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Thanks a lot for your interest in contributing to Leon! 鉂わ笍

Leon needs open source to live, the more skills he has, the more skillful he becomes.

Before submitting your contribution, please take a moment to review this document.

Please note we have a code of conduct, please follow it in all your interactions with the project.

How You Can Help

Here are few examples about how you could help on Leon, by:

Pull Requests

Working on your first Pull Request? You can learn how from this free series How to Contribute to an Open Source Project on GitHub.

  • Please first discuss the change you wish to make via issue, email, or any other method with the owners of this repository before making a change. It might avoid a waste of your time.

  • The master branch is actually used as a snapshot of the latest stable release. Do not submit your PRs against the master branch.

  • Ensure your code respect our coding standards (cf. .eslintrc.json). To do so, you can run:

    npm run lint
  • Make sure your code passes the tests. You can run the tests via the following command:

    npm test

    If you're adding new features to Leon, please include tests.

Development Setup

Choose the setup method you want to go for.


Gitpod will automatically set up an environment and run an instance for you.

Open in Gitpod


# Clone the repository
git clone leon

# Go to the project root
cd leon

# Install
npm install

# Check the setup went well
npm run check

# Run the development server
npm run dev:server

# Run the development web app
npm run dev:app



The commit message guideline is adapted from the AngularJS Git Commit Guidelines.


Types define which kind of changes you made to the project.

Types Description
BREAKING Changes including breaking changes.
build New build version.
chore Changes to the build process or auxiliary tools such as changelog generation. No production code change.
ci Changes related to continuous integration only (GitHub Actions, CircleCI, etc.).
docs Documentation only changes.
feat A new feature.
fix A bug fix.
perf A code change that improves performance.
refactor A code change that neither fixes a bug nor adds a feature.
style Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.).
test Adding missing or correcting existing tests.


Scopes define high-level nodes of Leon.

  • bridge/python
  • bridge/nodejs
  • hotword
  • scripts
  • server
  • tcp server
  • web app
  • skill/skill_name


git commit -m "feat(server): awesome new server feature"
git commit -m "docs(skill/leon): fix spelling"
git commit -m "chore: split training script into awesome blocks"
git commit -m "style(web app): remove chatbot useless parentheses"


You can also contribute by sponsoring Leon.

Please note that I dedicate most of my free time to Leon.

By sponsoring the project you make the project sustainable and faster to develop features.

The focus is not only limited to the activity you see on GitHub but also a lot of thinking about the direction of the project. Which is naturally related to the overall design, architecture, vision, learning process and so on...

Contributing to the Python Bridge or TCP HttpServer

Leon makes use of two binaries, the Python bridge and the TCP server. These binaries are compiled from Python sources.

The Python bridge is used to communicate between the core and skills made with Python.

The TCP server is used to communicate between the core and third-party nodes, such as spaCy.

Set Up the Python Environment

To contribute to these parts, you need to set up a Python environment running with a specific Python version and a specific Pipenv version.

It is recommended to use Pyenv to manage your Python versions.

If you are on GNU/Linux Ubuntu, you can run the following to install Pyenv, otherwise, please refer to the Pyenv documentation to install it:

# Update registry
sudo apt-get update

# Install Pyenv deps
sudo apt-get install make build-essential libssl-dev zlib1g-dev \
libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \
libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev

# Install Pyenv
curl | bash

# Add output lines to .bashrc

# Restart shell
exec "$SHELL"

Once Pyenv installed, run:

# Install Python
pyenv install 3.9.10 --force
pyenv global 3.9.10

# Install Pipenv
pip install pipenv==2022.7.24

Your Python environment should be ready now. So now you can set up the respective environments according to what you are going to contribute to and build them:

# Set up the Python bridge environment
npm run setup:python-bridge

# Set up the TCP server environment
npm run setup:tcp-server
# If you are in China, you can run this to download models faster:
npm run setup:tcp-server cn

# Once your code changes are done, you can build via:

# Build the Python bridge
npm run build:python-bridge

# Build the TCP server
npm run build:tcp-server

# Run the Python bridge
./bridges/python/dist/{OS-CPU_ARCH}/leon-python-bridge server/src/intent-object.sample.json

# Run the TCP server
./tcp_server/dist/{OS-CPU_ARCH}/leon-tcp-server en

Spread the Word

Use #LeonAI if you tweet about Leon and/or mention @grenlouis.