[9334] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2012 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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[9392] | 22 | using System.Collections.Generic;
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| 23 | using System.Linq;
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[9334] | 24 | using HeuristicLab.Common;
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| 25 | using HeuristicLab.Core;
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| 26 | using HeuristicLab.Data;
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[9392] | 27 | using HeuristicLab.Operators;
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| 28 | using HeuristicLab.Optimization;
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| 29 | using HeuristicLab.Optimization.Operators.LCS;
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[9334] | 30 | using HeuristicLab.Parameters;
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| 31 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 32 |
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| 33 | namespace HeuristicLab.Encodings.DecisionList {
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| 34 | [Item("MDLEvaluator", "Description missing")]
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| 35 | [StorableClass]
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[9392] | 36 | public class MDLEvaluator : SingleSuccessorOperator, IDecisionListEvaluator, IDecisionListOperator, IMDLCalculatorBasedOperator, IIterationBasedOperator, IStochasticOperator {
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[9334] | 37 |
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[9392] | 38 | #region Parameter Properties
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| 39 | public ILookupParameter<IRandom> RandomParameter {
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| 40 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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[9334] | 41 | }
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[9392] | 42 | public ILookupParameter<DecisionList> DecisionListParameter {
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| 43 | get { return (ILookupParameter<DecisionList>)Parameters["DecisionList"]; }
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| 44 | }
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| 45 | public IValueLookupParameter<IntValue> SizePenaltyMinRulesParameter {
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| 46 | get { return (IValueLookupParameter<IntValue>)Parameters["SizePenaltyMinRules"]; }
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| 47 | }
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| 48 | public ILookupParameter<DoubleValue> QualityParameter {
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| 49 | get { return (ILookupParameter<DoubleValue>)Parameters["Quality"]; }
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| 50 | }
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| 51 | public IValueLookupParameter<IDecisionListClassificationProblemData> ProblemDataParameter {
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| 52 | get { return (IValueLookupParameter<IDecisionListClassificationProblemData>)Parameters["ProblemData"]; }
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| 53 | }
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[9334] | 54 |
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[9392] | 55 | public ILookupParameter<MDLCalculator> MDLCalculatorParameter {
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| 56 | get { return (ILookupParameter<MDLCalculator>)Parameters["MDLCalculator"]; }
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| 57 | }
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| 58 | public ILookupParameter<IntValue> IterationsParameter {
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| 59 | get { return (ILookupParameter<IntValue>)Parameters["Iterations"]; }
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| 60 | }
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| 61 | public IValueLookupParameter<IntValue> MaximumIterationsParameter {
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| 62 | get { return (IValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 63 | }
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| 64 |
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| 65 | public IValueLookupParameter<IntValue> IterationRuleDeletionParameter {
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| 66 | get { return (IValueLookupParameter<IntValue>)Parameters["IterationRuleDeletion"]; }
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| 67 | }
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| 68 | public IValueLookupParameter<IntValue> RuleDeletionMinRulesParameter {
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| 69 | get { return (IValueLookupParameter<IntValue>)Parameters["RuleDeletionMinRules"]; }
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| 70 | }
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| 71 |
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| 72 | public ILookupParameter<ItemList<ItemList<IntValue>>> StrataParameter {
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| 73 | get { return (ILookupParameter<ItemList<ItemList<IntValue>>>)Parameters["Strata"]; }
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| 74 | }
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| 75 | #endregion
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| 76 |
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| 77 | public IRandom Random {
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| 78 | get { return RandomParameter.ActualValue; }
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| 79 | }
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| 80 |
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[9334] | 81 | [StorableConstructor]
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| 82 | protected MDLEvaluator(bool deserializing) : base(deserializing) { }
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| 83 | protected MDLEvaluator(MDLEvaluator original, Cloner cloner)
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| 84 | : base(original, cloner) {
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| 85 | }
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| 86 | public MDLEvaluator()
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| 87 | : base() {
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[9392] | 88 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random generator to use."));
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| 89 | Parameters.Add(new LookupParameter<DecisionList>("DecisionList", ""));
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| 90 | Parameters.Add(new ValueLookupParameter<IntValue>("SizePenaltyMinRules", ""));
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| 91 | Parameters.Add(new LookupParameter<DoubleValue>("Quality", ""));
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| 92 | Parameters.Add(new ValueLookupParameter<IDecisionListClassificationProblemData>("ProblemData", ""));
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| 93 | Parameters.Add(new LookupParameter<MDLCalculator>("MDLCalculator", ""));
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| 94 | Parameters.Add(new LookupParameter<IntValue>("Iterations", ""));
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| 95 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", ""));
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| 96 | Parameters.Add(new ValueLookupParameter<IntValue>("IterationRuleDeletion", "", new IntValue(5)));
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| 97 | Parameters.Add(new ValueLookupParameter<IntValue>("RuleDeletionMinRules", "", new IntValue(12)));
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| 98 | Parameters.Add(new ValueLookupParameter<ItemList<ItemList<IntValue>>>("Strata", ""));
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[9334] | 99 | }
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| 100 | public override IDeepCloneable Clone(Cloner cloner) {
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| 101 | return new MDLEvaluator(this, cloner);
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| 102 | }
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| 103 |
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| 104 | public override IOperation Apply() {
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| 105 | double penalty = 1;
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| 106 |
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[9392] | 107 | var strata = StrataParameter.ActualValue;
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| 108 | int iteration = IterationsParameter.ActualValue.Value;
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| 109 | int numberOfStrata = strata.Count;
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| 110 | var dl = DecisionListParameter.ActualValue;
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| 111 | var problemData = ProblemDataParameter.ActualValue;
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| 112 | bool lastIteration = iteration == MaximumIterationsParameter.ActualValue.Value - 1;
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| 113 | IEnumerable<int> rows;
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| 114 | if (lastIteration) {
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| 115 | rows = from s in strata
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| 116 | from row in s
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| 117 | select row.Value;
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| 118 | } else {
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| 119 | rows = strata[iteration % numberOfStrata].Select(x => x.Value);
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| 120 | }
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| 121 | var input = problemData.FetchInput(rows);
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| 122 | var actions = problemData.FetchAction(rows);
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| 123 | ItemSet<Rule> aliveRules;
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| 124 | double theoryLength;
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| 125 | var estimated = dl.Evaluate(input, out aliveRules, out theoryLength);
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[9334] | 126 |
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[9392] | 127 | if (aliveRules.Count < SizePenaltyMinRulesParameter.ActualValue.Value) {
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| 128 | penalty = (1 - 0.025 * (SizePenaltyMinRulesParameter.ActualValue.Value - aliveRules.Count));
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[9334] | 129 | if (penalty <= 0) penalty = 0.01;
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| 130 | penalty *= penalty;
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| 131 | }
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| 132 |
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[9392] | 133 | double accuracy = DecisionListSolution.CalculateAccuracy(actions, estimated);
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| 134 | QualityParameter.ActualValue = new DoubleValue(MDLCalculatorParameter.ActualValue.CalculateFitness(theoryLength, accuracy) / penalty);
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| 135 |
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| 136 | if (iteration >= IterationRuleDeletionParameter.ActualValue.Value) {
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| 137 | if (lastIteration) {
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| 138 | DoRuleDeletion(dl, aliveRules, 1);
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| 139 | } else {
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| 140 | DoRuleDeletion(dl, aliveRules, RuleDeletionMinRulesParameter.ActualValue.Value);
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| 141 | }
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| 142 | }
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[9334] | 143 | return base.Apply();
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| 144 | }
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[9392] | 145 |
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| 146 | // default rule cannot be deleted, but it has to be considered in the rule set size
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[9475] | 147 | private void DoRuleDeletion(DecisionList dl, IEnumerable<Rule> aliveRules, int minRules) {
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[9392] | 148 | int ruleSetSize = dl.RuleSetSize;
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| 149 | if (ruleSetSize <= minRules) { return; }
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| 150 |
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| 151 | var deadRules = dl.Rules.Except(aliveRules).ToList();
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| 152 | int numberOfDeadRules = deadRules.Count();
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| 153 |
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| 154 | int keepRules = minRules - (ruleSetSize - numberOfDeadRules);
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| 155 |
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| 156 | if (keepRules > 0) {
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| 157 | for (int i = 0; i < keepRules; i++) {
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| 158 | int pos = Random.Next(deadRules.Count);
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| 159 | deadRules.RemoveAt(pos);
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| 160 | }
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| 161 | }
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| 162 |
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| 163 | dl.RemoveRules(deadRules);
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| 164 | }
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[9334] | 165 | }
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| 166 | } |
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