Computer information retrieval using latent semantic structure via sketches

摘要

A method, system and program product for computer information retrieval is disclosed. A matrix A is received. Random sign matrices S and R are generated. Matrix products of S^T*A, A*R, and S^T*A*R are computed. A Moore-Penrose pseudoinverse C of S^T*A*R is computed. A singular value decomposition is computed of the pseudoinverse C. Three matrices ARU, Sigma, and V^TS^TA are outputted as factorization in applications.