From 57f57ead32e8f0fe4b89c094ae17fb2926336047 Mon Sep 17 00:00:00 2001
From: Yu Yang <yuyang18@baidu.com>
Date: Thu, 3 Aug 2017 14:58:39 +0800
Subject: [PATCH] Add @EMPTY@ to default no_grad_vars in `Backward`

---
 paddle/framework/backward.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/paddle/framework/backward.cc b/paddle/framework/backward.cc
index 0da11b91a7f..e784bb2b7d7 100644
--- a/paddle/framework/backward.cc
+++ b/paddle/framework/backward.cc
@@ -168,6 +168,9 @@ std::shared_ptr<OperatorBase> Backward(
   std::unordered_set<std::string> no_grad_names;
   no_grad_names.reserve(no_grad_vars.size());
 
+  no_grad_names.insert(OperatorBase::EMPTY_VAR_NAME() +
+                       OperatorBase::GRAD_VAR_SUFFIX());
+
   for (auto& name : no_grad_vars) {
     no_grad_names.insert(name + OperatorBase::GRAD_VAR_SUFFIX());
   }
-- 
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