Thanks a lot for the link. I'll be sure to take a look into it in more detail.

Keyword spotting is one of the modules we run in this demo. That's how we detect "Hey Barista". We also run an engine we can "Speech-to-Intent" that infers user request from follow up command.

One thing I wanted to mention is that there are two challenges when running DNNs on embedded platforms (1) limited compute power (CPU) (2) limited memory (RAM). RPi zero is definitely bound by (1) but not (2) as you get 100 MBs of RAM on it.