rename featureunion in ppls

NEWS.md

@@ -1,5 +1,6 @@
 # mlr3pipelines 0.5.0-9000
 
+* Changed the ID of `PipeOpFeatureUnion` used in `ppl("robustify")` and `ppl("stacking")`
 * Feature: The `$add_pipeop()` method got an argument `clone` (old behaviour `TRUE` by default)
 * Bugfix: `PipeOpFeatureUnion` in some rare cases dropped variables called `"x"`
 * Compatibility with upcoming paradox release

R/pipeline_robustify.R

@@ -170,7 +170,7 @@ pipeline_robustify = function(task = NULL, learner = NULL,
       imputing,
       po("missind", affect_columns = selector_type(c("numeric", "integer", "logical")), type = if (missind_numeric) "numeric" else "factor")
     )),
-    if (has_numbers || has_logicals) po("featureunion"),
+    if (has_numbers || has_logicals) po("featureunion", id = "featureunion_robustify"),
     if (has_factorials) po("imputeoor")
   )
 

R/pipeline_stacking.R

@@ -53,7 +53,7 @@ pipeline_stacking = function(base_learners, super_learner, method = "cv", folds
   if (use_features) base_learners_cv = c(base_learners_cv, po("nop"))
 
   gunion(base_learners_cv, in_place = TRUE) %>>!%
-     po("featureunion") %>>!%
+     po("featureunion", id = "featureunion_stacking") %>>!%
      super_learner
 }
 

tests/testthat/test_ppl.R

@@ -57,3 +57,19 @@ test_that("mlr_pipeops multi-access works", {
   expect_equal(ppls(), mlr_graphs)
 
 })
+
+test_that("mlr3book authors don't sleepwalk through life", {
+
+  tasks = tsks(c("breast_cancer", "sonar"))
+
+
+  glrn_stack = as_learner(ppl("robustify") %>>% ppl("stacking",
+      lrns(c("classif.rpart", "classif.debug")),
+      lrn("classif.log_reg")
+  ))
+  glrn_stack$id = "Stack"
+
+  learners = c(glrn_stack)
+  bmr = benchmark(benchmark_grid(tasks, learners, rsmp("cv", folds = 3)))
+
+})