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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-5379) Kurdish Analyzer
Date Sun, 29 Dec 2013 07:08:51 GMT
Robert Muir created LUCENE-5379:
-----------------------------------

             Summary: 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


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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