def backward(self, tensor: Tensor, module: Optional[Module], *args: Any, **kwargs: Any) -> None:
        r"""Forwards backward-calls to the precision plugin."""
        self.precision.pre_backward(tensor, module)
        self.precision.backward(tensor, module, *args, **kwargs)
        self.precision.post_backward(tensor, module)
Forwards backward-calls to the precision plugin.
src/lightning/fabric/strategies/strategy.py