code: def __init__(self):
      super().__init__()
      self.self_pickling_work = SelfPicklingWork()
      self.work_that_loads_pickled_work = WorkThatLoadsPickledWork()
  
file_path: pytorch-lightning/tests/tests_app/utilities/testdata/safe_pickle_app.py
imports: import subprocess
  from pathlib import Path
  from lightning.app import LightningApp, LightningFlow, LightningWork
  from lightning.app.utilities import safe_pickle
label_desc: Use image node_id 1 to create a new RootFlow object from inherited base classes: LightningFlow with example: obj = RootFlow()