PGAPack

PGAPack was developed by David Levine of the Mathematics and Computer Science Division at Argonne National Laboratory. The PGAPack AMPL interface was developed by Ismael Vaz in order to benchmark the PSwarm solver with a set of problems.

PGAPack makes no use of derivative information of the objective function (so modest problem size should be submitted).

For further information about PGAPack interface to AMPL, contact aivaz@dps.uminho.pt.

For further information about PGAPack contact the PGAPack author.

Using the NEOS Server for PGAPack

AMPL input

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 ASA with, for example,

option pgapack_options "maxfun=1000";

Options include any of the parameters

• crossover - PGASetCrossoverType (1=ONEPT, 2=TWOPT, 3=INIFORM)
• debug_level - PGASetDebugLevel (12=ENTERED, 13=EXIT, 80=MALLOC, 82=PRINTVAR, 22=SEND, 23=RECV)
• fitness - PGASetFitnessType (integer)
• ga_iter_value - PGASetMaxGAIterValue (integer)
• maxfun - Maximum number of objective function calls (integer)
• mutation - PGASetMutationType (1=RAW, 2=NORMAL, 3=RANKING)
• num_replace_value - PGASetNumReplaceValue (integer)
• pop_rep - PGASetPopReplaceType (1=BEST, 2=NOREP, 3=REP)
• pop_size - PGASetPopSize (integer)
• selection - PGASetSelectType (1=PROPOR, 2=SUS, 3=TOUR, 4=PTOU)

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

Using the NEOS Server for PGAPack/AMPL

The user must submit a model in AMPL format. Examples are provided in the examples section of the AMPL website.

The problem must be specified in a model file. A data file and commands files may also be provided. If the commands file is specified, it must contain the AMPL solve command; however, it must not contain the model or data commands. The model and data files are renamed internally by NEOS.

The commands file may include option settings for the solver. To specify solver options, add

  option pgapack_options 'OPTIONS';