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arXiv 1711.08054cs.LGstat.ML
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生成式对抗积极非标记学习

Generative Adversarial Positive-Unlabelled Learning

RIKEN(理化学研究所);Laval University(拉瓦尔大学)

Ming Hou, Brahim Chaib-draa, Chao Li, Qibin Zhao

摘要:

在这项工作中,我们考虑分类二进制正未标记(PU)数据的任务。现有的基于判别学习的PU模型试图为U数据寻求最优的重新加权策略,从而找到合适的决策边界,然而,在有限的P数据下,传统的PU模型在适应非常灵活的深度神经网络时容易出现过拟合。相比之下,我们是第一个通过利用强大的生成对抗网络(GAN)从生成学习的角度创新一种全新的范式来攻击二进制PU任务的人。我们的生成正未标记(GenPU)框架包含一系列鉴别器和生成器,它们在同时产生正和负真实样本时具有不同的作用。我们提供了理论分析来证明,在平衡,GenPU是能够恢复正负数据分布。此外,我们还表明GenPU具有可推广性,并且与半监督分类密切相关。鉴于相当有限的P数据,合成和真实世界的数据集上的实验证明了我们提出的框架的有效性。通过GenPU生成的无限逼真和多样化的样本流,可以使用深度神经网络训练非常灵活的分类器。

英文摘要:

In this work, we consider the task of classifying binary positive-unlabeled (PU) data. The existing discriminative learning based PU models attempt to seek an optimal reweighting strategy for U data, so that a decent decision boundary can be found. However, given limited P data, the conventional PU models tend to suffer from overfitting when adapted to very flexible deep neural networks. In contrast, we are the first to innovate a totally new paradigm to attack the binary PU task, from perspective of generative learning by leveraging the powerful generative adversarial networks (GAN). Our generative positive-unlabeled (GenPU) framework incorporates an array of discriminators and generators that are endowed with different roles in simultaneously producing positive and negative realistic samples. We provide theoretical analysis to justify that, at equilibrium, GenPU is capable of recovering both positive and negative data distributions. Moreover, we show GenPU is generalizable and closely related to the semi-supervised classification. Given rather limited P data, experiments on both synthetic and real-world dataset demonstrate the effectiveness of our proposed framework. With infinite realistic and diverse sample streams generated from GenPU, a very flexible classifier can then be trained using deep neural networks.

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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