Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/18924#discussion_r143080051
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala ---
@@ -462,31 +463,60 @@ final class OnlineLDAOptimizer extends LDAOptimizer {
val expElogbetaBc = batch.sparkContext.broadcast(expElogbeta)
val alpha = this.alpha.asBreeze
val gammaShape = this.gammaShape
-
- val stats: RDD[(BDM[Double], List[BDV[Double]])] = batch.mapPartitions
{ docs =>
+ val optimizeDocConcentration = this.optimizeDocConcentration
+ // If and only if optimizeDocConcentration is set true,
+ // we calculate logphat in the same pass as other statistics.
+ // No calculation of loghat happens otherwise.
+ val logphatPartOptionBase = () => if (optimizeDocConcentration) {
--- End diff --
Not an style expert myself. Just what I would use:
```
val logphatPartOptionBase = () => {
if (optimizeDocConcentration) Some(BDV.zeros[Double](k)) else None
}
```
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