Difference between send(), recv() and update_all()?

Questions
#1

Hello Everyone. I am a PhD student learning DGL. I have one question regarding message passing. what is the difference between send(), recv() and update_all()? and also pros and cons?

I would also wanted to learn their internal working and implementation, so if anyone can refer me to the detail documents explaining their internal working?

#2

Hi, thanks for your interest. You can check out the general design of DGL in our paper [1909.01315] Deep Graph Library: A Graph-Centric, Highly-Performant Package for Graph Neural Networks. The core insight is that all message passing GNNs can be implemented by two operators G-SpMM and G-SDDMM, which corresponds to update_all() and apply_edges(). Other message passing APIs are built upon them. For example:

  • send() is the same as apply_edges that generate messages as edge data.
  • recv() is equal to update_all() with copy_e as the message function.
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#3

Thank you for your response. It is helpful and i am on it now.

#4

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