Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/fixings/Fitting.java @ 3011:ab81ffd1343e
FixA: Reactivated rewrite of the outlier checks.
flys-artifacts/trunk@4576 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 04 Jun 2012 16:44:56 +0000 |
parents | |
children | 705d2058b682 |
rev | line source |
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3011
ab81ffd1343e
FixA: Reactivated rewrite of the outlier checks.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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1 package de.intevation.flys.artifacts.model.fixings; |
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2 |
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3 import de.intevation.flys.artifacts.math.fitting.Function; |
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4 |
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5 import de.intevation.flys.artifacts.math.Outlier; |
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6 |
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7 import de.intevation.flys.artifacts.math.Outlier.IndexedValue; |
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8 import de.intevation.flys.artifacts.math.Outlier.Outliers; |
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9 |
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10 import org.apache.commons.math.MathException; |
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11 |
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12 import org.apache.commons.math.optimization.fitting.CurveFitter; |
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13 |
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14 import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer; |
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15 |
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16 import gnu.trove.TDoubleArrayList; |
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17 |
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18 import org.apache.log4j.Logger; |
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19 |
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20 import java.util.ArrayList; |
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21 import java.util.List; |
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22 |
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23 public class Fitting |
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24 { |
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25 private static Logger log = Logger.getLogger(Fitting.class); |
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26 |
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27 /** Use instance of this factory to find meta infos for outliers. */ |
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28 public interface QWFactory { |
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29 |
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30 QW create(double q, double w); |
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31 |
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32 } // interface QWFactory |
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33 |
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34 protected Function function; |
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35 protected QWFactory qwFactory; |
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36 protected double chiSqr; |
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37 protected double [] parameters; |
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38 protected ArrayList<QW> removed; |
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39 |
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40 |
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41 public Fitting() { |
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42 removed = new ArrayList<QW>(); |
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43 } |
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44 |
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45 public Fitting(Function function) { |
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46 this(); |
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47 this.function = function; |
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48 } |
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49 |
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50 public Fitting(Function function, QWFactory qwFactory) { |
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51 this(function); |
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52 this.qwFactory = qwFactory; |
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53 } |
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54 |
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55 public Function getFunction() { |
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56 return function; |
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57 } |
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58 |
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59 public void setFunction(Function function) { |
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60 this.function = function; |
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61 } |
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62 |
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63 public double getChiSquare() { |
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64 return chiSqr; |
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65 } |
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66 |
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67 public void reset() { |
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68 chiSqr = 0.0; |
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69 parameters = null; |
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70 removed.clear(); |
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71 } |
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72 |
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73 public boolean hasOutliers() { |
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74 return !removed.isEmpty(); |
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75 } |
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76 |
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77 public List<QW> getOutliers() { |
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78 return removed; |
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79 } |
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80 |
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81 public QW [] outliersToArray() { |
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82 return removed.toArray(new QW[removed.size()]); |
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83 } |
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84 |
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85 public double [] getParameters() { |
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86 return parameters; |
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87 } |
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88 |
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89 public boolean fit(double [] qs, double [] ws) { |
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90 |
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91 TDoubleArrayList xs = new TDoubleArrayList(qs.length); |
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92 TDoubleArrayList ys = new TDoubleArrayList(ws.length); |
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93 |
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94 for (int i = 0; i < qs.length; ++i) { |
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95 if (!Double.isNaN(qs[i]) && !Double.isNaN(ws[i])) { |
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96 xs.add(qs[i]); |
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97 ys.add(ws[i]); |
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98 } |
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99 else { |
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100 log.warn("remove invalid value " + qs[i] + " " + ws[i]); |
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101 } |
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102 } |
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103 |
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104 if (xs.size() < 2) { |
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105 return false; |
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106 } |
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107 |
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108 LevenbergMarquardtOptimizer lmo = new LevenbergMarquardtOptimizer(); |
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109 |
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110 double [] parameters; |
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111 |
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112 List<IndexedValue> inputs = new ArrayList<IndexedValue>(xs.size()); |
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113 |
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114 for (;;) { |
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115 CurveFitter cf = new CurveFitter(lmo); |
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116 |
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117 for (int i = 0, N = xs.size(); i < N; ++i) { |
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118 cf.addObservedPoint(xs.getQuick(i), ys.getQuick(i)); |
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119 } |
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120 |
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FixA: Reactivated rewrite of the outlier checks.
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121 try { |
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122 parameters = cf.fit(function, function.getInitialGuess()); |
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123 } |
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124 catch (MathException me) { |
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125 log.warn(me); |
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126 return false; |
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127 } |
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128 |
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129 if (qwFactory == null) { |
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130 break; |
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131 } |
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132 |
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133 inputs.clear(); |
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134 |
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135 // This is the paraterized function for a given km. |
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136 de.intevation.flys.artifacts.math.Function instance = |
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137 function.instantiate(parameters); |
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138 |
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139 for (int i = 0, N = xs.size(); i < N; ++i) { |
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140 double y = instance.value(xs.getQuick(i)); |
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141 if (Double.isNaN(y)) { |
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142 continue; |
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143 } |
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144 inputs.add(new IndexedValue(i, ys.getQuick(i) - y)); |
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145 } |
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146 |
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147 Outliers outliers = Outlier.findOutliers(inputs); |
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148 |
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FixA: Reactivated rewrite of the outlier checks.
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149 if (!outliers.hasOutliers()) { |
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150 break; |
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151 } |
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152 |
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FixA: Reactivated rewrite of the outlier checks.
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153 List<IndexedValue> rem = outliers.getRemoved(); |
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154 |
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FixA: Reactivated rewrite of the outlier checks.
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155 for (int i = rem.size()-1; i >= 0; --i) { |
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156 int idx = rem.get(i).getIndex(); |
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157 removed.add( |
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158 qwFactory.create( |
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159 xs.getQuick(idx), ys.getQuick(idx))); |
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160 xs.remove(idx); |
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161 ys.remove(idx); |
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162 } |
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163 } |
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164 |
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FixA: Reactivated rewrite of the outlier checks.
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165 chiSqr = lmo.getChiSquare(); |
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166 |
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167 return true; |
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168 } |
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169 } |
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170 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |