Columbia COMS W4705 - Natural Language Processing (18 pages)

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Natural Language Processing



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Natural Language Processing

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Pages:
18
School:
Columbia University
Course:
Coms W4705 - Natural Language Processing

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Natural Language Processing Julia Hirschberg COMS 4705 Fall 2010 CS 4705 What is Natural Language Processing Software that can recognize analyze and generate text and speech AKA computational linguistics At Columbia Michael Collins CS parsing machine translation Mona Diab CCLS semantics Nizar Habash CCLS morphology machine translation Julia Hirschberg CS spoken language processing Kathy McKeown CS summarization generation Becky Passonneau CCLS dialogue systems reference resolution Owen Rambow CCLS syntax parsing Why is NLP hard Some Headlines Something Went Wrong In Jet Crash Expert Says Police Begin Campaign To Run Down Jaywalkers Drunk Gets Nine Months In Violin Case Farmer Bill Dies In House Iraqi Head Seeks Arms Enraged Cow Injures Farmer With Ax Stud Tires Out Eye Drops Off Shelf Teacher Strikes Idle Kids Squad Helps Dog Bite Victim What will we learn about in this course Morphology the way words are formed Syntax the way words are grouped together into larger constituents and phrases and the way these phrases can be ordered Semantics the context independent meaning of utterances Pragmatics the context dependent meaning of utterances Goal What is a speaker writer meaning to convey Morphology Stud tires out Is stud an adjective or a noun tires a noun or a verb Internet search union activities in New York What to look for Union unions activities activity Active Action Actor Actual Academic New vs New York York vs yorkie Syntax Constituent Structure Teacher Strikes Idle Kids Enraged Cow Injures Farmer With Ax Word Order and Position and Meaning John hit Bill Bill was hit by John Bill John hit Who John hit was Bill I said John hit Bill John hits Bill Semantics Word meaning semantic roles John picked up a bad cold John picked up a large rock John picked up Radio Netherlands on his radio Is meaning compositional Squad helps dog bite victim Enraged cow injures farmer with ax Pragmatics Going Home a play in one act thanks to Bonnie Dorr Scene 1 Pennsylvania Station NY



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