Update app.py

app.py

@@ -5,11 +5,11 @@ from langchain_community.document_loaders import PyPDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
 from langchain.chains import ConversationalRetrievalChain
-from langchain_huggingface import HuggingFaceEmbeddings 
+from langchain_huggingface import HuggingFaceEmbeddings , HuggingFaceEndpoint  
 from langchain_community.llms import HuggingFacePipeline
 from langchain.chains import ConversationChain
 from langchain.memory import ConversationBufferMemory
-from langchain_community.llms import HuggingFaceEndpoint
+
 
 from pathlib import Path
 import chromadb
@@ -22,7 +22,7 @@ import tqdm
 import accelerate
 import re
 
-
+os.environ["HUGGINGFACEHUB_API_TOKEN"] = os.getenv("HUGGINGFACEHUB_API_TOKEN")
 list_llm = ["mistralai/Mistral-7B-Instruct-v0.2"]
 list_llm_simple = [os.path.basename(llm) for llm in list_llm]