code: def parse_args():
      parser = argparse.ArgumentParser(
          "Official evaluation script for SQuAD version 2.0."
      )
      parser.add_argument(
          "data_file", metavar="data.json", help="Input data JSON file."
      )
      parser.add_argument(
          "pred_file", metavar="pred.json", help="Model predictions."
      )
      parser.add_argument(
          "--out-file",
          "-o",
          metavar="eval.json",
          help="Write accuracy metrics to file (default is stdout).",
      )
      parser.add_argument(
          "--na-prob-file",
          "-n",
          metavar="na_prob.json",
          help="Model estimates of probability of no answer.",
      )
      parser.add_argument(
          "--na-prob-thresh",
          "-t",
          type=float,
          default=1.0,
          help='Predict "" if no-answer probability exceeds this (default = 1.0).',
      )
      parser.add_argument(
          "--out-image-dir",
          "-p",
          metavar="out_images",
          default=None,
          help="Save precision-recall curves to directory.",
      )
      parser.add_argument("--verbose", "-v", action="store_true")
      if len(sys.argv) == 1:
          parser.print_help()
          sys.exit(1)
      return parser.parse_args()
  
imports: import argparse
  import collections
  import json
  import numpy
  import os
  import re
  import string
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: parse_args() and returns: parser