Core Feature Engineering

Core Feature Engineering

When Automated Feature Selection Misses the Real Predictive Structure

Automated feature selection is a time-saver—until it isn't. You run Boruta, RFE, or LASSO, get a neat list of top features, feed them into your model,...

Core Feature Engineering

Choosing Interaction Terms Without Overfitting Your Validation Set

You have built a solid main-effect model—linear regression, maybe a gradient booster with default feature. But the residuals still hum with unexplaine...

Core Feature Engineering

Why Polynomial Features Often Hurt More Than They Help in High Dimensions

You add polynomial features to capture curvature. Your validation score drops. You remove them. Score goes back up. This isn't a bug — it's the curse ...