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Séparation de sources. Principes et algorithmes - Gretsi

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Algebraic tools Statistical tools Criteria Spatial whitening Tensors<br />

Decomposable tensor<br />

A dth or<strong>de</strong>r “<strong>de</strong>composable” tensor is the tensor product of d<br />

vectors:<br />

T = u ⊗ v ⊗ . . . ⊗ w<br />

and has coordinates Tij...k = ui vj . . . wk.<br />

may be seen as a discr<strong>et</strong>ization of multivariate functions whose<br />

variables separate:<br />

t(x, y, . . . , z) = u(x) v(y) . . . w(z)<br />

P.Comon & C.Jutten, Peyresq July 2011 BSS II.Tools and optimization criteria 48

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