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from transformers import AutoModelForCausalLM, AutoTokenizer | |
from peft import PeftModel | |
import torch | |
import os | |
import argparse | |
def get_args(): | |
parser = argparse.ArgumentParser() | |
parser.add_argument("--base_model_name_or_path", type=str) | |
parser.add_argument("--peft_model_path", type=str) | |
parser.add_argument("--output_dir", type=str) | |
parser.add_argument("--device", type=str, default="auto") | |
parser.add_argument("--push_to_hub", action="store_true") | |
return parser.parse_args() | |
def main(): | |
args = get_args() | |
if args.device == "auto": | |
device_arg = {"device_map": "auto"} | |
else: | |
device_arg = {"device_map": {"": args.device}} | |
print(f"Loading base model: {args.base_model_name_or_path}") | |
base_model = AutoModelForCausalLM.from_pretrained( | |
args.base_model_name_or_path, | |
return_dict=True, | |
torch_dtype=torch.float16, | |
load_in_4bit=True, | |
**device_arg, | |
) | |
print(f"Loading PEFT: {args.peft_model_path}") | |
model = PeftModel.from_pretrained(base_model, args.peft_model_path, **device_arg) | |
print(f"Running merge_and_unload") | |
model = model.merge_and_unload() # throws ValueError("Cannot merge LORA layers when the model is loaded in 8-bit mode") | |
model = model.to(torch.float16) | |
tokenizer = AutoTokenizer.from_pretrained(args.base_model_name_or_path) | |
if args.push_to_hub: | |
print(f"Saving to hub ...") | |
model.push_to_hub(f"{args.output_dir}", use_temp_dir=False) | |
tokenizer.push_to_hub(f"{args.output_dir}", use_temp_dir=False) | |
else: | |
model.save_pretrained(f"{args.output_dir}") | |
tokenizer.save_pretrained(f"{args.output_dir}") | |
print(f"Model saved to {args.output_dir}") | |
if __name__ == "__main__": | |
main() |
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