mikemccand commented on issue #15773:
URL: https://github.com/apache/lucene/issues/15773#issuecomment-4045704684

   Also, I think this was @msokolov idea maybe: simple set-overlap recall is a 
dangerous metric because it doesn't reflect vectors whose scores are really 
close.  So if I get totally different vectors, but their scores were very close 
to the previous set of vectors, that shouldn't really count as 0% recall.  Are 
there known improvements to recall, "score weighted recall" or so, to take this 
into account somehow...?  One workaround is to report recall@N with many N 
values -- once N gets beyond those "nearly the same distance" set of result 
vectors, recall rises, vs the smaller Ns...


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