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From "David Mark Nemeskey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3220) Implement various ranking models as Similarities
Date Tue, 21 Jun 2011 11:49:47 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Mark Nemeskey updated LUCENE-3220:
----------------------------------------

    Attachment: LUCENE-3220.patch

Done.

> 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
>
>   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.
> TODO:
>  * {{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_
> Done:

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