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Aman Omer updated SPARK-29815: ------------------------------ Parent: SPARK-29818 Issue Type: Sub-task (was: Improvement) > Missing persist in ml.tuning.CrossValidator.fit() > ------------------------------------------------- > > Key: SPARK-29815 > URL: https://issues.apache.org/jira/browse/SPARK-29815 > Project: Spark > Issue Type: Sub-task > Components: ML > Affects Versions: 2.4.3 > Reporter: Dong Wang > Priority: Major > > dataset.toDF.rdd in ml.tuning.CrossValidator.fit(dataset: Dataset[_]) will > generate two rdds: training and validation. Some actions will be operated on > these two rdds, but dataset.toDF.rdd is not persisted, which will cause > recomputation. > {code:scala} > // Compute metrics for each model over each split > val splits = MLUtils.kFold(dataset.toDF.rdd, $(numFolds), $(seed)) // > dataset.toDF.rdd should be persisted > val metrics = splits.zipWithIndex.map { case ((training, validation), > splitIndex) => > val trainingDataset = sparkSession.createDataFrame(training, > schema).cache() > val validationDataset = sparkSession.createDataFrame(validation, > schema).cache() > {scala} > This issue is reported by our tool CacheCheck, which is used to dynamically > detecting persist()/unpersist() api misuses. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org