Matching with the current public release of EELSFitter on pip. With v2.0.0 EELSFitter was rewritten to work as a python package and to be functional on 3 dimensional spectral data sets. v3.0.0 focused on refining the determination of the hyperparameters to simplify and make it better to use. Additionally a regularisation constant option was added to further improve the output of the models.
As always, refer to the documentation on how to use EELSFitter: https://lhcfitnikhef.github.io/EELSfitter/build/html/index.html