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A 90% accurate classifier that finds none of the cases you care about

Here's a small evaluation exercise you can do without training a model. Imagine 100 examples: 90 negative and 10 positive. Your classifier predicts “negative” for every example. Result Count Correct negatives 90 Missed positives 10 Found positives 0 Its accuracy is 90/100 = 90% . Its recall for the…

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  1. 2026-10-17 07:17 · r/learnmachinelearning
    A 90% accurate classifier that finds none of the cases you care about

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