Update LLM model references in app.py

app.py

@@ -15,7 +15,7 @@ from langchain.memory import ConversationBufferMemory
 from langchain_community.llms import HuggingFaceEndpoint
 import torch
 
-list_llm = ["meta-llama/Llama-3.3-70B-Instruct", "Qwen/Qwen2-VL-7B-Instruct"]  
+list_llm = ["meta-llama/Meta-Llama-3-8B-Instruct", "mistralai/Mistral-7B-Instruct-v0.2"]  
 list_llm_simple = [os.path.basename(llm) for llm in list_llm]
 
 # Load and split PDF document