Gradient boosting with bias correction estimates Tr M^{-n} in lattice QCD from cheaper observables in favorable ensembles, but needs a substantial labeled fraction and fails for light-quark Tr M^{-3,4}.
Friedman,Greedy function approximation: A gradient boosting machine., The Annals of Statistics29(2001) 1189
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Machine Learning Estimation on the Trace of Inverse Dirac Operator using the Gradient Boosting Decision Tree Regression
Gradient boosting with bias correction estimates Tr M^{-n} in lattice QCD from cheaper observables in favorable ensembles, but needs a substantial labeled fraction and fails for light-quark Tr M^{-3,4}.