【直播】【青年科学半月谈】机器学习贝叶斯力场及量化不确定性的分子动力学模拟

活动名称：

机器学习贝叶斯力场及量化不确定性的分子动力学模拟

活动时间：

2023年1月12日（周四）10:00

报告嘉宾：

谢玙 哈佛大学

主办单位：

蔻享学术

直播通道

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报告人介绍

谢玙 哈佛大学

Yu Xie is a PhD candidate in Prof. Boris Kozinsky’s group at Harvard University. Her research focuses on the development of machine learning Bayesian force fields for active learning and large-scale molecular dynamics simulations. She is also working on the applications of machine learning force field simulations for phase transition and catalysis systems.

报告简介

In this work, we present an efficient machine learning interatomic force field model and a Bayesian active learning workflow, FLARE. Specifically, a many-body force field is constructed from a sparse Gaussian process (SGP) regression model based on atomic cluster expansion descriptors. Utilizing the uncertainty of SGP as acquisition criteria, we propose an autonomous on-the-fly learning for highly efficient data collection from first principles and training of the model. To circumvent the high computational cost of the SGP forces and uncertainty calculation, we formulate a high-performance mapping and demonstrate a speedup of several orders of magnitude. The GPU acceleration that we implement enables micron-scale reactive molecular dynamics simulations of heterogeneous catalysis systems. We also demonstrate the applications of FLARE on phase transition, nanoparticles, and thermal transport.

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编辑：吴良秀

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