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line search

To examine one strip of film from a straight reconnaissance run.
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Franchois, "A subspace preconditioned LSQR Gauss-Newton method with a constrained linesearch path applied to 3D biomedical microwave imaging," Int.
We follow Scheinberg and Tang [30] and implement a limited-memory BFGS (L-BFGS) variant of the proximal-gradient method that has no linesearch and that approximately evaluates the proximal operator.
This modification takes the place of a potentially expensive linesearch, and the correction is increased at each iteration if a certain condition for decrease is not satisfied.
[27] --, A globally convergent version of mma without linesearch, in Proceedings of the First World Congress of Structural and Multidisciplinary Optimization, N.
Here, a quadratic linesearch technique [8] is employed to determine the step length [[lambda].sup.(k)], with a = [10.sup.-4], [[lambda].sub.min] = 1/10 and [[lambda].sub.max] = 1/2.