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arXiv 1206.6486cs.LGstat.ML
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多任务学习中潜在任务结构的柔性建模

Flexible Modeling of Latent Task Structures in Multitask Learning

University of Massachusetts(马萨诸塞大学);University of Utah(犹他大学);University of Campinas(坎皮纳斯大学);University of Maryland(马里兰大学)

Alexandre Passos, Piyush Rai, Jacques Wainer, Hal Daume

摘要:

多任务学习算法的设计通常假设所有任务共享的一些固定的、先验已知的潜在结构。然而,它通常是不清楚什么类型的潜在任务结构是最适合于一个给定的多任务学习问题。理想情况下,“正确的”潜在任务结构应该以数据驱动的方式学习。我们提出了一个灵活的,非参数贝叶斯模型,假定一个混合的因素分析结构的任务。该模型的非参数特性使得它可以取代现有的许多潜在任务结构模型(如均值正则化任务、聚类任务、低秩或线性/非线性子空间任务假设等)。此外,它还可以学习更一般的任务结构,解决这些模型的缺点。我们提出了一个变分推理算法,我们的模型。在人工数据集和真实数据集上的实验结果表明了该方法的有效性。

英文摘要:

Multitask learning algorithms are typically designed assuming some fixed, a priori known latent structure shared by all the tasks. However, it is usually unclear what type of latent task structure is the most appropriate for a given multitask learning problem. Ideally, the "right" latent task structure should be learned in a data-driven manner. We present a flexible, nonparametric Bayesian model that posits a mixture of factor analyzers structure on the tasks. The nonparametric aspect makes the model expressive enough to subsume many existing models of latent task structures (e.g, mean-regularized tasks, clustered tasks, low-rank or linear/non-linear subspace assumption on tasks, etc.). Moreover, it can also learn more general task structures, addressing the shortcomings of such models. We present a variational inference algorithm for our model. Experimental results on synthetic and real-world datasets, on both regression and classification problems, demonstrate the effectiveness of the proposed method.

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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