System Information

opencv version 4.7.0-dev
operation system ubuntu 20.04
python 3.8.10

Detailed description

i am trying to read the paddle onnx model using cv.dnn.readnet() function , but it is throwing error. but the onnx model works fine with onnxruntime.

cv2.error: OpenCV(4.7.0-dev) /home/neoastra/opencv/modules/dnn/src/onnx/onnx_graph_simplifier.cpp:85: error: (-212:Parsing error) Initializer with name Constant_119 not found in function 'getInputInitializerId'

Steps to reproduce

install ppocr from paddleocr github repo.
export the recognition model into onnx format using paddle2onnx.

then use open.dnn.readnet(rec_model.onnx) you will get the error

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)