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From "John Wang (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3364) Add score threshold into Scorer.score()
Date Thu, 13 Oct 2011 18:55:12 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126803#comment-13126803
] 

John Wang commented on LUCENE-3364:
-----------------------------------

Thanks Robert for the pointer!
I don't see how this would work (help appreciated!), the problem I am trying to get around
is for the collector to provide a threshold score and my scoring function would decide based
on this threshold. How would I obtain such threshold from the range?

Thanks

-John
                
> Add score threshold into Scorer.score()
> ---------------------------------------
>
>                 Key: LUCENE-3364
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3364
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/query/scoring
>            Reporter: John Wang
>
> This is an optimization for scoring.
> Given a Scorer.score() implementation, where features are gathered to calculate a score.
> Proposal, add a parameter to score, e.g. score(float threshold)
> This threshold is the minimum score to "beat" to make it to the current PriorityQueue.
This could potential save a great deal of wasted calculation in the cases where recall is
large.
> In our case specifically, some of the features needed to do calculation can be expensive
to obtain, it would be nice to have a place to decide whether or not even fetching these features
are necessary.
> Also, if we know the score would be low, simply threshold can be returned.
> Let me know if this makes sense and I can work on a patch.

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