Workflows encompasses the three main stages of the modeling process: pre-processing of data, model fitting, and post-processing of results. This page enumerates the possible operations for each stage that have been implemented to date.
Pre-processing
The three elements allowed for pre-processing are:
A standard model formula via
add_formula().A tidyselect interface via
add_variables()that strictly preserves the class of your columns.A recipe object via
add_recipe().
You can use one or the other but not both.
Model Fitting
parsnip model specifications are the only option here,
specified via add_model().
When using a preprocessor, you may need an additional formula for
special model terms (e.g. for mixed models or generalized linear
models). In these cases, specify that formula using
add_model()’s formula argument, which will be
passed to the underlying model when fit() is called.
Post-processing
tailor post-processors are the only option here,
specified via add_tailor(). Some examples of
post-processing model predictions could include adding a probability
threshold for two-class problems, calibration of probability estimates,
truncating the possible range of predictions, and so on.