I thought at first the library would just call out to some web API to do the actual magic, but seems it's actually running the model locally, which is very nice to see.
So it seems there is a bundled models (bundle/models/{small,medium,large}) but I don't see the code responsible for creating those. Anyone knows where the source is located? It's the final piece of the puzzle to figure out if this thing is FOSS or not.