I know there are good methods for approximating a Hessian times a vector without actually forming the hessian. (Example here).
Are there any methods of approximating the Inverse of hessian times a vector? (e.g., $H^{-1}x$)?
What about $H^{-1/2}x$?
2026-03-25 07:44:02.1774424642
Approximation of Inverse Hessian or Inverse Hessian Square Root times a vector
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