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RuleMakerNextTag
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import nltk
from nltk import *
from nltk.corpus import brown
import numpy
from numpy import *
import time
def findmaxtag(good, bad):
curMax = 0
curTag = ' '
for tag in good:
if(good[tag]-bad[tag] > curMax):
curMax = good[tag]-bad[tag]
curTag = tag
return curTag, curMax
def applyrule_previoustag(from_tag, to_tag, previous_tag, oldcorpus):
i = 0
newcorpus = []
for word in oldcorpus:
if (i==0):
newcorpus.append(tuple([word[0], word[1]]))
elif ((oldcorpus[i-1][1] == previous_tag) and (word[1] == from_tag)):
newcorpus.append(tuple([word[0], to_tag]))
#print 'Orig: ',word, 'New: ',newcorpus[-1]
else:
newcorpus.append(tuple([word[0],word[1]]))
i=i+1
return newcorpus
def comparetags(true,test):
if(len(true) != len(test)):
return 'Cant compare....lengths not the same'
i,wrong = 0,0
wronglist = []
for i in range(len(true)):
if(test[i][1] != true[i][1]):
wronglist.append(test[i][1])
wrong += 1
return wronglist,(len(true)-wrong)*100.0/len(true)
#####################################
start = time.time()
trainpercent = 2
words = brown.words()
ntotal = len(words)
words = words[:int32(ntotal*trainpercent/100)]
testwords = words[-(ntotal-len(words)):]
t = brown.tagged_words(simplify_tags=True)[:len(words)]
words = [w.lower() for w in words]
tagwords = []
for word in t:
tagwords.append(tuple([word[0].lower(),word[1]]))
nwords = len(tagwords)
tagSet = []
for word in tagwords:
tagSet.append(word[1])
tagSet = set(tagSet)
tagSet = list(tagSet)
fdist = FreqDist(words)
fkeys = fdist.keys()
fprob = []
for i in range(0,fdist.B()):
fprob.append(fdist.freq(fkeys[i]))
tagcfd = ConditionalFreqDist(tagwords)
tagcfdkeys = tagcfd.keys()
mostlikelytag = []
for i in range(nwords):
w = tagwords[i][0]
mostlikelytag.append(tuple([w, tagcfd[w].max()]))
##wrong = 0
##for i in range(nwords):
## if (mostlikelytag[i][1] != tagwords[i][1]):
## wrong = wrong + 1
wronglist,accuracy = comparetags(tagwords, mostlikelytag)
elapsed = time.time()-start
print 'Time: ',elapsed,' Accuracy: ',accuracy
#####################################
ambclass = dict()
for word in words:
if (word not in ambclass):
tag = tagcfd[word].items()
tmp = []
for i in tag:
tmp.append(i[0])
ambclass[word] = tmp
#####################################
num_good_T = dict()
num_bad_T = dict()
bestrulelist = []
thresh = 0
startOverall = time.time()
while (True):
start = time.time()
maxval = 0
counter1 = 0
for from_tag in tagSet:
#print counter1
counter1 += 1
counter2 = 0
for to_tag in tagSet:
#print " ", counter2
counter2 += 1
i = 1
for itr in tagSet:
num_good_T[itr] = 0
num_bad_T[itr] = 0
itr = 0
for word in mostlikelytag[1:]:
correct_tag = tagwords[i][1]
taglist = ambclass[word[0]]
if(correct_tag == to_tag and word[1] == from_tag):
num_good_T[mostlikelytag[i-1][1]] += 1
if(correct_tag == from_tag and word[1] == from_tag):
num_bad_T[mostlikelytag[i-1][1]] += 1
i += 1
maxtag, val = findmaxtag(num_good_T,num_bad_T)
if (val>maxval):
#print 'Good ', num_good_T
#print 'Bad', num_bad_T
#raw_input("Press enter to exit")
#print ' Maxtag: ',maxtag,' New max: ',val
maxval = val
changefrom_tag = from_tag
changeto_tag = to_tag
changeprev_tag = maxtag
#raw_input("Press enter to exit")
if (maxval < thresh):
break
oldlist = list(mostlikelytag)
mostlikelytag = applyrule_previoustag(changefrom_tag,changeto_tag,changeprev_tag,mostlikelytag)
bestrulelist.append([changefrom_tag,changeto_tag,changeprev_tag])
oldwrongtags, oldaccuracy = comparetags(tagwords, oldlist)
newwrongtags, newaccuracy = comparetags(tagwords, mostlikelytag)
fold = FreqDist(oldwrongtags)
fnew = FreqDist(newwrongtags)
print fold.items()
print
print fnew.items()
print
print 'Maxval: ', maxval
elapsed = time.time()-start
#print 'Rule List: ',bestrulelist
print 'Time: ',elapsed,' Accuracy of rule: ',newaccuracy, ' List: ',bestrulelist[-1]
#raw_input("Press Enter....")
print 'TOTAL TIME: ', time.time()-startOverall