Github user akopich commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19565#discussion_r146804206
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala ---
    @@ -497,40 +495,38 @@ final class OnlineLDAOptimizer extends LDAOptimizer 
with Logging {
           (u._1, u._2, u._3 + v._3)
         }
     
    -    val (statsSum: BDM[Double], logphatOption: Option[BDV[Double]], 
nonEmptyDocsN: Long) = stats
    +    val (statsSum: BDM[Double], logphatOption: Option[BDV[Double]], 
batchSize: Long) = stats
           .treeAggregate((BDM.zeros[Double](k, vocabSize), 
logphatPartOptionBase(), 0L))(
             elementWiseSum, elementWiseSum
           )
    --- End diff --
    
    Yes, that's right. But on the other hand, we've currently got a rather 
simple `treeAggregate` so it barely contributes to the complexity of the code. 
    
    Anyway, is it OK to fix this in this issue? 


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