用类大模型架构精准计算分子势能面,首获186维水簇高精度结果。
A large language model-type architecture for high-dimensional molecular potential energy surfaces
- 基于图神经网络构建分子子系统交互模型,实现高维势能面建模。
- 在186维水簇上达到亚千卡/摩尔精度,首次实现全维势能面计算。
- 适用于复杂分子体系的量子化学模拟,适合理论与材料研究者。
计算分子系统和材料的高维势能面是计算化学中的重大挑战,对反应速率预测等具有重要意义。本文设计了一种与生成式AI和自然语言处理中大型语言模型相似的算法:将分子体系表示为包含节点、边、面等的图结构,通过这些子系统间的相互作用构建合理规模化学体系(51个核坐标维度)的势能面。为此,采用一组基于图论获得的子系统的神经网络完成任务。进一步探讨该低维图基神经网络家族是否可扩展至186维势能面的准确预测。结果表明,该算法在更高维度问题上仍能提供精确结果,186维势能面误差低于1 kcal/mol。由此,首次实现了质子化21水簇(186个核坐标维度)在CCSD水平精度下的全维势能面计算。
原文摘要 · Abstract (English)
Computing high-dimensional potential energy surfaces for molecular systems and materials is considered to be a great challenge in computational chemistry with potential impact in a range of areas including the fundamental prediction of reaction rates. In this paper, we design and discuss an algorithm that has similarities to large language models in generative AI and natural language processing. Specifically, we represent a molecular system as a graph which contains a set of nodes, edges, faces, etc. Interactions between these sets, which represent molecular subsystems in our case, are used to construct the potential energy surface for a reasonably sized chemical system with 51 nuclear dimensions. For this purpose, a family of neural networks that pertain to the graph-theoretically obtained subsystems get the job done for this 51 nuclear dimensional system. We then ask if this same family of lower-dimensional graph-based neural networks can be transformed to provide accurate predictions for a 186-dimensional potential energy surface. We find that our algorithm does provide accurate results for this larger-dimensional problem with sub-kcal/mol accuracy for the higher-dimensional potential energy surface problem. Indeed, as a result of these developments, here we produce the first efforts towards a full-dimensional potential energy surface for the protonated 21-water cluster (186 nuclear dimensions) at CCSD level accuracy.
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