[
https://issues.apache.org/jira/browse/SOLR-17757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056973#comment-18056973
]
Uwe Schindler edited comment on SOLR-17757 at 2/6/26 8:01 PM:
--------------------------------------------------------------
Hi see here for the explanation what happened and why the new code is not
buggy: #8422 (comment)
The problem of people that have hit this was that their own similarity
implementation did not correctly implemented query normalization so IDF was
used twice. Actually there was no change in final scores, only how it was
calculated. In incomplete implementations this caused issues.
was (Author: thetaphi):
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?
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
