PEFT How to use marianna13/alpaca-lora-sum with PEFT:
from peft import PeftModel
from transformers import AutoModelForCausalLM
base_model = AutoModelForCausalLM.from_pretrained("decapoda-research/llama-7b-hf")
model = PeftModel.from_pretrained(base_model, "marianna13/alpaca-lora-sum") 
