Blog Summarization

1
Blog Summarization

• Wang Xuan
• 10/01/08

2
Blog Summarization
System
100-word Summary
Query on opinion
3
Human Summary

• Find relevant information before perform
  summarization.
• Look for subjective information and discard
  information that expresses facts.
• Group relevant information
• for / against
• general / specific

4
General framework
Topic Relevance Module
Polarity Classification Module
Opinion Identification Module
Summary
Query on opinion
5
Sentiment Analysis

• Use Prior Polarity Lexicons
• Opinion Term
• Rare Term (sooo good)
• IU Term (I and You collocation)
• Adjective-Verb

6
Contextual Polarity

• Phrases in which word appears may be different
  from the words prior polarity
• No one thinks that it is good
• Not only good but amazing
• Environment trust vs. He won peoples trust
• Little threat

7
Sentiment Analysis

• Recognize Contextual Polarity
• Classify expression as neutral or polar
• Word itself (prior polarity)
• Preceded word, word functionality
• Sentence features
• Document topic
• Determine the polarity of the polar expression
• (Positive, Negative, Both, Neutral)
• Negated subject
• Preceded word, word functionality
• Polarity influencers (little threat, lack of
  understanding)

8
Future work

• Contextual Polarity Classification
• Summarization