说明：  Given an instantaneous mixture of some source signals, the blind signal separation (BSS) problem consists of the identification of both the mixing matrix and the original sources. By itself, it is a non- unique matrix factorization problem, while unique solutions can be ob- tained by imposing additional assumptions such as statistical indepen- dence. By mapping the matrix data to a tensor and by using tensor decompositions afterwards, uniqueness is ensured under certain condi- tions. Tensor decompositions have been studied thoroughly in literature. We discuss the matrix to tensor step and present tensorization as an important concept on itself, illustrated by a number of stochastic and deterministic tensorization techniques.