  We discuss results for bottomonium at nonzero temperature obtained using
NRQCD on Fastsum Generation 2L ensembles, as part of the Fastsum
collaboration's programme to determine the spectrum of the bottomonium system
as a function of temperature using a variety of approaches. Here we give an
update on results for spectral functions obtained using Kernel Ridge
Regression. We pay in particular attention to the generation of training data
and introduce the notion of using lattice QCD ensembles to learn how to improve
the generation of training data. A practical implementation is given.
