src/transformers/models/auto/auto_factory.py/_LazyAutoMapping/__contains__
class _LazyAutoMapping:    def __contains__(self, item):
        if item in self._extra_content:
            return True
        if not hasattr(item, "__name__") or item.__name__ not in self._reverse_config_mapping:
            return False
        model_type = self._reverse_config_mapping[item.__name__]
        return model_type in self._model_mapping