al_norm` using the new
        parametrization functionality in
        :func:`torch.nn.utils.parametrize.register_parametrization`. Please use
        the newer version. This function will be deprecated in a future version
        of PyTorch.

    Example::

        >>> m = spectral_norm(nn.Linear(20, 40))
        >>> m
        Linear(in_features=20, out_features=40, bias=True)
        >>> m.weight_u.size()
        torch.Size([40])

    Nr