Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/8152#discussion_r36932669
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala ---
@@ -172,14 +172,11 @@ class StringIndexerModel private[ml] (
}
/**
- * Return a model to perform the inverse transformation.
- * Note: By default we keep the original columns during this
transformation, so the inverse
- * should only be used on new columns such as predicted labels.
+ * Return a [[IndexToString]] instance to perform the inverse
transformation, mapping indices back
+ * to their string values.
--- End diff --
I think it's useful to provide some comment to the effect that this inverse
should be used to convert predicted indices back to labels (though I agree the
wording can be improved).
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