src/transformers/models/auto/auto_factory.py/_LazyAutoMapping/__init__
class _LazyAutoMapping:    def __init__(self, config_mapping, model_mapping):
        self._config_mapping = config_mapping
        self._reverse_config_mapping = {v: k for k, v in config_mapping.items()}
        self._model_mapping = model_mapping
        self._extra_content = {}
        self._modules = {}