> print(group_vfold_cv(warpbreaks, "tension"), n = 2)
# Group 3-fold cross-validation 
# A tibble: 3 x 2
  splits          id       
  <list>          <chr>    
1 <split [36/18]> Resample1
2 <split [36/18]> Resample2
# ... with 1 more row

