Open Neural Network Exchange (ONNX) is 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, both deep learning and traditional ML. It defines an extensible computation graph model, as well as definitions of built-in operators and standard data types. Currently we focus on the capabilities needed for inferencing (scoring).
ONNX is widely supported and can be found in many frameworks, tools, and hardware. Enabling interoperability between different frameworks and streamlining the path from research to production helps increase the speed of innovation in the AI community. We invite the community to join us and further evolve ONNX.
Learn about the ONNX spec
- ONNX intermediate representation spec
- Versioning principles of the spec
- Operators documentation
- Python API Overview
Programming utilities for working with ONNX Graphs
Check out our contribution guide 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:
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
to run tests.
Check out contributor guide for instructions.