Mercurial Hosting > traffic-intelligence
annotate python/indicators.py @ 676:58b9ac2f262f
fine tuning
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Wed, 27 May 2015 04:08:19 +0200 |
parents | 15e244d2a1b5 |
children | fa9aa5f08210 |
rev | line source |
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1 #! /usr/bin/env python |
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2 '''Class for indicators, temporal indicators, and safety indicators''' |
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3 |
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4 import moving |
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5 |
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6 |
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7 # need for a class representing the indicators, their units, how to print them in graphs... |
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8 class TemporalIndicator(object): |
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9 '''Class for temporal indicators |
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10 i.e. indicators that take a value at specific instants |
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11 |
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12 values should be |
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13 * a dict, for the values at specific time instants |
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14 * or a list with a time interval object if continuous measurements |
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15 |
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16 it should have more information like name, unit''' |
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17 |
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18 def __init__(self, name, values, timeInterval=None, maxValue = None): |
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19 self.name = name |
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20 if timeInterval: |
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21 assert len(values) == timeInterval.length() |
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22 self.timeInterval = timeInterval |
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23 self.values = {} |
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24 for i in xrange(int(round(self.timeInterval.length()))): |
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25 self.values[self.timeInterval[i]] = values[i] |
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26 else: |
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27 self.values = values |
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28 instants = sorted(self.values.keys()) |
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29 if instants: |
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30 self.timeInterval = moving.TimeInterval(instants[0], instants[-1]) |
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31 else: |
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32 self.timeInterval = moving.TimeInterval() |
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33 self.maxValue = maxValue |
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34 |
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35 def __len__(self): |
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36 return len(self.values) |
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37 |
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38 def empty(self): |
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39 return len(self.values) == 0 |
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40 |
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41 def __getitem__(self, t): |
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42 'Returns the value at time t' |
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43 if t in self.values.keys(): |
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44 return self.values[t] |
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45 else: |
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46 return None |
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47 |
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48 def getIthValue(self, i): |
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49 sortedKeys = sorted(self.values.keys()) |
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50 if 0<=i<len(sortedKeys): |
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51 return self.values[sortedKeys[i]] |
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52 else: |
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53 return None |
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54 |
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55 def __iter__(self): |
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56 self.iterInstantNum = 0 # index in the interval or keys of the dict |
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57 return self |
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58 |
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59 def next(self): |
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60 if self.iterInstantNum >= len(self.values):#(self.timeInterval and self.iterInstantNum>=self.timeInterval.length())\ |
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61 # or (self.iterInstantNum >= self.values) |
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62 raise StopIteration |
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63 else: |
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64 self.iterInstantNum += 1 |
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65 return self.getIthValue(self.iterInstantNum-1) |
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66 |
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67 def getTimeInterval(self): |
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68 return self.timeInterval |
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69 |
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70 def getName(self): |
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71 return self.name |
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72 |
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73 def getValues(self): |
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74 return [self.__getitem__(t) for t in self.timeInterval] |
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75 |
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76 def plot(self, options = '', xfactor = 1., yfactor = 1., timeShift = 0, **kwargs): |
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77 from matplotlib.pylab import plot,ylim |
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78 if self.getTimeInterval().length() == 1: |
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79 marker = 'o' |
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80 else: |
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81 marker = '' |
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82 time = sorted(self.values.keys()) |
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83 plot([(x+timeShift)/xfactor for x in time], [self.values[i]/yfactor for i in time], options+marker, **kwargs) |
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84 if self.maxValue: |
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85 ylim(ymax = self.maxValue) |
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86 |
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87 def valueSorted(self): |
312 | 88 ''' return the values after sort the keys in the indicator |
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89 This should probably not be used: to delete''' |
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90 print('Deprecated: values should not be accessed in this way') |
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91 values=[] |
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92 keys = self.values.keys() |
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93 keys.sort() |
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94 for key in keys: |
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95 values.append(self.values[key]) |
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96 return values |
312 | 97 |
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98 |
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99 def l1Distance(x, y): # lambda x,y:abs(x-y) |
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100 if x is None or y is None: |
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101 return float('inf') |
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102 else: |
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103 return abs(x-y) |
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104 |
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105 from utils import LCSS as utilsLCSS |
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106 |
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107 class LCSS(utilsLCSS): |
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108 '''Adapted LCSS class for indicators, same pattern''' |
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109 def __init__(self, similarityFunc, delta = float('inf'), minLength = 0, aligned = False, lengthFunc = min): |
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110 utilsLCSS.__init__(self, similarityFunc, delta, aligned, lengthFunc) |
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111 self.minLength = minLength |
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112 |
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113 def checkIndicator(self, indicator): |
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114 return indicator is not None and len(indicator) >= self.minLength |
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115 |
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116 def compute(self, indicator1, indicator2, computeSubSequence = False): |
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117 if self.checkIndicator(indicator1) and self.checkIndicator(indicator2): |
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118 return self._compute(indicator1.getValues(), indicator2.getValues(), computeSubSequence) |
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119 else: |
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120 return 0 |
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121 |
376
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122 def computeNormalized(self, indicator1, indicator2, computeSubSequence = False): |
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123 if self.checkIndicator(indicator1) and self.checkIndicator(indicator2): |
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124 return self._computeNormalized(indicator1.getValues(), indicator2.getValues(), computeSubSequence) |
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125 else: |
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126 return 0. |
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127 |
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128 def computeDistance(self, indicator1, indicator2, computeSubSequence = False): |
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129 if self.checkIndicator(indicator1) and self.checkIndicator(indicator2): |
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130 return self._computeDistance(indicator1.getValues(), indicator2.getValues(), computeSubSequence) |
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131 else: |
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132 return 1. |
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133 |
244
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134 class SeverityIndicator(TemporalIndicator): |
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135 '''Class for severity indicators |
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136 field mostSevereIsMax is True |
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137 if the most severe value taken by the indicator is the maximum''' |
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138 |
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139 def __init__(self, name, values, timeInterval=None, mostSevereIsMax=True, maxValue = None): |
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140 TemporalIndicator.__init__(self, name, values, timeInterval, maxValue) |
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141 self.mostSevereIsMax = mostSevereIsMax |
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142 |
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143 def getMostSevereValue(self, minNInstants=1): # TODO use np.percentile |
244
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144 from matplotlib.mlab import find |
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145 from numpy.core.multiarray import array |
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146 from numpy.core.fromnumeric import mean |
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147 values = array(self.values.values()) |
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148 indices = range(len(values)) |
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149 if len(indices) >= minNInstants: |
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150 values = sorted(values[indices], reverse = self.mostSevereIsMax) # inverted if most severe is max -> take the first values |
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151 return mean(values[:minNInstants]) |
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152 else: |
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153 return None |
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154 |
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155 # functions to aggregate discretized maps of indicators |
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156 # TODO add values in the cells between the positions (similar to discretizing vector graphics to bitmap) |
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157 |
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158 def indicatorMap(indicatorValues, trajectory, squareSize): |
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159 '''Returns a dictionary |
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160 with keys for the indices of the cells (squares) |
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161 in which the trajectory positions are located |
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162 at which the indicator values are attached |
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163 |
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164 ex: speeds and trajectory''' |
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165 |
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166 from numpy import floor, mean |
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167 assert len(indicatorValues) == trajectory.length() |
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168 indicatorMap = {} |
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169 for k in xrange(trajectory.length()): |
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170 p = trajectory[k] |
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171 i = floor(p.x/squareSize) |
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172 j = floor(p.y/squareSize) |
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173 if indicatorMap.has_key((i,j)): |
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174 indicatorMap[(i,j)].append(indicatorValues[k]) |
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175 else: |
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176 indicatorMap[(i,j)] = [indicatorValues[k]] |
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177 for k in indicatorMap.keys(): |
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178 indicatorMap[k] = mean(indicatorMap[k]) |
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179 return indicatorMap |
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180 |
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181 def indicatorMapFromPolygon(value, polygon, squareSize): |
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182 '''Fills an indicator map with the value within the polygon |
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183 (array of Nx2 coordinates of the polygon vertices)''' |
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184 import matplotlib.nxutils as nx |
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185 from numpy.core.multiarray import array, arange |
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186 from numpy import floor |
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187 |
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188 points = [] |
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189 for x in arange(min(polygon[:,0])+squareSize/2, max(polygon[:,0]), squareSize): |
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190 for y in arange(min(polygon[:,1])+squareSize/2, max(polygon[:,1]), squareSize): |
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191 points.append([x,y]) |
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192 inside = nx.points_inside_poly(array(points), polygon) |
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193 indicatorMap = {} |
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194 for i in xrange(len(inside)): |
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195 if inside[i]: |
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196 indicatorMap[(floor(points[i][0]/squareSize), floor(points[i][1]/squareSize))] = 0 |
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197 return indicatorMap |
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198 |
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199 def indicatorMapFromAxis(value, limits, squareSize): |
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200 '''axis = [xmin, xmax, ymin, ymax] ''' |
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201 from numpy.core.multiarray import arange |
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202 from numpy import floor |
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203 indicatorMap = {} |
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204 for x in arange(limits[0], limits[1], squareSize): |
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205 for y in arange(limits[2], limits[3], squareSize): |
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206 indicatorMap[(floor(x/squareSize), floor(y/squareSize))] = value |
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207 return indicatorMap |
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208 |
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209 def combineIndicatorMaps(maps, squareSize, combinationFunction): |
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210 '''Puts many indicator maps together |
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211 (averaging the values in each cell |
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212 if more than one maps has a value)''' |
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213 #from numpy import mean |
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214 indicatorMap = {} |
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215 for m in maps: |
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216 for k,v in m.iteritems(): |
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217 if indicatorMap.has_key(k): |
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218 indicatorMap[k].append(v) |
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219 else: |
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220 indicatorMap[k] = [v] |
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221 for k in indicatorMap.keys(): |
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222 indicatorMap[k] = combinationFunction(indicatorMap[k]) |
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223 return indicatorMap |
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224 |
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225 if __name__ == "__main__": |
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226 import doctest |
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227 import unittest |
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228 suite = doctest.DocFileSuite('tests/indicators.txt') |
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229 unittest.TextTestRunner().run(suite) |
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230 # #doctest.testmod() |
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231 # #doctest.testfile("example.txt") |