source: branches/2520_PersistenceReintegration/HeuristicLab.Encodings.PermutationEncoding/3.3/Moves/TwoOpt/StochasticInversionSingleMoveGenerator.cs @ 16453

Last change on this file since 16453 was 16453, checked in by jkarder, 10 months ago

#2520: updated year of copyrights

File size: 3.0 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 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.Optimization;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Encodings.PermutationEncoding {
30  [Item("StochasticInversionSingleMoveGenerator", "Randomly samples a single from all possible inversion moves (2-opt) from a given permutation.")]
31  [StorableClass]
32  public class StochasticInversionSingleMoveGenerator : InversionMoveGenerator, IStochasticOperator, ISingleMoveGenerator {
33    public ILookupParameter<IRandom> RandomParameter {
34      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
35    }
36
37    [StorableConstructor]
38    protected StochasticInversionSingleMoveGenerator(bool deserializing) : base(deserializing) { }
39    protected StochasticInversionSingleMoveGenerator(StochasticInversionSingleMoveGenerator original, Cloner cloner) : base(original, cloner) { }
40    public StochasticInversionSingleMoveGenerator()
41      : base() {
42      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
43    }
44
45    public override IDeepCloneable Clone(Cloner cloner) {
46      return new StochasticInversionSingleMoveGenerator(this, cloner);
47    }
48
49    public static InversionMove Apply(Permutation permutation, IRandom random) {
50      int length = permutation.Length;
51      if (length == 1) throw new ArgumentException("StochasticInversionSingleMoveGenerator: There cannot be an inversion move given a permutation of length 1.", "permutation");
52      int index1 = random.Next(length - 1);
53      int index2 = random.Next(index1 + 1, length);
54      if (permutation.PermutationType == PermutationTypes.RelativeUndirected) {
55        if (length > 3) {
56          while (index2 - index1 >= length - 2)
57            index2 = random.Next(index1 + 1, length);
58        }
59      }
60      return new InversionMove(index1, index2);
61    }
62
63    protected override InversionMove[] GenerateMoves(Permutation permutation) {
64      IRandom random = RandomParameter.ActualValue;
65      return new InversionMove[] { Apply(permutation, random) };
66    }
67  }
68}
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