Semantic Knowledge Discovery, Organization and Use

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Semantic Knowledge Discovery, Organization and Use
Semantic Knowledge is crucial to understand human
language Russian Senator Mikhail Slonimsky was
kidnapped on 3 May. The Moscow politician had
left his house with his van at 7am. A few minutes
later, three heavily armed men forced him to get
out of his car and get into a blue Renault.
The system has to use a lot of semantic knowledge
to understand thatthree heavily armed menare
the perpetrators of the abduction
Prof. Satoshi Sekine http//nlp.cs.nyu.edu/sekine
NYU Proteus Project
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• Types of Semantic knowledge
• Synonym (kidnap and abduct)
• Hypernym-hyponym (car and van)
• Part-of relations (Russia and Moscow)
• Paraphrase, Textual entailment (force him out of
  his car and kidnap)
• Relation between things
• (perpetrator kidnaps victim)
• Relation between events (kidnapping
• scenario includes capturing the victim)
• NE instances (Renault is a car name)
• How to create this knowledge??
• Discover from large text corpora(Web, newspaper)
  by collocation, frequency, context, statistics,
  linguistics, and more

A snapshot of Ngram Search Engine Getting
contexts of was kidnapped by in less than a
second from 3 billion words of text