# NOT RUN {
library("mlr3")
nop = po("nop")
nop$train(list(1))
# use `gunion` and `%>>%` to create a "bypass"
# next to "pca"
gr = gunion(list(
po("pca"),
nop
)) %>>% po("featureunion")
gr$train(tsk("iris"))[[1]]$data()
# }
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