Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7771#discussion_r35929697
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala ---
@@ -300,7 +303,8 @@ class LinearRegressionTrainingSummary
private[regression] (
predictions: DataFrame,
--- End diff --
Do not do production when creating this summary. Then we only need to
remember the feature column name.
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