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source: branches/2521_ProblemRefactoring/HeuristicLab.Algorithms.MOCMAEvolutionStrategy/3.3/Indicators/HypervolumeIndicator.cs @ 17309

Last change on this file since 17309 was 17309, checked in by abeham, 4 years ago

#2521: Refactored maximization property for multi-objective problems

File size: 2.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 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.Collections.Generic;
23using System.Linq;
24using HEAL.Attic;
25using HeuristicLab.Common;
26using HeuristicLab.Core;
27using HeuristicLab.Optimization;
28
29namespace HeuristicLab.Algorithms.MOCMAEvolutionStrategy {
30  [Item("HypervolumeIndicator", "Selection of offspring based on contributing Hypervolume")]
31  [StorableType("ADF439D6-64E4-4C92-A4D3-E8C05B050406")]
32  internal class HypervolumeIndicator : Item, IIndicator {
33    #region Constructors and Cloning
34    [StorableConstructor]
35    protected HypervolumeIndicator(StorableConstructorFlag _) : base(_) { }
36    protected HypervolumeIndicator(HypervolumeIndicator original, Cloner cloner) : base(original, cloner) { }
37    public override IDeepCloneable Clone(Cloner cloner) {
38      return new HypervolumeIndicator(this, cloner);
39    }
40    public HypervolumeIndicator() { }
41    #endregion
42
43    public int LeastContributer(IReadOnlyList<Individual> front, IMultiObjectiveProblemDefinition problem) {
44      var frontCopy = front.Select(x => x.PenalizedFitness).ToList();
45      if (frontCopy.Count <= 1) return 0;
46      //TODO discuss with bwerth
47      var tep = problem != null ? frontCopy.Concat(new[] {problem.ReferencePoint}) : frontCopy;
48      var refPoint = HypervolumeCalculator.CalculateNadirPoint(tep, problem.Maximization);
49      var contributions = Enumerable.Range(0, frontCopy.Count).Select(i => Contribution(frontCopy, i, problem.Maximization, refPoint));
50      return contributions.Select((value, index) => new {value, index}).OrderBy(x => x.value).First().index;
51    }
52
53    #region Helpers
54    private static double Contribution(IList<double[]> front, int idx, IReadOnlyList<bool> maximization, double[] refPoint) {
55      var point = front[idx];
56      front.RemoveAt(idx);
57      var contribution = -HypervolumeCalculator.CalculateHypervolume(front.ToArray(), refPoint, maximization);
58      front.Insert(idx, point);
59      return contribution;
60    }
61    #endregion
62  }
63}
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