nanshe/nanshe/expanded_numpy.py: In the function roll, store slicing in advance.
nanshe/nanshe/expanded_numpy.py: In the function roll, store slicing in advance.

jakirkham/nanshe,DudLab/nanshe,nanshe-org/nanshe,nanshe-org/nanshe,jakirkham/nanshe,DudLab/nanshe