static Seq<Tuple2<String, Integer>> loadWeightEntries(final String path) {
        Preconditions.checkArgument(Objects.nonNull(path) && path.endsWith("weight"), "invalid path");
        final Config weight = CfgUtil.cfg.getConfig(path);
        final Map<String, Integer> map = weight.root().keySet().stream().collect(Collectors.toMap(k -> k, weight::getInt));
        return List.ofAll(map.entrySet().stream().map(e -> Tuple.of(e.getKey(), e.getValue()))).sortBy(t -> t._1);
    }