COR Brief
Code & Development

Scikit-Lego

Scikit-Lego is an open-source Python package that extends the scikit-learn ecosystem by providing additional custom transformers, metrics, and models compatible with scikit-learn pipelines. It allows users to integrate these components seamlessly alongside standard scikit-learn tools, facilitating the construction of more diverse machine learning pipelines without the need to implement these components from scratch. The project is maintained collaboratively by multiple companies in the Netherlands and adheres to code quality and testing standards aligned with scikit-learn guidelines. Scikit-Lego is freely available and can be installed via pip or conda.

Updated Feb 12, 2026open-source

An open-source Python package offering scikit-learn compatible custom transformers, metrics, and models for enhanced machine learning pipelines.

Pricing
open-source
Category
Code & Development
Company
Interactive PresentationOpen Fullscreen ↗
01
Provides scikit-learn compatible custom transformers such as RandomAdder that can be integrated into pipelines.
02
Supports combining custom components with standard scikit-learn tools like StandardScaler and LogisticRegression within a single pipeline.
03
Available for installation via pip, conda-forge, and editable development mode for contributors.
04
Adheres to scikit-learn code quality and testing standards, with verified releases signed by commit signatures.

Enhancing Machine Learning Pipelines

Data scientists using scikit-learn who require additional transformers or metrics not included in the core library can incorporate Scikit-Lego components to extend pipeline functionality.

1
Install Scikit-Lego
Run pip install scikit-lego or conda install -c conda-forge scikit-lego to install the package.
2
Import Components
Import desired transformers or models, for example: from sklego.transformers import RandomAdder.
3
Build Pipeline
Combine Scikit-Lego components with scikit-learn tools in a pipeline, e.g., Pipeline([('scale', StandardScaler()), ('random_noise', RandomAdder()), ('model', LogisticRegression())]).
4
Fit and Use Pipeline
Fit the pipeline on your data and use it for predictions or transformations as needed.
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Pricing
Model: open-source

Scikit-Lego is free and open-source with no paid plans.

Assessment
Strengths
  • Scikit-learn compatible for seamless integration into existing pipelines.
  • Consolidates tested custom components, reducing the need for users to implement them individually.
  • Multiple installation methods including pip, conda, and editable development mode.
  • Actively maintained with 45 releases and contributions from 67 developers.
  • Open-source with verified signed releases ensuring code integrity.
Limitations
  • No formal affiliation with the scikit-learn project; compatibility depends on adherence to scikit-learn standards.
  • Limited to providing additional pipeline components and does not replace core scikit-learn functionality.