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What is machine unlearning, and how do you make a model 'forget' specific data?

GDPR erasure and copyright takedowns demand removing a user's influence from trained weights, not just a dataset row. The signal is knowing why deletion isn't enough and where retrain, SISA, and approximate scrubbing each land on the cost-versus-proof curve.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

GDPR erasure and copyright takedowns demand removing a user's influence from trained weights, not just a dataset row. The signal is knowing why deletion isn't enough and where retrain, SISA, and approximate scrubbing each land on the cost-versus-proof curve.

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