Github user Lewuathe commented on the pull request:
https://github.com/apache/spark/pull/1290#issuecomment-67475009
I agree with @jkbradley.
> For now, do not expose an optimizer parameter. Only allow one (LBFGS?).
Changing scope of each API should be done considerably. In this case it is
the tradeoff between publicity of optimizers and usability of ANN. ANN
currently seems to require LBFGS therefore only making it public is the
reasonable way.
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