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source: trunk/sources/HeuristicLab.Optimization.Operators/3.3/SASEGASAReunificator.cs @ 9048

Last change on this file since 9048 was 7259, checked in by swagner, 13 years ago

Updated year of copyrights to 2012 (#1716)

File size: 4.4 KB
RevLine 
[2]1#region License Information
2/* HeuristicLab
[7259]3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
[2]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;
[4722]24using HeuristicLab.Common;
[2]25using HeuristicLab.Core;
[4068]26using HeuristicLab.Data;
[3451]27using HeuristicLab.Operators;
[4068]28using HeuristicLab.Parameters;
[3451]29using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
[2]30
[3451]31namespace HeuristicLab.Optimization.Operators {
[881]32  /// <summary>
33  /// Joins all sub sub scopes of a specified scope, reduces the number of sub
34  /// scopes by 1 and uniformly partitions the sub sub scopes again, maintaining the order.
35  /// </summary>
[3489]36  [Item("SASEGASAReunificator", "This operator merges the villages (sub-scopes) and redistributes the individuals. It is implemented as described in Affenzeller, M. et al. 2009. Genetic Algorithms and Genetic Programming - Modern Concepts and Practical Applications, CRC Press.")]
[3451]37  [StorableClass]
[3489]38  public class SASEGASAReunificator : SingleSuccessorOperator {
[2]39
[3479]40    public LookupParameter<IntValue> VillageCountParameter {
41      get { return (LookupParameter<IntValue>)Parameters["VillageCount"]; }
42    }
43
[4722]44    [StorableConstructor]
45    protected SASEGASAReunificator(bool deserializing) : base(deserializing) { }
46    protected SASEGASAReunificator(SASEGASAReunificator original, Cloner cloner) : base(original, cloner) { }
[3479]47    public SASEGASAReunificator()
48      : base() {
49      Parameters.Add(new LookupParameter<IntValue>("VillageCount", "The number of villages left after the reunification."));
50    }
[4722]51
52    public override IDeepCloneable Clone(Cloner cloner) {
53      return new SASEGASAReunificator(this, cloner);
54    }
55
[881]56    /// <summary>
57    /// Joins all sub sub scopes of the given <paramref name="scope"/>, reduces the number of sub
58    /// scopes by 1 and uniformly partitions the sub sub scopes again, maintaining the order.
59    /// </summary>
[3479]60    /// <exception cref="InvalidOperationException">Thrown when there are less than 2 sub-scopes available or when VillageCount does not equal the number of sub-scopes.</exception>
[881]61    /// <param name="scope">The current scope whose sub scopes to reduce.</param>
62    /// <returns><c>null</c>.</returns>
[3451]63    public override IOperation Apply() {
64      IScope scope = ExecutionContext.Scope;
[3479]65      if (VillageCountParameter.ActualValue == null) VillageCountParameter.ActualValue = new IntValue(scope.SubScopes.Count);
66      int villageCount = VillageCountParameter.ActualValue.Value;
[3451]67      if (villageCount <= 1)
[3479]68        throw new InvalidOperationException(Name + ": Reunification requires 2 or more sub-scopes");
69      if (villageCount != scope.SubScopes.Count)
70        throw new InvalidOperationException(Name + ": VillageCount does not equal the number of sub-scopes");
[2]71
[3451]72      // get all villages
[3479]73      List<IScope> population = new List<IScope>();
[3451]74      for (int i = 0; i < villageCount; i++) {
[3479]75        population.AddRange(scope.SubScopes[i].SubScopes);
[3451]76        scope.SubScopes[i].SubScopes.Clear();
[2]77      }
78
[3451]79      // reduce number of villages by 1 and partition the population again
[4489]80      scope.SubScopes.RemoveAt(scope.SubScopes.Count - 1);
[3451]81      villageCount--;
82      int populationPerVillage = population.Count / villageCount;
83      for (int i = 0; i < villageCount; i++) {
[3479]84        scope.SubScopes[i].SubScopes.AddRange(population.GetRange(0, populationPerVillage));
85        population.RemoveRange(0, populationPerVillage);
[2]86      }
87
[3489]88      // add remaining individuals to last village
[3479]89      scope.SubScopes[scope.SubScopes.Count - 1].SubScopes.AddRange(population);
90      population.Clear();
[2]91
[3479]92      VillageCountParameter.ActualValue.Value = villageCount;
93
[3451]94      return base.Apply();
[2]95    }
[3479]96  }
[2]97}
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