LensKit RecSys Toolkit
@lenskit.org
Open-source toolkit for building, researching, and learning about recommender systems. https://lenskit.org
New LensKit release today! Steam Australia dataset import, FlexMF WARP bug fix, SLIM performance improvements, and more. lenskit.org/stable/relea...
2026 Releases
2026 builds on the foundation of 2025 to improve the ergonomics of data access, querying, and metrics, and clean up some APIs that seemed good at the time, while making it even easier to use LensKi...
lenskit.org
New #LensKit #RecSys release - 2026.2.0, the first feature update for 2026. Includes rendering pipeline configurations to Mermaid for visualization & debugging! github.com/orgs/lenskit...
2026 Feature Update 1 · lenskit · Discussion #1105
This is the first feature update of the 2026 release series. Details are in the release notes. Highlights: New pipeline tooling for expanding a configuration file into a full configuration (lenskit...
github.com
Pleased to announce the first 2026 release of LensKit — the same ideas as 2025, with some training and metric interface cleanups, and improved defaults. Most of your 2025 code will work unchanged. Bug reports, questions, PRs, etc. welcome! lenskit.org/stable/relea...
2026 Releases
2026 builds on the foundation of 2025 to improve the ergonomics of data access, querying, and metrics, and clean up some APIs that seemed good at the time, while making it even easier to use LensKi...
lenskit.org
Spent some time today updating the list of #RecSys research using LensKit, and we're now at 105 known research products using LensKit for Python! lenskit.org/research/ As a friendly reminder, if you use LensKit in your research, please cite the CIKM'20 paper to help track usage.
LensKit — Research
lenskit.org
The next LensKit release will be the biggest since the switch to Python, a fundamental paradigm shift to support better flexibility, easy correctness, and self-documentation. Still working on code, testing, and docs, but a preview: lkpy.lenskit.org/en/latest/gu...
Migrating from LensKit 0.x
LensKit 2025.1 brings the largest changes to LensKit’s APIs and operation since moving to Python. These changes are a result of years of experience using and teaching the current Python APIs, talki...
lkpy.lenskit.org