def add_parser_arguments(parser):
    """Add arguments to an `argparse.ArgumentParser`."""
    parser.add_argument(
        '--data',
        type=str,
        help='path to AnnData object with "spliced", "unspliced", "ambiguous" in `.layers`',
    )
    parser.add_argument(
        '--out_path',
        type=str,
        help='output path for velocity bootstrap samples.'
    )
    parser.add_argument(
        '--n_iter',
        type=int,
        default=100,
        help='number of bootstrap iterations to perform.'
    )
    return parser