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User Guide
API Reference
Release Notes
Research
Indices

GitHub
Mastodon
BlueSky

Section Navigation

Preliminaries

Installing LensKit
Getting Started
Examples
Migrating from LensKit 0.x

Fundamentals

Design Goals and Principles
Queries and Operations
Recommendation Pipelines

Data

Datasets
Data Model
Item Lists and Collections
Standard Datasets
- MovieLens Data
- Amazon Data

Components and Models

Component Conventions
Scoring Models
Flexible Matrix Factorization
Ranking Algorithms
Other Components
Implementing Components

Experiments

Splitting Data
Batch-Running Pipelines
Evaluating Recommender Output
- Evaluating Top-N Rankings
- Evaluating Rating Predictions
Collecting and Aggregating Metrics
Documenting Experiments

Utilities and Diagnostics

Logging and Progress Reporting
LensKit Diagnostics
- LensKit Warnings
Parallel Processing
LensKit CLI

User Guide
LensKit Diagnostics

LensKit Diagnostics#

LensKit Warnings

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LensKit version 2026.1.0.

This material is partially based upon work supported by the National Science Foundation under Grant Nos. 17-51278 and 24-15042. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation, Drexel University, or Boise State University.