arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.01799math.NAcs.NA
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将深度学习与全波形反演相结合

Coupling Deep Learning with Full Waveform Inversion

Columbia University(哥伦比亚大学);Rice University(莱斯大学)

Wen Ding, Kui Ren, Lu Zhang

AI总结:

本文提出将深度学习与全波形反演结合,通过离线-在线策略提升计算效率。

摘要:

全波形反演(FWI)旨在利用多个入射源生成的波场数据来重建波方程中的未知物理系数。在本文中,我们提出了一种离线-在线计算策略,用于将经典的基于最小二乘的计算反演与现代基于学习的方法相结合,以实现无法仅通过单一组件实现的优势。简而言之,我们开发了一种离线学习策略,通过加权优化构建逆运算的稳健近似,并利用它来设计一个新的目标函数,用于近似在线反演的新数据集。近似的在线反演然后作为真实在线反演的预热起点。我们通过数值模拟证明,我们的耦合策略在中等计算资源(在训练数据集大小和计算成本方面)上提高了FWI的计算效率。

英文摘要:

Full waveform inversion (FWI) aims to reconstruct unknown physical coefficients in wave equations using the wavefield data generated from multiple incoming sources. In this work, we propose an offline-online computational strategy for coupling classical least-squares-based computational inversion with modern learning-based approaches for FWI to achieve advantages that can not be achieved with only one of the components. \RED{In brief, we develop an offline learning strategy to construct a robust approximation of the inverse operator through weighted optimization and utilize it to design a new objective function for approximate online inversion with new datasets. The approximate online inversion then serves as a warm start for the true online inversion.} We demonstrate through numerical simulations that our coupling strategy improves the computational efficiency of FWI with reliable offline training on moderate computational resources (in terms of both the size of the training dataset and the computational cost needed).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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