Update app.py

app.py

@@ -4,7 +4,9 @@ from langchain_core.prompts import ChatPromptTemplate
 from langchain.chains.combine_documents import create_stuff_documents_chain
 from langchain.chains import create_retrieval_chain
 from langchain import HuggingFaceHub
+import os
 
+os.environ["HUGGINGFACEHUB_API_TOKEN"] = window.huggingface.hf_token
 
 llm = HuggingFaceHub(repo_id="tiiuae/falcon-7b-instruct",
                              model_kwargs={"max_length": 300, "max_new_tokens": 300})