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arXiv 0910.5932cs.LGcs.CVcs.IR
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使用线性变换的度量和核学习

Metric and Kernel Learning using a Linear Transformation

Prateek Jain, Brian Kulis, Jason V. Davis, Inderjit S. Dhillon

摘要:

度量和核学习在若干机器学习应用中是重要的。然而,大多数现有的度量学习算法仅限于学习低维数据上的度量,而现有的核学习算法通常仅限于转换设置,并且不推广到新的数据点。在本文中,我们研究度量学习作为一个学习的输入数据的线性变换的问题。我们表明,对于高维数据,基于LogDet散度学习数据线性变换的特定框架可以有效地进行核化,以在任意高维空间上学习度量(或等效地,核函数)。我们进一步证明了一个广泛的一类凸损失函数学习线性变换可以类似地被核化,从而大大扩展了度量学习的潜在应用。我们证明了我们的学习方法,将其应用到大规模的现实世界中的问题,计算机视觉和文本挖掘。

英文摘要:

Metric and kernel learning are important in several machine learning applications. However, most existing metric learning algorithms are limited to learning metrics over low-dimensional data, while existing kernel learning algorithms are often limited to the transductive setting and do not generalize to new data points. In this paper, we study metric learning as a problem of learning a linear transformation of the input data. We show that for high-dimensional data, a particular framework for learning a linear transformation of the data based on the LogDet divergence can be efficiently kernelized to learn a metric (or equivalently, a kernel function) over an arbitrarily high dimensional space. We further demonstrate that a wide class of convex loss functions for learning linear transformations can similarly be kernelized, thereby considerably expanding the potential applications of metric learning. We demonstrate our learning approach by applying it to large-scale real world problems in computer vision and text mining.

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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