arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2311.00564stat.MLcs.LG
收藏

面向非平稳数据建模的具有整体-局部尺度结构的在线学生t过程

Online Student-$t$ Processes with an Overall-local Scale Structure for Modelling Non-stationary Data

Taole Sha, Michael Minyi Zhang

AI总结:

本文针对非平稳和重尾误差的时间数据建模问题,提出具有整体-局部协方差尺度结构的贝叶斯学生t过程混合模型,并结合序贯蒙特卡洛方法实现在线推断,在真实数据集上验证了其优于高斯过程模型。

摘要:

时间相关数据往往表现出非平稳性和重尾误差等特征,这些特征不适合用流行模型中的典型假设来建模。因此,需要更灵活的方法来适应这些问题。为此,我们提出了一种贝叶斯学生t过程混合模型,其协方差具有整体-局部尺度结构。此外,我们使用序贯蒙特卡洛(SMC)采样器,以便在数据实时到达时进行在线推断。我们在真实世界数据集上证明了所提方法相较于典型高斯过程模型的优越性,从而证明使用学生t过程混合模型的必要性。

英文摘要:

Time-dependent data often exhibit characteristics, such as non-stationarity and heavy-tailed errors, that would be inappropriate to model with the typical assumptions used in popular models. Thus, more flexible approaches are required to be able to accommodate such issues. To this end, we propose a Bayesian mixture of student-$t$ processes with an overall-local scale structure for the covariance. Moreover, we use a sequential Monte Carlo (SMC) sampler in order to perform online inference as data arrive in real-time. We demonstrate the superiority of our proposed approach compared to typical Gaussian process-based models on real-world data sets in order to prove the necessity of using mixtures of student-$t$ processes.

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。

↑