isotree

0.6.1-5

Isolation-Based Outlier Detection

9packages depend

25.4Kdownloads / year

–test coverage

13/13checks pass

Overview

About

Maintained by David CortesFirst published 2019-12-1829 releasesCRAN page ↗GitHub ↗

Fast and multi-threaded implementation of isolation forest (Liu, Ting, Zhou (2008) doi:10.1109/ICDM.2008.17), extended isolation forest (Hariri, Kind, Brunner (2018) doi:10.48550/arXiv.1811.02141), SCiForest (Liu, Ting, Zhou (2010) doi:10.1007/978-3-642-15883-4_18), fair-cut forest (Cortes (2021) doi:10.48550/arXiv.2110.13402), robust random-cut forest (Guha, Mishra, Roy, Schrijvers (2016) http://proceedings.mlr.press/v48/guha16.html), and customizable variations of them, for isolation-based outlier detection, clustered outlier detection, distance or similarity approximation (Cortes (2019) doi:10.48550/arXiv.1910.12362), isolation kernel calculation (Ting, Zhu, Zhou (2018) doi:10.1145/3219819.3219990), and imputation of missing values (Cortes (2019) doi:10.48550/arXiv.1911.06646), based on random or guided decision tree splitting, and providing different metrics for scoring anomalies based on isolation depth or density (Cortes (2021) doi:10.48550/arXiv.2111.11639). Provides simple heuristics for fitting the model to categorical columns and handling missing data, and offers options for varying between random and guided splits, and for using different splitting criteria.

Install

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

install.packages("isotree", 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("david-cortes/isotree")

Development version from david-cortes/isotree. 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-isotree

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

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-isotree

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-isotree

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

13OK

Slowest check: 4.2 min · r-oldrel-windows-x86_64

Code health

None

Tests · ratio 0.00

not tracked

Coverage

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-04-25
12 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
NOTE2026-04-22
12 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-18
11 OK · 2 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
NOTE2026-03-10
12 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesYes · dynamicpkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 83%
Documented parameters: 91%
Return-value docs: 100%
References docs: 4%

Downloads

25.4K

CRAN downloads in the past year

Rank #2,607 · ~70/day · ~2.1K/mo

Releases R versions

Daily download trend is not available in this view yet.

2.1K30 days

8.2K90 days

25.4K1 year

Compare downloads with other packages →

Also on551 r2u25 autocran4.1K conda_forge55 c2d4u

Repository

GitHub ↗ david-cortes/isotree

230Stars

40Forks

1Open issues

0Open PRs

0Releases

582Commits

8Contributors

isolation-forestoutlier-detectionanomaly-detectionimputation

License BSD-2-Clause · 582 commits · Last activity 2026-06-21 · +0.4% stars, 30d

Stars over time

2025-07-07 · 2152026-07-07 · 229

Repository practices

Upstream repositoryBeta

2 development-tooling and community-health practices detected across 1 family in the upstream repository

Checks run against github.com/david-cortes/isotree on 2026-07-19.

Git structural (2)

.gitattributesSubmodules

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

12 external dependencies (excludes base and recommended)

Depends (1)

R >= 4.3.0

Imports (4)

Rcpp jsonlite RhpcBLASctlmethods

LinkingTo (1)

Rcpp

Suggests (9)

MASSoutliertree DiagrammeR mlbench MLmetrics kernlab knitr rmarkdown kableExtra

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

9direct

0indirect

bulkQC autoFlagR ifCNVR quickOutlier rarefun reverseR rrobot applicable familiar

Code & Tests

Code Composition

C 29,623 (61%)C++ 11,217 (23%)R 4,520 (9%)Rd 2,501 (5%)Vignettes 592 (1%)

Code characteristics

Object systems

S36

Cyclomatic complexity: 1.0 median / 115 max

Test coverage

Line coverage

–

Expression

–

Tests / Examples

–

Functions

688 23 exported

Complexity

5.7 avg / 115 max

Call network

688 nodes / 644 edges

Call graph

Open call graph →

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Lowest coverage

Per-function coverage is not measured for this package yet.

People & History

People (8)

Maintainer (1)

David Cortes

Author, Maintainer, Copyright holder

Authors (1)

David Cortes

Author, Maintainer, Copyright holder

David Cortes

Author, Maintainer, Copyright holder

David Blackman

NumPy Developers

SciPy Developers

Thibaut Goetghebuer-Planchon

Enthought Inc

Stephen Moshier

Sebastiano Vigna

Package Timeline

29 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
0.6.1-5Latest
2026-03-05 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
0.6.1-4
2025-01-08 · diff ↗
R
R 4.4.0 released · 2024-04-24
0.6.1-1
2024-03-27 · diff ↗
0.5.24-3
2023-12-02 · diff ↗
0.5.24-2
2023-12-01 · diff ↗
0.5.24-1
2023-11-28 · diff ↗
0.5.24
2023-11-19 · diff ↗
0.5.22
2023-08-07 · diff ↗
0.5.20
2023-05-23 · diff ↗
R
R 4.3.0 released · 2023-04-21
0.5.19-1
2023-03-16 · diff ↗
0.5.17
2022-09-07 · diff ↗
0.5.16
2022-08-06 · diff ↗

Show 21 earlier events

R
R 4.2.0 released · 2022-04-22
0.5.15
2022-03-31 · diff ↗
0.5.14
2022-02-13 · diff ↗
0.5.5
2022-01-11 · diff ↗
0.3.9
2021-10-23 · diff ↗
0.3.0
2021-08-22 · diff ↗
0.2.10
2021-07-17 · diff ↗
0.2.8
2021-07-11 · diff ↗
R
R 4.1.0 released · 2021-05-18
0.2.7
2021-03-01 · diff ↗
0.1.28
2021-01-13 · diff ↗
0.1.24
2020-12-10 · diff ↗
0.1.20
2020-10-14 · diff ↗
0.1.19
2020-10-11 · diff ↗
0.1.18
2020-07-29 · diff ↗
0.1.17
2020-07-20 · diff ↗
0.1.11
2020-04-27 · diff ↗
R
R 4.0.0 released · 2020-04-24
0.1.8
2020-01-08 · diff ↗
0.1.5
2019-12-18
R
R 3.6.0 released · 2019-04-26

Package metadata

First published: 2019-12-18
Total releases: 29 / 7 yrs
License: BSD_2_clause + file LICENSE OSI
Minimum R: ≥ 4.3.0
Download size: 1.1 MB
Installed size: not tracked yet
With dependencies: not tracked yet

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