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Date: Sun, 29 Nov 2009 11:54:20 +0000 (UTC)
From: "Simon Willnauer (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2067) Czech Stemmer
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    [ https://issues.apache.org/jira/browse/LUCENE-2067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783389#action_12783389 ] 

Simon Willnauer commented on LUCENE-2067:
-----------------------------------------

bq. make the stem filter final, and add explicit test for the mobile e rewrite 
looks good to me! Go ahead and commit.

bq. Sorry for the confusion (pointing you at a slightly different algorithm)... 
well at least I figured out there must be something wrong :)


> Czech Stemmer
> -------------
>
>                 Key: LUCENE-2067
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2067
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/analyzers
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-2067.patch, LUCENE-2067.patch, LUCENE-2067.patch, LUCENE-2067.patch
>
>
> Currently, the CzechAnalyzer is merely stopwords, and there isn't a czech stemmer in snowball.
> This patch implements the light stemming algorithm described in: http://portal.acm.org/citation.cfm?id=1598600
> In their measurements, it improves MAP 42%
> The analyzer does not use this stemmer if LUCENE_VERSION <= 3.0, for back compat.

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