Fixed overly aggressive dimension checking
Fixed overly aggressive dimension checking


Former-commit-id: eba3a001f09994a7d2b8771f42d755a54f1ae6b6
danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,chunyang-wen/dynet,shuheik/dynet,clab/cnn,clab/dynet,clab/dynet,clab/dynet,xunzhang/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,clab/dynet,xunzhang/dynet,xunzhang/dynet,chunyang-wen/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,clab/cnn,clab/cnn,shuheik/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,xunzhang/dynet,chunyang-wen/dynet,danielhers/dynet