code: def main():
      parser = argparse.ArgumentParser(
          description="Convert a folder of PDFs to a folder of markdown files in chunks."
      )
      parser.add_argument("in_folder", help="Input folder with pdfs.")
      parser.add_argument("out_folder", help="Output folder")
      args = parser.parse_args()
  
      # Construct the command
      cmd = f"./chunk_convert.sh {args.in_folder} {args.out_folder}"
  
      # Execute the shell script
      subprocess.run(cmd, shell=True, check=True)
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types