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source: branches/PersistenceOverhaul/HeuristicLab.Optimization.Operators/3.3/QualitySimilarityCalculator.cs @ 14713

Last change on this file since 14713 was 14713, checked in by gkronber, 7 years ago

#2520 work in progress to support loading/saving of all samples

File size: 2.7 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 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.Data;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.Optimization.Operators {
29  /// <summary>
30  /// An item that performs similarity calculation between two solutions.
31  /// </summary>
32  /// <remarks>
33  /// The item always considers two solutions to be equal if they have the same quality.
34  /// </remarks>
35  [StorableType("64D9B8A0-D350-4B31-B56B-2EE7DAA8E970")]
36  [Item("QualitySimilarityCalculator", "An item that performs similarity calculation between two solutions. The item only considers the qualities of the two solutions.")]
37  public sealed class QualitySimilarityCalculator : SingleObjectiveSolutionSimilarityCalculator {
38    protected override bool IsCommutative { get { return true; } }
39
40    private QualitySimilarityCalculator(bool deserializing) : base(deserializing) { }
41    private QualitySimilarityCalculator(QualitySimilarityCalculator original, Cloner cloner) : base(original, cloner) { }
42    public QualitySimilarityCalculator() : base() { }
43
44    public override IDeepCloneable Clone(Cloner cloner) {
45      return new QualitySimilarityCalculator(this, cloner);
46    }
47
48    public static double CalculateSimilarity(IScope left, IScope right, string qualityVariableName) {
49      double leftQuality = ((DoubleValue)left.Variables[qualityVariableName].Value).Value;
50      double rightQuality = ((DoubleValue)right.Variables[qualityVariableName].Value).Value;
51      double delta = leftQuality.IsAlmost(rightQuality) ? 0.0 : Math.Abs(leftQuality - rightQuality);
52      return 1.0 - delta / Math.Max(leftQuality, rightQuality);
53    }
54
55    public override double CalculateSolutionSimilarity(IScope leftSolution, IScope rightSolution) {
56      return CalculateSimilarity(leftSolution, rightSolution, QualityVariableName);
57    }
58  }
59}
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