torch.onnx — PyTorch 1.10.1 documentation
https://pytorch.org/docs/stable/onnx.htmlOperatorExportTypes.ONNX_FALLTHROUGH: Try to convert all ops to standard ONNX ops in the default opset domain. If unable to do so (e.g. because support has not been added to convert a particular torch op to ONNX), fall back to exporting the op into a custom opset domain without conversion. Applies to custom ops as well as ATen ops.