The default is "initial_split", you can pass any other split
type from the rsample library.
.split_args
The default is NULL in order to use the default split arguments.
If you want to pass other arguments then must pass a list with the parameter name
and the argument.
Author
Steven P. Sanderson II, MPH
Details
Create a splits object that returns a list object of both the
splits object itself and the splits type. This function supports all splits
types from the rsample package.