Update nexus.py

nexus.py

@@ -1,11 +1,12 @@
-from llama_index import VectaraIndex
+from llama_index.indices.managed.vectara import VectaraIndex
 from dotenv import load_dotenv
 import os
 from docx import Document
-from llama_index.llms import TogetherLLM
-from llama_index.llms.base import ChatMessage, MessageRole
+from llama_index.llms.together import TogetherLLM
+from llama_index.core.llms import ChatMessage, MessageRole
 from Bio import Entrez 
 import ssl
+from transformers import AutoModelForSequenceClassification, AutoTokenizer
 import streamlit as st
 from googleapiclient.discovery import build
 from typing import List, Optional