Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/1964#issuecomment-53149119
BYW, I checked the performance of Math.abs() and breeze.numerics.abs.
It seems that Math.abs() performs better than breeze.numerics.abs.
A performs better than B.
https://gist.github.com/yu-iskw/518a48a68ef368998058
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