Dialogue State Architecture
Dialogue State Architecture uses dialogue acts instead of simple frame filling to perform generation; used currently more in research.
NLU: slot fillers to extract user’s utterance, using ML Dialogue State Tracker: maintains current state of dialogue Dialogue policy: decides what to do next (think GUS’ policy: ask, fill, respond)—but nowaday we have more complex dynamics NLG: respond dialogue acts dialogue acts combines speech-acts with underlying states
slot filing we typically do this with BIO Tagging with a BERT just like NER Tagging, but we tag for frame slots.
the final <cls> token may also work to classify domain + intent.
corrections are hard folks sometimes uses hyperarticulation (“exaggerated prosody”) for correction, which trip up ASR
correction acts may need to be detected explicitly as a speech act:
dialogue policy we can choose over the last frame, agent and user utterances:
we can probably use a neural architecture to do this.
whether to confirm via ASR confirm:
<\alpha: reject \geq \alpha: confirm explicitly \geq \beta: confirm implicitly \geq \gamma: no need to confirm NLG once the speech act is determined, we need to actually go generate it: 1) choose some attributes 2) generate utterance
We typically want to delexicalize the keywords (Henry serves French food => [restraunt] serves [cruisine] food), then run through NLG, then rehydrate with frame.