Last change
on this file since 44 was
44,
checked in by gkronber, 16 years ago
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added operator MultiHeuristicBranch
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File size:
1.7 KB
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1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Text;
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4 | using HeuristicLab.Core;
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5 | using HeuristicLab.Data;
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6 |
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7 | namespace HeuristicLab.Operators {
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8 | public class MultiHeuristicBranch: OperatorBase {
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9 | public MultiHeuristicBranch()
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10 | : base() {
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11 |
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12 | AddVariableInfo(new VariableInfo("Probabilities", "The probabilities, that define how likely each suboperator/graph is executed. This array must sum to 1", typeof(DoubleArrayData), VariableKind.In));
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13 | AddVariableInfo(new VariableInfo("Random", "The pseudo random-generator, used for any random-decision.", typeof(IRandom), VariableKind.In));
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14 | }
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15 |
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16 | public override IOperation Apply(IScope scope) {
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17 | IRandom random = GetVariableValue<IRandom>("Random", scope, true);
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18 | DoubleArrayData probabilities = GetVariableValue<DoubleArrayData>("Probabilities", scope, true);
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19 | if(probabilities.Data.Length != SubOperators.Count) {
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20 | throw new InvalidOperationException("MultiHeuristicBranch: The list of probabilities has to match the number of operators");
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21 | }
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22 | double sum = 0;
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23 | foreach(double prob in probabilities.Data) {
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24 | sum+=prob;
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25 | }
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26 | double r = random.NextDouble()*sum;
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27 | sum = 0;
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28 | IOperator successor = null;
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29 | for(int i = 0; i < SubOperators.Count; i++) {
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30 | sum += probabilities.Data[i];
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31 | if(sum > r) {
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32 | successor = SubOperators[i];
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33 | break;
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34 | }
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35 | }
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36 | if(successor == null) {
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37 | throw new InvalidOperationException("MultiHeuristicBranch: There was a problem with the list of probabilities");
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38 | }
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39 | return new AtomicOperation(successor, scope);
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40 | }
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41 | }
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42 | }
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