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From "Thilo Goetz (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Closed: (UIMA-1193) Tagger throws occasional NPE
Date Thu, 02 Oct 2008 17:25:44 GMT

     [ https://issues.apache.org/jira/browse/UIMA-1193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thilo Goetz closed UIMA-1193.
-----------------------------

    Resolution: Fixed

Ok, I think I have it this time.  I moved two static member variables into a method body,
but don't think that was the issue.

The issue I think was that for some reason, sometimes an Ngram wasn't contained in the table
of transition probabilities.  So the code now checks for this and sets the transition probability
to 0 when it happens.  Eugenie, please take a look and see if you agree.

I also added a test case that runs the tagger on Moby Dick and compares the output against
a gold standard, the gold standard being what the tagger produced before I fixed the issue.
 So I'm reasonably confident that I didn't change the semantics.  Note: the test case only
works if uimaj-core resides next to the tagger project, as I'm using the Moby Dick text from
the test resources of that project.  I was unable to figure out a way that would always work
without either copying moby.txt to the tagger project or making it part of our distribution
-- neither of which we want, I think.  So now if the test case doesn't find the text, it prints
a warning and moves on.  Since nobody will see the warning, this is less than ideal.  If anybody
has any bright ideas, let me know.


> Tagger throws occasional NPE
> ----------------------------
>
>                 Key: UIMA-1193
>                 URL: https://issues.apache.org/jira/browse/UIMA-1193
>             Project: UIMA
>          Issue Type: Bug
>          Components: Sandbox-Tagger
>    Affects Versions: 2.2.2
>            Reporter: Thilo Goetz
>            Assignee: Thilo Goetz
>             Fix For: 2.3S
>
>
> Tagger throws occasional NPE in Viterbi estimation.

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