Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Outlier.java @ 3552:1df6984628c3
S/Q: Extented the result data model of the S/Q calculation to
store the curve coefficients for each iteration step
of the outlier elimination.
flys-artifacts/trunk@5146 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 27 Jul 2012 12:36:09 +0000 |
parents | 49fe2ed03c12 |
children | 8d0f06b76e09 |
rev | line source |
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1 package de.intevation.flys.artifacts.model.sq; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.Iterator; |
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5 import java.util.List; |
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6 |
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7 import org.apache.commons.math.MathException; |
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8 |
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9 import org.apache.commons.math.stat.descriptive.moment.StandardDeviation; |
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10 |
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11 import org.apache.log4j.Logger; |
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12 |
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13 public class Outlier |
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14 { |
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15 private static Logger log = Logger.getLogger(Outlier.class); |
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16 |
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17 public static final int MAX_ITERATIONS = 1000; |
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18 |
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19 public interface Callback { |
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20 |
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21 void initialize(Iterator<SQ> good) throws MathException; |
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22 |
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23 double eval(SQ sq); |
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24 |
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25 void outlier(SQ sq); |
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26 |
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27 void remaining(SQ sq); |
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28 |
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29 void standardDeviation(double stdDev); |
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30 |
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31 void iterationFinished(); |
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32 |
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33 } // interface Callback |
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34 |
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35 private static final class EvalSQ { |
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36 protected SQ sq; |
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37 protected double value; |
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38 |
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39 public EvalSQ(SQ sq) { |
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40 this.sq = sq; |
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41 } |
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42 } // class EvalSQ |
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43 |
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44 public static void detectOutliers( |
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45 Callback callback, |
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46 List<SQ> sqs, |
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47 double stdDevFactor |
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48 ) |
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49 throws MathException |
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50 { |
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51 boolean debug = log.isDebugEnabled(); |
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52 |
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53 if (debug) { |
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54 log.debug("stdDevFactor: " + stdDevFactor); |
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55 } |
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56 |
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57 List<EvalSQ> data = new ArrayList<EvalSQ>(sqs.size()); |
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58 |
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59 for (SQ sq: sqs) { |
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60 data.add(new EvalSQ(sq)); |
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61 } |
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62 |
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63 List<EvalSQ> good = new ArrayList<EvalSQ>(sqs.size()); |
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64 |
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65 for (int i = 0; i < MAX_ITERATIONS && data.size() > 2; ++i) { |
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66 |
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67 callback.initialize(asSQIterator(data)); |
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68 |
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69 StandardDeviation stdDev = new StandardDeviation(); |
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70 |
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71 for (EvalSQ esq: data) { |
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72 stdDev.increment(esq.value = callback.eval(esq.sq)); |
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73 } |
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74 |
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75 double sd = stdDev.getResult(); |
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76 |
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77 callback.standardDeviation(sd); |
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78 |
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79 double accepted = stdDevFactor * sd; |
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80 |
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81 if (debug) { |
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82 log.debug("accepted: " + accepted); |
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83 } |
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84 |
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85 for (EvalSQ esq: data) { |
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86 if (debug) { |
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87 log.debug(" value: " + Math.abs(esq.value)); |
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88 } |
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89 |
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90 if (Math.abs(esq.value) > accepted) { |
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91 callback.outlier(esq.sq); |
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92 } |
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93 else { |
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94 callback.remaining(esq.sq); |
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95 good.add(esq); |
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96 } |
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97 } |
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98 |
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99 callback.iterationFinished(); |
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100 |
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101 if (good.size() == data.size()) { |
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102 break; |
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103 } |
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104 |
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105 List<EvalSQ> tmp = good; |
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106 good = data; |
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107 data = tmp; |
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108 good.clear(); |
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109 } |
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110 } |
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111 |
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112 protected static Iterator<SQ> asSQIterator(List<EvalSQ> esqs) { |
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113 final Iterator<EvalSQ> parent = esqs.iterator(); |
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114 return new Iterator<SQ>() { |
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115 @Override |
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116 public boolean hasNext() { |
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117 return parent.hasNext(); |
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118 } |
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119 |
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120 @Override |
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121 public SQ next() { |
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122 return parent.next().sq; |
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123 } |
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124 |
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125 @Override |
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126 public void remove() { |
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127 throw new UnsupportedOperationException(); |
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128 } |
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129 }; |
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130 } |
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131 } |
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132 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |