RFC Allow passthrough as pipeline step instead of None #11144
As I mentioned here it might make sense to deprecate setting pipeline steps to
This might also give us an opportunity to easily specify "blank" pipelines for which you want to search the steps. Right now it's not easy to say "I want a pipeline with three steps and then let the GridSearch figure out the steps" because you need to provide actual steps at instantiation.
pipe = Pipeline([("imputer", "passthrough"), ("scaler", "passthrough"), ("classifier", "passthrough")])
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