keep _use_default_values as a list type (#4040)

Signed-off-by: Raphael <oOraph@users.noreply.github.com>
Co-authored-by: Raphael <oOraph@users.noreply.github.com>

src/diffusers/configuration_utils.py

@@ -607,7 +607,7 @@ def register_to_config(init):
 
         # Take note of the parameters that were not present in the loaded config
         if len(set(new_kwargs.keys()) - set(init_kwargs)) > 0:
-            new_kwargs["_use_default_values"] = set(new_kwargs.keys()) - set(init_kwargs)
+            new_kwargs["_use_default_values"] = list(set(new_kwargs.keys()) - set(init_kwargs))
 
         new_kwargs = {**config_init_kwargs, **new_kwargs}
         getattr(self, "register_to_config")(**new_kwargs)
@@ -655,7 +655,7 @@ def flax_register_to_config(cls):
 
         # Take note of the parameters that were not present in the loaded config
         if len(set(new_kwargs.keys()) - set(init_kwargs)) > 0:
-            new_kwargs["_use_default_values"] = set(new_kwargs.keys()) - set(init_kwargs)
+            new_kwargs["_use_default_values"] = list(set(new_kwargs.keys()) - set(init_kwargs))
 
         getattr(self, "register_to_config")(**new_kwargs)
         original_init(self, *args, **kwargs)

tests/others/test_config.py

@@ -264,7 +264,7 @@ class ConfigTester(unittest.TestCase):
         config_dict = {k: v for k, v in config.config.items() if not k.startswith("_")}
 
         # make sure that default config has all keys in `_use_default_values`
-        assert set(config_dict.keys()) == config.config._use_default_values
+        assert set(config_dict.keys()) == set(config.config._use_default_values)
 
         with tempfile.TemporaryDirectory() as tmpdirname:
             config.save_config(tmpdirname)