ropt-nomad 0.2.0

A NOMAD backend for the ropt robust optimization package

A NOMAD optimizer plugin for ropt

This package installs a plugin for the ropt ensemble optimizer package, giving access to algorithms from the NOMAD optimization package.

Dependencies

This code has been tested with Python versions 3.8-3.11 on linux.

The backend requires the NOMAD optimizer, which will be installed as a dependency from PyPI.

Installation

From PyPI:

pip install ropt-nomad

Usage

An optimization by ropt using the plugin works mostly as any other optimization run (see also the ropt documentation). However, there are a few things to consider:

1. Gradients are not used, any specifications relating to gradient calculations in ropt are ignored.
2. Some standard optimization parameters that can be specified in the optimization section are ignored, specifically:
   • algorithm
   • tolerance
3. Only inequality constraints are supported by NOMAD.
4. Linear and non-linear constraints are both supported. Linear constraints are not supported directly, but are internally converted to non-linear constraints.
5. Additional options can be passed as a list of strings via the options field in the optimizer configuration. You can use any option that is supported by the NOMAD python interface, with the following exceptions:
   • The DIMENSION and cannot be overridden.
   • The MAX_ITERATIONS keyword can only be used if the max_iterations field is not set in the optimizer configuration.
   • BB_OUTPUT_TYPE can be overridden, which is useful to change the type of constraint handling.

Developement

The ropt-nomad source distribution can be found on GitHub. To install from source, enter the ropt-pymoo distribution directory and execute:

pip install .

Running the tests

To run the test suite, install the necessary dependencies and execute pytest:

pip install .[test]
pytest