source: trunk/sources/HeuristicLab.Encodings.RealVectorEncoding/3.3/ParticleOperators/RealVectorNeighborhoodParticleUpdater.cs @ 12012

Last change on this file since 12012 was 12012, checked in by ascheibe, 4 years ago

#2212 merged r12008, r12009, r12010 back into trunk

File size: 2.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Optimization;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Encodings.RealVectorEncoding {
28  [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.")]
29  [StorableClass]
30  public sealed class RealVectorNeighborhoodParticleUpdater : RealVectorParticleUpdater, ILocalParticleUpdater {
31
32    #region Construction & Cloning
33    [StorableConstructor]
34    private RealVectorNeighborhoodParticleUpdater(bool deserializing) : base(deserializing) { }
35    private RealVectorNeighborhoodParticleUpdater(RealVectorNeighborhoodParticleUpdater original, Cloner cloner) : base(original, cloner) { }
36    public RealVectorNeighborhoodParticleUpdater() : base() { }
37    public override IDeepCloneable Clone(Cloner cloner) {
38      return new RealVectorNeighborhoodParticleUpdater(this, cloner);
39    }
40    #endregion
41
42    public override IOperation Apply() {
43      double inertia = Inertia.Value;
44      double personalBestAttraction = PersonalBestAttraction.Value;
45      double neighborBestAttraction = NeighborBestAttraction.Value;
46
47      RealVector velocity = new RealVector(Velocity.Length);
48      RealVector position = new RealVector(RealVector.Length);
49      double r_p = Random.NextDouble();
50      double r_g = Random.NextDouble();
51
52      for (int i = 0; i < velocity.Length; i++) {
53        velocity[i] =
54          Velocity[i] * inertia +
55          (PersonalBest[i] - RealVector[i]) * personalBestAttraction * r_p +
56          (BestPoint[i] - RealVector[i]) * neighborBestAttraction * r_g;
57      }
58
59      MoveParticle(velocity, position);
60
61      return base.Apply();
62    }
63  }
64}
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