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source: branches/HeuristicLab.EvolutionaryTracking/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Manipulators/OnePointShaker.cs @ 13187

Last change on this file since 13187 was 9834, checked in by bburlacu, 11 years ago

#1772: Manually merged HeuristicLab.Encodings.SymbolicExpressionTreeEncoding project from the trunk to the branch.

File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2013 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.Collections.Generic;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
30  [StorableClass]
31  [Item("OnePointShaker", "Selects a random node with local parameters and manipulates the selected node.")]
32  public sealed class OnePointShaker : TracingSymbolicExpressionTreeManipulator {
33    private const string ShakingFactorParameterName = "ShakingFactor";
34    #region parameter properties
35    public IValueParameter<DoubleValue> ShakingFactorParameter {
36      get { return (IValueParameter<DoubleValue>)Parameters[ShakingFactorParameterName]; }
37    }
38    #endregion
39    #region properties
40    public double ShakingFactor {
41      get { return ShakingFactorParameter.Value.Value; }
42      set { ShakingFactorParameter.Value.Value = value; }
43    }
44    #endregion
45    [StorableConstructor]
46    private OnePointShaker(bool deserializing) : base(deserializing) { }
47    private OnePointShaker(OnePointShaker original, Cloner cloner) : base(original, cloner) { }
48    public OnePointShaker()
49      : base() {
50      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)));
51    }
52
53    public override IDeepCloneable Clone(Cloner cloner) {
54      return new OnePointShaker(this, cloner);
55    }
56
57    protected override void Manipulate(IRandom random, ISymbolicExpressionTree tree) {
58      OnePointShaker.Shake(random, tree, ShakingFactor);
59    }
60
61    public static void Shake(IRandom random, ISymbolicExpressionTree tree, double shakingFactor) {
62      List<ISymbolicExpressionTreeNode> parametricNodes = new List<ISymbolicExpressionTreeNode>();
63      tree.Root.ForEachNodePostfix(n => {
64        if (n.HasLocalParameters) parametricNodes.Add(n);
65      });
66      if (parametricNodes.Count > 0) {
67        var selectedPoint = parametricNodes.SelectRandom(random);
68        selectedPoint.ShakeLocalParameters(random, shakingFactor);
69      }
70    }
71  }
72}
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