Topic: Opinion Extraction and Summarization

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Topic Opinion Extraction and Summarization
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Opinion Extraction and Summarization

• What follows perspective of Cardie, Riloff,
  Wiebe
• We can see similar themes in others work as well

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Information Extraction from Text
After a brief lull, the avian flu is on the march
again through Fraser Valley poultry farms.
The Canadian Food Inspection Agency says ongoing
surveillance efforts have led to the detection of
bird flu on 36 commercial premises.
The agency says it is continuing depopulation
efforts on infected farms on a priority basis.
OUTBREAK Disease Victims Location Country Stat
us Containment
/ bird flu
/ 36
commercial premises Canada confirmed
avian flu poultry Fraser Valley
poultry farms
depopulation
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Information Extraction of Events
Extracting facts and entity relations associated
with events of interest.
Terrorist incidents perpetrators, victims,
physical targets, weapons, date, location
Disease outbreaks disease, organisms, victim,
symptoms, location, country, date, containment
measures
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3 chickens died from avian flu.
3 chickens died from avian flu. SUBJ VP
PP
Fact DEATH Victim 3 chickens Disease avian
flu
3 chickens died from avian flu. The birds were
found in Canada.
Event Outbreak Victim 3 chickens / the
birds Disease bird flu Country Canada
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Subjectivity opinions, emotions, motivations,
speculations, sentiments

• Information Extraction of
• NL expressions
• Components
• Properties

Angolans are terrified of the Marburg virus
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Fine-grained Opinions
Australian press has launched a bitter attack on
Italy after seeing their beloved Socceroos
eliminated on a controversial late penalty.
Italian coach Lippi has also been blasted for his
comments after the game. In the opposite camp
Lippi is preparing his side for the upcoming game
with Ukraine. He hailed 10-man Italy's
determination to beat Australia and said the
penalty was rightly given.
Stoyanov Cardie, 2006
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Fine-grained Opinion Extraction
The Australian Press launched a bitter attack on
Italy
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Opinion Summary
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Summarization of Opinions Events