tune() is an argument placeholder to be used with the recipes, parsnip, and
tune packages. It marks recipes step and parsnip model arguments for tuning.
tune(id = "")
A single character value that can be used to differentiate parameters that are used in multiple places but have the same name, or if the user wants to add a note to the specified parameter.
A call object that echos the user's input.
tune() tune("your name here") # In practice, `tune()` is used alongside recipes or parsnip to mark # specific arguments for tuning library(recipes) recipe(mpg ~ ., data = mtcars) %>% step_normalize(all_numeric_predictors()) %>% step_pca(all_numeric_predictors, num_comp = tune())
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