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Posted to dev@lucene.apache.org by "Ron Mayer (JIRA)" <ji...@apache.org> on 2010/07/05 02:34:52 UTC
[jira] Commented: (LUCENE-2230) Lucene Fuzzy Search: BK-Tree can
improve performance 3-20 times.
[ https://issues.apache.org/jira/browse/LUCENE-2230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885087#action_12885087 ]
Ron Mayer commented on LUCENE-2230:
-----------------------------------
Could this or a similar technique improve searches for things that use both leading and trailing wildcards - like a search for '*ildcar*'?
> Lucene Fuzzy Search: BK-Tree can improve performance 3-20 times.
> ----------------------------------------------------------------
>
> Key: LUCENE-2230
> URL: https://issues.apache.org/jira/browse/LUCENE-2230
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 3.0
> Environment: Lucene currently uses brute force full-terms scanner and calculates distance for each term. New BKTree structure improves performance in average 20 times when distance is 1, and 3 times when distance is 3. I tested with index size several millions docs, and 250,000 terms.
> New algo uses integer distances between objects.
> Reporter: Fuad Efendi
> Attachments: BKTree.java, Distance.java, DistanceImpl.java, FuzzyTermEnumNEW.java, FuzzyTermEnumNEW.java
>
> Original Estimate: 0.02h
> Remaining Estimate: 0.02h
>
> W. Burkhard and R. Keller. Some approaches to best-match file searching, CACM, 1973
> http://portal.acm.org/citation.cfm?doid=362003.362025
> I was inspired by http://blog.notdot.net/2007/4/Damn-Cool-Algorithms-Part-1-BK-Trees (Nick Johnson, Google).
> Additionally, simplified algorythm at http://www.catalysoft.com/articles/StrikeAMatch.html seems to be much more logically correct than Levenstein distance, and it is 3-5 times faster (isolated tests).
> Big list od distance implementations:
> http://www.dcs.shef.ac.uk/~sam/stringmetrics.htm
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