19. The non-transitory computer readable storage medium of claim 17 , further comprising modifying the adaptive speech recognition model with training data derived from audio user interaction with a digital assistant.
19. The non-transitory computer readable storage medium of claim 17 , further comprising modifying the adaptive speech recognition model with training data derived from audio user interaction with a digital assistant. 20. The non-transitory computer readable storage medium of claim 19 , further comprising, after said updating: receiving invocation of the digital assistant; receiving speech input from a second user; generating speech-to-text output corresponding to the speech input; and providing the speech-to-text output to the digital assistant.