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Activity Regularization for Continual Learning

While deep neural networks have achieved remarkable successes, they suffer the well-known catastrophic forgetting issue when switching from existing tasks to tackle a new one. In this paper, we study continual learning with deep neural networks that learn from tasks arriving sequentially. We first propose an approximated multi-task learning framework that unifies a family of popular regularization based continual learning methods. We then analyze the weakness of existing approaches, and propose a novel regularization method named “Activity Regularization” (AR), which alleviates forgetting meanwhile keeping model’s plasticity to acquire new knowledge. Extensive experiments show that our method outperform state-of-the-art methods and effectively overcomes catastrophic forgetting.

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