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From "Tim Miller (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CTAKES-266) tokenizer creates empty tokens before contractions
Date Wed, 13 Nov 2013 15:03:25 GMT
Tim Miller created CTAKES-266:
---------------------------------

             Summary: tokenizer creates empty tokens before contractions
                 Key: CTAKES-266
                 URL: https://issues.apache.org/jira/browse/CTAKES-266
             Project: cTAKES
          Issue Type: Bug
          Components: ctakes-core
    Affects Versions: 3.1
            Reporter: Tim Miller
            Assignee: Tim Miller
            Priority: Minor
             Fix For: 3.1.1


Normally contractions are tokenized as follows:

don't = do + n't

And the code in ContractionsPTB will create a WordToken for the do and a ContractionToken
for the n't. (There is some special logic for n't.) There are some weird cases with n't with
no preceding text. In my case it was some non-clinical text ("surf n'turf") but you can imagine
typos as well (do n't). In these cases the preceding text is actually empty since it is the
start of the token, and the code will create an empty WordToken, which can screw up downstream
components (I noticed it in the parser). This can be fixed easily by checking for token length
of 0 before creating the word token.




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