code: def _num_tasks(self) -> int:
      return 1
  
imports: import contextlib
  import pickle
  import subprocess
  import sys
  import time
  import typing
  from pathlib import Path
  from unittest.mock import patch
  import pytest
  from .None import core, submission, utils
label_desc: Use image node_id 2 for calling the FakeExecutor obj's underlying member method code with example usage: obj._num_tasks() and returns: int