amanomer commented on a change in pull request #26454: [SPARK-29818][MLLIB]
Missing persist on RDD
URL: https://github.com/apache/spark/pull/26454#discussion_r345570774
##########
File path:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
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@@ -138,6 +138,7 @@ final class EMLDAOptimizer extends LDAOptimizer {
this.docConcentration = if (docConcentration == -1) (50.0 / k) + 1.0 else
docConcentration
this.topicConcentration = if (topicConcentration == -1) 1.1 else
topicConcentration
val randomSeed = lda.getSeed
+ docs.persist()
Review comment:
`docs` is user input hence persist not required.
https://github.com/apache/spark/blob/80fbc382a60973db21367a922a0fb797e5ab382d/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDA.scala#L331
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