[LoRA] Improve copied from comments in the LoRA loader classes (#10995)

* more sanity of mind with copied from ...

* better

* better

src/diffusers/loaders/lora_pipeline.py

@@ -843,11 +843,11 @@ class StableDiffusionXLLoraLoaderMixin(LoraBaseMixin):
 
         if not (unet_lora_layers or text_encoder_lora_layers or text_encoder_2_lora_layers):
             raise ValueError(
-                "You must pass at least one of `unet_lora_layers`, `text_encoder_lora_layers` or `text_encoder_2_lora_layers`."
+                "You must pass at least one of `unet_lora_layers`, `text_encoder_lora_layers`, `text_encoder_2_lora_layers`."
             )
 
         if unet_lora_layers:
-            state_dict.update(cls.pack_weights(unet_lora_layers, "unet"))
+            state_dict.update(cls.pack_weights(unet_lora_layers, cls.unet_name))
 
         if text_encoder_lora_layers:
             state_dict.update(cls.pack_weights(text_encoder_lora_layers, "text_encoder"))
@@ -1210,10 +1210,11 @@ class SD3LoraLoaderMixin(LoraBaseMixin):
         )
 
     @classmethod
+    # Copied from diffusers.loaders.lora_pipeline.StableDiffusionXLLoraLoaderMixin.save_lora_weights with unet->transformer
     def save_lora_weights(
         cls,
         save_directory: Union[str, os.PathLike],
-        transformer_lora_layers: Dict[str, torch.nn.Module] = None,
+        transformer_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
         text_encoder_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
         text_encoder_2_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
         is_main_process: bool = True,
@@ -1262,7 +1263,6 @@ class SD3LoraLoaderMixin(LoraBaseMixin):
         if text_encoder_2_lora_layers:
             state_dict.update(cls.pack_weights(text_encoder_2_lora_layers, "text_encoder_2"))
 
-        # Save the model
         cls.write_lora_layers(
             state_dict=state_dict,
             save_directory=save_directory,
@@ -1272,6 +1272,7 @@ class SD3LoraLoaderMixin(LoraBaseMixin):
             safe_serialization=safe_serialization,
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.StableDiffusionXLLoraLoaderMixin.fuse_lora with unet->transformer
     def fuse_lora(
         self,
         components: List[str] = ["transformer", "text_encoder", "text_encoder_2"],
@@ -1315,6 +1316,7 @@ class SD3LoraLoaderMixin(LoraBaseMixin):
             components=components, lora_scale=lora_scale, safe_fusing=safe_fusing, adapter_names=adapter_names
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.StableDiffusionXLLoraLoaderMixin.unfuse_lora with unet->transformer
     def unfuse_lora(self, components: List[str] = ["transformer", "text_encoder", "text_encoder_2"], **kwargs):
         r"""
         Reverses the effect of
@@ -1328,7 +1330,7 @@ class SD3LoraLoaderMixin(LoraBaseMixin):
 
         Args:
             components (`List[str]`): List of LoRA-injectable components to unfuse LoRA from.
-            unfuse_unet (`bool`, defaults to `True`): Whether to unfuse the UNet LoRA parameters.
+            unfuse_transformer (`bool`, defaults to `True`): Whether to unfuse the UNet LoRA parameters.
             unfuse_text_encoder (`bool`, defaults to `True`):
                 Whether to unfuse the text encoder LoRA parameters. If the text encoder wasn't monkey-patched with the
                 LoRA parameters then it won't have any effect.
@@ -2833,6 +2835,7 @@ class Mochi1LoraLoaderMixin(LoraBaseMixin):
             safe_serialization=safe_serialization,
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.fuse_lora
     def fuse_lora(
         self,
         components: List[str] = ["transformer"],
@@ -2876,6 +2879,7 @@ class Mochi1LoraLoaderMixin(LoraBaseMixin):
             components=components, lora_scale=lora_scale, safe_fusing=safe_fusing, adapter_names=adapter_names
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.unfuse_lora
     def unfuse_lora(self, components: List[str] = ["transformer"], **kwargs):
         r"""
         Reverses the effect of
@@ -3136,6 +3140,7 @@ class LTXVideoLoraLoaderMixin(LoraBaseMixin):
             safe_serialization=safe_serialization,
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.fuse_lora
     def fuse_lora(
         self,
         components: List[str] = ["transformer"],
@@ -3179,6 +3184,7 @@ class LTXVideoLoraLoaderMixin(LoraBaseMixin):
             components=components, lora_scale=lora_scale, safe_fusing=safe_fusing, adapter_names=adapter_names
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.unfuse_lora
     def unfuse_lora(self, components: List[str] = ["transformer"], **kwargs):
         r"""
         Reverses the effect of
@@ -3439,6 +3445,7 @@ class SanaLoraLoaderMixin(LoraBaseMixin):
             safe_serialization=safe_serialization,
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.fuse_lora
     def fuse_lora(
         self,
         components: List[str] = ["transformer"],
@@ -3482,6 +3489,7 @@ class SanaLoraLoaderMixin(LoraBaseMixin):
             components=components, lora_scale=lora_scale, safe_fusing=safe_fusing, adapter_names=adapter_names
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.unfuse_lora
     def unfuse_lora(self, components: List[str] = ["transformer"], **kwargs):
         r"""
         Reverses the effect of
@@ -3745,6 +3753,7 @@ class HunyuanVideoLoraLoaderMixin(LoraBaseMixin):
             safe_serialization=safe_serialization,
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.fuse_lora
     def fuse_lora(
         self,
         components: List[str] = ["transformer"],
@@ -3788,6 +3797,7 @@ class HunyuanVideoLoraLoaderMixin(LoraBaseMixin):
             components=components, lora_scale=lora_scale, safe_fusing=safe_fusing, adapter_names=adapter_names
         )
 
+    # Copied from diffusers.loaders.lora_pipeline.CogVideoXLoraLoaderMixin.unfuse_lora
     def unfuse_lora(self, components: List[str] = ["transformer"], **kwargs):
         r"""
         Reverses the effect of