code: def bool_flag(value):
      if value.lower() in ("true", "t", "1"):
          return True
      elif value.lower() in ("false", "f", "0"):
          return False
      else:
          raise argparse.ArgumentTypeError(
              f"Expected boolean string such as 'true'/'false' instead of {value}."
          )
  
imports: import argparse
  import ast
  import os
  import signal
  import threading
  import time
  from typing import Dict, List, Optional, Union
  import torch
  from fairseq import distributed_utils, tasks, utils
  from pytorch_translate.file_io import PathManager
label_desc: Use image node_id 1 for calling a global function with example usage: bool_flag(value) and returns: True, False