updated

app.py

@@ -91,6 +91,10 @@ def init_hf_model() -> None:
     _hf_model = model
     _hf_tokenizer = tokenizer
 
+HF_MODEL_NAME = "facebook/blenderbot-400M-distill"
+_chatbot_embedder = None
+_chatbot_collection = None
+
 def init_chatbot() -> None:
     """Initialise the Chroma vector DB with chatbot.txt content."""
     global _chatbot_embedder, _chatbot_collection