Lexicalized Tree-Adjoining Grammars (LTAG) - ad-teaching.infor...

More documents

Recommendations

Info

Substitution Example (Substitution) S NP N Mary NP↓ VP V NP↓ saw S D a NP D↓ N cat NP VP N V NP Mary saw D N a cat 20 / 52
Adjunction Definition (Adjunction) Let γ be a tree containing an internal node n labeled by X and β an auxiliary tree whose root node is also labeled by X. By applying the <strong>ad</strong>junction operation on (γ, n) and β, one gets a copy γ ′ of γ in which β has taken the place of the subtree t rooted by n and t has been attached to the foot node of β. If γ, n, β do not fulfill the above conditions, the operation is undefined. S X X S X ∗ γ β γ ′ X X ∗ 21 / 52
Page 1 and 2: Lexicalized Tree-Adjoining Grammars
Page 3 and 4: Context-Free Grammars Definition (C
Page 5 and 6: Tree-Substitution Grammars Example
Page 7 and 8: Outline 1 Why CFGs are not enough (
Page 9 and 10: Cross-Serial Dependencies Example (
Page 11 and 12: Lexicalization Example (Lexicalized
Page 13 and 14: Lexicalization Example (CFG which i
Page 15 and 16: Outline 1 Why CFGs are not enough (
Page 17 and 18: Initial Trees Definition (Initial T
Page 19: Substitution Definition (Substituti
Page 23 and 24: Adjunction Constraints Given TAG G
Page 25 and 26: Lexicalization Example (strong lexi
Page 27 and 28: Further Formal Properties of TAL Tr
Page 29 and 30: TAG Parsing Parser: Given a string
Page 31 and 32: Recognizing Adjunction But the algo
Page 33 and 34: Dotted Tree We introduce the notion
Page 35 and 36: Chart Items The algorithm stores in
Page 37 and 38: Scan Operations Input string: c 1
Page 39 and 40: Complete Operations 1 2 3 [γ, adr,
Page 41 and 42: Recognizer Algorithm Algorithm (Rec
Page 43 and 44: Complexity of Recognizer Given: n:
Page 45 and 46: Recognizing Substitution Recognizer
Page 47 and 48: LTAG-Spinal Parser LTAG-spinal: Rou
Page 49 and 50: LTAG-Spinal Parser Graphical repres
Page 51 and 52: Conclusion TAG: a grammar formalism

Lexicalized Tree-Adjoining Grammars (LTAG) - ad-teaching.infor...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?