1  #region License Information


2  /* HeuristicLab


3  * Copyright (C) 20022011 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 


22  using HeuristicLab.Common;


23  using HeuristicLab.Core;


24  using HeuristicLab.Optimization;


25  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;


26 


27  namespace HeuristicLab.Encodings.RealVectorEncoding {


28  [Item("Neighborhood Particle Updater", "Updates the particle's position using (among other things) the best neighbor's position. Point = Point + Velocity*Inertia + (PersonalBestPointPoint)*Phi_P*r_p + (BestNeighborPointPoint)*Phi_G*r_g.")]


29  [StorableClass]


30  public sealed class RealVectorNeighborhoodParticleUpdater : RealVectorParticleUpdater, ILocalParticleUpdater {


31 


32  #region Construction & Cloning


33  [StorableConstructor]


34  private RealVectorNeighborhoodParticleUpdater(bool deserializing) : base(deserializing) { }


35  private RealVectorNeighborhoodParticleUpdater(RealVectorNeighborhoodParticleUpdater original, Cloner cloner) : base(original, cloner) { }


36  public RealVectorNeighborhoodParticleUpdater() : base() { }


37  public override IDeepCloneable Clone(Cloner cloner) {


38  return new RealVectorNeighborhoodParticleUpdater(this, cloner);


39  }


40  #endregion


41 


42  public override IOperation Apply() {


43  double inertia = Inertia.Value;


44  double personalBestAttraction = PersonalBestAttraction.Value;


45  double neighborBestAttraction = NeighborBestAttraction.Value;


46 


47  RealVector velocity = new RealVector(Velocity.Length);


48  RealVector position = new RealVector(RealVector.Length);


49  double r_p = Random.NextDouble();


50  double r_g = Random.NextDouble();


51 


52  for (int i = 0; i < velocity.Length; i++) {


53  velocity[i] =


54  Velocity[i] * inertia +


55  (PersonalBest[i]  RealVector[i]) * personalBestAttraction * r_p +


56  (BestPoint[i]  RealVector[i]) * neighborBestAttraction * r_g;


57  }


58 


59  BoundsChecker.Apply(velocity, CurrentVelocityBounds);


60  for (int i = 0; i < velocity.Length; i++) {


61  position[i] = RealVector[i] + velocity[i];


62  }


63  BoundsChecker.Apply(position, Bounds);


64 


65  RealVector = position;


66  Velocity = velocity;


67 


68  return base.Apply();


69  }


70  }


71  }

