Our last choice is based on a less constrained form of matrix factorization where T is decom-posed into two matrices in such a way that U m, n. U and V are obtained by minimizing the following expression: where the first term minimizes the reconstruction error of T by the product U • V while the second term is a regularization term, controlled by the parameter λ for avoiding overfitting.
table 2 also shows that there is still room for improvement for reaching the level of the initial thesaurus t cnt .