arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.09246stat.MLcs.LG
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具有稀疏性的高效基于核的变量选择

Efficient kernel-based variable selection with sparsistency

Shanghai University of Finance and Economics(上海财经大学);City University of Hong Kong(香港城市大学);Nanjing Audit University(南京审计大学)

Xin He, Junhui Wang, Shaogao Lv

摘要:

变量选择是高维数据分析的核心,已经开发了各种算法。理想情况下,变量选择算法应该是灵活的,可扩展的,并有理论上的保证,但大多数现有的算法不能同时达到这些属性。在这篇文章中,一个三步变量选择算法,涉及基于核的估计的回归函数及其梯度函数,以及硬阈值。它的主要优点是,它假设没有明确的模型假设,承认一般的预测效果,允许可扩展的计算,并达到理想的渐近稀疏性。该算法适用于任何具有不同核函数的再生核希尔伯特空间,并可稍加修改扩展到交互选择。它的计算成本在数据维上仅是线性的,并且可以通过并行计算进一步提高。该算法的稀疏性建立在一般RKHS在温和的条件下,包括线性和高斯核作为特殊情况。它的有效性也支持各种模拟和真实的例子。

英文摘要:

Variable selection is central to high-dimensional data analysis, and various algorithms have been developed. Ideally, a variable selection algorithm shall be flexible, scalable, and with theoretical guarantee, yet most existing algorithms cannot attain these properties at the same time. In this article, a three-step variable selection algorithm is developed, involving kernel-based estimation of the regression function and its gradient functions as well as a hard thresholding. Its key advantage is that it assumes no explicit model assumption, admits general predictor effects, allows for scalable computation, and attains desirable asymptotic sparsistency. The proposed algorithm can be adapted to any reproducing kernel Hilbert space (RKHS) with different kernel functions, and can be extended to interaction selection with slight modification. Its computational cost is only linear in the data dimension, and can be further improved through parallel computing. The sparsistency of the proposed algorithm is established for general RKHS under mild conditions, including linear and Gaussian kernels as special cases. Its effectiveness is also supported by a variety of simulated and real examples.

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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