The standard regression loss. Penalizes large errors more than MAE.
MSE = (1/n) × Σ (y_true[i] - y_pred[i])²mse([1,2,3], [1,2,4]) → 0.33333
Round to **5 decimal places**.
Similar Problems
Test Cases (2 visible · 2 hidden)
Case 1: One wrong prediction
Input: mse([1,2,3],[1,2,4])
Expected: 0.33333
Case 2: Perfect predictions
Input: mse([1,2,3],[1,2,3])
Expected: 0.0
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