A general convergence analysis on inexact Newton method for nonlinear inverse problems
For researchers working on nonlinear inverse problems, this work offers a unified theoretical framework for a broad class of spectral filter methods, though it is an incremental extension of existing convergence theories.
The paper provides a general convergence analysis for inexact Newton methods applied to nonlinear ill-posed inverse problems with noisy data, proving convergence and optimal convergence rates under Hölder source conditions.
We consider the inexact Newton methods $$ x_{n+1}^\d=x_n^\d-g_{\a_n}(F'(x_n^\d)^* F'(x_n^\d)) F'(x_n^\d)^* (F(x_n^\d)-y^\d) $$ for solving nonlinear ill-posed inverse problems $F(x)=y$ using the only available noise data $y^\d$ satisfying $\|y^\d-y\|\le \d$ with a given small noise level $\d>0$. We terminate the iteration by the discrepancy principle $$ \|F(x_{n_\d}^\d)-y^\d\|\le τ\d<\|F(x_n^\d)-y^\d\|, \qquad 0\le n<n_\d $$ with a given number $τ>1$. Under certain conditions on $\{\a_n\}$ and $F$, we prove for a large class of spectral filter functions $\{g_\a\}$ the convergence of $x_{n_\d}^\d$ to a true solution as $\d\rightarrow 0$. Moreover, we derive the order optimal rates of convergence when certain Hölder source conditions hold. Numerical examples are given to test the theoretical results.