11. The non-transitory computer readable medium of claim 10 , wherein the method further comprises: determining a matrix T txk containing first k columns of T; determining a matrix S kxk containing an intersection of the first k rows and the first k columns of S; and determining a matrix Y comprised of a product of the matrix T txk and the matrix S kxk , wherein the product is a matrix of the weighted eigen vectors.
11. The non-transitory computer readable medium of claim 10 , wherein the method further comprises: determining a matrix T txk containing first k columns of T; determining a matrix S kxk containing an intersection of the first k rows and the first k columns of S; and determining a matrix Y comprised of a product of the matrix T txk and the matrix S kxk , wherein the product is a matrix of the weighted eigen vectors. 12. The non-transitory computer readable medium of claim 11 , wherein the method further comprises: determining a maximum absolute value in each row of the matrix Y associated with a term of the matrix X, wherein the maximum absolute value in each row represents a relevance of a corresponding term for the row; and the ranks of the terms in the matrix X include ranks determined from the maximum absolute values.