Pyomo 6.4.1

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
• Added support for Python 3.10
• Removed support for Python 3.6
• New packages:
  • APPSI (Auto-Persistent Pyomo Solver Interfaces)
  • External grey box models
  • PyROS (Pyomo Robust Optimization Solver)
  • Structural model analysis
  • Rewrite of the TrustRegion Solver

Changes in this release

• General
  • Extend linux distribution map logic (#2361)
  • Improve string processing in ConfigList, ConfigDict, and ListOf (#2360)
  • Update copyright assertion (#2368, #2378)
  • Deprecate name_buffer argument to getname (#2370)
  • Defer construction of the main Pyomo parser (#2385)
  • Improve error checking parsing ConfigDict string value (#2399)
• Core
  • Add indices to ComponentData objects (#2351)
  • Ignore SetOf, BuildAction, and BuildCheck when checking units (#2366)
  • Improve support for absolute value in differentiation and FBBT (#2347)
  • Allow relative tolerance when comparing unit dimensionality (#2395)
• Solver Interfaces
  • Fix bug in GLPK solver plugin (#2348)
  • Update BARON solution parser (#2367)
• Testing
  • Turn on failure for codecov-action (#2343)
  • Fixes to GHA due to updates to Ubuntu runner and Conda (#2356, #2384, #2396)
  • Update setup-python and pypy in GHA (#2364)
  • Pin version of openmpi used for testing (#2369)
• DAE Updates
  • Fix typo preventing a DAE test from running (#2349)
• Contributed Packages
  • APPSI: Minor improvements and generalizations (#2383, #2386, #2389, #2391, #2388, #2392)
  • incidence_analysis: Add option to ignore inequality constraints in IncidenceGraphInterface (#2350)
  • MC++: Update interface tests (#2400)
  • MindtPy: Add quadratic_strategy option to pass quadratic constraints or objectives to MIP solvers (#2338)
  • Parmest: Skip tests when seaborn and matplotlib are missing (#2394)
  • PyROS: Improve feasibility problem formulation, objective validation (#2353, #2371)

Pyomo 6.4.0

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
• Added support for Python 3.10
• Removed support for Python 3.6
• New packages:
  • APPSI (Auto-Persistent Pyomo Solver Interfaces)
  • External grey box models
  • PyROS (Pyomo Robust Optimization Solver)
  • Structural model analysis
  • Rewrite of the TrustRegion Solver

Changes in this release

• General
  • Distribute the ampl_function_demo C source / cmake files (#2319)
  • Add GitHub URL to setup.py for PyPI (#2325)
  • Use constant indentation for long lines in the HierarchicalTimer (#2336)
• Core
  • Remove incomplete pyomo/core/base/alias.py module (#2284)
  • Remove Python 3.6 support (#2312)
• Solver Interfaces
  • Remove PICO solver interface (#2341)
• Testing
  • Add Windows pip single test (#2334)
  • Fix test docstrings in piecewise to silence warnings (#2342)
• Contributed Packages
  • APPSI: Update Gurobi solver unavailable message (#2320)
  • APPSI: Remove distributables for Windows (#2326)
  • APPSI: Fix bugs when working with the Gurobi solution pool (#2335)
  • APPSI: Fix bug in persistent update for FBBT (#2340)
  • Preprocessing: Stop using polynomial_degree to check for linear and
    constant expressions (#2324)
  • PyNumero: Improve coverage of mpi block matrix tests (#2318)
  • PyNumero: Skip bound/domain validation in ExternalPyomoModel (#2323)
  • PyNumero: Remove deprecated useage of numpy.bool (#2339)
  • PyROS: Fix variable default initialization (#2331)

Pyomo 6.3.0

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
• Added support for Python 3.10
• New packages:
  • APPSI (Auto-Persistent Pyomo Solver Interfaces)
  • External grey box models
  • 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 3.6.

• General

  • Construct slices with normalized indices in slicing utility (#2223)
  • Remove hard-coded project name from default attempt_import() message (#2237)
  • Add --with-distributable-extensions option to setup.py (#2260)
  • Update Pyomo versioning to always include the micro version number (#2265)
  • Remove optional_packages from pyomo.environ (#2195)
  • Add Python 3.10 as an officially-supported interpreter (#2302)
  • TempfileManager updates (deletion order, add context) (#2297)
  • Add report_scaling utility to detect potential scaling issues (#2252)

• Core

  • Check Var bounds when setting values (#2196)
  • Fix bug in implicit Var construction (#2210)
  • Add support for user-defined Component List starting index (#2215)
  • Switch Var.value setter to validate values (#2214)
  • Overload component initializers with named keyword params (#2212, #2230)
  • Resolve errors when creating Reference to a scalar Set (#2229)
  • Standardize scalar-valued external function interfaces (#2231)
  • Resolve bugs in cloning _ImplicitAny domains (#2233)
  • Redesign Var.stale handling to use a global state flag (#2249)
  • Update differentiate() to accept string mode identifiers (#2266)
  • Add as_quantity: evaluate a Pyomo expression to a pint Quantity (#2222)
  • NPV_SumExpression to inherit from NPV_Mixin (#2209)
  • Add support for abs in numeric differentiation (#2232)
  • Search filesystem for AMPLExternalFunction library (#2305)

• Documentation

  • Updates to installation documentation (#2259)
  • Update GDP references (#2300)
  • Add example AMPL external function library (#2295)

• Solver Interfaces

  • Disable log file in gurobi_direct when keepfiles=False (#2203)
  • Remove old GLPK interfaces (#2256)
  • Support gurobi lp interface through gurobipy module (#2262)
  • Update CBC version identification (#2250)
  • Increase CBC timeout when getting version/asl compatibility (#2293)
  • Deprecate the Alias component (#2288)
  • Remove XPRESS interface (#2273)
  • Support string arguments in NL external functions (#2295)
  • Fix reversed NL operator codes for floor/ceil (#2216)

• Testing

  • Skip some fileutils tests on OSX Big Sur and Python<3.8 (#2224)
  • Fix Windows/Python 3.6 testing dependency (#2234)
  • Update test suite for BARON 22.1.19 (#2268)
  • Rework coverage uploads to use GitHub Actions (#2225)
  • Add option to test driver for turning off log capture (#2198)
  • Relaxing timing target for Windows GHA (#2303)
  • Resolve GDP test failure for missing solvers (#2306)
  • Testing infrastructure Refactor: nosetests to pytest (#2298)
  • Make time limit more robust for APPSI (#2296)
  • Resolve failing floating-point comparison failures in FBBT (#2244)
  • Check gurobipy availability in doctests (#2253)

• GDP Updates

  • Ensure gdp.fix_disjuncts always creates a fully algebraic model (#2263)
  • Add partition_disjuncts and between_steps transformations (#2221)

• Contributed Packages

  • APPSI: Fix bug with CBC options (#2243)
  • APPSI: Correctly identify changes to constraints (#2299)
  • APPSI: Improvements to persistent interface (#2246)
  • APPSI: Implement FBBT in C++ module (#2248)
  • APPSI: Resolve build errors on Windows (#2309)
  • GDPopt: Fix bugs in preprocessing (#2211)
  • GDPopt: Switch preprocessing to use FBBT (#2264)
  • incidence_analysis: General improvements (#2239, #2240)
  • MindtPy: Update online docs and logging (#2219, #2207)
  • MindtPy: Add Primal/Dual Integral (#2285)
  • MindtPy: Nonlinear sum reformulation of objective of MINLP (#2276)
  • Parmest: Covariance matrix (#2287), Add examples (#2274)
  • PyNumero: Add scaling factor support to ExternalPyomoModel (#2269)
  • PyNumero: Use projected NLPs for ExternalPyomoModel inner problems (#2283)
  • PyNumero: Add SQP example (#2291)
  • PyROS: Support ConstraintList and range constraints (#2206)
  • PyROS: Add optional bypassing of global separation subproblems (#2254)
  • TrustRegion: New implementation of Trust Region Framework (#2238, #2279)