Determine required packages for a model

Usage

# S3 method for model_spec
required_pkgs(x, infra = TRUE, ...)

# S3 method for model_fit
required_pkgs(x, infra = TRUE, ...)

Arguments

x: A model specification or fit.
infra: Should parsnip itself be included in the result?
...: Not used.

Value

A character vector

Examples

should_fail <- try(required_pkgs(linear_reg(engine = NULL)), silent = TRUE)
should_fail
#> [1] "Error in required_pkgs(linear_reg(engine = NULL)) : Please set an engine.\n"
#> attr(,"class")
#> [1] "try-error"
#> attr(,"condition")
#> <error/rlang_error>
#> Error in `required_pkgs()`:
#> ! Please set an engine.
#> ---
#> Backtrace:
#>   1. pkgdown::build_site_github_pages(new_process = FALSE, install = FALSE)
#>   2. pkgdown::build_site(...)
#>   3. pkgdown:::build_site_local(...)
#>   4. pkgdown::build_reference(...)
#>   5. purrr::map(...)
#>   6. pkgdown .f(.x[[i]], ...)
#>   8. pkgdown:::data_reference_topic(...)
#>   9. pkgdown:::run_examples(...)
#>  10. pkgdown:::highlight_examples(code, topic, env = env)
#>  11. downlit::evaluate_and_highlight(...)
#>  12. evaluate::evaluate(code, child_env(env), new_device = TRUE, output_handler = output_handler)
#>  13. evaluate:::evaluate_call(...)
#>  23. evaluate:::eval_with_user_handlers(expr, envir, enclos, user_handlers)
#>  24. [ base::eval(...) ] with 1 more call
#>  32. parsnip:::required_pkgs.model_spec(linear_reg(engine = NULL))

linear_reg() %>%
  set_engine("glmnet") %>%
  required_pkgs()
#> [1] "parsnip" "glmnet" 

linear_reg() %>%
  set_engine("glmnet") %>%
  required_pkgs(infra = FALSE)
#> [1] "glmnet"

linear_reg() %>%
  set_engine("lm") %>%
  fit(mpg ~ ., data = mtcars) %>%
  required_pkgs()
#> [1] "parsnip" "stats"