IRGNM

AcronymDefinition
IRGNMIteratively Regularized Gauss-Newton Method
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The nonlinear inverse problem in (5) is solved by the iteratively regularized Gauss-Newton method (IRGNM) [27] where the nonlinear problem is linearized in each Gauss-Newton step and solved by the fast iterative shrinkage-thresholding algorithm [28].
Similar to [8], 10 Gauss-Newton steps were used for IRGNM to ensure convergence.
Starting from an initial guess [x.sub.0], the numerical problem is then solved using the iteratively regularized Gauss-Newton method (IRGNM), which uses the following linear update rule: