1from typing import AnyStr 2 3from torch import Tensor 4 5class UndefinedGrad: 6 def __init__(self) -> None: ... 7 def __call__(self, *inputs: Tensor) -> list[Tensor]: ... 8 9class DelayedError: 10 def __init__(self, msg: AnyStr, num_inputs: int) -> None: ... 11 def __call__(self, inputs: list[Tensor]) -> list[Tensor]: ... 12