DatasetTransformer throws when is used on its own

[ganik]

Repro: r0 = Pipeline([MinMaxScaler()]) r0.fit(train_df)

r1 = Pipeline([DatasetTransformer(r0.model)]) r1.fit_transform(train_df) <---- throws here

Traceback (most recent call last): r1.fit_transform(train_df) File "E:\sources\tmp\NimbusML\src\python\nimbusml\internal\utils\utils.py", line 220, in wrapper params = func(*args, **kwargs) File "E:\sources\tmp\NimbusML\src\python\nimbusml\pipeline.py", line 1132, in fit_transform **params) File "E:\sources\tmp\NimbusML\src\python\nimbusml\internal\utils\utils.py", line 220, in wrapper params = func(*args, **kwargs) File "E:\sources\tmp\NimbusML\src\python\nimbusml\pipeline.py", line 1051, in fit X, y, verbose, **params) File "E:\sources\tmp\NimbusML\src\python\nimbusml\pipeline.py", line 740, in _fit_graph *(graph_nodes)) File "E:\sources\tmp\NimbusML\src\python\nimbusml\internal\utils\entrypoints.py", line 206, in init self._set_outputs(outputs) File "E:\sources\tmp\NimbusML\src\python\nimbusml\internal\utils\entrypoints.py", line 253, in _set_outputs "outputs from the graph do not match graph_outputs.") ValueError: outputs from the graph do not match graph_outputs.