source: trunk/sources/HeuristicLab.Encodings.RealVectorEncoding/3.3/ParticleOperators/RealVectorNeighborhoodParticleUpdater.cs @ 5560

Last change on this file since 5560 was 5560, checked in by mkofler, 7 years ago

#852: Code refactoring. Created new interfaces and moved operators to respective projects as suggested in A. Beham's review. Work in progress.

File size: 2.9 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Encodings.RealVectorEncoding;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26using HeuristicLab.Optimization;
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  public sealed class RealVectorNeighborhoodParticleUpdater : RealVectorParticleUpdater, ILocalParticleUpdater {
32
33    [StorableConstructor]
34    private RealVectorNeighborhoodParticleUpdater(bool deserializing) : base(deserializing) { }
35    private RealVectorNeighborhoodParticleUpdater(RealVectorNeighborhoodParticleUpdater original, Cloner cloner) : base(original, cloner) { }
36    public RealVectorNeighborhoodParticleUpdater() : base() { }
37
38    public override IDeepCloneable Clone(Cloner cloner) {
39      return new RealVectorNeighborhoodParticleUpdater(this, cloner);
40    }
41
42    public override IOperation Apply() {
43      RealVector velocity = new RealVector(Velocity.Length);
44      RealVector position = new RealVector(RealVector.Length);
45      double r_p = Random.NextDouble();
46      double r_g = Random.NextDouble();
47      double omega = Inertia.Value;
48      double phi_p = PersonalBestAttraction.Value;
49      double phi_g = NeighborsBestAttraction.Value;
50      for (int i = 0; i < velocity.Length; i++) {
51        velocity[i] =
52          Velocity[i] * omega +
53          (PersonalBest[i] - RealVector[i]) * phi_p * r_p +
54          (NeighborsBest[i] - RealVector[i]) * phi_g * r_g;
55      }
56      BoundsChecker.Apply(velocity, VelocityBounds);
57      for (int i = 0; i < velocity.Length; i++) {
58        position[i] = RealVector[i] + velocity[i];
59      }
60      BoundsChecker.Apply(position, Bounds);
61      RealVector = position;
62      Velocity = velocity;
63
64      return base.Apply();
65    }
66  }
67}
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