code: def run(self, x):
      print(f"train a model on {x}")
  
file_path: pytorch-lightning/docs/source-app/levels/intermediate/level_2_scripts/hello_app.py
imports: from lightning.app import LightningWork, LightningFlow, LightningApp, CloudCompute
label_desc: Use image node_id 1 for calling the TrainComponent obj's underlying member method code with example usage: obj.run(x) without return types