[Enhacne] Support maybe_raise_or_warn for peft (#5653)

* Support maybe_raise_or_warn for peft

* fix by comment

* unwrap function

Author: okotaku

src/diffusers/pipelines/pipeline_utils.py

@@ -49,6 +49,7 @@
     get_class_from_dynamic_module,
     is_accelerate_available,
     is_accelerate_version,
+    is_peft_available,
     is_torch_version,
     is_transformers_available,
     logging,
@@ -270,6 +271,20 @@ def warn_deprecated_model_variant(pretrained_model_name_or_path, use_auth_token,
         )
 
 
+def _unwrap_model(model):
+    """Unwraps a model."""
+    if is_compiled_module(model):
+        model = model._orig_mod
+
+    if is_peft_available():
+        from peft import PeftModel
+
+        if isinstance(model, PeftModel):
+            model = model.base_model.model
+
+    return model
+
+
 def maybe_raise_or_warn(
     library_name, library, class_name, importable_classes, passed_class_obj, name, is_pipeline_module
 ):
@@ -287,9 +302,8 @@ def maybe_raise_or_warn(
         # Dynamo wraps the original model in a private class.
         # I didn't find a public API to get the original class.
         sub_model = passed_class_obj[name]
-        model_cls = sub_model.__class__
-        if is_compiled_module(sub_model):
-            model_cls = sub_model._orig_mod.__class__
+        unwrapped_sub_model = _unwrap_model(sub_model)
+        model_cls = unwrapped_sub_model.__class__
 
         if not issubclass(model_cls, expected_class_obj):
             raise ValueError(