贝叶斯网络的matlab实现。可以创建贝叶斯网络、训练模型

				function pi = CPD_to_pi(CPD, msg_type, n, ps, msg, evidence)
				% CPD_TO_PI Compute the pi vector (root)
				% function pi = CPD_to_pi(CPD, msg_type, n, ps, msg, evidence)
				
				self_ev = evidence{n};
				switch msg_type
				 case 'd',
				  error('root_CPD can''t create discrete msgs')
				 case 'g',
				  pi.mu = self_ev;
				  pi.Sigma = zeros(size(self_ev));
				end