To confirm the convention of edge_index

[zcaicaros]

Sorry for disturbing you guys with this stupid question. My algorithm does not work and I have been debugging for a long time. So I would like to confirm every bit of the implementation is as expected.

If I have a graph like below, two nodes A pointing to B

A -> B

which is directed acyclic graph (DAG), and I have a adjacency matrix for its connection, say

[[1, 1],
 [0, 1]]

the diagonals have value 1 meaning add self-loop for each node.

Next I want to create a torch_geometric.data.Data object with edge_index=[2, num_edges] convention. My question is,
which one should be passed, edge_index=[[0, 0, 1], [0, 1, 1]] or edge_index=[[0, 1, 1], [0, 0, 1]] if I use flow="source_to_target"

[wsad1]

Check out the description of MessagePassing.message(...) here, based on that to construct a message from A to B, set edge_index=[[0, 0, 1], [0, 1, 1]] if flow='source_to_target'.

[zcaicaros]

Thank you for your confirmation!