onnx模型导出

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请问时如何导出onnx模型的？我导出的模型在推理时报如下错误：
error: (-2:Unspecified error) in function 'void cv::dnn::dnn4_v20200908::ONNXImporter::populateNet(cv::dnn::dnn4_v20200908::Net)'

(expected: 'shapes.depth() == CV_32S'), where
'shapes.depth()' is 5 (CV_32FC1)
must be equal to
'CV_32S' is 4 (CV_32SC1)

Aborted (core dumped)