mixture {dials}

Mixture of penalization terms

Description

A numeric parameter function representing the relative amount of penalties (e.g. L1, L2, etc) in regularized models.

Usage

mixture(range = c(0, 1), trans = NULL)

Arguments

range

A two-element vector holding the defaults for the smallest and largest possible values, respectively. If a transformation is specified, these values should be in the transformed units.

trans

A trans object from the scales package, such as scales::transform_log10() or scales::transform_reciprocal(). If not provided, the default is used which matches the units used in range. If no transformation, NULL.

Details

This parameter is used for regularized or penalized models such as parsnip::linear_reg(), parsnip::logistic_reg(), and others. It is formulated as the proportion of L1 regularization (i.e. lasso) in the model. In the glmnet model, mixture = 1 is a pure lasso model while mixture = 0 indicates that ridge regression is being used.

Examples

mixture()