Github user MLnick commented on the pull request:
https://github.com/apache/spark/pull/3536#issuecomment-66331985
I'd agree that cosine similarity is preferred. Can't really think of a case
where I've *not* used cosine sim for a similar items or similar users
computation. Of course, it could be added as an option potentially (whether to
use cosine sim - default - or plain dot product.
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