Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/4419#issuecomment-77060378
As far as understanding the code, it's really more for the benefit of
future developers than for me. Sticking with the layout in Hoffman's code is
fine with me, but I suspect we'll refactor to use general gradient-based
optimization methods at some point in the future.
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