zhengruifeng created SPARK-28514:
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Summary: Remove the redundant transformImpl method in RF & GBT
Key: SPARK-28514
URL: https://issues.apache.org/jira/browse/SPARK-28514
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 3.0.0
Reporter: zhengruifeng
1, In GBTClassifier & RandomForestClassifier, the real transform methods
inherit from ProbabilisticClassificationModel which can deal with multi output
columns.
The transformImpl method, which deals with only one column - predictionCol,
completely does nothing. This is quite confusing.
2, In GBTRegressor & RandomForestRegressor, the transformImpl do exactly what
the superclass PredictionModel does (except model broadcasting), so can be
removed.
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