source: branches/2839_HiveProjectManagement/HeuristicLab.Encodings.RealVectorEncoding/3.3/ParticleOperators/SPSO2007VelocityInitializer.cs @ 16057

Last change on this file since 16057 was 16057, checked in by jkarder, 15 months ago

#2839:

File size: 2.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 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("Velocity Initializer (SPSO 2007)", "Initializes the velocity vector.")]
28  [StorableClass]
29  public class SPSO2007VelocityInitializer : SPSOVelocityInitializer {
30   
31    #region Construction & Cloning
32    [StorableConstructor]
33    protected SPSO2007VelocityInitializer(bool deserializing) : base(deserializing) { }
34    protected SPSO2007VelocityInitializer(SPSO2007VelocityInitializer original, Cloner cloner) : base(original, cloner) { }
35    public SPSO2007VelocityInitializer() : base() { }
36    public override IDeepCloneable Clone(Cloner cloner) {
37      return new SPSO2007VelocityInitializer(this, cloner);
38    }
39    #endregion
40
41    public override IOperation Apply() {
42      var random = RandomParameter.ActualValue;
43      var bounds = BoundsParameter.ActualValue;
44      var position = RealVectorParameter.ActualValue;
45      var velocity = new RealVector(position.Length);
46      for (var i = 0; i < velocity.Length; i++) {
47        var lower = bounds[i % bounds.Rows, 0];
48        var upper = bounds[i % bounds.Rows, 1];
49        velocity[i] = (lower + random.NextDouble() * (upper - lower) - position[i]) / 2.0; // SPSO 2007
50      }
51      VelocityParameter.ActualValue = velocity;
52      return base.Apply();
53    }
54  }
55}
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