[jira] [Commented] (SOLR-17757) TFIDFSimilarity scoring difference between version 5.5.4 and 8.9.0

["Uwe Schindler (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-17757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056973#comment-18056973 ] 

Uwe Schindler commented on SOLR-17757:
--------------------------------------

Hi see here for the explanation what happened and why the new code is not buggy: https://github.com/apache/lucene/issues/8422#issuecomment-1223722482

The problem of people that gave hit this was that their implementation did not correctly implemented query normalization so IDF was used twice.

> TFIDFSimilarity scoring difference between version 5.5.4 and 8.9.0
> ------------------------------------------------------------------
>
>                 Key: SOLR-17757
>                 URL: https://issues.apache.org/jira/browse/SOLR-17757
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>            Reporter: parveen saini
>            Priority: Critical
>              Labels: TFIDF, similarity
>         Attachments: image-2025-06-04-23-42-47-309.png, image-2025-06-04-23-42-47-382.png
>
>
> On migrating solr version from 5.5.4 to 8.9.0 I noticed that TFIDFSimilarity scoring is different and results in different overall score for the query.
> On digging deeper I found idf is factored twice in version 5.5.4 which is causing the issue. Is the change in version 8.9.0 intentional?



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