Fast convergence of trust-regions for non-isolated minima via analysis of CG on indefinite matrices
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Trust-region methods (TR) can converge quadratically to minima where the Hessian is positive definite. However, if the minima are not isolated, then the Hessian there cannot be positive definite. The weaker Polyak-Łojasiewicz (PŁ) condition is compatible wit... ...
