Graphormer-GD Implementation

[goelzva]

🚀 The feature, motivation and pitch

Dear pyg community,

I propose to implement the graphormer-gd transformer layer from the paper Rethinking the Expressive Power of GNNs via Graph Biconnectivity into pyg. The implementation would be similar to e.g. GraphSAGE. There is already an implementation on github, however, it does not use pyg. See here for reference: https://github.com/lsj2408/Graphormer-GD

I'm happy to take this over, however I first want to check that a PR like this would be accepted. Let me know what you think!

Alternatives

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Additional context

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