Thank you, Jim and pitmaster.
I’m still in the process of learning and fully digesting all the new terms that are coming at us. Besides your post and that of pitmaster, I found this older post from Marco that describes (most of the) tools that will be available:
Source: Machine learning, Portfolio123, historical data and ratios - #5 by marco.
I will focus my understanding on these subjects by reading the papers that have been shared by Marco and some posts that I have seen by amonst others you and pitmaster.
Edit: I really like your example of a spline with a knot of abs(70 - FRank('SalesGr%PYQ)), pitmaster. It helps connecting some of the theoretical concepts to what is already being done by some users within P123. Slowly connecting the dots!
Thanks again.