I built one and it’s open source https://github.com/johnzfitch/specho-v2 last I checked 141D or something but I might have left some dimensions behind at the original specHO repo. I simplified the architecture in v2. That’s essentially how you scale it. Oddly enough the easiest model to predict was humans. Almost like a baseline. See my archived v1 repo for more of the nuts and bolts.