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From "Christian Moen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3767) Explore streaming Viterbi search in Kuromoji
Date Tue, 28 Feb 2012 09:41:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218026#comment-13218026
] 

Christian Moen commented on LUCENE-3767:
----------------------------------------

Mike,

Thanks a lot for this.  I've been taking this patch for a spin and I'm seeing some exceptions
being thrown when indexing some Wikipedia test documents.

I haven't had a chance to analyze this in detail, but when indexing the attached {{SolrXml-5498.xml}}
I'm getting:

{code}
java.lang.ArrayIndexOutOfBoundsException: -69
	at org.apache.lucene.util.RollingCharBuffer.get(RollingCharBuffer.java:98)
	at org.apache.lucene.analysis.kuromoji.KuromojiTokenizer.computePenalty(KuromojiTokenizer.java:236)
	at org.apache.lucene.analysis.kuromoji.KuromojiTokenizer.computeSecondBestThreshold(KuromojiTokenizer.java:227)
	at org.apache.lucene.analysis.kuromoji.KuromojiTokenizer.backtrace(KuromojiTokenizer.java:910)
	at org.apache.lucene.analysis.kuromoji.KuromojiTokenizer.parse(KuromojiTokenizer.java:567)
	at org.apache.lucene.analysis.kuromoji.KuromojiTokenizer.incrementToken(KuromojiTokenizer.java:394)
	at org.apache.lucene.analysis.kuromoji.TestKuromojiTokenizer.doTestBocchan(TestKuromojiTokenizer.java:567)
	at org.apache.lucene.analysis.kuromoji.TestKuromojiTokenizer.testBocchan(TestKuromojiTokenizer.java:528)
	...
{code}

I believe you can reproduce this by changing {{TestKuromojiTokenizer.doTestBocchan()}} to
read the attached {{SolrXml-5498.xml}} instead of {{bocchan.utf-8}}.


                
> Explore streaming Viterbi search in Kuromoji
> --------------------------------------------
>
>                 Key: LUCENE-3767
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3767
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/analysis
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 3.6, 4.0
>
>         Attachments: LUCENE-3767.patch, LUCENE-3767.patch, LUCENE-3767.patch, LUCENE-3767.patch,
SolrXml-5498.xml, compound_diffs.txt
>
>
> I've been playing with the idea of changing the Kuromoji viterbi
> search to be 2 passes (intersect, backtrace) instead of 4 passes
> (break into sentences, intersect, score, backtrace)... this is very
> much a work in progress, so I'm just getting my current state up.
> It's got tons of nocommits, doesn't properly handle the user dict nor
> extended modes yet, etc.
> One thing I'm playing with is to add a double backtrace for the long
> compound tokens, ie, instead of penalizing these tokens so that
> shorter tokens are picked, leave the scores unchanged but on backtrace
> take that penalty and use it as a threshold for a 2nd best
> segmentation...

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