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NATURAL LANGUAGE PROCESSING AN AI TASK DOMAIN
TASK DOMAINS OF AI Games Playing Expert Systems Natural Language Neural Networks Robotics
INTRODUCTION TO NLP What is NLP? “ The spirit is willing but the flesh is weak ” “ The vodka is good but the meat is rotten ” Why is NLP so hard? “ Is there water in the fridge..?” ELIZA
STEPS IN THE PROCESS OF DEVELOPING A NLP Morphological Analysis Syntactic Analysis Semantic Analysis Discourse Integration Pragmatic Analysis
FINITE STATE AUTOMATA
MORPHOLOGICAL ANALYSIS Morpheme Inflection
SYNTACTIC ANALYSIS Adequacy 1) Mathematical Adequacy 2) Notational Adequacy Limitations of FSA
CONTEXT FREE GRAMMARS Characteristics of CFG dealt with an example “They are flying planes” S -> NP VP VP -> verb_group NP VP -> verb NP verb_group -> aux verb NP -> pronoun NP -> noun NP -> adj noun adj -> flying aux -> are noun -> planes pronoun -> they verb -> are verb -> flying
TOP DOWN STRATEGY
BOTTOM UP SEARCH STRATEGY
SEMANTIC ANALYSIS Lexical Processing “ John saw Susan’s diamond shimmering from across the room” Lexical Ambiguity
DISCOURSE AND PRAGMATIC ANALYSIS “John had cold. His brother caught it” lpr/stuff.init
PRESENTED BY NAGINI INDUGULA (4/4 CSE) 98311A0515 Sree Nidhi Institute of Science and Technology Hyderabad
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