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arXiv 2303.14801stat.MEstat.COstat.ML
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FAStEN:高维函数回归中特征选择与估计的高效自适应方法

FAStEN: An Efficient Adaptive Method for Feature Selection and Estimation in High-Dimensional Functional Regressions

Tobia Boschi, Lorenzo Testa, Francesca Chiaromonte, Matthew Reimherr

AI总结:

本文提出FAStEN方法,结合函数数据、优化与机器学习技术,在稀疏高维函数回归中同时进行特征选择与参数估计,显著降低计算成本并提升选择性能,且不牺牲系数估计质量。

摘要:

函数回归分析是许多现代科学应用的成熟工具。涉及大型复杂数据集的回归问题无处不在,而特征选择对于避免过拟合和实现准确预测至关重要。我们提出了一种新颖、灵活且超高效的方法,用于在稀疏高维函数对函数回归问题中进行特征选择,并展示了如何将其扩展到标量对函数框架。我们的方法名为FAStEN,结合了函数数据、优化和机器学习技术,以同时执行特征选择和参数估计。我们利用函数主成分的性质和Dual Augmented Lagrangian问题固有的稀疏性来显著降低计算成本,并引入了一种自适应方案以提高选择准确性。此外,我们推导了渐近oracle性质,保证了所提出的FAStEN估计量的估计和选择一致性。通过广泛的模拟研究,我们将我们的方法与现有的最佳竞争方法进行了基准比较,并展示了在CPU时间和选择性能方面的巨大提升,同时没有牺牲系数估计的质量。理论推导和模拟研究为我们的方法提供了强有力的动机。最后,我们展示了在AOMIC PIOP1研究的大脑fMRI数据上的应用。完整的FAStEN代码可在https://github.com/IBM/funGCN获取。

英文摘要:

Functional regression analysis is an established tool for many contemporary scientific applications. Regression problems involving large and complex data sets are ubiquitous, and feature selection is crucial for avoiding overfitting and achieving accurate predictions. We propose a new, flexible and ultra-efficient approach to perform feature selection in a sparse high dimensional function-on-function regression problem, and we show how to extend it to the scalar-on-function framework. Our method, called FAStEN, combines functional data, optimization, and machine learning techniques to perform feature selection and parameter estimation simultaneously. We exploit the properties of Functional Principal Components and the sparsity inherent to the Dual Augmented Lagrangian problem to significantly reduce computational cost, and we introduce an adaptive scheme to improve selection accuracy. In addition, we derive asymptotic oracle properties, which guarantee estimation and selection consistency for the proposed FAStEN estimator. Through an extensive simulation study, we benchmark our approach to the best existing competitors and demonstrate a massive gain in terms of CPU time and selection performance, without sacrificing the quality of the coefficients' estimation. The theoretical derivations and the simulation study provide a strong motivation for our approach. Finally, we present an application to brain fMRI data from the AOMIC PIOP1 study. Complete FAStEN code is provided at https://github.com/IBM/funGCN.

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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