Fix stale lookup parameters (#1401)
Fix stale lookup parameters (#1401)


shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,chunyang-wen/dynet,clab/cnn,shuheik/dynet,clab/cnn,shuheik/dynet,chunyang-wen/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,clab/dynet,chunyang-wen/dynet,danielhers/dynet,clab/dynet,clab/dynet,shuheik/dynet,clab/cnn,shuheik/dynet,clab/dynet,clab/dynet