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Multi-task Learning in vector-valued reproducing kernel Banach spaces with the l~1 norm

机译:矢量值的多任务学习,再现核心Banach空间,L〜1规范

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摘要

Targeting at sparse multi-task learning, we consider regularization models with an l(1) penalty on the coefficients of kernel functions. In order to provide a kernel method for this model, we construct a class of vector-valued reproducing kernel Banach spaces with the l(1) norm. The notion of multi-task admissible kernels is proposed so that the constructed spaces could have desirable properties including the crucial linear representer theorem. Such kernels are related to bounded Lebesgue constants of a kernel interpolation question. We study the Lebesgue constant of multi-task kernels and provide examples of admissible kernels. Furthermore, we present numerical experiments for both synthetic data and real-world benchmark data to demonstrate the advantages of the proposed construction and regularization models. (C) 2020 Elsevier Inc. All rights reserved.
机译:针对稀疏的多任务学习,我们考虑正则化模型在内核函数的系数上具有L(1)惩罚。为了提供该模型的内核方法,我们构建了一类用L(1)规范的矢量值再现核空间。提出了多任务可允许核的概念,使得构造的空间可以具有所需的性质,包括该关键线性代表定理。这种内核与内核插值问题的有界lebesgue常数有关。我们研究了多任务内核的Lebesgue常数,并提供可允许内核的例子。此外,我们为合成数据和现实世界的基准数据提供了数值实验,以展示所提出的建筑和正则化模型的优势。 (c)2020 Elsevier Inc.保留所有权利。

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