Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/17076
@sethah Thanks for the good catch. I verified this optimization and found
it indeed reduced the size of shuffle data. This looks good to me. BTW, like
@MLnick 's suggestion, could you add the lazy evaluation for gradient array to
all other aggregators in this PR? Since it's little change, I'd prefer to
modify it here. Thanks.
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