Adaptive nonmonotone line search method for unconstrained optimization
Qunyan Zhou , Wenyu Sun
Front. Math. China ›› 2007, Vol. 3 ›› Issue (1) : 133 -148.
In this paper, an adaptive nonmonotone line search method for unconstrained minimization problems is proposed. At every iteration, the new algorithm selects only one of the two directions: a Newton-type direction and a negative curvature direction, to perform the line search. The nonmonotone technique is included in the backtracking line search when the Newton-type direction is the search direction. Furthermore, if the negative curvature direction is the search direction, we increase the steplength under certain conditions. The global convergence to a stationary point with second-order optimality conditions is established. Some numerical results which show the efficiency of the new algorithm are reported.
Nonmonotone method / Newton-type direction / direction of negative curvature / adaptive line search / unconstrained optimization
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