[LoRA] change to warning from info when notifying the users about a LoRA no-op (huggingface#11044)

* move to warning.

* test related changes.

Author: sayakpaul

src/diffusers/loaders/lora_base.py

@@ -423,8 +423,12 @@ def _load_lora_into_text_encoder(
         # Unsafe code />
 
     if prefix is not None and not state_dict:
-        logger.info(
-            f"No LoRA keys associated to {text_encoder.__class__.__name__} found with the {prefix=}. This is safe to ignore if LoRA state dict didn't originally have any {text_encoder.__class__.__name__} related params. Open an issue if you think it's unexpected: https://github.com/huggingface/diffusers/issues/new"
+        logger.warning(
+            f"No LoRA keys associated to {text_encoder.__class__.__name__} found with the {prefix=}. "
+            "This is safe to ignore if LoRA state dict didn't originally have any "
+            f"{text_encoder.__class__.__name__} related params. You can also try specifying `prefix=None` "
+            "to resolve the warning. Otherwise, open an issue if you think it's unexpected: "
+            "https://github.com/huggingface/diffusers/issues/new"
         )
 
 

src/diffusers/loaders/peft.py

@@ -354,8 +354,12 @@ def load_lora_adapter(self, pretrained_model_name_or_path_or_dict, prefix="trans
             # Unsafe code />
 
         if prefix is not None and not state_dict:
-            logger.info(
-                f"No LoRA keys associated to {self.__class__.__name__} found with the {prefix=}. This is safe to ignore if LoRA state dict didn't originally have any {self.__class__.__name__} related params. Open an issue if you think it's unexpected: https://github.com/huggingface/diffusers/issues/new"
+            logger.warning(
+                f"No LoRA keys associated to {self.__class__.__name__} found with the {prefix=}. "
+                "This is safe to ignore if LoRA state dict didn't originally have any "
+                f"{self.__class__.__name__} related params. You can also try specifying `prefix=None` "
+                "to resolve the warning. Otherwise, open an issue if you think it's unexpected: "
+                "https://github.com/huggingface/diffusers/issues/new"
             )
 
     def save_lora_adapter(

tests/lora/utils.py

@@ -1961,7 +1961,7 @@ def test_logs_info_when_no_lora_keys_found(self):
 
         no_op_state_dict = {"lora_foo": torch.tensor(2.0), "lora_bar": torch.tensor(3.0)}
         logger = logging.get_logger("diffusers.loaders.peft")
-        logger.setLevel(logging.INFO)
+        logger.setLevel(logging.WARNING)
 
         with CaptureLogger(logger) as cap_logger:
             pipe.load_lora_weights(no_op_state_dict)
@@ -1981,7 +1981,7 @@ def test_logs_info_when_no_lora_keys_found(self):
                     prefix = "text_encoder_2"
 
                 logger = logging.get_logger("diffusers.loaders.lora_base")
-                logger.setLevel(logging.INFO)
+                logger.setLevel(logging.WARNING)
 
                 with CaptureLogger(logger) as cap_logger:
                     self.pipeline_class.load_lora_into_text_encoder(