arXiv AI By Liying Wang, Simone Magistri, Joost van de Weijer

Beyond Parameter Protection: Fisher-Shaped EWC for Replay-Free Continual Learning

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The paper introduces Fisher-Shaped EWC (FS‑EWC), a replay‑free continual learning method that extends Elastic Weight Consolidation by controlling Fisher sensitivity over a neighborhood of future updates. FS‑EWC minimizes the worst‑case empirical Fisher information trace during task learning, favoring solutions robust to bounded parameter displacement, and uses trajectory‑based model merging to construct the retained solution from multiple optimization states. Experiments on several benchmarks demonstrate that FS‑EWC outperforms standard EWC, achieving a better stability–plasticity balance and higher tolerance to parameter drift.

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