fix test failure
fix test failure


Former-commit-id: 31922b3f38f6185762221f9f80997d1cf24e47e0
danielhers/dynet,clab/cnn,shuheik/dynet,shuheik/dynet,chunyang-wen/dynet,clab/dynet,danielhers/dynet,clab/dynet,chunyang-wen/dynet,danielhers/dynet,xunzhang/dynet,clab/cnn,shuheik/dynet,clab/dynet,xunzhang/dynet,danielhers/dynet,danielhers/dynet,chunyang-wen/dynet,xunzhang/dynet,danielhers/dynet,shuheik/dynet,xunzhang/dynet,clab/dynet,clab/dynet,clab/cnn,shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,clab/dynet,shuheik/dynet,clab/dynet,shuheik/dynet