Contrastive learning applied to self-supervised representation learning has
seen a resurgence in recent years, leading to state of the art performance in
the unsupervised training of deep image models. Modern batch contrastive
approaches subsume or significantly outperform traditional contrastive losses
such as triplet, max-margin and the N-pairs loss. In this work, we extend the
self-supervised batch contrastive approach to the fully-supervised setting,
allowing us to effectively leverage label information. Clusters of points
belonging to the same class are pulled together in embedding space, while
simultaneously pushing apart clusters of samples from different classes. We
analyze two possible versions of the supervised contrastive (SupCon) loss,
identifying the best-performing formulation of the loss. On ResNet-200, we
achieve top-1 accuracy of 81.4% on the ImageNet dataset, which is 0.8% above
the best number reported for this architecture. We show consistent
outperformance over cross-entropy on other datasets and two ResNet variants.
The loss shows benefits for robustness to natural corruptions and is more
stable to hyperparameter settings such as optimizers and data augmentations.
Our loss function is simple to implement, and reference TensorFlow code is
released at this https URL

本文介绍了一种基于对比学习的自我监督表征学习方法，并将其推广到全监督设置中。其中，相同类别的样本点在嵌入空间中被拉在一起，而来自不同类别的样本则被同时推开，以实现更好的分类性能。实现简单，最佳损失函数表现优于交叉熵。