Update app.py

app.py

@@ -1,15 +1,13 @@
-import os
-from typing import List
-
 import chainlit as cl
 import arxiv
-from langchain_openai import ChatOpenAI, OpenAIEmbeddings
+from langchain.chat_models import ChatOpenAI
 from langchain.chains import ConversationalRetrievalChain
 from langchain.memory import ConversationBufferMemory
 from langchain.text_splitter import CharacterTextSplitter
+from langchain.embeddings import OpenAIEmbeddings
 from langchain.vectorstores import FAISS
+import os
 from dotenv import load_dotenv
-
 load_dotenv()
 
 class ArxivResearchAssistant: