CS计算机代考程序代写 TRALE

TRALE

TRALE

CSC485/2501

November 26, 2021

∣∣∣ Computer Science

November 26, 2021 1 / 8

Outline

Semantics vs agreement

SubCat

Gap and Movement

Semantic head driven generation

(Beta reduction and quantifier)

November 26, 2021 2 / 8

Semantics vs agreement

SubCat

Gap and Movement

Semantic head driven generation

(Beta reduction and quantifier)

November 26, 2021 3 / 8

The Active Voice

The goalie kicked the ball.

S

VP

NP

the ball
theme

V

kicked

NP

The goalie
agent

sem:(kick, agent:goalie, theme:ball)

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The Passive Voice

The ball was kicked.
S

VP

VP

NP

ε

V

kicked

aux

was

NP

The ball
theme

sem:(kick, agent:?, theme:ball)

November 26, 2021 5 / 8

The Passive Voice

The ball was kicked.

S (gap)

VP (gap)

VP (gap)

NP

ε

V

kicked

aux

was

NP

The ball
theme

sem:(kick, agent:?, theme:ball)

November 26, 2021 6 / 8

Semantic Head Driven Generation: TLDR

TLDR: Replace cat> with sem head> on all the semantic heads.

An NP’s semantic head is the N.

A VP’s semantic head is the V.

A CLP semantic head is the CL.

An S semantic head is the VP.

November 26, 2021 7 / 8

Semantic Head Driven Generation: Basic Idea

gen(s, sem:(kick, agent:goalie, theme:ball)).

Top-down or buttom-up generator: too slow to traverse all of the possible rules.

However, we can utilize the fact that the semantics (sem) of the semantic head is
exactly the same as the product (left hand side).

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