A light weight regularization for wave function parameter gradients in quantum Monte Carlo

Shivesh Pathak, Lucas K. Wagner

Research output: Contribution to journalArticlepeer-review

Abstract

The parameter derivative of the expectation value of the energy, E/ p, is a key ingredient in variational Monte Carlo (VMC) wave function optimization methods. In some cases, a naïve estimate of this derivative suffers from an infinite variance, which inhibits the efficiency of optimization methods that rely on a stable estimate of the derivative. In this work, we derive a simple regularization of the naïve estimator, which is trivial to implement in existing VMC codes, has finite variance, and a negligible bias, which can be extrapolated to zero bias with no extra cost. We use this estimator to construct an unbiased, finite variance estimation of E/ p for a multi-Slater-Jastrow trial wave function on the LiH molecule and in the optimization of a multi-Slater-Jastrow trial wave function on the CuO molecule. This regularized estimator is a simple and efficient estimator of E/ p for VMC optimization techniques.

Original languageEnglish (US)
Article number085213
JournalAIP Advances
Volume10
Issue number8
DOIs
StatePublished - Aug 1 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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