Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/1964#issuecomment-53012573
> one brief comment: with breeze vectors you can say abs(v) instead of
v.map(Math.abs(_))
Sorry, I can't find abs API for a vector in Breeze API documentation.
http://www.scalanlp.org/api/breeze/#breeze.numerics.package$$abs$
Manhattan distance requres max values for each abs() element in a vector.
So I think that we shouldn't use import breeze.numerics.abs.
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