fixed an edge case for largest in the backward loop. Hint: what should largest be initialized to?
fixed an edge case for largest in the backward loop. Hint: what should largest be initialized to?


Former-commit-id: eaba2cda741979414f56c9521e005270dbb05bd1
shuheik/dynet,xunzhang/dynet,shuheik/dynet,clab/cnn,xunzhang/dynet,shuheik/dynet,clab/dynet,clab/dynet,clab/dynet,shuheik/dynet,clab/cnn,danielhers/dynet,clab/cnn,danielhers/dynet,clab/dynet,clab/dynet,xunzhang/dynet,xunzhang/dynet,shuheik/dynet,chunyang-wen/dynet,danielhers/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,chunyang-wen/dynet,chunyang-wen/dynet,chunyang-wen/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,clab/dynet