Github user actuaryzhang commented on a diff in the pull request:
https://github.com/apache/spark/pull/17879#discussion_r115414436
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala ---
@@ -59,6 +59,29 @@ private[feature] trait StringIndexerBase extends Params
with HasInputCol with Ha
@Since("1.6.0")
def getHandleInvalid: String = $(handleInvalid)
+ /**
+ * Param for how to order labels of string column. The first label after
ordering is assigned
+ * an index of 0.
+ * Options are:
+ * - 'frequencyDesc': descending order by label frequency (most
frequent label assigned 0)
+ * - 'frequencyAsc': ascending order by label frequency (least
frequent label assigned 0)
+ * - 'alphabetDesc': descending alphabetical order
+ * - 'alphabetAsc': ascending alphabetical order
+ * Default is 'frequencyDesc'.
+ *
+ * @group param
+ */
+ @Since("2.3.0")
+ final val stringOrderType: Param[String] = new Param(this,
"stringOrderType",
+ "how to order labels of string column. " +
+ "The first label after ordering is assigned an index of 0. " +
+ s"Supported options:
${StringIndexer.supportedStringOrderType.mkString(", ")}.",
+ ParamValidators.inArray(StringIndexer.supportedStringOrderType))
--- End diff --
@felixcheung Right. It does not quite make sense to be case-sensitive now
given that we now use camel case.
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