Github user sethah commented on the pull request:
https://github.com/apache/spark/pull/8112#issuecomment-198517789
@MLnick I agree that these PRs are similar, but I'm not sure there is
overlap. In the new pipeline component proposed in
[#11102](https://github.com/apache/spark/pull/11102) a single subsample is
taken from a dataframe. This PR involves K-fold cross validation and
train/validation split, which each involve taking non-overlapping splits of a
dataframe. 11102 is basically a pipeline component wrapper to `sampleByKey`
function on rdds. This PR could not use `sampleByKey` in its current state (as
far as I can tell) due to the non-overlapping subset requirement. I think both
have their uses, though I am not certain there is still interest in this PR. I
do appreciate any feedback.
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