absolute gap for solution pool

Sets an absolute tolerance on the objective value for the solutions in the solution pool.

Purpose

Absolute gap for solution pool

API	Parameter Name	Name prior to V12.6.0
C	CPXPARAM_MIP_Pool_AbsGap	CPX_PARAM_SOLNPOOLAGAP
C++	IloCplex::Param::MIP::Pool::AbsGap	SolnPoolAGap (double)
Java	IloCplex.Param.MIP.Pool.AbsGap	SolnPoolAGap (double)
.NET	Cplex.Param.MIP.Pool.AbsGap	SolnPoolAGap (double)
OPL	solnpoolagap	solnpoolagap
Python	parameters.mip.pool.absgap	mip.pool.absgap
Interactive	mip pool absgap	mip pool absgap
Identifier	2106	2106

Description

Sets an absolute tolerance on the objective value for the solutions in the solution pool. Solutions that are worse (either greater in the case of a minimization, or less in the case of a maximization) than the objective of the incumbent solution according to this measure are not kept in the solution pool.

Values of the solution pool absolute gap (SolnPoolAGap or CPX_PARAM_SOLNPOOLAGAP) and the solution pool relative gap (relative gap for solution pool: SolnPoolGap or CPX_PARAM_SOLNPOOLGAP) may differ: For example, you may specify that solutions must be within 15 units by means of the solution pool absolute gap and also within 1% of the incumbent by means of the solution pool relative gap. A solution is accepted in the pool only if it is valid for both the relative and the absolute gaps.

The solution pool absolute gap parameter can also be used as a stopping criterion for the populate procedure: if populate cannot enumerate any more solutions that satisfy this objective quality, then it will stop. In the presence of both an absolute and a relative solution pool gap parameter, populate will stop when the smaller of the two is reached.

Values

Any nonnegative real number; default: 1.0e+75.