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arXiv 2104.10099stat.ME
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偏相关图形LASSO

Partial Correlation Graphical LASSO

Jack Storror Carter, David Rossell, Jim Q. Smith

AI总结:

本文提出偏相关图形LASSO,一种尺度不变的惩罚方法,用于高斯图形模型推断,通过条件凸优化在偏相关上施加L1惩罚,提升推断效果。

摘要:

用于学习高斯图形模型的标准似然惩罚基于对精度矩阵的非对角元素进行正则化。此类方法及其贝叶斯对应方法,在变量进行标量乘法时并非不变,除非将观测数据标准化为单位样本方差。我们表明,这种标准化可能对推断产生强烈影响,并引入一类基于偏相关的新惩罚。我们证明后者以及最大似然、$L_0$和对数惩罚是尺度不变的。我们展示了其中一种惩罚——偏相关图形LASSO——的使用,它对偏相关施加$L_{1}$惩罚。相关的优化问题不再是凸的,但条件凸。我们通过模拟示例和两个真实数据集表明,除了尺度不变性外,在推断方面可能有重要改进。

英文摘要:

Standard likelihood penalties to learn Gaussian graphical models are based on regularising the off-diagonal entries of the precision matrix. Such methods, and their Bayesian counterparts, are not invariant to scalar multiplication of the variables, unless one standardises the observed data to unit sample variances. We show that such standardisation can have a strong effect on inference and introduce a new family of penalties based on partial correlations. We show that the latter, as well as the maximum likelihood, $L_0$ and logarithmic penalties are scale invariant. We illustrate the use of one such penalty, the partial correlation graphical LASSO, which sets an $L_{1}$ penalty on partial correlations. The associated optimization problem is no longer convex, but is conditionally convex. We show via simulated examples and in two real datasets that, besides being scale invariant, there can be important gains in terms of inference.

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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