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arXiv 1602.04398stat.MLcs.ITcs.LGmath.IT
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两个特征向量的联合近似约简

Joint Dimensionality Reduction for Two Feature Vectors

University of Illinois, Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校)

Yanjun Li, Yoram Bresler

摘要:

许多机器学习问题,尤其是多模态学习问题,具有两组不同的特征(例如,新闻故事分类中的图像和文本特征,或者认知科学研究中的神经成像数据和神经认知数据)。研究了有监督学习问题中两个特征向量的联合降维问题。特别地,我们假设一个判别模型,其中两个特征向量的低维线性嵌入是用于预测因变量的充分统计量。我们表明,一个简单的算法,涉及奇异值分解,可以准确地估计的嵌入,提供一定的样本复杂性得到满足,而不指定的非线性链接函数(回归或分类)。主要结果建立在多个设置下的样本复杂性。不同链接函数的样本复杂度仅因常数因子而不同。

英文摘要:

Many machine learning problems, especially multi-modal learning problems, have two sets of distinct features (e.g., image and text features in news story classification, or neuroimaging data and neurocognitive data in cognitive science research). This paper addresses the joint dimensionality reduction of two feature vectors in supervised learning problems. In particular, we assume a discriminative model where low-dimensional linear embeddings of the two feature vectors are sufficient statistics for predicting a dependent variable. We show that a simple algorithm involving singular value decomposition can accurately estimate the embeddings provided that certain sample complexities are satisfied, without specifying the nonlinear link function (regressor or classifier). The main results establish sample complexities under multiple settings. Sample complexities for different link functions only differ by constant factors.

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