OpenCV cannot import ONNX model: constBlobs.find(node_proto.input(0)) == constBlobs.end() #22859
Description
System Information
opencv-python-rolling 4.6.0.20221112
Operating System / Platform Windows 10 64 bit
Python 3.10.4
Detailed description
I converted the GINets from PaddleSeg to ONNX:
https://github.com/PaddlePaddle/PaddleSeg/tree/release/2.6/configs/ginet
Netron loads the resulting ONNX fine. This fails to load in OpenCV 4.6 pre-release:
[ERROR:0@0.634] global D:\a\opencv-python\opencv-python\opencv\modules\dnn\src\onnx\onnx_importer.cpp (1053) cv::dnn::dnn4_v20220524::ONNXImporter::handleNode DNN/ONNX: ERROR during processing node with 2 inputs and 1 outputs: [MatMul]:(onnx_node!p2o.MatMul.0) from domain='ai.onnx'
Traceback (most recent call last):
File "d:\Local\devel\Python\OpenCV\dnn_segmentation_paddle_ginet_cityscape\inference.py",
line 131, in <module>
model = cv2.dnn.readNet(model_path)
cv2.error: OpenCV(4.6.0-dev) D:\a\opencv-python\opencv-python\opencv\modules\dnn\src\onnx\onnx_importer.cpp:1072: error: (-2:Unspecified error) in function 'cv::dnn::dnn4_v20220524::ONNXImporter::handleNode'
> Node [MatMul@ai.onnx]:(onnx_node!p2o.MatMul.0) parse error: OpenCV(4.6.0-dev) D:\a\opencv-python\opencv-python\opencv\modules\dnn\src\onnx\onnx_importer.cpp:2039: error: (-215:Assertion failed) constBlobs.find(node_proto.input(0)) == constBlobs.end() in function 'cv::dnn::dnn4_v20220524::ONNXImporter::parseMatMul'
I get the exact same message for the Pascal VOC and ADE models.
Steps to reproduce
model = cv2.dnn.readNet(model_path)
Find the model here: https://drive.google.com/file/d/1G08J-eeqs9G1KFzwkjsFh95BrEj16-yS/view?usp=sharing
Issue submission checklist
- I report the issue, it's not a question
- I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
- I updated to the latest OpenCV version and the issue is still there
- There is reproducer code and related data files (videos, images, onnx, etc)