fix compile error
fix compile error

shuheik/dynet,danielhers/dynet,clab/dynet,cherryc/dynet,danielhers/dynet,kaishengyao/cnn,cherryc/dynet,danielhers/dynet,chunyang-wen/dynet,shuheik/dynet,danielhers/dynet,Abasyoni/dynet,dhgarrette/cnn,xunzhang/dynet,Abasyoni/dynet,Peilun-Li/dynet,clab/cnn,clab/dynet,clab/cnn,yanweifu/cnn,xunzhang/dynet,shuheik/dynet,chunyang-wen/dynet,zhangscth/cnn,cherryc/dynet,echohenry2006/cnn,Peilun-Li/dynet,xunzhang/dynet,mitchellstern/dynet,clab/dynet,clab/dynet,kamigaito/cnn,shuheik/dynet,shuheik/dynet,Abasyoni/dynet,shuheik/dynet,clab/dynet,kaishengyao/cnn,danielhers/dynet,Peilun-Li/dynet,clab/cnn,shuheik/dynet,danielhers/dynet,mrzu/cnn,dhgarrette/cnn,chunyang-wen/dynet,kamigaito/cnn,clab/dynet,danielhers/dynet,xunzhang/dynet,yoavg/cnn,Aureliu/cnn,mitchellstern/dynet,chunyang-wen/dynet,clab/dynet,ndnlp/cnn,dhgarrette/cnn,yoavg/cnn