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The key differences in the implementation of the algorithm / in the passing of the messages are as follows: messages in BP are passed only once; in contrast, messages in loopy BP (LBP) are passed iteratively until "convergence is reached" (convergence means that the belief does not change anymore from one iteration to the other). in a Bayesian ...


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Cycles are redundant, that's all. And it is pretty easy to show if you think about the transitivity. A -> B -> C -> A implies A -> B and B -> A So the directionality is immediately lost (for every pair in the loop). A -> B -> C -> A is also deterministic, the multiplier is one. For example: Say B = (1/3)A + e1 and C = (1/2)B + e2; ...


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