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arXiv math/0401342math.CO
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维特比序列与多面体

Viterbi Sequences and Polytopes

Eric H. Kuo

摘要:

离散马尔可夫链的长度为n的维特比路径是在马尔可夫链中具有最大发生概率的n+1个状态的序列。我们将所有马尔可夫链的空间划分成维特比区域,其中两个马尔可夫链如果具有相同的维特比路径集,则它们在同一区域中。正测度区域的维特比路径称为维特比序列。我们的主要结果是:(1)每个Viterbi序列可以分为前缀、周期内部和后缀;(2)当n增加到无穷大(状态数保持不变)时,Viterbi区域的数量保持有界。维特比区域对应于多项式的牛顿多面体的顶点,多项式的项是长度为n的序列的概率。我们刻画了二态和三态马尔可夫链的维特比序列和多面体。

英文摘要:

A Viterbi path of length n of a discrete Markov chain is a sequence of n+1 states that has the greatest probability of ocurring in the Markov chain. We divide the space of all Markov chains into Viterbi regions in which two Markov chains are in the same region if they have the same set of Viterbi paths. The Viterbi paths of regions of positive measure are called Viterbi sequences. Our main results are (1) each Viterbi sequence can be divided into a prefix, periodic interior, and suffix, and (2) as n increases to infinity (and the number of states remains fixed), the number of Viterbi regions remains bounded. The Viterbi regions correspond to the vertices of a Newton polytope of a polynomial whose terms are the probabilities of sequences of length n. We characterize Viterbi sequences and polytopes for two- and three-state Markov chains.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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