Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/19993#discussion_r163561075
--- Diff: mllib/src/test/scala/org/apache/spark/ml/param/ParamsSuite.scala
---
@@ -20,8 +20,11 @@ package org.apache.spark.ml.param
import java.io.{ByteArrayOutputStream, ObjectOutputStream}
import org.apache.spark.SparkFunSuite
+import org.apache.spark.ml.{Estimator, Transformer}
import org.apache.spark.ml.linalg.{Vector, Vectors}
+import org.apache.spark.ml.param.shared.{HasInputCol, HasInputCols,
HasOutputCol, HasOutputCols}
--- End diff --
I don't think these are used any longer?
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