causal-forest
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TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'
--> 447 left = sorted_subset_index[: (split_index + 1)]
448 right = sorted_subset_index[(split_index + 1) :]
449 nonzero_index = np.nonzero(index)[0]
TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'