Made broadcasting of affine transform more efficient
Made broadcasting of affine transform more efficient


Former-commit-id: 99a7fc970918e25003aad7166ac93143ab30b82a
xunzhang/dynet,xunzhang/dynet,shuheik/dynet,danielhers/dynet,xunzhang/dynet,clab/dynet,clab/dynet,clab/dynet,chunyang-wen/dynet,shuheik/dynet,shuheik/dynet,xunzhang/dynet,clab/cnn,clab/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,clab/dynet,chunyang-wen/dynet,shuheik/dynet,chunyang-wen/dynet,chunyang-wen/dynet,danielhers/dynet,clab/cnn,clab/cnn,danielhers/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,danielhers/dynet,shuheik/dynet