Conjugate gradient algorithm can be accelerated by using _________

Conjugate gradient algorithm can be accelerated by using _________ Correct Answer Preconditioning strategies

Conjugate gradient algorithm can be accelerated by using preconditioning strategies. Preconditioner of a matrix has to be symmetric positive definite and fixed and that cannot be changed from iteration to iteration. The behavior of the preconditioned conjugate gradient method may become unpredictable.
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