parse data_attrs into DataDesc format and check that names match

def _parse_data_desc(data_names, label_names, data_shapes, label_shapes):
    """parse data_attrs into DataDesc format and check that names match"""
    data_shapes = [x if isinstance(x, DataDesc) else DataDesc(*x) for x in data_shapes]
    _check_names_match(data_names, data_shapes, 'data', True)
    if label_shapes is not None:
        label_shapes = [x if isinstance(x, DataDesc) else DataDesc(*x) for x in label_shapes]
        _check_names_match(label_names, label_shapes, 'label', False)
    else:
        _check_names_match(label_names, [], 'label', False)
    return data_shapes, label_shapes