Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4504#discussion_r25232683
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala
---
@@ -39,3 +39,66 @@ class Tokenizer extends UnaryTransformer[String,
Seq[String], Tokenizer] {
override protected def outputDataType: DataType = new
ArrayType(StringType, false)
}
+
+
+/**
+ * :: AlphaComponent ::
+ * A regex based tokenizer that extracts tokens using a regex.
+ * Optional additional parameters include enabling lowercase
stabdarization, a minimum character
+ * size for tokens as well as an array of stop words to remove from the
results.
+ */
+@AlphaComponent
+class RegexTokenizer extends UnaryTransformer[String, Seq[String],
RegexTokenizer] {
+
+ val lowerCase = new BooleanParam(this,
--- End diff --
Add doc with `@group param` to group methods in the generated html doc,
e.g.,
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/param/sharedParams.scala#L65
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