Data in prompts + memory
Delete conversation logs + memory + embeddings. Straightforward.
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Data in training
Retrain to exclude. Prohibitively expensive. Machine unlearning research. Regulators accepting best-effort.
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Guidance
UK ICO: model output about individual should not be inaccurate. Not requiring perfect training data erasure.
Practice
Delete usage data (logs, embeddings, memory). Filter outputs mentioning individual. Document limitations.