srowen commented on a change in pull request #27059: [SPARK-30398][ML]
PCA/RegressionMetrics/RowMatrix avoid unnecessary computation
URL: https://github.com/apache/spark/pull/27059#discussion_r362494255
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File path: mllib/src/main/scala/org/apache/spark/mllib/stat/Statistics.scala
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@@ -21,6 +21,7 @@ import scala.annotation.varargs
import org.apache.spark.annotation.Since
import org.apache.spark.api.java.{JavaDoubleRDD, JavaRDD}
+import org.apache.spark.ml.stat._
Review comment:
I guess it's not reasonable to move the implementation to /mllib ? No big
deal, just wondering if we can generally have ml call mllib and not the
reverse, but this isn't 100% true even now.
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