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arXiv 1004.5265stat.ML
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稀疏线性可辨识多变量建模

Sparse Linear Identifiable Multivariate Modeling

Ricardo Henao, Ole Winther

摘要:

在本文中,我们考虑稀疏和可识别的线性潜变量(因子)和线性贝叶斯网络模型的多元数据的简约分析。我们提出了一个计算效率的方法,联合参数和模型的推断,模型比较。它包括一个完整的贝叶斯层次结构的稀疏模型,使用板和穗先验(两个组件的δ函数和连续的混合物),非高斯潜在因素和随机搜索的变量的顺序。我们称之为SLIM(稀疏线性可识别多变量建模)的框架在人工和真实生物数据集上进行了验证和基准测试。SLIM在精神上最接近LiNGAM(Shimizu等人,2006),但在推理,贝叶斯网络结构学习和模型比较方面有很大不同。在实验上,SLIM的性能与LiNGAM相当或更好,计算复杂度相当。我们把这主要归因于所使用的随机搜索策略和简约性(稀疏性和可识别性),这是模型的一个明确部分。我们提出了两个扩展的基本独立同分布。线性框架:对观测变量的非线性依赖,称为SNIM(稀疏非线性可识别多变量建模),并允许时间和/或空间数据的潜在变量之间的相关性,称为CSLIM(相关SLIM)。源代码和脚本可从http://cogsys.imm.dtu.dk/slim/获得。

英文摘要:

In this paper we consider sparse and identifiable linear latent variable (factor) and linear Bayesian network models for parsimonious analysis of multivariate data. We propose a computationally efficient method for joint parameter and model inference, and model comparison. It consists of a fully Bayesian hierarchy for sparse models using slab and spike priors (two-component delta-function and continuous mixtures), non-Gaussian latent factors and a stochastic search over the ordering of the variables. The framework, which we call SLIM (Sparse Linear Identifiable Multivariate modeling), is validated and bench-marked on artificial and real biological data sets. SLIM is closest in spirit to LiNGAM (Shimizu et al., 2006), but differs substantially in inference, Bayesian network structure learning and model comparison. Experimentally, SLIM performs equally well or better than LiNGAM with comparable computational complexity. We attribute this mainly to the stochastic search strategy used, and to parsimony (sparsity and identifiability), which is an explicit part of the model. We propose two extensions to the basic i.i.d. linear framework: non-linear dependence on observed variables, called SNIM (Sparse Non-linear Identifiable Multivariate modeling) and allowing for correlations between latent variables, called CSLIM (Correlated SLIM), for the temporal and/or spatial data. The source code and scripts are available from http://cogsys.imm.dtu.dk/slim/.

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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