Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11812#issuecomment-212921574
The result here is a similarity rather than a distance. It should never be
more than 1, unless there's a bug, because it's a cosine similarity. I can see
here a case where it would jump straight to infinity, but not sure how it would
be > 1 and increasing. Are you sure or can you reproduce that?
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