Github user dorx commented on the pull request:
https://github.com/apache/spark/pull/1554#issuecomment-49958757
I added `#doctest: +SKIP` for the unit because the unit in `sample` also
has it. I'm guessing this is because of the difference in behavior when numpy
is used vs. not. It ran and passed the unit on my machine without `#doctest:
+SKIP`.
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