In tidymodels/parsnip: A Common API to Modeling and Analysis Functions

r descr_models("svm_linear", "LiblineaR")

Tuning Parameters

defaults <- 
  tibble::tibble(parsnip = c("cost", "margin"),
                 default = c("1.0", "no default"))

param <-
  svm_linear() %>% 
  set_engine("LiblineaR") %>% 
  make_parameter_list(defaults)

This model has r nrow(param) tuning parameters:

param$item

This engine fits models that are L2-regularized for L2-loss. In the [LiblineaR::LiblineaR()] documentation, these are types 1 (classification) and 11 (regression).

Parsnip changes the default range for cost to c(-10, 5).

Translation from parsnip to the original package (regression)

svm_linear(
  cost = double(1),
  margin = double(1)
) %>%  
  set_engine("LiblineaR") %>% 
  set_mode("regression") %>% 
  translate()

Translation from parsnip to the original package (classification)

svm_linear(
  cost = double(1)
) %>% 
  set_engine("LiblineaR") %>% 
  set_mode("classification") %>% 
  translate()

The margin parameter does not apply to classification models.

Note that the LiblineaR engine does not produce class probabilities. When optimizing the model using the tune package, the default metrics require class probabilities. To use the tune_*() functions, a metric set must be passed as an argument that only contains metrics for hard class predictions (e.g., accuracy).