Update app.py

app.py

@@ -7,7 +7,6 @@ from langchain.schema import Document
 from langgraph.graph import START, END, StateGraph
 from langchain.prompts import PromptTemplate
 import uuid
-from langchain_exa import ExaSearchRetriever, TextContentsOptions
 from langchain_groq import ChatGroq
 from langchain_community.utilities import GoogleSerperAPIWrapper
 from langchain_chroma import Chroma