class BaseOutput(OrderedDict):
    """
    Base class for all model outputs as dataclass. Has a `__getitem__` that allows indexing by integer or slice (like a
    tuple) or strings (like a dictionary) that will ignore the `None` attributes. Otherwise behaves like a regular
    Python dictionary.

    <Tip warning={true}>

    You can't unpack a [`BaseOutput`] directly. Use the [`~utils.BaseOutput.to_tuple`] method to convert it to a tuple
    first.

    </Tip>
    """

    def __init_subclass__(cls) -> None:
        """Register subclasses as pytree nodes.

        This is necessary to synchronize gradients when using `torch.nn.parallel.DistributedDataParallel` with
        `static_graph=True` with modules that output `ModelOutput` subclasses.
        """
        if is_torch_available():
            import torch.utils._pytree

            if is_torch_version("<", "2.2"):
                torch.utils._pytree._register_pytree_node(
                    cls,
                    torch.utils._pytree._dict_flatten,
                    lambda values, context: cls(**torch.utils._pytree._dict_unflatten(values, context)),
                )
            else:
                torch.utils._pytree.register_pytree_node(
                    cls,
                    torch.utils._pytree._dict_flatten,
                    lambda values, context: cls(**torch.utils._pytree._dict_unflatten(values, context)),
                )

    def __post_init__(self) -> None:
        class_fields = fields(self)

        # Safety and consistency checks
        if not len(class_fields):
            raise ValueError(f"{self.__class__.__name__} has no fields.")

        first_field = getattr(self, class_fields[0].name)
        other_fields_are_none = all(getattr(self, field.name) is None for field in class_fields[1:])

        if other_fields_are_none and isinstance(first_field, dict):
            for key, value in first_field.items():
                self[key] = value
        else:
            for field in class_fields:
                v = getattr(self, field.name)
                if v is not None:
                    self[field.name] = v

    def __delitem__(self, *args, **kwargs):
        raise Exception(f"You cannot use ``__delitem__`` on a {self.__class__.__name__} instance.")

    def setdefault(self, *args, **kwargs):
        raise Exception(f"You cannot use ``setdefault`` on a {self.__class__.__name__} instance.")

    def pop(self, *args, **kwargs):
        raise Exception(f"You cannot use ``pop`` on a {self.__class__.__name__} instance.")

    def update(self, *args, **kwargs):
        raise Exception(f"You cannot use ``update`` on a {self.__class__.__name__} instance.")

    def __getitem__(self, k: Any) -> Any:
        if isinstance(k, str):
            inner_dict = dict(self.items())
            return inner_dict[k]
        else:
            return self.to_tuple()[k]

    def __setattr__(self, name: Any, value: Any) -> None:
        if name in self.keys() and value is not None:
            # Don't call self.__setitem__ to avoid recursion errors
            super().__setitem__(name, value)
        super().__setattr__(name, value)

    def __setitem__(self, key, value):
        # Will raise a KeyException if needed
        super().__setitem__(key, value)
        # Don't call self.__setattr__ to avoid recursion errors
        super().__setattr__(key, value)

    def __reduce__(self):
        if not is_dataclass(self):
            return super().__reduce__()
        callable, _args, *remaining = super().__reduce__()
        args = tuple(getattr(self, field.name) for field in fields(self))
        return callable, args, *remaining

    def to_tuple(self) -> Tuple[Any, ...]:
        """
        Convert self to a tuple containing all the attributes/keys that are not `None`.
        """
        return tuple(self[k] for k in self.keys())
/Users/nielsrogge/Documents/python_projecten/diffusers/src/diffusers/utils/outputs.py