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CHANGELOG.md

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CHANGELOG

Unreleased

3.1.0 - 2020-12-17

Added

  • add more SCIP functions: getNSols, createPartialSol

Fixed

  • consistent handling of filenames for reading/writing
  • fix error when no SCIPOPTDIR env var is set on Windows

3.0.4 - 2020-10-30

Added

  • add more SCIP functions: getNTotalNodes, getNIntVars, getNBinVars

Fixed

  • getTransformedVar now uses SCIPgetTransformedVar instead of SCIPtransformVar which captures the variable

3.0.3 - 2020-09-05

Added

  • add parameter genericnames to Model.writeProblem() to allow for generic variable and constraint names

Fixed

  • strip quotes from SCIPOPTDIR path variable that might confuse Windows systems

3.0.2 - 2020-08-09

Added

  • allow creation of implicit integer variables
  • make some more SCIP functionality available

Fixed

  • fix reference counters for Python constraints

3.0.1 - 2020-07-05

Added

  • expose even more SCIP functionality in scip.pxd

Changed

  • Model.from_ptr and Model.to_ptr use a PyCapsule to exchange the SCIP pointer rather than an integer.
  • mark getDualMultiplier() as deprecated, only getDualSolLinear() is supposed to be used to get duals of constraints

Removed

  • removed __div__ from Expr and GenExpr to make it compatible with cython 0.29.20

3.0.0 - 2020-04-11

Added

  • add Model.getParams that returns a dict mapping all parameter names to their values
  • add Model.setParams to set multiple parameters at once using a dict
  • Add Model.from_ptr and Model.to_ptr to interface with SCIP* managed outside of PySCIPOpt
  • add NULL pointer checks to all Python wrapper classes
  • add Event.getRow() and Row.name
  • expose domain changes, bound changes, branching decisions, added constraints for nodes
  • define Python object identity based on underlying SCIP object pointers, so that e.g. rows and columns can be added to sets, and testing for equality is consistent over time.
  • add Row.isRemovable and Row.getOrigintype
  • add Model.applyCutsProbing and Model.propagateProbing
  • add Model.separateSol
  • add methods to work with nonlinear rows
  • adds new "threadsafe" parameter to the PyBendersCopy member function. Also, the "threadsafe" parameter can be passed when creating a Model instance
  • adds the boolean return options of "infeasible" and "auxviol" to the Benders.benderspresubsolve function. "infeasible" indicates that the input solution induces an infeasible instance of at least one Benders' subproblems. "auxviol" indicates that the objective value of at least on Benders' subproblem is greater than the auxiliary variable value.
  • adds chgVarUbProbing and chgVarLbProbing to change a variables upper or lower bound during probing mode.

Changed

  • Node.getParent() returns None if the node has no parent
  • remove Python 2.7 support
  • fix documentation errors
  • setupBendersSubproblem now requires a checktype input. This input indicates the reason for solving the Benders' subproblems, either enforcing the LP, relaxation or pseudo solution (LP, RELAX or PSEUDO) or checking a candidate primal feasible solution (CHECK).

2.2.3 - 2019-12-10

Added

  • expose even more SCIP functionality in scip.pxd

Changed

  • move the main Python class declarations into scip.pxd; this makes it possible to write custom pyx extensions.

2.2.2 - 2019-11-27

Added

  • support for node selector plugin
  • getOpenNodes() to access all open nodes

Changed

  • new Benders functionality

2.2.1 - 2019-09-17

Added

  • evaluate polynomial expressions using the given solution values

2.2.0 - 2019-08-28

Added

  • convenient access to solution data, via solution[x] syntax instead of model.getVal(x)
  • store Variable objects in Model for faster access

Removed

  • releaseVar(): potentially harmful and not necessary anymore

2.1.9 - 2019-08-20

Changed

  • recommend pip install . over python setup.py install in INSTALL

2.1.8 - 2019-08-19

Added

  • lpiGetIterations() to get LP iterations of last solved LP relaxation

Changed

  • rework setup.py to support developer versions of SCIP libraries built with Makefiles

2.1.7 - 2019-08-09

Fixed

  • fix methods to get and set char and string parameters