PolyCI

PolyCI is a cross-service, cross-language, longitudinal dataset of continuous integration (CI) use in open-source software. It contains 135,189 repositories adopting one or more of eight CI services (GitHub Actions, Travis CI, CircleCI, GitLab CI, AppVeyor, Azure Pipelines, Bitbucket Pipelines, Cirrus CI), across seven languages (C, C++, Go, Java, Python, Ruby, Rust), from 2008 to 2025. Every table is keyed by the GitHub repo_name (owner/repo), so project, service, and commit levels join directly.

Each data type below merges its per-language source files into a single parquet carrying a lowercase language column that identifies the source language. The one exception is REPO_COMMIT_DETAILS (167 M rows): it is split into one parquet per language to keep every file relatively small, and each file keeps the same language column.

Tables

Config (config_name)	Grain	What it holds
CI_SERVICES	one row per CI-using repo	which CI services a repo declares, a per-service presence flag, and the service count
EXISTENCE_CHECK	repo x service	whether each declared CI configuration still_exists (basis for abandonment)
YML_STATS	repo x service	number of workflow/config YAML files and total YAML lines
REPO_DETAILS	one row per repo	GitHub metadata: stars, forks, size, timestamps, license, topics, description
REPO_METRICS	one row per repo	commit, pull-request, issue, and contributor counts
CI_REPO_CONTRIBUTORS	repo x contributor	contributor login, account type, and contribution count
COMMITS_PER_CI_FILES	commit that edits a CI file	commit and parent SHA, message, author/committer, dates for every commit touching a CI configuration file
REPO_COMMIT_DETAILS	commit	the full commit history of each repo (SHA, parent SHA, message, author/committer, dates)
EXPLANATORY_CI_COMMITS	commit	CI commit messages annotated with multi_ci and abandoned flags

Loading

from datasets import load_dataset

ci = load_dataset("taher-ghaleb/PolyCI", "CI_SERVICES", split="train")

Or read a single table directly with pandas / DuckDB:

import duckdb
duckdb.sql("SELECT language, count(*) FROM 'data/CI_SERVICES.parquet' GROUP BY 1")

Scope and known boundaries

• Detection is path-based: a table records a declared CI configuration, not executed builds. A configuration still present is not proof it still runs, so the abandonment signal is a lower bound.
• COMMITS_PER_CI_FILES and REPO_COMMIT_DETAILS give commit and parent SHAs and messages, but not the list of files changed per commit, and there is no pull-request identifier. Studies that need same-commit file co-change or PR-level grouping resolve the provided SHAs to file lists (GitHub API or a local clone) and map commits to PRs themselves.
• The dataset excludes private repositories, forks, and projects below five stars. It generalizes to visible, active open-source development, not to GitHub as a whole (see Kalliamvakou et al., 2016, on the perils of mining GitHub).
• Commit records include author and committer names and emails as they appear in public git history. Do not use these fields to identify or contact individuals.

Citation

@misc{polyci2027ghaleb,
  title  = {PolyCI: A Large-Scale Longitudinal Multi-Service Dataset of Continuous Integration Adoption},
  author = {Ghaleb, Taher A.},
  year   = {2026},
  howpublished = {\url{https://huggingface.co/datasets/taher-ghaleb/PolyCI}}
}