Mercurial Hosting > traffic-intelligence
annotate python/utils.py @ 464:dcc821b98efc
integrated and reorganized Sohail s work on exact ttc computation
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Sun, 23 Feb 2014 23:18:08 -0500 |
parents | 825e5d49325d |
children | 30b3455978d9 |
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1 #! /usr/bin/env python |
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2 ''' Generic utilities.''' |
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3 |
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4 #from numpy import * |
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5 #from pylab import * |
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6 from datetime import time, datetime |
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7 |
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8 __metaclass__ = type |
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9 |
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10 commentChar = '#' |
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11 |
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12 delimiterChar = '%'; |
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13 |
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14 datetimeFormat = "%Y-%m-%d %H:%M:%S" |
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15 |
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16 ######################### |
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17 # Enumerations |
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18 ######################### |
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19 |
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20 def inverseEnumeration(l): |
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21 'Returns the dictionary that provides for each element in the input list its index in the input list' |
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22 result = {} |
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23 for i,x in enumerate(l): |
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24 result[x] = i |
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25 return result |
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26 |
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27 ######################### |
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28 # simple statistics |
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29 ######################### |
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30 |
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31 def sampleSize(stdev, tolerance, percentConfidence, printLatex = False): |
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32 from scipy.stats.distributions import norm |
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33 k = round(norm.ppf(0.5+percentConfidence/200., 0, 1)*100)/100. # 1.-(100-percentConfidence)/200. |
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34 if printLatex: |
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35 print('${0}^2\\frac{{{1}^2}}{{{2}^2}}$'.format(k, stdev, tolerance)) |
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36 return (k*stdev/tolerance)**2 |
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37 |
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38 def confidenceInterval(mean, stdev, nSamples, percentConfidence, trueStd = True, printLatex = False): |
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39 'if trueStd, use normal distribution, otherwise, Student' |
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40 from math import sqrt |
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41 from scipy.stats.distributions import norm, t |
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42 if trueStd: |
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43 k = round(norm.ppf(0.5+percentConfidence/200., 0, 1)*100)/100. # 1.-(100-percentConfidence)/200. |
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44 else: # use Student |
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45 k = round(t.ppf(0.5+percentConfidence/200., nSamples-1)*100)/100. |
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46 e = k*stdev/sqrt(nSamples) |
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47 if printLatex: |
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48 print('${0} \pm {1}\\frac{{{2}}}{{\sqrt{{{3}}}}}$'.format(mean, k, stdev, nSamples)) |
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49 return mean-e, mean+e |
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50 |
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51 def computeChi2(expected, observed): |
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52 '''Returns the Chi2 statistics''' |
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53 result = 0. |
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54 for e, o in zip(expected, observed): |
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55 result += ((e-o)*(e-o))/e |
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56 return result |
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57 |
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58 class EmpiricalDistribution: |
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59 def nSamples(self): |
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60 return sum(self.counts) |
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61 |
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62 def cumulativeDensityFunction(sample): |
276 | 63 '''Returns the cumulative density function of the sample of a random variable''' |
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64 from numpy.core.multiarray import array |
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65 from numpy.lib.function_base import unique |
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66 from numpy.core.fromnumeric import sum |
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67 a = array(sample) |
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68 a.sort() |
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69 xaxis = unique(a) |
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70 counts = [sum(a <= x) for x in xaxis] |
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71 return xaxis, counts |
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72 |
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73 class EmpiricalDiscreteDistribution(EmpiricalDistribution): |
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74 '''Class to represent a sample of a distribution for a discrete random variable |
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75 ''' |
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76 from numpy.core.fromnumeric import sum |
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77 |
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78 def __init__(self, categories, counts): |
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79 self.categories = categories |
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80 self.counts = counts |
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81 |
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82 def mean(self): |
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83 result = [float(x*y) for x,y in zip(self.categories, self.counts)] |
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84 return sum(result)/self.nSamples() |
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85 |
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86 def var(self, mean = None): |
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87 if not mean: |
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88 m = self.mean() |
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89 else: |
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90 m = mean |
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91 result = 0. |
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92 squares = [float((x-m)*(x-m)*y) for x,y in zip(self.categories, self.counts)] |
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93 return sum(squares)/(self.nSamples()-1) |
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94 |
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95 def referenceCounts(self, probability): |
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96 '''probability is a function that returns the probability of the random variable for the category values''' |
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97 refProba = [probability(c) for c in self.categories] |
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98 refProba[-1] = 1-sum(refProba[:-1]) |
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99 refCounts = [r*self.nSamples() for r in refProba] |
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100 return refCounts, refProba |
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101 |
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102 class EmpiricalContinuousDistribution(EmpiricalDistribution): |
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103 '''Class to represent a sample of a distribution for a continuous random variable |
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104 with the number of observations for each interval |
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105 intervals (categories variable) are defined by their left limits, the last one being the right limit |
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106 categories contain therefore one more element than the counts''' |
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107 def __init__(self, categories, counts): |
276 | 108 # todo add samples for initialization and everything to None? (or setSamples?) |
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109 self.categories = categories |
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110 self.counts = counts |
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111 |
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112 def mean(self): |
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113 result = 0. |
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114 for i in range(len(self.counts)-1): |
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115 result += self.counts[i]*(self.categories[i]+self.categories[i+1])/2 |
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116 return result/self.nSamples() |
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117 |
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118 def var(self, mean = None): |
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119 if not mean: |
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120 m = self.mean() |
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121 else: |
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122 m = mean |
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123 result = 0. |
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124 for i in range(len(self.counts)-1): |
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125 mid = (self.categories[i]+self.categories[i+1])/2 |
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126 result += self.counts[i]*(mid - m)*(mid - m) |
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127 return result/(self.nSamples()-1) |
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128 |
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129 def referenceCounts(self, cdf): |
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130 '''cdf is a cumulative distribution function |
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131 returning the probability of the variable being less that x''' |
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132 # refCumulativeCounts = [0]#[cdf(self.categories[0][0])] |
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133 # for inter in self.categories: |
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134 # refCumulativeCounts.append(cdf(inter[1])) |
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135 refCumulativeCounts = [cdf(x) for x in self.categories[1:-1]] |
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136 |
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137 refProba = [refCumulativeCounts[0]] |
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138 for i in xrange(1,len(refCumulativeCounts)): |
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139 refProba.append(refCumulativeCounts[i]-refCumulativeCounts[i-1]) |
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140 refProba.append(1-refCumulativeCounts[-1]) |
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141 refCounts = [p*self.nSamples() for p in refProba] |
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142 |
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143 return refCounts, refProba |
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144 |
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145 def printReferenceCounts(self, refCounts=None): |
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146 if refCounts: |
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147 ref = refCounts |
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148 else: |
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149 ref = self.referenceCounts |
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150 for i in xrange(len(ref[0])): |
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151 print('{0}-{1} & {2:0.3} & {3:0.3} \\\\'.format(self.categories[i],self.categories[i+1],ref[1][i], ref[0][i])) |
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152 |
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153 |
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154 ######################### |
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155 # maths section |
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156 ######################### |
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157 |
433
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158 # def kernelSmoothing(sampleX, X, Y, weightFunc, halfwidth): |
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159 # '''Returns a smoothed weighted version of Y at the predefined values of sampleX |
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160 # Sum_x weight(sample_x,x) * y(x)''' |
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161 # from numpy import zeros, array |
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162 # smoothed = zeros(len(sampleX)) |
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163 # for i,x in enumerate(sampleX): |
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164 # weights = array([weightFunc(x,xx, halfwidth) for xx in X]) |
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165 # if sum(weights)>0: |
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166 # smoothed[i] = sum(weights*Y)/sum(weights) |
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167 # else: |
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168 # smoothed[i] = 0 |
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169 # return smoothed |
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170 |
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171 def kernelSmoothing(x, X, Y, weightFunc, halfwidth): |
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172 '''Returns the smoothed estimate of (X,Y) at x |
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173 Sum_x weight(sample_x,x) * y(x)''' |
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174 from numpy import zeros, array |
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175 weights = array([weightFunc(x,observedx, halfwidth) for observedx in X]) |
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176 if sum(weights)>0: |
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177 return sum(weights*Y)/sum(weights) |
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178 else: |
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179 return 0 |
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180 |
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181 def uniform(center, x, halfwidth): |
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182 if abs(center-x)<halfwidth: |
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183 return 1. |
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184 else: |
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185 return 0. |
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186 |
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187 def gaussian(center, x, halfwidth): |
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188 from numpy import exp |
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189 return exp(-((center-x)/halfwidth)**2/2) |
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190 |
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191 def epanechnikov(center, x, halfwidth): |
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192 diff = abs(center-x) |
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193 if diff<halfwidth: |
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194 return 1.-(diff/halfwidth)**2 |
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195 else: |
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196 return 0. |
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197 |
434 | 198 def triangular(center, x, halfwidth): |
199 diff = abs(center-x) | |
200 if diff<halfwidth: | |
201 return 1.-abs(diff/halfwidth) | |
202 else: | |
203 return 0. | |
433
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204 |
370
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205 def argMaxDict(d): |
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206 return max(d.iterkeys(), key=(lambda key: d[key])) |
279
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207 |
395
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208 def framesToTime(nFrames, frameRate, initialTime = time()): |
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209 '''returns a datetime.time for the time in hour, minutes and seconds |
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210 initialTime is a datetime.time''' |
248
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211 from math import floor |
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212 seconds = int(floor(float(nFrames)/float(frameRate))+initialTime.hour*3600+initialTime.minute*60+initialTime.second) |
261
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213 h = int(floor(seconds/3600.)) |
248
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214 seconds = seconds - h*3600 |
261
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215 m = int(floor(seconds/60)) |
248
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216 seconds = seconds - m*60 |
262
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217 return time(h, m, seconds) |
248
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218 |
381
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219 def timeToFrames(t, frameRate): |
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220 return frameRate*(t.hour*3600+t.minute*60+t.second) |
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221 |
241
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222 def sortXY(X,Y): |
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223 'returns the sorted (x, Y(x)) sorted on X' |
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224 D = {} |
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225 for x, y in zip(X,Y): |
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226 D[x]=y |
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227 xsorted = sorted(D.keys()) |
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228 return xsorted, [D[x] for x in xsorted] |
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229 |
32 | 230 def ceilDecimals(v, nDecimals): |
231 '''Rounds the number at the nth decimal | |
232 eg 1.23 at 0 decimal is 2, at 1 decimal is 1.3''' | |
233 from math import ceil,pow | |
234 tens = pow(10,nDecimals) | |
235 return ceil(v*tens)/tens | |
236 | |
152
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237 def inBetween(bound1, bound2, x): |
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238 return bound1 <= x <= bound2 or bound2 <= x<= bound1 |
24
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239 |
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240 def crossProduct(l1, l2): |
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241 return l1[0]*l2[1]-l1[1]*l2[0] |
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242 |
29
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243 def filterMovingWindow(input, halfWidth): |
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244 '''Returns an array obtained after the smoothing of the input by a moving average |
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245 The first and last points are copied from the original.''' |
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246 width = float(halfWidth*2+1) |
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247 win = ones(width,'d') |
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248 result = convolve(win/width,array(inputSignal),'same') |
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249 result[:halfWidth] = inputSignal[:halfWidth] |
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250 result[-halfWidth:] = inputSignal[-halfWidth:] |
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251 return result |
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252 |
199
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253 def linearRegression(x, y, deg = 1, plotData = False): |
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254 '''returns the least square estimation of the linear regression of y = ax+b |
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255 as well as the plot''' |
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256 from numpy.lib.polynomial import polyfit |
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257 from matplotlib.pyplot import plot |
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258 from numpy.core.multiarray import arange |
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259 coef = polyfit(x, y, deg) |
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260 if plotData: |
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261 def poly(x): |
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262 result = 0 |
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263 for i in range(len(coef)): |
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264 result += coef[i]*x**(len(coef)-i-1) |
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265 return result |
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266 plot(x, y, 'x') |
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267 xx = arange(min(x), max(x),(max(x)-min(x))/1000) |
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268 plot(xx, [poly(z) for z in xx]) |
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269 return coef |
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270 |
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271 ######################### |
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272 # iterable section |
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273 ######################### |
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274 |
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275 def mostCommon(L): |
456 | 276 '''Returns the most frequent element in a iterable |
277 | |
278 taken from http://stackoverflow.com/questions/1518522/python-most-common-element-in-a-list''' | |
455
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279 from itertools import groupby |
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280 from operator import itemgetter |
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281 # get an iterable of (item, iterable) pairs |
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282 SL = sorted((x, i) for i, x in enumerate(L)) |
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283 # print 'SL:', SL |
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284 groups = groupby(SL, key=itemgetter(0)) |
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285 # auxiliary function to get "quality" for an item |
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286 def _auxfun(g): |
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287 item, iterable = g |
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288 count = 0 |
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289 min_index = len(L) |
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290 for _, where in iterable: |
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291 count += 1 |
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292 min_index = min(min_index, where) |
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293 # print 'item %r, count %r, minind %r' % (item, count, min_index) |
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294 return count, -min_index |
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295 # pick the highest-count/earliest item |
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296 return max(groups, key=_auxfun)[0] |
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297 |
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298 ######################### |
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299 # sequence section |
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300 ######################### |
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301 |
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302 class LCSS: |
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303 '''Class that keeps the LCSS parameters |
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304 and puts together the various computations''' |
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305 def __init__(self, similarityFunc, delta = float('inf'), aligned = False, lengthFunc = min): |
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306 self.similarityFunc = similarityFunc |
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307 self.aligned = aligned |
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308 self.delta = delta |
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309 self.lengthFunc = lengthFunc |
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310 self.subSequenceIndices = [(0,0)] |
370
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311 |
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312 def similarities(self, l1, l2, jshift=0): |
370
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313 from numpy import zeros, int as npint |
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314 n1 = len(l1) |
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315 n2 = len(l2) |
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316 self.similarityTable = zeros((n1+1,n2+1), dtype = npint) |
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317 for i in xrange(1,n1+1): |
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318 for j in xrange(max(1,i-jshift-self.delta),min(n2,i-jshift+self.delta)+1): |
370
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319 if self.similarityFunc(l1[i-1], l2[j-1]): |
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320 self.similarityTable[i,j] = self.similarityTable[i-1,j-1]+1 |
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321 else: |
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322 self.similarityTable[i,j] = max(self.similarityTable[i-1,j], self.similarityTable[i,j-1]) |
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323 |
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324 def subSequence(self, i, j): |
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325 '''Returns the subsequence of two sequences |
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326 http://en.wikipedia.org/wiki/Longest_common_subsequence_problem''' |
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327 if i == 0 or j == 0: |
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328 return [] |
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329 elif self.similarityTable[i][j] == self.similarityTable[i][j-1]: |
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330 return self.subSequence(i, j-1) |
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331 elif self.similarityTable[i][j] == self.similarityTable[i-1][j]: |
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332 return self.subSequence(i-1, j) |
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333 else: |
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334 return self.subSequence(i-1, j-1) + [(i-1,j-1)] |
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335 |
373
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336 def _compute(self, _l1, _l2, computeSubSequence = False): |
370
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337 '''returns the longest common subsequence similarity |
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338 based on the threshold on distance between two elements of lists l1, l2 |
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339 similarityFunc returns True or False whether the two points are considered similar |
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340 |
373
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341 if aligned, returns the best matching if using a finite delta by shiftinig the series alignments |
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342 |
370
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343 eg distance(p1, p2) < epsilon |
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344 ''' |
372
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345 if len(_l2) < len(_l1): # l1 is the shortest |
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346 l1 = _l2 |
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347 l2 = _l1 |
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348 revertIndices = True |
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349 else: |
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350 l1 = _l1 |
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351 l2 = _l2 |
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352 revertIndices = False |
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353 n1 = len(l1) |
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354 n2 = len(l2) |
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355 |
370
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356 if self.aligned: |
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357 lcssValues = {} |
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358 similarityTables = {} |
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359 for i in xrange(-n2-self.delta+1, n1+self.delta): # interval such that [i-shift-delta, i-shift+delta] is never empty, which happens when i-shift+delta < 1 or when i-shift-delta > n2 |
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360 self.similarities(l1, l2, i) |
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361 lcssValues[i] = self.similarityTable.max() |
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362 similarityTables[i] = self.similarityTable |
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363 #print self.similarityTable |
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364 alignmentShift = argMaxDict(lcssValues) # ideally get the medium alignment shift, the one that minimizes distance |
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365 self.similarityTable = similarityTables[alignmentShift] |
372
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366 else: |
389
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367 alignmentShift = 0 |
372
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368 self.similarities(l1, l2) |
373
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369 |
374
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370 # threshold values for the useful part of the similarity table are n2-n1-delta and n1-n2-delta |
389
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371 self.similarityTable = self.similarityTable[:min(n1, n2+alignmentShift+self.delta)+1, :min(n2, n1-alignmentShift+self.delta)+1] |
373
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372 |
372
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373 if computeSubSequence: |
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374 self.subSequenceIndices = self.subSequence(self.similarityTable.shape[0]-1, self.similarityTable.shape[1]-1) |
371
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375 if revertIndices: |
374
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376 self.subSequenceIndices = [(j,i) for i,j in self.subSequenceIndices] |
372
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377 return self.similarityTable[-1,-1] |
370
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378 |
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379 def compute(self, l1, l2, computeSubSequence = False): |
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380 '''get methods are to be shadowed in child classes ''' |
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381 return self._compute(l1, l2, computeSubSequence) |
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382 |
375
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383 def computeAlignment(self): |
370
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384 from numpy import mean |
374
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385 return mean([j-i for i,j in self.subSequenceIndices]) |
370
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386 |
376
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387 def _computeNormalized(self, l1, l2, computeSubSequence = False): |
370
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388 ''' compute the normalized LCSS |
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389 ie, the LCSS divided by the min or mean of the indicator lengths (using lengthFunc) |
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390 lengthFunc = lambda x,y:float(x,y)/2''' |
376
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391 return float(self._compute(l1, l2, computeSubSequence))/self.lengthFunc(len(l1), len(l2)) |
370
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392 |
376
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393 def computeNormalized(self, l1, l2, computeSubSequence = False): |
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394 return self._computeNormalized(l1, l2, computeSubSequence) |
370
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395 |
376
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396 def _computeDistance(self, l1, l2, computeSubSequence = False): |
370
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397 ''' compute the LCSS distance''' |
376
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398 return 1-self._computeNormalized(l1, l2, computeSubSequence) |
370
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399 |
376
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400 def computeDistance(self, l1, l2, computeSubSequence = False): |
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401 return self._computeDistance(l1, l2, computeSubSequence) |
370
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402 |
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403 ######################### |
45
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404 # plotting section |
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405 ######################### |
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406 |
332
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407 def plotPolygon(poly, options = ''): |
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408 'Plots shapely polygon poly' |
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409 from numpy.core.multiarray import array |
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410 from matplotlib.pyplot import plot |
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411 from shapely.geometry import Polygon |
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412 |
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413 tmp = array(poly.exterior) |
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414 plot(tmp[:,0], tmp[:,1], options) |
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415 |
324 | 416 def stepPlot(X, firstX, lastX, initialCount = 0, increment = 1): |
417 '''for each value in X, increment by increment the initial count | |
297
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418 returns the lists that can be plotted |
324 | 419 to obtain a step plot increasing by one for each value in x, from first to last value |
420 firstX and lastX should be respectively smaller and larger than all elements in X''' | |
297
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421 |
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422 sortedX = [] |
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423 counts = [initialCount] |
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424 for x in sorted(X): |
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425 sortedX += [x,x] |
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426 counts.append(counts[-1]) |
324 | 427 counts.append(counts[-1]+increment) |
297
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428 counts.append(counts[-1]) |
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429 return [firstX]+sortedX+[lastX], counts |
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430 |
45
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431 class PlottingPropertyValues: |
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432 def __init__(self, values): |
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433 self.values = values |
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434 |
116
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435 def __getitem__(self, i): |
45
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436 return self.values[i%len(self.values)] |
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437 |
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438 markers = PlottingPropertyValues(['+', '*', ',', '.', 'x', 'D', 's', 'o']) |
116
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439 scatterMarkers = PlottingPropertyValues(['s','o','^','>','v','<','d','p','h','8','+','x']) |
45
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440 |
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441 linestyles = PlottingPropertyValues(['-', '--', '-.', ':']) |
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442 |
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443 colors = PlottingPropertyValues('brgmyck') # 'w' |
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444 |
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445 def plotIndicatorMap(indicatorMap, squareSize, masked = True, defaultValue=-1): |
65
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446 from numpy import array, arange, ones, ma |
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447 from matplotlib.pyplot import pcolor |
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448 coords = array(indicatorMap.keys()) |
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449 minX = min(coords[:,0]) |
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450 minY = min(coords[:,1]) |
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451 X = arange(minX, max(coords[:,0])+1.1)*squareSize |
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452 Y = arange(minY, max(coords[:,1])+1.1)*squareSize |
115
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453 C = defaultValue*ones((len(Y), len(X))) |
65
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454 for k,v in indicatorMap.iteritems(): |
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455 C[k[1]-minY,k[0]-minX] = v |
115
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456 if masked: |
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457 pcolor(X, Y, ma.masked_where(C==defaultValue,C)) |
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458 else: |
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459 pcolor(X, Y, C) |
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460 |
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461 ######################### |
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462 # file I/O section |
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463 ######################### |
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464 |
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465 def openCheck(filename, option = 'r', quit = False): |
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466 '''Open file filename in read mode by default |
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467 and checks it is open''' |
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468 try: |
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469 return open(filename, option) |
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470 except IOError: |
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471 print 'File %s could not be opened.' % filename |
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472 if quit: |
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473 from sys import exit |
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474 exit() |
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475 return None |
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476 |
48
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477 def readline(f, commentCharacter = commentChar): |
0
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478 '''Modified readline function to skip comments.''' |
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479 s = f.readline() |
48
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480 while (len(s) > 0) and s.startswith(commentCharacter): |
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481 s = f.readline() |
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482 return s.strip() |
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483 |
48
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484 def getLines(f, delimiterCharacter = delimiterChar): |
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485 '''Gets a complete entry (all the lines) in between delimiterChar.''' |
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486 dataStrings = [] |
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487 s = readline(f) |
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488 while (len(s) > 0) and (not s.startswith(delimiterCharacter)): |
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489 dataStrings += [s.strip()] |
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490 s = readline(f) |
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491 return dataStrings |
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492 |
304
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493 class FakeSecHead(object): |
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494 '''Add fake section header [asection] |
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495 |
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496 from http://stackoverflow.com/questions/2819696/parsing-properties-file-in-python/2819788#2819788 |
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497 use read_file in Python 3.2+ |
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498 ''' |
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499 def __init__(self, fp): |
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500 self.fp = fp |
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501 self.sechead = '[main]\n' |
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502 |
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503 def readline(self): |
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504 if self.sechead: |
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505 try: return self.sechead |
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506 finally: self.sechead = None |
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507 else: return self.fp.readline() |
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508 |
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509 def removeExtension(filename, delimiter = '.'): |
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510 '''Returns the filename minus the extension (all characters after last .)''' |
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511 i = filename.rfind(delimiter) |
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512 if i>0: |
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513 return filename[:i] |
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514 else: |
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515 return filename |
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516 |
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517 def cleanFilename(s): |
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518 'cleans filenames obtained when contatenating figure characteristics' |
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519 return s.replace(' ','-').replace('.','').replace('/','-') |
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520 |
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521 def listfiles(dirname, extension, remove = False): |
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522 '''Returns the list of files with the extension in the directory dirname |
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523 If remove is True, the filenames are stripped from the extension''' |
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524 from os import listdir |
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525 tmp = [f for f in listdir(dirname) if f.endswith(extension)] |
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526 tmp.sort() |
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527 if remove: |
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528 return [removeExtension(f, extension) for f in tmp] |
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529 else: |
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530 return tmp |
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531 |
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532 def mkdir(dirname): |
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533 'Creates a directory if it does not exist' |
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534 import os |
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535 if not os.path.exists(dirname): |
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536 os.mkdir(dirname) |
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537 else: |
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538 print(dirname+' already exists') |
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539 |
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540 def removeFile(filename): |
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541 '''Deletes the file while avoiding raising an error |
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542 if the file does not exist''' |
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543 import os |
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544 if (os.path.exists(filename)): |
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545 os.remove(filename) |
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546 else: |
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547 print(filename+' does not exist') |
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548 |
42
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549 def line2Floats(l, separator=' '): |
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550 '''Returns the list of floats corresponding to the string''' |
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551 return [float(x) for x in l.split(separator)] |
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552 |
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553 def line2Ints(l, separator=' '): |
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554 '''Returns the list of ints corresponding to the string''' |
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555 return [int(x) for x in l.split(separator)] |
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556 |
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557 ######################### |
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558 # CLI utils |
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559 ######################### |
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560 |
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561 def parseCLIOptions(helpMessage, options, cliArgs, optionalOptions=[]): |
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562 ''' Simple function to handle similar argument parsing |
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563 Returns the dictionary of options and their values |
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564 |
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565 * cliArgs are most likely directly sys.argv |
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566 (only the elements after the first one are considered) |
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567 |
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568 * options should be a list of strings for getopt options, |
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569 eg ['frame=','correspondences=','video='] |
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570 A value must be provided for each option, or the program quits''' |
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571 import sys, getopt |
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572 from numpy.core.fromnumeric import all |
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573 optionValues, args = getopt.getopt(cliArgs[1:], 'h', ['help']+options+optionalOptions) |
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574 optionValues = dict(optionValues) |
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575 |
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576 if '--help' in optionValues.keys() or '-h' in optionValues.keys(): |
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577 print(helpMessage+ |
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578 '\n - Compulsory options: '+' '.join([opt.replace('=','') for opt in options])+ |
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579 '\n - Non-compulsory options: '+' '.join([opt.replace('=','') for opt in optionalOptions])) |
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580 sys.exit() |
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581 |
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582 missingArgument = [('--'+opt.replace('=','') in optionValues.keys()) for opt in options] |
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583 if not all(missingArgument): |
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584 print('Missing argument') |
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585 print(optionValues) |
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586 sys.exit() |
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587 |
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588 return optionValues |
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|
589 |
397
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|
590 |
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591 ######################### |
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592 # Utils to read .ini type text files for configuration, meta data... |
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593 ######################### |
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|
594 |
333
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|
595 class TrackingParameters: |
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596 def loadConfigFile(self, filename): |
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597 from ConfigParser import ConfigParser |
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598 from numpy import loadtxt |
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599 from os import path |
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600 |
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601 config = ConfigParser() |
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602 config.readfp(FakeSecHead(openCheck(filename))) |
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603 self.sectionHeader = config.sections()[0] |
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604 self.videoFilename = config.get(self.sectionHeader, 'video-filename') |
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605 self.databaseFilename = config.get(self.sectionHeader, 'database-filename') |
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606 self.homographyFilename = config.get(self.sectionHeader, 'homography-filename') |
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607 if (path.exists(self.homographyFilename)): |
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608 self.homography = loadtxt(self.homographyFilename) |
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609 else: |
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610 self.homography = None |
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611 self.firstFrameNum = config.getint(self.sectionHeader, 'frame1') |
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612 self.videoFrameRate = config.getfloat(self.sectionHeader, 'video-fps') |
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613 |
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614 self.maxPredictedSpeed = config.getfloat(self.sectionHeader, 'max-predicted-speed')/3.6/self.videoFrameRate |
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615 self.predictionTimeHorizon = config.getfloat(self.sectionHeader, 'prediction-time-horizon')*self.videoFrameRate |
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616 self.collisionDistance = config.getfloat(self.sectionHeader, 'collision-distance') |
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617 self.crossingZones = config.getboolean(self.sectionHeader, 'crossing-zones') |
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618 self.predictionMethod = config.get(self.sectionHeader, 'prediction-method') |
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619 self.nPredictedTrajectories = config.getint(self.sectionHeader, 'npredicted-trajectories') |
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620 self.minAcceleration = config.getfloat(self.sectionHeader, 'min-acceleration')/self.videoFrameRate**2 |
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621 self.maxAcceleration = config.getfloat(self.sectionHeader, 'max-acceleration')/self.videoFrameRate**2 |
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622 self.maxSteering = config.getfloat(self.sectionHeader, 'max-steering')/self.videoFrameRate |
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623 self.useFeaturesForPrediction = config.getboolean(self.sectionHeader, 'use-features-prediction') |
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624 |
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625 class SceneParameters: |
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626 def __init__(self, config, sectionName): |
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627 from ConfigParser import NoOptionError |
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628 from ast import literal_eval |
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629 try: |
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630 self.sitename = config.get(sectionName, 'sitename') |
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631 self.databaseFilename = config.get(sectionName, 'data-filename') |
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632 self.homographyFilename = config.get(sectionName, 'homography-filename') |
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633 self.calibrationFilename = config.get(sectionName, 'calibration-filename') |
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634 self.videoFilename = config.get(sectionName, 'video-filename') |
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635 self.frameRate = config.getfloat(sectionName, 'framerate') |
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636 self.date = datetime.strptime(config.get(sectionName, 'date'), datetimeFormat) # 2011-06-22 11:00:39 |
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637 self.translation = literal_eval(config.get(sectionName, 'translation')) # = [0.0, 0.0] |
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638 self.rotation = config.getfloat(sectionName, 'rotation') |
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639 self.duration = config.getint(sectionName, 'duration') |
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640 except NoOptionError as e: |
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641 print(e) |
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642 print('Not a section for scene meta-data') |
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643 |
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644 @staticmethod |
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645 def loadConfigFile(filename): |
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646 from ConfigParser import ConfigParser |
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647 config = ConfigParser() |
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648 config.readfp(openCheck(filename)) |
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649 configDict = dict() |
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650 for sectionName in config.sections(): |
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651 configDict[sectionName] = SceneParameters(config, sectionName) |
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652 return configDict |
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653 |
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654 |
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655 ######################### |
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656 # sqlite |
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657 ######################### |
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658 |
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659 def printDBError(error): |
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660 print('DB Error: {}'.format(error)) |
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661 |
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662 def dropTables(connection, tableNames): |
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663 'deletes the table with names in tableNames' |
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664 import sqlite3 |
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665 try: |
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666 cursor = connection.cursor() |
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667 for tableName in tableNames: |
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668 cursor.execute('DROP TABLE IF EXISTS '+tableName) |
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669 except sqlite3.OperationalError as error: |
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670 printDBError(error) |
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671 |
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672 ######################### |
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673 # running tests |
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674 ######################### |
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675 |
0
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676 if __name__ == "__main__": |
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677 import doctest |
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678 import unittest |
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679 suite = doctest.DocFileSuite('tests/utils.txt') |
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680 #suite = doctest.DocTestSuite() |
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681 unittest.TextTestRunner().run(suite) |
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682 #doctest.testmod() |
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683 #doctest.testfile("example.txt") |