使用插入配方导致重新取样困难

Question

我一直在使用食谱来管理caret::train，这一直进展顺利，但现在我尝试了一些step_transforms，我收到了错误：

Error in resamples.default(model_list) : 
  There are different numbers of resamples in each model

当我比较有和没有变换的模型。与step_centre和step_scale相同的代码工作正常。

library(caret)
library(tidyverse)
library(tidymodels)

formula <- price ~ carat

model_recipe <- recipe(formula, data = diamonds)

quadratic_model_recipe <- recipe(formula, data = diamonds) %>% 
  step_poly(all_predictors())

model_list <- list(
  linear_model = NULL,
  quadratic  = NULL
)

model_list$linear_model <-
  model_recipe %>% train(
    data = diamonds,
    method = "lm",
    trControl = trainControl(method = "cv"))

model_list$quadratic_model <-
  quadratic_model_recipe %>% train(
    data = diamonds,
    method = "lm",
    trControl = trainControl(method = "cv"))

resamp <- resamples(model_list)

Answer 1

quadratic = NULL应该是quadratic_model = NULL