Abstract
Finding the sparsest solutions to a tensor complementarity problem is generally NP-hard due to the nonconvexity and noncontinuity of the involved \(\ell _0\) norm. In this paper, a special type of tensor complementarity problems with Z-tensors has been considered. Under some mild conditions, we show that to pursuit the sparsest solutions is equivalent to solving polynomial programming with a linear objective function. The involved conditions guarantee the desired exact relaxation and also allow to achieve a global optimal solution to the relaxed nonconvex polynomial programming problem. Particularly, in comparison to existing exact relaxation conditions, such as RIP-type ones, our proposed conditions are easy to verify.
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Notes
More precisely, here the tensor should be called the hypermatrix. In physics and mechanics, tensors are geometric objects equipped with a transformation law that details how the components of the tensor respond to a change of basis, while hypermatrices are simply multi-dimensional arrays. However, for most papers in tensor decomposition (e.g., the survey paper [25] in SIAM Review, and the numerical optimization methods in [24] in Math. Programming), and in tensor complementarity problems (e.g., [34]), the word “tensors” is used for multi-dimensional arrays. We will then roughly use the word “tensors” throughout this paper.
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Acknowledgments
The authors would like to thank two anonymous referees and the associated editor for their valuable comments, and Mr. Weiyang Ding and Prof. Wei for the proof of Proposition 3 and their matlab codes of the Gauss-Seidel iteration method.
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This research was supported by the National Natural Science Foundation of China (11301022, 11431002), the State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University (RCS2014ZT20, RCS2014ZZ01), and the Hong Kong Research Grant Council (Grant No. PolyU 502111, 501212, 501913 and 15302114).
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Luo, Z., Qi, L. & Xiu, N. The sparsest solutions to Z-tensor complementarity problems. Optim Lett 11, 471–482 (2017). https://doi.org/10.1007/s11590-016-1013-9
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DOI: https://doi.org/10.1007/s11590-016-1013-9