MPL for Windows Manual

Change CPLEX MIP Cuts Options

You can change the MIP cuts options for CPLEX by choosing CPLEX parameters from the Options menu and then pressing the MIP Cuts tab. This will display the MIP cuts options for CPLEX in the dialog box as shown below:

Clique Cuts

Determines whether or not to generate clique cuts for the problem and how aggressively.

Do not generate cuts      Do not generate clique cuts.

Automatic                 Generate clique cuts only if it seems to
                          be helping.(default)

Moderately	          Generate clique cuts moderately.

Aggressively	          Generate clique cuts aggressively.

Cover Cuts

Determines whether or not to generate cover cuts for the problem and how aggressively.

Do not generate cuts	Do not generate cover cuts.

Automatic		Generate Cover cuts only if
			it seems to be helping (default).

Moderately	        Generate cover cuts moderately.

Aggressively	        Generate cover cuts aggressively.

GUB Cuts

Determines whether or not to generate GUB cuts for the problem and how aggressively.

Do not generate cuts	Do not generate GUB cuts.

Automatic		Generate GUB cuts only if
			it seems to be helping (default).

Moderatley	        Generate GUB cuts moderately.

Aggressively	        Generate GUB cuts aggressively.

MIR cuts

Determines whether or not mixed integer rounding (MIR) cuts should be generated for the problem and how aggressively.

Do not generate cuts	Do not generate MIR cuts.

Automatic	        Generate MIR cuts only if 
                        it seems to be helping (default).
							
Moderately	        Generate MIR cuts moderately.

Aggressively	        Generate MIR cuts aggressively.

Implied bound Cuts

Determines whether or not to generate implied bound cuts for the problem and how aggressively.

Do not generate cuts	Do not generate bound cuts.

Automatic		Generate bound should continue only if
			it seems to be helping (default).

Moderately	        Generate implied bound cuts moderately.

Aggressively 	        Generate implied bound cuts aggressively.

Flow path cuts

Determines whether or not to generate flow path cuts for the problem and how aggressively.

Do not generate cuts	Do not generate flow path cuts.

Automatic	        Generate flow path cuts only if 
                        it seems to be helping (default).
					   
Moderately	        Generate flow path cuts moderately.

Aggressively	        Generate flow path cuts aggressively.

Disjunctive cuts

Determines whether or not to generate disjunctive cuts for the problem and how aggressively.

Do not generate cuts	Do not generate disjunctive cuts.

Automatic	        Generate disjunctive cuts only if 
                        it seems to be helping (default).

Moderately	        Generate disjunctive cuts moderately.

Aggressively 	        Generate disjunctive cuts aggressively.

Very Aggressively 	Generate disjunctive cuts very aggressively.

Gomory fractional Cuts

Determines whether or not to generate gomory fractional cuts for the problem and how aggressively.

Do not generate cuts	Do not generate gomory fractional cuts.

Automatic		Generate gomory fractional cuts only if 
                        it seems to be helping(default).

Moderate	        For models requiring some fine tuning of performance.

Aggressive	        For models requiring some fine tuning of performance.

Cutting plane passes limit

Sets the upper limit on the number of passes CPLEX performs when generating cutting planes on a MIP model. Positive values give number of passes to perform. And zero means Automatic (default).

Constraint aggregation limit

Limits the number of constraints that can be aggregated for generating flow cover and mixed integer rounding cuts. For most purposes the default of 3 will be satisfactory.

Row multiplier factor for cuts

Limits the number of cuts that can be added. The number of rows in the problem with cuts added is limited to this factor value times the original number of rows. If the problem is presolved, the original number of rows is that from the presolved problem. A factor of 1.0 o less means that no cuts will be generated. Because cuts can be added and removed during the course of optimization, factor may not correspond directly to the number of cuts seen during the node log or in the summary table at the end of optimization.

Gomory passes limit

Limits the number of passes for generating Gomory fractional cuts. At the default setting of 0, CPLEX decides. The parameter is ignored if the Gomory fractional cut parameter is is set to a nonzero value.

Gomory candidate limit

Limits the number of candidate variables for generating Gomory fractional cuts. The default is 200.