Recently, continual learning (CL) has gained significant interest because it
enables deep learning models to acquire new knowledge without forgetting
previously learnt information. However, most existing works require knowing the
task identities and boundaries, which is not realistic in a real context. In
this paper, we address a more challenging and realistic setting in CL, namely
the Task-Free Continual Learning (TFCL) in which a model is trained on
non-stationary data streams with no explicit task information. To address TFCL,
we introduce an evolved mixture model whose network architecture is dynamically
expanded to adapt to the data distribution shift. We implement this expansion
mechanism by evaluating the probability distance between the knowledge stored
in each mixture model component and the current memory buffer using the Hilbert
Schmidt Independence Criterion (HSIC). We further introduce two simple dropout
mechanisms to selectively remove stored examples in order to avoid memory
overload while preserving memory diversity. Empirical results demonstrate that
the proposed approach achieves excellent performance.

本文提出了一种解决深度学习模型在没有显式任务信息的非定常数据流上进行持续学习的方法，即基于进化的混合模型，该模型的网络架构动态扩展以适应数据分布的变化，并引入了两个简单的丢弃机制来避免存储的例子过多导致记忆过载问题，实证结果表明，该方法在持续学习任务上取得了优异的性能。