arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.02345cond-mat.mtrl-sci
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LAMMPS实现人工神经网络快速推导原子间相互作用势

LAMMPS Implementation of Rapid Artificial Neural Network Derived Interatomic Potentials

Doyl Dickel, Mashroor Nitol, Christopher Barrett

摘要:

虽然机器学习方法已经成功地用于表示原子间相互作用势,但它们的速度通常落后于传统的形式主义。这通常是由于用于描述局部原子环境的结构指纹的复杂性以及用于计算这些指纹的大截止半径和邻居列表。即使是最近的机器学习方法也比传统的形式主义慢至少10倍。在LAMMPS分子动力学软件包中实现了一种快速人工神经网络(RANN)式势函数,该势函数利用角筛选在不降低精度的情况下降低了计算复杂度。对于最小的神经网络架构,这种形式主义在速度和准确性方面与改进的嵌入原子方法(MEAM)相媲美,而网络的速度大约是MEAM的三分之一,能够以化学准确性再现训练数据库。LAMMPS实现的数值精度进行评估,通过验证能量守恒能量守恒和协议之间的计算力和压力和观察到的能源的衍生物,以及通过评估在动态模拟的潜力的稳定性。潜在的风格进行了测试,使用力场镁和各种架构的计算效率相比,传统的潜在的模型,以及替代人工神经网络形式主义。发现的预测精度相媲美的速度较慢的方法。

英文摘要:

While machine learning approaches have been successfully used to represent interatomic potentials, their speed has typically lagged behind conventional formalisms. This is often due to the complexity of the structural fingerprints used to describe the local atomic environment and the large cutoff radii and neighbor lists used in the calculation of these fingerprints. Even recent machine learned methods are at least 10 times slower than traditional formalisms. An implementation of a rapid artificial neural network (RANN) style potential in the LAMMPS molecular dynamics package is presented here which utilizes angular screening to reduce computational complexity without reducing accuracy. For the smallest neural network architectures, this formalism rivals the modified embedded atom method (MEAM) for speed and accuracy, while the networks approximately one third as fast as MEAM were capable of reproducing the training database with chemical accuracy. The numerical accuracy of the LAMMPS implementation is assessed by verifying conservation of energy and agreement between calculated forces and pressures and the observed derivatives of the energy as well as by assessing the stability of the potential in dynamic simulation. The potential style is tested using a force field for magnesium and the computational efficiency for a variety of architectures is compared to a traditional potential models as well as alternative ANN formalisms. The predictive accuracy is found to rival that of slower methods.

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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