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Master node

As explained in Sutskever's List

A master node is an artificial graph node that aggregates information from other nodes and broadcasts global information back to them.

In a message passing neural network, information from a distant node may take many rounds to reach another node. A master node offers a hub: it collects information from across the graph, holds an aggregate as a global scratch space, then broadcasts it to the other nodes in the next step. section 7.3.2

A molecular graph

Treat atoms as nodes. Instead of relying only on messages passed between neighboring atoms, the master node gathers information across the molecule and makes it available to all nodes. section 7.3.2

How Sutskever's List covers it

How deep it goes
Explains the hub mechanism and its role in global communication without detailing its implementation.
Examples
Uses atoms in a molecule as nodes and describes a hub collecting and broadcasting their information.
What you can do after
Understand how an artificial hub can shorten routes for long-range graph communication.
How it connects
Connects message passing neural networks with virtual edges and graph-level molecular prediction.
Cover of Sutskever's List
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