NEOS Server Home

NEOS Interfaces to L-BFGS-B

WWW Form & Sample Submissions


Solver L-BFGS-B (AMPL input) minimizes functions subject only to simple-bound constraints. It is based on L-BFGS-B by Ciyou Zhu, Richard Byrd, Peihuang Lu and Jorge Nocedal. L-BFGS-B is a limited memory BFGS algorithm which is suitable for solving large problems and does not require any structure in the objective function. Click here for pointers to more information on the algorithm implemented in L-BFGS-B.

Using the NEOS Server for L-BFGS-B (AMPL input)

The user must submit a model in AMPL format to solve a bound constrained optimization problem. Examples of models in AMPL format can be found in the netlib collection.

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.

The commands file can contain any AMPL command or set options for L-BFGS-B with, for example,
option lbfgsb_options "pgtol=10e-06 maxit=50";
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:


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:

By submitting a job, you have accepted the Terms of Use
Please do not click the 'Submit to NEOS' button more than once.

Submit comments and questions Terms of Use