Hi

Thank you for this great tool. I noticed that there is a function that produces the edge frontiers generator using depth-first-search (DFS), i.e. `dgl.traversal.dfs_edges_generator`

. However, it seems that there is not such a function that produces the node frontiers using DFS, only those with BFS (`dgl.traversal.bfs_nodes_generator`

). I am curious why there is not such a function. Also, is it possible to implement it using current APIs? Thanks!

Best,