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Open Neural Network Exchange (ONNX) is the first step toward an open ecosystem that empowers AI developers to choose the right tools as their project evolves. ONNX provides an open source format for AI models. It defines an extensible computation graph model, as well as definitions of built-in operators and standard data types. Initially we focus on the capabilities needed for inferencing (evaluation).
Caffe2, PyTorch, Microsoft Cognitive Toolkit, Apache MXNet and other tools are developing ONNX support. Enabling interoperability between different frameworks and streamlining the path from research to production will increase the speed of innovation in the AI community. We are an early stage and we invite the community to submit feedback and help us further evolve ONNX.
Start experimenting today:
Check ONNX design choices and internals:
- Overview
- ONNX intermediate representation spec
- Versioning principles of the spec
- Operators documentation
- Python API Overview
ONNX is a community project. We encourage you to join the effort and contribute feedback, ideas, and code. You can join one of the working groups and help shape the future of ONNX.
Check out our contribution guide and call for contributions to get started.
If you think some operator should be added to ONNX specification, please read this document.
We encourage you to open Issues, or use Gitter for more real-time discussion:
Stay up to date with the latest ONNX news. [Facebook] [Twitter]
A binary build of ONNX is available from Conda, in conda-forge:
conda install -c conda-forge onnx
You will need an install of protobuf and numpy to build ONNX. One easy way to get these dependencies is via Anaconda:
# Use conda-forge protobuf, as default doesn't come with protoc
conda install -c conda-forge protobuf numpy
You can then install ONNX from PyPi (Note: Set environment variable ONNX_ML=1 for onnx-ml):
pip install onnx
You can also build and install ONNX locally from source code:
git clone https://github.com/onnx/onnx.git
cd onnx
git submodule update --init --recursive
python setup.py install
Note: When installing in a non-Anaconda environment, make sure to install the Protobuf compiler before running the pip installation of onnx. For example, on Ubuntu:
sudo apt-get install protobuf-compiler libprotoc-dev
pip install onnx
After installation, run
python -c "import onnx"
to verify it works. Note that this command does not work from a source checkout directory; in this case you'll see:
ModuleNotFoundError: No module named 'onnx.onnx_cpp2py_export'
Change into another directory to fix this error.
ONNX uses pytest as test driver. In order to run tests, first you need to install pytest:
pip install pytest nbval
After installing pytest, do
pytest
to run tests.
Check out contributor guide for instructions.