get rid of extra const
get rid of extra const

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