PyG backwards compatibility 2.3.1 <- 2.4.0

[M-Lampert]

This is something that already came up in one of our meetings, that self.data.keys worked with or without () depending on the versions. This is caused by PyG where they turned keys() into a method in version 2.4.0 while it was a property in version 2.3.1.

• Version 2.4.0: https://pytorch-geometric.readthedocs.io/en/2.4.0/generated/torch_geometric.data.Data.html#torch_geometric.data.Data.keys
• Version 2.3.1: https://pytorch-geometric.readthedocs.io/en/2.3.1/generated/torch_geometric.data.Data.html#torch_geometric.data.Data.keys We should somehow ensure backwards compatibility.

[M-Lampert]

It is temporarily fixed for now by setting the versions to the newest without ensuring backward compatibility.