Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/17324#discussion_r108156614
--- Diff: docs/ml-features.md ---
@@ -1284,6 +1284,64 @@ for more details on the API.
</div>
+
+## Imputer
+
+The `Imputer` transformer completes missing values in the dataset, either
using the mean or the
+median of the columns in which the missing value are located. The input
columns should be of
+`DoubleType` or `FloatType`. Currently `Imputer` does not support
categorical features and possibly
+creates incorrect values for a categorical feature.
--- End diff --
"... creates incorrect values for columns containing categorical features."
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