Update nodes.cc
Update nodes.cc

Former-commit-id: 6b7d49868851975a961b1461751974ef69d87a6c
clab/cnn,chunyang-wen/dynet,shuheik/dynet,clab/dynet,xunzhang/dynet,chunyang-wen/dynet,shuheik/dynet,chunyang-wen/dynet,clab/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,xunzhang/dynet,clab/cnn,clab/dynet,clab/dynet,xunzhang/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,clab/cnn,xunzhang/dynet,chunyang-wen/dynet,danielhers/dynet,danielhers/dynet