CI workflow (CamDavidsonPilon/lifelines)

The CI workflow from CamDavidsonPilon/lifelines, explained and optimized by Latchkey.

What it does

This is the CI workflow from the CamDavidsonPilon/lifelines repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

name: CI

on:
  pull_request:
  push:
    branches:
      - master
  workflow_dispatch:

jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: ["ubuntu-latest"]
        python-version: ["3.11", "3.12", "3.13", "3.14"]
        numpy-version: ["2.2.6", "2.3.5", "2.4.2"]
        exclude:
          - python-version: "3.14"
            numpy-version: "2.2.6"

    steps:
      - name: Checkout source
        uses: actions/checkout@v6

      - name: Setup python
        uses: actions/setup-python@v6
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install
        run: |
          pip install "numpy==${{ matrix.numpy-version }}"
          pip install -e .
          pip install -r reqs/dev-requirements.txt

      - name: Run tests
        run: pytest lifelines/tests/ -vv

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: CI
 
on:
  pull_request:
  push:
    branches:
      - master
  workflow_dispatch:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: ["ubuntu-latest"]
        python-version: ["3.11", "3.12", "3.13", "3.14"]
        numpy-version: ["2.2.6", "2.3.5", "2.4.2"]
        exclude:
          - python-version: "3.14"
            numpy-version: "2.2.6"
 
    steps:
      - name: Checkout source
        uses: actions/checkout@v6
 
      - name: Setup python
        uses: actions/setup-python@v6
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
 
      - name: Install
        run: |
          pip install "numpy==${{ matrix.numpy-version }}"
          pip install -e .
          pip install -r reqs/dev-requirements.txt
 
      - name: Run tests
        run: pytest lifelines/tests/ -vv
 

What changed

• Cancel superseded runs when a branch or PR gets a newer push.
• Cache dependency installs on the setup step so they are served from cache.
• Add a job timeout so a hung step cannot burn hours of runner time.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

• Dependency installs

This workflow runs 1 job (12 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow