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source: branches/2817-BinPackingSpeedup/HeuristicLab.Problems.Binary/3.3/DeceptiveStepTrapProblem.cs @ 15630

Last change on this file since 15630 was 14185, checked in by swagner, 8 years ago

#2526: Updated year of copyrights in license headers

File size: 3.2 KB
Line 
1#region License Information
2
3/* HeuristicLab
4 * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
5 *
6 * This file is part of HeuristicLab.
7 *
8 * HeuristicLab is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * HeuristicLab is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#endregion
23
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Encodings.BinaryVectorEncoding;
28using HeuristicLab.Parameters;
29using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
30
31namespace HeuristicLab.Problems.Binary {
32  [Item("Deceptive Step Trap Problem", "Genome encodes completely separable blocks, where each block deceptive with fitness plateaus.")]
33  [StorableClass]
34  [Creatable(CreatableAttribute.Categories.CombinatorialProblems, Priority = 230)]
35  public class DeceptiveStepTrapProblem : DeceptiveTrapProblem {
36    [StorableConstructor]
37    protected DeceptiveStepTrapProblem(bool deserializing) : base(deserializing) { }
38    protected DeceptiveStepTrapProblem(DeceptiveStepTrapProblem original, Cloner cloner)
39      : base(original, cloner) {
40      RegisterParameterEvents();
41    }
42    public override IDeepCloneable Clone(Cloner cloner) {
43      return new DeceptiveStepTrapProblem(this, cloner);
44    }
45
46    private const string StepSizeParameterName = "Step Size";
47
48    public IFixedValueParameter<IntValue> StepSizeParameter {
49      get { return (IFixedValueParameter<IntValue>)Parameters[StepSizeParameterName]; }
50    }
51
52    public int StepSize {
53      get { return StepSizeParameter.Value.Value; }
54      set { StepSizeParameter.Value.Value = value; }
55    }
56
57    public DeceptiveStepTrapProblem()
58      : base() {
59      Parameters.Add(new FixedValueParameter<IntValue>(StepSizeParameterName, "", new IntValue(2)));
60      RegisterParameterEvents();
61    }
62
63    [StorableHook(HookType.AfterDeserialization)]
64    private void AfterDeserialization() {
65      RegisterParameterEvents();
66    }
67
68    private void RegisterParameterEvents() {
69      TrapSizeParameter.Value.ValueChanged += (o, e) => { offset = -1; };
70      StepSizeParameter.Value.ValueChanged += (o, e) => { offset = -1; };
71    }
72
73
74    private int offset = -1;
75    private int Offset {
76      get {
77        if (offset == -1) offset = (TrapSize - StepSize) % StepSize;
78        return offset;
79      }
80    }
81
82    protected override int TrapMaximum {
83      get { return (Offset + TrapSize) / StepSize; }
84    }
85
86    protected override int Score(BinaryVector individual, int trapIndex, int trapSize) {
87      int partial = base.Score(individual, trapIndex, trapSize);
88      // introduce plateaus using integer division
89      return (Offset + partial) / StepSize;
90    }
91  }
92}
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