Github user mpjlu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19337#discussion_r144060858
--- Diff: mllib/src/main/scala/org/apache/spark/ml/clustering/LDA.scala ---
@@ -224,6 +224,24 @@ private[clustering] trait LDAParams extends Params
with HasFeaturesCol with HasM
/**
* For Online optimizer only: [[optimizer]] = "online".
*
+ * A (positive) learning parameter that controls the convergence of
variational inference.
+ * Smaller value will lead to more accuracy model and longer training
time.
--- End diff --
Thanks, I will update the doc.
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