add extract_fit_time

DESCRIPTION

@@ -25,7 +25,7 @@ Imports:
     ggplot2,
     globals,
     glue,
-    hardhat (>= 1.1.0),
+    hardhat (>= 1.3.1.9000),
     lifecycle,
     magrittr,
     pillar,
@@ -77,4 +77,6 @@ Config/testthat/edition: 3
 Encoding: UTF-8
 LazyData: true
 Roxygen: list(markdown = TRUE)
+Remotes:  
+    tidymodels/hardhat
 RoxygenNote: 7.3.1

NAMESPACE

@@ -29,6 +29,7 @@ S3method(check_args,svm_linear)
 S3method(check_args,svm_poly)
 S3method(check_args,svm_rbf)
 S3method(extract_fit_engine,model_fit)
+S3method(extract_fit_time,model_fit)
 S3method(extract_parameter_dials,model_spec)
 S3method(extract_parameter_set_dials,model_spec)
 S3method(extract_spec_parsnip,model_fit)
@@ -222,6 +223,7 @@ export(discrim_quad)
 export(discrim_regularized)
 export(eval_args)
 export(extract_fit_engine)
+export(extract_fit_time)
 export(extract_parameter_dials)
 export(extract_parameter_set_dials)
 export(extract_spec_parsnip)
@@ -375,6 +377,7 @@ importFrom(generics,varying_args)
 importFrom(ggplot2,autoplot)
 importFrom(glue,glue_collapse)
 importFrom(hardhat,extract_fit_engine)
+importFrom(hardhat,extract_fit_time)
 importFrom(hardhat,extract_parameter_dials)
 importFrom(hardhat,extract_parameter_set_dials)
 importFrom(hardhat,extract_spec_parsnip)

NEWS.md

@@ -1,5 +1,7 @@
 # parsnip (development version)
 
+* New `extract_fit_time()` method has been added that returns the time it took to train the model (#853).
+
 # parsnip 1.2.1
 
 * Added a missing `tidy()` method for survival analysis glmnet models (#1086).

R/extract.R

@@ -14,8 +14,15 @@
 #'
 #' - `extract_parameter_set_dials()` returns a set of dials parameter objects.
 #'
+#' - `extract_fit_time()` returns a tibble with fit times. The fit times
+#'   correspond to the time for the parsnip engine to fit and do not include
+#'   other portions of the elapsed time in [parsnip::fit.model_spec()].
+#'
 #' @param x A parsnip `model_fit` object or a parsnip `model_spec` object.
 #' @param parameter A single string for the parameter ID.
+#' @param summarize A logical for whether the elapsed fit time should be
+#'   returned as a single row or multiple rows. Doesn't support `FALSE` for
+#'   parsnip models.
 #' @param ... Not currently used.
 #' @details
 #' Extracting the underlying engine fit can be helpful for describing the
@@ -127,3 +134,20 @@ eval_call_info <-  function(x) {
 extract_parameter_dials.model_spec <- function(x, parameter, ...) {
   extract_parameter_dials(extract_parameter_set_dials(x), parameter)
 }
+
+#' @export
+#' @rdname extract-parsnip
+extract_fit_time.model_fit <- function(x, summarize = TRUE, ...) {
+  elapsed <- x[["elapsed"]][["elapsed"]][["elapsed"]]
+
+  if (is.na(elapsed) || is.null(elapsed)) {
+    rlang::abort(
+      "This model was fit before `extract_fit_time()` was added."
+    )
+  }
+
+  dplyr::tibble(
+    stage_id = class(x$spec)[1],
+    elapsed = elapsed
+  )
+}

R/fit.R

@@ -453,8 +453,15 @@ allow_sparse <- function(x) {
 #' @export
 print.model_fit <- function(x, ...) {
   cat("parsnip model object\n\n")
-  if (!is.na(x$elapsed[["elapsed"]])) {
-    cat("Fit time: ", prettyunits::pretty_sec(x$elapsed[["elapsed"]]), "\n")
+
+  if (is.null(x$elapsed$print) && !is.na(x$elapsed[["elapsed"]])) {
+    elapsed <- x$elapsed[["elapsed"]]
+    cat("Fit time: ", prettyunits::pretty_sec(elapsed), "\n")
+  }
+
+  if (isTRUE(x$elapsed$print)) {
+    elapsed <- x$elapsed$elapsed[["elapsed"]]
+    cat("Fit time: ", prettyunits::pretty_sec(elapsed), "\n")
   }
 
   if (inherits(x$fit, "try-error")) {

R/fit_helpers.R

@@ -44,29 +44,19 @@ form_form <-
       spec = object
     )
 
-    if (control$verbosity > 1L) {
-      elapsed <- system.time(
-        res$fit <- eval_mod(
-          fit_call,
-          capture = control$verbosity == 0,
-          catch = control$catch,
-          envir = env,
-          ...
-        ),
-        gcFirst = FALSE
-      )
-    } else {
+    elapsed <- system.time(
       res$fit <- eval_mod(
         fit_call,
         capture = control$verbosity == 0,
         catch = control$catch,
         envir = env,
         ...
-      )
-      elapsed <- list(elapsed = NA_real_)
-    }
+      ),
+      gcFirst = FALSE
+    )
     res$preproc <- list(y_var = all.vars(rlang::f_lhs(env$formula)))
-    res$elapsed <- elapsed
+    res$elapsed <- list(elapsed = elapsed, print = control$verbosity > 1L)
+
     res
   }
 
@@ -102,35 +92,24 @@ xy_xy <- function(object, env, control, target = "none", ...) {
 
   res <- list(lvl = levels(env$y), spec = object)
 
-  if (control$verbosity > 1L) {
-    elapsed <- system.time(
-      res$fit <- eval_mod(
-        fit_call,
-        capture = control$verbosity == 0,
-        catch = control$catch,
-        envir = env,
-        ...
-      ),
-      gcFirst = FALSE
-    )
-  } else {
+  elapsed <- system.time(
     res$fit <- eval_mod(
       fit_call,
       capture = control$verbosity == 0,
       catch = control$catch,
       envir = env,
       ...
-    )
-    elapsed <- list(elapsed = NA_real_)
-  }
+    ),
+    gcFirst = FALSE
+  )
 
   if (is.atomic(env$y)) {
     y_name <- character(0)
   } else {
     y_name <- colnames(env$y)
   }
   res$preproc <- list(y_var = y_name)
-  res$elapsed <- elapsed
+  res$elapsed <- list(elapsed = elapsed, print = control$verbosity > 1L)
   res
 }
 
@@ -176,9 +155,9 @@ xy_form <- function(object, env, control, ...) {
   check_outcome(env$y, object)
 
   encoding_info <- get_encoding(class(object)[1])
-  encoding_info <- 
+  encoding_info <-
     vctrs::vec_slice(
-      encoding_info, 
+      encoding_info,
       encoding_info$mode == object$mode & encoding_info$engine == object$engine
     )
 

R/reexports.R

@@ -58,3 +58,6 @@ hardhat::frequency_weights
 #' @export
 hardhat::importance_weights
 
+#' @importFrom hardhat extract_fit_time
+#' @export
+hardhat::extract_fit_time

tests/testthat/_snaps/extract.md

@@ -18,3 +18,11 @@
       i The parsnip extension package baguette implements support for this specification.
       i Please install (if needed) and load to continue.
 
+# extract_fit_time() works
+
+    Code
+      extract_fit_time(lm_fit)
+    Condition
+      Error in `extract_fit_time()`:
+      ! This model was fit before `extract_fit_time()` was added.
+

tests/testthat/test_extract.R

@@ -95,3 +95,22 @@ test_that("extract_parameter_dials doesn't error if namespaced args are used", {
     NA
   )
 })
+
+test_that("extract_fit_time() works", {
+  lm_fit <- linear_reg() %>% fit(mpg ~ ., data = mtcars)
+
+  res <- extract_fit_time(lm_fit)
+
+  expect_true(is_tibble(res))
+  expect_identical(names(res), c("stage_id", "elapsed"))
+  expect_identical(res$stage_id, "linear_reg")
+  expect_true(is.double(res$elapsed))
+  expect_true(res$elapsed >= 0)
+
+  lm_fit$elapsed$elapsed <- NULL
+
+  expect_snapshot(
+    error = TRUE,
+    extract_fit_time(lm_fit)
+  )
+})