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 |
|
---|
22 | using System;
|
---|
23 | using HeuristicLab.Common;
|
---|
24 | using HeuristicLab.Core;
|
---|
25 | using HeuristicLab.Data;
|
---|
26 | using HeuristicLab.Operators;
|
---|
27 | using HeuristicLab.Parameters;
|
---|
28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
|
---|
29 |
|
---|
30 | namespace 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 ILookupParameter<RealVector> RealVectorParameter {
|
---|
54 | get { return (ILookupParameter<RealVector>)Parameters["RealVector"]; }
|
---|
55 | }
|
---|
56 | public ILookupParameter<DoubleMatrix> BoundsParameter {
|
---|
57 | get { return (ILookupParameter<DoubleMatrix>)Parameters["Bounds"]; }
|
---|
58 | }
|
---|
59 | public ILookupParameter<DoubleValue> CurrentMaxVelocityParameter {
|
---|
60 | get { return (ILookupParameter<DoubleValue>)Parameters["CurrentMaxVelocity"]; }
|
---|
61 | }
|
---|
62 | public ILookupParameter<DoubleValue> InertiaParameter {
|
---|
63 | get { return (ILookupParameter<DoubleValue>)Parameters["CurrentInertia"]; }
|
---|
64 | }
|
---|
65 | public ILookupParameter<DoubleValue> PersonalBestAttractionParameter {
|
---|
66 | get { return (ILookupParameter<DoubleValue>)Parameters["PersonalBestAttraction"]; }
|
---|
67 | }
|
---|
68 | public ILookupParameter<DoubleValue> NeighborBestAttractionParameter {
|
---|
69 | get { return (ILookupParameter<DoubleValue>)Parameters["NeighborBestAttraction"]; }
|
---|
70 | }
|
---|
71 | #endregion
|
---|
72 |
|
---|
73 | #region Construction & Cloning
|
---|
74 | [StorableConstructor]
|
---|
75 | protected RealVectorParticleUpdater(bool deserializing) : base(deserializing) { }
|
---|
76 | protected RealVectorParticleUpdater(RealVectorParticleUpdater original, Cloner cloner) : base(original, cloner) { }
|
---|
77 | public RealVectorParticleUpdater()
|
---|
78 | : base() {
|
---|
79 | Parameters.Add(new LookupParameter<IRandom>("Random", "Random number generator."));
|
---|
80 | Parameters.Add(new LookupParameter<RealVector>("RealVector", "Particle's current solution"));
|
---|
81 | Parameters.Add(new LookupParameter<RealVector>("Velocity", "Particle's current velocity."));
|
---|
82 | Parameters.Add(new LookupParameter<RealVector>("PersonalBest", "Particle's personal best solution."));
|
---|
83 | Parameters.Add(new LookupParameter<RealVector>("NeighborBest", "Best neighboring solution."));
|
---|
84 | Parameters.Add(new LookupParameter<DoubleMatrix>("Bounds", "The lower and upper bounds for each dimension of the position vector for the current problem."));
|
---|
85 | Parameters.Add(new LookupParameter<DoubleValue>("CurrentMaxVelocity", "Maximum for the particle's velocity vector."));
|
---|
86 | Parameters.Add(new LookupParameter<DoubleValue>("CurrentInertia", "The weight for the particle's velocity vector."));
|
---|
87 | Parameters.Add(new LookupParameter<DoubleValue>("PersonalBestAttraction", "The weight for the particle's personal best position."));
|
---|
88 | Parameters.Add(new LookupParameter<DoubleValue>("NeighborBestAttraction", "The weight for the global best position."));
|
---|
89 | }
|
---|
90 | #endregion
|
---|
91 |
|
---|
92 | protected void UpdateVelocity() {
|
---|
93 | var velocity = VelocityParameter.ActualValue;
|
---|
94 | var position = RealVectorParameter.ActualValue;
|
---|
95 | var inertia = InertiaParameter.ActualValue.Value;
|
---|
96 | var personalBest = PersonalBestParameter.ActualValue;
|
---|
97 | var personalBestAttraction = PersonalBestAttractionParameter.ActualValue.Value;
|
---|
98 | var neighborBest = NeighborBestParameter.ActualValue;
|
---|
99 | var neighborBestAttraction = NeighborBestAttractionParameter.ActualValue.Value;
|
---|
100 |
|
---|
101 | var random = RandomParameter.ActualValue;
|
---|
102 |
|
---|
103 | for (int i = 0; i < velocity.Length; i++) {
|
---|
104 | double r_p = random.NextDouble();
|
---|
105 | double r_g = random.NextDouble();
|
---|
106 | velocity[i] =
|
---|
107 | velocity[i] * inertia +
|
---|
108 | (personalBest[i] - position[i]) * personalBestAttraction * r_p +
|
---|
109 | (neighborBest[i] - position[i]) * neighborBestAttraction * r_g;
|
---|
110 | }
|
---|
111 |
|
---|
112 | var maxVelocity = CurrentMaxVelocityParameter.ActualValue.Value;
|
---|
113 | var speed = Math.Sqrt(velocity.DotProduct(velocity));
|
---|
114 | if (speed > maxVelocity) {
|
---|
115 | for (var i = 0; i < velocity.Length; i++) {
|
---|
116 | velocity[i] *= maxVelocity / speed;
|
---|
117 | }
|
---|
118 | }
|
---|
119 | }
|
---|
120 |
|
---|
121 | protected void UpdatePosition() {
|
---|
122 | var velocity = VelocityParameter.ActualValue;
|
---|
123 | var position = RealVectorParameter.ActualValue;
|
---|
124 |
|
---|
125 | for (int i = 0; i < velocity.Length; i++) {
|
---|
126 | position[i] += velocity[i];
|
---|
127 | }
|
---|
128 |
|
---|
129 | var bounds = BoundsParameter.ActualValue;
|
---|
130 | for (int i = 0; i < position.Length; i++) {
|
---|
131 | double min = bounds[i % bounds.Rows, 0];
|
---|
132 | double max = bounds[i % bounds.Rows, 1];
|
---|
133 | if (position[i] < min) {
|
---|
134 | position[i] = min;
|
---|
135 | velocity[i] = -0.5 * velocity[i]; // SPSO 2011
|
---|
136 | }
|
---|
137 | if (position[i] > max) {
|
---|
138 | position[i] = max;
|
---|
139 | velocity[i] = -0.5 * velocity[i]; // SPSO 2011
|
---|
140 | }
|
---|
141 | }
|
---|
142 | }
|
---|
143 | }
|
---|
144 | }
|
---|