Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/7976#discussion_r37252845
--- Diff: python/pyspark/ml/feature.py ---
@@ -760,6 +765,60 @@ class StringIndexerModel(JavaModel):
"""
Model fitted by StringIndexer.
"""
+ @property
+ def labels(self):
+ return self._java_obj.labels
+
+
+class IndexToString(JavaTransformer, HasInputCol, HasOutputCol):
+ """
+ Convert provided indexes back to strings using either the metadata on
the input column
+ or user provided labels.
+ Note: By default we keep the original columns during
StringIndexerModel's transformation,
+ so the inverse should only be used on new columns such as predicted
labels.
+ """
+ # a placeholder to make the labels show up in generated doc
--- End diff --
insert newline above
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