Github user srowen commented on the issue:
https://github.com/apache/spark/pull/16038
Yes, but the result is inherently dense -- not going to be many zeroes in
the gradient if any. There's no way around that. The discussion has been about
the initial value, the zero vector, right? That you agree is sparse. I don't
see what the problem is then. A huge sparse 0 vector is _not_ huge when
serialized.
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