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source: trunk/HeuristicLab.Encodings.ScheduleEncoding/3.3/PermutationWithRepetition/Crossovers/PWRGOXCrossover.cs @ 17180

Last change on this file since 17180 was 17180, checked in by swagner, 5 years ago

#2875: Removed years in copyrights

File size: 3.4 KB
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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 HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Encodings.IntegerVectorEncoding;
27using HEAL.Attic;
28
29namespace HeuristicLab.Encodings.ScheduleEncoding.PermutationWithRepetition {
30  [Item("PWRGeneralizationOrderCrossover", "Represents a crossover operation swapping sequences of the parents to generate offspring.")]
31  [StorableType("DB974328-5DB4-4B9A-8223-924E929C573B")]
32  public class PWRGOXCrossover : PWRCrossover {
33
34    [StorableConstructor]
35    protected PWRGOXCrossover(StorableConstructorFlag _) : base(_) { }
36    protected PWRGOXCrossover(PWRGOXCrossover original, Cloner cloner) : base(original, cloner) { }
37    public PWRGOXCrossover() : base() { }
38
39    public override IDeepCloneable Clone(Cloner cloner) {
40      return new PWRGOXCrossover(this, cloner);
41    }
42
43    private static int[] GetLookUpForIndividual(List<int> p) {
44      var result = new int[p.Count];
45      var lookUpTable = new Dictionary<int, int>();
46
47      for (int i = 0; i < p.Count; i++) {
48        if (!lookUpTable.ContainsKey(p[i]))
49          lookUpTable.Add(p[i], 0);
50        result[i] = lookUpTable[p[i]];
51        lookUpTable[p[i]]++;
52      }
53
54      return result;
55    }
56
57    public static PWREncoding Apply(IRandom random, PWREncoding parent1, PWREncoding parent2) {
58      var result = new PWREncoding();
59
60      var p1 = ((IntegerVector)(parent1.PermutationWithRepetition.Clone())).ToList();
61      var p2 = ((IntegerVector)(parent2.PermutationWithRepetition.Clone())).ToList();
62      var child = new List<int>();
63
64      int[] lookUpArrayP1 = GetLookUpForIndividual(p1);
65      int[] lookUpArrayP2 = GetLookUpForIndividual(p2);
66
67      int xStringLength = p1.Count / 2;
68      int xStringPosition = random.Next(p1.Count / 2);
69
70      //insert elements from parent1 that dont conflict with the "selected" elements form parent2
71      for (int i = 0; i < p1.Count; i++) {
72        bool isSelected = false;
73        for (int j = xStringPosition; j < xStringPosition + xStringLength; j++) {
74          if (p1[i] == p2[j] && lookUpArrayP1[i] == lookUpArrayP2[j])
75            isSelected = true;
76        }
77        if (!isSelected)
78          child.Add(p1[i]);
79      }
80
81      for (int i = xStringPosition; i < xStringPosition + xStringLength; i++) {
82        child.Insert(i, p2[i]);
83      }
84
85      result.PermutationWithRepetition = new IntegerVector(child.ToArray());
86      return result;
87    }
88
89    public override PWREncoding Cross(IRandom random, PWREncoding parent1, PWREncoding parent2) {
90      return Apply(random, parent1, parent2);
91    }
92
93  }
94}
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