1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2017 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 System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Text;
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26 | using System.Threading.Tasks;
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27 | using HeuristicLab.Common;
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28 | using HeuristicLab.Core;
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29 | using HeuristicLab.Data;
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30 | using HeuristicLab.Operators;
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31 | using HeuristicLab.Optimization;
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32 | using HeuristicLab.Parameters;
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33 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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34 |
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35 | namespace HeuristicLab.Encodings.RealVectorEncoding {
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36 | [Item("RealVectorVelocityInitializer", "Initializes the velocity vector.")]
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37 | [StorableClass]
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38 | public class RealVectorVelocityInitializer : SingleSuccessorOperator, IStochasticOperator {
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39 | #region Parameters
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40 | public ILookupParameter<IRandom> RandomParameter {
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41 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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42 | }
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43 | public IValueLookupParameter<DoubleMatrix> BoundsParameter {
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44 | get { return (IValueLookupParameter<DoubleMatrix>)Parameters["Bounds"]; }
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45 | }
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46 | public ILookupParameter<RealVector> RealVectorParameter {
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47 | get { return (ILookupParameter<RealVector>)Parameters["RealVector"]; }
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48 | }
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49 | public ILookupParameter<RealVector> VelocityParameter {
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50 | get { return (ILookupParameter<RealVector>)Parameters["Velocity"]; }
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51 | }
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52 | #endregion
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53 |
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54 | #region Construction & Cloning
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55 | [StorableConstructor]
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56 | protected RealVectorVelocityInitializer(bool deserializing) : base(deserializing) { }
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57 | protected RealVectorVelocityInitializer(RealVectorVelocityInitializer original, Cloner cloner) : base(original, cloner) { }
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58 | public RealVectorVelocityInitializer()
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59 | : base() {
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60 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
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61 | Parameters.Add(new ValueLookupParameter<DoubleMatrix>("Bounds", "The lower and upper bounds in each dimension."));
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62 | Parameters.Add(new LookupParameter<RealVector>("RealVector", "Particle's current solution"));
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63 | Parameters.Add(new LookupParameter<RealVector>("Velocity", "Particle's current velocity."));
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64 | }
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65 | public override IDeepCloneable Clone(Cloner cloner) {
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66 | return new RealVectorVelocityInitializer(this, cloner);
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67 | }
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68 | #endregion
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69 |
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70 | public override IOperation Apply() {
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71 | var random = RandomParameter.ActualValue;
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72 | var bounds = BoundsParameter.ActualValue;
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73 | var position = RealVectorParameter.ActualValue;
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74 | var velocity = new RealVector(position.Length);
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75 | for (var i = 0; i < velocity.Length; i++) {
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76 | var lower = (bounds[i % bounds.Rows, 0] - position[i]);
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77 | var upper = (bounds[i % bounds.Rows, 1] - position[i]);
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78 | velocity[i] = lower + random.NextDouble() * (upper - lower); // SPSO 2011
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79 | }
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80 | VelocityParameter.ActualValue = velocity;
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81 | return base.Apply();
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82 | }
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83 | }
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84 | }
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