[SPARK-11978] [ML] Move dataset_example.py to examples/ml and rename to dataframe_example.py #9957
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Since
Dataset
has a new meaning in Spark 1.6, we should rename it to avoid confusion.#9873 finished the work of Scala example, here we focus on the Python one.
Move dataset_example.py to
examples/ml
and rename todataframe_example.py
.BTW, fix minor missing issues of #9873.
cc @mengxr