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MathOptInterface (MOI) release notes

v0.8.0 (December 18, 2018)

  • Rename all enum values to follow the JuMP naming guidelines for constants, e.g., Optimal becomes OPTIMAL, and DualInfeasible becomes DUAL_INFEASIBLE.
  • Rename CachingOptimizer methods for style compliance.
  • Add an MOI.TerminationStatusCode called ALMOST_DUAL_INFEASIBLE.

v0.7.0 (December 13, 2018)

  • Test that MOI.TerminationStatus is MOI.OptimizeNotCalled before MOI.optimize! is called.
  • Check supports_default_copy_to in tests (#594).
  • Key pieces of information like optimality, infeasibility, etc., are now reported through TerminationStatusCode. It is typically no longer necessary to check the result statuses in addition to the termination status.
  • Add perspective dimension to log-det cone (#593).

v0.6.4 (November 27, 2018)

  • Add OptimizeNotCalled termination status (#577) and improve documentation of other statuses (#575).
  • Add a solver naming guideline (#578).
  • Make FeasibilitySense the default ObjectiveSense (#579).
  • Fix Utilities.@model and Bridges.@bridge macros for functions and sets defined outside MOI (#582).
  • Document solver-specific attributes (#580) and implement them in Utilities.CachingOptimizer (#565).

v0.6.3 (November 16, 2018)

  • Variables and constraints are now allowed to have duplicate names. An error is thrown only on lookup. This change breaks some existing tests. (#549)
  • Attributes may now be partially set (some values could be nothing). (#563)
  • Performance improvements in Utilities.Model (#549, #567, #568)
  • Fix bug in QuadtoSOC (#558).
  • New supports_default_copy_to method that optimizers should implement to control caching behavior.
  • Documentation improvements.

v0.6.2 (October 26, 2018)

  • Improve hygiene of @model macro (#544).
  • Fix bug in copy tests (#543).
  • Fix bug in UniversalFallback attribute getter (#540).
  • Allow all correct solutions for solve_blank_obj unit test (#537).
  • Add errors for Allocate-Load and bad constraints (#534).
  • [performance] Add specialized implementation of hash for VariableIndex (#533).
  • [performance] Construct the name to object dictionaries lazily in model (#535).
  • Add the QuadtoSOC bridge which transforms ScalarQuadraticFunction constraints into RotatedSecondOrderCone (#483).

v0.6.1 (September 22, 2018)

  • Enable PositiveSemidefiniteConeSquare set and quadratic functions in MOIB.fullbridgeoptimizer (#524).
  • Add warning in the bridge between PositiveSemidefiniteConeSquare and PositiveSemidefiniteConeTriangle when the matrix is almost symmetric (#522).
  • Modify MOIT.copytest to not add multiples constraints on the same variable (#521).
  • Add missing keyword argument in one of MOIU.add_scalar_constraint methods (#520).

v0.6.0 (August 30, 2018)

  • The MOIU.@model and MOIB.@bridge macros now support functions and sets defined in external modules. As a consequence, function and set names in the macro arguments need to be prefixed by module name.
  • Rename functions according to the JuMP style guide:
    • copy! with keyword arguments copynames and warnattributes -> copy_to with keyword arguments copy_names and warn_attributes;
    • set! -> set;
    • addvariable[s]! -> add_variable[s];
    • supportsconstraint -> supports_constraint;
    • addconstraint[s]! -> add_constraint[s];
    • isvalid -> is_valid;
    • isempty -> is_empty;
    • Base.delete! -> delete;
    • modify! -> modify;
    • transform! -> transform;
    • initialize! -> initialize;
    • write -> write_to_file; and
    • read! -> read_from_file.
  • Remove free! (use Base.finalize instead).
  • Add the SquarePSD bridge which transforms PositiveSemidefiniteConeTriangle constraints into PositiveSemidefiniteConeTriangle.
  • Add result fallback for ConstraintDual of variable-wise constraint, ConstraintPrimal and ObjectiveValue.
  • Add tests for ObjectiveBound.
  • Add test for empty rows in vector linear constraint.
  • Rework errors: CannotError has been renamed NotAllowedError and the distinction between UnsupportedError and NotAllowedError is now about whether the element is not supported (i.e. it cannot be copied a model containing this element) or the operation is not allowed (either because it is not implemented, because it cannot be performemd in the current state of the model, because it cannot be performed for a specific index, ...)
  • canget is removed. NoSolution is added as a result status to indicate that the solver does not have either a primal or dual solution available (See #479).

v0.5.0 (August 5, 2018)

  • Fix names with CachingOptimizer.
  • Cleanup thanks to @mohamed82008.
  • Added a universal fallback for constraints.
  • Fast utilities for function canonicalization thanks to @rdeits.
  • Renamed dimension field to side_dimension in the context of matrix-like sets.
  • New and improved tests for cases like duplicate terms and ObjectiveBound.
  • Removed cantransform, canaddconstraint, canaddvariable, canset, canmodify, and candelete functions from the API. They are replaced by a new set of errors that are thrown: Subtypes of UnsupportedError indicate unsupported operations, while subtypes of CannotError indicate operations that cannot be performed in the current state.
  • The API for copy! is updated to remove the CopyResult type.
  • Updates for the new JuMP style guide.

v0.4.1 (June 28, 2018)

  • Fixes vector function modification on 32 bits.
  • Fixes Bellman-Ford algorithm for bridges.
  • Added an NLP test with FeasibilitySense.
  • Update modification documentation.

v0.4.0 (June 23, 2018)

  • Helper constructors for VectorAffineTerm and VectorQuadraticTerm.
  • Added modify_lhs to TestConfig.
  • Additional unit tests for optimizers.
  • Added a type parameter to CachingOptimizer for the optimizer field.
  • New API for problem modification (#388)
  • Tests pass without deprecation warnings on Julia 0.7.
  • Small fixes and documentation updates.

v0.3.0 (May 25, 2018)

  • Functions have been redefined to use arrays-of-structs instead of structs-of-arrays.
  • Improvements to MockOptimizer.
  • Significant changes to Bridges.
  • New and improved unit tests.
  • Fixes for Julia 0.7.

v0.2.0 (April 24, 2018)

  • Improvements to and better coverage of Tests.
  • Documentation fixes.
  • SolverName attribute.
  • Changes to the NLP interface (new definition of variable order and arrays of structs for bound pairs and sparsity patterns).
  • Addition of NLP tests.
  • Introduction of UniversalFallback.
  • copynames keyword argument to MOI.copy!.
  • Add Bridges submodule.

v0.1.0 (February 28, 2018)

  • Initial public release.
  • The framework for MOI was developed at the JuMP-dev workshop at MIT in June 2017 as a sorely needed replacement for MathProgBase.