Last change
on this file since 5656 was
5275,
checked in by gkronber, 14 years ago
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Merged changes from trunk to data analysis exploration branch and added fractional distance metric evaluator. #1142
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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.Linq;
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4 | using System.Text;
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5 | using HeuristicLab.Core;
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6 | using HeuristicLab.Data;
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7 | using HeuristicLab.Problems.DataAnalysis.Evaluators;
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8 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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9 | using HeuristicLab.Parameters;
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10 |
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11 | namespace HeuristicLab.Problems.DataAnalysis.MultiVariate.Evaluators {
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12 | public class OnlineMeanFractionalDistanceEvaluator : IMultiVariateOnlineEvaluator {
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13 | private OnlineMeanAndVarianceCalculator meanEvaluator;
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14 | private readonly double d;
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15 | public OnlineMeanFractionalDistanceEvaluator(double d) {
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16 | this.d = d;
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17 | meanEvaluator = new OnlineMeanAndVarianceCalculator();
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18 | Reset();
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19 | }
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20 |
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21 | public double MeanFractionalDistance {
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22 | get { return meanEvaluator.Mean ; }
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23 | }
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24 |
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25 | #region IMultiVariateOnlineEvaluator Members
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26 | public double Value {
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27 | get { return MeanFractionalDistance; }
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28 | }
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29 |
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30 | public void Add(IEnumerable<double> original, IEnumerable<double> estimated) {
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31 | var originalEnumerator = original.GetEnumerator();
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32 | var estimatedEnumerator = estimated.GetEnumerator();
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33 | double sum = 0.0;
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34 | while (originalEnumerator.MoveNext() & estimatedEnumerator.MoveNext()) {
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35 | sum += Math.Pow(Math.Abs(originalEnumerator.Current - estimatedEnumerator.Current), 1.0 / d);
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36 | }
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37 | if (originalEnumerator.MoveNext() | estimatedEnumerator.MoveNext()) {
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38 | throw new ArgumentException("Number of elements in original and estimated does not match.");
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39 | }
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40 | double fracDist = Math.Pow(sum, d);
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41 | meanEvaluator.Add(fracDist);
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42 | }
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43 |
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44 | public void Reset() {
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45 | meanEvaluator.Reset();
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46 | }
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47 |
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48 | #endregion
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49 | }
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50 | }
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