Pyomo 6.5.0

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 NL file writer (NLv2)
• Added support for Python 3.10, 3.11
• Removed support for Python 3.6
• 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)
  • PyROS (Pyomo Robust Optimization Solver)
  • Structural model analysis
  • Rewrite of the TrustRegion Solver

Changes in this release

• General
  • Apply black to enforce PEP8 standards in certain modules (#2737, #2738,
    #2733, #2732, #2731, #2728, #2730, #2729, #2720, #2721, #2719, #2718)
  • Add Developers' call information to README (#2665)
  • Deprecate pyomo.checker module (#2734)
  • Warn when infeasibility tools will not log output (#2666)
  • Separate identification from logging in pyomo.util.infeasible.log_* (#2669)
  • Convert subprocess timeout parameters to module attributes (#2672)
  • Resolve consistency issues in the Bunch class (#2685)
  • Remove GSL downloader from download-extensions (#2725)
  • Update enhancement GitHub issue template to link to wiki (#2739)
  • Add deprecation warning to pyomo command (#2740)
  • Require version= for all deprecation utilities (#2744)
  • Fix pyomo --version version string (#2743)
• Core
  • Fix minor typo: taht -> that in set.py (#2679)
  • Fix bugs in scaling transformation (#2678)
  • Rework handling of 'dimensionless' units in Pyomo (#2691)
• Solver Interfaces
  • Switch default NL writer to nlv2 and bug fixes (#2676, #2710, #2726)
  • Enable MOSEK10 warm-start flag and relocate var initialization (#2647)
  • Fix handling of POW in Baron writer (#2693)
  • Update GAMS license check to avoid exception when not available (#2697)
• Documentation
  • Fix incorrect documentation for sending options to solvers (#2688)
  • Fix Sphinx warnings (#2712)
  • Document Python Version Support policy (#2735)
  • Document deprecation and removal of functionality (#2741)
  • Document docstring formatting requirements (#2742)
• Testing
  • Skip failing Baron tests (#2694)
  • Remove residual nose references (#2736)
  • Update GHA setup-python version (#2705)
  • Improve GHA conda setup performance (#2701)
  • Add unit test for QCQO problems with MOSEK (#2682)
• DAE
  • Fix typo in __init__.py (#2683)
  • Add active filter to flattener (#2643)
• GDP
  • Add GDP-to-MIP transformation base class (#2687)
• Contributed Packages
  • DoE: New module for model-based design of experiments (#2294, #2711, #2527)
  • FBBT: Add tolerances to tests (#2675)
  • GDPopt: Switch a LBB test to use Gurobi as MINLP solver (#2686)
  • incidence_analysis: Add plot method to IncidenceGraphInterface (#2716)
  • incidence_analysis: Refactor to cache a graph instead of a matrix (#2715)
  • incidence_analysis: Add documentation and update API (#2727, #2745)
  • incidence_analysis: Add logging solve_strongly_connected_components (#2723)
  • MindtPy: Refactor to improve extensibility and maintainability (#2654)
  • Parmest: Suppress mpi-sppy output in import (#2692)
  • PyNumero: Add tee argument to Pyomo-SciPy square solvers (#2668)
  • PyNumero: Support implicit function solvers in ExternalPyomoModel (#2652)
  • PyROS: Fix user_time and wallclock_time bug (#2670)
  • PyROS: More judicious enforcement of PyROS Solver time limit (#2660, #2706)
  • PyROS: Update documentation (#2698, #2707)
  • PyROS: Adjust routine for loading DR polishing model solutions (#2700)
  • Viewer: Update to support PySide6 and display units and domain (#2689)