Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/19993#discussion_r162717263
--- Diff: mllib/src/main/scala/org/apache/spark/ml/param/params.scala ---
@@ -166,6 +167,8 @@ private[ml] object Param {
@DeveloperApi
object ParamValidators {
+ private val LOGGER = LoggerFactory.getLogger(ParamValidators.getClass)
--- End diff --
Let's switch this to use the Logging trait, to match other MLlib patterns.
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