[LoRA] remove full key prefix from peft. (#11004)

remove full key prefix from peft.

src/diffusers/loaders/peft.py

@@ -192,11 +192,6 @@ class PeftAdapterMixin:
         from peft import LoraConfig, inject_adapter_in_model, set_peft_model_state_dict
         from peft.tuners.tuners_utils import BaseTunerLayer
 
-        try:
-            from peft.utils.constants import FULLY_QUALIFIED_PATTERN_KEY_PREFIX
-        except ImportError:
-            FULLY_QUALIFIED_PATTERN_KEY_PREFIX = None
-
         cache_dir = kwargs.pop("cache_dir", None)
         force_download = kwargs.pop("force_download", False)
         proxies = kwargs.pop("proxies", None)
@@ -261,22 +256,16 @@ class PeftAdapterMixin:
                 # Cannot figure out rank from lora layers that don't have atleast 2 dimensions.
                 # Bias layers in LoRA only have a single dimension
                 if "lora_B" in key and val.ndim > 1:
-                    # Support to handle cases where layer patterns are treated as full layer names
-                    # was added later in PEFT. So, we handle it accordingly.
-                    # TODO: when we fix the minimal PEFT version for Diffusers,
-                    # we should remove `_maybe_adjust_config()`.
-                    if FULLY_QUALIFIED_PATTERN_KEY_PREFIX:
-                        rank[f"{FULLY_QUALIFIED_PATTERN_KEY_PREFIX}{key}"] = val.shape[1]
-                    else:
-                        rank[key] = val.shape[1]
+                    # TODO: revisit this after https://github.com/huggingface/peft/pull/2382 is merged.
+                    rank[key] = val.shape[1]
 
             if network_alphas is not None and len(network_alphas) >= 1:
                 alpha_keys = [k for k in network_alphas.keys() if k.startswith(f"{prefix}.")]
                 network_alphas = {k.replace(f"{prefix}.", ""): v for k, v in network_alphas.items() if k in alpha_keys}
 
             lora_config_kwargs = get_peft_kwargs(rank, network_alpha_dict=network_alphas, peft_state_dict=state_dict)
-            if not FULLY_QUALIFIED_PATTERN_KEY_PREFIX:
-                lora_config_kwargs = _maybe_adjust_config(lora_config_kwargs)
+            # TODO: revisit this after https://github.com/huggingface/peft/pull/2382 is merged.
+            lora_config_kwargs = _maybe_adjust_config(lora_config_kwargs)
 
             if "use_dora" in lora_config_kwargs:
                 if lora_config_kwargs["use_dora"]: