Pyomo/pyomo 6.6.2

Pyomo 6.6.2

on GitHub

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

• ADVANCE CHANGE NOTICE

  • This will be the last release to support Python 3.7.

• General

  • Fall back on multiprocessing.dummy when multiprocessing.Pool is not
    available (#2890)
  • Clean up implicit function imports (#2892)
  • Ensure all pyomo modules import without warnings (#2897)
  • Resolve FileDownloader.get_os_version exception for missing
    lsb_release (#2911)
  • Improve calculate_variable_from_constraint error messages (#2914)
  • Add function for collecting expressions with unit inconsistencies (#2904)
  • Fix loading Scalar Param from .dat file (#2923)

• Core

  • Resolve kernel pickle/clone errors (#2916)
  • Reorganize numeric expression modules (#2909)
  • Resolve error categorizing some Var discrete domains as "integer" (#2954)
  • Named expressions: expr should always return NumericValue (#2948)
  • Support kwargs in partial objects passed to Initializer() (#2960)
  • Remove expr.current (#2910)

• Documentation

  • Fixing a 'that' vs. 'which' mistake in error about bounds crossing (#2950)
  • Add Explicit Linting Instructions to PR Template (#2947)
  • Update pyomo.common documentation (#2912)
  • Remove HTML4 Forcing in Online Docs (#2949)
  • Improved documentation for SOS (#2875)
  • Silence deprecation warnings (#2854)

• Solvers Interfaces

  • Resolve handling of {}**0 in Linear/QuadraticRepn (#2857)
  • Fix Linear/QuadraticRepnVisitor handling of {}**{float} (#2863, #2865)
  • GAMS: fix pickling models, update tests (#2913)
  • Xpress: fix NLP results processing for Xpress 9.2.0 (#2921)
  • Improve NaN handling in LP, NL writers (#2930)
  • Ensure constants written correctly to LP/NL files (#2953)

• Testing

  • Remove the 'singletest' job from "branches" builds (#2917)
  • Reactivate NEOS-MOSEK Tests (#2870)
  • New version of crate-ci/typos GitHub Actions (#2869, #2931)

• DAE

  • Improve error message when attempting to discretize models with circular
    references (#2943)

• GDP

  • Fixing a typo in gdp.hull transformation (#2915)
  • Add some more instances to the GDP constrained layout example (#2838)
  • Adding (reversible) gdp.transform_current_disjunctive_logic
    transformation (#2809)

• Contributed Packages

  • APPSI: change default behavior to not care where variables live (#2903)
  • APPSI: Correctly Process Objective Bounds from Gurobi for Nonconvex QCPs
    (#2898)
  • community_detection: fix networkx dependency in doctests (#2885)
  • cp: Fix bug with land in contrib.logical_to_disjunctive transformation
    (#2879)
  • DoE: Update tutorial notebook (#2889)
  • incidence_analysis: Filter variables with non-constant, fixed expressions
    that resolve to zero in get_incident_variables (#2882)
  • incidence_analysis: Correct behavior of linear_only argument in
    get_incident_variables (#2883)
  • MindtPy: Refactor to improve extensibility and maintainability (#2887)
  • PyNumero: Add PyNumeroEvaluationError (#2901)
  • PyNumero: Make min and max work with MPIBlockVector when some blocks have
    size 0 (#2896)
  • PyNumero: Remove old, unused PyNumero code (#2895)
  • PyNumero: Fix typo in docstring (#2873)
  • sensitivity_toolbox: Send lists to numpy.vstack rather than iterators
    (#2881)
  • viewer: Fix model viewer (#2924)