Spline

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Spline models fit smooth nonlinear functions of the predictors using basis expansions.

Pass any model string below as Arm(model=...). Extra names an optional dependency, Scaling flags whether predictors should be standardized, and Tunable counts the hyperparameters the search space exposes.

Model string	Description	Input	Extra	Scaling	Recommended preprocessing	Tunable
mars	Package-native MARS-style hinge-basis regression.	supervised	none	no	default	3

Reference

• Models reference page for ModelSpec, ModelFit, and fit conventions.