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CHAPTER Regular Expressions, Text Normalization, Edit Distance

Speech and Language Processing. Daniel Jurafsky & James H. Martin. Copyright 2021. Allrights reserved. Draft of December 29, ,TextNormalization, Edit DistanceUser: I am : DO YOU THINK COMING HERE WILL HELP YOU NOT TO BE UNHAPPYUser: I need some help, that much seems : WHAT WOULD IT MEAN TO YOU IF YOU GOT SOME HELPUser: Perhaps I could learn to get along with my : TELL ME MORE ABOUT YOUR FAMILYUser: My mother takes care of : WHO ELSE IN YOU FAMILY TAKES CARE OF YOUUser: My : YOUR FATHERUser: You are like my father in some (1966)The dialogue above is fromELIZA, an early natural language processing systemELIZA that could carry on a limited conversation with a user by imitating the responses ofa Rogerian psychotherapist (Weizenbaum, 1966).

2 CHAPTER 2•REGULAR EXPRESSIONS, TEXT NORMALIZATION, EDIT DISTANCE Some languages, like Japanese, don’t have spaces between words, so word tokeniza-tion becomes more difficult. lemmatization Another part of text normalization is lemmatization, the task of determining that two words have the same root, despite their surface differences.

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