Finite State Transducers to build autonomous agents
That's extremely general and is terminology from the days of tape drives that describes techniques that are considered trivial now, like parsing strings into individual words.
Oh, apologies, I didn't realise you were asking for more specific information. You can find that in the link I posted above. There is a copy of a paper in the repo, here's a direct link:
The paper was accepted for publication but it's still in review and anyway I prefer to point people to the repo with the code so they can reproduce the experiments if they want.