arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.08626cs.CV
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领域自适应少样本学习

Domain-Adaptive Few-Shot Learning

Renmin University of China(中国人民大学);The University of Hong Kong(香港大学);University of Surrey(萨里大学)

An Zhao, Mingyu Ding, Zhiwu Lu, Tao Xiang, Yulei Niu, Jiechao Guan, Ji-Rong Wen, Ping Luo

摘要:

现有的少样本学习(FSL)方法隐含地假设少量目标类样本来自与源类样本相同的域。然而,在实践中,这种假设通常是无效的--目标类可能来自不同的域。这对具有很少训练样本的领域自适应(DA)提出了额外的挑战。本文研究了领域自适应少样本学习(DA-FSL)问题,要求在统一的框架下求解FSL和DA。为此,我们提出了一种新的领域对抗原型网络(DAPN)模型。它旨在解决DA-FSL中的特定挑战:DA目标意味着源和目标数据分布需要对齐,通常通过共享的域自适应特征嵌入空间;但FSL目标规定每个类的目标域分布必须与任何源域类的分布不同,这意味着跨域对齐分布可能会损害FSL性能。如何在保持源/目标每类区分度的同时实现全局域分布对齐成为关键。我们的解决方案是在DAPN中的域自适应特征嵌入学习之前显式地增强源/目标每类分离,以减轻域对齐对FSL的负面影响。大量的实验表明,我们的DAPN优于最先进的FSL和DA模型,以及他们的天真的组合。该代码可在https://github.com/dingmyu/DAPN上获得。

英文摘要:

Existing few-shot learning (FSL) methods make the implicit assumption that the few target class samples are from the same domain as the source class samples. However, in practice this assumption is often invalid -- the target classes could come from a different domain. This poses an additional challenge of domain adaptation (DA) with few training samples. In this paper, the problem of domain-adaptive few-shot learning (DA-FSL) is tackled, which requires solving FSL and DA in a unified framework. To this end, we propose a novel domain-adversarial prototypical network (DAPN) model. It is designed to address a specific challenge in DA-FSL: the DA objective means that the source and target data distributions need to be aligned, typically through a shared domain-adaptive feature embedding space; but the FSL objective dictates that the target domain per class distribution must be different from that of any source domain class, meaning aligning the distributions across domains may harm the FSL performance. How to achieve global domain distribution alignment whilst maintaining source/target per-class discriminativeness thus becomes the key. Our solution is to explicitly enhance the source/target per-class separation before domain-adaptive feature embedding learning in the DAPN, in order to alleviate the negative effect of domain alignment on FSL. Extensive experiments show that our DAPN outperforms the state-of-the-art FSL and DA models, as well as their naïve combinations. The code is available at https://github.com/dingmyu/DAPN.

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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