zhengruifeng commented on issue #25256: [SPARK-28514][ML] Remove the redundant transformImpl method in RF & GBT URL: https://github.com/apache/spark/pull/25256#issuecomment-517611401 @srowen The `transform` method (which need override `transformImpl`) defined in `PredictionModel` is overrided by the the one (which need override `predict`/`predictRaw`/...) define in `ProbabilisticClassificationModel`. <img width="408" alt="图片" src="https://user-images.githubusercontent.com/7322292/62356011-b58e9480-b542-11e9-973a-5bc9dfe23f03.png";>
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