Pyomo Versions Save

• APPSI (Auto-Persistent Pyomo Solver Interfaces)
• External grey box models
• PyROS (Pyomo Robust Optimization Solver)
• Structural model analysis
• Rewrite of the TrustRegion Solver

• 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)

• 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)

• Fix bug in GLPK solver plugin (#2348)
• Update BARON solution parser (#2367)

• 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)

• Fix typo preventing a DAE test from running (#2349)

• 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)

• APPSI (Auto-Persistent Pyomo Solver Interfaces)
• External grey box models
• PyROS (Pyomo Robust Optimization Solver)
• Structural model analysis
• Rewrite of the TrustRegion Solver

• 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)

• Remove incomplete pyomo/core/base/alias.py module (#2284)
• Remove Python 3.6 support (#2312)

• Remove PICO solver interface (#2341)

• Add Windows pip single test (#2334)
• Fix test docstrings in piecewise to silence warnings (#2342)

• 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)

• APPSI (Auto-Persistent Pyomo Solver Interfaces)
• External grey box models
• PyROS (Pyomo Robust Optimization Solver)
• Structural model analysis
• Rewrite of the TrustRegion Solver

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)