Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/1290#issuecomment-67429185
You're right that optimization APIs are not great currently. The changes
you suggest (removing private[mllib] and changing the Optimizer APIs) should be
done at some point, but they would require a fair amount of design and coding.
A good plan might be:
* For now, do not expose an optimizer parameter. Only allow one (LBFGS?).
* A later PR can improve the Optimizer APIs.
* A later PR can add an optimizer parameter to ANN.
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