Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/10434#issuecomment-166642164
This isn't quite how we report issues or suggest changes. Please read
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark first.
This is just an example of getting metrics, so the test/train split isn't
as important. Still it is showing evaluating metrics and another example in
isotonic_regression_example.py does do a test/train split. You might follow its
example. Look for other similar examples that should be standardized in this
way.
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