alpaca_lora_4bit

Made some adjust for the code in peft and gptq for llama, and make it possible for lora finetuning with a 4 bits base model. The same adjustment can be made for 2, 3 and 8 bits.

packages required

gptq-for-llama: https://github.com/qwopqwop200/GPTQ-for-LLaMa