Update app.py

app.py

@@ -4,11 +4,12 @@ from langchain_google_genai import GoogleGenerativeAIEmbeddings
 import google.generativeai as genai
 from langchain_community.vectorstores import FAISS
 from langchain_google_genai import ChatGoogleGenerativeAI
+from typings import Optional
 
 genai.configure(api_key="AIzaSyD2o8vjePJb6z8vT_PVe82lVWMD3_cBL0g")
 
 
-def predict(message :str ,history,topic : str = "OIC") -> str:
+def predict(message :str ,history : Optional[List],topic : Optional[str] = "OIC") -> str:
     model = genai.GenerativeModel("gemini-pro")
     his = []
     for i,j in history: