extras.optim

Implements the LSQR algorithm.

Functions

cg	Perform conjugate gradient (CG) optimization for image reconstruction.
loss_l2_AHreg	Compute the norm of the residual in the image domain.
loss_l2_reg	Compute the regularized least squares loss for MRI reconstruction.
lsmr	Solve a general regularized linear least-squares problem using the LSMR algorithm.
lsqr	Solve a general regularized linear least-squares problem using the LSQR algorithm.