V2EX gomory-cut

Gomory Cut

释义 Definition

Gomory cut(戈莫里割/戈莫里切割平面):整数规划中常用的一类割平面(cutting plane)不等式。它从线性规划松弛(LP relaxation)的分数解出发,构造出一个对所有整数可行解都成立、但会切掉当前分数解的新约束,用于逐步收紧可行域、逼近整数最优解。(也常说 Gomory fractional cut;此外还有 Gomory mixed-integer cut 等变体。)

发音 Pronunciation (IPA)

/omi kt/

例句 Examples

We added a Gomory cut to eliminate the fractional solution.
我们加入了一条戈莫里割来去除分数解。

After solving the LP relaxation, the solver generated several Gomory cuts and then re-optimized to improve the integer bound.
在求解线性规划松弛后,求解器生成了多条戈莫里割,并重新优化以改进整数界。

词源 Etymology

该术语以美国数学家与运筹学家 Ralph E. Gomory(拉尔夫E戈莫里) 命名。他在 20 世纪 50 年代提出并系统化了用于整数规划的割平面思想,“Gomory cut”即指其代表性的割平面构造方法。

相关词 Related Words

  • Integer Programming
  • Mixed-Integer Programming
  • Linear Programming
  • Cutting Plane
  • Branch and Bound
  • LP Relaxation
  • Polyhedron
  • Simplex Method
  • 文学与经典出处 Literary Works

    • R. E. Gomory,《An Algorithm for Integer Solutions to Linear Programs》(1958,学术论文,首次系统提出相关割平面方法)
    • George L. Nemhauser & Laurence A. Wolsey,《Integer and Combinatorial Optimization》(教材/专著中讲解 Gomory cuts 与割平面法)
    • Laurence A. Wolsey,《Integer Programming》(专著中涵盖 Gomory fractional cuts 与相关理论)
    • Alexander Schrijver,《Theory of Linear and Integer Programming》(理论专著中讨论割平面与多面体方法,包括 Gomory cuts)
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