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(Model, Sample) -> MembershipScore
Determine whether a private data record was used in a model's training set by training a shadow classification model to recognize differences in confidence vector distributions.
Problem it solves
Models memorize specific characteristics of training samples, risking user privacy leakages through black-box predictions.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.