Patent ID: 7788264

Claim:
A computer-implemented method for classifying documents each having zero or more links thereto, comprising: a. generating a link matrix; b. generating a document term matrix; c. jointly factorizing the document term matrix and the link matrix to classify the documents, wherein the link matrix is generated by matrix factorization to derive a feature representation Z of web pages based on analyzing a link matrix A, where said Z is an n×l matrix with each row being an l-dimensional feature vector of a web page; d. applying a factorization defined as: min Z , U ⁢  A - ZUZ T  F 2 + γ ⁢  U  F 2 + δ ⁢  Z  F 2 where F is a Frobius form, T is a transpose, U is a l×l full matrix, and γ and δ are positive numbers; and e. determining min V , Z ⁢  C - ZV T  F 2 + β ⁢  V  F 2 where C denotes content of web pages as a matrix whose rows represent documents and columns represent keywords, V denotes a latent space for words, and β is a positive number.