Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/3890#issuecomment-68912504
Since hinge loss in SVM is not differentiable around zero, L-BFGS will not
work correctly. You need to use OWLQN to address the non-differentiable issue.
PS, I tried to address this with generalized regularizer in SPARK-2505, see
#1518
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