krylov-based iterative sparse solvers
Systems of linear equations:
- bicg
- bicgstab
- cg
- cgs
- gmres
- lgmres
- minres
- gcrotmk
- qmr
- tfqmr
- vectors are contiguous Fortran arrays
- routines must be interchangeable
- feature parity with
scipy.sparse.linalg
- OpenMP for GPU parallelism
- verbose mode with formatted output