[645] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[11208] | 3 | * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[645] | 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.Linq;
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[4722] | 23 | using HeuristicLab.Common;
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[645] | 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Data;
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[3512] | 26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[5499] | 27 | using HeuristicLab.Parameters;
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[5510] | 28 | using System.Collections.Generic;
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[645] | 29 |
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[5499] | 30 | namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
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[3512] | 31 | [StorableClass]
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| 32 | [Item("OnePointShaker", "Selects a random node with local parameters and manipulates the selected node.")]
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[4722] | 33 | public sealed class OnePointShaker : SymbolicExpressionTreeManipulator {
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[5499] | 34 | private const string ShakingFactorParameterName = "ShakingFactor";
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| 35 | #region parameter properties
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[6439] | 36 | public IValueParameter<DoubleValue> ShakingFactorParameter {
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| 37 | get { return (IValueParameter<DoubleValue>)Parameters[ShakingFactorParameterName]; }
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[5499] | 38 | }
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| 39 | #endregion
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| 40 | #region properties
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[6439] | 41 | public double ShakingFactor {
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| 42 | get { return ShakingFactorParameter.Value.Value; }
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| 43 | set { ShakingFactorParameter.Value.Value = value; }
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[5499] | 44 | }
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| 45 | #endregion
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[4722] | 46 | [StorableConstructor]
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| 47 | private OnePointShaker(bool deserializing) : base(deserializing) { }
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| 48 | private OnePointShaker(OnePointShaker original, Cloner cloner) : base(original, cloner) { }
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[5499] | 49 | public OnePointShaker()
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| 50 | : base() {
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[6439] | 51 | Parameters.Add(new FixedValueParameter<DoubleValue>(ShakingFactorParameterName, "The shaking factor that should be used for the manipulation of constants (default=1.0).", new DoubleValue(1.0)));
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[5499] | 52 | }
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[645] | 53 |
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[4722] | 54 | public override IDeepCloneable Clone(Cloner cloner) {
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| 55 | return new OnePointShaker(this, cloner);
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[645] | 56 | }
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| 57 |
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[5510] | 58 | protected override void Manipulate(IRandom random, ISymbolicExpressionTree tree) {
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[7972] | 59 | OnePointShaker.Shake(random, tree, ShakingFactor);
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| 60 | }
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| 61 |
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| 62 | public static void Shake(IRandom random, ISymbolicExpressionTree tree, double shakingFactor) {
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[5510] | 63 | List<ISymbolicExpressionTreeNode> parametricNodes = new List<ISymbolicExpressionTreeNode>();
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| 64 | tree.Root.ForEachNodePostfix(n => {
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| 65 | if (n.HasLocalParameters) parametricNodes.Add(n);
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| 66 | });
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| 67 | if (parametricNodes.Count > 0) {
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[5499] | 68 | var selectedPoint = parametricNodes.SelectRandom(random);
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[7972] | 69 | selectedPoint.ShakeLocalParameters(random, shakingFactor);
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[3535] | 70 | }
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[645] | 71 | }
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| 72 | }
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| 73 | }
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