source: trunk/sources/HeuristicLab.Encodings.RealVectorEncoding/3.3/ParticleOperators/RealVectorNeighborhoodParticleUpdater.cs @ 15102

Last change on this file since 15102 was 15102, checked in by abeham, 10 months ago

#2797:

  • Recreated backwards compatibility by readding old operators and renaming new operators to SPSO*
    • If a previously configured algorithm is run again, the same results should be obtained
  • Set all old operators to internal, NonDiscoverableType, and Obsolete (they are also not fixed, e.g. PersonalBest update remains flawed)
  • Added SPSO 2007 velocity initializer and let users choose in SPSOParticleCreator
  • Changed description of PSO
  • Updated sample
File size: 2.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 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 HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26using HeuristicLab.PluginInfrastructure;
27
28namespace HeuristicLab.Encodings.RealVectorEncoding {
29  [Item("Neighborhood Particle Updater", "Updates the particle's position using (among other things) the best neighbor's position. Point = Point + Velocity*Inertia + (PersonalBestPoint-Point)*Phi_P*r_p + (BestNeighborPoint-Point)*Phi_G*r_g.")]
30  [StorableClass]
31  [NonDiscoverableType]
32  [Obsolete("Use SPSO2011ParticleUpdater")]
33  internal sealed class RealVectorNeighborhoodParticleUpdater : RealVectorParticleUpdater {
34
35    #region Construction & Cloning
36    [StorableConstructor]
37    private RealVectorNeighborhoodParticleUpdater(bool deserializing) : base(deserializing) { }
38    private RealVectorNeighborhoodParticleUpdater(RealVectorNeighborhoodParticleUpdater original, Cloner cloner) : base(original, cloner) { }
39    public RealVectorNeighborhoodParticleUpdater() : base() { }
40    public override IDeepCloneable Clone(Cloner cloner) {
41      return new RealVectorNeighborhoodParticleUpdater(this, cloner);
42    }
43    #endregion
44
45    public override IOperation Apply() {
46      double inertia = Inertia.Value;
47      double personalBestAttraction = PersonalBestAttraction.Value;
48      double neighborBestAttraction = NeighborBestAttraction.Value;
49
50      RealVector velocity = new RealVector(Velocity.Length);
51      RealVector position = new RealVector(RealVector.Length);
52      double r_p = Random.NextDouble();
53      double r_g = Random.NextDouble();
54
55      for (int i = 0; i < velocity.Length; i++) {
56        velocity[i] =
57          Velocity[i] * inertia +
58          (PersonalBest[i] - RealVector[i]) * personalBestAttraction * r_p +
59          (BestPoint[i] - RealVector[i]) * neighborBestAttraction * r_g;
60      }
61
62      MoveParticle(velocity, position);
63
64      return base.Apply();
65    }
66  }
67}
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