Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/19599#discussion_r156555847
--- Diff: mllib/src/main/scala/org/apache/spark/ml/param/params.scala ---
@@ -435,6 +435,43 @@ class BooleanParam(parent: String, name: String, doc:
String) // No need for isV
}
}
+/**
+ * :: DeveloperApi ::
+ * Specialized version of `Param[String]` for Java.
+ */
+@DeveloperApi
+class StringParam(parent: Params, name: String, doc: String, isValid:
String => Boolean)
+ extends Param[String](parent, name, doc, isValid) {
+
+ private var options: Option[Array[String]] = None
--- End diff --
I would gladly make it a val. But met some problem for assigning the value
in the constructor. `this.options = Some(options)`, any advice?
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