Update app.py

app.py

@@ -8,6 +8,13 @@ from langchain.chains import RetrievalQA
 from langchain_community.llms import HuggingFacePipeline
 from transformers import pipeline, AutoTokenizer
 
+# Optional but recommended addition
+from huggingface_hub import login
+import os
+
+if os.environ.get("HF_TOKEN"):
+    login(token=os.environ["HF_TOKEN"])  # No hardcoded tokens!
+
 def load_documents(file_path="study_materials"):
     documents = []
     for filename in os.listdir(file_path):