1 / 18

COMP 4060 Natural Language Processing

COMP 4060 Natural Language Processing. Discourse and Dialogue. Discourse and Dialogue. Discourse Phenomena Speech Acts Dialogue Acts. Discourse. Discourse = collocated, related group of sentences Monologues and Dialogues Referring Expressions : he, she Coherence Discourse Structure

juliet
Télécharger la présentation

COMP 4060 Natural Language Processing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. COMP 4060 Natural Language Processing Discourse and Dialogue

  2. Discourse and Dialogue • Discourse Phenomena • Speech Acts • Dialogue Acts

  3. Discourse • Discourse = collocated, related group of sentences • Monologues and Dialogues • Referring Expressions: he, she • Coherence • Discourse Structure see Jurafsky and Martin, Ch. 18 and 19

  4. Reference the Jurafsky • Referring Expressions • Referent the 406 textbook

  5. Reference • Discourse Model - keeps track of representations of entities mentioned in discourse so far • Referring Expression - encodes information / signals for hearer to identify referent Methods: • Determine mapping from sign in referring expression to set of beliefs / discourse model of hearer. • Referents can be different parts, aspects of a sentence or utterance. • Use constraints on co-reference (syntax, discourse) to determine mapping.

  6. Reference "According to John, Bob bought Sue an Integra, and Sue bought Fred a Legend." • But that turned out to be a lie.speech act • But that was false. proposition • That caused Sue to become rather poor. event • That caused both of them to become rather poor. combination of events

  7. Reference • Indefinite / definite noun phrases • specific / non-specific entity • Pronouns • salience (last mentioned) • cataphora (pronoun mentioned before entity) • bound in context of "quantified variable" • Demonstratives (this, that) • "spatial proximity" (metaphorically), e.g. old - new car

  8. Coherence Coherence Relations (Hobbs) – model "connectedness" of sentences in text • Result John bought an Acura. His father went ballistic. • Explanation John hid Bill's car keys. He was drunk. • Parallel John bought an Acura. Bill leased a BMW. • Elaboration John bought an Acura this weekend. He purchased a new beautiful Acura for ... on Saturday afternoon. • Occasion John bought an Acura. He drove to the ballgame.

  9. Discourse Structure • Arrangement of sentence elements into (coherent) text / analysis of text according to coherence relations Jurafsky and Martin, Figure 18.10, p. 705

  10. Speech Acts

  11. Three Aspects of Speech Acts • Locutionary: the literal meaning of the utterance • Illocutionary: the social function that the utterance or written text has (e.g. informing, ordering, warning, undertaking.) • Perlocutionary: the result or effect that is produced by the utterance in that given context (e.g. convincing, persuading, deterring.)

  12. Illocutionary Acts • Assertives • Directives • Commissives • Permissives • Prohibitives • Declaratives

  13. Speech Acts • Assertives • committing the speaker to something's being the case • “The door is shut.” • Directives • attempts by the speaker to get the addressee to do something • “Shut the door.” • Commissives • committing the speaker to some future course of action • “I will shut the door.” • Expressives • expressing the psychological state of the speaker about a state of affairs • "Thanks for shutting the door."

  14. Speech Acts • Permissives • allow / permit the hearer to a course of action as described by the propositional content of the utterance • "You may shut the door." • Prohibitives • deny the hearer to a course of action as described by the propositional content • "Don't shut the door." • Declarations / Declaratives • bringing about a different state of the world via the utterance • "You're fired."

  15. DAMSL - Dialogue Act Markup in Several Layers • Statement • Info-request • Check • Influence on Addressee • Influence on Speaker • Offer • Commit • Conventional • Opening ...

  16. Questions and Frames

  17. Reference Dan Jurafsky and James H. Martin, Speech and Language Processing, 1st Edition, Chapters 18 and 19, Prentice-Hall, 2000

More Related