Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19661
So why do you include the class such as
`org.apache.spark.ml.feature.Instance`.
You can look into a lot of algos, in `ml` package (not `mllib`), still use
something like `RDD[Instance]` and cache them, (these algos only interface use
dataframe). such as LinearRegression, LogisticRegression and so on.
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