This could be particularly useful if one has a library of different process tensors (as I proposed in #119). Then the library only needs to hold the most accurate, fine, and long process tensors. The coarser ones could then be straightforwardly generated from the finer ones.
It could be useful to have a function that computes smaller process tensors (in MPO form) from larger ones by:
The function header would then look like this:
This could be particularly useful if one has a library of different process tensors (as I proposed in #119). Then the library only needs to hold the most accurate, fine, and long process tensors. The coarser ones could then be straightforwardly generated from the finer ones.