code: def main(cmd=None):
      print(get_commandline_args(), file=sys.stderr)
      parser = get_parser()
      args = parser.parse_args(cmd)
      kwargs = vars(args)
      kwargs.pop("config", None)
      calc_perplexity(**kwargs)
  
file_path: espnet/espnet2/bin/lm_calc_perplexity.py
imports: import argparse
  import logging
  import sys
  from pathlib import Path
  from typing import Optional, Sequence, Tuple, Union
  import numpy
  import torch
  from torch.nn.parallel import data_parallel
  from typeguard import check_argument_types
  from espnet2.fileio.datadir_writer import DatadirWriter
  from espnet2.tasks.lm import LMTask
  from espnet2.torch_utils.device_funcs import to_device
  from espnet2.torch_utils.forward_adaptor import ForwardAdaptor
  from espnet2.torch_utils.set_all_random_seed import set_all_random_seed
  from espnet2.utils import config_argparse
  from espnet2.utils.types import float_or_none, str2bool, str2triple_str, str_or_none
  from espnet.utils.cli_utils import get_commandline_args
label_desc: Use image node_id 3 for calling a global function with example usage: main(cmd) without return types