描述
我正在尝试调整配方中的自定义参数，但遇到困难。我的印象是，这只是在配方中调用 tune("variableID") ，然后使用 tune_grid() 与包含列 变量ID。
但是，这似乎不起作用，所以我想出了一个表示来说明我的方法。请注意，tune_grid() 甚至没有检测到调整参数。我在这里做错了什么？
我还尝试研究其他人是如何做到这一点的，但我在这里能找到的唯一与我的问题接近的问题是 here并且 tune() 按预期使用。
代表
library(tidyverse)
library(tidymodels)
#> Registered S3 method overwritten by 'tune':
#> method from
#> required_pkgs.model_spec parsnip
iris_splits <- vfold_cv(iris)
glmnet_recipe <-
recipe(formula = Species ~ Sepal.Length + Petal.Length, data = iris) %>%
step_mutate(Sepal.Length = round(Sepal.Length), digits = tune("digits")) %>%
step_zv(all_predictors()) %>%
step_normalize(all_predictors(), -all_nominal())
glmnet_spec <-
multinom_reg(penalty = 0, mixture = 0) %>%
set_mode("classification") %>%
set_engine("glmnet")
glmnet_workflow <-
workflow() %>%
add_recipe(glmnet_recipe) %>%
add_model(glmnet_spec)
glmnet_grid <- expand_grid(digits = c(0, 1))
glmnet_tune <-
tune_grid(glmnet_workflow, resamples = iris_splits, grid = glmnet_grid)
#> Warning: No tuning parameters have been detected, performance will be evaluated
#> using the resamples with no tuning. Did you want to [tune()] parameters?
#> x Fold01: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold02: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold03: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold04: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold05: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold06: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold07: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold08: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold09: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> x Fold10: preprocessor 1/1: Error: Problem with `mutate()` column `digits`.
#> i `dig...
#> Warning: All models failed. See the `.notes` column.
glmnet_tune$.notes[[1]]$.notes
#> [1] "preprocessor 1/1: Error: Problem with `mutate()` column `digits`.\ni `digits = tune(\"digits\")`.\nx `digits` must be a vector, not a call."
show_best(glmnet_tune)
#> Warning: No value of `metric` was given; metric 'roc_auc' will be used.
#> Error: All of the models failed. See the .notes column.
由 reprex package 于 2021 年 6 月 15 日创建(v2.0.0)
session 信息sessioninfo::session_info()
#> - Session info ---------------------------------------------------------------
#> setting value
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#> ctype German_Germany.1252
#> tz Europe/Berlin
#> date 2021-06-15
#>
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最佳答案
配方步骤需要有一个可调 S3 方法，用于您想要调整的任何参数，例如数字。
查看this article about creating your own recipe step ，但我认为您不需要完全创建自己的食谱步骤；您只需为您正在使用的步骤创建一个可调方法，该方法位于"Other step methods"下.
关于r - 如何调整 tidymodels 配方参数？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/67991125/