Update app.py

app.py

@@ -9,6 +9,14 @@ from langchain.llms import HuggingFacePipeline
 from langchain.prompts import ChatPromptTemplate, MessagesPlaceholder
 from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig, pipeline
 
+import os
+from huggingface_hub import login
+
+# Authenticate using the token stored in the environment variable
+hf_token = os.getenv("SP_7")
+login(token=hf_token)
+
+
 # Load the pre-existing vector store
 vector_store = Chroma(persist_directory="./bg_data_english")
 similarity_retriever = vector_store.as_retriever(