PEFT How to use zbigi/bart-base-summarization-cnn-45 with PEFT:
from peft import PeftModel
from transformers import AutoModelForSeq2SeqLM
base_model = AutoModelForSeq2SeqLM.from_pretrained("facebook/bart-base")
model = PeftModel.from_pretrained(base_model, "zbigi/bart-base-summarization-cnn-45") 
