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arXiv 2407.07751physics.chem-ph
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ArcaNN:用于化学反应性机器学习原子间势训练集的自动化增强采样生成

ArcaNN: automated enhanced sampling generation of training sets for chemically reactive machine learning interatomic potentials

Rolf David, Miguel de la Puente, Axel Gomez, Olaia Anton, Guillaume Stirnemann, Damien Laage

AI总结:

ArcaNN是一个自动化增强采样框架,用于生成化学反应性机器学习势的训练集,通过并发学习与先进采样确保高能构型准确表示,并在亲核取代反应中验证了其均匀低误差与广泛适用性。

摘要:

人工智能的出现深刻影响了计算化学,尤其是通过机器学习势(MLPs),它在计算用于分子动力学模拟的原子能量和力时提供了精度与效率的平衡。这些MLPs显著推进了分子动力学模拟在各种应用中的发展,包括材料、界面和化学反应的大规模模拟。尽管取得了这些进展,训练数据集的构建——这是MLPs精度的关键组成部分——却未得到相应的重视。这对于依赖于稀有势垒穿越事件的化学反应性尤其关键。在此,我们通过引入ArcaNN来解决这一空白,这是一个专为生成反应性MLPs训练数据集而设计的综合框架。ArcaNN采用并发学习方法结合先进采样技术,以确保高能几何结构的准确表示。该框架整合了迭代训练、探索、新构型选择以及能量和力标注的自动化流程,同时确保可重复性和文档记录。我们通过一个典型的溶液中的亲核取代反应展示了ArcaNN的能力,展示了其有效性、所得MLP沿整个化学反应坐标的均匀低误差,及其在反应性分子动力学中广泛应用的潜力。我们还提供了如何评估反应性系统NNP质量的指南。

英文摘要:

The emergence of artificial intelligence has profoundly impacted computational chemistry, particularly through machine-learned potentials (MLPs), which offer a balance of accuracy and efficiency in calculating atomic energies and forces to be used in molecular dynamics simulations. These MLPs have significantly advanced molecular dynamics simulations across various applications, including large-scale simulations of materials, interfaces, and chemical reactions. Despite these advances, the construction of training datasets - a critical component for the accuracy of MLPs - has not received proportional attention. This is particularly critical for chemical reactivity which depends on rare barrier-crossing events. Here we address this gap by introducing ArcaNN, a comprehensive framework designed for generating training datasets for reactive MLPs. ArcaNN employs a concurrent learning approach combined with advanced sampling techniques to ensure accurate representation of high-energy geometries. The framework integrates automated processes for iterative training, exploration, new configuration selection, and energy and force labeling, while ensuring reproducibility and documentation. We demonstrate ArcaNN's capabilities through a paradigm nucleophilic substitution reaction in solution, showcasing its effectiveness, the uniformly low error of the resulting MLP everywhere along the chemical reaction coordinate, and its potential for broad applications in reactive molecular dynamics. We also provide guidelines on how to assess the quality of a NNP for a reactive system.

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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