1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 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.Linq;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Data;
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25 | using HeuristicLab.Operators;
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26 | using HeuristicLab.Optimization;
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27 | using HeuristicLab.Parameters;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 |
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30 | namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
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31 | /// <summary>
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32 | /// A base class for operators creating symbolic expression trees.
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33 | /// </summary>
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34 | [Item("SymbolicExpressionTreeCreator", "A base class for operators creating symbolic expression trees.")]
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35 | [StorableClass]
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36 | public abstract class SymbolicExpressionTreeCreator : SingleSuccessorOperator, ISolutionCreator, IStochasticOperator, ISymbolicExpressionTreeOperator {
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37 | private const string RandomParameterName = "Random";
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38 | private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
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39 | private const string MaxTreeSizeParameterName = "MaxTreeSize";
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40 | private const string MaxTreeHeightParameterName = "MaxTreeHeight";
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41 | private const string SymbolicExpressionGrammarParameterName = "SymbolicExpressionGrammar";
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42 |
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43 | public override bool CanChangeName {
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44 | get { return false; }
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45 | }
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46 |
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47 | public ILookupParameter<IRandom> RandomParameter {
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48 | get { return (LookupParameter<IRandom>)Parameters[RandomParameterName]; }
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49 | }
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50 | public ILookupParameter<SymbolicExpressionTree> SymbolicExpressionTreeParameter {
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51 | get { return (ILookupParameter<SymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }
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52 | }
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53 | public IValueLookupParameter<IntValue> MaxTreeSizeParameter {
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54 | get { return (IValueLookupParameter<IntValue>)Parameters[MaxTreeSizeParameterName]; }
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55 | }
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56 | public IValueLookupParameter<IntValue> MaxTreeHeightParameter {
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57 | get { return (IValueLookupParameter<IntValue>)Parameters[MaxTreeHeightParameterName]; }
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58 | }
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59 | public ILookupParameter<ISymbolicExpressionGrammar> SymbolicExpressionGrammarParameter {
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60 | get { return (ILookupParameter<ISymbolicExpressionGrammar>)Parameters[SymbolicExpressionGrammarParameterName]; }
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61 | }
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62 |
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63 | protected SymbolicExpressionTreeCreator()
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64 | : base() {
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65 | Parameters.Add(new LookupParameter<IRandom>(RandomParameterName, "The pseudo random number generator which should be used for stochastic solution creation operators."));
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66 | Parameters.Add(new LookupParameter<SymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression tree that should be initialized."));
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67 | Parameters.Add(new ValueLookupParameter<IntValue>(MaxTreeSizeParameterName, "The maximal size (number of nodes) of the symbolic expression tree that should be initialized."));
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68 | Parameters.Add(new ValueLookupParameter<IntValue>(MaxTreeHeightParameterName, "The maximal height of the symbolic expression tree that should be initialized (a tree with one node has height = 0)."));
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69 | Parameters.Add(new LookupParameter<ISymbolicExpressionGrammar>(SymbolicExpressionGrammarParameterName, "The grammar that defines the allowed symbols and syntax of the symbolic expression trees."));
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70 | }
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71 |
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72 | public sealed override IOperation Apply() {
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73 | SymbolicExpressionTreeParameter.ActualValue = Create(RandomParameter.ActualValue, SymbolicExpressionGrammarParameter.ActualValue,
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74 | MaxTreeSizeParameter.ActualValue, MaxTreeHeightParameter.ActualValue);
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75 |
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76 | foreach (var node in SymbolicExpressionTreeParameter.ActualValue.IterateNodesPostfix()) {
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77 | node.ResetLocalParameters(RandomParameter.ActualValue);
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78 | }
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79 | return null;
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80 | }
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81 |
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82 | protected abstract SymbolicExpressionTree Create(IRandom random, ISymbolicExpressionGrammar grammar, IntValue maxTreeSize, IntValue maxTreeHeight);
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83 | }
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84 | }
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