[jira] [Commented] (LUCENE-10408) Better dense encoding of doc Ids in Lucene91HnswVectorsFormat

["Julie Tibshirani (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-10408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500438#comment-17500438 ] 

Julie Tibshirani commented on LUCENE-10408:
-------------------------------------------

I noticed a failure in a test that was added:

{code}
./gradlew test --tests TestPerFieldKnnVectorsFormat.testVectorValuesReportCorrectDocs -Dtests.seed=333F2D9CC8DA43F5 -Dtests.multiplier=2 -Dtests.nightly=true -Dtests.slow=true
{code} 

 It looks like the checksums almost match, but not quite (maybe just a test issue?)
{code}
   >     java.lang.AssertionError: expected:<605.56494140625> but was:<605.5659790039062>
   >         at __randomizedtesting.SeedInfo.seed([333F2D9CC8DA43F5:B2FA0336857D5A3C]:0)
   >         at org.junit.Assert.fail(Assert.java:89)
   >         at org.junit.Assert.failNotEquals(Assert.java:835)
{code}

> Better dense encoding of doc Ids in Lucene91HnswVectorsFormat
> -------------------------------------------------------------
>
>                 Key: LUCENE-10408
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10408
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Mayya Sharipova
>            Assignee: Mayya Sharipova
>            Priority: Minor
>             Fix For: 9.1
>
>          Time Spent: 5h 40m
>  Remaining Estimate: 0h
>
> Currently we write doc Ids of all documents that have vectors as is.  We should improve their encoding either using delta encoding or bitset.



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