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Continuous Correlated Beta Processes

机译:连续相关的Beta过程

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摘要

In this paper we consider a (possibly continuous) space of Bernoulli experiments. We assume that the Bernoulli distributions are correlated. All evidence data comes in the form of successful or failed experiments at different points. Current state-of-the- art methods for expressing a distribution over a continuum of Bernoulli distributions use logistic Gaussian processes or Gaussian copula processes. However, both of these require computationally expensive matrix operations (cubic in the general case). We introduce a more intuitive approach, directly correlating beta distributions by sharing evidence between them according to a kernel function, an approach which has linear time complexity. The approach can easily be extended to multiple outcomes, giving a continuous correlated Dirichlet process, and can be used for both classification and learning the actual probabilities of the Bernoulli distributions. We show results for a number of data sets, as well as a case-study where a mixture of continuous beta processes is used as part of an automated stroke rehabilitation system.
机译:在本文中,我们考虑了Bernoulli实验的(可能是连续的)空间。我们假设Bernoulli分布是相关的。所有证据数据都以不同点的成功或失败的实验形式出现。目前最先进的方法,用于在伯努利分布的连续体上表达分布使用Logistic Gaussian进程或高斯Copula工艺。然而,这两者都需要计算昂贵的矩阵操作(一般情况下的立方)。我们介绍了一种更直观的方法,通过根据内核函数在它们之间分享证据来直接关联Beta分布,这是一种具有线性时间复杂度的方法。该方法可以很容易地扩展到多个结果,给出连续相关的Dirichlet过程,并且可以用于分类和学习Bernoulli分布的实际概率。我们向结果显示了许多数据集,以及案例研究,其中连续β过程的混合物用作自动笔划康复系统的一部分。

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