From b93e863a1c5f31e9404dee8a2a6684119b876a2a Mon Sep 17 00:00:00 2001
From: dangqingqing <dangqingqing@baidu.com>
Date: Wed, 28 Jun 2017 20:02:52 +0800
Subject: [PATCH] Fix bug in MultiGradientMachine.

---
 paddle/gserver/gradientmachines/MultiGradientMachine.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/gserver/gradientmachines/MultiGradientMachine.cpp b/paddle/gserver/gradientmachines/MultiGradientMachine.cpp
index 8ef5e9d0c1..018da6c76d 100644
--- a/paddle/gserver/gradientmachines/MultiGradientMachine.cpp
+++ b/paddle/gserver/gradientmachines/MultiGradientMachine.cpp
@@ -601,7 +601,7 @@ void TrainerThread::backward() {
 
 void TrainerThread::backwardCallback(Parameter* para) {
   // CPU parameters are merged in the end
-  if (!para->useGpu()) return;
+  if (!para->useGpu() || para->isStatic()) return;
 
   int paramId = para->getID();
   if (multiMachine_->getNumThreads() == 1) {
-- 
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