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Negative Log-Likelihood

Essential AI Math Excel Blueprints

Prof. Tom Yeh's avatar
Prof. Tom Yeh
Jan 30, 2026
∙ Paid

\(\mathrm{NLL} = - \log p(y \mid x) \)

Negative log likelihood measures how likely the model says the true outcome is. The likelihood is the probability the model assigns to the correct answer.

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