mlr3pipelines

Preprocessing Operators and Pipelines for 'mlr3'

v0.11.0 · Feb 28, 2026 · LGPL-3

Description

Dataflow programming toolkit that enriches 'mlr3' with a diverse set of pipelining operators ('PipeOps') that can be composed into graphs. Operations exist for data preprocessing, model fitting, and ensemble learning. Graphs can themselves be treated as 'mlr3' 'Learners' and can therefore be resampled, benchmarked, and tuned.

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CRAN Check Status

3 ERROR

11 OK

Show all 14 flavors

Flavor	Status	Time
r-devel-linux-x86_64-debian-clang	OK	768.9s
r-devel-linux-x86_64-debian-gcc	OK	519.1s
r-devel-linux-x86_64-fedora-clang	OK	1315.5s
r-devel-linux-x86_64-fedora-gcc	OK	1107.5s
r-devel-macos-arm64	OK	118s
r-devel-windows-x86_64	OK	597s
r-oldrel-macos-arm64	ERROR	115s
r-oldrel-macos-x86_64	ERROR	434s
r-oldrel-windows-x86_64	ERROR	691s
r-patched-linux-x86_64	OK	742.2s
r-release-linux-x86_64	OK	674.6s
r-release-macos-arm64	OK	121s
r-release-macos-x86_64	OK	911s
r-release-windows-x86_64	OK	553s

Check details (6 non-OK)

ERROR r-oldrel-macos-arm64

examples

Running examples in ‘mlr3pipelines-Ex.R’ failed
The error most likely occurred in:

> ### Name: mlr_pipeops_nmf
> ### Title: Non-negative Matrix Factorization
> ### Aliases: mlr_pipeops_nmf PipeOpNMF
> 
> ### ** Examples
> 
> ## Don't show: 
> if (mlr3misc::require_namespaces(c("NMF", "MASS"), quietly = TRUE)) withAutoprint({ # examplesIf
+ ## End(Don't show)
+ ## Don't show: 
+ # NMF attaches these packages to search path on load, #929
+ lapply(c("package:Biobase", "package:BiocGenerics", "package:generics"), detach, character.only = TRUE)
+ ## End(Don't show)
+ library("mlr3")
+ 
+ task = tsk("iris")
+ pop = po("nmf")
+ 
+ task$data()
+ pop$train(list(task))[[1]]$data()
+ 
+ pop$state
+ ## Don't show: 
+ # BiocGenerics overwrites printer for our tables mlr-org/mlr3#1112
+ # Necessary as detaching packages does not remove registered S3 methods
+ suppressWarnings(try(rm("format.list", envir = .BaseNamespaceEnv$.__S3MethodsTable__.), silent = TRUE))
+ ## End(Don't show)
+ ## Don't show: 
+ }) # examplesIf
> lapply(c("package:Biobase", "package:BiocGenerics", "package:generics"), 
+     detach, character.only = TRUE)
Error in FUN(X[[i]], ...) : invalid 'name' argument
Calls: withAutoprint ... withVisible -> eval -> eval -> lapply -> lapply -> FUN
Execution halted

ERROR r-oldrel-macos-arm64

tests

Running ‘testthat.R’ [89s/44s]
Running the tests in ‘tests/testthat.R’ failed.
Complete output:
  > if (requireNamespace("testthat", quietly = TRUE)) {
  +   library("checkmate")
  +   library("testthat")
  +   library("mlr3")
  +   library("paradox")
  +   library("mlr3pipelines")
  +   test_check("mlr3pipelines")
  + }
  Starting 2 test processes.
  > test_Graph.R: Training debug.multi with input list(input_1 = 1, input_2 = 1)
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotr
...[truncated]...
is"))) at test_pipeop_nmf.R:98:3
    2. │ └─mlr3pipelines:::.__PipeOp__train(...)
    3. │   ├─base::withCallingHandlers(...)
    4. │   └─private$.train(input)
    5. │     └─mlr3pipelines:::.__PipeOpTaskPreproc__.train(...)
    6. │       └─private$.train_task(intask)
    7. │         └─mlr3pipelines:::.__PipeOpTaskPreproc__.train_task(...)
    8. │           ├─data.table::as.data.table(...)
    9. │           └─private$.train_dt(dt, task$levels(cols), task$truth())
   10. │             └─mlr3pipelines:::.__PipeOpNMF__.train_dt(...)
   11. │               └─mlr3misc::map(to_be_detached, detach, character.only = TRUE)
   12. │                 └─base::lapply(.x, .f, ...)
   13. │                   └─base (local) FUN(X[[i]], ...)
   14. │                     └─base::stop("invalid 'name' argument")
   15. └─base::.handleSimpleError(...)
   16.   └─mlr3pipelines (local) h(simpleError(msg, call))
  
  [ FAIL 6 | WARN 0 | SKIP 128 | PASS 8754 ]
  Error:
  ! Test failures.
  Execution halted

ERROR r-oldrel-macos-x86_64

examples

Running examples in ‘mlr3pipelines-Ex.R’ failed
The error most likely occurred in:

> ### Name: mlr_pipeops_nmf
> ### Title: Non-negative Matrix Factorization
> ### Aliases: mlr_pipeops_nmf PipeOpNMF
> 
> ### ** Examples
> 
> ## Don't show: 
> if (mlr3misc::require_namespaces(c("NMF", "MASS"), quietly = TRUE)) withAutoprint({ # examplesIf
+ ## End(Don't show)
+ ## Don't show: 
+ # NMF attaches these packages to search path on load, #929
+ lapply(c("package:Biobase", "package:BiocGenerics", "package:generics"), detach, character.only = TRUE)
+ ## End(Don't show)
+ library("mlr3")
+ 
+ task = tsk("iris")
+ pop = po("nmf")
+ 
+ task$data()
+ pop$train(list(task))[[1]]$data()
+ 
+ pop$state
+ ## Don't show: 
+ # BiocGenerics overwrites printer for our tables mlr-org/mlr3#1112
+ # Necessary as detaching packages does not remove registered S3 methods
+ suppressWarnings(try(rm("format.list", envir = .BaseNamespaceEnv$.__S3MethodsTable__.), silent = TRUE))
+ ## End(Don't show)
+ ## Don't show: 
+ }) # examplesIf
> lapply(c("package:Biobase", "package:BiocGenerics", "package:generics"), 
+     detach, character.only = TRUE)
Error in FUN(X[[i]], ...) : invalid 'name' argument
Calls: withAutoprint ... withVisible -> eval -> eval -> lapply -> lapply -> FUN
Execution halted

ERROR r-oldrel-macos-x86_64

tests

Running ‘testthat.R’ [257s/212s]
Running the tests in ‘tests/testthat.R’ failed.
Complete output:
  > if (requireNamespace("testthat", quietly = TRUE)) {
  +   library("checkmate")
  +   library("testthat")
  +   library("mlr3")
  +   library("paradox")
  +   library("mlr3pipelines")
  +   test_check("mlr3pipelines")
  + }
  Starting 2 test processes.
  > test_Graph.R: Training debug.multi with input list(input_1 = 1, input_2 = 1)
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_auto
...[truncated]...
is"))) at test_pipeop_nmf.R:98:3
    2. │ └─mlr3pipelines:::.__PipeOp__train(...)
    3. │   ├─base::withCallingHandlers(...)
    4. │   └─private$.train(input)
    5. │     └─mlr3pipelines:::.__PipeOpTaskPreproc__.train(...)
    6. │       └─private$.train_task(intask)
    7. │         └─mlr3pipelines:::.__PipeOpTaskPreproc__.train_task(...)
    8. │           ├─data.table::as.data.table(...)
    9. │           └─private$.train_dt(dt, task$levels(cols), task$truth())
   10. │             └─mlr3pipelines:::.__PipeOpNMF__.train_dt(...)
   11. │               └─mlr3misc::map(to_be_detached, detach, character.only = TRUE)
   12. │                 └─base::lapply(.x, .f, ...)
   13. │                   └─base (local) FUN(X[[i]], ...)
   14. │                     └─base::stop("invalid 'name' argument")
   15. └─base::.handleSimpleError(...)
   16.   └─mlr3pipelines (local) h(simpleError(msg, call))
  
  [ FAIL 6 | WARN 0 | SKIP 128 | PASS 8754 ]
  Error:
  ! Test failures.
  Execution halted

ERROR r-oldrel-windows-x86_64

examples

Running examples in 'mlr3pipelines-Ex.R' failed
The error most likely occurred in:

> ### Name: mlr_pipeops_nmf
> ### Title: Non-negative Matrix Factorization
> ### Aliases: mlr_pipeops_nmf PipeOpNMF
> 
> ### ** Examples
> 
> ## Don't show: 
> if (mlr3misc::require_namespaces(c("NMF", "MASS"), quietly = TRUE)) withAutoprint({ # examplesIf
+ ## End(Don't show)
+ ## Don't show: 
+ # NMF attaches these packages to search path on load, #929
+ lapply(c("package:Biobase", "package:BiocGenerics", "package:generics"), detach, character.only = TRUE)
+ ## End(Don't show)
+ library("mlr3")
+ 
+ task = tsk("iris")
+ pop = po("nmf")
+ 
+ task$data()
+ pop$train(list(task))[[1]]$data()
+ 
+ pop$state
+ ## Don't show: 
+ # BiocGenerics overwrites printer for our tables mlr-org/mlr3#1112
+ # Necessary as detaching packages does not remove registered S3 methods
+ suppressWarnings(try(rm("format.list", envir = .BaseNamespaceEnv$.__S3MethodsTable__.), silent = TRUE))
+ ## End(Don't show)
+ ## Don't show: 
+ }) # examplesIf
> lapply(c("package:Biobase", "package:BiocGenerics", "package:generics"), 
+     detach, character.only = TRUE)
Error in FUN(X[[i]], ...) : invalid 'name' argument
Calls: withAutoprint ... withVisible -> eval -> eval -> lapply -> lapply -> FUN
Execution halted

ERROR r-oldrel-windows-x86_64

tests

Running 'testthat.R' [244s]
Running the tests in 'tests/testthat.R' failed.
Complete output:
  > if (requireNamespace("testthat", quietly = TRUE)) {
  +   library("checkmate")
  +   library("testthat")
  +   library("mlr3")
  +   library("paradox")
  +   library("mlr3pipelines")
  +   test_check("mlr3pipelines")
  + }
  Starting 2 test processes.
  > test_Graph.R: Training debug.multi with input list(input_1 = 1, input_2 = 1)
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Training test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Predicting test_autotrain
  > test_PipeOp.R: Training test_autotrain
...[truncated]...
is"))) at test_pipeop_nmf.R:98:3
    2. │ └─mlr3pipelines:::.__PipeOp__train(...)
    3. │   ├─base::withCallingHandlers(...)
    4. │   └─private$.train(input)
    5. │     └─mlr3pipelines:::.__PipeOpTaskPreproc__.train(...)
    6. │       └─private$.train_task(intask)
    7. │         └─mlr3pipelines:::.__PipeOpTaskPreproc__.train_task(...)
    8. │           ├─data.table::as.data.table(...)
    9. │           └─private$.train_dt(dt, task$levels(cols), task$truth())
   10. │             └─mlr3pipelines:::.__PipeOpNMF__.train_dt(...)
   11. │               └─mlr3misc::map(to_be_detached, detach, character.only = TRUE)
   12. │                 └─base::lapply(.x, .f, ...)
   13. │                   └─base (local) FUN(X[[i]], ...)
   14. │                     └─base::stop("invalid 'name' argument")
   15. └─base::.handleSimpleError(...)
   16.   └─mlr3pipelines (local) h(simpleError(msg, call))
  
  [ FAIL 6 | WARN 0 | SKIP 128 | PASS 8754 ]
  Error:
  ! Test failures.
  Execution halted

Check History

ERROR 11 OK · 0 NOTE · 0 WARNING · 3 ERROR · 0 FAILURE Mar 10, 2026

ERROR r-oldrel-macos-arm64

examples

Running examples in ‘mlr3pipelines-Ex.R’ failed
The error most likely occurred in:

> ### Name: mlr_pipeops_nmf
> ### Title: Non-negative Matrix Factorization
> ### Aliases: mlr_pipeops_nmf PipeOpNMF
> 
> ### ** Examples
> 
> ## Don't show: 
> if (ml
...[truncated]...
"package:Biobase", "package:BiocGenerics", "package:generics"), 
+     detach, character.only = TRUE)
Error in FUN(X[[i]], ...) : invalid 'name' argument
Calls: withAutoprint ... withVisible -> eval -> eval -> lapply -> lapply -> FUN
Execution halted

ERROR r-oldrel-macos-x86_64

examples

Running examples in ‘mlr3pipelines-Ex.R’ failed
The error most likely occurred in:

> ### Name: mlr_pipeops_nmf
> ### Title: Non-negative Matrix Factorization
> ### Aliases: mlr_pipeops_nmf PipeOpNMF
> 
> ### ** Examples
> 
> ## Don't show: 
> if (ml
...[truncated]...
"package:Biobase", "package:BiocGenerics", "package:generics"), 
+     detach, character.only = TRUE)
Error in FUN(X[[i]], ...) : invalid 'name' argument
Calls: withAutoprint ... withVisible -> eval -> eval -> lapply -> lapply -> FUN
Execution halted

ERROR r-oldrel-windows-x86_64

examples

Running examples in 'mlr3pipelines-Ex.R' failed
The error most likely occurred in:

> ### Name: mlr_pipeops_nmf
> ### Title: Non-negative Matrix Factorization
> ### Aliases: mlr_pipeops_nmf PipeOpNMF
> 
> ### ** Examples
> 
> ## Don't show: 
> if (ml
...[truncated]...
"package:Biobase", "package:BiocGenerics", "package:generics"), 
+     detach, character.only = TRUE)
Error in FUN(X[[i]], ...) : invalid 'name' argument
Calls: withAutoprint ... withVisible -> eval -> eval -> lapply -> lapply -> FUN
Execution halted

Reverse Dependencies (22)

depends

mlr3fda mlr3torch

imports

VIM mcboost mlr3fairness mlr3shiny mlr3verse sense spFSR

suggests

DoubleML counterfactuals mlr3filters mlr3fselect mlr3hyperband mlr3mbo mlr3resampling mlr3spatiotempcv mlr3summary mlr3tuning mlr3tuningspaces mlrintermbo xtdml

Dependency Network

Version History

new 0.11.0 Mar 10, 2026

updated 0.11.0 ← 0.9.0 diff Feb 28, 2026

updated 0.10.0 ← 0.8.0 diff Nov 27, 2025

updated 0.9.0 ← 0.10.0 diff Nov 27, 2025

updated 0.8.0 ← 0.7.2 diff Jun 16, 2025

updated 0.7.2 ← 0.7.1 diff Mar 6, 2025

updated 0.7.1 ← 0.7.0 diff Nov 13, 2024

updated 0.7.0 ← 0.6.0 diff Sep 23, 2024

updated 0.6.0 ← 0.5.2 diff Jun 30, 2024

updated 0.5.2 ← 0.5.1 diff Apr 22, 2024

updated 0.5.1 ← 0.5.0-2 diff Mar 25, 2024

updated 0.5.0-2 ← 0.5.0-1 diff Dec 7, 2023

updated 0.5.0 ← 0.4.3 diff May 21, 2023

updated 0.5.0-1 ← 0.5.0 diff May 21, 2023

updated 0.4.3 ← 0.4.2 diff Mar 22, 2023

updated 0.4.2 ← 0.4.1 diff Sep 20, 2022

updated 0.4.1 ← 0.4.0 diff May 14, 2022

updated 0.4.0 ← 0.3.6-1 diff Nov 14, 2021

updated 0.3.6-1 ← 0.3.6 diff Oct 5, 2021

updated 0.3.6 ← 0.3.5-1 diff Sep 6, 2021