Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/7976#discussion_r38384756
--- Diff: python/pyspark/ml/feature.py ---
@@ -931,6 +936,64 @@ class StringIndexerModel(JavaModel):
"""
Model fitted by StringIndexer.
"""
+ @property
+ def labels(self):
+ return self._java_obj.labels
+
+
+@inherit_doc
+class IndexToString(JavaTransformer, HasInputCol, HasOutputCol):
+ """
+ .. note:: Experimental
+ A [[Transformer]] that maps a column of string indices back to a new
column of corresponding
+ string values using either the ML attributes of the input column, or
if provided using the
+ labels supplied by the user.
+ All original columns are kept during transformation.
+ See L{StringIndexer} for converting strings into indices
+ """
+
+ # a placeholder to make the labels show up in generated doc
+ labels = Param(Params._dummy(), "labels",
+ "Optional labels to be provided by the user, if not
supplied column " +
--- End diff --
That makes less sense, if it isn't supplied then it uses the column
metadata.
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