Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/871#discussion_r34131445
--- Diff:
flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/package.scala ---
@@ -70,6 +70,15 @@ package object ml {
dataSet.map(new BroadcastSingleElementMapperWithIteration[T, B,
O](dataSet.clean(fun)))
.withBroadcastSet(broadcastVariable, "broadcastVariable")
}
+
+ /** Calculates the mean value of a DataSet[T <\: Numeric[T]]
+ *
+ * @return A DataSet[Double] with the mean value as its only element
+ */
+ def mean()(implicit num: Numeric[T], ttit: TypeInformation[(T, Int)]):
DataSet[Double] =
--- End diff --
I think this method should be placed in a `NumericRichDataSet[T: Numeric]`
class. Otherwise we provide a `mean` method for `DataSets` whose element type
does not support this operation. This might be misleading IMO.
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