modify DYNET_ARG_CHECK
modify DYNET_ARG_CHECK


Former-commit-id: a99dbffb071d1b6a18c4a1727170c87bcc70ff69
chunyang-wen/dynet,xunzhang/dynet,xunzhang/dynet,danielhers/dynet,clab/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,clab/dynet,shuheik/dynet,danielhers/dynet,clab/cnn,clab/cnn,shuheik/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,xunzhang/dynet,danielhers/dynet,clab/cnn,danielhers/dynet,shuheik/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,xunzhang/dynet,chunyang-wen/dynet,chunyang-wen/dynet,danielhers/dynet,danielhers/dynet