Tightening a copositive relaxation for standard quadratic optimization problems
Tightening a copositive relaxation for standard quadratic optimization problems
复制标题
加强标准二次优化问题的共正松弛
DOI:
10.1007/s10589-012-9522-7
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发表时间:
2012-12
影响因子:
2.2
通讯作者:
D. Li
中科院分区:
文献类型:
--
作者:
Y. Xia;R.-L. Sheu;X. L. Sun;D. Li
We focus in this paper the problem of improving the semidefinite programming (SDP) relaxations for the standard quadratic optimization problem (standard QP in short) that concerns with minimizing a quadratic form over a simplex. We first analyze the duality gap between the standard QP and one of its SDP relaxations known as “strengthened Shor’s relaxation”. To estimate the duality gap, we utilize the duality information of the SDP relaxation to construct a graphG∗. The estimation can be then reduced to a two-phase problem of enumerating first all the minimal vertex covers ofG∗and solving next a family of second-order cone programming problems. When there is a nonzero duality gap, this duality gap estimation can lead to a strictly tighter lower bound than the strengthened Shor’s SDP bound. With the duality gap estimation improving scheme, we develop further a heuristic algorithm for obtaining a good approximate solution for standard QP.
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DOI:
10.1109/tit.1979.1056072
发表时间:
1979-07
期刊:
IEEE Trans. Inf. Theory
影响因子:
--
作者:
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通讯作者:
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影响因子:
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作者:
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作者:
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通讯作者:
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DOI:
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发表时间:
2002
期刊:
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影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
2005-06
期刊:
SIAM J. Discret. Math.
影响因子:
--
作者:
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通讯作者:
C. Luz;A. Schrijver