R Observatory: Metrics for mlr3 version 1.8.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

mlr3

1.8.0Package record

Machine Learning in R - Next Generation

45packages dependsuggested by 21

319.6Kdownloads / year

–test coverage

13/13flavors OK

Overview

About

Maintained by Marc BeckerCRAN page ↗GitHub ↗Website ↗Issues ↗

Efficient, object-oriented programming on the building blocks of machine learning. Provides 'R6' objects for tasks, learners, resamplings, and measures. The package is geared towards scalability and larger datasets by supporting parallelization and out-of-memory data-backends like databases. While 'mlr3' focuses on the core computational operations, add-on packages provide additional functionality.

Changes in 1.8.0

feat: Added msr("best_valid_score") (mlr_measures_best_valid_score), which reports the *best* internal validation score observed during training/
feat: Added the diabetes task (mlr_tasks_diabetes) for the synthetic mlbench::SynthDiabetes2 data set, which has the same structure as the former pima task including missing values, for use in examples and tests.
BREAKING CHANGE: Removed the pima task (mlr_tasks_pima) because the PimaIndiansDiabetes2 data set was removed from the mlbench package, use tsk("diabetes") instead.
perf: TaskClassif$print() now caches the class distribution of the target column and only recomputes it when the task hash changes. Querying the target column can be slow for tasks with many rows.

From NEWS.md in the release

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("mlr3", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("mlr-org/mlr3")

Development version from mlr-org/mlr3. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-mlr3

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-mlr3

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-mlr3

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 16.1 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-08-27
ERROR9 OK, 1 NOTE, 3 ERROR2026-07-25
NOTE12 OK, 1 NOTE2026-07-11
OK13 OK2026-07-04
WARNING12 OK, 1 WARNING2026-07-03

Show 4 earlier changesHide 4 earlier changes

OK13 OK2026-06-09
ERROR12 OK, 1 ERROR2026-06-08
OK14 OK2026-04-08
NOTE13 OK, 1 NOTE2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 1.8.0

READMEYes · 1,023 wordsVignettesNoNEWSYes · 100% structured · mentions 1.8.0Citation fileYes · cites a publicationWebsiteYes · pkgdown

Cites a JOSS paper

Help pages: 174 (12 internal)includes a package overview page
Examples that run: 100%72 run in a plain check
Exported functions with examples: 64%
Documented parameters: 95%
Return-value docs: 23%
Help pages citing references: 8%

How these are measured

Downloads

319.6K

CRAN downloads in the past year

Rank #780 · ~876/day · ~26.6K/mo

Releases R versions

Daily download trend is not available in this view yet.

15.5K30 days

61K90 days

319.6K1 year

Compare downloads with other packages →

Also on31K r2u4 autocran35.9K conda_forge145 c2d4u

How downloads are counted

Repository

mlr-org/mlr3 ↗Organization: mlr-org

1,082Stars

98Forks

23Open issues

13Open PRs

52Releases

2,354Commits

30Commit identities

machine-learningdata-scienceclassificationregressionrmlr3r-package

License file reads as LGPL-3.0 · 2,354 commits · Last activity 2026-09-25 · +0.4% stars, 30d · Default branch at 1.8.0.9000, ahead of CRAN 1.8.0 (checked 2026-10-11) · Discussions: 23 posts

Responsiveness

How these are sampled

PRs merged (all time): 88%
Median days to close, 50 most recently updated closed issues: 89
Median days to close, 50 most recently updated closed PRs: 1

Stars over time

2025-10-04 · 1,0232026-10-09 · 1,082

How these are measured

PracticesBeta

17 development-tooling and community-health practices detected across 6 families in the upstream repository

Checks run against github.com/mlr-org/mlr3 on 2026-10-11.

Continuous integration (2)

GitHub ActionsR CMD check workflow

The R CMD check workflow runs on Linux, and on R-devel

Governance and community (4)

Code of conductContributing guide

Funding links: GitHub Sponsors

The repository owner accepts GitHub Sponsors

Docs source (4)

README.Rmdpkgdown

GitHub Pages site last deployed 2026-09-25 · The repository has a site deploy workflow

pkgdown site last built 2026-08-21

Automation and maintenance (1)

Dependabot

Show all practicesHide 2 practices

Lint, format, editor (5)

lintrAirEditorConfigVS CodeRStudio project

Git structural (1)

blame-ignore revs

How this is detected·Detection ruleset v3 (2026-09-26)

AI coding toolsBeta

This repository shows signs of AI coding tools.

Cursorfirst seen 2025-05-16
Named in .Rbuildignore: .cursor
Claude Codefirst seen 2026-02-19
Seen in the repository: .claude, CLAUDE.md
Named in .Rbuildignore: .claude, CLAUDE.md
Named in .gitignore: .claude, CLAUDE.md
Pull request it wrote: opened by a project member
Commits: at least 28 crediting it in the message
Gemini CLIfirst seen 2026-03-17
Config: a file or ignore line, not recorded which
Codexfirst seen 2026-09-23
Seen in the repository: .codex
Named in .Rbuildignore: .codex

Shared conventions any agent may read, so they name no particular tool.

Seen in the repository: AGENTS.md

Models named in its commits

Claude Opus 4.616 commits · Mar to Apr 2026
Claude Fable 5.13 commits · Sep 2026
Claude Opus 53 commits · Aug to Sep 2026
Claude Fable 52 commits · Jun 2026
Claude Opus 4.72 commits · Apr to Jun 2026

1 more model not listed.

Counts are commits, not lines of code. Commits by a tool's accounts count once across all of its accounts. Commits crediting it are the largest count among its credit lines, a minimum.How this is detected·Detection ruleset v4 (updated 2026-09-27)

Dependencies

Declared dependencies

24 external dependencies (excludes base and recommended)

Installing mlr3 adds 23 packages (11 with compiled code, 15 MB of source tarballs). Heaviest: data.table 5.7 MB, palmerpenguins 2.9 MB, mlbench 967 KB.

Depends (1)

R >= 3.5.0

Imports (18)

R6 backports checkmate cli data.table evaluate future future.apply lgr miraimethodsmlbench mlr3measures mlr3misc parallelly palmerpenguins paradox uuid

LinkingTo (0)

none

Suggests (10)

callrcodetoolsdatasetsfuture.callr mlr3data progressr remotes RhpcBLASctlrparttestthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

45direct

7indirect

Depends 18 · Imports 27

Suggested by 21

Show the 48 most downloaded packagesHide the 48 most downloaded packages

Depends, Imports or LinkingTo, most downloaded first

Suggests, most downloaded first

VIM iml mlr3data

and 18 more packages that suggest it on CRAN ↗

How these are counted

Code & Tests

Datasets

People & History

People (17)

Marc Becker

Maintainer since 0.20.0 (2024), Author · added in 0.7.0

Martin Binder

Author

Bernd Bischl

Author

Sebastian Fischer

Author · added in 0.14.1

Michel Lang

Author

Florian Pfisterer

Author · added in 0.14.1

Jakob Richter

Author

Patrick Schratz

Author

Raphael Sonabend

Author · added in 0.14.1

Contributor

Contributor

Contributor

Contributor · added in 0.20.2

Keno Mersmann

Contributor · added in 1.7.0

Maximilian Mücke

Contributor · added in 1.2.0

Lennart Schneider

Contributor · added in 0.14.1

John Zobolas

Contributor · added in 0.23.0

Previously maintained by Michel Lang (0.1.1 to 0.19.0).

Releases (53)

Pick two releases to compare their code metrics.

1.8.0Latest
record
2026-08-21 · current release · diff ↗ ·
added 1 export
MeasureBestValidScore
1.7.1
record
2026-06-11 · diff ↗
1.7.0
record
2026-06-10 · diff ↗
R
R 4.6.0 released · 2026-04-24
1.6.0
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2026-04-02 · diff ↗
1.5.0
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2026-02-27 · diff ↗
1.4.0
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2026-02-19 · diff ↗ ·
removed 2 exports
deprecated_binding, warn_deprecated

added 2 exports
deprecated_binding_old, warn_deprecated_old
1.3.0
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2025-12-03 · diff ↗
1.2.0
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2025-09-14 · diff ↗ ·
removed 1 export
DataBackendMatrix

added 2 exports
assert_quantiles, default_fallback
1.1.0
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2025-07-30 · diff ↗ ·
added 2 exports
MeasureRegrRQR, assert_has_backend
1.0.1
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2025-07-03 · diff ↗ ·
added 1 export
TaskGeneratorPeak
1.0.0
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2025-06-18 · diff ↗ ·
added 4 exports
MeasureRegrPinball, score_roc_measures, uhash, uhashes
R
R 4.5.0 released · 2025-04-11
0.23.0
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2025-03-12 · diff ↗ ·
added 10 exports
CallbackResample, ContextResample, assert_empty_ellipsis, assert_resample_callback, assert_resample_callbacks, assert_scorable, callback_resample, clbk, clbks, mlr_callbacks
0.22.1
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2024-11-27 · diff ↗
0.22.0
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2024-11-24 · diff ↗

Show 45 earlier eventsHide 45 earlier events

0.21.1
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2024-10-18 · diff ↗
0.21.0
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2024-09-24 · diff ↗ ·
added 5 exports
MeasureRegrRSQ, create_empty_prediction_data, deprecated_binding, task_check_col_roles, warn_deprecated
0.20.2
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2024-07-29 · diff ↗
0.20.1
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2024-07-22 · diff ↗
0.20.0
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2024-06-28 · diff ↗ ·
added 3 exports
MeasureInternalValidScore, assert_validate, set_validate
0.19.0
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2024-04-24 · diff ↗ ·
added 6 exports
is_marshaled_model, learner_marshal, learner_marshaled, learner_unmarshal, marshal_model, unmarshal_model
R
R 4.4.0 released · 2024-04-24
0.18.0
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2024-03-05 · diff ↗
0.17.2
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2024-01-09 · diff ↗
0.17.1
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2023-12-21 · diff ↗
0.17.0
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2023-11-17 · diff ↗ ·
added 1 export
col_info
0.16.1
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2023-06-18 · diff ↗ ·
added 1 export
data.table
0.16.0
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2023-05-05 · diff ↗
R
R 4.3.0 released · 2023-04-21
0.15.0
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2023-03-17 · diff ↗ ·
removed 1 export
MeasureDebug

added 1 export
MeasureDebugClassif
0.14.1
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2022-11-02 · diff ↗
0.14.0
record
2022-08-11 · diff ↗ ·
added 2 exports
as_task_unsupervised, as_tasks_unsupervised
0.13.4
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2022-07-21 · diff ↗
R
R 4.2.0 released · 2022-04-22
0.13.3
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2022-03-01 · diff ↗
0.13.2
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2022-02-14 · diff ↗
0.13.1
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2022-01-19 · diff ↗
0.13.0
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2021-11-16 · diff ↗ ·
added 6 exports
HotstartStack, LearnerRegrDebug, MeasureSimilarity, extract_pkgs, filter_prediction_data, install_pkgs
0.12.0
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2021-08-05 · diff ↗ ·
added 5 exports
MeasureAIC, MeasureBIC, ResamplingCustomCV, assert_predictable, partition
R
R 4.1.0 released · 2021-05-18
0.11.0
record
2021-03-05 · diff ↗ ·
added 4 exports
as_prediction_classif, as_prediction_regr, as_predictions, set_threads
0.10.0
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2021-01-21 · diff ↗
0.9.0
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2020-12-06 · diff ↗
0.8.0
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2020-10-21 · diff ↗
0.7.0
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2020-10-07 · diff ↗ ·
added 2 exports
ResultData, as_result_data
0.6.0
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2020-09-13 · diff ↗ ·
added 8 exports
as_prediction, as_prediction_data, as_resample_result, as_task_classif, as_task_regr, check_prediction_data, convert_task, is_missing_prediction_data
0.5.0
record
2020-08-07 · diff ↗ ·
added 1 export
ResamplingLOO
0.4.0
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2020-07-22 · diff ↗ ·
added 5 exports
TaskGeneratorCassini, TaskGeneratorCircle, TaskGeneratorMoons, TaskGeneratorSimplex, TaskGeneratorSpirals
0.3.0
record
2020-06-02 · diff ↗
R
R 4.0.0 released · 2020-04-24
0.2.0
record
2020-04-17 · diff ↗ ·
added 3 exports
ResamplingInsample, TaskUnsupervised, auto_convert
0.1.8
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2020-03-10 · diff ↗
0.1.7
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2020-02-23 · diff ↗
0.1.6
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2019-12-19 · diff ↗
0.1.5
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2019-12-10 · diff ↗ ·
removed 9 exports
MeasureClassifACC, MeasureClassifAUC, MeasureClassifCE, MeasureClassifConfusion, MeasureClassifFScore, MeasureRegrMAE, MeasureRegrMSE, MeasureRegrRMSE, confusion_measures

added 1 export
assert_learnable
0.1.4
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2019-10-29 · diff ↗ ·
removed 1 export
MeasureClassifF1

added 6 exports
MeasureClassifFScore, lrns, msrs, rsmps, tgens, tsks
0.1.3
record
2019-09-18 · diff ↗ ·
removed 1 export
hash_resample_result

added 1 export
MeasureDebug
0.1.2
record
2019-08-26 · diff ↗ ·
removed 9 exports
Generator, Generator2DNormals, GeneratorFriedman1, GeneratorSmiley, GeneratorXor, cast_from_dict, expand_grid, mlr_control, mlr_generators

added 23 exports
TaskGenerator, TaskGenerator2DNormals, TaskGeneratorFriedman1, TaskGeneratorSmiley, TaskGeneratorXor, as_benchmark_result, as_learner, as_learners, as_measure, as_measures, as_resampling, as_resamplings, as_task, as_tasks, benchmark_grid, default_measures, hash_resample_result, lrn, mlr_task_generators, msr, rsmp, tgen, tsk
0.1.1
record
2019-07-25
R
R 3.6.0 released · 2019-04-26

Package metadata

First published: 2019-07-25
Total releases: 53 / 7 yrs
License: LGPL-3 OSI
Minimum R: ≥ 3.5.0
Download size: 850 KB

Appears in task views

Machine Learning & Statistical Learning Analysis of Spatial Data

Cite

Cite this package

Run in R for the authors' entry:

citation("mlr3")

The package provides a citation file, so citation() returns the authors' own entry.

It points to 10.21105/joss.01903.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for mlr3 version 1.8.0 [Data set]. HJJB, LLC. Data release v2026-10-18. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-18, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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