Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/6339#discussion_r35581866
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala ---
@@ -151,4 +167,64 @@ class StringIndexerModel private[ml] (
val copied = new StringIndexerModel(uid, labels)
copyValues(copied, extra)
}
+
+ /**
+ * Return a model to perform the inverse transformation.
+ * Note: by default we keep the original columns during this
transformation
+ * so the invert should only be needed if you do something beyond simply
+ * applying the original transformation.
+ */
+ def invert(): StringIndexerInvertModel = {
--- End diff --
We should force the user to specify an output column here. The default
behavior will cause failures since the inverse-indexed column will already
exist.
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