Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/6019#discussion_r30299831
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/Identifiable.scala
---
@@ -19,15 +19,24 @@ package org.apache.spark.ml.util
import java.util.UUID
+
/**
- * Object with a unique id.
+ * Trait for an object with an immutable unique ID that identifies itself
and its derivatives.
*/
-private[ml] trait Identifiable extends Serializable {
+trait Identifiable {
+
+ /**
+ * An immutable unique ID for the object and its derivatives.
--- End diff --
Good question! I don't think the `Identifiable` interface is user facing,
not developer facing either. The only useful function to developers is the
`randomUID` under `object Identifiable`.
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