From ec031c72a0592c5625ddfce606d2215d7acc8eee Mon Sep 17 00:00:00 2001
From: Yao Zhang <psyyz10@nottingham.ac.uk>
Date: Mon, 16 Oct 2017 17:29:30 +0800
Subject: [PATCH] Add BroadcastGradientArgs (#1658)

* finish BroadcastGradientArgs

* remove breeze

* pass the tests

* refine the function

* fix scala style

* while instead of for