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Gurobi Optimizer Versions:
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Gurobi Optimizer v6.0.5
Bug Fixes
- Floating licenses now support distributed optimization
- Added support for R 3.2 (and dropped support for R 3.0)
- Added support for MATLAB R2015a
- Dropped support for OS X 10.7
- Fixed an issue in installing the Python interface on Mac OS X El Capitan
- Added QConstr.get() to the object oriented interfaces
- Fixed an issue in the Python interface where tuplelist.pop could lead to an infinite recursion
- Added a few missing parameter/attribute constants to the Python interface
- Fixed an issue in compute server that could lead to a stack overflow with JRockit JVM’s small default stack size
- Fixed an issue in barrier where models with large negative objectives could be incorrectly classified as infeasible
- Fixed an issue where the best bound in the log could be wrong on models with disconnected components
- Fixed an issue creating nodefile directories on models with disconnected components
- Fixed a segfault in primal simplex
- Fixed an issue when translating MIQP maximization models with nonconvex objectives and bounded integer variables
- Fixed a bug in the parallel column presolve reduction that could lead to incorrect results
- Fixed a bug in presolve where unscaled violations were incorrectly used instead of scaled violations
- Fixed an issue with ScaleFlag=2 that could lead to inconsistent results when solving a model multiple times
- Fixed an issue where calling update and reset on models with piecewise-linear objectives could lead to a crash
- Fixed an issue where constants in the objectives were not correctly updated when the model’s sense was changed
- Added support for SI keyword for semi-integer variables in MPS files
- Fixed a bug in quadratic cuts for models with quadratic constraints
- Increased limits on length of command line parameters and lines in license file
Gurobi Optimizer v6.0.4
Bug Fixes
- Fixed a bug in distributed MIP where the cutoff was not respected
- Fixed a memory leak in the Python interface when callbacks are used
- Fixed an issue in the LU factorization
- Fixed a bug in the MIR cut separation routine
- Added –port flag to gurobi_cl for specifying Compute Server port
- Fixed an issue where lazy constraints were ignored in an unusual case
- Improved support for unicode strings in Python 2.7 interface
- Fixed a bug in the symmetry detection code
- Fixed an issue in Compute Server when client had more than 1024 open files
- Fixed a performance issue in GRBaddqconstr
Gurobi Optimizer v6.0.3
Bug Fixes
- Improved the linearization of MIQCP with quadratic matrix that is non-PSD
- Modified the QP syntax for the R interface so that it solves min c’x + 1/2 x’Qx
- Fixed an issue where GRBgetttuneresult modified the TimeLimit parameter
- Python LinExpr() now supports generator expressions
- Fixed an issue when setting the LogFileName for the compute server
- Fixed an issue for models containing both a piecewise linear objective and quadratic constraints
- Fixed the reading of QCMatrix section in MPS files
- Fixed an issue when mixing 32-bit and 64-bit machines in distributed MIP
- MPS reader now passes SOS data to compute server
- Fixed a memory issue when re-optimizing a MIP
- Fixed a license key issue in multi-threaded application
Gurobi Optimizer v6.0.2
Bug Fixes
- Added support for Python 3.4 on Windows and Linux
- Added support for alternative Python distributions on Mac OS X
- Improved robustness when network connections to remote workers are lost
- Improved initialization of WorkerPassword parameter from compute server password
- Fixed a bug in primal simplex when a singular basis is encountered on models with large aspect ratios
- Fixed an issue for models with piecewise-linear objectives and quadratic constraints
- Fixed an issue in presolve for models with quadratic equality constraints
- Fixed an issue where the distributed tuner ignored Ctrl-C
- Improved error checking for invalid constraint senses
- Fixed an issue with the GRBsvec struct in the user-callable advanced simplex routines
- Reject ‘!=’ constraints in Python interface
- Support LinExpr([]) in Python
- Fix an underallocation issue for MIQCP models when using lazy constraints
- Fix a bad CB_RUNTIME return value from the MESSAGE callbac
