From 46a7195bbe17f06be95e5ae66f2f40dc0b0cd423 Mon Sep 17 00:00:00 2001
From: Ian Wong <yiheng.wang@intel.com>
Date: Wed, 27 Sep 2017 17:13:42 +0800
Subject: [PATCH] 1. throw exception when ConcatTable contains no submodule
 (#1598)

2. rescursive remove stopGradient nodes