Why do we have the protein reordering

[dagap]

In your dataloader, you have the following lines:

self.alphabet = "ACDEFGHIKLMNPQRSTVWY"
self.reorder_alphabet = "DEKRHNQSTPGAVILMCFYW"

Could you please comment on this alphabet reordering? I guess the ordering orders them by some properties of the amino acids but I am not sure what purpose it is serving in the code.