How to Contribute

We welcome contributions to WebDNN. This document describes the procedures and rules.

Kinds of contributions will be one of the following, but not restricted to:

  • New bug reporting
  • New feature proposal
  • Bug fix
  • Implementation of a layer
  • Implementation of a converter from a deep learning framework
  • Improvement of performance
  • Documantation

For new layer implementation, at least WebAssembly backend implementation is required. WebGPU backend can only be tested on Mac, so it is not mandatory.

Open New Issue

Feel free to create open new issue, for example:

  • New bug report
  • Ask question
  • Feature proposal/request

If you found a bug, please report with execution environment information such as python interpreter version, DNN framework version, browser version, OS version, GPU version, and so on.

Send Pull Request

Please send pull request from your fork branch to our master branch. The project organizer checks the request and accepts or gives request for revision.


If you have added some features, implementing tests corresponding to them is recommended. WebDNN uses nose test framework. All tests of WebDNN is in /test. There are many examples. Please check them.

Compile-Time Test

/test/webdnn_test directory contains compile-time graph transpiler tests. All tests is done only in python code.

You can run compile-time test like follows:

$ nosetests

nosetests command traverse directories whose name contains “test” recursively, therefore you simply hit above command. If you want to create new tests, please create directory and files based on this suffix rule.

Runtime Test

/test/runtime directory contains runtime graph transpiler test. Test code is compiled by transpiler and run on web browsers.

To run runtime test, you need to generate test codes first. All test codes are generated under /build/test directory.

# generate test codes
$ nosetests test/runtime

Then, access /test/test_kernel.html and click RUN button. Result are output in debug console.

Generating all test codes requires more than 10 minutes. Instead of that, you can specify target test files like follows:

# generate test code only for AveragePooling2D
$ nosetests test/runtime/operators_test/

Also you can specify target backends. For example, follow command generates test code of only webgpu backend.

# generate test code only for WebGPU backend


WebDNN is distributed under the MIT License. Every contributor holds the copyright of his/her part.

By contributing to the mil-tokyo/webdnn repository through pull-request, comment, or otherwise, the contributor releases their content to the license and copyright terms herein.

Developer Certificate of Origin 1.1

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.