nswamy commented on a change in pull request #11844: [MXNET-689] add DataDesc 
type for the Scala Package
URL: https://github.com/apache/incubator-mxnet/pull/11844#discussion_r209801084
 
 

 ##########
 File path: 
scala-package/core/src/main/scala/org/apache/mxnet/io/NDArrayIter.scala
 ##########
 @@ -42,27 +43,40 @@ import scala.collection.immutable.ListMap
 class NDArrayIter(data: IndexedSeq[(String, NDArray)],
                   label: IndexedSeq[(String, NDArray)],
                   private val dataBatchSize: Int, shuffle: Boolean,
-                  lastBatchHandle: String) extends DataIter {
-
+                  lastBatchHandle: String,
+                  dataDType: DType, labelDType: DType,
+                  dataLayout: String, labelLayout: String) extends DataIter {
+
+  // scalastyle:off
+  def this(data: IndexedSeq[NDArray], label: IndexedSeq[NDArray],
+           dataBatchSize: Int, shuffle: Boolean,
+           lastBatchHandle: String,
+           dataName: String, labelName: String,
+           dataDType: DType, labelDType: DType,
+           dataLayout: String, labelLayout: String) {
+    this(IO.initData(data, allowEmpty = false, dataName),
 
 Review comment:
   how about changing/adding API for `initData` that will give you 
`IndexedSeq[DataDesc]` instead of `IndexedSeq[(String, NDArray)]
   `initData` seems to be giving the default names for Inputs and labels.
   
   ```
   private def initDataDesc(data: Indexed[ND]): Indexed[DataDesc]
   ```

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