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Update hmm.py #27

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Update hmm.py #27

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@IamHehe IamHehe commented Aug 11, 2020

1.修改注释中Viterbi的递推公式中的错误(参见统计学习方法(第二版)209页);2.优化decoding获取最大值部分,矩阵加法替代循环,时间复杂度从O(n^2)到O(n)。

1.修改注释中Viterbi的递推公式中的错误(参见统计学习方法(第二版)209页);2.优化decoding获取最大值部分,矩阵加法替代循环,时间复杂度从O(n^2)到O(n)。
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