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arXiv 1306.3905cs.LGstat.ML
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多任务核回归算法的稳定性

Stability of Multi-Task Kernel Regression Algorithms

Aix-Marseille University(艾克斯-马赛大学);CNRS(法国国家科学研究中心)

Julien Audiffren, Hachem Kadri

摘要:

在具有算子核的再生Hilbert空间中研究了非线性多任务回归的稳定性。这样的内核,也称为多任务内核适用于具有非标量输出的学习问题,如多任务学习和结构化输出预测。我们证明了多任务核回归算法在无限维输出空间的一般情况下是一致稳定的。然后,我们推导出在温和的假设下的核广义界的算法,我们证明了它们的一致性,甚至与非Hilbert-Schmidt算子值的内核。我们演示了如何将结果应用于各种多任务核回归方法,如向量值SVR和函数岭回归。

英文摘要:

We study the stability properties of nonlinear multi-task regression in reproducing Hilbert spaces with operator-valued kernels. Such kernels, a.k.a. multi-task kernels, are appropriate for learning prob- lems with nonscalar outputs like multi-task learning and structured out- put prediction. We show that multi-task kernel regression algorithms are uniformly stable in the general case of infinite-dimensional output spaces. We then derive under mild assumption on the kernel generaliza- tion bounds of such algorithms, and we show their consistency even with non Hilbert-Schmidt operator-valued kernels . We demonstrate how to apply the results to various multi-task kernel regression methods such as vector-valued SVR and functional ridge regression.

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