Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/14898
@srowen I research the implements about BLAS on this, and it shows that
level-1 blas operation using loop is fast enough and there is no need to use
specific cpu instructions. but here breeze use `cForRange`(a native implement
for loop) to do the loop instead of `while` in scala. But currently performance
tests between the two ways show no big difference so I would like to keep the
code as it is for now. thanks~
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