Permutationally invariant polynomial representation of polarizability tensor surfaces for linear regression analysis

Permutationally invariant polynomial representation of polarizability tensor surfaces for linear regression analysis
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用于线性回归分析的极化张量表面的置换不变多项式表示

DOI:
10.1002/jcc.26952
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发表时间:
2022
影响因子:
3
通讯作者:
Kaledin, Alexey L.
Kaledin, Alexey L.
中科院分区:
化学3区
文献类型:
--
作者:
Omodemi, Oluwaseun;Kaledin, Martina;Kaledin, Alexey L.

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描述了分子偶极极化率张量曲面(PTS)的笛卡尔表示的线性参数化函数形式。PTS的建议表达式是最近报道的原始Applequist模型的幂级数模型的线性化,其通过构造在参数空间中是非线性的。这种新方法具有(i)最小二乘拟合问题的独特解决方案;(ii)与势能和偶极矩表面相比,所得线性回归过程的计算复杂性较低;以及(iii)与非线性PTS模型相比,具有竞争力的准确性。CH 4PTS的计算,极化率拟合到9000个训练设定点,能量高达14,000 cm− 1,显示出使用约1600个参数获得的线性PTS模型的令人印象深刻的准确度:在1000个配置的测试集上,非线性与线性模型的RMSE分别为约1%和0.3%。
A linearly parameterized functional form for a Cartesian representation of molecular dipole polarizability tensor surfaces (PTS) is described. The proposed expression for the PTS is a linearization of the recently reported power series ansatz of the original Applequist model, which by construction is non‐linear in parameter space. This new approach possesses (i) a unique solution to the least‐squares fitting problem; (ii) a low level of the computational complexity of the resulting linear regression procedure, comparable to those of the potential energy and dipole moment surfaces; and (iii) a competitive level of accuracy compared to the non‐linear PTS model. Calculations of CH4PTS, with polarizabilities fitted to 9000 training set points with the energies up to 14,000 cm−1show an impressive level of accuracy of the linear PTS model obtained with ~1600 parameters: ~1% versus 0.3% RMSE for the non‐linear vs. linear model on a test set of 1000 configurations.
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