Given a dataframe, un scale and un center the continous features
unscale_uncenter(x, categoricalFeatureCols, colMeans, colSd)A dataframe in order to be processed.
A vector of the categorical features, we don't want to scale/center these. Should be 1-indexed.
A vector of the means to add to each column.
A vector of the standard deviations to rescale each column with.
A dataset x in it's original scaling