def add_base_args(parser):
    """Add the base nerf arguments to the parser

    Args:
        parser (ArgumentParser): the current ArgumentParser.

    Returns:
        ArgumentParser: the modified ArgumentParser for call chaining
    """
    parser.add_argument(
        "--perturb",
        type=float,
        default=1.0,
        help="set to 0. for no jitter, 1. for jitter",
    )
    parser.add_argument(
        "--raw_noise_std",
        type=float,
        default=0.0,
        help="std dev of noise added to regularize sigma_a output, 1e0 recommended",
    )

    return parser