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Posted to dev@lucene.apache.org by "David Mark Nemeskey (JIRA)" <ji...@apache.org> on 2011/08/02 10:18:27 UTC
[jira] [Updated] (LUCENE-3220) Implement various ranking models as
Similarities
[ https://issues.apache.org/jira/browse/LUCENE-3220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Mark Nemeskey updated LUCENE-3220:
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Attachment: LUCENE-3220.patch
Added norm decoding table to EasySimilarity, and removed sumTotalFreq. Sorry I could only upload this patch now but I didn't have time to work on Lucene the last week.
As I see, all the problems you mentioned have been corrected, so maybe we can go on with the review?
> Implement various ranking models as Similarities
> ------------------------------------------------
>
> Key: LUCENE-3220
> URL: https://issues.apache.org/jira/browse/LUCENE-3220
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: core/search
> Affects Versions: flexscoring branch
> Reporter: David Mark Nemeskey
> Assignee: David Mark Nemeskey
> Labels: gsoc
> Attachments: LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch, LUCENE-3220.patch
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> With [LUCENE-3174|https://issues.apache.org/jira/browse/LUCENE-3174] done, we can finally work on implementing the standard ranking models. Currently DFR, BM25 and LM are on the menu.
> Done:
> * {{EasyStats}}: contains all statistics that might be relevant for a ranking algorithm
> * {{EasySimilarity}}: the ancestor of all the other similarities. Hides the DocScorers and as much implementation detail as possible
> * _BM25_: the current "mock" implementation might be OK
> * _LM_
> * _DFR_
> * The so-called _Information-Based Models_
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