chsin opened a new issue #9755: Feature request: Update Core API
   The Core API's 
[IO]( isn't being 
updated to incude 
 which forces developers for the other languages to write equivalants. If 
`NDArrayIter` were in the Core API like `CSVIter`, `ImageRecordIter`, 
`MNISTIter`, etc, then it would be called by all languages through each 
language's MXDataIter wrapper. 
   `NDArrayiter` was first introduced as 
 by @sneakerkg in 2015, but evolved into a general numeric vector iterator that 
is useful in languages other than Python, such as in R, which defined but 
doesn't implement an [R 
 as seen in the comments:
    * \brief data iterator that takes a NumericVector
    *  Shuffles it and iterate over its content.
    *  TODO(KK, tq) implement this when have time.
    *  c.f. python/
   It would make more sense to have `NDArrayIter` in the Core, so it can be 
called by [R's MXDataIter 
 Then it could also be accessed by [Scala's MXDataIter 
 But instead, they had to code and test their own [Scala 
 The C++ API doesn?t even mention `NDArrayIter` and only has the [C++ 

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