Great question — answering as the UphillTech team:
The RefPerSys website is a fair bit cryptic on what a UI to it should actually do. It's generally non-sensibly oscillating between extremely "high-level" goals like "artificial general intelligence" and extremely nitty-gritty implementation details that nobody should even wonder about in the 2020s, like "UTF-8 encoded strings". So I'm having a hard time actually reviewing the website for any quantifiable design approach; the linked refpersys-design.pdf is anything but a design document; it does the same, but even less focused on what it's currently describing. You say it's an "inference engine", but to me the whole design document suggests instead it's an unspecific multithreaded actor...
Full answer by Marcus Müller: https://unix.stackexchange.com/a/807043 (CC BY-SA 4.0).
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