Github user yanboliang commented on a diff in the pull request: https://github.com/apache/spark/pull/16059#discussion_r90776114 --- Diff: mllib/src/main/scala/org/apache/spark/ml/classification/OneVsRest.scala --- @@ -175,6 +183,8 @@ final class OneVsRestModel private[ml] ( val updateUDF = udf { (predictions: Map[Int, Double], prediction: Vector) => predictions + ((index, prediction(1))) } + model.setFeaturesCol($(featuresCol)) + model.setPredictionCol($(predictionCol)) --- End diff -- It's not necessary to ```setPredictionCol``` here, since the prediction column of each base binary classifier is ignored during the transformation. The ```predictionCol``` of ```OneVsRestModel``` was set at L198.
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