subjectivity and sentiment analysis: from words to discourse
DESCRIPTION
Subjectivity and Sentiment Analysis: from Words to Discourse . Jan Wiebe Department of Computer Science Intelligent Systems Program University of Pittsburgh MAVIR November 2010. Foci. Natural Language Processing Understanding text and conversation by computer Recognizing opinions - PowerPoint PPT PresentationTRANSCRIPT
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SUBJECTIVITY AND SENTIMENT ANALYSIS: FROM WORDS TO DISCOURSE
Jan Wiebe
Department of Computer ScienceIntelligent Systems Program
University of Pittsburgh
MAVIR November 2010
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2
FOCI
Natural Language Processing Understanding text and conversation by
computer Recognizing opinions
Public opinion (blogs, comments) News coverage Political speeches
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BURGEONING FIELD
Quite a large problem space Several terms reflecting varying goals
and modelsSentiment AnalysisOpinion Mining Opinion ExtractionSubjectivity AnalysisAppraisal AnalysisAffect SensingEmotion Detection Identifying PerspectiveEtc.
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WHAT IS SUBJECTIVITY?
The linguistic expression of somebody’s opinions, sentiments, emotions, evaluations, beliefs, speculations (private states)
Private state: state that is not open to objective observation or verification Quirk, Greenbaum, Leech, Svartvik (1985).
Note that this particular use of subjectivity is adaptedfrom literary theory E.G. Banfield 1982, Fludernik 1993; Wiebe PhD Dissertation 1990.
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EXAMPLES OF SUBJECTIVE EXPRESSIONS
References to private statesShe was enthusiastic about the planHe was boiling with anger
References to speech or writing events expressing private statesLeaders rounding condemned his verbal
assault on Israel Expressive subjective elements
That would lead to disastrous consequences
What a freak show
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direct subjective span: are happy source: <writer, I, People> attitude:
inferred attitude span: are happy because Chavez has fallen type: neg sentiment intensity: medium target:
target span: Chavez has fallen
target span: Chavez
attitude span: are happy type: pos sentiment intensity: medium target:
direct subjective span: think source: <writer, I> attitude:
attitude span: think type: positive arguing intensity: medium target:
target span: people are happy because Chavez has fallen
I think people are happy because Chavez has fallen
MPQA corpus: http://www.cs.pitt.edu/mpqa
MANUALLY (HUMAN) ANNOTATED NEWS DATA WILSON PHD DISSERTATION 2008
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FOCUS
Our focus is linguistic disambiguation; how should language be interpreted? Is it subjective in the first place? If so, is it
positive or negative? What is it about? Etc. Subjective language is highly ambiguous
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INTERPRETATION
Lexicon ofkeywords out of context
Full contextualInterpretationof words in text or dialogue
continuum
“The dream”NLP methods/resourcesbuilding toward fullinterpretations
Today: several tasks along the continuum
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INTERPRETATION
Lexicon ofkeywords out of context
Full contextualInterpretationof words in textor dialogue
continuum
BrilliantDifferenceHateInterestLove…
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SUBJECTIVITY LEXICONS
Most approaches to subjectivity and sentiment analysis exploit subjectivity lexicons. Lists of keywords that have been gathered
together because they have subjective uses
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AUTOMATICALLY IDENTIFYING SUBJECTIVE WORDS
Much work in this area
E.g. Hatzivassiloglou & McKeown 1997; Wiebe 2000; Turney 2002; Kamps & Marx 2002; Wiebe, Riloff, Wilson 2003; Kim & Hovy 2005; Esuli & Sebastiani 2005;
Subjectivity Lexicon: http://www.cs.pitt.edu/mpqa
Entries from several sources (our work and others’)
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HOWEVER…
Consider the keyword “Interest”. It is in the subjectivity lexicon. But, what about “interest rate”, for example?
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DICTIONARY DEFINITIONS SENSES
Interest, involvement -- (a sense of
concern with and curiosity about someone or something; "an interest in music")
Interest -- (a fixed charge for
borrowing money; usually a percentage of the amount borrowed; "how much interest do you pay on your mortgage?")
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DICTIONARY DEFINITIONS SENSES
Interest, involvement -- (a sense of
concern with and curiosity about someone or something; "an interest in music")
Interest -- (a fixed charge for
borrowing money; usually a percentage of the amount borrowed; "how much interest do you pay on your mortgage?")
S
O
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SENSES
Even in subjectivity lexicons, many senses of the keywords are objective ~50% in our study!
Thus, many appearances of keywords in texts are false hits
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SENSES
His alarm grew as the election returns came in.
He set his alarm for 7am.
His trust grew as the candidate spoke. His trust grew as interest rates
increased.
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WORDNET MILLER 1995; FELLBAUM 1998
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EXAMPLES
“There are many differences between African and Asian elephants.”
“… dividing by the absolute value of the difference from the mean…”
“Their differences only grew as they spent more time together …”
“Her support really made a difference in my life”
“The difference after subtracting X from Y…”
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SUBJECTIVITY SENSE LABELING
Automatically classifying senses as subjective or objective
Wiebe & Mihalcea 2006Gyamfi, Wiebe, Mihalcea, Akkaya 2009
See also: Esuli & Sebastiani 2006, 2007 Andreevskaia & Bergler 2006a,b Su & Markert 2008,2009
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INTERPRETATION
Lexicon of keywords out of context
Full contextualInterpretationof words in text or dialog
continuum
Brilliant sense#1 S sense#2 S …Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O…
Now we will leave the lexicon and look at disambiguation in the context of a text orconversation
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SubjectivitySentenceClassifier
CONTEXTUAL SUBJECTIVITY ANALYSIS“He spins a riveting plot which grabs and holds the reader’s interest…”
S O?
S O?
“The notes do not pay interest.”
Do the sentences contain subjectivity?
E.g. Riloff & Wiebe 2003 Yu & Hatzivassiloglou 2003
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SubjectivityPhrase
Classifier
CONTEXTUAL SUBJECTIVITY ANALYSIS“He spins a riveting plot which grabs and holds the reader’s interest…”
S O?
S O?
“The notes do not pay interest.”
Is a phrase containing a keyword subjective?
Wilson, Wiebe, Hoffmann 2005
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CONTEXTUAL SUBJECTIVITY ANALYSIS
S O?
S O?
Is a phrase containing a keyword positive,Negative, or neutral?
Wilson, Wiebe, Hoffmann 2005
SentimentPhrase
Classifier
Pos, Neg, Neutral?
Pos, Neg, Neutral?
“There are many differences between African and Asian elephants.”
“Their differences only grew as they spent more time together …”
We’ll return to this, topic after next.But first…
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INTERPRETATION
Lexicon of keywords out of context
Full contextualInterpretationof words in text or dialog
continuum
Brilliant sense#1 S sense#2 S …Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O…
ContextualSubjectivityanalysis
Exploiting sense labels to improvethe contextual classifiers
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SubjectivityClassifier
S Sense 4 “a sense of concern with and curiosity about someone or something”
O Sense 1 “a fixed charge for borrowing money”
SUBJECTIVITY TAGGING USING WSD
“The notes do not pay interest.”
“He spins a riveting plot which grabs and holds the reader’s interest…”
WSDSystem
Sense 4
Sense 1
S O?
S O?
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SubjectivityClassifier
S Sense 4 “a sense of concern with and curiosity about someone or something”
O Sense 1 “a fixed charge for borrowing money”
SUBJECTIVITY TAGGING USING WSD
“The notes do not pay interest.”
“He spins a riveting plot which grabs and holds the reader’s interest…”
WSDSystem
Sense 4
Sense 1S O
S O
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EXAMPLES
“There are many differences between African and Asian elephants.” Sense#1 O
“… dividing by the absolute value of the difference from the mean…” Sense#2 O
“Their differences only grew as they spent more time together …” Sense#3 S
“Her support really made a difference in my life” Sense#4 S
“The difference after subtracting X from Y…” Sense#5 O
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“There are many differences between African and Asian elephants.” Sense#1 O
“… dividing by the absolute value of the difference from the mean…” Sense#2 O
“Their differences only grew as they spent more time together …” Sense#3 S
“Her support really made a difference in my life” Sense#4 S
“The difference after subtracting X from Y…” Sense#5 O
Is is one of these?
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“There are many differences between African and Asian elephants.” Sense#1 O
“… dividing by the absolute value of the difference from the mean…” Sense#2 O
“Their differences only grew as they spent more time together …” Sense#3 S
“Her support really made a difference in my life” Sense#4 S
“The difference after subtracting X from Y…” Sense#5 O
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SubjectivityClassifier
SUBJECTIVITY TAGGING USING SUBJECTIVITY WSD
SWSDSystem
S O?
Sense O {1, 2, 5}
Sense S {3,4}
S O?
Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O
“There are many differences between African and Asian elephants.”
“Their differences only grew as they spent more time together …”
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SubjectivityClassifier
SUBJECTIVITY TAGGING USING SUBJECTIVITY WSD
SWSDSystem
S O
Sense O {1, 2, 5}
Sense S {3,4}
S O
Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O
“There are many differences between African and Asian elephants.”
“Their differences only grew as they spent more time together …”
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SWSD AKKAYA, WIEBE, MIHALCEA 2009 AKKAYA, CONRAD, WIEBE, MIHALCEA 2010
Compared system performance when WSD: Using the full sense inventory SWSD: Using only two senses, subj-sense and
obj-sense SWSD Performance is well above baseline
and the performance of full WSD SWSD is a feasible variant of WSD Subjectivity provides a natural course-grained
sense grouping
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SWSD IN SUBJECTIVITY TAGGING
SWSD exploited to improve performance of subjectivity analysis systems
Both S/O and Pos/Neg/Neutral classifiers
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SENTIMENT ANALYSIS USING SWSD
SWSDSystem
Sense O {1, 2, 5}
Sense S {3,4}
Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O
“There are many differences between African and Asian elephants.”
“Their differences only grew as they spent more time together …”
Sentiment Classifier
Pos, Neg, Neutral?
Pos, Neg, Neutral?
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INTERPRETATION
Lexicon of keywords out of context
Full contextualInterpretationof words in text or dialog
continuum
Brilliant sense#1 S sense#2 S …Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O…
SWSD ContextualSentimentAnalysis
Rest of the talk: contextual processing not boundto word senses
Return to contextual sentiment classification
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SENTIMENT ANALYSIS WILSON, WIEBE, HOFFMAN 2005, 2009
Automatically identifying positive and negative emotions, evaluations, and stances Our approach: classify expressions containing a
keyword as positive, negative, both, or neutral
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PHRASE-LEVEL SENTIMENT ANALYSIS
See also, E.G. Yi, Nasukawa, Bunescu, Niblack 2003; Polanyi & Zaenen 2004; Popescu & Etzioni 2005; Suzuki, Takamura, Okumura 2006; Moilanen & Pulman 2007; Choi & Cardie 2008
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PRIOR VERSUS CONTEXTUAL POLARITY
Many subjectivity lexicons contain polarity information
Prior polarity: out of context, positive, negative, or neutral
A word may appear in a phrase that expresses a different polarity in context
Contextual polarity
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MPQA (HUMAN) POLARITY ANNOTATIONS
Judge the contextual polarity of the sentiment that is ultimately being conveyed in the context of the text or conversation
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CONTEXTUAL INTERPRETATION
They have not succeeded, and will never succeed, in breaking the will of this valiant people.
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CONTEXTUAL INTERPRETATION
They have not succeeded, and will never succeed, in breaking the will of this valiant people.
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CONTEXTUAL INTERPRETATION
They have not succeeded, and will never succeed, in breaking the will of this valiant people.
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CONTEXTUAL POLARITY IS COMPLEX
They have not succeeded, and will never succeed, in breaking the will of this valiant people.
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APPROACH
Step 1: Neutral or Polar? Step 2: Are the polar instances Positive or
Negative? Combine a variety of evidence
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EVIDENCE
Modifications and ConjunctionsCheers to Timothy Whitfield for the wonderfully
horrid visuals
Disdain and wrathHatzivassiloglou & McKeown 1997
Subjectivity of the surrounding context; syntactic role in the sentence; etc.
pos
mod
wonderfully horrid
disdain (neg) and wrath(neg)
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POLARITY INFLUENCERS
Negation Local not good Longer-distance dependencies
Does not look very good (proposition) No politically prudent Israeli could support either of
them (subject) Phrases with negations may intensify instead
Not only good, but amazing!
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POLARITY INFLUENCERS
Contextual Valence Shifters Polanyi & Zaenan 2004 General polarity shifter
Pose little threat Contains little truth
Negative polarity shifters Lack of understanding
Positive polarity shifters Abate the damage
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APPROACH
Step 1: Neutral or Polar? Step 2: Are the polar instances Positive or
Negative? Combine a variety of evidence Still much to do in the area of recognizing
contextual polarity
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INTERPRETATION
Lexicon of keywords out of context
Full contextualInterpretationof words in text or dialog
continuum
Brilliant sense#1 S sense#2 S …Difference sense#1 O sense#2 O sense#3 S sense#4 S sense#5 O…
SWSD ContextualSentimentAnalysis
Discourse
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DISCOURSE-LEVEL TREATMENT
Interdependent interpretation of opinions More information about the overall stance
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Somasundaran & Wiebe 2009; Somasundaran et al. 2009a,b; 2008a,b
See also: Bansal,Cardie,Lee 2008; Thomas,Pang,Lee 2006; Diermeier,Godbout,Yu,Kaufmann 2007; Malouf & Mullen 2008; Lin and Hauptmann 2006; Greene & Resnik 2009; Jiang & Argamon 2008; Klebanov, Diermeier, Beigman 2008; Polanyi & Zaenan 2006; Asher, Benamara, Matheiu 2008; Hirst, Riabinin, Graham 2010
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MOTIVATION: INTERDEPENDENT INTERPRETATION OF OPINIONS
D::... this kind of rubbery material, it’s a bit more bouncy, like you said they
get chucked around a lot. A bit more durable and that can also be
ergonomic and it kind of feels a bit different from all the other remote
controls.
Example from the AMI Meeting corpus (Carletta et al., 2005)• Scenario-based goal oriented meeting, where the participants
have to design a new TV remote
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MOTIVATION: INTERDEPENDENT INTERPRETATION OF OPINIONS
D::... this kind of rubbery material, it’s a bit more bouncy, like you said they
get chucked around a lot. A bit more durable and that can also be
ergonomic and it kind of feels a bit different from all the other remote
controls.
positive
positive
positive
?
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D::... this kind of rubbery material, it’s a bit more bouncy, like you said they
get chucked around a lot. A bit more durable and that can also be
ergonomic and it kind of feels a bit different from all the other remote
controls.
MOTIVATION: INTERDEPENDENT INTERPRETATION OF OPINIONS
positive
positive
positive
?
Observation:1. Speaker is talking about the same thing
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MOTIVATION: INTERDEPENDENT INTERPRETATION OF OPINIONS
D::... this kind of rubbery material, it’s a bit more bouncy, like you said they
get chucked around a lot. A bit more durable and that can also be
ergonomic and it kind of feels a bit different from all the other remote
controls.
positive
positive
positive
?
Observation:1. Speaker is talking about the same thing2. Speaker is reinforcing his stance (pro-rubbery material)
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MOTIVATION: INTERDEPENDENT INTERPRETATION OF OPINIONS
D::... this kind of rubbery material, it’s a bit more bouncy, like you said they
get chucked around a lot. A bit more durable and that can also be
ergonomic and it kind of feels a bit different from all the other remote
controls.
positive
positive
positive
Observation:1. Speaker is talking about the same thing2. Speaker is reinforcing his stance (pro-rubbery material) Interpretation coherent with the discourse:Being “a bit different from other remote controls” is positive
positive
Discourse-level relations can help disambiguation of difficult cases
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• Shapes should be curved, so round shapes Nothing square-like.
• ... So we shouldn’t have too square corners and that kind of
thing.
positive
MOTIVATION: MORE INFORMATION ABOUT THE OPINION STANCE
negative
negative
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• Shapes should be curved, so round shapes Nothing square-like.
• ... So we shouldn’t have too square corners and that kind of
thing.
positive
MOTIVATION:MORE INFORMATION ABOUT THE OPINION STANCE
negative
negative
Prediction: Stance regarding the curved shape
QA System: Will the curved shape be accepted?
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• Shapes should be curved, so round shapes Nothing square-like.
• ... So we shouldn’t have too square corners and that kind of
thing.
positive
Direct opinion
MOTIVATION:MORE INFORMATION ABOUT THE OPINION STANCE
negative
negative
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• Shapes should be curved, so round shapes Nothing square-like.
• ... So we shouldn’t have too square corners and that kind of
thing.
positive
Direct opinionOpinions towards
mutually exclusive option (alternative)
MOTIVATION:MORE INFORMATION ABOUT THE OPINION STANCE
negative
negative
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• Shapes should be curved, so round shapes Nothing square-like.
• ... So we shouldn’t have too square corners and that kind of
thing.
positive
Direct opinionOpinions towards
mutually exclusive option (alternative)
MOTIVATION:MORE INFORMATION ABOUT THE OPINION STANCE
negative
negative
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• Shapes should be curved, so round shapes Nothing square-like.
• ... So we shouldn’t have too square corners and that kind of
thing.
positive
Direct opinionOpinions towards
mutually exclusive option (alternative)
Discourse-level relations can provide More opinion information regarding the
stance
MOTIVATION:MORE INFORMATION ABOUT THE OPINION STANCE
negative
negative
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THIS WORK
Discourse-level relations
Overall stance classification
Expression-level (fine-grained) Opinion polarity classification
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64
THIS WORK
Discourse-level relations
Overall stance classification
Expression-level (fine-grained) Opinion polarity classification
Improve recognition of expression polarity Meeting dataLinguistic SchemeData Annotation Classifiers to recognize individual componentsGlobal inference to model interdependent interpretation of opinions in the discourse
Improve recognition of person’s overall stanceOnline debates and Web dataUnsupervised learning of relevant opinion relationsConcession handling to address specific discourse relations
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DISCOURSE-LEVEL RELATIONS
Opinion expressions are related in the discourse via
the relation between their targets [what the opinion is about] and whether / how the opinions contribute to an overall stance
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TARGET RELATIONS This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
positive
positive
positivenegative
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
TARGET RELATIONSpositive
positive
positivenegative
same
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
TARGET RELATIONSpositive
positive
positivenegative
alternative
same
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
DISCOURSE-LEVEL RELATIONS positive
positive
positivenegative
alternative
same
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
DISCOURSE-LEVEL RELATIONS positive
positive
positivenegative
alternative
samereinforcing
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
DISCOURSE-LEVEL RELATIONS positive
positive
positivenegative
alternative
samereinforcing
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
DISCOURSE-LEVEL RELATIONS positive
positive
positivenegative
alternative
samereinforcing
reinforcing
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DISCOURSE-LEVEL RELATIONS
The red remote is inexpensive, but the blue one is cool
The blue remote is cool, However, it is expensive
positivepositive
positive
negative
alternative
same
non-reinforcing
non-reinforcing
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This blue remote is cool. What’s more, the rubbery material is ergonomic.
I feel the red remote is a better choice. The blue remote will be too expensive.
DISCOURSE-LEVEL RELATIONS positive
positive
positivenegative
alternative
samereinforcing
reinforcing
<Pos, Pos, same>
<Pos, Neg, alternative>
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75
THIS WORK
Discourse-level relations
Overall stance classification
Expression-level (fine-grained) Opinion polarity classification
Improve recognition of expression polarity Meeting dataLinguistic SchemeData Annotation Supervised learning, feature engineeringGlobal inference to model interdependent interpretation of opinions in the discourse
Improve recognition of person’s overall stanceOnline debates and Web dataUnsupervised learning of relevant opinion relationsConcession handling to address specific discourse relations
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POLARITY TARGET PAIRS
Unsupervised Do not have target and discourse
relations between opinions annotated The data are on-line debates, in which
people largely reinforce their stances Our basic unit is the polarity-target
pair (computed automatically) Mine web data for reinforcing relations
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This blue remote is cool. What’s more, the rubbery material is
ergonomic. Blue remote -- positive
rubbery material -- positive
reinforcing
Find via web mining that these support the same stance
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DATA
Debate: iPhone vs. Blackberry
iPhone of course. Blackberry is now for the senior businessmen market! The iPhone incarnate the 21st century whereas Blackberry symbolizes an outdated technology. The iPhone can reach a very diversified clientele …
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DATA
Debate: iPhone vs. Blackberry
iPhone of course. Blackberry is now for the senior businessmen market! The iPhone incarnate the 21st century whereas Blackberry symbolizes an outdated technology. The iPhone can reach a very diversified clientele …
Arguing why their stance is correct
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DATA
Debate: iPhone vs. Blackberry
iPhone of course. Blackberry is now for the senior businessmen market! The iPhone incarnate the 21st century whereas Blackberry symbolizes an outdated technology. The iPhone can reach a very diversified clientele …
Alternatively, justifying why the opposite side is not good
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DATA
Debate: iPhone vs. Blackberry
iPhone of course. Blackberry is now for the senior businessmen market! The iPhone incarnate the 21st century whereas Blackberry symbolizes an outdated technology. The iPhone can reach a very diversified clientele …
Multiple positive opinions toward the iPhone reinforce a pro-iPhone stanceMultiple negative opinions toward the alternative further reinforce the pro-iPhone stance
Side Classification:
pro-iPhone stance
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http://www.convinceme.net/
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83
http://www.convinceme.net/
Side Classification:
pro-iPhone stanceSide Classification:
pro-Blackberry stance
Side Classification:
pro-iPhone stance
Topics:1. iPhone2. Blackberry
Sides/ Stances:1. Pro-iPhone2. Pro-Blackberry
Dual-topic, Dual-sided debates regarding Named Entities
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WEB MINING
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85
WEB MINING
Stance-1Pro-iPhone
Stance-2Pro-Blackberry
iPhone vs. Blackberry
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86
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone +
iPhone vs. Blackberry
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87
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry +
iPhone vs. Blackberry
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88
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - Blackberry +
Argue for a pro-iPhone stance via negative opinion towards the alternative target (Blackberry)
iPhone vs. Blackberry
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89
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Argue for a pro-iPhone stance via negative opinion towards the alternative target (Blackberry)
Argue for a pro-blackberry stance via negative opinion towards the alternative target (iPhone)
iPhone vs. Blackberry
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90
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Topic polarity pairs that reinforce a pro-iPhone stance
Topic polarity pairs that reinforce a pro-BB stance
iPhone vs. Blackberry
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91
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Target-1 + Target-2 + Target-3 -post
iPhone vs. Blackberry
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92
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Target-1 + Target-2 + Target-3 -post
iPhone vs. Blackberry
If these all mention the topic, the task is straightforward
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93
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Pearl + keyboard + battery -post
iPhone vs. Blackberry
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DEBATE TOPICS ARE EVOKED IN A VARIETY OF WAYS
Pro-blackberry The Pearl does music and video nicely … First, you still can't beat the full QWERTY keyboard for
quick, effortless typing.
Pro-iPhone Well, Apple has always been a well known company. Its MAC OS is also a unique thing.
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Pro-blackberry The Pearl does music and video nicely … First, you still can't beat the full QWERTY keyboard for
quick, effortless typing.
Pro-iPhone Well, Apple has always been a well known company. Its MAC OS is also a unique thing.
Type of Blackberry
Feature of Blackberry
Maker of iPhone
Feature of iPhone
DEBATE TOPICS ARE EVOKED IN A VARIETY OF WAYS
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Pro-blackberry The Pearl does music and video nicely … First, you still can't beat the full QWERTY keyboard for
quick, effortless typing.
Pro-iPhone Well, Apple has always been a well known company. Its MAC OS is also a unique thing.
Unique Aspects
DEBATE TOPICS ARE EVOKED IN A VARIETY OF WAYS
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iPhone and Blackberry, both Have e-mail facilities Can be used to take photos Operate on batteries Etc.
Both sides share aspects
SHARED ASPECTS
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Faster keyboard input
People expressing positive opinions regarding keyboards (generally) prefer Blackberry
SHARED ASPECTS - EXAMPLE
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Faster keyboard input
Certain shared aspects may be perceived to be better in one side•Keyboards in blackberry
Value for shared aspects depends on personal preferences•Music •KeyboardsPeople argue about what they value
SHARED ASPECTS
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keyboard+
SHARED ASPECTS
How likely is it to be used to reinforce a pro-iPhone stancepro-Blackberry stance
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101
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Pearl + keyboard + battery -post
iPhone vs. Blackberry
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102
WEB MINING
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Pearl + keyboard + battery -post
iPhone vs. Blackberry
Likelihood of Reinforcement associations
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ASSOCIATIONS WITH TOPIC-POLARITY
For each opinion-target (targetjp) calculate its
association with each of the opinion-topics P(topic1+|targetj+) P(topic1-|targetj+) P(topic2+|targetj+) P(topic2-|targetj+) P(iPhone+ |
email+)
P(iPhone- |email+)
P(BB+ |email+)
P(BB- |email+)
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METHODOLOGY: LEARNING ASSOCIATIONS
Web search engine
Debate title
Topic1 = iPhoneTopic2 = BB
Weblogs containing both topics Pa
rser Parsed web
documents
Opinion-target pairing
Lexicon
Syntactic Rules
I like email = email+
Associations with
topic-polarity
P(iPhone- |email+)
P(BB- |email+)
P(iPhone+ |email+)
P(BB+ |email+)
like = +hate = -
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Blackberry+
Blackberry-iPhone-
iPhone+
Keyboard+
0.72
0.0
0.16
0.12
Associations learnt from web data
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Blackberry+
Blackberry-iPhone-
iPhone+
Keyboard- 0.25
0.25
0.125
0.375
Associations learnt from web data
0.5 0.5
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FROM THE WEB MINING PHASE
Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Target-1 + Target-2 + Target-3 -post
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Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Target-1 + Target-2 + Target-3 -post
? ?
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Stance-1Pro-iPhone
Stance-1Pro-Blackberry
iPhone + Blackberry - iPhone -Blackberry +
Target-1 + Target-2 + Target-3 -post
Assume reinforcement unless detected otherwise
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Topic1+
Topic1-Topic2-
Topic2+
target+
Association of positive opinion towards a target to positive or negative opinions regarding either of the topics
Association Lookup
0.1
0.05
0.5
0.35
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Side-1 Side-2
Topic1+
Topic1-Topic2-
Topic2+
target+
Side-1 = Topic1+ alternatively Topic2-Side-2 =Topic2+ alternatively Topic1-
Association Lookup, Side Mapping
0.1
0.05
0.5
0.35
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target+Side-1 Side-2
0.150.85
Association of positive opinion towards a target to both of the stances
Association Lookup, Side Mapping
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NON-REINFORCING OPINIONS WITHIN THE POST
While the iPhone looks nice and does play a decent amount of music, it can't compare in functionality to the BB.
Concessionary opinions
Side Classification: pro-Blackberry
stance
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CONCESSION HANDLING
Detecting concessionary opinions Find Concession indicators
Discourse connectives from Penn Discourse Treebank (Prasad et al., 2007)
Use simple rules to find the conceded part of the sentence While the iPhone looks nice and does play a decent
amount of music, it can't compare in functionality to the BB.
I like my music, and phone, but I don't want to carry a brick around in my pocket when I only need my phone.
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Side-2Pro-Iphone
Side-1Pro-Blackberry
music+
phone+
1.0
0.5090.45
Original associations learnt from the web
CONCESSION HANDLING
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Side-2Pro-Iphone
Side-1Pro-Blackberry
music+
phone+
1.0
0.509 0.45
Associations after concession handling
Conceded opinions are counted for the opposite side
CONCESSION HANDLING
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Side-2Pro-Iphone
Side-1Pro-
Blackberry
Aggregation
target1+
target2+
target3+
target4+
Each opinion-target pair in the post has a bias toward one or the side
0.9
0.7
0.40.5
0.1
0.3
0.6
0.5
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Side-2Pro-Iphone
Side-1Pro-
Blackberry
Aggregation
target1+
target2+
target3+
target4+
Each opinion-target pair in the post has a bias toward one or the other sideAssign the side to the post which maximizes the association value of the post
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POLITICAL AND IDEOLOGICAL DEBATES
Many websites Controversial issues such as gun control,
healthcare, belief in God Topic is often a proposition or question
All health care should be free Should marriage for same-sex couples be legal? Does God really exist?
More complex and challenging than our product debate data
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TARGETS
More often, targets are clauses or entire sentences rather than simple NPs
The answer is greedy insurance companies that buy your Rep & Senator
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OPINIONS AND TARGETS
Often, opinions affect more than their immediate targets
The people are happy that Chavez has fallen (MPQA) Positive toward Chavez falling and negative
toward Chavez himself If there is a right to healthcare, you are stealing
the provision of that right from someone else Negative toward you and toward the right to
healthcare Public education is beset by exploding costs, and
deteriorating quality Negative toward costs, quality and, ultimately, the
state of public education
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MORE VARIATION
The personal beliefs associated with a side are more variable For example, in healthcare, some believe that
socialism and universal healthcare are equated, while others do not
In the product domains, in most cases there is some ground truth regarding the products and their features
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MANY OPEN PROBLEMS IN SUBJECTIVITY ANALYSIS
Complex discourse structure Non-literal language Irony and sarcasm Inferences and world knowledge
Good hard problems that should be around for a long time! Leora Morgenstern, AAAI Spring Symposium on NAME
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THANK YOU