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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-152) [PATCH] KStem for Lucene
Date Wed, 01 Jun 2011 16:24:47 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-152?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yonik Seeley updated LUCENE-152:
--------------------------------

    Attachment: lucid_kstem.tgz

OK folks, here's Lucid's optimized version of kstemmer.  Changes by Lucid to the original
kstemmer are being contributed under the ASL.

This is not a patch, but simply a tarball of Lucid's version.  Not sure what we want to do
with some of the stuff (like the biggish test files).

IIRC, there were two types of optimizations... one type was efficiency (i.e. using CharArrMap,
directly using a char[] in the stemmer, etc).  Other optimizations actually changed the logic
and code paths though, which is one reason I tested it over a whole document to ensure it
still matched the original.

> [PATCH] KStem for Lucene
> ------------------------
>
>                 Key: LUCENE-152
>                 URL: https://issues.apache.org/jira/browse/LUCENE-152
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/analysis
>    Affects Versions: unspecified
>         Environment: Operating System: other
> Platform: Other
>            Reporter: Otis Gospodnetic
>            Priority: Minor
>             Fix For: 3.3, 4.0
>
>         Attachments: lucid_kstem.tgz
>
>
> September 10th 2003 contributionn from "Sergio Guzman-Lara" <guzman@cs.umass.edu>
> Original email:
> Hi all,
>   I have ported the kstem stemmer to Java and incorporated it to 
> Lucene. You can get the source code (Kstem.jar) from the following website:
> http://ciir.cs.umass.edu/downloads/
>   Just click on "KStem Java Implementation" (you will need to register 
> your e-mail, for free of course, with the CIIR --Center for Intelligent 
> Information Retrieval, UMass -- and get an access code).
> Content of Kstem.jar:
> java/org/apache/lucene/analysis/KStemData1.java
> java/org/apache/lucene/analysis/KStemData2.java
> java/org/apache/lucene/analysis/KStemData3.java
> java/org/apache/lucene/analysis/KStemData4.java
> java/org/apache/lucene/analysis/KStemData5.java
> java/org/apache/lucene/analysis/KStemData6.java
> java/org/apache/lucene/analysis/KStemData7.java
> java/org/apache/lucene/analysis/KStemData8.java
> java/org/apache/lucene/analysis/KStemFilter.java
> java/org/apache/lucene/analysis/KStemmer.java
> KStemData1.java, ..., KStemData8.java   Contain several lists of words 
> used by Kstem
> KStemmer.java      Implements the Kstem algorithm 
> KStemFilter.java     Extends TokenFilter applying Kstem
> To compile
> unjar the file Kstem.jar to Lucene's "src" directory, and compile it 
> there. 
> What is Kstem?
>   A stemmer designed by Bob Krovetz (for more information see 
> http://ciir.cs.umass.edu/pubfiles/ir-35.pdf). 
> Copyright issues
>   This is open source. The actual license agreement is included at the 
> top of every source file.
>  Any comments/questions/suggestions are welcome,
>   Sergio Guzman-Lara
>   Senior Research Fellow
>   CIIR UMass

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