code: def state_dict(self):
      return {"state": self.state}
  
file_path: pytorch-lightning/tests/tests_pytorch/callbacks/test_callbacks.py
imports: from pathlib import Path
  from re import escape
  from unittest.mock import Mock
  import pytest
  from lightning.pytorch import Callback, Trainer
  from lightning.pytorch.callbacks import ModelCheckpoint
  from lightning.pytorch.demos.boring_classes import BoringModel
  from lightning_utilities.test.warning import no_warning_call
label_desc: Use image node_id 3 for calling the OldStatefulCallback obj's underlying member method code with example usage: obj.state_dict() and returns: dict