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What is CML? Continuous Machine Learning (CML) is an open-source CLI tool for implementing continuous integration & delivery (CI/CD) with a focus on MLOps. Use it to automate development workflows — including machine provisioning, model training and evaluation, comparing ML experiments across project history, and monitoring changing datasets.

CML can help train and evaluate models — and then generate a visual report with results and metrics — automatically on every pull request.

An example report for a neural style transfer model.

CML principles:

• GitFlow for data science. Use GitLab or GitHub to manage ML experiments, track who trained ML models or modified data and when. Codify data and models with DVC instead of pushing to a Git repo.
• Auto reports for ML experiments. Auto-generate reports with metrics and plots in each Git pull request. Rigorous engineering practices help your team make informed, data-driven decisions.
• No additional services. Build your own ML platform using GitLab, Bitbucket, or GitHub. Optionally, use cloud storage as well as either self-hosted or cloud runners (such as AWS EC2 or Azure). No databases, services or complex setup needed.

❓ Need help? Just want to chat about continuous integration for ML? Visit our Discord channel!

⏯️ Check out our YouTube video series for hands-on MLOps tutorials using CML!

Table of Contents

1. Setup (GitLab, GitHub, Bitbucket)
2. Usage
3. Getting started (tutorial)
4. Using CML with DVC
5. Advanced Setup (Self-hosted, local package)
6. Example projects

Setup

You'll need a GitLab, GitHub, or Bitbucket account to begin. Users may wish to familiarize themselves with Github Actions or GitLab CI/CD. Here, will discuss the GitHub use case.

GitLab

Please see our docs on CML with GitLab CI/CD and in particular the personal access token requirement.

Bitbucket

Please see our docs on CML with Bitbucket Cloud.

GitHub

The key file in any CML project is .github/workflows/cml.yaml:

name: your-workflow-name
on: [push]
jobs:
  run:
    runs-on: ubuntu-latest
    # optionally use a convenient Ubuntu LTS + DVC + CML image
    # container: docker://ghcr.io/iterative/cml:0-dvc2-base1
    steps:
      - uses: actions/checkout@v2
      # may need to setup NodeJS & Python3 on e.g. self-hosted
      # - uses: actions/setup-node@v2
      #   with:
      #     node-version: '16'
      # - uses: actions/setup-python@v2
      #   with:
      #     python-version: '3.x'
      - uses: iterative/setup-cml@v1
      - name: Train model
        run: |
          # Your ML workflow goes here
          pip install -r requirements.txt
          python train.py
      - name: Write CML report
        env:
          REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Post reports as comments in GitHub PRs
          cat results.txt >> report.md
          cml send-comment report.md

Usage

We helpfully provide CML and other useful libraries pre-installed on our custom Docker images. In the above example, uncommenting the field container: docker://ghcr.io/iterative/cml:0-dvc2-base1) will make the runner pull the CML Docker image. The image already has NodeJS, Python 3, DVC and CML set up on an Ubuntu LTS base for convenience.

CML Functions

CML provides a number of functions to help package the outputs of ML workflows (including numeric data and visualizations about model performance) into a CML report.

Below is a table of CML functions for writing markdown reports and delivering those reports to your CI system.

CML Reports

The cml send-comment command can be used to post reports. CML reports are written in markdown (GitHub, GitLab, or Bitbucket flavors). That means they can contain images, tables, formatted text, HTML blocks, code snippets and more — really, what you put in a CML report is up to you. Some examples: