Method backward

python/oneflow/autograd/autograd_function.py:79–85

r""" Override this function for custom backward calculation.

(ctx, *out_grads)

    @staticmethod
    def backward(ctx, *out_grads):
        r"""
        Override this function for custom backward calculation.
        """
        raise NotImplementedError(
            "You must implement the backward function for custom autograd.Function."
        )