تقرير
An unsupervised machine-learning checkpoint-restart algorithm using Gaussian mixtures for particle-in-cell simulations
| العنوان: | An unsupervised machine-learning checkpoint-restart algorithm using Gaussian mixtures for particle-in-cell simulations |
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| المؤلفون: | Chen, Guangye, Chacón, Luis, Nguyen, Truong B. |
| سنة النشر: | 2021 |
| المجموعة: | Computer Science |
| مصطلحات موضوعية: | Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Machine Learning |
| الوصف: | We propose an unsupervised machine-learning checkpoint-restart (CR) lossy algorithm for particle-in-cell (PIC) algorithms using Gaussian mixtures (GM). The algorithm features a particle compression stage and a particle reconstruction stage, where a continuum particle distribution function is constructed and resampled, respectively. To guarantee fidelity of the CR process, we ensure the exact preservation of charge, momentum, and energy for both compression and reconstruction stages, everywhere on the mesh. We also ensure the preservation of Gauss' law after particle reconstruction. As a result, the GM CR algorithm is shown to provide a clean, conservative restart capability while potentially affording orders of magnitude savings in input/output requirements. We demonstrate the algorithm using a recently developed exactly energy- and charge-conserving PIC algorithm on physical problems of interest, with compression factors $\gtrsim75$ with no appreciable impact on the quality of the restarted dynamics. Comment: Extended abstract for Supercheck21. arXiv admin note: substantial text overlap with arXiv:2007.12273 |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2105.13797 |
| رقم الأكسشن: | edsarx.2105.13797 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |