[jira] [Commented] (LUCENE-9071) Speed up computation of BM25 scores

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-9071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16991818#comment-16991818 ] 

ASF subversion and git services commented on LUCENE-9071:
---------------------------------------------------------

Commit c413656b627160d49eb9e9f1f84ec4945db80f0e in lucene-solr's branch refs/heads/master from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=c413656 ]

LUCENE-9071: Speed up BM25 scores. (#1043)




> Speed up computation of BM25 scores
> -----------------------------------
>
>                 Key: LUCENE-9071
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9071
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> We changed the way BM25 scores are computed in LUCENE-7997 in order to guarantee monotonicity of scores, but this translated to a small decrease of throughput, see annotation CC (October 2017) on Mike's nightly benchmarks. Even though the total number of score computations has decreased since we introduced block-max WAND, its relative cost is not negligible since we not only compute scores on collected documents, but also when decoding skip lists in order to compute the maximum score per block, or group of blocks.



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