Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19988#discussion_r157204320
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/optim/NormalEquationSolver.scala ---
@@ -17,10 +17,10 @@
package org.apache.spark.ml.optim
import scala.collection.mutable
-
import breeze.linalg.{DenseVector => BDV}
import breeze.optimize.{CachedDiffFunction, DiffFunction, LBFGS =>
BreezeLBFGS, OWLQN => BreezeOWLQN}
-
+import org.apache.spark.SparkException
--- End diff --
This will fail style checks. Restore the empty lines between groups.
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