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Caught a slide-level data leakage bug in my histopathology classifier... accuracy dropped from a fake 99% to an honest 97.3% (CTransPath + CRC-VAL-HE-7K)

This story is from 2026-09-07. It is preserved in the archive; the latest stories are on the live feed.

Built a 9-class colorectal histopathology classifier. Caught a patient-level data leakage bug that was inflating validation accuracy to 99%+, rebuilt the evaluation pipeline against an independent holdout patient cohort ( CRC-VAL-HE-7K ), and benchmarked a pathology-native transformer (CTransPath)…

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  1. 2026-09-07 20:49 · r/computervision
    Caught a slide-level data leakage bug in my histopathology classifier... accuracy dropped from a fake 99% to an honest 97.3% (CTransPath + CRC-VAL-HE-7K)

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