Update app.py

app.py

@@ -5,7 +5,7 @@ from langchain.text_splitter import CharacterTextSplitter
 from langchain.embeddings import SentenceTransformerEmbeddings
 from langchain.vectorstores import FAISS
 from langchain.chains import RetrievalQA
-from transformers import AutoTokenizer, AutoModelForCausalLM, pipeline
+from transformers import AutoTokenizer, AutoModelForSeq2SeqLM, pipeline
 import os
 import torch
 # Load FLAN-T5 model