Check correct model type is passed to `from_pretrained` (#10189)

* Check correct model type is passed to `from_pretrained`

* Flax, skip scheduler

* test_wrong_model

* Fix for scheduler

* Update tests/pipelines/test_pipelines.py
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

* EnumMeta

* Flax

* scheduler in expected types

* make

* type object 'CLIPTokenizer' has no attribute '_PipelineFastTests__name'

* support union

* fix typing in kandinsky

* make

* add LCMScheduler

* 'LCMScheduler' object has no attribute 'sigmas'

* tests for wrong scheduler

* make

* update

* warning

* tests

* Update src/diffusers/pipelines/pipeline_utils.py
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>

* import FlaxSchedulerMixin

* skip scheduler

---------
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>

src/diffusers/pipelines/pipeline_utils.py

@@ -13,6 +13,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import enum
 import fnmatch
 import importlib
 import inspect
@@ -811,6 +812,7 @@ class DiffusionPipeline(ConfigMixin, PushToHubMixin):
         # in this case they are already instantiated in `kwargs`
         # extract them here
         expected_modules, optional_kwargs = cls._get_signature_keys(pipeline_class)
+        expected_types = pipeline_class._get_signature_types()
         passed_class_obj = {k: kwargs.pop(k) for k in expected_modules if k in kwargs}
         passed_pipe_kwargs = {k: kwargs.pop(k) for k in optional_kwargs if k in kwargs}
         init_dict, unused_kwargs, _ = pipeline_class.extract_init_dict(config_dict, **kwargs)
@@ -833,6 +835,26 @@ class DiffusionPipeline(ConfigMixin, PushToHubMixin):
 
         init_dict = {k: v for k, v in init_dict.items() if load_module(k, v)}
 
+        for key in init_dict.keys():
+            if key not in passed_class_obj:
+                continue
+            if "scheduler" in key:
+                continue
+
+            class_obj = passed_class_obj[key]
+            _expected_class_types = []
+            for expected_type in expected_types[key]:
+                if isinstance(expected_type, enum.EnumMeta):
+                    _expected_class_types.extend(expected_type.__members__.keys())
+                else:
+                    _expected_class_types.append(expected_type.__name__)
+
+            _is_valid_type = class_obj.__class__.__name__ in _expected_class_types
+            if not _is_valid_type:
+                logger.warning(
+                    f"Expected types for {key}: {_expected_class_types}, got {class_obj.__class__.__name__}."
+                )
+
         # Special case: safety_checker must be loaded separately when using `from_flax`
         if from_flax and "safety_checker" in init_dict and "safety_checker" not in passed_class_obj:
             raise NotImplementedError(

tests/pipelines/test_pipelines.py

@@ -1802,6 +1802,16 @@ class PipelineFastTests(unittest.TestCase):
         sd.maybe_free_model_hooks()
         assert sd._offload_gpu_id == 5
 
+    def test_wrong_model(self):
+        tokenizer = CLIPTokenizer.from_pretrained("hf-internal-testing/tiny-random-clip")
+        with self.assertRaises(ValueError) as error_context:
+            _ = StableDiffusionPipeline.from_pretrained(
+                "hf-internal-testing/diffusers-stable-diffusion-tiny-all", text_encoder=tokenizer
+            )
+
+        assert "is of type" in str(error_context.exception)
+        assert "but should be" in str(error_context.exception)
+
 
 @slow
 @require_torch_gpu