[SPARK-29815][ML] Missing persist in ml.tuning.CrossValidator.fit() #26450
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Can one of the admins verify this patch? |
amanomer
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What changes were proposed in this pull request?
Use persist on RDD which is used for more than one action.
Why are the changes needed?
RDD
dataset.toDF.rddwill generate two rdds: training and validation. Some actions will be operated on these two rdds, butdataset.toDF.rddis not persisted, which will cause re-computation.Does this PR introduce any user-facing change?
No
How was this patch tested?
Tested manually