Github user rxin commented on the pull request:
https://github.com/apache/incubator-spark/pull/572#discussion_r9802309
```scala
(1 to numFolds).map { fold =>
val sampler = new BernoulliSampler[T]((fold-1)/foldsF,fold/foldsF,
complement = false)
val train = new PartitionwiseSampledRDD(rdd, sampler , seed)
val test = new PartitionwiseSampledRDD(rdd, sampler , seed.complement)
// might need to create this
(train, test)
}
```
Make sure you rename folds to numFolds.
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