Mercurial Hosting > traffic-intelligence
annotate scripts/learn-motion-patterns.py @ 844:5a68779d7777
added capability to save prototypes
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Thu, 14 Jul 2016 00:34:59 -0400 |
parents | 5dc7a507353e |
children | 0cb69238e6f5 |
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1 #! /usr/bin/env python |
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2 |
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3 import sys, argparse |
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4 |
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5 #import matplotlib.pyplot as plt |
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6 import numpy as np |
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7 |
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8 import ml, utils, storage |
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9 |
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10 parser = argparse.ArgumentParser(description='The program learns prototypes for the motion patterns') #, epilog = '' |
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11 #parser.add_argument('--cfg', dest = 'configFilename', help = 'name of the configuration file') |
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12 parser.add_argument('-d', dest = 'databaseFilename', help = 'name of the Sqlite database file', required = True) |
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13 parser.add_argument('-t', dest = 'trajectoryType', help = 'type of trajectories to display', choices = ['objectfeatures', 'feature', 'object'], default = 'objectfeatures') |
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14 parser.add_argument('--max-nobjectfeatures', dest = 'maxNObjectFeatures', help = 'maximum number of features per object to load', type = int, default = 3) |
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15 parser.add_argument('-n', dest = 'nTrajectories', help = 'number of the object or feature trajectories to load', type = int, default = None) |
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16 parser.add_argument('-e', dest = 'epsilon', help = 'distance for the similarity of trajectory points', type = float, required = True) |
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17 parser.add_argument('--metric', dest = 'metric', help = 'metric for the similarity of trajectory points', default = 'cityblock') # default is manhattan distance |
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18 parser.add_argument('-s', dest = 'minSimilarity', help = 'minimum similarity to put a trajectory in a cluster', type = float, required = True) |
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19 parser.add_argument('-c', dest = 'minClusterSize', help = 'minimum cluster size', type = int, default = None) |
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20 parser.add_argument('--random', dest = 'randomInitialization', help = 'random initialization of clustering algorithm', action = 'store_true') |
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21 parser.add_argument('--subsample', dest = 'positionSubsamplingRate', help = 'rate of position subsampling (1 every n positions)', type = int, default = None) |
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22 parser.add_argument('--display', dest = 'display', help = 'display trajectories', action = 'store_true') |
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23 parser.add_argument('--save-similarities', dest = 'saveSimilarities', help = 'save computed similarities (in addition to prototypes)', action = 'store_true') |
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24 |
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25 args = parser.parse_args() |
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26 |
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27 # TODO parameters (random init?) and what to learn from: objects, features, longest features from objects |
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28 # TODO add possibility to cluter with velocities |
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29 |
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30 trajectoryType = args.trajectoryType |
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31 if args.trajectoryType == 'objectfeatures': |
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32 trajectoryType = 'object' |
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33 |
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34 #features = storage.loadTrajectoriesFromSqlite(databaseFilename, args.trajectoryType) |
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35 objects = storage.loadTrajectoriesFromSqlite(args.databaseFilename, trajectoryType, withFeatures = (args.trajectoryType == 'objectfeatures'), objectNumbers = args.nTrajectories, timeStep = args.positionSubsamplingRate) |
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36 |
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37 if args.trajectoryType == 'objectfeatures': |
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38 features = [] |
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39 for o in objects: |
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40 tmp = utils.sortByLength(o.getFeatures(), reverse = True) |
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41 features += tmp[:min(len(tmp), args.maxNObjectFeatures)] |
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42 objects = features |
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43 |
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44 trajectories = [o.getPositions().asArray().T for o in objects] |
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45 |
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46 lcss = utils.LCSS(metric = args.metric, epsilon = args.epsilon) |
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47 nTrajectories = len(trajectories) |
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48 |
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49 similarities = -np.ones((nTrajectories, nTrajectories)) |
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51 prototypeIndices, labels = ml.prototypeCluster(trajectories, similarities, args.minSimilarity, lambda x,y : lcss.computeNormalized(x, y), args.minClusterSize, args.randomInitialization) # this line can be called again without reinitializing similarities |
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52 |
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53 clusterSizes = ml.computeClusterSizes(labels, prototypeIndices, -1) |
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54 print(clusterSizes) |
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55 |
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56 storage.savePrototypesToSqlite(args.databaseFilename, [objects[i].getNum() for i in prototypeIndices], args.trajectoryType, {objects[i].getNum():clusterSizes[i] for i in prototypeIndices}) |
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57 |
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58 if args.saveSimilarities: |
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59 np.savetxt(utils.removeExtension(args.databaseFilename)+'-prototype-similarities.txt.gz', similarities, '%.4f') |
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60 |
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61 if args.display: |
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62 from matplotlib.pyplot import figure, show, axis |
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63 figure() |
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64 for i,o in enumerate(objects): |
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65 if i not in prototypeIndices: |
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66 if labels[i] < 0: |
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67 o.plot('kx') |
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68 else: |
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69 o.plot(utils.colors[labels[i]]) |
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70 for i in prototypeIndices: |
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71 objects[i].plot(utils.colors[i]+'o') |
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72 axis('equal') |
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73 show() |
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74 |
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75 # TODO store the prototypes trajectories, add option so store similarities (the most expensive stuff) with limited accuracy |