vOptLib (short for vector optimization library) is a collection problem instances for benchmarking multi-objective solvers. It covers a variety of Multiobjective linear optimization problems (multiobjective combinatorial problems, multiobjective integer linear programs, multiobjective mixed integer programs).
Available online since 1998, and redesigned in 2017, the repository is currently maintained by Xavier.Gandibleux@univ-nantes.fr and Anthony.Przybylski@univ-nantes.fr If you have produced your own instances and you would like to become contributor to vOptLib with your collection, please do not hesitate to contact us.
12-Jul-2021: instances of set partitioning problem uploaded 02-Sep-2017: moved from gitlab to here (repository on gitlab will be closed soon) 05-May-2017: New repository launched.
vOptLib is organized in structured and non-structured problems. It distinguishes the following problem classes:
Multi-objective structured problems
Several linear objectives; feasible region is a polyhedron with a structure; all variables are restricted to be binary.
Uncapacited binary facility location problem (UBFLP)
Single source capacited facility location problem (SSCFLP)
Several linear objectives; feasible region is a polyhedron with a structure; some but not all of the variables are restricted to be integer.
Uncapacited mixed facility location problem (UMFLP)
Capacited facility location problem (CFLP)
Multi-objective non-structured problems
Several linear objectives; feasible region is a polyhedron; all variables are restricted to be integer.
Several linear objectives; feasible region is a polyhedron; some but not all of the variables are restricted to be integer.
The following instances can be downloaded and used for free. If you use them for your research, we would appreciate a reference to vOptLib in your publication.
Created in 1998 and available online since, the library -originaly named MCDMlib and later the MOCOlib- was dedicated to MultiObjective Combinatorial Optimization problems. It is referenced from:
Amongst the instances available, the library hosts instances used by us during the following research projects:
The obsolete (but active) URLs are:
If you are aware of the existence of a collection available online that is not listed here, please do not hesitate to contact us for adding a link to it.