ONNX is a representation and interchange format that training/inference frameworks can use to represent models. However, ONNX does not have a tensor engine of i

ONNX is a representation and interchange format that training/inference frameworks can use to represent models. However, ONNX does not have a tensor engine of its own. So you would still define and train your model in tensorflow, pytorch, etc, and then save the model in ONNX format, at which point it can be ported to any inference service that supports the ONNX format.