On-Line Inference for Multiple Changepoint Problems
多重变点问题的在线推断AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究多重变点数量、位置及在线分段,支持结构变化方法方向,但其明确应用为基因组序列,未提供宏观实证。
多重变点问题的在线推断AI 解读 ↓
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Summary We propose an on-line algorithm for exact filtering of multiple changepoint problems. This algorithm enables simulation from the true joint posterior distribution of the number and position of the changepoints for a class of changepoint models. The computational cost of this exact algorithm is quadratic in the number of observations. We further show how resampling ideas from particle filters can be used to reduce the computational cost to linear in the number of observations, at the expense of introducing small errors, and we propose two new, optimum resampling algorithms for this problem. One, a version of rejection control, allows the particle filter to choose the number of particles that are required at each time step automatically. The new resampling algorithms substantially outperform standard resampling algorithms on examples that we consider; and we demonstrate how the resulting particle filter is practicable for segmentation of human G+C content.