如何在端点Plumber API中打印出模型信息？

Question

我有一个随机森林模型，我想在水管工API上创建一个端点，以打印出有关模型的信息。当我这样做时：

print(model_rf_under)

我得到：

Random Forest 

199366 samples
    30 predictor
     2 classes: '0', '1' 

Pre-processing: scaled (30), centered (30) 
Resampling: Cross-Validated (20 fold, repeated 3 times) 
Summary of sample sizes: 189398, 189397, 189398, 189398, 189397, 189397, ... 
Addtional sampling using down-sampling prior to pre-processing

Resampling results across tuning parameters:

  mtry  Accuracy   Kappa     
   2    0.9795702  0.13258320
  16    0.9621216  0.07634040
  30    0.9569368  0.06746579

Accuracy was used to select the optimal model using the largest value.
The final value used for the model was mtry = 2.

我想在名为 / model_info 的端点上输出此输出。 所以我尝试了一些方法：

library(plumber)
library(htmlwidgets)

load('modeloRF.RData')

#
#* @get /model_info
function(){
 print(model_rf_under)
}

#* @html
#* @get /model_info2
function(){
  print(model_rf_under)
}

#* @htmlwidgets
#* @get /model_info3
function(){
  print(model_rf_under)
}

但是当我这样做时：

curl http://localhost:8000/model_info

我得到以下输出：

[[" 2","0.9795702","0.13258320"],["16","0.9621216","0.07634040"],["30","0.9569368","0.06746579"]]

我的模型的代码和.RData可以下载here。