1 | #region License Information |
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2 | /* HeuristicLab |
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3 | * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL) |
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4 | * |
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5 | * This file is part of HeuristicLab. |
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6 | * |
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7 | * HeuristicLab is free software: you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation, either version 3 of the License, or |
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10 | * (at your option) any later version. |
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11 | * |
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12 | * HeuristicLab is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>. |
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19 | */ |
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20 | #endregion |
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21 | |
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22 | using HeuristicLab.Common; |
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23 | using HeuristicLab.Core; |
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24 | using HeuristicLab.Optimization; |
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25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable; |
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26 | |
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27 | namespace HeuristicLab.Encodings.RealVectorEncoding { |
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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.")] |
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29 | [StorableClass] |
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30 | public sealed class RealVectorNeighborhoodParticleUpdater : RealVectorParticleUpdater, ILocalParticleUpdater { |
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31 | |
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32 | #region Construction & Cloning |
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33 | [StorableConstructor] |
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34 | private RealVectorNeighborhoodParticleUpdater(bool deserializing) : base(deserializing) { } |
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35 | private RealVectorNeighborhoodParticleUpdater(RealVectorNeighborhoodParticleUpdater original, Cloner cloner) : base(original, cloner) { } |
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36 | public RealVectorNeighborhoodParticleUpdater() : base() { } |
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37 | public override IDeepCloneable Clone(Cloner cloner) { |
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38 | return new RealVectorNeighborhoodParticleUpdater(this, cloner); |
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39 | } |
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40 | #endregion |
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41 | |
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42 | public override IOperation Apply() { |
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43 | double inertia = Inertia.Value; |
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44 | double personalBestAttraction = PersonalBestAttraction.Value; |
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45 | double neighborBestAttraction = NeighborBestAttraction.Value; |
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46 | |
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47 | RealVector velocity = new RealVector(Velocity.Length); |
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48 | RealVector position = new RealVector(RealVector.Length); |
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49 | double r_p = Random.NextDouble(); |
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50 | double r_g = Random.NextDouble(); |
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51 | |
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52 | for (int i = 0; i < velocity.Length; i++) { |
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53 | velocity[i] = |
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54 | Velocity[i] * inertia + |
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55 | (PersonalBest[i] - RealVector[i]) * personalBestAttraction * r_p + |
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56 | (BestPoint[i] - RealVector[i]) * neighborBestAttraction * r_g; |
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57 | } |
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58 | |
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59 | BoundsChecker.Apply(velocity, VelocityBounds); |
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60 | for (int i = 0; i < velocity.Length; i++) { |
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61 | position[i] = RealVector[i] + velocity[i]; |
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62 | } |
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63 | BoundsChecker.Apply(position, Bounds); |
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64 | |
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65 | RealVector = position; |
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66 | Velocity = velocity; |
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67 | |
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68 | return base.Apply(); |
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69 | } |
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70 | } |
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71 | } |
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