RELEASE.md

We are pleased to announce the release of Pyomo 6.6.1.

Pyomo is a collection of Python software packages that supports a diverse set of optimization capabilities for formulating and analyzing optimization models.

The following are highlights of the 6.0 release series:

• Improved stability and robustness of core Pyomo code and solver interfaces
• Integration of Boolean variables into GDP
• Integration of NumPy support into the Pyomo expression system
• Implemented a more performant and robust expression generation system
• Implemented a more performant NL file writer (NLv2)
• Implemented a more performant LP file writer (LPv2)
• Applied PEP8 standards throughout the codebase
• Added support for Python 3.10, 3.11
• Removed support for Python 3.6
• Removed the pyomo check command
• New packages:
  • APPSI (Auto-Persistent Pyomo Solver Interfaces)
  • CP (Constraint programming models and solver interfaces)
  • DoE (Model based design of experiments)
  • External grey box models
  • IIS (Standard interface to solver IIS capabilities)
  • MPC (Data structures/utils for rolling horizon dynamic optimization)
  • piecewise (Modeling with and reformulating multivariate piecewise linear functions)
  • PyROS (Pyomo Robust Optimization Solver)
  • Structural model analysis
  • Rewrite of the TrustRegion Solver

A full list of updates and changes is available in the CHANGELOG.md.

Enjoy!

• Pyomo Developer Team
• [email protected]
• https://www.pyomo.org

About Pyomo

The Pyomo home page provides resources for Pyomo users:

• https://www.pyomo.org

Detailed documentation is hosted on Read the Docs:

• https://pyomo.readthedocs.io/en/stable/

Pyomo development is hosted at GitHub:

• https://github.com/Pyomo

Get help at:

• StackOverflow: https://stackoverflow.com/questions/tagged/pyomo
• Pyomo Forum: https://groups.google.com/group/pyomo-forum/