Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19876#discussion_r176821060
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
@@ -86,7 +88,80 @@ private[util] sealed trait BaseReadWrite {
}
/**
- * Abstract class for utility classes that can save ML instances.
+ * Implemented by objects that provide ML exportability.
+ *
+ * A new instance of this class will be instantiated each time a save call
is made.
+ *
+ * Must have a valid zero argument constructor which will be called to
instantiate.
+ *
+ * @since 2.3.0
--- End diff --
Need to update since annotations to 2.4.0
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