class FeatFunctions(object):
"""docstring for featFunctions"""
def __init__(self, n_features=None):
# self.arg = arg
import re
from sklearn.feature_extraction.text import FeatureHasher
from numpy.random import randn, randint
from sklearn.feature_extraction.text import CountVectorizer
# Define some parameters:
if not n_features:
n_features = 100000
# Initialize the hasher:
self.hasher = FeatureHasher(n_features=n_features, input_type="string", non_negative=True)
# Initialize the ngram:
self.vectorizer = CountVectorizer(binary=True)
# Feature name-function dictionary:
self.featName_function = {"url": self.url, "all_caps": self.all_caps, "ngrams": self.ngrams}
def all_caps(self, x):
pat = re.compile(r"^[A-Z\d]+$")
groups = pat.match(x)
if groups:
return ["f_all_caps"]
def url(self, x):
pat = re.compile("http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+")
groups = pat.findall(x)
if groups:
return ["f_url"]
def ngrams(self, x):
ngram_feats = self.vectorizer.fit_transform([x])
return self.vectorizer.inverse_transform(ngram_feats)[0].tolist()
# An observation function that extracts features. x is a raw text
def getObsFeatures(self, x, feat_list):
str_feats = []
for feat in feat_list:
feat = feat(x)
if feat:
str_feats += feat
return str_feats
def getYXFeatures(self, y_name, y_idx, obs_feat_list):
# return y_name+'_'+str(y_idx).join(obs_feat_list)
# return map(lambda x,y:x+y,y_name+'_'+str(y_idx),obs_feat_list)
xy_feat = [y_name + str(y_idx) + "_" + xfeat for xfeat in obs_feat_list]
# print xy_feat
hashed_feats = self.hasher.transform([xy_feat])
# return hashed_feats.nonzero()[1]
return hashed_feats
def trainClassifier(batchSize, dataFolder, clfFolderName, tagsSplitSize):
startTime = time()
if not os.path.exists(clfFolderName):
os.makedirs(clfFolderName)
if not os.path.exists(clfFolderName + 'Temp'):
os.makedirs(clfFolderName + 'Temp')
tags = list(USED_TAGS.keys())
totalRows = getTotalRows('data/' + dataFolder + '/TrainIds')
hasher = FeatureHasher()
batchGen = batchGenerator(batchSize, dataFolder, 'Train', totalRows)
hashInd = 1
print 'number of tags : ' + str(len(tags))
extractor = FeatureExtractor()
for _, X, _ in batchGen:
batchTime = time()
print 'computing batch : ' + str(hashInd)
X_batch = hasher.transform(extractor.extract(sample) for sample in X)
print 'saving batch : ' + str(hashInd)
with open(clfFolderName + 'Temp/' + str(hashInd) + '.pkl',
'wb') as fid:
cPickle.dump(X_batch, fid)
print 'batch time : ' + str(time() - batchTime)
hashInd += 1
with open(clfFolderName + '/hasher.pkl', 'wb') as fid:
cPickle.dump(hasher, fid)
with open(clfFolderName + '/extractor.pkl', 'wb') as fid:
cPickle.dump(extractor, fid)
print 'hashing time : ' + str(time() - startTime)
tagIndDic = {}
tagInd = 1
loop = 1
for currTags in [
tags[i:i + tagsSplitSize]
for i in range(0, len(tags), tagsSplitSize)
]:
iterStartTime = time()
print 'tags iteration : ' + str(loop)
clfDic = {}
for tag in currTags:
clfDic[tag] = Perceptron(alpha=ALPHA, n_iter=N_ITER)
batchGen = batchGenerator(batchSize, dataFolder, 'Train', totalRows)
batchInd = 1
for _, _, targets_in_batch in batchGen:
batchTime = time()
print 'batch number : ' + str(batchInd)
with open(clfFolderName + 'Temp/' + str(batchInd) + '.pkl',
'rb') as fp:
X_batch = cPickle.load(fp)
for tag in currTags:
Y_batch_binary = toBinary(tag, targets_in_batch)
clfDic[tag].partial_fit(X_batch,
Y_batch_binary,
classes=[0, 1])
batchInd += 1
print 'batch time : ' + str(time() - batchTime)
for tag in clfDic:
clfDic[tag].sparsify()
tagIndDic[tag] = tagInd
with open(clfFolderName + '/' + str(tagInd) + '.pkl', 'wb') as fid:
cPickle.dump(clfDic[tag], fid)
tagInd += 1
loop += 1
print 'iter time : ' + str(time() - iterStartTime)
print
print 'saving model...'
with open(clfFolderName + '/tagIndDic.pkl', 'wb') as fid:
cPickle.dump(tagIndDic, fid)
print 'total time : ' + str(time() - startTime)
# X = crfutils.get_features(feature_extractor, fields=fields, sep=separator)
# doc = []
Y = set()
for x in X:
for entry in x:
Y.add(entry['y'])
# doc.append(entry['F'])
# return X, hf.transform(doc)
return X, list(Y)
if __name__ == '__main__':
# pass
# crfutils.main(feature_extractor, fields=fields, sep=separator)
X = crfutils.get_features(feature_extractor, fields=fields, sep=separator)
# Apply the hashing trick
hf = FeatureHasher(input_type='string',non_negative=True)
# # List of dictionaries:
# x_set = set()
# # Iterate over each of the tokens features:
doc = []
for x in X:
# sg_tv.transform(x)
for entry in x:
# print entry['F']
doc+=entry['F']
# vec = sg_tv.transform(doc)
print hf.transform(doc)
def trainClassifier(batchSize,dataFolder,clfFolderName,tagsSplitSize):
startTime = time()
if not os.path.exists(clfFolderName):
os.makedirs(clfFolderName)
if not os.path.exists(clfFolderName+'Temp'):
os.makedirs(clfFolderName+'Temp')
tags = list(USED_TAGS.keys())
totalRows = getTotalRows('data/'+dataFolder+'/TrainIds')
hasher = FeatureHasher()
batchGen = batchGenerator(batchSize,dataFolder,'Train',totalRows)
hashInd = 1
print 'number of tags : ' + str(len(tags))
extractor = FeatureExtractor()
for _,X,_ in batchGen:
batchTime = time()
print 'computing batch : ' + str(hashInd)
X_batch = hasher.transform(extractor.extract(sample) for sample in X)
print 'saving batch : ' + str(hashInd)
with open(clfFolderName+'Temp/'+str(hashInd)+'.pkl', 'wb') as fid:
cPickle.dump(X_batch, fid)
print 'batch time : ' + str(time()-batchTime)
hashInd+=1
with open(clfFolderName+'/hasher.pkl', 'wb') as fid:
cPickle.dump(hasher, fid)
with open(clfFolderName+'/extractor.pkl', 'wb') as fid:
cPickle.dump(extractor, fid)
print 'hashing time : ' + str(time()-startTime)
tagIndDic = {}
tagInd = 1
loop = 1
for currTags in [tags[i:i+tagsSplitSize] for i in range(0,len(tags),tagsSplitSize)]:
iterStartTime = time()
print 'tags iteration : ' + str(loop)
clfDic = {}
for tag in currTags:
clfDic[tag] = Perceptron(alpha=ALPHA,n_iter=N_ITER)
batchGen = batchGenerator(batchSize,dataFolder,'Train',totalRows)
batchInd = 1
for _,_,targets_in_batch in batchGen:
batchTime = time()
print 'batch number : ' + str(batchInd)
with open(clfFolderName+'Temp/'+str(batchInd)+'.pkl','rb') as fp:
X_batch=cPickle.load(fp)
for tag in currTags:
Y_batch_binary = toBinary(tag,targets_in_batch)
clfDic[tag].partial_fit(X_batch, Y_batch_binary, classes=[0,1])
batchInd+=1
print 'batch time : ' + str(time()-batchTime)
for tag in clfDic:
clfDic[tag].sparsify()
tagIndDic[tag]=tagInd
with open(clfFolderName+'/'+str(tagInd)+'.pkl', 'wb') as fid:
cPickle.dump(clfDic[tag], fid)
tagInd+=1
loop+=1
print 'iter time : ' + str(time()-iterStartTime)
print
print 'saving model...'
with open(clfFolderName+'/tagIndDic.pkl', 'wb') as fid:
cPickle.dump(tagIndDic, fid)
print 'total time : ' + str(time()-startTime)
