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source: trunk/HeuristicLab.Encodings.PermutationEncoding/3.3/Moves/TwoOpt/StochasticInversionSingleMoveGenerator.cs @ 16724

Last change on this file since 16724 was 16565, checked in by gkronber, 6 years ago

#2520: merged changes from PersistenceOverhaul branch (r16451:16564) into trunk

File size: 3.0 KB
RevLine 
[3098]1#region License Information
2/* HeuristicLab
[16565]3 * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
[3098]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;
[4722]23using HeuristicLab.Common;
[3098]24using HeuristicLab.Core;
25using HeuristicLab.Optimization;
26using HeuristicLab.Parameters;
[16565]27using HEAL.Attic;
[3098]28
29namespace HeuristicLab.Encodings.PermutationEncoding {
[3232]30  [Item("StochasticInversionSingleMoveGenerator", "Randomly samples a single from all possible inversion moves (2-opt) from a given permutation.")]
[16565]31  [StorableType("F7190264-4BE1-45A2-A908-E2C7869B4F1F")]
[3232]32  public class StochasticInversionSingleMoveGenerator : InversionMoveGenerator, IStochasticOperator, ISingleMoveGenerator {
[3098]33    public ILookupParameter<IRandom> RandomParameter {
34      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
35    }
36
[4722]37    [StorableConstructor]
[16565]38    protected StochasticInversionSingleMoveGenerator(StorableConstructorFlag _) : base(_) { }
[4722]39    protected StochasticInversionSingleMoveGenerator(StochasticInversionSingleMoveGenerator original, Cloner cloner) : base(original, cloner) { }
[3232]40    public StochasticInversionSingleMoveGenerator()
[3098]41      : base() {
42      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
43    }
44
[4722]45    public override IDeepCloneable Clone(Cloner cloner) {
46      return new StochasticInversionSingleMoveGenerator(this, cloner);
47    }
48
[3232]49    public static InversionMove Apply(Permutation permutation, IRandom random) {
[3098]50      int length = permutation.Length;
[3706]51      if (length == 1) throw new ArgumentException("StochasticInversionSingleMoveGenerator: There cannot be an inversion move given a permutation of length 1.", "permutation");
[3221]52      int index1 = random.Next(length - 1);
53      int index2 = random.Next(index1 + 1, length);
[3233]54      if (permutation.PermutationType == PermutationTypes.RelativeUndirected) {
[3706]55        if (length > 3) {
56          while (index2 - index1 >= length - 2)
57            index2 = random.Next(index1 + 1, length);
58        }
[3233]59      }
60      return new InversionMove(index1, index2);
[3098]61    }
62
[3232]63    protected override InversionMove[] GenerateMoves(Permutation permutation) {
[3098]64      IRandom random = RandomParameter.ActualValue;
[3232]65      return new InversionMove[] { Apply(permutation, random) };
[3098]66    }
67  }
68}
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