BP算法的matlab实现
代码说明：
应用背景We provide some example Matlab code as a supplement to the paper [6]. This technical report is not intended as a standalone introduction to the belief propagation algorithm, but instead only aims to provide some technical material, which didn’t fit into the paper.关键技术In the graphical output generated in the previous section we observe that some trajectories seem to cease to exist and then possibly reappear later on. This effect is caused by round-off errors due to the numerical precision of the computations in Matlab. For very large arguments the tanh-function returns 1, and atanh(1) = 1. In theory though, finite arguments always give finite outputs, but number representation limits Matlab in actually producing accurate results after sometimes only a few iterations. Countermeasures employed, e.g., in [3], include to apply some saturation function after each iteration to
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