SLIDE 1
Announcements
2
61A Lecture 37 Wednesday, April 29 Announcements 2 Announcements - - PowerPoint PPT Presentation
61A Lecture 37 Wednesday, April 29 Announcements 2 Announcements - - PowerPoint PPT Presentation
61A Lecture 37 Wednesday, April 29 Announcements 2 Announcements Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm 2 Announcements Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm Quiz 4 due Thursday 4/30 @ 11:59pm 2 Announcements
SLIDE 2
SLIDE 3
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
2
SLIDE 4
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
2
SLIDE 5
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
- No videos on Friday 5/1; Come to lecture (and fill out the HKN course survey at the end)
2
SLIDE 6
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
- No videos on Friday 5/1; Come to lecture (and fill out the HKN course survey at the end)
§If at least 60% of students respond, everyone gets an extra credit point
2
SLIDE 7
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
- No videos on Friday 5/1; Come to lecture (and fill out the HKN course survey at the end)
§If at least 60% of students respond, everyone gets an extra credit point
- Next week: 18 hours of review sessions Monday, Tuesday, & Wednesday 11-5 in 271/273 Soda
2
SLIDE 8
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
- No videos on Friday 5/1; Come to lecture (and fill out the HKN course survey at the end)
§If at least 60% of students respond, everyone gets an extra credit point
- Next week: 18 hours of review sessions Monday, Tuesday, & Wednesday 11-5 in 271/273 Soda
§Two TAs are available every hour
2
SLIDE 9
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
- No videos on Friday 5/1; Come to lecture (and fill out the HKN course survey at the end)
§If at least 60% of students respond, everyone gets an extra credit point
- Next week: 18 hours of review sessions Monday, Tuesday, & Wednesday 11-5 in 271/273 Soda
§Two TAs are available every hour §One room will be a review session going over topic-specific problems
2
SLIDE 10
Announcements
- Homework 9 (4 pts) due Wednesday 4/29 @ 11:59pm
- Quiz 4 due Thursday 4/30 @ 11:59pm
- No videos on Friday 5/1; Come to lecture (and fill out the HKN course survey at the end)
§If at least 60% of students respond, everyone gets an extra credit point
- Next week: 18 hours of review sessions Monday, Tuesday, & Wednesday 11-5 in 271/273 Soda
§Two TAs are available every hour §One room will be a review session going over topic-specific problems §The other room is unstructured; staff will answer any questions you have
2
SLIDE 11
Ambiguity
SLIDE 12
Syntactic Ambiguity in English
4
Programs must be written for people to read
SLIDE 13
Syntactic Ambiguity in English
4
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 14
Syntactic Ambiguity in English
4
Sentence
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 15
Syntactic Ambiguity in English
4
Sentence Noun Phrase
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 16
Syntactic Ambiguity in English
4
Sentence Noun Phrase Verb Phrase
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 17
Syntactic Ambiguity in English
4
Sentence Noun Phrase Verb Phrase Subordinate Clause
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 18
Syntactic Ambiguity in English
5
Sentence Noun Phrase Verb Phrase Subordinate Clause
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 19
Syntactic Ambiguity in English
6
Verb Phrase Verb Phrase Sentence Noun Phrase
1Preface of Structure and Interpretation of Computer Programs
by Harold Abelson and Gerald Sussman with Julie Sussman
1
Programs must be written for people to read
SLIDE 20
Syntactic Ambiguity in English
7
pro•gram (noun) a series of coded software instructions pro•gram (verb) provide a computer with coded instructions must (verb) be obliged to must (noun) dampness or mold
Definitions from the New Oxford American Dictionary
Programs must be written for people to read
SLIDE 21
Syntax Trees
SLIDE 22
Representing Syntactic Structure
9
SLIDE 23
Representing Syntactic Structure
9
cows
SLIDE 24
Representing Syntactic Structure
9
cows Noun
SLIDE 25
Representing Syntactic Structure
9
cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 26
Representing Syntactic Structure
9
cows intimidate Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 27
Representing Syntactic Structure
9
cows intimidate Noun Verb
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 28
Representing Syntactic Structure
9
cows intimidate Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 29
Representing Syntactic Structure
9
Sentence cows intimidate Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 30
Representing Syntactic Structure
9
Sentence Noun Phrase cows intimidate Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 31
Representing Syntactic Structure
9
Sentence Noun Phrase cows intimidate Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 32
Representing Syntactic Structure
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 33
Representing Syntactic Structure
A Tree represents a phrase:
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 34
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 35
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 36
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 37
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 38
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 39
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 40
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 41
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 42
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 43
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 44
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 45
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
SLIDE 46
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
cows = Leaf('N', 'cows')
SLIDE 47
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
cows = Leaf('N', 'cows') intimidate = Leaf('V', 'intimidate')
SLIDE 48
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
cows = Leaf('N', 'cows') intimidate = Leaf('V', 'intimidate') S, NP, VP = 'S', 'NP', 'VP'
SLIDE 49
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
cows = Leaf('N', 'cows') intimidate = Leaf('V', 'intimidate') S, NP, VP = 'S', 'NP', 'VP' Tree(S, [Tree(NP, [cows]),
SLIDE 50
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
cows = Leaf('N', 'cows') intimidate = Leaf('V', 'intimidate') S, NP, VP = 'S', 'NP', 'VP' Tree(S, [Tree(NP, [cows]), Tree(VP, [intimidate,
SLIDE 51
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
cows = Leaf('N', 'cows') intimidate = Leaf('V', 'intimidate') S, NP, VP = 'S', 'NP', 'VP' Tree(S, [Tree(NP, [cows]), Tree(VP, [intimidate, Tree(NP, [cows])])])
SLIDE 52
Representing Syntactic Structure
A Tree represents a phrase:
- tag -- What kind of phrase (e.g., S, NP, VP)
- branches -- Sequence of Tree or Leaf components
A Leaf represents a single word:
- tag -- What kind of word (e.g., N, V)
- word -- The word
9
Sentence Noun Phrase cows intimidate Noun Phrase Verb Phrase Noun Verb cows Noun
Photo by Vince O'Sullivan licensed under http://creativecommons.org/licenses/by-nc-nd/2.0/
(Demo) cows = Leaf('N', 'cows') intimidate = Leaf('V', 'intimidate') S, NP, VP = 'S', 'NP', 'VP' Tree(S, [Tree(NP, [cows]), Tree(VP, [intimidate, Tree(NP, [cows])])])
SLIDE 53
Grammars
SLIDE 54
Context-Free Grammar Rules
11
SLIDE 55
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
SLIDE 56
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP
SLIDE 57
A Sentence ...
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP
SLIDE 58
A Sentence ... ... can be expanded as ...
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP
SLIDE 59
A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP
SLIDE 60
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP
SLIDE 61
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S NP VP
SLIDE 62
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S S NP VP
SLIDE 63
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S NP VP S NP VP
SLIDE 64
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S NP VP S NP VP NP N
SLIDE 65
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S NP VP N S NP VP NP N
SLIDE 66
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S NP VP N S NP VP NP N N buffalo
SLIDE 67
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo NP VP N S NP VP NP N N buffalo
SLIDE 68
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo NP VP N S NP VP NP N N buffalo
SLIDE 69
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo NP VP N S NP VP NP N VP V NP N buffalo
SLIDE 70
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo NP VP N NP V S NP VP NP N VP V NP N buffalo
SLIDE 71
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo NP VP N NP V S NP VP NP N VP V NP N buffalo V buffalo
SLIDE 72
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo buffalo NP VP N NP V S NP VP NP N VP V NP N buffalo V buffalo
SLIDE 73
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo buffalo NP VP N NP V S NP VP NP N VP V NP N buffalo V buffalo
SLIDE 74
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo buffalo NP VP N NP V N S NP VP NP N VP V NP N buffalo V buffalo
SLIDE 75
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo buffalo NP VP N NP V buffalo N S NP VP NP N VP V NP N buffalo V buffalo
SLIDE 76
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo buffalo NP VP N NP V buffalo N S NP VP NP N VP V NP N buffalo V buffalo
SLIDE 77
Grammar A Sentence ... ... can be expanded as ... ... a Noun Phrase then a Verb Phrase.
Context-Free Grammar Rules
A grammar rule describes how a tag can be expanded as a sequence of tags or words
11
S NP VP S buffalo buffalo NP VP N NP V buffalo N S NP VP NP N VP V NP N buffalo V buffalo (Demo)
SLIDE 78
Parsing
SLIDE 79
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
SLIDE 80
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo
SLIDE 81
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S
SLIDE 82
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S
SLIDE 83
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S
SLIDE 84
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S 1 2 3 4
SLIDE 85
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S NP 1 2 3 4
SLIDE 86
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S VP NP 1 2 3 4
SLIDE 87
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
13
buffalo buffalo buffalo buffalo S VP NP 1 2 3 4
SLIDE 88
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
14
S NP VP buffalo buffalo buffalo buffalo 1 2 3 4
SLIDE 89
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
14
S NP VP N buffalo buffalo buffalo buffalo 1 2 3 4
SLIDE 90
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
14
S NP VP N
Constraint: A Leaf must match the input word
buffalo buffalo buffalo buffalo 1 2 3 4
SLIDE 91
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
14
S NP VP N
Constraint: A Leaf must match the input word
buffalo buffalo buffalo buffalo 1 2 3 4
SLIDE 92
V J N NP
Exhaustive Parsing
Expand all tags recursively, but constrain words to match input
14
S NP VP N
Constraint: A Leaf must match the input word
buffalo buffalo buffalo buffalo 1 2 3 4
SLIDE 93
Exhaustive Parsing
15
1 2 3 4 Expand all tags recursively, but constrain words to match input S NP VP buffalo buffalo buffalo buffalo
SLIDE 94
Exhaustive Parsing
16
Expand all tags recursively, but constrain words to match input S NP VP buffalo buffalo buffalo buffalo 1 2 3 4
SLIDE 95
Exhaustive Parsing
16
Expand all tags recursively, but constrain words to match input S NP VP buffalo buffalo buffalo buffalo J N 1 2 3 4
SLIDE 96
Exhaustive Parsing
16
Expand all tags recursively, but constrain words to match input S NP VP buffalo buffalo buffalo buffalo NP N V J N 1 2 3 4
SLIDE 97
Exhaustive Parsing
16
(Demo) Expand all tags recursively, but constrain words to match input S NP VP buffalo buffalo buffalo buffalo NP N V J N 1 2 3 4
SLIDE 98
Learning
(Demo)
SLIDE 99
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
SLIDE 100
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
SLIDE 101
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S
SLIDE 102
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS
SLIDE 103
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP
SLIDE 104
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS
SLIDE 105
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags
SLIDE 106
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 25372
SLIDE 107
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 25372 1335
SLIDE 108
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 25372 1335 6679
SLIDE 109
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 25372 1335 6679 4282
SLIDE 110
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 5 25372 1335 6679 4282
SLIDE 111
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 5 25372 1335 6679 4282 25
SLIDE 112
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 5 25372 1335 6679 4282 26 25
SLIDE 113
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
18
teacher strikes idle kids
S NP NN NNS VB NNS NP VP S NP VP NP NN NNS NN teacher NNS strikes VB idle NNS kids VP VB NP NP NNS Rule frequency per 100,000 tags 5 32 25372 1335 6679 4282 26 25
SLIDE 114
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
19
VP S NN VBZ JJ NNS NP NP Rule frequency per 100,000 tags 19 5 18 32 4358 25372 3160 2526 1335 6679 4282 26 25
teacher strikes idle kids
S NP VP NP NN NN teacher VBZ strikes JJ idle NNS kids VP VBZ NP NP JJ NNS
SLIDE 115
Scoring a Tree Using Relative Frequencies
Not all syntactic structures are equally common
19