2 papers
cs.LG2026
Beyond Negative-Ridge Endpoints: Mixed-Sign Spectral Regularization via Negative-Shifted Gradient Descent
Peng Zhao
In overparameterized linear regression, many weak spectral directions act like a ridge penalty on the signal-bearing spectrum; negative ridge is the natural correction, pushing fil…
math.ST2026
De-floored Principal Component Regression: When Rank Selection Alone Is Insufficient for Prediction
Peng Zhao
Principal component regression (PCR) regularizes high-dimensional prediction by choosing a spectral cutoff, but rank selection cannot correct systematic inflation of the retained e…