Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/5596#issuecomment-94618313
A few initial thoughts:
* ```learningRate```: This is the same as ```stepSize```. We should
probably only use one of the two. I'm OK with either but would vote for
```stepSize``` if I had to choose since that's more common in the optimization
literature, which is ML is referencing more and more. Ping @mengxr -- opinions?
* Very good point about the different input column types. I'm adding a
note to the JIRA about it since it's a design issue we should discuss a little.
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