18. L2 Regularization

Easy

Implement the L2 regularization penalty term.

Signature: def l2_reg(w: np.ndarray, lam: float) -> float

Return lam * sum(w^2).

Math

L_{L 2} = λ i \sum w_{i}^{2}

Asked at

Python 30/10 runs today

Output

Anything you print() in your code will show up here after you click Run.

Test Results

○basic

○zero weights

○large lambda🔒 Premium

○L2 penalty is non-negative

○L2 penalty is non-negative (negative weights only)

○L2 invariant to sign of weights