Journal
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
Volume 16, Issue 9, Pages 5685-5694Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jctc.0c00580
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Funding
- Austrian Science Fund (FWF) [P29893]
- Colaboratory, a free service of Google Research
- Austrian Science Fund (FWF) [P29893] Funding Source: Austrian Science Fund (FWF)
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Orbital-free approaches might offer a way to boost the applicability of density functional theory by orders of magnitude in system size. An important ingredient for this endeavor is the kinetic energy density functional. Snyder et al. [Phys. Rev. Lett. 2012, 108, 253002] presented a machine learning approximation for this functional achieving chemical accuracy on a one-dimensional model system. However, a poor performance with respect to the functional derivative, a crucial element in iterative energy minimization procedures, enforced the application of a computationally expensive projection method. In this work we circumvent this issue by including the functional derivative into the training of various machine learning models. Besides kernel ridge regression, the original method of choice, we also test the performance of convolutional neural network techniques borrowed from the field of image recognition.
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