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arXiv cs/0211007cs.LG
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用em算法逼近不完全核矩阵

Approximating Incomplete Kernel Matrices by the em Algorithm

Koji Tsuda, Shotaro Akaho, Kiyoshi Asai

摘要:

在生物数据中,通常情况下,观察到的数据仅适用于样本的子集。当从这样的数据导出核矩阵时,我们必须将不可用样本的条目保留为缺失。在本文中,我们利用核矩阵的参数模型,并估计缺失的条目拟合模型现有的条目。参数模型被创建为从另一个信息源导出的完整核矩阵的一组谱变量。对于模型拟合,我们采用了基于正定矩阵信息几何的em算法。我们将报告使用两个标记序列:16S和gyrB的细菌聚类实验的有希望的结果。

英文摘要:

In biological data, it is often the case that observed data are available only for a subset of samples. When a kernel matrix is derived from such data, we have to leave the entries for unavailable samples as missing. In this paper, we make use of a parametric model of kernel matrices, and estimate missing entries by fitting the model to existing entries. The parametric model is created as a set of spectral variants of a complete kernel matrix derived from another information source. For model fitting, we adopt the em algorithm based on the information geometry of positive definite matrices. We will report promising results on bacteria clustering experiments using two marker sequences: 16S and gyrB.

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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