fftrees_ranktrees ranks trees in an FFTrees object x
based on the current goal (either "cost" or as specified in x$params$goal).
fftrees_ranktrees is called by the main FFTrees function
when creating FFTs from and applying them to (training) data.
fftrees_ranktrees(x, data = "train")An FFTrees object.
The type of data to be used (as character).
Default: data = "train".
FFTrees for creating FFTs from and applying them to data.