Pyomo

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- General
- Remove URL and replace with full citation (3490)
- Rename project "pyomo" in setup.py [PEP 625] (3430)
- Resolve errors in `TeeStream` and `capture_output` (3497)
- Documentation
- Update autosummary for Sphinx 8.2.1 (3492)
- Resolve errors building documentation PDF (3495)
- Testing
- conda: disable '--update-deps' to work around buggy libffi(?) (3499)
- Update for March 2024 typos release (3500)
- Add timeout when installing optional packages (solvers) in conda (3501)
- Updates to CodeCov configuration (3491)
- Contributed Packages
- APPSI: Add warmstart for appsi_highs (issue 3450) (3494)

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- General
- Big Wheel of Misfortune - A Practice in Reviewing Old Issues (3460, 3473)
- Resolve buffering issues in `TeeStream` and `capture_output` (3449)
- Update GHA badges on README.md (3457)
- Fix incompatibility with `imp` and `DeferredImportCallbackFinder` (3444)
- Remove Python 3.8 Support (3438)
- Core
- Resolve error parenthesizing pow mantissa (3472)
- Resolve OSX error accessing closed filehandle (3467)
- Allow construction of CUID from another CUID (3464)
- Clean up `identify_variables` / `identify_mutable_parameters`;
deprecate `SimpleExpressionVisitor` (3436)
- Solver Interfaces
- Solver refactor: BUGFIX, f-string in contrib/solver (3481)
- Update Gurobi NL interface for Gurobi 12.x (3470)
- Defer starting the SAS session until needed (3448)
- Solver refactor: Validator for `tee` in `contrib.solver.config` (3482)
- Testing
- Pin Sphinx to not 8.2.0 (3479)
- Typos corrections (3437, 3474)
- Address intermittent TeeStream test failure (3465)
- 2025 Testing update: Black 25.1.0, testing Qt without X11 (3463)
- Testing: exclude Xpress 9.5.1 on Windows/GHA/Python3.{0,1} (3455)
- CY25 CI Infrastructure and typo fixes (3453)
- Verify we are testing all NEOS solvers (3433)
- Contributed Packages
- GDPOpt: Add Logic-Based Discrete-Steepest Descent Algorithm (3331)
- PyROS: Fix/Tweak Documentation and Solver Output Logging (3475)
- PyROS: Fix Treatment of Fixed Model Variables and Initialization of
Auxiliary Uncertain Parameters (3461)
- PyROS: Improve handling of separation problem sub-solver errors (3441)
- PyROS: Extend valid types for solver argument `uncertain_params` (3439)
- PyROS: Add Gaussian confidence level attribute to `EllipsoidalSet` (3434)

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- Core
- Resolve errors in mapping ScalarVar to numpy ndarray (3423)
- Documentation
- Update Documentation URLs (3425)
- Solver Interfaces
- Resolve error in xpress_direct interface retrieving reduced costs (3422)
- Testing
- Remove (unused) legacy test drivers (3427)

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"Annie"

SIGNIFICANT CHANGE NOTICE

- This will be the last release to support Python 3.8
- This is the first release to be tested against Python 3.13
- Complete reorganization of our online documentation (3382, 3378)

CHANGELOG

- General
- Add a 'Do not delete' Disclaimer to Issues/PR Templates (3361)
- Add URL Status Badge to README (3373)
- Resolve change in `InvalidNumber` handling in writers (3390)
- Update `common.timing` to make tests more deterministic (3397)
- Defer processing `ConfigValue`/`ConfigList` default until first use (3394)
- Improved support for moved/renamed/deprecated modules (3385)
- Fix `ConfigValue` initialization in multithreaded environments (3405)
- `ConfigDict`: prevent recursion on partially-constructed objects (3409)
- Fix bug in `AutoSlots` deepcopy (3412, 3413)
- Update `mpi4py_available` to work around `conda-forge/openmpi` (3416)
- Core
- Resolve bugs in `create_node_with_local_data` (3376)
- Resolve issue in filter/validate deprecation path (3368)
- Support `Param.pprint()` for non-finite Params (3387)
- Add (parameterized) linear programming dual transformation (3402)
- Documentation
- Autogenerate API documentation (3378)
- Add Alternative Solutions documentation (3370)
- Reorganize online documentation (3382)
- Fix broken doc URLs (3398)
- Improved autoenum documentation (3389)
- Reduce the number of formats built on readthedocs to avoid timeout (3404)
- Solver Interfaces
- Remove deprecated `gurobipy` `addConstr` call (3350)
- Update Xpress interfaces to support 9.5 (3392)
- Add support for templatized models in `gurobi_direct_v2` (3362)
- Update test for GAMS mapping 'infeasible or unbounded' to infeasible (3396)
- `XpressDirect.available()`: check there is a valid license (3400)
- Move away from dependence on gurobi.sh (3384)
- Fix error when xpress is imported before `xpress_direct` (3410)
- Testing
- Move URL Checker to Weekly Job (3360)
- Correct newly discovered typos (3365, 3399)
- Remove Octeract from NEOS solvers list (and other testing fixes) (3374)
- Guard tests against broken Gurobi licenses (3383)
- Remove pin to Gurobi 10.0.3 (3393)
- Add Python 3.13 to Testing Infrastructure (3401, 3419)
- Resolve `timeout()` failures on Windows/py3.13 (3415)
- GDP
- Fix performance degradation in hull transformation (3366)
- Contributed Packages
- DoE: Fix bug from using hardcoded value (3358)
- iis: Catch catastrophic solver failure when building MIS (3403)
- PyNumero: Reverse `BlockVector`/`MPIBlockVector` base class order (3380)
- PyNumero: Resolve incompatibilities with NumPy2 (3408)
- PyROS: Overhaul preprocessor subroutine and subproblem objects (3341)

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SIGNIFICANT CHANGE NOTICE

- Internal data storage for Constraint objects (see 3293)
- No longer release cythonized wheel for Python 3.11+ (see 3355)

CHANGELOG

- General
- Add ParameterizedQuadraticRepn and corresponding walker (3324)
- Update Pyomo for NumPy 2.0 compatibility (3292, 3353)
- Add ParameterizedLinearRepn and corresponding walker (3268)
- Update Release Process Workflow for changes in `pip` (3355)
- Core
- Handle uninitialized variable in `propagate_solution` of scaling
transformation (3275)
- Add `context` option to `SuffixFinder` (3348)
- Remove the `_suppress_ctypes` attribute from Block (3347)
- Improve `Set` initialization performance (3302)
- Update Constraint to only store the original expression (not
lower/body/upper) (3293)
- Kernel: fix bug in conic geomean (3310)
- Fix bug with IndexedSet objects and the within argument (3288)
- Support validate/filter for IndexedSet components using index (3338)
- Solver Interfaces
- Resolve NLv2 incompatibility with multithreading (3332)
- Resolve writer performance degradation (3343)
- Fix bug with inconsistent use of `result` and `results` (3337)
- LegacySolverWrapper: restore 'options' attribute (3334)
- Fix bug in XpressDirect._load_slacks (3318)
- NLv2: support expressions with nested external functions (3319)
- Ignore errors on ASL solver version check (3298)
- Add SAS solver interface (2886, 3309)
- Testing
- Omnibus testing / platform portability fixes (3335)
- Change BARON download URL (3328)
- Disable interface/testing for NEOS/octeract (3322)
- Fix typo in Jenkins driver (3312)
- Jenkins: update logic for recording variables (3311)
- Unpin Codecov / Update coverage (3303)
- GDP
- Don't transform known-to-be infeasible Disjuncts in multiple BigM (3314)
- Contributed Packages
- alternative_solutions: Add a new contrib package for generating
alternative solutions (3270)
- APPSI: Allow maingo_solvermodel to be imported without maingopy (3330)
- APPSI: Sort indices while removing constraints to fix bug in HiGHs
interface (3281)
- CP: Add beforeChild handling for bools in logical expressions (3315)
- DoE: Refactor to improve API and maintainability (3317)
- incidence_analysis: Raise error in `generate_strongly_connected_components`
instead of asserting (3305)
- parmest: Add missing main call for example file (3349)
- piecewise: Add incremental PW linear to MIP transformation (3287)
- piecewise: Add nonlinear-to-piecewise-linear transformation (3333)
- PyNumero: Support user-provided CyIpopt callbacks with 13 arguments (3289)
- PyNumero: Support PyomoNLP scaling factors on sub-blocks (3295)
- PyROS: Temporarily Adjust NL Writer Feasibility Tolerance (3280)
- viewer: Add option to specify the model by variable name (3271)

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- Core
- Deprecate `pyomo.core.plugins.transform.model.to_standard_form()` (3265)
- Reorder definitions to avoid `NameError` in some situations (3264)
- Solver Interfaces
- NLv2: Fix linear presolver with constant defined vars/external fcns (3276)
- Testing
- Add URL checking to GHA linting job (3259, 3261)
- Skip Windows Python 3.8 conda GHA job (3269)
- Contributed Packages
- DoE: Bug fixes for workshop (3267)
- viewer: Update guard for pint import (3277)

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