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2497Why Ridge Shrinks but Rarely Zeros 2Why does ridge typically shrink coefficients continuously toward zero rather than setting many of them exactly to zero?机器学习简单essay未尝试免费2498Lasso Zero Threshold in an Orthogonal Coordinate 3In an orthogonal one-feature problem with x T x = d and score z = x T y, for what lambdas does the lasso coefficient become exactly zero?机器学习中等derivation未尝试免费2499Soft-Thresholded Lasso Coefficient 4In an orthogonal one-feature problem with x T x = d and x T y = z > 0, derive the lasso coefficient when 0 < lambda < z.机器学习中等derivation未尝试面试订阅2500Equivalent Lambda for a Target Ridge Shrinkage Ratio 5In an orthogonal coordinate, ridge shrinks beta ols by the factor d/(d+lambda). What lambda yields a shrinkage ratio r in (0,1)?机器学习困难derivation未尝试面试订阅2501Equivalent L2 Radius From a Ridge Solution 6If the ridge optimum in R p is beta hat lambda, what radius t makes it also solve the constrained problem min RSS(beta) subject to ||beta|| 2 <= t?机器学习中等derivation未尝试免费2502Elastic-Net Coordinate Update in an Orthogonal Basis 7In an orthogonal coordinate with x T x = d and score z, derive the elastic-net coefficient with L1 weight lambda 1 and L2 weight lambda 2 when the coefficient is active and positive.机器学习简单derivation未尝试免费2503MAP Interpretation of Ridge 10Under a Gaussian-noise linear model, what Gaussian prior on beta makes ridge the MAP estimator?机器学习中等derivation未尝试面试订阅2504Compute a Ridge Coefficient Numerically 9In an orthogonal coordinate with d = 9, z = 18, and lambda = 3, what is the ridge coefficient?机器学习中等数值题未尝试免费2505Ridge Never Flips Sign in the Orthogonal One-Feature Case 12In the orthogonal one-feature case with z = x T y, why does ridge preserve the sign of z for every lambda >= 0?机器学习困难derivation未尝试面试订阅2506Why Standardization Matters for Lasso 8Why can lasso unfairly prefer one feature over another if raw feature scales are left unstandardized?机器学习简单essay未尝试免费2507When an Orthogonal Lasso Coordinate Stays Active 13In the orthogonal one-feature case, what inequality on lambda keeps a positive-score coordinate active under lasso?机器学习简单derivation未尝试免费2508Why Elastic Net Keeps the Lasso Threshold but Adds Ridge Shrinkage 14Why does elastic net still need |z| to clear an L1 threshold before a coordinate activates, but then shrink the active coefficient more than lasso does?机器学习中等derivation未尝试面试订阅2509Ridge Norm Shrinks Monotonically With Lambda 15Why should the ridge solution norm typically decrease as lambda increases?机器学习困难derivation未尝试面试订阅2510Zero Lambda Recovers OLS 16Why do ridge and lasso both reduce to OLS when their regularization parameter is set to zero?机器学习困难derivation未尝试面试订阅2511Why L1 Produces Corners and Corners Produce Sparsity 11Why is the geometry of the L1 ball often used to explain why lasso creates sparse solutions?机器学习简单essay未尝试免费2512Lasso Activation Threshold Numerically 18In an orthogonal coordinate with z = 7, what is the smallest lambda that forces the lasso coefficient to zero?机器学习中等数值题未尝试免费2513Why Correlated Features Frustrate Pure Lasso 17Why does pure lasso often behave erratically when several features are highly correlated and similarly predictive?机器学习中等essay未尝试面试订阅2514Equivalent L2 Radius in One Dimension 19In one dimension, if the ridge solution equals beta hat lambda, what radius t makes the constrained problem min RSS(beta) subject to |beta| <= t share the same optimizer?机器学习困难derivation未尝试面试订阅2515Why Small Lambda Means Weak Regularization 20Why does a very small lambda leave the regularized solution close to OLS?机器学习困难derivation未尝试面试订阅2516Coordinate-Descent Update for a Positive Orthogonal Lasso Coordinate 21In an orthogonal coordinate with d = 5, z = 11, and lambda = 3, what coefficient does one exact lasso coordinate-descent update return?机器学习简单数值题未尝试免费