Process the data according to a <code>preProcess</code> object

Process the data according to a preProcess object

preproc_data(raw_training_data, ppc, labels)

Arguments

raw_training_data	a `data.frame` of sanitized data
ppc	a `preProcess` object from `get_ppc()`
labels	`character` or `factor` the labels

a named list with two elements: data a data.frame with the transformed data; labels the labels