Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/3890#issuecomment-98073658
@loachli hinge loss in linear svm is max(0, 1 - y*a'x) right ? Just replace
max with a smooth max and you should be able to smooth hinge gradient and then
it can be directly aggregated on master and solved by BFGS...smooth max has an
alpha that you can tune over iteration...start with a large lambda (smooth) and
tighten it as you go down...breeze already has smooth max and grad implemented
I think...
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