code: def start_server():
      os.system("torchserve --start --model-store model_store --ncs")
      st.session_state.started = True
      st.session_state.stopped = False
      st.session_state.registered = False
  
file_path: serve/examples/LLM/llama2/chat_app/torchserve_server_app.py
imports: import json
  import os
  import requests
  import streamlit
label_desc: Use image node_id 1 for calling a global function with example usage: start_server() without return types