Github user sethah commented on the issue:
https://github.com/apache/spark/pull/14937
A small update: I have run a few tests on a refactored version of this
patch which avoids some data copying. I have found at least one case where the
current patch is faster, but many where it is not. I'll try to post formal
results at some point. (All test cases using dense data btw)
In the meantime, I think it would be helpful to have more detail about the
tests above. They are rather small datasets. How many centers were used? How
were the timings observed? Thanks!
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