论文标题
使用极性gan消除类不平衡:一种不确定性抽样方法
Removing Class Imbalance using Polarity-GAN: An Uncertainty Sampling Approach
论文作者
论文摘要
在深度学习模型以及传统模型的实践分类问题中,阶级失衡是一个具有挑战性的问题。传统上,诸如合成过度采样之类的成功对策在通过深度学习模型处理的复杂的结构化数据中取得了有限的成功。在这项工作中,我们建议使用配备了发电机网络G,Incistiminator网络D和分类器网络C的生成对抗网络(GAN)来删除视觉数据集中的类别不平衡。发电机网络使用自动编码器初始化,以使其稳定。歧视者D确保G遵守不平衡班级的班级分布。在传统的方法中,在最小游戏中,发电机G与鉴别器D竞争时,我们建议进一步在原始网络中添加附加的分类器网络。现在,发电机网络试图与歧视器以及我们引入的新分类器一起竞争Min-Max游戏。在发电机网络G上执行了一个附加条件,以在所需的不平衡类的凸壳中产生点。进一步提出了与分类器C的对抗游戏的争论,将G学到的有条件分布推向各个阶级的外围,以补偿阶级不平衡问题。实验证据表明,这种初始化会导致网络稳定训练。我们在FashionMnist,MNIST,SVHN,EXDARK,MVTEC异常检测数据集,Chest X射线数据集等方面实现了极端视觉分类任务的最新表现。
Class imbalance is a challenging issue in practical classification problems for deep learning models as well as for traditional models. Traditionally successful countermeasures such as synthetic over-sampling have had limited success with complex, structured data handled by deep learning models. In this work, we propose to use a Generative Adversarial Network (GAN) equipped with a generator network G, a discriminator network D and a classifier network C to remove the class-imbalance in visual data sets. The generator network is initialized with auto-encoder to make it stable. The discriminator D ensures that G adheres to class distribution of imbalanced class. In conventional methods, where Generator G competes with discriminator D in a min-max game, we propose to further add an additional classifier network to the original network. Now, the generator network tries to compete in a min-max game with Discriminator as well as the new classifier that we have introduced. An additional condition is enforced on generator network G to produce points in the convex hull of desired imbalanced class. Further the contention of adversarial game with classifier C, pushes conditional distribution learned by G towards the periphery of the respective class, compensating the problem of class imbalance. Experimental evidence shows that this initialization results in stable training of the network. We achieve state of the art performance on extreme visual classification task on the FashionMNIST, MNIST, SVHN, ExDark, MVTec Anomaly Detection dataset, Chest X-Ray dataset and others.