Pyomo/pyomo 6.7.2

Pyomo 6.7.2

on GitHub

Highlight of the 6.7 release series

• Added support for Python 3.12
• Removed support for Python 3.7
• New writer for converting linear models to matrix form
• Improved handling of nested GDPs
• Redesigned user API for parameter estimation
• New packages:
  • iis: new capability for identifying minimal intractable systems
  • latex_printer: print Pyomo models to a LaTeX compatible format
  • contrib.solver: preview of redesigned solver interfaces
  • simplification: simplify Pyomo expressions
• New solver interfaces
  • MAiNGO: Mixed-integer nonlinear global optimization
• ...and of course numerous minor bug fixes and performance enhancements

Changes in this release

• General
  • Support config domains with either method or attribute domain_name (#3159)
  • Automate TPL callback registrations (#3167)
  • Fix type registrations for ExternalFunction arguments (#3168)
  • Only modify module path and spec for deferred import modules (#3176)
  • Add "mixed" standard form representation (#3201)
  • Support "default" dispatchers in ExitNodeDispatcher (#3194)
  • Redefine objective sense as a proper IntEnum (#3224)
  • Fix division-by-0 bug in linear walker (#3246)
• Core
  • Allow Var objects in LinearExpression.args (#3189)
  • Add type hints to components (#3173)
  • Simplify expressions generated by TemplateSumExpression (#3196)
  • Make component data public classes (#3221, #3253)
  • Exploit repeated named expressions in identify_variables (#3190)
• Documentation
  • NFC: Add link to the HOMOWP companion notebooks (#3195)
  • Update installation documentation to include Cython instructions (#3208)
  • Add links to the Pyomo Book Springer page (#3211)
• Solver Interfaces
  • Fix division by zero error in linear presolve (#3161)
  • Subprocess timeout update (#3183)
  • Solver Refactor - Bug fixes for various components (#3181, #3214, #3228)
  • NLv2: handle presolved independent linear subsystems (#3193)
  • Update LegacySolverWrapper compatibility with the pyomo script (#3202)
  • Fix mosek_direct to use putqconk instead of putqcon (#3199)
  • Check _skip_trivial_constraints before the constraint body (#3226)
  • Fix AMPL solver duplicate funcadd (#3206)
  • Disable the use of universal newlines in the ipopt_v2 NL file (#3231)
  • NLv2: fix reporting numbers of nonlinear discrete variables (#3238)
  • Fix: Get SCIP solving time considering float number with some text (#3234)
  • Solver Refactor - Add gurobi_direct implementation (#3225)
• Testing
  • Update TPL package list due to contrib.solver (#3164)
  • Set maxDiff=None on the base TestCase class (#3171)
  • Testing infrastructure updates (#3175)
  • Typos update for March 2024 (#3219)
  • Add openmpi to testing environment to resolve issue in mpi4py (#3236, #3239)
  • Skip black 24.4.1 due to a bug in the parser (#3247)
  • Skip tests on draft and WIP pull requests (#3223)
  • Update GHA to grab gurobipy from PyPI (#3254)
• GDP
  • Use private_data for all original / transformed component mappings (#3166)
  • Fix a bug in gdp.bigm transformation for nested GDPs (#3213)
• Contributed Packages
  • APPSI: cmodel: handle non-mutable params in var / constraint bounds (#3182)
  • APPSI: Allow APPSI FBBT to handle nested named Expressions (#3185)
  • APPSI: Add MAiNGO solver interface (#3165)
  • CP: Add SequenceVar and other logical expressions for scheduling (#3227)
  • DoE: Bug fixes (#3245)
  • iis: Add minimal intractable system infeasibility diagnostics (#3172)
  • incidence_analysis: Improve solve_strongly_connected_components
    performance for models with named expressions (#3186)
  • incidence_analysis: Add function to plot incidence graph in
    Dulmage-Mendelsohn order (#3207)
  • incidence_analysis: Require variables and constraints to be specified
    separately in IncidenceGraphInterface.remove_nodes (#3212)
  • latex_printer: bugfix for set operations / multidimensional sets (#3177)
  • MindtPy: Add HiGHS support (#2971)
  • MindtPy: Add call_before_subproblem_solve callback (#3251)
  • Parmest: New UI using experiment lists (#3160)
  • piecewise: Add piecewise linear transformations (#3036)
  • preprocessing: bugfix: intersect domains in variable aggregator (#3241)
  • PyNumero: Allow CyIpopt to solve problems without objectives (#3163)
  • PyNumero: Work around bug in CyIpopt 1.4.0 (#3222)
  • PyNumero: Include "inventory" in readme (#3248)
  • PyROS: Simplify custom domain validators (#3169)
  • PyROS: Fix iteration logging for edge case involving discrete sets (#3170)
  • PyROS: Update solver timing system (#3198)
  • simplification: expression simplification using GiNaC or SymPy (#3088)