Viterbi算法

学习自 http://blog.ivank.net/viterbi-algorithm-clarified.html#:~:text=%20Viterbi%20Algorithm%20Clarified%20%201%20Defining%20a,problem%20is%20based%20on%20dynamic%20programming.%20More%20   维特比算法，作者举了一个例

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