Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/3890#issuecomment-69624254
@loachli OWLQN doesn't automatically solve the issue of
non-differentiability. As a result, you have to remove the L1 term from
HingeGradient, and use the Breeze's OWLQN l1reg instead. Check the constructor
of OWLQN object, you can pass in a value of l1reg or a function that specifies
which columns you want to regularize.
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