jbellis opened a new pull request, #12281:
URL: https://github.com/apache/lucene/pull/12281

   Cosine of two equal vectors is exactly 1, but we're losing too much 
precision on large-dimension vectors and ending up with NaN.  (Presumably this 
does bad things for vectors that are not exactly equal as well.)
   
   This PR adds error checking (if similarity results in NaN or infinity, try 
to show where it came from), adds a failing test, and updates the similarity 
functions to use double precision math internally.  (They continue to return 
float; the signatures do not change.)


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