Allow the same config in the auto mapping (#16631)

src/transformers/models/auto/configuration_auto.py

@@ -389,8 +389,14 @@ class _LazyConfigMapping(OrderedDict):
         module_name = model_type_to_module_name(key)
         if module_name not in self._modules:
             self._modules[module_name] = importlib.import_module(f".{module_name}", "transformers.models")
+        if hasattr(self._modules[module_name], value):
             return getattr(self._modules[module_name], value)
 
+        # Some of the mappings have entries model_type -> config of another model type. In that case we try to grab the
+        # object at the top level.
+        transformers_module = importlib.import_module("transformers")
+        return getattr(transformers_module, value)
+
     def keys(self):
         return list(self._mapping.keys()) + list(self._extra_content.keys())