GAMSPy 1.9.0

Release Date: 09.04.2025

• General

  • Validate solver options for most of the solvers. It can be disable through VALIDATE_SOLVER_OPTIONS option.

  • get the value of objective estimation and the number of nodes used after frozen solves

  • Add description argument for model objects.

  • Make GAMSPy symbols non-iterable.

  • Inherit output argument from the container in solve function if the output argument is not specified.

  • Start the renaming process (deprecation) of model_instance_options to freeze_options. GAMSPy 1.9.0 will throw a warning. GAMSPy 1.10.0 will throw an exception, and GAMSPy 1.11.0 will remove model_instance_options altogether.

  • Fix sense=feasibility bug of frozen models.

  • Rename ModelInstanceOptions to FreezeOptions and add a warning for the usage of ModelInstanceOptions.

  • Add model.convert function to allow converting a GAMSPy model instance to different file formats.

  • Fix sense=feasibility bug of frozen models.

  • Fix static code analysis errors.

  • Do not validate equation definitions in case the container was restarted from a save file (.g00 file).

  • Propagate the output option of the container to model.freeze.

  • Raise warning in case the frozen solve is interrupted.

  • Improve the performance of symbol declarations without any records and declaration of 0 dimensional symbols with records.

• Documentation

  • Add additional instructions to deploy a GAMSPy/GAMS MIRO model.

  • Fix name mismatch between the argument name and the docstring of loadRecordsFromGdx function.

• Testing

  • Run all pre-commit hooks instead of running selectively.