Question: 8.26 ( ) Consider a tree-structured factor graph over discrete variables, and suppose we wish to evaluate the joint distribution p(xa, xb) associated with two

8.26 () Consider a tree-structured factor graph over discrete variables, and suppose we wish to evaluate the joint distribution p(xa, xb) associated with two variables xa and xb that do not belong to a common factor. Define a procedure for using the sumproduct algorithm to evaluate this joint distribution in which one of the variables is successively clamped to each of its allowed values.

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