1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using HeuristicLab.Common;
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24 | using HeuristicLab.Core;
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25 | using HeuristicLab.Data;
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26 | using HeuristicLab.Persistence;
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27 |
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28 | namespace HeuristicLab.Optimization.Operators {
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29 | /// <summary>
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30 | /// An item that performs similarity calculation between two solutions.
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31 | /// </summary>
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32 | /// <remarks>
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33 | /// The item always considers two solutions to be equal if they have the same quality.
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34 | /// </remarks>
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35 | [Item("QualitySimilarityCalculator", "An item that performs similarity calculation between two solutions. The item only considers the qualities of the two solutions.")]
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36 | [StorableType("3f538105-c336-47c5-9b00-89b988d63acc")]
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37 | public sealed class QualitySimilarityCalculator : SingleObjectiveSolutionSimilarityCalculator {
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38 | protected override bool IsCommutative { get { return true; } }
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39 |
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40 | private QualitySimilarityCalculator(StorableConstructorFlag deserializing) : base(deserializing) { }
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41 | private QualitySimilarityCalculator(QualitySimilarityCalculator original, Cloner cloner) : base(original, cloner) { }
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42 | public QualitySimilarityCalculator() : base() { }
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43 |
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44 | public override IDeepCloneable Clone(Cloner cloner) {
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45 | return new QualitySimilarityCalculator(this, cloner);
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46 | }
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47 |
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48 | public static double CalculateSimilarity(IScope left, IScope right, string qualityVariableName) {
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49 | double leftQuality = ((DoubleValue)left.Variables[qualityVariableName].Value).Value;
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50 | double rightQuality = ((DoubleValue)right.Variables[qualityVariableName].Value).Value;
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51 | double delta = leftQuality.IsAlmost(rightQuality) ? 0.0 : Math.Abs(leftQuality - rightQuality);
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52 | return 1.0 - delta / Math.Max(leftQuality, rightQuality);
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53 | }
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54 |
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55 | public override double CalculateSolutionSimilarity(IScope leftSolution, IScope rightSolution) {
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56 | return CalculateSimilarity(leftSolution, rightSolution, QualityVariableName);
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57 | }
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58 | }
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59 | } |
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