source: branches/ScatterSearch (trunk integration)/HeuristicLab.Problems.Knapsack/3.3/SimilarityCalculators/KnapsackSimilarityCalculator.cs @ 8303

Last change on this file since 8303 was 8303, checked in by jkarder, 7 years ago

#1331: made similarity calculators storable and cloneable

File size: 2.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 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.BinaryVectorEncoding;
26using HeuristicLab.Optimization.Operators;
27
28namespace HeuristicLab.Problems.Knapsack {
29  /// <summary>
30  /// An operator that performs similarity calculation between two knapsack solutions.
31  /// </summary>
32  [Item("KnapsackSimilarityCalculator", "An operator that performs similarity calculation between two knapsack solutions.")]
33  public sealed class KnapsackSimilarityCalculator : SimilarityCalculator {
34    private KnapsackSimilarityCalculator(bool deserializing) : base(deserializing) { }
35    private KnapsackSimilarityCalculator(KnapsackSimilarityCalculator original, Cloner cloner) : base(original, cloner) { }
36    public KnapsackSimilarityCalculator() : base() { }
37
38    public override IDeepCloneable Clone(Cloner cloner) {
39      return new KnapsackSimilarityCalculator(this, cloner);
40    }
41
42    public static double CalculateSimilarity(BinaryVector left, BinaryVector right) {
43      if (left == null || right == null)
44        throw new ArgumentException("Cannot calculate similarity because one of the provided solutions or both are null.");
45
46      double similarity = 0.0;
47      for (int i = 0; i < left.Length; i++)
48        if (left[i] == right[i]) similarity++;
49      return similarity / left.Length;
50    }
51
52    protected override double CalculateSimilarity(IScope left, IScope right) {
53      BinaryVector sol1 = left.Variables[Target].Value as BinaryVector;
54      BinaryVector sol2 = right.Variables[Target].Value as BinaryVector;
55
56      return CalculateSimilarity(sol1, sol2);
57    }
58  }
59}
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