Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/6339#discussion_r35821577
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala ---
@@ -151,4 +153,77 @@ 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 inverse
+ * should only be used on new columns such as predicted labels.
+ */
+ def invert(inputCol: String, outputCol: String):
StringIndexerInverseTransformer = {
+ val labelsCol: String = $(this.outputCol)
+ new StringIndexerInverseTransformer(labelsCol)
+ .setInputCol(inputCol)
+ .setOutputCol(outputCol)
+ }
+}
+
+/**
+ * :: Experimental ::
+ * Transform a provided column back to the original input types using the
metadata on the
+ * labelsCol. 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.
+ */
+@Experimental
+class StringIndexerInverseTransformer private[ml] (
+ override val uid: String,
+ val labelsCol: String) extends Transformer
--- End diff --
Cool, let me know if you'd like any help with 7424.
On Wed, Jul 29, 2015 at 3:53 PM, jkbradley <[email protected]> wrote:
> In mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala
> <https://github.com/apache/spark/pull/6339#discussion_r35821343>:
>
> > + new StringIndexerInverseTransformer(labelsCol)
> > + .setInputCol(inputCol)
> > + .setOutputCol(outputCol)
> > + }
> > +}
> > +
> > +/**
> > + * :: Experimental ::
> > + * Transform a provided column back to the original input types using
the metadata on the
> > + * labelsCol. 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.
> > + */
> > +@Experimental
> > +class StringIndexerInverseTransformer private[ml] (
> > + override val uid: String,
> > + val labelsCol: String) extends Transformer
>
> There is: SPARK-7424
>
> â
> Reply to this email directly or view it on GitHub
> <https://github.com/apache/spark/pull/6339/files#r35821343>.
>
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