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A Riemannian subspace BFGS trust region method

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Abstract

Motivated by the subspace techniques in the Euclidean space, this paper presents a subspace BFGS trust region (RTR-SBFGS) algorithm to the problem of minimizing a smooth function defined on Riemannian manifolds. In each iteration of the RTR-SBFGS algorithm, a low-dimensional trust region subproblem is solved, which reduces the amount of computation significantly for large scale problems. A limited-memory variant of RTR-SBFGS, named LRTR-SBFGS, is introduced also. Both RTR-SBFGS and LRTR-SBFGS are proved to converge globally. Under some mild conditions, we establish the local linear convergence of these two methods. Numerical results demonstrate that, compared to the state-of-the-art algorithms, RTR-SBFGS and LRTR-SBFGS are effective methods and subspace techniques are suitable for Riemannian optimization problems.

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Acknowledgements

The work of Wei Hong Yang was supported by the National Natural Science Foundation of China grant 11971118. The authors are grateful to the associate editor and the two anonymous referees for their valuable comments and suggestions.

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Correspondence to Hejie Wei.

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Wei, H., Yang, W.H. & Chai, Y. A Riemannian subspace BFGS trust region method. Optim Lett 17, 1889–1914 (2023). https://doi.org/10.1007/s11590-022-01964-9

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