Question: 8.20 ( ) www Consider the message passing protocol for the sum-product algorithm on a tree-structured factor graph in which messages are first propagated from

8.20 () www Consider the message passing protocol for the sum-product algorithm on a tree-structured factor graph in which messages are first propagated from the leaves to an arbitrarily chosen root node and then from the root node out to the leaves. Use proof by induction to show that the messages can be passed in such an order that at every step, each node that must send a message has received all of the incoming messages necessary to construct its outgoing messages.

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