fix spacing.
fix spacing.


Former-commit-id: 199d04d3960baa944e9d62b7462fdbcbed0714d9
chunyang-wen/dynet,clab/cnn,shuheik/dynet,xunzhang/dynet,danielhers/dynet,danielhers/dynet,shuheik/dynet,xunzhang/dynet,xunzhang/dynet,clab/dynet,chunyang-wen/dynet,clab/cnn,chunyang-wen/dynet,clab/dynet,clab/dynet,clab/dynet,shuheik/dynet,clab/dynet,clab/cnn,danielhers/dynet,danielhers/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,chunyang-wen/dynet,xunzhang/dynet,danielhers/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,shuheik/dynet,shuheik/dynet