Github user johnc1231 commented on the issue:
https://github.com/apache/spark/pull/17459
@viirya
Gonna fix that last test tonight, but just doing a quick timing on my
laptop, (2014 Macbook Pro with 2.2Hz i7), the difference was as follows on a
10k by 10k matrix of random doubles between 0 and 1:
New method: 113837 ms
Old method: 167853 ms
So it's clearly better in the dense case. Will benchmark sparse tonight as
well.
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