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Towards Adversarial Evaluations for Inexact Machine Unlearning

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arxiv 2201.06640 v3 pith:UMEVFO3Z submitted 2022-01-17 cs.LG cs.CV

classification cs.LGcs.CV
keywords unlearningevaluationdatamethodsalgorithmsinexactmachineadversarial
verification ladder T0 review T1 audit T2 compute T3 formal
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Machine Learning models face increased concerns regarding the storage of personal user data and adverse impacts of corrupted data like backdoors or systematic bias. Machine Unlearning can address these by allowing post-hoc deletion of affected training data from a learned model. Achieving this task exactly is computationally expensive; consequently, recent works have proposed inexact unlearning algorithms to solve this approximately as well as evaluation methods to test the effectiveness of these algorithms. In this work, we first outline some necessary criteria for evaluation methods and show no existing evaluation satisfies them all. Then, we design a stronger black-box evaluation method called the Interclass Confusion (IC) test which adversarially manipulates data during training to detect the insufficiency of unlearning procedures. We also propose two analytically motivated baseline methods~(EU-k and CF-k) which outperform several popular inexact unlearning methods. Overall, we demonstrate how adversarial evaluation strategies can help in analyzing various unlearning phenomena which can guide the development of stronger unlearning algorithms.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The Space Complexity of Learning-Unlearning Algorithms

    cs.LG 2025-06 accept novelty 8.0 of 10

    The space complexity of machine unlearning for realizability testing is characterized by eluder dimension (central lower bound), star number (ticketed upper bound), and hollow star number (bounded deletions), separati...

  2. System-Aware Unlearning Algorithms: Use Lesser, Forget Faster

    cs.LG 2025-06 conditional novelty 7.0 of 10

    The paper introduces system-aware unlearning and gives the first exact unlearning algorithm for linear classification that stores a sublinear-size core set instead of the entire dataset.

  3. Leveraging Per-Instance Privacy for Machine Unlearning

    cs.LG 2025-05 conditional novelty 6.0 of 10

    Per-instance privacy losses, estimated from gradient norms during training, predict the number of fine-tuning steps needed for machine unlearning and rank data points by unlearning difficulty.

  4. Soft Weighted Machine Unlearning

    cs.LG 2025-05 conditional novelty 6.0 of 10

    Soft-weighted unlearning replaces binary data removal with per-sample weights from a convex quadratic program, improving fairness and robustness gains while preserving utility.

  5. Superior resilience to poisoning and amenability to unlearning in quantum machine learning

    quant-ph 2025-08 conditional novelty 5.0 of 10

    A simulator study reports that QNNs hold accuracy under label flipping better than a large MLP and unlearn faster, but the claimed fundamental advantage is not established without regularized classical baselines.

  6. Forget-MI: Machine Unlearning for Forgetting Multimodal Information in Healthcare Settings

    cs.LG 2025-06 conditional novelty 5.0 of 10

    Forget-MI unlearns unimodal and joint embeddings of patient data in a multimodal chest X-ray model, reducing membership inference attack success by 0.202 while preserving only part of the original test performance.

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