Github user smurching commented on a diff in the pull request:
https://github.com/apache/spark/pull/19278#discussion_r139817121
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala ---
@@ -17,6 +17,7 @@
package org.apache.spark.ml.tuning
+import java.io.IOException
--- End diff --
This exception is unused & can be removed.
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