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We discuss results for bottomonium at nonzero temperature obtained usingNRQCD on Fastsum Generation 2L ensembles, as part of the Fastsumcollaboration's programme to determine the spectrum of the bottomonium systemas a function of temperature using a variety of approaches. Here we give anupdate on results for spectral functions obtained using Kernel RidgeRegression. We pay in particular attention to the generation of training dataand introduce the notion of using lattice QCD ensembles to learn how to improvethe generation of training data. A practical implementation is given.

Reconstruction of bottomonium spectral functions in thermal QCD using Kernel Ridge Regression