source: trunk/sources/HeuristicLab.Encodings.RealVectorEncoding/3.3/ParticleOperators/RealVectorNeighborhoodParticleUpdater.cs @ 15091

Last change on this file since 15091 was 15091, checked in by abeham, 14 months ago

#2797:

  • Updated PSO to make it more compatible with SPSO 2011
  • Removed truncation of velocity vector and instead rescaled it given the maximum velocity
  • Added non-zero initial velocity according to SPSO 2011
  • Removed complicated bouncing code due to box constraints and instead implemented as described in SPSO 2011
  • Calculating neighbor best has been changed to use personal best
  • Avoiding local and global particle update and instead relying on neighborbest
  • More randomization during velocity update by using a separate random numbers per dimension
  • Reusing problem specific solution creator in RealVectorParticleCreator instead of always using UniformRandomRealVectorCreator
File size: 2.0 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.Encodings.RealVectorEncoding {
27  [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.")]
28  [StorableClass]
29  public sealed class RealVectorNeighborhoodParticleUpdater : RealVectorParticleUpdater {
30
31    #region Construction & Cloning
32    [StorableConstructor]
33    private RealVectorNeighborhoodParticleUpdater(bool deserializing) : base(deserializing) { }
34    private RealVectorNeighborhoodParticleUpdater(RealVectorNeighborhoodParticleUpdater original, Cloner cloner) : base(original, cloner) { }
35    public RealVectorNeighborhoodParticleUpdater() : base() { }
36    public override IDeepCloneable Clone(Cloner cloner) {
37      return new RealVectorNeighborhoodParticleUpdater(this, cloner);
38    }
39    #endregion
40
41    public override IOperation Apply() {
42      UpdateVelocity();
43      UpdatePosition();
44
45      return base.Apply();
46    }
47  }
48}
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