From 4d0aaf96eab401a06ebc6db9078a2ba2856c0b4a Mon Sep 17 00:00:00 2001
From: zhangxiaoli73 <380761639@qq.com>
Date: Tue, 19 Sep 2017 13:34:00 +0800
Subject: [PATCH] optimize copy in recurrent (#1556)

* optimize copy in recurrent

* add more unit test

* select optimize

* meet review