You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@lucene.apache.org by "Dawid Weiss (Resolved) (JIRA)" <ji...@apache.org> on 2011/11/16 13:16:52 UTC
[jira] [Resolved] (SOLR-2761) FSTLookup should use long-tail like
discretization instead of proportional (linear)
[ https://issues.apache.org/jira/browse/SOLR-2761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dawid Weiss resolved SOLR-2761.
-------------------------------
Resolution: Invalid
Fix Version/s: 4.0
3.6
3.5
Refactoring of FSTLookup API.
> FSTLookup should use long-tail like discretization instead of proportional (linear)
> -----------------------------------------------------------------------------------
>
> Key: SOLR-2761
> URL: https://issues.apache.org/jira/browse/SOLR-2761
> Project: Solr
> Issue Type: Improvement
> Components: spellchecker
> Affects Versions: 3.4
> Reporter: David Smiley
> Assignee: Dawid Weiss
> Priority: Minor
> Fix For: 3.5, 3.6, 4.0
>
>
> The Suggester's FSTLookup implementation discretizes the term frequencies into a configurable number of buckets (configurable as "weightBuckets") in order to deal with FST limitations. The mapping of a source frequency into a bucket is a proportional (i.e. linear) mapping from the minimum and maximum value. I don't think this makes sense at all given the well-known long-tail like distribution of term frequencies. As a result of this problem, I've found it necessary to increase weightBuckets substantially, like >100, to get quality suggestions.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org