srowen commented on a change in pull request #27261: [SPARK-30503][ML]
OnlineLDAOptimizer does not handle persistance correctly
URL: https://github.com/apache/spark/pull/27261#discussion_r369587320
##########
File path:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
##########
@@ -211,11 +211,14 @@ final class EMLDAOptimizer extends LDAOptimizer {
val docTopicDistributions: VertexRDD[TopicCounts] =
graph.aggregateMessages[(Boolean, TopicCounts)](sendMsg, mergeMsg)
.mapValues(_._2)
+ val prevGraph = graph
Review comment:
@zhengruifeng I'm still kind of curious, but trust your judgment so I will
merge it.
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