VIPR. Verifying Integer Programming Results
VIPR is new a software project to verify, in exact rational arithmetic, the correctness of results computed by mixed-integer linear programming solvers. It is based on an elementary file format for LP-based branch-and-cut certificates proposed in the article
This repository contains a detailed technical specification of the certificate file format, software to check, display, and compress certificate files, and supplementary information on the computational experiments conducted for the article above.
VIPR currently comes with three C++ programs:
viprchk: A program that verifies mixed-integer linear programming certificate files specified in the
viprttn: A program that tightens and improves .vipr files, potentially reducing their size and allowing for easier checking.
vipr2html: A program that converts
.viprcertificate files to a human readable HTML format (not recommended for large files).
The code should compile with most modern compilers supporting the C++11 standard. Directory
code provides a basic
makefile. We have successfully built the tools with GNU g++ version 5.4.0 under Ubuntu 16.04.4. It depends on the GNU Multiple Precision library.
File format specification
- Kevin K.H. Cheung, School of Mathematics and Statistics, Carleton University
- Ambros Gleixner, Department Optimization, Zuse Institute Berlin
- Daniel E. Steffy, Department of Mathematics and Statistics, Oakland University
Software for generating
We have created an extension of the exact rational version of the SCIP optimization software that is able to produce certificates of MIP results. It is currently under active development and is available by request from the authors of this project. It will be included in future releases of the SCIP software.