Brent Mittelstadt

Counterfactual explanation

in Black box

Brent Mittelstadt, data ethicist at the Oxford Internet Institute (and, at the time, University College London's Science and Technology Studies department). A co-author of Counterfactual Explanations Without Opening the Black Box and of the companion GDPR right-to-explanation paper; his work centres on AI ethics, data protection, and the ethics of algorithms.

Stake§

Academic and reform-oriented, with public research funding; no commercial conflict.

Mittelstadt is a co-author of the counterfactual- explanation paper, which for this topic reframes a right to understand an automated decision as a right to know what to change. His broader survey work on the ethics of algorithms maps the normative side of algorithmic opacity that Pasquale argues from the law-and-power direction.

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excerpts

explanations can, in principle, be offered without opening the 'black box.' Looking at explanations as a means to help a data subject act rather than merely understand, one could gauge the scope and content of explanations according to the specific goal or action they are intended to support.
— Counterfactual Explanations Without Opening the Black Box: Automated Decisions and the GDPR (2018)

The legal move that matches the technical one: drop the demand to see inside the model, and ask instead what the person needs in order to act. An [[concept:explainability|explanation]] is judged by the recourse it enables, not by the mechanism it reveals.

on Counterfactual explanation, Explainability

You were denied a loan because your annual income was £30,000. If your income had been £45,000, you would have been offered a loan.
— Counterfactual Explanations Without Opening the Black Box: Automated Decisions and the GDPR (2018)

A [[concept:counterfactual-explanation|counterfactual explanation]] in one line: the smallest change to the inputs that would have flipped the decision. It tells the subject what to change without disclosing — or even requiring — the model's internals.

on Counterfactual explanation