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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
... and I just saw: https://petewarden.com/2019/03/07/launching-tensorflow-lite-for-microcontrollers/amp/
Looks like they have training data which probably has numbers in, as well as pretty much everything you need to get some C++ files that you can build for a microcontroller: https://github.com/tensorflow/tensorflow/tree/master/tensorflow/lite/experimental/micro/examples/micro_speech
I don't believe it would be particularly hard to get it built into Espruino.