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Posted to issues@lucene.apache.org by "Dawid Weiss (Jira)" <ji...@apache.org> on 2022/05/23 18:49:00 UTC
[jira] [Commented] (LUCENE-10590) Indexing all zero vectors leads to heat death of the universe
[ https://issues.apache.org/jira/browse/LUCENE-10590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17541100#comment-17541100 ]
Dawid Weiss commented on LUCENE-10590:
--------------------------------------
Love the title, [~sokolov]. Very Douglas-y Adams-y.
> Indexing all zero vectors leads to heat death of the universe
> -------------------------------------------------------------
>
> Key: LUCENE-10590
> URL: https://issues.apache.org/jira/browse/LUCENE-10590
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael Sokolov
> Priority: Major
>
> By accident while testing something else, I ran a luceneutil test indexing 1M 100d vectors where all the vectors were all zeroes. This caused indexing to take a very long time (~40x normal - it did eventually complete) and the search performance was similarly bad. We should not degrade by orders of magnitude with even the worst data though.
> I'm not entirely sure what the issue is, but perhaps as long as we keep finding hits that are "better" we keep exploring the graph, where better means (score, -docid) >= (lowest score, -docid). If that's right and all docs have the same score, then we probably need to either switch to > (but this could lead to poorer recall in normal cases) or introduce some kind of minimum score threshold?
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