Github user thvasilo commented on a diff in the pull request:
https://github.com/apache/flink/pull/874#discussion_r33660212
--- Diff:
flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/common/ParameterMap.scala
---
@@ -112,7 +112,7 @@ object ParameterMap {
*
* @tparam T Type of parameter value associated to this parameter key
*/
-trait Parameter[T] {
+trait Parameter[+T] {
--- End diff --
This was initially needed to get the hack working, I will remove when I
rework the ParameterMap
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