1 / 20

74.419 Artificial Intelligence 2005/06

74.419 Artificial Intelligence 2005/06. Features, Gaps, Movement Questions and Passives. Features, Gaps, and Questions. Features Questions Passives Gaps Movement. Verb SUBCAT Feature. Sample Rule: ( VP )  ( V SUBCAT -np-vp:inf ) ( NP ) ( VP VFORM inf ).

dasha
Download Presentation

74.419 Artificial Intelligence 2005/06

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. 74.419 Artificial Intelligence 2005/06 Features, Gaps, Movement Questions and Passives

  2. Features, Gaps, and Questions • Features • Questions • Passives • Gaps • Movement

  3. Verb SUBCAT Feature Sample Rule: (VP)  (VSUBCAT -np-vp:inf) (NP) (VPVFORM inf) Example: (VP)  (wantSUBCAT -np-vp:inf) (class) (to endVFORM inf)

  4. Prep. Phrases - PFORM Feature Sample Rule: (VP)  (VSUBCAT -np-pp:loc) (NP) (PPPFORM LOC) Example: (VP)  (putSUBCAT -np-pp:loc) (the tire) (on the capPFORM loc)

  5. More Verb SUBCATs Sample Rule: (VP)  (VSUBCAT -np-adjp) (NP) (ADJP) Example: (VP)  (heldSUBCAT -np-adjp) (the cop) (responsible)

  6. Auxiliaries - Some Features Modal Verb Verb form 'past' e.g.did buy person, number e.g. I, you, he, we, they did Complement Verb form'base' e.g. did buy Verb form 'base' e.g.have paid Complement Verb form'past participle' e.g.have seen

  7. VP (AUXCOMPFORMbase) (VPVFORMbase) cansee have to match (unification) VP (AUXCOMPFORM?s) (VPVFORM?s) general form VP (AUXCOMPFORMing) (VPVFORMing) isbringing progressive perfect, with past participle VP (AUXCOMPFORMpastprt) (VPVFORMpastprt) hasbrought

  8. Questions

  9. Category (POS), here: PP-word (prepositional phrase) These characteristics give information about the type of the answer! sentence / phrase:question Q, relative clause R type, here:time specification POS category, here: pronoun agreement, matches:3rd person singular or plural type of PP, here:location, motion spec. binary featurePOSS: possessive QDET: used as determiner

  10. Rules for NP(noun phrase) PROquestion word (possessive pronoun): who, whose (POSS +), which, what Features: POSS, WH from rule 1 (POSS +): whose (book) Complement NP QDETquestion (determiner): which (book), what (file) PPwith NP question: in which store, in whose pockets PPquestion: where, when inheritance of features

  11. Parsing Question - Which dogs did he see? gap - NP missing

  12. Passives

  13. Active and Passive - Example gap - NP missing

  14. Passives - Example The box was moved. VP[pastprt, +passgap]V[_np, pastprt] moved moveis normally V[_np] np is missing,thus +passgap VP (AUX[be]) (VP[pastprt], +passgap) wasmoved VP[pastprt, +passgap] (AUX[be]) (VP[pastprt], +passgap) features are inherited downwards / passed upwards from main verb, VP (move, moved)

  15. Movement

  16. Additional References • James Allen: Natural Language Understanding. Benjamin Cummings, 1995

More Related