code: async def validate(state, holdout_glob):
    
  
    if not glob.glob(holdout_glob):
      print('Glob "{}" didn\'t match any files, skipping validation'.format(
            holdout_glob))
    else:
      await run(
          'python3', 'validate.py', holdout_glob,
          '--flagfile={}'.format(os.path.join(FLAGS.flags_dir, 'validate.flags')),
          '--work_dir={}'.format(fsdb.working_dir()))
docs: Validate the trained model against holdout games.
  
    Args:
      state: the RL loop State instance.
      holdout_glob: a glob that matches holdout games.