def gff2to3_parser(subparsers):
    """
    Parser for the gff2to3 tool.
    """
    parser = subparsers.add_parser('gff2to3', help=
        'convert a GFF2 file to the GFF3 format', description=
        'Convert a GFF2 file to the GFF3 format')
    parser.add_argument('gff2_file', help='a GFF2 file')
    parser.add_argument('output_file', help='the output GFF3 file')
    parser.add_argument('-i', '--ignore_incorrect_records', action=
        'store_true', help=
        'ignore incorrect records in the specified input GFF2 file')
