In a two-task linear regression model with random orthogonal tasks, sufficiently high overparameterization keeps the first task's risk low after training on the second task, and the forgetting ratio vanishes as the number of features grows.
Two models of double descent for weak features
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Analysis of Overparameterization in Continual Learning under a Linear Model
In a two-task linear regression model with random orthogonal tasks, sufficiently high overparameterization keeps the first task's risk low after training on the second task, and the forgetting ratio vanishes as the number of features grows.