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Newsgroups: comp.lang.python
Date: Sat, 6 Apr 2013 14:13:57 -0700 (PDT)
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Subject: Re: Error in Python NLTK
From: subhabangalore@gmail.com
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On Sunday, April 7, 2013 2:14:41 AM UTC+5:30, Dave Angel wrote:
> On 04/06/2013 03:56 PM, subhabangalore@gmail.com wrote:
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> > Dear Group,
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> >
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> > I was using a package named NLTK in Python.
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> >
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> > I was trying to write a code given in section 3.8 of
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> >
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> > http://docs.huihoo.com/nltk/0.9.5/guides/tag.html.
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> >
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> > Here, in the >>> test =3D ['up', 'down', 'up'] if I put more than 3 val=
ues and trying to write the reciprocal codes, like,
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> >
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> >              sequence =3D [(t, None) for t in test] and print '%.3f' % =
(model.probability(sequence))
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> This 'and' operator is going to try to interpret the previous list as a=
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> boolean.  Could that be your problem?  Why aren't you putting these two=
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> statements on separate lines?  And what version of Python are you using?=
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>   If 2.x, you should get a syntax error because print is a statement.=20
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> If 3.x, you should get a different error because you don't put parens=20
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> around the preint expression.
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> >
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> > I am getting an error as,
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> >
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> > Traceback (most recent call last): File "", line 1, in model.probabilit=
y(sequence) File "C:\Python27\lib\site-packages\nltk\tag\hmm.py", line 228,=
 in probability return 2**(self.log_probability(self._transform.transform(s=
equence))) File "C:\Python27\lib\site-packages\nltk\tag\hmm.py", line 259, =
in log_probability alpha =3D self._forward_probability(sequence) File "C:\P=
ython27\lib\site-packages\nltk\tag\hmm.py", line 694, in _forward_probabili=
ty alpha[0, i] =3D self._priors.logprob(state) + \ File "C:\Python27\lib\si=
te-packages\nltk\probability.py", line 689, in logprob elif self._prob_dict=
[sample] =3D=3D 0: return _NINF ValueError: The truth value of an array wit=
h more than one element is ambiguous. Use a.any() or a.all()
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> >
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> > If any learned member may kindly assist me how may I solve the issue.
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> >
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> Your error display has been trashed, thanks to googlegroups.
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>      http://wiki.python.org/moin/GoogleGroupsPython
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> Try posting with a text email message, since this is a text forum.
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> Your code is also sparse.  Why do you point us to fragments on the net,=
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> when you could show us the exact code you were running when it failed?=20
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> I'm guessing you're running it from the interpreter, which can be very=20
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> confusing once you have to ask for help.  Please put a sample of code=20
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> into a file, run it, and paste into your text email both the contents of=
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> that file and the full traceback.  thanks.
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> The email address to post on this forum is  python-list@python.org
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> --=20
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> DaveA

Thanks Dave for your kind suggestions. I am checking on them and if I get a=
ny questions I am sending the room in detailed manner. Regards,Subhabrata.