Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1554#issuecomment-49965667
For unit tests, you can use bounds on the sample sizes. For example, there
are two strata with sizes 100 and 1000, and we are going to sample with
probabilities 0.5 and 0.1, respectively. The result sample sizes should be
roughly around [30, 70] and [70, 130].
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