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# Lazily registered in .onLoad()
tune_args_recipe <- function(object, full = FALSE, ...) {
steps <- object$steps
if (length(steps) == 0L) {
return(tune_tbl())
}
res <- purrr::map_dfr(object$steps, tune_args, full = full)
tune_tbl(
res$name,
res$tunable,
res$id,
res$source,
res$component,
res$component_id,
full = full
)
}
# @export - lazily and conditionally registered in .onLoad()
tune_args_step <- function(object, full = FALSE, ...) {
step_id <- object$id
# Grab the step class before the subset, as that removes the class
step_type <- class(object)[1]
tune_param_list <- tunable(object)$name
# remove the non-tunable arguments as they are not important
object <- object[tune_param_list]
# Remove NULL argument steps. These are reserved
# for deprecated args or those set at prep() time.
object <- object[!purrr::map_lgl(object, is.null)]
res <- purrr::map_chr(object, find_tune_id)
res <- ifelse(res == "", names(res), res)
tune_tbl(
name = names(res),
tunable = unname(!is.na(res)),
id = unname(res),
source = "recipe",
component = step_type,
component_id = step_id,
full = full
)
}
# @export - lazily and conditionally registered in .onLoad()
tune_args_check <- tune_args_step
# helpers for tune_args() methods -----------------------------------------
# they also exist in parsnip for the `tune_args()` method there
# useful for standardization and for creating a 0 row tunable tbl
# (i.e. for when there are no steps in a recipe)
tune_tbl <- function(name = character(),
tunable = logical(),
id = character(),
source = character(),
component = character(),
component_id = character(),
full = FALSE) {
complete_id <- id[!is.na(id)]
dups <- duplicated(complete_id)
if (any(dups)) {
stop("There are duplicate `id` values listed in [tune()]: ",
paste0("'", unique(complete_id[dups]), "'", collapse = ", "),
".",
sep = "", call. = FALSE
)
}
vry_tbl <- tibble::tibble(
name = as.character(name),
tunable = as.logical(tunable),
id = as.character(id),
source = as.character(source),
component = as.character(component),
component_id = as.character(component_id)
)
if (!full) {
vry_tbl <- vry_tbl[vry_tbl$tunable, ]
}
vry_tbl
}
# Return the `id` arg in tune(); if not specified, then returns "" or if not
# a tunable arg then returns NA_character_
tune_id <- function(x) {
if (is.null(x)) {
return(NA_character_)
} else {
if (rlang::is_quosures(x)) {
# Try to evaluate to catch things in the global envir.
.x <- try(purrr::map(x, rlang::eval_tidy), silent = TRUE)
if (inherits(.x, "try-error")) {
x <- purrr::map(x, rlang::quo_get_expr)
} else {
x <- .x
}
if (is.null(x)) {
return(NA_character_)
}
}
# [tune()] will always return a call object
if (is.call(x)) {
if (rlang::call_name(x) == "tune") {
# If an id was specified:
if (length(x) > 1) {
return(x[[2]])
} else {
# no id
return("")
}
return(x$id)
} else {
return(NA_character_)
}
}
}
NA_character_
}
find_tune_id <- function(x) {
# STEP 1 - Early exits
# Early exit for empty elements (like list())
if (length(x) == 0L) {
return(NA_character_)
}
# turn quosures into expressions before continuing
if (rlang::is_quosures(x)) {
# Try to evaluate to catch things in the global envir. If it is a dplyr
# selector, it will fail to evaluate.
.x <- try(purrr::map(x, rlang::eval_tidy), silent = TRUE)
if (inherits(.x, "try-error")) {
x <- purrr::map(x, rlang::quo_get_expr)
} else {
x <- .x
}
}
id <- tune_id(x)
if (!is.na(id)) {
return(id)
}
if (is.atomic(x) | is.name(x) | length(x) == 1) {
return(NA_character_)
}
# STEP 2 - Recursion
# tunable_elems <- purrr::map_lgl(x, find_tune)
tunable_elems <- vector("character", length = length(x))
# use purrr::map_lgl
for (i in seq_along(x)) {
tunable_elems[i] <- find_tune_id(x[[i]])
}
tunable_elems <- tunable_elems[!is.na(tunable_elems)]
if (length(tunable_elems) == 0) {
tunable_elems <- NA_character_
}
if (sum(tunable_elems == "", na.rm = TRUE) > 1) {
stop(
"Only one tunable value is currently allowed per argument. ",
"The current argument has: `",
paste0(deparse(x), collapse = ""),
"`.",
call. = FALSE
)
}
return(tunable_elems)
}
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