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CHANGELOG.txt
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===============
Pyomo CHANGELOG
===============
-------------------------------------------------------------------------------
Current Development
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
Pyomo 5.6.8 13 Dec 2019
-------------------------------------------------------------------------------
- General
- Fix collections imports for Python 3.x (#1175)
- Add verbose logging options for infeasibility testing (#1207)
- Core
- Remove deprecated call to formatargspec in Python 3.x (#1174)
- Remove old, unreachable code in PyomoModel.py (#1189)
- Clean up default argument for variable fix method (#1221)
- Solver Interfaces
- Fix incorrect precision warnings in the GAMS and BARON writers (#1166)
- Fix typo in MOSEK problem status handling (#1170)
- Fix bug in NEOS interface for Python 3.x (#1206)
- DAE updates
- Fix bug in get_index_information (#1195)
- Remove use of _implicit_subsets (#1197)
- PySP updates
- Expose options for CC and CVaR in the rapper interface (#1211)
- Testing
- Disable extras on Appveyor Python 3.7 build (#1180)
- Add Python 3.8 to Travis test suite (#1182)
- Updates to Jenkins build infrastructure (#1216)
- Documentation
- Minor updates for PySP, GDP, stream-based walkers, and installation
(#1168, #1191, #1204, #1208)
- Contributed Packages
- Add MC++ compiled library version checking (#1172)
- Fix minor type mismatch in PyNumero (#1214)
- Fix deprecation warning in Mindtpy (#1188)
- Add test skipping to trust region tests requiring IPOPT (#1220)
-------------------------------------------------------------------------------
Pyomo 5.6.7 7 Nov 2019
-------------------------------------------------------------------------------
- General
- Update links to tutorials and examples in the README (#1082)
- Verify Python 3.8 support (#1162)
- Core
- Add a guard in getname for ComponentData with no parent (#1075)
- Add support for sqrt in Python-based AD implementation (#1086)
- Add methods to IndexedVar to set bounds for all indices (#1087)
- Replace ReciprocalExpression with DivisionExpression (#989)
- Fix bug where Set multiplication changed the original Sets (#1103)
- Improve ease of use of LinearExpression constructor (#1097)
- Tech preview of the Set component hierarchy rewrite (#1111)
- Add a get_interval method for Sets (#1128)
- Update pprint method for derived classes and add support for printing
ComponentData (#1043)
- Create a common interface for differentiation (#1059)
- Add function to calculate the Taylor series approximation of an
expression (#1059)
- Fix in Sympy interface to avoid complex numbers (#1140)
- Add support for log10 in differentiation (#1145)
- Solver Interfaces
- Fix bug in BARON and GAMS writers for handling exponential expressions (#1114)
- Improve Gurobi persistent interface, enable callbacks, lazy constraints,
and more (#1137)
- MPEC updates
- Update transformations to descend into disjuncts (#1085)
- PySP updates
- Replace Graph.node with Graph.nodes to support networkx 2.4 (#1141)
- GDP updates
- Use a name buffer when generating component names (#1149)
- Testing
- Add pathos library to the Appveyor build (#1135)
- Contributed Packages
- Model viewer improvements and bug fixes (#1071, #1092)
- MindtPy outer approximation improvements (#983)
- GDPOpt improvements, support for Ports (#1098, #1133)
- FBBT improvements and bug fixes, updates to interval arithmetic, support
for log10, replace math.inf with float('inf') (#1131, #1134, #1102, #1078,
#1076, #1146)
- Documentation
- Fix typo in working_models.rst (#1094)
- Add documentation for user interface to LinearExpression (#1120)
-------------------------------------------------------------------------------
Pyomo 5.6.6 21 Jun 2019
-------------------------------------------------------------------------------
- Core
- Remove a line in standard_repn that was unreachable (#1063)
- Solver Interfaces
- Fix symbolic labels for BARON and GAMS (#1057)
- Fix in cplex_direct to check for solution before extracting bounds (#1060)
- Fix in NL writer where a single-term sum output a n-ary operator (#1067)
- Contributed Packages
- FBBT improvements (#1002)
- Benders improvements (#1061)
- GDPopt updates (#922, #1065)
- Model viewer improvements, add residual table, improved install/testing,
support for AbstractModels (#955, #1054, #1066)
-------------------------------------------------------------------------------
Pyomo 5.6.5 10 Jun 2019
-------------------------------------------------------------------------------
- General
- Remove non-ascii character from README.md (#1045)
- PySP
- Fix docstring formatting (#1042)
- Testing
- Resolve book test failures (#1038)
- Contributed Packages
- Benders cut generator component (#1028)
-------------------------------------------------------------------------------
Pyomo 5.6.4 24 May 2019
-------------------------------------------------------------------------------
- General
- Resolve project description rendering on PyPI
-------------------------------------------------------------------------------
Pyomo 5.6.3 24 May 2019
-------------------------------------------------------------------------------
- General
- Update the README (#990, #991, #992)
- Fix compilation with Cython
- Change the default use_signal_handling from True to None (#1014)
- Testing
- Add a license check for Mosek (#1007)
- Add a Cythonization test to Travis (#1012)
- Core
- Bug fix in IndexedComponent using a nonhashable object as an index (#1006)
- Bug fix in fix_discrete transformation for domain comparison (#996)
- Add read-only view of kernel matrix_constraint (#1011, #1013)
- Add specialized conic constraints to kernel (#980, #1018)
- Bug fix in standard repn when using a fixed variable as an exponent (#978)
- Add _associativity to _ExpressionData (#1031)
- Solver Interfaces
- Bug fix in CBC plugin related to certain objective values (#1004)
- Contributed Packages
- FBBT improvements (#994)
- MC++ variable bound guards (#1015)
- Improvements to bounds_to_vars preprocessing transformation (#1016)
- GDPbb improvements and cleanup (#982)
-------------------------------------------------------------------------------
Pyomo 5.6.2 1 May 2019
-------------------------------------------------------------------------------
- General
- Fix setup.py for Windows installation with Python3 and Cython (#823)
- Reorganize how Pyomo manages the version number (#854)
- Updated build badges on main Github page (#867)
- Fix bug in model size report utility (#904)
- Catch eval errors in calculate_variable_from_constraint utility (#872)
- Add project description file used by COIN-OR server (#891)
- Add common utility for downloading files (#819, #927)
- Add infrastructure for building compiled extensions (#940, #959)
- Return the subcommand error code from the pyomo script (#958)
- Fix the "pyomo install-extras" command (#981, #986)
- Deprecate pyomo.bilevel and pyomo.duality (#943)
- Update deprecation decorator to include version number (#943)
- Testing
- Update Appveyor configuration to use --no-update-deps conda option (#837)
- Enable publication of coverage results from Jenkins (#842, #892)
- Update Travis configuration with new docker image location (#880)
- Activate coverage for Anaconda Travis builds (#887)
- Update DataPortal tests requiring PyYaml to not rely on file diffs (#931)
- Add simplified Jenkins test driver (#949, #952, #960)
- Restrict auto-build of PyomoGallery to master branch builds (#985)
- Core
- Reference improvements to support sparse components (#830)
- Fixed typo on Var docstring (#865)
- Initial support for units handling (#833)
- Make component slice objects picklable/deepcopyable (#914)
- Allow variable identification for LinearExpression (#920)
- Split expr_pyomo5.py into three files (#888)
- Fix ordered sets not iterating in correct order (#936)
- Add SimpleBlock to pyomo.core namespace (#941)
- Kernel updates (#951)
- Fix expression infix representation (#966)
- Solver Interfaces
- Add logic to control signals in shellcmd solvers (#856)
- Narrow the check for a valid Baron license (#857)
- Add missing import to kestrel_plugin.py (#895)
- Allow '~' in CPLEX file names (#925)
- Updates to CBC plugin to handle all return statuses and support warm starts
(#874, #946)
- Add Mosek solver plugin (#971)
- GDP updates
- Add nonconvex heat exchanger network example (#824)
- Bugfix for GDP Var mover (#667)
- Add basic step example (#848)
- Add GDP logo (#873, #876)
- Improve error message in GDP reclassification (#884)
- Updates to Stickies example (#937, #948)
- Simplify the fix_disjuncts transformation (#921)
- DAE updates
- Use ConfigBlocks for discretization options handling and several bug fixes
(#967, #973)
- Network updates
- Fix sequential decomposition when ports contain References (#975)
- Contributed Packages
- ParmEst updates to make API more flexible, updated examples, documentation
and tests (#814)
- GDPopt algorithm enhancements, cut generation bug fix, add example
to tests, time limit option support (#805, #826, #852, #970)
- Multistart solver wrapper bug fix for identifying the Objective (#807)
- Updates to MC++ interface and documentation (#827, #929, #939, #964, #968)
- Add import guards for optional packages like Scipy and Pandas (#853, #889)
- PETSc wrapper fixes and enhancements (#806)
- Disjunctive bound tightening with GLOA (#877)
- Use CBC for GDP_bounds OBBT computation (#933)
- Set minimum Numpy version for Pynumero (#962)
- New packages:
- Mixed-Integer Decomposition Toolbox in Pyomo (MindtPy) (#386, #970)
- Feasibility based bounds tightening (#825, #863, #883, #954)
- GDP branch and bound solver (#847, #870, #886)
- Satisfiability solver interface to z3 (#862, #885)
- Automatic/symbolic differentiation of Pyomo expressions in Python
(#818, #926)
- Graphical model viewer/editor (#834, #878, #897, #911, #945)
- Documentation
- Show how to extend an objective function (#820)
- Show how to use PySP with a ConcreteModel (#831)
- Update documentation on assigning values to a Param (#841)
- Update Set documentation (#850)
- Fixed typo in overview documentation (#864)
- Show how to activate/deactivate constraints (#932)
-------------------------------------------------------------------------------
Pyomo 5.6.1 18 Jan 2019
-------------------------------------------------------------------------------
- General
- Fix setup.py installation failure on Windows (#813)
- Testing
- Add assertion method for comparing lists of floats (#800)
- Solver interfaces
- Bugfix in GAMS writer related to splitting long lines (#797)
- Allow ":" in cplex file names (#810)
- Fixes to NEOS interface (#793)
- GDP updates
- Fixed typo in GDP example (#801)
- Add support for RangeSet in GDP transformations (#803)
-------------------------------------------------------------------------------
Pyomo 5.6 19 Dec 2018
-------------------------------------------------------------------------------
- General
- Removing testing and support for Python 2.6 (#322)
- Adding TerminationCondition and SolverStatus to pyomo.environ (#429)
- Refactoring pyomo.util into pyomo.common for the general utilities that do
not depend on the rest of Pyomo, and the user-focused modeling utilities in
pyomo.util. (#502)
- New utilities: Model size report (#579), calculating variable
values (#763)
- Fix pyomo help -s command (#551)
- Fixes to avoid deprecation warnings (#760, #765)
- Core
- Adding the Pyomo5 expression system, which supports PyPy (#272,
#471, #475, #514, #520, #524, #536, #615)
- Optimizations to minimize use of NumericConstant objects (#469)
- Implemented a general-purpose expression visitor (#671)
- Implicitly order Pyomo sets based on insertion order (#568)
- Fix for overriding values in IndexedSets (#710)
- Efficiency improvements when processing unhashable indexes (#467)
- Replace PyUtilib factories with native Pyomo factories (#661)
- unique_component_name now checks all attributes (not just components) (#497)
- Adding relative_to argument for getname() (#495)
- Add 'SubclassOf' to support finding components based on sub class (#723)
- Move PseudoMap out of _BlockData class (#778)
- Add Reference "component" (#655, #742)
- Transformations map create_using arguments through the model clone (#497)
- Implemented a scaling transformation (#694)
- Improvements for External Functions
- Resolved problems with ExternalFunctions with fixed arguments (#442)
- Add method to return F,G,H from AMPL external functions (#666, #668)
- Improvements to symbolic expressions
- Add support for sqrt function in differentiate() (#642)
- Update symbolic differentiation to be compatible with sympy 1.3
and performance improvements (#715, #719)
- Silence invalid error messages logged with Template Expressions (#634)
- Kernel improvements
- Move kernel util (#522)
- Kernel updates (#761)
- Kernel updates simplifying handling of active status on containers,
save storage key on child, warn overwriting container index, fix
linear_canonical_form flag on linear_constraint (#569, #570, #571,
#589, #598)
- Solver interfaces
- Fix to solver tempfiles (#590)
- Prevent crash when solver returns suffixes but not values for
variables (#596)
- Resolving issue when path names with spaces appear in CPLEX run file (#485)
- Fix for spaces in cplex file names (#586)
- Bugfix in Gurobi direct interface (#635)
- Fix NEOS interface when behind a proxy in Python 3.x (#644)
- Fixed Baron writer sqrt error (#751)
- Corrected Ipopt capabilities (#573)
- GAMS writer
- fix for power() expressions (#454)
- fix for fixed variables (#510)
- ShortNameLabeler to limit symbol names (#512)
- Add warning about zero division in variable evaluation (#529)
- Use tmpdir for subprocess files (#530)
- Integrate options attribute (#558)
- Change writer ctype checking (#593, #641)
- Fix double-operator due to negative constant (#698)
- Fix Windows stdout compatibility issue (#779)
- LP writer
- More efficient string manipulation in LP writer (#610)
- Fix generation of bounds for fixed variables in LP writer (#623)
- Cythonized writers in pyomo.repn (#675)
- Bilevel:
- Create pyomo.dualize (#606)
- Updates to dualization and bilevel solvers (#535)
- DAE updates
- Added support for external functions (#526)
- Bugfix in Casadi interface (#544)
- Code overhaul and improved test coverage (#660)
- GDP updates
- Implemented improper basic steps (#582)
- Add examples from literature (#581, #702)
- Improve BigM test robustness (#659)
- Bug fixes (#490, #498)
- PySP updates
- Python 3.7 support (#463)
- Fix bugs in finance example (#564, #578)
- Added a wrapper for PySP to create a scripting interace (#689, #727, #737)
- Bug fixes (#736, #788)
- New packages:
- DataPortal:
- Move DataPortal up to a top-level pyomo.dataportal subpackage (#607)
- Update options for pymysql (#678)
- Network
- Replaced Pyomo connector infrastructure with Pyomo.Network and
added sequential modular simulation capability (#583, #648)
- Contributed packages:
- GDPopt updates to use config blocks, support integer variables,
documentation, callback renaming, new initialization strategy
(#513, #541, #595, #599, #633, #650, #717)
- Update trust region to use ConfigBlocks (#738, #785)
- New packages:
- Preprocessing transformation for variable aggregation (#533, #617)
- Compute disjunctive variable bounds (#481)
- ParmEst package for parameter estimation (#706, #733, #769, #781)
- PyNumero package for numerical optimization (#725, #775)
- sensitivity_toolbox for interfacing with sIPOPT (#766)
- PETSc AMPL wrapper (#774)
- Testing
- Resolved several build errors on Appveyor (#438, #539, #552, #577, #705)
- Reconfigured Travis CI to run tests using DockerHub images, work on PRs
from forks, run Python 3.7 (#479, #517, #600)
- Jenkins driver updates to fix errors when files are moved/renamed,
delete coverage info from previous builds, decode unicode in
booktests driver, test fixes, new drivers (#627, #629, #630, #631,
#704, #735, #772, #771, #786)
- Documentation and Examples
- Converted old asciidoc documentation to Sphinx (#486, #574)
- Reorganized the Sphinx documentation to make it easier to navigate
and merge old and new documentation sections (#699)
- Create more prominent section for documentation on contrib packages (#729)
- Documentation updates: scripting (#543, #748, #756), pyomo.network
(#651, #745, #780), preprocessing transformations (#653), GAMS writer
(#518), pyomo.kernel (#767), abstract models (#777), general (#782)
- Document PR process (#628)
- Updated README.md to include link for performance plots (#534)
- Update examples (#436)
-------------------------------------------------------------------------------
Pyomo 5.5.1 26 Oct 2018
-------------------------------------------------------------------------------
- General
- Adding support for Python 3.7
-------------------------------------------------------------------------------
Pyomo 5.5 14 Apr 2018
-------------------------------------------------------------------------------
- Move preprocessing transformations to contrib (#426)
- Moves bounds_to_vars and propagate_zero_sum into contrib.preprocessing and
changes aliases to contrib.bounds_to_vars and contrib.propagate_zero_sum.
- Improved external function support
- Fixing AMPLFUNC environment variable management for "derived ASL
solvers (ipopt, conopt, scipampl) (#423)
- Adding support for using the AMPL GSL library (#427)
- PySP updates
- Fixing atypical methods in PySP for generating a scenario tree and
associated instances (#422, #424)
- Adding support in PySP for new persistent solver API (#397)
- Fixing bug in Eckstein-Combettes PySP-PH extension for
handling unused model variables (#396)
- GDP updates
- add support for implicit declaration of multi-constraint Disjuncts (#410)
- switch to using ConfigBlocks for chull, bigm relaxations (#410)
- fix for Big-M with disjuncts containing indexed blocks (#421)
- Fix for discretizing block hierarchical models with
circular references (#406, #353)
- Fix formatting for small numbers in Baron file writer (#405)
- Allow retrieving a mutable Param even when no initial or
default value is specified (#393)
- Python3 fix for Set.pprint
- Make handling of trivially non-binding constraints consistent across
the various solver interfaces (#392)
- Fix to pprint for Params that store non-numeric values
- Removing use of namespace_packages in setup.py
- Modifying transformation that detects trivial constraints to maintain
a list of the constraints that were deactivated (#385)
- Documentation updates (#425)
-------------------------------------------------------------------------------
Pyomo 5.4.3 2 Mar 2018
-------------------------------------------------------------------------------
- Another fix in the release process.
-------------------------------------------------------------------------------
Pyomo 5.4.2 2 Mar 2018
-------------------------------------------------------------------------------
- Misc fix in the release process.
-------------------------------------------------------------------------------
Pyomo 5.4.1 28 Feb 2018
-------------------------------------------------------------------------------
- Misc version increment to support pypi idiosyncrasies.
-------------------------------------------------------------------------------
Pyomo 5.4 28 Feb 2018
-------------------------------------------------------------------------------
=======
- Remove checks for is_indexed from PersistentSolver methods (#366)
- GDP rewrite (#354)
- Updated gdp.chull to handle named expressions (#318)
- Fixed Disjunction to support declaration without expr or rule (#241)
- Misc Gurobi and Cplex fixes (#368)
- Fix to gurobi_direct initialization when gurobipy is not available. (#363)
- Fixes to persistent solvers (#361)
- Fix to cplex 12.6 error management. (#357)
- Fix intermittent "unclonable" component error (#356)
- Fix GAMS interface ignoring `tee` (#351)
- Remove duplicated 'Key' for Expression.display() (#349)
- removing import from GUROBI_RUN.py (#344)
- Add logfile option to GAMS solver (#302)
- Improvements for Gurobi/Cplex Interfaces (#331)
- GDPopt solver initial implementation (#337)
- Fixed to update IndexedVar domain display (#5)
- Reorganize the API documentation (#333)
- Transformation to strip bounds from model (#220)
- Adding transformation to propagate equality-linked fixed variables (#192)
- Fixing Python 3.x compatibility for Sets (#305)
- Fix so that GAMS writer can safely ignore Connector objects (#310)
- Faster solution parsing for CBC (#311)
- Reworked pyomo.contrib and added the pyomo.contrib.example package (#299)
- Fixes for Python 2.6 compatibility in third-party packages
- Adding diagnostic functions for Pyomo models (#217)
- Allow None to be a valid value for Params (#301)
- Improved testing with Travis and Appveyor
- Fixes to Pyro management with PySP solvers
- Transformation of explicit constraints to variable bounds (#190)
- Corrected the settimelimit option with CBC (#265)
- Bug fixes in direct/persistent solver interfaces (#282)
- A major rework of the PySP solver interface
- Added testing for Sphinx code fragments
- Various updates to online documentation generated by Sphinx
- Add error message to model.write if guess_format returns None (#260)
- Ensure that generate_cuid_names descends into Disjunct objects (#176)
- Fix GAMS writer to better support the power function (#263)
- Added persistent interfaces for CPLEX and Gurobi (#262)
- Added additional timing information for model construction and solvers
- Logging overhaul and support for timing concrete models (#245)
-------------------------------------------------------------------------------
Pyomo 5.3 21 Oct 2017
-------------------------------------------------------------------------------
- Removed testing for Python 3.4
- Added exp() to symbolic module (#151)
- Resolved representation error with 1/var (#153)
- Added pyomo.core.kernel (#130)
- Various solver interface fixes: CBC, SCIP, IPOPT, GLPK
- Add docstring to apply function in Transformation (#174)
- Adding a TerminationCondition enum value for "Infeasible or Unbounded" (#171)
- New scripts for performance testing
- Use the has_lb() and has_ub() helper methods for vars and constraints.
- Added documentation tests.
- Updates to DAPS (#200)
- Fix KeyError message in NL writer (#189)
- New ODE/DAE simulator interface for pyomo.DAE (#180)
- Added deprecation decorator (#203)
- New transformation to fix nonnegative variables in equality constraints (#198)
- Deprecated BigM piecewise representations (#216)
- Added GAMS solver interface (#164, #215, #221, #240)
- Updates to testing configuration on Travis and Appveyor
- Tracking changes in pyutilib.th
-------------------------------------------------------------------------------
Pyomo 5.2 14 May 2017
-------------------------------------------------------------------------------
- Resolved timeout issues running NEOS solvers
- Changing the generic ASL solver plugin to use '-AMPL' rather than '-s'
- Fixed loading solutions into sub-blocks (#127)
- Cloning a model now preserves any previous solution(s).
- Fixing pickling of ModelSolutions objects. (#65)
- Allow cloning of blocks even when attributes cannot be deep copied
- Fixed how GUROBI_RUN reports the solve time.
- Added DAPS solver (#139)
- Adding support for Python 3.6. (#103)
- Restricting user defined component names on Blocks to avoid overwriting
important Block methods. (#126)
- Updating pyomo.dae transformations to support Block-derived components.
(#132, #129, #89)
- Fix rare issue where numeric constants in the left- and right-hand sides of a
double inequality expression were incorrectly mapped to an equality
expression even when the values were different.
- Creating an Ipopt solver plugin with additional functionality for sending
options to Ipopt using an options file. Options beginning with 'OF_' will be
interpreted as options that should appear in an options file. A warning is
printed when this will cause an existing 'ipopt.opt' file in the current
working directory to be ignored.
- Make the Ipopt solver plugin more gracefully handle the case when a solution
file is not created by the solver (e.g., when the solver exits because there
are too few degrees of freedom). (#135)
- Reduce time required to import pyomo.environ by delaying checks for
availability of solver interfaces until they are used. (#109)
- Adding support for solving Blocks as if they were Models. (#110, #94)
- Adding support for declaring components on a model by decorating the rule
instead of explicitly invoking the setattr method on the block. This
eliminates the normal pattern of the component name appearing in three
places. (#99)
- Fixes to pyomo.gdp transformations for nested blocks.
- Fixing case in block recursion where descend_into was not being honored.
- Bug fix that impacted non-serial solver managers.
- Make checks for is_indexed() more efficient. (#105)
- Fixes to files for PEP8 compliance.
- Fix to statues set by CPLEX plugin when problem is unbounded.
- Improving Param exception messages.
- Putting a daps release in PySP (#124)
- Updating the bilinear transform to avoid creating a Set `index`.
-------------------------------------------------------------------------------
Pyomo 5.1.1 8 Jan 2017
-------------------------------------------------------------------------------
- Monkeypatch to resolve (#95)
-------------------------------------------------------------------------------
Pyomo 5.1 4 Jan 2017
-------------------------------------------------------------------------------
- Added a CONOPT plugin to handle a custom SOL file output (#88)
- Changed 'pyomo solve' to use any Model object that is found, rather than
requiring the default object to be named 'model' (#80)
- Reworked the solver testing infrastructure to enable enumeration of all
test scenarios, which is used by 'pyomo test-solvers' (#78)
- Fixes for xpress solver options writer (#79)
- Resolved an issue where Pyomo was unnecessarily cloning most inequality
expressions (#80)
- Reworked the Pyomo *.DAT file parser and post-parse processing logic. This
eliminates parse ambiguities that were causing test failures.
- Finalized book test examples for the new edition of the Pyomo book
- Added pyomo.contrib to support integration of third-party Pyomo libraries
in a standard manner
- Fixed TravisCI testing issues where the incorrect version of Python was being
tested
- Fixed error messages in pyomo.dae (#81)
- Revised CBC interface to recognize intermediate non-integer solutions (#77)
- Added checks for IPOPT test failures based on version info (#72)
- Removed support for OpenOpt
-------------------------------------------------------------------------------
Pyomo 5.0.1 16 Nov 2016
-------------------------------------------------------------------------------
- Updating PyUtilib dependency
-------------------------------------------------------------------------------
Pyomo 5.0 15 Nov 2016
-------------------------------------------------------------------------------
- Added examples used in the Pyomo book to the Pyomo software repos
- Added support for automatically generating "template expressions"
- Fix tuple flattening in the case of unhashable SimpleParam in indexes
- Deactivated solver plugins before the are returned from the SolverFactory
- Significantly simplified the polynomial_degree() logic for Pyomo4 expressions
- Updates to expression logic
- Adding a 'feasible' attribute to the TerminationCondition Enum
- Updates to ExternalFunction logic
- Renamed the component name() method to getname() and added a 'name' property
- Fix to allow creating undefined (and uninitialized) mutable params
- Added more careful checks in Set() and Param() to ensure that an abstract set
expression is not evaluated
- Added DAE examples to Pyomo
-------------------------------------------------------------------------------
Pyomo 4.4.1
-------------------------------------------------------------------------------
- Fixing PyUtilib dependency version.
-------------------------------------------------------------------------------
Pyomo 4.4
-------------------------------------------------------------------------------
- Output a warning in benders when the solver interface used to solve the
master problem does not report a solution gap
- Document DAE transformations (#28)
- Allow use of ellipsis in the middle of the indices when slicing
- The Component slicing logic now uses simple slices (`:`) for matching a
single index and the Ellipsis (`...`) for matching zero or more indices.
- Fixing Python 3 compatibility problems in pyomo.dae & dae examples.
- Support evaluating external functions in AMPL-stype shared libraries.
- Renaming "BasicExternalFunction" to "AMPLExternalFunction"
- Allowing Params to be used in setting bounds on a ContinuousSet.
- Use HTTPS with NEOS
- Allow a mutable Parameter that has not been initialized with a value to
be used in the rhs of an equality constraint. (#13)
- Updates to SolverFactor to better support functionality offered by the
'executable' keyword for SystemCallSolver.
- Updates to writers to enforce consistent output ordering in quadratic
expressions.
- Improving the error message for Constraint rules that return None
- Adding PySP solver interface to the SD solver
- Adding an implicit SP representation to PySP that uses annotations
for declaring mutable parameters as stochastic data and providing
a distribution (only tables supported for now).
- Partial fix for infinite recursion reported (#6). This will support
creating scalar (simple) components by passing a set([None]) in
as the index.
- Extending component slicing ability to nested (hierarchical) slices.
-------------------------------------------------------------------------------
Pyomo 4.3 (4.3.11381)
-------------------------------------------------------------------------------
- Removed 'nose' from required packages during installation.
- Fix to be compatible with older versions of 'six'.
-------------------------------------------------------------------------------
Pyomo 4.3 (4.3.11377)
-------------------------------------------------------------------------------
- Restructured PySP tests to hide expected exception output
- Updated pyomo_install to support jython (experimental)
- Fixed a missing reference to 'six'
- More robust management of file I/O in GLPK interface
-------------------------------------------------------------------------------
Pyomo 4.3 (4.3.11345)
-------------------------------------------------------------------------------
- Various fixes to the NEOS solver plugin and to the SOL parser for
certain NEOS solvers.
- Fixed a bug that caused an exception to occur when dynamically adding blocks
to a ConcreteModel.
- Miscellaneous fixes to PySP scripting examples.
-------------------------------------------------------------------------------
Pyomo 4.3 (4.3.11328)
-------------------------------------------------------------------------------
- Misc bug fix
-------------------------------------------------------------------------------
Pyomo 4.3 (4.3.11327)
-------------------------------------------------------------------------------
- Resolved bug in pyomo_install when pyvenv cannot be found.
- Gracefully trap BARON terminations
-------------------------------------------------------------------------------
Pyomo 4.3 (4.3.11323)
-------------------------------------------------------------------------------
- Scripts
- pyomo_install
- Added --pip-options to specify options for PIP option
- Added --index-url to specify the PyPI mirror
- Restructured this script to make it more modular
- Deprecated the --with-extras option
- Added "--venv-only" option for setting up a local python virtual
environment with no additional packages (apart from pip, setuptools, and
potentially wheel).
- Fixes when installing from zip files offline.
- get-pyomo-extras.py
- Misc fixes and updates
- pyomo
- Consolidated help information within the 'pyomo help' subcommand
- Added 'pyomo install-extras' to install third-party dependencies
- pyomo.bilevel
- Major changes to get the bilevel_ld solver working
- Extended the logic in SubModel to allow for implicit declarations of
upper-level variables.
- pyomo.check
- More complete scoping checks
- pyomo.core
- Changes to allow sorted output using DataPortal objects
- Bug fix in linear dualization transformation
- Adding a mechanism to load default configuration information from a
standard location.
- Changes to allow objectives to be used inside expressions, and to
allow objectives to be sent through the solver plugins
- Updating blocks so that models can be created and populated using rule options
- Added a domain property method to IndexedVar so it cannot be treated as having
a single domain
- Added the Var() 'dense' option. This defaults to True, which defines variables
densely. But sparse variables are defined when dense==False.
- Change to define a SOS constraint over the declared index set for a variable
unless an explicit index set is provided.
- Changes to ensure that most components do not define their data densely.
- pyomo.dae
- Updates to support Python3 and current Pyomo Transformation API
- Fixed the collocation extension to reduce the degrees of freedom for certain variables
- pyomo.gdp
- Many fixes to bilinear transformation
- Fixed the Big-M estimation routine to work with constant expressions
- pyomo.neos
- Added support for ephemeral solver options, which over-ride the
options dictionary
- Fixes to enable loading of solutions from NEOS solvers
- pyomo.opt
- Sort variable names when printing results
- Many fixes to sol reader.
- pyomo.pysp
- Updates to ScenarioStructure.dat to handle a larger
class of models that can have non-uniform variable sets
in later time stages. Also updating parsing rules to
allow for more convenient variable declarations
- NodeVariables / NodeDerivedVariables can be used in
place of StageVariables / StageDerivedVariables to
declare variables on a per-node basis
- Indexed variables can be declared without bracket
notation (e.g., x[*,*] -> x)
- Single or indexed block names can be used to
conveniently declare all variables found on that
block within a node or stage
- Re-write of runef and runbenders based off of new PySP
scripting tools
- Adding option to runbenders for including one or more
scenarios in the master benders problem
- Fixes to csvsolutionwriter so that it works with
distributed PH
- Added new script (evaluate_xhat) that allows users to
evaluate SP solutions on alternate scenario trees.
- Added more extensive checking to PySP->SMPS conversion
utility (pysp2smps) to alert users when conversion fails
due to non-uniform problem structure or missing
stochastic annotations
- Added helper routine to convert a networkx directed
graph into a PySP scenario tree model
- Fixes to PH for better handling of user warmstarts
- pyomo.repn
- Updates to the NL writer to handle new expression types.
- Added an MPS writer
- pyomo.scripting
- Updated the Pyro mip server to improve its efficiency
- pyomo.solvers
- Updates to xpress plugin to use the ASL interface to xpress.
- Fixed a major issue with the gap computation in the CPLEX direct/persistent
solver plugins
- Significant speed-up of the the CPLEX persistent plugin.
- Added the 'mps' mode for various solvers.
- Changes to the Pyro solver manager to allow out-of-order results collection
-------------------------------------------------------------------------------
Pyomo 4.2 (4.2.10784)
-------------------------------------------------------------------------------
- Changes to make the --json command-line option backwards compatible.
-------------------------------------------------------------------------------
Pyomo 4.2 (4.2.10782)
-------------------------------------------------------------------------------
- pyomo.core
- Removed the 'initial' attribute from Var components.
- Removed the 'reset()' method from core components.
- Objective components now store sense for each objective.
- Added support for slicing when indexing a component.
- pyomo.dae
- Added methods to set and test the value of integral expressions
- pyomo.gdp
- Added property methods to access disjunction expressions (e.g. lower, upper)
- pyomo.opt
- Added support for ephemeral solver options that override the default
values set in the solver object.
- pyomo.neos
- Bug fixes to get data after calling NEOS
- Resolving issues with python 3
- pyomo.scripting
- Added --pyro-host and --pyro-port options
- Added shutdown capabilities to pyro solver manager
- Collect solve time for pyro solvers
- pyomo.pysp
- Added --pyro-host and --pyro-port options to manage pyro-based execution
in a more robust manner.
- Adding utility for converting PySP models into SMPS input files (pysp2smps).
- pyomo.solver
- Resolved serious issues with python direct interfaces:
- CPLEX: constants in linear range constraints and all quadratic
constraints were being excluded from the expression.
- CPLEX and GUROBI: actually raise an exception when a nonlinear
(non-quadratic) objective or constraint expression is encountered
rather than just emitting the linear and quadratic part of the
expression to the solver. This could lead to a naive user
thinking they have solved a general nonlinear model with these
solvers.
- CPLEX and GUROBI: do not skip trivial constraints by default.
Adding I/O option 'skip_trivial_constraints' to recover this
behavior.
- CPLEX: Merging as much of CPLEXPersistent with CPLEXDirect
as possible to avoid repeating bug fixes. More should be done,
but for now CPLEXDirect is a base class for CPLEXPersistent.
- Fix to various solver plugins so that variable bounds set to
float('inf') and float('-inf') are treated the same as variable
bounds set to None.
- Updates to Pyro solver managers
- Major performance enhancements for Pyro-based solver managers.
- Tasks can be uploaded to the dispatcher in bulk.
- Workers no longer use a timeout when requesting tasks from the queue, which
was wasting CPU cycles.
- Compatibility fixes when Pyro4 is used.
- other
- Updated the get-pyomo-extras.py script to install conditional dependencies
for Pyomo (e.g. xlrd and ipython)
- Adding logic to explicitly identify metasolvers. This information is
reflected in the 'pyomo help -s' command.
- Deprecated 'pyomo.os', which was not being actively supported.
- Added the 'pyomo info' subcommand to provide information about the Python
installation.
-------------------------------------------------------------------------------
Pyomo 4.1 (4.1.10519)
-------------------------------------------------------------------------------
- Resolving bugs in NEOS solver interface due to change in solver options
management.
-------------------------------------------------------------------------------
Pyomo 4.1 (4.1.10509)
-------------------------------------------------------------------------------
- Cleanup runbenders script to make it easier to test
- Cleanup temporary files during testing.
- Fixing PyUtilib version
-------------------------------------------------------------------------------
Pyomo 4.1 (4.1.10505)
-------------------------------------------------------------------------------
- Allow the dim() method to be called without the equality operator, which
enables its use on unconstructed components
- RangeSet inherits from OrderedSimpleSet
- Added missing __slots__ declarations in set classes
-------------------------------------------------------------------------------
Pyomo 4.1 (4.1.10486)
-------------------------------------------------------------------------------
- API changes for model transformations
- Revised API for SOSConstraint, Suffix and Block components
- Optimization results are now loaded into models
- Removed explicit specification of model preprocessing
- Resolved many issues with writing and solving MPECs
- Changes to MPEC meta-solver names
- The solution output for runph has been changed to
- Pyomo subcommands can now use configuration files (e.g. pyomo solve config.json)
- New JSON/YAML format for parameter data
- Added a script to install pyomo.extras
-------------------------------------------------------------------------------
Pyomo 4.0 (4.0.9682)
-------------------------------------------------------------------------------
- Adding a more useful error message when a named objective is not
present when load-solution is invoked on a model.
- Bug fix for pickling results objects.
- Performance fix for ordered sets
- Removed StateVar from DAE examples.
- Resolving a bug that disabled pyodbc support.
- Added preliminary support for pypyodbc.
- Fix to enable sets to be initialized with a tuple
- PySP test baseline updates
- Added PySP ddsip extension.
- Removed the 'pyomo bilevel' and 'pyomo mpec' subcommands
- Re-enabled the 'import' and 'export' Pyomo data commands, which
are still deprecated.
- Various performance enhancements to avoid iterating over list of
dictionary keys.
- Added a ComplementarityList component.
-------------------------------------------------------------------------------
Pyomo 4.0 (4.0.9629)
-------------------------------------------------------------------------------
This release rebrands Coopr as Pyomo, which reflects the fact that
users have consistently confused the Coopr software and the Pyomo
modeling language. Pyomo 4.0 includes the following significant
changes:
- Pyomo provides a single source tree replacing all Coopr packages
- The 'pyomo' command replaces the 'coopr' command
- The 'pyomo solve' subcommand replaces the former 'pyomo' command
- The 'pyomo.environ' package is now used to import core Pyomo capabilities
- Robust support for Python 3.x
The following are highlights of this release:
- Modeling
* Added a RealInterval domain
* Major rework of coopr.dae. Can now represent higher order and partial
differential equations. Also added more discretization schemes.
- Solvers
* Added preliminary support for a Benders solver
* Added support for the BARON solver
* Preliminary support for MPEC solvers, including the PATH solver
- Transformations
* Added explicit support for model transformations
* The 'pyomo solve --transform' option specified model transformations
* Created a streamline linear dual transformation
- Other
* The 'pyomo help' command documents installed capabilities
* Major rework and simplification of the 'pyomo_install' script
* Added support for parallelism using Pyro4
-------------------------------------------------------------------------------
Pyomo 3.5.8787
-------------------------------------------------------------------------------
- pyomo.opt 2.12.2
pyomo.core 3.6.4
pyomo.pysp 3.5.5
pyomo.solvers 3.2.1
-------------------------------------------------------------------------------
Pyomo 3.5.8748
-------------------------------------------------------------------------------
- pyomo.pysp 3.5.4
-------------------------------------------------------------------------------
Pyomo 3.5.8734
-------------------------------------------------------------------------------
- PyUtilib 4.7.3336
-------------------------------------------------------------------------------
Pyomo 3.5.8716
-------------------------------------------------------------------------------
- pyomo.core 3.6.3
pyomo.pysp 3.5.3
-------------------------------------------------------------------------------
Pyomo 3.5.8706
-------------------------------------------------------------------------------
- pyomo.util 2.0.4
pyomo.core 3.6.2
-------------------------------------------------------------------------------
Pyomo 3.5.8690
-------------------------------------------------------------------------------
- pyomo.neos 1.1.2
pyomo.opt 2.12.1
pyomo.core 3.6.1
pyomo.pysp 3.5.2
- Added the pyomo_install script
-------------------------------------------------------------------------------
Pyomo 3.5.8669
-------------------------------------------------------------------------------
- PyUtilib 4.7.3311
pyomo.util 2.0.3
-------------------------------------------------------------------------------
Pyomo 3.5.8663
-------------------------------------------------------------------------------
- PyUtilib 4.7.3305
pyomo.util 2.0.2
pyomo.environ 1.0.1