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 |
|
---|
22 | using System;
|
---|
23 | using System.Linq;
|
---|
24 | using HeuristicLab.Analysis;
|
---|
25 | using HeuristicLab.Common;
|
---|
26 | using HeuristicLab.Core;
|
---|
27 | using HeuristicLab.Data;
|
---|
28 | using HeuristicLab.Operators;
|
---|
29 | using HeuristicLab.Optimization;
|
---|
30 | using HeuristicLab.Parameters;
|
---|
31 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
|
---|
32 |
|
---|
33 | namespace HeuristicLab.Algorithms.LocalSearch {
|
---|
34 | /// <summary>
|
---|
35 | /// A local search improvement operator.
|
---|
36 | /// </summary>
|
---|
37 | [Item("LocalSearchImprovementOperator", "A local search improvement operator.")]
|
---|
38 | [StorableClass]
|
---|
39 | public sealed class LocalSearchImprovementOperator : SingleSuccessorOperator, ILocalImprovementOperator, IStochasticOperator {
|
---|
40 | #region IGenericLocalImprovementOperator Properties
|
---|
41 | public Type ProblemType { get { return typeof(ISingleObjectiveHeuristicOptimizationProblem); } }
|
---|
42 | public IProblem Problem {
|
---|
43 | get { return problem; }
|
---|
44 | set {
|
---|
45 | if (problem != value) {
|
---|
46 | if (value != null && !(value is ISingleObjectiveHeuristicOptimizationProblem))
|
---|
47 | throw new ArgumentException("Only problems of type " + ProblemType.ToString() + " can be assigned.");
|
---|
48 | if (problem != null) DeregisterProblemEventHandlers();
|
---|
49 | problem = (ISingleObjectiveHeuristicOptimizationProblem)value;
|
---|
50 | if (problem != null) RegisterProblemEventHandlers();
|
---|
51 | UpdateProblem();
|
---|
52 | }
|
---|
53 | }
|
---|
54 | }
|
---|
55 | #endregion
|
---|
56 |
|
---|
57 | [Storable]
|
---|
58 | private ISingleObjectiveHeuristicOptimizationProblem problem;
|
---|
59 | [Storable]
|
---|
60 | private LocalSearchMainLoop loop;
|
---|
61 | [Storable]
|
---|
62 | private BestAverageWorstQualityAnalyzer qualityAnalyzer;
|
---|
63 |
|
---|
64 | #region Parameter Properties
|
---|
65 | public ConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
|
---|
66 | get { return (ConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
|
---|
67 | }
|
---|
68 | public ConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
|
---|
69 | get { return (ConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
|
---|
70 | }
|
---|
71 | public ConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
|
---|
72 | get { return (ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
|
---|
73 | }
|
---|
74 | public IValueLookupParameter<IntValue> SampleSizeParameter {
|
---|
75 | get { return (IValueLookupParameter<IntValue>)Parameters["SampleSize"]; }
|
---|
76 | }
|
---|
77 | public ValueParameter<MultiAnalyzer> AnalyzerParameter {
|
---|
78 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
|
---|
79 | }
|
---|
80 | public ScopeTreeLookupParameter<DoubleValue> QualityParameter {
|
---|
81 | get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["Quality"]; }
|
---|
82 | }
|
---|
83 | public ILookupParameter<IRandom> RandomParameter {
|
---|
84 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
|
---|
85 | }
|
---|
86 | #region ILocalImprovementOperator Parameters
|
---|
87 | public IValueLookupParameter<IntValue> MaximumIterationsParameter {
|
---|
88 | get { return (IValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
|
---|
89 | }
|
---|
90 | public ILookupParameter<IntValue> EvaluatedSolutionsParameter {
|
---|
91 | get { return (ILookupParameter<IntValue>)Parameters["EvaluatedSolutions"]; }
|
---|
92 | }
|
---|
93 | public ILookupParameter<ResultCollection> ResultsParameter {
|
---|
94 | get { return (ILookupParameter<ResultCollection>)Parameters["Results"]; }
|
---|
95 | }
|
---|
96 | #endregion
|
---|
97 | #endregion
|
---|
98 |
|
---|
99 | #region Properties
|
---|
100 | public IMoveGenerator MoveGenerator {
|
---|
101 | get { return MoveGeneratorParameter.Value; }
|
---|
102 | set { MoveGeneratorParameter.Value = value; }
|
---|
103 | }
|
---|
104 | public IMoveMaker MoveMaker {
|
---|
105 | get { return MoveMakerParameter.Value; }
|
---|
106 | set { MoveMakerParameter.Value = value; }
|
---|
107 | }
|
---|
108 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
|
---|
109 | get { return MoveEvaluatorParameter.Value; }
|
---|
110 | set { MoveEvaluatorParameter.Value = value; }
|
---|
111 | }
|
---|
112 | public MultiAnalyzer Analyzer {
|
---|
113 | get { return AnalyzerParameter.Value; }
|
---|
114 | set { AnalyzerParameter.Value = value; }
|
---|
115 | }
|
---|
116 | #endregion
|
---|
117 |
|
---|
118 | [StorableConstructor]
|
---|
119 | private LocalSearchImprovementOperator(bool deserializing) : base(deserializing) { }
|
---|
120 | private LocalSearchImprovementOperator(LocalSearchImprovementOperator original, Cloner cloner)
|
---|
121 | : base(original, cloner) {
|
---|
122 | this.loop = cloner.Clone(original.loop);
|
---|
123 | this.qualityAnalyzer = cloner.Clone(original.qualityAnalyzer);
|
---|
124 | this.problem = cloner.Clone(original.problem);
|
---|
125 | RegisterEventHandlers();
|
---|
126 | }
|
---|
127 | public LocalSearchImprovementOperator()
|
---|
128 | : base() {
|
---|
129 | Parameters.Add(new ConstrainedValueParameter<IMoveGenerator>("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution."));
|
---|
130 | Parameters.Add(new ConstrainedValueParameter<IMoveMaker>("MoveMaker", "The operator used to perform a move."));
|
---|
131 | Parameters.Add(new ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>("MoveEvaluator", "The operator used to evaluate a move."));
|
---|
132 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(150)));
|
---|
133 | Parameters.Add(new ValueLookupParameter<IntValue>("SampleSize", "Number of moves that MultiMoveGenerators should create. This is ignored for Exhaustive- and SingleMoveGenerators.", new IntValue(300)));
|
---|
134 | Parameters.Add(new LookupParameter<IntValue>("EvaluatedSolutions", "The number of evaluated moves."));
|
---|
135 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution.", new MultiAnalyzer()));
|
---|
136 | Parameters.Add(new LookupParameter<ResultCollection>("Results", "The name of the collection where the results are stored."));
|
---|
137 | Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("Quality", "The quality/fitness value of a solution."));
|
---|
138 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
|
---|
139 |
|
---|
140 | loop = new LocalSearchMainLoop();
|
---|
141 | ParameterizeLSMainLoop();
|
---|
142 |
|
---|
143 | qualityAnalyzer = new BestAverageWorstQualityAnalyzer();
|
---|
144 | Analyzer.Operators.Add(qualityAnalyzer);
|
---|
145 |
|
---|
146 | RegisterEventHandlers();
|
---|
147 | }
|
---|
148 |
|
---|
149 | public override IDeepCloneable Clone(Cloner cloner) {
|
---|
150 | return new LocalSearchImprovementOperator(this, cloner);
|
---|
151 | }
|
---|
152 |
|
---|
153 | [StorableHook(HookType.AfterDeserialization)]
|
---|
154 | private void AfterDeserialization() {
|
---|
155 | RegisterEventHandlers();
|
---|
156 | }
|
---|
157 |
|
---|
158 | #region Event Handler Registration
|
---|
159 | private void RegisterEventHandlers() {
|
---|
160 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
|
---|
161 | if (problem != null)
|
---|
162 | RegisterProblemEventHandlers();
|
---|
163 | }
|
---|
164 |
|
---|
165 | private void RegisterProblemEventHandlers() {
|
---|
166 | problem.Reset += new EventHandler(problem_Reset);
|
---|
167 | problem.OperatorsChanged += new EventHandler(problem_OperatorsChanged);
|
---|
168 | }
|
---|
169 |
|
---|
170 | private void DeregisterProblemEventHandlers() {
|
---|
171 | problem.Reset -= new EventHandler(problem_Reset);
|
---|
172 | problem.OperatorsChanged -= new EventHandler(problem_OperatorsChanged);
|
---|
173 | }
|
---|
174 | #endregion
|
---|
175 |
|
---|
176 | #region Event Handlers
|
---|
177 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
|
---|
178 | ChooseMoveOperators();
|
---|
179 | ParameterizeLSMainLoop();
|
---|
180 | }
|
---|
181 |
|
---|
182 | private void problem_Reset(object sender, EventArgs e) {
|
---|
183 | UpdateProblem();
|
---|
184 | }
|
---|
185 |
|
---|
186 | private void problem_OperatorsChanged(object sender, EventArgs e) {
|
---|
187 | UpdateProblem();
|
---|
188 | }
|
---|
189 | #endregion
|
---|
190 |
|
---|
191 | #region Parameterize and Update Methods
|
---|
192 | private void UpdateProblem() {
|
---|
193 | UpdateMoveOperators();
|
---|
194 | ChooseMoveOperators();
|
---|
195 |
|
---|
196 | ParameterizeMoveGenerators();
|
---|
197 |
|
---|
198 | ParameterizeLSMainLoop();
|
---|
199 | ParameterizeAnalyzers();
|
---|
200 | }
|
---|
201 |
|
---|
202 | private void ParameterizeLSMainLoop() {
|
---|
203 | loop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
|
---|
204 | loop.BestLocalQualityParameter.ActualName = QualityParameter.Name;
|
---|
205 | loop.EvaluatedMovesParameter.ActualName = EvaluatedSolutionsParameter.Name;
|
---|
206 | loop.IterationsParameter.ActualName = "LocalIterations";
|
---|
207 | loop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
|
---|
208 | loop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
|
---|
209 | loop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
|
---|
210 | loop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
|
---|
211 | loop.QualityParameter.ActualName = QualityParameter.Name;
|
---|
212 | loop.RandomParameter.ActualName = RandomParameter.Name;
|
---|
213 | loop.ResultsParameter.ActualName = ResultsParameter.Name;
|
---|
214 |
|
---|
215 | if (problem != null) {
|
---|
216 | loop.BestKnownQualityParameter.ActualName = problem.BestKnownQualityParameter.Name;
|
---|
217 | loop.MaximizationParameter.ActualName = problem.MaximizationParameter.Name;
|
---|
218 | }
|
---|
219 | if (MoveEvaluator != null) {
|
---|
220 | loop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
|
---|
221 | }
|
---|
222 | }
|
---|
223 |
|
---|
224 | private void ParameterizeAnalyzers() {
|
---|
225 | qualityAnalyzer.ResultsParameter.ActualName = ResultsParameter.Name;
|
---|
226 | if (problem != null) {
|
---|
227 | qualityAnalyzer.MaximizationParameter.ActualName = problem.MaximizationParameter.Name;
|
---|
228 | if (MoveEvaluator != null)
|
---|
229 | qualityAnalyzer.QualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
|
---|
230 | qualityAnalyzer.BestKnownQualityParameter.ActualName = problem.BestKnownQualityParameter.Name;
|
---|
231 | }
|
---|
232 | }
|
---|
233 |
|
---|
234 | private void UpdateMoveOperators() {
|
---|
235 | IMoveGenerator oldMoveGenerator = MoveGenerator;
|
---|
236 | IMoveMaker oldMoveMaker = MoveMaker;
|
---|
237 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
|
---|
238 |
|
---|
239 | ClearMoveParameters();
|
---|
240 |
|
---|
241 | if (problem != null) {
|
---|
242 | foreach (IMultiMoveGenerator generator in problem.Operators.OfType<IMultiMoveGenerator>().OrderBy(x => x.Name))
|
---|
243 | MoveGeneratorParameter.ValidValues.Add(generator);
|
---|
244 | foreach (IExhaustiveMoveGenerator generator in problem.Operators.OfType<IExhaustiveMoveGenerator>().OrderBy(x => x.Name))
|
---|
245 | MoveGeneratorParameter.ValidValues.Add(generator);
|
---|
246 |
|
---|
247 | if (oldMoveGenerator != null) {
|
---|
248 | IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
|
---|
249 | if (newMoveGenerator != null) MoveGenerator = newMoveGenerator;
|
---|
250 | }
|
---|
251 |
|
---|
252 | ChooseMoveOperators(oldMoveMaker, oldMoveEvaluator);
|
---|
253 | }
|
---|
254 | }
|
---|
255 |
|
---|
256 | private void ChooseMoveOperators(IMoveMaker oldMoveMaker = null, ISingleObjectiveMoveEvaluator oldMoveEvaluator = null) {
|
---|
257 | if (oldMoveMaker == null) oldMoveMaker = MoveMaker;
|
---|
258 | if (oldMoveEvaluator == null) oldMoveEvaluator = MoveEvaluator;
|
---|
259 | MoveMakerParameter.ValidValues.Clear();
|
---|
260 | MoveEvaluatorParameter.ValidValues.Clear();
|
---|
261 |
|
---|
262 | if (MoveGenerator != null && Problem != null) {
|
---|
263 | IMoveGenerator generator = MoveGeneratorParameter.Value;
|
---|
264 | foreach (IMoveMaker moveMaker in MoveHelper.GetCompatibleMoveMakers(generator, Problem.Operators).OrderBy(x => x.Name))
|
---|
265 | MoveMakerParameter.ValidValues.Add(moveMaker);
|
---|
266 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in MoveHelper.GetCompatibleSingleObjectiveMoveEvaluators(generator, Problem.Operators).OrderBy(x => x.Name))
|
---|
267 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
|
---|
268 |
|
---|
269 | if (oldMoveMaker != null) {
|
---|
270 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
|
---|
271 | if (mm != null) MoveMaker = mm;
|
---|
272 | }
|
---|
273 | if (oldMoveEvaluator != null) {
|
---|
274 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
|
---|
275 | if (me != null) MoveEvaluator = me;
|
---|
276 | }
|
---|
277 | }
|
---|
278 | }
|
---|
279 |
|
---|
280 | private void ClearMoveParameters() {
|
---|
281 | MoveGeneratorParameter.ValidValues.Clear();
|
---|
282 | MoveMakerParameter.ValidValues.Clear();
|
---|
283 | MoveEvaluatorParameter.ValidValues.Clear();
|
---|
284 | }
|
---|
285 |
|
---|
286 | private void ParameterizeMoveGenerators() {
|
---|
287 | if (problem != null) {
|
---|
288 | foreach (IMultiMoveGenerator generator in problem.Operators.OfType<IMultiMoveGenerator>())
|
---|
289 | generator.SampleSizeParameter.ActualName = SampleSizeParameter.Name;
|
---|
290 | }
|
---|
291 | }
|
---|
292 | #endregion
|
---|
293 |
|
---|
294 | public override IOperation Apply() {
|
---|
295 | IScope currentScope = ExecutionContext.Scope;
|
---|
296 |
|
---|
297 | Scope localScope = new Scope();
|
---|
298 | Scope individual = new Scope();
|
---|
299 |
|
---|
300 | foreach (IVariable var in currentScope.Variables)
|
---|
301 | individual.Variables.Add(var); // add reference to variable otherwise the analyzer fails (it's looking down the tree)
|
---|
302 |
|
---|
303 | localScope.SubScopes.Add(individual);
|
---|
304 | currentScope.SubScopes.Add(localScope);
|
---|
305 | int index = currentScope.SubScopes.Count - 1;
|
---|
306 |
|
---|
307 | SubScopesProcessor processor = new SubScopesProcessor();
|
---|
308 | SubScopesRemover remover = new SubScopesRemover();
|
---|
309 |
|
---|
310 | remover.RemoveAllSubScopes = false;
|
---|
311 | remover.SubScopeIndexParameter.Value = new IntValue(index);
|
---|
312 |
|
---|
313 | if (index > 0) {
|
---|
314 | EmptyOperator eo = new EmptyOperator();
|
---|
315 | for (int i = 0; i < index - 1; i++) {
|
---|
316 | processor.Operators.Add(eo);
|
---|
317 | }
|
---|
318 | }
|
---|
319 |
|
---|
320 | VariableCreator variableCreator = new VariableCreator();
|
---|
321 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(loop.IterationsParameter.ActualName, new IntValue(0)));
|
---|
322 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(loop.BestLocalQualityParameter.ActualName, new DoubleValue(0)));
|
---|
323 |
|
---|
324 | variableCreator.Successor = loop;
|
---|
325 |
|
---|
326 | processor.Operators.Add(variableCreator);
|
---|
327 | processor.Successor = remover;
|
---|
328 |
|
---|
329 | OperationCollection next = new OperationCollection(base.Apply());
|
---|
330 | next.Insert(0, ExecutionContext.CreateChildOperation(processor));
|
---|
331 |
|
---|
332 | return next;
|
---|
333 | }
|
---|
334 | }
|
---|
335 | }
|
---|