[3223] | 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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[3269] | 22 | using System.Linq;
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[3223] | 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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[3239] | 36 | public abstract class SymbolicExpressionTreeCreator : SingleSuccessorOperator, ISolutionCreator, IStochasticOperator, ISymbolicExpressionTreeOperator {
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[3223] | 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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[3269] | 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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[3223] | 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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