Interface changes between SCIP 4.0 and SCIP 5.0

New and changed callbacks

• New types:
  • added new abstract selection algorithm SCIP_BANDIT together with callbacks
  • added new type SCIP_TABLE together with callbacks to output SCIP statistics
  • added new types for symmetry handling
• Separation callbacks:
  • added parameter "allowlocal" to SCIP_DECL_SEPAEXECLP and SCIP_DECL_SEPAEXECSOL
• NLP callbacks
  • added parameter "dstatssize" to SCIP_DECL_NLPIDELVARSET and SCIP_DECL_NLPIDELCONSSET
  • added parameter "objval" to SCIP_DECL_NLPIGETSOLUTION

Changed interface methods

• Cutting plane separation methods:
  • changed function signature of SCIPcalcMIR()
  • changed function signature of SCIPcalcStrongCG()
  • added parameter "allowlocal" to SCIPseparateSol()
  • new method SCIPaddRow() to replace deprecated SCIPaddCut()
  • removed parameter "scaling" from SCIPgetRowprepViolation()

• Relaxator methods:
  • removed parameter "includeslp" from SCIPincludeRelax()
  • added parameter "includeslp" to SCIPmarkRelaxSolValid(), SCIPsetRelaxSolVals(), and SCIPsetRelaxSolValsSol()
  • removed functions SCIPrelaxIncludesLp() and SCIPrelaxSetIncludesLp()
  • replaced method SCIPgetRelaxFeastolFactor() by SCIPrelaxfeastol() and added SCIPchgRelaxfeastol()

• LP interface:
  • replaced LP parameters SCIP_LPPARAM_LOBJLIM and SCIP_LPPARAM_UOBJLIM by SCIP_LPPARAM_OBJLIM

• Branching rules:
  • removed parameter "allowaddcons" from SCIPselectVarPseudoStrongBranching(), SCIPselectVarStrongBranching(), and SCIPincludeBranchruleRelpscost()

• Primal heuristics:
  • SCIPheurPassIndicator() has a new parameter which allows to pass the objective of the solution

• Constraint Handlers:
  • generalized SCIPcreateConsOrbitope() and SCIPcreateConsBasicOrbitope() method to three orbitope types (full, partitioning, packing)

• NLP interface:
  • added argument "dstatssize" to SCIPnlpiDelVarSet() and SCIPnlpiDelConsSet()
  • added modifier const to "exprtree" argument of SCIPnlpiChgExprtree()
  • added parameter "objval" to SCIPnlpiGetSolution()
  • added argument "varnameslength" to SCIPexprParse()
  • dropped NLP termination status "SCIP_NLPTERMSTAT_UOBJLIM"
  • SCIPnlpStatisticsCreate() and SCIPnlpStatisticsFree() now require a pointer to the block memory as argument

• Data structures:
  • methods SCIPrandomCreate() and SCIPrandomFree() are no longer public and should be replaced by SCIPcreateRandom() and SCIPfreeRandom(), respectively (the new methods respect the global parameter "randomization/randomseedshift" automatically)
  • methods SCIPdigraphCreate() and SCIPdigraphCopy() are no longer public and should be replaced by SCIPcreateDigraph() and SCIPcopyDigraph(), respectively, which receive a SCIP argument and are more robust towards future interface changes

• Misc:
  • added parameter "copytables" to SCIPcopyPlugins()
  • allowed SCIPgetNConss() in stage SCIP_STAGE_INITSOLVE
  • SCIPsolveParallel() is deprecated; use SCIPsolveConcurrent() instead
  • changed return type of SCIPcliqueGetId() from "int" to "unsigned int"
  • removed SCIPvarGetCliqueComponentIdx(); the connectedness information of the clique table is now stored as a SCIP_DISJOINTSET member of the clique table and cannot be publicly accessed

Changed parameters

• fixed typo: "heuristics/completesol/maxunkownrate" has changed to "heuristics/completesol/maxunknownrate"
• removed parameters "constraints/{abspower,bivariate,nonlinear,quadratic,soc}/scaling"
• replaced "constraints/quadratic/disaggregate" by "constraints/quadratic/maxdisaggrsize" to bound the total number of created constraints when disaggregating a quadratic constraint
• removed parameters "constraints/{abspower,bivariate,quadratic,nonlinear}/mincutefficacysepa", "constraints/{abspower,bivariate,quadratic,nonlinear}/mincutefficacyenfofac", and "constraints/soc/minefficacy"
• removed parameters "conflict/usemir" and "conflict/prefermir"
• removed parameter "separating/feastolfac"
• removed parameter "separating/orthofac"
• parameter "separating/maxstallrounds" only applies to nodes in the tree (not the root node, anymore); use the new parameter "separating/maxstallroundsroot" for the root node
• removed parameters "heuristics/clique/{multiplier,initseed}"
• replaced parameter "heuristics/{clique,vbounds}/minfixingrate" by "heuristics/{clique,vbounds}/minintfixingrate" and "heuristics/{clique,vbounds}/minmipfixingrate", which check the fixing rate before LP solving and after sub-MIP presolve
• removed parameter "separating/cgmip/allowlocal" (use parameter passed to separation callback instead)
• removed parameter "separating/{gomory,strongcg}/maxweightrange"
• changed and removed several parameters for zerohalf separator
• moved parameters for flowcover and cmir separators to "separating/aggregation"

For further information we refer to the Release notes and the Changelog.