Github user akopich commented on the issue:
https://github.com/apache/spark/pull/18924
@jkbradley, thank you for your comments! Please, check out the commit
adding the necessary docs.
Regarding tests: I believe, `OnlineLDAOptimizer alpha hyperparameter
optimization` from `mllib/clustering/LDASuite.scala` covers the piece of code
being rewritten. Or should there be tests of a different kind?
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