HPC: Cupy

[ashwinvis]

We have to talk of:

• support for both CUDA and ROCm
• Array API: how cupy arrays can still work with numpy functions through __array_ufunc__ and __array_function__
• stream execution

[ashwinvis]

scipy and numpy functions

[ashwinvis]

Mention Array API: https://data-apis.org/array-api/2023.12/index.html