subhabangal...@gmail.com wrote:
> 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]
Offtopic: not that sents[300] is neither in the training nor in the test
data; Python uses half-open intervals.
> 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.
What about sents[:499], sents[:498], ...?
I'm not an nltk user, but to debug the problem I suggest that you identify
the exact index that triggers the exception, and then print it
print sents[minimal_index_that_causes_typeerror]
Perhaps you can spot a problem with the input data.
(In the spirit of the "offtopic" remark: if sents[:333] triggers the failure
you have to print sents[332])
> 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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