Update app.py

app.py

@@ -10,6 +10,7 @@ from langchain.memory import ConversationBufferMemory
 from langchain.document_loaders import PyPDFLoader
 from langchain.document_loaders import TextLoader
 from langchain.document_loaders import Docx2txtLoader
+from transformers import AutoTokenizer, AutoModelForCausalLM
 from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler
 import os
 from dotenv import load_dotenv