def get_levels(dict_, n=0, levels=None):
    r"""
    DEPCIRATE

    Args:
        dict_ (dict_):  a dictionary
        n (int): (default = 0)
        levels (None): (default = None)

    CommandLine:
        python -m utool.util_graph --test-get_levels --show
        python3 -m utool.util_graph --test-get_levels --show

    Example:
        >>> # DISABLE_DOCTEST
        >>> from utool.util_graph import *  # NOQA
        >>> import utool as ut
        >>> from_root = {
        >>>     'dummy_annot': {
        >>>         'chip': {
        >>>                 'keypoint': {
        >>>                             'fgweight': None,
        >>>                         },
        >>>             },
        >>>         'probchip': {
        >>>                 'fgweight': None,
        >>>             },
        >>>     },
        >>> }
        >>> dict_ = from_root
        >>> n = 0
        >>> levels = None
        >>> levels_ = get_levels(dict_, n, levels)
        >>> result = ut.repr2(levels_, nl=1)
        >>> print(result)
        [
            ['dummy_annot'],
            ['chip', 'probchip'],
            ['keypoint', 'fgweight'],
            ['fgweight'],
        ]
    """
    if levels is None:
        levels_ = [[] for _ in range(dict_depth(dict_))]
    else:
        levels_ = levels
    if dict_ is None:
        return []
    for key in dict_.keys():
        levels_[n].append(key)
    for val in dict_.values():
        get_levels(val, n + 1, levels_)
    return levels_