viirya commented on a change in pull request #26247: [SPARK-29566][ML] Imputer
should support single-column input/output
URL: https://github.com/apache/spark/pull/26247#discussion_r367160760
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File path: mllib/src/main/scala/org/apache/spark/ml/feature/Imputer.scala
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@@ -205,6 +227,14 @@ class ImputerModel private[ml] (
import ImputerModel._
+ /** @group setParam */
+ @Since("3.0.0")
+ def setInputCol(value: String): this.type = set(inputCol, value)
Review comment:
I think the sanity check in Scala side for inputCol/outputCol and
inputCols/outputCols are more for preventing errors when mixing single and
multiple columns at the same time, e.g. set both single and multiple column
params, inputCol + outputCols...etc.
It sounds rarely switching between single/multiple column during fitting and
transforming.
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