code: def main(argv=None):
      """Main entry point."""
      known_args = parse_cmdline(argv)
      metrics_dir = known_args.metrics_dir
      metrics_files = [
          join(metrics_dir, f)
          for f in listdir(metrics_dir)
          if isfile(join(metrics_dir, f))
      ]
      metrics = [read_metrics_file(f) for f in metrics_files]
      for m in metrics:
          print(
              "%s\t%s\t%s"
              % (m["checkpoint"], m["TPs+FNs_All"], m["F1_All"])
          )
  
file_path: deepvariant/tools/print_f1.py
imports: import argparse
  import json
  import logging
  from os import listdir
  from os.path import isfile
  from os.path import join
  import re
label_desc: Use image node_id 4 for calling a global function with example usage: main(argv) without return types