def all_dict_combinations(varied_dict):
    """
    all_dict_combinations

    Args:
        varied_dict (dict):  a dict with lists of possible parameter settings

    Returns:
        list: dict_list a list of dicts correpsonding to all combinations of params settings

    CommandLine:
        python -m utool.util_dict --test-all_dict_combinations

    Example:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_dict import *  # NOQA
        >>> import utool as ut
        >>> varied_dict = {'logdist_weight': [0.0, 1.0], 'pipeline_root': ['vsmany'], 'sv_on': [True, False, None]}
        >>> dict_list = all_dict_combinations(varied_dict)
        >>> result = str(ut.repr4(dict_list))
        >>> print(result)
        [
            {'logdist_weight': 0.0, 'pipeline_root': 'vsmany', 'sv_on': True},
            {'logdist_weight': 0.0, 'pipeline_root': 'vsmany', 'sv_on': False},
            {'logdist_weight': 0.0, 'pipeline_root': 'vsmany', 'sv_on': None},
            {'logdist_weight': 1.0, 'pipeline_root': 'vsmany', 'sv_on': True},
            {'logdist_weight': 1.0, 'pipeline_root': 'vsmany', 'sv_on': False},
            {'logdist_weight': 1.0, 'pipeline_root': 'vsmany', 'sv_on': None},
        ]
    """
    #tups_list = [[(key, val) for val in val_list]
    #             if isinstance(val_list, (list, tuple))
    #             else [(key, val_list)]
    #             for (key, val_list) in six.iteritems(varied_dict)]
    tups_list = [[(key, val) for val in val_list]
                 if isinstance(val_list, (list))
                 #if isinstance(val_list, (list, tuple))
                 else [(key, val_list)]
                 for (key, val_list) in iteritems_sorted(varied_dict)]
    dict_list = [dict(tups) for tups in it.product(*tups_list)]
    #dict_list = [{key: val for (key, val) in tups} for tups in it.product(*tups_list)]
    #from collections import OrderedDict
    #dict_list = [OrderedDict([(key, val) for (key, val) in tups]) for tups in it.product(*tups_list)]
    return dict_list