isotree.subset.trees

Creates a new isolation forest model containing only selected trees of a
given isolation forest model object.

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) <arXiv:1811.02141>),
SCiForest (Liu, Ting, Zhou (2010) <doi:10.1007/978-3-642-15883-4_18>),
fair-cut forest (Cortes (2021) <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) <arXiv:1910.12362>),
isolation kernel calculation (Ting, Zhu, Zhou (2018) <doi:10.1145/3219819.3219990>),
and imputation of missing values (Cortes (2019) <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) <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.

David Cortes

isotree

Isolation-Based Outlier Detection

Thibaut Goetghebuer-Planchon

David Blackman

Sebastiano Vigna

NumPy Developers

isotree.subset.trees function

<dl><dt>model</dt>
<dd>An `isolation_forest` model object.</dd>
<dt>trees_take</dt>
<dd>Indices of the trees of `model` to copy over to a new model,
as an integer vector.
Must be integers with numeration starting at one</dd></dl>

Arguments

Subset trees of a given model — isotree.subset.trees

<dl>

<dt>model</dt>
<dd>An `isolation_forest` model object.</dd>


<dt>trees_take</dt>
<dd>Indices of the trees of `model` to copy over to a new model,
as an integer vector.
Must be integers with numeration starting at one</dd>

</dl>

isotree.subset.trees: Subset trees of a given model

Description

Usage

Value

Arguments