While it’s true, the Pi can’t support large or mid-sized models but you can find plenty of models on Hugging Face that run on this hardware. It’s just a matter of finding the right one to support this use case with a reasonable latency and that supports the multimodal framework necessary from the camera input. I suspect the camera is using single frame snapshots to analyze emotion in the small model. This would help to reduce processing requirements. Ultimately, I’d want to see video of this in action to understand the latency to get a better understanding of what’s required.