2025 Feature Update

A few small feature updates for LensKit 2025.

What's Changed

• Support auto-detecting key columns in ItemListCollection.from_df by @mdekstrand in #659
• Support dataframe-format test data for batch recommendation by @mdekstrand in #660
• Add PipelineCache to allow pipeline builders to cache component instances by @mdekstrand in #661
• Only warn once for users with missing test items in analysis by @mdekstrand in #664

Full Changelog: v2025.1.1...v2025.2.0

LensKit 2025

This is the first release in the new LensKit series, 2025.1.1!

LensKit 2025.1.1 brings a new design to LensKit, with a new generation of APIs that will enable better future flexibility and capability, and make it a lot easier to see the various software capabilities. It will also be easier to add new capabilities, such as content-based and knowledge-based recommenders.

We have plans for a lot of great new things on top of this new foundation, but code written for LensKit 0.14 and earlier will need to be udpated. See the migration guide for details.

Better logging

Improved logging and metrics — almost there!

What's Changed

• Add meaningful error on duplicate metrics by @mdekstrand in #653
• Fix logic for monitors in nested workers by @mdekstrand in #654

Full Changelog: v2025.1.1rc4...v2025.1.1rc5

Move around util and clean up

Not super happy with this being in an RC series, but this removes some old util code, keeping a deprecated shim for a bit, and adds the lenskit doctor command, along with multiple negatives in negative sampling.

Fix ItemList.from_arrow

This fixes a bug in ItemList.from_arrow when a column has null values.

CLI plugins for testing

Quick update to refactor CLI into a plugin-based design so one of the client projects can add new CLI commands.

First release candidate

We're about ready for 2025.1.1! Just need some final compatibility checks in downstreams.

Monopackage, API, docs

What's Changed

• Rename RunAnalysis.compute to .measure by @mdekstrand in #637
• Refactor and document dataset classes by @mdekstrand in #638
• Make LensKit a single package again by @mdekstrand in #640
• Add CLI tests and fix name of ml-latest-small by @mdekstrand in #641
• Add Pipeline.modify to create modified copies of pipelines by @mdekstrand in #643
• Improve pipeline modification and documentation by @mdekstrand in #644

Full Changelog: v2025.1.1b11...v2025.1.1b12

Much better logging

This provides better logging output, and fixes a small documentation error.

Data bug + RBP default

This changes the RBP default to 0.85, and fixes a data set bug. Also introduces experimental Ray support.