Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/3702#issuecomment-67089687
@srowen +1 for this functionality. It sounds handy for experts and
necessary for beginner users.
What do you think of using ```numBins``` instead of
```downsamplingFactor```? If I want to plot a ROC curve, I'd want to specify
the number of points in the curve instead of computing the downsampling factor.
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