ArcFace Implementation using Custom Head Hump back

Hi All
I have created public kernel making use of Custom Head for implementing ArcFace loss which has given state of art results in competition Hump Back Whale Identification.

There is need to improvise this one by putting in Centre features computation for which I need help .
Please provide your useful suggestion.how to make this better
Please read in paper for which I have given link in the kernel to understand on Feature centralization .
https://www.kaggle.com/jaideepvalani/arcface-humpback-customhead-fastai

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