Update app.py

app.py

@@ -263,8 +263,8 @@ def build_qa_chain(collection_name, vector_db, file: str):
     
     """
     #vincent for new LLM
-    #llm_model = "TinyLlama/TinyLlama-1.1B-Chat-v1.0"
-    llm_model = "meta-llama/Llama-2-7b-chat-hf"
+    llm_model = "TinyLlama/TinyLlama-1.1B-Chat-v1.0"
+    #llm_model = "meta-llama/Llama-2-7b-chat-hf"
     llm = HuggingFaceEndpoint(
             repo_id=llm_model, 
             task="text-generation",  # Explicitly specify task