A list of settings and values for vtreat binomial classification fitting.
Please see
https://github.com/WinVector/vtreat/blob/master/Examples/fit_transform/fit_transform_api.md,
mkCrossFrameCExperiment,
designTreatmentsC, and
prepare.treatmentplan for details.
classification_parameters(user_params = NULL)list of user overrides.
filled out parameter list