Applications of Mathematics, first online, pp. 1-20
A self-scaling memoryless BFGS based conjugate gradient method using multi-step secant condition for unconstrained minimization
Yongjin Kim, Yunchol Jong, Yong Kim
Received October 30, 2023. Published online November 15, 2024.
Abstract: Conjugate gradient methods are widely used for solving large-scale unconstrained optimization problems, because they do not need the storage of matrices. Based on the self-scaling memoryless Broyden-Fletcher-Goldfarb-Shanno (SSML-BFGS) method, new conjugate gradient algorithms CG-DESCENT and CGOPT have been proposed by W. Hager, H. Zhang (2005) and Y. Dai, C. Kou (2013), respectively. It is noted that the two conjugate gradient methods perform more efficiently than the SSML-BFGS method. Therefore, C. Kou, Y. Dai (2015) proposed some suitable modifications of the SSML-BFGS method such that the sufficient descent condition holds. For the sake of improvement of modified SSML-BFGS method, in this paper, we present an efficient SSML-BFGS-type three-term conjugate gradient method for solving unconstrained minimization using Ford-Moghrabi secant equation instead of the usual secant equations. The method is shown to be globally convergent under certain assumptions. Numerical results compared with methods using the usual secant equations are reported.
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Affiliations: Yongjin Kim, Yunchol Jong (corresponding author), Yong Kim, Department of Mathematics, University of Sciences, Unjong District 355, 950003, Pyongyang, DPR Korea, e-mail: jyc1963@star-co.net.kp