source: trunk/sources/HeuristicLab.Encodings.RealVectorEncoding/3.3/ParticleOperators/RealVectorParticleUpdater.cs @ 12012

Last change on this file since 12012 was 12012, checked in by ascheibe, 5 years ago

#2212 merged r12008, r12009, r12010 back into trunk

File size: 7.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 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 System;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Operators;
27using HeuristicLab.Parameters;
28using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
29
30namespace HeuristicLab.Encodings.RealVectorEncoding {
31
32  [Item("RealVectorParticleUpdater", "Updates a certain particle taking the current position and velocity into account, as well as the best point and the best point in a local neighborhood.")]
33  [StorableClass]
34  public abstract class RealVectorParticleUpdater : SingleSuccessorOperator, IRealVectorParticleUpdater {
35
36    public override bool CanChangeName {
37      get { return false; }
38    }
39
40    #region Parameter properties
41    public ILookupParameter<IRandom> RandomParameter {
42      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
43    }
44    public ILookupParameter<RealVector> VelocityParameter {
45      get { return (ILookupParameter<RealVector>)Parameters["Velocity"]; }
46    }
47    public ILookupParameter<RealVector> PersonalBestParameter {
48      get { return (ILookupParameter<RealVector>)Parameters["PersonalBest"]; }
49    }
50    public ILookupParameter<RealVector> NeighborBestParameter {
51      get { return (ILookupParameter<RealVector>)Parameters["NeighborBest"]; }
52    }
53    public LookupParameter<RealVector> BestRealVectorParameter {
54      get { return (LookupParameter<RealVector>)Parameters["BestRealVector"]; }
55    }
56    public ILookupParameter<RealVector> RealVectorParameter {
57      get { return (ILookupParameter<RealVector>)Parameters["RealVector"]; }
58    }
59    public ILookupParameter<DoubleMatrix> BoundsParameter {
60      get { return (ILookupParameter<DoubleMatrix>)Parameters["Bounds"]; }
61    }
62    public ILookupParameter<DoubleMatrix> CurrentVelocityBoundsParameter {
63      get { return (ILookupParameter<DoubleMatrix>)Parameters["CurrentVelocityBounds"]; }
64    }
65    public ILookupParameter<DoubleValue> InertiaParameter {
66      get { return (ILookupParameter<DoubleValue>)Parameters["CurrentInertia"]; }
67    }
68    public ILookupParameter<DoubleValue> PersonalBestAttractionParameter {
69      get { return (ILookupParameter<DoubleValue>)Parameters["PersonalBestAttraction"]; }
70    }
71    public ILookupParameter<DoubleValue> NeighborBestAttractionParameter {
72      get { return (ILookupParameter<DoubleValue>)Parameters["NeighborBestAttraction"]; }
73    }
74    #endregion
75
76    #region Parameter Values
77    protected IRandom Random {
78      get { return RandomParameter.ActualValue; }
79    }
80    protected RealVector Velocity {
81      get { return VelocityParameter.ActualValue; }
82      set { VelocityParameter.ActualValue = value; }
83    }
84    protected RealVector PersonalBest {
85      get { return PersonalBestParameter.ActualValue; }
86    }
87    protected RealVector BestPoint {
88      get { return BestRealVectorParameter.ActualValue; }
89    }
90    protected RealVector RealVector {
91      get { return RealVectorParameter.ActualValue; }
92      set { RealVectorParameter.ActualValue = value; }
93    }
94    protected RealVector NeighborBest {
95      get { return NeighborBestParameter.ActualValue; }
96    }
97    protected DoubleMatrix Bounds {
98      get { return BoundsParameter.ActualValue; }
99    }
100    protected DoubleMatrix CurrentVelocityBounds {
101      get { return CurrentVelocityBoundsParameter.ActualValue; }
102    }
103    protected DoubleValue Inertia {
104      get { return InertiaParameter.ActualValue; }
105    }
106    protected DoubleValue PersonalBestAttraction {
107      get { return PersonalBestAttractionParameter.ActualValue; }
108    }
109    protected DoubleValue NeighborBestAttraction {
110      get { return NeighborBestAttractionParameter.ActualValue; }
111    }
112    #endregion
113
114    #region Construction & Cloning
115    [StorableConstructor]
116    protected RealVectorParticleUpdater(bool deserializing) : base(deserializing) { }
117    protected RealVectorParticleUpdater(RealVectorParticleUpdater original, Cloner cloner) : base(original, cloner) { }
118    public RealVectorParticleUpdater()
119      : base() {
120      Parameters.Add(new LookupParameter<IRandom>("Random", "Random number generator."));
121      Parameters.Add(new LookupParameter<RealVector>("RealVector", "Particle's current solution"));
122      Parameters.Add(new LookupParameter<RealVector>("Velocity", "Particle's current velocity."));
123      Parameters.Add(new LookupParameter<RealVector>("PersonalBest", "Particle's personal best solution."));
124      Parameters.Add(new LookupParameter<RealVector>("BestRealVector", "Global best position."));
125      Parameters.Add(new LookupParameter<RealVector>("NeighborBest", "Best neighboring solution."));
126      Parameters.Add(new LookupParameter<DoubleMatrix>("Bounds", "The lower and upper bounds for each dimension of the position vector for the current problem."));
127      Parameters.Add(new LookupParameter<DoubleMatrix>("CurrentVelocityBounds", "Upper and lower bounds for the particle's velocity vector."));
128      Parameters.Add(new LookupParameter<DoubleValue>("CurrentInertia", "The weight for the particle's velocity vector."));
129      Parameters.Add(new LookupParameter<DoubleValue>("PersonalBestAttraction", "The weight for the particle's personal best position."));
130      Parameters.Add(new LookupParameter<DoubleValue>("NeighborBestAttraction", "The weight for the global best position."));
131    }
132    #endregion
133
134    protected void MoveParticle(RealVector velocity, RealVector position) {
135      BoundsChecker.Apply(velocity, CurrentVelocityBounds);
136      for (int i = 0; i < velocity.Length; i++) {
137        position[i] = RealVector[i] + velocity[i];
138      }
139      for (int i = 0; i < position.Length; i++) {
140        double min = Bounds[i % Bounds.Rows, 0];
141        double max = Bounds[i % Bounds.Rows, 1];
142        if (position[i] < min) {
143          int reflectionCount = (int)Math.Truncate((min - position[i]) / (max - min)) + 1;
144          double reflection = (min - position[i]) % (max - min);
145          if (IsOdd(reflectionCount)) {
146            position[i] = min + reflection;
147            velocity[i] = -velocity[i];
148
149          } else {
150            position[i] = max - reflection;
151          }
152        }
153        if (position[i] > max) {
154          int reflectionCount = (int)Math.Truncate((position[i] - max) / (max - min)) + 1;
155          double reflection = (position[i] - max) % (max - min);
156          if (IsOdd(reflectionCount)) {
157            position[i] = max - reflection;
158            velocity[i] = -velocity[i];
159          } else {
160            position[i] = min + reflection;
161          }
162        }
163      }
164
165      RealVector = position;
166      Velocity = velocity;
167    }
168
169    private static bool IsOdd(int number) {
170      return number % 2 == 1;
171    }
172  }
173}
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