ILOG CPLEX C++ API 9.0 Reference Manual

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IloCplex::NodeEvaluatorI IloCplex::NodeEvaluatorI Category Inner Class InheritancePath Definition File Include Files ilocplexi.h ilcplex/ilocplex.h public Constructor Summary NodeEvaluatorI() public virtual NodeEvaluatorI * public virtual IloNum protected IloNumVar protected IloNum protected IloNum protected IloNum protected IloInt protected NodeId protected IloNum public virtual void public virtual IloBool Method Summary duplicateEvaluator() evaluate() getBranchVar() getDepth() getEstimatedObjValue() getInfeasibilitySum() getNinfeasibilities() getNodeId() getObjValue() init() subsume(IloNum, IloNum) Description IloCplex::NodeEvaluatorI is the base class for implementing node evaluators. Node evaluators allow you to control the node selection strategy for a subtree by assigning values to the nodes. By default, IloCplex selects the node with the lowest value when choosing the next node to process during branch & cut search. This behavior can be altered by overwriting method subsume. ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 194
IloCplex::NodeEvaluatorI To implement your own node evaluator, you need to create a subclass of IloCplex::NodeEvaluatorI and implement methods evaluate and duplicateEvaluator. The method evaluate must be implemented to compute and return a value for a given node. The protected methods of class IloCplex::NodeEvaluatorI can be called to query information about the node in order to compute this value. Each node is evaluated only once, after which the value is attached to the node until the node is processed or pruned. The duplicateEvaluator method is called by IloCplex when a copy of the evaluator must be created for use in parallel branch & cut search. Thus the implementation must simply create and return a copy of the evaluator itself—calling the copy constructor will work in most circumstances. Node evaluators are applied to a search defined by a goal with the method IloCplex::Apply. The node selection strategy will be applied only to the subtree defined by the goal passed to Apply. Using IloCplex::Apply, you can assign different node selection strategies to different subtrees. You can also assign multiple node selection strategies to subtrees. In this case, node selection strategies applied first have precedence over those assigned later. If no node evaluators are added, IloCplex uses the node selection strategy as controlled by the NodeSel parameter. See Also Constructors Methods IloCplex, IloCplex::NodeEvaluator public NodeEvaluatorI() This constructor creates a node selector for use in an application with a user-defined node selection strategy to solve a MIP. public virtual NodeEvaluatorI * duplicateEvaluator() This method must be implemented by the user to return a copy of the invoking object. It is called internally to duplicate the current node evaluator for parallel branch & cut search. This method is not called for a particular node, so the get methods cannot be used. public virtual IloNum evaluate() This method must be implemented by the user to return a value for a given node. When this method is called, the node evaluator is initialized to the node for which to compute the value. Information about this node can be obtained by the get methods of IloCplex::NodeEvaluatorI. Returning IloInfinity instructs IloCplex to discard the node being evaluated. protected IloNumVar getBranchVar() This method returns the variable that IloCplex branched on when creating the node being evaluated from its parent. If the node has been generated with a more complex ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 195
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ILOG CPLEX C++ API 9.0 Reference Ma
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T ABLE OF C ONTENTS IloCplex::Branc
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About This Manual This reference ma
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Concepts Branch & Cut IloCplex, lik
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It is possible to tell IloCplex to
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Group optim.cplex.cpp The API of IL
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IloCplex::Algorithm IloCplex::Basis
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ILOFLOAT, for continuous, ILOINT, f
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ILOBARRIERCALLBACK0 ILOBARRIERCALLB
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ILOCONTINUOUSCALLBACK0 ILOCONTINUOU
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ILOCPLEXGOAL0 } return 0; This macr
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ILOCUTCALLBACK0 ILOCUTCALLBACK0 Cat
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ILOFRACTIONALCUTCALLBACK0 ILOFRACTI
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ILOINCUMBENTCALLBACK0 ILOINCUMBENTC
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ILOMIPCALLBACK0 ILOMIPCALLBACK0 Cat
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ILONODECALLBACK0 ILONODECALLBACK0 C
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ILOPROBINGCALLBACK0 ILOPROBINGCALLB
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ILOSOLVECALLBACK0 ILOSOLVECALLBACK0
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IloCplex IloCplex Category Class In
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IloCplex public IloCplex::CplexStat
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IloCplex public void public void pu
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IloCplex IloCplex::NodeSelect IloCp
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IloCplex Mathematical Programming m
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IloCplex IloCplex effectively treat
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IloCplex classes that allow the use
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IloCplex When IloCplex is not divin
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IloCplex public const IloConstraint
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IloCplex This method deletes all la
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IloCplex to use for the constraint
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IloCplex public IloCplex::CplexStat
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IloCplex Note:CPLEX resizes these a
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IloCplex This method returns the nu
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IloCplex public IloCplex::PWLFormul
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IloCplex public void getValues(cons
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IloCplex This method creates and re
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IloCplex This method sets the prefe
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IloCplex its subgoals. See the conc
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IloCplex::Algorithm IloCplex::Algor
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IloCplex::BarrierCallbackI IloCplex
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IloCplex::BasisStatus IloCplex::Bas
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IloCplex::BoolParam IloCplex::BoolP
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IloCplex::BranchCallbackI IloCplex:
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IloCplex::BranchCallbackI ControlCa
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IloCplex::BranchCallbackI IloCplex:
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IloCplex::BranchCallbackI NodeData
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IloCplex::BranchCallbackI no branch
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IloCplex::BranchDirection IloCplex:
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IloCplex::Callback IloCplex::Callba
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IloCplex::CallbackI IloCplex::Callb
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IloCplex::CallbackI callbacks can a
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Callback::Type Callback::Type Categ
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IloCplex::ContinuousCallbackI Descr
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IloCplex::ControlCallbackI IloCplex
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IloCplex::ControlCallbackI MIPCallb
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IloCplex::ControlCallbackI This met
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IloCplex::ControlCallbackI For each
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ControlCallbackI::IntegerFeasibilit
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IloCplex::CplexStatus See also the
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IloCplex::CrossoverCallbackI IloCpl
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IloCplex::CutCallbackI IloCplex::Cu
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IloCplex::CutCallbackI from a user-
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IloCplex::DisjunctiveCutCallbackI I
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IloCplex::DualPricing IloCplex::Dua
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IloCplex::FlowMIRCutCallbackI IloCp
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IloCplex::FractionalCutCallbackI Il
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IloCplex::Goal IloCplex::Goal Categ
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IloCplex::GoalI IloCplex::GoalI Cat
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IloCplex::GoalI public IloInt publi
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IloCplex::GoalI Methods public void
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IloCplex::GoalI Returns the solutio
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IloCplex::GoalI const IloNumVarArra
Page 144 and 145: IloCplex::GoalI Returns the branch
Page 146 and 147: IloCplex::GoalI public IloBool isIn
Page 148 and 149: GoalI::BranchType GoalI::BranchType
Page 150 and 151: GoalI::IntegerFeasibilityArray Goal
Page 152 and 153: IloCplex::HeuristicCallbackI protec
Page 154 and 155: IloCplex::HeuristicCallbackI protec
Page 156 and 157: IloCplex::HeuristicCallbackI The pa
Page 158 and 159: IloCplex::IISStatusArray IloCplex::
Page 160 and 161: IloCplex::IncumbentCallbackI MIPCal
Page 162 and 163: IloCplex::IntParam IloCplex::IntPar
Page 164 and 165: IloCplex::IntParam See the referenc
Page 166 and 167: IloCplex::IntParam = CPX_PARAM_COLR
Page 168 and 169: IloCplex::IntParam = CPX_PARAM_FRAC
Page 170 and 171: IloCplex::InvalidCutException IloCp
Page 172 and 173: IloCplex::LazyConstraintCallbackI M
Page 174 and 175: IloCplex::MIPCallbackI protected Il
Page 176 and 177: IloCplex::MIPCallbackI IloCplex::No
Page 178 and 179: IloCplex::MIPCallbackI Returns the
Page 180 and 181: MIPCallbackI::NodeData MIPCallbackI
Page 182 and 183: IloCplex::MIPEmphasisType = CPX_MIP
Page 184 and 185: IloCplex::MultipleObjException IloC
Page 186 and 187: IloCplex::NetworkCallbackI The meth
Page 188 and 189: IloCplex::NodeCallbackI protected v
Page 190 and 191: IloCplex::NodeCallbackI protected I
Page 192 and 193: IloCplex::NodeEvaluator IloCplex::N
Page 196 and 197: IloCplex::NodeEvaluatorI branch, 0
Page 198 and 199: IloCplex::NodeSelect IloCplex::Node
Page 200 and 201: IloCplex::NumParam = CPX_PARAM_EPOP
Page 202 and 203: IloCplex::PWLFormulation IloCplex::
Page 204 and 205: IloCplex::PresolveCallbackI model,
Page 206 and 207: IloCplex::ProbingCallbackI IloCplex
Page 208 and 209: IloCplex::ProbingCallbackI This met
Page 210 and 211: IloCplex::Quality Primalobj, Primal
Page 212 and 213: IloCplex::Quality = CPX_SUM_X SumSc
Page 214 and 215: IloCplex::SearchLimit The default c
Page 216 and 217: IloCplex::SearchLimitI creates a go
Page 218 and 219: IloCplex::SimplexCallbackI ILOG CPL
Page 220 and 221: IloCplex::SolveCallbackI Inherited
Page 222 and 223: IloCplex::SolveCallbackI const IloN
Page 224 and 225: IloCplex::UnknownExtractableExcepti
Page 226 and 227: IloCplex::UserCutCallbackI MIPCallb
Page 228 and 229: IloCplex::VariableSelect Group opti
Page 230 and 231: IloCplex::PWLFormulation IloCplex::
Page 232 and 233: IloCplex::PWLFormulation Descriptio
Page 234 and 235: IloCplex::LazyConstraintCallbackI I
Page 236 and 237: IloCplex::UserCutCallbackI Inherite
Page 238: I NDEX ILOFRACTIONALCUTCALLBACK0 26
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ILOG CPLEX C++ API 9.0 Reference Manual

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