使用神经密度函数来产生潜在的能量表面
B Jijila1, V Nirmala2, P Selvarengan3
1Queen Mary's College, Chennai, India.
Journal of molecular modeling
|February 10, 2024
概括
本研究引入了一种新的方法,使用机器学习密度函数近似法 (ML-DFA) 来生成潜在能量表面. 这项研究展示了DeepMind的首次应用.
科学领域:
- 量子化学 是一个量子化学.
- 计算化学计算化学
- 机器学习 机器学习
背景情况:
- 机器学习 (ML) 与量子化学的整合正在推进密度函数理论 (DFT).
- DeepMind的深度学习模型 (DM21) 显示了最先进的性能,但其在量子计算中的应用仍未得到充分探索.
- 现有的文献缺乏应用DM21用于产生潜在能量表面 (PES) 的研究.
研究的目的:
- 用机器学习密度函数近似法 (ML-DFA) 证明潜在能量表面 (PES) 的生成.
- 介绍DeepMind预训练的DM21神经网络的首次应用,用于生成ML-DFA-PES.
- 分析基于DM21的PES的长距离行为,并将其与已建立的DFT函数和CCSDT进行比较.
主要方法:
- 在TensorFlow框架内使用预训练的DM21神经网络,从电子密度推断交换相关潜力.
- 计算各种分子几何形状的自相一致场 (SCF) 能量.
- 通过对相关坐标绘制SCF能量来生成二维潜在能量表面 (PES).
- 在开源 Python 代码中使用 PySCF 和 DM21 实现 ML-DFA-PES 方法.
主要成果:
- 成功生成了ML-DFA-PES用于C4H8,H2O,H2和H2+使用DM21m模型与cc-pVDZ基础集.
- 分析了生成的PES的远程行为,评估了它们的描述能力.
- 将基于DM21的PES与从流行的DFT函数 (b3lyp,PW6B95) 和CCSD (T) 中获得的PES进行了比较.
结论:
- 该研究建立了一种基于ML-DFA的新计算方法,用于生成潜在能量表面.
- 预训练的DM21神经网络显示出在量子化学中准确的PES计算的前景.
- 这项工作为ML-DFA-PES生成提供了开源实现,促进了未来的研究.
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