A few comments about expressions
A few comments about expressions


Former-commit-id: 213a01d079e31534ca07ab466d96bc83d8f6b739
shuheik/dynet,xunzhang/dynet,clab/dynet,clab/dynet,clab/dynet,shuheik/dynet,clab/dynet,clab/cnn,shuheik/dynet,chunyang-wen/dynet,clab/dynet,clab/cnn,danielhers/dynet,xunzhang/dynet,danielhers/dynet,clab/cnn,danielhers/dynet,clab/dynet,shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,shuheik/dynet,danielhers/dynet,shuheik/dynet,shuheik/dynet,xunzhang/dynet,xunzhang/dynet,danielhers/dynet,chunyang-wen/dynet,chunyang-wen/dynet,clab/dynet,danielhers/dynet