code: def run(self, x):
      # compile
      process = subprocess.Popen("g++ model_server.cpp -o model_server")
      process.wait()
      process = subprocess.Popen("./model_server")
      process.wait()
  
file_path: pytorch-lightning/docs/source-app/levels/intermediate/level_2_scripts/organized_app_python.py
imports: import subprocess
  from lightning.app import LightningWork, LightningFlow, LightningApp, CloudCompute
label_desc: Use image node_id 1 for calling the ExternalModelServer obj's underlying member method code with example usage: obj.run(x) without return types