论文标题

自适应原型网络

Adaptive Prototypical Networks

论文作者

Gogoi, Manas, Tiwari, Sambhavi, Verma, Shekhar

论文摘要

少数镜头学习的原型网络试图在编码器中学习一个嵌入功能,该函数嵌入具有相似特征的图像在嵌入空间中彼此接近。但是,在此过程中,任务的支持集样本是独立于另一个任务的嵌入,因此,不考虑类间的亲密关系。因此,在任务中存在相似的类别的情况下,嵌入在嵌入空间中往往彼此接近,甚至可能在某些区域重叠,这对于分类不可能。在本文中,我们提出了一种方法,该方法在元测试阶段将每个类别的嵌入远离其他类别的嵌入方式,从而根据不同的类标签对它们进行仔细分组,而不仅仅是空间特征的相似性。这是通过使用新任务的支持集样本和标签训练编码网络来实现的。与原型网络以及其他标准的几次学习模型相比,在基准数据集上进行的广泛实验表明,元测试准确性的提高。

Prototypical network for Few shot learning tries to learn an embedding function in the encoder that embeds images with similar features close to one another in the embedding space. However, in this process, the support set samples for a task are embedded independently of one other, and hence, the inter-class closeness is not taken into account. Thus, in the presence of similar-looking classes in a task, the embeddings will tend to be close to each other in the embedding space and even possibly overlap in some regions, which is not desirable for classification. In this paper, we propose an approach that intuitively pushes the embeddings of each of the classes away from the others in the meta-testing phase, thereby grouping them closely based on the distinct class labels rather than only the similarity of spatial features. This is achieved by training the encoder network for classification using the support set samples and labels of the new task. Extensive experiments conducted on benchmark data sets show improvements in meta-testing accuracy when compared with Prototypical Networks and also other standard few-shot learning models.

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