@金天 在jetson nano上用yolov3的onnx转trt报错，不知道是不是Onnx格式不一样。一定要用Onnx-tensorrt写吗，不太明白这之间的关系。

Loading ONNX file from path yolov4_coco_m2_asff_544.onnx...
Beginning ONNX file parsing
Completed parsing of ONNX file
Building an engine from file yolov4_coco_m2_asff_544.onnx; this may take a while...
[TensorRT] ERROR: Network must have at least one output
Completed creating Engine
Traceback (most recent call last):
  File "onnx_to_tensorrt.py", line 185, in <module>
    main()
  File "onnx_to_tensorrt.py", line 153, in main
    with get_engine(onnx_file_path, engine_file_path) as engine, engine.create_execution_context() as context:
  File "onnx_to_tensorrt.py", line 126, in get_engine
    return build_engine()
  File "onnx_to_tensorrt.py", line 117, in build_engine
    f.write(engine.serialize())
AttributeError: 'NoneType' object has no attribute 'serialize'