Update app.py

app.py

@@ -1,15 +1,14 @@
-import os
 import time
-from langchain.embeddings.base import Embeddings
-from langchain_together import TogetherEmbeddings
 import streamlit as st
-from langchain.chat_models import ChatOpenAI
 from langchain.document_loaders import PyPDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain.schema import Document
-from langchain.chains import RetrievalQA
+from langchain.embeddings.base import Embeddings
 from langchain.vectorstores import FAISS
 from langchain.indexes import VectorstoreIndexCreator
+from langchain.chains import RetrievalQA
+from langchain.chat_models import ChatOpenAI
+from typing import List
+from together import Together
 
 # ----------------- تنظیمات صفحه -----------------
 st.set_page_config(page_title="چت‌ بات توانا", page_icon="🪖", layout="wide")