Abstract
Convergence properties of restarted conjugate gradient methods are investigated for the case where the usual requirement that an exact line search be performed at each iteration is relaxed.
The objective function is assumed to have continuous second derivatives and the eigenvalues of the Hessian are assumed to be bounded above and below by positive constants. It is further assumed that a Lipschitz condition on the second derivatives is satisfied at the location of the minimum.
A class of descent methods is described which exhibitn-step quadratic convergence when restarted even though errors are permitted in the line search. It is then shown that two conjugate gradient methods belong to this class.
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Sponsored by the United States Army under Contract No. DA-31-124-ARO-D-462.
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Lenard, M.L. Convergence conditions for restarted conjugate gradient methods with inaccurate line searches. Mathematical Programming 10, 32–51 (1976). https://doi.org/10.1007/BF01580652
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DOI: https://doi.org/10.1007/BF01580652