Transcript Extract Questions from Sentences

Extract Questions from
Sentences
Purpose
• The behavior of extracting questions from
sentences can be regarded as extracting
semantics or knowledge from passages.
• The knowledge extracted can be used to
– Answer queries directly
– Support semantic computing
A Blueprint (Ultimate Goal)
• What is the difference between football and
basketball?
– Learn passages about football and basketball.
– Get the knowledge from the passages that they are
two kinds of team sports.
– Learning passages about team sports to get the
knowledge of what aspects a team sport involves.
– Using the commonsense that difference should be
worked out by comparing every aspects of each side
of comparison.
– List every aspects of the two sport that are different.
Problems
• A series of problems involved
– Knowledge extracting from sentences
– Knowledge expressing and storage
– Knowledge organization (indexing, grouping and
linking)
– Knowledge update
– Knowledge utilization
– Knowledge source
– Conflict resolution
–…
Knowledge extracting
Knowledge extracting
• Extracting knowledge from sentences
– Knowledge within a single sentence
– Knowledge across several sentences

later
• In order to represent the knowledge extracted
from sentences before having a mature way to
express the knowledge, they will be expressed
by just asking simple questions.
• The task is simplified as extracting questions
from sentences.
Category of Sentences
• Purpose of sentences
– Declarative Sentence
– Interrogative Sentence (疑问句)
– Imperative Sentence
(祈使句)
– Exclamatory Sentence (感叹句)

X
X
later
• Structure of sentences
– Simple sentence
– Sentence with one or more clauses
first
later
Declarative Sentence
• Almost every syntax component can be
asked in the sentence.
• Subject
• Predicate
• Complement
• Prepositional phrase (manner, reason,
time, location, person, …)
• …
Basic Grammar Patterns of DS
• Subject + Predicate
– What does [subject] do?
– Who/What does …?
• Subject + be + object
– What is [subject]?
• Subject + linking verb + complement
– How does [subject] [linking verb]
– A[n] looks[lv] like[prep] B[n].
• How does A look?
• What/Who does A/B look like?
• …
Lexical Analysis
• Make use of WordNet
– Nouns, verbs, adjectives and adverbs.
• Prepositions
What to do in the following week
Do information gathering work focusing on Simple
Sentence (without clauses).
• Conclude the basic patterns that appear
frequently.
(increasingly)
• Find the syntax components of sentences in
each pattern that people care most and the
way to ask about them.
(increasingly)
• Find a way to justify whether a given sentence
matches any of the concluded pattern.