Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/17862
+1 @WeichenXu123 IIRC softmax regression also include a non-derivable
point, we can use LBFGS to solve it as well. We can support _squared hinge
loss_ which is smooth function in the future, so users can switch to _squared
hinge loss_ if they hit the condition with little probability.
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