Title: Continual Learning via Continual Weighted Sparsity and Meta-Plasticity Scheduling
Primary area: transfer learning, meta learning, and lifelong learning
Keywords: Continual learning

Abstract: Continual Learning (CL) is fundamentally challenged by the stability-plasticity dilemma: the trade-off between acquiring new information and maintaining past knowledge. To address the stability, many methods keep a replay buffer containing a small set of samples from prior tasks and employ parameter isolation strategies that allocate separate parameter subspaces for each task, reducing interference between tasks. To get more refined, task-specific groups, we adapt a dynamic sparse training technique and introduce a continual weight score function to guide the iterative pruning process over multiple rounds of training. We refer to this method as the continual weighted sparsity scheduler. Furthermore, with more incremental tasks introduced, the network inevitably becomes saturated, leading to a loss of plasticity, where the model's adaptability decreases due to dormant or saturated neurons. To mitigate this, we draw inspiration from biological meta-plasticity mechanisms, and develop a meta-plasticity scheduler to dynamically adjust these task-specific groups' learning rates based on the sensitive score function we designed, ensuring a balance between retaining old knowledge and acquiring new skills. The results of comparison on popular datasets demonstrate that our approach consistently outperforms existing state-of-the-art methods, confirming its effectiveness in managing the stability-plasticity trade-off.