From 331cc262c91d891a6f3b54ef2f1a4671721fd732 Mon Sep 17 00:00:00 2001
From: Jerry Wu <wzhongyuan@gmail.com>
Date: Thu, 28 Dec 2017 13:51:35 +0800
Subject: [PATCH] graph ser to support control node (#2121)

* graph ser to support control node

* add unit test

* refinement

* refinement