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关于beta在传递较深的层次的时候可能消失的备注
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SmirkCao committed Sep 18, 2018
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这里需要**注意**下, 按照后向算法, $\beta$在递推过程中会越来越小, 如果层数较多, 怕是$P(O|\lambda)$会消失

#### 小结

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