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Announcing Livebook

  * Jose Valim
  * April 13th, 2021
  * nx, axon, exla, livebook

Livebook

We are glad to announce Livebook, an open source web application for
writing interactive and collaborative code notebooks in Elixir and
implemented with Phoenix LiveView. Livebook is an important step in
our journey to enable the Erlang VM and its ecosystem to be suitable
for numerical and scientific computing.

I have recorded a screencast that highlights some Livebook features,
which you can watch below. It also showcases the Axon library, for
building Neural Networks in Elixir, as well as some improvements
coming in Elixir v1.12:

Livebook is a Dashbit project developed by Jonatan Klosko, with
contributions from myself, Jon Klein, Chris McCord, and designed by
Aakash Raj Dahal. We are glad to have an open source example of a
complex LiveView application out in the wild and we hope you enjoy
using it!

Features

If you can't yet watch the video, here is a summary of Livebook
features:

  * A deployable web app built with Phoenix LiveView where users can
    create, fork, and run multiple notebooks.

  * Each notebook is made of multiple sections: each section is made
    of Markdown and Elixir cells. Code in Elixir cells can be
    evaluated on demand. Mathematical formulas are also supported via
    KaTeX.

  * Persistence: notebooks can be persisted to disk through the
    .livemd format, which is a subset of Markdown. This means your
    notebooks can be saved for later, easily shared, and they also
    play well with version control.

  * Sequential evaluation: code cells run in a specific order,
    guaranteeing future users of the same Livebook see the same
    output. If you re-execute a previous cell, following cells are
    marked as stale to make it clear they depend on outdated notebook
    state.

  * Custom runtimes: when executing Elixir code, you can either start
    a fresh Elixir process, connect to an existing node, or run it
    inside an existing Elixir project, with access to all of its
    modules and dependencies. This means Livebook can be a great tool
    to provide live documentation for existing projects.

  * Explicit dependencies: if your notebook has dependencies, they
    are explicitly listed and installed with the help of the
    Mix.install/2 command in Elixir v1.12+.

  * Collaborative features allow multiple users to work on the same
    notebook at once. Collaboration works either in single-node or
    multi-node deployments - without a need for additional tooling.

Here is a peek at the "Welcome to Livebook" introductory notebook:

Livebook

This announcement provides only the initial step of our Livebook
vision. Our plan is to continue focusing on visual, collaborative,
and interactive features in the upcoming releases.

Happy coding!

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