Why the projector(fc1 and fc2) in graphfair don't have optimizer?How to optimize their parameters?

[Yun-Fu]

Thanks for your wonderful work in Graphair! But I'm so confused about the optimization of the projector, why they don't have any opitimizer?Could they be random parameters that don't need to be updated? https://github.com/divelab/DIG/blob/21476b079c9226f38915dcd082b5c2ee0cddaac8/dig/fairgraph/method/Graphair/graphair.py#L80