---
language:
- en
pretty_name: Lean 4 Changelog Dataset
tags:
- theorem-proving
- formal-methods
- lean4
- changelog
- version-control
license: apache-2.0
task_categories:
- text-generation
- feature-extraction
- other
---

# Lean 4 Changelog Dataset

## Dataset Description

The Lean 4 Changelog Dataset provides structured, machine-readable entries for changes in Lean 4, including language and library updates, fixes, deprecations, and other modifications. This dataset focuses on release notes from Lean 4’s official changelogs, capturing the key updates that are most likely to impact users, developers, or researchers working with Lean 4.

By offering structured data for these changes, this dataset enables tooling and machine learning workflows that analyze Lean 4’s evolution, assist in migration between versions, or build question-answering systems for Lean-specific features.

### Dataset Structure

The dataset includes the following fields:
- **version**: The Lean 4 version associated with the change (e.g., "v4.16.0").
- **section**: The section of the changelog where the change appears (e.g., "## Language," "## Libraries").
- **text**: The content of the change
- **pull request**: The associated pull request.

### Example Row

- version: "v4.16.0"
- section: "## Language"
- title: "#6204"
- description: "Lets _ be used in numeric literals as a separator, e.g., 1_000_000."

### Source Code

The dataset was created by processing the official Lean 4 changelogs to extract and structure their content into individual, machine-readable entries. While the changelogs cover Lean 4's development comprehensively, this dataset focuses on capturing actionable updates for users and researchers. References to GitHub pull requests (e.g., "#6204") are included in the title field, while the description field provides a clean, detailed summary of the update.

### Usage

This dataset is designed for:
- **Formal Methods Research**: Understanding the evolution of Lean 4 features and their impact on theorem proving.
- **Machine Learning Applications**: Training models for Lean 4 version prediction, changelog summarization, or migration tool development.
- **Educational Purposes**: Teaching Lean 4 users about recent changes or deprecated features in new releases.

### License

This dataset is distributed under the Apache 2.0 license, aligning with the licensing of the Lean 4 project.

### Acknowledgments

- **Official Lean 4 Repository**: https://github.com/leanprover/lean4  
- **Dataset Maintainer**: phanerozoic (Charles Norton)
- **Inspired by**: Andreas Florath's Facts, Propositions, and Proofs Dataset