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Posted to issues@opennlp.apache.org by "William Colen (JIRA)" <ji...@apache.org> on 2011/07/27 16:05:09 UTC
[jira] [Commented] (OPENNLP-238) BestSequence method in BeamSearch
can cause NullPointerException if it can not find a valid sequence
[ https://issues.apache.org/jira/browse/OPENNLP-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13071742#comment-13071742 ]
William Colen commented on OPENNLP-238:
---------------------------------------
Any comment on this? I tried it here and it looks ok, but I am not a specialist on the BeamSearch class.
> BestSequence method in BeamSearch can cause NullPointerException if it can not find a valid sequence
> ----------------------------------------------------------------------------------------------------
>
> Key: OPENNLP-238
> URL: https://issues.apache.org/jira/browse/OPENNLP-238
> Project: OpenNLP
> Issue Type: Bug
> Components: POS Tagger
> Affects Versions: tools-1.5.2-incubating
> Reporter: William Colen
> Assignee: William Colen
> Fix For: tools-1.5.2-incubating
>
>
> I am using the standard sequence validator of POS Tagger with a TagDictionary. Sometimes there are no outcome that matches with the tags in the dictionary. That is causing a NullPointerException in bestSequence method.
> I think we should add an extra validation: if the heap 'next' still empty after advancing all valid sequences (line 159) we should let it advance invalid sequences. It would make the POS Tagger more robust.
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