Set self._hf_peft_config_loaded to True when LoRA is loaded using load_lora_adapter in PeftAdapterMixin class (huggingface#11155)

set self._hf_peft_config_loaded to True on successful lora load

Sets the `_hf_peft_config_loaded` flag if a LoRA is successfully loaded in `load_lora_adapter`. Fixes bug huggingface/issues/11148

Co-authored-by: Sayak Paul <[email protected]>

Author: kentdan3msu

src/diffusers/loaders/peft.py

@@ -307,6 +307,9 @@ def load_lora_adapter(self, pretrained_model_name_or_path_or_dict, prefix="trans
             try:
                 inject_adapter_in_model(lora_config, self, adapter_name=adapter_name, **peft_kwargs)
                 incompatible_keys = set_peft_model_state_dict(self, state_dict, adapter_name, **peft_kwargs)
+                # Set peft config loaded flag to True if module has been successfully injected and incompatible keys retrieved
+                if not self._hf_peft_config_loaded:
+                    self._hf_peft_config_loaded = True
             except Exception as e:
                 # In case `inject_adapter_in_model()` was unsuccessful even before injecting the `peft_config`.
                 if hasattr(self, "peft_config"):