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CHAPTER 17 Information Extraction

Speech and Language Processing. Daniel Jurafsky & James H. Martin. Copyright 2021. Allrights reserved. Draft of December 29, ExtractionI am the very model of a modern Major-General,I ve Information vegetable, animal, and mineral,I know the kings of England, and I quote the fights historicalFrom Marathon to Waterloo, in order and Sullivan,Pirates of PenzanceImagine that you are an analyst with an investment firm that tracks airline re given the task of determining the relationship (if any) between airline an-nouncements of fare increases and the behavior of their stocks the next day. His-torical data about stock prices is easy to come by, but what about the airline an-nouncements? You will need to know at least the name of the airline, the nature ofthe proposed fare hike, the dates of the announcement, and possibly the response ofother airlines.

2 CHAPTER 17•INFORMATION EXTRACTION Finally, many texts describe recurring stereotypical events or situations. The task template filling of template filling is to find such situations in documents and fill in the template slots. These slot-fillers may consist of text segments extracted directly from the text,

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