2025 Feature Update

[mdekstrand]

A few small feature updates for LensKit 2025.

What's Changed

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

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

---

This discussion was created from the release 2025 Feature Update.