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CS4705 Natural Language Processing

CS4705 Natural Language Processing. Who am I?. Julia Hirschberg Computational Linguist in CS Focus: Spoken Language Processing Lab: The Speech Lab , CEPSR 7LW3-A Research: Deceptive speech Charismatic speech : Emotional speech : anger, uncertainty

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CS4705 Natural Language Processing

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  1. CS4705 Natural Language Processing CS 4705

  2. Who am I? • Julia Hirschberg • Computational Linguist in CS • Focus: Spoken Language Processing • Lab: The Speech Lab, CEPSR 7LW3-A • Research: • Deceptive speech • Charismatic speech: • Emotional speech: anger, uncertainty • Speech summarization: Broadcast News • Spoken Dialogue Systems: Games Corpus • `Translating Prosody’: English - Mandarin

  3. Is She Lying?

  4. What will we study in this course? • How can machines recognize and generate text and speech? • Why do we want them to? • Searching very large text and speech corpora: e.g. the Web • Translating between one language and another: e.g. Arabic and English • Summarizing very large amounts of text: e.g. your email • Building dialogue systems: e.g. Amtrak’s ‘Julie’

  5. “But I already know about language – I use it all the time…” • If you want to find all references to union activities in New York, what keywords do you specify? • Union…and…Unions? United? Uniform? Onion? • Activities…and…Activity? Active? Actor? Action? • Morphology: how words are composed of smaller units of meaning • If you want to make your email sound more literate, try varying your syntax without changing your semantics: • John hit Bill • Bill was hit by John (passive)

  6. Bill, John hit (preposing) • Who John hit was Bill (wh-cleft) • Semantics: the context-independent ‘meaning’ of words • Syntax: the way words are grouped together into larger constituents and phrases • If you want to find travel information about Nice, how do you avoid documents on ‘nice views’ in Puerto Rico? • Word Sense Disambiguation

  7. If you want to make sure you understand what your friend means when she says • Some people left the party early. • Bill doesn’t drink because he’s unhappy. • John called Bill a Republican and then he insulted him. • Pragmatics

  8. Bureaucracy • Instructor: Julia Hirschberg • (julia@cs.columbia.edu) • Office and hours: CEPSR 705, TBA • Teaching Assistant: Andrew Rosenberg • (amaxwell@cs.columbia.edu) • Office and hours: CEPSR 7LW1-A, TBA • Syllabus available at http://www1.cs.columbia.edu/~julia/cs4705/syllabus.html

  9. Text: Daniel Jurafsky and James H. Martin, Speech and Language Processing, Prentice-Hall, 2000 (available at CU Bookstore) Note errata available on website; check before reading each chapter please; note also that we have new versions of some chapters, available from our syllabus page • Check courseworks • Assignments: • 4 homework assignments • Midterm and final exams • Seven ‘free’ late days for homework assignments • You must get a CS account • Evaluation: 50% homework + 50% exams

  10. Academic Integrity Copying or paraphrasing someone's work (code included), or permitting your own work to be copied or paraphrased, even if only in part, is forbidden, and will result in an automatic grade of 0 for the entire assignment or exam in which the copying or paraphrasing was done. Your grade should reflect your own work. If you are going to have trouble completing an assignment, talk to the instructor or TA in advance of the due date please. Everyone: Read/write protect your homework files at all times.

  11. For Next Class • Look at syllabus • Read Chapters 1-2 of J&M • Questions?

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