增加了qlora的finetune

finetune/finetune.py

@@ -7,7 +7,7 @@ import torch
 import transformers
 from torch.utils.data import Dataset
 from transformers import (AutoModelForCausalLM, AutoTokenizer, Trainer,
-                          TrainingArguments)
+                          TrainingArguments,BitsAndBytesConfig)
 
 
 @dataclass
@@ -38,6 +38,7 @@ class TrainingArguments(transformers.TrainingArguments):
         },
     )
     use_lora: bool = field(default=False)
+    qlora: bool = field(default=False)
 
 
 class SupervisedDataset(Dataset):
@@ -121,6 +122,7 @@ def load_model_and_tokenizer(
     model_path: str,
     max_length: int = 4096,
     use_lora: bool = True,
+    qlora: bool = False,
     bf16: bool = False,
     fp16: bool = False,
 ):
@@ -135,6 +137,28 @@ def load_model_and_tokenizer(
         dtype = torch.float16
     else:
         dtype = torch.float32
+    if qlora:
+        assert use_lora, "use_lora must be True when use_qlora is True"
+        quantization_config = BitsAndBytesConfig(
+            load_in_4bit=True,  # 是否进行4bit量化
+            load_in_8bit=False,  # 是否进行8bit量化
+            bnb_4bit_compute_dtype=torch.float16,  # 计算精度设置
+            bnb_4bit_quant_storage=torch.uint8,  # 量化权重的储存格式
+            bnb_4bit_quant_type="nf4",  # 量化格式，这里用的是正太分布的int4
+            bnb_4bit_use_double_quant=True,  # 是否采用双量化，即对zeropoint和scaling参数进行量化
+            llm_int8_enable_fp32_cpu_offload=False,  # 是否llm使用int8，cpu上保存的参数使用fp32
+            llm_int8_has_fp16_weight=False,  # 是否启用混合精度
+            #llm_int8_skip_modules=["out_proj", "kv_proj", "lm_head"],  # 不进行量化的模块
+            llm_int8_threshold=6.0,  # llm.int8()算法中的离群值，根据这个值区分是否进行量化
+        )
+        model = AutoModelForCausalLM.from_pretrained(
+            model_path,
+            torch_dtype=dtype,
+            trust_remote_code=True,
+            quantization_config=quantization_config,
+
+        )
+    else:
         model = AutoModelForCausalLM.from_pretrained(
             model_path,
             torch_dtype=dtype,
@@ -170,6 +194,7 @@ if __name__ == "__main__":
         model_path=model_args.model_name_or_path,
         max_length=training_args.model_max_length,
         use_lora=training_args.use_lora,
+        qlora=training_args.qlora,
         bf16=training_args.bf16,
         fp16=training_args.fp16
     )