[Pkg-exppsy-maintainers] Dataset label question

[Per B. Sederberg]

Howdy folks:

I've a need to have more complex labels, or at least supplementary
labels, for a dataset.  I tried passing in an array with two columns
for the labels, but this does not work because the unique values
fails.  What I need is that when the dataset is split for cross
validation based on the chunks, I need to be able to perform some
additional selectSamples in the train_dat, but the labels, themselves,
are not enough information for me because I need to remove some
samples, but only if they are not of a specific type (that is not
defined by the labels.)

Any ideas?  Is there anything already in place?

Thanks,
Per