PPT-Lexical Semantics and Word Senses

Hongning Wang CSUVa Todays lecture Lexical semantics Meaning of words Relation between different meanings WordNet An ontology structure of word senses Similarity between words Distributional semantics. Reference. :. Humphrey, S., Love, K., & . Droga. , L. (2011). . Working Grammar: An introduction for secondary English teachers. . Victoria: Pearson.. Lexical cohesion - definitions . Lexical. : (adjective) = the words of a language. CSCI-GA.2590 – Lecture 7A. Ralph . Grishman. NYU. Words and Senses. Until now we have manipulated structures based on words. But if we are really interested in the meaning of sentences, we must consider the . Slides adapted from Dan Jurafsky, Jim Martin and Chris Manning. Three Perspectives on Meaning. Lexical Semantics. The meanings of . individual words. Formal Semantics. (or Compositional Semantics or Sentential Semantics). Hira. . Waseem. Lecture. hirawaseem.mscs20@students.mcs.edu.pk. The Role of the Lexical Analyzer. As the first phase of a compiler, the main task of the lexical analyzer is . to read . the input characters of the source program, group them into lexemes, . lexical representations: . a . variationist. perspective . Gregory R. Guy. phonoLAM. group. July 2013. The problem of lexical scope. Some phonological generalizations are valid . only for . a subset of the lexicon . Text-to-Scene Generation. 1. Bob Coyne (. coyne@cs.columbia.edu. ). Owen . Rambow. (. rambow@ccls.columbia.edu. ). . Richard . Sproat. (. rws@xoba.com. ). Julia Hirschberg (. julia@columbia.edu. ). lexical analyzer. parser. symbol table. source program. token. get next token. Important Issue: . . What are Responsibilities of each Box ?. Focus on Lexical Analyzer and Parser. 2. Why to separate Lexical analysis and parsing. CSCI-GA.2590 – Lecture 7A. Ralph . Grishman. NYU. Projects. Start thinking about possibilities. probabilistic models of additional stages. sentence splitter. coreference. dependency parsing. prepositional phrase attachment. A branch of linguistics dealing with the study of meaning, including the ways meaning is structured in language and changes in meaning and form over time . (Random House Webster’s Dictionary). Semantics, roughly defined, is the study of meaning. Omer Levy. . Ido. Dagan. Bar-. Ilan. University. Israel. Steffen Remus Chris . Biemann. Technische. . Universität. Darmstadt. Germany. Lexical Inference. Lexical Inference: Task Definition. Dan Jurafsky. Stanford University. Introduction and Course Overview. What is Computational Lexical Semantics. Any computational process involving word meaning!. Computing . Word Similarity . Distributional (Vector) Models of . The semantic field theory. The semantic field theory was brought into its puberty by German scholar J. Trier in the . 1930. s, whose version is seen as a new phase in the history of semantics. What has now come to be known as the theory of semantic fields (or field-theory) was first put forward as such by a member of German and Swiss scholars in the 1920s and 1930s. . 5.3.3 Polysemy vs. homonymy. In lexical ambiguity there are traditionally two types : . Polysemy. . : one word with multiple senses ​.. ​. Homonymy. : different words that happen to sound the same.. Structuralism is a very general movement , . general movement, or attitude, in twentieth-century thought, which has influenced many academic disciplines. It has been especially influential in the social sciences and in linguistics, semiotics and literary criticism.