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Speech and Language Processing: an Introduction to Natural Language Processing, Computational Linguistics, and Speech Recognition. Computational Lexical Semantics 19.1 Word Sense Disambiguation: Overview
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wodehouse, Pelham Grenville |
| Abstract | He was white and shaken, like a dry martini. This chapter introduces a series of topics related to computing with word meanings, or computational lexical semantics. Roughly in parallel with the sequence of topics in Ch. 18, we'll introduce computational tasks associated with word senses, relations among words, and the thematic structure of predicate-bearing words. We begin with word sense disambiguation, the task of examining word tokens in context and determining which sense of each word is being used. WSD is a task with a long history in computational linguistics, and as we will see, is a non-trivial undertaking given the somewhat elusive nature of many word senses. Nevertheless, there are robust algorithms that can achieve high levels of accuracy given certain reasonable assumptions. We next look at algorithms for computing relationships between words, with a particular focus on word similarity, and the hypernym, hyponym, and meronym WordNet relations introduced in Ch. 18. Relations such as these play important roles in applications such as question answering, natural language generation, automatic essay grading and plagiarism detection. Finally, we describe algorithms for semantic role labeling, also known as case role or thematic role assignment. These algorithms generally use information extracted from parses of the kind introduced in Ch. 12 to assign semantic roles such as AGENT, THEME and INSTRUMENT to the phrases in a sentence with respect to particular predicates. Our discussion of compositional semantic analyzers in Ch. 17 pretty much ignored the issue of lexical ambiguity. It should be clear by now that this is an unreasonable |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://plaza.ufl.edu/hfilip/jurafsky.martin19.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
