ArcFace input clarification

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Question

I am trying to use ArcFace, and I am not sure how to format the input image into the model's 'data' tensor;

this line of code suggests that RGB values of range 0-255 must be translated to values between -0.5 to +0.5

But then, looking at the values stored inside the input_0.pb of the test data are in the range of about -35 to +35

Further information

Trying to use this from C# ... is there any existing example using ImageSharp?

Is this issue related to a specific model?

arcfaceresnet100-8.onnx

Notes

It could be nice if all the models of the model zoo would have a small section describing the RGB to Tensor conversion, specially if it's not a plain normalization and do require some odd transformations like mean/stddev

Start with vision/body_analysis/arcface/dependencies/helper.py at the referenced line and compare its preprocessing with the input_0.pb file in the linked test data. Clarify the expected ArcFace tensor conversion and whether an ImageSharp example exists, then document the preprocessing guidance for this model or the model zoo.