- Support for specifying **`extra_opset`** in ONNX. **`--onnx_extra_opset`** can be converted using an extended opset by specifying the following string. **`com.microsoft:1`** or **`ai.onnx.contrib:1`** or **`ai.onnx.ml:1`**
- https://github.com/onnx/tensorflow-onnx/issues/1617
- https://github.com/onnx/tensorflow-onnx/blob/master/tf2onnx/constants.py
- https://github.com/microsoft/onnxruntime-extensions/blob/main/tutorials/tf2onnx_custom_ops_tutorial.ipynb
- https://github.com/microsoft/onnxruntime-extensions