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https://issues.apache.org/jira/browse/LUCENE-7996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16649548#comment-16649548
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Yonik Seeley commented on LUCENE-7996:
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Ah, I see. Thanks for the pointer!
> Should we require positive scores?
> ----------------------------------
>
> Key: LUCENE-7996
> URL: https://issues.apache.org/jira/browse/LUCENE-7996
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: master (8.0)
>
> Attachments: LUCENE-7996.patch, LUCENE-7996.patch, LUCENE-7996.patch
>
>
> Having worked on MAXSCORE recently, things would be simpler if we required
> that scores are positive. Practically, this would mean
> - forbidding/fixing similarities that may produce negative scores (we have
> some of them)
> - forbidding things like negative boosts
> So I'd be curious to have opinions whether this would be a sane requirement
> or whether we need to be able to cope with negative scores eg. because some
> similarities that we want to support produce negative scores by design.
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