source: branches/HeuristicLab.EvolutionTracking/HeuristicLab.EvolutionTracking/3.4/Operators/BeforeManipulatorOperator.cs @ 10888

Last change on this file since 10888 was 10888, checked in by bburlacu, 8 years ago

#1772: Introduced separate class for FragmentNodes and adjusted tracing code. Fixed small bug creating the genealogy graph.

File size: 3.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2014 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.Linq;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Parameters;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.EvolutionTracking {
29  [StorableClass]
30  [Item("AfterCrossoverOperator", "Performs an action after the crossover operator is applied.")]
31  public class BeforeManipulatorOperator<T> : EvolutionTrackingOperator<T>, IManipulatorOperator<T> where T : class,IItem {
32
33    private const string ChildParameterName = "Child";
34
35    public ILookupParameter<T> ChildParameter {
36      get { return (ILookupParameter<T>)Parameters[ChildParameterName]; }
37    }
38
39    protected BeforeManipulatorOperator(BeforeManipulatorOperator<T> original, Cloner cloner)
40      : base(original, cloner) {
41    }
42    public override IDeepCloneable Clone(Cloner cloner) {
43      return new BeforeManipulatorOperator<T>(this, cloner);
44    }
45
46    public BeforeManipulatorOperator() {
47      Parameters.Add(new LookupParameter<T>(ChildParameterName));
48    }
49
50    public override IOperation Apply() {
51      var vChild = (IGenealogyGraphNode<T>)GenealogyGraph[ChildParameter.ActualValue];
52      if (vChild.Rank.IsAlmost(Generations.Value + 1)) {
53        // if the graph already contains a vertex representing the child, it means that the child is a product of crossover
54        // when mutation follows after crossover, some changes need to be made to the graph to maintain consistency
55        var vClone = new GenealogyGraphNode<T> {
56          Content = (T)ChildParameter.ActualValue.Clone(),
57          Rank = vChild.Parents.Last().Rank + 0.5
58        };
59        GenealogyGraph.AddVertex(vClone);
60
61        foreach (var arc in vChild.InArcs) {
62          arc.Target = vClone;
63          vClone.AddReverseArc(arc);
64        }
65
66        vClone.InArcs.Last().Data = vChild.InArcs.Last().Data; // fragment of child becomes fragment of clone
67        GenealogyGraph.AddArc(vClone, vChild);
68
69        // the following step in necessary because some mutation operators change values while the reference stays the same
70        // so we clone in order to prevent mutations to be "shadowed" in the parent
71        var parent = vClone.Parents.First();
72        parent.Content = (T)parent.Content.Clone();
73        GenealogyGraph[parent.Content] = parent;
74
75      } else if (vChild.Rank.IsAlmost(Generations.Value)) {
76        var clone = (T)ChildParameter.ActualValue.Clone();
77        GenealogyGraph.SetContent(vChild, clone);
78        var xx = new GenealogyGraphNode<T> { Content = ChildParameter.ActualValue, Rank = Generations.Value + 1 };
79        GenealogyGraph.AddVertex(xx);
80        GenealogyGraph.AddArc(vChild, xx);
81      }
82      return base.Apply();
83    }
84  }
85}
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