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source: trunk/sources/HeuristicLab.Problems.QuadraticAssignment/3.3/QAPSimilarityCalculator.cs @ 14185

Last change on this file since 14185 was 14185, checked in by swagner, 6 years ago

#2526: Updated year of copyrights in license headers

File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 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 HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Encodings.PermutationEncoding;
26using HeuristicLab.Optimization.Operators;
27
28namespace HeuristicLab.Problems.QuadraticAssignment {
29  /// <summary>
30  /// An operator that performs similarity calculation between two quadratic assignment solutions.
31  /// </summary>
32  /// <remarks>
33  /// The operator calculates the similarity based on the number of edges the two solutions have in common.
34  /// </remarks>
35  [Item("QAPSimilarityCalculator", "An operator that performs similarity calculation between two quadratic assignment solutions. The operator calculates the similarity based on the number of edges the two solutions have in common.")]
36  public sealed class QAPSimilarityCalculator : SingleObjectiveSolutionSimilarityCalculator {
37    protected override bool IsCommutative { get { return true; } }
38
39    private QAPSimilarityCalculator(bool deserializing) : base(deserializing) { }
40    private QAPSimilarityCalculator(QAPSimilarityCalculator original, Cloner cloner) : base(original, cloner) { }
41    public QAPSimilarityCalculator() : base() { }
42
43    public override IDeepCloneable Clone(Cloner cloner) {
44      return new QAPSimilarityCalculator(this, cloner);
45    }
46
47    public static double CalculateSimilarity(Permutation left, Permutation right) {
48      if (left == null || right == null)
49        throw new ArgumentException("Cannot calculate similarity because one of the provided solutions or both are null.");
50      if (left.Length != right.Length)
51        throw new ArgumentException("Cannot calculate similarity because the provided solutions have different lengths.");
52      if (object.ReferenceEquals(left, right)) return 1.0;
53
54      return QAPPermutationProximityCalculator.CalculateGenotypeSimilarity(left, right);
55    }
56
57    public override double CalculateSolutionSimilarity(IScope leftSolution, IScope rightSolution) {
58      var sol1 = leftSolution.Variables[SolutionVariableName].Value as Permutation;
59      var sol2 = rightSolution.Variables[SolutionVariableName].Value as Permutation;
60
61      return CalculateSimilarity(sol1, sol2);
62    }
63  }
64}
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