LING 6520: Comparative Topics in Linguistics (from a computational perspective)

1
LING 6520 Comparative Topics in Linguistics
(from a computational perspective)

• Martha Palmer
• Jan 15, 2008

2

• What does Linguistics offer Computational Lexical
  Semantics?
• What does Computational Lexical Semantics offer
  Linguistics?
• What can we do together?

3
Linguistics ? CLS

• Syntactic structure dependencies
• Jackendoff
• Lexical Conceptual Structures
• Fillmore, Talmy, Dowty, .
• Case frames, conceptual analyses, proto-roles,.
• Levins English verb classes
• Other languages?
• Lexicographic sense distinctions
• Discourse structure
• Event representations

4
CLS ? Linguistics

• Quantitative analysis of data
• Frequency counts, mutual information, automatic
  clustering, new varied classifications
• Word co-occurrences, subcat frame distributions,
  pp attachment preferences, word alignments
• tomorrow
• Grammatical formalisms
• TAGs, LFGs, CCGs, HPSGs
• Alternative building blocks for human sentence
  processing models of regular sense extensions

5
Feature-based Lexicalized Tree-Adjoining
Grammars Joshi,et al 75, Joshi 85,

• Elementary trees
• Initial trees
• Auxiliary trees
• Two operations
• Substitution
• Adjunction

6
Same event - different syntactic frames

• John broke windows.
• SUBJ VERB OBJ
• Windows broke.
• SUBJ VERB

7
Syntactic Parses
8
Elementary Trees
9
Substitution
S
VP
NP?
NP
NP
NP?
V
John
det
N
break
the
window
10
Substitution
S
VP
NP?
NP
NP?
NP?
V
John
det
N
break
the
window
11
Derived Tree
S
VP
NP?
NP ?
V
John
det
N
break
the
window
12
Feature-based Substitution
S
VPsing past
NP?
NPsing
NP
NP?
V
John
det
N
break
the
window
13
Derived Tree w/ Features
S
VP sing past
NPsing
NP?
V
John
det
N
break
the
window
14
Adjunction
S
VP
NP?
VP
NP?
V
John
Adv
VP
det
N
break
quickly
the
window
15
Adjunction (cont.)
S
VP
NP?
Adv
John
quickly
16
Extending Senses Through Adjunction