FTIR spectra of extra-virgin olive oils by geographic origin (4 classes)

120 samples, 570 spectral variables, 4 classes (labels 0-3).
Classes correspond to the country of origin. The mapping used here is:
0=Greece, 1=Italy, 2=Portugal, 3=Spain (label order not verifiable
from the source file).

The original spectral axis (wavenumbers) was not provided with the
source data, so feature columns are indexed sequentially (0..569).

Task: classification.

Related publication:

    Tapp, H.S., Defernez, M., Kemsley, E.K. (2003).
    FTIR spectroscopy and multivariate analysis can distinguish the
    geographic origin of extra virgin olive oils. J. Agric. Food Chem.
    https://doi.org/10.1021/jf021056m

