source: trunk/sources/HeuristicLab.Algorithms.ParticleSwarmOptimization/3.3/VonNeumannTopologyInitializer.cs @ 15181

Last change on this file since 15181 was 15181, checked in by abeham, 3 years ago

#2797:

  • Added IStochasticOperator interface to MultiPSOTopologyUpdater
  • Changed parameter defaults to those described in the paper
  • Added analyzer placeholder for the last iteration (has not been previously analyzed)
  • Changed random topology initializer to include itself (to be able to use it with SPSOSwarmUpdater -> this should not change the old RealVectorSwarmUpdater)
  • Changed ring topology initializer to include itself (same as above)
  • Changed von neumann topology initializer to include itself (same as above)
  • Added SPSO compatible random topology initializer (as described in the paper by Clerc)
  • Changed sampling of the random directional vector to be uniformly random on the surface of a hypersphere to avoid a slight bias in diagonal direction
  • Updating SwarmBestQuality and BestRealVector parameters in SPSOSwarmUpdater (an oversight)
  • Added a faster method to create a copy of a RealVector (based on Array.Copy)
  • Updated the sample
  • Updated the sample's test results (due to changed sampling in SPSO2011ParticleUpdater)
File size: 2.4 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;
25using HeuristicLab.Data;
26
27namespace HeuristicLab.Algorithms.ParticleSwarmOptimization {
28  [Item("Von Neumann Topology Initializer", "Every particle is informed by the two following and the two previous particles wrapping around at the beginning and the end of the swarm (in addition each particle also informs itself).")]
29  [StorableClass]
30  public sealed class VonNeumannTopologyInitializer : TopologyInitializer {
31
32    #region Construction & Cloning
33
34    [StorableConstructor]
35    private VonNeumannTopologyInitializer(bool deserializing) : base(deserializing) { }
36    private VonNeumannTopologyInitializer(VonNeumannTopologyInitializer original, Cloner cloner) : base(original, cloner) { }
37    public VonNeumannTopologyInitializer() : base() { }
38
39    public override IDeepCloneable Clone(Cloner cloner) {
40      return new VonNeumannTopologyInitializer(this, cloner);
41    }
42
43    #endregion
44
45    public override IOperation Apply() {
46      var swarmSize = SwarmSizeParameter.ActualValue.Value;
47
48      ItemArray<IntArray> neighbors = new ItemArray<IntArray>(swarmSize);
49      for (int i = 0; i < swarmSize; i++) {
50        neighbors[i] = new IntArray(new[] {
51          (swarmSize + i-2) % swarmSize,
52          (swarmSize + i-1) % swarmSize,
53          i,
54          (i+1) % swarmSize,
55          (i+2) % swarmSize
56        });
57      }
58      NeighborsParameter.ActualValue = neighbors;
59      return base.Apply();
60    }
61  }
62}
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