United Kingdom
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99.98% looks good to a layman, but that number is meaningless in reality.
Is that 0.02% error false positives or false negatives, or both?
Also, 0.02% means 2 in every 10,000. I don't think it takes long for 10,000 people to go through the doors of Sainsburys every day, considering the UK population is about 65 million and they're a nationwide company. Once this is rolled out nationwide they're going to have constant false flags.
Scumbag oppressive tactics by a scumbag company.
Yeah, 0.02% of 65 Million is 1.3 Million possible errors.
And that's just based on the raw population, that accuracy rating could be based on raw number of scans instead. A quick search shows Sainsbury's serves 16 million customers a week. That's 320,000 errors every week if the error rate is just raw scans as opposed to unique scans.
And the dataset is prbably racist, although in the reported case, it sounds like good old unreliable cross-race recognition by humans, with the evil eye pinging because it spotted someone and the store staff then telling the wrong person to naff off. It seems like a process or training failure if they don't ask the evil eye to confirm they've got the person it flagged before upsetting them.