reorganize a bit.
reorganize a bit.


Former-commit-id: ec203dca3df1ce27eeebbea77d27318ff38b1be4
clab/dynet,danielhers/dynet,clab/dynet,clab/cnn,shuheik/dynet,chunyang-wen/dynet,shuheik/dynet,danielhers/dynet,xunzhang/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,clab/dynet,clab/cnn,chunyang-wen/dynet,shuheik/dynet,shuheik/dynet,xunzhang/dynet,clab/cnn,xunzhang/dynet,shuheik/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,chunyang-wen/dynet,danielhers/dynet,clab/dynet,danielhers/dynet,xunzhang/dynet,shuheik/dynet,danielhers/dynet