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source: trunk/sources/HeuristicLab.Optimization.Operators/3.3/SingleObjectivePathRelinker.cs @ 15675

Last change on this file since 15675 was 15583, checked in by swagner, 7 years ago

#2640: Updated year of copyrights in license headers

File size: 3.6 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Data;
25using HeuristicLab.Operators;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Optimization.Operators {
30  /// <summary>
31  /// A base class for operators that perform path relinking between single objective solutions.
32  /// </summary>
33  [Item("SingleObjectivePathRelinker", "A base class for operators that perform path relinking between single objective solutions.")]
34  [StorableClass]
35  public abstract class SingleObjectivePathRelinker : SingleSuccessorOperator, ISingleObjectivePathRelinker {
36    #region Parameter properties
37    public ScopeParameter CurrentScopeParameter {
38      get { return (ScopeParameter)Parameters["CurrentScope"]; }
39    }
40    public ILookupParameter<ItemArray<IItem>> ParentsParameter {
41      get { return (IScopeTreeLookupParameter<IItem>)Parameters["Parents"]; }
42    }
43    public IValueParameter<PercentValue> RelinkingAccuracyParameter {
44      get { return (IValueParameter<PercentValue>)Parameters["RelinkingAccuracy"]; }
45    }
46    #endregion
47
48    #region Properties
49    private IScope CurrentScope {
50      get { return CurrentScopeParameter.ActualValue; }
51    }
52    private ItemArray<IItem> Parents {
53      get { return ParentsParameter.ActualValue; }
54    }
55    private PercentValue RelinkingAccuracy {
56      get { return RelinkingAccuracyParameter.Value; }
57    }
58    #endregion
59
60    [StorableConstructor]
61    protected SingleObjectivePathRelinker(bool deserializing) : base(deserializing) { }
62    protected SingleObjectivePathRelinker(SingleObjectivePathRelinker original, Cloner cloner) : base(original, cloner) { }
63    protected SingleObjectivePathRelinker()
64      : base() {
65      #region Create parameters
66      Parameters.Add(new ScopeParameter("CurrentScope", "The current scope that contains the parents."));
67      Parameters.Add(new ScopeTreeLookupParameter<IItem>("Parents", "The parents used for path relinking."));
68      Parameters.Add(new ValueParameter<PercentValue>("RelinkingAccuracy", "The percentage of relinked offspring that should be yielded.", new PercentValue(0.25)));
69      #endregion
70    }
71
72    public sealed override IOperation Apply() {
73      ItemArray<IItem> relinkedSolutions = Relink(Parents, RelinkingAccuracy);
74      var offspringScope = new Scope("Offspring");
75      foreach (var solution in relinkedSolutions) {
76        var scope = new Scope();
77        scope.Variables.Add(new Variable(ParentsParameter.ActualName, solution));
78        offspringScope.SubScopes.Add(scope);
79      }
80      CurrentScope.SubScopes.Add(offspringScope);
81      return base.Apply();
82    }
83
84    protected abstract ItemArray<IItem> Relink(ItemArray<IItem> parents, PercentValue n);
85  }
86}
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