Latent Semantic Indexing

• Deerwester, Dumais, Landauer, Furnas, and Harshman [JASIS 1990]

• Singular Value Decomposition

• Term-document matrix can be written as A=USVT

• U and V are left and right eigenvectors

  • UUT=VVT=1

• S=diag(s1…st) is eigenvalues (diagonal)

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