Pyomo 6.6.0

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

Changes in this release

• General
  • Remove pyomo check/pyomo.checker module (#2753)
  • Improve formatting of docstrings generated from ConfigDict (#2754)
  • Deprecate add_docstring_list (#2755)
  • Reapply black to previously completed directories (#2775)
  • Improve formatting for DeveloperError, MouseTrap messages (#2805)
• Core
  • Bugfix: component indexes specified as lists (#2765)
  • Remove the use of weakrefs in SymbolMap (#2791)
  • Improve conversions between Pyomo and Sympy expressions (#2806)
  • Rework expression generation to leverage multiple dispatch (#2722)
  • Improve robustness of calculate_variable_from_constraint() (#2812)
  • Add support for infix Boolean logical operators (#2835)
  • Improvements to Pyomo component iteration (#2829)
• Documentation
  • Copyright and Book Updates (#2750)
  • Link documentation in incidence_analysis README (#2759)
  • Update ReadtheDocs Configuration (#2780)
  • Correct import in community.rst (#2792)
  • Remove instructions for python <= 3.0 (#2822)
• Solvers Interfaces
  • NEOS: fix typo in kestrelAMPL.kill() argument (#2758)
  • Better handling of mutable parameters in HiGHS interface (#2763)
  • Improve linear data structure in NL writer (#2769)
  • Bugfix for shared named expressions in NL writer (#2790)
  • Resolve NPV constants in LinearExpressions in NL writer (#2811)
  • GAMS/Baron: ensure negative numbers are parenthesized (#2833)
  • Release LP version 2 (LPv2) writer (#2823, #2840)
• Testing
  • Rework Upload of Coverage Reports (#2761)
  • Update constant for visitor tests for python 3.11.2 (#2799)
  • Auto-Linting: Spelling Black Style Checker (#2800, #2818)
  • Skip MOSEK tests on NEOS (due to unknown NEOS error) (#2839)
• GDP
  • Add gdp.bound_pretransformation (#2824)
• Contributed Packages
  • APPSI: Improve logging consistency across solvers (#2787)
  • APPSI: Update available method in APPSI-Gurobi interface (#2828)
  • DoE: Release version 2 (#2794)
  • incidence_analysis: Remove strict usage of PyomoNLP (#2752)
  • incidence_analysis: Test IndexedBlock (#2789)
  • incidence_analysis: Use standard repn for incidence graph generation (#2834)
  • Parmest: Update for pandas 2.0.0 release (#2795)
  • piecewise: Add contrib.piecewise package (#2708, #2768, #2766, #2797, #2798,
    #2826)
  • PyNumero: Refactor CyIpopt interface to subclass cyipopt.Problem (#2760)
  • PyNumero: Fix CyIpopt interface when load_solutions=False (#2820)
  • PyROS: Fixes to PyROS Separation Routine (#2815)
  • PyROS: Fixes to Coefficient Matching and Timing Functionalities (#2837)