DGLGraph.send(edges='__ALL__', message_func='default')[source]

Send messages along the given edges.

edges can be any of the following types:

  • int : Specify one edge using its edge id.
  • pair of int : Specify one edge using its endpoints.
  • int iterable / tensor : Specify multiple edges using their edge ids.
  • pair of int iterable / pair of tensors : Specify multiple edges using their endpoints.

The UDF returns messages on the edges and can be later fetched in the destination node’s mailbox. Receiving will consume the messages. See recv() for example.

If multiple send are triggered on the same edge without recv. Messages generated by the later send will overwrite previous messages.

  • edges (valid edges type, optional) – Edges on which to apply message_func. Default is sending along all the edges.
  • message_func (callable) – Message function on the edges. The function should be an Edge UDF.


On multigraphs, if \(u\) and \(v\) are specified, then the messages will be sent along all edges between \(u\) and \(v\).


See the message passing example in DGLGraph or recv().