<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def main(args):
 """ Validates the submission. """

  print_in_box('Validating submission ' + args.submission_filename)
  random.seed()
  temp_dir = args.temp_dir
  delete_temp_dir = False
  if not temp_dir:
    temp_dir = tempfile.mkdtemp()
    logging.info('Created temporary directory: %s', temp_dir)
    delete_temp_dir = True
  validator = submission_validator_lib.SubmissionValidator(temp_dir,
                                                           args.use_gpu)
  if validator.validate_submission(args.submission_filename,
                                   args.submission_type):
    print_in_box('Submission is VALID!')
  else:
    print_in_box('Submission is INVALID, see log messages for details')
  if delete_temp_dir:
    logging.info('Deleting temporary directory: %s', temp_dir)
    subprocess.call(['rm', '-rf', temp_dir])