Machine Unlearning for Grid SearchCV
Senthil Pandi S, Pramod Kumar, Nandha Kumar P, Karthick Rajendran · 2025
Machine unlearning has emerged as a critical ability to ensure data privacy, legal compliance, and model efficiency in machine learning systems. As machine learning applications continue to expand into sensitive domains such as healthcare, finance, and personalized services, the ability to selectively forget certain data points becomes increasingly vital. Ensuring compliance with regulations like the General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA) necessitates effective unlearning methods that do not compromise model integrity or computational efficiency. How- ever, traditional approaches to unlearning, which often rely on full retraining, can be prohibitively expensive and time- consuming. Grid search cross-validation (CV), a widely used technique for hyperparameter tuning, plays a fundamental role in optimizing machine learning models. However, it struggles to incorporate unlearning due to its extensive search process and dependence on the entire dataset. Each time a data point is re- moved, grid search typically requires complete retraining across multiple hyperparameter configurations, leading to excessive computational overhead.