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关注这篇论文的作者
Shulei Wang

数据增强不变的流形学习

研究问题
在一般非线性环境中,数据增强如何改变学习到的表示,并在什么框架下解释其对下游近邻分类的改善?
方法与思路
作者用低维乘积流形建模数据增强变换,结合流形几何与增强不变性构造表示学习方法,并转化为随机优化问题求解。
材料陈述的贡献
摘要称,该方法具有明确理论保证;理论解释增强为何改善近邻分类,并在所设框架下揭示更复杂增强带来更多改善的关系。
阅读关注点
应核对乘积流形假设、增强复杂度的定义、分类改善的衡量方式及理论条件,并审查算法效率与数值比较的设定。
阅读边界
仅据所给 Crossref 摘要;未提供理论条件、改善幅度或复杂度定义,不能将增强越复杂越好的陈述推广到任意任务和数据。

原文摘要

Abstract Data augmentation is a widely used technique and an essential ingredient in the recent advance in self-supervised representation learning. By preserving the similarity between augmented data, the resulting data representation can improve various downstream analyses and achieve state-of-the-art performance in many applications. Despite the empirical effectiveness, most existing methods lack theoretical understanding under a general nonlinear setting. To fill this gap, we develop a statistical framework on a low-dimensional product manifold to model the data augmentation transformation. Under this framework, we introduce a new representation learning method called augmentation invariant manifold learning and design a computationally efficient algorithm by reformulating it as a stochastic optimization problem. Compared with existing self-supervised methods, the new method simultaneously exploits the manifold’s geometric structure and invariant property of augmented data and has an explicit theoretical guarantee. Our theoretical investigation characterizes the role of data augmentation in the proposed method and reveals why and how the data representation learned from augmented data can improve the k-nearest neighbour classifier in the downstream analysis, showing that a more complex data augmentation leads to more improvement in downstream analysis. Finally, numerical experiments on simulated and real data sets are presented to demonstrate the merit of the proposed method.

笔记与分组
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