4. The method of claim 3 , 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.
4. The method of claim 3 , 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. 5. The method of claim 4 , wherein generating speech-to-text output corresponding to the speech input comprises: comparing the speech input with the adaptive speech recognition model; in accordance with a determination that the second user is the same as the first user, performing automatic speech recognition using the adaptive speech recognition model to generate speech-to-text output; and in accordance with a determination that the second user is distinct from the first user, performing automatic speech recognition using a speaker-independent model to generate speech-to-text output.