Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/3643#issuecomment-67620316
Thanks @mengxr. Not quite familiar with breeze. But as I roughly go through
distance metric implementations of breeze. They are following the same pattern
that employs zip operation. This way can address distance metric problem in a
consistent approach. But the efficiency might be not its main consideration.
That seems to be matching with the goal of breeze project to be *generic,
clean, and powerful without sacrificing (much) efficiency*. To adopt this
optimization in breeze will inevitably contradict breeze's principle and
design. As I can see, this optimization may not easily go into breeze. That is
my rough idea.
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