R Under development (unstable) (2024-07-17 r86903 ucrt) -- "Unsuffered Consequences"
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> suppressWarnings(RNGversion("3.5.2"))
> 
> ## packages
> library("partykit")
Loading required package: grid
Loading required package: libcoin
Loading required package: mvtnorm
> library("rpart")
> 
> ## data-generating process
> dgp <- function(n)
+     data.frame(y = gl(4, n), x1 = rnorm(4 * n), x2 = rnorm(4 * n))
> 
> ## rpart check
> learn <- dgp(100)
> fit <- as.party(rpart(y ~ ., data = learn))
> test <- dgp(100000)
> system.time(id <- fitted_node(node_party(fit), test))
   user  system elapsed 
   0.16    0.06    0.22 
> system.time(yhat <- predict_party(fit, id = id, newdata = test))
   user  system elapsed 
   0.04    0.00    0.05 
> 
> ### predictions in info slots
> tmp <- data.frame(x = rnorm(100))
> pfit <- party(node = partynode(1L, split = partysplit(1L, breaks = 0), 
+               kids = list(partynode(2L, info = -0.5), partynode(3L, info = 0.5))), data = tmp)
> pfit
[1] root
|   [2] x <= 0: -0.5
|   [3] x > 0: 0.5
> p <- predict(pfit, newdata = tmp)
> p
  1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20 
  2   2   2   2   3   3   3   3   2   3   2   3   3   3   3   3   2   3   3   2 
 21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40 
  3   3   2   2   2   2   3   3   3   3   2   3   2   3   3   2   3   2   3   2 
 41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60 
  3   2   2   2   2   3   3   3   3   3   3   2   3   3   2   3   2   3   2   3 
 61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80 
  3   2   3   3   3   3   3   3   3   2   3   2   3   3   3   2   3   2   2   2 
 81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99 100 
  2   2   3   3   3   3   2   2   2   2   2   2   2   2   3   2   2   3   2   3 
> table(p, sign(tmp$x))
   
p   -1  1
  2 45  0
  3  0 55
> 
> proc.time()
   user  system elapsed 
   1.96    0.29    2.20