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[SPARK-29817][MLLIB] Missing persist on docs in mllib.clustering.LDAOptimizer.initialize #26448

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[SPARK-29817][MLLIB] Missing persist on docs in mllib.clustering.LDAOptimizer.initialize #26448

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1 change: 1 addition & 0 deletions mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
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Expand Up @@ -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()

// For each document, create an edge (Document -> Term) for each unique term in the document.
val edges: RDD[Edge[TokenCount]] = docs.flatMap { case (docID: Long, termCounts: Vector) =>
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