plio.io.io_moon_minerology_mapper file missing

I am trying to work with M3 derived products such as band depths, etc. for which I need to use the command: 
from plio.io.io_moon_minerology_mapper import M3

Howrever, since plio.io doesn't have the io_moon_minerology_mapper file, I am unable to import it so that I can work with my data using libpyhat derived functions. Is there any way I can get some help with this?