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From Pei Chen <chen...@apache.org>
Subject Re: question about CTAKES
Date Thu, 18 Dec 2014 03:21:49 GMT
I think that's a current limitation in the new Polarity Classifier.  It's
ML based, so most likely 'Deny XYZ' or 'Negative for XYZ' is probably not
in the training data.  There are a couple of things I would suggest:
1) Post the questions/examples to dev@ctakes.apache.org - perhaps others
may have some ideas
2) Open a Jira issue to track the issue
3) You can try to Revert back to either the old 'Assertion' module or the
previous RegEx based 'NegationAnnotator' (currently commented out in the
xml descriptor file.) [I am assuming you are using the latest trunk or
3.2.1 release.

Hope that helps...

On Wed, Dec 17, 2014 at 5:38 PM, Sisi Ma <sophie.sisi.ma@gmail.com> wrote:
>  Hi Pei,
> I have a quick question about CTAKES.
> I am using AE “AggregatePlaintextUMLSProcessor.xml” and want to get some
> negation results by referring to polarity attribute.
> However, it turns out, for example “Negative for hepatitis”, is not
> negated. I think it is weird and I tried “No hepatitis”, “ Denies
> hepatitis” which return “polarity= -1”, but “Deny hepatitis.” returns
> “polarity=1”.
> Could you give me some clue that what is wrong?
> Thanks.

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