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

    https://github.com/apache/spark/pull/12176#discussion_r58553056
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala ---
    @@ -440,12 +440,9 @@ final class OnlineLDAOptimizer extends LDAOptimizer {
           val stat = BDM.zeros[Double](k, vocabSize)
           var gammaPart = List[BDV[Double]]()
           nonEmptyDocs.foreach { case (_, termCounts: Vector) =>
    -        val ids: List[Int] = termCounts match {
    -          case v: DenseVector => (0 until v.size).toList
    -          case v: SparseVector => v.indices.toList
    -        }
    +        val ids: List[Int] = LDAUtils.vectorAsList(termCounts)
    --- End diff --
    
    Yes I agree. It is better to simply return `ids` rather than having callers 
to compute it. I will make that change.


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