<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fill_subparser(subparser):
 """Sets up a subparser to convert the ILSVRC2012 dataset files. Parameters subparser : :class:`argparse.ArgumentParser` Subparser handling the `ilsvrc2012` command. """

    subparser.add_argument(
        "--shuffle-seed", help="Seed to use for randomizing order of the "
                               "training set on disk.",
        default=config.default_seed, type=int, required=False)
    return convert_ilsvrc2012