[SPARK-16260][ML][Example]:PySpark ML Example Improvements and Cleanup #14021
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What changes were proposed in this pull request?
1). Remove unused import in Scala example;
2). Move spark session import outside example off;
3). Change parameter setting the same as Scala;
4). Change comment to be consistent;
5). Make sure that Scala and python using the same data set;
I did one pass and fixed the above issues. There are missing examples in python, which might be added later.
TODO: For some examples, there are comments on how to run examples; But there are many missing. We can add them later.
How was this patch tested?
(Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)
Manually test them