130      ConditionalBranch improvesQualityBranch = new ConditionalBranch();
131      Placeholder moveMaker = new Placeholder();
132      Assigner bestQualityUpdater = new Assigner();
133      ResultsCollector resultsCollector2 = new ResultsCollector();
134      MergingReducer mergingReducer = new MergingReducer();
135      Placeholder analyzer2 = new Placeholder();
136      SubScopesRemover subScopesRemover = new SubScopesRemover();
137      IntCounter iterationsCounter = new IntCounter();
138      Comparator iterationsComparator = new Comparator();
139      ConditionalBranch iterationsTermination = new ConditionalBranch();
140
141      bestQualityInitializer.Name = "Initialize BestQuality";
142      bestQualityInitializer.LeftSideParameter.ActualName = BestLocalQualityParameter.Name;
143      bestQualityInitializer.RightSideParameter.ActualName = QualityParameter.Name;
144
145      analyzer1.Name = "Analyzer (placeholder)";
146      analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
147
148      resultsCollector1.CopyValue = new BoolValue(false);
149      resultsCollector1.CollectedValues.Add(new LookupParameter<IntValue>(IterationsParameter.Name));
150      resultsCollector1.CollectedValues.Add(new LookupParameter<DoubleValue>(BestLocalQualityParameter.Name, null, BestLocalQualityParameter.Name));
151      resultsCollector1.ResultsParameter.ActualName = ResultsParameter.Name;
152
153      moveGenerator.Name = "MoveGenerator (placeholder)";
154      moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
155
156      moveEvaluationProcessor.Parallel = new BoolValue(true);
157
158      moveEvaluator.Name = "MoveEvaluator (placeholder)";
159      moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
160
161      subScopesCounter.Name = "Increment EvaluatedMoves";
162      subScopesCounter.ValueParameter.ActualName = EvaluatedMovesParameter.Name;
163
164      bestSelector.CopySelected = new BoolValue(false);
165      bestSelector.MaximizationParameter.ActualName = MaximizationParameter.Name;
166      bestSelector.NumberOfSelectedSubScopesParameter.Value = new IntValue(1);
167      bestSelector.QualityParameter.ActualName = MoveQualityParameter.Name;
168
169      qualityComparator.LeftSideParameter.ActualName = MoveQualityParameter.Name;
170      qualityComparator.RightSideParameter.ActualName = QualityParameter.Name;
171      qualityComparator.ResultParameter.ActualName = "IsBetter";
172
173      improvesQualityBranch.ConditionParameter.ActualName = "IsBetter";
174
175      moveMaker.Name = "MoveMaker (placeholder)";
176      moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
177
178      bestQualityUpdater.Name = "Update BestQuality";
179      bestQualityUpdater.LeftSideParameter.ActualName = BestLocalQualityParameter.Name;
180      bestQualityUpdater.RightSideParameter.ActualName = QualityParameter.Name;
181
182      resultsCollector2.CopyValue = new BoolValue(false);
183      resultsCollector2.CollectedValues.Add(new LookupParameter<DoubleValue>(BestLocalQualityParameter.Name, null, BestLocalQualityParameter.Name));
184      resultsCollector2.ResultsParameter.ActualName = ResultsParameter.Name;
185
186      analyzer2.Name = "Analyzer (placeholder)";
187      analyzer2.OperatorParameter.ActualName = AnalyzerParameter.Name;
188
189      subScopesRemover.RemoveAllSubScopes = true;
190
191      iterationsCounter.Name = "Iterations Counter";
192      iterationsCounter.Increment = new IntValue(1);
193      iterationsCounter.ValueParameter.ActualName = IterationsParameter.Name;
194
195      iterationsComparator.Name = "Iterations >= MaximumIterations";
196      iterationsComparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
197      iterationsComparator.LeftSideParameter.ActualName = IterationsParameter.Name;
198      iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
199      iterationsComparator.ResultParameter.ActualName = "Terminate";
200
201      iterationsTermination.Name = "Iterations Termination Condition";
202      iterationsTermination.ConditionParameter.ActualName = "Terminate";
203      #endregion
204
205      #region Create operator graph
206      OperatorGraph.InitialOperator = subScopesProcessor0; // don't change this without adapting the constructor of LocalSearchImprovementOperator
207      subScopesProcessor0.Operators.Add(bestQualityInitializer);
208      subScopesProcessor0.Successor = resultsCollector1;
209      bestQualityInitializer.Successor = analyzer1;
210      analyzer1.Successor = null;
211      resultsCollector1.Successor = mainProcessor;
212      mainProcessor.Operators.Add(moveGenerator);
213      mainProcessor.Successor = iterationsCounter;
214      moveGenerator.Successor = moveEvaluationProcessor;
215      moveEvaluationProcessor.Operator = moveEvaluator;
216      moveEvaluationProcessor.Successor = subScopesCounter;
217      moveEvaluator.Successor = null;
218      subScopesCounter.Successor = bestSelector;
219      bestSelector.Successor = moveMakingProcessor;
220      moveMakingProcessor.Operators.Add(new EmptyOperator());
221      moveMakingProcessor.Operators.Add(selectedMoveMakingProcessor);
222      moveMakingProcessor.Successor = mergingReducer;
223      selectedMoveMakingProcessor.Operator = qualityComparator;
224      qualityComparator.Successor = improvesQualityBranch;
225      improvesQualityBranch.TrueBranch = moveMaker;
226      improvesQualityBranch.FalseBranch = null;
227      improvesQualityBranch.Successor = null;
228      moveMaker.Successor = bestQualityUpdater;
229      bestQualityUpdater.Successor = null;
230      mergingReducer.Successor = analyzer2;
231      analyzer2.Successor = subScopesRemover;
232      subScopesRemover.Successor = null;
233      iterationsCounter.Successor = iterationsComparator;
234      iterationsComparator.Successor = iterationsTermination;
235      iterationsTermination.TrueBranch = null;
236      iterationsTermination.FalseBranch = mainProcessor;
237      #endregion
238    }
239
240    public override IOperation Apply() {
241      if (MoveGeneratorParameter.ActualValue == null || MoveEvaluatorParameter.ActualValue == null || MoveMakerParameter.ActualValue == null)
242        return null;
243      return base.Apply();
244    }
245
246    [StorableHook(HookType.AfterDeserialization)]
247    private void AfterDeserialization() {
248      // BackwardsCompatibility3.3
249      #region Backwards compatible code, remove with 3.4
250      if (!Parameters.ContainsKey("BestLocalQuality"))
251        Parameters.Add(new LookupParameter<DoubleValue>("BestLocalQuality", "The value which represents the best quality found so far."));
252      if (!Parameters.ContainsKey("Iterations"))
253        Parameters.Add(new LookupParameter<IntValue>("Iterations", "The number of iterations performed."));
254      #endregion
255    }
256  }
257}
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