SOURCE-LINKED INTELLIGENCE

Source-Free Class Relearning: Diagnosing Forgetting in Class Unlearning

arXiv · AI, language, vision and robotics · article · Sep 2, 2026 · UTC

Class unlearning aims to remove a model's ability to recognize designated forget classes while preserving performance on retain classes. However, low forget accuracy after unlearning does not necessarily mean the class structure has been erased. Approximate unlearning methods can alter classifier decision boundaries while leaving recoverable structure in the representation. Prior work has shown that forget classes can be recovered, but existing approaches require real forget or retain samples, auxiliary data, or reference checkpoints. We study class relearning in a strictly source-free setting

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