Question about the input feature of pockets

Hi,

I have two questions about the input features of pockets.

1) For 'side', I think it means whether the atom is in the side chain. So, I do not understand why the value is 0, 1, and 2.
2) For 'residue', it only shows the index of residue (e.g., D190, C315). I think the name of residue (e.g., ARG, PHE) is a more commonly used feature. I want to know how can I convert the index to a name.

Thanks