PEFT How to use Shikhar167/medium_gpt2_medium with PEFT:
from peft import PeftModel
from transformers import AutoModelForCausalLM
base_model = AutoModelForCausalLM.from_pretrained("gpt2-medium")
model = PeftModel.from_pretrained(base_model, "Shikhar167/medium_gpt2_medium") 
