add scaling (#8256)

* add scaling

* add scaling

* add scaling

* format

Author: lugimzzz

paddlenlp/peft/lora/lora_config.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import json
+import math
 import os
 from dataclasses import asdict, dataclass, field
 from typing import List, Optional, Union
@@ -94,6 +95,15 @@ def __post_init__(self):
             )
             self.use_quick_lora = False
 
+    @property
+    def scaling(self):
+        if not self.rslora and not self.pissa:
+            return self.lora_alpha / self.r
+        elif self.pissa:
+            return 1.0
+        else:
+            return self.lora_alpha / math.sqrt(self.r)
+
     @property
     def __dict__(self):
         return asdict(self)
@@ -114,6 +124,7 @@ def save_pretrained(self, save_directory):
         os.makedirs(save_directory, exist_ok=True)
 
         output_dict = self.__dict__
+        output_dict["scaling"] = self.scaling
         output_path = os.path.join(save_directory, LORA_CONFIG_NAME)
 
         # save it
@@ -136,6 +147,7 @@ def from_pretrained(cls, pretrained_model_name_or_path, **kwargs):
             raise ValueError(f"Can't find lora_config.json at '{pretrained_model_name_or_path}'")
 
         loaded_attributes = cls.from_json_file(config_file)
+        loaded_attributes.pop("scaling", None)
 
         config = cls(**kwargs)