Tests workflow (dgasmith/opt_einsum)

The Tests workflow from dgasmith/opt_einsum, explained and optimized by Latchkey.

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Source: dgasmith/opt_einsum.github/workflows/Tests.ymlLicense MITView source

What it does

This is the Tests workflow from the dgasmith/opt_einsum 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

workflow (.yml)

name: Tests

on:
  push:
    branches: main
  pull_request:
    branches: main

jobs:
  tests:
    name: ${{ matrix.extras }}${{ matrix.python-extras && format('+{0}', matrix.python-extras) || '' }} / py${{ matrix.python-version }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - python-version: "3.12"
            extras: "test,lint"
          - python-version: "3.14"
            extras: "test,lint"
          - python-version: "3.12"
            extras: "test,lint,numpy"
          - python-version: "3.12"
            extras: "test,lint,numpy,dask"
          - python-version: "3.13"
            extras: "test,lint,numpy,dask,jax,sparse"
          - python-version: "3.13"
            extras: "test,lint,torch"
          # - python-version: "3.12"
          #   extras: "test,lint"
          #   python-extras: "tensorflow"

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v4

    - uses: astral-sh/setup-uv@v5
      with:
        python-version: ${{ matrix.python-version }}
        enable-cache: true

    - name: Install
      run: uv pip install -e ".[${{ matrix.extras }}]" ${{ matrix.python-extras }}

    - name: Test
      run: uv run --no-sync pytest -v --cov=opt_einsum/ --cov-report=xml

    - name: Coverage
      run: uv run --no-sync coverage report

    - uses: codecov/codecov-action@v4
      with:
        token: ${{ secrets.CODECOV_TOKEN }}
        files: ./coverage.xml

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Tests
 
on:
  push:
    branches: main
  pull_request:
    branches: main
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  tests:
    timeout-minutes: 30
    name: ${{ matrix.extras }}${{ matrix.python-extras && format('+{0}', matrix.python-extras) || '' }} / py${{ matrix.python-version }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - python-version: "3.12"
            extras: "test,lint"
          - python-version: "3.14"
            extras: "test,lint"
          - python-version: "3.12"
            extras: "test,lint,numpy"
          - python-version: "3.12"
            extras: "test,lint,numpy,dask"
          - python-version: "3.13"
            extras: "test,lint,numpy,dask,jax,sparse"
          - python-version: "3.13"
            extras: "test,lint,torch"
          # - python-version: "3.12"
          #   extras: "test,lint"
          #   python-extras: "tensorflow"
 
    runs-on: latchkey-small
 
    steps:
    - uses: actions/checkout@v4
 
    - uses: astral-sh/setup-uv@v5
      with:
        python-version: ${{ matrix.python-version }}
        enable-cache: true
 
    - name: Install
      run: uv pip install -e ".[${{ matrix.extras }}]" ${{ matrix.python-extras }}
 
    - name: Test
      run: uv run --no-sync pytest -v --cov=opt_einsum/ --cov-report=xml
 
    - name: Coverage
      run: uv run --no-sync coverage report
 
    - uses: codecov/codecov-action@v4
      with:
        token: ${{ secrets.CODECOV_TOKEN }}
        files: ./coverage.xml

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.
Add a job timeout so a hung step cannot burn hours of runner time.

2 third-party actions are referenced by a movable tag. Pin them to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

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 per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout astral-sh/setup-uv codecov/codecov-action