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Date: Thu, 4 Aug 2011 20:04:27 +0000 (UTC)
From: "David Mark Nemeskey (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Issue Comment Edited] (LUCENE-3220) Implement various
 ranking models as Similarities
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    [ https://issues.apache.org/jira/browse/LUCENE-3220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079555#comment-13079555 ] 

David Mark Nemeskey edited comment on LUCENE-3220 at 8/4/11 8:04 PM:
---------------------------------------------------------------------

Deleted the accidentally forgotten abstract modifier from the Distribution classes.

      was (Author: david_nemeskey):
    Deleted the accidentally forgot abstract modifier from the Distribution classes.
  
> 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/query/scoring, core/search
>    Affects Versions: flexscoring branch
>            Reporter: David Mark Nemeskey
>            Assignee: David Mark Nemeskey
>              Labels: gsoc, gsoc2011
>         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, 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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