def preload(parser):
    parser.add_argument("--controlnet-dir", type=str, help="Path to directory with ControlNet models", default=None)
    parser.add_argument("--controlnet-annotator-models-path", type=str, help="Path to directory with annotator model directories", default=None)
    parser.add_argument("--no-half-controlnet", action='store_true', help="do not switch the ControlNet models to 16-bit floats (only needed without --no-half)", default=None)
    # Setting default max_size=16 as each cache entry contains image as both key 
    # and value (Very costly).
    parser.add_argument(
        "--controlnet-preprocessor-cache-size",
        type=int,
        help="Cache size for controlnet preprocessor results",
        default=16,
    )