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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2067) Czech Stemmer
Date Sat, 28 Nov 2009 19:57:20 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783271#action_12783271
] 

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

Robert, I really like the readability in combination with the pseudo code in the paper! The
tests looking very good. The only thing I do not see in the paper is 
{code}
 if (len > 1 && s[len - 2] == 'e') {
      s[len - 2] = s[len - 1]; // e* > *
      return len - 1;
 }
{code}
 
durin the normalize stage. Maybe I miss something in the paper or this is some kind of optimisation.
If so would you add a comment? - would make it easier!
I also see no reason why the CzechStemFilter should be none final.



> 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
>
>
> 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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