why exportONNXNetwork will add additional "Sub" in onnx, how to remove this layer in onnx?

Hi, i did the following:

>> baseNetwork = resnet50;

>> exportONNXNetwork(baseNetwork,'resnet50-matlab');

but when compare same model in Deep Network Designer and Netron (onnx reader), i found there is additional "Sub" in generated onnx

then i download the official resnet50 from onnx github, there are no "Sub"

https://github.com/onnx/models/tree/master/vision/classification/resnet/resnet50

• https://s3.amazonaws.com/download.onnx/models/opset_6/resnet50.tar.gz

this Sub will cause some issue in my enviroment, how to remove it? also is it a bug or why this Sub exist? thanks

Regards,

Owen

[Rik]

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Answer 1

[Don Mathis]

The Sub operator is subtracting the mean image from the raw image input.