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Has anyone encountered scalable solutions to a binary linear optimization problem of the form:

\begin{align*} &\min \sum_{i=1}^n x_i\\ &\ \text{s.t}\quad x_i \in \{0,1\}\\ &\qquad Ax=b \end{align*}

where $x=(x_1,x_2,...,x_n)^t$, $b=(b_1, b_2,...,b_m)^t$, $b_i$ are positive integers and $A$ is a very sparse matrix with entries $0$ or $1$.

By scalable I mean solution that handles large values of $n$ and multiple constraints ($m$).

Thank you!

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2 Answers 2

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If the matrix A is totally unimodular, the LP-relaxation has an integer solution. In general, the problem is NP-hard.

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When vector b is all-one, this problem is called Set Partioning. Positive weights can be used in the objective funtion, and this has applications e.g. in airline crew scheduling problems. The problem is NP-hard. You can find more information on this page.

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