matrices - How is the preconditioned conjugate gradient algorithm related to the steepest descent method? - Mathematics Stack Exchange

There is a method to greatly simplify the preconditioned conjugate method into the steepest descent method, also known as gradient descent. I'm aware that the gradient is equal to $$2A^t(A\vec{x}

Conjugate gradient method - Wikipedia

Preconditioned nonlinear conjugate gradient method for micromagnetic energy minimization - ScienceDirect

numpy - Python - Solve Ax=b using Gradient Descent - Stack Overflow

Chapter 5 Conjugate Gradient Methods Introduction to Mathematical Optimization

matrices - How is the preconditioned conjugate gradient algorithm related to the steepest descent method? - Mathematics Stack Exchange

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Distributed estimation over sensor networks based on distributed conjugate gradient strategies - Xu - 2016 - IET Signal Processing - Wiley Online Library

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Preconditioned nonlinear conjugate gradient method for micromagnetic energy minimization - ScienceDirect