Github user akopich commented on a diff in the pull request:
https://github.com/apache/spark/pull/18924#discussion_r142620788
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala ---
@@ -462,36 +462,55 @@ final class OnlineLDAOptimizer extends LDAOptimizer {
val expElogbetaBc = batch.sparkContext.broadcast(expElogbeta)
val alpha = this.alpha.asBreeze
val gammaShape = this.gammaShape
+ val optimizeDocConcentration = this.optimizeDocConcentration
--- End diff --
This line is necessary in order to avoid serialization of `LDASuite` which
is not serializable.
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