In scenarios with long-tailed distributions, the model's ability to identify
tail classes is limited due to the under-representation of tail samples. Class
rebalancing, information augmentation, and other techniques have been proposed
to facilitate models to learn the potential distribution of tail classes. The
disadvantage is that these methods generally pursue models with balanced class
accuracy on the data manifold, while ignoring the ability of the model to
resist interference. By constructing noisy data manifold, we found that the
robustness of models trained on unbalanced data has a long-tail phenomenon.
That is, even if the class accuracy is balanced on the data domain, it still
has bias on the noisy data manifold. However, existing methods cannot
effectively mitigate the above phenomenon, which makes the model vulnerable in
long-tailed scenarios. In this work, we propose an Orthogonal Uncertainty
Representation (OUR) of feature embedding and an end-to-end training strategy
to improve the long-tail phenomenon of model robustness. As a general
enhancement tool, OUR has excellent compatibility with other methods and does
not require additional data generation, ensuring fast and efficient training.
Comprehensive evaluations on long-tailed datasets show that our method
significantly improves the long-tail phenomenon of robustness, bringing
consistent performance gains to other long-tailed learning methods.

在长尾分布的情景中，模型对尾部类别的识别能力受限于尾部样本的少量表示。本文提出了一种基于特征嵌入的正交不确定性表示方法（OUR）和端到端的训练策略，以改善模型的长尾现象。研究结果在长尾数据集上进行的综合评估表明，OUR 方法显著改善了模型的长尾现象，为其他长尾学习方法带来了一致的性能提升。