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NEOS Interfaces to Bonmin

WWW Form & Sample Submissions


The NEOS Server offers Bonmin (Basic Open-source Nonlinear Mixed INteger programming) for the solution of mixed integer nonlinearly constrained optimization problems in AMPL format. Bonmin is also available open source under the Common Public License

Bonmin was developed by a large team of researchers at IBM and Carnegie Mellon:

  • Pierre Bonami,
  • Lorenz Biegler,
  • Andrew Conn,
  • Gerard Cornuejols,
  • Ignacio Grossmann,
  • Carl Laird,
  • Jon Lee,
  • Andrea Lodi,
  • Francois Margot,
  • Nicolas Sawaya, and
  • Andreas Waechter.

An introduction to Bonmin can be found on the Bonmin project home page at COIN-OR. Bonmin is a hybrid between two classical algorithms for mixed integer nonlinear programming: an outer-approximation-based branch-and-cut-based algorithm and a pure branch-and-bound algorithm. The user can set options to declare which version of the algorithm should be employed through NEOS.

Using the NEOS Server for Bonmin

The user must submit a model in AMPL format to solve a mixed integer nonlinearly constrained optimization problem. Examples of models in AMPL format can be found in the MINLP-AMPL library.

The model is specified by a model file, and optionally, a data file and a commands file. If the command file is specified it must contain the AMPL solve command.

Setting Options for Bonmin

Bonmin has a variety of options that can alter the algorithm behavior. The User's Manual for Bonmin describes all the solver options available to the user. There are two ways to set options to Bonmin though NEOS. First, the (AMPL) commands file can contain AMPL commands to set options for Bonmin. Second, the user can specify the name of a local options file bonmin.opt that will be used.

Printing directed to standard out is returned to the user with the output.

Enter the location of the ampl model (local file)
Model File:

Enter the location of the ampl data file (local file)
Data File:

Enter the location of the ampl commands file (local file)
Commands File:

Enter the location of the bonmin options file (local file)
Options File:


Dry run: generate job XML instead of submitting it to NEOS
Short Priority: submit to higher priority queue with maximum CPU time of 5 minutes
e-mail address:

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