Natural Language Processing (or NLP) Reading: Chapter 1 from Jurafsky and Martin, Speech and Language Processing: An Introduction to Natural Language Processing,

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Presentation transcript:

Natural Language Processing (or NLP) Reading: Chapter 1 from Jurafsky and Martin, Speech and Language Processing: An Introduction to Natural Language Processing, Computational Linguistics, and Speech Recognition (linked to class website)

Open the pod bay doors, HAL. Im sorry Dave, Im afraid I cant do that.

What is involved in NLP? Phonetics / Phonology: Recover sequence of words from audio signal. Open the pod bay doors, HAL.

What is involved in NLP? Phonetics / Phonology: Recover sequence of words from audio signal. Open the pod bay doors, HAL.

Text-To-Speech: Take a sequence of words and generate an audio signal. Im sorry Dave, Im afraid I cant do that.

Morphology: Recognize plurals, contractions, etc. Open the pod bay doors, HAL. Im sorry Dave, Im afraid I cant do that.

Syntax: Parse utterance Determine type of utterance (e.g., question, request, command) 1: Open the pod bay doors, HAL. Parses found: 1 [1] -| | -| | Open | | v: openv: open -| | | -| | -| | | | | | the | | | -| | | | | pod | | | n: podn: pod bay | | | n: bayn: bay -| | doors | | n: doorn: door -| |, , | | -| | | HAL..... | -|

Lexical Semantics: Determine meaning of component words 1: Open the pod bay doors, HAL. Parse Nr: 1 Open v: open 1. open, open_up -- (cause to open or to become open; "Mary opened the car door") pod n: pod 4. fuel_pod, pod -- (a detachable container of fuel on an airplane) bay n: bay 1. bay -- (an indentation of a shoreline larger than a cove but smaller than a gulf) doors n: door 1. door -- (a swinging or sliding barrier that will close the entrance to a room or building; "he knocked on the door"; "he slammed the door as he left")

Compositional semantics: Determine meaning from combination of these components. door action kind of applies to open applies to window kind of ingress kind of egress kind of

Pragmatics: Adapt phrasings to current situation, to accomplish goals. E.g., politeness: Im sorry Dave, Im afraid I cant do that.

Discourse: Conversational behavior follows conventions (dont interrupt, respond to requests and questions, etc.)

NLP does all this, plus dealing with ambiguity in language I made her duck Meanings?