Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/6339#discussion_r35581885 --- 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 = { + new StringIndexerInvertModel(uid, labels) + .setInputCol(getOutputCol) + .setOutputCol(getInputCol) + } +} + +class StringIndexerInvertModel private[ml] ( --- End diff -- "StringIndexerInvertModel" --> "StringIndexerInverseModel"
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