1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2019 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 HEAL.Attic;
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25 |
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26 | namespace HeuristicLab.Encodings.RealVectorEncoding {
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27 | [Item("Velocity Initializer (SPSO 2011)", "Initializes the velocity vector.")]
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28 | [StorableType("E844F8B9-068B-433D-8693-9416CA9140FB")]
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29 | public class SPSO2011VelocityInitializer : SPSOVelocityInitializer {
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30 |
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31 | #region Construction & Cloning
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32 | [StorableConstructor]
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33 | protected SPSO2011VelocityInitializer(StorableConstructorFlag _) : base(_) { }
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34 | protected SPSO2011VelocityInitializer(SPSO2011VelocityInitializer original, Cloner cloner) : base(original, cloner) { }
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35 | public SPSO2011VelocityInitializer() : base() { }
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36 | public override IDeepCloneable Clone(Cloner cloner) {
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37 | return new SPSO2011VelocityInitializer(this, cloner);
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38 | }
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39 | #endregion
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40 |
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41 | public override IOperation Apply() {
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42 | var random = RandomParameter.ActualValue;
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43 | var bounds = BoundsParameter.ActualValue;
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44 | var position = RealVectorParameter.ActualValue;
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45 | var velocity = new RealVector(position.Length);
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46 | for (var i = 0; i < velocity.Length; i++) {
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47 | var lower = (bounds[i % bounds.Rows, 0] - position[i]);
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48 | var upper = (bounds[i % bounds.Rows, 1] - position[i]);
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49 | velocity[i] = lower + random.NextDouble() * (upper - lower); // SPSO 2011
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50 | }
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51 | VelocityParameter.ActualValue = velocity;
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52 | return base.Apply();
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53 | }
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54 | }
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55 | }
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