Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11812#issuecomment-212822658
Is the problem that the input vector may have a very large norm, causing
the dot product with other vectors to be Infinity? There's a little, opposite
problem: dividing by a very small norm upfront might introduce a fair bit of
imprecision in the result. It's the simpler thing to do and better some
imprecision (in a context where it's not all that essential) than bad results.
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