Some issues in computing the CP decomposition of NonNegative Tensors
Résumé
Tensor decompositions are still in the process of study and development. In this paper, we point out a problem existing in nonnega-tive tensor decompositions, stemming from the representation of decom-posable tensors by outer products of vectors, and propose approaches to solve it. In fact, a scaling indeterminacy appears whereas it is not inherent in the decomposition, and the choice of scaling factors has an impact during the execution of iterative algorithms and should not be overlooked. Computer experiments support the interest in the greedy algorithm proposed, in the case of the CP decomposition.
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