Acta mathematica scientia,Series A ›› 2023, Vol. 43 ›› Issue (2): 570-580.

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Two Extended HS-type Conjugate Gradient Methods with Restart Directions

Liu Pengjie(),Wu Yanqiang(),Shao Feng,Zhang Yan,Shao Hu   

  1. School of Mathematics, China University of Mining and Technology, Jiangsu Xuzhou 221116
  • Received:2022-02-11 Revised:2022-10-17 Online:2023-04-26 Published:2023-04-17
  • Supported by:
    National Natural Science Foundation of China(72071202);Fundamental Research Funds for the Central Universities(2017XKQY090);Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX22_2491);Graduate Innovation Program of China University of Mining and Technology(2022WLKXJ021);Teaching and Research Project of CUMT(2022DLZD04-203)

Abstract:

The conjugate gradient method is one of the effective methods to solve large-scale unconstrained optimization. In this paper, the Hestenes-Stiefel (HS) conjugate parameter is improved, and then two extended HS-type conjugate gradient methods with restart directions are established by introducing restart conditions and restart directions. The first method produces descent direction under the weak Wolfe line search, and the second one obtains sufficient descent independent of any line search. Under conventional assumptions, the global convergence results of the two proposed methods are analyzed and obtained. Finally, the numerical comparison results and performance graphs show the effectiveness of the new methods.

Key words: Unconstrained optimization, Conjugate gradient method, Restart direction, Weak Wolfe line search, Global convergence

CLC Number: 

  • O221.2
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