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source: branches/CEDMA-Exporter-715/sources/HeuristicLab.Selection/3.3/TournamentSelector.cs @ 2319

Last change on this file since 2319 was 1530, checked in by gkronber, 16 years ago

Moved source files of plugins Hive ... Visualization.Test into version-specific sub-folders. #576

File size: 4.2 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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;
23using System.Collections.Generic;
24using System.Text;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27
28namespace HeuristicLab.Selection {
29  /// <summary>
30  /// Moves or copies a defined number of the best sub scopes from a source scope to a target scope.
31  /// </summary>
32  public class TournamentSelector : StochasticSelectorBase {
33    /// <inheritdoc select="summary"/>
34    public override string Description {
35      get { return @"TODO\r\nOperator description still missing ..."; }
36    }
37
38    /// <summary>
39    /// Initializes a new instance of <see cref="TournamentSelector"/> with three variable infos
40    /// (<c>Maximization</c>, <c>Quality</c> and <c>GroupSize</c>, being a local variable and set to
41    /// <c>2</c>) with <c>CopySelected</c> set to <c>true</c>.
42    /// </summary>
43    public TournamentSelector() {
44      AddVariableInfo(new VariableInfo("Maximization", "Maximization problem", typeof(BoolData), VariableKind.In));
45      AddVariableInfo(new VariableInfo("Quality", "Quality value", typeof(DoubleData), VariableKind.In));
46      AddVariableInfo(new VariableInfo("GroupSize", "Size of the tournament group", typeof(IntData), VariableKind.In));
47      GetVariableInfo("GroupSize").Local = true;
48      AddVariable(new Variable("GroupSize", new IntData(2)));
49      GetVariable("CopySelected").GetValue<BoolData>().Data = true;
50    }
51
52    /// <summary>
53    /// Copies or moves the best sub scopes from the given <paramref name="source"/> to the specified
54    /// <paramref name="target"/>.
55    /// </summary>
56    /// <exception cref="InvalidOperationException">Thrown when no source sub scopes are available.</exception>
57    /// <param name="random">The random number generator.</param>
58    /// <param name="source">The source scope from where to copy/move the sub scopes.</param>
59    /// <param name="selected">The number of sub scopes to copy/move.</param>
60    /// <param name="target">The target scope where to add the sub scopes.</param>
61    /// <param name="copySelected">Boolean flag whether the sub scopes shall be moved or copied.</param>
62    protected override void Select(IRandom random, IScope source, int selected, IScope target, bool copySelected) {
63      IVariableInfo qualityInfo = GetVariableInfo("Quality");
64      bool maximization = GetVariableValue<BoolData>("Maximization", source, true).Data;
65      int groupSize = GetVariableValue<IntData>("GroupSize", source, true).Data;
66      for (int i = 0; i < selected; i++) {
67        if (source.SubScopes.Count < 1) throw new InvalidOperationException("No source scopes available to select.");
68
69        IScope selectedScope = source.SubScopes[random.Next(source.SubScopes.Count)];
70        double best = selectedScope.GetVariableValue<DoubleData>(qualityInfo.FormalName, false).Data;
71        for (int j = 1; j < groupSize; j++) {
72          IScope scope = source.SubScopes[random.Next(source.SubScopes.Count)];
73          double quality = scope.GetVariableValue<DoubleData>(qualityInfo.FormalName, false).Data;
74          if (((maximization) && (quality > best)) ||
75              ((!maximization) && (quality < best))) {
76            best = quality;
77            selectedScope = scope;
78          }
79        }
80
81        if (copySelected)
82          target.AddSubScope((IScope)selectedScope.Clone());
83        else {
84          source.RemoveSubScope(selectedScope);
85          target.AddSubScope(selectedScope);
86        }
87      }
88    }
89  }
90}
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