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Cramér-Rao-Induced Bounds for CANDECOMP/PARAFAC Tensor Decomposition

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3 Author(s)
Tichavsky, P. ; Institute of Information Theory and Automation, Prague 8, Czech Republic ; Phan, A.H. ; Koldovsky, Z.

This paper presents a Cramér-Rao lower bound (CRLB) on the variance of unbiased estimates of factor matrices in Canonical Polyadic (CP) or CANDECOMP/PARAFAC (CP) decompositions of a tensor from noisy observations, (i.e., the tensor plus a random Gaussian i.i.d. tensor). A novel expression is derived for a bound on the mean square angular error of factors along a selected dimension of a tensor of an arbitrary dimension. The expression needs less operations for computing the bound, $O(NR^{6})$, than the best existing state-of-the art algorithm, $O(N^{3}R^{6})$ operations, where $N$ and $R$ are the tensor order and the tensor rank. Insightful expressions are derived for tensors of rank 1 and rank 2 of arbitrary dimension and for tensors of arbitrary dimension and rank, where two factor matrices have orthogonal columns.

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Signal Processing, IEEE Transactions on  (Volume:61 ,  Issue: 8 )