I wrote a small piece of following code
import nltk
from nltk.corpus.reader import TaggedCorpusReader
from nltk.tag import CRFTagger
def NE_TAGGER():
reader = TaggedCorpusReader('/python27/', r'.*\.pos')
f1=reader.fileids()
print "The Files of Corpus are:",f1
sents=reader.tagged_sents()
ls=len(sents)
print "Length of Corpus Is:",ls
train_data=sents[:300]
test_data=sents[301:350]
ct = CRFTagger()
crf_tagger=ct.train(train_data,'model.crf.tagger')
This code is working fine.
Now if I change the data size to say 500 or 3000 in train_data by giving
train_data=sents[:500] or
train_data=sents[:3000] it is giving me the following error.
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
NE_TAGGER()
File "C:\Python27\HindiCRFNERTagger1.py", line 20, in NE_TAGGER
crf_tagger=ct.train(train_data,'model.crf.tagger')
File "C:\Python27\lib\site-packages\nltk\tag\crf.py", line 185, in train
trainer.append(features,labels)
File "pycrfsuite\_pycrfsuite.pyx", line 312, in
pycrfsuite._pycrfsuite.BaseTrainer.append (pycrfsuite/_pycrfsuite.cpp:3800)
File "stringsource", line 53, in
vector.from_py.__pyx_convert_vector_from_py_std_3a__3a_string
(pycrfsuite/_pycrfsuite.cpp:10738)
File "stringsource", line 15, in
string.from_py.__pyx_convert_string_from_py_std__in_string
(pycrfsuite/_pycrfsuite.cpp:10633)
TypeError: expected string or Unicode object, NoneType found
>>>
I have searched for solutions in web found the following links as,
https://stackoverflow.com/questions/14219038/python-multiprocessing-typeerror-expected-string-or-unicode-object-nonetype-f
or
https://github.com/kamakazikamikaze/easysnmp/issues/50
reloaded Python but did not find much help.
I am using Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:22:17) [MSC
v.1500 32 bit (Intel)] on win32
My O/S is, MS-Windows 7.
If any body may kindly suggest a resolution.
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