ropt-nomad 0.9.0

A NOMAD plugin 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.

Development

The ropt-nomad source distribution can be found on GitHub. It uses a standard pyproject.toml file, which contains build information and configuration settings for various tools. A development environment can be set up with compatible tools of your choice.

The ropt-nomad package uses ruff (for formatting and linting), mypy (for static typing), and pytest (for running the test suite).