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99% accuracy, completely worthless: ML on rare events

This story is from 2026-08-23. It is preserved in the archive; the latest stories are on the live feed.

Here's a model that predicts rockfalls with 99% accuracy. It's also completely worthless. If a dangerous slope fails, say, one day in a hundred, a model that shrugs and says "no rockfall" every single day is right 99% of the time — and will get people killed. That paradox is the first thing you con…

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  1. 2026-08-23 07:22 · DEV Community — Machine Learning
    99% accuracy, completely worthless: ML on rare events

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