Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7771#discussion_r35914268
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala ---
@@ -56,17 +56,26 @@ class OneHotEncoder(override val uid: String) extends
Transformer
new BooleanParam(this, "dropLast", "whether to drop the last category")
setDefault(dropLast -> true)
+ /**
+ * Param for the output attr prefix. If not specified, a prefix will be
automatically generated.
+ * @group param
+ */
+ final val outputAttrPrefix: Param[String] =
--- End diff --
We try to keep ML attributes handling under the hood. So this parameter
might be surprising to many users. Maybe we don't need to keep prefix and
`_is_` in the generated feature names. Instead of "country_is_US`, we can have
just `US` as the feature name, but under group `country` or whatever the output
column names is.
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