[10302] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[10464] | 3 | * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[10302] | 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 HeuristicLab.Data;
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| 25 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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| 26 | using HeuristicLab.Operators;
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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.Problems.DataAnalysis.Symbolic {
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| 31 | [StorableClass]
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| 32 | public class SymbolicDataAnalysisExpressionTreeSimilarityCalculator : SingleSuccessorOperator {
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| 33 | private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
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| 34 | private const string CurrentSymbolicExpressionTreeParameterName = "CurrentSymbolicExpressionTree";
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| 35 | private const string SimilarityValuesParmeterName = "Similarity";
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| 36 | // comparer parameters
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| 37 | private const string MatchVariablesParameterName = "MatchVariableNames";
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| 38 | private const string MatchVariableWeightsParameterName = "MatchVariableWeights";
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| 39 | private const string MatchConstantValuesParameterName = "MatchConstantValues";
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| 40 |
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[11197] | 41 | private IDistanceCalculator distanceCalculator;
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| 42 |
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[10302] | 43 | public IScopeTreeLookupParameter<ISymbolicExpressionTree> SymbolicExpressionTreeParameter {
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[10456] | 44 | get { return (IScopeTreeLookupParameter<ISymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }
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[10302] | 45 | }
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| 46 | public IValueParameter<ISymbolicExpressionTree> CurrentSymbolicExpressionTreeParameter {
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| 47 | get { return (IValueParameter<ISymbolicExpressionTree>)Parameters[CurrentSymbolicExpressionTreeParameterName]; }
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| 48 | }
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[11197] | 49 |
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[10302] | 50 | public ILookupParameter<DoubleValue> SimilarityParameter {
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| 51 | get { return (ILookupParameter<DoubleValue>)Parameters[SimilarityValuesParmeterName]; }
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| 52 | }
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| 53 | public ISymbolicExpressionTree CurrentSymbolicExpressionTree {
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| 54 | get { return CurrentSymbolicExpressionTreeParameter.Value; }
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| 55 | set { CurrentSymbolicExpressionTreeParameter.Value = value; }
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| 56 | }
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| 57 |
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| 58 | public int MaximumTreeDepth { get; set; }
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| 59 |
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| 60 | protected SymbolicDataAnalysisExpressionTreeSimilarityCalculator(
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| 61 | SymbolicDataAnalysisExpressionTreeSimilarityCalculator original, Cloner cloner)
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| 62 | : base(original, cloner) {
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| 63 | }
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| 64 |
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| 65 | public override IDeepCloneable Clone(Cloner cloner) {
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| 66 | return new SymbolicDataAnalysisExpressionTreeSimilarityCalculator(this, cloner);
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| 67 | }
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| 68 |
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| 69 | [StorableConstructor]
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| 70 | protected SymbolicDataAnalysisExpressionTreeSimilarityCalculator(bool deserializing)
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| 71 | : base(deserializing) {
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| 72 | }
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| 73 |
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[11197] | 74 | private SymbolicDataAnalysisExpressionTreeSimilarityCalculator() {
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| 75 | }
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| 76 |
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| 77 | public SymbolicDataAnalysisExpressionTreeSimilarityCalculator(IDistanceCalculator distanceCalculator)
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[10302] | 78 | : base() {
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[11197] | 79 | this.distanceCalculator = distanceCalculator;
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| 80 |
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[10456] | 81 | Parameters.Add(new ScopeTreeLookupParameter<ISymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression trees to analyze."));
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[10302] | 82 | Parameters.Add(new ValueParameter<ISymbolicExpressionTree>(CurrentSymbolicExpressionTreeParameterName, ""));
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[10456] | 83 | Parameters.Add(new LookupParameter<BoolValue>(MatchVariablesParameterName, "Specify if the symbolic expression tree comparer should match variable names."));
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[10650] | 84 | Parameters.Add(new LookupParameter<BoolValue>(MatchVariableWeightsParameterName, "Specify if the symbolic expression tree comparer should match variable weghts."));
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[10456] | 85 | Parameters.Add(new LookupParameter<BoolValue>(MatchConstantValuesParameterName, "Specify if the symbolic expression tree comparer should match constant values."));
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[10302] | 86 | Parameters.Add(new LookupParameter<DoubleValue>(SimilarityValuesParmeterName, ""));
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| 87 | }
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| 88 |
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| 89 | public override IOperation Apply() {
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| 90 | var trees = SymbolicExpressionTreeParameter.ActualValue;
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| 91 |
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| 92 | double similarity = 0.0;
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| 93 | var current = CurrentSymbolicExpressionTree;
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| 94 |
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| 95 | bool found = false;
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| 96 | foreach (var tree in trees) {
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| 97 | if (tree == current) {
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| 98 | found = true;
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| 99 | continue;
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| 100 | }
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| 101 |
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| 102 | if (found) {
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[11197] | 103 | var distance = distanceCalculator.CalculateDistance(current, tree);
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[11015] | 104 | similarity += 1 - distance;
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[10302] | 105 | }
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| 106 | }
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| 107 |
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| 108 | lock (SimilarityParameter.ActualValue) {
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| 109 | SimilarityParameter.ActualValue.Value += similarity;
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| 110 | }
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| 111 | return base.Apply();
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| 112 | }
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| 113 | }
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| 114 | }
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