fix

app.py

@@ -11,6 +11,7 @@ from langchain_core.documents import Document
 from langchain_core.prompts import ChatPromptTemplate
 from langchain.text_splitter import CharacterTextSplitter
 from huggingface_hub import InferenceClient
+from tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception_type
 import logging
 import os