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source: branches/histogram/HeuristicLab.Problems.TravelingSalesman/3.3/TravelingSalesmanProblem.cs @ 6055

Last change on this file since 6055 was 6055, checked in by abeham, 13 years ago

#1465

  • updated branch from trunk
File size: 22.8 KB
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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 System;
23using System.Collections.Generic;
24using System.Drawing;
25using System.IO;
26using System.Linq;
27using HeuristicLab.Common;
28using HeuristicLab.Core;
29using HeuristicLab.Data;
30using HeuristicLab.Encodings.PermutationEncoding;
31using HeuristicLab.Optimization;
32using HeuristicLab.Parameters;
33using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
34using HeuristicLab.PluginInfrastructure;
35
36namespace HeuristicLab.Problems.TravelingSalesman {
37  [Item("Traveling Salesman Problem", "Represents a symmetric Traveling Salesman Problem.")]
38  [Creatable("Problems")]
39  [StorableClass]
40  public sealed class TravelingSalesmanProblem : ParameterizedNamedItem, ISingleObjectiveHeuristicOptimizationProblem, IStorableContent {
41    public string Filename { get; set; }
42
43    public override Image ItemImage {
44      get { return HeuristicLab.Common.Resources.VSImageLibrary.Type; }
45    }
46
47    #region Parameter Properties
48    public ValueParameter<BoolValue> MaximizationParameter {
49      get { return (ValueParameter<BoolValue>)Parameters["Maximization"]; }
50    }
51    IParameter ISingleObjectiveHeuristicOptimizationProblem.MaximizationParameter {
52      get { return MaximizationParameter; }
53    }
54    public ValueParameter<DoubleMatrix> CoordinatesParameter {
55      get { return (ValueParameter<DoubleMatrix>)Parameters["Coordinates"]; }
56    }
57    public OptionalValueParameter<DistanceMatrix> DistanceMatrixParameter {
58      get { return (OptionalValueParameter<DistanceMatrix>)Parameters["DistanceMatrix"]; }
59    }
60    public ValueParameter<BoolValue> UseDistanceMatrixParameter {
61      get { return (ValueParameter<BoolValue>)Parameters["UseDistanceMatrix"]; }
62    }
63    public ValueParameter<IPermutationCreator> SolutionCreatorParameter {
64      get { return (ValueParameter<IPermutationCreator>)Parameters["SolutionCreator"]; }
65    }
66    IParameter IHeuristicOptimizationProblem.SolutionCreatorParameter {
67      get { return SolutionCreatorParameter; }
68    }
69    public ValueParameter<ITSPEvaluator> EvaluatorParameter {
70      get { return (ValueParameter<ITSPEvaluator>)Parameters["Evaluator"]; }
71    }
72    IParameter IHeuristicOptimizationProblem.EvaluatorParameter {
73      get { return EvaluatorParameter; }
74    }
75    public OptionalValueParameter<DoubleValue> BestKnownQualityParameter {
76      get { return (OptionalValueParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
77    }
78    IParameter ISingleObjectiveHeuristicOptimizationProblem.BestKnownQualityParameter {
79      get { return BestKnownQualityParameter; }
80    }
81    public OptionalValueParameter<Permutation> BestKnownSolutionParameter {
82      get { return (OptionalValueParameter<Permutation>)Parameters["BestKnownSolution"]; }
83    }
84    #endregion
85
86    #region Properties
87    public DoubleMatrix Coordinates {
88      get { return CoordinatesParameter.Value; }
89      set { CoordinatesParameter.Value = value; }
90    }
91    public DistanceMatrix DistanceMatrix {
92      get { return DistanceMatrixParameter.Value; }
93      set { DistanceMatrixParameter.Value = value; }
94    }
95    public BoolValue UseDistanceMatrix {
96      get { return UseDistanceMatrixParameter.Value; }
97      set { UseDistanceMatrixParameter.Value = value; }
98    }
99    public IPermutationCreator SolutionCreator {
100      get { return SolutionCreatorParameter.Value; }
101      set { SolutionCreatorParameter.Value = value; }
102    }
103    ISolutionCreator IHeuristicOptimizationProblem.SolutionCreator {
104      get { return SolutionCreatorParameter.Value; }
105    }
106    public ITSPEvaluator Evaluator {
107      get { return EvaluatorParameter.Value; }
108      set { EvaluatorParameter.Value = value; }
109    }
110    ISingleObjectiveEvaluator ISingleObjectiveHeuristicOptimizationProblem.Evaluator {
111      get { return EvaluatorParameter.Value; }
112    }
113    IEvaluator IHeuristicOptimizationProblem.Evaluator {
114      get { return EvaluatorParameter.Value; }
115    }
116    public DoubleValue BestKnownQuality {
117      get { return BestKnownQualityParameter.Value; }
118      set { BestKnownQualityParameter.Value = value; }
119    }
120    public Permutation BestKnownSolution {
121      get { return BestKnownSolutionParameter.Value; }
122      set { BestKnownSolutionParameter.Value = value; }
123    }
124    public IEnumerable<IOperator> Operators {
125      get { return operators; }
126    }
127    private BestTSPSolutionAnalyzer BestTSPSolutionAnalyzer {
128      get { return operators.OfType<BestTSPSolutionAnalyzer>().FirstOrDefault(); }
129    }
130    private TSPAlleleFrequencyAnalyzer TSPAlleleFrequencyAnalyzer {
131      get { return operators.OfType<TSPAlleleFrequencyAnalyzer>().FirstOrDefault(); }
132    }
133    private TSPPopulationDiversityAnalyzer TSPPopulationDiversityAnalyzer {
134      get { return operators.OfType<TSPPopulationDiversityAnalyzer>().FirstOrDefault(); }
135    }
136    #endregion
137
138    [Storable]
139    private List<IOperator> operators;
140
141    [StorableConstructor]
142    private TravelingSalesmanProblem(bool deserializing) : base(deserializing) { }
143    private TravelingSalesmanProblem(TravelingSalesmanProblem original, Cloner cloner)
144      : base(original, cloner) {
145      this.operators = original.operators.Select(x => (IOperator)cloner.Clone(x)).ToList();
146      AttachEventHandlers();
147    }
148    public override IDeepCloneable Clone(Cloner cloner) {
149      return new TravelingSalesmanProblem(this, cloner);
150    }
151    public TravelingSalesmanProblem()
152      : base() {
153      RandomPermutationCreator creator = new RandomPermutationCreator();
154      TSPRoundedEuclideanPathEvaluator evaluator = new TSPRoundedEuclideanPathEvaluator();
155
156      Parameters.Add(new ValueParameter<BoolValue>("Maximization", "Set to false as the Traveling Salesman Problem is a minimization problem.", new BoolValue(false)));
157      Parameters.Add(new ValueParameter<DoubleMatrix>("Coordinates", "The x- and y-Coordinates of the cities."));
158      Parameters.Add(new OptionalValueParameter<DistanceMatrix>("DistanceMatrix", "The matrix which contains the distances between the cities."));
159      Parameters.Add(new ValueParameter<BoolValue>("UseDistanceMatrix", "True if a distance matrix should be calculated and used for evaluation, otherwise false.", new BoolValue(true)));
160      Parameters.Add(new ValueParameter<IPermutationCreator>("SolutionCreator", "The operator which should be used to create new TSP solutions.", creator));
161      Parameters.Add(new ValueParameter<ITSPEvaluator>("Evaluator", "The operator which should be used to evaluate TSP solutions.", evaluator));
162      Parameters.Add(new OptionalValueParameter<DoubleValue>("BestKnownQuality", "The quality of the best known solution of this TSP instance."));
163      Parameters.Add(new OptionalValueParameter<Permutation>("BestKnownSolution", "The best known solution of this TSP instance."));
164
165      MaximizationParameter.Hidden = true;
166      DistanceMatrixParameter.ReactOnValueToStringChangedAndValueItemImageChanged = false;
167
168      Coordinates = new DoubleMatrix(new double[,] {
169        { 100, 100 }, { 100, 200 }, { 100, 300 }, { 100, 400 },
170        { 200, 100 }, { 200, 200 }, { 200, 300 }, { 200, 400 },
171        { 300, 100 }, { 300, 200 }, { 300, 300 }, { 300, 400 },
172        { 400, 100 }, { 400, 200 }, { 400, 300 }, { 400, 400 }
173      });
174
175      creator.PermutationParameter.ActualName = "TSPTour";
176      evaluator.QualityParameter.ActualName = "TSPTourLength";
177      ParameterizeSolutionCreator();
178      ParameterizeEvaluator();
179
180      InitializeOperators();
181      AttachEventHandlers();
182    }
183
184    #region Events
185    public event EventHandler SolutionCreatorChanged;
186    private void OnSolutionCreatorChanged() {
187      EventHandler handler = SolutionCreatorChanged;
188      if (handler != null) handler(this, EventArgs.Empty);
189    }
190    public event EventHandler EvaluatorChanged;
191    private void OnEvaluatorChanged() {
192      EventHandler handler = EvaluatorChanged;
193      if (handler != null) handler(this, EventArgs.Empty);
194    }
195    public event EventHandler OperatorsChanged;
196    private void OnOperatorsChanged() {
197      EventHandler handler = OperatorsChanged;
198      if (handler != null) handler(this, EventArgs.Empty);
199    }
200    public event EventHandler Reset;
201    private void OnReset() {
202      EventHandler handler = Reset;
203      if (handler != null) handler(this, EventArgs.Empty);
204    }
205
206    private void CoordinatesParameter_ValueChanged(object sender, EventArgs e) {
207      Coordinates.ItemChanged += new EventHandler<EventArgs<int, int>>(Coordinates_ItemChanged);
208      Coordinates.Reset += new EventHandler(Coordinates_Reset);
209      ParameterizeSolutionCreator();
210      ClearDistanceMatrix();
211    }
212    private void Coordinates_ItemChanged(object sender, EventArgs<int, int> e) {
213      ClearDistanceMatrix();
214    }
215    private void Coordinates_Reset(object sender, EventArgs e) {
216      ParameterizeSolutionCreator();
217      ClearDistanceMatrix();
218    }
219    private void SolutionCreatorParameter_ValueChanged(object sender, EventArgs e) {
220      SolutionCreator.PermutationParameter.ActualNameChanged += new EventHandler(SolutionCreator_PermutationParameter_ActualNameChanged);
221      ParameterizeSolutionCreator();
222      ParameterizeEvaluator();
223      ParameterizeAnalyzers();
224      ParameterizeOperators();
225      OnSolutionCreatorChanged();
226    }
227    private void SolutionCreator_PermutationParameter_ActualNameChanged(object sender, EventArgs e) {
228      ParameterizeEvaluator();
229      ParameterizeAnalyzers();
230      ParameterizeOperators();
231    }
232    private void EvaluatorParameter_ValueChanged(object sender, EventArgs e) {
233      Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
234      ParameterizeEvaluator();
235      UpdateMoveEvaluators();
236      ParameterizeAnalyzers();
237      ClearDistanceMatrix();
238      OnEvaluatorChanged();
239    }
240    private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
241      ParameterizeAnalyzers();
242    }
243    private void MoveGenerator_InversionMoveParameter_ActualNameChanged(object sender, EventArgs e) {
244      string name = ((ILookupParameter<InversionMove>)sender).ActualName;
245      foreach (IPermutationInversionMoveOperator op in Operators.OfType<IPermutationInversionMoveOperator>()) {
246        op.InversionMoveParameter.ActualName = name;
247      }
248    }
249    private void MoveGenerator_TranslocationMoveParameter_ActualNameChanged(object sender, EventArgs e) {
250      string name = ((ILookupParameter<TranslocationMove>)sender).ActualName;
251      foreach (IPermutationTranslocationMoveOperator op in Operators.OfType<IPermutationTranslocationMoveOperator>()) {
252        op.TranslocationMoveParameter.ActualName = name;
253      }
254    }
255    #endregion
256
257    #region Helpers
258    [StorableHook(HookType.AfterDeserialization)]
259    private void AfterDeserialization() {
260      // BackwardsCompatibility3.3
261      #region Backwards compatible code (remove with 3.4)
262      OptionalValueParameter<DoubleMatrix> oldDistanceMatrixParameter = Parameters["DistanceMatrix"] as OptionalValueParameter<DoubleMatrix>;
263      if (oldDistanceMatrixParameter != null) {
264        Parameters.Remove(oldDistanceMatrixParameter);
265        Parameters.Add(new OptionalValueParameter<DistanceMatrix>("DistanceMatrix", "The matrix which contains the distances between the cities."));
266        DistanceMatrixParameter.GetsCollected = oldDistanceMatrixParameter.GetsCollected;
267        DistanceMatrixParameter.ReactOnValueToStringChangedAndValueItemImageChanged = false;
268        if (oldDistanceMatrixParameter.Value != null) {
269          DoubleMatrix oldDM = oldDistanceMatrixParameter.Value;
270          DistanceMatrix newDM = new DistanceMatrix(oldDM.Rows, oldDM.Columns, oldDM.ColumnNames, oldDM.RowNames);
271          newDM.SortableView = oldDM.SortableView;
272          for (int i = 0; i < newDM.Rows; i++)
273            for (int j = 0; j < newDM.Columns; j++)
274              newDM[i, j] = oldDM[i, j];
275          DistanceMatrixParameter.Value = (DistanceMatrix)newDM.AsReadOnly();
276        }
277      }
278
279      if (operators == null) InitializeOperators();
280      #endregion
281      AttachEventHandlers();
282    }
283
284    private void AttachEventHandlers() {
285      CoordinatesParameter.ValueChanged += new EventHandler(CoordinatesParameter_ValueChanged);
286      Coordinates.ItemChanged += new EventHandler<EventArgs<int, int>>(Coordinates_ItemChanged);
287      Coordinates.Reset += new EventHandler(Coordinates_Reset);
288      SolutionCreatorParameter.ValueChanged += new EventHandler(SolutionCreatorParameter_ValueChanged);
289      SolutionCreator.PermutationParameter.ActualNameChanged += new EventHandler(SolutionCreator_PermutationParameter_ActualNameChanged);
290      EvaluatorParameter.ValueChanged += new EventHandler(EvaluatorParameter_ValueChanged);
291      Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
292    }
293
294    private void InitializeOperators() {
295      operators = new List<IOperator>();
296      operators.Add(new BestTSPSolutionAnalyzer());
297      operators.Add(new TSPAlleleFrequencyAnalyzer());
298      operators.Add(new TSPPopulationDiversityAnalyzer());
299      ParameterizeAnalyzers();
300      operators.AddRange(ApplicationManager.Manager.GetInstances<IPermutationOperator>().Cast<IOperator>());
301      ParameterizeOperators();
302      UpdateMoveEvaluators();
303      InitializeMoveGenerators();
304    }
305    private void InitializeMoveGenerators() {
306      foreach (IPermutationInversionMoveOperator op in Operators.OfType<IPermutationInversionMoveOperator>()) {
307        if (op is IMoveGenerator) {
308          op.InversionMoveParameter.ActualNameChanged += new EventHandler(MoveGenerator_InversionMoveParameter_ActualNameChanged);
309        }
310      }
311      foreach (IPermutationTranslocationMoveOperator op in Operators.OfType<IPermutationTranslocationMoveOperator>()) {
312        if (op is IMoveGenerator) {
313          op.TranslocationMoveParameter.ActualNameChanged += new EventHandler(MoveGenerator_TranslocationMoveParameter_ActualNameChanged);
314        }
315      }
316    }
317    private void UpdateMoveEvaluators() {
318      operators.RemoveAll(x => x is ISingleObjectiveMoveEvaluator);
319      foreach (ITSPPathMoveEvaluator op in ApplicationManager.Manager.GetInstances<ITSPPathMoveEvaluator>())
320        if (op.EvaluatorType == Evaluator.GetType()) {
321          operators.Add(op);
322        }
323      ParameterizeOperators();
324      OnOperatorsChanged();
325    }
326    private void ParameterizeSolutionCreator() {
327      SolutionCreator.LengthParameter.Value = new IntValue(Coordinates.Rows);
328      SolutionCreator.LengthParameter.Hidden = true;
329      SolutionCreator.PermutationTypeParameter.Value = new PermutationType(PermutationTypes.RelativeUndirected);
330      SolutionCreator.PermutationTypeParameter.Hidden = true;
331    }
332    private void ParameterizeEvaluator() {
333      if (Evaluator is ITSPPathEvaluator) {
334        ITSPPathEvaluator evaluator = (ITSPPathEvaluator)Evaluator;
335        evaluator.PermutationParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
336        evaluator.PermutationParameter.Hidden = true;
337      }
338      if (Evaluator is ITSPCoordinatesPathEvaluator) {
339        ITSPCoordinatesPathEvaluator evaluator = (ITSPCoordinatesPathEvaluator)Evaluator;
340        evaluator.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
341        evaluator.CoordinatesParameter.Hidden = true;
342        evaluator.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
343        evaluator.DistanceMatrixParameter.Hidden = true;
344        evaluator.UseDistanceMatrixParameter.ActualName = UseDistanceMatrixParameter.Name;
345        evaluator.UseDistanceMatrixParameter.Hidden = true;
346      }
347    }
348    private void ParameterizeAnalyzers() {
349      if (BestTSPSolutionAnalyzer != null) {
350        BestTSPSolutionAnalyzer.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
351        BestTSPSolutionAnalyzer.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
352        BestTSPSolutionAnalyzer.PermutationParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
353        BestTSPSolutionAnalyzer.ResultsParameter.ActualName = "Results";
354        BestTSPSolutionAnalyzer.BestKnownQualityParameter.ActualName = BestKnownQualityParameter.Name;
355        BestTSPSolutionAnalyzer.BestKnownSolutionParameter.ActualName = BestKnownSolutionParameter.Name;
356        BestTSPSolutionAnalyzer.MaximizationParameter.ActualName = MaximizationParameter.Name;
357      }
358
359      if (TSPAlleleFrequencyAnalyzer != null) {
360        TSPAlleleFrequencyAnalyzer.MaximizationParameter.ActualName = MaximizationParameter.Name;
361        TSPAlleleFrequencyAnalyzer.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
362        TSPAlleleFrequencyAnalyzer.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
363        TSPAlleleFrequencyAnalyzer.SolutionParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
364        TSPAlleleFrequencyAnalyzer.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
365        TSPAlleleFrequencyAnalyzer.BestKnownSolutionParameter.ActualName = BestKnownSolutionParameter.Name;
366        TSPAlleleFrequencyAnalyzer.ResultsParameter.ActualName = "Results";
367      }
368
369      if (TSPPopulationDiversityAnalyzer != null) {
370        TSPPopulationDiversityAnalyzer.MaximizationParameter.ActualName = MaximizationParameter.Name;
371        TSPPopulationDiversityAnalyzer.SolutionParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
372        TSPPopulationDiversityAnalyzer.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
373        TSPPopulationDiversityAnalyzer.ResultsParameter.ActualName = "Results";
374      }
375    }
376    private void ParameterizeOperators() {
377      foreach (IPermutationCrossover op in Operators.OfType<IPermutationCrossover>()) {
378        op.ParentsParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
379        op.ParentsParameter.Hidden = true;
380        op.ChildParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
381        op.ChildParameter.Hidden = true;
382      }
383      foreach (IPermutationManipulator op in Operators.OfType<IPermutationManipulator>()) {
384        op.PermutationParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
385        op.PermutationParameter.Hidden = true;
386      }
387      foreach (IPermutationMoveOperator op in Operators.OfType<IPermutationMoveOperator>()) {
388        op.PermutationParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
389        op.PermutationParameter.Hidden = true;
390      }
391      foreach (ITSPPathMoveEvaluator op in Operators.OfType<ITSPPathMoveEvaluator>()) {
392        op.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
393        op.CoordinatesParameter.Hidden = true;
394        op.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
395        op.DistanceMatrixParameter.Hidden = true;
396        op.UseDistanceMatrixParameter.ActualName = UseDistanceMatrixParameter.Name;
397        op.UseDistanceMatrixParameter.Hidden = true;
398        op.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
399        op.QualityParameter.Hidden = true;
400        op.PermutationParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
401        op.PermutationParameter.Hidden = true;
402      }
403      string inversionMove = Operators.OfType<IMoveGenerator>().OfType<IPermutationInversionMoveOperator>().First().InversionMoveParameter.ActualName;
404      foreach (IPermutationInversionMoveOperator op in Operators.OfType<IPermutationInversionMoveOperator>()) {
405        op.InversionMoveParameter.ActualName = inversionMove;
406        op.InversionMoveParameter.Hidden = true;
407      }
408      string translocationMove = Operators.OfType<IMoveGenerator>().OfType<IPermutationTranslocationMoveOperator>().First().TranslocationMoveParameter.ActualName;
409      foreach (IPermutationTranslocationMoveOperator op in Operators.OfType<IPermutationTranslocationMoveOperator>()) {
410        op.TranslocationMoveParameter.ActualName = translocationMove;
411        op.TranslocationMoveParameter.Hidden = true;
412      }
413      foreach (IPermutationMultiNeighborhoodShakingOperator op in Operators.OfType<IPermutationMultiNeighborhoodShakingOperator>()) {
414        op.PermutationParameter.ActualName = SolutionCreator.PermutationParameter.ActualName;
415        op.PermutationParameter.Hidden = true;
416      }
417    }
418
419    private void ClearDistanceMatrix() {
420      DistanceMatrixParameter.Value = null;
421    }
422    #endregion
423
424    public void ImportFromTSPLIB(string tspFileName, string optimalTourFileName) {
425      TSPLIBParser tspParser = new TSPLIBParser(tspFileName);
426      tspParser.Parse();
427      Name = tspParser.Name + " TSP (imported from TSPLIB)";
428      if (!string.IsNullOrEmpty(tspParser.Comment)) Description = tspParser.Comment;
429      Coordinates = new DoubleMatrix(tspParser.Vertices);
430      if (tspParser.WeightType == TSPLIBParser.TSPLIBEdgeWeightType.EUC_2D) {
431        TSPRoundedEuclideanPathEvaluator evaluator = new TSPRoundedEuclideanPathEvaluator();
432        evaluator.QualityParameter.ActualName = "TSPTourLength";
433        Evaluator = evaluator;
434      } else if (tspParser.WeightType == TSPLIBParser.TSPLIBEdgeWeightType.GEO) {
435        TSPGeoPathEvaluator evaluator = new TSPGeoPathEvaluator();
436        evaluator.QualityParameter.ActualName = "TSPTourLength";
437        Evaluator = evaluator;
438      }
439      BestKnownQuality = null;
440      BestKnownSolution = null;
441
442      if (!string.IsNullOrEmpty(optimalTourFileName)) {
443        TSPLIBTourParser tourParser = new TSPLIBTourParser(optimalTourFileName);
444        tourParser.Parse();
445        if (tourParser.Tour.Length != Coordinates.Rows) throw new InvalidDataException("Length of optimal tour is not equal to number of cities.");
446        BestKnownSolution = new Permutation(PermutationTypes.RelativeUndirected, tourParser.Tour);
447      }
448      OnReset();
449    }
450    public void ImportFromTSPLIB(string tspFileName, string optimalTourFileName, double bestKnownQuality) {
451      ImportFromTSPLIB(tspFileName, optimalTourFileName);
452      BestKnownQuality = new DoubleValue(bestKnownQuality);
453    }
454  }
455}
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