As learning from non-stationary streams of data has been proven a challenging endeavour, current continual learners often strongly relax the problem, assuming balanced datasets, unlimited processing of data stream subsets, and additional availability of task information, sometimes even during inference. In contrast, our continual learner processes the data streams in an online fashion, without additional task-information, and shows solid robustness to imbalanced data streams resembling a real-world setting. Defying such challenging settings is achieved by aggregating prototypes and nearest-neighbour based classification in a shared latent space, where a Continual Prototype Evolution (CoPE) enables learning and prediction at any point in time. As the embedding network continually changes, prototypes inevitably become obsolete, which we prevent by replay of exemplars from memory. We obtain state-of-the-art performance by a significant margin on five benchmarks, including two highly unbalanced data streams.

通过在共享的潜变量空间中不断更新原型解决了在线学习中原型过时和缓解遗忘的问题，提出了一种学习和预测任意时间点数据的系统。除了最近邻预测之外，通过提高类原型周围的聚类密度和增加类间方差来促进学习的同时，使用记忆库中的样本构成虚拟原型来提高潜在空间质量。

持续原型演变：从非稳态数据流中在线学习