Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/11621#discussion_r58467127
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala ---
@@ -539,6 +539,10 @@ class LinearRegressionTrainingSummary
private[regression] (
* Linear regression results evaluated on a dataset.
*
* @param predictions predictions outputted by the model's `transform`
method.
+ * @param predictionCol Field in "predictions" which gives the predicted
value of the label at
+ * each instance.
+ * @param labelCol Field in "predictions" which gives the true label of
each instance
+ * (if available).
--- End diff --
Hmm, good point; "if available" only makes sense for the generic summary
classes, not the *TrainingSummary classes.
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