Fix a missing transform method override in the cleaner mapper. Since the drop action is done by the mapper, not the smart transformer, we have to do the same in the mapper's transform method too. This allows empty columns to be dropped during the test/predict/score phase. Otherwise it will not work properly.
Description
Fix a missing transform method override in the cleaner mapper. Since the drop action is done by the mapper, not the smart transformer, we have to do the same in the mapper's
transformmethod too. This allows empty columns to be dropped during the test/predict/score phase. Otherwise it will not work properly.