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https://issues.apache.org/jira/browse/LUCENE-9855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17374071#comment-17374071
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Dmitry Kan commented on LUCENE-9855:
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Usually, KNN is referred to the top K nearest neighbors found by an algorithm.
So it is an exact search in that sense.
ANN – is approximate nearest neighbors, inexact, and usually faster, trading
accuracy for speed. HNSW is ANN algorithm in this notation. Hope this helps.
> Reconsider names for ANN related format and APIs
> ------------------------------------------------
>
> Key: LUCENE-9855
> URL: https://issues.apache.org/jira/browse/LUCENE-9855
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Affects Versions: main (9.0)
> Reporter: Tomoko Uchida
> Priority: Blocker
> Fix For: main (9.0)
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> There is some discussion about the codec name for ann search.
> https://lists.apache.org/thread.html/r3a6fa29810a1e85779de72562169e72d927d5a5dd2f9ea97705b8b2e%40%3Cdev.lucene.apache.org%3E
> Main points here are 1) use plural form for consistency, and 2) use more
> specific name for ann search (second point could be optional).
> A few alternatives were proposed:
> - VectorsFormat
> - VectorValuesFormat
> - NeighborsFormat
> - DenseVectorsFormat
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