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A Parallel Evolution Strategy for an Earth Imaging Problem in Geophysics

Diouane, Youssef and Gratton, Serge and Vasseur, Xavier and Vicente, Luis Nunes and Calandra, Henri A Parallel Evolution Strategy for an Earth Imaging Problem in Geophysics. (2016) Optimization and Engineering, 17 (1). 3-26. ISSN 1389-4420

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Official URL: http://dx.doi.org/10.1007/s11081-015-9296-8

Abstract

In this paper we propose a new way to compute a rough approximation solution, to be later used as a warm starting point in a more refined optimization process, for a challenging global optimization problem related to Earth imaging in geophysics. The warm start con- sists of a velocity model that approximately solves a full-waveform inverse problem at low frequency. Our motivation arises from the availability of massively parallel computing plat- forms and the natural parallelization of evolution strategies as global optimization methods for continuous variables. Our first contribution consists of developing a new and efficient parametrization of the velocity models to significantly reduce the dimension of the original optimization space. Our second contribution is to adapt a class of evolution strategies to the specificity of the physical problem at hands where the objective function evaluation is known to be the most expen- sive computational part. A third contribution is the development of a parallel evolution strategy solver, taking advantage of a recently proposed modification of these class of evolu- tionary methods that ensures convergence and promotes better performance under moderate budgets. The numerical results presented demonstrate the effectiveness of the algorithm on a realistic 3D full-waveform inverse problem in geophysics. The developed numerical approach allows us to successfully solve an acoustic full-waveform inversion problem at low frequencies on a reasonable number of cores of a distributed memory computer.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://link.springer.com/ The original PDF of the article can be found at Optimization and Engineering website : http://link.springer.com/article/10.1007/s11081-015-9296-8
HAL Id:hal-01396146
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Universidade de Coimbra (PORTUGAL)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Université de Toulouse > Université Toulouse 1 Capitole - UT1 (FRANCE)
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Deposited By: Youssef Diouane
Deposited On:08 Dec 2015 16:58

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