Tabular ridge xgb stacking
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- **wenmin-wu/tabular-ridge-xgb-stacking**: Two-stage stacking where Ridge regression on OHE+scaled features produces OOF predictions fed as an extra feature to XGBoost, letting the tree model correct non-linear residuals on top of captured linear patterns. Read `references/wenmin-wu/skills/tabular/ridge-xgb-stacking/SKILL.md`.
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