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Question bank: 130 questions across six learning areas.
Used only in timed mode.
Incorrect answers deduct 0.25 points.
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- Select one answer, or several for multi-select questions.
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- Submit to view scores, charts, topic analysis, and explanations.
| MSE | MSE = (1/n) Σ(y - ŷ)² |
| MAE | MAE = (1/n) Σ|y - ŷ| |
| Binary cross-entropy | BCE = -[y ln(p) + (1-y) ln(1-p)] |
| Categorical cross-entropy | CE = -Σ yₖ ln(pₖ) |
| Huber, δ = 1 | 0.5r² when |r| ≤ 1; otherwise |r| - 0.5 |
| Weighted mean | Σ(wᵢLᵢ) / Σwᵢ |
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