source: branches/histogram/HeuristicLab.Selection/3.3/RandomSelector.cs @ 6055

Last change on this file since 6055 was 6055, checked in by abeham, 9 years ago

#1465

  • updated branch from trunk
File size: 3.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2011 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.Collections.Generic;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Optimization;
27using HeuristicLab.Parameters;
28using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
29
30namespace HeuristicLab.Selection {
31  /// <summary>
32  /// A random selection operator.
33  /// </summary>
34  [Item("RandomSelector", "A random selection operator.")]
35  [StorableClass]
36  public sealed class RandomSelector : StochasticSelector, ISelector {
37    private IValueParameter<BoolValue> CopySelectedParameter {
38      get { return (IValueParameter<BoolValue>)Parameters["CopySelected"]; }
39    }
40    public IValueLookupParameter<IntValue> NumberOfSelectedSubScopesParameter {
41      get { return (ValueLookupParameter<IntValue>)Parameters["NumberOfSelectedSubScopes"]; }
42    }
43
44    public BoolValue CopySelected {
45      get { return CopySelectedParameter.Value; }
46      set { CopySelectedParameter.Value = value; }
47    }
48
49    [StorableConstructor]
50    private RandomSelector(bool deserializing) : base(deserializing) { }
51    private RandomSelector(RandomSelector original, Cloner cloner)
52      : base(original, cloner) {
53    }
54    public override IDeepCloneable Clone(Cloner cloner) {
55      return new RandomSelector(this, cloner);
56    }
57    public RandomSelector()
58      : base() {
59      Parameters.Add(new ValueParameter<BoolValue>("CopySelected", "True if the selected sub-scopes should be copied, otherwise false.", new BoolValue(true)));
60      Parameters.Add(new ValueLookupParameter<IntValue>("NumberOfSelectedSubScopes", "The number of sub-scopes which should be selected."));
61      CopySelectedParameter.Hidden = true;
62    }
63
64    protected override IScope[] Select(List<IScope> scopes) {
65      int count = NumberOfSelectedSubScopesParameter.ActualValue.Value;
66      bool copy = CopySelectedParameter.Value.Value;
67      IRandom random = RandomParameter.ActualValue;
68      IScope[] selected = new IScope[count];
69
70      for (int i = 0; i < count; i++) {
71        if (copy)
72          selected[i] = (IScope)scopes[random.Next(scopes.Count)].Clone();
73        else {
74          int index = random.Next(scopes.Count);
75          selected[i] = scopes[index];
76          scopes.RemoveAt(index);
77        }
78      }
79      return selected;
80    }
81  }
82}
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