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Ruby binding for Menoh DNN inference library
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Menoh Ruby Extension

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This is a Ruby extension of Menoh; an ONNX runtime engine developed by @okdshin and their team @pfnet-research.


You need ruby-dev, bundler, rake-compiler to install this extension.

$ sudo apt install ruby-dev
$ sudo gem install bundler
$ sudo gem install rake-compiler

And add this line to your application's Gemfile:

gem 'menoh'

And then execute:

$ bundle

Or install it yourself as:

$ gem install menoh


Please see Menoh tutorial and menoh-ruby tutorial. And we have some examples on this repository.


After checking out the repo, run bin/setup to install ruby dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


You can develop on docker. For details, please refer to Dockerfile.

$ export IMAGE_VERSION=0.0.0 # please specify version
$ sudo -E docker build -t menoh-ruby:$IMAGE_VERSION `pwd`
$ sudo -E docker run -it --name menoh-ruby-test -v $(pwd):/opt/menoh-ruby --entrypoint /bin/bash menoh-ruby:$IMAGE_VERSIONcd /opt/menoh-ruby
$ rake && rake install

attach after stop

sudo docker start menoh-ruby-test bash
sudo docker attach menoh-ruby-test


You can also set up the development environment by using Vagrant. The details are available on Vagrantfile.

$ vagrant up
$ vagrant ssh
$ cd /vagrant


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Menoh Ruby project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

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