Github user facaiy commented on the issue:
https://github.com/apache/spark/pull/17383
Sure, @WeichenXu123 , perhaps one or two weeks later, is it OK?
By the way, I think using sparse representation can only reduce memory
usage, and it is in the cost of compute performance. Hence, it cannot speed up
calculation for low-dimension data. The only advantage sparse representation
has is for super large dimension in my opinion.
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