Real-world scenarios are usually accompanied by continuously appearing classes with scare labeled samples, which require the machine learning model to incrementally learn new classes and maintain the knowledge of base classes. In this Few-Shot Class-Incremental Learning (FSCIL) scenario, existing methods either introduce extra learnable components or rely on a frozen feature extractor to mitigate catastrophic forgetting and overfitting problems. However, we find a tendency for existing methods to misclassify the samples of new classes into base classes, which leads to the poor performance of new classes. In other words, the strong discriminability of base classes distracts the classification of new classes. To figure out this intriguing phenomenon, we observe that although the feature extractor is only trained on base classes, it can surprisingly represent the semantic similarity between the base and unseen new classes. Building upon these analyses, we propose a simple yet effective Training-frEE calibratioN (TEEN) strategy to enhance the discriminability of new classes by fusing the new prototypes (i.e., mean features of a class) with weighted base prototypes. In addition to standard benchmarks in FSCIL, TEEN demonstrates remarkable performance and consistent improvements over baseline methods in the few-shot learning scenario. Code is available at: https://github.com/wangkiw/TEEN

在Few-Shot Class-Incremental Learning (FSCIL)场景中，我们发现现有方法倾向于将新类别的样本错误地分类为基类别，导致新类别的性能表现较差。为了解决这一问题，我们提出了一种简单而有效的训练无关的校准策略（TEEN），通过将新类别的原型与加权基类别的原型相融合，以增强新类别的可区分性。在FSCIL标准基准测试中，TEEN显示出出色的性能并在few-shot learning场景中持续改进。

无需训练的原型校准的少样本类增量学习