Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/19337#discussion_r142853109
--- Diff: mllib/src/main/scala/org/apache/spark/ml/clustering/LDA.scala ---
@@ -224,6 +224,20 @@ private[clustering] trait LDAParams extends Params
with HasFeaturesCol with HasM
/**
* For Online optimizer only: [[optimizer]] = "online".
*
+ * @group expertParam
--- End diff --
parameter comments.
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