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arXiv 2001.02865cs.CV
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基于条件旋转角估计的半监督学习

Semi-supervised Learning via Conditional Rotation Angle Estimation

The University of Adelaide(阿德莱德大学)

Hai-Ming Xu, Lingqiao Liu, Dong Gong

摘要:

自监督学习(Self-supervised learning,SlfSL)旨在通过巧妙设计的借口任务来学习特征表示而无需人工注释,在过去几年中取得了令人瞩目的进展。最近,SlfSL也被确定为半监督学习(SemSL)的一个有前途的解决方案,因为它提供了一个新的范例,利用未标记的数据。这项工作进一步探讨了这一方向,提出了耦合SlfSL与SemSL。我们的见解是,SemSL中的预测目标可以建模为SlfSL目标预测因子中的潜在因素。边缘化的潜在因素自然会产生一个新的公式,它结合了这两个学习过程的预测目标。通过一种简单但有效的SlfSL方法--旋转角度预测来实现这一想法,我们创建了一种新的SemSL方法,称为条件旋转角度估计(CRAE)。具体地,CRAE的特征在于采用了以候选图像类为条件的预测图像旋转角度的模块。通过实验评估,我们表明,CRAE实现了优越的性能比其他现有的方法相结合的SlfSL和SemSL。为了进一步提高CRAE,我们提出了两个扩展来加强基本CRAE中SemSL目标和SlfSL目标之间的耦合。我们表明,这导致一个改进的CRAE方法,可以实现最先进的SemSL性能。

英文摘要:

Self-supervised learning (SlfSL), aiming at learning feature representations through ingeniously designed pretext tasks without human annotation, has achieved compelling progress in the past few years. Very recently, SlfSL has also been identified as a promising solution for semi-supervised learning (SemSL) since it offers a new paradigm to utilize unlabeled data. This work further explores this direction by proposing to couple SlfSL with SemSL. Our insight is that the prediction target in SemSL can be modeled as the latent factor in the predictor for the SlfSL target. Marginalizing over the latent factor naturally derives a new formulation which marries the prediction targets of these two learning processes. By implementing this idea through a simple-but-effective SlfSL approach -- rotation angle prediction, we create a new SemSL approach called Conditional Rotation Angle Estimation (CRAE). Specifically, CRAE is featured by adopting a module which predicts the image rotation angle conditioned on the candidate image class. Through experimental evaluation, we show that CRAE achieves superior performance over the other existing ways of combining SlfSL and SemSL. To further boost CRAE, we propose two extensions to strengthen the coupling between SemSL target and SlfSL target in basic CRAE. We show that this leads to an improved CRAE method which can achieve the state-of-the-art SemSL performance.

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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