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https://issues.apache.org/jira/browse/LUCENE-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13862335#comment-13862335
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ASF subversion and git services commented on LUCENE-5379:
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Commit 1555360 from [~rcmuir] in branch 'dev/branches/branch_4x'
[ https://svn.apache.org/r1555360 ]
LUCENE-5379: Kurdish Analyzer
> Kurdish Analyzer
> ----------------
>
> Key: LUCENE-5379
> URL: https://issues.apache.org/jira/browse/LUCENE-5379
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Robert Muir
> Fix For: 5.0, 4.7
>
> Attachments: LUCENE-5379.patch, ckbtestdata.zip
>
>
> Normalizer+Stemmer+Stopwords for Sorani kurdish (written in the arabic
> script).
> The most important piece is the normalization: this varies wildly in practice.
> The stemmer is a light stemmer, very simple and not aggressive at all.
> I tested against the pewan test collection, see:
> *
> http://eng.uok.ac.ir/esmaili/research/klpp/downloads/publications/AICCSA2013.pdf
> * http://eng.uok.ac.ir/esmaili/research/klpp/en/downloads.htm
> baseline is StandardAnalyzer.
> ||short queries (T)||TFIDF||BM25||I(ne)B2||
> |baseline|0.2355|0.2473|0.2702|
> |patch|0.2930 (+24%)|0.3163 (+28%)|0.3309 (+22%)|
> ||long queries (D)||TFIDF||BM25||I(ne)B2||
> |baseline|0.3111|0.3185|0.3547|
> |patch|0.4060 (+31%)|0.4422 (+39%)|0.4800 (+35%)|
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