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np.float64 is not an alias to a Python type. It is an actual NumPy dtype. More over, the documentation should match the actual default value:

np.float64 is not an alias to a Python type. It is an actual NumPy dtype. More over, the documentation should match the actual default value:

scikit-learn/sklearn/preprocessing/_encoders.py

Line 1438 in acf60de

dtype=np.float64,

OK, but in this case, the default dtype of OneHotEncoder should also be set to np.float64 right?

Yes, I think OneHotEncoder's docs should have default=np.float64 to better represent what the code is doing.

Yes, I think OneHotEncoder's docs should have default=np.float64 to better represent what the code is doing.

Fixes in #27054