Get game for the given worker (directory) id.

def get_game_for_worker(map_name, directory_id):
  """Get game for the given worker (directory) id."""
  if map_name == "v100unfriendly":
    games = ["chopper_command", "boxing", "asterix", "seaquest"]
    worker_per_game = 5
  elif map_name == "human_nice":
    games = gym_env.ATARI_GAMES_WITH_HUMAN_SCORE_NICE
    worker_per_game = 5
  else:
    raise ValueError("Unknown worker to game map name: %s" % map_name)
  games.sort()
  game_id = (directory_id - 1) // worker_per_game
  tf.logging.info("Getting game %d from %s." % (game_id, games))
  return games[game_id]