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https://issues.apache.org/jira/browse/SPARK-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269367#comment-15269367
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Nick Pentreath commented on SPARK-15027:
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Will take a look at repartitioning. 2.1 seems ok, I think there will be a
little too much to do with this for 2.0.
I created SPARK-15094 for the codegen error with a small example to reproduce.
> ALS.train should use DataFrame instead of RDD
> ---------------------------------------------
>
> Key: SPARK-15027
> URL: https://issues.apache.org/jira/browse/SPARK-15027
> Project: Spark
> Issue Type: Improvement
> Components: ML, PySpark
> Affects Versions: 2.0.0
> Reporter: Xiangrui Meng
>
> We should also update `ALS.train` to use `Dataset/DataFrame` instead of `RDD`
> to be consistent with other APIs under spark.ml and it also leaves space for
> Tungsten-based optimization.
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