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Semantics
Linguistic
Logical
Subfields
Computational
Lexical (lexis, lexicology)
Statistical
Structural
Topics
Analysis
Compositionality
Context (language use)
Prototype theory
Force dynamics
Semantic feature
Semantic gap
Theory of descriptions
Analysis
Latent
Computational
Machine-learning
Applications
Semantic file system
Semantic desktop
Semantic matching
Semantic parsing
Semantic similarity
Semantic query
Semantic Web
Semantic wiki
Semantics of programming languages
Types
Action
Algebraic
Axiomatic
Categorical
Concurrency
Denotational
Game
Operational
Predicate transformational
Theory
Abstract interpretation
Abstract semantic graph
Language
Linguistics
v
t
e
Latent semantic analysis (LSA) is a technique in natural language processing, in particular distributional semantics, of analyzing relationships between a set of documents and the terms they contain by producing a set of concepts related to the documents and terms. LSA assumes that words that are close in meaning will occur in similar pieces of text (the distributional hypothesis). A matrix containing word counts per document (rows represent unique words and columns represent each document) is constructed from a large piece of text and a mathematical technique called singular value decomposition (SVD) is used to reduce the number of rows while preserving the similarity structure among columns. Documents are then compared by cosine similarity between any two columns. Values close to 1 represent very similar documents while values close to 0 represent very dissimilar documents.[1]
An information retrieval technique using latent semantic structure was patented in 1988 (US Patent 4,839,853, now expired) by Scott Deerwester, Susan Dumais, George Furnas, Richard Harshman, Thomas Landauer, Karen Lochbaum and Lynn Streeter. In the context of its application to information retrieval, it is sometimes called latent semantic indexing (LSI).[2]
^Susan T. Dumais (2005). "Latent Semantic Analysis". Annual Review of Information Science and Technology. 38: 188–230. doi:10.1002/aris.1440380105.
^"The Latent Semantic Indexing home page".
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