erform pre-processing before the ``state_dict`` call is made. Args: hook (Callable): The user defined hook to be registered. prepend (bool): If True, the provided pre ``hook`` will be fired before all the already registered pre-hooks on ``state_dict``. Otherwise, the provided ``hook`` will be fired after all the already registered pre-hooks. (default: False) Returns: :class:`torch.utils.hooks.RemoveableHandle`: a handle that can be used to remove the added hook by calling ``handle.remove()`` Fİ