dgl.topological_nodes_generator¶

dgl.topological_nodes_generator(graph, reverse=False)[source]¶

Node frontiers generator using topological traversal.

Parameters

graph (DGLHeteroGraph) – The graph object.
reverse (bool, optional) – If True, traverse following the in-edge direction.

Returns

Each node frontier is a list or tensor of node ids.

Return type

list of node frontiers

Examples

Given a graph (directed, edges from small node id to large):

      2 - 4
     / \
0 - 1 - 3 - 5

>>> g = dgl.graph(([0, 1, 1, 2, 2, 3], [1, 2, 3, 3, 4, 5]))
>>> list(dgl.topological_nodes_generator(g))
[tensor([0]), tensor([1]), tensor([2]), tensor([3, 4]), tensor([5])]