def add_make_abundance_io_arguments(arg_parser):
    """Add io arguments to parser."""
    helpstr = "Input group file which associates collapsed isoforms with reads."
    arg_parser.add_argument("group_filename", type=str, help=helpstr)

    helpstr = "Input pickle file (e.g., hq_lq_pre_dict.pickle) which maps HQ " + \
              "(LQ) isoforms' sample prefixes to cluster output directories."
    arg_parser.add_argument("pickle_filename", type=str, help=helpstr)

    helpstr = "Output read status file."
    arg_parser.add_argument("output_read_stat_filename", type=str, help=helpstr)

    helpstr = "Output abundance file."
    arg_parser.add_argument("output_abundance_filename", type=str, help=helpstr)
    return arg_parser