OS-windows 10(64 bit)
python 3.9.7
opencv-python==4.5.3.56
I’m working object detection model using opencv. First, i trained my custom model based on yolov5 algorithm and then export checkpoint (.pt) into onnx format with the help of ultralytics/yolov5 official export.py.
when i am trying to run my object detection program using opencv.
this code 
net=cv2.dnn.readNetFromONNX (‘onnx model path’) throws error below-
global C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-sn_xpupm\opencv\modules\dnn\src\onnx\onnx_importer.cpp (2127) cv::dnn::dnn4_v20210608::ONNXImporter::handleNode DNN/ONNX: ERROR during processing node with 2 inputs and 1 outputs: [Unsqueeze]:(391)
cv2.error: OpenCV(4.5.3) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-sn_xpupm\opencv\modules\dnn\src\onnx\onnx_importer.cpp:2146: error: (-2:Unspecified error) in function ‘cv::dnn::dnn4_v20210608::ONNXImporter::handleNode’
Node [Unsqueeze]:(391) parse error: OpenCV(4.5.3) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-sn_xpupm\opencv\modules\dnn\src\onnx\onnx_importer.cpp:1551: error: (-215:Assertion failed) node_proto.input_size() == 1 in function ‘cv::dnn::dnn4_v20210608::ONNXImporter::handleNode’
