Open Neural Network Exchange (ONNX) (http://onnx.ai/) is the first step towards an open ecosystem that empowers you to choose the right tools as the project evolves. ONNX provides an open source format for deep learning models. It defines an extensible computation graph model, as well as definitions of built-in operators and standard data types. Caffe2, PyTorch, Microsoft Cognitive Toolkit, Apache MXNet, and other tools are developing ONNX support. This project can help in product-ionizing PyTorch models.