Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3536#issuecomment-98982486
I have not benchmarked these since neither is a "correct" answer to
benchmark against the other. The cosine similarity isn't really that valid in
the original feature space. It might still be interesting to know how different
the answers are but they're probably going to be fairly different on purpose.
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