onnx-model-opset-convert-guide.md

Most PPLNN supported ops are based on onnx opset 11. If you are using onnx model with different opset version, you need to convert your onnx model opset version to 11.

Use ONNX Official Opset Convert Tool

ONNX officially provided an opset convert tool version_converter. Its tutorials is at: Version Conversion. Please update to onnx v1.11(or above) and try version_converter:

import onnx
from onnx import version_converter

model = onnx.load("<your_path_to_onnx_model>")
converted_model = version_converter.convert_version(onnx_model, 11)
onnx.save(converted_model, "<your_save_path>")