Github user smurching commented on a diff in the pull request:
https://github.com/apache/spark/pull/19381#discussion_r151020666
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/regression/GBTRegressorSuite.scala ---
@@ -19,15 +19,16 @@ package org.apache.spark.ml.regression
import org.apache.spark.SparkFunSuite
import org.apache.spark.ml.feature.LabeledPoint
-import org.apache.spark.ml.linalg.Vectors
+import org.apache.spark.ml.linalg.{Vector, Vectors}
import org.apache.spark.ml.tree.impl.TreeTests
import org.apache.spark.ml.util.{DefaultReadWriteTest, MLTestingUtils}
+import org.apache.spark.ml.util.TestingUtils._
--- End diff --
Nit: unused import
---
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