1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2017 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.Threading;
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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.Optimization;
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27 | using HeuristicLab.Parameters;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 | using HeuristicLab.Random;
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30 | using HEAL.Attic;
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31 |
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32 | namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Algorithms {
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33 | [Item("Stochastic Algorithm", "Stochastic context-based algorithms to facilitate applying operators.")]
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34 | [StorableType("75B72520-ECBC-42F7-8560-448940825847")]
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35 | public abstract class StochasticAlgorithm<TContext, TEncoding> : ContextAlgorithm<TContext, TEncoding>
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36 | where TContext : class, IStochasticContext, new()
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37 | where TEncoding : class, IEncoding {
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38 |
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39 | [Storable]
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40 | private FixedValueParameter<BoolValue> setSeedRandomlyParameter;
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41 | private IFixedValueParameter<BoolValue> SetSeedRandomlyParameter {
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42 | get { return setSeedRandomlyParameter; }
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43 | }
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44 | [Storable]
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45 | private FixedValueParameter<IntValue> seedParameter;
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46 | private IFixedValueParameter<IntValue> SeedParameter {
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47 | get { return seedParameter; }
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48 | }
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49 |
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50 | public bool SetSeedRandomly {
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51 | get { return setSeedRandomlyParameter.Value.Value; }
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52 | set { setSeedRandomlyParameter.Value.Value = value; }
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53 | }
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54 | public int Seed {
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55 | get { return seedParameter.Value.Value; }
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56 | set { seedParameter.Value.Value = value; }
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57 | }
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58 |
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59 | [StorableConstructor]
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60 | protected StochasticAlgorithm(StorableConstructorFlag _) : base(_) { }
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61 | protected StochasticAlgorithm(StochasticAlgorithm<TContext, TEncoding> original, Cloner cloner)
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62 | : base(original, cloner) {
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63 | setSeedRandomlyParameter = cloner.Clone(original.setSeedRandomlyParameter);
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64 | seedParameter = cloner.Clone(original.seedParameter);
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65 | }
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66 | protected StochasticAlgorithm()
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67 | : base() {
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68 | Parameters.Add(setSeedRandomlyParameter = new FixedValueParameter<BoolValue>("SetSeedRandomly", "Whether to overwrite the seed with a random value each time the algorithm is run.", new BoolValue(true)));
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69 | Parameters.Add(seedParameter = new FixedValueParameter<IntValue>("Seed", "The random seed that is used in the stochastic algorithm", new IntValue(0)));
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70 | }
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71 |
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72 | protected override void Initialize(CancellationToken cancellationToken) {
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73 | base.Initialize(cancellationToken);
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74 |
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75 | if (SetSeedRandomly) {
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76 | var rnd = new System.Random();
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77 | Seed = rnd.Next();
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78 | }
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79 |
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80 | Context.Random = new MersenneTwister((uint)Seed);
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81 | }
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82 | }
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83 | }
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