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source: branches/GP.Grammar.Editor/HeuristicLab.Problems.TravelingSalesman/3.3/TravelingSalesmanProblem.cs @ 6593

Last change on this file since 6593 was 6051, checked in by swagner, 14 years ago

Changed some more parameters to be hidden per default and corrected wrong layout in some parameter views (#1377)
File size: 22.8 KB
Line 
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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