Factor Graph
Table of contents
A Factor graph also has squares, which represent a factor (non negative function) of its neighbouring variables. They are useful for performing efficient computations (not just for probability).
The joint function is the product of all factors:
\[f(A,B,C,D,E) = f_1(A,B)f_2(B,C,D)f_3(C,E)f_4(D,E)\]